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