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authorLee Jones <lee.jones@linaro.org>2014-03-20 09:20:37 +0000
committerBrian Norris <computersforpeace@gmail.com>2014-03-20 04:17:14 -0700
commit030e82dc6386f23bcd05876b452d2618dd8046b4 (patch)
tree8412fe7b0fce3ab9aa06615fd72544d63e81a67d /drivers/mtd
parent3c8b85b340c7a6b47d50c12c03661c23a5858b88 (diff)
downloadop-kernel-dev-030e82dc6386f23bcd05876b452d2618dd8046b4.zip
op-kernel-dev-030e82dc6386f23bcd05876b452d2618dd8046b4.tar.gz
mtd: st_spi_fsm: Supply a method to read from the FSM's FIFO
When invoked the driver will attempt to read any available data from the FSM's data register. Any data collected from this FIFO would have originated from the 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>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/devices/st_spi_fsm.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
index 5e22c86..73e0f27 100644
--- a/drivers/mtd/devices/st_spi_fsm.c
+++ b/drivers/mtd/devices/st_spi_fsm.c
@@ -281,6 +281,32 @@ static void stfsm_wait_seq(struct stfsm *fsm)
dev_err(fsm->dev, "timeout on sequence completion\n");
}
+static void stfsm_read_fifo(struct stfsm *fsm, uint32_t *buf,
+ const uint32_t size)
+{
+ uint32_t remaining = size >> 2;
+ uint32_t avail;
+ uint32_t words;
+
+ dev_dbg(fsm->dev, "Reading %d bytes from FIFO\n", size);
+
+ BUG_ON((((uint32_t)buf) & 0x3) || (size & 0x3));
+
+ while (remaining) {
+ for (;;) {
+ avail = stfsm_fifo_available(fsm);
+ if (avail)
+ break;
+ udelay(1);
+ }
+ words = min(avail, remaining);
+ remaining -= words;
+
+ readsl(fsm->base + SPI_FAST_SEQ_DATA_REG, buf, words);
+ buf += words;
+ }
+}
+
static int stfsm_set_mode(struct stfsm *fsm, uint32_t mode)
{
int ret, timeout = 10;
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