From patchwork Tue Aug 6 13:57:23 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonas Jensen X-Patchwork-Id: 2839421 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 5990E9F485 for ; Tue, 6 Aug 2013 13:58:21 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 28B9C20161 for ; Tue, 6 Aug 2013 13:58:19 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 834302012C for ; Tue, 6 Aug 2013 13:58:16 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1V6hmA-0006CD-Dv; Tue, 06 Aug 2013 13:58:14 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1V6hm8-0006y7-5G; Tue, 06 Aug 2013 13:58:12 +0000 Received: from mail-lb0-x22c.google.com ([2a00:1450:4010:c04::22c]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1V6hm3-0006xO-1p for linux-arm-kernel@lists.infradead.org; Tue, 06 Aug 2013 13:58:09 +0000 Received: by mail-lb0-f172.google.com with SMTP id o7so516913lbv.31 for ; Tue, 06 Aug 2013 06:57:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=nNq7U1b2AQj/8vRguDEbF7mHEEEH9cbXSGXSRVfDZdc=; b=LA0nTQGLVeYp00o01lBPief6Lm6vFx42igXiNyDYAmGMCzwqrawwRqYFaiHK8riPh9 6DfWip2GxPXB4ySvP2/bV7zlwwxIsRKTCpI9OPyI7zLEkG94YJ+Q2hK4saLVunWrp0L5 R1tz+FtZTG/qWhJ9lWALzw7lVb2AbZVxd3eB8avnWy41PRhwxmHXHkxTXV0tjybnxvqo VU0PDtVn0qhLvKW3Z29hob2amfff+9e43H0BYCNymqbELMvTARZHWqDreo4qobr4ZLu5 9s6ilCe+Ewic7veGBtCtMc/aoY5yLkEJMdJh6TIgszmGJSh9b9Yote23i9b0xKHxXid4 2o6w== X-Received: by 10.152.3.42 with SMTP id 10mr771073laz.22.1375797463453; Tue, 06 Aug 2013 06:57:43 -0700 (PDT) Received: from Ildjarn.ath.cx (static-213-115-41-10.sme.bredbandsbolaget.se. [213.115.41.10]) by mx.google.com with ESMTPSA id b5sm1346522lbe.8.2013.08.06.06.57.41 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Tue, 06 Aug 2013 06:57:42 -0700 (PDT) From: Jonas Jensen To: linux-mmc@vger.kernel.org Subject: [PATCH v4] mmc: sdhci-moxart: Add MOXA ART SDHCI driver Date: Tue, 6 Aug 2013 15:57:23 +0200 Message-Id: <1375797443-5990-1-git-send-email-jonas.jensen@gmail.com> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1375094974-7536-1-git-send-email-jonas.jensen@gmail.com> References: <1375094974-7536-1-git-send-email-jonas.jensen@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130806_095807_617818_71DAE16B X-CRM114-Status: GOOD ( 24.28 ) X-Spam-Score: -2.0 (--) Cc: mark.rutland@arm.com, linux-kernel@vger.kernel.org, Jonas Jensen , arm@kernel.org, cjb@laptop.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.1 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add SDHCI driver for MOXA ART SoCs. Signed-off-by: Jonas Jensen --- Notes: Changes since v3: 1. don't rely on structs for register offsets 2. use DT probed DMA, remove extern bool moxart_filter_fn() 3. remove unnecessary ternary operator in moxart_get_ro 4. check return value of devm_request_irq device tree bindings document: 5. add description of DT DMA node Applies to next-20130806 .../devicetree/bindings/mmc/moxa,moxart-mmc.txt | 28 + drivers/mmc/host/Kconfig | 9 + drivers/mmc/host/Makefile | 1 + drivers/mmc/host/sdhci-moxart.c | 917 +++++++++++++++++++++ 4 files changed, 955 insertions(+) create mode 100644 Documentation/devicetree/bindings/mmc/moxa,moxart-mmc.txt create mode 100644 drivers/mmc/host/sdhci-moxart.c diff --git a/Documentation/devicetree/bindings/mmc/moxa,moxart-mmc.txt b/Documentation/devicetree/bindings/mmc/moxa,moxart-mmc.txt new file mode 100644 index 0000000..c9ad588 --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/moxa,moxart-mmc.txt @@ -0,0 +1,28 @@ +MOXA ART SD Host Controller Interface + +Required properties: + +- compatible : Must be "moxa,moxart-mmc" +- reg : Should contain registers location and length +- interrupts : Should contain the interrupt number +- clocks : Should contain phandle for the clock feeding the SDHCI controller + +Optional properties: + +These are optional but required to enable DMA transfer mode: + +- dmas : Should contain two DMA channels, line request number must be 5 for + both channels +- dma-names : Must be "tx", "rx" + +Example: + + mmc: mmc@98e00000 { + compatible = "moxa,moxart-mmc"; + reg = <0x98e00000 0x5C>; + interrupts = <5 0>; + clocks = <&coreclk>; + dmas = <&dma 0 5>, + <&dma 1 5>; + dma-names = "tx", "rx"; + }; diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index 8a4c066..3c246390 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -271,6 +271,15 @@ config MMC_SDHCI_BCM2835 If unsure, say N. +config MMC_SDHCI_MOXART + tristate "MOXART SD Host Controller Interface support" + depends on ARCH_MOXART && MMC + help + This selects the MOXART SD Host Controller Interface. + MOXA provides one multi-functional card reader which can + be found on some embedded hardware such as UC-7112-LX. + If you have a controller with this interface, say Y here. + config MMC_OMAP tristate "TI OMAP Multimedia Card Interface support" depends on ARCH_OMAP diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index d422e21..c91317f 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile @@ -63,6 +63,7 @@ obj-$(CONFIG_MMC_SDHCI_OF_ESDHC) += sdhci-of-esdhc.o obj-$(CONFIG_MMC_SDHCI_OF_HLWD) += sdhci-of-hlwd.o obj-$(CONFIG_MMC_SDHCI_BCM_KONA) += sdhci-bcm-kona.o obj-$(CONFIG_MMC_SDHCI_BCM2835) += sdhci-bcm2835.o +obj-$(CONFIG_MMC_SDHCI_MOXART) += sdhci-moxart.o ifeq ($(CONFIG_CB710_DEBUG),y) CFLAGS-cb710-mmc += -DDEBUG diff --git a/drivers/mmc/host/sdhci-moxart.c b/drivers/mmc/host/sdhci-moxart.c new file mode 100644 index 0000000..c8c1807 --- /dev/null +++ b/drivers/mmc/host/sdhci-moxart.c @@ -0,0 +1,917 @@ +/* + * MOXA ART MMC host driver. + * + * Copyright (C) 2013 Jonas Jensen + * + * Jonas Jensen + * + * Based on code from + * Moxa Technology Co., Ltd. + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#define MSD_CMD_REG 0 +#define MSD_ARG_REG 4 +#define MSD_RESP0_REG 8 +#define MSD_RESP1_REG 0x0c +#define MSD_RESP2_REG 0x10 +#define MSD_RESP3_REG 0x14 +#define MSD_RESP_CMD_REG 0x18 +#define MSD_DATA_CTRL_REG 0x1c +#define MSD_DATA_TIMER_REG 0x20 +#define MSD_DATA_LEN_REG 0x24 +#define MSD_STATUS_REG 0x28 +#define MSD_CLEAR_REG 0x2c +#define MSD_INT_MASK_REG 0x30 +#define MSD_POWER_CTRL_REG 0x34 +#define MSD_CLOCK_CTRL_REG 0x38 +#define MSD_BUS_WIDTH_REG 0x3c +#define MSD_DATA_WIN_REG 0x40 +#define MSD_FEATURE_REG 0x44 +#define MSD_REVISION_REG 0x48 + +#define MMC_RSP_SHORT 1 +#define MMC_RSP_LONG 2 +#define MMC_RSP_MASK 3 +#define MMC_ERR_NONE 0 +#define MMC_ERR_TIMEOUT 1 +#define MMC_MODE_MMC 0 +#define MMC_MODE_SD 1 +#define MMC_ERR_BADCRC 2 +#define MMC_VDD_360 23 + +#define MSD_RETRY_COUNT 10 + +#define REG_COMMAND 0 +#define REG_ARGUMENT 4 +#define REG_RESPONSE0 8 +#define REG_RESPONSE1 12 +#define REG_RESPONSE2 16 +#define REG_RESPONSE3 20 +#define REG_RESPONSE_COMMAND 24 +#define REG_DATA_CONTROL 28 +#define REG_DATA_TIMER 32 +#define REG_DATA_LENGTH 36 +#define REG_STATUS 40 +#define REG_CLEAR 44 +#define REG_INTERRUPT_MASK 48 +#define REG_POWER_CONTROL 52 +#define REG_CLOCK_CONTROL 56 +#define REG_BUS_WIDTH 60 +#define REG_DATA_WINDOW 64 +#define REG_FEATURE 68 +#define REG_REVISION 72 + +/* REG_COMMAND */ +#define MSD_SDC_RST BIT(10) +#define MSD_CMD_EN BIT(9) +#define MSD_APP_CMD BIT(8) +#define MSD_LONG_RSP BIT(7) +#define