arch/arm/mach-highbank/highbank.c

   1 /*
   2  * Copyright 2010-2011 Calxeda, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #include <linux/clk.h>
  17 #include <linux/clkdev.h>
  18 #include <linux/io.h>
  19 #include <linux/irq.h>
  20 #include <linux/irqdomain.h>
  21 #include <linux/of.h>
  22 #include <linux/of_irq.h>
  23 #include <linux/of_platform.h>
  24 #include <linux/of_address.h>
  25
  26 #include <asm/cacheflush.h>
  27 #include <asm/unified.h>
  28 #include <asm/smp_scu.h>
  29 #include <asm/hardware/arm_timer.h>
  30 #include <asm/hardware/timer-sp.h>
  31 #include <asm/hardware/gic.h>
  32 #include <asm/hardware/cache-l2x0.h>
  33 #include <asm/mach/arch.h>
  34 #include <asm/mach/map.h>
  35 #include <asm/mach/time.h>
  36 #include <mach/irqs.h>
  37
  38 #include "core.h"
  39 #include "sysregs.h"
  40
  41 void __iomem *sregs_base;
  42
  43 #define HB_SCU_VIRT_BASE        0xfee00000
  44 void __iomem *scu_base_addr = ((void __iomem *)(HB_SCU_VIRT_BASE));
  45
  46 static struct map_desc scu_io_desc __initdata = {
  47         .virtual        = HB_SCU_VIRT_BASE,
  48         .pfn            = 0, /* run-time */
  49         .length         = SZ_4K,
  50         .type           = MT_DEVICE,
  51 };
  52
  53 static void __init highbank_scu_map_io(void)
  54 {
  55         unsigned long base;
  56
  57         /* Get SCU base */
  58         asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
  59
  60         scu_io_desc.pfn = __phys_to_pfn(base);
  61         iotable_init(&scu_io_desc, 1);
  62 }
  63
  64 static void __init highbank_map_io(void)
  65 {
  66         highbank_scu_map_io();
  67         highbank_lluart_map_io();
  68 }
  69
  70 #define HB_JUMP_TABLE_PHYS(cpu)         (0x40 + (0x10 * (cpu)))
  71 #define HB_JUMP_TABLE_VIRT(cpu)         phys_to_virt(HB_JUMP_TABLE_PHYS(cpu))
  72
  73 void highbank_set_cpu_jump(int cpu, void *jump_addr)
  74 {
  75         writel(BSYM(virt_to_phys(jump_addr)), HB_JUMP_TABLE_VIRT(cpu));
  76         __cpuc_flush_dcache_area(HB_JUMP_TABLE_VIRT(cpu), 16);
  77         outer_clean_range(HB_JUMP_TABLE_PHYS(cpu),
  78                           HB_JUMP_TABLE_PHYS(cpu) + 15);
  79 }
  80
  81 const static struct of_device_id irq_match[] = {
  82         { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
  83         {}
  84 };
  85
  86 static void __init highbank_init_irq(void)
  87 {
  88         of_irq_init(irq_match);
  89         l2x0_of_init(0, ~0UL);
  90 }
  91
  92 static void __init highbank_timer_init(void)
  93 {
  94         int irq;
  95         struct device_node *np;
  96         void __iomem *timer_base;
  97
  98         /* Map system registers */
  99         np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs");
 100         sregs_base = of_iomap(np, 0);
 101         WARN_ON(!sregs_base);
 102
 103         np = of_find_compatible_node(NULL, NULL, "arm,sp804");
 104         timer_base = of_iomap(np, 0);
 105         WARN_ON(!timer_base);
 106         irq = irq_of_parse_and_map(np, 0);
 107
 108         highbank_clocks_init();
 109
 110         sp804_clocksource_init(timer_base + 0x20, "timer1");
 111         sp804_clockevents_init(timer_base, irq, "timer0");
 112 }
 113
 114 static struct sys_timer highbank_timer = {
 115         .init = highbank_timer_init,
 116 };
 117
 118 static void highbank_power_off(void)
 119 {
 120         hignbank_set_pwr_shutdown();
 121         scu_power_mode(scu_base_addr, SCU_PM_POWEROFF);
 122
 123         while (1)
 124                 cpu_do_idle();
 125 }
 126
 127 static void __init highbank_init(void)
 128 {
 129         pm_power_off = highbank_power_off;
 130
 131         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 132 }
 133
 134 static const char *highbank_match[] __initconst = {
 135         "calxeda,highbank",
 136         NULL,
 137 };
 138
 139 DT_MACHINE_START(HIGHBANK, "Highbank")
 140         .map_io         = highbank_map_io,
 141         .init_irq       = highbank_init_irq,
 142         .timer          = &highbank_timer,
 143         .init_machine   = highbank_init,
 144         .dt_compat      = highbank_match,
 145 MACHINE_END