lkml.org 
[lkml]   [2013]   [Nov]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v3 16/36] mtd: st_spi_fsm: Provide the erase one sector sequence
    Date
    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.

    Signed-off-by: Lee Jones <lee.jones@linaro.org>
    ---
    drivers/mtd/devices/st_spi_fsm.c | 35 +++++++++++++++++++++++++++++++++++
    1 file changed, 35 insertions(+)

    diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
    index bb642a1..47f9da0 100644
    --- a/drivers/mtd/devices/st_spi_fsm.c
    +++ b/drivers/mtd/devices/st_spi_fsm.c
    @@ -44,6 +44,28 @@ 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;
    @@ -126,6 +148,19 @@ 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,
    --
    1.8.3.2


    \
     
     \ /
      Last update: 2013-11-29 14:01    [W:4.686 / U:0.120 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site