OMAP4: AuxCoreBoot registers only accessible in secure mode

The AuxCoreBoot0 and AuxCoreBoot1 can be only accessed in secure
mode. Replace the current code with secure monitor API's to access/modify
these registers.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

3 files changed, 37 insertions, 24 deletions

diff --git a/arch/arm/mach-omap2/omap-headsmp.S b/arch/arm/mach-omap2/omap-headsmp.S
index 4afadba09477..aa3f65c2ac97 100644
--- a/arch/arm/mach-omap2/omap-headsmp.S
+++ b/arch/arm/mach-omap2/omap-headsmp.S
@@ -27,20 +27,39 @@
  * OMAP4 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 the this flag using a hardware
- * register AuxCoreBoot1.
+ * The primary core will update this flag using a hardware
+ * register AuxCoreBoot0.
  */
 ENTRY(omap_secondary_startup)
-        mrc     p15, 0, r0, c0, c0, 5
-        and     r0, r0, #0x0f
-hold:   ldr     r1, =OMAP4_AUX_CORE_BOOT1_PA    @ read from AuxCoreBoot1
-        ldr     r2, [r1]
-        cmp     r2, r0
+hold:   ldr     r12,=0x103
+        dsb
+        smc                             @ read from AuxCoreBoot0
+        mov     r0, r0, lsr #9
+        mrc     p15, 0, r4, c0, c0, 5
+        and     r4, r4, #0x0f
+        cmp     r0, r4
         bne     hold
 
         /*
-         * we've been released from the cpu_release,secondary_stack
+         * we've been released from the wait loop,secondary_stack
          * should now contain the SVC stack for this core
          */
         b       secondary_startup
+END(omap_secondary_startup)
 
+
+ENTRY(omap_modify_auxcoreboot0)
+        stmfd   sp!, {r1-r12, lr}
+        ldr     r12, =0x104
+        dsb
+        smc
+        ldmfd   sp!, {r1-r12, pc}
+END(omap_modify_auxcoreboot0)
+
+ENTRY(omap_auxcoreboot_addr)
+        stmfd   sp!, {r2-r12, lr}
+        ldr     r12, =0x105
+        dsb
+        smc
+        ldmfd   sp!, {r2-r12, pc}
+END(omap_auxcoreboot_addr)
diff --git a/arch/arm/mach-omap2/omap-smp.c b/arch/arm/mach-omap2/omap-smp.c
index 4890bcf4dadd..59e847843af5 100644
--- a/arch/arm/mach-omap2/omap-smp.c
+++ b/arch/arm/mach-omap2/omap-smp.c
@@ -21,15 +21,12 @@
 #include <linux/smp.h>
 #include <linux/io.h>
 
+#include <asm/cacheflush.h>
 #include <asm/localtimer.h>
 #include <asm/smp_scu.h>
 #include <mach/hardware.h>
 #include <plat/common.h>
 
-/* Registers used for communicating startup information */
-static void __iomem *omap4_auxcoreboot_reg0;
-static void __iomem *omap4_auxcoreboot_reg1;
-
 /* SCU base address */
 static void __iomem *scu_base;
 
@@ -74,12 +71,13 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
         spin_lock(&boot_lock);
 
         /*
-         * Update the AuxCoreBoot1 with boot state for secondary core.
+         * Update the AuxCoreBoot0 with boot state for secondary core.
          * omap_secondary_startup() routine will hold the secondary core till
          * the AuxCoreBoot1 register is updated with cpu state
          * A barrier is added to ensure that write buffer is drained
          */
-        __raw_writel(cpu, omap4_auxcoreboot_reg1);
+        omap_modify_auxcoreboot0(0x200, 0x0);
+        flush_cache_all();
         smp_wmb();
 
         timeout = jiffies + (1 * HZ);
@@ -99,17 +97,18 @@ static void __init wakeup_secondary(void)
 {
         /*
          * Write the address of secondary startup routine into the
-         * AuxCoreBoot0 where ROM code will jump and start executing
+         * AuxCoreBoot1 where ROM code will jump and start executing
          * on secondary core once out of WFE
          * A barrier is added to ensure that write buffer is drained
          */
-        __raw_writel(virt_to_phys(omap_secondary_startup),         \
-                                        omap4_auxcoreboot_reg0);
+        omap_auxcoreboot_addr(virt_to_phys(omap_secondary_startup));
         smp_wmb();
 
         /*
          * Send a 'sev' to wake the secondary core from WFE.
+         * Drain the outstanding writes to memory
          */
+        dsb();
         set_event();
         mb();
 }
@@ -136,7 +135,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 {
         unsigned int ncores = get_core_count();
         unsigned int cpu = smp_processor_id();
-        void __iomem *omap4_wkupgen_base;
         int i;
 
         /* sanity check */
@@ -168,12 +166,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
         for (i = 0; i < max_cpus; i++)
                 set_cpu_present(i, true);
 
-        /* Never released */
-        omap4_wkupgen_base = ioremap(OMAP44XX_WKUPGEN_BASE, SZ_4K);
-        BUG_ON(!omap4_wkupgen_base);
-        omap4_auxcoreboot_reg0 = omap4_wkupgen_base + 0x800;
-        omap4_auxcoreboot_reg1 = omap4_wkupgen_base + 0x804;
-
         if (max_cpus > 1) {
                 /*
                  * Enable the local timer or broadcast device for the
diff --git a/arch/arm/plat-omap/include/plat/smp.h b/arch/arm/plat-omap/include/plat/smp.h
index dcaa8fde7063..8983d54c4fd2 100644
--- a/arch/arm/plat-omap/include/plat/smp.h
+++ b/arch/arm/plat-omap/include/plat/smp.h
@@ -28,6 +28,8 @@
 
 /* Needed for secondary core boot */
 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);
 
 /*
  * We use Soft IRQ1 as the IPI