diff options
| -rw-r--r-- | drivers/mtd/devices/st_spi_fsm.c | 152 |
1 files changed, 68 insertions, 84 deletions
diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c index f86d3e01433b..ced73b13f46b 100644 --- a/drivers/mtd/devices/st_spi_fsm.c +++ b/drivers/mtd/devices/st_spi_fsm.c @@ -212,8 +212,6 @@ #define FLASH_CMD_SE_32K 0x52 #define FLASH_CMD_SE 0xd8 #define FLASH_CMD_CHIPERASE 0xc7 -#define FLASH_CMD_WRVCR 0x81 -#define FLASH_CMD_RDVCR 0x85 #define FLASH_CMD_READ 0x03 /* READ */ #define FLASH_CMD_READ_FAST 0x0b /* FAST READ */ @@ -261,6 +259,12 @@ #define S25FL_STATUS_E_ERR 0x20 #define S25FL_STATUS_P_ERR 0x40 +#define N25Q_CMD_WRVCR 0x81 +#define N25Q_CMD_RDVCR 0x85 +#define N25Q_CMD_RDVECR 0x65 +#define N25Q_CMD_RDNVCR 0xb5 +#define N25Q_CMD_WRNVCR 0xb1 + #define FLASH_PAGESIZE 256 /* In Bytes */ #define FLASH_PAGESIZE_32 (FLASH_PAGESIZE / 4) /* In uint32_t */ #define FLASH_MAX_BUSY_WAIT (300 * HZ) /* Maximum 'CHIPERASE' time */ @@ -592,7 +596,7 @@ static struct seq_rw_config stfsm_s25fl_write4_configs[] = { /* * [W25Qxxx] Configuration */ -#define W25Q_STATUS_QE (0x1 << 9) +#define W25Q_STATUS_QE (0x1 << 1) static struct stfsm_seq stfsm_seq_read_jedec = { .data_size = TRANSFER_SIZE(8), @@ -686,23 +690,6 @@ static struct stfsm_seq stfsm_seq_write_status = { 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) | @@ -891,60 +878,57 @@ static uint8_t stfsm_wait_busy(struct stfsm *fsm) } static int stfsm_read_status(struct stfsm *fsm, uint8_t cmd, - uint8_t *status) + uint8_t *data, int bytes) { struct stfsm_seq *seq = &stfsm_seq_read_status_fifo; uint32_t tmp; + uint8_t *t = (uint8_t *)&tmp; + int i; - dev_dbg(fsm->dev, "reading STA[%s]\n", - (cmd == FLASH_CMD_RDSR) ? "1" : "2"); + dev_dbg(fsm->dev, "read 'status' register [0x%02x], %d byte(s)\n", + cmd, bytes); - seq->seq_opc[0] = (SEQ_OPC_PADS_1 | - SEQ_OPC_CYCLES(8) | + BUG_ON(bytes != 1 && bytes != 2); + + seq->seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(cmd)), stfsm_load_seq(fsm, seq); stfsm_read_fifo(fsm, &tmp, 4); - *status = (uint8_t)(tmp >> 24); + for (i = 0; i < bytes; i++) + data[i] = t[i]; stfsm_wait_seq(fsm); return 0; } -static int stfsm_write_status(struct stfsm *fsm, uint16_t status, - int sta_bytes) +static int stfsm_write_status(struct stfsm *fsm, uint8_t cmd, + uint16_t data, int bytes, int wait_busy) { struct stfsm_seq *seq = &stfsm_seq_write_status; - dev_dbg(fsm->dev, "writing STA[%s] 0x%04x\n", - (sta_bytes == 1) ? "1" : "1+2", status); - - seq->status = (uint32_t)status | STA_PADS_1 | STA_CSDEASSERT; - seq->seq[2] = (sta_bytes == 1) ? - STFSM_INST_STA_WR1 : STFSM_INST_STA_WR1_2; - - stfsm_load_seq(fsm, seq); - - stfsm_wait_seq(fsm); - - return 0; -}; + dev_dbg(fsm->dev, + "write 'status' register [0x%02x], %d byte(s), 0x%04x\n" + " %s wait-busy\n", cmd, bytes, data, wait_busy ? "with" : "no"); -static int stfsm_wrvcr(struct stfsm *fsm, uint8_t data) -{ - struct stfsm_seq *seq = &stfsm_seq_wrvcr; + BUG_ON(bytes != 1 && bytes != 2); - dev_dbg(fsm->dev, "writing VCR 0x%02x\n", data); + seq->seq_opc[1] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | + SEQ_OPC_OPCODE(cmd)); - seq->status = (STA_DATA_BYTE1(data) | STA_PADS_1 | STA_CSDEASSERT); + seq->status = (uint32_t)data | STA_PADS_1 | STA_CSDEASSERT; + seq->seq[2] = (bytes == 1) ? STFSM_INST_STA_WR1 : STFSM_INST_STA_WR1_2; stfsm_load_seq(fsm, seq); stfsm_wait_seq(fsm); + if (wait_busy) + stfsm_wait_busy(fsm); + return 0; } @@ -1164,26 +1148,22 @@ static int stfsm_mx25_config(struct stfsm *fsm) CFG_ERASESEC_TOGGLE_32BIT_ADDR); } - /* Check status of 'QE' bit */ - stfsm_read_status(fsm, FLASH_CMD_RDSR, &sta); + /* Check status of 'QE' bit, update if required. */ + stfsm_read_status(fsm, FLASH_CMD_RDSR, &sta, 1); data_pads = ((fsm->stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1; if (data_pads == 4) { if (!