| Message ID | 1368731117-4749-6-git-send-email-dinguyen@altera.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi! > Add platform specific functionality for the DW SD/MMC driver for > SoCFPGA. Move SDMMC_CMD_USE_HOLD_REG to dw_mmc.h so other platforms > can use this define. > --- /dev/null > +++ b/drivers/mmc/host/dw_mmc-socfpga.c > @@ -0,0 +1,139 @@ > +/* > + * Altera SoCFPGA Specific Extensions for Synopsys DW Multimedia Card Interface driver > + * > + * Copyright (C) 2012, Samsung Electronics Co., Ltd. > + * Copyright (C) 2013 Altera Corporation > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * Taken from dw_mmc_exynos.c Actually it is dw_mmc-exynos.c > +#define SYSMGR_SDMMCGRP_CTRL_OFFSET 0x108 > +#define DRV_CLK_PHASE_SHIFT_SEL_MASK 0x7 > +#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel) \ > + ((((drvsel) << 0) & 0x7) | (((smplsel) << 3) & 0x38)) Should SYSMGR stuff go to shared header file somewhere? > +extern void __iomem *sys_manager_base_addr; This is unused. > +/* SOCFPGA implementation specific driver private data */ > +struct dw_mci_socfpga_priv_data { > + u8 ciu_div; comment would be nice, something like /* card interface unit divisor */ ? > + u32 hs_timing; /* card interface unit phase shift for RX/TX mode */ ? > +static int dw_mci_socfpga_setup_clock(struct dw_mci *host) > +{ > + struct dw_mci_socfpga_priv_data *priv = host->priv; > + > + clk_disable(host->ciu_clk); > + regmap_write(priv->sysreg, SYSMGR_SDMMCGRP_CTRL_OFFSET, priv->hs_timing); > + clk_enable(host->ciu_clk); > + > + host->bus_hz /= (priv->ciu_div + 1); Previous version said: + host->bus_hz /= priv->ciu_div; I see you want to avoid division by zero, but this will introduce significant error for low divisors, right? Is divisor of 0 valid? Otherwise it looks good. Thanks, Pavel
On 05/17/13 4:05, Dinh Nguyen wrote: > From: Dinh Nguyen <dinguyen@altera.com> > > Add platform specific functionality for the DW SD/MMC driver for > SoCFPGA. Move SDMMC_CMD_USE_HOLD_REG to dw_mmc.h so other platforms > can use this define. > > Signed-off-by: Dinh Nguyen <dinguyen@altera.com> > CC: Seungwon Jeon <tgih.jun@samsung.com> > CC: Jaehoon Chung <jh80.chung@samsung.com> > CC: Arnd Bergmann <arnd@arndb.de> > CC: Olof Johansson <olof@lixom.net> > CC: Pavel Machek <pavel@denx.de> > CC: linux-mmc@vger.kernel.org > > v2: > - Use syscon and regmap > - Avoid divide by zero > - Remove the need to set PWR_EN > --- > drivers/mmc/host/Kconfig | 8 +++ > drivers/mmc/host/Makefile | 1 + > drivers/mmc/host/dw_mmc-exynos.c | 2 - > drivers/mmc/host/dw_mmc-socfpga.c | 139 +++++++++++++++++++++++++++++++++++++ > drivers/mmc/host/dw_mmc.h | 1 + > 5 files changed, 149 insertions(+), 2 deletions(-) > create mode 100644 drivers/mmc/host/dw_mmc-socfpga.c > > diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig > index 9ab8f8d..1be2289 100644 > --- a/drivers/mmc/host/Kconfig > +++ b/drivers/mmc/host/Kconfig > @@ -556,6 +556,14 @@ config MMC_DW_EXYNOS > Synopsys DesignWare Memory Card Interface driver. Select this option > for platforms based on Exynos4 and Exynos5 SoC's. > > +config MMC_DW_SOCFPGA > + tristate "SOCFPGA specific extensions for Synopsys DW Memory Card Interface" > + depends