linux-kernel - [PATCH v3 25/36] mtd: st_spi_fsm: Prepare default sequences for read/write/erase

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Date:	Fri, 29 Nov 2013 12:19:14 +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 25/36] mtd: st_spi_fsm: Prepare default sequences for read/write/erase

Most chips require a predefined set of FSM message sequences for read,
write and erase operations. This patch provides a way to set them up,
which it will do so if a chip specific initialisation routine isn't
been provided.

Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/mtd/devices/st_spi_fsm.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
index 2369da1..ad277f1 100644
--- a/drivers/mtd/devices/st_spi_fsm.c
+++ b/drivers/mtd/devices/st_spi_fsm.c
@@ -441,6 +441,38 @@ static int stfsm_search_prepare_rw_seq(struct stfsm *fsm,
 	return 0;
 }
 
+/* Prepare a READ/WRITE/ERASE 'default' sequences */
+static int stfsm_prepare_rwe_seqs_default(struct stfsm *fsm)
+{
+	uint32_t flags = fsm->info->flags;
+	int ret;
+
+	/* Configure 'READ' sequence */
+	ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_read,
+					  default_read_configs);
+	if (ret) {
+		dev_err(fsm->dev,
+			"failed to prep READ sequence with flags [0x%08x]\n",
+			flags);
+		return ret;
+	}
+
+	/* Configure 'WRITE' sequence */
+	ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_write,
+					  default_write_configs);
+	if (ret) {
+		dev_err(fsm->dev,
+			"failed to prep WRITE sequence with flags [0x%08x]\n",
+			flags);
+		return ret;
+	}
+
+	/* Configure 'ERASE_SECTOR' sequence */
+	stfsm_prepare_erasesec_seq(fsm, &stfsm_seq_erase_sector);
+
+	return 0;
+}
+
 static int stfsm_n25q_config(struct stfsm *fsm)
 {
 	uint32_t flags = fsm->info->flags;
@@ -756,6 +788,10 @@ static int stfsm_probe(struct platform_device *pdev)
 		ret = info->config(fsm);
 		if (ret)
 			return ret;
+	} else {
+		ret = stfsm_prepare_rwe_seqs_default(fsm);
+		if (ret)
+			return ret;
 	}
 
 	platform_set_drvdata(pdev, fsm);
-- 
1.8.3.2

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