(sta & MX25_STATUS_QE)) { /* Set 'QE' */ sta |= MX25_STATUS_QE; - stfsm_write_status(fsm, sta, 1); - - stfsm_wait_busy(fsm); + stfsm_write_status(fsm, FLASH_CMD_WRSR, sta, 1, 1); } } else { if (sta & MX25_STATUS_QE) { /* Clear 'QE' */ sta &= ~MX25_STATUS_QE; - stfsm_write_status(fsm, sta, 1); - - stfsm_wait_busy(fsm); + stfsm_write_status(fsm, FLASH_CMD_WRSR, sta, 1, 1); } } @@ -1250,7 +1230,7 @@ static int stfsm_n25q_config(struct stfsm *fsm) */ vcr = (N25Q_VCR_DUMMY_CYCLES(8) | N25Q_VCR_XIP_DISABLED | N25Q_VCR_WRAP_CONT); - stfsm_wrvcr(fsm, vcr); + stfsm_write_status(fsm, N25Q_CMD_WRVCR, vcr, 1, 0); return 0; } @@ -1378,6 +1358,7 @@ static int stfsm_s25fl_config(struct stfsm *fsm) uint32_t offs; uint16_t sta_wr; uint8_t sr1, cr1, dyb; + int update_sr = 0; int ret; if (flags & FLASH_FLAG_32BIT_ADDR) { @@ -1425,34 +1406,28 @@ static int stfsm_s25fl_config(struct stfsm *fsm) } } - /* Check status of 'QE' bit */ + /* Check status of 'QE' bit, update if required. */ + stfsm_read_status(fsm, FLASH_CMD_RDSR2, &cr1, 1); data_pads = ((fsm->stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1; - stfsm_read_status(fsm, FLASH_CMD_RDSR2, &cr1); if (data_pads == 4) { if (!(cr1 & STFSM_S25FL_CONFIG_QE)) { /* Set 'QE' */ cr1 |= STFSM_S25FL_CONFIG_QE; - stfsm_read_status(fsm, FLASH_CMD_RDSR, &sr1); - sta_wr = ((uint16_t)cr1 << 8) | sr1; - - stfsm_write_status(fsm, sta_wr, 2); - - stfsm_wait_busy(fsm); + update_sr = 1; } } else { - if ((cr1 & STFSM_S25FL_CONFIG_QE)) { + if (cr1 & STFSM_S25FL_CONFIG_QE) { /* Clear 'QE' */ cr1 &= ~STFSM_S25FL_CONFIG_QE; - stfsm_read_status(fsm, FLASH_CMD_RDSR, &sr1); - sta_wr = ((uint16_t)cr1 << 8) | sr1; - - stfsm_write_status(fsm, sta_wr, 2); - - stfsm_wait_busy(fsm); + update_sr = 1; } - + } + if (update_sr) { + stfsm_read_status(fsm, FLASH_CMD_RDSR, &sr1, 1); + sta_wr = ((uint16_t)cr1 << 8) | sr1; + stfsm_write_status(fsm, FLASH_CMD_WRSR, sta_wr, 2, 1); } /* @@ -1467,27 +1442,36 @@ static int stfsm_s25fl_config(struct stfsm *fsm) static int stfsm_w25q_config(struct stfsm *fsm) { uint32_t data_pads; - uint16_t sta_wr; - uint8_t sta1, sta2; + uint8_t sr1, sr2; + uint16_t sr_wr; + int update_sr = 0; int ret; ret = stfsm_prepare_rwe_seqs_default(fsm); if (ret) return ret; - /* If using QUAD mode, set QE STATUS bit */ + /* Check status of 'QE' bit, update if required. */ + stfsm_read_status(fsm, FLASH_CMD_RDSR2, &sr2, 1); data_pads = ((fsm->stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1; if (data_pads == 4) { - stfsm_read_status(fsm, FLASH_CMD_RDSR, &sta1); - stfsm_read_status(fsm, FLASH_CMD_RDSR2, &sta2); - - sta_wr = ((uint16_t)sta2 << 8) | sta1; - - sta_wr |= W25Q_STATUS_QE; - - stfsm_write_status(fsm, sta_wr, 2); - - stfsm_wait_busy(fsm); + if (!(sr2 & W25Q_STATUS_QE)) { + /* Set 'QE' */ + sr2 |= W25Q_STATUS_QE; + update_sr = 1; + } + } else { + if (sr2 & W25Q_STATUS_QE) { + /* Clear 'QE' */ + sr2 &= ~W25Q_STATUS_QE; + update_sr = 1; + } + } + if (update_sr) { + /* Write status register */ + stfsm_read_status(fsm, FLASH_CMD_RDSR, &sr1, 1); + sr_wr = ((uint16_t)sr2 << 8) | sr1; + stfsm_write_status(fsm, FLASH_CMD_WRSR, sr_wr, 2, 1); } return 0; |