[PATCH 19/35] mtd: st_spi_fsm: Provide a method to put the chip into 32bit addressing mode
From: Lee Jones <hidden>
Date: 2014-02-18 14:57:27
Also in:
lkml
Subsystem:
memory technology devices (mtd), the rest · Maintainers:
Miquel Raynal, Richard Weinberger, Vignesh Raghavendra, Linus Torvalds
Most Serial Flash chips support 24bit addressing as a default but more recent incarnations can support 32bit. Based on information provided though platform specific data and capabilities we can determine whether or not our current chip can. This patch provides a means to setup the FSM message sequence to put the chip into 32bit mode. Acked-by Angus Clark [off-list ref] Signed-off-by: Lee Jones <redacted> --- drivers/mtd/devices/st_spi_fsm.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
index b9e7061..e20f4cb 100644
--- a/drivers/mtd/devices/st_spi_fsm.c
+++ b/drivers/mtd/devices/st_spi_fsm.c@@ -375,6 +375,8 @@ static struct flash_info flash_types[] = { { NULL, 0x000000, 0, 0, 0, 0, 0, NULL }, }; +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 |
@@ -523,6 +525,23 @@ static void stfsm_read_fifo(struct stfsm *fsm, uint32_t *buf, } } +static int stfsm_enter_32bit_addr(struct stfsm *fsm, int enter) +{ + struct stfsm_seq *seq = &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 | + SEQ_OPC_CYCLES(8) | + SEQ_OPC_OPCODE(cmd) | + SEQ_OPC_CSDEASSERT); + + stfsm_load_seq(fsm, seq); + + stfsm_wait_seq(fsm); + + return 0; +} + /* * SoC reset on 'boot-from-spi' systems *
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