LXR linux/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
  39void __iomem *sregs_base;
  40void __iomem *scu_base_addr;
  41
  42static 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
  53static 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
  62static 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
  70static void highbank_power_off(void)
  71{
  72        highbank_set_pwr_shutdown();
  73
  74        while (1)
  75                cpu_do_idle();
  76}
  77
  78static 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
 118static struct notifier_block highbank_amba_nb = {
 119        .notifier_call = highbank_platform_notifier,
 120};
 121
 122static struct notifier_block highbank_platform_nb = {
 123        .notifier_call = highbank_platform_notifier,
 124};
 125
 126static struct platform_device highbank_cpuidle_device = {
 127        .name = "cpuidle-calxeda",
 128};
 129
 130static 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}
 144static struct notifier_block hb_keys_nb = {
 145        .notifier_call = hb_keys_notifier,
 146};
 147
 148static 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
 169static const char *const highbank_match[] __initconst = {
 170        "calxeda,highbank",
 171        "calxeda,ecx-2000",
 172        NULL,
 173};
 174
 175DT_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,
 186MACHINE_END
 187