/*
 *  Powermac setup and early boot code plus other random bits.
 *
 *  PowerPC version
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *
 *  Adapted for Power Macintosh by Paul Mackerras
 *    Copyright (C) 1996 Paul Mackerras (paulus@samba.org)
 *
 *  Derived from "arch/alpha/kernel/setup.c"
 *    Copyright (C) 1995 Linus Torvalds
 *
 *  Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
 *
 *  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.
 *
 */

/*
 * bootup setup stuff..
 */

#include <linux/init.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/tty.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/major.h>
#include <linux/initrd.h>
#include <linux/vt_kern.h>
#include <linux/console.h>
#include <linux/pci.h>
#include <linux/adb.h>
#include <linux/cuda.h>
#include <linux/pmu.h>
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/bitops.h>
#include <linux/suspend.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/lmb.h>

#include <asm/reg.h>
#include <asm/sections.h>
#include <asm/prom.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/pci-bridge.h>
#include <asm/ohare.h>
#include <asm/mediabay.h>
#include <asm/machdep.h>
#include <asm/dma.h>
#include <asm/cputable.h>
#include <asm/btext.h>
#include <asm/pmac_feature.h>
#include <asm/time.h>
#include <asm/mmu_context.h>
#include <asm/iommu.h>
#include <asm/smu.h>
#include <asm/pmc.h>
#include <asm/udbg.h>

#include "pmac.h"

#undef SHOW_GATWICK_IRQS

int ppc_override_l2cr = 0;
int ppc_override_l2cr_value;
int has_l2cache = 0;

int pmac_newworld;

static int current_root_goodness = -1;

extern struct machdep_calls pmac_md;

#define DEFAULT_ROOT_DEVICE Root_SDA1   /* sda1 - slightly silly choice */

#ifdef CONFIG_PPC64
int sccdbg;
#endif

sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
EXPORT_SYMBOL(sys_ctrler);

#ifdef CONFIG_PMAC_SMU
unsigned long smu_cmdbuf_abs;
EXPORT_SYMBOL(smu_cmdbuf_abs);
#endif

static void pmac_show_cpuinfo(struct seq_file *m)
{
        struct device_node *np;
        const char *pp;
        int plen;
        int mbmodel;
        unsigned int mbflags;
        char* mbname;

        mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
                                    PMAC_MB_INFO_MODEL, 0);
        mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
                                    PMAC_MB_INFO_FLAGS, 0);
        if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
                              (long) &mbname) != 0)
                mbname = "Unknown";

        /* find motherboard type */
        seq_printf(m, "machine\t\t: ");
        np = of_find_node_by_path("/");
        if (np != NULL) {
                pp = of_get_property(np, "model", NULL);
                if (pp != NULL)
                        seq_printf(m, "%s\n", pp);
                else
                        seq_printf(m, "PowerMac\n");
                pp = of_get_property(np, "compatible", &plen);
                if (pp != NULL) {
                        seq_printf(m, "motherboard\t:");
                        while (plen > 0) {
                                int l = strlen(pp) + 1;
                                seq_printf(m, " %s", pp);
                                plen -= l;
                                pp += l;
                        }
                        seq_printf(m, "\n");
                }
                of_node_put(np);
        } else
                seq_printf(m, "PowerMac\n");

        /* print parsed model */
        seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
        seq_printf(m, "pmac flags\t: %08x\n", mbflags);

        /* find l2 cache info */
        np = of_find_node_by_name(NULL, "l2-cache");
        if (np == NULL)
                np = of_find_node_by_type(NULL, "cache");
        if (np != NULL) {
                const unsigned int *ic =
                        of_get_property(np, "i-cache-size", NULL);
                const unsigned int *dc =
                        of_get_property(np, "d-cache-size", NULL);
                seq_printf(m, "L2 cache\t:");
                has_l2cache = 1;
                if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
                        seq_printf(m, " %dK unified", *dc / 1024);
                } else {
                        if (ic)
                                seq_printf(m, " %dK instruction", *ic / 1024);
                        if (dc)
                                seq_printf(m, "%s %dK data",
                                           (ic? " +": ""), *dc / 1024);
                }
                pp = of_get_property(np, "ram-type", NULL);
                if (pp)
                        seq_printf(m, " %s", pp);
                seq_printf(m, "\n");
                of_node_put(np);
        }

