| Message ID | 20200512204147.504087-3-martin.blumenstingl@googlemail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Amlogic 32-bit Meson SoC SDHC MMC controller driver | expand |
On Tue, 12 May 2020 at 22:42, Martin Blumenstingl <martin.blumenstingl@googlemail.com> wrote: > > The SDHC MMC host controller on Amlogic SoCs provides an eMMC and MMC > card interface with 1/4/8-bit bus width. > It supports eMMC spec 4.4x/4.5x including HS200 (up to 100MHz clock). > > The public S805 datasheet [0] contains a short documentation about the > registers. Unfortunately it does not describe how to use the registers > to make the hardware work. Thus this driver is based on reading (and > understanding) the Amlogic 3.10 GPL kernel code. > > Some hardware details are not easy to see. Jianxin Pan was kind enough > to answer my questions: > The hardware has built-in busy timeout support. The maximum timeout is > 30 seconds. This is only documented in Amlogic's internal > documentation. > > The controller only works with very specific clock configurations. The > details are not part of the public datasheet. In my own words the > supported configurations are: > - 399.812kHz: clkin = 850MHz div = 2126 sd_rx_phase = 63 > - 1MHz: clkin = 850MHz div = 850 sd_rx_phase = 55 > - 5.986MHz: clkin = 850MHz div = 142 sd_rx_phase = 24 > - 25MHz: clkin = 850MHz div = 34 sd_rx_phase = 15 > - 47.222MHz: clkin = 850MHz div = 18 sd_rx_phase = 11/15 (SDR50/HS) > - 53.125MHz: clkin = 850MHz div = 16 sd_rx_phase = (tuning) > - 70.833MHz: clkin = 850MHz div = 12 sd_rx_phase = (tuning) > - 85MHz: clkin = 850MHz div = 10 sd_rx_phase = (tuning) > - 94.44MHz: clkin = 850MHz div = 9 sd_rx_phase = (tuning) > - 106.25MHz: clkin = 850MHz div = 8 sd_rx_phase = (tuning) > - 127.5MHz: clkin = 1275MHz div = 10 sd_rx_phase = (tuning) > - 141.667MHz: clkin = 850MHz div = 6 sd_rx_phase = (tuning) > - 159.375MHz: clkin = 1275MHz div = 8 sd_rx_phase = (tuning) > - 212.5MHz: clkin = 1275MHz div = 6 sd_rx_phase = (tuning) > - (sd_tx_phase is always 1, 94.44MHz is not listed in the datasheet > but this is what the 3.10 BSP kernel on Odroid-C1 actually uses) > > NOTE: CMD23 support is disabled for now because it results in command > timeouts and thus decreases read performance. > > Tested-by: Wei Wang <lnykww@gmail.com> > Tested-by: Xin Yin <yinxin_1989@aliyun.com> > Reviewed-by: Xin Yin <yinxin_1989@aliyun.com> > Tested-by: Anand Moon <linux.amoon@gmail.com> > Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> This looks good to me, however I am awaiting a reviewed-by tag from Jerome, to make sure the clock implementation turn out as agreed upon. Kind regards Uffe > --- > drivers/mmc/host/Kconfig | 14 + > drivers/mmc/host/Makefile | 1 + > drivers/mmc/host/meson-mx-sdhc-clkc.c | 158 +++++ > drivers/mmc/host/meson-mx-sdhc.c | 907 ++++++++++++++++++++++++++ > drivers/mmc/host/meson-mx-sdhc.h | 141 ++++ > 5 files changed, 1221 insertions(+) > create mode 100644 drivers/mmc/host/meson-mx-sdhc-clkc.c > create mode 100644 drivers/mmc/host/meson-mx-sdhc.c > create mode 100644 drivers/mmc/host/meson-mx-sdhc.h > > diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig > index 462b5352fea7..df3fc572f842 100644 > --- a/drivers/mmc/host/Kconfig > +++ b/drivers/mmc/host/Kconfig > @@ -405,6 +405,20 @@ config MMC_MESON_GX > > If you have a controller with this interface, say Y here. > > +config MMC_MESON_MX_SDHC > + tristate "Amlogic Meson SDHC Host Controller support" > + depends on (ARM && ARCH_MESON) || COMPILE_TEST > + depends on COMMON_CLK > + depends on OF > + help > + This selects support for the SDHC Host Controller on > + Amlogic Meson6, Meson8, Meson8b and Meson8m2 SoCs. > + The controller supports the SD/SDIO Spec 3.x and eMMC Spec 4.5x > + with 1, 4, and 8 bit bus widths. > + > + If you have a controller with this interface, say Y or M here. > + If unsure, say N. > + > config MMC_MESON_MX_SDIO > tristate "Amlogic Meson6/Meson8/Meson8b SD/MMC Host Controller support" > depends on ARCH_MESON || COMPILE_TEST > diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile > index b929ef941208..8bcb420e071c 100644 > --- a/drivers/mmc/host/Makefile > +++ b/drivers/mmc/host/Makefile > @@ -68,6 +68,7 @@ obj-$(CONFIG_MMC_VUB300) += vub300.o > obj-$(CONFIG_MMC_USHC) += ushc.o > obj-$(CONFIG_MMC_WMT) += wmt-sdmmc.o > obj-$(CONFIG_MMC_MESON_GX) += meson-gx-mmc.o > +obj-$(CONFIG_MMC_MESON_MX_SDHC) += meson-mx-sdhc-clkc.o meson-mx-sdhc.o > obj-$(CONFIG_MMC_MESON_MX_SDIO) += meson-mx-sdio.o > obj-$(CONFIG_MMC_MOXART) += moxart-mmc.o > obj-$(CONFIG_MMC_SUNXI) += sunxi-mmc.o > diff --git a/drivers/mmc/host/meson-mx-sdhc-clkc.c b/drivers/mmc/host/meson-mx-sdhc-clkc.c > new file mode 100644 > index 000000000000..ab0d6c68a078 > --- /dev/null > +++ b/drivers/mmc/host/meson-mx-sdhc-clkc.c > @@ -0,0 +1,158 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Amlogic Meson SDHC clock controller > + * > + * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com> > + */ > + > +#include <linux/clk.h> > +#include <linux/clk-provider.h> > +#include <linux/device.h> > +#include <linux/platform_device.h> > + > +#include "meson-mx-sdhc.h" > + > +#define MESON_SDHC_NUM_BUILTIN_CLKS 6 > + > +struct meson_mx_sdhc_clkc { > + struct clk_mux src_sel; > + struct clk_divider div; > + struct clk_gate mod_clk_en; > + struct clk_gate tx_clk_en; > + struct clk_gate rx_clk_en; > + struct clk_gate sd_clk_en; > +}; > + > +static const struct clk_parent_data meson_mx_sdhc_src_sel_parents[4] = { > + { .fw_name = "clkin0" }, > + { .fw_name = "clkin1" }, > + { .fw_name = "clkin2" }, > + { .fw_name = "clkin3" }, > +}; > + > +static const struct clk_div_table meson_mx_sdhc_div_table[] = { > + { .div = 6, .val = 5, }, > + { .div = 8, .val = 7, }, > + { .div = 9, .val = 8, }, > + { .div = 10, .val = 9, }, > + { .div = 12, .val = 11, }, > + { .div = 16, .val = 15, }, > + { .div = 18, .val = 17, }, > + { .div = 34, .val = 33, }, > + { .div = 142, .val = 141, }, > + { .div = 850, .val = 849, }, > + { .div = 2126, .val = 2125, }, > + { .div = 4096, .val = 4095, }, > + { /* sentinel */ } > +}; > + > +static int meson_mx_sdhc_clk_hw_register(struct device *dev, > + const char *name_suffix, > + const struct clk_parent_data *parents, > + unsigned int num_parents, > + const struct clk_ops *ops, > + struct clk_hw *hw) > +{ > + struct clk_init_data init = { 0 }; > + char clk_name[32]; > + > + snprintf(clk_name, sizeof(clk_name), "%s#%s", dev_name(dev), > + name_suffix); > + > + init.name = clk_name; > + init.ops = ops; > + init.flags = CLK_SET_RATE_PARENT; > + init.parent_data = parents; > + init.num_parents = num_parents; > + > + hw->init = &init; > + > + return devm_clk_hw_register(dev, hw); > +} > + > +static int meson_mx_sdhc_gate_clk_hw_register(struct device *dev, > + const char *name_suffix, > + struct clk_hw *parent, > + struct clk_hw *hw) > +{ > + struct clk_parent_data parent_data = { .hw = parent }; > + > + return meson_mx_sdhc_clk_hw_register(dev, name_suffix, &parent_data, 1, > + &clk_gate_ops, hw); > +} > + > +int meson_mx_sdhc_register_clkc(struct device *dev, void __iomem *base, > + struct clk_bulk_data *clk_bulk_data) > +{ > + struct clk_parent_data div_parent = { 0 }; > + struct meson_mx_sdhc_clkc *clkc_data; > + int ret; > + > + clkc_data = devm_kzalloc(dev, sizeof(*clkc_data), GFP_KERNEL); > + if (!clkc_data) > + return -ENOMEM; > + > + clkc_data->src_sel.reg = base + MESON_SDHC_CLKC; > + clkc_data->src_sel.mask = 0x3; > + clkc_data->src_sel.shift = 16; > + ret = meson_mx_sdhc_clk_hw_register(dev, "src_sel", > + meson_mx_sdhc_src_sel_parents, 4, > + &clk_mux_ops, > + &clkc_data->src_sel.hw); > + if (ret) > + return ret; > + > + clkc_data->div.reg = base + MESON_SDHC_CLKC; > + clkc_data->div.shift = 0; > + clkc_data->div.width = 12; > + clkc_data->div.table = meson_mx_sdhc_div_table; > + div_parent.hw = &clkc_data->src_sel.hw; > + ret = meson_mx_sdhc_clk_hw_register(dev, "div", &div_parent, 1, > + &clk_divider_ops, > + &clkc_data->div.hw); > + if (ret) > + return ret; > + > + clkc_data->mod_clk_en.reg = base + MESON_SDHC_CLKC; > + clkc_data->mod_clk_en.bit_idx = 15; > + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "mod_clk_on", > + &clkc_data->div.hw, > + &clkc_data->mod_clk_en.hw); > + if (ret) > + return ret; > + > + clkc_data->tx_clk_en.reg = base + MESON_SDHC_CLKC; > + clkc_data->tx_clk_en.bit_idx = 14; > + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "tx_clk_on", > + &clkc_data->div.hw, > + &clkc_data->tx_clk_en.hw); > + if (ret) > + return ret; > + > + clkc_data->rx_clk_en.reg = base + MESON_SDHC_CLKC; > + clkc_data->rx_clk_en.bit_idx = 13; > + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "rx_clk_on", > + &clkc_data->div.hw, > + &clkc_data->rx_clk_en.hw); > + if (ret) > + return ret; > + > + clkc_data->sd_clk_en.reg = base + MESON_SDHC_CLKC; > + clkc_data->sd_clk_en.bit_idx = 12; > + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "sd_clk_on", > + &clkc_data->div.hw, > + &clkc_data->sd_clk_en.hw); > + if (ret) > + return ret; > + > + /* > + * TODO: Replace clk_hw.clk with devm_clk_hw_get_clk() once that is > + * available. > + */ > + clk_bulk_data[0].clk = clkc_data->mod_clk_en.hw.clk; > + clk_bulk_data[1].clk = clkc_data->sd_clk_en.hw.clk; > + clk_bulk_data[2].clk = clkc_data->tx_clk_en.hw.clk; > + clk_bulk_data[3].clk = clkc_data->rx_clk_en.hw.clk; > + > + return 0; > +} > diff --git a/drivers/mmc/host/meson-mx-sdhc.c b/drivers/mmc/host/meson-mx-sdhc.c > new file mode 100644 > index 000000000000..5c00958d7754 > --- /dev/null > +++ b/drivers/mmc/host/meson-mx-sdhc.c > @@ -0,0 +1,907 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Amlogic Meson6/Meson8/Meson8b/Meson8m2 SDHC MMC host controller driver. > + * > + * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com> > + */ > + > +#include <linux/clk.h> > +#include <linux/device.h> > +#include <linux/dma-mapping.h> > +#include <linux/interrupt.h> > +#include <linux/iopoll.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/property.h> > +#include <linux/regmap.h> > +#include <linux/regulator/consumer.h> > +#include <linux/types.h> > + > +#include <linux/mmc/host.h> > +#include <linux/mmc/mmc.h> > +#include <linux/mmc/sdio.h> > +#include <linux/mmc/slot-gpio.h> > + > +#include "meson-mx-sdhc.h" > + > +#define MESON_SDHC_NUM_BULK_CLKS 4 > +#define MESON_SDHC_MAX_BLK_SIZE 512 > +#define MESON_SDHC_NUM_TUNING_TRIES 10 > + > +#define MESON_SDHC_WAIT_CMD_READY_SLEEP_US 1 > +#define MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US 100000 > +#define MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US 1 > +#define MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US 200 > + > +struct meson_mx_sdhc_data { > + void (*init_hw)(struct mmc_host *mmc); > + void (*set_pdma)(struct mmc_host *mmc); > + void (*wait_before_send)(struct mmc_host *mmc); > + bool hardware_flush_all_cmds; > +}; > + > +struct meson_mx_sdhc_host { > + struct mmc_host *mmc; > + > + struct mmc_request *mrq; > + struct mmc_command *cmd; > + int error; > + > + struct regmap *regmap; > + > + struct clk *pclk; > + struct clk *sd_clk; > + struct clk_bulk_data bulk_clks[MESON_SDHC_NUM_BULK_CLKS]; > + bool bulk_clks_enabled; > + > + const struct meson_mx_sdhc_data *platform; > +}; > + > +static const struct regmap_config meson_mx_sdhc_regmap_config = { > + .reg_bits = 8, > + .val_bits = 32, > + .reg_stride = 4, > + .max_register = MESON_SDHC_CLK2, > +}; > + > +static void meson_mx_sdhc_hw_reset(struct mmc_host *mmc) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + > + regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_MAIN_CTRL | > + MESON_SDHC_SRST_RXFIFO | MESON_SDHC_SRST_TXFIFO | > + MESON_SDHC_SRST_DPHY_RX | MESON_SDHC_SRST_DPHY_TX | > + MESON_SDHC_SRST_DMA_IF); > + usleep_range(10, 100); > + > + regmap_write(host->regmap, MESON_SDHC_SRST, 0); > + usleep_range(10, 100); > +} > + > +static void meson_mx_sdhc_clear_fifo(struct mmc_host *mmc) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + u32 stat; > + > + regmap_read(host->regmap, MESON_SDHC_STAT, &stat); > + if (!FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) && > + !FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat)) > + return; > + > + regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_RXFIFO | > + MESON_SDHC_SRST_TXFIFO | MESON_SDHC_SRST_MAIN_CTRL); > + udelay(5); > + > + regmap_read(host->regmap, MESON_SDHC_STAT, &stat); > + if (FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) || > + FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat)) > + dev_warn(mmc_dev(host->mmc), > + "Failed to clear FIFOs, RX: %lu, TX: %lu\n", > + FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat), > + FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat)); > +} > + > +static void meson_mx_sdhc_wait_cmd_ready(struct mmc_host *mmc) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + u32 stat, esta; > + int ret; > + > + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT, stat, > + !(stat & MESON_SDHC_STAT_CMD_BUSY), > + MESON_SDHC_WAIT_CMD_READY_SLEEP_US, > + MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US); > + if (ret) { > + dev_warn(mmc_dev(mmc), > + "Failed to poll for CMD_BUSY while processing CMD%d\n", > + host->cmd->opcode); > + meson_mx_sdhc_hw_reset(mmc); > + } > + > + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, esta, > + !(esta & MESON_SDHC_ESTA_11_13), > + MESON_SDHC_WAIT_CMD_READY_SLEEP_US, > + MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US); > + if (ret) { > + dev_warn(mmc_dev(mmc), > + "Failed to poll for ESTA[13:11] while processing CMD%d\n", > + host->cmd->opcode); > + meson_mx_sdhc_hw_reset(mmc); > + } > +} > + > +static void meson_mx_sdhc_start_cmd(struct mmc_host *mmc, > + struct mmc_command *cmd) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + u32 ictl, send; > + int pack_len; > + > + host->cmd = cmd; > + > + ictl = MESON_SDHC_ICTL_DATA_TIMEOUT | MESON_SDHC_ICTL_DATA_ERR_CRC | > + MESON_SDHC_ICTL_RXFIFO_FULL | MESON_SDHC_ICTL_TXFIFO_EMPTY | > + MESON_SDHC_ICTL_RESP_TIMEOUT | MESON_SDHC_ICTL_RESP_ERR_CRC; > + > + send = FIELD_PREP(MESON_SDHC_SEND_CMD_INDEX, cmd->opcode); > + > + if (cmd->data) { > + send |= MESON_SDHC_SEND_CMD_HAS_DATA; > + send |= FIELD_PREP(MESON_SDHC_SEND_TOTAL_PACK, > + cmd->data->blocks - 1); > + > + if (cmd->data->blksz < MESON_SDHC_MAX_BLK_SIZE) > + pack_len = cmd->data->blksz; > + else > + pack_len = 0; > + > + if (cmd->data->flags & MMC_DATA_WRITE) > + send |= MESON_SDHC_SEND_DATA_DIR; > + > + /* > + * If command with no data, just wait response done > + * interrupt(int[0]), and if command with data transfer, just > + * wait dma done interrupt(int[11]), don't need care about > + * dat0 busy or not. > + */ > + if (host->platform->hardware_flush_all_cmds || > + cmd->data->flags & MMC_DATA_WRITE) > + /* hardware flush: */ > + ictl |= MESON_SDHC_ICTL_DMA_DONE; > + else > + /* software flush: */ > + ictl |= MESON_SDHC_ICTL_DATA_XFER_OK; > + } else { > + pack_len = 0; > + > + ictl |= MESON_SDHC_ICTL_RESP_OK; > + } > + > + if (cmd->opcode == MMC_STOP_TRANSMISSION) > + send |= MESON_SDHC_SEND_DATA_STOP; > + > + if (cmd->flags & MMC_RSP_PRESENT) > + send |= MESON_SDHC_SEND_CMD_HAS_RESP; > + > + if (cmd->flags & MMC_RSP_136) { > + send |= MESON_SDHC_SEND_RESP_LEN; > + send |= MESON_SDHC_SEND_RESP_NO_CRC; > + } > + > + if (!