[PATCH v2 4/5] mtd: spi-nor: macronix: Add Octal 8D-8D-8D supports for Macronix mx25uw51245g

[Mason Yang]

Macronix mx25uw51245g is a SPI NOR that supports 1-1-1/8-8-8 mode and
JEDEC216D spec. included BFPT DWORD-18,19, 20 and xSPI profile 1.0 table.

Correct the dummy cycles for various frequency after xSPI 1.0 table parsed.

Enable mx25uw51245g to Octal 8D-8D-8D mode by writing CFG Reg2 in the
late initialization of default flash parameters spi_nor_late_init_params();

Signed-off-by: Mason Yang <masonccyang@xxxxxxxxxxx>
---
 drivers/mtd/spi-nor/macronix.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/drivers/mtd/spi-nor/macronix.c b/drivers/mtd/spi-nor/macronix.c
index ab0f963..46bcfe5 100644
--- a/drivers/mtd/spi-nor/macronix.c
+++ b/drivers/mtd/spi-nor/macronix.c
@@ -8,6 +8,43 @@
 
 #include "core.h"
 
+#define MXIC_CR2_DUMMY_SET_ADDR 0x300
+
+/* Fixup the dummy cycles after SFDP xSPI 1.0 parsed */
+static void mx25uw51245g_post_sfdp_fixups(struct spi_nor *nor)
+{
+	struct spi_nor_flash_parameter *params = nor->params;
+	int ret;
+	u8 rdc, wdc;
+
+	ret = spi_nor_read_cr2(nor, MXIC_CR2_DUMMY_SET_ADDR, &rdc);
+	if (ret)
+		return;
+
+	/* Refer to dummy cycle and frequency table(MHz) */
+	switch (params->dummy_cycles) {
+	case 10:	/* 10 dummy cycles for 104 MHz */
+		wdc = 5;
+		break;
+	case 12:	/* 12 dummy cycles for 133 MHz */
+		wdc = 4;
+		break;
+	case 16:	/* 16 dummy cycles for 166 MHz */
+		wdc = 2;
+		break;
+	case 20:	/* 20 dummy cycles for 200 MHz */
+	default:
+		wdc = 0;
+	}
+
+	if (rdc != wdc)
+		spi_nor_write_cr2(nor, MXIC_CR2_DUMMY_SET_ADDR, &wdc);
+}
+
+static struct spi_nor_fixups mx25uw51245g_fixups = {
+	.post_sfdp = mx25uw51245g_post_sfdp_fixups,
+};
+
 static int
 mx25l25635_post_bfpt_fixups(struct spi_nor *nor,
 			    const struct sfdp_parameter_header *bfpt_header,
@@ -78,6 +115,10 @@
 			      SPI_NOR_QUAD_READ) },
 	{ "mx66l1g55g",  INFO(0xc2261b, 0, 64 * 1024, 2048,
 			      SPI_NOR_QUAD_READ) },
+	{ "mx25uw51245g",  INFO(0xc2813a, 0, 64 * 1024, 1024,
+				SECT_4K | SPI_NOR_4B_OPCODES |
+				SPI_NOR_OCTAL_RD_WR)
+				.fixups = &mx25uw51245g_fixups },
 };
 
 static void macronix_default_init(struct spi_nor *nor)
-- 
1.9.1