/*
 * Common boot and setup code for both 32-bit and 64-bit.
 * Extracted from arch/powerpc/kernel/setup_64.c.
 *
 * Copyright (C) 2001 PPC64 Team, IBM Corp
 *
 *      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.
 */

#undef DEBUG

#include <linux/module.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/ioport.h>
#include <linux/console.h>
#include <linux/screen_info.h>
#include <linux/root_dev.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/unistd.h>
#include <linux/serial.h>
#include <linux/serial_8250.h>
#include <linux/debugfs.h>
#include <linux/percpu.h>
#include <linux/lmb.h>
#include <linux/of_platform.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/processor.h>
#include <asm/vdso_datapage.h>
#include <asm/pgtable.h>
#include <asm/smp.h>
#include <asm/elf.h>
#include <asm/machdep.h>
#include <asm/time.h>
#include <asm/cputable.h>
#include <asm/sections.h>
#include <asm/firmware.h>
#include <asm/btext.h>
#include <asm/nvram.h>
#include <asm/setup.h>
#include <asm/system.h>
#include <asm/rtas.h>
#include <asm/iommu.h>
#include <asm/serial.h>
#include <asm/cache.h>
#include <asm/page.h>
#include <asm/mmu.h>
#include <asm/xmon.h>
#include <asm/cputhreads.h>
#include <mm/mmu_decl.h>

#include "setup.h"

#ifdef DEBUG
#include <asm/udbg.h>
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif

/* The main machine-dep calls structure
 */
struct machdep_calls ppc_md;
EXPORT_SYMBOL(ppc_md);
struct machdep_calls *machine_id;
EXPORT_SYMBOL(machine_id);

unsigned long klimit = (unsigned long) _end;

char cmd_line[COMMAND_LINE_SIZE];

/*
 * This still seems to be needed... -- paulus
 */ 
struct screen_info screen_info = {
        .orig_x = 0,
        .orig_y = 25,
        .orig_video_cols = 80,
        .orig_video_lines = 25,
        .orig_video_isVGA = 1,
        .orig_video_points = 16
};

#ifdef __DO_IRQ_CANON
/* XXX should go elsewhere eventually */
int ppc_do_canonicalize_irqs;
EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
#endif

/* also used by kexec */
void machine_shutdown(void)
{
        if (ppc_md.machine_shutdown)
                ppc_md.machine_shutdown();
}

void machine_restart(char *cmd)
{
        machine_shutdown();
        if (ppc_md.restart)
                ppc_md.restart(cmd);
#ifdef CONFIG_SMP
        smp_send_stop();
#endif
        printk(KERN_EMERG "System Halted, OK to turn off power\n");
        local_irq_disable();
        while (1) ;
}

void machine_power_off(void)
{
        machine_shutdown();
        if (ppc_md.power_off)
                ppc_md.power_off();
#ifdef CONFIG_SMP
        smp_send_stop();
#endif
        printk(KERN_EMERG "System Halted, OK to turn off power\n");
        local_irq_disable();
        while (1) ;
}
/* Used by the G5 thermal driver */
EXPORT_SYMBOL_GPL(machine_power_off);

void (*pm_power_off)(void) = machine_power_off;
EXPORT_SYMBOL_GPL(pm_power_off);

void machine_halt(void)
{
        machine_shutdown();
        if (ppc_md.halt)
                ppc_md.halt();
#ifdef CONFIG_SMP
        smp_send_stop();
#endif
        printk(KERN_EMERG "System Halted, OK to turn off power\n");
        local_irq_disable();
        while (1) ;
}


#ifdef CONFIG_TAU
extern u32 cpu_temp(unsigned long cpu);
extern u32 cpu_temp_both(unsigned long cpu);
#endif /* CONFIG_TAU */

#ifdef CONFIG_SMP
DEFINE_PER_CPU(unsigned int, pvr);
#endif

static int show_cpuinfo(struct seq_file *m, void *v)
{
        unsigned long cpu_id = (unsigned long)v - 1;
        unsigned int pvr;
        unsigned short maj;
        unsigned short min;

        if (cpu_id == NR_CPUS) {
                struct device_node *root;
                const char *model = NULL;
#if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
                unsigned long bogosum = 0;
                int i;
                for_each_online_cpu(i)
                        bogosum += loops_per_jiffy;
                seq_printf(m, "total bogomips\t: %lu.%02lu\n",
                           bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
#endif /* CONFIG_SMP && CONFIG_PPC32 */
                seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
                if (ppc_md.name)
                        seq_printf(m, "platform\t: %s\n", ppc_md.name);
                root = of_find_node_by_path("/");
                if (root)
                        model = of_get_property(root, "model", NULL);
                if (model)
                        seq_printf(m, "model\t\t: %s\n", model);
                of_node_put(root);

                if (ppc_md.show_cpuinfo != NULL)
                        ppc_md.show_cpuinfo(m);

