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Subject[RFC 19/47] mtd: nand: stm_nand_bch: configure BCH read/write/erase programs
Date
Tune BCH programs according to device found and ECC mode.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
drivers/mtd/nand/stm_nand_bch.c | 121 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 121 insertions(+)

diff --git a/drivers/mtd/nand/stm_nand_bch.c b/drivers/mtd/nand/stm_nand_bch.c
index 365a73b..351f5e2 100644
--- a/drivers/mtd/nand/stm_nand_bch.c
+++ b/drivers/mtd/nand/stm_nand_bch.c
@@ -97,6 +97,124 @@ struct nandi_controller {
struct nandi_info info; /* NAND device info */
};

+/* BCH 'program' structure */
+struct bch_prog {
+ u32 multi_cs_addr[3];
+ u32 multi_cs_config;
+ u8 seq[16];
+ u32 addr;
+ u32 extra;
+ u8 cmd[4];
+ u32 reserved1;
+ u32 gen_cfg;
+ u32 delay;
+ u32 reserved2;
+ u32 seq_cfg;
+};
+
+/* BCH template programs (modified on-the-fly) */
+static struct bch_prog bch_prog_read_page = {
+ .cmd = {
+ NAND_CMD_READ0,
+ NAND_CMD_READSTART,
+ },
+ .seq = {
+ BCH_ECC_SCORE(0),
+ BCH_CMD_ADDR,
+ BCH_CL_CMD_1,
+ BCH_DATA_2_SECTOR,
+ BCH_STOP,
+ },
+ .gen_cfg = (GEN_CFG_DATA_8_NOT_16 |
+ GEN_CFG_EXTRA_ADD_CYCLE |
+ GEN_CFG_LAST_SEQ_NODE),
+ .seq_cfg = SEQ_CFG_GO_STOP,
+};
+
+static struct bch_prog bch_prog_write_page = {
+ .cmd = {
+ NAND_CMD_SEQIN,
+ NAND_CMD_PAGEPROG,
+ NAND_CMD_STATUS,
+ },
+ .seq = {
+ BCH_CMD_ADDR,
+ BCH_DATA_4_SECTOR,
+ BCH_CL_CMD_1,
+ BCH_CL_CMD_2,
+ BCH_OP_ERR,
+ BCH_STOP,
+ },
+ .gen_cfg = (GEN_CFG_DATA_8_NOT_16 |
+ GEN_CFG_EXTRA_ADD_CYCLE |
+ GEN_CFG_LAST_SEQ_NODE),
+ .seq_cfg = (SEQ_CFG_GO_STOP |
+ SEQ_CFG_DATA_WRITE),
+};
+
+static struct bch_prog bch_prog_erase_block = {
+ .seq = {
+ BCH_CL_CMD_1,
+ BCH_AL_EX_0,
+ BCH_AL_EX_1,
+ BCH_AL_EX_2,
+ BCH_CL_CMD_2,
+ BCH_CL_CMD_3,
+ BCH_OP_ERR,
+ BCH_STOP,
+ },
+ .cmd = {
+ NAND_CMD_ERASE1,
+ NAND_CMD_ERASE1,
+ NAND_CMD_ERASE2,
+ NAND_CMD_STATUS,
+ },
+ .gen_cfg = (GEN_CFG_DATA_8_NOT_16 |
+ GEN_CFG_EXTRA_ADD_CYCLE |
+ GEN_CFG_LAST_SEQ_NODE),
+ .seq_cfg = (SEQ_CFG_GO_STOP |
+ SEQ_CFG_ERASE),
+};
+
+/* Configure BCH read/write/erase programs */
+static void bch_configure_progs(struct nandi_controller *nandi)
+{
+ uint8_t data_opa = ffs(nandi->sectors_per_page) - 1;
+ uint8_t data_instr = BCH_INSTR(BCH_OPC_DATA, data_opa);
+ uint32_t gen_cfg_ecc = nandi->bch_ecc_mode << GEN_CFG_ECC_SHIFT;
+
+ /* Set 'DATA' instruction */
+ bch_prog_read_page.seq[3] = data_instr;
+ bch_prog_write_page.seq[1] = data_instr;
+
+ /* Set ECC mode */
+ bch_prog_read_page.gen_cfg |= gen_cfg_ecc;
+ bch_prog_write_page.gen_cfg |= gen_cfg_ecc;
+ bch_prog_erase_block.gen_cfg |= gen_cfg_ecc;
+
+ /*
+ * Template sequences above are defined for devices that use 5 address
+ * cycles for page Read/Write operations (and 3 for Erase operations).
+ * Update sequences for devices that use 4 address cycles.
+ */
+ if (!nandi->extra_addr) {
+ /* Clear 'GEN_CFG_EXTRA_ADD_CYCLE' flag */
+ bch_prog_read_page.gen_cfg &= ~GEN_CFG_EXTRA_ADD_CYCLE;
+ bch_prog_write_page.gen_cfg &= ~GEN_CFG_EXTRA_ADD_CYCLE;
+ bch_prog_erase_block.gen_cfg &= ~GEN_CFG_EXTRA_ADD_CYCLE;
+
+ /* Configure Erase sequence for 2 address cycles */
+ /* (page address) */
+ bch_prog_erase_block.seq[0] = BCH_CL_CMD_1;
+ bch_prog_erase_block.seq[1] = BCH_AL_EX_0;
+ bch_prog_erase_block.seq[2] = BCH_AL_EX_1;
+ bch_prog_erase_block.seq[3] = BCH_CL_CMD_2;
+ bch_prog_erase_block.seq[4] = BCH_CL_CMD_3;
+ bch_prog_erase_block.seq[5] = BCH_OP_ERR;
+ bch_prog_erase_block.seq[6] = BCH_STOP;
+ }
+}
+
/*
* NANDi Interrupts (shared by Hamming and BCH controllers)
*/
@@ -869,6 +987,9 @@ static int stm_nand_bch_probe(struct platform_device *pdev)
return -EINVAL;
}

+ /* Tune BCH programs according to device found and ECC mode */
+ bch_configure_progs(nandi);
+
return 0;
}

--
1.8.3.2


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