[PATCH v3 16/36] mtd: st_spi_fsm: Provide the erase one sector sequence

Lee Jones
2013-11-29T12:20:10Z

The FSM Serial Flash Controller is driven by issuing a standard set of
register writes we call a message sequence. This patch supplies a method
to prepare the message sequence responsible for erasing a single sector.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
drivers/mtd/devices/st_spi_fsm.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)

diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
index bb642a1..47f9da0 100644
--- a/drivers/mtd/devices/st_spi_fsm.c
+++ b/drivers/mtd/devices/st_spi_fsm.c
@@ -44,6 +44,28 @@ static struct stfsm_seq stfsm_seq_read_jedec = {
SEQ_CFG_STARTSEQ),
};

+static struct stfsm_seq stfsm_seq_erase_sector = {
+ /* 'addr_cfg' configured during initialisation */
+ .seq_opc = {
+ (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) |
+ SEQ_OPC_OPCODE(FLASH_CMD_WREN) | SEQ_OPC_CSDEASSERT),
+
+ (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) |
+ SEQ_OPC_OPCODE(FLASH_CMD_SE)),
+ },
+ .seq = {
+ STFSM_INST_CMD1,
+ STFSM_INST_CMD2,
+ STFSM_INST_ADD1,
+ STFSM_INST_ADD2,
+ STFSM_INST_STOP,
+ },
+ .seq_cfg = (SEQ_CFG_PADS_1 |
+ SEQ_CFG_READNOTWRITE |
+ SEQ_CFG_CSDEASSERT |
+ SEQ_CFG_STARTSEQ),
+};
+
static inline int stfsm_is_idle(struct stfsm *fsm)
{
return readl(fsm->base + SPI_FAST_SEQ_STA) & 0x10;
@@ -126,6 +148,19 @@ static void stfsm_read_fifo(struct stfsm *fsm, uint32_t *buf,
}
}

+/* Configure 'addr_cfg' according to addressing mode */
+static void stfsm_prepare_erasesec_seq(struct stfsm *fsm,
+ struct stfsm_seq *seq)
+{
+ int addr1_cycles = fsm->info->flags & FLASH_FLAG_32BIT_ADDR ? 16 : 8;
+
+ seq->addr_cfg = (ADR_CFG_CYCLES_ADD1(addr1_cycles) |
+ ADR_CFG_PADS_1_ADD1 |
+ ADR_CFG_CYCLES_ADD2(16) |
+ ADR_CFG_PADS_1_ADD2 |
+ ADR_CFG_CSDEASSERT_ADD2);
+}
+
/* Search for preferred configuration based on available flags */
static struct seq_rw_config *
stfsm_search_seq_rw_configs(struct stfsm *fsm,
--
1.8.3.2