1 files changed, 378 insertions, 0 deletions
diff --git a/arch/arm/mach-qcom/platsmp.c b/arch/arm/mach-qcom/platsmp.c
new file mode 100644
index 000000000000..d6908569ecaf
--- /dev/null
+++ b/arch/arm/mach-qcom/platsmp.c
@@ -0,0 +1,378 @@
+/*
+ *  Copyright (C) 2002 ARM Ltd.
+ *  All Rights Reserved
+ *  Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ *  Copyright (c) 2014 The Linux Foundation. All rights reserved.
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/smp.h>
+#include <linux/io.h>
+
+#include <asm/smp_plat.h>
+
+#include "scm-boot.h"
+
+#define VDD_SC1_ARRAY_CLAMP_GFS_CTL	0x35a0
+#define SCSS_CPU1CORE_RESET		0x2d80
+#define SCSS_DBG_STATUS_CORE_PWRDUP	0x2e64
+
+#define APCS_CPU_PWR_CTL	0x04
+#define PLL_CLAMP		BIT(8)
+#define CORE_PWRD_UP		BIT(7)
+#define COREPOR_RST		BIT(5)
+#define CORE_RST		BIT(4)
+#define L2DT_SLP		BIT(3)
+#define CLAMP			BIT(0)
+
+#define APC_PWR_GATE_CTL	0x14
+#define BHS_CNT_SHIFT		24
+#define LDO_PWR_DWN_SHIFT	16
+#define LDO_BYP_SHIFT		8
+#define BHS_SEG_SHIFT		1
+#define BHS_EN			BIT(0)
+
+#define APCS_SAW2_VCTL		0x14
+#define APCS_SAW2_2_VCTL	0x1c
+
+extern void secondary_startup(void);
+
+static DEFINE_SPINLOCK(boot_lock);
+
+#ifdef CONFIG_HOTPLUG_CPU
+static void __ref qcom_cpu_die(unsigned int cpu)
+{
+	wfi();
+}
+#endif
+
+static void qcom_secondary_init(unsigned int cpu)
+{
+	/*
+	 * Synchronise with the boot thread.
+	 */
+	spin_lock(&boot_lock);
+	spin_unlock(&boot_lock);
+}
+
+static int scss_release_secondary(unsigned int cpu)
+{
+	struct device_node *node;
+	void __iomem *base;
+
+	node = of_find_compatible_node(NULL, NULL, "qcom,gcc-msm8660");
+	if (!node) {
+		pr_err("%s: can't find node\n", __func__);
+		return -ENXIO;
+	}
+
+	base = of_iomap(node, 0);
+	of_node_put(node);
+	if (!base)
+		return -ENOMEM;
+
+	writel_relaxed(0, base + VDD_SC1_ARRAY_CLAMP_GFS_CTL);
+	writel_relaxed(0, base + SCSS_CPU1CORE_RESET);
+	writel_relaxed(3, base + SCSS_DBG_STATUS_CORE_PWRDUP);
+	mb();
+	iounmap(base);
+
+	return 0;
+}
+
+static int kpssv1_release_secondary(unsigned int cpu)
+{
+	int ret = 0;
+	void __iomem *reg, *saw_reg;
+	struct device_node *cpu_node, *acc_node, *saw_node;
+	u32 val;
+
+	cpu_node = of_get_cpu_node(cpu, NULL);
+	if (!cpu_node)
+		return -ENODEV;
+
+	acc_node = of_parse_phandle(cpu_node, "qcom,acc", 0);
+	if (!acc_node) {
+		ret = -ENODEV;
+		goto out_acc;
+	}
+
+	saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
+	if (!saw_node) {
+		ret = -ENODEV;
+		goto out_saw;
+	}
+
+	reg = of_iomap(acc_node, 0);
+	if (!reg) {
+		ret = -ENOMEM;
+		goto out_acc_map;
+	}
+
+	saw_reg = of_iomap(saw_node, 0);
+	if (!saw_reg) {
+		ret = -ENOMEM;
+		goto out_saw_map;
+	}
+
+	/* Turn on CPU rail */
+	writel_relaxed(0xA4, saw_reg + APCS_SAW2_VCTL);
+	mb();
+	udelay(512);
+
+	/* Krait bring-up sequence */
+	val = PLL_CLAMP | L2DT_SLP | CLAMP;
+	writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
+	val &= ~L2DT_SLP;
+	writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
+	mb();
+	ndelay(300);
+
+	val |= COREPOR_RST;
+	writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
+	mb();
+	udelay(2);
+
+	val &= ~CLAMP;
