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ricoh_mmc: Handle newer models of Ricoh controllers

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The latest generation of laptops are shipping with a newer
model of Ricoh chip where the firewire controller is the
primary PCI function but a cardbus controller is also present.

The existing code assumes that if a cardbus controller is,
present, then it must be the one to manipulate - but the real
rule is that you manipulate PCI function 0. This patch adds an
additional constraint that the target must be function 0.

Signed-off-by: Philip Langdale <philipl@overt.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
philipl@overt.org 2008-11-30 20:27:50 -05:00 committed by Pierre Ossman
parent b30f8af335
commit 0527a60c2b
1 changed files with 11 additions and 6 deletions
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17
drivers/mmc/host/ricoh_mmc.c
View file

@ -11,9 +11,10 @@
/*
* 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
* 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.
@ -21,8 +22,10 @@
* 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.
* 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>
@ -143,6 +146,7 @@ static int __devinit ricoh_mmc_probe(struct pci_dev *pdev,
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;
@ -160,6 +164,7 @@ static int __devinit ricoh_mmc_probe(struct pci_dev *pdev,
(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;
@ -172,7 +177,7 @@ static int __devinit ricoh_mmc_probe(struct pci_dev *pdev,
if (!ctrlfound) {
printk(KERN_WARNING DRIVER_NAME
": Main firewire function not found. Cannot disable controller.\n");
": Main Ricoh function not found. Cannot disable controller.\n");
return -ENODEV;
}