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From 99324818889fb34c36dd8d15b920bea78bdced35 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eric=20B=C3=A9nard?= <eric@eukrea.com>
Date: Tue, 21 Feb 2012 01:09:15 +0100
Subject: [PATCH 6/7] mx53-loco: add board revision support
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
- this is taken from freescale-mx35-3-stack/3stack.c and allows
this board to run Freescale's kernel which relies on the system
revision to configure the correct PMIC.
- On rev0 boards (with DA9053), the log is :
detected i.MX53 rev 2.1
MCIMX53-START board 1.0
On newer boards (rev A or B with MC34708), the log is :
mc34708-i2c@mc34708-i2c0: MC34708 ID: 0x0014
detected i.MX53 rev 2.1
MCIMX53-START-R board 1.0 rev B
Signed-off-by: Eric B�nard <eric@eukrea.com>
---
Upstream-Status: Applied for 2012.04.0
arch/arm/boards/freescale-mx53-loco/board.c | 51 +++++++++++++++++++++++++++
1 files changed, 51 insertions(+), 0 deletions(-)
diff --git a/arch/arm/boards/freescale-mx53-loco/board.c b/arch/arm/boards/freescale-mx53-loco/board.c
index 14c053a..115a8a3 100644
--- a/arch/arm/boards/freescale-mx53-loco/board.c
+++ b/arch/arm/boards/freescale-mx53-loco/board.c
@@ -103,6 +103,31 @@ static struct i2c_board_info i2c_devices[] = {
},
};
+/*
+ * Revision to be passed to kernel. The kernel provided
+ * by freescale relies on this.
+ *
+ * C --> CPU type
+ * S --> Silicon revision
+ * B --> Board rev
+ *
+ * 31 20 16 12 8 4 0
+ * | Cmaj | Cmin | B | Smaj | Smin|
+ *
+ * e.g 0x00053120 --> i.MX35, Cpu silicon rev 2.0, Board rev 2
+*/
+static unsigned int loco_system_rev = 0x00053000;
+
+static void set_silicon_rev( int rev)
+{
+ loco_system_rev = loco_system_rev | (rev & 0xFF);
+}
+
+static void set_board_rev(int rev)
+{
+ loco_system_rev = (loco_system_rev & ~(0xF << 8)) | (rev & 0xF) << 8;
+}
+
static int loco_mem_init(void)
{
arm_add_mem_device("ram0", 0x70000000, SZ_512M);
@@ -149,6 +174,8 @@ static int loco_devices_init(void)
loco_fec_reset();
+ set_silicon_rev(imx_silicon_revision());
+
armlinux_set_bootparams((void *)0x70000100);
armlinux_set_architecture(MACH_TYPE_MX53_LOCO);
@@ -177,3 +204,27 @@ static int loco_console_init(void)
}
console_initcall(loco_console_init);
+
+static int loco_pmic_init(void)
+{
+ struct mc34708 *mc34708;
+ int rev;
+
+ mc34708 = mc34708_get();
+ if (!mc34708) {
+ /* so we have a DA9053 based board */
+ printf("MCIMX53-START board 1.0\n");
+ armlinux_set_revision(loco_system_rev);
+ return 0;
+ }
+
+ /* get the board revision from fuse */
+ rev = readl(MX53_IIM_BASE_ADDR + 0x878);
+ set_board_rev(rev);
+ printf("MCIMX53-START-R board 1.0 rev %c\n", (rev == 1) ? 'A' : 'B' );
+ armlinux_set_revision(loco_system_rev);
+
+ return 0;
+}
+
+late_initcall(loco_pmic_init);
--
1.7.7.6
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