diff options
Diffstat (limited to 'drivers/mmc/sdhci.c')
| -rw-r--r-- | drivers/mmc/sdhci.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c index 06dec744d53e..315ab49e4b2c 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)"); |