/*
 * Procedures for creating, accessing and interpreting the device tree.
 *
 * Paul Mackerras       August 1996.
 * Copyright (C) 1996-2005 Paul Mackerras.
 * 
 *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
 *    {engebret|bergner}@us.ibm.com 
 *
 *  Adapted for sparc64 by David S. Miller davem@davemloft.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/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/memblock.h>
#include <linux/of.h>

#include <asm/prom.h>
#include <asm/oplib.h>
#include <asm/irq.h>
#include <asm/asi.h>
#include <asm/upa.h>
#include <asm/smp.h>

#include "prom.h"

void * __init prom_early_alloc(unsigned long size)
{
        unsigned long paddr = memblock_alloc(size, SMP_CACHE_BYTES);
        void *ret;

        if (!paddr) {
                prom_printf("prom_early_alloc(%lu) failed\n");
                prom_halt();
        }

        ret = __va(paddr);
        memset(ret, 0, size);
        prom_early_allocated += size;

        return ret;
}

/* The following routines deal with the black magic of fully naming a
 * node.
 *
 * Certain well known named nodes are just the simple name string.
 *
 * Actual devices have an address specifier appended to the base name
 * string, like this "foo@addr".  The "addr" can be in any number of
 * formats, and the platform plus the type of the node determine the
 * format and how it is constructed.
 *
 * For children of the ROOT node, the naming convention is fixed and
 * determined by whether this is a sun4u or sun4v system.
 *
 * For children of other nodes, it is bus type specific.  So
 * we walk up the tree until we discover a "device_type" property
 * we recognize and we go from there.
 *
 * As an example, the boot device on my workstation has a full path:
 *
 *      /pci@1e,600000/ide@d/disk@0,0:c
 */
static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf)
{
        struct linux_prom64_registers *regs;
        struct property *rprop;
        u32 high_bits, low_bits, type;

        rprop = of_find_property(dp, "reg", NULL);
        if (!rprop)
                return;

        regs = rprop->value;
        if (!of_node_is_root(dp->parent)) {
                sprintf(tmp_buf, "%s@%x,%x",
                        dp->name,
                        (unsigned int) (regs->phys_addr >> 32UL),
                        (unsigned int) (regs->phys_addr & 0xffffffffUL));
                return;
        }

        type = regs->phys_addr >> 60UL;
        high_bits = (regs->phys_addr >> 32UL) & 0x0fffffffUL;
        low_bits = (regs->phys_addr & 0xffffffffUL);

        if (type == 0 || type == 8) {
                const char *prefix = (type == 0) ? "m" : "i";

                if (low_bits)
                        sprintf(tmp_buf, "%s@%s%x,%x",
                                dp->name, prefix,
                                high_bits, low_bits);
                else
                        sprintf(tmp_buf, "%s@%s%x",
                                dp->name,
                                prefix,
                                high_bits);
        } else if (type == 12) {
                sprintf(tmp_buf, "%s@%x",
                        dp->name, high_bits);
        }
}

static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf)
{
        struct linux_prom64_registers *regs;
        struct property *prop;

        prop = of_find_property(dp, "reg", NULL);
        if (!prop)
                return;

        regs = prop->value;
        if (!of_node_is_root(dp->parent)) {
                sprintf(tmp_buf, "%s@%x,%x",
                        dp->name,
                        (unsigned int) (regs->phys_addr >> 32UL),
                        (unsigned int) (regs->phys_addr & 0xffffffffUL));
                return;
        }

        prop = of_find_property(dp, "upa-portid", NULL);
        if (!prop)
                prop = of_find_property(dp, "portid", NULL);
        if (prop) {
                unsigned long mask = 0xffffffffUL;

                if (tlb_type >= cheetah)
                        mask = 0x7fffff;

                sprintf(tmp_buf, "%s@%x,%x",
                        dp->name,
                        *(u32 *)prop->value,
                        (unsigned int) (regs->phys_addr & mask));
        }
}

/* "name@slot,offset"  */
static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
{
        struct linux_prom_registers *regs;
        struct property *prop;

        prop = of_find_property(dp, "reg", NULL);
        if (!prop)
                return;

        regs = prop->value;
        sprintf(tmp_buf, "%s@%x,%x",
                dp->name,
                regs->which_io,
                regs->phys_addr);
}

