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/zynq.h>
  23 #include <linux/clocksource.h>
  24 #include <linux/of_address.h>
  25 #include <linux/of_irq.h>
  26 #include <linux/of_platform.h>
  27 #include <linux/of.h>
  28 #include <linux/memblock.h>
  29 #include <linux/irqchip.h>
  30 #include <linux/irqchip/arm-gic.h>
  31
  32 #include <asm/mach/arch.h>
  33 #include <asm/mach/map.h>
  34 #include <asm/mach/time.h>
  35 #include <asm/mach-types.h>
  36 #include <asm/page.h>
  37 #include <asm/pgtable.h>
  38 #include <asm/smp_scu.h>
  39 #include <asm/hardware/cache-l2x0.h>
  40
  41 #include "common.h"
  42
  43 void __iomem *zynq_scu_base;
  44
  45 /**
  46  * zynq_memory_init - Initialize special memory
  47  *
  48  * We need to stop things allocating the low memory as DMA can't work in
  49  * the 1st 512K of memory.
  50  */
  51 static void __init zynq_memory_init(void)
  52 {
  53         if (!__pa(PAGE_OFFSET))
  54                 memblock_reserve(__pa(PAGE_OFFSET), __pa(swapper_pg_dir));
  55 }
  56
  57 static struct platform_device zynq_cpuidle_device = {
  58         .name = "cpuidle-zynq",
  59 };
  60
  61 /**
  62  * zynq_init_machine - System specific initialization, intended to be
  63  *                     called from board specific initialization.
  64  */
  65 static void __init zynq_init_machine(void)
  66 {
  67         /*
  68          * 64KB way size, 8-way associativity, parity disabled
  69          */
  70         l2x0_of_init(0x02060000, 0xF0F0FFFF);
  71
  72         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
  73
  74         platform_device_register(&zynq_cpuidle_device);
  75 }
  76
  77 static void __init zynq_timer_init(void)
  78 {
  79         zynq_slcr_init();
  80         clocksource_of_init();
  81 }
  82
  83 static struct map_desc zynq_cortex_a9_scu_map __initdata = {
  84         .length = SZ_256,
  85         .type   = MT_DEVICE,
  86 };
  87
  88 static void __init zynq_scu_map_io(void)
  89 {
  90         unsigned long base;
  91
  92         base = scu_a9_get_base();
  93         zynq_cortex_a9_scu_map.pfn = __phys_to_pfn(base);
  94         /* Expected address is in vmalloc area that's why simple assign here */
  95         zynq_cortex_a9_scu_map.virtual = base;
  96         iotable_init(&zynq_cortex_a9_scu_map, 1);
  97         zynq_scu_base = (void __iomem *)base;
  98         BUG_ON(!zynq_scu_base);
  99 }
 100
 101 /**
 102  * zynq_map_io - Create memory mappings needed for early I/O.
 103  */
 104 static void __init zynq_map_io(void)
 105 {
 106         debug_ll_io_init();
 107         zynq_scu_map_io();
 108 }
 109
 110 static void __init zynq_irq_init(void)
 111 {
 112         gic_arch_extn.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
 113         irqchip_init();
 114 }
 115
 116 static void zynq_system_reset(enum reboot_mode mode, const char *cmd)
 117 {
 118         zynq_slcr_system_reset();
 119 }
 120
 121 static const char * const zynq_dt_match[] = {
 122         "xlnx,zynq-7000",
 123         NULL
 124 };
 125
 126 DT_MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
 127         .smp            = smp_ops(zynq_smp_ops),
 128         .map_io         = zynq_map_io,
 129         .init_irq       = zynq_irq_init,
 130         .init_machine   = zynq_init_machine,
 131         .init_time      = zynq_timer_init,
 132         .dt_compat      = zynq_dt_match,
 133         .reserve        = zynq_memory_init,
 134         .restart        = zynq_system_reset,
 135 MACHINE_END