ARM: EXYNOS: Map SYSRAM through generic DT bindings

Instead of hardcoding the SYSRAM details for each SoC,
pass this information through device tree (DT) and make
the code SoC agnostic. Generic DT SRAM bindings are
used for achieving this.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

5 files changed, 60 insertions, 76 deletions

diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
index 9ef3f83efaf..963c51fb606 100644
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -18,6 +18,7 @@
 void mct_init(void __iomem *base, int irq_g0, int irq_l0, int irq_l1);
 
 struct map_desc;
+extern void __iomem *sysram_ns_base_addr;
 void exynos_init_io(void);
 void exynos_restart(enum reboot_mode mode, const char *cmd);
 void exynos_cpuidle_init(void);
diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c
index b32a907d021..e973ff5de7b 100644
--- a/arch/arm/mach-exynos/exynos.c
+++ b/arch/arm/mach-exynos/exynos.c
@@ -114,51 +114,6 @@ static struct map_desc exynos4_iodesc[] __initdata = {
 	},
 };
 
-static struct map_desc exynos4_iodesc0[] __initdata = {
-	{
-		.virtual	= (unsigned long)S5P_VA_SYSRAM,
-		.pfn		= __phys_to_pfn(EXYNOS4_PA_SYSRAM0),
-		.length		= SZ_4K,
-		.type		= MT_DEVICE,
-	},
-};
-
-static struct map_desc exynos4_iodesc1[] __initdata = {
-	{
-		.virtual	= (unsigned long)S5P_VA_SYSRAM,
-		.pfn		= __phys_to_pfn(EXYNOS4_PA_SYSRAM1),
-		.length		= SZ_4K,
-		.type		= MT_DEVICE,
-	},
-};
-
-static struct map_desc exynos4210_iodesc[] __initdata = {
-	{
-		.virtual	= (unsigned long)S5P_VA_SYSRAM_NS,
-		.pfn		= __phys_to_pfn(EXYNOS4210_PA_SYSRAM_NS),
-		.length		= SZ_4K,
-		.type		= MT_DEVICE,
-	},
-};
-
-static struct map_desc exynos4x12_iodesc[] __initdata = {
-	{
-		.virtual	= (unsigned long)S5P_VA_SYSRAM_NS,
-		.pfn		= __phys_to_pfn(EXYNOS4x12_PA_SYSRAM_NS),
-		.length		= SZ_4K,
-		.type		= MT_DEVICE,
-	},
-};
-
-static struct map_desc exynos5250_iodesc[] __initdata = {
-	{
-		.virtual	= (unsigned long)S5P_VA_SYSRAM_NS,
-		.pfn		= __phys_to_pfn(EXYNOS5250_PA_SYSRAM_NS),
-		.length		= SZ_4K,
-		.type		= MT_DEVICE,
-	},
-};
-
 static struct map_desc exynos5_iodesc[] __initdata = {
 	{
 		.virtual	= (unsigned long)S3C_VA_SYS,
@@ -181,11 +136,6 @@ static struct map_desc exynos5_iodesc[] __initdata = {
 		.length		= SZ_4K,
 		.type		= MT_DEVICE,
 	}, {
-		.virtual	= (unsigned long)S5P_VA_SYSRAM,
-		.pfn		= __phys_to_pfn(EXYNOS5_PA_SYSRAM),
-		.length		= SZ_4K,
-		.type		= MT_DEVICE,
-	}, {
 		.virtual	= (unsigned long)S5P_VA_CMU,
 		.pfn		= __phys_to_pfn(EXYNOS5_PA_CMU),
 		.length		= 144 * SZ_1K,
@@ -280,20 +230,6 @@ static void __init exynos_map_io(void)
 
 	if (soc_is_exynos5())
 		iotable_init(exynos5_iodesc, ARRAY_SIZE(exynos5_iodesc));
-
-	if (soc_is_exynos4210()) {
-		if (samsung_rev() == EXYNOS4210_REV_0)
-			iotable_init(exynos4_iodesc0,
-						ARRAY_SIZE(exynos4_iodesc0));
-		else
-			iotable_init(exynos4_iodesc1,
-						ARRAY_SIZE(exynos4_iodesc1));
-		iotable_init(exynos4210_iodesc, ARRAY_SIZE(exynos4210_iodesc));
-	}
-	if (soc_is_exynos4212() || soc_is_exynos4412())
-		iotable_init(exynos4x12_iodesc, ARRAY_SIZE(exynos4x12_iodesc));
-	if (soc_is_exynos5250())
-		iotable_init(exynos5250_iodesc, ARRAY_SIZE(exynos5250_iodesc));
 }
 
 void __init exynos_init_io(void)
diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-exynos/firmware.c
index 932129ef26c..483dfcd6906 100644
--- a/arch/arm/mach-exynos/firmware.c
+++ b/arch/arm/mach-exynos/firmware.c
@@ -18,6 +18,7 @@
 
 #include <mach/map.h>
 
+#include "common.h"
 #include "smc.h"
 
 static int exynos_do_idle(void)
@@ -34,7 +35,12 @@ static int exynos_cpu_boot(int cpu)
 
 static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
 {
-	void __iomem *boot_reg = S5P_VA_SYSRAM_NS + 0x1c + 4*cpu;
+	void __iomem *boot_reg;
+
+	if (!sysram_ns_base_addr)
+		return -ENODEV;
+
+	boot_reg = sysram_ns_base_addr + 0x1c + 4*cpu;
 
