diff options
Diffstat (limited to 'target/linux/brcm63xx/patches-3.18/345-MIPS-BCM63XX-fixup-mapped-SPI-flash-access-on-boot.patch')
| -rw-r--r-- | target/linux/brcm63xx/patches-3.18/345-MIPS-BCM63XX-fixup-mapped-SPI-flash-access-on-boot.patch | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/patches-3.18/345-MIPS-BCM63XX-fixup-mapped-SPI-flash-access-on-boot.patch b/target/linux/brcm63xx/patches-3.18/345-MIPS-BCM63XX-fixup-mapped-SPI-flash-access-on-boot.patch new file mode 100644 index 0000000000..2b19600776 --- /dev/null +++ b/target/linux/brcm63xx/patches-3.18/345-MIPS-BCM63XX-fixup-mapped-SPI-flash-access-on-boot.patch @@ -0,0 +1,63 @@ +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 | 36 ++++++++++++++++++++++++++++++++++++ + 1 file changed, 36 insertions(+) + +--- a/arch/mips/bcm63xx/dev-flash.c ++++ b/arch/mips/bcm63xx/dev-flash.c +@@ -110,9 +110,46 @@ 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_MB_EN (1 << 23) ++ + void __init bcm63xx_flash_detect(void) + { + flash_type = bcm63xx_detect_flash_type(); ++ ++ /* reduce flash mapping to single i/o reads for safety */ ++ 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)) ++ return; ++ ++ val &= ~FLASH_CTRL_MB_EN; ++ val &= ~FLASH_CTRL_READ_OPCODE_MASK; ++ ++ switch (val & FLASH_CTRL_ADDR_BYTES_MASK) { ++ case FLASH_CTRL_ADDR_BYTES_3: ++ val |= 0x0b; /* OPCODE_FAST_READ */ ++ break; ++ case FLASH_CTRL_ADDR_BYTES_4: ++ val |= 0x0c; /* OPCODE_FAST_READ_4B */ ++ 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; ++ } ++ ++ bcm_rset_writel(RSET_HSSPI, val, HSSPI_FLASH_CTRL_REG); ++ } + } + + int __init bcm63xx_flash_register(void) |