        /* Indicate newworld/oldworld */
        seq_printf(m, "pmac-generation\t: %s\n",
                   pmac_newworld ? "NewWorld" : "OldWorld");
}

#ifndef CONFIG_ADB_CUDA
int find_via_cuda(void)
{
        struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");

        if (!dn)
                return 0;
        of_node_put(dn);
        printk("WARNING ! Your machine is CUDA-based but your kernel\n");
        printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
        return 0;
}
#endif

#ifndef CONFIG_ADB_PMU
int find_via_pmu(void)
{
        struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");

        if (!dn)
                return 0;
        of_node_put(dn);
        printk("WARNING ! Your machine is PMU-based but your kernel\n");
        printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
        return 0;
}
#endif

#ifndef CONFIG_PMAC_SMU
int smu_init(void)
{
        /* should check and warn if SMU is present */
        return 0;
}
#endif

#ifdef CONFIG_PPC32
static volatile u32 *sysctrl_regs;

static void __init ohare_init(void)
{
        struct device_node *dn;

        /* this area has the CPU identification register
           and some registers used by smp boards */
        sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);

        /*
         * Turn on the L2 cache.
         * We assume that we have a PSX memory controller iff
         * we have an ohare I/O controller.
         */
        dn = of_find_node_by_name(NULL, "ohare");
        if (dn) {
                of_node_put(dn);
                if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
                        if (sysctrl_regs[4] & 0x10)
                                sysctrl_regs[4] |= 0x04000020;
                        else
                                sysctrl_regs[4] |= 0x04000000;
                        if(has_l2cache)
                                printk(KERN_INFO "Level 2 cache enabled\n");
                }
        }
}

static void __init l2cr_init(void)
{
        /* Checks "l2cr-value" property in the registry */
        if (cpu_has_feature(CPU_FTR_L2CR)) {
                struct device_node *np = of_find_node_by_name(NULL, "cpus");
                if (np == 0)
                        np = of_find_node_by_type(NULL, "cpu");
                if (np != 0) {
                        const unsigned int *l2cr =
                                of_get_property(np, "l2cr-value", NULL);
                        if (l2cr != 0) {
                                ppc_override_l2cr = 1;
                                ppc_override_l2cr_value = *l2cr;
                                _set_L2CR(0);
                                _set_L2CR(ppc_override_l2cr_value);
                        }
                        of_node_put(np);
                }
        }

        if (ppc_override_l2cr)
                printk(KERN_INFO "L2CR overridden (0x%x), "
                       "backside cache is %s\n",
                       ppc_override_l2cr_value,
                       (ppc_override_l2cr_value & 0x80000000)
                                ? "enabled" : "disabled");
}
#endif

static void __init pmac_setup_arch(void)
{
        struct device_node *cpu, *ic;
        const int *fp;
        unsigned long pvr;

        pvr = PVR_VER(mfspr(SPRN_PVR));

        /* Set loops_per_jiffy to a half-way reasonable value,
           for use until calibrate_delay gets called. */
        loops_per_jiffy = 50000000 / HZ;
        cpu = of_find_node_by_type(NULL, "cpu");
        if (cpu != NULL) {
                fp = of_get_property(cpu, "clock-frequency", NULL);
                if (fp != NULL) {
                        if (pvr >= 0x30 && pvr < 0x80)
                                /* PPC970 etc. */
                                loops_per_jiffy = *fp / (3 * HZ);
                        else if (pvr == 4 || pvr >= 8)
                                /* 604, G3, G4 etc. */
                                loops_per_jiffy = *fp / HZ;
                        else
                                /* 601, 603, etc. */
                                loops_per_jiffy = *fp / (2 * HZ);
                }
                of_node_put(cpu);
        }

