b2c68ceea7
Newer batches of several Mikrotik boards contain this yet-unsupported flash chip, for instance: - rb941-2nd (hAP lite) - rb952ui-5ac2nd (hAP ac lite) - RBM33G and probably other Mikrotik boards need this patch as well. The patch was submitted upstream by Robert Marko: https://patchwork.ozlabs.org/patch/934181/ Closes: FS#1715 Signed-off-by: Baptiste Jonglez <git@bitsofnetworks.org> Cc: Robert Marko <robimarko@gmail.com>
73 lines
2.3 KiB
Diff
73 lines
2.3 KiB
Diff
--- a/drivers/mtd/spi-nor/spi-nor.c
|
|
+++ b/drivers/mtd/spi-nor/spi-nor.c
|
|
@@ -142,20 +142,29 @@ static int read_fsr(struct spi_nor *nor)
|
|
* location. Return the configuration register value.
|
|
* Returns negative if error occurred.
|
|
*/
|
|
-static int read_cr(struct spi_nor *nor)
|
|
+static int _read_cr(struct spi_nor *nor, u8 reg)
|
|
{
|
|
int ret;
|
|
u8 val;
|
|
|
|
- ret = nor->read_reg(nor, SPINOR_OP_RDCR, &val, 1);
|
|
+ ret = nor->read_reg(nor, reg, &val, 1);
|
|
if (ret < 0) {
|
|
- dev_err(nor->dev, "error %d reading CR\n", ret);
|
|
+ dev_err(nor->dev, "error %d reading %s\n", ret,
|
|
+ (reg==SPINOR_OP_RDCR)?"CR":"XCR");
|
|
return ret;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
+static inline int read_cr(struct spi_nor *nor) {
|
|
+ return _read_cr(nor, SPINOR_OP_RDCR);
|
|
+}
|
|
+
|
|
+static inline int read_xcr(struct spi_nor *nor) {
|
|
+ return _read_cr(nor, SPINOR_OP_RDXCR);
|
|
+}
|
|
+
|
|
/*
|
|
* Write status register 1 byte
|
|
* Returns negative if error occurred.
|
|
@@ -2883,9 +2892,16 @@ int spi_nor_scan(struct spi_nor *nor, co
|
|
} else if (mtd->size > 0x1000000) {
|
|
/* enable 4-byte addressing if the device exceeds 16MiB */
|
|
nor->addr_width = 4;
|
|
- if (info->flags & SPI_NOR_4B_READ_OP)
|
|
- spi_nor_set_4byte_read(nor, info);
|
|
- else if (JEDEC_MFR(info) == SNOR_MFR_SPANSION ||
|
|
+ if (info->flags & SPI_NOR_4B_READ_OP) {
|
|
+ if (JEDEC_MFR(info) == SNOR_MFR_WINBOND) {
|
|
+ ret = read_xcr(nor);
|
|
+ if (!(ret > 0 && (ret & XCR_DEF_4B_ADDR_MODE)))
|
|
+ spi_nor_set_4byte_read(nor, info);
|
|
+ else
|
|
+ set_4byte(nor, info, 1);
|
|
+ } else
|
|
+ spi_nor_set_4byte_read(nor, info);
|
|
+ } else if (JEDEC_MFR(info) == SNOR_MFR_SPANSION ||
|
|
info->flags & SPI_NOR_4B_OPCODES)
|
|
spi_nor_set_4byte_opcodes(nor, info);
|
|
else
|
|
--- a/include/linux/mtd/spi-nor.h
|
|
+++ b/include/linux/mtd/spi-nor.h
|
|
@@ -103,6 +103,7 @@
|
|
#define SPINOR_OP_EN4B 0xb7 /* Enter 4-byte mode */
|
|
#define SPINOR_OP_EX4B 0xe9 /* Exit 4-byte mode */
|
|
#define SPINOR_OP_WREAR 0xc5 /* Write extended address register */
|
|
+#define SPINOR_OP_RDXCR 0x15 /* Read extended configuration register */
|
|
|
|
/* Used for Spansion flashes only. */
|
|
#define SPINOR_OP_BRWR 0x17 /* Bank register write */
|
|
@@ -135,6 +136,7 @@
|
|
|
|
/* Configuration Register bits. */
|
|
#define CR_QUAD_EN_SPAN BIT(1) /* Spansion Quad I/O */
|
|
+#define XCR_DEF_4B_ADDR_MODE BIT(1) /* Winbond 4B mode default */
|
|
|
|
/* Status Register 2 bits. */
|
|
#define SR2_QUAD_EN_BIT7 BIT(7)
|