(cmd->flags & MMC_RSP_CRC)) > + send |= MESON_SDHC_SEND_RESP_NO_CRC; > + > + if (cmd->flags & MMC_RSP_BUSY) > + send |= MESON_SDHC_SEND_R1B; > + > + /* enable the new IRQs and mask all pending ones */ > + regmap_write(host->regmap, MESON_SDHC_ICTL, ictl); > + regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS); > + > + regmap_write(host->regmap, MESON_SDHC_ARGU, cmd->arg); > + > + regmap_update_bits(host->regmap, MESON_SDHC_CTRL, > + MESON_SDHC_CTRL_PACK_LEN, > + FIELD_PREP(MESON_SDHC_CTRL_PACK_LEN, pack_len)); > + > + if (cmd->data) > + regmap_write(host->regmap, MESON_SDHC_ADDR, > + sg_dma_address(cmd->data->sg)); > + > + meson_mx_sdhc_wait_cmd_ready(mmc); > + > + if (cmd->data) > + host->platform->set_pdma(mmc); > + > + if (host->platform->wait_before_send) > + host->platform->wait_before_send(mmc); > + > + regmap_write(host->regmap, MESON_SDHC_SEND, send); > +} > + > +static void meson_mx_sdhc_disable_clks(struct mmc_host *mmc) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + > + if (!host->bulk_clks_enabled) > + return; > + > + clk_bulk_disable_unprepare(MESON_SDHC_NUM_BULK_CLKS, host->bulk_clks); > + > + host->bulk_clks_enabled = false; > +} > + > +static int meson_mx_sdhc_enable_clks(struct mmc_host *mmc) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + int ret; > + > + if (host->bulk_clks_enabled) > + return 0; > + > + ret = clk_bulk_prepare_enable(MESON_SDHC_NUM_BULK_CLKS, > + host->bulk_clks); > + if (ret) > + return ret; > + > + host->bulk_clks_enabled = true; > + > + return 0; > +} > + > +static int meson_mx_sdhc_set_clk(struct mmc_host *mmc, struct mmc_ios *ios) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + u32 rx_clk_phase; > + int ret; > + > + meson_mx_sdhc_disable_clks(mmc); > + > + if (ios->clock) { > + ret = clk_set_rate(host->sd_clk, ios->clock); > + if (ret) { > + dev_warn(mmc_dev(mmc), > + "Failed to set MMC clock to %uHz: %d\n", > + ios->clock, host->error); > + return ret; > + } > + > + ret = meson_mx_sdhc_enable_clks(mmc); > + if (ret) > + return ret; > + > + mmc->actual_clock = clk_get_rate(host->sd_clk); > + > + /* > + * according to Amlogic the following latching points are > + * selected with empirical values, there is no (known) formula > + * to calculate these. > + */ > + if (mmc->actual_clock > 100000000) { > + rx_clk_phase = 1; > + } else if (mmc->actual_clock > 45000000) { > + if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) > + rx_clk_phase = 15; > + else > + rx_clk_phase = 11; > + } else if (mmc->actual_clock >= 25000000) { > + rx_clk_phase = 15; > + } else if (mmc->actual_clock > 5000000) { > + rx_clk_phase = 23; > + } else if (mmc->actual_clock > 1000000) { > + rx_clk_phase = 55; > + } else { > + rx_clk_phase = 1061; > + } > + > + regmap_update_bits(host->regmap, MESON_SDHC_CLK2, > + MESON_SDHC_CLK2_RX_CLK_PHASE, > + FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE, > + rx_clk_phase)); > + } else { > + mmc->actual_clock = 0; > + } > + > + return 0; > +} > + > +static void meson_mx_sdhc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + unsigned short vdd = ios->vdd; > + > + switch (ios->power_mode) { > + case MMC_POWER_OFF: > + vdd = 0; > + fallthrough; > + > + case MMC_POWER_UP: > + if (!IS_ERR(mmc->supply.vmmc)) { > + host->error = mmc_regulator_set_ocr(mmc, > + mmc->supply.vmmc, > + vdd); > + if (host->error) > + return; > + } > + > + break; > + > + case MMC_POWER_ON: > + break; > + } > + > + host->error = meson_mx_sdhc_set_clk(mmc, ios); > + if (host->error) > + return; > + > + switch (ios->bus_width) { > + case MMC_BUS_WIDTH_1: > + regmap_update_bits(host->regmap, MESON_SDHC_CTRL, > + MESON_SDHC_CTRL_DAT_TYPE, > + FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 0)); > + break; > + > + case MMC_BUS_WIDTH_4: > + regmap_update_bits(host->regmap, MESON_SDHC_CTRL, > + MESON_SDHC_CTRL_DAT_TYPE, > + FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 1)); > + break; > + > + case MMC_BUS_WIDTH_8: > + regmap_update_bits(host->regmap, MESON_SDHC_CTRL, > + MESON_SDHC_CTRL_DAT_TYPE, > + FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 2)); > + break; > + > + default: > + dev_err(mmc_dev(mmc), "unsupported bus width: %d\n", > + ios->bus_width); > + host->error = -EINVAL; > + return; > + } > +} > + > +static int meson_mx_sdhc_map_dma(struct mmc_host *mmc, struct mmc_request *mrq) > +{ > + struct mmc_data *data = mrq->data; > + int dma_len; > + > + if (!data) > + return 0; > + > + dma_len = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len, > + mmc_get_dma_dir(data)); > + if (dma_len <= 0) { > + dev_err(mmc_dev(mmc), "dma_map_sg failed\n"); > + return -ENOMEM; > + } > + > + return 0; > +} > + > +static void meson_mx_sdhc_request(struct mmc_host *mmc, struct mmc_request *mrq) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + struct mmc_command *cmd = mrq->cmd; > + > + if (!host->error) > + host->error = meson_mx_sdhc_map_dma(mmc, mrq); > + > + if (host->error) { > + cmd->error = host->error; > + mmc_request_done(mmc, mrq); > + return; > + } > + > + host->mrq = mrq; > + > + meson_mx_sdhc_start_cmd(mmc, mrq->cmd); > +} > + > +static int meson_mx_sdhc_card_busy(struct mmc_host *mmc) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + u32 stat; > + > + regmap_read(host->regmap, MESON_SDHC_STAT, &stat); > + return FIELD_GET(MESON_SDHC_STAT_DAT3_0, stat) == 0; > +} > + > +static bool meson_mx_sdhc_tuning_point_matches(struct mmc_host *mmc, > + u32 opcode) > +{ > + unsigned int i, num_matches = 0; > + int ret; > + > + for (i = 0; i < MESON_SDHC_NUM_TUNING_TRIES; i++) { > + ret = mmc_send_tuning(mmc, opcode, NULL); > + if (!ret) > + num_matches++; > + } > + > + return num_matches == MESON_SDHC_NUM_TUNING_TRIES; > +} > + > +static int meson_mx_sdhc_execute_tuning(struct mmc_host *mmc, u32 opcode) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + int div, start, len, best_start, best_len; > + int curr_phase, old_phase, new_phase; > + u32 val; > + > + len = 0; > + start = 0; > + best_len = 0; > + > + regmap_read(host->regmap, MESON_SDHC_CLK2, &val); > + old_phase = FIELD_GET(MESON_SDHC_CLK2_RX_CLK_PHASE, val); > + > + regmap_read(host->regmap, MESON_SDHC_CLKC, &val); > + div = FIELD_GET(MESON_SDHC_CLKC_CLK_DIV, val); > + > + for (curr_phase = 0; curr_phase <= div; curr_phase++) { > + regmap_update_bits(host->regmap, MESON_SDHC_CLK2, > + MESON_SDHC_CLK2_RX_CLK_PHASE, > + FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE, > + curr_phase)); > + > + if (meson_mx_sdhc_tuning_point_matches(mmc, opcode)) { > + if (!len) { > + start = curr_phase; > + > + dev_dbg(mmc_dev(mmc), > + "New RX phase window starts at %u\n", > + start); > + } > + > + len++; > + } else { > + if (len > best_len) { > + best_start = start; > + best_len = len; > + > + dev_dbg(mmc_dev(mmc), > + "New best RX phase window: %u - %u\n", > + best_start, best_start + best_len); > + } > + > + /* reset the current window */ > + len = 0; > + } > + } > + > + if (len > best_len) > + /* the last window is the best (or possibly only) window */ > + new_phase = start + (len / 2); > + else if (best_len) > + /* there was a better window than the last */ > + new_phase = best_start + (best_len / 2); > + else > + /* no window was found at all, reset to the original phase */ > + new_phase = old_phase; > + > + regmap_update_bits(host->regmap, MESON_SDHC_CLK2, > + MESON_SDHC_CLK2_RX_CLK_PHASE, > + FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE, > + new_phase)); > + > + if (!len && !best_len) > + return -EIO; > + > + dev_dbg(mmc_dev(mmc), "Tuned RX clock phase to %u\n", new_phase); > + > + return 0; > +} > + > +static const struct mmc_host_ops meson_mx_sdhc_ops = { > + .hw_reset = meson_mx_sdhc_hw_reset, > + .request = meson_mx_sdhc_request, > + .set_ios = meson_mx_sdhc_set_ios, > + .card_busy = meson_mx_sdhc_card_busy, > + .execute_tuning = meson_mx_sdhc_execute_tuning, > + .get_cd = mmc_gpio_get_cd, > + .get_ro = mmc_gpio_get_ro, > +}; > + > +static void meson_mx_sdhc_request_done(struct meson_mx_sdhc_host *host) > +{ > + struct mmc_request *mrq = host->mrq; > + struct mmc_host *mmc = host->mmc; > + > + /* disable interrupts and mask all pending ones */ > + regmap_update_bits(host->regmap, MESON_SDHC_ICTL, > + MESON_SDHC_ICTL_ALL_IRQS, 0); > + regmap_update_bits(host->regmap, MESON_SDHC_ISTA, > + MESON_SDHC_ISTA_ALL_IRQS, MESON_SDHC_ISTA_ALL_IRQS); > + > + host->mrq = NULL; > + host->cmd = NULL; > + > + mmc_request_done(mmc, mrq); > +} > + > +static u32 meson_mx_sdhc_read_response(struct meson_mx_sdhc_host *host, u8 idx) > +{ > + u32 val; > + > + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, > + MESON_SDHC_PDMA_DMA_MODE, 0); > + > + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, > + MESON_SDHC_PDMA_PIO_RDRESP, > + FIELD_PREP(MESON_SDHC_PDMA_PIO_RDRESP, idx)); > + > + regmap_read(host->regmap, MESON_SDHC_ARGU, &val); > + > + return val; > +} > + > +static irqreturn_t meson_mx_sdhc_irq(int irq, void *data) > +{ > + struct meson_mx_sdhc_host *host = data; > + struct mmc_command *cmd = host->cmd; > + u32 ictl, ista; > + > + regmap_read(host->regmap, MESON_SDHC_ICTL, &ictl); > + regmap_read(host->regmap, MESON_SDHC_ISTA, &ista); > + > + if (!(ictl & ista)) > + return IRQ_NONE; > + > + if (ista & MESON_SDHC_ISTA_RXFIFO_FULL || > + ista & MESON_SDHC_ISTA_TXFIFO_EMPTY) > + cmd->error = -EIO; > + else if (ista & MESON_SDHC_ISTA_RESP_ERR_CRC) > + cmd->error = -EILSEQ; > + else if (ista & MESON_SDHC_ISTA_RESP_TIMEOUT) > + cmd->error = -ETIMEDOUT; > + > + if (cmd->data) { > + if (ista & MESON_SDHC_ISTA_DATA_ERR_CRC) > + cmd->data->error = -EILSEQ; > + else if (ista & MESON_SDHC_ISTA_DATA_TIMEOUT) > + cmd->data->error = -ETIMEDOUT; > + } > + > + if (cmd->error || (cmd->data && cmd->data->error)) > + dev_dbg(mmc_dev(host->mmc), "CMD%d error, ISTA: 0x%08x\n", > + cmd->opcode, ista); > + > + return IRQ_WAKE_THREAD; > +} > + > +static irqreturn_t meson_mx_sdhc_irq_thread(int irq, void *irq_data) > +{ > + struct meson_mx_sdhc_host *host = irq_data; > + struct mmc_command *cmd; > + u32 val; > + > + cmd = host->cmd; > + if (WARN_ON(!cmd)) > + return IRQ_HANDLED; > + > + if (cmd->data && !cmd->data->error) { > + if (!host->platform->hardware_flush_all_cmds && > + cmd->data->flags & MMC_DATA_READ) { > + meson_mx_sdhc_wait_cmd_ready(host->mmc); > + > + val = FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, > + 2); > + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, > + MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, > + val); > + } > + > + dma_unmap_sg(mmc_dev(host->mmc), cmd->data->sg, > + cmd->data->sg_len, mmc_get_dma_dir(cmd->data)); > + > + cmd->data->bytes_xfered = cmd->data->blksz * cmd->data->blocks; > + } > + > + meson_mx_sdhc_wait_cmd_ready(host->mmc); > + > + if (cmd->flags & MMC_RSP_136) { > + cmd->resp[0] = meson_mx_sdhc_read_response(host, 4); > + cmd->resp[1] = meson_mx_sdhc_read_response(host, 3); > + cmd->resp[2] = meson_mx_sdhc_read_response(host, 2); > + cmd->resp[3] = meson_mx_sdhc_read_response(host, 1); > + } else { > + cmd->resp[0] = meson_mx_sdhc_read_response(host, 0); > + } > + > + if (cmd->error == -EIO || cmd->error == -ETIMEDOUT) > + meson_mx_sdhc_hw_reset(host->mmc); > + else if (cmd->data) > + /* > + * Clear the FIFOs after completing data transfers to prevent > + * corrupting data on write access. It's not clear why this is > + * needed (for reads and writes), but it mimics what the BSP > + * kernel did. > + */ > + meson_mx_sdhc_clear_fifo(host->mmc); > + > + meson_mx_sdhc_request_done(host); > + > + return IRQ_HANDLED; > +} > + > +static void meson_mx_sdhc_init_hw_meson8(struct mmc_host *mmc) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + > + regmap_write(host->regmap, MESON_SDHC_MISC, > + FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 7) | > + FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) | > + FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2)); > + > + regmap_write(host->regmap, MESON_SDHC_ENHC, > + FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 63) | > + MESON_SDHC_ENHC_MESON6_DMA_WR_RESP | > + FIELD_PREP(MESON_SDHC_ENHC_MESON6_RX_TIMEOUT, 255) | > + FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12)); > +}; > + > +static void meson_mx_sdhc_set_pdma_meson8(struct mmc_host *mmc) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + > + if (host->cmd->data->flags & MMC_DATA_WRITE) > + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, > + MESON_SDHC_PDMA_DMA_MODE | > + MESON_SDHC_PDMA_RD_BURST | > + MESON_SDHC_PDMA_TXFIFO_FILL, > + MESON_SDHC_PDMA_DMA_MODE | > + FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 31) | > + MESON_SDHC_PDMA_TXFIFO_FILL); > + else > + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, > + MESON_SDHC_PDMA_DMA_MODE | > + MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, > + MESON_SDHC_PDMA_DMA_MODE | > + FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, > + 1)); > + > + if (host->cmd->data->flags & MMC_DATA_WRITE) > + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, > + MESON_SDHC_PDMA_RD_BURST, > + FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15)); > +} > + > +static void meson_mx_sdhc_wait_before_send_meson8(struct mmc_host *mmc) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + u32 val; > + int ret; > + > + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, val, > + val == 0, > + MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US, > + MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US); > + if (ret) > + dev_warn(mmc_dev(mmc), > + "Failed to wait for ESTA to clear: 0x%08x\n", val); > + > + if (host->cmd->data && host->cmd->data->flags & MMC_DATA_WRITE) { > + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT, > + val, val & MESON_SDHC_STAT_TXFIFO_CNT, > + MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US, > + MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US); > + if (ret) > + dev_warn(mmc_dev(mmc), > + "Failed to wait for TX FIFO to fill\n"); > + } > +} > + > +static void meson_mx_sdhc_init_hw_meson8m2(struct mmc_host *mmc) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + > + regmap_write(host->regmap, MESON_SDHC_MISC, > + FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 6) | > + FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) | > + FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2)); > + > + regmap_write(host->regmap, MESON_SDHC_ENHC, > + FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 64) | > + FIELD_PREP(MESON_SDHC_ENHC_MESON8M2_DEBUG, 1) | > + MESON_SDHC_ENHC_MESON8M2_WRRSP_MODE | > + FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12)); > +} > + > +static void meson_mx_sdhc_set_pdma_meson8m2(struct mmc_host *mmc) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + > + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, > + MESON_SDHC_PDMA_DMA_MODE, MESON_SDHC_PDMA_DMA_MODE); > +} > + > +static void meson_mx_sdhc_init_hw(struct mmc_host *mmc) > +{ > + struct meson_mx_sdhc_host *host = mmc_priv(mmc); > + > + meson_mx_sdhc_hw_reset(mmc); > + > + regmap_write(host->regmap, MESON_SDHC_CTRL, > + FIELD_PREP(MESON_SDHC_CTRL_RX_PERIOD, 0xf) | > + FIELD_PREP(MESON_SDHC_CTRL_RX_TIMEOUT, 0x7f) | > + FIELD_PREP(MESON_SDHC_CTRL_RX_ENDIAN, 0x7) | > + FIELD_PREP(MESON_SDHC_CTRL_TX_ENDIAN, 0x7)); > + > + /* > + * start with a valid divider and enable the memory (un-setting > + * MESON_SDHC_CLKC_MEM_PWR_OFF). > + */ > + regmap_write(host->regmap, MESON_SDHC_CLKC, MESON_SDHC_CLKC_CLK_DIV); > + > + regmap_write(host->regmap, MESON_SDHC_CLK2, > + FIELD_PREP(MESON_SDHC_CLK2_SD_CLK_PHASE, 1)); > + > + regmap_write(host->regmap, MESON_SDHC_PDMA, > + MESON_SDHC_PDMA_DMA_URGENT | > + FIELD_PREP(MESON_SDHC_PDMA_WR_BURST, 7) | > + FIELD_PREP(MESON_SDHC_PDMA_TXFIFO_TH, 49) | > + FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15) | > + FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_TH, 7)); > + > + /* some initialization bits depend on the SoC: */ > + host->platform->init_hw(mmc); > + > + /* disable and mask all interrupts: */ > + regmap_write(host->regmap, MESON_SDHC_ICTL, 0); > + regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS); > +} > + > +static int meson_mx_sdhc_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct meson_mx_sdhc_host *host; > + struct mmc_host *mmc; > + void __iomem *base; > + int ret, irq; > + > + mmc = mmc_alloc_host(sizeof(*host), dev); > + if (!mmc) > + return -ENOMEM; > + > + ret = devm_add_action_or_reset(dev, (void(*)(void *))mmc_free_host, > + mmc); > + if (ret) { > + dev_err(dev, "Failed to register mmc_free_host action\n"); > + return ret; > + } > + > + host = mmc_priv(mmc); > + host->mmc = mmc; > + > + platform_set_drvdata(pdev, host); > + > + host->platform = device_get_match_data(dev); > + if (!host->platform) > + return -EINVAL; > + > + base = devm_platform_ioremap_resource(pdev, 0); > + if (IS_ERR(base)) > + return PTR_ERR(base); > + > + host->regmap = devm_regmap_init_mmio(dev, base, > + &meson_mx_sdhc_regmap_config); > + if (IS_ERR(host->regmap)) > + return PTR_ERR(host->regmap); > + > + host->pclk = devm_clk_get(dev, "pclk"); > + if (IS_ERR(host->pclk)) > + return PTR_ERR(host->pclk); > + > + /* accessing any register requires the module clock to be enabled: */ > + ret = clk_prepare_enable(host->pclk); > + if (ret) { > + dev_err(dev, "Failed to enable 'pclk' clock\n"); > + return ret; > + } > + > + meson_mx_sdhc_init_hw(mmc); > + > + ret = meson_mx_sdhc_register_clkc(dev, base, host->bulk_clks); > + if (ret) > + goto err_disable_pclk; > + > + host->sd_clk = host->bulk_clks[1].clk; > + > + /* Get regulators and the supported OCR mask */ > + ret = mmc_regulator_get_supply(mmc); > + if (ret) > + goto err_disable_pclk; > + > + mmc->max_req_size = SZ_128K; > + mmc->max_seg_size = mmc->max_req_size; > + mmc->max_blk_count = FIELD_GET(MESON_SDHC_SEND_TOTAL_PACK, ~0); > + mmc->max_blk_size = MESON_SDHC_MAX_BLK_SIZE; > + mmc->max_busy_timeout = 30 * MSEC_PER_SEC; > + mmc->f_min = clk_round_rate(host->sd_clk, 1); > + mmc->f_max = clk_round_rate(host->sd_clk, ULONG_MAX); > + mmc->max_current_180 = 300; > + mmc->max_current_330 = 300; > + mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_HW_RESET; > + mmc->ops = &meson_mx_sdhc_ops; > + > + ret = mmc_of_parse(mmc); > + if (ret) > + goto err_disable_pclk; > + > + irq = platform_get_irq(pdev, 0); > + ret = devm_request_threaded_irq(dev, irq, meson_mx_sdhc_irq, > + meson_mx_sdhc_irq_thread, IRQF_ONESHOT, > + NULL, host); > + if (ret) > + goto err_disable_pclk; > + > + ret = mmc_add_host(mmc); > + if (ret) > + goto err_disable_pclk; > + > + return 0; > + > +err_disable_pclk: > + clk_disable_unprepare(host->pclk); > + return ret; > +} > + > +static int meson_mx_sdhc_remove(struct platform_device *pdev) > +{ > + struct meson_mx_sdhc_host *host = platform_get_drvdata(pdev); > + > + mmc_remove_host(host->mmc); > + > + meson_mx_sdhc_disable_clks(host->mmc); > + > + clk_disable_unprepare(host->pclk); > + > + return 0; > +} > + > +static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8 = { > + .init_hw = meson_mx_sdhc_init_hw_meson8, > + .set_pdma = meson_mx_sdhc_set_pdma_meson8, > + .wait_before_send = meson_mx_sdhc_wait_before_send_meson8, > + .hardware_flush_all_cmds = false, > +}; > + > +static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8m2 = { > + .init_hw = meson_mx_sdhc_init_hw_meson8m2, > + .set_pdma = meson_mx_sdhc_set_pdma_meson8m2, > + .hardware_flush_all_cmds = true, > +}; > + > +static const struct of_device_id meson_mx_sdhc_of_match[] = { > + { > + .compatible = "amlogic,meson8-sdhc", > + .data = &meson_mx_sdhc_data_meson8 > + }, > + { > + .compatible = "amlogic,meson8b-sdhc", > + .data = &meson_mx_sdhc_data_meson8 > + }, > + { > + .compatible = "amlogic,meson8m2-sdhc", > + .data = &meson_mx_sdhc_data_meson8m2 > + }, > + { /* sentinel */ } > +}; > +MODULE_DEVICE_TABLE(of, meson_mx_sdhc_of_match); > + > +static struct platform_driver meson_mx_sdhc_driver = { > + .probe = meson_mx_sdhc_probe, > + .remove = meson_mx_sdhc_remove, > + .driver = { > + .name = "meson-mx-sdhc", > + .of_match_table = of_match_ptr(meson_mx_sdhc_of_match), > + }, > +}; > + > +module_platform_driver(meson_mx_sdhc_driver); > + > +MODULE_DESCRIPTION("Meson6, Meson8, Meson8b and Meson8m2 SDHC Host Driver"); > +MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>"); > +MODULE_LICENSE("GPL v2"); > diff --git a/drivers/mmc/host/meson-mx-sdhc.h b/drivers/mmc/host/meson-mx-sdhc.h > new file mode 100644 > index 000000000000..230e8fbe6b3f > --- /dev/null > +++ b/drivers/mmc/host/meson-mx-sdhc.h > @@ -0,0 +1,141 @@ > +/* SPDX-License-Identifier: GPL-2.0+ */ > +/* > + * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com> > + */ > + > +#ifndef _MESON_MX_SDHC_H_ > +#define _MESON_MX_SDHC_H_ > + > +#include <linux/bitfield.h> > + > +#define MESON_SDHC_ARGU 0x00 > + > +#define MESON_SDHC_SEND 0x04 > + #define MESON_SDHC_SEND_CMD_INDEX GENMASK(5, 0) > + #define MESON_SDHC_SEND_CMD_HAS_RESP BIT(6) > + #define MESON_SDHC_SEND_CMD_HAS_DATA BIT(7) > + #define MESON_SDHC_SEND_RESP_LEN BIT(8) > + #define MESON_SDHC_SEND_RESP_NO_CRC BIT(9) > + #define MESON_SDHC_SEND_DATA_DIR BIT(10) > + #define MESON_SDHC_SEND_DATA_STOP BIT(11) > + #define MESON_SDHC_SEND_R1B BIT(12) > + #define MESON_SDHC_SEND_TOTAL_PACK GENMASK(31, 16) > + > +#define MESON_SDHC_CTRL 0x08 > + #define MESON_SDHC_CTRL_DAT_TYPE GENMASK(1, 0) > + #define MESON_SDHC_CTRL_DDR_MODE BIT(2) > + #define MESON_SDHC_CTRL_TX_CRC_NOCHECK BIT(3) > + #define MESON_SDHC_CTRL_PACK_LEN GENMASK(12, 4) > + #define MESON_SDHC_CTRL_RX_TIMEOUT GENMASK(19, 13) > + #define MESON_SDHC_CTRL_RX_PERIOD GENMASK(23, 20) > + #define MESON_SDHC_CTRL_RX_ENDIAN GENMASK(26, 24) > + #define MESON_SDHC_CTRL_SDIO_IRQ_MODE BIT(27) > + #define MESON_SDHC_CTRL_DAT0_IRQ_SEL BIT(28) > + #define MESON_SDHC_CTRL_TX_ENDIAN GENMASK(31, 29) > + > +#define MESON_SDHC_STAT 0x0c > + #define MESON_SDHC_STAT_CMD_BUSY BIT(0) > + #define MESON_SDHC_STAT_DAT3_0 GENMASK(4, 1) > + #define MESON_SDHC_STAT_CMD BIT(5) > + #define MESON_SDHC_STAT_RXFIFO_CNT GENMASK(12, 6) > + #define MESON_SDHC_STAT_TXFIFO_CNT GENMASK(19, 13) > + #define MESON_SDHC_STAT_DAT7_4 GENMASK(23, 20) > + > +#define MESON_SDHC_CLKC 0x10 > + #define MESON_SDHC_CLKC_CLK_DIV GENMASK(11, 0) > + #define MESON_SDHC_CLKC_CLK_JIC BIT(24) > + #define MESON_SDHC_CLKC_MEM_PWR_OFF GENMASK(26, 25) > + > +#define MESON_SDHC_ADDR 0x14 > + > +#define MESON_SDHC_PDMA 0x18 > + #define MESON_SDHC_PDMA_DMA_MODE BIT(0) > + #define MESON_SDHC_PDMA_PIO_RDRESP GENMASK(3, 1) > + #define MESON_SDHC_PDMA_DMA_URGENT BIT(4) > + #define MESON_SDHC_PDMA_WR_BURST GENMASK(9, 5) > + #define MESON_SDHC_PDMA_RD_BURST GENMASK(14, 10) > + #define MESON_SDHC_PDMA_RXFIFO_TH GENMASK(21, 15) > + #define MESON_SDHC_PDMA_TXFIFO_TH GENMASK(28, 22) > + #define MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH GENMASK(30, 29) > + #define MESON_SDHC_PDMA_TXFIFO_FILL BIT(31) > + > +#define MESON_SDHC_MISC 0x1c > + #define MESON_SDHC_MISC_WCRC_ERR_PATT GENMASK(6, 4) > + #define MESON_SDHC_MISC_WCRC_OK_PATT GENMASK(9, 7) > + #define MESON_SDHC_MISC_BURST_NUM GENMASK(21, 16) > + #define MESON_SDHC_MISC_THREAD_ID GENMASK(27, 22) > + #define MESON_SDHC_MISC_MANUAL_STOP BIT(28) > + #define MESON_SDHC_MISC_TXSTART_THRES GENMASK(31, 29) > + > +#define MESON_SDHC_DATA 0x20 > + > +#define MESON_SDHC_ICTL 0x24 > + #define MESON_SDHC_ICTL_RESP_OK BIT(0) > + #define MESON_SDHC_ICTL_RESP_TIMEOUT BIT(1) > + #define MESON_SDHC_ICTL_RESP_ERR_CRC BIT(2) > + #define MESON_SDHC_ICTL_RESP_OK_NOCLEAR BIT(3) > + #define MESON_SDHC_ICTL_DATA_1PACK_OK BIT(4) > + #define MESON_SDHC_ICTL_DATA_TIMEOUT BIT(5) > + #define MESON_SDHC_ICTL_DATA_ERR_CRC BIT(6) > + #define MESON_SDHC_ICTL_DATA_XFER_OK BIT(7) > + #define MESON_SDHC_ICTL_RX_HIGHER BIT(8) > + #define MESON_SDHC_ICTL_RX_LOWER BIT(9) > + #define MESON_SDHC_ICTL_DAT1_IRQ BIT(10) > + #define MESON_SDHC_ICTL_DMA_DONE BIT(11) > + #define MESON_SDHC_ICTL_RXFIFO_FULL BIT(12) > + #define MESON_SDHC_ICTL_TXFIFO_EMPTY BIT(13) > + #define MESON_SDHC_ICTL_ADDI_DAT1_IRQ BIT(14) > + #define MESON_SDHC_ICTL_ALL_IRQS GENMASK(14, 0) > + #define MESON_SDHC_ICTL_DAT1_IRQ_DELAY GENMASK(17, 16) > + > +#define MESON_SDHC_ISTA 0x28 > + #define MESON_SDHC_ISTA_RESP_OK BIT(0) > + #define MESON_SDHC_ISTA_RESP_TIMEOUT BIT(1) > + #define MESON_SDHC_ISTA_RESP_ERR_CRC BIT(2) > + #define MESON_SDHC_ISTA_RESP_OK_NOCLEAR BIT(3) > + #define MESON_SDHC_ISTA_DATA_1PACK_OK BIT(4) > + #define MESON_SDHC_ISTA_DATA_TIMEOUT BIT(5) > + #define MESON_SDHC_ISTA_DATA_ERR_CRC BIT(6) > + #define MESON_SDHC_ISTA_DATA_XFER_OK BIT(7) > + #define MESON_SDHC_ISTA_RX_HIGHER BIT(8) > + #define MESON_SDHC_ISTA_RX_LOWER BIT(9) > + #define MESON_SDHC_ISTA_DAT1_IRQ BIT(10) > + #define MESON_SDHC_ISTA_DMA_DONE BIT(11) > + #define MESON_SDHC_ISTA_RXFIFO_FULL BIT(12) > + #define MESON_SDHC_ISTA_TXFIFO_EMPTY BIT(13) > + #define MESON_SDHC_ISTA_ADDI_DAT1_IRQ BIT(14) > + #define MESON_SDHC_ISTA_ALL_IRQS GENMASK(14, 0) > + > +#define MESON_SDHC_SRST 0x2c > + #define MESON_SDHC_SRST_MAIN_CTRL BIT(0) > + #define MESON_SDHC_SRST_RXFIFO BIT(1) > + #define MESON_SDHC_SRST_TXFIFO BIT(2) > + #define MESON_SDHC_SRST_DPHY_RX BIT(3) > + #define MESON_SDHC_SRST_DPHY_TX BIT(4) > + #define MESON_SDHC_SRST_DMA_IF BIT(5) > + > +#define MESON_SDHC_ESTA 0x30 > + #define MESON_SDHC_ESTA_11_13 GENMASK(13, 11) > + > +#define MESON_SDHC_ENHC 0x34 > + #define MESON_SDHC_ENHC_MESON8M2_WRRSP_MODE BIT(0) > + #define MESON_SDHC_ENHC_MESON8M2_CHK_WRRSP BIT(1) > + #define MESON_SDHC_ENHC_MESON8M2_CHK_DMA BIT(2) > + #define MESON_SDHC_ENHC_MESON8M2_DEBUG GENMASK(5, 3) > + #define MESON_SDHC_ENHC_MESON6_RX_TIMEOUT GENMASK(7, 0) > + #define MESON_SDHC_ENHC_MESON6_DMA_RD_RESP BIT(16) > + #define MESON_SDHC_ENHC_MESON6_DMA_WR_RESP BIT(17) > + #define MESON_SDHC_ENHC_SDIO_IRQ_PERIOD GENMASK(15, 8) > + #define MESON_SDHC_ENHC_RXFIFO_TH GENMASK(24, 18) > + #define MESON_SDHC_ENHC_TXFIFO_TH GENMASK(31, 25) > + > +#define MESON_SDHC_CLK2 0x38 > + #define MESON_SDHC_CLK2_RX_CLK_PHASE GENMASK(11, 0) > + #define MESON_SDHC_CLK2_SD_CLK_PHASE GENMASK(23, 12) > + > +struct clk_bulk_data; > + > +int meson_mx_sdhc_register_clkc(struct device *dev, void __iomem *base, > + struct clk_bulk_data *clk_bulk_data); > + > +#endif /* _MESON_MX_SDHC_H_ */ > -- > 2.26.2 >
On Wed 13 May 2020 at 14:04, Ulf Hansson <ulf.hansson@linaro.org> wrote: > On Tue, 12 May 2020 at 22:42, Martin Blumenstingl > <martin.blumenstingl@googlemail.com> wrote: >> >> The SDHC MMC host controller on Amlogic SoCs provides an eMMC and MMC >> card interface with 1/4/8-bit bus width. >> It supports eMMC spec 4.4x/4.5x including HS200 (up to 100MHz clock). >> >> The public S805 datasheet [0] contains a short documentation about the >> registers. Unfortunately it does not describe how to use the registers >> to make the hardware work. Thus this driver is based on reading (and >> understanding) the Amlogic 3.10 GPL kernel code. >> >> Some hardware details are not easy to see. Jianxin Pan was kind enough >> to answer my questions: >> The hardware has built-in busy timeout support. The maximum timeout is >> 30 seconds. This is only documented in Amlogic's internal >> documentation. >> >> The controller only works with very specific clock configurations. The >> details are not part of the public datasheet. In my own words the >> supported configurations are: >> - 399.812kHz: clkin = 850MHz div = 2126 sd_rx_phase = 63 >> - 1MHz: clkin = 850MHz div = 850 sd_rx_phase = 55 >> - 5.986MHz: clkin = 850MHz div = 142 sd_rx_phase = 24 >> - 25MHz: clkin = 850MHz div = 34 sd_rx_phase = 15 >> - 47.222MHz: clkin = 850MHz div = 18 sd_rx_phase = 11/15 (SDR50/HS) >> - 53.125MHz: clkin = 850MHz div = 16 sd_rx_phase = (tuning) >> - 70.833MHz: clkin = 850MHz div = 12 sd_rx_phase = (tuning) >> - 85MHz: clkin = 850MHz div = 10 sd_rx_phase = (tuning) >> - 94.44MHz: clkin = 850MHz div = 9 sd_rx_phase = (tuning) >> - 106.25MHz: clkin = 850MHz div = 8 sd_rx_phase = (tuning) >> - 127.5MHz: clkin = 1275MHz div = 10 sd_rx_phase = (tuning) >> - 141.667MHz: clkin = 850MHz div = 6 sd_rx_phase = (tuning) >> - 159.375MHz: clkin = 1275MHz div = 8 sd_rx_phase = (tuning) >> - 212.5MHz: clkin = 1275MHz div = 6 sd_rx_phase = (tuning) >> - (sd_tx_phase is always 1, 94.44MHz is not listed in the datasheet >> but this is what the 3.10 BSP kernel on Odroid-C1 actually uses) >> >> NOTE: CMD23 support is disabled for now because it results in command >> timeouts and thus decreases read performance. >> >> Tested-by: Wei Wang <lnykww@gmail.com> >> Tested-by: Xin Yin <yinxin_1989@aliyun.com> >> Reviewed-by: Xin Yin <yinxin_1989@aliyun.com> >> Tested-by: Anand Moon <linux.amoon@gmail.com> >> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> > > This looks good to me, however I am awaiting a reviewed-by tag from > Jerome, to make sure the clock implementation turn out as agreed upon. Thx ! Reviewed-by: Jerome Brunet <jbrunet@baylibre.com> > > Kind regards > Uffe > >> --- >> drivers/mmc/host/Kconfig | 14 + >> drivers/mmc/host/Makefile | 1 + >> drivers/mmc/host/meson-mx-sdhc-clkc.c | 158 +++++ >> drivers/mmc/host/meson-mx-sdhc.c | 907 ++++++++++++++++++++++++++ >> drivers/mmc/host/meson-mx-sdhc.h | 141 ++++ >> 5 files changed, 1221 insertions(+) >> create mode 100644 drivers/mmc/host/meson-mx-sdhc-clkc.c >> create mode 100644 drivers/mmc/host/meson-mx-sdhc.c >> create mode 100644 drivers/mmc/host/meson-mx-sdhc.h >> >> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig >> index 462b5352fea7..df3fc572f842 100644 >> --- a/drivers/mmc/host/Kconfig >> +++ b/drivers/mmc/host/Kconfig >> @@ -405,6 +405,20 @@ config MMC_MESON_GX >> >> If you have a controller with this interface, say Y here. >> >> +config MMC_MESON_MX_SDHC >> + tristate "Amlogic