ARM: OMAP5 / DRA7: PM: Avoid all SAR saves

Get rid of all assumptions about always having a sar base on *all*
OMAP4+ platforms. We dont need one on DRA7 and it is not necessary at
this point for OMAP5 either.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
[nm@ti.com: Split and optimize]
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Tested-by: Kevin Hilman <khilman@linaro.org>

1 files changed, 34 insertions, 21 deletions

diff --git a/arch/arm/mach-omap2/omap-mpuss-lowpower.c b/arch/arm/mach-omap2/omap-mpuss-lowpower.c
index fad6e8c7e69e..53d8de5764e8 100644
--- a/arch/arm/mach-omap2/omap-mpuss-lowpower.c
+++ b/arch/arm/mach-omap2/omap-mpuss-lowpower.c
@@ -118,7 +118,8 @@ static inline void set_cpu_wakeup_addr(unsigned int cpu_id, u32 addr)
 {
         struct omap4_cpu_pm_info *pm_info = &per_cpu(omap4_pm_info, cpu_id);
 
-        writel_relaxed(addr, pm_info->wkup_sar_addr);
+        if (pm_info->wkup_sar_addr)
+                writel_relaxed(addr, pm_info->wkup_sar_addr);
 }
 
 /*
@@ -143,7 +144,8 @@ static void scu_pwrst_prepare(unsigned int cpu_id, unsigned int cpu_state)
                 break;
         }
 
-        writel_relaxed(scu_pwr_st, pm_info->scu_sar_addr);
+        if (pm_info->scu_sar_addr)
+                writel_relaxed(scu_pwr_st, pm_info->scu_sar_addr);
 }
 
 /* Helper functions for MPUSS OSWR */
@@ -181,7 +183,8 @@ static void l2x0_pwrst_prepare(unsigned int cpu_id, unsigned int save_state)
 {
         struct omap4_cpu_pm_info *pm_info = &per_cpu(omap4_pm_info, cpu_id);
 
-        writel_relaxed(save_state, pm_info->l2x0_sar_addr);
+        if (pm_info->l2x0_sar_addr)
+                writel_relaxed(save_state, pm_info->l2x0_sar_addr);
 }
 
 /*
@@ -191,10 +194,14 @@ static void l2x0_pwrst_prepare(unsigned int cpu_id, unsigned int save_state)
 #ifdef CONFIG_CACHE_L2X0
 static void __init save_l2x0_context(void)
 {
-        writel_relaxed(l2x0_saved_regs.aux_ctrl,
-                     sar_base + L2X0_AUXCTRL_OFFSET);
-        writel_relaxed(l2x0_saved_regs.prefetch_ctrl,
-                     sar_base + L2X0_PREFETCH_CTRL_OFFSET);
+        void __iomem *l2x0_base = omap4_get_l2cache_base();
+
+        if (l2x0_base && sar_base) {
+                writel_relaxed(l2x0_saved_regs.aux_ctrl,
+                               sar_base + L2X0_AUXCTRL_OFFSET);
+                writel_relaxed(l2x0_saved_regs.prefetch_ctrl,
+                               sar_base + L2X0_PREFETCH_CTRL_OFFSET);
+        }
 }
 #else
 static void __init save_l2x0_context(void)
@@ -347,13 +354,17 @@ int __init omap4_mpuss_init(void)
                 return -ENODEV;
         }
 
-        sar_base = omap4_get_sar_ram_base();
+        if (cpu_is_omap44xx())
+                sar_base = omap4_get_sar_ram_base();
 
         /* Initilaise per CPU PM information */
         pm_info = &per_cpu(omap4_pm_info, 0x0);
-        pm_info->scu_sar_addr = sar_base + SCU_OFFSET0;
-        pm_info->wkup_sar_addr = sar_base + CPU0_WAKEUP_NS_PA_ADDR_OFFSET;
-        pm_info->l2x0_sar_addr = sar_base + L2X0_SAVE_OFFSET0;
+        if (sar_base) {
+                pm_info->scu_sar_addr = sar_base + SCU_OFFSET0;
+                pm_info->wkup_sar_addr = sar_base +
+                                        CPU0_WAKEUP_NS_PA_ADDR_OFFSET;
+                pm_info->l2x0_sar_addr = sar_base + L2X0_SAVE_OFFSET0;
+        }
         pm_info->pwrdm = pwrdm_lookup("cpu0_pwrdm");
         if (!pm_info->pwrdm) {
                 pr_err("Lookup failed for CPU0 pwrdm\n");
@@ -368,9 +379,12 @@ int __init omap4_mpuss_init(void)
         pwrdm_set_next_pwrst(pm_info->pwrdm, PWRDM_POWER_ON);
 
         pm_info = &per_cpu(omap4_pm_info, 0x1);
-        pm_info->scu_sar_addr = sar_base + SCU_OFFSET1;
-        pm_info->wkup_sar_addr = sar_base + CPU1_WAKEUP_NS_PA_ADDR_OFFSET;
-        pm_info->l2x0_sar_addr = sar_base + L2X0_SAVE_OFFSET1;
+        if (sar_base) {
+                pm_info->scu_sar_addr = sar_base + SCU_OFFSET1;
+                pm_info->wkup_sar_addr = sar_base +
+                                        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
@@ -397,13 +411,12 @@ int __init omap4_mpuss_init(void)
         pwrdm_clear_all_prev_pwrst(mpuss_pd);
         mpuss_clear_prev_logic_pwrst();
 
-        /* Save device type on scratchpad for low level code to use */
-        if (omap_type() != OMAP2_DEVICE_TYPE_GP)
-                writel_relaxed(1, sar_base + OMAP_TYPE_OFFSET);
-        else
-                writel_relaxed(0, sar_base + OMAP_TYPE_OFFSET);
-
-        save_l2x0_context();
+        if (sar_base) {
+                /* Save device type on scratchpad for low level code to use */
+                writel_relaxed((omap_type() != OMAP2_DEVICE_TYPE_GP) ? 1 : 0,
+                               sar_base + OMAP_TYPE_OFFSET);
+                save_l2x0_context();
+        }
 
         if (cpu_is_omap44xx()) {
                 omap_pm_ops.finish_suspend = omap4_finish_suspend;