        /* See if newworld or oldworld */
        ic = of_find_node_with_property(NULL, "interrupt-controller");
        if (ic) {
                pmac_newworld = 1;
                of_node_put(ic);
        }

        /* Lookup PCI hosts */
        pmac_pci_init();

#ifdef CONFIG_PPC32
        ohare_init();
        l2cr_init();
#endif /* CONFIG_PPC32 */

        find_via_cuda();
        find_via_pmu();
        smu_init();

#if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
    defined(CONFIG_PPC64)
        pmac_nvram_init();
#endif

#ifdef CONFIG_PPC32
#ifdef CONFIG_BLK_DEV_INITRD
        if (initrd_start)
                ROOT_DEV = Root_RAM0;
        else
#endif
                ROOT_DEV = DEFAULT_ROOT_DEVICE;
#endif

#ifdef CONFIG_ADB
        if (strstr(cmd_line, "adb_sync")) {
                extern int __adb_probe_sync;
                __adb_probe_sync = 1;
        }
#endif /* CONFIG_ADB */
}

#ifdef CONFIG_SCSI
void note_scsi_host(struct device_node *node, void *host)
{
}
EXPORT_SYMBOL(note_scsi_host);
#endif

static int initializing = 1;

static int pmac_late_init(void)
{
        initializing = 0;
        /* this is udbg (which is __init) and we can later use it during
         * cpu hotplug (in smp_core99_kick_cpu) */
        ppc_md.progress = NULL;
        return 0;
}
machine_late_initcall(powermac, pmac_late_init);

/*
 * This is __init_refok because we check for "initializing" before
 * touching any of the __init sensitive things and "initializing"
 * will be false after __init time. This can't be __init because it
 * can be called whenever a disk is first accessed.
 */
void __init_refok note_bootable_part(dev_t dev, int part, int goodness)
{
        char *p;

        if (!initializing)
                return;
        if ((goodness <= current_root_goodness) &&
            ROOT_DEV != DEFAULT_ROOT_DEVICE)
                return;
        p = strstr(boot_command_line, "root=");
        if (p != NULL && (p == boot_command_line || p[-1] == ' '))
                return;

        ROOT_DEV = dev + part;
        current_root_goodness = goodness;
}

#ifdef CONFIG_ADB_CUDA
static void cuda_restart(void)
{
        struct adb_request req;

        cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
        for (;;)
                cuda_poll();
}

static void cuda_shutdown(void)
{
        struct adb_request req;

        cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
        for (;;)
                cuda_poll();
}

#else
#define cuda_restart()
#define cuda_shutdown()
#endif

#ifndef CONFIG_ADB_PMU
#define pmu_restart()
#define pmu_shutdown()
#endif

#ifndef CONFIG_PMAC_SMU
#define smu_restart()
#define smu_shutdown()
#endif

static void pmac_restart(char *cmd)
{
        switch (sys_ctrler) {
        case SYS_CTRLER_CUDA:
                cuda_restart();
                break;
        case SYS_CTRLER_PMU:
                pmu_restart();
                break;
        case SYS_CTRLER_SMU:
                smu_restart();
                break;
        default: ;
        }
}

static void pmac_power_off(void)
{
        switch (sys_ctrler) {
        case SYS_CTRLER_CUDA:
                cuda_shutdown();
                break;
        case SYS_CTRLER_PMU:
                pmu_shutdown();
                break;
        case SYS_CTRLER_SMU:
                smu_shutdown();
                break;
        default: ;
        }
}

static void
pmac_halt(void)
{
        pmac_power_off();
}

/* 
 * Early initialization.
 */
static void __init pmac_init_early(void)
{
        /* Enable early btext debug if requested */
        if (strstr(cmd_line, "btextdbg")) {
                udbg_adb_init_early();
                register_early_udbg_console();
        }

        /* Probe motherboard chipset */
        pmac_feature_init();

