highbank.c

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/*
 * Copyright 2010-2011 Calxeda, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
 */
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/smp.h>
#include <linux/amba/bus.h>

#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
#include <asm/smp_twd.h>
#include <asm/hardware/arm_timer.h>
#include <asm/hardware/timer-sp.h>
#include <asm/hardware/gic.h>
#include <asm/hardware/cache-l2x0.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/time.h>

#include "core.h"
#include "sysregs.h"

void __iomem *sregs_base;

#define HB_SCU_VIRT_BASE    0xfee00000
void __iomem *scu_base_addr = ((void __iomem *)(HB_SCU_VIRT_BASE));

static struct map_desc scu_io_desc __initdata = {
    .virtual    = HB_SCU_VIRT_BASE,
    .pfn        = 0, /* run-time */
    .length     = SZ_4K,
    .type       = MT_DEVICE,
};

static void __init highbank_scu_map_io(void)
{
    unsigned long base;

    /* Get SCU base */
    asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));

    scu_io_desc.pfn = __phys_to_pfn(base);
    iotable_init(&scu_io_desc, 1);
}

static void __init highbank_map_io(void)
{
    highbank_scu_map_io();
    highbank_lluart_map_io();
}

#define HB_JUMP_TABLE_PHYS(cpu)     (0x40 + (0x10 * (cpu)))
#define HB_JUMP_TABLE_VIRT(cpu)     phys_to_virt(HB_JUMP_TABLE_PHYS(cpu))

void highbank_set_cpu_jump(int cpu, void *jump_addr)
{
    cpu = cpu_logical_map(cpu);
    writel(virt_to_phys(jump_addr), HB_JUMP_TABLE_VIRT(cpu));
    __cpuc_flush_dcache_area(HB_JUMP_TABLE_VIRT(cpu), 16);
    outer_clean_range(HB_JUMP_TABLE_PHYS(cpu),
              HB_JUMP_TABLE_PHYS(cpu) + 15);
}

const static struct of_device_id irq_match[] = {
    { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
    {}
};

#ifdef CONFIG_CACHE_L2X0
static void highbank_l2x0_disable(void)
{
    /* Disable PL310 L2 Cache controller */
    highbank_smc1(0x102, 0x0);
}
#endif

static void __init highbank_init_irq(void)
{
    of_irq_init(irq_match);

#ifdef CONFIG_CACHE_L2X0
    /* Enable PL310 L2 Cache controller */
    highbank_smc1(0x102, 0x1);
    l2x0_of_init(0, ~0UL);
    outer_cache.disable = highbank_l2x0_disable;
#endif
}

static struct clk_lookup lookup = {
    .dev_id = "sp804",
    .con_id = NULL,
};

static void __init highbank_timer_init(void)
{
    int irq;
    struct device_node *np;
    void __iomem *timer_base;

    /* Map system registers */
    np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs");
    sregs_base = of_iomap(np, 0);
    WARN_ON(!sregs_base);

    np = of_find_compatible_node(NULL, NULL, "arm,sp804");
    timer_base = of_iomap(np, 0);
    WARN_ON(!timer_base);
    irq = irq_of_parse_and_map(np, 0);

    highbank_clocks_init();
    lookup.clk = of_clk_get(np, 0);
    clkdev_add(&lookup);

    sp804_clocksource_and_sched_clock_init(timer_base + 0x20, "timer1");
    sp804_clockevents_init(timer_base, irq, "timer0");

    twd_local_timer_of_register();
}

static struct sys_timer highbank_timer = {
    .init = highbank_timer_init,
};

static void highbank_power_off(void)
{
    hignbank_set_pwr_shutdown();
    scu_power_mode(scu_base_addr, SCU_PM_POWEROFF);

    while (1)
        cpu_do_idle();
}

static int highbank_platform_notifier(struct notifier_block *nb,
                  unsigned long event, void *__dev)
{
    struct resource *res;
    int reg = -1;
    struct device *dev = __dev;

    if (event != BUS_NOTIFY_ADD_DEVICE)
        return NOTIFY_DONE;

    if (of_device_is_compatible(dev->of_node, "calxeda,hb-ahci"))
        reg = 0xc;
    else if (of_device_is_compatible(dev->of_node, "calxeda,hb-sdhci"))
        reg = 0x18;
    else if (of_device_is_compatible(dev->of_node, "arm,pl330"))
        reg = 0x20;
    else if (of_device_is_compatible(dev->of_node, "calxeda,hb-xgmac")) {
        res = platform_get_resource(to_platform_device(dev),
                        IORESOURCE_MEM, 0);
        if (res) {
            if (res->start == 0xfff50000)
                reg = 0;
            else if (res->start == 0xfff51000)
                reg = 4;
        }
    }

    if (reg < 0)
        return NOTIFY_DONE;

    if (of_property_read_bool(dev->of_node, "dma-coherent")) {
        writel(0xff31, sregs_base + reg);
        set_dma_ops(dev, &arm_coherent_dma_ops);
    } else
        writel(0, sregs_base + reg);

    return NOTIFY_OK;
}

static struct notifier_block highbank_amba_nb = {
    .notifier_call = highbank_platform_notifier,
};

static struct notifier_block highbank_platform_nb = {
    .notifier_call = highbank_platform_notifier,
};

static void __init highbank_init(void)
{
    pm_power_off = highbank_power_off;
    highbank_pm_init();

    bus_register_notifier(&platform_bus_type, &highbank_platform_nb);
    bus_register_notifier(&amba_bustype, &highbank_amba_nb);

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

static const char *highbank_match[] __initconst = {
    "calxeda,highbank",
    NULL,
};

DT_MACHINE_START(HIGHBANK, "Highbank")
    .smp        = smp_ops(highbank_smp_ops),
    .map_io     = highbank_map_io,
    .init_irq   = highbank_init_irq,
    .timer      = &highbank_timer,
    .handle_irq = gic_handle_irq,
    .init_machine   = highbank_init,
    .dt_compat  = highbank_match,
    .restart    = highbank_restart,
MACHINE_END