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/of_address.h>
  24 #include <linux/of_irq.h>
  25 #include <linux/of_platform.h>
  26 #include <linux/of.h>
  27
  28 #include <asm/mach/arch.h>
  29 #include <asm/mach/map.h>
  30 #include <asm/mach/time.h>
  31 #include <asm/mach-types.h>
  32 #include <asm/page.h>
  33 #include <asm/pgtable.h>
  34 #include <asm/hardware/gic.h>
  35 #include <asm/hardware/cache-l2x0.h>
  36
  37 #include "common.h"
  38
  39 static struct of_device_id zynq_of_bus_ids[] __initdata = {
  40         { .compatible = "simple-bus", },
  41         {}
  42 };
  43
  44 /**
  45  * xilinx_init_machine() - System specific initialization, intended to be
  46  *                         called from board specific initialization.
  47  */
  48 static void __init xilinx_init_machine(void)
  49 {
  50         /*
  51          * 64KB way size, 8-way associativity, parity disabled
  52          */
  53         l2x0_of_init(0x02060000, 0xF0F0FFFF);
  54
  55         of_platform_bus_probe(NULL, zynq_of_bus_ids, NULL);
  56 }
  57
  58 static struct of_device_id irq_match[] __initdata = {
  59         { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
  60         { }
  61 };
  62
  63 /**
  64  * xilinx_irq_init() - Interrupt controller initialization for the GIC.
  65  */
  66 static void __init xilinx_irq_init(void)
  67 {
  68         of_irq_init(irq_match);
  69 }
  70
  71 #define SCU_PERIPH_PHYS         0xF8F00000
  72 #define SCU_PERIPH_SIZE         SZ_8K
  73 #define SCU_PERIPH_VIRT         (VMALLOC_END - SCU_PERIPH_SIZE)
  74
  75 static struct map_desc scu_desc __initdata = {
  76         .virtual        = SCU_PERIPH_VIRT,
  77         .pfn            = __phys_to_pfn(SCU_PERIPH_PHYS),
  78         .length         = SCU_PERIPH_SIZE,
  79         .type           = MT_DEVICE,
  80 };
  81
  82 static void __init xilinx_zynq_timer_init(void)
  83 {
  84         struct device_node *np;
  85         void __iomem *slcr;
  86
  87         np = of_find_compatible_node(NULL, NULL, "xlnx,zynq-slcr");
  88         slcr = of_iomap(np, 0);
  89         WARN_ON(!slcr);
  90
  91         xilinx_zynq_clocks_init(slcr);
  92
  93         xttcpss_timer_init();
  94 }
  95
  96 /*
  97  * Instantiate and initialize the system timer structure
  98  */
  99 static struct sys_timer xttcpss_sys_timer = {
 100         .init           = xilinx_zynq_timer_init,
 101 };
 102
 103 /**
 104  * xilinx_map_io() - Create memory mappings needed for early I/O.
 105  */
 106 static void __init xilinx_map_io(void)
 107 {
 108         debug_ll_io_init();
 109         iotable_init(&scu_desc, 1);
 110 }
 111
 112 static const char *xilinx_dt_match[] = {
 113         "xlnx,zynq-zc702",
 114         "xlnx,zynq-7000",
 115         NULL
 116 };
 117
 118 MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
 119         .map_io         = xilinx_map_io,
 120         .init_irq       = xilinx_irq_init,
 121         .handle_irq     = gic_handle_irq,
 122         .init_machine   = xilinx_init_machine,
 123         .timer          = &xttcpss_sys_timer,
 124         .dt_compat      = xilinx_dt_match,
 125 MACHINE_END