ARM: OMAP5: Add the WakeupGen IP updates

OMAP4 and OMAP5 share same WakeupGen IP with below few udpates on OMAP5.
- Additional 32 interrupt support is added w.r.t OMAP4 design.
- The AUX CORE boot registers are now made accessible from non-secure SW.
- SAR offset are changed and PTMSYNC* registers are removed from SAR.

Patch updates the WakeupGen code accordingly.

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

arch/arm/mach-omap2/include/mach/omap-wakeupgen.h

@@ -11,15 +11,20 @@
 #ifndef OMAP_ARCH_WAKEUPGEN_H
 #define OMAP_ARCH_WAKEUPGEN_H
 
+/* OMAP4 and OMAP5 has same base address */
+#define OMAP_WKUPGEN_BASE			0x48281000
+
 #define OMAP_WKG_CONTROL_0			0x00
 #define OMAP_WKG_ENB_A_0			0x10
 #define OMAP_WKG_ENB_B_0			0x14
 #define OMAP_WKG_ENB_C_0			0x18
 #define OMAP_WKG_ENB_D_0			0x1c
+#define OMAP_WKG_ENB_E_0			0x20
 #define OMAP_WKG_ENB_A_1			0x410
 #define OMAP_WKG_ENB_B_1			0x414
 #define OMAP_WKG_ENB_C_1			0x418
 #define OMAP_WKG_ENB_D_1			0x41c
+#define OMAP_WKG_ENB_E_1			0x420
 #define OMAP_AUX_CORE_BOOT_0			0x800
 #define OMAP_AUX_CORE_BOOT_1			0x804
 #define OMAP_PTMSYNCREQ_MASK			0xc00
@@ -28,4 +33,6 @@
 #define OMAP_TIMESTAMPCYCLEHI			0xc0c
 
 extern int __init omap_wakeupgen_init(void);
+extern void __iomem *omap_get_wakeupgen_base(void);
+extern int omap_secure_apis_support(void);
 #endif

arch/arm/mach-omap2/omap-hotplug.c

@@ -17,8 +17,10 @@
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/smp.h>
+#include <linux/io.h>
 
 #include <asm/cacheflush.h>
+#include <mach/omap-wakeupgen.h>
 
 #include "common.h"
 
@@ -35,24 +37,36 @@ int platform_cpu_kill(unsigned int cpu)
  */
 void __ref platform_cpu_die(unsigned int cpu)
 {
-	unsigned int this_cpu;
+	unsigned int boot_cpu = 0;
+	void __iomem *base = omap_get_wakeupgen_base();
 
 	flush_cache_all();
 	dsb();
 
 	/*
 	 * we're ready for shutdown now, so do it
 	 */
-	if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0)
-		pr_err("Secure clear status failed\n");
+	if (omap_secure_apis_support()) {
+		if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0)
+			pr_err("Secure clear status failed\n");
+	} else {
+		__raw_writel(0, base + OMAP_AUX_CORE_BOOT_0);
+	}
+
 
 	for (;;) {
 		/*
 		 * Enter into low power state
 		 */
 		omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF);
-		this_cpu = smp_processor_id();
-		if (omap_read_auxcoreboot0() == this_cpu) {
+
+		if (omap_secure_apis_support())
+			boot_cpu = omap_read_auxcoreboot0();
+		else
+			boot_cpu =
+				__raw_readl(base + OMAP_AUX_CORE_BOOT_0) >> 5;
+
+		if (boot_cpu == smp_processor_id()) {
 			/*
 			 * OK, proper wakeup, we're done
 			 */

arch/arm/mach-omap2/omap-smp.c

@@ -26,6 +26,8 @@
 
 #include <mach/hardware.h>
 #include <mach/omap-secure.h>
+#include <mach/omap-wakeupgen.h>
+#include <asm/cputype.h>
 
