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>

diff --git a/arch/arm/mach-socfpga/core.h b/arch/arm/mach-socfpga/core.h
index a0f3b1c..5913bbb 100644 (file)
--- a/arch/arm/mach-socfpga/core.h
+++ b/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);

diff --git a/arch/arm/mach-socfpga/platsmp.c b/arch/arm/mach-socfpga/platsmp.c
index c64d89b..7886eae 100644 (file)
--- a/arch/arm/mach-socfpga/platsmp.c
+++ b/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

diff --git a/arch/arm/mach-socfpga/socfpga.c b/arch/arm/mach-socfpga/socfpga.c
index 358f2c7..b63dec6 100644 (file)
--- a/arch/arm/mach-socfpga/socfpga.c
+++ b/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,