#ifdef CONFIG_PPC32
                /* Display the amount of memory */
                seq_printf(m, "Memory\t\t: %d MB\n",
                           (unsigned int)(total_memory / (1024 * 1024)));
#endif

                return 0;
        }

        /* We only show online cpus: disable preempt (overzealous, I
         * knew) to prevent cpu going down. */
        preempt_disable();
        if (!cpu_online(cpu_id)) {
                preempt_enable();
                return 0;
        }

#ifdef CONFIG_SMP
        pvr = per_cpu(pvr, cpu_id);
#else
        pvr = mfspr(SPRN_PVR);
#endif
        maj = (pvr >> 8) & 0xFF;
        min = pvr & 0xFF;

        seq_printf(m, "processor\t: %lu\n", cpu_id);
        seq_printf(m, "cpu\t\t: ");

        if (cur_cpu_spec->pvr_mask)
                seq_printf(m, "%s", cur_cpu_spec->cpu_name);
        else
                seq_printf(m, "unknown (%08x)", pvr);

#ifdef CONFIG_ALTIVEC
        if (cpu_has_feature(CPU_FTR_ALTIVEC))
                seq_printf(m, ", altivec supported");
#endif /* CONFIG_ALTIVEC */

        seq_printf(m, "\n");

#ifdef CONFIG_TAU
        if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
#ifdef CONFIG_TAU_AVERAGE
                /* more straightforward, but potentially misleading */
                seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
                           cpu_temp(cpu_id));
#else
                /* show the actual temp sensor range */
                u32 temp;
                temp = cpu_temp_both(cpu_id);
                seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
                           temp & 0xff, temp >> 16);
#endif
        }
#endif /* CONFIG_TAU */

        /*
         * Assume here that all clock rates are the same in a
         * smp system.  -- Cort
         */
        if (ppc_proc_freq)
                seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
                           ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);

        if (ppc_md.show_percpuinfo != NULL)
                ppc_md.show_percpuinfo(m, cpu_id);

        /* If we are a Freescale core do a simple check so
         * we dont have to keep adding cases in the future */
        if (PVR_VER(pvr) & 0x8000) {
                switch (PVR_VER(pvr)) {
                case 0x8000:    /* 7441/7450/7451, Voyager */
                case 0x8001:    /* 7445/7455, Apollo 6 */
                case 0x8002:    /* 7447/7457, Apollo 7 */
                case 0x8003:    /* 7447A, Apollo 7 PM */
                case 0x8004:    /* 7448, Apollo 8 */
                case 0x800c:    /* 7410, Nitro */
                        maj = ((pvr >> 8) & 0xF);
                        min = PVR_MIN(pvr);
                        break;
                default:        /* e500/book-e */
                        maj = PVR_MAJ(pvr);
                        min = PVR_MIN(pvr);
                        break;
                }
        } else {
                switch (PVR_VER(pvr)) {
                        case 0x0020:    /* 403 family */
                                maj = PVR_MAJ(pvr) + 1;
                                min = PVR_MIN(pvr);
                                break;
                        case 0x1008:    /* 740P/750P ?? */
                                maj = ((pvr >> 8) & 0xFF) - 1;
                                min = pvr & 0xFF;
                                break;
                        default:
                                maj = (pvr >> 8) & 0xFF;
                                min = pvr & 0xFF;
                                break;
                }
        }

        seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
                   maj, min, PVR_VER(pvr), PVR_REV(pvr));

#ifdef CONFIG_PPC32
        seq_printf(m, "bogomips\t: %lu.%02lu\n",
                   loops_per_jiffy / (500000/HZ),
                   (loops_per_jiffy / (5000/HZ)) % 100);
#endif

#ifdef CONFIG_SMP
        seq_printf(m, "\n");
#endif

        preempt_enable();
        return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
        unsigned long i = *pos;

        return i <= NR_CPUS ? (void *)(i + 1) : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
        ++*pos;
        return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

const struct seq_operations cpuinfo_op = {
        .start =c_start,
        .next = c_next,
        .stop = c_stop,
        .show = show_cpuinfo,
};

void __init check_for_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
        DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
            initrd_start, initrd_end);

        /* If we were passed an initrd, set the ROOT_DEV properly if the values
         * look sensible. If not, clear initrd reference.
         */
        if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
            initrd_end > initrd_start)
                ROOT_DEV = Root_RAM0;
        else
                initrd_start = initrd_end = 0;

        if (initrd_start)
                printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);

