[PATCH] mmc: extend ricoh_mmc to support Ricoh RL5c476

Frank Seidel
2008-01-31T17:38:37Z

From: Frank Seidel <fseidel@suse.de>

This patch (based on current linus git tree) 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>
---
drivers/mmc/host/ricoh_mmc.c | 91 +++++++++++++++++++++++++++++++++++--------
1 file changed, 75 insertions(+), 16 deletions(-)

--- a/drivers/mmc/host/ricoh_mmc.c
+++ b/drivers/mmc/host/ricoh_mmc.c
@@ -45,8 +45,10 @@ static int __devinit ricoh_mmc_probe(str
const struct pci_device_id *ent)
{
u8 rev;
+ u8 ctrlfound = 0;

struct pci_dev *fw_dev = NULL;
+ struct pci_dev *main_dev = NULL; /* for Ricoh RL5c476 II */

BUG_ON(pdev == NULL);
BUG_ON(ent == NULL);
@@ -58,7 +60,47 @@ static int __devinit ricoh_mmc_probe(str
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_R5C832, fw_dev))) {
+ /* disable mmc controller via main function (RL5C476) */
+ while ((main_dev =
+ pci_get_device(PCI_VENDOR_ID_RICOH,
+ PCI_DEVICE_ID_RICOH_RL5C476, main_dev))) {
+ if (PCI_SLOT(pdev->devfn) == PCI_SLOT(main_dev->devfn) &&
+ pdev->bus == main_dev->bus) {
+ u8 write_enable;
+ u8 write_target;
+ u8 disable;
+
+ pci_read_config_byte(main_dev, 0xB7, &disable);
+ if (disable & 0x02) {
+ printk(KERN_INFO DRIVER_NAME
+ ": Controller already disabled. " \
+ "Nothing to do.\n");
+ return -ENODEV;
+ }
+
+ pci_read_config_byte(main_dev, 0x8E, &write_enable);
+ pci_write_config_byte(main_dev, 0x8E, 0xAA);
+ pci_read_config_byte(main_dev, 0x8D, &write_target);
+ pci_write_config_byte(main_dev, 0x8D, 0xB7);
+ pci_write_config_byte(main_dev, 0xB7, disable | 0x02);
+ pci_write_config_byte(main_dev, 0x8E, write_enable);
+ pci_write_config_byte(main_dev, 0x8D, write_target);
+
+ pci_set_drvdata(pdev, main_dev);
+
+ printk(KERN_INFO DRIVER_NAME
+ ": Controller is now disabled " \
+ "(via R5L5C476).\n");
+
+ ctrlfound = 1;
+ break;
+ }
+ }
+
+ /* disable mmc controller via firewire function (R5C832) */
+ 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) {
u8 write_enable;
@@ -67,7 +109,8 @@ static int __devinit ricoh_mmc_probe(str
pci_read_config_byte(fw_dev, 0xCB, &disable);
if (disable & 0x02) {
printk(KERN_INFO DRIVER_NAME
- ": Controller already disabled. Nothing to do.\n");
+ ": Controller already disabled. " \
+ "Nothing to do.\n");
return -ENODEV;
}

@@ -79,15 +122,16 @@ static int __devinit ricoh_mmc_probe(str
pci_set_drvdata(pdev, fw_dev);

printk(KERN_INFO DRIVER_NAME
- ": Controller is now disabled.\n");
+ ": Controller is now disabled (via R5C832).\n");

- break;
+ ctrlfound = 1;
}
}

- if (pci_get_drvdata(pdev) == NULL) {
+ if (!ctrlfound) {
printk(KERN_WARNING DRIVER_NAME
- ": Main firewire function not found. Cannot disable controller.\n");
+ ": Needed function was not found. " \
+ "Cannot disable controller.\n");
return -ENODEV;
}

@@ -97,20 +141,35 @@ static int __devinit ricoh_mmc_probe(str
static void __devexit ricoh_mmc_remove(struct pci_dev *pdev)
{
u8 write_enable;
+ u8 write_target;
u8 disable;
- struct pci_dev *fw_dev = NULL;
+ struct pci_dev *ctrl_dev = NULL;

- fw_dev = pci_get_drvdata(pdev);
- BUG_ON(fw_dev == NULL);
+ ctrl_dev = pci_get_drvdata(pdev);
+ BUG_ON(ctrl_dev == NULL);

- 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);
+ if (ctrl_dev->device == PCI_DEVICE_ID_RICOH_RL5C476) {
+ pci_read_config_byte(ctrl_dev, 0x8E, &write_enable);
+ pci_write_config_byte(ctrl_dev, 0x8E, 0xAA);
+ pci_read_config_byte(ctrl_dev, 0x8D, &write_target);
+ pci_write_config_byte(ctrl_dev, 0x8D, 0xB7);
+ pci_read_config_byte(ctrl_dev, 0xB7, &disable);
+ pci_write_config_byte(ctrl_dev, 0xB7, disable & ~0x02);
+ pci_write_config_byte(ctrl_dev, 0x8E, write_enable);
+ pci_write_config_byte(ctrl_dev, 0x8D, write_target);
+
+ printk(KERN_INFO DRIVER_NAME
+ ": Controller is now re-enabled (via R5L5C476).\n");
+ } else {
+ pci_read_config_byte(ctrl_dev, 0xCA, &write_enable);
+ pci_read_config_byte(ctrl_dev, 0xCB, &disable);
+ pci_write_config_byte(ctrl_dev, 0xCA, 0x57);
+ pci_write_config_byte(ctrl_dev, 0xCB, disable & ~0x02);
+ pci_write_config_byte(ctrl_dev, 0xCA, write_enable);

- printk(KERN_INFO DRIVER_NAME
- ": Controller is now re-enabled.\n");
+ printk(KERN_INFO DRIVER_NAME
+ ": Controller is now re-enabled (via R5C832).\n");
+ }

pci_set_drvdata(pdev, NULL);
}