ARM: zx: enable SMP and hotplug for zx296702

Bring up the secondary core. Enable hotplug with supporting
powering off secondary core.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/arch/arm/mach-zx/Makefile b/arch/arm/mach-zx/Makefile
index 7a541c7..7c2edf6 100644 (file)
--- a/arch/arm/mach-zx/Makefile
+++ b/arch/arm/mach-zx/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_SOC_ZX296702) += zx296702.o
+obj-$(CONFIG_SMP) += headsmp.o platsmp.o

diff --git a/arch/arm/mach-zx/core.h b/arch/arm/mach-zx/core.h
new file mode 100644 (file)
index 0000000..3efe8e0
--- /dev/null
+++ b/arch/arm/mach-zx/core.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright 2014 Linaro Ltd.
+ * Copyright (C) 2014 ZTE Corporation.
+ *
+ * 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.
+ */
+
+#ifndef __MACH_ZX_CORE_H
+#define __MACH_ZX_CORE_H
+
+extern void zx_resume_jump(void);
+extern size_t zx_suspend_iram_sz;
+extern unsigned long zx_secondary_startup_pa;
+
+void zx_secondary_startup(void);
+
+#endif /* __MACH_ZX_CORE_H */

diff --git a/arch/arm/mach-zx/headsmp.S b/arch/arm/mach-zx/headsmp.S
new file mode 100644 (file)
index 0000000..c0fece0
--- /dev/null
+++ b/arch/arm/mach-zx/headsmp.S
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2014 Linaro Ltd.
+ * Copyright (C) 2014 ZTE Corporation.
+ *
+ * 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/linkage.h>
+
+       .align 3
+
+/* It runs from physical address */
+ENTRY(zx_resume_jump)
+       adr     r1, zx_secondary_startup_pa
+       ldr     r0, [r1]
+       bx      r0
+ENDPROC(zx_resume_jump)
+
+ENTRY(zx_secondary_startup_pa)
+       .word   zx_secondary_startup_pa
+
+ENTRY(zx_suspend_iram_sz)
+        .word  . - zx_resume_jump
+ENDPROC(zx_secondary_startup_pa)
+
+
+ENTRY(zx_secondary_startup)
+       bl      v7_invalidate_l1
+       b       secondary_startup
+ENDPROC(zx_secondary_startup)

