arch/arm/mach-zynq/common.c

   1 /*
   2  * This file contains common code that is intended to be used across
   3  * boards so that it's not replicated.
   4  *
   5  *  Copyright (C) 2011 Xilinx
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/kernel.h>
  19 #include <linux/cpumask.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/clk.h>
  22 #include <linux/clk-provider.h>
  23 #include <linux/clk/zynq.h>
  24 #include <linux/clocksource.h>
  25 #include <linux/of_address.h>
  26 #include <linux/of_irq.h>
  27 #include <linux/of_platform.h>
  28 #include <linux/of.h>
  29 #include <linux/memblock.h>
  30 #include <linux/irqchip.h>
  31 #include <linux/irqchip/arm-gic.h>
  32
  33 #include <asm/mach/arch.h>
  34 #include <asm/mach/map.h>
  35 #include <asm/mach/time.h>
  36 #include <asm/mach-types.h>
  37 #include <asm/page.h>
  38 #include <asm/pgtable.h>
  39 #include <asm/smp_scu.h>
  40 #include <asm/hardware/cache-l2x0.h>
  41
  42 #include "common.h"
  43
  44 void __iomem *zynq_scu_base;
  45
  46 /**
  47  * zynq_memory_init - Initialize special memory
  48  *
  49  * We need to stop things allocating the low memory as DMA can't work in
  50  * the 1st 512K of memory.
  51  */
  52 static void __init zynq_memory_init(void)
  53 {
  54         if (!__pa(PAGE_OFFSET))
  55                 memblock_reserve(__pa(PAGE_OFFSET), __pa(swapper_pg_dir));
  56 }
  57
  58 static struct platform_device zynq_cpuidle_device = {
  59         .name = "cpuidle-zynq",
  60 };
  61
  62 /**
  63  * zynq_init_machine - System specific initialization, intended to be
  64  *                     called from board specific initialization.
  65  */
  66 static void __init zynq_init_machine(void)
  67 {
  68         struct platform_device_info devinfo = { .name = "cpufreq-cpu0", };
  69
  70         /*
  71          * 64KB way size, 8-way associativity, parity disabled
  72          */
  73         l2x0_of_init(0x02060000, 0xF0F0FFFF);
  74
  75         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
  76
  77         platform_device_register(&zynq_cpuidle_device);
  78         platform_device_register_full(&devinfo);
  79
  80         zynq_slcr_init();
  81 }
  82
  83 static void __init zynq_timer_init(void)
  84 {
  85         zynq_early_slcr_init();
  86
  87         zynq_clock_init();
  88         of_clk_init(NULL);
  89         clocksource_of_init();
  90 }
  91
  92 static struct map_desc zynq_cortex_a9_scu_map __initdata = {
  93         .length = SZ_256,
  94         .type   = MT_DEVICE,
  95 };
  96
  97 static void __init zynq_scu_map_io(void)
  98 {
  99         unsigned long base;
 100
 101         base = scu_a9_get_base();
 102         zynq_cortex_a9_scu_map.pfn = __phys_to_pfn(base);
 103         /* Expected address is in vmalloc area that's why simple assign here */
 104         zynq_cortex_a9_scu_map.virtual = base;
 105         iotable_init(&zynq_cortex_a9_scu_map, 1);
 106         zynq_scu_base = (void __iomem *)base;
 107         BUG_ON(!zynq_scu_base);
 108 }
 109
 110 /**
 111  * zynq_map_io - Create memory mappings needed for early I/O.
 112  */
 113 static void __init zynq_map_io(void)
 114 {
 115         debug_ll_io_init();
 116         zynq_scu_map_io();
 117 }
 118
 119 static void __init zynq_irq_init(void)
 120 {
 121         gic_arch_extn.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
 122         irqchip_init();
 123 }
 124
 125 static void zynq_system_reset(enum reboot_mode mode, const char *cmd)
 126 {
 127         zynq_slcr_system_reset();
 128 }
 129
 130 static const char * const zynq_dt_match[] = {
 131         "xlnx,zynq-7000",
 132         NULL
 133 };
 134
 135 DT_MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
 136         .smp            = smp_ops(zynq_smp_ops),
 137         .map_io         = zynq_map_io,
 138         .init_irq       = zynq_irq_init,
 139         .init_machine   = zynq_init_machine,
 140         .init_time      = zynq_timer_init,
 141         .dt_compat      = zynq_dt_match,
 142         .reserve        = zynq_memory_init,
 143         .restart        = zynq_system_reset,
 144 MACHINE_END