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authorAlvinZhou <alvinzhou@mxic.com.tw>2024-09-26 22:19:51 +0800
committerTudor Ambarus <tudor.ambarus@linaro.org>2024-10-02 10:22:49 +0300
commitccac858d2bdb4f6eb97e903744d94f52046e742a (patch)
treeed7b88585c3440a0b5687d71ae953d939f69d6a6 /drivers/mtd/spi-nor
parent50cb86f21ec2ede08d0ec0479fbd8697a8a25616 (diff)
mtd: spi-nor: add Octal DTR support for Macronix flash
Create Macronix specify method for enable Octal DTR mode and set 20 dummy cycles to allow running at the maximum supported frequency for Macronix Octal flash. Use number of dummy cycles which is parse by SFDP then convert it to bit pattern and set in CR2 register. Set CR2 register for enable octal DTR mode. Use Read ID to confirm that enabling/disabling octal DTR mode was successful. Macronix ID format is A-A-B-B-C-C in octal DTR mode. To ensure the successful enablement of octal DTR mode, confirm that the 6-byte data is entirely correct. Co-developed-by: Tudor Ambarus <tudor.ambarus@linaro.org> Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org> Signed-off-by: JaimeLiao <jaimeliao@mxic.com.tw> Signed-off-by: AlvinZhou <alvinzhou@mxic.com.tw> Link: https://lore.kernel.org/r/20240926141956.2386374-2-alvinzhou.tw@gmail.com
Diffstat (limited to 'drivers/mtd/spi-nor')
-rw-r--r--drivers/mtd/spi-nor/macronix.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/macronix.c b/drivers/mtd/spi-nor/macronix.c
index ea6be95e75a5..1ccac899fcb5 100644
--- a/drivers/mtd/spi-nor/macronix.c
+++ b/drivers/mtd/spi-nor/macronix.c
@@ -8,6 +8,23 @@
#include "core.h"
+#define MXIC_NOR_OP_RD_CR2 0x71 /* Read configuration register 2 opcode */
+#define MXIC_NOR_OP_WR_CR2 0x72 /* Write configuration register 2 opcode */
+#define MXIC_NOR_ADDR_CR2_MODE 0x00000000 /* CR2 address for setting spi/sopi/dopi mode */
+#define MXIC_NOR_ADDR_CR2_DC 0x00000300 /* CR2 address for setting dummy cycles */
+#define MXIC_NOR_REG_DOPI_EN 0x2 /* Enable Octal DTR */
+#define MXIC_NOR_REG_SPI_EN 0x0 /* Enable SPI */
+
+/* Convert dummy cycles to bit pattern */
+#define MXIC_NOR_REG_DC(p) \
+ ((20 - (p)) >> 1)
+
+#define MXIC_NOR_WR_CR2(addr, ndata, buf) \
+ SPI_MEM_OP(SPI_MEM_OP_CMD(MXIC_NOR_OP_WR_CR2, 0), \
+ SPI_MEM_OP_ADDR(4, addr, 0), \
+ SPI_MEM_OP_NO_DUMMY, \
+ SPI_MEM_OP_DATA_OUT(ndata, buf, 0))
+
static int
mx25l25635_post_bfpt_fixups(struct spi_nor *nor,
const struct sfdp_parameter_header *bfpt_header,
@@ -185,6 +202,78 @@ static const struct flash_info macronix_nor_parts[] = {
}
};
+static int macronix_nor_octal_dtr_en(struct spi_nor *nor)
+{
+ struct spi_mem_op op;
+ u8 *buf = nor->bouncebuf, i;
+ int ret;
+
+ /* Use dummy cycles which is parse by SFDP and convert to bit pattern. */
+ buf[0] = MXIC_NOR_REG_DC(nor->params->reads[SNOR_CMD_READ_8_8_8_DTR].num_wait_states);
+ op = (struct spi_mem_op)MXIC_NOR_WR_CR2(MXIC_NOR_ADDR_CR2_DC, 1, buf);
+ ret = spi_nor_write_any_volatile_reg(nor, &op, nor->reg_proto);
+ if (ret)
+ return ret;
+
+ /* Set the octal and DTR enable bits. */
+ buf[0] = MXIC_NOR_REG_DOPI_EN;
+ op = (struct spi_mem_op)MXIC_NOR_WR_CR2(MXIC_NOR_ADDR_CR2_MODE, 1, buf);
+ ret = spi_nor_write_any_volatile_reg(nor, &op, nor->reg_proto);
+ if (ret)
+ return ret;
+
+ /* Read flash ID to make sure the switch was successful. */
+ ret = spi_nor_read_id(nor, 4, 4, buf, SNOR_PROTO_8_8_8_DTR);
+ if (ret) {
+ dev_dbg(nor->dev, "error %d reading JEDEC ID after enabling 8D-8D-8D mode\n", ret);
+ return ret;
+ }
+
+ /* Macronix SPI-NOR flash 8D-8D-8D read ID would get 6 bytes data A-A-B-B-C-C */
+ for (i = 0; i < nor->info->id->len; i++)
+ if (buf[i * 2] != buf[(i * 2) + 1] || buf[i * 2] != nor->info->id->bytes[i])
+ return -EINVAL;
+
+ return 0;
+}
+
+static int macronix_nor_octal_dtr_dis(struct spi_nor *nor)
+{
+ struct spi_mem_op op;
+ u8 *buf = nor->bouncebuf;
+ int ret;
+
+ /*
+ * The register is 1-byte wide, but 1-byte transactions are not
+ * allowed in 8D-8D-8D mode. Since there is no register at the
+ * next location, just initialize the value to 0 and let the
+ * transaction go on.
+ */
+ buf[0] = MXIC_NOR_REG_SPI_EN;
+ buf[1] = 0x0;
+ op = (struct spi_mem_op)MXIC_NOR_WR_CR2(MXIC_NOR_ADDR_CR2_MODE, 2, buf);
+ ret = spi_nor_write_any_volatile_reg(nor, &op, SNOR_PROTO_8_8_8_DTR);
+ if (ret)
+ return ret;
+
+ /* Read flash ID to make sure the switch was successful. */
+ ret = spi_nor_read_id(nor, 0, 0, buf, SNOR_PROTO_1_1_1);
+ if (ret) {
+ dev_dbg(nor->dev, "error %d reading JEDEC ID after disabling 8D-8D-8D mode\n", ret);
+ return ret;
+ }
+
+ if (memcmp(buf, nor->info->id->bytes, nor->info->id->len))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int macronix_nor_set_octal_dtr(struct spi_nor *nor, bool enable)
+{
+ return enable ? macronix_nor_octal_dtr_en(nor) : macronix_nor_octal_dtr_dis(nor);
+}
+
static void macronix_nor_default_init(struct spi_nor *nor)
{
nor->params->quad_enable = spi_nor_sr1_bit6_quad_enable;
@@ -194,6 +283,7 @@ static int macronix_nor_late_init(struct spi_nor *nor)
{
if (!nor->params->set_4byte_addr_mode)
nor->params->set_4byte_addr_mode = spi_nor_set_4byte_addr_mode_en4b_ex4b;
+ nor->params->set_octal_dtr = macronix_nor_set_octal_dtr;
return 0;
}