        /* Initialize debug stuff */
        udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
        udbg_adb_init(!!strstr(cmd_line, "btextdbg"));

#ifdef CONFIG_PPC64
        iommu_init_early_dart();
#endif

        /* SMP Init has to be done early as we need to patch up
         * cpu_possible_map before interrupt stacks are allocated
         * or kaboom...
         */
#ifdef CONFIG_SMP
        pmac_setup_smp();
#endif
}

static int __init pmac_declare_of_platform_devices(void)
{
        struct device_node *np;

        if (machine_is(chrp))
                return -1;

        np = of_find_node_by_name(NULL, "valkyrie");
        if (np)
                of_platform_device_create(np, "valkyrie", NULL);
        np = of_find_node_by_name(NULL, "platinum");
        if (np)
                of_platform_device_create(np, "platinum", NULL);
        np = of_find_node_by_type(NULL, "smu");
        if (np) {
                of_platform_device_create(np, "smu", NULL);
                of_node_put(np);
        }

        return 0;
}
machine_device_initcall(powermac, pmac_declare_of_platform_devices);

#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
/*
 * This is called very early, as part of console_init() (typically just after
 * time_init()). This function is respondible for trying to find a good
 * default console on serial ports. It tries to match the open firmware
 * default output with one of the available serial console drivers.
 */
static int __init check_pmac_serial_console(void)
{
        struct device_node *prom_stdout = NULL;
        int offset = 0;
        const char *name;
#ifdef CONFIG_SERIAL_PMACZILOG_TTYS
        char *devname = "ttyS";
#else
        char *devname = "ttyPZ";
#endif

        pr_debug(" -> check_pmac_serial_console()\n");

        /* The user has requested a console so this is already set up. */
        if (strstr(boot_command_line, "console=")) {
                pr_debug(" console was specified !\n");
                return -EBUSY;
        }

        if (!of_chosen) {
                pr_debug(" of_chosen is NULL !\n");
                return -ENODEV;
        }

        /* We are getting a weird phandle from OF ... */
        /* ... So use the full path instead */
        name = of_get_property(of_chosen, "linux,stdout-path", NULL);
        if (name == NULL) {
                pr_debug(" no linux,stdout-path !\n");
                return -ENODEV;
        }
        prom_stdout = of_find_node_by_path(name);
        if (!prom_stdout) {
                pr_debug(" can't find stdout package %s !\n", name);
                return -ENODEV;
        }
        pr_debug("stdout is %s\n", prom_stdout->full_name);

        name = of_get_property(prom_stdout, "name", NULL);
        if (!name) {
                pr_debug(" stdout package has no name !\n");
                goto not_found;
        }

        if (strcmp(name, "ch-a") == 0)
                offset = 0;
        else if (strcmp(name, "ch-b") == 0)
                offset = 1;
        else
                goto not_found;
        of_node_put(prom_stdout);

        pr_debug("Found serial console at %s%d\n", devname, offset);

        return add_preferred_console(devname, offset, NULL);

 not_found:
        pr_debug("No preferred console found !\n");
        of_node_put(prom_stdout);
        return -ENODEV;
}
console_initcall(check_pmac_serial_console);

#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */

/*
 * Called very early, MMU is off, device-tree isn't unflattened
 */
static int __init pmac_probe(void)
{
        unsigned long root = of_get_flat_dt_root();

        if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
            !of_flat_dt_is_compatible(root, "MacRISC"))
                return 0;

#ifdef CONFIG_PPC64
        /*
         * On U3, the DART (iommu) must be allocated now since it
         * has an impact on htab_initialize (due to the large page it
         * occupies having to be broken up so the DART itself is not
         * part of the cacheable linar mapping
         */
        alloc_dart_table();

        hpte_init_native();
#endif

#ifdef CONFIG_PPC32
        /* isa_io_base gets set in pmac_pci_init */
        ISA_DMA_THRESHOLD = ~0L;
        DMA_MODE_READ = 1;
        DMA_MODE_WRITE = 2;
#endif /* CONFIG_PPC32 */

