Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 20b1597b authored by Anton Vorontsov's avatar Anton Vorontsov Committed by Linus Torvalds
Browse files

sdhci-pltfm: add support for CNS3xxx SoC devices 



There's nothing special, just SoC-specific ops and quirks.

Signed-off-by: default avatarAnton Vorontsov <avorontsov@mvista.com>
Cc: Ben Dooks <ben@simtec.co.uk>
Cc: Richard R?jfors <richard.rojfors@pelagicore.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 845e3f4f

drivers/mmc/host/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -121,6 +121,15 @@ config MMC_SDHCI_PLTFM 


	  If unsure, say N.



config MMC_SDHCI_CNS3XXX

	bool "SDHCI support on the Cavium Networks CNS3xxx SoC"

	depends on ARCH_CNS3XXX

	depends on MMC_SDHCI_PLTFM

	help

	  This selects the SDHCI support for CNS3xxx System-on-Chip devices.



	  If unsure, say N.



config MMC_SDHCI_S3C

	tristate "SDHCI support on Samsung S3C SoC"

	depends on MMC_SDHCI && (PLAT_S3C24XX || PLAT_S3C64XX)

drivers/mmc/host/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o 


obj-$(CONFIG_MMC_SDHCI_PLTFM)			+= sdhci-platform.o

sdhci-platform-y				:= sdhci-pltfm.o

sdhci-platform-$(CONFIG_MMC_SDHCI_CNS3XXX)	+= sdhci-cns3xxx.o



obj-$(CONFIG_MMC_SDHCI_OF)	+= sdhci-of.o

sdhci-of-y				:= sdhci-of-core.o

drivers/mmc/host/sdhci-cns3xxx.c

0 → 100644
+97 −0
Original line number Diff line number Diff line 
/*

 * SDHCI support for CNS3xxx SoC

 *

 * Copyright 2008 Cavium Networks

 * Copyright 2010 MontaVista Software, LLC.

 *

 * Authors: Scott Shu

 *	    Anton Vorontsov <avorontsov@mvista.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#include <linux/delay.h>

#include <linux/device.h>

#include <linux/mmc/host.h>

#include <linux/sdhci-pltfm.h>

#include <mach/cns3xxx.h>

#include "sdhci.h"

#include "sdhci-pltfm.h"



static unsigned int sdhci_cns3xxx_get_max_clk(struct sdhci_host *host)

{

	return 150000000;

}



static void sdhci_cns3xxx_set_clock(struct sdhci_host *host, unsigned int clock)

{

	struct device *dev = mmc_dev(host->mmc);

	int div = 1;

	u16 clk;

	unsigned long timeout;



	if (clock == host->clock)

		return;



	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);



	if (clock == 0)

		goto out;



	while (host->max_clk / div > clock) {

		/*

		 * On CNS3xxx divider grows linearly up to 4, and then

		 * exponentially up to 256.

		 */

		if (div < 4)

			div += 1;

		else if (div < 256)

			div *= 2;

		else

			break;

	}



	dev_dbg(dev, "desired SD clock: %d, actual: %d\n",

		clock, host->max_clk / div);



	/* Divide by 3 is special. */

	if (div != 3)

		div >>= 1;



	clk = div << SDHCI_DIVIDER_SHIFT;

	clk |= SDHCI_CLOCK_INT_EN;

	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);



	timeout = 20;

	while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))

			& SDHCI_CLOCK_INT_STABLE)) {

		if (timeout == 0) {

			dev_warn(dev, "clock is unstable");

			break;

		}

		timeout--;

		mdelay(1);

	}



	clk |= SDHCI_CLOCK_CARD_EN;

	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);

out:

	host->clock = clock;

}



static struct sdhci_ops sdhci_cns3xxx_ops = {

	.get_max_clock	= sdhci_cns3xxx_get_max_clk,

	.set_clock	= sdhci_cns3xxx_set_clock,

};



struct sdhci_pltfm_data sdhci_cns3xxx_pdata = {

	.ops = &sdhci_cns3xxx_ops,

	.quirks = SDHCI_QUIRK_BROKEN_DMA |

		  SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |

		  SDHCI_QUIRK_INVERTED_WRITE_PROTECT |

		  SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |

		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |

		  SDHCI_QUIRK_NONSTANDARD_CLOCK,

};

drivers/mmc/host/sdhci-pltfm.c

+3 −0
Original line number Diff line number Diff line
@@ -158,6 +158,9 @@ static int __devexit sdhci_pltfm_remove(struct platform_device *pdev) 


static const struct platform_device_id sdhci_pltfm_ids[] = {

	{ "sdhci", },

#ifdef CONFIG_MMC_SDHCI_CNS3XXX

	{ "sdhci-cns3xxx", (kernel_ulong_t)&sdhci_cns3xxx_pdata },

#endif

	{ },

};

MODULE_DEVICE_TABLE(platform, sdhci_pltfm_ids);

drivers/mmc/host/sdhci-pltfm.h

+4 −0
Original line number Diff line number Diff line
@@ -11,4 +11,8 @@ 
#ifndef _DRIVERS_MMC_SDHCI_PLTFM_H

#define _DRIVERS_MMC_SDHCI_PLTFM_H



#include <linux/sdhci-pltfm.h>



extern struct sdhci_pltfm_data sdhci_cns3xxx_pdata;



#endif /* _DRIVERS_MMC_SDHCI_PLTFM_H */