--- zzzz-none-000/linux-3.10.107/arch/arm/mach-socfpga/platsmp.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/arm/mach-socfpga/platsmp.c	2021-02-04 17:41:59.000000000 +0000
@@ -29,53 +29,68 @@
 
 #include "core.h"
 
-static int __cpuinit socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
+static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
 {
 	int trampoline_size = &secondary_trampoline_end - &secondary_trampoline;
 
-	if (cpu1start_addr) {
+	if (socfpga_cpu1start_addr) {
+		/* This will put CPU #1 into reset. */
+		writel(RSTMGR_MPUMODRST_CPU1,
+		       rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST);
+
 		memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size);
 
-		__raw_writel(virt_to_phys(socfpga_secondary_startup),
-			(sys_manager_base_addr + (cpu1start_addr & 0x000000ff)));
+		writel(virt_to_phys(secondary_startup),
+		       sys_manager_base_addr + (socfpga_cpu1start_addr & 0x000000ff));
 
 		flush_cache_all();
 		smp_wmb();
 		outer_clean_range(0, trampoline_size);
 
-		/* This will release CPU #1 out of reset.*/
-		__raw_writel(0, rst_manager_base_addr + 0x10);
+		/* This will release CPU #1 out of reset. */
+		writel(0, rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST);
 	}
 
 	return 0;
 }
 
-/*
- * Initialise the CPU possible map early - this describes the CPUs
- * which may be present or become present in the system.
- */
-static void __init socfpga_smp_init_cpus(void)
+static int socfpga_a10_boot_secondary(unsigned int cpu, struct task_struct *idle)
 {
-	unsigned int i, ncores;
+	int trampoline_size = &secondary_trampoline_end - &secondary_trampoline;
+
+	if (socfpga_cpu1start_addr) {
+		writel(RSTMGR_MPUMODRST_CPU1, rst_manager_base_addr +
+		       SOCFPGA_A10_RSTMGR_MODMPURST);
+		memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size);
 
-	ncores = scu_get_core_count(socfpga_scu_base_addr);
+		writel(virt_to_phys(secondary_startup),
+		       sys_manager_base_addr + (socfpga_cpu1start_addr & 0x00000fff));
 
-	for (i = 0; i < ncores; i++)
-		set_cpu_possible(i, true);
+		flush_cache_all();
+		smp_wmb();
+		outer_clean_range(0, trampoline_size);
 
-	/* sanity check */
-	if (ncores > num_possible_cpus()) {
-		pr_warn("socfpga: no. of cores (%d) greater than configured"
-			"maximum of %d - clipping\n", ncores, num_possible_cpus());
-		ncores = num_possible_cpus();
+		/* This will release CPU #1 out of reset. */
+		writel(0, rst_manager_base_addr + SOCFPGA_A10_RSTMGR_MODMPURST);
 	}
 
-	for (i = 0; i < ncores; i++)
-		set_cpu_possible(i, true);
+	return 0;
 }
 
 static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
 {
+	struct device_node *np;
+	void __iomem *socfpga_scu_base_addr;
+
+	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
+	if (!np) {
+		pr_err("%s: missing scu\n", __func__);
+		return;
+	}
+
+	socfpga_scu_base_addr = of_iomap(np, 0);
+	if (!socfpga_scu_base_addr)
+		return;
 	scu_enable(socfpga_scu_base_addr);
 }
 
@@ -86,17 +101,39 @@
  */
 static void socfpga_cpu_die(unsigned int cpu)
 {
-	cpu_do_idle();
+	/* Do WFI. If we wake up early, go back into WFI */
+	while (1)
+		cpu_do_idle();
+}
 
-	/* We should have never returned from idle */
-	panic("cpu %d unexpectedly exit from shutdown\n", cpu);
+/*
+ * We need a dummy function so that platform_can_cpu_hotplug() knows
+ * we support CPU hotplug. However, the function does not need to do
+ * anything, because CPUs going offline just do WFI. We could reset
+ * the CPUs but it would increase power consumption.
+ */
+static int socfpga_cpu_kill(unsigned int cpu)
+{
+	return 1;
 }
 
-struct smp_operations socfpga_smp_ops __initdata = {
-	.smp_init_cpus		= socfpga_smp_init_cpus,
+static struct smp_operations socfpga_smp_ops __initdata = {
 	.smp_prepare_cpus	= socfpga_smp_prepare_cpus,
 	.smp_boot_secondary	= socfpga_boot_secondary,
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_die		= socfpga_cpu_die,
+	.cpu_kill		= socfpga_cpu_kill,
+#endif
+};
+
+static struct smp_operations socfpga_a10_smp_ops __initdata = {
+	.smp_prepare_cpus	= socfpga_smp_prepare_cpus,
+	.smp_boot_secondary	= socfpga_a10_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+	.cpu_die		= socfpga_cpu_die,
+	.cpu_kill		= socfpga_cpu_kill,
 #endif
 };
+
+CPU_METHOD_OF_DECLARE(socfpga_smp, "altr,socfpga-smp", &socfpga_smp_ops);
+CPU_METHOD_OF_DECLARE(socfpga_a10_smp, "altr,socfpga-a10-smp", &socfpga_a10_smp_ops);