882c49164d
This patch adds support for the Ricoh RL5c476 chip: with this the mmc adapter that needs this disabler (R5C843) can also be handled correctly when it sits on a RL5c476. Signed-off-by: Frank Seidel <fseidel@suse.de> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
258 lines
6.7 KiB
C
258 lines
6.7 KiB
C
/*
|
|
* 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 R5C832 works. This chip implements firewire
|
|
* and four different memory card controllers. Two of those controllers are
|
|
* an SDHCI controller and a proprietary MMC controller. 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.
|
|
*
|
|
* The relevant registers live on the firewire function, so this is 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) &&
|
|
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) &&
|
|
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 firewire 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(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(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 = ricoh_mmc_suspend,
|
|
.resume = ricoh_mmc_resume,
|
|
};
|
|
|
|
/*****************************************************************************\
|
|
* *
|
|
* 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");
|
|
|