prom.c

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/*
 * PROM interface routines.
 */
#include <linux/types.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/ioport.h>
#include <asm/bootinfo.h>
#include <asm/lasat/lasat.h>
#include <asm/cpu.h>

#include "at93c.h"
#include <asm/lasat/eeprom.h>
#include "prom.h"

#define RESET_VECTOR    0xbfc00000
#define PROM_JUMP_TABLE_ENTRY(n) (*((u32 *)(RESET_VECTOR + 0x20) + n))
#define PROM_DISPLAY_ADDR   PROM_JUMP_TABLE_ENTRY(0)
#define PROM_PUTC_ADDR      PROM_JUMP_TABLE_ENTRY(1)
#define PROM_MONITOR_ADDR   PROM_JUMP_TABLE_ENTRY(2)

static void null_prom_display(const char *string, int pos, int clear)
{
}

static void null_prom_monitor(void)
{
}

static void null_prom_putc(char c)
{
}

/* these are functions provided by the bootloader */
static void (*__prom_putc)(char c) = null_prom_putc;

void prom_putchar(char c)
{
    __prom_putc(c);
}

void (*prom_display)(const char *string, int pos, int clear) =
        null_prom_display;
void (*prom_monitor)(void) = null_prom_monitor;

unsigned int lasat_ndelay_divider;

static void setup_prom_vectors(void)
{
    u32 version = *(u32 *)(RESET_VECTOR + 0x90);

    if (version >= 307) {
        prom_display = (void *)PROM_DISPLAY_ADDR;
        __prom_putc = (void *)PROM_PUTC_ADDR;
        prom_monitor = (void *)PROM_MONITOR_ADDR;
    }
    printk(KERN_DEBUG "prom vectors set up\n");
}

static struct at93c_defs at93c_defs[N_MACHTYPES] = {
    {
        .reg        = (void *)AT93C_REG_100,
        .rdata_reg  = (void *)AT93C_RDATA_REG_100,
        .rdata_shift    = AT93C_RDATA_SHIFT_100,
        .wdata_shift    = AT93C_WDATA_SHIFT_100,
        .cs     = AT93C_CS_M_100,
        .clk        = AT93C_CLK_M_100
    }, {
        .reg        = (void *)AT93C_REG_200,
        .rdata_reg  = (void *)AT93C_RDATA_REG_200,
        .rdata_shift    = AT93C_RDATA_SHIFT_200,
        .wdata_shift    = AT93C_WDATA_SHIFT_200,
        .cs     = AT93C_CS_M_200,
        .clk        = AT93C_CLK_M_200
    },
};

void __init prom_init(void)
{
    int argc = fw_arg0;
    char **argv = (char **) fw_arg1;

    setup_prom_vectors();

    if (IS_LASAT_200()) {
        printk(KERN_INFO "LASAT 200 board\n");
        lasat_ndelay_divider = LASAT_200_DIVIDER;
        at93c = &at93c_defs[1];
    } else {
        printk(KERN_INFO "LASAT 100 board\n");
        lasat_ndelay_divider = LASAT_100_DIVIDER;
        at93c = &at93c_defs[0];
    }

    lasat_init_board_info();        /* Read info from EEPROM */

    /* Get the command line */
    if (argc > 0) {
        strncpy(arcs_cmdline, argv[0], COMMAND_LINE_SIZE-1);
        arcs_cmdline[COMMAND_LINE_SIZE-1] = '\0';
    }

    /* Set the I/O base address */
    set_io_port_base(KSEG1);

    /* Set memory regions */
    ioport_resource.start = 0;
    ioport_resource.end = 0xffffffff;   /* Wrong, fixme.  */

    add_memory_region(0, lasat_board_info.li_memsize, BOOT_MEM_RAM);
}

void __init prom_free_prom_memory(void)
{
}

const char *get_system_type(void)
{
    return lasat_board_info.li_bmstr;
}