diff --git a/arch/arm/mach-zx/platsmp.c b/arch/arm/mach-zx/platsmp.c
new file mode 100644 (file)
index 0000000..a369398
--- /dev/null
+++ b/arch/arm/mach-zx/platsmp.c
@@ -0,0 +1,189 @@
+/*
+ * Copyright 2014 Linaro Ltd.
+ * Copyright (C) 2014 ZTE Corporation.
+ *
+ * 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/delay.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/smp.h>
+
+#include <asm/cacheflush.h>
+#include <asm/cp15.h>
+#include <asm/fncpy.h>
+#include <asm/proc-fns.h>
+#include <asm/smp_scu.h>
+#include <asm/smp_plat.h>
+
+#include "core.h"
+
+#define AON_SYS_CTRL_RESERVED1         0xa8
+
+#define BUS_MATRIX_REMAP_CONFIG                0x00
+
+#define PCU_CPU0_CTRL                  0x00
+#define PCU_CPU1_CTRL                  0x04
+#define PCU_CPU1_ST                    0x0c
+#define PCU_GLOBAL_CTRL                        0x14
+#define PCU_EXPEND_CONTROL             0x34
+
+#define ZX_IRAM_BASE                   0x00200000
+
+static void __iomem *pcu_base;
+static void __iomem *matrix_base;
+static void __iomem *scu_base;
+
+void __init zx_smp_prepare_cpus(unsigned int max_cpus)
+{
+       struct device_node *np;
+       unsigned long base = 0;
+       void __iomem *aonsysctrl_base;
+       void __iomem *sys_iram;
+
+       base = scu_a9_get_base();
+       scu_base = ioremap(base, SZ_256);
+       if (!scu_base) {
+               pr_err("%s: failed to map scu\n", __func__);
+               return;
+       }
+
+       scu_enable(scu_base);
+
+       np = of_find_compatible_node(NULL, NULL, "zte,sysctrl");
+       if (!np) {
+               pr_err("%s: failed to find sysctrl node\n", __func__);
+               return;
+       }
+
+       aonsysctrl_base = of_iomap(np, 0);
+       if (!aonsysctrl_base) {
+               pr_err("%s: failed to map aonsysctrl\n", __func__);
+               of_node_put(np);
+               return;
+       }
+
+       /*
+        * Write the address of secondary startup into the
+        * system-wide flags register. The BootMonitor waits
+        * until it receives a soft interrupt, and then the
+        * secondary CPU branches to this address.
+        */
+       __raw_writel(virt_to_phys(zx_secondary_startup),
+                    aonsysctrl_base + AON_SYS_CTRL_RESERVED1);
+
+       iounmap(aonsysctrl_base);
+       of_node_put(np);
+
+       np = of_find_compatible_node(NULL, NULL, "zte,zx296702-pcu");
+       pcu_base = of_iomap(np, 0);
+       of_node_put(np);
+       WARN_ON(!pcu_base);
+
+       np = of_find_compatible_node(NULL, NULL, "zte,zx-bus-matrix");
+       matrix_base = of_iomap(np, 0);
+       of_node_put(np);
+       WARN_ON(!matrix_base);
+
+       /* Map the first 4 KB IRAM for suspend usage */
+       sys_iram = __arm_ioremap_exec(ZX_IRAM_BASE, PAGE_SIZE, false);
+       zx_secondary_startup_pa = virt_to_phys(zx_secondary_startup);
+       fncpy(sys_iram, &zx_resume_jump, zx_suspend_iram_sz);
+}
+
+static int zx_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+       static bool first_boot = true;
+
+       if (first_boot) {
+               arch_send_wakeup_ipi_mask(cpumask_of(cpu));
+               first_boot = false;
+               return 0;
+       }
+
+       /* Swap the base address mapping between IRAM and IROM */
+       writel_relaxed(0x1, matrix_base + BUS_MATRIX_REMAP_CONFIG);
+
+       /* Power on CPU1 */
+       writel_relaxed(0x0, pcu_base + PCU_CPU1_CTRL);
+
+       /* Wait for power on ack */
+       while (readl_relaxed(pcu_base + PCU_CPU1_ST) & 0x4)
+               cpu_relax();
+
+       /* Swap back the mapping of IRAM and IROM */
+       writel_relaxed(0x0, matrix_base + BUS_MATRIX_REMAP_CONFIG);
+
+       return 0;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static inline void cpu_enter_lowpower(void)
+{
+       unsigned int v;
+
+       asm volatile(
+               "mcr    p15, 0, %1, c7, c5, 0\n"
+       "       mcr     p15, 0, %1, c7, c10, 4\n"
+       /*
+        * Turn off coherency
+        */
+       "       mrc     p15, 0, %0, c1, c0, 1\n"
+       "       bic     %0, %0, %3\n"
+       "       mcr     p15, 0, %0, c1, c0, 1\n"
+       "       mrc     p15, 0, %0, c1, c0, 0\n"
+       "       bic     %0, %0, %2\n"
+       "       mcr     p15, 0, %0, c1, c0, 0\n"
+         : "=&r" (v)
+         : "r" (0), "Ir" (CR_C), "Ir" (0x40)
+         : "cc");
+}
+
+static int zx_cpu_kill(unsigned int cpu)
+{
+       unsigned long timeout = jiffies + msecs_to_jiffies(2000);
+
+       writel_relaxed(0x2, pcu_base + PCU_CPU1_CTRL);
+
+       while ((readl_relaxed(pcu_base + PCU_CPU1_ST) & 0x3) != 0x0) {
+               if (time_after(jiffies, timeout)) {
+                       pr_err("*** cpu1 poweroff timeout\n");
+                       break;
+               }
+       }
+       return 1;
+}
+
+static void zx_cpu_die(unsigned int cpu)
+{
+       scu_power_mode(scu_base, SCU_PM_POWEROFF);
+       cpu_enter_lowpower();
+
+       while (1)
+               cpu_do_idle();
+}
+#endif
+
+static void zx_secondary_init(unsigned int cpu)
+{
+       scu_power_mode(scu_base, SCU_PM_NORMAL);
+}
+
+struct smp_operations zx_smp_ops __initdata = {
+       .smp_prepare_cpus       = zx_smp_prepare_cpus,
+       .smp_secondary_init     = zx_secondary_init,
+       .smp_boot_secondary     = zx_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+       .cpu_kill               = zx_cpu_kill,
+       .cpu_die                = zx_cpu_die,
+#endif
+};
+
+CPU_METHOD_OF_DECLARE(zx_smp, "zte,zx296702-smp", &zx_smp_ops);