Meson SDHC Host Controller support" >> + depends on (ARM && ARCH_MESON) || COMPILE_TEST >> + depends on COMMON_CLK >> + depends on OF >> + help >> + This selects support for the SDHC Host Controller on >> + Amlogic Meson6, Meson8, Meson8b and Meson8m2 SoCs. >> + The controller supports the SD/SDIO Spec 3.x and eMMC Spec 4.5x >> + with 1, 4, and 8 bit bus widths. >> + >> + If you have a controller with this interface, say Y or M here. >> + If unsure, say N. >> + >> config MMC_MESON_MX_SDIO >> tristate "Amlogic Meson6/Meson8/Meson8b SD/MMC Host Controller support" >> depends on ARCH_MESON || COMPILE_TEST >> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile >> index b929ef941208..8bcb420e071c 100644 >> --- a/drivers/mmc/host/Makefile >> +++ b/drivers/mmc/host/Makefile >> @@ -68,6 +68,7 @@ obj-$(CONFIG_MMC_VUB300) += vub300.o >> obj-$(CONFIG_MMC_USHC) += ushc.o >> obj-$(CONFIG_MMC_WMT) += wmt-sdmmc.o >> obj-$(CONFIG_MMC_MESON_GX) += meson-gx-mmc.o >> +obj-$(CONFIG_MMC_MESON_MX_SDHC) += meson-mx-sdhc-clkc.o meson-mx-sdhc.o >> obj-$(CONFIG_MMC_MESON_MX_SDIO) += meson-mx-sdio.o >> obj-$(CONFIG_MMC_MOXART) += moxart-mmc.o >> obj-$(CONFIG_MMC_SUNXI) += sunxi-mmc.o >> diff --git a/drivers/mmc/host/meson-mx-sdhc-clkc.c b/drivers/mmc/host/meson-mx-sdhc-clkc.c >> new file mode 100644 >> index 000000000000..ab0d6c68a078 >> --- /dev/null >> +++ b/drivers/mmc/host/meson-mx-sdhc-clkc.c >> @@ -0,0 +1,158 @@ >> +// SPDX-License-Identifier: GPL-2.0+ >> +/* >> + * Amlogic Meson SDHC clock controller >> + * >> + * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com> >> + */ >> + >> +#include <linux/clk.h> >> +#include <linux/clk-provider.h> >> +#include <linux/device.h> >> +#include <linux/platform_device.h> >> + >> +#include "meson-mx-sdhc.h" >> + >> +#define MESON_SDHC_NUM_BUILTIN_CLKS 6 >> + >> +struct meson_mx_sdhc_clkc { >> + struct clk_mux src_sel; >> + struct clk_divider div; >> + struct clk_gate mod_clk_en; >> + struct clk_gate tx_clk_en; >> + struct clk_gate rx_clk_en; >> + struct clk_gate sd_clk_en; >> +}; >> + >> +static const struct clk_parent_data meson_mx_sdhc_src_sel_parents[4] = { >> + { .fw_name = "clkin0" }, >> + { .fw_name = "clkin1" }, >> + { .fw_name = "clkin2" }, >> + { .fw_name = "clkin3" }, >> +}; >> + >> +static const struct clk_div_table meson_mx_sdhc_div_table[] = { >> + { .div = 6, .val = 5, }, >> + { .div = 8, .val = 7, }, >> + { .div = 9, .val = 8, }, >> + { .div = 10, .val = 9, }, >> + { .div = 12, .val = 11, }, >> + { .div = 16, .val = 15, }, >> + { .div = 18, .val = 17, }, >> + { .div = 34, .val = 33, }, >> + { .div = 142, .val = 141, }, >> + { .div = 850, .val = 849, }, >> + { .div = 2126, .val = 2125, }, >> + { .div = 4096, .val = 4095, }, >> + { /* sentinel */ } >> +}; >> + >> +static int meson_mx_sdhc_clk_hw_register(struct device *dev, >> + const char *name_suffix, >> + const struct clk_parent_data *parents, >> + unsigned int num_parents, >> + const struct clk_ops *ops, >> + struct clk_hw *hw) >> +{ >> + struct clk_init_data init = { 0 }; >> + char clk_name[32]; >> + >> + snprintf(clk_name, sizeof(clk_name), "%s#%s", dev_name(dev), >> + name_suffix); >> + >> + init.name = clk_name; >> + init.ops = ops; >> + init.flags = CLK_SET_RATE_PARENT; >> + init.parent_data = parents; >> + init.num_parents = num_parents; >> + >> + hw->init = &init; >> + >> + return devm_clk_hw_register(dev, hw); >> +} >> + >> +static int meson_mx_sdhc_gate_clk_hw_register(struct device *dev, >> + const char *name_suffix, >> + struct clk_hw *parent, >> + struct clk_hw *hw) >> +{ >> + struct clk_parent_data parent_data = { .hw = parent }; >> + >> + return meson_mx_sdhc_clk_hw_register(dev, name_suffix, &parent_data, 1, >> + &clk_gate_ops, hw); >> +} >> + >> +int meson_mx_sdhc_register_clkc(struct device *dev, void __iomem *base, >> + struct clk_bulk_data *clk_bulk_data) >> +{ >> + struct clk_parent_data div_parent = { 0 }; >> + struct meson_mx_sdhc_clkc *clkc_data; >> + int ret; >> + >> + clkc_data = devm_kzalloc(dev, sizeof(*clkc_data), GFP_KERNEL); >> + if (!clkc_data) >> + return -ENOMEM; >> + >> + clkc_data->src_sel.reg = base + MESON_SDHC_CLKC; >> + clkc_data->src_sel.mask = 0x3; >> + clkc_data->src_sel.shift = 16; >> + ret = meson_mx_sdhc_clk_hw_register(dev, "src_sel", >> + meson_mx_sdhc_src_sel_parents, 4, >> + &clk_mux_ops, >> + &clkc_data->src_sel.hw); >> + if (ret) >> + return ret; >> + >> + clkc_data->div.reg = base + MESON_SDHC_CLKC; >> + clkc_data->div.shift = 0; >> + clkc_data->div.width = 12; >> + clkc_data->div.table = meson_mx_sdhc_div_table; >> + div_parent.hw = &clkc_data->src_sel.hw; >> + ret = meson_mx_sdhc_clk_hw_register(dev, "div", &div_parent, 1, >> + &clk_divider_ops, >> + &clkc_data->div.hw); >> + if (ret) >> + return ret; >> + >> + clkc_data->mod_clk_en.reg = base + MESON_SDHC_CLKC; >> + clkc_data->mod_clk_en.bit_idx = 15; >> + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "mod_clk_on", >> + &clkc_data->div.hw, >> + &clkc_data->mod_clk_en.hw); >> + if (ret) >> + return ret; >> + >> + clkc_data->tx_clk_en.reg = base + MESON_SDHC_CLKC; >> + clkc_data->tx_clk_en.bit_idx = 14; >> + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "tx_clk_on", >> + &clkc_data->div.hw, >> + &clkc_data->tx_clk_en.hw); >> + if (ret) >> + return ret; >> + >> + clkc_data->rx_clk_en.reg = base + MESON_SDHC_CLKC; >> + clkc_data->rx_clk_en.bit_idx = 13; >> + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "rx_clk_on", >> + &clkc_data->div.hw, >> + &clkc_data->rx_clk_en.hw); >> + if (ret) >> + return ret; >> + >> + clkc_data->sd_clk_en.reg = base + MESON_SDHC_CLKC; >> + clkc_data->sd_clk_en.bit_idx = 12; >> + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "sd_clk_on", >> + &clkc_data->div.hw, >> + &clkc_data->sd_clk_en.hw); >> + if (ret) >> + return ret; >> + >> + /* >> + * TODO: Replace clk_hw.clk with devm_clk_hw_get_clk() once that is >> + * available. >> + */ >> + clk_bulk_data[0].clk = clkc_data->mod_clk_en.hw.clk; >> + clk_bulk_data[1].clk = clkc_data->sd_clk_en.hw.clk; >> + clk_bulk_data[2].clk = clkc_data->tx_clk_en.hw.clk; >> + clk_bulk_data[3].clk = clkc_data->rx_clk_en.hw.clk; >> + >> + return 0; >> +} >> diff --git a/drivers/mmc/host/meson-mx-sdhc.c b/drivers/mmc/host/meson-mx-sdhc.c >> new file mode 100644 >> index 000000000000..5c00958d7754 >> --- /dev/null >> +++ b/drivers/mmc/host/meson-mx-sdhc.c >> @@ -0,0 +1,907 @@ >> +// SPDX-License-Identifier: GPL-2.0+ >> +/* >> + * Amlogic Meson6/Meson8/Meson8b/Meson8m2 SDHC MMC host controller driver. >> + * >> + * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com> >> + */ >> + >> +#include <linux/clk.h> >> +#include <linux/device.h> >> +#include <linux/dma-mapping.h> >> +#include <linux/interrupt.h> >> +#include <linux/iopoll.h> >> +#include <linux/module.h> >> +#include <linux/of.h> >> +#include <linux/platform_device.h> >> +#include <linux/property.h> >> +#include <linux/regmap.h> >> +#include <linux/regulator/consumer.h> >> +#include <linux/types.h> >> + >> +#include <linux/mmc/host.h> >> +#include <linux/mmc/mmc.h> >> +#include <linux/mmc/sdio.h> >> +#include <linux/mmc/slot-gpio.h> >> + >> +#include "meson-mx-sdhc.h" >> + >> +#define MESON_SDHC_NUM_BULK_CLKS 4 >> +#define MESON_SDHC_MAX_BLK_SIZE 512 >> +#define MESON_SDHC_NUM_TUNING_TRIES 10 >> + >> +#define MESON_SDHC_WAIT_CMD_READY_SLEEP_US 1 >> +#define MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US 100000 >> +#define MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US 1 >> +#define MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US 200 >> + >> +struct meson_mx_sdhc_data { >> + void (*init_hw)(struct mmc_host *mmc); >> + void (*set_pdma)(struct mmc_host *mmc); >> + void (*wait_before_send)(struct mmc_host *mmc); >> + bool hardware_flush_all_cmds; >> +}; >> + >> +struct meson_mx_sdhc_host { >> + struct mmc_host *mmc; >> + >> + struct mmc_request *mrq; >> + struct mmc_command *cmd; >> + int error; >> + >> + struct regmap *regmap; >> + >> + struct clk *pclk; >> + struct clk *sd_clk; >> + struct clk_bulk_data bulk_clks[MESON_SDHC_NUM_BULK_CLKS]; >> + bool bulk_clks_enabled; >> + >> + const struct meson_mx_sdhc_data *platform; >> +}; >> + >> +static const struct regmap_config meson_mx_sdhc_regmap_config = { >> + .reg_bits = 8, >> + .val_bits = 32, >> + .reg_stride = 4, >> + .max_register = MESON_SDHC_CLK2, >> +}; >> + >> +static void meson_mx_sdhc_hw_reset(struct mmc_host *mmc) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + >> + regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_MAIN_CTRL | >> + MESON_SDHC_SRST_RXFIFO | MESON_SDHC_SRST_TXFIFO | >> + MESON_SDHC_SRST_DPHY_RX | MESON_SDHC_SRST_DPHY_TX | >> + MESON_SDHC_SRST_DMA_IF); >> + usleep_range(10, 100); >> + >> + regmap_write(host->regmap, MESON_SDHC_SRST, 0); >> + usleep_range(10, 100); >> +} >> + >> +static void meson_mx_sdhc_clear_fifo(struct mmc_host *mmc) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + u32 stat; >> + >> + regmap_read(host->regmap, MESON_SDHC_STAT, &stat); >> + if (!FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) && >> + !FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat)) >> + return; >> + >> + regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_RXFIFO | >> + MESON_SDHC_SRST_TXFIFO | MESON_SDHC_SRST_MAIN_CTRL); >> + udelay(5); >> + >> + regmap_read(host->regmap, MESON_SDHC_STAT, &stat); >> + if (FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) || >> + FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat)) >> + dev_warn(mmc_dev(host->mmc), >> + "Failed to clear FIFOs, RX: %lu, TX: %lu\n", >> + FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat), >> + FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat)); >> +} >> + >> +static void meson_mx_sdhc_wait_cmd_ready(struct mmc_host *mmc) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + u32 stat, esta; >> + int ret; >> + >> + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT, stat, >> + !(stat & MESON_SDHC_STAT_CMD_BUSY), >> + MESON_SDHC_WAIT_CMD_READY_SLEEP_US, >> + MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US); >> + if (ret) { >> + dev_warn(mmc_dev(mmc), >> + "Failed to poll for CMD_BUSY while processing CMD%d\n", >> + host->cmd->opcode); >> + meson_mx_sdhc_hw_reset(mmc); >> + } >> + >> + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, esta, >> + !(esta & MESON_SDHC_ESTA_11_13), >> + MESON_SDHC_WAIT_CMD_READY_SLEEP_US, >> + MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US); >> + if (ret) { >> + dev_warn(mmc_dev(mmc), >> + "Failed to poll for ESTA[13:11] while processing CMD%d\n", >> + host->cmd->opcode); >> + meson_mx_sdhc_hw_reset(mmc); >> + } >> +} >> + >> +static void meson_mx_sdhc_start_cmd(struct mmc_host *mmc, >> + struct mmc_command *cmd) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + u32 ictl, send; >> + int pack_len; >> + >> + host->cmd = cmd; >> + >> + ictl = MESON_SDHC_ICTL_DATA_TIMEOUT | MESON_SDHC_ICTL_DATA_ERR_CRC | >> + MESON_SDHC_ICTL_RXFIFO_FULL | MESON_SDHC_ICTL_TXFIFO_EMPTY | >> + MESON_SDHC_ICTL_RESP_TIMEOUT | MESON_SDHC_ICTL_RESP_ERR_CRC; >> + >> + send = FIELD_PREP(MESON_SDHC_SEND_CMD_INDEX, cmd->opcode); >> + >> + if (cmd->data) { >> + send |= MESON_SDHC_SEND_CMD_HAS_DATA; >> + send |= FIELD_PREP(MESON_SDHC_SEND_TOTAL_PACK, >> + cmd->data->blocks - 1); >> + >> + if (cmd->data->blksz < MESON_SDHC_MAX_BLK_SIZE) >> + pack_len = cmd->data->blksz; >> + else >> + pack_len = 0; >> + >> + if (cmd->data->flags & MMC_DATA_WRITE) >> + send |= MESON_SDHC_SEND_DATA_DIR; >> + >> + /* >> + * If command with no data, just wait response done >> + * interrupt(int[0]), and if command with data transfer, just >> + * wait dma done interrupt(int[11]), don't need care about >> + * dat0 busy or not. >> + */ >> + if (host->platform->hardware_flush_all_cmds || >> + cmd->data->flags & MMC_DATA_WRITE) >> + /* hardware flush: */ >> + ictl |= MESON_SDHC_ICTL_DMA_DONE; >> + else >> + /* software flush: */ >> + ictl |= MESON_SDHC_ICTL_DATA_XFER_OK; >> + } else { >> + pack_len = 0; >> + >> + ictl |= MESON_SDHC_ICTL_RESP_OK; >> + } >> + >> + if (cmd->opcode == MMC_STOP_TRANSMISSION) >> + send |= MESON_SDHC_SEND_DATA_STOP; >> + >> + if (cmd->flags & MMC_RSP_PRESENT) >> + send |= MESON_SDHC_SEND_CMD_HAS_RESP; >> + >> + if (cmd->flags & MMC_RSP_136) { >> + send |= MESON_SDHC_SEND_RESP_LEN; >> + send |= MESON_SDHC_SEND_RESP_NO_CRC; >> + } >> + >> + if (!(cmd->flags & MMC_RSP_CRC)) >> + send |= MESON_SDHC_SEND_RESP_NO_CRC; >> + >> + if (cmd->flags & MMC_RSP_BUSY) >> + send |= MESON_SDHC_SEND_R1B; >> + >> + /* enable the new IRQs and mask all pending ones */ >> + regmap_write(host->regmap, MESON_SDHC_ICTL, ictl); >> + regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS); >> + >> + regmap_write(host->regmap, MESON_SDHC_ARGU, cmd->arg); >> + >> + regmap_update_bits(host->regmap, MESON_SDHC_CTRL, >> + MESON_SDHC_CTRL_PACK_LEN, >> + FIELD_PREP(MESON_SDHC_CTRL_PACK_LEN, pack_len)); >> + >> + if (cmd->data) >> + regmap_write(host->regmap, MESON_SDHC_ADDR, >> + sg_dma_address(cmd->data->sg)); >> + >> + meson_mx_sdhc_wait_cmd_ready(mmc); >> + >> + if (cmd->data) >> + host->platform->set_pdma(mmc); >> + >> + if (host->platform->wait_before_send) >> + host->platform->wait_before_send(mmc); >> + >> + regmap_write(host->regmap, MESON_SDHC_SEND, send); >> +} >> + >> +static void meson_mx_sdhc_disable_clks(struct mmc_host *mmc) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + >> + if (!host->bulk_clks_enabled) >> + return; >> + >> + clk_bulk_disable_unprepare(MESON_SDHC_NUM_BULK_CLKS, host->bulk_clks); >> + >> + host->bulk_clks_enabled = false; >> +} >> + >> +static int meson_mx_sdhc_enable_clks(struct mmc_host *mmc) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + int ret; >> + >> + if (host->bulk_clks_enabled) >> + return 0; >> + >> + ret = clk_bulk_prepare_enable(MESON_SDHC_NUM_BULK_CLKS, >> + host->bulk_clks); >> + if (ret) >> + return ret; >> + >> + host->bulk_clks_enabled = true; >> + >> + return 0; >> +} >> + >> +static int meson_mx_sdhc_set_clk(struct mmc_host *mmc, struct mmc_ios *ios) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + u32 rx_clk_phase; >> + int ret; >> + >> + meson_mx_sdhc_disable_clks(mmc); >> + >> + if (ios->clock) { >> + ret = clk_set_rate(host->sd_clk, ios->clock); >> + if (ret) { >> + dev_warn(mmc_dev(mmc), >> + "Failed to set MMC clock to %uHz: %d\n", >> + ios->clock, host->error); >> + return ret; >> + } >> + >> + ret = meson_mx_sdhc_enable_clks(mmc); >> + if (ret) >> + return ret; >> + >> + mmc->actual_clock = clk_get_rate(host->sd_clk); >> + >> + /* >> + * according to Amlogic the following latching points are >> + * selected with empirical values, there is no (known) formula >> + * to calculate these. >> + */ >> + if (mmc->actual_clock > 100000000) { >> + rx_clk_phase = 1; >> + } else if (mmc->actual_clock > 45000000) { >> + if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) >> + rx_clk_phase = 15; >> + else >> + rx_clk_phase = 11; >> + } else if (mmc->actual_clock >= 25000000) { >> + rx_clk_phase = 15; >> + } else if (mmc->actual_clock > 5000000) { >> + rx_clk_phase = 23; >> + } else if (mmc->actual_clock > 1000000) { >> + rx_clk_phase = 55; >> + } else { >> + rx_clk_phase = 1061; >> + } >> + >> + regmap_update_bits(host->regmap, MESON_SDHC_CLK2, >> + MESON_SDHC_CLK2_RX_CLK_PHASE, >> + FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE, >> + rx_clk_phase)); >> + } else { >> + mmc->actual_clock = 0; >> + } >> + >> + return 0; >> +} >> + >> +static void meson_mx_sdhc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + unsigned short vdd = ios->vdd; >> + >> + switch (ios->power_mode) { >> + case MMC_POWER_OFF: >> + vdd = 0; >> + fallthrough; >> + >> + case MMC_POWER_UP: >> + if (!IS_ERR(mmc->supply.vmmc)) { >> + host->error = mmc_regulator_set_ocr(mmc, >> + mmc->supply.vmmc, >> + vdd); >> + if (host->error) >> + return; >> + } >> + >> + break; >> + >> + case MMC_POWER_ON: >> + break; >> + } >> + >> + host->error = meson_mx_sdhc_set_clk(mmc, ios); >> + if (host->error) >> + return; >> + >> + switch (ios->bus_width) { >> + case MMC_BUS_WIDTH_1: >> + regmap_update_bits(host->regmap, MESON_SDHC_CTRL, >> + MESON_SDHC_CTRL_DAT_TYPE, >> + FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 0)); >> + break; >> + >> + case MMC_BUS_WIDTH_4: >> + regmap_update_bits(host->regmap, MESON_SDHC_CTRL, >> + MESON_SDHC_CTRL_DAT_TYPE, >> + FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 1)); >> + break; >> + >> + case MMC_BUS_WIDTH_8: >> + regmap_update_bits(host->regmap, MESON_SDHC_CTRL, >> + MESON_SDHC_CTRL_DAT_TYPE, >> + FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 2)); >> + break; >> + >> + default: >> + dev_err(mmc_dev(mmc), "unsupported bus width: %d\n", >> + ios->bus_width); >> + host->error = -EINVAL; >> + return; >> + } >> +} >> + >> +static int meson_mx_sdhc_map_dma(struct mmc_host *mmc, struct mmc_request *mrq) >> +{ >> + struct mmc_data *data = mrq->data; >> + int dma_len; >> + >> + if (!data) >> + return 0; >> + >> + dma_len = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len, >> + mmc_get_dma_dir(data)); >> + if (dma_len <= 0) { >> + dev_err(mmc_dev(mmc), "dma_map_sg failed\n"); >> + return -ENOMEM; >> + } >> + >> + return 0; >> +} >> + >> +static void meson_mx_sdhc_request(struct mmc_host *mmc, struct mmc_request *mrq) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + struct mmc_command *cmd = mrq->cmd; >> + >> + if (!host->error) >> + host->error = meson_mx_sdhc_map_dma(mmc, mrq); >> + >> + if (host->error) { >> + cmd->error = host->error; >> + mmc_request_done(mmc, mrq); >> + return; >> + } >> + >> + host->mrq = mrq; >> + >> + meson_mx_sdhc_start_cmd(mmc, mrq->cmd); >> +} >> + >> +static int meson_mx_sdhc_card_busy(struct mmc_host *mmc) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + u32 stat; >> + >> + regmap_read(host->regmap, MESON_SDHC_STAT, &stat); >> + return FIELD_GET(MESON_SDHC_STAT_DAT3_0, stat) == 0; >> +} >> + >> +static bool meson_mx_sdhc_tuning_point_matches(struct mmc_host *mmc, >> + u32 opcode) >> +{ >> + unsigned int i, num_matches = 0; >> + int ret; >> + >> + for (i = 0; i < MESON_SDHC_NUM_TUNING_TRIES; i++) { >> + ret = mmc_send_tuning(mmc, opcode, NULL); >> + if (!ret) >> + num_matches++; >> + } >> + >> + return num_matches == MESON_SDHC_NUM_TUNING_TRIES; >> +} >> + >> +static int meson_mx_sdhc_execute_tuning(struct mmc_host *mmc, u32 opcode) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + int div, start, len, best_start, best_len; >> + int curr_phase, old_phase, new_phase; >> + u32 val; >> + >> + len = 0; >> + start = 0; >> + best_len = 0; >> + >> + regmap_read(host->regmap, MESON_SDHC_CLK2, &val); >> + old_phase = FIELD_GET(MESON_SDHC_CLK2_RX_CLK_PHASE, val); >> + >> + regmap_read(host->regmap, MESON_SDHC_CLKC, &val); >> + div = FIELD_GET(MESON_SDHC_CLKC_CLK_DIV, val); >> + >> + for (curr_phase = 0; curr_phase <= div; curr_phase++) { >> + regmap_update_bits(host->regmap, MESON_SDHC_CLK2, >> + MESON_SDHC_CLK2_RX_CLK_PHASE, >> + FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE, >> + curr_phase)); >> + >> + if (meson_mx_sdhc_tuning_point_matches(mmc, opcode)) { >> + if (!len) { >> + start = curr_phase; >> + >> + dev_dbg(mmc_dev(mmc), >> + "New RX phase window starts at %u\n", >> + start); >> + } >> + >> + len++; >> + } else { >> + if (len > best_len) { >> + best_start = start; >> + best_len = len; >> + >> + dev_dbg(mmc_dev(mmc), >> + "New best RX phase window: %u - %u\n", >> + best_start, best_start + best_len); >> + } >> + >> + /* reset the current window */ >> + len = 0; >> + } >> + } >> + >> + if (len > best_len) >> + /* the last window is the best (or possibly only) window */ >> + new_phase = start + (len / 2); >> + else if (best_len) >> + /* there was a better window than the last */ >> + new_phase = best_start + (best_len / 2); >> + else >> + /* no window was found at all, reset to the original phase */ >> + new_phase = old_phase; >> + >> + regmap_update_bits(host->regmap, MESON_SDHC_CLK2, >> + MESON_SDHC_CLK2_RX_CLK_PHASE, >> + FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE, >> + new_phase)); >> + >> + if (!len && !best_len) >> + return -EIO; >> + >> + dev_dbg(mmc_dev(mmc), "Tuned RX clock phase to %u\n", new_phase); >> + >> + return 0; >> +} >> + >> +static const struct mmc_host_ops meson_mx_sdhc_ops = { >> + .hw_reset = meson_mx_sdhc_hw_reset, >> + .request = meson_mx_sdhc_request, >> + .set_ios = meson_mx_sdhc_set_ios, >> + .card_busy = meson_mx_sdhc_card_busy, >> + .execute_tuning = meson_mx_sdhc_execute_tuning, >> + .get_cd = mmc_gpio_get_cd, >> + .get_ro = mmc_gpio_get_ro, >> +}; >> + >> +static void meson_mx_sdhc_request_done(struct meson_mx_sdhc_host *host) >> +{ >> + struct mmc_request *mrq = host->mrq; >> + struct mmc_host *mmc = host->mmc; >> + >> + /* disable interrupts and mask all pending ones */ >> + regmap_update_bits(host->regmap, MESON_SDHC_ICTL, >> + MESON_SDHC_ICTL_ALL_IRQS, 0); >> + regmap_update_bits(host->regmap, MESON_SDHC_ISTA, >> + MESON_SDHC_ISTA_ALL_IRQS, MESON_SDHC_ISTA_ALL_IRQS); >> + >> + host->mrq = NULL; >> + host->cmd = NULL; >> + >> + mmc_request_done(mmc, mrq); >> +} >> + >> +static u32 meson_mx_sdhc_read_response(struct meson_mx_sdhc_host *host, u8 idx) >> +{ >> + u32 val; >> + >> + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, >> + MESON_SDHC_PDMA_DMA_MODE, 0); >> + >> + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, >> + MESON_SDHC_PDMA_PIO_RDRESP, >> + FIELD_PREP(MESON_SDHC_PDMA_PIO_RDRESP, idx)); >> + >> + regmap_read(host->regmap, MESON_SDHC_ARGU, &val); >> + >> + return val; >> +} >> + >> +static irqreturn_t meson_mx_sdhc_irq(int irq, void *data) >> +{ >> + struct meson_mx_sdhc_host *host = data; >> + struct mmc_command *cmd = host->cmd; >> + u32 ictl, ista; >> + >> + regmap_read(host->regmap, MESON_SDHC_ICTL, &ictl); >> + regmap_read(host->regmap, MESON_SDHC_ISTA, &ista); >> + >> + if (!(ictl & ista)) >> + return IRQ_NONE; >> + >> + if (ista & MESON_SDHC_ISTA_RXFIFO_FULL || >> + ista & MESON_SDHC_ISTA_TXFIFO_EMPTY) >> + cmd->error = -EIO; >> + else if (ista & MESON_SDHC_ISTA_RESP_ERR_CRC) >> + cmd->error = -EILSEQ; >> + else if (ista & MESON_SDHC_ISTA_RESP_TIMEOUT) >> + cmd->error = -ETIMEDOUT; >> + >> + if (cmd->data) { >> + if (ista & MESON_SDHC_ISTA_DATA_ERR_CRC) >> + cmd->data->error = -EILSEQ; >> + else if (ista & MESON_SDHC_ISTA_DATA_TIMEOUT) >> + cmd->data->error = -ETIMEDOUT; >> + } >> + >> + if (cmd->error || (cmd->data && cmd->data->error)) >> + dev_dbg(mmc_dev(host->mmc), "CMD%d error, ISTA: 0x%08x\n", >> + cmd->opcode, ista); >> + >> + return IRQ_WAKE_THREAD; >> +} >> + >> +static irqreturn_t meson_mx_sdhc_irq_thread(int irq, void *irq_data) >> +{ >> + struct meson_mx_sdhc_host *host = irq_data; >> + struct mmc_command *cmd; >> + u32 val; >> + >> + cmd = host->cmd; >> + if (WARN_ON(!cmd)) >> + return IRQ_HANDLED; >> + >> + if (cmd->data && !cmd->data->error) { >> + if (!host->platform->hardware_flush_all_cmds && >> + cmd->data->flags & MMC_DATA_READ) { >> + meson_mx_sdhc_wait_cmd_ready(host->mmc); >> + >> + val = FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, >> + 2); >> + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, >> + MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, >> + val); >> + } >> + >> + dma_unmap_sg(mmc_dev(host->mmc), cmd->data->sg, >> + cmd->data->sg_len, mmc_get_dma_dir(cmd->data)); >> + >> + cmd->data->bytes_xfered = cmd->data->blksz * cmd->data->blocks; >> + } >> + >> + meson_mx_sdhc_wait_cmd_ready(host->mmc); >> + >> + if (cmd->flags & MMC_RSP_136) { >> + cmd->resp[0] = meson_mx_sdhc_read_response(host, 4); >> + cmd->resp[1] = meson_mx_sdhc_read_response(host, 3); >> + cmd->resp[2] = meson_mx_sdhc_read_response(host, 2); >> + cmd->resp[3] = meson_mx_sdhc_read_response(host, 1); >> + } else { >> + cmd->resp[0] = meson_mx_sdhc_read_response(host, 0); >> + } >> + >> + if (cmd->error == -EIO || cmd->error == -ETIMEDOUT) >> + meson_mx_sdhc_hw_reset(host->mmc); >> + else if (cmd->data) >> + /* >> + * Clear the FIFOs after completing data transfers to prevent >> + * corrupting data on write access. It's not clear why this is >> + * needed (for reads and writes), but it mimics what the BSP >> + * kernel did. >> + */ >> + meson_mx_sdhc_clear_fifo(host->mmc); >> + >> + meson_mx_sdhc_request_done(host); >> + >> + return IRQ_HANDLED; >> +} >> + >> +static void meson_mx_sdhc_init_hw_meson8(struct mmc_host *mmc) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + >> + regmap_write(host->regmap, MESON_SDHC_MISC, >> + FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 7) | >> + FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) | >> + FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2)); >> + >> + regmap_write(host->regmap, MESON_SDHC_ENHC, >> + FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 63) | >> + MESON_SDHC_ENHC_MESON6_DMA_WR_RESP | >> + FIELD_PREP(MESON_SDHC_ENHC_MESON6_RX_TIMEOUT, 255) | >> + FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12)); >> +}; >> + >> +static void meson_mx_sdhc_set_pdma_meson8(struct mmc_host *mmc) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + >> + if (host->cmd->data->flags & MMC_DATA_WRITE) >> + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, >> + MESON_SDHC_PDMA_DMA_MODE | >> + MESON_SDHC_PDMA_RD_BURST | >> + MESON_SDHC_PDMA_TXFIFO_FILL, >> + MESON_SDHC_PDMA_DMA_MODE | >> + FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 31) | >> + MESON_SDHC_PDMA_TXFIFO_FILL); >> + else >> + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, >> + MESON_SDHC_PDMA_DMA_MODE | >> + MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, >> + MESON_SDHC_PDMA_DMA_MODE | >> + FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, >> + 1)); >> + >> + if (host->cmd->data->flags & MMC_DATA_WRITE) >> + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, >> + MESON_SDHC_PDMA_RD_BURST, >> + FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15)); >> +} >> + >> +static void meson_mx_sdhc_wait_before_send_meson8(struct mmc_host *mmc) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + u32 val; >> + int ret; >> + >> + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, val, >> + val == 0, >> + MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US, >> + MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US); >> + if (ret) >> + dev_warn(mmc_dev(mmc), >> + "Failed to wait for ESTA to clear: 0x%08x\n", val); >> + >> + if (host->cmd->data && host->cmd->data->flags & MMC_DATA_WRITE) { >> + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT, >> + val, val & MESON_SDHC_STAT_TXFIFO_CNT, >> + MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US, >> + MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US); >> + if (ret) >> + dev_warn(mmc_dev(mmc), >> + "Failed to wait for TX FIFO to fill\n"); >> + } >> +} >> + >> +static void meson_mx_sdhc_init_hw_meson8m2(struct mmc_host *mmc) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + >> + regmap_write(host->regmap, MESON_SDHC_MISC, >> + FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 6) | >> + FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) | >> + FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2)); >> + >> + regmap_write(host->regmap, MESON_SDHC_ENHC, >> + FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 64) | >> + FIELD_PREP(MESON_SDHC_ENHC_MESON8M2_DEBUG, 1) | >> + MESON_SDHC_ENHC_MESON8M2_WRRSP_MODE | >> + FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12)); >> +} >> + >> +static void meson_mx_sdhc_set_pdma_meson8m2(struct mmc_host *mmc) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + >> + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, >> + MESON_SDHC_PDMA_DMA_MODE, MESON_SDHC_PDMA_DMA_MODE); >> +} >> + >> +static void meson_mx_sdhc_init_hw(struct mmc_host *mmc) >> +{ >> + struct meson_mx_sdhc_host *host = mmc_priv(mmc); >> + >> + meson_mx_sdhc_hw_reset(mmc); >> + >> + regmap_write(host->regmap, MESON_SDHC_CTRL, >> + FIELD_PREP(MESON_SDHC_CTRL_RX_PERIOD, 0xf) | >> + FIELD_PREP(MESON_SDHC_CTRL_RX_TIMEOUT, 0x7f) | >> + FIELD_PREP(MESON_SDHC_CTRL_RX_ENDIAN, 0x7) | >> + FIELD_PREP(MESON_SDHC_CTRL_TX_ENDIAN, 0x7)); >> + >> + /* >> + * start with a valid divider and enable the memory (un-setting >> + * MESON_SDHC_CLKC_MEM_PWR_OFF). >> + */ >> + regmap_write(host->regmap, MESON_SDHC_CLKC, MESON_SDHC_CLKC_CLK_DIV); >> + >> + regmap_write(host->regmap, MESON_SDHC_CLK2, >> + FIELD_PREP(MESON_SDHC_CLK2_SD_CLK_PHASE, 1)); >> + >> + regmap_write(host->regmap, MESON_SDHC_PDMA, >> + MESON_SDHC_PDMA_DMA_URGENT | >> + FIELD_PREP(MESON_SDHC_PDMA_WR_BURST, 7) | >> + FIELD_PREP(MESON_SDHC_PDMA_TXFIFO_TH, 49) | >> + FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15) | >> + FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_TH, 7)); >> + >> + /* some initialization bits depend on the SoC: */ >> + host->platform->init_hw(mmc); >> + >> + /* disable and mask all interrupts: */ >> + regmap_write(host->regmap, MESON_SDHC_ICTL, 0); >> + regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS); >> +} >> + >> +static int meson_mx_sdhc_probe(struct platform_device *pdev) >> +{ >> + struct device *dev = &pdev->dev; >> + struct meson_mx_sdhc_host *host; >> + struct mmc_host *mmc; >> + void __iomem *base; >> + int ret, irq; >> + >> + mmc = mmc_alloc_host(sizeof(*host), dev); >> + if (!mmc) >> + return -ENOMEM; >> + >> + ret = devm_add_action_or_reset(dev, (void(*)(void *))mmc_free_host, >> + mmc); >> + if (ret) { >> + dev_err(dev, "Failed to register mmc_free_host action\n"); >> + return ret; >> + } >> + >> + host = mmc_priv(mmc); >> + host->mmc = mmc; >> + >> + platform_set_drvdata(pdev, host); >> + >> + host->platform = device_get_match_data(dev); >> + if (!host->platform) >> + return -EINVAL; >> + >> + base = devm_platform_ioremap_resource(pdev, 0); >> + if (IS_ERR(base)) >> + return PTR_ERR(base); >> + >> + host->regmap = devm_regmap_init_mmio(dev, base, >> + &meson_mx_sdhc_regmap_config); >> + if (IS_ERR(host->regmap)) >> + return PTR_ERR(host->regmap); >> + >> + host->pclk = devm_clk_get(dev, "pclk"); >> + if (IS_ERR(host->pclk)) >> + return PTR_ERR(host->pclk); >> + >> + /* accessing any register requires the module clock to be enabled: */ >> + ret = clk_prepare_enable(host->pclk); >> + if (ret) { >> + dev_err(dev, "Failed to enable 'pclk' clock\n"); >> + return ret; >> + } >> + >> + meson_mx_sdhc_init_hw(mmc); >> + >> + ret = meson_mx_sdhc_register_clkc(dev, base, host->bulk_clks); >> + if (ret) >> + goto err_disable_pclk; >> + >> + host->sd_clk = host->bulk_clks[1].clk; >> + >> + /* Get regulators and the supported OCR mask */ >> + ret = mmc_regulator_get_supply(mmc); >> + if (ret) >> + goto err_disable_pclk; >> + >> + mmc->max_req_size = SZ_128K; >> + mmc->max_seg_size = mmc->max_req_size; >> + mmc->max_blk_count = FIELD_GET(MESON_SDHC_SEND_TOTAL_PACK, ~0); >> + mmc->max_blk_size = MESON_SDHC_MAX_BLK_SIZE; >> + mmc->max_busy_timeout = 30 * MSEC_PER_SEC; >> + mmc->f_min = clk_round_rate(host->sd_clk, 1); >> + mmc->f_max = clk_round_rate(host->sd_clk, ULONG_MAX); >> + mmc->max_current_180 = 300; >> + mmc->max_current_330 = 300; >> + mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_HW_RESET; >> + mmc->ops = &meson_mx_sdhc_ops; >> + >> + ret = mmc_of_parse(mmc); >> + if (ret) >> + goto err_disable_pclk; >> + >> + irq = platform_get_irq(pdev, 0); >> + ret = devm_request_threaded_irq(dev, irq, meson_mx_sdhc_irq, >> + meson_mx_sdhc_irq_thread, IRQF_ONESHOT, >> + NULL, host); >> + if (ret) >> + goto err_disable_pclk; >> + >> + ret = mmc_add_host(mmc); >> + if (ret) >> + goto err_disable_pclk; >> + >> + return 0; >> + >> +err_disable_pclk: >> + clk_disable_unprepare(host->pclk); >> + return ret; >> +} >> + >> +static int meson_mx_sdhc_remove(struct platform_device *pdev) >> +{ >> + struct meson_mx_sdhc_host *host = platform_get_drvdata(pdev); >> + >> + mmc_remove_host(host->mmc); >> + >> + meson_mx_sdhc_disable_clks(host->mmc); >> + >> + clk_disable_unprepare(host->pclk); >> + >> + return 0; >> +} >> + >> +static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8 = { >> + .init_hw = meson_mx_sdhc_init_hw_meson8, >> + .set_pdma = meson_mx_sdhc_set_pdma_meson8, >> + .wait_before_send = meson_mx_sdhc_wait_before_send_meson8, >> + .hardware_flush_all_cmds = false, >> +}; >> + >> +static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8m2 = { >> + .init_hw = meson_mx_sdhc_init_hw_meson8m2, >> + .set_pdma = meson_mx_sdhc_set_pdma_meson8m2, >> + .hardware_flush_all_cmds = true, >> +}; >> + >> +static const struct of_device_id meson_mx_sdhc_of_match[] = { >> + { >> + .compatible = "amlogic,meson8-sdhc", >> + .data = &meson_mx_sdhc_data_meson8 >> + }, >> + { >> + .compatible = "amlogic,meson8b-sdhc", >> + .data = &meson_mx_sdhc_data_meson8 >> + }, >> + { >> + .compatible = "amlogic,meson8m2-sdhc", >> + .data = &meson_mx_sdhc_data_meson8m2 >> + }, >> + { /* sentinel */ } >> +}; >> +MODULE_DEVICE_TABLE(of, meson_mx_sdhc_of_match); >> + >> +static struct platform_driver meson_mx_sdhc_driver = { >> + .probe = meson_mx_sdhc_probe, >> + .remove = meson_mx_sdhc_remove, >> + .driver = { >> + .name = "meson-mx-sdhc", >> + .of_match_table = of_match_ptr(meson_mx_sdhc_of_match), >> + }, >> +}; >> + >> +module_platform_driver(meson_mx_sdhc_driver); >> + >> +MODULE_DESCRIPTION("Meson6, Meson8, Meson8b and Meson8m2 SDHC Host Driver"); >> +MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>"); >> +MODULE_LICENSE("GPL v2"); >> diff --git a/drivers/mmc/host/meson-mx-sdhc.h b/drivers/mmc/host/meson-mx-sdhc.h >> new file mode 100644 >> index 000000000000..230e8fbe6b3f >> --- /dev/null >> +++ b/drivers/mmc/host/meson-mx-sdhc.h >> @@ -0,0 +1,141 @@ >> +/* SPDX-License-Identifier: GPL-2.0+ */ >> +/* >> + * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com> >> + */ >> + >> +#ifndef _MESON_MX_SDHC_H_ >> +#define _MESON_MX_SDHC_H_ >> + >> +#include <linux/bitfield.h> >> + >> +#define MESON_SDHC_ARGU 0x00 >> + >> +#define MESON_SDHC_SEND 0x04 >> + #define MESON_SDHC_SEND_CMD_INDEX GENMASK(5, 0) >> + #define MESON_SDHC_SEND_CMD_HAS_RESP BIT(6) >> + #define MESON_SDHC_SEND_CMD_HAS_DATA BIT(7) >> + #define MESON_SDHC_SEND_RESP_LEN BIT(8) >> + #define MESON_SDHC_SEND_RESP_NO_CRC BIT(9) >> + #define MESON_SDHC_SEND_DATA_DIR BIT(10) >> + #define MESON_SDHC_SEND_DATA_STOP BIT(11) >> + #define MESON_SDHC_SEND_R1B BIT(12) >> + #define MESON_SDHC_SEND_TOTAL_PACK GENMASK(31, 16) >> + >> +#define MESON_SDHC_CTRL 0x08 >> + #define MESON_SDHC_CTRL_DAT_TYPE GENMASK(1, 0) >> + #define MESON_SDHC_CTRL_DDR_MODE BIT(2) >> + #define MESON_SDHC_CTRL_TX_CRC_NOCHECK BIT(3) >> + #define MESON_SDHC_CTRL_PACK_LEN GENMASK(12, 4) >> + #define MESON_SDHC_CTRL_RX_TIMEOUT GENMASK(19, 13) >> + #define MESON_SDHC_CTRL_RX_PERIOD GENMASK(23, 20) >> + #define MESON_SDHC_CTRL_RX_ENDIAN GENMASK(26, 24) >> + #define MESON_SDHC_CTRL_SDIO_IRQ_MODE BIT(27) >> + #define MESON_SDHC_CTRL_DAT0_IRQ_SEL BIT(28) >> + #define MESON_SDHC_CTRL_TX_ENDIAN GENMASK(31, 29) >> + >> +#define MESON_SDHC_STAT 0x0c >> + #define MESON_SDHC_STAT_CMD_BUSY BIT(0) >> + #define MESON_SDHC_STAT_DAT3_0 GENMASK(4, 1) >> + #define MESON_SDHC_STAT_CMD BIT(5) >> + #define MESON_SDHC_STAT_RXFIFO_CNT GENMASK(12, 6) >> + #define MESON_SDHC_STAT_TXFIFO_CNT GENMASK(19, 13) >> + #define MESON_SDHC_STAT_DAT7_4 GENMASK(23, 20) >> + >> +#define MESON_SDHC_CLKC 0x10 >> + #define MESON_SDHC_CLKC_CLK_DIV GENMASK(11, 0) >> + #define MESON_SDHC_CLKC_CLK_JIC BIT(24) >> + #define MESON_SDHC_CLKC_MEM_PWR_OFF GENMASK(26, 25) >> + >> +#define MESON_SDHC_ADDR 0x14 >> + >> +#define MESON_SDHC_PDMA 0x18 >> + #define MESON_SDHC_PDMA_DMA_MODE BIT(0) >> + #define MESON_SDHC_PDMA_PIO_RDRESP GENMASK(3, 1) >> + #define MESON_SDHC_PDMA_DMA_URGENT BIT(4) >> + #define MESON_SDHC_PDMA_WR_BURST GENMASK(9, 5) >> + #define MESON_SDHC_PDMA_RD_BURST GENMASK(14, 10) >> + #define MESON_SDHC_PDMA_RXFIFO_TH GENMASK(21, 15) >> + #define MESON_SDHC_PDMA_TXFIFO_TH GENMASK(28, 22) >> + #define MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH GENMASK(30, 29) >> + #define MESON_SDHC_PDMA_TXFIFO_FILL BIT(31) >> + >> +#define MESON_SDHC_MISC 0x1c >> + #define MESON_SDHC_MISC_WCRC_ERR_PATT GENMASK(6, 4) >> + #define MESON_SDHC_MISC_WCRC_OK_PATT GENMASK(9, 7) >> + #define MESON_SDHC_MISC_BURST_NUM GENMASK(21, 16) >> + #define MESON_SDHC_MISC_THREAD_ID GENMASK(27, 22) >> + #define MESON_SDHC_MISC_MANUAL_STOP BIT(28) >> + #define MESON_SDHC_MISC_TXSTART_THRES GENMASK(31, 29) >> + >> +#define MESON_SDHC_DATA 0x20 >> + >> +#define MESON_SDHC_ICTL 0x24 >> + #define MESON_SDHC_ICTL_RESP_OK BIT(0) >> + #define MESON_SDHC_ICTL_RESP_TIMEOUT BIT(1) >> + #define MESON_SDHC_ICTL_RESP_ERR_CRC BIT(2) >> + #define MESON_SDHC_ICTL_RESP_OK_NOCLEAR BIT(3) >> + #define MESON_SDHC_ICTL_DATA_1PACK_OK BIT(4) >> + #define MESON_SDHC_ICTL_DATA_TIMEOUT BIT(5) >> + #define MESON_SDHC_ICTL_DATA_ERR_CRC BIT(6) >> + #define MESON_SDHC_ICTL_DATA_XFER_OK BIT(7) >> + #define MESON_SDHC_ICTL_RX_HIGHER BIT(8) >> + #define MESON_SDHC_ICTL_RX_LOWER BIT(9) >> + #define MESON_SDHC_ICTL_DAT1_IRQ BIT(10) >> + #define MESON_SDHC_ICTL_DMA_DONE BIT(11) >> + #define MESON_SDHC_ICTL_RXFIFO_FULL BIT(12) >> + #define MESON_SDHC_ICTL_TXFIFO_EMPTY BIT(13) >> + #define MESON_SDHC_ICTL_ADDI_DAT1_IRQ BIT(14) >> + #define MESON_SDHC_ICTL_ALL_IRQS GENMASK(14, 0) >> + #define MESON_SDHC_ICTL_DAT1_IRQ_DELAY GENMASK(17, 16) >> + >> +#define MESON_SDHC_ISTA 0x28 >> + #define MESON_SDHC_ISTA_RESP_OK BIT(0) >> + #define MESON_SDHC_ISTA_RESP_TIMEOUT BIT(1) >> + #define MESON_SDHC_ISTA_RESP_ERR_CRC BIT(2) >> + #define MESON_SDHC_ISTA_RESP_OK_NOCLEAR BIT(3) >> + #define MESON_SDHC_ISTA_DATA_1PACK_OK BIT(4) >> + #define MESON_SDHC_ISTA_DATA_TIMEOUT BIT(5) >> + #define MESON_SDHC_ISTA_DATA_ERR_CRC BIT(6) >> + #define MESON_SDHC_ISTA_DATA_XFER_OK BIT(7) >> + #define MESON_SDHC_ISTA_RX_HIGHER BIT(8) >> + #define MESON_SDHC_ISTA_RX_LOWER BIT(9) >> + #define MESON_SDHC_ISTA_DAT1_IRQ BIT(10) >> + #define MESON_SDHC_ISTA_DMA_DONE BIT(11) >> + #define MESON_SDHC_ISTA_RXFIFO_FULL BIT(12) >> + #define MESON_SDHC_ISTA_TXFIFO_EMPTY BIT(13) >> + #define MESON_SDHC_ISTA_ADDI_DAT1_IRQ BIT(14) >> + #define MESON_SDHC_ISTA_ALL_IRQS GENMASK(14, 0) >> + >> +#define MESON_SDHC_SRST 0x2c >> + #define MESON_SDHC_SRST_MAIN_CTRL BIT(0) >> + #define MESON_SDHC_SRST_RXFIFO BIT(1) >> + #define MESON_SDHC_SRST_TXFIFO BIT(2) >> + #define MESON_SDHC_SRST_DPHY_RX BIT(3) >> + #define MESON_SDHC_SRST_DPHY_TX BIT(4) >> + #define MESON_SDHC_SRST_DMA_IF BIT(5) >> + >> +#define MESON_SDHC_ESTA 0x30 >> + #define MESON_SDHC_ESTA_11_13 GENMASK(13, 11) >> + >> +#define MESON_SDHC_ENHC 0x34 >> + #define MESON_SDHC_ENHC_MESON8M2_WRRSP_MODE BIT(0) >> + #define MESON_SDHC_ENHC_MESON8M2_CHK_WRRSP BIT(1) >> + #define MESON_SDHC_ENHC_MESON8M2_CHK_DMA BIT(2) >> + #define MESON_SDHC_ENHC_MESON8M2_DEBUG GENMASK(5, 3) >> + #define MESON_SDHC_ENHC_MESON6_RX_TIMEOUT GENMASK(7, 0) >> + #define MESON_SDHC_ENHC_MESON6_DMA_RD_RESP BIT(16) >> + #define MESON_SDHC_ENHC_MESON6_DMA_WR_RESP BIT(17) >> + #define MESON_SDHC_ENHC_SDIO_IRQ_PERIOD GENMASK(15, 8) >> + #define MESON_SDHC_ENHC_RXFIFO_TH GENMASK(24, 18) >> + #define MESON_SDHC_ENHC_TXFIFO_TH GENMASK(31, 25) >> + >> +#define MESON_SDHC_CLK2 0x38 >> + #define MESON_SDHC_CLK2_RX_CLK_PHASE GENMASK(11, 0) >> + #define MESON_SDHC_CLK2_SD_CLK_PHASE GENMASK(23, 12) >> + >> +struct clk_bulk_data; >> + >> +int meson_mx_sdhc_register_clkc(struct device *dev, void __iomem *base, >> + struct clk_bulk_data *clk_bulk_data); >> + >> +#endif /* _MESON_MX_SDHC_H_ */ >> -- >> 2.26.2 >>
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index 462b5352fea7..df3fc572f842 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -405,6 +405,20 @@ config MMC_MESON_GX If you have a controller with this interface, say Y here. +config MMC_MESON_MX_SDHC + tristate "Amlogic Meson SDHC Host Controller support" + depends on (ARM && ARCH_MESON) || COMPILE_TEST + depends on COMMON_CLK + depends on OF + help + This selects support for the SDHC Host Controller on + Amlogic Meson6, Meson8, Meson8b and Meson8m2 SoCs. + The controller supports the SD/SDIO Spec 3.x and eMMC Spec 4.5x + with 1, 4, and 8 bit bus widths. + + If you have a controller with this interface, say Y or M here. + If unsure, say N. + config MMC_MESON_MX_SDIO tristate "Amlogic Meson6/Meson8/Meson8b SD/MMC Host Controller support" depends on ARCH_MESON || COMPILE_TEST diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index b929ef941208..8bcb420e071c 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile @@ -68,6 +68,7 @@ obj-$(CONFIG_MMC_VUB300) += vub300.o obj-$(CONFIG_MMC_USHC) += ushc.o obj-$(CONFIG_MMC_WMT) += wmt-sdmmc.o obj-$(CONFIG_MMC_MESON_GX) += meson-gx-mmc.o +obj-$(CONFIG_MMC_MESON_MX_SDHC) += meson-mx-sdhc-clkc.o meson-mx-sdhc.o obj-$(CONFIG_MMC_MESON_MX_SDIO) += meson-mx-sdio.o obj-$(CONFIG_MMC_MOXART) += moxart-mmc.o obj-$(CONFIG_MMC_SUNXI) += sunxi-mmc.o diff --git a/drivers/mmc/host/meson-mx-sdhc-clkc.c b/drivers/mmc/host/meson-mx-sdhc-clkc.c new file mode 100644 index 000000000000..ab0d6c68a078 --- /dev/null +++ b/drivers/mmc/host/meson-mx-sdhc-clkc.c @@ -0,0 +1,158 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Amlogic Meson SDHC clock controller + * + * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com> + */ + +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/device.h> +#include <linux/platform_device.h> + +#include "meson-mx-sdhc.h" + +#define MESON_SDHC_NUM_BUILTIN_CLKS 6 + +struct meson_mx_sdhc_clkc { + struct clk_mux src_sel; + struct clk_divider div; + struct clk_gate mod_clk_en; + struct clk_gate tx_clk_en; + struct clk_gate rx_clk_en; + struct clk_gate sd_clk_en; +}; + +static const struct clk_parent_data meson_mx_sdhc_src_sel_parents[4] = { + { .fw_name = "clkin0" }, + { .fw_name = "clkin1" }, + { .fw_name = "clkin2" }, + { .fw_name = "clkin3" }, +}; + +static const struct clk_div_table meson_mx_sdhc_div_table[] = { + { .div = 6, .val = 5, }, + { .div = 8, .val = 7, }, + { .div = 9, .val = 8, }, + { .div = 10, .val = 9, }, + { .div = 12, .val = 11, }, + { .div = 16, .val = 15, }, + { .div = 18, .val = 17, }, + { .div = 34, .val = 33, }, + { .div = 142, .val = 141, }, + { .div = 850, .val = 849, }, + { .div = 2126, .val = 2125, }, + { .div = 4096, .val = 4095, }, + { /* sentinel */ } +}; + +static int meson_mx_sdhc_clk_hw_register(struct device *dev, + const char *name_suffix, + const struct clk_parent_data *parents, + unsigned int num_parents, + const struct clk_ops *ops, + struct clk_hw *hw) +{ + struct clk_init_data init = { 0 }; + char clk_name[32]; + + snprintf(clk_name, sizeof(clk_name), "%s#%s", dev_name(dev), + name_suffix); + + init.name = clk_name; + init.ops = ops; + init.flags = CLK_SET_RATE_PARENT; + init.parent_data = parents; + init.num_parents = num_parents; + + hw->init = &init; + + return devm_clk_hw_register(dev, hw); +} + +static int meson_mx_sdhc_gate_clk_hw_register(struct device *dev, + const char *name_suffix, + struct clk_hw *parent, + struct clk_hw *hw) +{ + struct clk_parent_data parent_data = { .hw = parent }; + + return meson_mx_sdhc_clk_hw_register(dev, name_suffix, &parent_data, 1, + &clk_gate_ops, hw); +} + +int meson_mx_sdhc_register_clkc(struct device *dev, void __iomem *base, + struct clk_bulk_data *clk_bulk_data) +{ + struct clk_parent_data div_parent = { 0 }; + struct meson_mx_sdhc_clkc *clkc_data; + int ret; + + clkc_data = devm_kzalloc(dev, sizeof(*clkc_data), GFP_KERNEL); + if (!clkc_data) + return -ENOMEM; + + clkc_data->src_sel.reg = base + MESON_SDHC_CLKC; + clkc_data->src_sel.mask = 0x3; + clkc_data->src_sel.shift = 16; + ret = meson_mx_sdhc_clk_hw_register(dev, "src_sel", + meson_mx_sdhc_src_sel_parents, 4, + &clk_mux_ops, + &clkc_data->src_sel.hw); + if (ret) + return ret; + + clkc_data->div.reg = base + MESON_SDHC_CLKC; + clkc_data->div.shift = 0; + clkc_data->div.width = 12; + clkc_data->div.table = meson_mx_sdhc_div_table; + div_parent.hw = &clkc_data->src_sel.hw; + ret = meson_mx_sdhc_clk_hw_register(dev, "div", &div_parent, 1, + &clk_divider_ops, + &clkc_data->div.hw); + if (ret) + return ret; + + clkc_data->mod_clk_en.reg = base + MESON_SDHC_CLKC; + clkc_data->mod_clk_en.bit_idx = 15; + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "mod_clk_on", + &clkc_data->div.hw, + &clkc_data->mod_clk_en.hw); + if (ret) + return ret; + + clkc_data->tx_clk_en.reg = base + MESON_SDHC_CLKC; + clkc_data->tx_clk_en.bit_idx = 14; + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "tx_clk_on", + &clkc_data->div.hw, + &clkc_data->tx_clk_en.hw); + if (ret) + return ret; + + clkc_data->rx_clk_en.reg = base + MESON_SDHC_CLKC; + clkc_data->rx_clk_en.bit_idx = 13; + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "rx_clk_on", + &clkc_data->div.hw, + &clkc_data->rx_clk_en.hw); + if (ret) + return ret; + + clkc_data->sd_clk_en.reg = base + MESON_SDHC_CLKC; + clkc_data->sd_clk_en.bit_idx = 12; + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "sd_clk_on", + &clkc_data->div.hw, + &clkc_data->sd_clk_en.hw); + if (ret) + return ret; + + /* + * TODO: Replace clk_hw.clk with devm_clk_hw_get_clk() once that is + * available. + */ + clk_bulk_data[0].clk = clkc_data->mod_clk_en.hw.clk; + clk_bulk_data[1].clk = clkc_data->sd_clk_en.hw.clk; + clk_bulk_data[2].clk = clkc_data->tx_clk_en.hw.clk; + clk_bulk_data[3].clk = clkc_data->rx_clk_en.hw.clk; + + return 0; +} diff --git a/drivers/mmc/host/meson-mx-sdhc.c b/drivers/mmc/host/meson-mx-sdhc.c new file mode 100644 index 000000000000..5c00958d7754 --- /dev/null +++ b/drivers/mmc/host/meson-mx-sdhc.c @@ -0,0 +1,907 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Amlogic Meson6/Meson8/Meson8b/Meson8m2 SDHC MMC host controller driver. + * + * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com> + */ + +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/interrupt.h> +#include <linux/iopoll.