/* "name@devnum[,func]" */
static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
{
        struct linux_prom_pci_registers *regs;
        struct property *prop;
        unsigned int devfn;

        prop = of_find_property(dp, "reg", NULL);
        if (!prop)
                return;

        regs = prop->value;
        devfn = (regs->phys_hi >> 8) & 0xff;
        if (devfn & 0x07) {
                sprintf(tmp_buf, "%s@%x,%x",
                        dp->name,
                        devfn >> 3,
                        devfn & 0x07);
        } else {
                sprintf(tmp_buf, "%s@%x",
                        dp->name,
                        devfn >> 3);
        }
}

/* "name@UPA_PORTID,offset" */
static void __init upa_path_component(struct device_node *dp, char *tmp_buf)
{
        struct linux_prom64_registers *regs;
        struct property *prop;

        prop = of_find_property(dp, "reg", NULL);
        if (!prop)
                return;

        regs = prop->value;

        prop = of_find_property(dp, "upa-portid", NULL);
        if (!prop)
                return;

        sprintf(tmp_buf, "%s@%x,%x",
                dp->name,
                *(u32 *) prop->value,
                (unsigned int) (regs->phys_addr & 0xffffffffUL));
}

/* "name@reg" */
static void __init vdev_path_component(struct device_node *dp, char *tmp_buf)
{
        struct property *prop;
        u32 *regs;

        prop = of_find_property(dp, "reg", NULL);
        if (!prop)
                return;

        regs = prop->value;

        sprintf(tmp_buf, "%s@%x", dp->name, *regs);
}

/* "name@addrhi,addrlo" */
static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
{
        struct linux_prom64_registers *regs;
        struct property *prop;

        prop = of_find_property(dp, "reg", NULL);
        if (!prop)
                return;

        regs = prop->value;

        sprintf(tmp_buf, "%s@%x,%x",
                dp->name,
                (unsigned int) (regs->phys_addr >> 32UL),
                (unsigned int) (regs->phys_addr & 0xffffffffUL));
}

/* "name@bus,addr" */
static void __init i2c_path_component(struct device_node *dp, char *tmp_buf)
{
        struct property *prop;
        u32 *regs;

        prop = of_find_property(dp, "reg", NULL);
        if (!prop)
                return;

        regs = prop->value;

        /* This actually isn't right... should look at the #address-cells
         * property of the i2c bus node etc. etc.
         */
        sprintf(tmp_buf, "%s@%x,%x",
                dp->name, regs[0], regs[1]);
}

/* "name@reg0[,reg1]" */
static void __init usb_path_component(struct device_node *dp, char *tmp_buf)
{
        struct property *prop;
        u32 *regs;

        prop = of_find_property(dp, "reg", NULL);
        if (!prop)
                return;

        regs = prop->value;

        if (prop->length == sizeof(u32) || regs[1] == 1) {
                sprintf(tmp_buf, "%s@%x",
                        dp->name, regs[0]);
        } else {
                sprintf(tmp_buf, "%s@%x,%x",
                        dp->name, regs[0], regs[1]);
        }
}

/* "name@reg0reg1[,reg2reg3]" */
static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf)
{
        struct property *prop;
        u32 *regs;

        prop = of_find_property(dp, "reg", NULL);
        if (!prop)
                return;

        regs = prop->value;

        if (regs[2] || regs[3]) {
                sprintf(tmp_buf, "%s@%08x%08x,%04x%08x",
                        dp->name, regs[0], regs[1], regs[2], regs[3]);
        } else {
                sprintf(tmp_buf, "%s@%08x%08x",
                        dp->name, regs[0], regs[1]);
        }
}

static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
{
        struct device_node *parent = dp->parent;

