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Message-Id: <1389188840-14306-37-git-send-email-lee.jones@linaro.org>
Date: Wed, 8 Jan 2014 13:47:19 +0000
From: Lee Jones <lee.jones@...aro.org>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: computersforpeace@...il.com, angus.clark@...com,
Lee Jones <lee.jones@...aro.org>
Subject: [PATCH v4 36/37] mtd: st_spi_fsm: Move runtime configurable msg sequences into device's struct
Until now the dynamically configurable message sequences for read, write
and enable 32bit addressing have been global. Brian makes a good point
why this should not be the case. If there are ever two FSM's located on
the same platform, we could be potentially introducing a race condition
on "needlessly shared data".
Suggested-by: Brian Norris <computersforpeace@...il.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
drivers/mtd/devices/st_spi_fsm.c | 64 ++++++++++++++++++++--------------------
1 file changed, 32 insertions(+), 32 deletions(-)
diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
index ddfff35..541e867 100644
--- a/drivers/mtd/devices/st_spi_fsm.c
+++ b/drivers/mtd/devices/st_spi_fsm.c
@@ -271,6 +271,19 @@
#define CFG_ERASESEC_TOGGLE_32BIT_ADDR 0x00000008
#define CFG_S25FL_CHECK_ERROR_FLAGS 0x00000010
+struct stfsm_seq {
+ uint32_t data_size;
+ uint32_t addr1;
+ uint32_t addr2;
+ uint32_t addr_cfg;
+ uint32_t seq_opc[5];
+ uint32_t mode;
+ uint32_t dummy;
+ uint32_t status;
+ uint8_t seq[16];
+ uint32_t seq_cfg;
+} __packed __aligned(4);
+
struct stfsm {
struct device *dev;
void __iomem *base;
@@ -284,20 +297,11 @@ struct stfsm {
bool booted_from_spi;
bool reset_signal;
bool reset_por;
-};
-struct stfsm_seq {
- uint32_t data_size;
- uint32_t addr1;
- uint32_t addr2;
- uint32_t addr_cfg;
- uint32_t seq_opc[5];
- uint32_t mode;
- uint32_t dummy;
- uint32_t status;
- uint8_t seq[16];
- uint32_t seq_cfg;
-} __packed __aligned(4);
+ struct stfsm_seq stfsm_seq_read;
+ struct stfsm_seq stfsm_seq_write;
+ struct stfsm_seq stfsm_seq_en_32bit_addr;
+};
/* Parameters to configure a READ or WRITE FSM sequence */
struct seq_rw_config {
@@ -585,10 +589,6 @@ static struct seq_rw_config stfsm_s25fl_write4_configs[] = {
*/
#define W25Q_STATUS_QE (0x1 << 9)
-static struct stfsm_seq stfsm_seq_read; /* Dynamically populated */
-static struct stfsm_seq stfsm_seq_write; /* Dynamically populated */
-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 |
@@ -819,7 +819,7 @@ static int stfsm_write_fifo(struct stfsm *fsm,
static int stfsm_enter_32bit_addr(struct stfsm *fsm, int enter)
{
- struct stfsm_seq *seq = &stfsm_seq_en_32bit_addr;
+ struct stfsm_seq *seq = &fsm->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 |
@@ -1091,7 +1091,7 @@ static int stfsm_prepare_rwe_seqs_default(struct stfsm *fsm)
int ret;
/* Configure 'READ' sequence */
- ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_read,
+ ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_read,
default_read_configs);
if (ret) {
dev_err(fsm->dev,
@@ -1101,7 +1101,7 @@ static int stfsm_prepare_rwe_seqs_default(struct stfsm *fsm)
}
/* Configure 'WRITE' sequence */
- ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_write,
+ ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_write,
default_write_configs);
if (ret) {
dev_err(fsm->dev,
@@ -1136,7 +1136,7 @@ static int stfsm_mx25_config(struct stfsm *fsm)
*/
if (flags & FLASH_FLAG_32BIT_ADDR) {
/* Configure 'enter_32bitaddr' FSM sequence */
- stfsm_mx25_en_32bit_addr_seq(&stfsm_seq_en_32bit_addr);
+ stfsm_mx25_en_32bit_addr_seq(&fsm->stfsm_seq_en_32bit_addr);
