aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mmc/host/ricoh_mmc.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/mmc/host/ricoh_mmc.c')
-rw-r--r--drivers/mmc/host/ricoh_mmc.c262
1 files changed, 0 insertions, 262 deletions
diff --git a/drivers/mmc/host/ricoh_mmc.c b/drivers/mmc/host/ricoh_mmc.c
deleted file mode 100644
index f62790513322..000000000000
--- 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@alumni.utexas.net>");
-MODULE_DESCRIPTION("Ricoh MMC Controller disabling driver");
-MODULE_LICENSE("GPL");
-
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.