on MMC_DW > + select MMC_DW_PLTFM > + help > + This selects support for Altera SoCFPGA specific extensions to the > + Synopsys DesignWare Memory Card Interface driver. > + > config MMC_DW_PCI > tristate "Synopsys Designware MCI support on PCI bus" > depends on MMC_DW && PCI > diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile > index cd32280..67718c1 100644 > --- a/drivers/mmc/host/Makefile > +++ b/drivers/mmc/host/Makefile > @@ -42,6 +42,7 @@ obj-$(CONFIG_SDH_BFIN) += bfin_sdh.o > obj-$(CONFIG_MMC_DW) += dw_mmc.o > obj-$(CONFIG_MMC_DW_PLTFM) += dw_mmc-pltfm.o > obj-$(CONFIG_MMC_DW_EXYNOS) += dw_mmc-exynos.o > +obj-$(CONFIG_MMC_DW_SOCFPGA) += dw_mmc-socfpga.o > obj-$(CONFIG_MMC_DW_PCI) += dw_mmc-pci.o > obj-$(CONFIG_MMC_SH_MMCIF) += sh_mmcif.o > obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o > diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c > index f013e7e..866edef 100644 > --- a/drivers/mmc/host/dw_mmc-exynos.c > +++ b/drivers/mmc/host/dw_mmc-exynos.c > @@ -31,8 +31,6 @@ > SDMMC_CLKSEL_CCLK_DRIVE(y) | \ > SDMMC_CLKSEL_CCLK_DIVIDER(z)) > > -#define SDMMC_CMD_USE_HOLD_REG BIT(29) > - > #define EXYNOS4210_FIXED_CIU_CLK_DIV 2 > #define EXYNOS4412_FIXED_CIU_CLK_DIV 4 > > diff --git a/drivers/mmc/host/dw_mmc-socfpga.c b/drivers/mmc/host/dw_mmc-socfpga.c > new file mode 100644 > index 0000000..af89685 > --- /dev/null > +++ b/drivers/mmc/host/dw_mmc-socfpga.c > @@ -0,0 +1,139 @@ > +/* > + * Altera SoCFPGA Specific Extensions for Synopsys DW Multimedia Card Interface driver > + * > + * Copyright (C) 2012, Samsung Electronics Co., Ltd. > + * Copyright (C) 2013 Altera Corporation > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * Taken from dw_mmc_exynos.c > + */ > +#include <linux/clk.h> > +#include <linux/mfd/syscon.h> > +#include <linux/mmc/host.h> > +#include <linux/mmc/dw_mmc.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > + > +#include "dw_mmc.h" > +#include "dw_mmc-pltfm.h" > + > +#define SYSMGR_SDMMCGRP_CTRL_OFFSET 0x108 > +#define DRV_CLK_PHASE_SHIFT_SEL_MASK 0x7 > +#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel) \ > + ((((drvsel) << 0) & 0x7) | (((smplsel) << 3) & 0x38)) Did you check Jaehoon Chung's comment? It's trivial, but more common. ((((smplsel) & 0x38) << 3) | (((drvsel) & 0x7) << 0)) > + > +extern void __iomem *sys_manager_base_addr; > + > +/* SOCFPGA implementation specific driver private data */ > +struct dw_mci_socfpga_priv_data { > + u8 ciu_div; > + u32 hs_timing; > + struct regmap *sysreg; > +}; > + > +static int dw_mci_socfpga_priv_init(struct dw_mci *host) > +{ > + struct dw_mci_socfpga_priv_data *priv; > + struct device *dev = host->dev; > + > + priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) { > + dev_err(host->dev, "mem alloc failed for private data\n"); > + return -ENOMEM; > + } > + > + host->priv = priv; > + return 0; > +} > + > +static int dw_mci_socfpga_setup_clock(struct dw_mci *host) > +{ > + struct dw_mci_socfpga_priv_data *priv = host->priv; > + > + clk_disable(host->ciu_clk); > + regmap_write(priv->sysreg, SYSMGR_SDMMCGRP_CTRL_OFFSET, priv->hs_timing); > + clk_enable(host->ciu_clk); You can use clk_prepare_enable/clk_disable_unprepare instead of