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authorPierre Ossman <drzeus@drzeus.cx>2006-06-30 02:22:31 -0700
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-07-02 16:54:56 +0100
commit6743527441430586aa82a0dee1b2700a2a974ebc (patch)
tree6977160737a9d300c236bde53fb8ca5535e8bafb
parentd96649ed5ace812ffc8d86252d7c663326ca47f8 (diff)
[MMC] sdhci: more DMA capabilities tests
Properly test for controller interface to see if it's DMA capable. As many controllers are misconfigured in this regard, also add debug parameters to force DMA support either way. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--drivers/mmc/sdhci.c30
-rw-r--r--drivers/mmc/sdhci.h4
2 files changed, 33 insertions, 1 deletions
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 06dec744d53..315ab49e4b2 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -28,6 +28,9 @@
#define DBG(f, x...) \
pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
+static unsigned int debug_nodma = 0;
+static unsigned int debug_forcedma = 0;
+
static const struct pci_device_id pci_ids[] __devinitdata = {
/* handle any SD host controller */
{PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)},
@@ -1105,6 +1108,16 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
return -ENODEV;
}
+ if ((pdev->class & 0x0000FF) == PCI_SDHCI_IFVENDOR) {
+ printk(KERN_ERR DRIVER_NAME ": Vendor specific interface. Aborting.\n");
+ return -ENODEV;
+ }
+
+ if ((pdev->class & 0x0000FF) > PCI_SDHCI_IFVENDOR) {
+ printk(KERN_ERR DRIVER_NAME ": Unknown interface. Aborting.\n");
+ return -ENODEV;
+ }
+
mmc = mmc_alloc_host(sizeof(struct sdhci_host), &pdev->dev);
if (!mmc)
return -ENOMEM;
@@ -1146,7 +1159,16 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
- if ((caps & SDHCI_CAN_DO_DMA) && ((pdev->class & 0x0000FF) == 0x01))
+ if (debug_nodma)
+ DBG("DMA forced off\n");
+ else if (debug_forcedma) {
+ DBG("DMA forced on\n");
+ host->flags |= SDHCI_USE_DMA;
+ } else if ((pdev->class & 0x0000FF) != PCI_SDHCI_IFDMA)
+ DBG("Controller doesn't have DMA interface\n");
+ else if (!(caps & SDHCI_CAN_DO_DMA))
+ DBG("Controller doesn't have DMA capability\n");
+ else
host->flags |= SDHCI_USE_DMA;
if (host->flags & SDHCI_USE_DMA) {
@@ -1429,7 +1451,13 @@ static void __exit sdhci_drv_exit(void)
module_init(sdhci_drv_init);
module_exit(sdhci_drv_exit);
+module_param(debug_nodma, uint, 0444);
+module_param(debug_forcedma, uint, 0444);
+
MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
MODULE_DESCRIPTION("Secure Digital Host Controller Interface driver");
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");
+
+MODULE_PARM_DESC(debug_nodma, "Forcefully disable DMA transfers. (default 0)");
+MODULE_PARM_DESC(debug_forcedma, "Forcefully enable DMA transfers. (default 0)");
diff --git a/drivers/mmc/sdhci.h b/drivers/mmc/sdhci.h
index 758cf1c2436..8111fa38c05 100644
--- a/drivers/mmc/sdhci.h
+++ b/drivers/mmc/sdhci.h
@@ -12,6 +12,10 @@
* PCI registers
*/
+#define PCI_SDHCI_IFPIO 0x00
+#define PCI_SDHCI_IFDMA 0x01
+#define PCI_SDHCI_IFVENDOR 0x02
+
#define PCI_SLOT_INFO 0x40 /* 8 bits */
#define PCI_SLOT_INFO_SLOTS(x) ((x >> 4) & 7)
#define PCI_SLOT_INFO_FIRST_BAR_MASK 0x07