Commit 46b723dd authored by Ludovic Barre's avatar Ludovic Barre Committed by Ulf Hansson
Browse files

mmc: mmci: add stm32 sdmmc variant 



This patch adds a stm32 sdmmc variant, rev 1.1.
Introduces a new Manufacturer id "0x53, ascii 'S' to define
new stm32 sdmmc family with clean range of amba
revision/configurations bits (corresponding to sdmmc_ver
register with major/minor fields).
Add 2 variants properties:
-dma_lli, to enable link list support.
-stm32_idmabsize_mask, defines the range of SDMMC_IDMABSIZER register
 which specify the number bytes per buffer.

DT properties for sdmmc:
-Indicate signal directions (only one property
 for d0dir, d123dir, cmd_dir)
-Select command and data phase relation.
-Select "clock in" from an external driver.

Signed-off-by: default avatarLudovic Barre <ludovic.barre@st.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 62022894

drivers/mmc/host/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -34,6 +34,16 @@ config MMC_QCOM_DML 


	  if unsure, say N.



config MMC_STM32_SDMMC

	bool "STMicroelectronics STM32 SDMMC Controller"

	depends on MMC_ARMMMCI

	default y

	help

	  This selects the STMicroelectronics STM32 SDMMC host controller.

	  If you have a STM32 sdmmc host with internal DMA say Y here.



	  If unsure, say N.



config MMC_PXA

	tristate "Intel PXA25x/26x/27x Multimedia Card Interface support"

	depends on ARCH_PXA

drivers/mmc/host/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
obj-$(CONFIG_MMC_ARMMMCI) += armmmci.o

armmmci-y := mmci.o

armmmci-$(CONFIG_MMC_QCOM_DML) += mmci_qcom_dml.o

armmmci-$(CONFIG_MMC_STM32_SDMMC) += mmci_stm32_sdmmc.o

obj-$(CONFIG_MMC_PXA)		+= pxamci.o

obj-$(CONFIG_MMC_MXC)		+= mxcmmc.o

obj-$(CONFIG_MMC_MXS)		+= mxs-mmc.o

drivers/mmc/host/mmci.c

+36 −0
Original line number Diff line number Diff line
@@ -52,6 +52,12 @@ void mmci_variant_init(struct mmci_host *host); 
static inline void mmci_variant_init(struct mmci_host *host) {}

#endif



#ifdef CONFIG_MMC_STM32_SDMMC

void sdmmc_variant_init(struct mmci_host *host);

#else

static inline void sdmmc_variant_init(struct mmci_host *host) {}

#endif



static unsigned int fmax = 515633;



static struct variant_data variant_arm = {
@@ -259,6 +265,25 @@ static struct variant_data variant_stm32 = { 
	.init			= mmci_variant_init,

};



static struct variant_data variant_stm32_sdmmc = {

	.fifosize		= 16 * 4,

	.fifohalfsize		= 8 * 4,

	.f_max			= 208000000,

	.stm32_clkdiv		= true,

	.cmdreg_cpsm_enable	= MCI_CPSM_STM32_ENABLE,

	.cmdreg_lrsp_crc	= MCI_CPSM_STM32_LRSP_CRC,

	.cmdreg_srsp_crc	= MCI_CPSM_STM32_SRSP_CRC,

	.cmdreg_srsp		= MCI_CPSM_STM32_SRSP,

	.data_cmd_enable	= MCI_CPSM_STM32_CMDTRANS,

	.irq_pio_mask		= MCI_IRQ_PIO_STM32_MASK,

	.datactrl_first		= true,

	.datacnt_useless	= true,

	.datalength_bits	= 25,

	.datactrl_blocksz	= 14,

	.stm32_idmabsize_mask	= GENMASK(12, 5),

	.init			= sdmmc_variant_init,

};



static struct variant_data variant_qcom = {

	.fifosize		= 16 * 4,

	.fifohalfsize		= 8 * 4,
@@ -1736,6 +1761,12 @@ static int mmci_of_parse(struct device_node *np, struct mmc_host *mmc) 
		host->pwr_reg_add |= MCI_ST_CMDDIREN;

	if (of_get_property(np, "st,sig-pin-fbclk", NULL))

