linux-kernel - [PATCH v6 19/36] mtd: st_spi_fsm: Provide a method to put the chip into 32bit addressing mode

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Message-Id: <1395307268-12721-20-git-send-email-lee.jones@linaro.org>
Date:	Thu, 20 Mar 2014 09:20:51 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	computersforpeace@...il.com
Cc:	linux-mtd@...ts.infradead.org, dwmw2@...radead.org,
	Angus.Clark@...com, Lee Jones <lee.jones@...aro.org>
Subject: [PATCH v6 19/36] mtd: st_spi_fsm: Provide a method to put the chip into 32bit addressing mode

Most Serial Flash chips support 24bit addressing as a default but more
recent incarnations can support 32bit. Based on information provided
though platform specific data and capabilities we can determine whether
or not our current chip can. This patch provides a means to setup the
FSM message sequence to put the chip into 32bit mode.

Acked-by Angus Clark <angus.clark@...com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/mtd/devices/st_spi_fsm.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
index 7cc4425..0a5b702 100644
--- a/drivers/mtd/devices/st_spi_fsm.c
+++ b/drivers/mtd/devices/st_spi_fsm.c
@@ -375,6 +375,8 @@ static struct flash_info flash_types[] = {
 	{ NULL, 0x000000, 0, 0, 0, 0, 0, NULL },
 };
 
+static struct stfsm_seq stfsm_seq_en_32bit_addr;/* Dynamically populated */
+
 static struct stfsm_seq stfsm_seq_read_jedec = {
 	.data_size = TRANSFER_SIZE(8),
 	.seq_opc[0] = (SEQ_OPC_PADS_1 |
@@ -523,6 +525,23 @@ static void stfsm_read_fifo(struct stfsm *fsm, uint32_t *buf,
 	}
 }
 
+static int stfsm_enter_32bit_addr(struct stfsm *fsm, int enter)
+{
+	struct stfsm_seq *seq = &stfsm_seq_en_32bit_addr;
+	uint32_t cmd = enter ? FLASH_CMD_EN4B_ADDR : FLASH_CMD_EX4B_ADDR;
+
+	seq->seq_opc[0] = (SEQ_OPC_PADS_1 |
+			   SEQ_OPC_CYCLES(8) |
+			   SEQ_OPC_OPCODE(cmd) |
+			   SEQ_OPC_CSDEASSERT);
+
+	stfsm_load_seq(fsm, seq);
+
+	stfsm_wait_seq(fsm);
+
+	return 0;
+}
+
 /*
  * SoC reset on 'boot-from-spi' systems
  *
-- 
1.8.3.2

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