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Date: Wed, 13 Jan 2010 07:46:57 +0100
From: Wolfram Sang <w.sang@...gutronix.de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Philip Langdale <philipl@...rt.org>,
Maxim Levitsky <maximlevitsky@...il.com>,
Pierre Ossman <pierre@...man.eu>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-mmc@...r.kernel.org
Subject: Re: [PATCH v2] port ricoh_mmc to be pci quirk
On Tue, Jan 12, 2010 at 03:43:50PM -0800, Andrew Morton wrote:
> I have a note here that Pierre had issues with the patch. I'm
> uncertain whether those are now resolved?
Looks good in general, minor things I noticed:
> From: Maxim Levitsky <maximlevitsky@...il.com>
>
> 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: Maxim Levitsky <maximlevitsky@...il.com>
> Cc: Philip Langdale <philipl@...rt.org>
> Cc: <linux-mmc@...r.kernel.org>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
>
> drivers/mmc/host/Kconfig | 10 -
> drivers/mmc/host/Makefile | 1
> drivers/mmc/host/ricoh_mmc.c | 262 ---------------------------------
> drivers/pci/quirks.c | 92 +++++++++++
> 4 files changed, 95 insertions(+), 270 deletions(-)
>
> diff -puN drivers/mmc/host/Kconfig~ricoh_mmc-port-from-driver-to-pci-quirk drivers/mmc/host/Kconfig
> --- a/drivers/mmc/host/Kconfig~ricoh_mmc-port-from-driver-to-pci-quirk
> +++ a/drivers/mmc/host/Kconfig
> @@ -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
> diff -puN drivers/mmc/host/Makefile~ricoh_mmc-port-from-driver-to-pci-quirk drivers/mmc/host/Makefile
> --- a/drivers/mmc/host/Makefile~ricoh_mmc-port-from-driver-to-pci-quirk
> +++ a/drivers/mmc/host/Makefile
> @@ -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
> diff -puN drivers/mmc/host/ricoh_mmc.c~ricoh_mmc-port-from-driver-to-pci-quirk /dev/null
> --- a/drivers/mmc/host/ricoh_mmc.c
> +++ /dev/null
> @@ -1,262 +0,0 @@
> -/*
> - * 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@...mni.utexas.net>");
> -MODULE_DESCRIPTION("Ricoh MMC Controller disabling driver");
> -MODULE_LICENSE("GPL");
> -
> diff -puN drivers/pci/quirks.c~ricoh_mmc-port-from-driver-to-pci-quirk drivers/pci/quirks.c
> --- a/drivers/pci/quirks.c~ricoh_mmc-port-from-driver-to-pci-quirk
> +++ a/drivers/pci/quirks.c
> @@ -2515,6 +2515,98 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_I
>
> #endif /* CONFIG_PCI_IOV */
>
> +/*
> + * This is a quirk for Ricoh MMC controller found as a part of
> + * mulifunction chip.
> +
> + * This is very similiar and based on ricoh_mmc driver
> + * written by Philip Langdale. Thank you for these magic sequencies.
"sequences"
> +
> + * These chips implement the four main memory card
> + * controllers (SD, MMC, MS, xD) and one or both
Reformat the paragraph?
> + * 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 becames function
"becomes"
> + * #1, and therefore is confusing 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);
> +
> + printk(KERN_NOTICE "pci: Ricoh MMC controller disabled\n");
> + printk(KERN_NOTICE "pci: mmc cards will be supported through SDHCI\n");
dev_notice? I'd prefer it and all other quirks use dev_*, too.
> +}
> +
> +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);
> +
> + printk(KERN_NOTICE "pci: Ricoh MMC controller disabled\n");
> + printk(KERN_NOTICE "pci: mmc cards will be supported through SDHCI\n");
dev_notice?
> +}
> +
> +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);
> +
> +
> +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);
Like the other quirks, the declare statements should be directly after the
corresponding fixup-function.
> +
> +#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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Thanks for the work!
Wolfram
--
Pengutronix e.K. | Wolfram Sang |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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