/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/memblock.h>
#include <linux/ioport.h>
#include <linux/pm.h>
#include <asm/bmips.h>
#include <asm/bootinfo.h>
#include <asm/time.h>
#include <asm/reboot.h>
#include <asm/cacheflush.h>
#include <bcm63xx_board.h>
#include <bcm63xx_cpu.h>
#include <bcm63xx_regs.h>
#include <bcm63xx_io.h>
#include <bcm63xx_gpio.h>

/*
 * CBR addr doesn't change and we can cache it.
 * For broken SoC/Bootloader CBR addr might also be provided via DT
 * with "brcm,bmips-cbr-reg" in the "cpus" node.
 */
void __iomem *bmips_cbr_addr __read_mostly;

void bcm63xx_machine_halt(void)
{
        pr_info("System halted\n");
        while (1)
                ;
}

static void bcm6348_a1_reboot(void)
{
        u32 reg;

        /* soft reset all blocks */
        pr_info("soft-resetting all blocks ...\n");
        reg = bcm_perf_readl(PERF_SOFTRESET_REG);
        reg &= ~SOFTRESET_6348_ALL;
        bcm_perf_writel(reg, PERF_SOFTRESET_REG);
        mdelay(10);

        reg = bcm_perf_readl(PERF_SOFTRESET_REG);
        reg |= SOFTRESET_6348_ALL;
        bcm_perf_writel(reg, PERF_SOFTRESET_REG);
        mdelay(10);

        /* Jump to the power on address. */
        pr_info("jumping to reset vector.\n");
        /* set high vectors (base at 0xbfc00000 */
        set_c0_status(ST0_BEV | ST0_ERL);
        /* run uncached in kseg0 */
        change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
        __flush_cache_all();
        /* remove all wired TLB entries */
        write_c0_wired(0);
        __asm__ __volatile__(
                "jr\t%0"
                :
                : "r" (0xbfc00000));
        while (1)
                ;
}

void bcm63xx_machine_reboot(void)
{
        u32 reg, perf_regs[2] = { 0, 0 };
        unsigned int i;

        /* mask and clear all external irq */
        switch (bcm63xx_get_cpu_id()) {
        case BCM3368_CPU_ID:
                perf_regs[0] = PERF_EXTIRQ_CFG_REG_3368;
                break;
        case BCM6328_CPU_ID:
                perf_regs[0] = PERF_EXTIRQ_CFG_REG_6328;
                break;
        case BCM6338_CPU_ID:
                perf_regs[0] = PERF_EXTIRQ_CFG_REG_6338;
                break;
        case BCM6345_CPU_ID:
                perf_regs[0] = PERF_EXTIRQ_CFG_REG_6345;
                break;
        case BCM6348_CPU_ID:
                perf_regs[0] = PERF_EXTIRQ_CFG_REG_6348;
                break;
        case BCM6358_CPU_ID:
                perf_regs[0] = PERF_EXTIRQ_CFG_REG_6358;
                break;
        case BCM6362_CPU_ID:
                perf_regs[0] = PERF_EXTIRQ_CFG_REG_6362;
                break;
        }

        for (i = 0; i < 2; i++) {
                if (!perf_regs[i])
                        break;

                reg = bcm_perf_readl(perf_regs[i]);
                if (BCMCPU_IS_6348()) {
                        reg &= ~EXTIRQ_CFG_MASK_ALL_6348;
                        reg |= EXTIRQ_CFG_CLEAR_ALL_6348;
                } else {
                        reg &= ~EXTIRQ_CFG_MASK_ALL;
                        reg |= EXTIRQ_CFG_CLEAR_ALL;
                }
                bcm_perf_writel(reg, perf_regs[i]);
        }

        if (BCMCPU_IS_6348() && (bcm63xx_get_cpu_rev() == 0xa1))
                bcm6348_a1_reboot();

        pr_info("triggering watchdog soft-reset...\n");
        if (BCMCPU_IS_6328()) {
                bcm_wdt_writel(1, WDT_SOFTRESET_REG);
        } else {
                reg = bcm_perf_readl(PERF_SYS_PLL_CTL_REG);
                reg |= SYS_PLL_SOFT_RESET;
                bcm_perf_writel(reg, PERF_SYS_PLL_CTL_REG);
        }
        while (1)
                ;
}

static void __bcm63xx_machine_reboot(char *p)
{
        bcm63xx_machine_reboot();
}

/*
 * return system type in /proc/cpuinfo
 */
const char *get_system_type(void)
{
        static char buf[128];
        snprintf(buf, sizeof(buf), "bcm63xx/%s (0x%04x/0x%02X)",
                 board_get_name(),
                 bcm63xx_get_cpu_id(), bcm63xx_get_cpu_rev());
        return buf;
}

void __init plat_time_init(void)
{
        mips_hpt_frequency = bcm63xx_get_cpu_freq() / 2;
}

void __init plat_mem_setup(void)
{
        memblock_add(0, bcm63xx_get_memory_size());

        _machine_halt = bcm63xx_machine_halt;
        _machine_restart = __bcm63xx_machine_reboot;
        pm_power_off = bcm63xx_machine_halt;

        set_io_port_base(0);
        ioport_resource.start = 0;
        ioport_resource.end = ~0;

        board_setup();
}

static int __init bcm63xx_register_devices(void)
{
        /* register gpiochip */
        bcm63xx_gpio_init();

        return board_register_devices();
}

arch_initcall(bcm63xx_register_devices);