ENGR00315499-5: Support i.MX6 1.2GHz via LDO bypass

Add check for 1.2GHz core speed. If Speed grading fuse is for 1.2GHz,
enable LDO bypass and setup PMIC voltages. LDO bypass is dependent
on the flatten device tree file.

Signed-off-by: Nitin Garg <nitin.garg@freescale.com>

1 files changed, 40 insertions, 1 deletions

diff --git a/board/freescale/mx6slevk/mx6slevk.c b/board/freescale/mx6slevk/mx6slevk.c
index aadad32..aeb418b 100644
--- a/board/freescale/mx6slevk/mx6slevk.c
+++ b/board/freescale/mx6slevk/mx6slevk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Freescale Semiconductor, Inc.
+ * Copyright (C) 2013-2014 Freescale Semiconductor, Inc.
  *
  * Author: Fabio Estevam <fabio.estevam@freescale.com>
  *
@@ -19,6 +19,10 @@
 #include <fsl_esdhc.h>
 #include <mmc.h>
 #include <netdev.h>
+#ifdef CONFIG_SYS_I2C_MXC
+#include <i2c.h>
+#include <asm/imx-common/mxc_i2c.h>
+#endif
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -128,6 +132,41 @@ static int setup_fec(void)
 }
 #endif
 
+#ifdef CONFIG_LDO_BYPASS_CHECK
+void ldo_mode_set(int ldo_bypass)
+{
+	unsigned char value;
+	/* swith to ldo_bypass mode */
+	if (ldo_bypass) {
+		/* decrease VDDARM to 1.15V */
+		if (i2c_read(0x8, 0x20, 1, &value, 1)) {
+			printf("Read SW1AB error!\n");
+			return;
+		}
+		value &= ~0x3f;
+		value |= 0x22;
+		if (i2c_write(0x8, 0x20, 1, &value, 1)) {
+			printf("Set SW1AB error!\n");
+			return;
+		}
+		/* increase VDDSOC to 1.15V */
+		if (i2c_read(0x8, 0x2e, 1, &value, 1)) {
+			printf("Read SW1C error!\n");
+			return;
+		}
+		value &= ~0x3f;
+		value |= 0x22;
+		if (i2c_write(0x8, 0x2e, 1, &value, 1)) {
+			printf("Set SW1C error!\n");
+			return;
+		}
+
+		set_anatop_bypass();
+		printf("switch to ldo_bypass mode!\n");
+	}
+
+}
+#endif
 
 int board_early_init_f(void)
 {