soc_reset = stfsm_can_handle_soc_reset(fsm);
if (soc_reset || !fsm->booted_from_spi) {
@@ -1159,7 +1159,7 @@ static int stfsm_mx25_config(struct stfsm *fsm)
}
/* For QUAD mode, set 'QE' STATUS bit */
- data_pads = ((stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1;
+ data_pads = ((fsm->stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1;
if (data_pads == 4) {
stfsm_read_status(fsm, FLASH_CMD_RDSR, &sta);
sta |= MX25_STATUS_QE;
@@ -1178,10 +1178,10 @@ static int stfsm_n25q_config(struct stfsm *fsm)
/* Configure 'READ' sequence */
if (flags & FLASH_FLAG_32BIT_ADDR)
- ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_read,
+ ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_read,
n25q_read4_configs);
else
- ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_read,
+ ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_read,
n25q_read3_configs);
if (ret) {
dev_err(fsm->dev,
@@ -1191,7 +1191,7 @@ static int stfsm_n25q_config(struct stfsm *fsm)
}
/* Configure 'WRITE' sequence (default configs) */
- ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_write,
+ ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_write,
default_write_configs);
if (ret) {
dev_err(fsm->dev,
@@ -1205,7 +1205,7 @@ static int stfsm_n25q_config(struct stfsm *fsm)
/* Configure 32-bit address support */
if (flags & FLASH_FLAG_32BIT_ADDR) {
- stfsm_n25q_en_32bit_addr_seq(&stfsm_seq_en_32bit_addr);
+ stfsm_n25q_en_32bit_addr_seq(&fsm->stfsm_seq_en_32bit_addr);
soc_reset = stfsm_can_handle_soc_reset(fsm);
if (soc_reset || !fsm->booted_from_spi) {
@@ -1364,12 +1364,12 @@ static int stfsm_s25fl_config(struct stfsm *fsm)
* Prepare Read/Write/Erase sequences according to S25FLxxx
* 32-bit address command set
*/
- ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_read,
+ ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_read,
stfsm_s25fl_read4_configs);
if (ret)
return ret;
- ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_write,
+ ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_write,
stfsm_s25fl_write4_configs);
if (ret)
return ret;
@@ -1405,7 +1405,7 @@ static int stfsm_s25fl_config(struct stfsm *fsm)
}
/* Check status of 'QE' bit */
- data_pads = ((stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1;
+ data_pads = ((fsm->stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1;
stfsm_read_status(fsm, FLASH_CMD_RDSR2, &cr1);
if (data_pads == 4) {
if (!(cr1 & STFSM_S25FL_CONFIG_QE)) {
@@ -1455,7 +1455,7 @@ static int stfsm_w25q_config(struct stfsm *fsm)
return ret;
/* If using QUAD mode, set QE STATUS bit */
- data_pads = ((stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1;
+ data_pads = ((fsm->stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1;
if (data_pads == 4) {
stfsm_read_status(fsm, FLASH_CMD_RDSR, &sta1);
stfsm_read_status(fsm, FLASH_CMD_RDSR2, &sta2);
@@ -1475,7 +1475,7 @@ static int stfsm_w25q_config(struct stfsm *fsm)
static int stfsm_read(struct stfsm *fsm, uint8_t *buf, uint32_t size,
uint32_t offset)
{
- struct stfsm_seq *seq = &stfsm_seq_read;
+ struct stfsm_seq *seq = &fsm->stfsm_seq_read;
uint32_t data_pads;
uint32_t read_mask;
uint32_t size_ub;
@@ -1536,7 +1536,7 @@ static int stfsm_read(struct stfsm *fsm, uint8_t *buf, uint32_t size,
static int stfsm_write(struct stfsm *fsm, const uint8_t *const buf,
const uint32_t size, const uint32_t offset)
{
- struct stfsm_seq *seq = &stfsm_seq_write;
+ struct stfsm_seq *seq = &fsm->stfsm_seq_write;
uint32_t data_pads;
uint32_t write_mask;
uint32_t size_ub;
--
1.8.3.2
--
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