arch/arm/mach-socfpga/socfpga.c

   1 /*
   2  *  Copyright (C) 2012 Altera Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 #include <linux/dw_apb_timer.h>
  18 #include <linux/of_address.h>
  19 #include <linux/of_irq.h>
  20 #include <linux/of_platform.h>
  21
  22 #include <asm/hardware/cache-l2x0.h>
  23 #include <asm/hardware/gic.h>
  24 #include <asm/mach/arch.h>
  25 #include <asm/mach/map.h>
  26
  27 #include "core.h"
  28
  29 void __iomem *socfpga_scu_base_addr = ((void __iomem *)(SOCFPGA_SCU_VIRT_BASE));
  30 void __iomem *sys_manager_base_addr;
  31 void __iomem *rst_manager_base_addr;
  32
  33 static struct map_desc scu_io_desc __initdata = {
  34         .virtual        = SOCFPGA_SCU_VIRT_BASE,
  35         .pfn            = 0, /* run-time */
  36         .length         = SZ_8K,
  37         .type           = MT_DEVICE,
  38 };
  39
  40 static struct map_desc uart_io_desc __initdata = {
  41         .virtual        = 0xfec02000,
  42         .pfn            = __phys_to_pfn(0xffc02000),
  43         .length         = SZ_8K,
  44         .type           = MT_DEVICE,
  45 };
  46
  47 static void __init socfpga_scu_map_io(void)
  48 {
  49         unsigned long base;
  50
  51         /* Get SCU base */
  52         asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
  53
  54         scu_io_desc.pfn = __phys_to_pfn(base);
  55         iotable_init(&scu_io_desc, 1);
  56 }
  57
  58 static void __init socfpga_map_io(void)
  59 {
  60         socfpga_scu_map_io();
  61         iotable_init(&uart_io_desc, 1);
  62         early_printk("Early printk initialized\n");
  63 }
  64
  65 const static struct of_device_id irq_match[] = {
  66         { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
  67         {}
  68 };
  69
  70 void __init socfpga_sysmgr_init(void)
  71 {
  72         struct device_node *np;
  73
  74         np = of_find_compatible_node(NULL, NULL, "altr,sys-mgr");
  75         sys_manager_base_addr = of_iomap(np, 0);
  76
  77         np = of_find_compatible_node(NULL, NULL, "altr,rst-mgr");
  78         rst_manager_base_addr = of_iomap(np, 0);
  79 }
  80
  81 static void __init gic_init_irq(void)
  82 {
  83         of_irq_init(irq_match);
  84         socfpga_sysmgr_init();
  85 }
  86
  87 static void socfpga_cyclone5_restart(char mode, const char *cmd)
  88 {
  89         /* TODO: */
  90 }
  91
  92 static void __init socfpga_cyclone5_init(void)
  93 {
  94         l2x0_of_init(0, ~0UL);
  95         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
  96         socfpga_init_clocks();
  97 }
  98
  99 static const char *altera_dt_match[] = {
 100         "altr,socfpga",
 101         "altr,socfpga-cyclone5",
 102         NULL
 103 };
 104
 105 DT_MACHINE_START(SOCFPGA, "Altera SOCFPGA")
 106         .smp            = smp_ops(socfpga_smp_ops),
 107         .map_io         = socfpga_map_io,
 108         .init_irq       = gic_init_irq,
 109         .handle_irq     = gic_handle_irq,
 110         .timer          = &dw_apb_timer,
 111         .init_machine   = socfpga_cyclone5_init,
 112         .restart        = socfpga_cyclone5_restart,
 113         .dt_compat      = altera_dt_match,
 114 MACHINE_END