diff options
| author | Vignesh R <vigneshr@ti.com> | 2015-08-17 15:20:13 +0530 |
|---|---|---|
| committer | Jagan Teki <jteki@openedev.com> | 2015-08-17 23:29:15 +0530 |
| commit | 8ddd9c485f17de4bea55707f5b9cf07fd0a89ed0 (patch) | |
| tree | 73e2e59fa074d442d79c9a74bd9d937e0b886edf /drivers | |
| parent | 664ab2c992d1e06c4381f66c93d2e155fc7722e1 (diff) | |
| download | talos-obmc-uboot-8ddd9c485f17de4bea55707f5b9cf07fd0a89ed0.tar.gz talos-obmc-uboot-8ddd9c485f17de4bea55707f5b9cf07fd0a89ed0.zip | |
spi: ti_qspi: Use DMA to read from qspi flash
ti_qspi uses memory map mode for faster read. Enabling DMA will increase
read speed by 3x @48MHz on DRA74 EVM.
Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/ti_qspi.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/spi/ti_qspi.c b/drivers/spi/ti_qspi.c index af40ec864f..bd63db8a2a 100644 --- a/drivers/spi/ti_qspi.c +++ b/drivers/spi/ti_qspi.c @@ -13,6 +13,8 @@ #include <spi.h> #include <asm/gpio.h> #include <asm/omap_gpio.h> +#include <asm/omap_common.h> +#include <asm/ti-common/ti-edma3.h> /* ti qpsi register bit masks */ #define QSPI_TIMEOUT 2000000 @@ -347,3 +349,26 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, return 0; } + +/* TODO: control from sf layer to here through dm-spi */ +#ifdef CONFIG_TI_EDMA3 +void spi_flash_copy_mmap(void *data, void *offset, size_t len) +{ + unsigned int addr = (unsigned int) (data); + unsigned int edma_slot_num = 1; + + /* Invalidate the area, so no writeback into the RAM races with DMA */ + invalidate_dcache_range(addr, addr + roundup(len, ARCH_DMA_MINALIGN)); + + /* enable edma3 clocks */ + enable_edma3_clocks(); + + /* Call edma3 api to do actual DMA transfer */ + edma3_transfer(EDMA3_BASE, edma_slot_num, data, offset, len); + + /* disable edma3 clocks */ + disable_edma3_clocks(); + + *((unsigned int *)offset) += len; +} +#endif |