MSD_NEED_RSP BIT(6) +#define MSD_CMD_IDX_MASK 0x3f + +/* REG_RESPONSE_COMMAND */ +#define MSD_RSP_CMD_APP BIT(6) +#define MSD_RSP_CMD_IDX_MASK 0x3f + +/* REG_DATA_CONTROL */ +#define MSD_DATA_EN BIT(6) +#define MSD_DMA_EN BIT(5) +#define MSD_DATA_WRITE BIT(4) +#define MSD_BLK_SIZE_MASK 0x0f + +/* REG_DATA_LENGTH */ +#define MSD_DATA_LEN_MASK 0xffffff + +/* REG_STATUS */ +#define MSD_WRITE_PROT BIT(12) +#define MSD_CARD_DETECT BIT(11) +/* 1-10 below can be sent to interrupt or clear register */ +#define MSD_CARD_CHANGE BIT(10) +#define MSD_FIFO_ORUN BIT(9) +#define MSD_FIFO_URUN BIT(8) +#define MSD_DATA_END BIT(7) +#define MSD_CMD_SENT BIT(6) +#define MSD_DATA_CRC_OK BIT(5) +#define MSD_RSP_CRC_OK BIT(4) +#define MSD_DATA_TIMEOUT BIT(3) +#define MSD_RSP_TIMEOUT BIT(2) +#define MSD_DATA_CRC_FAIL BIT(1) +#define MSD_RSP_CRC_FAIL BIT(0) + +/* REG_POWER_CONTROL */ +#define MSD_SD_POWER_ON BIT(4) +#define MSD_SD_POWER_MASK 0x0f + +/* REG_CLOCK_CONTROL */ +#define MSD_CLK_DIS BIT(8) +#define MSD_CLK_SD BIT(7) +#define MSD_CLK_DIV_MASK 0x7f + +/* REG_BUS_WIDTH */ +#define MSD_WIDE_BUS_SUPPORT BIT(3) +#define MSD_WIDE_BUS BIT(2) /* bus width is 4 bytes */ +#define MSD_SINGLE_BUS BIT(0) /* bus width is 1 byte */ + +/* REG_FEATURE */ +#define MSD_CPRM_FUNCTION BIT(8) + +struct moxart_host { + spinlock_t lock; + void __iomem *base; + phys_addr_t reg_phys; + + struct dma_chan *dma_chan_rx; + struct dma_chan *dma_chan_tx; + struct dma_chan *dma_chan_cur; + unsigned int dma_direction; + bool have_dma; + struct completion dma_complete; + struct completion pio_complete; + + struct mmc_host *mmc; + struct mmc_request *mrq; + + struct scatterlist *cur_sg; + unsigned int num_sg; + unsigned int remain; + int size; + + unsigned int wait_for; + unsigned int timeout; + long sysclk; + bool removed; +}; + +#define MSD_FIFO_LENW 4 /* 4 words, total 4 * 4 = 16 bytes */ +#define MSD_FIFO_LENB 16 /* 16 bytes */ + +#define DMA_FIFO_LEN_FORCE 0 +#define MIN_POWER (MMC_VDD_360 - MSD_SD_POWER_MASK) + +static inline void moxart_init_sg(struct moxart_host *host, + struct mmc_data *data) +{ + host->cur_sg = data->sg; + host->num_sg = data->sg_len; + host->remain = host->cur_sg->length; + + if (host->remain > host->size) + host->remain = host->size; + + data->error = MMC_ERR_NONE; +} + +static inline int moxart_next_sg(struct moxart_host *host) +{ + int remain; + struct mmc_data *data = host->mrq->cmd->data; + + host->cur_sg++; + host->num_sg--; + + if (host->num_sg > 0) { + host->remain = host->cur_sg->length; + remain = host->size - data->bytes_xfered; + if (remain > 0 && remain < host->remain) + host->remain = remain; + } + + return host->num_sg; +} + +static void moxart_send_command(struct moxart_host *host, + struct mmc_command *cmd) +{ + unsigned int status, cmdctrl; + int retry = 0; + + dev_dbg(mmc_dev(host->mmc), "%s: cmd->opcode=%d\n", + __func__, cmd->opcode); + + cmd->error = MMC_ERR_TIMEOUT; + + writel(MSD_RSP_TIMEOUT | MSD_RSP_CRC_OK | + MSD_RSP_CRC_FAIL | MSD_CMD_SENT, host->base + REG_CLEAR); + writel(cmd->arg, host->base + REG_ARGUMENT); + + cmdctrl = cmd->opcode & MSD_CMD_IDX_MASK; + if (cmdctrl == SD_APP_SET_BUS_WIDTH || cmdctrl == SD_APP_OP_COND || + cmdctrl == SD_APP_SEND_SCR || cmdctrl == SD_APP_SD_STATUS || + cmdctrl == SD_APP_SEND_NUM_WR_BLKS) + cmdctrl |= MSD_APP_CMD; + + if (cmd->flags & MMC_RSP_136) + cmdctrl |= (MSD_LONG_RSP | MSD_NEED_RSP); + else + cmdctrl |= MSD_NEED_RSP; + + writel(cmdctrl | MSD_CMD_EN, host->base + REG_COMMAND); + + while (retry++ < MSD_RETRY_COUNT) { + udelay(10); + status = readl(host->base + REG_STATUS); + if (status & MSD_CARD_DETECT) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_CARD_DETECT\n", + __func__); + cmd->error = MMC_ERR_TIMEOUT; + break; + } + if (cmdctrl & MSD_NEED_RSP) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_NEED_RSP\n", + __func__); + if (status & MSD_RSP_TIMEOUT) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_RSP_TIMEOUT\n", + __func__); + writel(MSD_RSP_TIMEOUT, host->base + REG_CLEAR); + cmd->error = MMC_ERR_TIMEOUT; + break; + } + if ((cmd->flags & MMC_RSP_CRC) && + (status & MSD_RSP_CRC_FAIL)) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_RSP_CRC_FAIL\n", + __func__); + writel(MSD_RSP_CRC_FAIL, host->base + + REG_CLEAR); + cmd->error = MMC_ERR_BADCRC; + break; + } + if (status & MSD_RSP_CRC_OK) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_RSP_CRC_OK\n", + __func__); + writel(MSD_RSP_CRC_OK, host->base + REG_CLEAR); + + if (cmd->flags & MMC_RSP_136) { + cmd->resp[3] = + readl(host->base + + REG_RESPONSE0); + cmd->resp[2] = + readl(host->base + + REG_RESPONSE1); + cmd->resp[1] = + readl(host->base + + REG_RESPONSE2); + cmd->resp[0] = + readl(host->base + + REG_RESPONSE3); + } else { + cmd->resp[0] = + readl(host->base + + REG_RESPONSE0); + } + + cmd->error = MMC_ERR_NONE; + break; + } + } else { + dev_dbg(mmc_dev(host->mmc), "%s: !(cmdctrl & MSD_NEED_RSP)\n", + __func__); + if (status & MSD_CMD_SENT) { + writel(MSD_CMD_SENT, host->base + REG_CLEAR); + cmd->error = MMC_ERR_NONE; + break; + } + } + } + + if (retry >= (MSD_RETRY_COUNT - 1)) { + /* + * this seems to happen a lot on or after CMD25 + * (MMC_WRITE_MULTIPLE_BLOCK) with more than 4 blocks + * (>4096), possibly because the transfer is too big + * or takes too long to complete. + * when this happens the controller is usually rendered + * unresponsive and can only be recovered with reboot. + */ + dev_dbg(mmc_dev(host->mmc), "%s: WARNING! no valid status found!\n", + __func__); + } +} + +static void moxart_dma_complete(void *param) +{ + struct moxart_host *host = param; + + dev_dbg(mmc_dev(host->mmc), "%s: host=%p\n", __func__, host); + complete(&host->dma_complete); +} + +static void moxart_transfer_dma(struct mmc_data *data, struct moxart_host *host) +{ + unsigned int len, direction_dev; + struct dma_async_tx_descriptor *desc = NULL; + + if (host->size == data->bytes_xfered) + return; + + direction_dev = (data->flags & MMC_DATA_WRITE) ? + DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; + + /* + * because dma_map_sg takes both sg and sg_len as arguments + * (and maps the entire list of buffers) data->sg does not + * have to be incremented between calls (as is required + * in moxart_transfer_pio) + */ + len = dma_map_sg(host->dma_chan_cur->device->dev, data->sg, + data->sg_len, host->dma_direction); + + if (len > 0) { + desc = dmaengine_prep_slave_sg(host->dma_chan_cur, data->sg, + len, direction_dev, + DMA_PREP_INTERRUPT | + DMA_CTRL_ACK); + } else { + pr_err("%s: dma_map_sg returned zero length\n", + __func__); + } + + if (desc) { + desc->callback = moxart_dma_complete; + desc->callback_param = host; + dmaengine_submit(desc); + dma_async_issue_pending(host->dma_chan_cur); + } + + data->bytes_xfered += host->remain; +} + +/* when DMA is available this is used only for SD_APP_SEND_SCR */ +static void moxart_transfer_pio(struct moxart_host *host) +{ + unsigned char *buffer; + unsigned int wcnt, i; + struct mmc_data *data = host->mrq->cmd->data; + + if (host->size == data->bytes_xfered) + goto transfer_complete; + + buffer = sg_virt(host->cur_sg); + wcnt = host->remain >> 2; + + if (data->flags & MMC_DATA_WRITE) { + for (i = 0; i < wcnt; i++, buffer += 4) { + writel(*(unsigned int *)buffer, + host->base + REG_DATA_WINDOW); + udelay(10); + } + } else { + for (i = 0; i < wcnt; i++, buffer += 4) { + /* byte order reversed only when reading SCR */ + if (data->mrq->cmd->opcode == SD_APP_SEND_SCR) { + *(unsigned int *)buffer = ioread32be( + host->base + REG_DATA_WINDOW); + } else { + *(unsigned int *)buffer = + readl(host->base + REG_DATA_WINDOW); + } + udelay(10); + } + } + wcnt <<= 2; + host->remain -= wcnt; + data->bytes_xfered += wcnt; + + if (host->size != data->bytes_xfered) { + moxart_next_sg(host); + /* + * used to goto "transfer_start" label here, + * there is no need, this function will be + * called again from interrupt. + * + * compare with DMA where sg increment is + * redundant thanks to dma_map_sg + */ + } else { + complete(&host->pio_complete); + } + +transfer_complete: + dev_dbg(mmc_dev(host->mmc), "%s: host->size=%d host->remain=%u\n", + __func__, host->size, host->remain); +} + +static void moxart_prepare_data(struct moxart_host *host) +{ + struct mmc_data *data = host->mrq->cmd->data; + unsigned int timeout, datactrl; + int blksz_bits; + + dev_dbg(mmc_dev(host->mmc), "%s\n", __func__); + + if (!data) + return; + + host->size = data->blocks * data->blksz; + blksz_bits = ffs(data->blksz) - 1; + BUG_ON(1 << blksz_bits != data->blksz); + + moxart_init_sg(host, data); + + timeout = (host->mmc->f_max / 1000) * (data->timeout_ns / 1000); + timeout *= 2; + + datactrl = (blksz_bits & MSD_BLK_SIZE_MASK) | MSD_DATA_EN; + + if (data->flags & MMC_DATA_WRITE) + datactrl |= MSD_DATA_WRITE; + + if (((host->size > MSD_FIFO_LENB) || DMA_FIFO_LEN_FORCE) + && host->have_dma) { + datactrl |= MSD_DMA_EN; + } + + dev_dbg(mmc_dev(host->mmc), "%s: blocks=%d blksz=%d datactrl=0x%08x\n", + __func__, data->blocks, data->blksz, datactrl); + dev_dbg(mmc_dev(host->mmc), "%s: timeout=%u timeout_ns=%u\n", + __func__, timeout, data->timeout_ns); + + writel(timeout, host->base + REG_DATA_TIMER); + writel(host->size, host->base + REG_DATA_LENGTH); + writel(datactrl, host->base + REG_DATA_CONTROL); +} + +static void moxart_transfer_check(struct mmc_data *data, + struct moxart_host *host) +{ + unsigned int status, count = 0; + + dev_dbg(mmc_dev(host->mmc), "%s\n", __func__); + + while (1) { + udelay(10); + status = readl(host->base + REG_STATUS); + if (status & (MSD_DATA_CRC_OK | MSD_DATA_CRC_FAIL + | MSD_DATA_END) || count > 10) + break; + dev_dbg(mmc_dev(host->mmc), "%s: waiting for status=%08x ..\n", + __func__, status); + count++; + } + if (status & MSD_DATA_CRC_OK) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_DATA_CRC_OK\n", __func__); + writel(MSD_DATA_CRC_OK, host->base + REG_CLEAR); + } + if (status & MSD_DATA_CRC_FAIL) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_DATA_CRC_FAIL\n", + __func__); + writel(MSD_DATA_CRC_FAIL, host->base + REG_CLEAR); + data->error = MMC_ERR_TIMEOUT; + } + if (status & MSD_DATA_END) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_DATA_END\n", + __func__); + writel(MSD_DATA_END, host->base + REG_CLEAR); + } + if (status & MSD_DATA_TIMEOUT) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_DATA_TIMEOUT\n", + __func__); + writel(MSD_DATA_TIMEOUT, host->base + REG_CLEAR); + } +} + +static void moxart_card_change(struct moxart_host *host) +{ + int delay; + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + + if (readl(host->base + REG_STATUS) & MSD_CARD_DETECT) { + dev_dbg(mmc_dev(host->mmc), "%s: card removed\n", __func__); + if (host->have_dma && host->size > MSD_FIFO_LENB) { + dev_dbg(mmc_dev(host->mmc), "%s: call dmaengine_terminate_all\n", + __func__); + dmaengine_terminate_all(host->dma_chan_rx); + dmaengine_terminate_all(host->dma_chan_tx); + } + host->removed = true; + delay = 0; + } else { + dev_dbg(mmc_dev(host->mmc), "%s: card inserted\n", __func__); + host->removed = false; + delay = 500; + } + + /* + * clearing FIFO interrupts here does not stop a follow up + * MSD_FIFO_*RUN after MSD_CARD_CHANGE. instead, check + * host->mrq != NULL in moxart_irq to avoid unnecessary calls + * to moxart_transfer_pio + * if this happens during transfer the mmc_request in + * moxart_request should still be valid + * (which is why host->mrq can be set NULL here) + */ + host->mrq = NULL; + writel(MSD_CARD_CHANGE | MSD_FIFO_ORUN | MSD_FIFO_URUN, + host->base + REG_CLEAR); + writel(MSD_CARD_CHANGE, host->base + REG_INTERRUPT_MASK); + + spin_unlock_irqrestore(&host->lock, flags); + dev_dbg(mmc_dev(host->mmc), "%s: call mmc_detect_change\n", __func__); + mmc_detect_change(host->mmc, msecs_to_jiffies(delay)); +} + +static void moxart_request(struct mmc_host *mmc, struct mmc_request *mrq) +{ + struct moxart_host *host = mmc_priv(mmc); + unsigned long dma_time, pio_time, flags; + unsigned int status; + + dev_dbg(mmc_dev(host->mmc), "%s\n", __func__); + + spin_lock_irqsave(&host->lock, flags); + + init_completion(&host->dma_complete); + init_completion(&host->pio_complete); + + host->mrq = mrq; + + if (readl(host->base + REG_STATUS) & MSD_CARD_DETECT) { + mrq->cmd->error = MMC_ERR_TIMEOUT; + goto request_done; + } + + moxart_prepare_data(host); + moxart_send_command(host, host->mrq->cmd); + + if (mrq->cmd->data) { + /* only use DMA/PIO (and wait) when there is data */ + if (((host->size > MSD_FIFO_LENB) || DMA_FIFO_LEN_FORCE) + && host->have_dma) { + + writel(MSD_CARD_CHANGE, host->base + + REG_INTERRUPT_MASK); + + spin_unlock_irqrestore(&host->lock, flags); + + host->dma_direction = (mrq->cmd->data->flags + & MMC_DATA_WRITE) ? + DMA_TO_DEVICE : DMA_FROM_DEVICE; + host->dma_chan_cur = (mrq->cmd->data->flags + & MMC_DATA_WRITE) ? + host->dma_chan_tx : + host->dma_chan_rx; + moxart_transfer_dma(mrq->cmd->data, host); + + dma_time = wait_for_completion_interruptible_timeout( + &host->dma_complete, host->timeout); + dev_dbg(mmc_dev(host->mmc), "%s: dma_time=%lu (DMA wait time)\n", + __func__, dma_time); + + dma_unmap_sg(host->dma_chan_cur->device->dev, + mrq->cmd->data->sg, mrq->cmd->data->sg_len, + host->dma_direction); + + spin_lock_irqsave(&host->lock, flags); + } else { + + writel(MSD_FIFO_URUN | MSD_FIFO_ORUN | MSD_CARD_CHANGE, + host->base + REG_INTERRUPT_MASK); + + status = readl(host->base + REG_STATUS); + dev_dbg(mmc_dev(host->mmc), "%s: status=%08x\n", + __func__, status); + + spin_unlock_irqrestore(&host->lock, flags); + + /* PIO transfer started from interrupt */ + pio_time = wait_for_completion_interruptible_timeout( + &host->pio_complete, host->timeout); + dev_dbg(mmc_dev(host->mmc), "%s: pio_time=%lu (PIO wait time)\n", + __func__, pio_time); + + spin_lock_irqsave(&host->lock, flags); + } + + /* removed during transfer? (interrupts were just enabled..) */ + if (host->removed) { + dev_dbg(mmc_dev(host->mmc), "%s: host removed during transfer!