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/pl320-ipc.h>
  24 #include <linux/of.h>
  25 #include <linux/of_irq.h>
  26 #include <linux/of_address.h>
  27 #include <linux/reboot.h>
  28 #include <linux/amba/bus.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/psci.h>
  31
  32 #include <asm/hardware/cache-l2x0.h>
  33 #include <asm/mach/arch.h>
  34 #include <asm/mach/map.h>
  35
  36 #include "core.h"
  37 #include "sysregs.h"
  38
  39 void __iomem *sregs_base;
  40 void __iomem *scu_base_addr;
  41
  42 static void __init highbank_scu_map_io(void)
  43 {
  44         unsigned long base;
  45
  46         /* Get SCU base */
  47         asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
  48
  49         scu_base_addr = ioremap(base, SZ_4K);
  50 }
  51
  52
  53 static void highbank_l2c310_write_sec(unsigned long val, unsigned reg)
  54 {
  55         if (reg == L2X0_CTRL)
  56                 highbank_smc1(0x102, val);
  57         else
  58                 WARN_ONCE(1, "Highbank L2C310: ignoring write to reg 0x%x\n",
  59                           reg);
  60 }
  61
  62 static void __init highbank_init_irq(void)
  63 {
  64         irqchip_init();
  65
  66         if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9"))
  67                 highbank_scu_map_io();
  68 }
  69
  70 static void highbank_power_off(void)
  71 {
  72         highbank_set_pwr_shutdown();
  73
  74         while (1)
  75                 cpu_do_idle();
  76 }
  77
  78 static int highbank_platform_notifier(struct notifier_block *nb,
  79                                   unsigned long event, void *__dev)
  80 {
  81         struct resource *res;
  82         int reg = -1;
  83         u32 val;
  84         struct device *dev = __dev;
  85
  86         if (event != BUS_NOTIFY_ADD_DEVICE)
  87                 return NOTIFY_DONE;
  88
  89         if (of_device_is_compatible(dev->of_node, "calxeda,hb-ahci"))
  90                 reg = 0xc;
  91         else if (of_device_is_compatible(dev->of_node, "calxeda,hb-sdhci"))
  92                 reg = 0x18;
  93         else if (of_device_is_compatible(dev->of_node, "arm,pl330"))
  94                 reg = 0x20;
  95         else if (of_device_is_compatible(dev->of_node, "calxeda,hb-xgmac")) {
  96                 res = platform_get_resource(to_platform_device(dev),
  97                                             IORESOURCE_MEM, 0);
  98                 if (res) {
  99                         if (res->start == 0xfff50000)
 100                                 reg = 0;
 101                         else if (res->start == 0xfff51000)
 102                                 reg = 4;
 103                 }
 104         }
 105
 106         if (reg < 0)
 107                 return NOTIFY_DONE;
 108
 109         if (of_property_read_bool(dev->of_node, "dma-coherent")) {
 110                 val = readl(sregs_base + reg);
 111                 writel(val | 0xff01, sregs_base + reg);
 112                 set_dma_ops(dev, &arm_coherent_dma_ops);
 113         }
 114
 115         return NOTIFY_OK;
 116 }
 117
 118 static struct notifier_block highbank_amba_nb = {
 119         .notifier_call = highbank_platform_notifier,
 120 };
 121
 122 static struct notifier_block highbank_platform_nb = {
 123         .notifier_call = highbank_platform_notifier,
 124 };
 125
 126 static struct platform_device highbank_cpuidle_device = {
 127         .name = "cpuidle-calxeda",
 128 };
 129
 130 static int hb_keys_notifier(struct notifier_block *nb, unsigned long event, void *data)
 131 {
 132         u32 key = *(u32 *)data;
 133
 134         if (event != 0x1000)
 135                 return 0;
 136
 137         if (key == KEY_POWER)
 138                 orderly_poweroff(false);
 139         else if (key == 0xffff)
 140                 ctrl_alt_del();
 141
 142         return 0;
 143 }
 144 static struct notifier_block hb_keys_nb = {
 145         .notifier_call = hb_keys_notifier,
 146 };
 147
 148 static void __init highbank_init(void)
 149 {
 150         struct device_node *np;
 151
 152         /* Map system registers */
 153         np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs");
 154         sregs_base = of_iomap(np, 0);
 155         WARN_ON(!sregs_base);
 156
 157         pm_power_off = highbank_power_off;
 158         highbank_pm_init();
 159
 160         bus_register_notifier(&platform_bus_type, &highbank_platform_nb);
 161         bus_register_notifier(&amba_bustype, &highbank_amba_nb);
 162
 163         pl320_ipc_register_notifier(&hb_keys_nb);
 164
 165         if (psci_ops.cpu_suspend)
 166                 platform_device_register(&highbank_cpuidle_device);
 167 }
 168
 169 static const char *const highbank_match[] __initconst = {
 170         "calxeda,highbank",
 171         "calxeda,ecx-2000",
 172         NULL,
 173 };
 174
 175 DT_MACHINE_START(HIGHBANK, "Highbank")
 176 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
 177         .dma_zone_size  = (4ULL * SZ_1G),
 178 #endif
 179         .l2c_aux_val    = 0,
 180         .l2c_aux_mask   = ~0,
 181         .l2c_write_sec  = highbank_l2c310_write_sec,
 182         .init_irq       = highbank_init_irq,
 183         .init_machine   = highbank_init,
 184         .dt_compat      = highbank_match,
 185         .restart        = highbank_restart,
 186 MACHINE_END