diff options
Diffstat (limited to 'target/linux/brcm63xx/patches-4.4/345-MIPS-BCM63XX-fixup-mapped-SPI-flash-access-on-boot.patch')
| -rw-r--r-- | target/linux/brcm63xx/patches-4.4/345-MIPS-BCM63XX-fixup-mapped-SPI-flash-access-on-boot.patch | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/patches-4.4/345-MIPS-BCM63XX-fixup-mapped-SPI-flash-access-on-boot.patch b/target/linux/brcm63xx/patches-4.4/345-MIPS-BCM63XX-fixup-mapped-SPI-flash-access-on-boot.patch new file mode 100644 index 0000000..c8bef13 --- /dev/null +++ b/target/linux/brcm63xx/patches-4.4/345-MIPS-BCM63XX-fixup-mapped-SPI-flash-access-on-boot.patch @@ -0,0 +1,84 @@ +From 1cacd0f7b0d35f8e3d3f8a69ecb3b5e436d6b9e8 Mon Sep 17 00:00:00 2001 +From: Jonas Gorski <jogo@openwrt.org> +Date: Sun, 22 Dec 2013 13:25:25 +0100 +Subject: [PATCH 52/56] MIPS: BCM63XX: fixup mapped SPI flash access on boot + +Some bootloaders leave the flash access in an invalid state with dual +read enabled; fix it by disabling it and falling back to simple fast +reads. + +Signed-off-by: Jonas Gorski <jogo@openwrt.org> +--- + arch/mips/bcm63xx/dev-flash.c | 51 ++++++++++++++++++++++++++++++++++++ + 1 file changed, 51 insertions(+) + +--- a/arch/mips/bcm63xx/dev-flash.c ++++ b/arch/mips/bcm63xx/dev-flash.c +@@ -16,6 +16,7 @@ + #include <linux/mtd/mtd.h> + #include <linux/mtd/partitions.h> + #include <linux/mtd/physmap.h> ++#include <linux/mtd/spi-nor.h> + + #include <bcm63xx_cpu.h> + #include <bcm63xx_dev_flash.h> +@@ -110,9 +111,59 @@ static int __init bcm63xx_detect_flash_t + } + } + ++#define HSSPI_FLASH_CTRL_REG 0x14 ++#define FLASH_CTRL_READ_OPCODE_MASK 0xff ++#define FLASH_CTRL_ADDR_BYTES_MASK (0x3 << 8) ++#define FLASH_CTRL_ADDR_BYTES_2 (0 << 8) ++#define FLASH_CTRL_ADDR_BYTES_3 (1 << 8) ++#define FLASH_CTRL_ADDR_BYTES_4 (2 << 8) ++#define FLASH_CTRL_DUMMY_BYTES_SHIFT 10 ++#define FLASH_CTRL_DUMMY_BYTES_MASK (0x3 << FLASH_CTRL_DUMMY_BYTES_SHIFT) ++#define FLASH_CTRL_MB_EN (1 << 23) ++ + void __init bcm63xx_flash_detect(void) + { + flash_type = bcm63xx_detect_flash_type(); ++ ++ /* ensure flash mapping has sane values */ ++ if (flash_type == BCM63XX_FLASH_TYPE_SERIAL && ++ (BCMCPU_IS_6318() || BCMCPU_IS_6328() || BCMCPU_IS_6362() || ++ BCMCPU_IS_63268())) { ++ u32 val = bcm_rset_readl(RSET_HSSPI, HSSPI_FLASH_CTRL_REG); ++ ++ if (val & FLASH_CTRL_MB_EN) { ++ /* cfe might configure non working dual-io mode */ ++ val &= ~FLASH_CTRL_MB_EN; ++ val &= ~FLASH_CTRL_READ_OPCODE_MASK; ++ val &= ~FLASH_CTRL_DUMMY_BYTES_MASK; ++ val |= 1 << FLASH_CTRL_DUMMY_BYTES_SHIFT; ++ ++ switch (val & FLASH_CTRL_ADDR_BYTES_MASK) { ++ case FLASH_CTRL_ADDR_BYTES_3: ++ val |= SPINOR_OP_READ_FAST; ++ break; ++ case FLASH_CTRL_ADDR_BYTES_4: ++ val |= SPINOR_OP_READ4_FAST; ++ break; ++ case FLASH_CTRL_ADDR_BYTES_2: ++ default: ++ pr_warn("unsupported address byte mode (%x), not fixing up\n", ++ val & FLASH_CTRL_ADDR_BYTES_MASK); ++ return; ++ } ++ } else { ++ /* ensure dummy bytes is set to 1 for _FAST reads */ ++ u8 cmd = val & FLASH_CTRL_READ_OPCODE_MASK; ++ ++ if (cmd != SPINOR_OP_READ_FAST && cmd != SPINOR_OP_READ4_FAST) ++ return; ++ ++ val &= ~FLASH_CTRL_DUMMY_BYTES_MASK; ++ val |= 1 << FLASH_CTRL_DUMMY_BYTES_SHIFT; ++ } ++ ++ bcm_rset_writel(RSET_HSSPI, val, HSSPI_FLASH_CTRL_REG); ++ } + } + + int __init bcm63xx_flash_register(void) |