Messages in this thread Patch in this message | | | From | Lee Jones <> | Subject | [PATCH 17/23] mtd: st_spi_fsm: Provide the sequence for enabling 32bit addressing mode | Date | Fri, 22 Nov 2013 16:22:54 +0000 |
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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 setting 32bit addressing mode on the Flash chip.
Signed-off-by: Lee Jones <lee.jones@linaro.org> --- drivers/mtd/devices/st_spi_fsm.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c index 583a0ab..a56fb98 100644 --- a/drivers/mtd/devices/st_spi_fsm.c +++ b/drivers/mtd/devices/st_spi_fsm.c @@ -66,6 +66,28 @@ static struct stfsm_seq stfsm_seq_erase_sector = { SEQ_CFG_STARTSEQ), }; +static int stfsm_n25q_prepare_en_32bit_addr_seq(struct stfsm_seq *seq) +{ + seq->seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | + SEQ_OPC_OPCODE(FLASH_CMD_EN4B_ADDR)); + seq->seq_opc[1] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | + SEQ_OPC_OPCODE(FLASH_CMD_WREN) | + SEQ_OPC_CSDEASSERT); + + seq->seq[0] = STFSM_INST_CMD2; + seq->seq[1] = STFSM_INST_CMD1; + seq->seq[2] = STFSM_INST_WAIT; + seq->seq[3] = STFSM_INST_STOP; + + seq->seq_cfg = (SEQ_CFG_PADS_1 | + SEQ_CFG_ERASE | + SEQ_CFG_READNOTWRITE | + SEQ_CFG_CSDEASSERT | + SEQ_CFG_STARTSEQ); + + return 0; +} + static inline int stfsm_is_idle(struct stfsm *fsm) { return readl(fsm->base + SPI_FAST_SEQ_STA) & 0x10; -- 1.8.1.2
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