clk_enable/clk_disable. > + > + host->bus_hz /= (priv->ciu_div + 1); > + return 0; > +} > + > +static void dw_mci_socfpga_prepare_command(struct dw_mci *host, u32 *cmdr) > +{ > + struct dw_mci_socfpga_priv_data *priv = host->priv; > + > + if (priv->hs_timing & DRV_CLK_PHASE_SHIFT_SEL_MASK) > + *cmdr |= SDMMC_CMD_USE_HOLD_REG; > +} > + > +static int dw_mci_socfpga_parse_dt(struct dw_mci *host) > +{ > + struct dw_mci_socfpga_priv_data *priv = host->priv; > + struct device_node *np = host->dev->of_node; > + u32 timing[2]; > + u32 div = 0; > + int ret; > + > + priv->sysreg = syscon_regmap_lookup_by_compatible("altr,sys-mgr"); How about placing syscon_regmap_lookup_by_compatible in dw_mci_socfpga_priv_init. It seems more proper place. > + if (IS_ERR(priv->sysreg)) { > + dev_err(host->dev, "regmap for altr,sys-mgr lookup failed.\n"); > + return PTR_ERR(priv->sysreg); > + } > + > + of_property_read_u32(np, "altr,dw-mshc-ciu-div", &div); Error check would be helpful. ret = of_property_read_u32(); Thanks, Seungwon Jeon > + priv->ciu_div = div; > + > + ret = of_property_read_u32_array(np, > + "altr,dw-mshc-sdr-timing", timing, 2); > + if (ret) > + return ret; > + > + priv->hs_timing = SYSMGR_SDMMC_CTRL_SET(timing[0], timing[1]); > + return 0; > +} > + > +static const struct dw_mci_drv_data socfpga_drv_data = { > + .init = dw_mci_socfpga_priv_init, > + .setup_clock = dw_mci_socfpga_setup_clock, > + .prepare_command = dw_mci_socfpga_prepare_command, > + .parse_dt = dw_mci_socfpga_parse_dt, > +}; > + > +static const struct of_device_id dw_mci_socfpga_match[] = { > + { .compatible = "altr,socfpga-dw-mshc", > + .data = &socfpga_drv_data, }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, dw_mci_socfpga_match); > + > +int dw_mci_socfpga_probe(struct platform_device *pdev) > +{ > + const struct dw_mci_drv_data *drv_data; > + const struct of_device_id *match; > + > + match = of_match_node(dw_mci_socfpga_match, pdev->dev.of_node); > + drv_data = match->data; > + return dw_mci_pltfm_register(pdev, drv_data); > +} > + > +static struct platform_driver dw_mci_socfpga_pltfm_driver = { > + .probe = dw_mci_socfpga_probe, > + .remove = __exit_p(dw_mci_pltfm_remove), > + .driver = { > + .name = "dwmmc_socfpga", > + .of_match_table = of_match_ptr(dw_mci_socfpga_match), > + .pm = &dw_mci_pltfm_pmops, > + }, > +}; > + > +module_platform_driver(dw_mci_socfpga_pltfm_driver); > + > +MODULE_DESCRIPTION("Altera SOCFPGA Specific DW-MSHC Driver Extension"); > +MODULE_LICENSE("GPL v2"); > +MODULE_ALIAS("platform:dwmmc-socfpga"); > diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h > index 0b74189..3700cb2 100644 > --- a/drivers/mmc/host/dw_mmc.h > +++ b/drivers/mmc/host/dw_mmc.h > @@ -111,6 +111,7 @@ > #define SDMMC_INT_ERROR 0xbfc2 > /* Command register defines */ > #define SDMMC_CMD_START BIT(31) > +#define SDMMC_CMD_USE_HOLD_REG BIT(29) > #define SDMMC_CMD_CCS_EXP BIT(23) > #define SDMMC_CMD_CEATA_RD BIT(22) > #define SDMMC_CMD_UPD_CLK BIT(21) > -- > 1.7.9.5 > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Pavel, On 05/17/2013 06:46 AM, Pavel Machek wrote: > Hi! > >> Add platform specific functionality for the DW SD/MMC driver for >> SoCFPGA. Move SDMMC_CMD_USE_HOLD_REG to