+	writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
+	mb();
+	udelay(2);
+
+	val &= ~COREPOR_RST;
+	writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
+	mb();
+	udelay(100);
+
+	val |= CORE_PWRD_UP;
+	writel_relaxed(val, reg + APCS_CPU_PWR_CTL);
+	mb();
+
+	iounmap(saw_reg);
+out_saw_map:
+	iounmap(reg);
+out_acc_map:
+	of_node_put(saw_node);
+out_saw:
+	of_node_put(acc_node);
+out_acc:
+	of_node_put(cpu_node);
+	return ret;
+}
+
+static int kpssv2_release_secondary(unsigned int cpu)
+{
+	void __iomem *reg;
+	struct device_node *cpu_node, *l2_node, *acc_node, *saw_node;
+	void __iomem *l2_saw_base;
+	unsigned reg_val;
+	int ret;
+
+	cpu_node = of_get_cpu_node(cpu, NULL);
+	if (!cpu_node)
+		return -ENODEV;
+
+	acc_node = of_parse_phandle(cpu_node, "qcom,acc", 0);
+	if (!acc_node) {
+		ret = -ENODEV;
+		goto out_acc;
+	}
+
+	l2_node = of_parse_phandle(cpu_node, "next-level-cache", 0);
+	if (!l2_node) {
+		ret = -ENODEV;
+		goto out_l2;
+	}
+
+	saw_node = of_parse_phandle(l2_node, "qcom,saw", 0);
+	if (!saw_node) {
+		ret = -ENODEV;
+		goto out_saw;
+	}
+
+	reg = of_iomap(acc_node, 0);
+	if (!reg) {
+		ret = -ENOMEM;
+		goto out_map;
+	}
+
+	l2_saw_base = of_iomap(saw_node, 0);
+	if (!l2_saw_base) {
+		ret = -ENOMEM;
+		goto out_saw_map;
+	}
+
+	/* Turn on the BHS, turn off LDO Bypass and power down LDO */
+	reg_val = (64 << BHS_CNT_SHIFT) | (0x3f << LDO_PWR_DWN_SHIFT) | BHS_EN;
+	writel_relaxed(reg_val, reg + APC_PWR_GATE_CTL);
+	mb();
+	/* wait for the BHS to settle */
+	udelay(1);
+
+	/* Turn on BHS segments */
+	reg_val |= 0x3f << BHS_SEG_SHIFT;
+	writel_relaxed(reg_val, reg + APC_PWR_GATE_CTL);
+	mb();
+	 /* wait for the BHS to settle */
+	udelay(1);
+
+	/* Finally turn on the bypass so that BHS supplies power */
+	reg_val |= 0x3f << LDO_BYP_SHIFT;
+	writel_relaxed(reg_val, reg + APC_PWR_GATE_CTL);
+
+	/* enable max phases */
+	writel_relaxed(0x10003, l2_saw_base + APCS_SAW2_2_VCTL);
+	mb();
+	udelay(50);
+
+	reg_val = COREPOR_RST | CLAMP;
+	writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
+	mb();
+	udelay(2);
+
+	reg_val &= ~CLAMP;
+	writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
+	mb();
+	udelay(2);
+
+	reg_val &= ~COREPOR_RST;
+	writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
+	mb();
+
+	reg_val |= CORE_PWRD_UP;
+	writel_relaxed(reg_val, reg + APCS_CPU_PWR_CTL);
+	mb();
+
+	ret = 0;
+
+	iounmap(l2_saw_base);
+out_saw_map:
+	iounmap(reg);
+out_map:
+	of_node_put(saw_node);
+out_saw:
+	of_node_put(l2_node);
+out_l2:
+	of_node_put(acc_node);
+out_acc:
+	of_node_put(cpu_node);
+
+	return ret;
+}
+
+static DEFINE_PER_CPU(int, cold_boot_done);
+
+static int qcom_boot_secondary(unsigned int cpu, int (*func)(unsigned int))
+{
+	int ret = 0;
+
+	if (!per_cpu(cold_boot_done, cpu)) {
+		ret = func(cpu);
+		if (!ret)
+			per_cpu(cold_boot_done, cpu) = true;
+	}
+
+	/*
+	 * set synchronisation state between this boot processor
+	 * and the secondary one
+	 */
+	spin_lock(&boot_lock);
+
+	/*
+	 * Send the secondary CPU a soft interrupt, thereby causing
+	 * the boot monitor to read the system wide flags register,
+	 * and branch to the address found there.
