ARM: OMAP2+: control: new APIs to configure boot address and mode

SCM contains boot addr and boot mode registers to control
other processors on different OMAP versions. It controls the
boot address and mode for DSP based subsystems like: IVA 2.1
(OMAP2430), IVA 2.2 (OMAP3) and DSP (OMAP4).

If contained within SCM registers, when a processor is
booting it uses BOOTADDR to start running the code at that
location. BOOTMOD register specifies a different set of
modes for the processor to execute when booting (from direct,
idle, self-loop, user and default).

Since there was no offset associated with OMAP4, this patch
defines it.

Signed-off-by: Omar Ramirez Luna <omar.luna@linaro.org>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

3 files changed, 46 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/control.c b/arch/arm/mach-omap2/control.c
index 08e674bb0417..3223b81e7532 100644
--- a/arch/arm/mach-omap2/control.c
+++ b/arch/arm/mach-omap2/control.c
@@ -241,6 +241,49 @@ void omap3_ctrl_write_boot_mode(u8 bootmode)
 
 #endif
 
+/**
+ * omap_ctrl_write_dsp_boot_addr - set boot address for a remote processor
+ * @bootaddr: physical address of the boot loader
+ *
+ * Set boot address for the boot loader of a supported processor
+ * when a power ON sequence occurs.
+ */
+void omap_ctrl_write_dsp_boot_addr(u32 bootaddr)
+{
+        u32 offset = cpu_is_omap243x() ? OMAP243X_CONTROL_IVA2_BOOTADDR :
+                     cpu_is_omap34xx() ? OMAP343X_CONTROL_IVA2_BOOTADDR :
+                     cpu_is_omap44xx() ? OMAP4_CTRL_MODULE_CORE_DSP_BOOTADDR :
+                     0;
+
+        if (!offset) {
+                pr_err("%s: unsupported omap type\n", __func__);
+                return;
+        }
+
+        omap_ctrl_writel(bootaddr, offset);
+}
+
+/**
+ * omap_ctrl_write_dsp_boot_mode - set boot mode for a remote processor
+ * @bootmode: 8-bit value to pass to some boot code
+ *
+ * Sets boot mode for the boot loader of a supported processor
+ * when a power ON sequence occurs.
+ */
+void omap_ctrl_write_dsp_boot_mode(u8 bootmode)
+{
+        u32 offset = cpu_is_omap243x() ? OMAP243X_CONTROL_IVA2_BOOTMOD :
+                     cpu_is_omap34xx() ? OMAP343X_CONTROL_IVA2_BOOTMOD :
+                     0;
+
+        if (!offset) {
+                pr_err("%s: unsupported omap type\n", __func__);
+                return;
+        }
+
+        omap_ctrl_writel(bootmode, offset);
+}
+
 #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 a406fd045ce1..fcc98f822d9d 100644
--- a/arch/arm/mach-omap2/control.h
+++ b/arch/arm/mach-omap2/control.h
@@ -397,6 +397,8 @@ 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 omap_ctrl_write_dsp_boot_addr(u32 bootaddr);
+extern void omap_ctrl_write_dsp_boot_mode(u8 bootmode);
 extern void omap3630_ctrl_disable_rta(void);
 extern int omap3_ctrl_save_padconf(void);
 #else
diff --git a/arch/arm/mach-omap2/include/mach/ctrl_module_core_44xx.h b/arch/arm/mach-omap2/include/mach/ctrl_module_core_44xx.h
index 2f7ac70a20d8..01970824e0e5 100644
--- a/arch/arm/mach-omap2/include/mach/ctrl_module_core_44xx.h
+++ b/arch/arm/mach-omap2/include/mach/ctrl_module_core_44xx.h
@@ -42,6 +42,7 @@
 #define OMAP4_CTRL_MODULE_CORE_STD_FUSE_OPP_DPLL_1              0x0268
 #define OMAP4_CTRL_MODULE_CORE_STATUS                           0x02c4
 #define OMAP4_CTRL_MODULE_CORE_DEV_CONF                         0x0300
+#define OMAP4_CTRL_MODULE_CORE_DSP_BOOTADDR                     0x0304
 #define OMAP4_CTRL_MODULE_CORE_LDOVBB_IVA_VOLTAGE_CTRL          0x0314
 #define OMAP4_CTRL_MODULE_CORE_LDOVBB_MPU_VOLTAGE_CTRL          0x0318
 #define OMAP4_CTRL_MODULE_CORE_LDOSRAM_IVA_VOLTAGE_CTRL         0x0320