Commit 03cd8f7e authored by Maxim Levitsky's avatar Maxim Levitsky Committed by Linus Torvalds
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ricoh_mmc: port from driver to pci quirk 



This patch solves nasty problem original driver has.

Original goal of the ricoh_mmc was to disable this device because then,
mmc cards can be read using standard SDHCI controller, thus avoiding
writing of yet another driver.

However, the act of disablement, makes other pci functions that belong to
this controller (xD and memstick) shift up one level, thus pci core has
now wrong idea about these devices.

To fix this issue, this patch moves the driver into the pci quirk section,
thus it is executes before the pci is enumerated, and therefore solving
that issue, also same sequence of commands is performed on resume for same
reasons.

Also regardless of the above, this way is cleaner.  You still need to set
CONFIG_MMC_RICOH_MMC to enable this quirk

Signed-off-by: default avatarMaxim Levitsky <maximlevitsky@gmail.com>
Acked-by: default avatarPhilip Langdale <philipl@overt.org>
Acked-by: default avatarWolfram Sang <w.sang@pengutronix.de>
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 45bf5cd7

drivers/mmc/host/Kconfig

+3 −7
Original line number Diff line number Diff line
@@ -69,20 +69,16 @@ config MMC_SDHCI_PCI 
	  If unsure, say N.



config MMC_RICOH_MMC

	tristate "Ricoh MMC Controller Disabler  (EXPERIMENTAL)"

	bool "Ricoh MMC Controller Disabler  (EXPERIMENTAL)"

	depends on MMC_SDHCI_PCI

	help

	  This selects the disabler for the Ricoh MMC Controller. This

	  This adds a pci quirk to disable Ricoh MMC Controller. This

	  proprietary controller is unnecessary because the SDHCI driver

	  supports MMC cards on the SD controller, but if it is not

	  disabled, it will steal the MMC cards away - rendering them

	  useless. It is safe to select this driver even if you don't

	  useless. It is safe to select this even if you don't

	  have a Ricoh based card reader.





	  To compile this driver as a module, choose M here:

	  the module will be called ricoh_mmc.



	  If unsure, say Y.



config MMC_SDHCI_OF

drivers/mmc/host/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -12,7 +12,6 @@ obj-$(CONFIG_MMC_IMX) += imxmmc.o 
obj-$(CONFIG_MMC_MXC)		+= mxcmmc.o

obj-$(CONFIG_MMC_SDHCI)		+= sdhci.o

obj-$(CONFIG_MMC_SDHCI_PCI)	+= sdhci-pci.o

obj-$(CONFIG_MMC_RICOH_MMC)	+= ricoh_mmc.o

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

obj-$(CONFIG_MMC_SDHCI_S3C)	+= sdhci-s3c.o

obj-$(CONFIG_MMC_WBSD)		+= wbsd.o

drivers/mmc/host/ricoh_mmc.c

deleted100644 → 0
+0 −262
Original line number Diff line number Diff line 
/*

 *  ricoh_mmc.c - Dummy driver to disable the Rioch MMC controller.

 *

 *  Copyright (C) 2007 Philip Langdale, All Rights Reserved.

 *

 * 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.

 */



/*

 * This is a conceptually ridiculous driver, but it is required by the way

 * the Ricoh multi-function chips (R5CXXX) work. These chips implement

 * the four main memory card controllers (SD, MMC, MS, xD) and one or both

 * of cardbus or firewire. It happens that they implement SD and MMC

 * support as separate controllers (and PCI functions). The linux SDHCI

 * driver supports MMC cards but the chip detects MMC cards in hardware

 * and directs them to the MMC controller - so the SDHCI driver never sees

 * them. To get around this, we must disable the useless MMC controller.

 * At that point, the SDHCI controller will start seeing them. As a bonus,

 * a detection event occurs immediately, even if the MMC card is already

 * in the reader.

 *

 * It seems to be the case that the relevant PCI registers to deactivate the

 * MMC controller live on PCI function 0, which might be the cardbus controller

 * or the firewire controller, depending on the particular chip in question. As

 * such, it makes what this driver has to do unavoidably ugly. Such is life.

