linux-kernel - [PATCH v3 31/36] mtd: st_spi_fsm: Add the ability to read the FSM's status

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Message-Id: <1385727565-25794-32-git-send-email-lee.jones@linaro.org>
Date:	Fri, 29 Nov 2013 12:19:20 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dwmw2@...radead.org
Cc:	linus.walleij@...aro.org, linux-mtd@...ts.infradead.org,
	angus.clark@...com, Lee Jones <lee.jones@...aro.org>
Subject: [PATCH v3 31/36] mtd: st_spi_fsm: Add the ability to read the FSM's status

Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/mtd/devices/st_spi_fsm.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
index ecb001d..1d6bd94 100644
--- a/drivers/mtd/devices/st_spi_fsm.c
+++ b/drivers/mtd/devices/st_spi_fsm.c
@@ -365,6 +365,30 @@ static uint8_t stfsm_wait_busy(struct stfsm *fsm)
 	return -EIO;
 }
 
+static int stfsm_read_status(struct stfsm *fsm, uint8_t cmd,
+			   uint8_t *status)
+{
+	struct stfsm_seq *seq = &stfsm_seq_read_status_fifo;
+	uint32_t tmp;
+
+	dev_dbg(fsm->dev, "reading STA[%s]\n",
+		(cmd == FLASH_CMD_RDSR) ? "1" : "2");
+
+	seq->seq_opc[0] = (SEQ_OPC_PADS_1 |
+			   SEQ_OPC_CYCLES(8) |
+			   SEQ_OPC_OPCODE(cmd)),
+
+	stfsm_load_seq(fsm, seq);
+
+	stfsm_read_fifo(fsm, &tmp, 4);
+
+	*status = (uint8_t)(tmp >> 24);
+
+	stfsm_wait_seq(fsm);
+
+	return 0;
+}
+
 static int stfsm_wrvcr(struct stfsm *fsm, uint8_t data)
 {
 	struct stfsm_seq *seq = &stfsm_seq_wrvcr;
-- 
1.8.3.2

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