        if (parent != NULL) {
                if (!strcmp(parent->type, "pci") ||
                    !strcmp(parent->type, "pciex")) {
                        pci_path_component(dp, tmp_buf);
                        return;
                }
                if (!strcmp(parent->type, "sbus")) {
                        sbus_path_component(dp, tmp_buf);
                        return;
                }
                if (!strcmp(parent->type, "upa")) {
                        upa_path_component(dp, tmp_buf);
                        return;
                }
                if (!strcmp(parent->type, "ebus")) {
                        ebus_path_component(dp, tmp_buf);
                        return;
                }
                if (!strcmp(parent->name, "usb") ||
                    !strcmp(parent->name, "hub")) {
                        usb_path_component(dp, tmp_buf);
                        return;
                }
                if (!strcmp(parent->type, "i2c")) {
                        i2c_path_component(dp, tmp_buf);
                        return;
                }
                if (!strcmp(parent->type, "firewire")) {
                        ieee1394_path_component(dp, tmp_buf);
                        return;
                }
                if (!strcmp(parent->type, "virtual-devices")) {
                        vdev_path_component(dp, tmp_buf);
                        return;
                }
                /* "isa" is handled with platform naming */
        }

        /* Use platform naming convention.  */
        if (tlb_type == hypervisor) {
                sun4v_path_component(dp, tmp_buf);
                return;
        } else {
                sun4u_path_component(dp, tmp_buf);
        }
}

char * __init build_path_component(struct device_node *dp)
{
        char tmp_buf[64], *n;

        tmp_buf[0] = '\0';
        __build_path_component(dp, tmp_buf);
        if (tmp_buf[0] == '\0')
                strcpy(tmp_buf, dp->name);

        n = prom_early_alloc(strlen(tmp_buf) + 1);
        strcpy(n, tmp_buf);

        return n;
}

static const char *get_mid_prop(void)
{
        return (tlb_type == spitfire ? "upa-portid" : "portid");
}

static void *of_iterate_over_cpus(void *(*func)(struct device_node *, int, int), int arg)
{
        struct device_node *dp;
        const char *mid_prop;

        mid_prop = get_mid_prop();
        for_each_node_by_type(dp, "cpu") {
                int cpuid = of_getintprop_default(dp, mid_prop, -1);
                const char *this_mid_prop = mid_prop;
                void *ret;

                if (cpuid < 0) {
                        this_mid_prop = "cpuid";
                        cpuid = of_getintprop_default(dp, this_mid_prop, -1);
                }
                if (cpuid < 0) {
                        prom_printf("OF: Serious problem, cpu lacks "
                                    "%s property", this_mid_prop);
                        prom_halt();
                }
#ifdef CONFIG_SMP
                if (cpuid >= NR_CPUS) {
                        printk(KERN_WARNING "Ignoring CPU %d which is "
                               ">= NR_CPUS (%d)\n",
                               cpuid, NR_CPUS);
                        continue;
                }
#endif
                ret = func(dp, cpuid, arg);
                if (ret)
                        return ret;
        }
        return NULL;
}

static void *check_cpu_node(struct device_node *dp, int cpuid, int id)
{
        if (id == cpuid)
                return dp;
        return NULL;
}

struct device_node *of_find_node_by_cpuid(int cpuid)
{
        return of_iterate_over_cpus(check_cpu_node, cpuid);
}

static void *record_one_cpu(struct device_node *dp, int cpuid, int arg)
{
        ncpus_probed++;
#ifdef CONFIG_SMP
        set_cpu_present(cpuid, true);
        set_cpu_possible(cpuid, true);
#endif
        return NULL;
}

void __init of_populate_present_mask(void)
{
        if (tlb_type == hypervisor)
                return;

        ncpus_probed = 0;
        of_iterate_over_cpus(record_one_cpu, 0);
}

static void *fill_in_one_cpu(struct device_node *dp, int cpuid, int arg)
{
        struct device_node *portid_parent = NULL;
        int portid = -1;

        if (of_find_property(dp, "cpuid", NULL)) {
                int limit = 2;

                portid_parent = dp;
                while (limit--) {
                        portid_parent = portid_parent->parent;
                        if (!portid_parent)
                                break;
                        portid = of_getintprop_default(portid_parent,
                                                       "portid", -1);
                        if (portid >= 0)
                                break;
                }
        }

