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/input.h>
  21 #include <linux/io.h>
  22 #include <linux/irqchip.h>
  23 #include <linux/mailbox.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/reboot.h>
  29 #include <linux/amba/bus.h>
  30 #include <linux/platform_device.h>
  31
  32 #include <asm/psci.h>
  33 #include <asm/hardware/cache-l2x0.h>
  34 #include <asm/mach/arch.h>
  35 #include <asm/mach/map.h>
  36
  37 #include "core.h"
  38 #include "sysregs.h"
  39
  40 void __iomem *sregs_base;
  41 void __iomem *scu_base_addr;
  42
  43 static void __init highbank_scu_map_io(void)
  44 {
  45         unsigned long base;
  46
  47         /* Get SCU base */
  48         asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
  49
  50         scu_base_addr = ioremap(base, SZ_4K);
  51 }
  52
  53
  54 static void highbank_l2c310_write_sec(unsigned long val, unsigned reg)
  55 {
  56         if (reg == L2X0_CTRL)
  57                 highbank_smc1(0x102, val);
  58         else
  59                 WARN_ONCE(1, "Highbank L2C310: ignoring write to reg 0x%x\n",
  60                           reg);
  61 }
  62
  63 static void __init highbank_init_irq(void)
  64 {
  65         irqchip_init();
  66
  67         if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9"))
  68                 highbank_scu_map_io();
  69 }
  70
  71 static void highbank_power_off(void)
  72 {
  73         highbank_set_pwr_shutdown();
  74
  75         while (1)
  76                 cpu_do_idle();
  77 }
  78
  79 static int highbank_platform_notifier(struct notifier_block *nb,
  80                                   unsigned long event, void *__dev)
  81 {
  82         struct resource *res;
  83         int reg = -1;
  84         u32 val;
  85         struct device *dev = __dev;
  86
  87         if (event != BUS_NOTIFY_ADD_DEVICE)
  88                 return NOTIFY_DONE;
  89
  90         if (of_device_is_compatible(dev->of_node, "calxeda,hb-ahci"))
  91                 reg = 0xc;
  92         else if (of_device_is_compatible(dev->of_node, "calxeda,hb-sdhci"))
  93                 reg = 0x18;
  94         else if (of_device_is_compatible(dev->of_node, "arm,pl330"))
  95                 reg = 0x20;
  96         else if (of_device_is_compatible(dev->of_node, "calxeda,hb-xgmac")) {
  97                 res = platform_get_resource(to_platform_device(dev),
  98                                             IORESOURCE_MEM, 0);
  99                 if (res) {
 100                         if (res->start == 0xfff50000)
 101                                 reg = 0;
 102                         else if (res->start == 0xfff51000)
 103                                 reg = 4;
 104                 }
 105         }
 106
 107         if (reg < 0)
 108                 return NOTIFY_DONE;
 109
 110         if (of_property_read_bool(dev->of_node, "dma-coherent")) {
 111                 val = readl(sregs_base + reg);
 112                 writel(val | 0xff01, sregs_base + reg);
 113                 set_dma_ops(dev, &arm_coherent_dma_ops);
 114         }
 115
 116         return NOTIFY_OK;
 117 }
 118
 119 static struct notifier_block highbank_amba_nb = {
 120         .notifier_call = highbank_platform_notifier,
 121 };
 122
 123 static struct notifier_block highbank_platform_nb = {
 124         .notifier_call = highbank_platform_notifier,
 125 };
 126
 127 static struct platform_device highbank_cpuidle_device = {
 128         .name = "cpuidle-calxeda",
 129 };
 130
 131 static int hb_keys_notifier(struct notifier_block *nb, unsigned long event, void *data)
 132 {
 133         u32 key = *(u32 *)data;
 134
 135         if (event != 0x1000)
 136                 return 0;
 137
 138         if (key == KEY_POWER)
 139                 orderly_poweroff(false);
 140         else if (key == 0xffff)
 141                 ctrl_alt_del();
 142
 143         return 0;
 144 }
 145 static struct notifier_block hb_keys_nb = {
 146         .notifier_call = hb_keys_notifier,
 147 };
 148
 149 static void __init highbank_init(void)
 150 {
 151         struct device_node *np;
 152
 153         /* Map system registers */
 154         np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs");
 155         sregs_base = of_iomap(np, 0);
 156         WARN_ON(!sregs_base);
 157
 158         pm_power_off = highbank_power_off;
 159         highbank_pm_init();
 160
 161         bus_register_notifier(&platform_bus_type, &highbank_platform_nb);
 162         bus_register_notifier(&amba_bustype, &highbank_amba_nb);
 163
 164         pl320_ipc_register_notifier(&hb_keys_nb);
 165
 166         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 167
 168         if (psci_ops.cpu_suspend)
 169                 platform_device_register(&highbank_cpuidle_device);
 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 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
 180         .dma_zone_size  = (4ULL * SZ_1G),
 181 #endif
 182         .l2c_aux_val    = 0,
 183         .l2c_aux_mask   = ~0,
 184         .l2c_write_sec  = highbank_l2c310_write_sec,
 185         .init_irq       = highbank_init_irq,
 186         .init_machine   = highbank_init,
 187         .dt_compat      = highbank_match,
 188         .restart        = highbank_restart,
 189 MACHINE_END