		host->pwr_reg_add |= MCI_ST_FBCLKEN;

	if (of_get_property(np, "st,sig-dir", NULL))

		host->pwr_reg_add |= MCI_STM32_DIRPOL;

	if (of_get_property(np, "st,neg-edge", NULL))

		host->clk_reg_add |= MCI_STM32_CLK_NEGEDGE;

	if (of_get_property(np, "st,use-ckin", NULL))

		host->clk_reg_add |= MCI_STM32_CLK_SELCKIN;



	if (of_get_property(np, "mmc-cap-mmc-highspeed", NULL))

		mmc->caps |= MMC_CAP_MMC_HIGHSPEED;
@@ -2177,6 +2208,11 @@ static const struct amba_id mmci_ids[] = { 
		.mask   = 0x00ffffff,

		.data	= &variant_stm32,

	},

	{

		.id     = 0x10153180,

		.mask	= 0xf0ffffff,

		.data	= &variant_stm32_sdmmc,

	},

	/* Qualcomm variants */

	{

		.id     = 0x00051180,

drivers/mmc/host/mmci.h

+5 −0
Original line number Diff line number Diff line
@@ -304,6 +304,8 @@ struct mmci_host; 
 * @start_err: bitmask identifying the STARTBITERR bit inside MMCISTATUS

 *	       register.

 * @opendrain: bitmask identifying the OPENDRAIN bit inside MMCIPOWER register

 * @dma_lli: true if variant has dma link list feature.

 * @stm32_idmabsize_mask: stm32 sdmmc idma buffer size.

 */

struct variant_data {

	unsigned int		clkreg;
@@ -346,6 +348,8 @@ struct variant_data { 
	unsigned int		irq_pio_mask;

	u32			start_err;

	u32			opendrain;

	u8			dma_lli:1;

	u32			stm32_idmabsize_mask;

	void (*init)(struct mmci_host *host);

};
@@ -387,6 +391,7 @@ struct mmci_host { 
	u32			pwr_reg;

	u32			pwr_reg_add;

	u32			clk_reg;

	u32			clk_reg_add;

	u32			datactrl_reg;

	u32			busy_status;

	u32			mask1_reg;

drivers/mmc/host/mmci_stm32_sdmmc.c

0 → 100644
+282 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (C) STMicroelectronics 2018 - All Rights Reserved

 * Author: Ludovic.barre@st.com for STMicroelectronics.

 */

#include <linux/delay.h>

#include <linux/dma-mapping.h>

#include <linux/mmc/host.h>

#include <linux/mmc/card.h>

#include <linux/reset.h>

#include <linux/scatterlist.h>

#include "mmci.h"



#define SDMMC_LLI_BUF_LEN	PAGE_SIZE

#define SDMMC_IDMA_BURST	BIT(MMCI_STM32_IDMABNDT_SHIFT)



struct sdmmc_lli_desc {

	u32 idmalar;

	u32 idmabase;

	u32 idmasize;

};



struct sdmmc_priv {

	dma_addr_t sg_dma;

	void *sg_cpu;

};



int sdmmc_idma_validate_data(struct mmci_host *host,

			     struct mmc_data *data)

{

	struct scatterlist *sg;

	int i;



	/*

	 * idma has constraints on idmabase & idmasize for each element

	 * excepted the last element which has no constraint on idmasize

	 */

	for_each_sg(data->sg, sg, data->sg_len - 1, i) {

		if (!IS_ALIGNED(sg_dma_address(data->sg), sizeof(u32)) ||

		    !IS_ALIGNED(sg_dma_len(data->sg), SDMMC_IDMA_BURST)) {

			dev_err(mmc_dev(host->mmc),

				"unaligned scatterlist: ofst:%x length:%d\n",

				data->sg->offset, data->sg->length);

			return -EINVAL;

		}

	}



	if (!IS_ALIGNED(sg_dma_address(data->sg), sizeof(u32))) {

		dev_err(mmc_dev(host->mmc),

			"unaligned last scatterlist: ofst:%x length:%d\n",

			data->sg->offset, data->sg->length);

		return -EINVAL;

	}



	return 0;

}



static int _sdmmc_idma_prep_data(struct mmci_host *host,

				 struct mmc_data *data)

