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spi: ti_qspi: Use DMA to read from qspi flash

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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>
This commit is contained in:
Vignesh R 2015-08-17 15:20:13 +05:30 committed by Jagan Teki
parent 664ab2c992
commit 8ddd9c485f
1 changed files with 25 additions and 0 deletions
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25
drivers/spi/ti_qspi.c
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@ -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