omap4/5: Add support for booting with CH.

Configuration header(CH) is 512 byte header attached to an OMAP
boot image that will help ROM code to initialize clocks, SDRAM
etc and copy U-Boot directly into SDRAM. CH can help us in
by-passing SPL and directly boot U-boot, hence it's an alternative
for SPL. However, we intend to support both CH and SPL for OMAP4/5.

Initialization done through CH is limited and is not equivalent
to that done by SPL. So U-Boot has to distinguish between the
two cases and handle them accordingly. This patch takes care
of doing this.

Signed-off-by: sricharan <r.sricharan@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

1 files changed, 22 insertions, 2 deletions

diff --git a/arch/arm/cpu/armv7/omap-common/hwinit-common.c b/arch/arm/cpu/armv7/omap-common/hwinit-common.c
index 5cf4e2bb2..f65705db1 100644
--- a/arch/arm/cpu/armv7/omap-common/hwinit-common.c
+++ b/arch/arm/cpu/armv7/omap-common/hwinit-common.c
@@ -31,9 +31,18 @@
 #include <asm/arch/sys_proto.h>
 #include <asm/sizes.h>
 #include <asm/emif.h>
+#include <asm/omap_common.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
+/*
+ * This is used to verify if the configuration header
+ * was executed by rom code prior to control of transfer
+ * to the bootloader. SPL is responsible for saving and
+ * passing the boot_params pointer to the u-boot.
+ */
+struct omap_boot_parameters boot_params __attribute__ ((section(".data")));
+
 #ifdef CONFIG_SPL_BUILD
 /*
  * We use static variables because global data is not ready yet.
@@ -41,12 +50,11 @@ DECLARE_GLOBAL_DATA_PTR;
  * We would not typically need to save these parameters in regular
  * U-Boot. This is needed only in SPL at the moment.
  */
-u32 omap_bootdevice = BOOT_DEVICE_MMC1;
 u32 omap_bootmode = MMCSD_MODE_FAT;
 
 u32 omap_boot_device(void)
 {
-	return omap_bootdevice;
+	return (u32) (boot_params.omap_bootdevice);
 }
 
 u32 omap_boot_mode(void)
@@ -71,12 +79,16 @@ static void set_mux_conf_regs(void)
 		set_muxconf_regs_essential();
 		break;
 	case OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL:
+#ifdef CONFIG_SYS_ENABLE_PADS_ALL
 		set_muxconf_regs_non_essential();
+#endif
 		break;
 	case OMAP_INIT_CONTEXT_UBOOT_FROM_NOR:
 	case OMAP_INIT_CONTEXT_UBOOT_AFTER_CH:
 		set_muxconf_regs_essential();
+#ifdef CONFIG_SYS_ENABLE_PADS_ALL
 		set_muxconf_regs_non_essential();
+#endif
 		break;
 	}
 }
@@ -103,6 +115,13 @@ void omap_rev_string(char *omap_rev_string)
 		minor_rev);
 }
 
+#ifdef CONFIG_SPL_BUILD
+static void init_boot_params(void)
+{
+	boot_params_ptr = (u32 *) &boot_params;
+}
+#endif
+
 /*
  * Routine: s_init
  * Description: Does early system init of watchdog, muxing,  andclocks
@@ -131,6 +150,7 @@ void s_init(void)
 #ifdef CONFIG_SPL_BUILD
 	/* For regular u-boot sdram_init() is called from dram_init() */
 	sdram_init();
+	init_boot_params();
 #endif
 }