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[U-Boot,U-Boot,RESEND,v2,09/10] spi: ti_qspi: Use DMA to read from qspi flash

Message ID 1439805013-3385-1-git-send-email-vigneshr@ti.com
State Accepted
Delegated to: Jagannadha Sutradharudu Teki
Headers show

Commit Message

Raghavendra, Vignesh Aug. 17, 2015, 9:50 a.m. UTC 
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>
---
 * Added a TODO comment

 drivers/spi/ti_qspi.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
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Patch

diff --git a/drivers/spi/ti_qspi.c b/drivers/spi/ti_qspi.c
index 3356c0f072e5..c148d1cadfbd 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