{

	int n_elem;



	n_elem = dma_map_sg(mmc_dev(host->mmc),

			    data->sg,

			    data->sg_len,

			    mmc_get_dma_dir(data));



	if (!n_elem) {

		dev_err(mmc_dev(host->mmc), "dma_map_sg failed\n");

		return -EINVAL;

	}



	return 0;

}



static int sdmmc_idma_prep_data(struct mmci_host *host,

				struct mmc_data *data, bool next)

{

	/* Check if job is already prepared. */

	if (!next && data->host_cookie == host->next_cookie)

		return 0;



	return _sdmmc_idma_prep_data(host, data);

}



static void sdmmc_idma_unprep_data(struct mmci_host *host,

				   struct mmc_data *data, int err)

{

	dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,

		     mmc_get_dma_dir(data));

}



static int sdmmc_idma_setup(struct mmci_host *host)

{

	struct sdmmc_priv *idma;



	idma = devm_kzalloc(mmc_dev(host->mmc), sizeof(*idma), GFP_KERNEL);

	if (!idma)

		return -ENOMEM;



	host->dma_priv = idma;



	if (host->variant->dma_lli) {

		idma->sg_cpu = dmam_alloc_coherent(mmc_dev(host->mmc),

						   SDMMC_LLI_BUF_LEN,

						   &idma->sg_dma, GFP_KERNEL);

		if (!idma->sg_cpu) {

			dev_err(mmc_dev(host->mmc),

				"Failed to alloc IDMA descriptor\n");

			return -ENOMEM;

		}

		host->mmc->max_segs = SDMMC_LLI_BUF_LEN /

			sizeof(struct sdmmc_lli_desc);

		host->mmc->max_seg_size = host->variant->stm32_idmabsize_mask;

	} else {

		host->mmc->max_segs = 1;

		host->mmc->max_seg_size = host->mmc->max_req_size;

	}



	return 0;

}



static int sdmmc_idma_start(struct mmci_host *host, unsigned int *datactrl)



{

	struct sdmmc_priv *idma = host->dma_priv;

	struct sdmmc_lli_desc *desc = (struct sdmmc_lli_desc *)idma->sg_cpu;

	struct mmc_data *data = host->data;

	struct scatterlist *sg;

	int i;



	if (!host->variant->dma_lli || data->sg_len == 1) {

		writel_relaxed(sg_dma_address(data->sg),

			       host->base + MMCI_STM32_IDMABASE0R);

		writel_relaxed(MMCI_STM32_IDMAEN,

			       host->base + MMCI_STM32_IDMACTRLR);

		return 0;

	}



	for_each_sg(data->sg, sg, data->sg_len, i) {

		desc[i].idmalar = (i + 1) * sizeof(struct sdmmc_lli_desc);

		desc[i].idmalar |= MMCI_STM32_ULA | MMCI_STM32_ULS

			| MMCI_STM32_ABR;

		desc[i].idmabase = sg_dma_address(sg);

		desc[i].idmasize = sg_dma_len(sg);

	}



	/* notice the end of link list */

	desc[data->sg_len - 1].idmalar &= ~MMCI_STM32_ULA;



	dma_wmb();

	writel_relaxed(idma->sg_dma, host->base + MMCI_STM32_IDMABAR);

	writel_relaxed(desc[0].idmalar, host->base + MMCI_STM32_IDMALAR);

	writel_relaxed(desc[0].idmabase, host->base + MMCI_STM32_IDMABASE0R);

	writel_relaxed(desc[0].idmasize, host->base + MMCI_STM32_IDMABSIZER);

	writel_relaxed(MMCI_STM32_IDMAEN | MMCI_STM32_IDMALLIEN,

		       host->base + MMCI_STM32_IDMACTRLR);



	return 0;

}



static void sdmmc_idma_finalize(struct mmci_host *host, struct mmc_data *data)

{

	writel_relaxed(0, host->base + MMCI_STM32_IDMACTRLR);

}



static void mmci_sdmmc_set_clkreg(struct mmci_host *host, unsigned int desired)

{

	unsigned int clk = 0, ddr = 0;



	if (host->mmc->ios.timing == MMC_TIMING_MMC_DDR52 ||

	    host->mmc->ios.timing == MMC_TIMING_UHS_DDR50)

		ddr = MCI_STM32_CLK_DDR;



