ARM: exynos: Re-introduce Exynos4212 support

Support for the Exynos4212 SoC was originally dropped as there were
no boards using it. We will be adding a device that uses it, so add
back the relevant code.

This reverts commit 9e43eca.

Signed-off-by: Artur Weber <aweber.kernel@gmail.com>
Link: https://lore.kernel.org/r/20230501195525.6268-4-aweber.kernel@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Author: refractionware

arch/arm/mach-exynos/Kconfig

@@ -78,6 +78,11 @@ config CPU_EXYNOS4210
 	default y
 	depends on ARCH_EXYNOS4
 
+config SOC_EXYNOS4212
+	bool "Samsung Exynos4212"
+	default y
+	depends on ARCH_EXYNOS4
+
 config SOC_EXYNOS4412
 	bool "Samsung Exynos4412"
 	default y

arch/arm/mach-exynos/common.h

@@ -15,6 +15,7 @@
 #define EXYNOS3_SOC_MASK	0xFFFFF000
 
 #define EXYNOS4210_CPU_ID	0x43210000
+#define EXYNOS4212_CPU_ID	0x43220000
 #define EXYNOS4412_CPU_ID	0xE4412200
 #define EXYNOS4_CPU_MASK	0xFFFE0000
 
@@ -34,6 +35,7 @@ static inline int is_samsung_##name(void)	\
 
 IS_SAMSUNG_CPU(exynos3250, EXYNOS3250_SOC_ID, EXYNOS3_SOC_MASK)
 IS_SAMSUNG_CPU(exynos4210, EXYNOS4210_CPU_ID, EXYNOS4_CPU_MASK)
+IS_SAMSUNG_CPU(exynos4212, EXYNOS4212_CPU_ID, EXYNOS4_CPU_MASK)
 IS_SAMSUNG_CPU(exynos4412, EXYNOS4412_CPU_ID, EXYNOS4_CPU_MASK)
 IS_SAMSUNG_CPU(exynos5250, EXYNOS5250_SOC_ID, EXYNOS5_SOC_MASK)
 IS_SAMSUNG_CPU(exynos5410, EXYNOS5410_SOC_ID, EXYNOS5_SOC_MASK)
@@ -52,6 +54,12 @@ IS_SAMSUNG_CPU(exynos5800, EXYNOS5800_SOC_ID, EXYNOS5_SOC_MASK)
 # define soc_is_exynos4210()	0
 #endif
 
+#if defined(CONFIG_SOC_EXYNOS4212)
+# define soc_is_exynos4212()	is_samsung_exynos4212()
+#else
+# define soc_is_exynos4212()	0
+#endif
+
 #if defined(CONFIG_SOC_EXYNOS4412)
 # define soc_is_exynos4412()	is_samsung_exynos4412()
 #else

arch/arm/mach-exynos/exynos.c

@@ -180,6 +180,7 @@ static void __init exynos_dt_machine_init(void)
 		exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
 #endif
 	if (of_machine_is_compatible("samsung,exynos4210") ||
+	    of_machine_is_compatible("samsung,exynos4212") ||
 	    (of_machine_is_compatible("samsung,exynos4412") &&
 	     (of_machine_is_compatible("samsung,trats2") ||
 		  of_machine_is_compatible("samsung,midas") ||
@@ -194,6 +195,7 @@ static char const *const exynos_dt_compat[] __initconst = {
 	"samsung,exynos3250",
 	"samsung,exynos4",
 	"samsung,exynos4210",
+	"samsung,exynos4212",
 	"samsung,exynos4412",
 	"samsung,exynos5",
 	"samsung,exynos5250",

arch/arm/mach-exynos/firmware.c

@@ -63,12 +63,18 @@ static int exynos_cpu_boot(int cpu)
 	 *
 	 * On Exynos5 devices the call is ignored by trustzone firmware.
 	 */
-	if (!soc_is_exynos4210() && !soc_is_exynos4412())
+	if (!soc_is_exynos4210() && !soc_is_exynos4212() &&
+	    !soc_is_exynos4412())
 		return 0;
 
 	/*
 	 * The second parameter of SMC_CMD_CPU1BOOT command means CPU id.
+	 * But, Exynos4212 has only one secondary CPU so second parameter
+	 * isn't used for informing secure firmware about CPU id.
 	 */
+	if (soc_is_exynos4212())
+		cpu = 0;
+
 	exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
 	return 0;
 }

arch/arm/mach-exynos/pm.c

@@ -161,7 +161,7 @@ void exynos_enter_aftr(void)
 
 	exynos_pm_central_suspend();
 
-	if (soc_is_exynos4412()) {
+	if (soc_is_exynos4212() || soc_is_exynos4412()) {
 		/* Setting SEQ_OPTION register */
 		pmu_raw_writel(S5P_USE_STANDBY_WFI0 | S5P_USE_STANDBY_WFE0,
 			       S5P_CENTRAL_SEQ_OPTION);

arch/arm/mach-exynos/suspend.c

@@ -231,6 +231,7 @@ static int __init exynos_pmu_irq_init(struct device_node *node,
 
 EXYNOS_PMU_IRQ(exynos3250_pmu_irq, "samsung,exynos3250-pmu");
 EXYNOS_PMU_IRQ(exynos4210_pmu_irq, "samsung,exynos4210-pmu");
+EXYNOS_PMU_IRQ(exynos4212_pmu_irq, "samsung,exynos4212-pmu");
 EXYNOS_PMU_IRQ(exynos4412_pmu_irq, "samsung,exynos4412-pmu");
 EXYNOS_PMU_IRQ(exynos5250_pmu_irq, "samsung,exynos5250-pmu");
 EXYNOS_PMU_IRQ(exynos5420_pmu_irq, "samsung,exynos5420-pmu");
@@ -640,6 +641,9 @@ static const struct of_device_id exynos_pmu_of_device_ids[] __initconst = {
 	}, {
 		.compatible = "samsung,exynos4210-pmu",
 		.data = &exynos4_pm_data,
+	}, {
+		.compatible = "samsung,exynos4212-pmu",
+		.data = &exynos4_pm_data,
 	}, {
 		.compatible = "samsung,exynos4412-pmu",
 		.data = &exynos4_pm_data,