 #include "iomap.h"
 #include "common.h"
@@ -73,6 +75,8 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
 {
 	static struct clockdomain *cpu1_clkdm;
 	static bool booted;
+	void __iomem *base = omap_get_wakeupgen_base();
+
 	/*
 	 * Set synchronisation state between this boot processor
 	 * and the secondary one
@@ -85,7 +89,11 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
 	 * the AuxCoreBoot1 register is updated with cpu state
 	 * A barrier is added to ensure that write buffer is drained
 	 */
-	omap_modify_auxcoreboot0(0x200, 0xfffffdff);
+	if (omap_secure_apis_support())
+		omap_modify_auxcoreboot0(0x200, 0xfffffdff);
+	else
+		__raw_writel(0x20, base + OMAP_AUX_CORE_BOOT_0);
+
 	flush_cache_all();
 	smp_wmb();
 
@@ -124,13 +132,20 @@ 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
 	 * on secondary core once out of WFE
 	 * A barrier is added to ensure that write buffer is drained
 	 */
-	omap_auxcoreboot_addr(virt_to_phys(omap_secondary_startup));
+	if (omap_secure_apis_support())
+		omap_auxcoreboot_addr(virt_to_phys(omap_secondary_startup));
+	else
+		__raw_writel(virt_to_phys(omap5_secondary_startup),
+						base + OMAP_AUX_CORE_BOOT_1);
+
 	smp_wmb();
 
 	/*

arch/arm/mach-omap2/omap-wakeupgen.c

@@ -33,18 +33,23 @@
 #include "omap4-sar-layout.h"
 #include "common.h"
 
-#define NR_REG_BANKS		4
-#define MAX_IRQS		128
+#define MAX_NR_REG_BANKS	5
+#define MAX_IRQS		160
 #define WKG_MASK_ALL		0x00000000
 #define WKG_UNMASK_ALL		0xffffffff
 #define CPU_ENA_OFFSET		0x400
 #define CPU0_ID			0x0
 #define CPU1_ID			0x1
+#define OMAP4_NR_BANKS		4
+#define OMAP4_NR_IRQS		128
 
 static void __iomem *wakeupgen_base;
 static void __iomem *sar_base;
 static DEFINE_SPINLOCK(wakeupgen_lock);
 static unsigned int irq_target_cpu[NR_IRQS];
+static unsigned int irq_banks = MAX_NR_REG_BANKS;
+static unsigned int max_irqs = MAX_IRQS;
+static unsigned int omap_secure_apis;
 
 /*
  * Static helper functions.
@@ -146,29 +151,29 @@ static void wakeupgen_unmask(struct irq_data *d)
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
-static DEFINE_PER_CPU(u32 [NR_REG_BANKS], irqmasks);
+static DEFINE_PER_CPU(u32 [MAX_NR_REG_BANKS], irqmasks);
 
 static void _wakeupgen_save_masks(unsigned int cpu)
 {
 	u8 i;
 
-	for (i = 0; i < NR_REG_BANKS; i++)
+	for (i = 0; i < irq_banks; i++)
 		per_cpu(irqmasks, cpu)[i] = wakeupgen_readl(i, cpu);
 }
 
 static void _wakeupgen_restore_masks(unsigned int cpu)
 {
 	u8 i;
 
-	for (i = 0; i < NR_REG_BANKS; i++)
+	for (i = 0; i < irq_banks; i++)
 		wakeupgen_writel(per_cpu(irqmasks, cpu)[i], i, cpu);
 }
 
 static void _wakeupgen_set_all(unsigned int cpu, unsigned int reg)
 {
 	u8 i;
 
-	for (i = 0; i < NR_REG_BANKS; i++)
+	for (i = 0; i < irq_banks; i++)
 		wakeupgen_writel(reg, i, cpu);
 }
 
@@ -196,25 +201,14 @@ static void wakeupgen_irqmask_all(unsigned int cpu, unsigned int set)
 #endif
 
