mtd: st_spi_fsm: Update the flash Volatile Configuration Register

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 updating a chip's VCR.

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>

diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
index 0a5b70290b1bef9549b960d91ead770f5bb3d01b..5683443e7261672d82242b454a89bf4b6b23deca 100644 (file)
--- a/drivers/mtd/devices/st_spi_fsm.c
+++ b/drivers/mtd/devices/st_spi_fsm.c
@@ -415,6 +415,23 @@ static struct stfsm_seq stfsm_seq_erase_sector = {
                    SEQ_CFG_STARTSEQ),
 };
 
+static struct stfsm_seq stfsm_seq_wrvcr = {
+       .seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) |
+                      SEQ_OPC_OPCODE(FLASH_CMD_WREN) | SEQ_OPC_CSDEASSERT),
+       .seq_opc[1] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) |
+                      SEQ_OPC_OPCODE(FLASH_CMD_WRVCR)),
+       .seq = {
+               STFSM_INST_CMD1,
+               STFSM_INST_CMD2,
+               STFSM_INST_STA_WR1,
+               STFSM_INST_STOP,
+       },
+       .seq_cfg = (SEQ_CFG_PADS_1 |
+                   SEQ_CFG_READNOTWRITE |
+                   SEQ_CFG_CSDEASSERT |
+                   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) |
@@ -542,6 +559,21 @@ static int stfsm_enter_32bit_addr(struct stfsm *fsm, int enter)
        return 0;
 }
 
+static int stfsm_wrvcr(struct stfsm *fsm, uint8_t data)
+{
+       struct stfsm_seq *seq = &stfsm_seq_wrvcr;
+
+       dev_dbg(fsm->dev, "writing VCR 0x%02x\n", data);
+
+       seq->status = (STA_DATA_BYTE1(data) | STA_PADS_1 | STA_CSDEASSERT);
+
+       stfsm_load_seq(fsm, seq);
+
+       stfsm_wait_seq(fsm);
+
+       return 0;
+}
+
 /*
  * SoC reset on 'boot-from-spi' systems
  *