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| author | Nicolas Ferre <nicolas.ferre@atmel.com> | 2009-12-14 18:01:30 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-15 08:53:35 -0800 |
| commit | 2635d1ba711560d521f6218c585a3e0401f566e1 (patch) | |
| tree | 11c8f09f15cd2f19bfd6f2d2d9b2cac67544179f /arch/avr32 | |
| parent | bd68e0838fe85794b06892054772fa013a8d1986 (diff) | |
| download | kernel_samsung_smdk4412-2635d1ba711560d521f6218c585a3e0401f566e1.zip kernel_samsung_smdk4412-2635d1ba711560d521f6218c585a3e0401f566e1.tar.gz kernel_samsung_smdk4412-2635d1ba711560d521f6218c585a3e0401f566e1.tar.bz2 | |
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.c | 18 | ||||
| -rw-r--r-- | arch/avr32/mach-at32ap/include/mach/atmel-mci.h | 24 |
2 files changed, 37 insertions, 5 deletions
diff --git a/arch/avr32/mach-at32ap/at32ap700x.c b/arch/avr32/mach-at32ap/at32ap700x.c index eb9d4dc..b40ff39 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 0000000..a9b3896 --- /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 */ |