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sdhci: scatter-gather (ADMA) support

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Add support for the scatter-gather DMA mode present on newer controllers.
As the mode requires 32-bit alignment, non-aligned chunks are handled by
using a bounce buffer.

Also add some new quirks to handle controllers that have bugs in the
ADMA engine.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Pierre Ossman
2008-06-28 18:28:51 +02:00
parent 93fc48c785
commit 2134a922c6
3 changed files with 407 additions and 44 deletions
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17
drivers/mmc/host/sdhci-pci.c
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@@ -142,6 +142,7 @@ static int jmicron_probe(struct sdhci_pci_chip *chip)
if (chip->pdev->revision == 0) {
chip->quirks |= SDHCI_QUIRK_32BIT_DMA_ADDR |
SDHCI_QUIRK_32BIT_DMA_SIZE |
SDHCI_QUIRK_32BIT_ADMA_SIZE |
SDHCI_QUIRK_RESET_AFTER_REQUEST;
}
@@ -206,6 +207,22 @@ static void jmicron_enable_mmc(struct sdhci_host *host, int on)
static int jmicron_probe_slot(struct sdhci_pci_slot *slot)
{
if (slot->chip->pdev->revision == 0) {
u16 version;
version = readl(slot->host->ioaddr + SDHCI_HOST_VERSION);
version = (version & SDHCI_VENDOR_VER_MASK) >>
SDHCI_VENDOR_VER_SHIFT;
/*
* Older versions of the chip have lots of nasty glitches
* in the ADMA engine. It's best just to avoid it
* completely.
*/
if (version < 0xAC)
slot->host->quirks |= SDHCI_QUIRK_BROKEN_ADMA;
}
/*
* The secondary interface requires a bit set to get the
* interrupts.