Pileus Git - ~andy/linux/blob - 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/hardware/gic.h>
  34 #include <asm/hardware/cache-l2x0.h>
  35
  36 #include <mach/zynq_soc.h>
  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 /* The minimum devices needed to be mapped before the VM system is up and
  72  * running include the GIC, UART and Timer Counter.
  73  */
  74
  75 static struct map_desc io_desc[] __initdata = {
  76         {
  77                 .virtual        = TTC0_VIRT,
  78                 .pfn            = __phys_to_pfn(TTC0_PHYS),
  79                 .length         = TTC0_SIZE,
  80                 .type           = MT_DEVICE,
  81         }, {
  82                 .virtual        = SCU_PERIPH_VIRT,
  83                 .pfn            = __phys_to_pfn(SCU_PERIPH_PHYS),
  84                 .length         = SCU_PERIPH_SIZE,
  85                 .type           = MT_DEVICE,
  86         },
  87
  88 #ifdef CONFIG_DEBUG_LL
  89         {
  90                 .virtual        = LL_UART_VADDR,
  91                 .pfn            = __phys_to_pfn(LL_UART_PADDR),
  92                 .length         = UART_SIZE,
  93                 .type           = MT_DEVICE,
  94         },
  95 #endif
  96
  97 };
  98
  99 static void __init xilinx_zynq_timer_init(void)
 100 {
 101         struct device_node *np;
 102         void __iomem *slcr;
 103
 104         np = of_find_compatible_node(NULL, NULL, "xlnx,zynq-slcr");
 105         slcr = of_iomap(np, 0);
 106         WARN_ON(!slcr);
 107
 108         xilinx_zynq_clocks_init(slcr);
 109
 110         xttcpss_timer_init();
 111 }
 112
 113 /*
 114  * Instantiate and initialize the system timer structure
 115  */
 116 static struct sys_timer xttcpss_sys_timer = {
 117         .init           = xilinx_zynq_timer_init,
 118 };
 119
 120 /**
 121  * xilinx_map_io() - Create memory mappings needed for early I/O.
 122  */
 123 static void __init xilinx_map_io(void)
 124 {
 125         iotable_init(io_desc, ARRAY_SIZE(io_desc));
 126 }
 127
 128 static const char *xilinx_dt_match[] = {
 129         "xlnx,zynq-zc702",
 130         "xlnx,zynq-7000",
 131         NULL
 132 };
 133
 134 MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
 135         .map_io         = xilinx_map_io,
 136         .init_irq       = xilinx_irq_init,
 137         .handle_irq     = gic_handle_irq,
 138         .init_machine   = xilinx_init_machine,
 139         .timer          = &xttcpss_sys_timer,
 140         .dt_compat      = xilinx_dt_match,
 141 MACHINE_END