linux-kernel - [PATCH v3 22/36] mtd: st_spi_fsm: Provide the default read/write configurations

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Message-Id: <1385727565-25794-23-git-send-email-lee.jones@linaro.org>
Date:	Fri, 29 Nov 2013 12:19:11 +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 22/36] mtd: st_spi_fsm: Provide the default read/write configurations

Message sequences can vary depending on how many pads (lines) are
required to address the chip (mode & dummy), how many data pads (lines)
are required to write out to the chip which will determine speed
amongst other things which are detailed by the SFDP specification. We
are able to use multiple configurations for each chip, but they need
to me matched to a device's capabilities. These configurations are
listed in preference order - most preferred first.

Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/mtd/devices/st_spi_fsm.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
index 9449005..0ecf248 100644
--- a/drivers/mtd/devices/st_spi_fsm.c
+++ b/drivers/mtd/devices/st_spi_fsm.c
@@ -28,6 +28,33 @@
 #include "st_spi_fsm.h"
 #include "serial_flash_cmds.h"
 
+/*
+ * FSM message sequence configurations:
+ *
+ * All configs are presented in order of preference
+ */
+
+/* Default READ configurations, in order of preference */
+static struct seq_rw_config default_read_configs[] = {
+	{FLASH_FLAG_READ_1_4_4, FLASH_CMD_READ_1_4_4,	0, 4, 4, 0x00, 2, 4},
+	{FLASH_FLAG_READ_1_1_4, FLASH_CMD_READ_1_1_4,	0, 1, 4, 0x00, 4, 0},
+	{FLASH_FLAG_READ_1_2_2, FLASH_CMD_READ_1_2_2,	0, 2, 2, 0x00, 4, 0},
+	{FLASH_FLAG_READ_1_1_2, FLASH_CMD_READ_1_1_2,	0, 1, 2, 0x00, 0, 8},
+	{FLASH_FLAG_READ_FAST,	FLASH_CMD_READ_FAST,	0, 1, 1, 0x00, 0, 8},
+	{FLASH_FLAG_READ_WRITE, FLASH_CMD_READ,		0, 1, 1, 0x00, 0, 0},
+	{0x00,			0,			0, 0, 0, 0x00, 0, 0},
+};
+
+/* Default WRITE configurations */
+static struct seq_rw_config default_write_configs[] = {
+	{FLASH_FLAG_WRITE_1_4_4, FLASH_CMD_WRITE_1_4_4, 1, 4, 4, 0x00, 0, 0},
+	{FLASH_FLAG_WRITE_1_1_4, FLASH_CMD_WRITE_1_1_4, 1, 1, 4, 0x00, 0, 0},
+	{FLASH_FLAG_WRITE_1_2_2, FLASH_CMD_WRITE_1_2_2, 1, 2, 2, 0x00, 0, 0},
+	{FLASH_FLAG_WRITE_1_1_2, FLASH_CMD_WRITE_1_1_2, 1, 1, 2, 0x00, 0, 0},
+	{FLASH_FLAG_READ_WRITE,  FLASH_CMD_WRITE,       1, 1, 1, 0x00, 0, 0},
+	{0x00,			 0,			 0, 0, 0, 0x00, 0, 0},
+};
+
 static struct stfsm_seq stfsm_seq_en_32bit_addr;/* Dynamically populated */
 
 static struct stfsm_seq stfsm_seq_read_jedec = {
-- 
1.8.3.2

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