ARM: mediatek: add smp bringup code

Add support for booting secondary CPUs on mt6589, mt8127
and mt8135.
Signed-off-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm/mach-mediatek/Makefile

+ifeq ($(CONFIG_SMP),y)
+obj-$(CONFIG_ARCH_MEDIATEK) += platsmp.o
+endif
 obj-$(CONFIG_ARCH_MEDIATEK) += mediatek.o

arch/arm/mach-mediatek/platsmp.c

+/*
+ * arch/arm/mach-mediatek/platsmp.c
+ *
+ * Copyright (c) 2014 Mediatek Inc.
+ * Author: Shunli Wang <shunli.wang@mediatek.com>
+ *         Yingjoe Chen <yingjoe.chen@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <linux/io.h>
+#include <linux/memblock.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/string.h>
+#include <linux/threads.h>
+
+#define MTK_MAX_CPU		8
+#define MTK_SMP_REG_SIZE	0x1000
+
+struct mtk_smp_boot_info {
+	unsigned long smp_base;
+	unsigned int jump_reg;
+	unsigned int core_keys[MTK_MAX_CPU - 1];
+	unsigned int core_regs[MTK_MAX_CPU - 1];
+};
+
+static const struct mtk_smp_boot_info mtk_mt8135_tz_boot = {
+	0x80002000, 0x3fc,
+	{ 0x534c4131, 0x4c415332, 0x41534c33 },
+	{ 0x3f8, 0x3f8, 0x3f8 },
+};
+
+static const struct mtk_smp_boot_info mtk_mt6589_boot = {
+	0x10002000, 0x34,
+	{ 0x534c4131, 0x4c415332, 0x41534c33 },
+	{ 0x38, 0x3c, 0x40 },
+};
+
+static const struct of_device_id mtk_tz_smp_boot_infos[] __initconst = {
+	{ .compatible   = "mediatek,mt8135", .data = &mtk_mt8135_tz_boot },
+	{ .compatible   = "mediatek,mt8127", .data = &mtk_mt8135_tz_boot },
+};
+
+static const struct of_device_id mtk_smp_boot_infos[] __initconst = {
+	{ .compatible   = "mediatek,mt6589", .data = &mtk_mt6589_boot },
+};
+
+static void __iomem *mtk_smp_base;
+static const struct mtk_smp_boot_info *mtk_smp_info;
+
+static int mtk_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+	if (!mtk_smp_base)
+		return -EINVAL;
+
+	if (!mtk_smp_info->core_keys[cpu-1])
+		return -EINVAL;
+
+	writel_relaxed(mtk_smp_info->core_keys[cpu-1],
+		mtk_smp_base + mtk_smp_info->core_regs[cpu-1]);
+
+	arch_send_wakeup_ipi_mask(cpumask_of(cpu));
+
+	return 0;
+}
+
+static void __init __mtk_smp_prepare_cpus(unsigned int max_cpus, int trustzone)
+{
+	int i, num;
+	const struct of_device_id *infos;
+
+	if (trustzone) {
+		num = ARRAY_SIZE(mtk_tz_smp_boot_infos);
+		infos = mtk_tz_smp_boot_infos;
+	} else {
+		num = ARRAY_SIZE(mtk_smp_boot_infos);
+		infos = mtk_smp_boot_infos;
+	}
+
+	/* Find smp boot info for this SoC */
+	for (i = 0; i < num; i++) {
+		if (of_machine_is_compatible(infos[i].compatible)) {
+			mtk_smp_info = infos[i].data;
+			break;
+		}
+	}
+
+	if (!mtk_smp_info) {
+		pr_err("%s: Device is not supported\n", __func__);
+		return;
+	}
+
+	if (trustzone) {
+		/* smp_base(trustzone-bootinfo) is reserved by device tree */
+		mtk_smp_base = phys_to_virt(mtk_smp_info->smp_base);
+	} else {
+		mtk_smp_base = ioremap(mtk_smp_info->smp_base, MTK_SMP_REG_SIZE);
+		if (!mtk_smp_base) {
+			pr_err("%s: Can't remap %lx\n", __func__,
+				mtk_smp_info->smp_base);
+			return;
+		}
+	}
+
+	/*
+	 * write the address of slave startup address into the system-wide
+	 * jump register
+	 */
+	writel_relaxed(virt_to_phys(secondary_startup_arm),
+			mtk_smp_base + mtk_smp_info->jump_reg);
+}
+
+static void __init mtk_tz_smp_prepare_cpus(unsigned int max_cpus)
+{
+	__mtk_smp_prepare_cpus(max_cpus, 1);
+}
+
+static void __init mtk_smp_prepare_cpus(unsigned int max_cpus)
+{
+	__mtk_smp_prepare_cpus(max_cpus, 0);
+}
+
+static struct smp_operations mt81xx_tz_smp_ops __initdata = {
+	.smp_prepare_cpus = mtk_tz_smp_prepare_cpus,
+	.smp_boot_secondary = mtk_boot_secondary,
+};
+CPU_METHOD_OF_DECLARE(mt81xx_tz_smp, "mediatek,mt81xx-tz-smp", &mt81xx_tz_smp_ops);
+
+static struct smp_operations mt6589_smp_ops __initdata = {
+	.smp_prepare_cpus = mtk_smp_prepare_cpus,
+	.smp_boot_secondary = mtk_boot_secondary,
+};
+CPU_METHOD_OF_DECLARE(mt6589_smp, "mediatek,mt6589-smp", &mt6589_smp_ops);