From 030e82dc6386f23bcd05876b452d2618dd8046b4 Mon Sep 17 00:00:00 2001 From: Lee Jones Date: Thu, 20 Mar 2014 09:20:37 +0000 Subject: [PATCH] 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 Signed-off-by: Lee Jones Signed-off-by: Brian Norris --- drivers/mtd/devices/st_spi_fsm.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c index 5e22c8688197..73e0f2731bcb 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; -- 2.20.1