+	 */
+	arch_send_wakeup_ipi_mask(cpumask_of(cpu));
+
+	/*
+	 * now the secondary core is starting up let it run its
+	 * calibrations, then wait for it to finish
+	 */
+	spin_unlock(&boot_lock);
+
+	return ret;
+}
+
+static int msm8660_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+	return qcom_boot_secondary(cpu, scss_release_secondary);
+}
+
+static int kpssv1_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+	return qcom_boot_secondary(cpu, kpssv1_release_secondary);
+}
+
+static int kpssv2_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+	return qcom_boot_secondary(cpu, kpssv2_release_secondary);
+}
+
+static void __init qcom_smp_prepare_cpus(unsigned int max_cpus)
+{
+	int cpu, map;
+	unsigned int flags = 0;
+	static const int cold_boot_flags[] = {
+		0,
+		SCM_FLAG_COLDBOOT_CPU1,
+		SCM_FLAG_COLDBOOT_CPU2,
+		SCM_FLAG_COLDBOOT_CPU3,
+	};
+
+	for_each_present_cpu(cpu) {
+		map = cpu_logical_map(cpu);
+		if (WARN_ON(map >= ARRAY_SIZE(cold_boot_flags))) {
+			set_cpu_present(cpu, false);
+			continue;
+		}
+		flags |= cold_boot_flags[map];
+	}
+
+	if (scm_set_boot_addr(virt_to_phys(secondary_startup), flags)) {
+		for_each_present_cpu(cpu) {
+			if (cpu == smp_processor_id())
+				continue;
+			set_cpu_present(cpu, false);
+		}
+		pr_warn("Failed to set CPU boot address, disabling SMP\n");
+	}
+}
+
+static struct smp_operations smp_msm8660_ops __initdata = {
+	.smp_prepare_cpus	= qcom_smp_prepare_cpus,
+	.smp_secondary_init	= qcom_secondary_init,
+	.smp_boot_secondary	= msm8660_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+	.cpu_die		= qcom_cpu_die,
+#endif
+};
+CPU_METHOD_OF_DECLARE(qcom_smp, "qcom,gcc-msm8660", &smp_msm8660_ops);
+
+static struct smp_operations qcom_smp_kpssv1_ops __initdata = {
+	.smp_prepare_cpus	= qcom_smp_prepare_cpus,
+	.smp_secondary_init	= qcom_secondary_init,
+	.smp_boot_secondary	= kpssv1_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+	.cpu_die		= qcom_cpu_die,
+#endif
+};
+CPU_METHOD_OF_DECLARE(qcom_smp_kpssv1, "qcom,kpss-acc-v1", &qcom_smp_kpssv1_ops);
+
+static struct smp_operations qcom_smp_kpssv2_ops __initdata = {
+	.smp_prepare_cpus	= qcom_smp_prepare_cpus,
+	.smp_secondary_init	= qcom_secondary_init,
+	.smp_boot_secondary	= kpssv2_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+	.cpu_die		= qcom_cpu_die,
+#endif
+};
+CPU_METHOD_OF_DECLARE(qcom_smp_kpssv2, "qcom,kpss-acc-v2", &qcom_smp_kpssv2_ops);