ARM: OMAP5: Add SMP support

Add OMAP5 SMP boot support using OMAP4 SMP code. The relevant code paths
are runtime checked using cpu id

Signed-off-by: R Sricharan <r.sricharan@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

3 files changed, 45 insertions, 12 deletions

diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
index 97e8792b33b0..960f98451a2e 100644
--- a/arch/arm/mach-omap2/common.h
+++ b/arch/arm/mach-omap2/common.h
@@ -276,6 +276,7 @@ extern void omap_secondary_startup(void);
 extern u32 omap_modify_auxcoreboot0(u32 set_mask, u32 clear_mask);
 extern void omap_auxcoreboot_addr(u32 cpu_addr);
 extern u32 omap_read_auxcoreboot0(void);
+extern void omap5_secondary_startup(void);
 #endif
 
 #if defined(CONFIG_SMP) && defined(CONFIG_PM)
diff --git a/arch/arm/mach-omap2/omap-headsmp.S b/arch/arm/mach-omap2/omap-headsmp.S
index 503ac777a2ba..502e3135aad3 100644
--- a/arch/arm/mach-omap2/omap-headsmp.S
+++ b/arch/arm/mach-omap2/omap-headsmp.S
@@ -19,6 +19,27 @@
 #include <linux/init.h>
 
         __CPUINIT
+
+/* Physical address needed since MMU not enabled yet on secondary core */
+#define AUX_CORE_BOOT0_PA                       0x48281800
+
+/*
+ * OMAP5 specific entry point for secondary CPU to jump from ROM
+ * code.  This routine also provides a holding flag into which
+ * secondary core is held until we're ready for it to initialise.
+ * The primary core will update this flag using a hardware
++ * register AuxCoreBoot0.
+ */
+ENTRY(omap5_secondary_startup)
+wait:   ldr     r2, =AUX_CORE_BOOT0_PA  @ read from AuxCoreBoot0
+        ldr     r0, [r2]
+        mov     r0, r0, lsr #5
+        mrc     p15, 0, r4, c0, c0, 5
+        and     r4, r4, #0x0f
+        cmp     r0, r4
+        bne     wait
+        b       secondary_startup
+END(omap5_secondary_startup)
 /*
  * OMAP4 specific entry point for secondary CPU to jump from ROM
  * code.  This routine also provides a holding flag into which
diff --git a/arch/arm/mach-omap2/omap-smp.c b/arch/arm/mach-omap2/omap-smp.c
index badfe398038e..7d118b9bdd5f 100644
--- a/arch/arm/mach-omap2/omap-smp.c
+++ b/arch/arm/mach-omap2/omap-smp.c
@@ -33,6 +33,12 @@
 #include "common.h"
 #include "clockdomain.h"
 
+#define CPU_MASK                0xff0ffff0
+#define CPU_CORTEX_A9           0x410FC090
+#define CPU_CORTEX_A15          0x410FC0F0
+
+#define OMAP5_CORE_COUNT        0x2
+
 /* SCU base address */
 static void __iomem *scu_base;
 
@@ -133,7 +139,6 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
 static void __init wakeup_secondary(void)
 {
         void __iomem *base = omap_get_wakeupgen_base();
-
         /*
          * Write the address of secondary startup routine into the
          * AuxCoreBoot1 where ROM code will jump and start executing
@@ -162,16 +167,21 @@ static void __init wakeup_secondary(void)
  */
 void __init smp_init_cpus(void)
 {
-        unsigned int i, ncores;
-
-        /*
-         * Currently we can't call ioremap here because
-         * SoC detection won't work until after init_early.
-         */
-        scu_base =  OMAP2_L4_IO_ADDRESS(OMAP44XX_SCU_BASE);
-        BUG_ON(!scu_base);
-
-        ncores = scu_get_core_count(scu_base);
+        unsigned int i = 0, ncores = 1, cpu_id;
+
+        /* Use ARM cpuid check here, as SoC detection will not work so early */
+        cpu_id = read_cpuid(CPUID_ID) & CPU_MASK;
+        if (cpu_id == CPU_CORTEX_A9) {
+                /*
+                 * Currently we can't call ioremap here because
+                 * SoC detection won't work until after init_early.
+                 */
+                scu_base =  OMAP2_L4_IO_ADDRESS(OMAP44XX_SCU_BASE);
+                BUG_ON(!scu_base);
+                ncores = scu_get_core_count(scu_base);
+        } else if (cpu_id == CPU_CORTEX_A15) {
+                ncores = OMAP5_CORE_COUNT;
+        }
 
         /* sanity check */
         if (ncores > nr_cpu_ids) {
@@ -193,6 +203,7 @@ void __init platform_smp_prepare_cpus(unsigned int max_cpus)
          * Initialise the SCU and wake up the secondary core using
          * wakeup_secondary().
          */
-        scu_enable(scu_base);
+        if (scu_base)
+                scu_enable(scu_base);
         wakeup_secondary();
 }