#ifdef CONFIG_PMAC_SMU
        /*
         * SMU based G5s need some memory below 2Gb, at least the current
         * driver needs that. We have to allocate it now. We allocate 4k
         * (1 small page) for now.
         */
        smu_cmdbuf_abs = lmb_alloc_base(4096, 4096, 0x80000000UL);
#endif /* CONFIG_PMAC_SMU */

        return 1;
}

#ifdef CONFIG_PPC64
/* Move that to pci.c */
static int pmac_pci_probe_mode(struct pci_bus *bus)
{
        struct device_node *node = pci_bus_to_OF_node(bus);

        /* We need to use normal PCI probing for the AGP bus,
         * since the device for the AGP bridge isn't in the tree.
         * Same for the PCIe host on U4 and the HT host bridge.
         */
        if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
                                  of_device_is_compatible(node, "u4-pcie") ||
                                  of_device_is_compatible(node, "u3-ht")))
                return PCI_PROBE_NORMAL;
        return PCI_PROBE_DEVTREE;
}

#ifdef CONFIG_HOTPLUG_CPU
/* access per cpu vars from generic smp.c */
DECLARE_PER_CPU(int, cpu_state);

static void pmac_cpu_die(void)
{
        /*
         * turn off as much as possible, we'll be
         * kicked out as this will only be invoked
         * on core99 platforms for now ...
         */

        printk(KERN_INFO "CPU#%d offline\n", smp_processor_id());
        __get_cpu_var(cpu_state) = CPU_DEAD;
        smp_wmb();

        /*
         * during the path that leads here preemption is disabled,
         * reenable it now so that when coming up preempt count is
         * zero correctly
         */
        preempt_enable();

        /*
         * hard-disable interrupts for the non-NAP case, the NAP code
         * needs to re-enable interrupts (but soft-disables them)
         */
        hard_irq_disable();

        while (1) {
                /* let's not take timer interrupts too often ... */
                set_dec(0x7fffffff);

                /* should always be true at this point */
                if (cpu_has_feature(CPU_FTR_CAN_NAP))
                        power4_cpu_offline_powersave();
                else {
                        HMT_low();
                        HMT_very_low();
                }
        }
}
#endif /* CONFIG_HOTPLUG_CPU */

#endif /* CONFIG_PPC64 */

define_machine(powermac) {
        .name                   = "PowerMac",
        .probe                  = pmac_probe,
        .setup_arch             = pmac_setup_arch,
        .init_early             = pmac_init_early,
        .show_cpuinfo           = pmac_show_cpuinfo,
        .init_IRQ               = pmac_pic_init,
        .get_irq                = NULL, /* changed later */
        .pci_irq_fixup          = pmac_pci_irq_fixup,
        .restart                = pmac_restart,
        .power_off              = pmac_power_off,
        .halt                   = pmac_halt,
        .time_init              = pmac_time_init,
        .get_boot_time          = pmac_get_boot_time,
        .set_rtc_time           = pmac_set_rtc_time,
        .get_rtc_time           = pmac_get_rtc_time,
        .calibrate_decr         = pmac_calibrate_decr,
        .feature_call           = pmac_do_feature_call,
        .progress               = udbg_progress,
#ifdef CONFIG_PPC64
        .pci_probe_mode         = pmac_pci_probe_mode,
        .power_save             = power4_idle,
        .enable_pmcs            = power4_enable_pmcs,
#endif /* CONFIG_PPC64 */
#ifdef CONFIG_PPC32
        .pcibios_enable_device_hook = pmac_pci_enable_device_hook,
        .pcibios_after_init     = pmac_pcibios_after_init,
        .phys_mem_access_prot   = pci_phys_mem_access_prot,
#endif
#if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC64)
        .cpu_die                = pmac_cpu_die,
#endif
#if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32)
        .cpu_die                = generic_mach_cpu_die,
#endif
};