+++ /dev/null
-/*
- * 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");
-
#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)
{
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff