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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)
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