 */



#include <linux/pci.h>



#define DRIVER_NAME "ricoh-mmc"



static const struct pci_device_id pci_ids[] __devinitdata = {

	{

		.vendor		= PCI_VENDOR_ID_RICOH,

		.device		= PCI_DEVICE_ID_RICOH_R5C843,

		.subvendor	= PCI_ANY_ID,

		.subdevice	= PCI_ANY_ID,

	},

	{ /* end: all zeroes */ },

};



MODULE_DEVICE_TABLE(pci, pci_ids);



static int ricoh_mmc_disable(struct pci_dev *fw_dev)

{

	u8 write_enable;

	u8 write_target;

	u8 disable;



	if (fw_dev->device == PCI_DEVICE_ID_RICOH_RL5C476) {

		/* via RL5C476 */



		pci_read_config_byte(fw_dev, 0xB7, &disable);

		if (disable & 0x02) {

			printk(KERN_INFO DRIVER_NAME

				": Controller already disabled. " \

				"Nothing to do.\n");

			return -ENODEV;

		}



		pci_read_config_byte(fw_dev, 0x8E, &write_enable);

		pci_write_config_byte(fw_dev, 0x8E, 0xAA);

		pci_read_config_byte(fw_dev, 0x8D, &write_target);

		pci_write_config_byte(fw_dev, 0x8D, 0xB7);

		pci_write_config_byte(fw_dev, 0xB7, disable | 0x02);

		pci_write_config_byte(fw_dev, 0x8E, write_enable);

		pci_write_config_byte(fw_dev, 0x8D, write_target);

	} else {

		/* via R5C832 */



		pci_read_config_byte(fw_dev, 0xCB, &disable);

		if (disable & 0x02) {

			printk(KERN_INFO DRIVER_NAME

			       ": Controller already disabled. " \

				"Nothing to do.\n");

			return -ENODEV;

		}



		pci_read_config_byte(fw_dev, 0xCA, &write_enable);

		pci_write_config_byte(fw_dev, 0xCA, 0x57);

		pci_write_config_byte(fw_dev, 0xCB, disable | 0x02);

		pci_write_config_byte(fw_dev, 0xCA, write_enable);

	}



	printk(KERN_INFO DRIVER_NAME

	       ": Controller is now disabled.\n");



	return 0;

}



static int ricoh_mmc_enable(struct pci_dev *fw_dev)

{

	u8 write_enable;

	u8 write_target;

	u8 disable;



	if (fw_dev->device == PCI_DEVICE_ID_RICOH_RL5C476) {

		/* via RL5C476 */



		pci_read_config_byte(fw_dev, 0x8E, &write_enable);

		pci_write_config_byte(fw_dev, 0x8E, 0xAA);

		pci_read_config_byte(fw_dev, 0x8D, &write_target);

		pci_write_config_byte(fw_dev, 0x8D, 0xB7);

		pci_read_config_byte(fw_dev, 0xB7, &disable);

		pci_write_config_byte(fw_dev, 0xB7, disable & ~0x02);

		pci_write_config_byte(fw_dev, 0x8E, write_enable);

		pci_write_config_byte(fw_dev, 0x8D, write_target);

	} else {

		/* via R5C832 */



		pci_read_config_byte(fw_dev, 0xCA, &write_enable);

		pci_read_config_byte(fw_dev, 0xCB, &disable);

		pci_write_config_byte(fw_dev, 0xCA, 0x57);

		pci_write_config_byte(fw_dev, 0xCB, disable & ~0x02);

		pci_write_config_byte(fw_dev, 0xCA, write_enable);

	}



	printk(KERN_INFO DRIVER_NAME

	       ": Controller is now re-enabled.\n");



	return 0;

}



static int __devinit ricoh_mmc_probe(struct pci_dev *pdev,

				     const struct pci_device_id *ent)

{

	u8 rev;

	u8 ctrlfound = 0;



	struct pci_dev *fw_dev = NULL;



	BUG_ON(pdev == NULL);