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/types.h> + +#include <linux/mmc/host.h> +#include <linux/mmc/mmc.h> +#include <linux/mmc/sdio.h> +#include <linux/mmc/slot-gpio.h> + +#include "meson-mx-sdhc.h" + +#define MESON_SDHC_NUM_BULK_CLKS 4 +#define MESON_SDHC_MAX_BLK_SIZE 512 +#define MESON_SDHC_NUM_TUNING_TRIES 10 + +#define MESON_SDHC_WAIT_CMD_READY_SLEEP_US 1 +#define MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US 100000 +#define MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US 1 +#define MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US 200 + +struct meson_mx_sdhc_data { + void (*init_hw)(struct mmc_host *mmc); + void (*set_pdma)(struct mmc_host *mmc); + void (*wait_before_send)(struct mmc_host *mmc); + bool hardware_flush_all_cmds; +}; + +struct meson_mx_sdhc_host { + struct mmc_host *mmc; + + struct mmc_request *mrq; + struct mmc_command *cmd; + int error; + + struct regmap *regmap; + + struct clk *pclk; + struct clk *sd_clk; + struct clk_bulk_data bulk_clks[MESON_SDHC_NUM_BULK_CLKS]; + bool bulk_clks_enabled; + + const struct meson_mx_sdhc_data *platform; +}; + +static const struct regmap_config meson_mx_sdhc_regmap_config = { + .reg_bits = 8, + .val_bits = 32, + .reg_stride = 4, + .max_register = MESON_SDHC_CLK2, +}; + +static void meson_mx_sdhc_hw_reset(struct mmc_host *mmc) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + + regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_MAIN_CTRL | + MESON_SDHC_SRST_RXFIFO | MESON_SDHC_SRST_TXFIFO | + MESON_SDHC_SRST_DPHY_RX | MESON_SDHC_SRST_DPHY_TX | + MESON_SDHC_SRST_DMA_IF); + usleep_range(10, 100); + + regmap_write(host->regmap, MESON_SDHC_SRST, 0); + usleep_range(10, 100); +} + +static void meson_mx_sdhc_clear_fifo(struct mmc_host *mmc) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + u32 stat; + + regmap_read(host->regmap, MESON_SDHC_STAT, &stat); + if (!FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) && + !FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat)) + return; + + regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_RXFIFO | + MESON_SDHC_SRST_TXFIFO | MESON_SDHC_SRST_MAIN_CTRL); + udelay(5); + + regmap_read(host->regmap, MESON_SDHC_STAT, &stat); + if (FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) || + FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat)) + dev_warn(mmc_dev(host->mmc), + "Failed to clear FIFOs, RX: %lu, TX: %lu\n", + FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat), + FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat)); +} + +static void meson_mx_sdhc_wait_cmd_ready(struct mmc_host *mmc) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + u32 stat, esta; + int ret; + + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT, stat, + !(stat & MESON_SDHC_STAT_CMD_BUSY), + MESON_SDHC_WAIT_CMD_READY_SLEEP_US, + MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US); + if (ret) { + dev_warn(mmc_dev(mmc), + "Failed to poll for CMD_BUSY while processing CMD%d\n", + host->cmd->opcode); + meson_mx_sdhc_hw_reset(mmc); + } + + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, esta, + !(esta & MESON_SDHC_ESTA_11_13), + MESON_SDHC_WAIT_CMD_READY_SLEEP_US, + MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US); + if (ret) { + dev_warn(mmc_dev(mmc), + "Failed to poll for ESTA[13:11] while processing CMD%d\n", + host->cmd->opcode); + meson_mx_sdhc_hw_reset(mmc); + } +} + +static void meson_mx_sdhc_start_cmd(struct mmc_host *mmc, + struct mmc_command *cmd) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + u32 ictl, send; + int pack_len; + + host->cmd = cmd; + + ictl = MESON_SDHC_ICTL_DATA_TIMEOUT | MESON_SDHC_ICTL_DATA_ERR_CRC | + MESON_SDHC_ICTL_RXFIFO_FULL | MESON_SDHC_ICTL_TXFIFO_EMPTY | + MESON_SDHC_ICTL_RESP_TIMEOUT | MESON_SDHC_ICTL_RESP_ERR_CRC; + + send = FIELD_PREP(MESON_SDHC_SEND_CMD_INDEX, cmd->opcode); + + if (cmd->data) { + send |= MESON_SDHC_SEND_CMD_HAS_DATA; + send |= FIELD_PREP(MESON_SDHC_SEND_TOTAL_PACK, + cmd->data->blocks - 1); + + if (cmd->data->blksz < MESON_SDHC_MAX_BLK_SIZE) + pack_len = cmd->data->blksz; + else + pack_len = 0; + + if (cmd->data->flags & MMC_DATA_WRITE) + send |= MESON_SDHC_SEND_DATA_DIR; + + /* + * If command with no data, just wait response done + * interrupt(int[0]), and if command with data transfer, just + * wait dma done interrupt(int[11]), don't need care about + * dat0 busy or not. + */ + if (host->platform->hardware_flush_all_cmds || + cmd->data->flags & MMC_DATA_WRITE) + /* hardware flush: */ + ictl |= MESON_SDHC_ICTL_DMA_DONE; + else + /* software flush: */ + ictl |= MESON_SDHC_ICTL_DATA_XFER_OK; + } else { + pack_len = 0; + + ictl |= MESON_SDHC_ICTL_RESP_OK; + } + + if (cmd->opcode == MMC_STOP_TRANSMISSION) + send |= MESON_SDHC_SEND_DATA_STOP; + + if (cmd->flags & MMC_RSP_PRESENT) + send |= MESON_SDHC_SEND_CMD_HAS_RESP; + + if (cmd->flags & MMC_RSP_136) { + send |= MESON_SDHC_SEND_RESP_LEN; + send |= MESON_SDHC_SEND_RESP_NO_CRC; + } + + if (!(cmd->flags & MMC_RSP_CRC)) + send |= MESON_SDHC_SEND_RESP_NO_CRC; + + if (cmd->flags & MMC_RSP_BUSY) + send |= MESON_SDHC_SEND_R1B; + + /* enable the new IRQs and mask all pending ones */ + regmap_write(host->regmap, MESON_SDHC_ICTL, ictl); + regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS); + + regmap_write(host->regmap, MESON_SDHC_ARGU, cmd->arg); + + regmap_update_bits(host->regmap, MESON_SDHC_CTRL, + MESON_SDHC_CTRL_PACK_LEN, + FIELD_PREP(MESON_SDHC_CTRL_PACK_LEN, pack_len)); + + if (cmd->data) + regmap_write(host->regmap, MESON_SDHC_ADDR, + sg_dma_address(cmd->data->sg)); + + meson_mx_sdhc_wait_cmd_ready(mmc); + + if (cmd->data) + host->platform->set_pdma(mmc); + + if (host->platform->wait_before_send) + host->platform->wait_before_send(mmc); + + regmap_write(host->regmap, MESON_SDHC_SEND, send); +} + +static void meson_mx_sdhc_disable_clks(struct mmc_host *mmc) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + + if (!host->bulk_clks_enabled) + return; + + clk_bulk_disable_unprepare(MESON_SDHC_NUM_BULK_CLKS, host->bulk_clks); + + host->bulk_clks_enabled = false; +} + +static int meson_mx_sdhc_enable_clks(struct mmc_host *mmc) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + int ret; + + if (host->bulk_clks_enabled) + return 0; + + ret = clk_bulk_prepare_enable(MESON_SDHC_NUM_BULK_CLKS, + host->bulk_clks); + if (ret) + return ret; + + host->bulk_clks_enabled = true; + + return 0; +} + +static int meson_mx_sdhc_set_clk(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + u32 rx_clk_phase; + int ret; + + meson_mx_sdhc_disable_clks(mmc); + + if (ios->clock) { + ret = clk_set_rate(host->sd_clk, ios->clock); + if (ret) { + dev_warn(mmc_dev(mmc), + "Failed to set MMC clock to %uHz: %d\n", + ios->clock, host->error); + return ret; + } + + ret = meson_mx_sdhc_enable_clks(mmc); + if (ret) + return ret; + + mmc->actual_clock = clk_get_rate(host->sd_clk); + + /* + * according to Amlogic the following latching points are + * selected with empirical values, there is no (known) formula + * to calculate these. + */ + if (mmc->actual_clock > 100000000) { + rx_clk_phase = 1; + } else if (mmc->actual_clock > 45000000) { + if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) + rx_clk_phase = 15; + else + rx_clk_phase = 11; + } else if (mmc->actual_clock >= 25000000) { + rx_clk_phase = 15; + } else if (mmc->actual_clock > 5000000) { + rx_clk_phase = 23; + } else if (mmc->actual_clock > 1000000) { + rx_clk_phase = 55; + } else { + rx_clk_phase = 1061; + } + + regmap_update_bits(host->regmap, MESON_SDHC_CLK2, + MESON_SDHC_CLK2_RX_CLK_PHASE, + FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE, + rx_clk_phase)); + } else { + mmc->actual_clock = 0; + } + + return 0; +} + +static void meson_mx_sdhc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + unsigned short vdd = ios->vdd; + + switch (ios->power_mode) { + case MMC_POWER_OFF: + vdd = 0; + fallthrough; + + case MMC_POWER_UP: + if (!IS_ERR(mmc->supply.vmmc)) { + host->error = mmc_regulator_set_ocr(mmc, + mmc->supply.vmmc, + vdd); + if (host->error) + return; + } + + break; + + case MMC_POWER_ON: + break; + } + + host->error = meson_mx_sdhc_set_clk(mmc, ios); + if (host->error) + return; + + switch (ios->bus_width) { + case MMC_BUS_WIDTH_1: + regmap_update_bits(host->regmap, MESON_SDHC_CTRL, + MESON_SDHC_CTRL_DAT_TYPE, + FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 0)); + break; + + case MMC_BUS_WIDTH_4: + regmap_update_bits(host->regmap, MESON_SDHC_CTRL, + MESON_SDHC_CTRL_DAT_TYPE, + FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 1)); + break; + + case MMC_BUS_WIDTH_8: + regmap_update_bits(host->regmap, MESON_SDHC_CTRL, + MESON_SDHC_CTRL_DAT_TYPE, + FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 2)); + break; + + default: + dev_err(mmc_dev(mmc), "unsupported bus width: %d\n", + ios->bus_width); + host->error = -EINVAL; + return; + } +} + +static int meson_mx_sdhc_map_dma(struct mmc_host *mmc, struct mmc_request *mrq) +{ + struct mmc_data *data = mrq->data; + int dma_len; + + if (!data) + return 0; + + dma_len = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len, + mmc_get_dma_dir(data)); + if (dma_len <= 0) { + dev_err(mmc_dev(mmc), "dma_map_sg failed\n"); + return -ENOMEM; + } + + return 0; +} + +static void meson_mx_sdhc_request(struct mmc_host *mmc, struct mmc_request *mrq) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + struct mmc_command *cmd = mrq->cmd; + + if (!host->error) + host->error = meson_mx_sdhc_map_dma(mmc, mrq); + + if (host->error) { + cmd->error = host->error; + mmc_request_done(mmc, mrq); + return; + } + + host->mrq = mrq; + + meson_mx_sdhc_start_cmd(mmc, mrq->cmd); +} + +static int meson_mx_sdhc_card_busy(struct mmc_host *mmc) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + u32 stat; + + regmap_read(host->regmap, MESON_SDHC_STAT, &stat); + return FIELD_GET(MESON_SDHC_STAT_DAT3_0, stat) == 0; +} + +static bool meson_mx_sdhc_tuning_point_matches(struct mmc_host *mmc, + u32 opcode) +{ + unsigned int i, num_matches = 0; + int ret; + + for (i = 0; i < MESON_SDHC_NUM_TUNING_TRIES; i++) { + ret = mmc_send_tuning(mmc, opcode, NULL); + if (!ret) + num_matches++; + } + + return num_matches == MESON_SDHC_NUM_TUNING_TRIES; +} + +static int meson_mx_sdhc_execute_tuning(struct mmc_host *mmc, u32 opcode) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + int div, start, len, best_start, best_len; + int curr_phase, old_phase, new_phase; + u32 val; + + len = 0; + start = 0; + best_len = 0; + + regmap_read(host->regmap, MESON_SDHC_CLK2, &val); + old_phase = FIELD_GET(MESON_SDHC_CLK2_RX_CLK_PHASE, val); + + regmap_read(host->regmap, MESON_SDHC_CLKC, &val); + div = FIELD_GET(MESON_SDHC_CLKC_CLK_DIV, val); + + for (curr_phase = 0; curr_phase <= div; curr_phase++) { + regmap_update_bits(host->regmap, MESON_SDHC_CLK2, + MESON_SDHC_CLK2_RX_CLK_PHASE, + FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE, + curr_phase)); + + if (meson_mx_sdhc_tuning_point_matches(mmc, opcode)) { + if (!len) { + start = curr_phase; + + dev_dbg(mmc_dev(mmc), + "New RX phase window starts at %u\n", + start); + } + + len++; + } else { + if (len > best_len) { + best_start = start; + best_len = len; + + dev_dbg(mmc_dev(mmc), + "New best RX phase window: %u - %u\n", + best_start, best_start + best_len); + } + + /* reset the current window */ + len = 0; + } + } + + if (len > best_len) + /* the last window is the best (or possibly only) window */ + new_phase = start + (len / 2); + else if (best_len) + /* there was a better window than the last */ + new_phase = best_start + (best_len / 2); + else + /* no window was found at all, reset to the original phase */ + new_phase = old_phase; + + regmap_update_bits(host->regmap, MESON_SDHC_CLK2, + MESON_SDHC_CLK2_RX_CLK_PHASE, + FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE, + new_phase)); + + if (!len && !best_len) + return -EIO; + + dev_dbg(mmc_dev(mmc), "Tuned RX clock phase to %u\n", new_phase); + + return 0; +} + +static const struct mmc_host_ops meson_mx_sdhc_ops = { + .hw_reset = meson_mx_sdhc_hw_reset, + .request = meson_mx_sdhc_request, + .set_ios = meson_mx_sdhc_set_ios, + .card_busy = meson_mx_sdhc_card_busy, + .execute_tuning = meson_mx_sdhc_execute_tuning, + .get_cd = mmc_gpio_get_cd, + .get_ro = mmc_gpio_get_ro, +}; + +static void meson_mx_sdhc_request_done(struct meson_mx_sdhc_host *host) +{ + struct mmc_request *mrq = host->mrq; + struct mmc_host *mmc = host->mmc; + + /* disable interrupts and mask all pending ones */ + regmap_update_bits(host->regmap, MESON_SDHC_ICTL, + MESON_SDHC_ICTL_ALL_IRQS, 0); + regmap_update_bits(host->regmap, MESON_SDHC_ISTA, + MESON_SDHC_ISTA_ALL_IRQS, MESON_SDHC_ISTA_ALL_IRQS); + + host->mrq = NULL; + host->cmd = NULL; + + mmc_request_done(mmc, mrq); +} + +static u32 meson_mx_sdhc_read_response(struct meson_mx_sdhc_host *host, u8 idx) +{ + u32 val; + + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, + MESON_SDHC_PDMA_DMA_MODE, 0); + + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, + MESON_SDHC_PDMA_PIO_RDRESP, + FIELD_PREP(MESON_SDHC_PDMA_PIO_RDRESP, idx)); + + regmap_read(host->regmap, MESON_SDHC_ARGU, &val); + + return val; +} + +static irqreturn_t meson_mx_sdhc_irq(int irq, void *data) +{ + struct meson_mx_sdhc_host *host = data; + struct mmc_command *cmd = host->cmd; + u32 ictl, ista; + + regmap_read(host->regmap, MESON_SDHC_ICTL, &ictl); + regmap_read(host->regmap, MESON_SDHC_ISTA, &ista); + + if (!