[U-Boot] [PATCH v2 4/4] mx53loco: Add CONFIG_REVISION_TAG

[Fabio Estevam]

FSL 2.6.35 kernel assumes that the bootloader passes the CONFIG_REVISION_TAG information.

The kernel uses this data to distinguish between Dialog versus mc34708 based boards,
and also to distinguish between revA and revB of the mc34708 based boards.

Suggested-by: Yu Li <yk at magniel.com>
Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
---
Changes since v1:
- Use proper io accessor for reading board revision

 arch/arm/include/asm/arch-mx5/imx-regs.h |    5 +++++
 board/freescale/mx53loco/mx53loco.c      |   12 ++++++++++++
 include/configs/mx53loco.h               |    1 +
 3 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/arch/arm/include/asm/arch-mx5/imx-regs.h b/arch/arm/include/asm/arch-mx5/imx-regs.h
index a4245a3..cef4190 100644
--- a/arch/arm/include/asm/arch-mx5/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx5/imx-regs.h
@@ -491,6 +491,11 @@ struct iim_regs {
 	} bank[4];
 };
 
+struct fuse_bank0_regs {
+	u32	fuse0_23[24];
+	u32	gp[8];
+};
+
 struct fuse_bank1_regs {
 	u32	fuse0_8[9];
 	u32	mac_addr[6];
diff --git a/board/freescale/mx53loco/mx53loco.c b/board/freescale/mx53loco/mx53loco.c
index 8c18b99..0dbde0c 100644
--- a/board/freescale/mx53loco/mx53loco.c
+++ b/board/freescale/mx53loco/mx53loco.c
@@ -62,6 +62,18 @@ void dram_init_banksize(void)
 	gd->bd->bi_dram[1].size = PHYS_SDRAM_2_SIZE;
 }
 
+u32 get_board_rev(void)
+{
+	struct iim_regs *iim = (struct iim_regs *)IMX_IIM_BASE;
+	struct fuse_bank *bank = &iim->bank[0];
+	struct fuse_bank0_regs *fuse =
+		(struct fuse_bank0_regs *)bank->fuse_regs;
+
+	int rev = readl(&fuse->gp[6]);
+
+	return (get_cpu_rev() & ~(0xF << 8)) | (rev & 0xF) << 8;
+}
+
 static void setup_iomux_uart(void)
 {
 	/* UART1 RXD */
diff --git a/include/configs/mx53loco.h b/include/configs/mx53loco.h
index 87f6ed1..eab0e27 100644
--- a/include/configs/mx53loco.h
+++ b/include/configs/mx53loco.h
@@ -43,6 +43,7 @@
 #define CONFIG_BOARD_EARLY_INIT_F
 #define CONFIG_BOARD_LATE_INIT
 #define CONFIG_MXC_GPIO
+#define CONFIG_REVISION_TAG
 
 #define CONFIG_MXC_UART
 #define CONFIG_MXC_UART_BASE	UART1_BASE
-- 
1.7.1