        DBG(" <- check_for_initrd()\n");
#endif /* CONFIG_BLK_DEV_INITRD */
}

#ifdef CONFIG_SMP

int threads_per_core, threads_shift;
cpumask_t threads_core_mask;

static void __init cpu_init_thread_core_maps(int tpc)
{
        int i;

        threads_per_core = tpc;
        threads_core_mask = CPU_MASK_NONE;

        /* This implementation only supports power of 2 number of threads
         * for simplicity and performance
         */
        threads_shift = ilog2(tpc);
        BUG_ON(tpc != (1 << threads_shift));

        for (i = 0; i < tpc; i++)
                cpu_set(i, threads_core_mask);

        printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
               tpc, tpc > 1 ? "s" : "");
        printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
}


/**
 * setup_cpu_maps - initialize the following cpu maps:
 *                  cpu_possible_map
 *                  cpu_present_map
 *
 * Having the possible map set up early allows us to restrict allocations
 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 *
 * We do not initialize the online map here; cpus set their own bits in
 * cpu_online_map as they come up.
 *
 * This function is valid only for Open Firmware systems.  finish_device_tree
 * must be called before using this.
 *
 * While we're here, we may as well set the "physical" cpu ids in the paca.
 *
 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 */
void __init smp_setup_cpu_maps(void)
{
        struct device_node *dn = NULL;
        int cpu = 0;
        int nthreads = 1;

        DBG("smp_setup_cpu_maps()\n");

        while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
                const int *intserv;
                int j, len;

                DBG("  * %s...\n", dn->full_name);

                intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
                                &len);
                if (intserv) {
                        nthreads = len / sizeof(int);
                        DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
                            nthreads);
                } else {
                        DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
                        intserv = of_get_property(dn, "reg", NULL);
                        if (!intserv)
                                intserv = &cpu; /* assume logical == phys */
                }

                for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
                        DBG("    thread %d -> cpu %d (hard id %d)\n",
                            j, cpu, intserv[j]);
                        set_cpu_present(cpu, true);
                        set_hard_smp_processor_id(cpu, intserv[j]);
                        set_cpu_possible(cpu, true);
                        cpu++;
                }
        }

        /* If no SMT supported, nthreads is forced to 1 */
        if (!cpu_has_feature(CPU_FTR_SMT)) {
                DBG("  SMT disabled ! nthreads forced to 1\n");
                nthreads = 1;
        }

#ifdef CONFIG_PPC64
        /*
         * On pSeries LPAR, we need to know how many cpus
         * could possibly be added to this partition.
         */
        if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
            (dn = of_find_node_by_path("/rtas"))) {
                int num_addr_cell, num_size_cell, maxcpus;
                const unsigned int *ireg;

                num_addr_cell = of_n_addr_cells(dn);
                num_size_cell = of_n_size_cells(dn);

                ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);

                if (!ireg)
                        goto out;

                maxcpus = ireg[num_addr_cell + num_size_cell];

                /* Double maxcpus for processors which have SMT capability */
                if (cpu_has_feature(CPU_FTR_SMT))
                        maxcpus *= nthreads;

                if (maxcpus > NR_CPUS) {
                        printk(KERN_WARNING
                               "Partition configured for %d cpus, "
                               "operating system maximum is %d.\n",
                               maxcpus, NR_CPUS);
                        maxcpus = NR_CPUS;
                } else
                        printk(KERN_INFO "Partition configured for %d cpus.\n",
                               maxcpus);

                for (cpu = 0; cpu < maxcpus; cpu++)
                        set_cpu_possible(cpu, true);
        out:
                of_node_put(dn);
        }
        vdso_data->processorCount = num_present_cpus();
#endif /* CONFIG_PPC64 */

        /* Initialize CPU <=> thread mapping/
         *
         * WARNING: We assume that the number of threads is the same for
         * every CPU in the system. If that is not the case, then some code
         * here will have to be reworked
         */
        cpu_init_thread_core_maps(nthreads);
}
#endif /* CONFIG_SMP */

#ifdef CONFIG_PCSPKR_PLATFORM
static __init int add_pcspkr(void)
{
        struct device_node *np;
        struct platform_device *pd;
        int ret;

        np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
        of_node_put(np);
        if (!np)
                return -ENODEV;

        pd = platform_device_alloc("pcspkr", -1);
        if (!pd)
                return -ENOMEM;

        ret = platform_device_add(pd);
        if (ret)
                platform_device_put(pd);

        return ret;
}
device_initcall(add_pcspkr);
#endif  /* CONFIG_PCSPKR_PLATFORM */

void probe_machine(void)
{
        extern struct machdep_calls __machine_desc_start;
        extern struct machdep_calls __machine_desc_end;

