vt8500.c

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/*
 *  arch/arm/mach-vt8500/vt8500.c
 *
 *  Copyright (C) 2012 Tony Prisk <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/io.h>
#include <linux/pm.h>

#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
#include <asm/mach/map.h>

#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>

#include <mach/restart.h>

#include "common.h"

#define LEGACY_GPIO_BASE    0xD8110000
#define LEGACY_PMC_BASE     0xD8130000

/* Registers in GPIO Controller */
#define VT8500_GPIO_MUX_REG 0x200

/* Registers in Power Management Controller */
#define VT8500_HCR_REG      0x12
#define VT8500_PMSR_REG     0x60

static void __iomem *pmc_base;

void vt8500_restart(char mode, const char *cmd)
{
    if (pmc_base)
        writel(1, pmc_base + VT8500_PMSR_REG);
}

static struct map_desc vt8500_io_desc[] __initdata = {
    /* SoC MMIO registers */
    [0] = {
        .virtual    = 0xf8000000,
        .pfn        = __phys_to_pfn(0xd8000000),
        .length     = 0x00390000, /* max of all chip variants */
        .type       = MT_DEVICE
    },
};

void __init vt8500_map_io(void)
{
    iotable_init(vt8500_io_desc, ARRAY_SIZE(vt8500_io_desc));
}

static void vt8500_power_off(void)
{
    local_irq_disable();
    writew(5, pmc_base + VT8500_HCR_REG);
    asm("mcr%? p15, 0, %0, c7, c0, 4" : : "r" (0));
}

void __init vt8500_init(void)
{
    struct device_node *np;
#if defined(CONFIG_FB_VT8500) || defined(CONFIG_FB_WM8505)
    struct device_node *fb;
    void __iomem *gpio_base;
#endif

#ifdef CONFIG_FB_VT8500
    fb = of_find_compatible_node(NULL, NULL, "via,vt8500-fb");
    if (fb) {
        np = of_find_compatible_node(NULL, NULL, "via,vt8500-gpio");
        if (np) {
            gpio_base = of_iomap(np, 0);

            if (!gpio_base)
                pr_err("%s: of_iomap(gpio_mux) failed\n",
                                __func__);

            of_node_put(np);
        } else {
            gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
            if (!gpio_base)
                pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
                                __func__);
        }
        if (gpio_base) {
            writel(readl(gpio_base + VT8500_GPIO_MUX_REG) | 1,
                gpio_base + VT8500_GPIO_MUX_REG);
            iounmap(gpio_base);
        } else
            pr_err("%s: Could not remap GPIO mux\n", __func__);

        of_node_put(fb);
    }
#endif

#ifdef CONFIG_FB_WM8505
    fb = of_find_compatible_node(NULL, NULL, "wm,wm8505-fb");
    if (fb) {
        np = of_find_compatible_node(NULL, NULL, "wm,wm8505-gpio");
        if (!np)
            np = of_find_compatible_node(NULL, NULL,
                            "wm,wm8650-gpio");
        if (np) {
            gpio_base = of_iomap(np, 0);

            if (!gpio_base)
                pr_err("%s: of_iomap(gpio_mux) failed\n",
                                __func__);

            of_node_put(np);
        } else {
            gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
            if (!gpio_base)
                pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
                                __func__);
        }
        if (gpio_base) {
            writel(readl(gpio_base + VT8500_GPIO_MUX_REG) |
                0x80000000, gpio_base + VT8500_GPIO_MUX_REG);
            iounmap(gpio_base);
        } else
            pr_err("%s: Could not remap GPIO mux\n", __func__);

        of_node_put(fb);
    }
#endif

    np = of_find_compatible_node(NULL, NULL, "via,vt8500-pmc");
    if (np) {
        pmc_base = of_iomap(np, 0);

        if (!pmc_base)
            pr_err("%s:of_iomap(pmc) failed\n", __func__);

        of_node_put(np);
    } else {
        pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000);
        if (!pmc_base)
            pr_err("%s:ioremap(power_off) failed\n", __func__);
    }
    if (pmc_base)
        pm_power_off = &vt8500_power_off;
    else
        pr_err("%s: PMC Hibernation register could not be remapped, not enabling power off!\n", __func__);

    vtwm_clk_init(pmc_base);

    of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
}

static const struct of_device_id vt8500_irq_match[] __initconst = {
    { .compatible = "via,vt8500-intc", .data = vt8500_irq_init, },
    { /* sentinel */ },
};

static void __init vt8500_init_irq(void)
{
    of_irq_init(vt8500_irq_match);
};

static struct sys_timer vt8500_timer = {
    .init = vt8500_timer_init,
};

static const char * const vt8500_dt_compat[] = {
    "via,vt8500",
    "wm,wm8650",
    "wm,wm8505",
};

DT_MACHINE_START(WMT_DT, "VIA/Wondermedia SoC (Device Tree Support)")
    .dt_compat  = vt8500_dt_compat,
    .map_io     = vt8500_map_io,
    .init_irq   = vt8500_init_irq,
    .timer      = &vt8500_timer,
    .init_machine   = vt8500_init,
    .restart    = vt8500_restart,
MACHINE_END