Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * Copyright (C) Paul Mackerras 1997.

 *

 * 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 <stddef.h>

#include "types.h"

#include "elf.h"

#include "string.h"

#include "stdio.h"

#include "page.h"

#include "ops.h"

#include "of.h"

static int (*prom) (void *);

void of_init(void *promptr)

{

        prom = (int (*)(void *))promptr;

}

int of_call_prom(const char *service, int nargs, int nret, ...)

{

        int i;

        struct prom_args {

                const char *service;

                int nargs;

                int nret;

                unsigned int args[12];

        } args;

        va_list list;

        args.service = service;

        args.nargs = nargs;

        args.nret = nret;

        va_start(list, nret);

        for (i = 0; i < nargs; i++)

                args.args[i] = va_arg(list, unsigned int);

        va_end(list);

        for (i = 0; i < nret; i++)

                args.args[nargs+i] = 0;

        if (prom(&args) < 0)

                return -1;

        return (nret > 0)? args.args[nargs]: 0;

}

static int of_call_prom_ret(const char *service, int nargs, int nret,

                            unsigned int *rets, ...)

{

        int i;

        struct prom_args {

                const char *service;

                int nargs;

                int nret;

                unsigned int args[12];

        } args;

        va_list list;

        args.service = service;

        args.nargs = nargs;

        args.nret = nret;

        va_start(list, rets);

        for (i = 0; i < nargs; i++)

                args.args[i] = va_arg(list, unsigned int);

        va_end(list);

        for (i = 0; i < nret; i++)

                args.args[nargs+i] = 0;

        if (prom(&args) < 0)

                return -1;

        if (rets != (void *) 0)

                for (i = 1; i < nret; ++i)

                        rets[i-1] = args.args[nargs+i];

        return (nret > 0)? args.args[nargs]: 0;

}

/* returns true if s2 is a prefix of s1 */

static int string_match(const char *s1, const char *s2)

{

        for (; *s2; ++s2)

                if (*s1++ != *s2)

                        return 0;

        return 1;

}

/*

 * Older OF's require that when claiming a specific range of addresses,

 * we claim the physical space in the /memory node and the virtual

 * space in the chosen mmu node, and then do a map operation to

 * map virtual to physical.

 */

static int need_map = -1;

static ihandle chosen_mmu;

static phandle memory;

static int check_of_version(void)

{

        phandle oprom, chosen;

        char version[64];

        oprom = of_finddevice("/openprom");

        if (oprom == (phandle) -1)

                return 0;

        if (of_getprop(oprom, "model", version, sizeof(version)) <= 0)

                return 0;

        version[sizeof(version)-1] = 0;

        printf("OF version = '%s'\r\n", version);

        if (!string_match(version, "Open Firmware, 1.")

            && !string_match(version, "FirmWorks,3."))

                return 0;

        chosen = of_finddevice("/chosen");

        if (chosen == (phandle) -1) {

                chosen = of_finddevice("/chosen@0");

                if (chosen == (phandle) -1) {

                        printf("no chosen\n");

                        return 0;

                }

        }

        if (of_getprop(chosen, "mmu", &chosen_mmu, sizeof(chosen_mmu)) <= 0) {

                printf("no mmu\n");

                return 0;

        }

        memory = (ihandle) of_call_prom("open", 1, 1, "/memory");

        if (memory == (ihandle) -1) {

                memory = (ihandle) of_call_prom("open", 1, 1, "/memory@0");

                if (memory == (ihandle) -1) {

                        printf("no memory node\n");

                        return 0;

                }

        }

        printf("old OF detected\r\n");

        return 1;

}

void *of_claim(unsigned long virt, unsigned long size, unsigned long align)

{

        int ret;

        unsigned int result;

        if (need_map < 0)

                need_map = check_of_version();

        if (align || !need_map)

                return (void *) of_call_prom("claim", 3, 1, virt, size, align);

        ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", memory,

                               align, size, virt);

        if (ret != 0 || result == -1)

                return (void *) -1;

        ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", chosen_mmu,

                               align, size, virt);

        /* 0x12 == coherent + read/write */

        ret = of_call_prom("call-method", 6, 1, "map", chosen_mmu,

                           0x12, size, virt, virt);

        return (void *) virt;

}

void *of_vmlinux_alloc(unsigned long size)

{

        void *p = malloc(size);

        if (!p)

                fatal("Can't allocate memory for kernel image!\n\r");

        return p;

}

void of_exit(void)

{

        of_call_prom("exit", 0, 0);

}

/*

 * OF device tree routines

 */

void *of_finddevice(const char *name)

{

        return (phandle) of_call_prom("finddevice", 1, 1, name);

}

int of_getprop(const void *phandle, const char *name, void *buf,

               const int buflen)

{

        return of_call_prom("getprop", 4, 1, phandle, name, buf, buflen);

}

int of_setprop(const void *phandle, const char *name, const void *buf,

               const int buflen)

{

        return of_call_prom("setprop", 4, 1, phandle, name, buf, buflen);

}