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>
diff --git a/arch/arm/include/asm/arch-omap4/clocks.h b/arch/arm/include/asm/arch-omap4/clocks.h
index ba52574..c2a9b46 100644
--- a/arch/arm/include/asm/arch-omap4/clocks.h
+++ b/arch/arm/include/asm/arch-omap4/clocks.h
@@ -698,6 +698,7 @@
void setup_post_dividers(u32 *const base, const struct dpll_params *params);
u32 get_sys_clk_index(void);
void enable_basic_clocks(void);
+void enable_basic_uboot_clocks(void);
void enable_non_essential_clocks(void);
void do_enable_clocks(u32 *const *clk_domains,
u32 *const *clk_modules_hw_auto,
diff --git a/arch/arm/include/asm/arch-omap4/omap.h b/arch/arm/include/asm/arch-omap4/omap.h
index 0ade896..e994257 100644
--- a/arch/arm/include/asm/arch-omap4/omap.h
+++ b/arch/arm/include/asm/arch-omap4/omap.h
@@ -191,5 +191,21 @@
#define DEV_DESC_PTR_OFFSET 0x4
#define DEV_DATA_PTR_OFFSET 0x18
#define BOOT_MODE_OFFSET 0x8
+#define RESET_REASON_OFFSET 0x9
+#define CH_FLAGS_OFFSET 0xA
+
+#define CH_FLAGS_CHSETTINGS (0x1 << 0)
+#define CH_FLAGS_CHRAM (0x1 << 1)
+#define CH_FLAGS_CHFLASH (0x1 << 2)
+#define CH_FLAGS_CHMMCSD (0x1 << 3)
+#ifndef __ASSEMBLY__
+struct omap_boot_parameters {
+ char *boot_message;
+ unsigned int mem_boot_descriptor;
+ unsigned char omap_bootdevice;
+ unsigned char reset_reason;
+ unsigned char ch_flags;
+};
+#endif
#endif
diff --git a/arch/arm/include/asm/arch-omap4/sys_proto.h b/arch/arm/include/asm/arch-omap4/sys_proto.h
index b8113e1..4146e21 100644
--- a/arch/arm/include/asm/arch-omap4/sys_proto.h
+++ b/arch/arm/include/asm/arch-omap4/sys_proto.h
@@ -55,6 +55,13 @@
u32 cortex_rev(void);
void init_omap_revision(void);
void do_io_settings(void);
+/*
+ * This is used to verify if the configuration header
+ * was executed by Romcode prior to control of transfer
+ * to the bootloader. SPL is responsible for saving and
+ * passing this to the u-boot.
+ */
+extern struct omap_boot_parameters boot_params;
static inline u32 running_from_sdram(void)
{
@@ -67,15 +74,17 @@
static inline u8 uboot_loaded_by_spl(void)
{
/*
- * Configuration Header is not supported yet, so u-boot init running
- * from SDRAM implies that it was loaded by SPL. When this situation
- * changes one of these approaches could be taken:
- * i. Pass a magic from SPL to U-Boot and U-Boot save it at a known
- * location.
- * ii. Check the OPP. CH can support only 50% OPP while SPL initializes
- * the DPLLs at 100% OPP.
+ * u-boot can be running from sdram either because of configuration
+ * Header or by SPL. If because of CH, then the romcode sets the
+ * CHSETTINGS executed bit to true in the boot parameter structure that
+ * it passes to the bootloader.This parameter is stored in the ch_flags
+ * variable by both SPL and u-boot.Check out for CHSETTINGS, which is a
+ * mandatory section if CH is present.
*/
- return running_from_sdram();
+ if ((boot_params.ch_flags) & (CH_FLAGS_CHSETTINGS))
+ return 0;
+ else
+ return running_from_sdram();
}
/*
* The basic hardware init of OMAP(s_init()) can happen in 4
diff --git a/arch/arm/include/asm/arch-omap5/clocks.h b/arch/arm/include/asm/arch-omap5/clocks.h
index edcc9e9..fa99f65 100644
--- a/arch/arm/include/asm/arch-omap5/clocks.h
+++ b/arch/arm/include/asm/arch-omap5/clocks.h
@@ -708,6 +708,7 @@
u32 get_sys_clk_index(void);
void enable_basic_clocks(void);
void enable_non_essential_clocks(void);
+void enable_basic_uboot_clocks(void);
void do_enable_clocks(u32 *const *clk_domains,
u32 *const *clk_modules_hw_auto,
u32 *const *clk_modules_explicit_en,
diff --git a/arch/arm/include/asm/arch-omap5/omap.h b/arch/arm/include/asm/arch-omap5/omap.h
index 85975de..d811d6e 100644
--- a/arch/arm/include/asm/arch-omap5/omap.h
+++ b/arch/arm/include/asm/arch-omap5/omap.h
@@ -203,5 +203,21 @@
#define DEV_DESC_PTR_OFFSET 0x4
#define DEV_DATA_PTR_OFFSET 0x18
#define BOOT_MODE_OFFSET 0x8
+#define RESET_REASON_OFFSET 0x9
+#define CH_FLAGS_OFFSET 0xA
+
+#define CH_FLAGS_CHSETTINGS (0x1 << 0)
+#define CH_FLAGS_CHRAM (0x1 << 1)
+#define CH_FLAGS_CHFLASH (0x1 << 2)
+#define CH_FLAGS_CHMMCSD (0x1 << 3)
+#ifndef __ASSEMBLY__
+struct omap_boot_parameters {
+ char *boot_message;
+ unsigned int mem_boot_descriptor;
+ unsigned char omap_bootdevice;
+ unsigned char reset_reason;
+ unsigned char ch_flags;
+};
+#endif /* __ASSEMBLY__ */
#endif
diff --git a/arch/arm/include/asm/arch-omap5/sys_proto.h b/arch/arm/include/asm/arch-omap5/sys_proto.h
index 3803ea9..c31e18c 100644
--- a/arch/arm/include/asm/arch-omap5/sys_proto.h
+++ b/arch/arm/include/asm/arch-omap5/sys_proto.h
@@ -75,15 +75,17 @@
static inline u8 uboot_loaded_by_spl(void)
{
/*
- * Configuration Header is not supported yet, so u-boot init running
- * from SDRAM implies that it was loaded by SPL. When this situation
- * changes one of these approaches could be taken:
- * i. Pass a magic from SPL to U-Boot and U-Boot save it at a known
- * location.
- * ii. Check the OPP. CH can support only 50% OPP while SPL initializes
- * the DPLLs at 100% OPP.
+ * u-boot can be running from sdram either because of configuration
+ * Header or by SPL. If because of CH, then the romcode sets the
+ * CHSETTINGS executed bit to true in the boot parameter structure that
+ * it passes to the bootloader.This parameter is stored in the ch_flags
+ * variable by both SPL and u-boot.Check out for CHSETTINGS, which is a
+ * mandatory section if CH is present.
*/
- return running_from_sdram();
+ if ((boot_params.ch_flags) & (CH_FLAGS_CHSETTINGS))
+ return 0;
+ else
+ return running_from_sdram();
}
/*
* The basic hardware init of OMAP(s_init()) can happen in 4
diff --git a/arch/arm/include/asm/omap_common.h b/arch/arm/include/asm/omap_common.h
index f026805..f1562ea 100644
--- a/arch/arm/include/asm/omap_common.h
+++ b/arch/arm/include/asm/omap_common.h
@@ -80,6 +80,7 @@
extern struct spl_image_info spl_image;
+extern u32* boot_params_ptr;
u32 omap_boot_device(void);
u32 omap_boot_mode(void);