#ifndef CONFIG_SMP
        /* On uniprocessor we only want the values for the
         * real physical cpu the kernel booted onto, however
         * cpu_data() only has one entry at index 0.
         */
        if (cpuid != real_hard_smp_processor_id())
                return NULL;
        cpuid = 0;
#endif

        cpu_data(cpuid).clock_tick =
                of_getintprop_default(dp, "clock-frequency", 0);

        if (portid_parent) {
                cpu_data(cpuid).dcache_size =
                        of_getintprop_default(dp, "l1-dcache-size",
                                              16 * 1024);
                cpu_data(cpuid).dcache_line_size =
                        of_getintprop_default(dp, "l1-dcache-line-size",
                                              32);
                cpu_data(cpuid).icache_size =
                        of_getintprop_default(dp, "l1-icache-size",
                                              8 * 1024);
                cpu_data(cpuid).icache_line_size =
                        of_getintprop_default(dp, "l1-icache-line-size",
                                              32);
                cpu_data(cpuid).ecache_size =
                        of_getintprop_default(dp, "l2-cache-size", 0);
                cpu_data(cpuid).ecache_line_size =
                        of_getintprop_default(dp, "l2-cache-line-size", 0);
                if (!cpu_data(cpuid).ecache_size ||
                    !cpu_data(cpuid).ecache_line_size) {
                        cpu_data(cpuid).ecache_size =
                                of_getintprop_default(portid_parent,
                                                      "l2-cache-size",
                                                      (4 * 1024 * 1024));
                        cpu_data(cpuid).ecache_line_size =
                                of_getintprop_default(portid_parent,
                                                      "l2-cache-line-size", 64);
                }

                cpu_data(cpuid).core_id = portid + 1;
                cpu_data(cpuid).proc_id = portid;
#ifdef CONFIG_SMP
                sparc64_multi_core = 1;
#endif
        } else {
                cpu_data(cpuid).dcache_size =
                        of_getintprop_default(dp, "dcache-size", 16 * 1024);
                cpu_data(cpuid).dcache_line_size =
                        of_getintprop_default(dp, "dcache-line-size", 32);

                cpu_data(cpuid).icache_size =
                        of_getintprop_default(dp, "icache-size", 16 * 1024);
                cpu_data(cpuid).icache_line_size =
                        of_getintprop_default(dp, "icache-line-size", 32);

                cpu_data(cpuid).ecache_size =
                        of_getintprop_default(dp, "ecache-size",
                                              (4 * 1024 * 1024));
                cpu_data(cpuid).ecache_line_size =
                        of_getintprop_default(dp, "ecache-line-size", 64);

                cpu_data(cpuid).core_id = 0;
                cpu_data(cpuid).proc_id = -1;
        }

        return NULL;
}

void __init of_fill_in_cpu_data(void)
{
        if (tlb_type == hypervisor)
                return;

        of_iterate_over_cpus(fill_in_one_cpu, 0);

        smp_fill_in_sib_core_maps();
}

void __init of_console_init(void)
{
        char *msg = "OF stdout device is: %s\n";
        struct device_node *dp;
        const char *type;
        phandle node;

        of_console_path = prom_early_alloc(256);
        if (prom_ihandle2path(prom_stdout, of_console_path, 256) < 0) {
                prom_printf("Cannot obtain path of stdout.\n");
                prom_halt();
        }
        of_console_options = strrchr(of_console_path, ':');
        if (of_console_options) {
                of_console_options++;
                if (*of_console_options == '\0')
                        of_console_options = NULL;
        }

        node = prom_inst2pkg(prom_stdout);
        if (!node) {
                prom_printf("Cannot resolve stdout node from "
                            "instance %08x.\n", prom_stdout);
                prom_halt();
        }

        dp = of_find_node_by_phandle(node);
        type = of_get_property(dp, "device_type", NULL);
        if (!type) {
                prom_printf("Console stdout lacks device_type property.\n");
                prom_halt();
        }

        if (strcmp(type, "display") && strcmp(type, "serial")) {
                prom_printf("Console device_type is neither display "
                            "nor serial.\n");
                prom_halt();
        }

        of_console_device = dp;

        printk(msg, of_console_path);
}