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mtd: st_spi_fsm: Provide the erase one sector sequence 

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.

Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Lee Jones 2014-03-20 09:20:47 +00:00 committed by Brian Norris
parent a63984c18a
commit fa5ba3af20
1 changed files with 35 additions and 0 deletions
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35
drivers/mtd/devices/st_spi_fsm.c
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@ -389,6 +389,28 @@ 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;
@ -477,6 +499,19 @@ 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,