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/irqchip.h>
  29 #include <linux/irqchip/arm-gic.h>
  30
  31 #include <asm/mach/arch.h>
  32 #include <asm/mach/map.h>
  33 #include <asm/mach/time.h>
  34 #include <asm/mach-types.h>
  35 #include <asm/page.h>
  36 #include <asm/pgtable.h>
  37 #include <asm/smp_scu.h>
  38 #include <asm/hardware/cache-l2x0.h>
  39
  40 #include "common.h"
  41
  42 void __iomem *zynq_scu_base;
  43
  44 static struct platform_device zynq_cpuidle_device = {
  45         .name = "cpuidle-zynq",
  46 };
  47
  48 /**
  49  * zynq_init_machine - System specific initialization, intended to be
  50  *                     called from board specific initialization.
  51  */
  52 static void __init zynq_init_machine(void)
  53 {
  54         /*
  55          * 64KB way size, 8-way associativity, parity disabled
  56          */
  57         l2x0_of_init(0x02060000, 0xF0F0FFFF);
  58
  59         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
  60
  61         platform_device_register(&zynq_cpuidle_device);
  62 }
  63
  64 static void __init zynq_timer_init(void)
  65 {
  66         zynq_slcr_init();
  67         clocksource_of_init();
  68 }
  69
  70 static struct map_desc zynq_cortex_a9_scu_map __initdata = {
  71         .length = SZ_256,
  72         .type   = MT_DEVICE,
  73 };
  74
  75 static void __init zynq_scu_map_io(void)
  76 {
  77         unsigned long base;
  78
  79         base = scu_a9_get_base();
  80         zynq_cortex_a9_scu_map.pfn = __phys_to_pfn(base);
  81         /* Expected address is in vmalloc area that's why simple assign here */
  82         zynq_cortex_a9_scu_map.virtual = base;
  83         iotable_init(&zynq_cortex_a9_scu_map, 1);
  84         zynq_scu_base = (void __iomem *)base;
  85         BUG_ON(!zynq_scu_base);
  86 }
  87
  88 /**
  89  * zynq_map_io - Create memory mappings needed for early I/O.
  90  */
  91 static void __init zynq_map_io(void)
  92 {
  93         debug_ll_io_init();
  94         zynq_scu_map_io();
  95 }
  96
  97 static void __init zynq_irq_init(void)
  98 {
  99         gic_arch_extn.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
 100         irqchip_init();
 101 }
 102
 103 static void zynq_system_reset(enum reboot_mode mode, const char *cmd)
 104 {
 105         zynq_slcr_system_reset();
 106 }
 107
 108 static const char * const zynq_dt_match[] = {
 109         "xlnx,zynq-7000",
 110         NULL
 111 };
 112
 113 DT_MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
 114         .smp            = smp_ops(zynq_smp_ops),
 115         .map_io         = zynq_map_io,
 116         .init_irq       = zynq_irq_init,
 117         .init_machine   = zynq_init_machine,
 118         .init_time      = zynq_timer_init,
 119         .dt_compat      = zynq_dt_match,
 120         .restart        = zynq_system_reset,
 121 MACHINE_END