dw_mmc.h so other platforms >> can use this define. > >> --- /dev/null >> +++ b/drivers/mmc/host/dw_mmc-socfpga.c >> @@ -0,0 +1,139 @@ >> +/* >> + * Altera SoCFPGA Specific Extensions for Synopsys DW Multimedia Card Interface driver >> + * >> + * Copyright (C) 2012, Samsung Electronics Co., Ltd. >> + * Copyright (C) 2013 Altera Corporation >> + * >> + * This program is free software; you can redistribute it and/or modify >> + * it under the terms of the GNU General Public License as published by >> + * the Free Software Foundation; either version 2 of the License, or >> + * (at your option) any later version. >> + * >> + * Taken from dw_mmc_exynos.c > > Actually it is dw_mmc-exynos.c Will fix in rev3. > >> +#define SYSMGR_SDMMCGRP_CTRL_OFFSET 0x108 >> +#define DRV_CLK_PHASE_SHIFT_SEL_MASK 0x7 >> +#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel) \ >> + ((((drvsel) << 0) & 0x7) | (((smplsel) << 3) & 0x38)) > > Should SYSMGR stuff go to shared header file somewhere? > >> +extern void __iomem *sys_manager_base_addr; > > This is unused. Will remove. > >> +/* SOCFPGA implementation specific driver private data */ >> +struct dw_mci_socfpga_priv_data { >> + u8 ciu_div; > > comment would be nice, something like > /* card interface unit divisor */ ? > >> + u32 hs_timing; > > /* card interface unit phase shift for RX/TX mode */ > ? Will add comments. > >> +static int dw_mci_socfpga_setup_clock(struct dw_mci *host) >> +{ >> + struct dw_mci_socfpga_priv_data *priv = host->priv; >> + >> + clk_disable(host->ciu_clk); >> + regmap_write(priv->sysreg, SYSMGR_SDMMCGRP_CTRL_OFFSET, priv->hs_timing); >> + clk_enable(host->ciu_clk); >> + >> + host->bus_hz /= (priv->ciu_div + 1); > > Previous version said: > > + host->bus_hz /= priv->ciu_div; > > I see you want to avoid division by zero, but this will introduce > significant error for low divisors, right? Is divisor of 0 valid? Divisor of 0 is not valid. Not sure what you mean my low divisos? Thanks, Dinh > > Otherwise it looks good. Thanks, > Pavel >
Hi Seungwon, On 05/20/2013 12:40 AM, Seungwon Jeon wrote: > On 05/17/13 4:05, Dinh Nguyen wrote: >> From: Dinh Nguyen <dinguyen@altera.com> >> >> Add platform specific functionality for the DW SD/MMC driver for >> SoCFPGA. Move SDMMC_CMD_USE_HOLD_REG to dw_mmc.h so other platforms >> can use this define. >> >> Signed-off-by: Dinh Nguyen <dinguyen@altera.com> >> CC: Seungwon Jeon <tgih.jun@samsung.com> >> CC: Jaehoon Chung <jh80.chung@samsung.com> >> CC: Arnd Bergmann <arnd@arndb.de> >> CC: Olof Johansson <olof@lixom.net> >> CC: Pavel Machek <pavel@denx.de> >> CC: linux-mmc@vger.kernel.org >> >> v2: >> - Use syscon and regmap >> - Avoid divide by zero >> - Remove the need to set PWR_EN >> --- >> drivers/mmc/host/Kconfig | 8 +++ >> drivers/mmc/host/Makefile | 1 + >> drivers/mmc/host/dw_mmc-exynos.c | 2 - >> drivers/mmc/host/dw_mmc-socfpga.c | 139 +++++++++++++++++++++++++++++++++++++ >> drivers/mmc/host/dw_mmc.h | 1 + >> 5 files changed, 149 insertions(+), 2 deletions(-) >> create mode 100644 drivers/mmc/host/dw_mmc-socfpga.c >> >> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig >> index 9ab8f8d..1be2289 100644 >> --- a/drivers/mmc/host/Kconfig >> +++ b/drivers/mmc/host/Kconfig >> @@ -556,6 +556,14 @@ config MMC_DW_EXYNOS >> Synopsys DesignWare Memory Card Interface driver. Select this option >> for platforms based on Exynos4 and Exynos5 SoC's. >> >> +config MMC_DW_SOCFPGA >> + tristate "SOCFPGA specific extensions for Synopsys DW Memory Card Interface" >> + depends on MMC_DW >> + select MMC_DW_PLTFM >> + help >> + This selects support for Altera SoCFPGA specific extensions to the >> + Synopsys DesignWare Memory Card Interface driver. >> + >> config MMC_DW_PCI >> tristate "Synopsys Designware MCI support on PCI bus" >> depends on MMC_DW && PCI >> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile >> index cd32280..67718c1 100644 >> --- a/drivers/mmc/host/Makefile >> +++ b/drivers/mmc/host/Makefile >> @@ -42,6 +42,7 @@ obj-$(CONFIG_SDH_BFIN) += bfin_sdh.o >> obj-$(CONFIG_MMC_DW) += dw_mmc.o >> obj-$(CONFIG_MMC_DW_PLTFM) += dw_mmc-pltfm.o >> obj-$(CONFIG_MMC_DW_EXYNOS) += dw_mmc-exynos.o >> +obj-$(CONFIG_MMC_DW_SOCFPGA) += dw_mmc-socfpga.o >> obj-$(CONFIG_MMC_DW_PCI) += dw_mmc-pci.o >> obj-$(CONFIG_MMC_SH_MMCIF) += sh_mmcif.o >> obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o >> diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c >> index f013e7e..866edef 100644 >> --- a/drivers/mmc/host/dw_mmc-exynos.c >> +++ b/drivers/mmc/host/dw_mmc-exynos.c >> @@ -31,8 +31,6 @@ >> SDMMC_CLKSEL_CCLK_DRIVE(y) | \ >> SDMMC_CLKSEL_CCLK_DIVIDER(z)) >> >> -#define SDMMC_CMD_USE_HOLD_REG BIT(29) >> - >> #define EXYNOS4210_FIXED_CIU_CLK_DIV 2 >> #define EXYNOS4412_FIXED_CIU_CLK_DIV 4 >> >> diff --git a/drivers/mmc/host/dw_mmc-socfpga.c b/drivers/mmc/host/dw_mmc-socfpga.c >> new file mode 100644 >> index 0000000..af89685 >> --- /dev/null >> +++ b/drivers/mmc/host/dw_mmc-socfpga.c >> @@ -0,0 +1,139 @@ >> +/* >> + * Altera SoCFPGA Specific Extensions for Synopsys DW Multimedia Card Interface driver >> + * >> + * Copyright (C) 2012, Samsung Electronics Co., Ltd. >> + * Copyright (C) 2013 Altera Corporation >> + * >> + * This program is free software; you can redistribute it and/or modify >> + * it under the terms of the GNU General Public License as published by >> + * the Free Software Foundation; either version 2 of the License, or >> + * (at your option) any later version. >> + * >> + * Taken from dw_mmc_exynos.c >> + */ >> +#include <linux/clk.h> >> +#include <linux/mfd/syscon.h> >> +#include <linux/mmc/host.h> >> +#include <linux/mmc/dw_mmc.h> >> +#include <linux/module.h> >> +#include <linux/of.h> >> +#include <linux/platform_device.h> >> +#include <linux/regmap.h> >> + >> +#include "dw_mmc.h" >> +#include "dw_mmc-pltfm.h" >> + >> +#define SYSMGR_SDMMCGRP_CTRL_OFFSET 0x108 >> +#define DRV_CLK_PHASE_SHIFT_SEL_MASK 0x7 >> +#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel) \ >> + ((((drvsel) << 0) & 0x7) | (((smplsel) << 3) & 0x38)) > Did you check Jaehoon Chung's comment? > It's trivial, but more common. > ((((smplsel) & 0x38) << 3) | (((drvsel) & 0x7) << 0)) > Yes, I missed the comment. Will change in rev3. >> + >> +extern void __iomem *sys_manager_base_addr; >> + >> +/* SOCFPGA implementation specific driver private data */ >> +struct dw_mci_socfpga_priv_data { >> + u8 ciu_div; >> + u32 