 	__raw_writel(boot_addr, boot_reg);
 	return 0;
diff --git a/arch/arm/mach-exynos/include/mach/map.h b/arch/arm/mach-exynos/include/mach/map.h
index 7b046b59d9e..548269a6063 100644
--- a/arch/arm/mach-exynos/include/mach/map.h
+++ b/arch/arm/mach-exynos/include/mach/map.h
@@ -23,13 +23,6 @@
 
 #include <plat/map-s5p.h>
 
-#define EXYNOS4_PA_SYSRAM0		0x02025000
-#define EXYNOS4_PA_SYSRAM1		0x02020000
-#define EXYNOS5_PA_SYSRAM		0x02020000
-#define EXYNOS4210_PA_SYSRAM_NS		0x0203F000
-#define EXYNOS4x12_PA_SYSRAM_NS		0x0204F000
-#define EXYNOS5250_PA_SYSRAM_NS		0x0204F000
-
 #define EXYNOS_PA_CHIPID		0x10000000
 
 #define EXYNOS4_PA_SYSCON		0x10010000
diff --git a/arch/arm/mach-exynos/platsmp.c b/arch/arm/mach-exynos/platsmp.c
index 03e5e9f9470..c11c5418e0f 100644
--- a/arch/arm/mach-exynos/platsmp.c
+++ b/arch/arm/mach-exynos/platsmp.c
@@ -20,6 +20,7 @@
 #include <linux/jiffies.h>
 #include <linux/smp.h>
 #include <linux/io.h>
+#include <linux/of_address.h>
 
 #include <asm/cacheflush.h>
 #include <asm/smp_plat.h>
@@ -33,11 +34,33 @@
 
 extern void exynos4_secondary_startup(void);
 
+static void __iomem *sysram_base_addr;
+void __iomem *sysram_ns_base_addr;
+
+static void __init exynos_smp_prepare_sysram(void)
+{
+	struct device_node *node;
+
+	for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") {
+		if (!of_device_is_available(node))
+			continue;
+		sysram_base_addr = of_iomap(node, 0);
+		break;
+	}
+
+	for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") {
+		if (!of_device_is_available(node))
+			continue;
+		sysram_ns_base_addr = of_iomap(node, 0);
+		break;
+	}
+}
+
 static inline void __iomem *cpu_boot_reg_base(void)
 {
 	if (soc_is_exynos4210() && samsung_rev() == EXYNOS4210_REV_1_1)
 		return S5P_INFORM5;
-	return S5P_VA_SYSRAM;
+	return sysram_base_addr;
 }
 
 static inline void __iomem *cpu_boot_reg(int cpu)
@@ -45,6 +68,8 @@ static inline void __iomem *cpu_boot_reg(int cpu)
 	void __iomem *boot_reg;
 
 	boot_reg = cpu_boot_reg_base();
+	if (!boot_reg)
+		return ERR_PTR(-ENODEV);
 	if (soc_is_exynos4412())
 		boot_reg += 4*cpu;
 	else if (soc_is_exynos5420())
@@ -90,6 +115,7 @@ static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle)
 {
 	unsigned long timeout;
 	unsigned long phys_cpu = cpu_logical_map(cpu);
+	int ret = -ENOSYS;
 
 	/*
 	 * Set synchronisation state between this boot processor
@@ -146,8 +172,18 @@ static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle)
 		 * Try to set boot address using firmware first
 		 * and fall back to boot register if it fails.
 		 */
-		if (call_firmware_op(set_cpu_boot_addr, phys_cpu, boot_addr))
+		ret = call_firmware_op(set_cpu_boot_addr, phys_cpu, boot_addr);
+		if (ret && ret != -ENOSYS)
+			goto fail;
+		if (ret == -ENOSYS) {
+			void __iomem *boot_reg = cpu_boot_reg(phys_cpu);
+
+			if (IS_ERR(boot_reg)) {
+				ret = PTR_ERR(boot_reg);
+				goto fail;
+			}
 			__raw_writel(boot_addr, cpu_boot_reg(phys_cpu));
+		}
 
 		call_firmware_op(cpu_boot, phys_cpu);
 
@@ -163,9 +199,10 @@ static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle)
 	 * now the secondary core is starting up let it run its
 	 * calibrations, then wait for it to finish
 	 */
+fail:
 	spin_unlock(&boot_lock);
 
-	return pen_release != -1 ? -ENOSYS : 0;
+	return pen_release != -1 ? ret : 0;
 }
 
 /*
@@ -205,6 +242,8 @@ static void __init exynos_smp_prepare_cpus(unsigned int max_cpus)
 	if (read_cpuid_part_number() == ARM_CPU_PART_CORTEX_A9)
 		scu_enable(scu_base_addr());
 
+	exynos_smp_prepare_sysram();
+
 	/*
 	 * Write the address of secondary startup into the
 	 * system-wide flags register. The boot monitor waits
@@ -217,12 +256,21 @@ static void __init exynos_smp_prepare_cpus(unsigned int max_cpus)
 	for (i = 1; i < max_cpus; ++i) {
 		unsigned long phys_cpu;
 		unsigned long boot_addr;
+		int ret;
 
 		phys_cpu = cpu_logical_map(i);
 		boot_addr = virt_to_phys(exynos4_secondary_startup);
 
-		if (call_firmware_op(set_cpu_boot_addr, phys_cpu, boot_addr))
+		ret = call_firmware_op(set_cpu_boot_addr, phys_cpu, boot_addr);
+		if (ret && ret != -ENOSYS)
+			break;
+		if (ret == -ENOSYS) {
+			void __iomem *boot_reg = cpu_boot_reg(phys_cpu);
+
+			if (IS_ERR(boot_reg))
+				break;
 			__raw_writel(boot_addr, cpu_boot_reg(phys_cpu));
+		}
 	}
 }