ARM: socfpga: use of_iomap to map the SCU

Use of_iomap to map the "arm,cortex-a9-scu". By doing this, we can remove
map_io in socfpga.c.

Also, we can remove socfpga_smp_init_cpus, as arm_dt_init_cpu_maps is
already doing the CPU mapping.
Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>

arch/arm/mach-socfpga/core.h

@@ -32,7 +32,6 @@
 #define RSTMGR_MPUMODRST_CPU1		0x2     /* CPU1 Reset */
 
 extern void socfpga_secondary_startup(void);
-extern void __iomem *socfpga_scu_base_addr;
 
 extern void socfpga_init_clocks(void);
 extern void socfpga_sysmgr_init(void);

arch/arm/mach-socfpga/platsmp.c

@@ -54,32 +54,20 @@ static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
 	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 void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
 {
-	unsigned int i, ncores;
-
-	ncores = scu_get_core_count(socfpga_scu_base_addr);
-
-	for (i = 0; i < ncores; i++)
-		set_cpu_possible(i, true);
+	struct device_node *np;
+	void __iomem *socfpga_scu_base_addr;
 
-	/* 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();
+	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
+	if (!np) {
+		pr_err("%s: missing scu\n", __func__);
+		return;
 	}
 
-	for (i = 0; i < ncores; i++)
-		set_cpu_possible(i, true);
-}
-
-static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
-{
+	socfpga_scu_base_addr = of_iomap(np, 0);
+	if (!socfpga_scu_base_addr)
+		return;
 	scu_enable(socfpga_scu_base_addr);
 }
 
@@ -96,7 +84,6 @@ static void socfpga_cpu_die(unsigned int cpu)
 }
 
 struct smp_operations socfpga_smp_ops __initdata = {
-	.smp_init_cpus		= socfpga_smp_init_cpus,
 	.smp_prepare_cpus	= socfpga_smp_prepare_cpus,
 	.smp_boot_secondary	= socfpga_boot_secondary,
 #ifdef CONFIG_HOTPLUG_CPU

arch/arm/mach-socfpga/socfpga.c

@@ -27,34 +27,10 @@
 
 #include "core.h"
 
-void __iomem *socfpga_scu_base_addr = ((void __iomem *)(SOCFPGA_SCU_VIRT_BASE));
 void __iomem *sys_manager_base_addr;
 void __iomem *rst_manager_base_addr;
 unsigned long socfpga_cpu1start_addr;
 
-static struct map_desc scu_io_desc __initdata = {
-	.virtual	= SOCFPGA_SCU_VIRT_BASE,
-	.pfn		= 0, /* run-time */
-	.length		= SZ_8K,
-	.type		= MT_DEVICE,
-};
-
-static void __init socfpga_scu_map_io(void)
-{
-	unsigned long base;
-
-	/* Get SCU base */
-	asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
-
-	scu_io_desc.pfn = __phys_to_pfn(base);
-	iotable_init(&scu_io_desc, 1);
-}
-
-static void __init socfpga_map_io(void)
-{
-	socfpga_scu_map_io();
-}
-
 void __init socfpga_sysmgr_init(void)
 {
 	struct device_node *np;
@@ -103,7 +79,6 @@ DT_MACHINE_START(SOCFPGA, "Altera SOCFPGA")
 	.l2c_aux_val	= 0,
 	.l2c_aux_mask	= ~0,
 	.smp		= smp_ops(socfpga_smp_ops),
-	.map_io		= socfpga_map_io,
 	.init_irq	= socfpga_init_irq,
 	.restart	= socfpga_cyclone5_restart,
 	.dt_compat	= altera_dt_match,