hs_timing; >> + struct regmap *sysreg; >> +}; >> + >> +static int dw_mci_socfpga_priv_init(struct dw_mci *host) >> +{ >> + struct dw_mci_socfpga_priv_data *priv; >> + struct device *dev = host->dev; >> + >> + priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL); >> + if (!priv) { >> + dev_err(host->dev, "mem alloc failed for private data\n"); >> + return -ENOMEM; >> + } >> + >> + host->priv = priv; >> + return 0; >> +} >> + >> +static int dw_mci_socfpga_setup_clock(struct dw_mci *host) >> +{ >> + struct dw_mci_socfpga_priv_data *priv = host->priv; >> + >> + clk_disable(host->ciu_clk); >> + regmap_write(priv->sysreg, SYSMGR_SDMMCGRP_CTRL_OFFSET, priv->hs_timing); >> + clk_enable(host->ciu_clk); > You can use clk_prepare_enable/clk_disable_unprepare instead of clk_enable/clk_disable. > OK. >> + >> + host->bus_hz /= (priv->ciu_div + 1); >> + return 0; >> +} >> + >> +static void dw_mci_socfpga_prepare_command(struct dw_mci *host, u32 *cmdr) >> +{ >> + struct dw_mci_socfpga_priv_data *priv = host->priv; >> + >> + if (priv->hs_timing & DRV_CLK_PHASE_SHIFT_SEL_MASK) >> + *cmdr |= SDMMC_CMD_USE_HOLD_REG; >> +} >> + >> +static int dw_mci_socfpga_parse_dt(struct dw_mci *host) >> +{ >> + struct dw_mci_socfpga_priv_data *priv = host->priv; >> + struct device_node *np = host->dev->of_node; >> + u32 timing[2]; >> + u32 div = 0; >> + int ret; >> + >> + priv->sysreg = syscon_regmap_lookup_by_compatible("altr,sys-mgr"); > How about placing syscon_regmap_lookup_by_compatible in dw_mci_socfpga_priv_init. > It seems more proper place. > Ok, will move. >> + if (IS_ERR(priv->sysreg)) { >> + dev_err(host->dev, "regmap for altr,sys-mgr lookup failed.\n"); >> + return PTR_ERR(priv->sysreg); >> + } >> + >> + of_property_read_u32(np, "altr,dw-mshc-ciu-div", &div); > Error check would be helpful. > ret = of_property_read_u32(); > > Thanks, > Seungwon Jeon > Thanks for the review. Dinh >> + priv->ciu_div = div; >> + >> + ret = of_property_read_u32_array(np, >> + "altr,dw-mshc-sdr-timing", timing, 2); >> + if (ret) >> + return ret; >> + >> + priv->hs_timing = SYSMGR_SDMMC_CTRL_SET(timing[0], timing[1]); >> + return 0; >> +} >> + >> +static const struct dw_mci_drv_data socfpga_drv_data = { >> + .init = dw_mci_socfpga_priv_init, >> + .setup_clock = dw_mci_socfpga_setup_clock, >> + .prepare_command = dw_mci_socfpga_prepare_command, >> + .parse_dt = dw_mci_socfpga_parse_dt, >> +}; >> + >> +static const struct of_device_id dw_mci_socfpga_match[] = { >> + { .compatible = "altr,socfpga-dw-mshc", >> + .data = &socfpga_drv_data, }, >> + {}, >> +}; >> +MODULE_DEVICE_TABLE(of, dw_mci_socfpga_match); >> + >> +int dw_mci_socfpga_probe(struct platform_device *pdev) >> +{ >> + const struct dw_mci_drv_data *drv_data; >> + const struct of_device_id *match; >> + >> + match = of_match_node(dw_mci_socfpga_match, pdev->dev.of_node); >> + drv_data = match->data; >> + return dw_mci_pltfm_register(pdev, drv_data); >> +} >> + >> +static struct platform_driver dw_mci_socfpga_pltfm_driver = { >> + .probe = dw_mci_socfpga_probe, >> + .remove = __exit_p(dw_mci_pltfm_remove), >> + .driver = { >> + .name = "dwmmc_socfpga", >> + .of_match_table = of_match_ptr(dw_mci_socfpga_match), >> + .pm = &dw_mci_pltfm_pmops, >> + }, >> +}; >> + >> +module_platform_driver(dw_mci_socfpga_pltfm_driver); >> + >> +MODULE_DESCRIPTION("Altera SOCFPGA Specific DW-MSHC Driver Extension"); >> +MODULE_LICENSE("GPL v2"); >> +MODULE_ALIAS("platform:dwmmc-socfpga"); >> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h >> index 0b74189..3700cb2 100644 >> --- a/drivers/mmc/host/dw_mmc.h >> +++ b/drivers/mmc/host/dw_mmc.h >> @@ -111,6 +111,7 @@ >> #define SDMMC_INT_ERROR 0xbfc2 >> /* Command register defines */ >> #define SDMMC_CMD_START BIT(31) >> +#define SDMMC_CMD_USE_HOLD_REG BIT(29) >> #define SDMMC_CMD_CCS_EXP BIT(23) >> #define SDMMC_CMD_CEATA_RD BIT(22) >> #define SDMMC_CMD_UPD_CLK BIT(21) >> -- >> 1.7.9.5 >> >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index 9ab8f8d..1be2289 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -556,6 +556,14 @@ config MMC_DW_EXYNOS Synopsys DesignWare Memory Card Interface driver. Select this option for platforms based on Exynos4 and Exynos5 SoC's. +config MMC_DW_SOCFPGA + tristate "SOCFPGA specific extensions for Synopsys DW Memory Card Interface" + depends on MMC_DW + select MMC_DW_PLTFM + help + This selects support for Altera SoCFPGA specific extensions to the + Synopsys DesignWare Memory Card Interface driver. + config MMC_DW_PCI tristate "Synopsys Designware MCI support on PCI bus" depends on MMC_DW && PCI diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index cd32280..67718c1 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile @@ -42,6 +42,7 @@ obj-$(CONFIG_SDH_BFIN) += bfin_sdh.o obj-$(CONFIG_MMC_DW) += dw_mmc.o obj-$(CONFIG_MMC_DW_PLTFM) += dw_mmc-pltfm.o obj-$(CONFIG_MMC_DW_EXYNOS) += dw_mmc-exynos.o +obj-$(CONFIG_MMC_DW_SOCFPGA) += dw_mmc-socfpga.o obj-$(CONFIG_MMC_DW_PCI) += dw_mmc-pci.o obj-$(CONFIG_MMC_SH_MMCIF) += sh_mmcif.o obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c index f013e7e..866edef 100644 --- a/drivers/mmc/host/dw_mmc-exynos.c +++ b/drivers/mmc/host/dw_mmc-exynos.c @@ -31,8 +31,6 @@ SDMMC_CLKSEL_CCLK_DRIVE(y) | \ SDMMC_CLKSEL_CCLK_DIVIDER(z)) -#define SDMMC_CMD_USE_HOLD_REG BIT(29) - #define EXYNOS4210_FIXED_CIU_CLK_DIV 2 #define EXYNOS4412_FIXED_CIU_CLK_DIV 4 diff --git a/drivers/mmc/host/dw_mmc-socfpga.c b/drivers/mmc/host/dw_mmc-socfpga.c new file mode 100644 index 0000000..af89685 --- /dev/null +++ b/drivers/mmc/host/dw_mmc-socfpga.c @@ -0,0 +1,139 @@ +/* + * Altera SoCFPGA Specific Extensions for Synopsys DW Multimedia Card Interface driver + * + * Copyright (C) 2012, Samsung Electronics Co., Ltd. + * Copyright (C) 2013 Altera Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * Taken from dw_mmc_exynos.c + */ +#include <linux/clk.h> +#include <linux/mfd/syscon.h> +#include <linux/mmc/host.h> +#include <linux/mmc/dw_mmc.