Re: [PATCH] mmc: extend ricoh_mmc to support Ricoh RL5c476

From: Philip Langdale
Date: Sat Feb 02 2008 - 02:17:17 EST

Frank Seidel wrote:
> From: Frank Seidel <fseidel@xxxxxxx>
>
> 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.

Again, thanks a lot for investigating and finding the appropriate magic
incantations. My main comment is to please base this on top of my suspend/resume
patch which Pierre said he accepted but which isn't in his tree yet - I guess
he's busy offline right now - haven't heard from him in a while.

> Signed-off-by: Frank Seidel <fseidel@xxxxxxx>
> ---
> 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 */

There's no need to have two pointers. One will do fine.

> 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;

It feels like there's a bit too much code duplication going on here, but I think
that after you rebase the patch it'll look a lot tidier and I won't feel bad about
it :-)

> @@ -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;

Same as in probe. Just use one pointer.

> - 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);
> }
>

--phil
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