Commit b650352d authored by Chris Ball's avatar Chris Ball
Browse files

mmc: sdhci-pxa: Add device tree support 



Tested on an OLPC XO-1.75.  (MMP2, sdhci-pxav3, CONFIG_MACH_MMP2_DT=y)

Signed-off-by: default avatarChris Ball <cjb@laptop.org>
Acked-by: default avatarHaojian Zhuang <haojian.zhuang@gmail.com>
parent ed3efc1c

Documentation/devicetree/bindings/mmc/sdhci-pxa.txt

0 → 100644
+21 −0
Original line number Diff line number Diff line 
* Marvell sdhci-pxa v2/v3 controller



This file documents differences between the core properties in mmc.txt

and the properties used by the sdhci-pxav2 and sdhci-pxav3 drivers.



Required properties:

- compatible: Should be "mrvl,pxav2-mmc" or "mrvl,pxav3-mmc".



Optional properties:

- mrvl,clk-delay-cycles: Specify a number of cycles to delay for tuning.



Example:



sdhci@d4280800 {

	compatible = "mrvl,pxav3-mmc";

	reg = <0xd4280800 0x800>;

	bus-width = <8>;

	interrupts = <27>;

	non-removable;

	mrvl,clk-delay-cycles = <31>;

};

drivers/mmc/host/sdhci-pxav2.c

+54 −0
Original line number Diff line number Diff line
@@ -28,6 +28,9 @@ 
#include <linux/mmc/host.h>

#include <linux/platform_data/pxa_sdhci.h>

#include <linux/slab.h>

#include <linux/of.h>

#include <linux/of_device.h>



#include "sdhci.h"

#include "sdhci-pltfm.h"
@@ -121,6 +124,48 @@ static struct sdhci_ops pxav2_sdhci_ops = { 
	.platform_8bit_width = pxav2_mmc_set_width,

};



#ifdef CONFIG_OF

static const struct of_device_id sdhci_pxav2_of_match[] = {

	{

		.compatible = "mrvl,pxav2-mmc",

	},

	{},

};

MODULE_DEVICE_TABLE(of, sdhci_pxav2_of_match);



static struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)

{

	struct sdhci_pxa_platdata *pdata;

	struct device_node *np = dev->of_node;

	u32 bus_width;

	u32 clk_delay_cycles;



	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);

	if (!pdata)

		return NULL;



	if (of_find_property(np, "non-removable", NULL))

		pdata->flags |= PXA_FLAG_CARD_PERMANENT;



	of_property_read_u32(np, "bus-width", &bus_width);

	if (bus_width == 8)

		pdata->flags |= PXA_FLAG_SD_8_BIT_CAPABLE_SLOT;



	of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles);

	if (clk_delay_cycles > 0) {

		pdata->clk_delay_sel = 1;

		pdata->clk_delay_cycles = clk_delay_cycles;

	}



	return pdata;

}

#else

static inline struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)

{

	return NULL;

}

#endif



static int __devinit sdhci_pxav2_probe(struct platform_device *pdev)

{

	struct sdhci_pltfm_host *pltfm_host;
@@ -128,6 +173,8 @@ static int __devinit sdhci_pxav2_probe(struct platform_device *pdev) 
	struct device *dev = &pdev->dev;

	struct sdhci_host *host = NULL;

	struct sdhci_pxa *pxa = NULL;

	const struct of_device_id *match;



	int ret;

	struct clk *clk;
@@ -156,6 +203,10 @@ static int __devinit sdhci_pxav2_probe(struct platform_device *pdev) 
		| SDHCI_QUIRK_BROKEN_TIMEOUT_VAL

		| SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN;



	match = of_match_device(of_match_ptr(sdhci_pxav2_of_match), &pdev->dev);

	if (match) {

		pdata = pxav2_get_mmc_pdata(dev);

	}

	if (pdata) {

		if (pdata->flags & PXA_FLAG_CARD_PERMANENT) {

			/* on-chip device */
@@ -218,6 +269,9 @@ static struct platform_driver sdhci_pxav2_driver = { 
	.driver		= {

		.name	= "sdhci-pxav2",

		.owner	= THIS_MODULE,

#ifdef CONFIG_OF

		.of_match_table = sdhci_pxav2_of_match,

#endif

		.pm	= SDHCI_PLTFM_PMOPS,

	},

	.probe		= sdhci_pxav2_probe,

drivers/mmc/host/sdhci-pxav3.c

+52 −0
Original line number Diff line number Diff line
@@ -28,6 +28,9 @@ 
#include <linux/slab.h>

#include <linux/delay.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_device.h>



#include "sdhci.h"

#include "sdhci-pltfm.h"
@@ -164,6 +167,46 @@ static struct sdhci_ops pxav3_sdhci_ops = { 
	.platform_send_init_74_clocks = pxav3_gen_init_74_clocks,

};



#ifdef CONFIG_OF

static const struct of_device_id sdhci_pxav3_of_match[] = {

	{

		.compatible = "mrvl,pxav3-mmc",

	},

	{},

};

MODULE_DEVICE_TABLE(of, sdhci_pxav3_of_match);



static struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev)

{

	struct sdhci_pxa_platdata *pdata;

	struct device_node *np = dev->of_node;

	u32 bus_width;

	u32 clk_delay_cycles;



	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);

	if (!pdata)

		return NULL;



	if (of_find_property(np, "non-removable", NULL))

		pdata->flags |= PXA_FLAG_CARD_PERMANENT;



	of_property_read_u32(np, "bus-width", &bus_width);

	if (bus_width == 8)

		pdata->flags |= PXA_FLAG_SD_8_BIT_CAPABLE_SLOT;



	of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles);

	if (clk_delay_cycles > 0)

		pdata->clk_delay_cycles = clk_delay_cycles;



	return pdata;

}

#else

static inline struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev)

{

	return NULL;

}

#endif



static int __devinit sdhci_pxav3_probe(struct platform_device *pdev)

{

	struct sdhci_pltfm_host *pltfm_host;
@@ -171,6 +214,8 @@ static int __devinit sdhci_pxav3_probe(struct platform_device *pdev) 
	struct device *dev = &pdev->dev;

	struct sdhci_host *host = NULL;

	struct sdhci_pxa *pxa = NULL;

	const struct of_device_id *match;



	int ret;

	struct clk *clk;
@@ -202,6 +247,10 @@ static int __devinit sdhci_pxav3_probe(struct platform_device *pdev) 
	/* enable 1/8V DDR capable */

	host->mmc->caps |= MMC_CAP_1_8V_DDR;



	match = of_match_device(of_match_ptr(sdhci_pxav3_of_match), &pdev->dev);

	if (match)

		pdata = pxav3_get_mmc_pdata(dev);



	if (pdata) {

		if (pdata->flags & PXA_FLAG_CARD_PERMANENT) {

			/* on-chip device */
@@ -263,6 +312,9 @@ static int __devexit sdhci_pxav3_remove(struct platform_device *pdev) 
static struct platform_driver sdhci_pxav3_driver = {

	.driver		= {

		.name	= "sdhci-pxav3",

#ifdef CONFIG_OF

		.of_match_table = sdhci_pxav3_of_match,

#endif

		.owner	= THIS_MODULE,

		.pm	= SDHCI_PLTFM_PMOPS,

	},