prom.c

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/*
 *
 * Per Hallsmark, [email protected]
 *
 * Based on jmr3927/common/prom.c
 *
 * 2004 (c) MontaVista Software, Inc. This file is licensed under the
 * terms of the GNU General Public License version 2. This program is
 * licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/serial_pnx8xxx.h>

#include <asm/bootinfo.h>
#include <uart.h>

/* #define DEBUG_CMDLINE */

extern int prom_argc;
extern char **prom_argv, **prom_envp;

typedef struct
{
    char *name;
/*    char *val; */
}t_env_var;


char * __init prom_getcmdline(void)
{
    return &(arcs_cmdline[0]);
}

void __init prom_init_cmdline(void)
{
    int i;

    arcs_cmdline[0] = '\0';
    for (i = 0; i < prom_argc; i++) {
        strcat(arcs_cmdline, prom_argv[i]);
        strcat(arcs_cmdline, " ");
    }
}

char *prom_getenv(char *envname)
{
    /*
     * Return a pointer to the given environment variable.
     * Environment variables are stored in the form of "memsize=64".
     */

    t_env_var *env = (t_env_var *)prom_envp;
    int i;

    i = strlen(envname);

    while(env->name) {
        if(strncmp(envname, env->name, i) == 0) {
            return(env->name + strlen(envname) + 1);
        }
        env++;
    }
    return(NULL);
}

inline unsigned char str2hexnum(unsigned char c)
{
    if(c >= '0' && c <= '9')
        return c - '0';
    if(c >= 'a' && c <= 'f')
        return c - 'a' + 10;
    if(c >= 'A' && c <= 'F')
        return c - 'A' + 10;
    return 0; /* foo */
}

inline void str2eaddr(unsigned char *ea, unsigned char *str)
{
    int i;

    for(i = 0; i < 6; i++) {
        unsigned char num;

        if((*str == '.') || (*str == ':'))
            str++;
        num = str2hexnum(*str++) << 4;
        num |= (str2hexnum(*str++));
        ea[i] = num;
    }
}

int get_ethernet_addr(char *ethernet_addr)
{
        char *ethaddr_str;

        ethaddr_str = prom_getenv("ethaddr");
    if (!ethaddr_str) {
            printk("ethaddr not set in boot prom\n");
        return -1;
    }
    str2eaddr(ethernet_addr, ethaddr_str);
    return 0;
}

void __init prom_free_prom_memory(void)
{
}

extern int pnx8550_console_port;

/* used by early printk */
void prom_putchar(char c)
{
    if (pnx8550_console_port != -1) {
        /* Wait until FIFO not full */
        while( ((ip3106_fifo(UART_BASE, pnx8550_console_port) & PNX8XXX_UART_FIFO_TXFIFO) >> 16) >= 16)
            ;
        /* Send one char */
        ip3106_fifo(UART_BASE, pnx8550_console_port) = c;
    }
}

EXPORT_SYMBOL(get_ethernet_addr);
EXPORT_SYMBOL(str2eaddr);