	/*

	 * cclk = mclk / (2 * clkdiv)

	 * clkdiv 0 => bypass

	 * in ddr mode bypass is not possible

	 */

	if (desired) {

		if (desired >= host->mclk && !ddr) {

			host->cclk = host->mclk;

		} else {

			clk = DIV_ROUND_UP(host->mclk, 2 * desired);

			if (clk > MCI_STM32_CLK_CLKDIV_MSK)

				clk = MCI_STM32_CLK_CLKDIV_MSK;

			host->cclk = host->mclk / (2 * clk);

		}

	} else {

		/*

		 * while power-on phase the clock can't be define to 0,

		 * Only power-off and power-cyc deactivate the clock.

		 * if desired clock is 0, set max divider

		 */

		clk = MCI_STM32_CLK_CLKDIV_MSK;

		host->cclk = host->mclk / (2 * clk);

	}



	/* Set actual clock for debug */

	if (host->mmc->ios.power_mode == MMC_POWER_ON)

		host->mmc->actual_clock = host->cclk;

	else

		host->mmc->actual_clock = 0;



	if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4)

		clk |= MCI_STM32_CLK_WIDEBUS_4;

	if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8)

		clk |= MCI_STM32_CLK_WIDEBUS_8;



	clk |= MCI_STM32_CLK_HWFCEN;

	clk |= host->clk_reg_add;

	clk |= ddr;



	/*

	 * SDMMC_FBCK is selected when an external Delay Block is needed

	 * with SDR104.

	 */

	if (host->mmc->ios.timing >= MMC_TIMING_UHS_SDR50) {

		clk |= MCI_STM32_CLK_BUSSPEED;

		if (host->mmc->ios.timing == MMC_TIMING_UHS_SDR104) {

			clk &= ~MCI_STM32_CLK_SEL_MSK;

			clk |= MCI_STM32_CLK_SELFBCK;

		}

	}



	mmci_write_clkreg(host, clk);

}



static void mmci_sdmmc_set_pwrreg(struct mmci_host *host, unsigned int pwr)

{

	struct mmc_ios ios = host->mmc->ios;



	pwr = host->pwr_reg_add;



	if (ios.power_mode == MMC_POWER_OFF) {

		/* Only a reset could power-off sdmmc */

		reset_control_assert(host->rst);

		udelay(2);

		reset_control_deassert(host->rst);



		/*

		 * Set the SDMMC in Power-cycle state.

		 * This will make that the SDMMC_D[7:0], SDMMC_CMD and SDMMC_CK

		 * are driven low, to prevent the Card from being supplied

		 * through the signal lines.

		 */

		mmci_write_pwrreg(host, MCI_STM32_PWR_CYC | pwr);

	} else if (ios.power_mode == MMC_POWER_ON) {

		/*

		 * After power-off (reset): the irq mask defined in probe

		 * functionis lost

		 * ault irq mask (probe) must be activated

		 */

		writel(MCI_IRQENABLE | host->variant->start_err,

		       host->base + MMCIMASK0);



		/*

		 * After a power-cycle state, we must set the SDMMC in

		 * Power-off. The SDMMC_D[7:0], SDMMC_CMD and SDMMC_CK are

		 * driven high. Then we can set the SDMMC to Power-on state

		 */

		mmci_write_pwrreg(host, MCI_PWR_OFF | pwr);

		mdelay(1);

		mmci_write_pwrreg(host, MCI_PWR_ON | pwr);

	}

}



static struct mmci_host_ops sdmmc_variant_ops = {

	.validate_data = sdmmc_idma_validate_data,

	.prep_data = sdmmc_idma_prep_data,

	.unprep_data = sdmmc_idma_unprep_data,

	.dma_setup = sdmmc_idma_setup,

	.dma_start = sdmmc_idma_start,

	.dma_finalize = sdmmc_idma_finalize,

	.set_clkreg = mmci_sdmmc_set_clkreg,

	.set_pwrreg = mmci_sdmmc_set_pwrreg,

};



void sdmmc_variant_init(struct mmci_host *host)

{

	host->ops = &sdmmc_variant_ops;

}

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