/*
 * The generic setup file for PMC-Sierra MSP processors
 *
 * Copyright 2005-2007 PMC-Sierra, Inc,
 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
 *
 * 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.
 */

#include <linux/delay.h>

#include <asm/bootinfo.h>
#include <asm/cacheflush.h>
#include <asm/idle.h>
#include <asm/r4kcache.h>
#include <asm/reboot.h>
#include <asm/smp-ops.h>
#include <asm/time.h>

#include <msp_prom.h>
#include <msp_regs.h>

#if defined(CONFIG_PMC_MSP7120_GW)
#include <msp_regops.h>
#define MSP_BOARD_RESET_GPIO    9
#endif

extern void msp_serial_setup(void);

#if defined(CONFIG_PMC_MSP7120_EVAL) || \
    defined(CONFIG_PMC_MSP7120_GW) || \
    defined(CONFIG_PMC_MSP7120_FPGA)
/*
 * Performs the reset for MSP7120-based boards
 */
void msp7120_reset(void)
{
        void *start, *end, *iptr;

        /* Diasble all interrupts */
        local_irq_disable();
#ifdef CONFIG_SYS_SUPPORTS_MULTITHREADING
        dvpe();
#endif

        /* Cache the reset code of this function */
        __asm__ __volatile__ (
                "       .set    push                            \n"
                "       .set    arch=r4000                      \n"
                "       la      %0,startpoint                   \n"
                "       la      %1,endpoint                     \n"
                "       .set    pop                             \n"
                : "=r" (start), "=r" (end)
                :
        );

        for (iptr = (void *)((unsigned int)start & ~(L1_CACHE_BYTES - 1));
             iptr < end; iptr += L1_CACHE_BYTES)
                cache_op(Fill, iptr);

        __asm__ __volatile__ (
                "startpoint:                                    \n"
        );

        /* Put the DDRC into self-refresh mode */
        DDRC_INDIRECT_WRITE(DDRC_CTL(10), 0xb, 1 << 16);

        /*
         * IMPORTANT!
         * DO NOT do anything from here on out that might even
         * think about fetching from RAM - i.e., don't call any
         * non-inlined functions, and be VERY sure that any inline
         * functions you do call do NOT access any sort of RAM
         * anywhere!
         */

        /* Wait a bit for the DDRC to settle */
        mdelay(125);

#if defined(CONFIG_PMC_MSP7120_GW)
        /*
         * Set GPIO 9 HI, (tied to board reset logic)
         * GPIO 9 is the 4th GPIO of register 3
         *
         * NOTE: We cannot use the higher-level msp_gpio_mode()/out()
         * as GPIO char driver may not be enabled and it would look up
         * data inRAM!
         */
        set_value_reg32(GPIO_CFG3_REG, 0xf000, 0x8000);
        set_reg32(GPIO_DATA3_REG, 8);

        /*
         * In case GPIO9 doesn't reset the board (jumper configurable!)
         * fallback to device reset below.
         */
#endif
        /* Set bit 1 of the MSP7120 reset register */
        *RST_SET_REG = 0x00000001;

        __asm__ __volatile__ (
                "endpoint:                                      \n"
        );
}
#endif

void msp_restart(char *command)
{
        printk(KERN_WARNING "Now rebooting .......\n");

#if defined(CONFIG_PMC_MSP7120_EVAL) || \
    defined(CONFIG_PMC_MSP7120_GW) || \
    defined(CONFIG_PMC_MSP7120_FPGA)
        msp7120_reset();
#else
        /* No chip-specific reset code, just jump to the ROM reset vector */
        set_c0_status(ST0_BEV | ST0_ERL);
        change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
        flush_cache_all();
        write_c0_wired(0);

        __asm__ __volatile__("jr\t%0"::"r"(0xbfc00000));
#endif
}

void msp_halt(void)
{
        printk(KERN_WARNING "\n** You can safely turn off the power\n");
        while (1)
                /* If possible call official function to get CPU WARs */
                if (cpu_wait)
                        (*cpu_wait)();
                else
                        __asm__(".set\tmips3\n\t" "wait\n\t" ".set\tmips0");
}

void msp_power_off(void)
{
        msp_halt();
}

void __init plat_mem_setup(void)
{
        _machine_restart = msp_restart;
        _machine_halt = msp_halt;
        pm_power_off = msp_power_off;
}

void __init prom_init(void)
{
        unsigned long family;
        unsigned long revision;

        prom_argc = fw_arg0;
        prom_argv = (char **)fw_arg1;
        prom_envp = (char **)fw_arg2;

        /*
         * Someday we can use this with PMON2000 to get a
         * platform call prom routines for output etc. without
         * having to use grody hacks.  For now it's unused.
         *
         * struct callvectors *cv = (struct callvectors *) fw_arg3;
         */
        family = identify_family();
        revision = identify_revision();

        switch (family) {
        case FAMILY_FPGA:
                if (FPGA_IS_MSP4200(revision)) {
                        /* Old-style revision ID */
                        mips_machtype = MACH_MSP4200_FPGA;
                } else {
                        mips_machtype = MACH_MSP_OTHER;
                }
                break;

        case FAMILY_MSP4200:
#if defined(CONFIG_PMC_MSP4200_EVAL)
                mips_machtype  = MACH_MSP4200_EVAL;
#elif defined(CONFIG_PMC_MSP4200_GW)
                mips_machtype  = MACH_MSP4200_GW;
#else
                mips_machtype = MACH_MSP_OTHER;
#endif
                break;

        case FAMILY_MSP4200_FPGA:
                mips_machtype  = MACH_MSP4200_FPGA;
                break;

        case FAMILY_MSP7100:
#if defined(CONFIG_PMC_MSP7120_EVAL)
                mips_machtype = MACH_MSP7120_EVAL;
#elif defined(CONFIG_PMC_MSP7120_GW)
                mips_machtype = MACH_MSP7120_GW;
#else
                mips_machtype = MACH_MSP_OTHER;
#endif
                break;

        case FAMILY_MSP7100_FPGA:
                mips_machtype  = MACH_MSP7120_FPGA;
                break;

        default:
                /* we don't recognize the machine */
                mips_machtype  = MACH_UNKNOWN;
                panic("***Bogosity factor five***, exiting");
                break;
        }

        prom_init_cmdline();

        prom_meminit();

        /*
         * Sub-system setup follows.
         * Setup functions can  either be called here or using the
         * subsys_initcall mechanism (i.e. see msp_pci_setup). The
         * order in which they are called can be changed by using the
         * link order in arch/mips/pmc-sierra/msp71xx/Makefile.
         *
         * NOTE: Please keep sub-system specific initialization code
         * in separate specific files.
         */
        msp_serial_setup();

        register_vsmp_smp_ops();
}