Patchwork [v3,27/36] mtd: st_spi_fsm: Write to Flash via the FSM FIFO

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Submitter Lee Jones
Date Nov. 29, 2013, 12:19 p.m.
Message ID <1385727565-25794-28-git-send-email-lee.jones@linaro.org>
Download mbox | patch
Permalink /patch/295285/
State Accepted
Commit 30ca64f9f9db014755d632acffd0d2b507d7af6d
Headers show

Comments

Lee Jones - Nov. 29, 2013, 12:19 p.m.
When we write data to the FIFO the FSM Controller subsequently writes
that data out to the Serial Flash chip.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/mtd/devices/st_spi_fsm.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

Patch

diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
index c76510e..c08805f 100644
--- a/drivers/mtd/devices/st_spi_fsm.c
+++ b/drivers/mtd/devices/st_spi_fsm.c
@@ -261,6 +261,20 @@  static void stfsm_read_fifo(struct stfsm *fsm, uint32_t *buf,
 	}
 }
 
+static int stfsm_write_fifo(struct stfsm *fsm,
+			    const uint32_t *buf, const uint32_t size)
+{
+	uint32_t words = size >> 2;
+
+	dev_dbg(fsm->dev, "writing %d bytes to FIFO\n", size);
+
+	BUG_ON((((uint32_t)buf) & 0x3) || (size & 0x3));
+
+	writesl(fsm->base + SPI_FAST_SEQ_DATA_REG, buf, words);
+
+	return size;
+}
+
 static int stfsm_enter_32bit_addr(struct stfsm *fsm, int enter)
 {
 	struct stfsm_seq *seq = &stfsm_seq_en_32bit_addr;