\n", + __func__); + mrq->cmd->error = MMC_ERR_TIMEOUT; + } + + moxart_transfer_check(mrq->cmd->data, host); + + if (mrq->cmd->data->stop) + moxart_send_command(host, mrq->cmd->data->stop); + } + +request_done: + spin_unlock_irqrestore(&host->lock, flags); + mmc_request_done(host->mmc, mrq); +} + +static irqreturn_t moxart_irq(int irq, void *devid) +{ + struct moxart_host *host = (struct moxart_host *)devid; + unsigned int status; + unsigned long flags; + + status = readl(host->base + REG_STATUS); + + dev_dbg(mmc_dev(host->mmc), "%s: host=%p status=%08x\n", + __func__, host, status); + + if (status & MSD_CARD_CHANGE) { + dev_dbg(mmc_dev(host->mmc), "%s: call moxart_card_change\n", + __func__); + moxart_card_change(host); + } + if (status & (MSD_FIFO_ORUN | MSD_FIFO_URUN) && host->mrq) { + writel(status & (MSD_FIFO_ORUN | MSD_FIFO_URUN), + host->base + REG_CLEAR); + dev_dbg(mmc_dev(host->mmc), "%s: call moxart_transfer_pio\n", + __func__); + spin_lock_irqsave(&host->lock, flags); + moxart_transfer_pio(host); + spin_unlock_irqrestore(&host->lock, flags); + } + + return IRQ_HANDLED; +} + +static void moxart_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct moxart_host *host = mmc_priv(mmc); + unsigned long flags; + unsigned short power; + int div; + + spin_lock_irqsave(&host->lock, flags); + if (ios->clock) { + div = (host->sysclk / (host->mmc->f_max * 2)) - 1; + + if (div > MSD_CLK_DIV_MASK) + div = MSD_CLK_DIV_MASK; + else if (div < 0) + div = 0; + + div |= MSD_CLK_SD; + writel(div, host->base + REG_CLOCK_CONTROL); + } else if (!(readl(host->base + REG_CLOCK_CONTROL) & MSD_CLK_DIS)) { + writel(readl(host->base + REG_CLOCK_CONTROL) | MSD_CLK_DIS, + host->base + REG_CLOCK_CONTROL); + } + + if (ios->power_mode == MMC_POWER_OFF) { + writel(readl(host->base + REG_POWER_CONTROL) & ~MSD_SD_POWER_ON, + host->base + REG_POWER_CONTROL); + } else { + if (ios->vdd < MIN_POWER) + power = 0; + else + power = ios->vdd - MIN_POWER; + + writel(MSD_SD_POWER_ON | (unsigned int) power, + host->base + REG_POWER_CONTROL); + } + + if (ios->bus_width == MMC_BUS_WIDTH_1) + writel(MSD_SINGLE_BUS, host->base + REG_BUS_WIDTH); + else + writel(MSD_WIDE_BUS, host->base + REG_BUS_WIDTH); + + spin_unlock_irqrestore(&host->lock, flags); +} + + +static int moxart_get_ro(struct mmc_host *mmc) +{ + struct moxart_host *host = mmc_priv(mmc); + + return readl(host->base + REG_STATUS) & MSD_WRITE_PROT; +} + +static struct mmc_host_ops moxart_ops = { + .request = moxart_request, + .set_ios = moxart_set_ios, + .get_ro = moxart_get_ro, +}; + +static int moxart_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *node = dev->of_node; + struct resource res_mmc; + struct mmc_host *mmc; + struct moxart_host *host = NULL; + void __iomem *reg_mmc; + dma_cap_mask_t mask; + int ret; + struct dma_slave_config cfg; + unsigned int irq; + struct clk *clk; + + mmc = mmc_alloc_host(sizeof(struct moxart_host), dev); + if (!mmc) { + dev_err(dev, "%s: mmc_alloc_host failed\n", __func__); + ret = -ENOMEM; + goto out; + } + + ret = of_address_to_resource(node, 0, &res_mmc); + if (ret) { + dev_err(dev, "%s: could not get MMC base resource\n", __func__); + goto out; + } + + irq = irq_of_parse_and_map(node, 0); + + reg_mmc = devm_ioremap_resource(dev, &res_mmc); + if (IS_ERR(reg_mmc)) { + dev_err(dev, "%s: devm_ioremap_resource res_mmc failed\n", + __func__); + return PTR_ERR(reg_mmc); + } + + mmc->ops = &moxart_ops; + + /* + * hardware does not support MMC_CAP_SD_HIGHSPEED + * CMD6 will timeout and make things not work + */ + mmc->caps = MMC_CAP_4_BIT_DATA; + + mmc->f_min = 400000; + mmc->f_max = 25000000; + mmc->ocr_avail = 0xffff00; /* support 2.0v - 3.6v power */ + mmc->max_segs = 32; + mmc->max_blk_size = 512; + mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size; + mmc->max_seg_size = mmc->max_req_size; + + host = mmc_priv(mmc); + host->mmc = mmc; + host->base = reg_mmc; + host->reg_phys = res_mmc.start; + host->timeout = msecs_to_jiffies(1000); + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + clk = of_clk_get(node, 0); + if (IS_ERR(clk)) { + dev_err(dev, "%s: of_clk_get failed\n", __func__); + return PTR_ERR(clk); + } + host->sysclk = clk_get_rate(clk); + + spin_lock_init(&host->lock); + + /* disable all interrupt */ + writel(0, host->base + REG_INTERRUPT_MASK); + + /* reset chip */ + writel(MSD_SDC_RST, host->base + REG_COMMAND); + + /* wait for reset finished */ + while (readl(host->base + REG_COMMAND) & MSD_SDC_RST) + udelay(10); + + host->dma_chan_tx = of_dma_request_slave_channel(node, "tx"); + host->dma_chan_rx = of_dma_request_slave_channel(node, "rx"); + + if (!host->dma_chan_rx || !host->dma_chan_tx) { + dev_dbg(dev, "%s: using PIO mode transfer\n", __func__); + + host->have_dma = false; + mmc->max_blk_count = 1; + } else { + dev_dbg(dev, "%s: using 2 DMA channels rx=%p tx=%p\n", + __func__, host->dma_chan_rx, host->dma_chan_tx); + + cfg.direction = DMA_MEM_TO_DEV; + cfg.src_addr = 0; + cfg.dst_addr = (unsigned int)host->reg_phys + MSD_DATA_WIN_REG; + cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + dmaengine_slave_config(host->dma_chan_tx, &cfg); + + cfg.direction = DMA_DEV_TO_MEM; + cfg.src_addr = (unsigned int)host->reg_phys + MSD_DATA_WIN_REG; + cfg.dst_addr = 0; + cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + dmaengine_slave_config(host->dma_chan_rx, &cfg); + + host->have_dma = true; + + /* + * there seems to be a max size on transfers so + * set max_blk_count low for both DMA and PIO + * + * sending large chunks result either in timeout + * or render the MMC controller unresponsive + * (status register 0 on consecutive read retries, + * also see comments in moxart_send_command) + * + * obviously, DMA is quicker and can handle + * larger chunks but setting it higher than 16 + * can still bug the controller + */ + mmc->max_blk_count = 16; + } + + ret = devm_request_irq(dev, irq, moxart_irq, 0, "moxart-mmc", host); + + if (ret) + goto out; + + dev_set_drvdata(dev, mmc); + mmc_add_host(mmc); + + dev_dbg(dev, "%s: IRQ=%d\n", __func__, irq); + + return 0; + +out: + if (mmc) + mmc_free_host(mmc); + return ret; +} + +static void moxart_release_dma(struct moxart_host *host) +{ + if (host->dma_chan_tx) { + struct dma_chan *chan = host->dma_chan_tx; + host->dma_chan_tx = NULL; + dma_release_channel(chan); + } + if (host->dma_chan_rx) { + struct dma_chan *chan = host->dma_chan_rx; + host->dma_chan_rx = NULL; + dma_release_channel(chan); + } +} + +static int moxart_remove(struct platform_device *pdev) +{ + struct mmc_host *mmc = dev_get_drvdata(&pdev->dev); + struct moxart_host *host = mmc_priv(mmc); + + dev_set_drvdata(&pdev->dev, NULL); + + if (mmc) { + moxart_release_dma(host); + mmc_remove_host(mmc); + mmc_free_host(mmc); + + writel(0, host->base + REG_INTERRUPT_MASK); + writel(0, host->base + REG_POWER_CONTROL); + writel(readl(host->base + REG_CLOCK_CONTROL) | MSD_CLK_DIS, + host->base + REG_CLOCK_CONTROL); + } + + kfree(host); + + return 0; +} + +static const struct of_device_id moxart_mmc_match[] = { + { .compatible = "moxa,moxart-mmc" }, + { } +}; + +static struct platform_driver moxart_mmc_driver = { + .probe = moxart_probe, + .remove = moxart_remove, + .driver = { + .name = "sdhci-moxart", + .owner = THIS_MODULE, + .of_match_table = moxart_mmc_match, + }, +}; +module_platform_driver(moxart_mmc_driver); + +MODULE_ALIAS("platform:sdhci-moxart"); +MODULE_DESCRIPTION("MOXART SDHCI driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Jonas Jensen ");