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authorPaul Walmsley <paul@pwsan.com>2010-12-21 20:01:21 -0700
committerPaul Walmsley <paul@pwsan.com>2010-12-21 20:01:21 -0700
commit166353bd75587a2158d713af1b9489a79e0ce297 (patch)
treef7bda5c2c53d7c3ab253db9ddcb49c147afaaf42
parentdc0b3a701499bb7727314d7a9c764f7486db4802 (diff)
downloadop-kernel-dev-166353bd75587a2158d713af1b9489a79e0ce297.zip
op-kernel-dev-166353bd75587a2158d713af1b9489a79e0ce297.tar.gz
OMAP3: control/PRCM: add omap3_ctrl_write_boot_mode()
Get rid of the open-coded scratchpad write in mach-omap2/prcm.c and replace it with an actual API, omap3_ctrl_write_boot_mode(). While there, get rid of the gratuitous omap_writel(). There's not much documentation available for what should wind up in the scratchpad here, so more documentation would be appreciated. Also, at some point, we should formalize our treatment of the scratchpad; right now, accesses to the scratchpad are not well-documented. Signed-off-by: Paul Walmsley <paul@pwsan.com> Reviewed-by: Kevin Hilman <khilman@deeprootsystems.com> Tested-by: Kevin Hilman <khilman@deeprootsystems.com> Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
-rw-r--r--arch/arm/mach-omap2/control.c31
-rw-r--r--arch/arm/mach-omap2/control.h1
-rw-r--r--arch/arm/mach-omap2/prcm.c10
3 files changed, 33 insertions, 9 deletions
diff --git a/arch/arm/mach-omap2/control.c b/arch/arm/mach-omap2/control.c
index 0269bb0..d058f7c 100644
--- a/arch/arm/mach-omap2/control.c
+++ b/arch/arm/mach-omap2/control.c
@@ -209,6 +209,37 @@ void omap4_ctrl_pad_writel(u32 val, u16 offset)
__raw_writel(val, OMAP4_CTRL_PAD_REGADDR(offset));
}
+#ifdef CONFIG_ARCH_OMAP3
+
+/**
+ * omap3_ctrl_write_boot_mode - set scratchpad boot mode for the next boot
+ * @bootmode: 8-bit value to pass to some boot code
+ *
+ * Set the bootmode in the scratchpad RAM. This is used after the
+ * system restarts. Not sure what actually uses this - it may be the
+ * bootloader, rather than the boot ROM - contrary to the preserved
+ * comment below. No return value.
+ */
+void omap3_ctrl_write_boot_mode(u8 bootmode)
+{
+ u32 l;
+
+ l = ('B' << 24) | ('M' << 16) | bootmode;
+
+ /*
+ * Reserve the first word in scratchpad for communicating
+ * with the boot ROM. A pointer to a data structure
+ * describing the boot process can be stored there,
+ * cf. OMAP34xx TRM, Initialization / Software Booting
+ * Configuration.
+ *
+ * XXX This should use some omap_ctrl_writel()-type function
+ */
+ __raw_writel(l, OMAP2_L4_IO_ADDRESS(OMAP343X_SCRATCHPAD + 4));
+}
+
+#endif
+
#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)
/*
* Clears the scratchpad contents in case of cold boot-
diff --git a/arch/arm/mach-omap2/control.h b/arch/arm/mach-omap2/control.h
index 6e5f7e5..4bfc1f0 100644
--- a/arch/arm/mach-omap2/control.h
+++ b/arch/arm/mach-omap2/control.h
@@ -357,6 +357,7 @@ extern u32 *get_omap3630_restore_pointer(void);
extern u32 omap3_arm_context[128];
extern void omap3_control_save_context(void);
extern void omap3_control_restore_context(void);
+extern void omap3_ctrl_write_boot_mode(u8 bootmode);
extern void omap3630_ctrl_disable_rta(void);
#else
#define omap_ctrl_base_get() 0
diff --git a/arch/arm/mach-omap2/prcm.c b/arch/arm/mach-omap2/prcm.c
index a51846e..2eca8475 100644
--- a/arch/arm/mach-omap2/prcm.c
+++ b/arch/arm/mach-omap2/prcm.c
@@ -143,16 +143,8 @@ void omap_prcm_arch_reset(char mode, const char *cmd)
prcm_offs = WKUP_MOD;
} else if (cpu_is_omap34xx()) {
- u32 l;
-
prcm_offs = OMAP3430_GR_MOD;
- l = ('B' << 24) | ('M' << 16) | (cmd ? (u8)*cmd : 0);
- /* Reserve the first word in scratchpad for communicating
- * with the boot ROM. A pointer to a data structure
- * describing the boot process can be stored there,
- * cf. OMAP34xx TRM, Initialization / Software Booting
- * Configuration. */
- omap_writel(l, OMAP343X_SCRATCHPAD + 4);
+ omap3_ctrl_write_boot_mode((cmd ? (u8)*cmd : 0));
} else if (cpu_is_omap44xx())
prcm_offs = OMAP4430_PRM_DEVICE_MOD;
else
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