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authorDave Gerlach <d-gerlach@ti.com>2017-03-29 04:57:54 +0300
committerTony Lindgren <tony@atomide.com>2017-05-16 18:44:31 +0300
commite1a9e61e141d2b61780602b0af2befd7133c0bae (patch)
treecad262f71e45a473de803c2a44c79188cb479d76 /arch/arm/mach-omap2/omap-wakeupgen.c
parent2ea659a9ef488125eb46da6eb571de5eae5c43f6 (diff)
downloadlinux-e1a9e61e141d2b61780602b0af2befd7133c0bae.tar.xz
ARM: OMAP: Wakeupgen: Add context save/restore for AM43XX
AM43XX has the same wakeupgen IP as OMAP4/5. The only notable difference is the presence of 7 register banks and lack of SAR area which has been used in OMAP4/5 for saving and restoring the context around low power states. In case of AM43XX the context is saved and restored by the kernel. Introduce wakeupgen_ops so that context save and restore can be set on a per-SoC basis during init. Signed-off-by: Dave Gerlach <d-gerlach@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/mach-omap2/omap-wakeupgen.c')
-rw-r--r--arch/arm/mach-omap2/omap-wakeupgen.c68
1 files changed, 62 insertions, 6 deletions
diff --git a/arch/arm/mach-omap2/omap-wakeupgen.c b/arch/arm/mach-omap2/omap-wakeupgen.c
index 369f95a703ac..33ed5d53fa45 100644
--- a/arch/arm/mach-omap2/omap-wakeupgen.c
+++ b/arch/arm/mach-omap2/omap-wakeupgen.c
@@ -58,6 +58,17 @@ static unsigned int irq_banks = DEFAULT_NR_REG_BANKS;
static unsigned int max_irqs = DEFAULT_IRQS;
static unsigned int omap_secure_apis;
+#ifdef CONFIG_CPU_PM
+static unsigned int wakeupgen_context[MAX_NR_REG_BANKS];
+#endif
+
+struct omap_wakeupgen_ops {
+ void (*save_context)(void);
+ void (*restore_context)(void);
+};
+
+static struct omap_wakeupgen_ops *wakeupgen_ops;
+
/*
* Static helper functions.
*/
@@ -264,6 +275,16 @@ static inline void omap5_irq_save_context(void)
}
+static inline void am43xx_irq_save_context(void)
+{
+ u32 i;
+
+ for (i = 0; i < irq_banks; i++) {
+ wakeupgen_context[i] = wakeupgen_readl(i, 0);
+ wakeupgen_writel(0, i, CPU0_ID);
+ }
+}
+
/*
* Save WakeupGen interrupt context in SAR BANK3. Restore is done by
* ROM code. WakeupGen IP is integrated along with GIC to manage the
@@ -280,11 +301,8 @@ static void irq_save_context(void)
if (!sar_base)
sar_base = omap4_get_sar_ram_base();
-
- if (soc_is_omap54xx())
- omap5_irq_save_context();
- else
- omap4_irq_save_context();
+ if (wakeupgen_ops && wakeupgen_ops->save_context)
+ wakeupgen_ops->save_context();
}
/*
@@ -306,6 +324,20 @@ static void irq_sar_clear(void)
writel_relaxed(val, sar_base + offset);
}
+static void am43xx_irq_restore_context(void)
+{
+ u32 i;
+
+ for (i = 0; i < irq_banks; i++)
+ wakeupgen_writel(wakeupgen_context[i], i, CPU0_ID);
+}
+
+static void irq_restore_context(void)
+{
+ if (wakeupgen_ops && wakeupgen_ops->restore_context)
+ wakeupgen_ops->restore_context();
+}
+
/*
* Save GIC and Wakeupgen interrupt context using secure API
* for HS/EMU devices.
@@ -319,6 +351,26 @@ static void irq_save_secure_context(void)
if (ret != API_HAL_RET_VALUE_OK)
pr_err("GIC and Wakeupgen context save failed\n");
}
+
+/* Define ops for context save and restore for each SoC */
+static struct omap_wakeupgen_ops omap4_wakeupgen_ops = {
+ .save_context = omap4_irq_save_context,
+ .restore_context = irq_sar_clear,
+};
+
+static struct omap_wakeupgen_ops omap5_wakeupgen_ops = {
+ .save_context = omap5_irq_save_context,
+ .restore_context = irq_sar_clear,
+};
+
+static struct omap_wakeupgen_ops am43xx_wakeupgen_ops = {
+ .save_context = am43xx_irq_save_context,
+ .restore_context = am43xx_irq_restore_context,
+};
+#else
+static struct omap_wakeupgen_ops omap4_wakeupgen_ops = {};
+static struct omap_wakeupgen_ops omap5_wakeupgen_ops = {};
+static struct omap_wakeupgen_ops am43xx_wakeupgen_ops = {};
#endif
#ifdef CONFIG_HOTPLUG_CPU
@@ -359,7 +411,7 @@ static int irq_notifier(struct notifier_block *self, unsigned long cmd, void *v)
break;
case CPU_CLUSTER_PM_EXIT:
if (omap_type() == OMAP2_DEVICE_TYPE_GP)
- irq_sar_clear();
+ irq_restore_context();
break;
}
return NOTIFY_OK;
@@ -494,9 +546,13 @@ static int __init wakeupgen_init(struct device_node *node,
irq_banks = OMAP4_NR_BANKS;
max_irqs = OMAP4_NR_IRQS;
omap_secure_apis = 1;
+ wakeupgen_ops = &omap4_wakeupgen_ops;
+ } else if (soc_is_omap54xx()) {
+ wakeupgen_ops = &omap5_wakeupgen_ops;
} else if (soc_is_am43xx()) {
irq_banks = AM43XX_NR_REG_BANKS;
max_irqs = AM43XX_IRQS;
+ wakeupgen_ops = &am43xx_wakeupgen_ops;
}
domain = irq_domain_add_hierarchy(parent_domain, 0, max_irqs,