ARM: SoC: convert imx6q to SMP operations

Convert the imx6q platform to use struct smp_operations to provide
its SMP and CPU hotplug operations.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/mach-imx/hotplug.c

@@ -15,11 +15,6 @@
 #include <asm/cp15.h>
 #include <mach/common.h>
 
-int platform_cpu_kill(unsigned int cpu)
-{
-	return 1;
-}
-
 static inline void cpu_enter_lowpower(void)
 {
 	unsigned int v;
@@ -47,7 +42,7 @@ static inline void cpu_enter_lowpower(void)
  *
  * Called with IRQs disabled
  */
-void platform_cpu_die(unsigned int cpu)
+void imx_cpu_die(unsigned int cpu)
 {
 	cpu_enter_lowpower();
 	imx_enable_cpu(cpu, false);
@@ -56,12 +51,3 @@ void platform_cpu_die(unsigned int cpu)
 	while (1)
 		;
 }
-
-int platform_cpu_disable(unsigned int cpu)
-{
-	/*
-	 * we don't allow CPU 0 to be shutdown (it is still too special
-	 * e.g. clock tick interrupts)
-	 */
-	return cpu == 0 ? -EPERM : 0;
-}

arch/arm/mach-imx/mach-imx6q.c

@@ -226,6 +226,7 @@ static const char *imx6q_dt_compat[] __initdata = {
 };
 
 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)")
+	.smp		= smp_ops(imx_smp_ops),
 	.map_io		= imx6q_map_io,
 	.init_irq	= imx6q_init_irq,
 	.handle_irq	= imx6q_handle_irq,

arch/arm/mach-imx/platsmp.c

@@ -41,7 +41,7 @@ void __init imx_scu_map_io(void)
 	scu_base = IMX_IO_ADDRESS(base);
 }
 
-void __cpuinit platform_secondary_init(unsigned int cpu)
+static void __cpuinit imx_secondary_init(unsigned int cpu)
 {
 	/*
 	 * if any interrupts are already enabled for the primary
@@ -51,7 +51,7 @@ void __cpuinit platform_secondary_init(unsigned int cpu)
 	gic_secondary_init(0);
 }
 
-int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
+static int __cpuinit imx_boot_secondary(unsigned int cpu, struct task_struct *idle)
 {
 	imx_set_cpu_jump(cpu, v7_secondary_startup);
 	imx_enable_cpu(cpu, true);
@@ -62,7 +62,7 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
  * Initialise the CPU possible map early - this describes the CPUs
  * which may be present or become present in the system.
  */
-void __init smp_init_cpus(void)
+static void __init imx_smp_init_cpus(void)
 {
 	int i, ncores;
 
@@ -79,7 +79,17 @@ void imx_smp_prepare(void)
 	scu_enable(scu_base);
 }
 
-void __init platform_smp_prepare_cpus(unsigned int max_cpus)
+static void __init imx_smp_prepare_cpus(unsigned int max_cpus)
 {
 	imx_smp_prepare();
 }
+
+struct smp_operations  imx_smp_ops __initdata = {
+	.smp_init_cpus		= imx_smp_init_cpus,
+	.smp_prepare_cpus	= imx_smp_prepare_cpus,
+	.smp_secondary_init	= imx_secondary_init,
+	.smp_boot_secondary	= imx_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+	.cpu_die		= imx_cpu_die,
+#endif
+};

arch/arm/plat-mxc/include/mach/common.h

@@ -145,6 +145,8 @@ extern void imx53_smd_common_init(void);
 extern int imx6q_set_lpm(enum mxc_cpu_pwr_mode mode);
 extern void imx6q_clock_map_io(void);
 
+extern void imx_cpu_die(unsigned int cpu);
+
 #ifdef CONFIG_PM
 extern void imx6q_pm_init(void);
 extern void imx51_pm_init(void);
@@ -161,4 +163,6 @@ extern int mx51_neon_fixup(void);
 static inline int mx51_neon_fixup(void) { return 0; }
 #endif
 
+extern struct smp_operations imx_smp_ops;
+
 #endif