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +#include "dw_mmc.h" +#include "dw_mmc-pltfm.h" + +#define SYSMGR_SDMMCGRP_CTRL_OFFSET 0x108 +#define DRV_CLK_PHASE_SHIFT_SEL_MASK 0x7 +#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel) \ + ((((drvsel) << 0) & 0x7) | (((smplsel) << 3) & 0x38)) + +extern void __iomem *sys_manager_base_addr; + +/* SOCFPGA implementation specific driver private data */ +struct dw_mci_socfpga_priv_data { + u8 ciu_div; + u32 hs_timing; + struct regmap *sysreg; +}; + +static int dw_mci_socfpga_priv_init(struct dw_mci *host) +{ + struct dw_mci_socfpga_priv_data *priv; + struct device *dev = host->dev; + + priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) { + dev_err(host->dev, "mem alloc failed for private data\n"); + return -ENOMEM; + } + + host->priv = priv; + return 0; +} + +static int dw_mci_socfpga_setup_clock(struct dw_mci *host) +{ + struct dw_mci_socfpga_priv_data *priv = host->priv; + + clk_disable(host->ciu_clk); + regmap_write(priv->sysreg, SYSMGR_SDMMCGRP_CTRL_OFFSET, priv->hs_timing); + clk_enable(host->ciu_clk); + + host->bus_hz /= (priv->ciu_div + 1); + return 0; +} + +static void dw_mci_socfpga_prepare_command(struct dw_mci *host, u32 *cmdr) +{ + struct dw_mci_socfpga_priv_data *priv = host->priv; + + if (priv->hs_timing & DRV_CLK_PHASE_SHIFT_SEL_MASK) + *cmdr |= SDMMC_CMD_USE_HOLD_REG; +} + +static int dw_mci_socfpga_parse_dt(struct dw_mci *host) +{ + struct dw_mci_socfpga_priv_data *priv = host->priv; + struct device_node *np = host->dev->of_node; + u32 timing[2]; + u32 div = 0; + int ret; + + priv->sysreg = syscon_regmap_lookup_by_compatible("altr,sys-mgr"); + if (IS_ERR(priv->sysreg)) { + dev_err(host->dev, "regmap for altr,sys-mgr lookup failed.\n"); + return PTR_ERR(priv->sysreg); + } + + of_property_read_u32(np, "altr,dw-mshc-ciu-div", &div); + priv->ciu_div = div; + + ret = of_property_read_u32_array(np, + "altr,dw-mshc-sdr-timing", timing, 2); + if (ret) + return ret; + + priv->hs_timing = SYSMGR_SDMMC_CTRL_SET(timing[0], timing[1]); + return 0; +} + +static const struct dw_mci_drv_data socfpga_drv_data = { + .init = dw_mci_socfpga_priv_init, + .setup_clock = dw_mci_socfpga_setup_clock, + .prepare_command = dw_mci_socfpga_prepare_command, + .parse_dt = dw_mci_socfpga_parse_dt, +}; + +static const struct of_device_id dw_mci_socfpga_match[] = { + { .compatible = "altr,socfpga-dw-mshc", + .data = &socfpga_drv_data, }, + {}, +}; +MODULE_DEVICE_TABLE(of, dw_mci_socfpga_match); + +int dw_mci_socfpga_probe(struct platform_device *pdev) +{ + const struct dw_mci_drv_data *drv_data; + const struct of_device_id *match; + + match = of_match_node(dw_mci_socfpga_match, pdev->dev.of_node); + drv_data = match->data; + return dw_mci_pltfm_register(pdev, drv_data); +} + +static struct platform_driver dw_mci_socfpga_pltfm_driver = { + .probe = dw_mci_socfpga_probe, + .remove = __exit_p(dw_mci_pltfm_remove), + .driver = { + .name = "dwmmc_socfpga", + .of_match_table = of_match_ptr(dw_mci_socfpga_match), + .pm = &dw_mci_pltfm_pmops, + }, +}; + +module_platform_driver(dw_mci_socfpga_pltfm_driver); + +MODULE_DESCRIPTION("Altera SOCFPGA Specific DW-MSHC Driver Extension"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:dwmmc-socfpga"); diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h index 0b74189..3700cb2 100644 --- a/drivers/mmc/host/dw_mmc.h +++ b/drivers/mmc/host/dw_mmc.h @@ -111,6 +111,7 @@ #define SDMMC_INT_ERROR 0xbfc2 /* Command register defines */ #define SDMMC_CMD_START BIT(31) +#define SDMMC_CMD_USE_HOLD_REG BIT(29) #define SDMMC_CMD_CCS_EXP BIT(23) #define SDMMC_CMD_CEATA_RD BIT(22) #define SDMMC_CMD_UPD_CLK BIT(21)