mtd: st_spi_fsm: Supply a method to read from the FSM's FIFO (030e82dc) · Commits · 戴 / test

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>

drivers/mtd/devices/st_spi_fsm.c

+26 −0

Original line number	Diff line number	Diff line
		@@ -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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