From: Lee Jones Date: Thu, 20 Mar 2014 09:20:48 +0000 (+0000) Subject: mtd: st_spi_fsm: Provide the sequence for enabling 32bit addressing mode X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=6bd2960080bc5842159d89a8d476a9044225788c;p=deliverable%2Flinux.git mtd: st_spi_fsm: Provide the sequence for enabling 32bit addressing mode 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. Acked-by Angus Clark Signed-off-by: Lee Jones Signed-off-by: Brian Norris --- diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c index 06e6a5282044..9d1edf05701a 100644 --- a/drivers/mtd/devices/st_spi_fsm.c +++ b/drivers/mtd/devices/st_spi_fsm.c @@ -411,6 +411,28 @@ static struct stfsm_seq stfsm_seq_erase_sector = { SEQ_CFG_STARTSEQ), }; +static int stfsm_n25q_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;