 #ifdef CONFIG_CPU_PM
-/*
- * Save WakeupGen interrupt context in SAR BANK3. Restore is done by
- * ROM code. WakeupGen IP is integrated along with GIC to manage the
- * interrupt wakeups from CPU low power states. It manages
- * masking/unmasking of Shared peripheral interrupts(SPI). So the
- * interrupt enable/disable control should be in sync and consistent
- * at WakeupGen and GIC so that interrupts are not lost.
- */
-static void irq_save_context(void)
+static inline void omap4_irq_save_context(void)
 {
 	u32 i, val;
 
 	if (omap_rev() == OMAP4430_REV_ES1_0)
 		return;
 
-	if (!sar_base)
-		sar_base = omap4_get_sar_ram_base();
-
-	for (i = 0; i < NR_REG_BANKS; i++) {
+	for (i = 0; i < irq_banks; i++) {
 		/* Save the CPUx interrupt mask for IRQ 0 to 127 */
 		val = wakeupgen_readl(i, 0);
 		sar_writel(val, WAKEUPGENENB_OFFSET_CPU0, i);
@@ -254,6 +248,53 @@ static void irq_save_context(void)
 	val = __raw_readl(sar_base + SAR_BACKUP_STATUS_OFFSET);
 	val |= SAR_BACKUP_STATUS_WAKEUPGEN;
 	__raw_writel(val, sar_base + SAR_BACKUP_STATUS_OFFSET);
+
+}
+
+static inline void omap5_irq_save_context(void)
+{
+	u32 i, val;
+
+	for (i = 0; i < irq_banks; i++) {
+		/* Save the CPUx interrupt mask for IRQ 0 to 159 */
+		val = wakeupgen_readl(i, 0);
+		sar_writel(val, OMAP5_WAKEUPGENENB_OFFSET_CPU0, i);
+		val = wakeupgen_readl(i, 1);
+		sar_writel(val, OMAP5_WAKEUPGENENB_OFFSET_CPU1, i);
+		sar_writel(0x0, OMAP5_WAKEUPGENENB_SECURE_OFFSET_CPU0, i);
+		sar_writel(0x0, OMAP5_WAKEUPGENENB_SECURE_OFFSET_CPU1, i);
+	}
+
+	/* Save AuxBoot* registers */
+	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
+	__raw_writel(val, sar_base + OMAP5_AUXCOREBOOT0_OFFSET);
+	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
+	__raw_writel(val, sar_base + OMAP5_AUXCOREBOOT1_OFFSET);
+
+	/* Set the Backup Bit Mask status */
+	val = __raw_readl(sar_base + OMAP5_SAR_BACKUP_STATUS_OFFSET);
+	val |= SAR_BACKUP_STATUS_WAKEUPGEN;
+	__raw_writel(val, sar_base + OMAP5_SAR_BACKUP_STATUS_OFFSET);
+
+}
+
+/*
+ * Save WakeupGen interrupt context in SAR BANK3. Restore is done by
+ * ROM code. WakeupGen IP is integrated along with GIC to manage the
+ * interrupt wakeups from CPU low power states. It manages
+ * masking/unmasking of Shared peripheral interrupts(SPI). So the
+ * interrupt enable/disable control should be in sync and consistent
+ * at WakeupGen and GIC so that interrupts are not lost.
+ */
+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();
 }
 
 /*
@@ -262,9 +303,14 @@ static void irq_save_context(void)
 static void irq_sar_clear(void)
 {
 	u32 val;
-	val = __raw_readl(sar_base + SAR_BACKUP_STATUS_OFFSET);
+	u32 offset = SAR_BACKUP_STATUS_OFFSET;
+
+	if (soc_is_omap54xx())
+		offset = OMAP5_SAR_BACKUP_STATUS_OFFSET;
+
+	val = __raw_readl(sar_base + offset);
 	val &= ~SAR_BACKUP_STATUS_WAKEUPGEN;
-	__raw_writel(val, sar_base + SAR_BACKUP_STATUS_OFFSET);
+	__raw_writel(val, sar_base + offset);
 }
 
