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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>
This commit is contained in:
Lee Jones 2014-03-20 09:20:37 +00:00 committed by Brian Norris
parent 3c8b85b340
commit 030e82dc63
1 changed files with 26 additions and 0 deletions
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26
drivers/mtd/devices/st_spi_fsm.c
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@ -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;