ARM: qcom: Add SMP support for KPSSv1

Implement support for the Krait CPU release sequence when the
CPUs are part of the first version of the krait processor
subsystem.

Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Kumar Gala <galak@codeaurora.org>

2 files changed, 111 insertions, 3 deletions

diff --git a/arch/arm/mach-qcom/platsmp.c b/arch/arm/mach-qcom/platsmp.c
index ec8604d6dfb5..cb0783f3ed75 100644
--- a/arch/arm/mach-qcom/platsmp.c
+++ b/arch/arm/mach-qcom/platsmp.c
@@ -26,6 +26,16 @@
 #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 APCS_SAW2_VCTL          0x14
+
 extern void secondary_startup(void);
 
 static DEFINE_SPINLOCK(boot_lock);
@@ -71,6 +81,85 @@ static int scss_release_secondary(unsigned int cpu)
         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 DEFINE_PER_CPU(int, cold_boot_done);
 
 static int qcom_boot_secondary(unsigned int cpu, int (*func)(unsigned int))
@@ -110,6 +199,11 @@ 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 void __init qcom_smp_prepare_cpus(unsigned int max_cpus)
 {
         int cpu, map;
@@ -117,6 +211,8 @@ static void __init qcom_smp_prepare_cpus(unsigned int max_cpus)
         static const int cold_boot_flags[] = {
                 0,
                 SCM_FLAG_COLDBOOT_CPU1,
+                SCM_FLAG_COLDBOOT_CPU2,
+                SCM_FLAG_COLDBOOT_CPU3,
         };
 
         for_each_present_cpu(cpu) {
@@ -147,3 +243,13 @@ static struct smp_operations smp_msm8660_ops __initdata = {
 #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);
diff --git a/arch/arm/mach-qcom/scm-boot.h b/arch/arm/mach-qcom/scm-boot.h
index 7be32ff5d687..6aabb2428176 100644
--- a/arch/arm/mach-qcom/scm-boot.h
+++ b/arch/arm/mach-qcom/scm-boot.h
@@ -13,9 +13,11 @@
 #define __MACH_SCM_BOOT_H
 
 #define SCM_BOOT_ADDR                   0x1
-#define SCM_FLAG_COLDBOOT_CPU1          0x1
-#define SCM_FLAG_WARMBOOT_CPU1          0x2
-#define SCM_FLAG_WARMBOOT_CPU0          0x4
+#define SCM_FLAG_COLDBOOT_CPU1          0x01
+#define SCM_FLAG_COLDBOOT_CPU2          0x08
+#define SCM_FLAG_COLDBOOT_CPU3          0x20
+#define SCM_FLAG_WARMBOOT_CPU0          0x04
+#define SCM_FLAG_WARMBOOT_CPU1          0x02
 
 int scm_set_boot_addr(phys_addr_t addr, int flags);