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/of_irq.h>
  23 #include <linux/of_platform.h>
  24 #include <linux/of.h>
  25
  26 #include <asm/mach/arch.h>
  27 #include <asm/mach/map.h>
  28 #include <asm/mach/time.h>
  29 #include <asm/mach-types.h>
  30 #include <asm/page.h>
  31 #include <asm/hardware/gic.h>
  32 #include <asm/hardware/cache-l2x0.h>
  33
  34 #include <mach/zynq_soc.h>
  35 #include "common.h"
  36
  37 static struct of_device_id zynq_of_bus_ids[] __initdata = {
  38         { .compatible = "simple-bus", },
  39         {}
  40 };
  41
  42 /**
  43  * xilinx_init_machine() - System specific initialization, intended to be
  44  *                         called from board specific initialization.
  45  */
  46 static void __init xilinx_init_machine(void)
  47 {
  48         /*
  49          * 64KB way size, 8-way associativity, parity disabled
  50          */
  51         l2x0_of_init(0x02060000, 0xF0F0FFFF);
  52
  53         of_platform_bus_probe(NULL, zynq_of_bus_ids, NULL);
  54 }
  55
  56 static struct of_device_id irq_match[] __initdata = {
  57         { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
  58         { }
  59 };
  60
  61 /**
  62  * xilinx_irq_init() - Interrupt controller initialization for the GIC.
  63  */
  64 static void __init xilinx_irq_init(void)
  65 {
  66         of_irq_init(irq_match);
  67 }
  68
  69 /* The minimum devices needed to be mapped before the VM system is up and
  70  * running include the GIC, UART and Timer Counter.
  71  */
  72
  73 static struct map_desc io_desc[] __initdata = {
  74         {
  75                 .virtual        = TTC0_VIRT,
  76                 .pfn            = __phys_to_pfn(TTC0_PHYS),
  77                 .length         = TTC0_SIZE,
  78                 .type           = MT_DEVICE,
  79         }, {
  80                 .virtual        = SCU_PERIPH_VIRT,
  81                 .pfn            = __phys_to_pfn(SCU_PERIPH_PHYS),
  82                 .length         = SCU_PERIPH_SIZE,
  83                 .type           = MT_DEVICE,
  84         },
  85
  86 #ifdef CONFIG_DEBUG_LL
  87         {
  88                 .virtual        = LL_UART_VADDR,
  89                 .pfn            = __phys_to_pfn(LL_UART_PADDR),
  90                 .length         = UART_SIZE,
  91                 .type           = MT_DEVICE,
  92         },
  93 #endif
  94
  95 };
  96
  97 static void __init xilinx_zynq_timer_init(void)
  98 {
  99         xttcpss_timer_init();
 100 }
 101
 102 /*
 103  * Instantiate and initialize the system timer structure
 104  */
 105 static struct sys_timer xttcpss_sys_timer = {
 106         .init           = xilinx_zynq_timer_init,
 107 };
 108
 109 /**
 110  * xilinx_map_io() - Create memory mappings needed for early I/O.
 111  */
 112 static void __init xilinx_map_io(void)
 113 {
 114         iotable_init(io_desc, ARRAY_SIZE(io_desc));
 115 }
 116
 117 static const char *xilinx_dt_match[] = {
 118         "xlnx,zynq-zc702",
 119         "xlnx,zynq-7000",
 120         NULL
 121 };
 122
 123 MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
 124         .map_io         = xilinx_map_io,
 125         .init_irq       = xilinx_irq_init,
 126         .handle_irq     = gic_handle_irq,
 127         .init_machine   = xilinx_init_machine,
 128         .timer          = &xttcpss_sys_timer,
 129         .dt_compat      = xilinx_dt_match,
 130 MACHINE_END