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/clocksource.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/io.h>
  21 #include <linux/irq.h>
  22 #include <linux/irqchip.h>
  23 #include <linux/irqdomain.h>
  24 #include <linux/of.h>
  25 #include <linux/of_irq.h>
  26 #include <linux/of_platform.h>
  27 #include <linux/of_address.h>
  28 #include <linux/smp.h>
  29 #include <linux/amba/bus.h>
  30 #include <linux/clk-provider.h>
  31
  32 #include <asm/cacheflush.h>
  33 #include <asm/cputype.h>
  34 #include <asm/smp_plat.h>
  35 #include <asm/hardware/cache-l2x0.h>
  36 #include <asm/mach/arch.h>
  37 #include <asm/mach/map.h>
  38 #include <asm/mach/time.h>
  39
  40 #include "core.h"
  41 #include "sysregs.h"
  42
  43 void __iomem *sregs_base;
  44 void __iomem *scu_base_addr;
  45
  46 static void __init highbank_scu_map_io(void)
  47 {
  48         unsigned long base;
  49
  50         /* Get SCU base */
  51         asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
  52
  53         scu_base_addr = ioremap(base, SZ_4K);
  54 }
  55
  56 #define HB_JUMP_TABLE_PHYS(cpu)         (0x40 + (0x10 * (cpu)))
  57 #define HB_JUMP_TABLE_VIRT(cpu)         phys_to_virt(HB_JUMP_TABLE_PHYS(cpu))
  58
  59 void highbank_set_cpu_jump(int cpu, void *jump_addr)
  60 {
  61         cpu = MPIDR_AFFINITY_LEVEL(cpu_logical_map(cpu), 0);
  62         writel(virt_to_phys(jump_addr), HB_JUMP_TABLE_VIRT(cpu));
  63         __cpuc_flush_dcache_area(HB_JUMP_TABLE_VIRT(cpu), 16);
  64         outer_clean_range(HB_JUMP_TABLE_PHYS(cpu),
  65                           HB_JUMP_TABLE_PHYS(cpu) + 15);
  66 }
  67
  68 #ifdef CONFIG_CACHE_L2X0
  69 static void highbank_l2x0_disable(void)
  70 {
  71         /* Disable PL310 L2 Cache controller */
  72         highbank_smc1(0x102, 0x0);
  73 }
  74 #endif
  75
  76 static void __init highbank_init_irq(void)
  77 {
  78         irqchip_init();
  79
  80         if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9"))
  81                 highbank_scu_map_io();
  82
  83 #ifdef CONFIG_CACHE_L2X0
  84         /* Enable PL310 L2 Cache controller */
  85         highbank_smc1(0x102, 0x1);
  86         l2x0_of_init(0, ~0UL);
  87         outer_cache.disable = highbank_l2x0_disable;
  88 #endif
  89 }
  90
  91 static void __init highbank_timer_init(void)
  92 {
  93         struct device_node *np;
  94
  95         /* Map system registers */
  96         np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs");
  97         sregs_base = of_iomap(np, 0);
  98         WARN_ON(!sregs_base);
  99
 100         of_clk_init(NULL);
 101
 102         clocksource_of_init();
 103 }
 104
 105 static void highbank_power_off(void)
 106 {
 107         highbank_set_pwr_shutdown();
 108
 109         while (1)
 110                 cpu_do_idle();
 111 }
 112
 113 static int highbank_platform_notifier(struct notifier_block *nb,
 114                                   unsigned long event, void *__dev)
 115 {
 116         struct resource *res;
 117         int reg = -1;
 118         u32 val;
 119         struct device *dev = __dev;
 120
 121         if (event != BUS_NOTIFY_ADD_DEVICE)
 122                 return NOTIFY_DONE;
 123
 124         if (of_device_is_compatible(dev->of_node, "calxeda,hb-ahci"))
 125                 reg = 0xc;
 126         else if (of_device_is_compatible(dev->of_node, "calxeda,hb-sdhci"))
 127                 reg = 0x18;
 128         else if (of_device_is_compatible(dev->of_node, "arm,pl330"))
 129                 reg = 0x20;
 130         else if (of_device_is_compatible(dev->of_node, "calxeda,hb-xgmac")) {
 131                 res = platform_get_resource(to_platform_device(dev),
 132                                             IORESOURCE_MEM, 0);
 133                 if (res) {
 134                         if (res->start == 0xfff50000)
 135                                 reg = 0;
 136                         else if (res->start == 0xfff51000)
 137                                 reg = 4;
 138                 }
 139         }
 140
 141         if (reg < 0)
 142                 return NOTIFY_DONE;
 143
 144         if (of_property_read_bool(dev->of_node, "dma-coherent")) {
 145                 val = readl(sregs_base + reg);
 146                 writel(val | 0xff01, sregs_base + reg);
 147                 set_dma_ops(dev, &arm_coherent_dma_ops);
 148         }
 149
 150         return NOTIFY_OK;
 151 }
 152
 153 static struct notifier_block highbank_amba_nb = {
 154         .notifier_call = highbank_platform_notifier,
 155 };
 156
 157 static struct notifier_block highbank_platform_nb = {
 158         .notifier_call = highbank_platform_notifier,
 159 };
 160
 161 static void __init highbank_init(void)
 162 {
 163         pm_power_off = highbank_power_off;
 164         highbank_pm_init();
 165
 166         bus_register_notifier(&platform_bus_type, &highbank_platform_nb);
 167         bus_register_notifier(&amba_bustype, &highbank_amba_nb);
 168
 169         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 170 }
 171
 172 static const char *highbank_match[] __initconst = {
 173         "calxeda,highbank",
 174         "calxeda,ecx-2000",
 175         NULL,
 176 };
 177
 178 DT_MACHINE_START(HIGHBANK, "Highbank")
 179         .smp            = smp_ops(highbank_smp_ops),
 180         .init_irq       = highbank_init_irq,
 181         .init_time      = highbank_timer_init,
 182         .init_machine   = highbank_init,
 183         .dt_compat      = highbank_match,
 184         .restart        = highbank_restart,
 185 MACHINE_END