	BUG_ON(ent == NULL);



	pci_read_config_byte(pdev, PCI_CLASS_REVISION, &rev);



	printk(KERN_INFO DRIVER_NAME

		": Ricoh MMC controller found at %s [%04x:%04x] (rev %x)\n",

		pci_name(pdev), (int)pdev->vendor, (int)pdev->device,

		(int)rev);



	while ((fw_dev =

		pci_get_device(PCI_VENDOR_ID_RICOH,

			PCI_DEVICE_ID_RICOH_RL5C476, fw_dev))) {

		if (PCI_SLOT(pdev->devfn) == PCI_SLOT(fw_dev->devfn) &&

		    PCI_FUNC(fw_dev->devfn) == 0 &&

		    pdev->bus == fw_dev->bus) {

			if (ricoh_mmc_disable(fw_dev) != 0)

				return -ENODEV;



			pci_set_drvdata(pdev, fw_dev);



			++ctrlfound;

			break;

		}

	}



	fw_dev = NULL;



	while (!ctrlfound &&

	    (fw_dev = pci_get_device(PCI_VENDOR_ID_RICOH,

					PCI_DEVICE_ID_RICOH_R5C832, fw_dev))) {

		if (PCI_SLOT(pdev->devfn) == PCI_SLOT(fw_dev->devfn) &&

		    PCI_FUNC(fw_dev->devfn) == 0 &&

		    pdev->bus == fw_dev->bus) {

			if (ricoh_mmc_disable(fw_dev) != 0)

				return -ENODEV;



			pci_set_drvdata(pdev, fw_dev);



			++ctrlfound;

		}

	}



	if (!ctrlfound) {

		printk(KERN_WARNING DRIVER_NAME

		       ": Main Ricoh function not found. Cannot disable controller.\n");

		return -ENODEV;

	}



	return 0;

}



static void __devexit ricoh_mmc_remove(struct pci_dev *pdev)

{

	struct pci_dev *fw_dev = NULL;



	fw_dev = pci_get_drvdata(pdev);

	BUG_ON(fw_dev == NULL);



	ricoh_mmc_enable(fw_dev);



	pci_set_drvdata(pdev, NULL);

}



static int ricoh_mmc_suspend_late(struct pci_dev *pdev, pm_message_t state)

{

	struct pci_dev *fw_dev = NULL;



	fw_dev = pci_get_drvdata(pdev);

	BUG_ON(fw_dev == NULL);



	printk(KERN_INFO DRIVER_NAME ": Suspending.\n");



	ricoh_mmc_enable(fw_dev);



	return 0;

}



static int ricoh_mmc_resume_early(struct pci_dev *pdev)

{

	struct pci_dev *fw_dev = NULL;



	fw_dev = pci_get_drvdata(pdev);

	BUG_ON(fw_dev == NULL);



	printk(KERN_INFO DRIVER_NAME ": Resuming.\n");



	ricoh_mmc_disable(fw_dev);



	return 0;

}



static struct pci_driver ricoh_mmc_driver = {

	.name = 	DRIVER_NAME,

	.id_table =	pci_ids,

	.probe = 	ricoh_mmc_probe,

	.remove =	__devexit_p(ricoh_mmc_remove),

	.suspend_late =	ricoh_mmc_suspend_late,

	.resume_early =	ricoh_mmc_resume_early,

};



/*****************************************************************************\

 *                                                                           *

 * Driver init/exit                                                          *

 *                                                                           *

\*****************************************************************************/



static int __init ricoh_mmc_drv_init(void)

{

	printk(KERN_INFO DRIVER_NAME

		": Ricoh MMC Controller disabling driver\n");

	printk(KERN_INFO DRIVER_NAME ": Copyright(c) Philip Langdale\n");



	return pci_register_driver(&ricoh_mmc_driver);

}



static void __exit ricoh_mmc_drv_exit(void)

{

	pci_unregister_driver(&ricoh_mmc_driver);

}



module_init(ricoh_mmc_drv_init);

module_exit(ricoh_mmc_drv_exit);



MODULE_AUTHOR("Philip Langdale <philipl@alumni.utexas.net>");

MODULE_DESCRIPTION("Ricoh MMC Controller disabling driver");

MODULE_LICENSE("GPL");

drivers/pci/quirks.c

+85 −0
Original line number Diff line number Diff line
@@ -2533,6 +2533,91 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x1518, quirk_i82576_sriov); 


#endif	/* CONFIG_PCI_IOV */



/*

 * This is a quirk for the Ricoh MMC controller found as a part of

 * some mulifunction chips.



