mtd: st_spi_fsm: Write to Flash via the FSM FIFO

When we write data to the FIFO the FSM Controller subsequently writes
that data out to the Serial Flash chip.

Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
index b1a65c1359d5b0bac1cd520e7b0b25b270ffb629..58b8761dc30eb81618998c43615f2b7eccc81998 100644 (file)
--- a/drivers/mtd/devices/st_spi_fsm.c
+++ b/drivers/mtd/devices/st_spi_fsm.c
@@ -668,6 +668,20 @@ 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;