@@ -565,6 +565,27 @@ static struct stfsm_seq stfsm_seq_erase_sector = {
SEQ_CFG_STARTSEQ),
};
+static struct stfsm_seq stfsm_seq_erase_chip = {
+ .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_CHIPERASE) | SEQ_OPC_CSDEASSERT),
+ },
+ .seq = {
+ STFSM_INST_CMD1,
+ STFSM_INST_CMD2,
+ STFSM_INST_WAIT,
+ STFSM_INST_STOP,
+ },
+ .seq_cfg = (SEQ_CFG_PADS_1 |
+ SEQ_CFG_ERASE |
+ SEQ_CFG_READNOTWRITE |
+ SEQ_CFG_CSDEASSERT |
+ 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),
@@ -1203,6 +1224,47 @@ static int stfsm_mtd_read(struct mtd_info *mtd, loff_t from, size_t len,
return 0;
}
+static int stfsm_erase_sector(struct stfsm *fsm, const uint32_t offset)
+{
+ struct stfsm_seq *seq = &stfsm_seq_erase_sector;
+ int ret;
+
+ dev_dbg(fsm->dev, "erasing sector at 0x%08x\n", offset);
+
+ /* Enter 32-bit address mode, if required */
+ if (fsm->configuration & CFG_ERASESEC_TOGGLE_32BIT_ADDR)
+ stfsm_enter_32bit_addr(fsm, 1);
+
+ seq->addr1 = (offset >> 16) & 0xffff;
+ seq->addr2 = offset & 0xffff;
+
+ stfsm_load_seq(fsm, seq);
+
+ stfsm_wait_seq(fsm);
+
+ /* Wait for completion */
+ ret = stfsm_wait_busy(fsm);
+
+ /* Exit 32-bit address mode, if required */
+ if (fsm->configuration & CFG_ERASESEC_TOGGLE_32BIT_ADDR)
+ stfsm_enter_32bit_addr(fsm, 0);
+
+ return ret;
+}
+
+static int stfsm_erase_chip(struct stfsm *fsm)
+{
+ const struct stfsm_seq *seq = &stfsm_seq_erase_chip;
+
+ dev_dbg(fsm->dev, "erasing chip\n");
+
+ stfsm_load_seq(fsm, seq);
+
+ stfsm_wait_seq(fsm);
+
+ return stfsm_wait_busy(fsm);
+}
+
/*
* Write an address range to the flash chip. Data must be written in
* FLASH_PAGESIZE chunks. The address range may be any size provided
@@ -1260,6 +1322,54 @@ out1:
return ret;
}
+/*
+ * Erase an address range on the flash chip. The address range may extend
+ * one or more erase sectors. Return an error is there is a problem erasing.
+ */
+static int stfsm_mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+ struct stfsm *fsm = dev_get_drvdata(mtd->dev.parent);
+ u32 addr, len;
+ int ret;
+
+ dev_dbg(fsm->dev, "%s at 0x%llx, len %lld\n", __func__,
+ (long long)instr->addr, (long long)instr->len);
+
+ addr = instr->addr;
+ len = instr->len;
+
+ mutex_lock(&fsm->lock);
+
+ /* Whole-chip erase? */
+ if (len == mtd->size) {
+ ret = stfsm_erase_chip(fsm);
+ if (ret)
+ goto out1;
+ } else {
+ while (len) {
+ ret = stfsm_erase_sector(fsm, addr);
+ if (ret)
+ goto out1;
+
+ addr += mtd->erasesize;
+ len -= mtd->erasesize;
+ }
+ }
+
+ mutex_unlock(&fsm->lock);
+
+ instr->state = MTD_ERASE_DONE;
+ mtd_erase_callback(instr);
+
+ return 0;
+
+out1:
+ instr->state = MTD_ERASE_FAILED;
+ mutex_unlock(&fsm->lock);
+
+ return ret;
+}
+
static void stfsm_read_jedec(struct stfsm *fsm, uint8_t *const jedec)
{
const struct stfsm_seq *seq = &stfsm_seq_read_jedec;
@@ -1530,8 +1640,9 @@ static int stfsm_probe(struct platform_device *pdev)
fsm->mtd._read = stfsm_mtd_read;
fsm->mtd._write = stfsm_mtd_write;
+ fsm->mtd._erase = stfsm_mtd_erase;
- dev_err(&pdev->dev,
+ dev_info(&pdev->dev,
"Found serial flash device: %s\n"
" size = %llx (%lldMiB) erasesize = 0x%08x (%uKiB)\n",
info->name,
When an erase is requested by userspace the MTD framework calls back into the driver to conduct the actual command issue. Here we provide the routines which do exactly that. We can choose to either do an entire chip erase or by sector. Signed-off-by: Lee Jones <lee.jones@linaro.org> --- drivers/mtd/devices/st_spi_fsm.c | 113 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 112 insertions(+), 1 deletion(-)