ARM: OMAP5 / DRA7: PM: Provide a dummy startup function for CPU hotplug

Dont assume that all OMAP4+ code will be able to use OMAP4 hotplug
logic. On OMAP5, DRA7, we do not need this in place yet, also,
currently the CPU startup pointer is located in omap4_cpu_pm_info
instead of cpu_pm_ops.

So, isolate the function to hotplug_restart pointer in cpu_pm_ops
where it should have belonged, initalize them as per valid startup
pointers for OMAP4430/60 as in current logic, however provide
dummy_cpu_resume to be the startup location as well.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
[nm@ti.com: split this out of original code and isolate it]
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Tested-by: Kevin Hilman <khilman@linaro.org>

diff --git a/arch/arm/mach-omap2/omap-mpuss-lowpower.c b/arch/arm/mach-omap2/omap-mpuss-lowpower.c
index 53d8de5..207fce2 100644 (file)
--- a/arch/arm/mach-omap2/omap-mpuss-lowpower.c
+++ b/arch/arm/mach-omap2/omap-mpuss-lowpower.c
@@ -69,7 +69,6 @@ struct omap4_cpu_pm_info {
        void __iomem *scu_sar_addr;
        void __iomem *wkup_sar_addr;
        void __iomem *l2x0_sar_addr;
-       void (*secondary_startup)(void);
 };
 
 /**
@@ -77,6 +76,7 @@ struct omap4_cpu_pm_info {
  * @finish_suspend:    CPU suspend finisher function pointer
  * @resume:            CPU resume function pointer
  * @scu_prepare:       CPU Snoop Control program function pointer
+ * @hotplug_restart:   CPU restart function pointer
  *
  * Structure holds functions pointer for CPU low power operations like
  * suspend, resume and scu programming.
@@ -85,6 +85,7 @@ struct cpu_pm_ops {
        int (*finish_suspend)(unsigned long cpu_state);
        void (*resume)(void);
        void (*scu_prepare)(unsigned int cpu_id, unsigned int cpu_state);
+       void (*hotplug_restart)(void);
 };
 
 static DEFINE_PER_CPU(struct omap4_cpu_pm_info, omap4_pm_info);
@@ -108,6 +109,7 @@ struct cpu_pm_ops omap_pm_ops = {
        .finish_suspend         = default_finish_suspend,
        .resume                 = dummy_cpu_resume,
        .scu_prepare            = dummy_scu_prepare,
+       .hotplug_restart        = dummy_cpu_resume,
 };
 
 /*
@@ -312,7 +314,7 @@ int omap4_hotplug_cpu(unsigned int cpu, unsigned int power_state)
 
        pwrdm_clear_all_prev_pwrst(pm_info->pwrdm);
        pwrdm_set_next_pwrst(pm_info->pwrdm, power_state);
-       set_cpu_wakeup_addr(cpu, virt_to_phys(pm_info->secondary_startup));
+       set_cpu_wakeup_addr(cpu, virt_to_phys(omap_pm_ops.hotplug_restart));
        omap_pm_ops.scu_prepare(cpu, power_state);
 
        /*
@@ -385,10 +387,6 @@ int __init omap4_mpuss_init(void)
                                        CPU1_WAKEUP_NS_PA_ADDR_OFFSET;
                pm_info->l2x0_sar_addr = sar_base + L2X0_SAVE_OFFSET1;
        }
-       if (cpu_is_omap446x())
-               pm_info->secondary_startup = omap4460_secondary_startup;
-       else
-               pm_info->secondary_startup = omap4_secondary_startup;
 
        pm_info->pwrdm = pwrdm_lookup("cpu1_pwrdm");
        if (!pm_info->pwrdm) {
@@ -422,12 +420,16 @@ int __init omap4_mpuss_init(void)
                omap_pm_ops.finish_suspend = omap4_finish_suspend;
                omap_pm_ops.resume = omap4_cpu_resume;
                omap_pm_ops.scu_prepare = scu_pwrst_prepare;
+               omap_pm_ops.hotplug_restart = omap4_secondary_startup;
                cpu_context_offset = OMAP4_RM_CPU0_CPU0_CONTEXT_OFFSET;
        } else if (soc_is_omap54xx() || soc_is_dra7xx()) {
                cpu_context_offset = OMAP54XX_RM_CPU0_CPU0_CONTEXT_OFFSET;
                enable_mercury_retention_mode();
        }
 
+       if (cpu_is_omap446x())
+               omap_pm_ops.hotplug_restart = omap4460_secondary_startup;
+
        return 0;
 }