 /*
@@ -336,13 +382,25 @@ static struct notifier_block irq_notifier_block = {
 
 static void __init irq_pm_init(void)
 {
-	cpu_pm_register_notifier(&irq_notifier_block);
+	/* FIXME: Remove this when MPU OSWR support is added */
+	if (!soc_is_omap54xx())
+		cpu_pm_register_notifier(&irq_notifier_block);
 }
 #else
 static void __init irq_pm_init(void)
 {}
 #endif
 
+void __iomem *omap_get_wakeupgen_base(void)
+{
+	return wakeupgen_base;
+}
+
+int omap_secure_apis_support(void)
+{
+	return omap_secure_apis;
+}
+
 /*
  * Initialise the wakeupgen module.
  */
@@ -358,12 +416,18 @@ int __init omap_wakeupgen_init(void)
 	}
 
 	/* Static mapping, never released */
-	wakeupgen_base = ioremap(OMAP44XX_WKUPGEN_BASE, SZ_4K);
+	wakeupgen_base = ioremap(OMAP_WKUPGEN_BASE, SZ_4K);
 	if (WARN_ON(!wakeupgen_base))
 		return -ENOMEM;
 
+	if (cpu_is_omap44xx()) {
+		irq_banks = OMAP4_NR_BANKS;
+		max_irqs = OMAP4_NR_IRQS;
+		omap_secure_apis = 1;
+	}
+
 	/* Clear all IRQ bitmasks at wakeupGen level */
-	for (i = 0; i < NR_REG_BANKS; i++) {
+	for (i = 0; i < irq_banks; i++) {
 		wakeupgen_writel(0, i, CPU0_ID);
 		wakeupgen_writel(0, i, CPU1_ID);
 	}
@@ -382,7 +446,7 @@ int __init omap_wakeupgen_init(void)
 	 */
 
 	/* Associate all the IRQs to boot CPU like GIC init does. */
-	for (i = 0; i < NR_IRQS; i++)
+	for (i = 0; i < max_irqs; i++)
 		irq_target_cpu[i] = boot_cpu;
 
 	irq_hotplug_init();

arch/arm/mach-omap2/omap4-sar-layout.h

@@ -12,7 +12,7 @@
 #define OMAP_ARCH_OMAP4_SAR_LAYOUT_H
 
 /*
- * SAR BANK offsets from base address OMAP44XX_SAR_RAM_BASE
+ * SAR BANK offsets from base address OMAP44XX/54XX_SAR_RAM_BASE
  */
 #define SAR_BANK1_OFFSET		0x0000
 #define SAR_BANK2_OFFSET		0x1000
@@ -47,4 +47,14 @@
 #define PTMSYNCREQ_EN_OFFSET			(SAR_BANK3_OFFSET + 0x6d0)
 #define SAR_BACKUP_STATUS_WAKEUPGEN		0x10
 
+/* WakeUpGen save restore offset from OMAP54XX_SAR_RAM_BASE */
+#define OMAP5_WAKEUPGENENB_OFFSET_CPU0		(SAR_BANK3_OFFSET + 0x8d4)
+#define OMAP5_WAKEUPGENENB_SECURE_OFFSET_CPU0	(SAR_BANK3_OFFSET + 0x8e8)
+#define OMAP5_WAKEUPGENENB_OFFSET_CPU1		(SAR_BANK3_OFFSET + 0x8fc)
+#define OMAP5_WAKEUPGENENB_SECURE_OFFSET_CPU1	(SAR_BANK3_OFFSET + 0x910)
+#define OMAP5_AUXCOREBOOT0_OFFSET		(SAR_BANK3_OFFSET + 0x924)
+#define OMAP5_AUXCOREBOOT1_OFFSET		(SAR_BANK3_OFFSET + 0x928)
+#define OMAP5_AMBA_IF_MODE_OFFSET		(SAR_BANK3_OFFSET + 0x92c)
+#define OMAP5_SAR_BACKUP_STATUS_OFFSET		(SAR_BANK3_OFFSET + 0x800)
+
 #endif