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authorNicolas Ferre <nicolas.ferre@atmel.com>2009-12-15 05:01:30 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 19:53:35 +0300
commit2635d1ba711560d521f6218c585a3e0401f566e1 (patch)
tree11c8f09f15cd2f19bfd6f2d2d9b2cac67544179f /arch/avr32
parentbd68e0838fe85794b06892054772fa013a8d1986 (diff)
downloadlinux-2635d1ba711560d521f6218c585a3e0401f566e1.tar.xz
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>
Diffstat (limited to 'arch/avr32')
-rw-r--r--arch/avr32/mach-at32ap/at32ap700x.c18
-rw-r--r--arch/avr32/mach-at32ap/include/mach/atmel-mci.h24
2 files changed, 37 insertions, 5 deletions
diff --git a/arch/avr32/mach-at32ap/at32ap700x.c b/arch/avr32/mach-at32ap/at32ap700x.c
index eb9d4dc2e86d..b40ff39e0ac8 100644
--- a/arch/avr32/mach-at32ap/at32ap700x.c
+++ b/arch/avr32/mach-at32ap/at32ap700x.c
@@ -15,6 +15,8 @@
#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include <linux/usb/atmel_usba_udc.h>
+
+#include <mach/atmel-mci.h>
#include <linux/atmel-mci.h>
#include <asm/io.h>
@@ -1320,7 +1322,7 @@ struct platform_device *__init
at32_add_device_mci(unsigned int id, struct mci_platform_data *data)
{
struct platform_device *pdev;
- struct dw_dma_slave *dws = &data->dma_slave;
+ struct mci_dma_slave *slave;
u32 pioa_mask;
u32 piob_mask;
@@ -1339,13 +1341,17 @@ at32_add_device_mci(unsigned int id, struct mci_platform_data *data)
ARRAY_SIZE(atmel_mci0_resource)))
goto fail;
- dws->dma_dev = &dw_dmac0_device.dev;
- dws->reg_width = DW_DMA_SLAVE_WIDTH_32BIT;
- dws->cfg_hi = (DWC_CFGH_SRC_PER(0)
+ slave = kzalloc(sizeof(struct mci_dma_slave), GFP_KERNEL);
+
+ slave->sdata.dma_dev = &dw_dmac0_device.dev;
+ slave->sdata.reg_width = DW_DMA_SLAVE_WIDTH_32BIT;
+ slave->sdata.cfg_hi = (DWC_CFGH_SRC_PER(0)
| DWC_CFGH_DST_PER(1));
- dws->cfg_lo &= ~(DWC_CFGL_HS_DST_POL
+ slave->sdata.cfg_lo &= ~(DWC_CFGL_HS_DST_POL
| DWC_CFGL_HS_SRC_POL);
+ data->dma_slave = slave;
+
if (platform_device_add_data(pdev, data,
sizeof(struct mci_platform_data)))
goto fail;
@@ -1411,6 +1417,8 @@ at32_add_device_mci(unsigned int id, struct mci_platform_data *data)
return pdev;
fail:
+ data->dma_slave = NULL;
+ kfree(slave);
platform_device_put(pdev);
return NULL;
}
diff --git a/arch/avr32/mach-at32ap/include/mach/atmel-mci.h b/arch/avr32/mach-at32ap/include/mach/atmel-mci.h
new file mode 100644
index 000000000000..a9b38967f703
--- /dev/null
+++ b/arch/avr32/mach-at32ap/include/mach/atmel-mci.h
@@ -0,0 +1,24 @@
+#ifndef __MACH_ATMEL_MCI_H
+#define __MACH_ATMEL_MCI_H
+
+#include <linux/dw_dmac.h>
+
+/**
+ * struct mci_dma_data - DMA data for MCI interface
+ */
+struct mci_dma_data {
+ struct dw_dma_slave sdata;
+};
+
+/* accessor macros */
+#define slave_data_ptr(s) (&(s)->sdata)
+#define find_slave_dev(s) ((s)->sdata.dma_dev)
+
+#define setup_dma_addr(s, t, r) do { \
+ if (s) { \
+ (s)->sdata.tx_reg = (t); \
+ (s)->sdata.rx_reg = (r); \
+ } \
+} while (0)
+
+#endif /* __MACH_ATMEL_MCI_H */