(ictl & ista)) + return IRQ_NONE; + + if (ista & MESON_SDHC_ISTA_RXFIFO_FULL || + ista & MESON_SDHC_ISTA_TXFIFO_EMPTY) + cmd->error = -EIO; + else if (ista & MESON_SDHC_ISTA_RESP_ERR_CRC) + cmd->error = -EILSEQ; + else if (ista & MESON_SDHC_ISTA_RESP_TIMEOUT) + cmd->error = -ETIMEDOUT; + + if (cmd->data) { + if (ista & MESON_SDHC_ISTA_DATA_ERR_CRC) + cmd->data->error = -EILSEQ; + else if (ista & MESON_SDHC_ISTA_DATA_TIMEOUT) + cmd->data->error = -ETIMEDOUT; + } + + if (cmd->error || (cmd->data && cmd->data->error)) + dev_dbg(mmc_dev(host->mmc), "CMD%d error, ISTA: 0x%08x\n", + cmd->opcode, ista); + + return IRQ_WAKE_THREAD; +} + +static irqreturn_t meson_mx_sdhc_irq_thread(int irq, void *irq_data) +{ + struct meson_mx_sdhc_host *host = irq_data; + struct mmc_command *cmd; + u32 val; + + cmd = host->cmd; + if (WARN_ON(!cmd)) + return IRQ_HANDLED; + + if (cmd->data && !cmd->data->error) { + if (!host->platform->hardware_flush_all_cmds && + cmd->data->flags & MMC_DATA_READ) { + meson_mx_sdhc_wait_cmd_ready(host->mmc); + + val = FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, + 2); + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, + MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, + val); + } + + dma_unmap_sg(mmc_dev(host->mmc), cmd->data->sg, + cmd->data->sg_len, mmc_get_dma_dir(cmd->data)); + + cmd->data->bytes_xfered = cmd->data->blksz * cmd->data->blocks; + } + + meson_mx_sdhc_wait_cmd_ready(host->mmc); + + if (cmd->flags & MMC_RSP_136) { + cmd->resp[0] = meson_mx_sdhc_read_response(host, 4); + cmd->resp[1] = meson_mx_sdhc_read_response(host, 3); + cmd->resp[2] = meson_mx_sdhc_read_response(host, 2); + cmd->resp[3] = meson_mx_sdhc_read_response(host, 1); + } else { + cmd->resp[0] = meson_mx_sdhc_read_response(host, 0); + } + + if (cmd->error == -EIO || cmd->error == -ETIMEDOUT) + meson_mx_sdhc_hw_reset(host->mmc); + else if (cmd->data) + /* + * Clear the FIFOs after completing data transfers to prevent + * corrupting data on write access. It's not clear why this is + * needed (for reads and writes), but it mimics what the BSP + * kernel did. + */ + meson_mx_sdhc_clear_fifo(host->mmc); + + meson_mx_sdhc_request_done(host); + + return IRQ_HANDLED; +} + +static void meson_mx_sdhc_init_hw_meson8(struct mmc_host *mmc) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + + regmap_write(host->regmap, MESON_SDHC_MISC, + FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 7) | + FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) | + FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2)); + + regmap_write(host->regmap, MESON_SDHC_ENHC, + FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 63) | + MESON_SDHC_ENHC_MESON6_DMA_WR_RESP | + FIELD_PREP(MESON_SDHC_ENHC_MESON6_RX_TIMEOUT, 255) | + FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12)); +}; + +static void meson_mx_sdhc_set_pdma_meson8(struct mmc_host *mmc) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + + if (host->cmd->data->flags & MMC_DATA_WRITE) + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, + MESON_SDHC_PDMA_DMA_MODE | + MESON_SDHC_PDMA_RD_BURST | + MESON_SDHC_PDMA_TXFIFO_FILL, + MESON_SDHC_PDMA_DMA_MODE | + FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 31) | + MESON_SDHC_PDMA_TXFIFO_FILL); + else + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, + MESON_SDHC_PDMA_DMA_MODE | + MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, + MESON_SDHC_PDMA_DMA_MODE | + FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, + 1)); + + if (host->cmd->data->flags & MMC_DATA_WRITE) + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, + MESON_SDHC_PDMA_RD_BURST, + FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15)); +} + +static void meson_mx_sdhc_wait_before_send_meson8(struct mmc_host *mmc) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + u32 val; + int ret; + + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, val, + val == 0, + MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US, + MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US); + if (ret) + dev_warn(mmc_dev(mmc), + "Failed to wait for ESTA to clear: 0x%08x\n", val); + + if (host->cmd->data && host->cmd->data->flags & MMC_DATA_WRITE) { + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT, + val, val & MESON_SDHC_STAT_TXFIFO_CNT, + MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US, + MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US); + if (ret) + dev_warn(mmc_dev(mmc), + "Failed to wait for TX FIFO to fill\n"); + } +} + +static void meson_mx_sdhc_init_hw_meson8m2(struct mmc_host *mmc) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + + regmap_write(host->regmap, MESON_SDHC_MISC, + FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 6) | + FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) | + FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2)); + + regmap_write(host->regmap, MESON_SDHC_ENHC, + FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 64) | + FIELD_PREP(MESON_SDHC_ENHC_MESON8M2_DEBUG, 1) | + MESON_SDHC_ENHC_MESON8M2_WRRSP_MODE | + FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12)); +} + +static void meson_mx_sdhc_set_pdma_meson8m2(struct mmc_host *mmc) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, + MESON_SDHC_PDMA_DMA_MODE, MESON_SDHC_PDMA_DMA_MODE); +} + +static void meson_mx_sdhc_init_hw(struct mmc_host *mmc) +{ + struct meson_mx_sdhc_host *host = mmc_priv(mmc); + + meson_mx_sdhc_hw_reset(mmc); + + regmap_write(host->regmap, MESON_SDHC_CTRL, + FIELD_PREP(MESON_SDHC_CTRL_RX_PERIOD, 0xf) | + FIELD_PREP(MESON_SDHC_CTRL_RX_TIMEOUT, 0x7f) | + FIELD_PREP(MESON_SDHC_CTRL_RX_ENDIAN, 0x7) | + FIELD_PREP(MESON_SDHC_CTRL_TX_ENDIAN, 0x7)); + + /* + * start with a valid divider and enable the memory (un-setting + * MESON_SDHC_CLKC_MEM_PWR_OFF). + */ + regmap_write(host->regmap, MESON_SDHC_CLKC, MESON_SDHC_CLKC_CLK_DIV); + + regmap_write(host->regmap, MESON_SDHC_CLK2, + FIELD_PREP(MESON_SDHC_CLK2_SD_CLK_PHASE, 1)); + + regmap_write(host->regmap, MESON_SDHC_PDMA, + MESON_SDHC_PDMA_DMA_URGENT | + FIELD_PREP(MESON_SDHC_PDMA_WR_BURST, 7) | + FIELD_PREP(MESON_SDHC_PDMA_TXFIFO_TH, 49) | + FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15) | + FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_TH, 7)); + + /* some initialization bits depend on the SoC: */ + host->platform->init_hw(mmc); + + /* disable and mask all interrupts: */ + regmap_write(host->regmap, MESON_SDHC_ICTL, 0); + regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS); +} + +static int meson_mx_sdhc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct meson_mx_sdhc_host *host; + struct mmc_host *mmc; + void __iomem *base; + int ret, irq; + + mmc = mmc_alloc_host(sizeof(*host), dev); + if (!mmc) + return -ENOMEM; + + ret = devm_add_action_or_reset(dev, (void(*)(void *))mmc_free_host, + mmc); + if (ret) { + dev_err(dev, "Failed to register mmc_free_host action\n"); + return ret; + } + + host = mmc_priv(mmc); + host->mmc = mmc; + + platform_set_drvdata(pdev, host); + + host->platform = device_get_match_data(dev); + if (!host->platform) + return -EINVAL; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + host->regmap = devm_regmap_init_mmio(dev, base, + &meson_mx_sdhc_regmap_config); + if (IS_ERR(host->regmap)) + return PTR_ERR(host->regmap); + + host->pclk = devm_clk_get(dev, "pclk"); + if (IS_ERR(host->pclk)) + return PTR_ERR(host->pclk); + + /* accessing any register requires the module clock to be enabled: */ + ret = clk_prepare_enable(host->pclk); + if (ret) { + dev_err(dev, "Failed to enable 'pclk' clock\n"); + return ret; + } + + meson_mx_sdhc_init_hw(mmc); + + ret = meson_mx_sdhc_register_clkc(dev, base, host->bulk_clks); + if (ret) + goto err_disable_pclk; + + host->sd_clk = host->bulk_clks[1].clk; + + /* Get regulators and the supported OCR mask */ + ret = mmc_regulator_get_supply(mmc); + if (ret) + goto err_disable_pclk; + + mmc->max_req_size = SZ_128K; + mmc->max_seg_size = mmc->max_req_size; + mmc->max_blk_count = FIELD_GET(MESON_SDHC_SEND_TOTAL_PACK, ~0); + mmc->max_blk_size = MESON_SDHC_MAX_BLK_SIZE; + mmc->max_busy_timeout = 30 * MSEC_PER_SEC; + mmc->f_min = clk_round_rate(host->sd_clk, 1); + mmc->f_max = clk_round_rate(host->sd_clk, ULONG_MAX); + mmc->max_current_180 = 300; + mmc->max_current_330 = 300; + mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_HW_RESET; + mmc->ops = &meson_mx_sdhc_ops; + + ret = mmc_of_parse(mmc); + if (ret) + goto err_disable_pclk; + + irq = platform_get_irq(pdev, 0); + ret = devm_request_threaded_irq(dev, irq, meson_mx_sdhc_irq, + meson_mx_sdhc_irq_thread, IRQF_ONESHOT, + NULL, host); + if (ret) + goto err_disable_pclk; + + ret = mmc_add_host(mmc); + if (ret) + goto err_disable_pclk; + + return 0; + +err_disable_pclk: + clk_disable_unprepare(host->pclk); + return ret; +} + +static int meson_mx_sdhc_remove(struct platform_device *pdev) +{ + struct meson_mx_sdhc_host *host = platform_get_drvdata(pdev); + + mmc_remove_host(host->mmc); + + meson_mx_sdhc_disable_clks(host->mmc); + + clk_disable_unprepare(host->pclk); + + return 0; +} + +static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8 = { + .init_hw = meson_mx_sdhc_init_hw_meson8, + .set_pdma = meson_mx_sdhc_set_pdma_meson8, + .wait_before_send = meson_mx_sdhc_wait_before_send_meson8, + .hardware_flush_all_cmds = false, +}; + +static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8m2 = { + .init_hw = meson_mx_sdhc_init_hw_meson8m2, + .set_pdma = meson_mx_sdhc_set_pdma_meson8m2, + .hardware_flush_all_cmds = true, +}; + +static const struct of_device_id meson_mx_sdhc_of_match[] = { + { + .compatible = "amlogic,meson8-sdhc", + .data = &meson_mx_sdhc_data_meson8 + }, + { + .compatible = "amlogic,meson8b-sdhc", + .data = &meson_mx_sdhc_data_meson8 + }, + { + .compatible = "amlogic,meson8m2-sdhc", + .data = &meson_mx_sdhc_data_meson8m2 + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, meson_mx_sdhc_of_match); + +static struct platform_driver meson_mx_sdhc_driver = { + .probe = meson_mx_sdhc_probe, + .remove = meson_mx_sdhc_remove, + .driver = { + .name = "meson-mx-sdhc", + .of_match_table = of_match_ptr(meson_mx_sdhc_of_match), + }, +}; + +module_platform_driver(meson_mx_sdhc_driver); + +MODULE_DESCRIPTION("Meson6, Meson8, Meson8b and Meson8m2 SDHC Host Driver"); +MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/mmc/host/meson-mx-sdhc.h b/drivers/mmc/host/meson-mx-sdhc.h new file mode 100644 index 000000000000..230e8fbe6b3f --- /dev/null +++ b/drivers/mmc/host/meson-mx-sdhc.h @@ -0,0 +1,141 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com> + */ + +#ifndef _MESON_MX_SDHC_H_ +#define _MESON_MX_SDHC_H_ + +#include <linux/bitfield.h> + +#define MESON_SDHC_ARGU 0x00 + +#define MESON_SDHC_SEND 0x04 + #define MESON_SDHC_SEND_CMD_INDEX GENMASK(5, 0) + #define MESON_SDHC_SEND_CMD_HAS_RESP BIT(6) + #define MESON_SDHC_SEND_CMD_HAS_DATA BIT(7) + #define MESON_SDHC_SEND_RESP_LEN BIT(8) + #define MESON_SDHC_SEND_RESP_NO_CRC BIT(9) + #define MESON_SDHC_SEND_DATA_DIR BIT(10) + #define MESON_SDHC_SEND_DATA_STOP BIT(11) + #define MESON_SDHC_SEND_R1B BIT(12) + #define MESON_SDHC_SEND_TOTAL_PACK GENMASK(31, 16) + +#define MESON_SDHC_CTRL 0x08 + #define MESON_SDHC_CTRL_DAT_TYPE GENMASK(1, 0) + #define MESON_SDHC_CTRL_DDR_MODE BIT(2) + #define MESON_SDHC_CTRL_TX_CRC_NOCHECK BIT(3) + #define MESON_SDHC_CTRL_PACK_LEN GENMASK(12, 4) + #define MESON_SDHC_CTRL_RX_TIMEOUT GENMASK(19, 13) + #define MESON_SDHC_CTRL_RX_PERIOD GENMASK(23, 20) + #define MESON_SDHC_CTRL_RX_ENDIAN GENMASK(26, 24) + #define MESON_SDHC_CTRL_SDIO_IRQ_MODE BIT(27) + #define MESON_SDHC_CTRL_DAT0_IRQ_SEL BIT(28) + #define MESON_SDHC_CTRL_TX_ENDIAN GENMASK(31, 29) + +#define MESON_SDHC_STAT 0x0c + #define MESON_SDHC_STAT_CMD_BUSY BIT(0) + #define MESON_SDHC_STAT_DAT3_0 GENMASK(4, 1) + #define MESON_SDHC_STAT_CMD BIT(5) + #define MESON_SDHC_STAT_RXFIFO_CNT GENMASK(12, 6) + #define MESON_SDHC_STAT_TXFIFO_CNT GENMASK(19, 13) + #define MESON_SDHC_STAT_DAT7_4 GENMASK(23, 20) + +#define MESON_SDHC_CLKC 0x10 + #define MESON_SDHC_CLKC_CLK_DIV GENMASK(11, 0) + #define MESON_SDHC_CLKC_CLK_JIC BIT(24) + #define MESON_SDHC_CLKC_MEM_PWR_OFF GENMASK(26, 25) + +#define MESON_SDHC_ADDR 0x14 + +#define MESON_SDHC_PDMA 0x18 + #define MESON_SDHC_PDMA_DMA_MODE BIT(0) + #define MESON_SDHC_PDMA_PIO_RDRESP GENMASK(3, 1) + #define MESON_SDHC_PDMA_DMA_URGENT BIT(4) + #define MESON_SDHC_PDMA_WR_BURST GENMASK(9, 5) + #define MESON_SDHC_PDMA_RD_BURST GENMASK(14, 10) + #define MESON_SDHC_PDMA_RXFIFO_TH GENMASK(21, 15) + #define MESON_SDHC_PDMA_TXFIFO_TH GENMASK(28, 22) + #define MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH GENMASK(30, 29) + #define MESON_SDHC_PDMA_TXFIFO_FILL BIT(31) + +#define MESON_SDHC_MISC 0x1c + #define MESON_SDHC_MISC_WCRC_ERR_PATT GENMASK(6, 4) + #define MESON_SDHC_MISC_WCRC_OK_PATT GENMASK(9, 7) + #define MESON_SDHC_MISC_BURST_NUM GENMASK(21, 16) + #define MESON_SDHC_MISC_THREAD_ID GENMASK(27, 22) + #define MESON_SDHC_MISC_MANUAL_STOP BIT(28) + #define MESON_SDHC_MISC_TXSTART_THRES GENMASK(31, 29) + +#define MESON_SDHC_DATA 0x20 + +#define MESON_SDHC_ICTL 0x24 + #define MESON_SDHC_ICTL_RESP_OK BIT(0) + #define MESON_SDHC_ICTL_RESP_TIMEOUT BIT(1) + #define MESON_SDHC_ICTL_RESP_ERR_CRC BIT(2) + #define MESON_SDHC_ICTL_RESP_OK_NOCLEAR BIT(3) + #define MESON_SDHC_ICTL_DATA_1PACK_OK BIT(4) + #define MESON_SDHC_ICTL_DATA_TIMEOUT BIT(5) + #define MESON_SDHC_ICTL_DATA_ERR_CRC BIT(6) + #define MESON_SDHC_ICTL_DATA_XFER_OK BIT(7) + #define MESON_SDHC_ICTL_RX_HIGHER BIT(8) + #define MESON_SDHC_ICTL_RX_LOWER BIT(9) + #define MESON_SDHC_ICTL_DAT1_IRQ BIT(10) + #define MESON_SDHC_ICTL_DMA_DONE BIT(11) + #define MESON_SDHC_ICTL_RXFIFO_FULL BIT(12) + #define MESON_SDHC_ICTL_TXFIFO_EMPTY BIT(13) + #define MESON_SDHC_ICTL_ADDI_DAT1_IRQ BIT(14) + #define MESON_SDHC_ICTL_ALL_IRQS GENMASK(14, 0) + #define MESON_SDHC_ICTL_DAT1_IRQ_DELAY GENMASK(17, 16) + +#define MESON_SDHC_ISTA 0x28 + #define MESON_SDHC_ISTA_RESP_OK BIT(0) + #define MESON_SDHC_ISTA_RESP_TIMEOUT BIT(1) + #define MESON_SDHC_ISTA_RESP_ERR_CRC BIT(2) + #define MESON_SDHC_ISTA_RESP_OK_NOCLEAR BIT(3) + #define MESON_SDHC_ISTA_DATA_1PACK_OK BIT(4) + #define MESON_SDHC_ISTA_DATA_TIMEOUT BIT(5) + #define MESON_SDHC_ISTA_DATA_ERR_CRC BIT(6) + #define MESON_SDHC_ISTA_DATA_XFER_OK BIT(7) + #define MESON_SDHC_ISTA_RX_HIGHER BIT(8) + #define MESON_SDHC_ISTA_RX_LOWER BIT(9) + #define MESON_SDHC_ISTA_DAT1_IRQ BIT(10) + #define MESON_SDHC_ISTA_DMA_DONE BIT(11) + #define MESON_SDHC_ISTA_RXFIFO_FULL BIT(12) + #define MESON_SDHC_ISTA_TXFIFO_EMPTY BIT(13) + #define MESON_SDHC_ISTA_ADDI_DAT1_IRQ BIT(14) + #define MESON_SDHC_ISTA_ALL_IRQS GENMASK(14, 0) + +#define MESON_SDHC_SRST 0x2c + #define MESON_SDHC_SRST_MAIN_CTRL BIT(0) + #define MESON_SDHC_SRST_RXFIFO BIT(1) + #define MESON_SDHC_SRST_TXFIFO BIT(2) + #define MESON_SDHC_SRST_DPHY_RX BIT(3) + #define MESON_SDHC_SRST_DPHY_TX BIT(4) + #define MESON_SDHC_SRST_DMA_IF BIT(5) + +#define MESON_SDHC_ESTA 0x30 + #define MESON_SDHC_ESTA_11_13 GENMASK(13, 11) + +#define MESON_SDHC_ENHC 0x34 + #define MESON_SDHC_ENHC_MESON8M2_WRRSP_MODE BIT(0) + #define MESON_SDHC_ENHC_MESON8M2_CHK_WRRSP BIT(1) + #define MESON_SDHC_ENHC_MESON8M2_CHK_DMA BIT(2) + #define MESON_SDHC_ENHC_MESON8M2_DEBUG GENMASK(5, 3) + #define MESON_SDHC_ENHC_MESON6_RX_TIMEOUT GENMASK(7, 0) + #define MESON_SDHC_ENHC_MESON6_DMA_RD_RESP BIT(16) + #define MESON_SDHC_ENHC_MESON6_DMA_WR_RESP BIT(17) + #define MESON_SDHC_ENHC_SDIO_IRQ_PERIOD GENMASK(15, 8) + #define MESON_SDHC_ENHC_RXFIFO_TH GENMASK(24, 18) + #define MESON_SDHC_ENHC_TXFIFO_TH GENMASK(31, 25) + +#define MESON_SDHC_CLK2 0x38 + #define MESON_SDHC_CLK2_RX_CLK_PHASE GENMASK(11, 0) + #define MESON_SDHC_CLK2_SD_CLK_PHASE GENMASK(23, 12) + +struct clk_bulk_data; + +int meson_mx_sdhc_register_clkc(struct device *dev, void __iomem *base, + struct clk_bulk_data *clk_bulk_data); + +#endif /* _MESON_MX_SDHC_H_ */