        /*
         * Iterate all ppc_md structures until we find the proper
         * one for the current machine type
         */
        DBG("Probing machine type ...\n");

        for (machine_id = &__machine_desc_start;
             machine_id < &__machine_desc_end;
             machine_id++) {
                DBG("  %s ...", machine_id->name);
                memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
                if (ppc_md.probe()) {
                        DBG(" match !\n");
                        break;
                }
                DBG("\n");
        }
        /* What can we do if we didn't find ? */
        if (machine_id >= &__machine_desc_end) {
                DBG("No suitable machine found !\n");
                for (;;);
        }

        printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
}

/* Match a class of boards, not a specific device configuration. */
int check_legacy_ioport(unsigned long base_port)
{
        struct device_node *parent, *np = NULL;
        int ret = -ENODEV;

        switch(base_port) {
        case I8042_DATA_REG:
                if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
                        np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
                if (np) {
                        parent = of_get_parent(np);
                        of_node_put(np);
                        np = parent;
                        break;
                }
                np = of_find_node_by_type(NULL, "8042");
                /* Pegasos has no device_type on its 8042 node, look for the
                 * name instead */
                if (!np)
                        np = of_find_node_by_name(NULL, "8042");
                break;
        case FDC_BASE: /* FDC1 */
                np = of_find_node_by_type(NULL, "fdc");
                break;
#ifdef CONFIG_PPC_PREP
        case _PIDXR:
        case _PNPWRP:
        case PNPBIOS_BASE:
                /* implement me */
#endif
        default:
                /* ipmi is supposed to fail here */
                break;
        }
        if (!np)
                return ret;
        parent = of_get_parent(np);
        if (parent) {
                if (strcmp(parent->type, "isa") == 0)
                        ret = 0;
                of_node_put(parent);
        }
        of_node_put(np);
        return ret;
}
EXPORT_SYMBOL(check_legacy_ioport);

static int ppc_panic_event(struct notifier_block *this,
                             unsigned long event, void *ptr)
{
        ppc_md.panic(ptr);  /* May not return */
        return NOTIFY_DONE;
}

static struct notifier_block ppc_panic_block = {
        .notifier_call = ppc_panic_event,
        .priority = INT_MIN /* may not return; must be done last */
};

void __init setup_panic(void)
{
        atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
}

#ifdef CONFIG_CHECK_CACHE_COHERENCY
/*
 * For platforms that have configurable cache-coherency.  This function
 * checks that the cache coherency setting of the kernel matches the setting
 * left by the firmware, as indicated in the device tree.  Since a mismatch
 * will eventually result in DMA failures, we print * and error and call
 * BUG() in that case.
 */

#ifdef CONFIG_NOT_COHERENT_CACHE
#define KERNEL_COHERENCY        0
#else
#define KERNEL_COHERENCY        1
#endif

static int __init check_cache_coherency(void)
{
        struct device_node *np;
        const void *prop;
        int devtree_coherency;

        np = of_find_node_by_path("/");
        prop = of_get_property(np, "coherency-off", NULL);
        of_node_put(np);

        devtree_coherency = prop ? 0 : 1;

        if (devtree_coherency != KERNEL_COHERENCY) {
                printk(KERN_ERR
                        "kernel coherency:%s != device tree_coherency:%s\n",
                        KERNEL_COHERENCY ? "on" : "off",
                        devtree_coherency ? "on" : "off");
                BUG();
        }

        return 0;
}

late_initcall(check_cache_coherency);
#endif /* CONFIG_CHECK_CACHE_COHERENCY */

#ifdef CONFIG_DEBUG_FS
struct dentry *powerpc_debugfs_root;

static int powerpc_debugfs_init(void)
{
        powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);

        return powerpc_debugfs_root == NULL;
}
arch_initcall(powerpc_debugfs_init);
#endif

static int ppc_dflt_bus_notify(struct notifier_block *nb,
                                unsigned long action, void *data)
{
        struct device *dev = data;

        /* We are only intereted in device addition */
        if (action != BUS_NOTIFY_ADD_DEVICE)
                return 0;

        set_dma_ops(dev, &dma_direct_ops);

        return NOTIFY_DONE;
}

static struct notifier_block ppc_dflt_plat_bus_notifier = {
        .notifier_call = ppc_dflt_bus_notify,
        .priority = INT_MAX,
};

static struct notifier_block ppc_dflt_of_bus_notifier = {
        .notifier_call = ppc_dflt_bus_notify,
        .priority = INT_MAX,
};

static int __init setup_bus_notifier(void)
{
        bus_register_notifier(&platform_bus_type, &ppc_dflt_plat_bus_notifier);
        bus_register_notifier(&of_platform_bus_type, &ppc_dflt_of_bus_notifier);

        return 0;
}

arch_initcall(setup_bus_notifier);