atmel-mci: change use of dma slave interface

Allow the use of another DMA controller driver in atmel-mci sd/mmc driver.
 This adds a generic dma_slave pointer to the mci platform structure where
we can store DMA controller information.  In atmel-mci we use information
provided by this structure to initialize the driver (with new helper
functions that are architecture dependant).

This also adds at32/avr32 chip modifications to cope with this new access
method.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 36 insertions, 20 deletions

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index fc25586b7ee1..ba8b219d44c1 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -25,6 +25,8 @@
 #include <linux/stat.h>
 
 #include <linux/mmc/host.h>
+
+#include <mach/atmel-mci.h>
 #include <linux/atmel-mci.h>
 
 #include <asm/io.h>
@@ -1584,14 +1586,43 @@ static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot,
 #ifdef CONFIG_MMC_ATMELMCI_DMA
 static bool filter(struct dma_chan *chan, void *slave)
 {
-        struct dw_dma_slave *dws = slave;
+        struct mci_dma_data     *sl = slave;
 
-        if (dws->dma_dev == chan->device->dev) {
-                chan->private = dws;
+        if (sl && find_slave_dev(sl) == chan->device->dev) {
+                chan->private = slave_data_ptr(sl);
                 return true;
-        } else
+        } else {
                 return false;
+        }
 }
+
+static void atmci_configure_dma(struct atmel_mci *host)
+{
+        struct mci_platform_data        *pdata;
+
+        if (host == NULL)
+                return;
+
+        pdata = host->pdev->dev.platform_data;
+
+        if (pdata && find_slave_dev(pdata->dma_slave)) {
+                dma_cap_mask_t mask;
+
+                setup_dma_addr(pdata->dma_slave,
+                               host->mapbase + MCI_TDR,
+                               host->mapbase + MCI_RDR);
+
+                /* Try to grab a DMA channel */
+                dma_cap_zero(mask);
+                dma_cap_set(DMA_SLAVE, mask);
+                host->dma.chan =
+                        dma_request_channel(mask, filter, pdata->dma_slave);
+        }
+        if (!host->dma.chan)
+                dev_notice(&host->pdev->dev, "DMA not available, using PIO\n");
+}
+#else
+static void atmci_configure_dma(struct atmel_mci *host) {}
 #endif
 
 static int __init atmci_probe(struct platform_device *pdev)
@@ -1645,22 +1676,7 @@ static int __init atmci_probe(struct platform_device *pdev)
         if (ret)
                 goto err_request_irq;
 
-#ifdef CONFIG_MMC_ATMELMCI_DMA
-        if (pdata->dma_slave.dma_dev) {
-                struct dw_dma_slave *dws = &pdata->dma_slave;
-                dma_cap_mask_t mask;
-
-                dws->tx_reg = regs->start + MCI_TDR;
-                dws->rx_reg = regs->start + MCI_RDR;
-
-                /* Try to grab a DMA channel */
-                dma_cap_zero(mask);
-                dma_cap_set(DMA_SLAVE, mask);
-                host->dma.chan = dma_request_channel(mask, filter, dws);
-        }
-        if (!host->dma.chan)
-                dev_notice(&pdev->dev, "DMA not available, using PIO\n");
-#endif /* CONFIG_MMC_ATMELMCI_DMA */
+        atmci_configure_dma(host);
 
         platform_set_drvdata(pdev, host);