 * This is very similiar and based on the ricoh_mmc driver written by

 * Philip Langdale. Thank you for these magic sequences.

 *

 * These chips implement the four main memory card controllers (SD, MMC, MS, xD)

 * and one or both of cardbus or firewire.

 *

 * It happens that they implement SD and MMC

 * support as separate controllers (and PCI functions). The linux SDHCI

 * driver supports MMC cards but the chip detects MMC cards in hardware

 * and directs them to the MMC controller - so the SDHCI driver never sees

 * them.

 *

 * To get around this, we must disable the useless MMC controller.

 * At that point, the SDHCI controller will start seeing them

 * It seems to be the case that the relevant PCI registers to deactivate the

 * MMC controller live on PCI function 0, which might be the cardbus controller

 * or the firewire controller, depending on the particular chip in question

 *

 * This has to be done early, because as soon as we disable the MMC controller

 * other pci functions shift up one level, e.g. function #2 becomes function

 * #1, and this will confuse the pci core.

 */



#ifdef CONFIG_MMC_RICOH_MMC

static void ricoh_mmc_fixup_rl5c476(struct pci_dev *dev)

{

	/* disable via cardbus interface */

	u8 write_enable;

	u8 write_target;

	u8 disable;



	/* disable must be done via function #0 */

	if (PCI_FUNC(dev->devfn))

		return;



	pci_read_config_byte(dev, 0xB7, &disable);

	if (disable & 0x02)

		return;



	pci_read_config_byte(dev, 0x8E, &write_enable);

	pci_write_config_byte(dev, 0x8E, 0xAA);

	pci_read_config_byte(dev, 0x8D, &write_target);

	pci_write_config_byte(dev, 0x8D, 0xB7);

	pci_write_config_byte(dev, 0xB7, disable | 0x02);

	pci_write_config_byte(dev, 0x8E, write_enable);

	pci_write_config_byte(dev, 0x8D, write_target);



	dev_notice(&dev->dev, "proprietary Ricoh MMC controller disabled (via cardbus function)\n");

	dev_notice(&dev->dev, "MMC cards are now supported by standard SDHCI controller\n");

}

DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_RICOH, PCI_DEVICE_ID_RICOH_RL5C476, ricoh_mmc_fixup_rl5c476);

DECLARE_PCI_FIXUP_RESUME_EARLY(PCI_VENDOR_ID_RICOH, PCI_DEVICE_ID_RICOH_RL5C476, ricoh_mmc_fixup_rl5c476);



static void ricoh_mmc_fixup_r5c832(struct pci_dev *dev)

{

	/* disable via firewire interface */

	u8 write_enable;

	u8 disable;



	/* disable must be done via function #0 */

	if (PCI_FUNC(dev->devfn))

		return;



	pci_read_config_byte(dev, 0xCB, &disable);



	if (disable & 0x02)

		return;



	pci_read_config_byte(dev, 0xCA, &write_enable);

	pci_write_config_byte(dev, 0xCA, 0x57);

	pci_write_config_byte(dev, 0xCB, disable | 0x02);

	pci_write_config_byte(dev, 0xCA, write_enable);



	dev_notice(&dev->dev, "proprietary Ricoh MMC controller disabled (via firewire function)\n");

	dev_notice(&dev->dev, "MMC cards are now supported by standard SDHCI controller\n");

}

DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_RICOH, PCI_DEVICE_ID_RICOH_R5C832, ricoh_mmc_fixup_r5c832);

DECLARE_PCI_FIXUP_RESUME_EARLY(PCI_VENDOR_ID_RICOH, PCI_DEVICE_ID_RICOH_R5C832, ricoh_mmc_fixup_r5c832);

#endif /*CONFIG_MMC_RICOH_MMC*/





static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f,

			  struct pci_fixup *end)

{

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