arch/mips/lasat/prom.c

   1 /*
   2  * PROM interface routines.
   3  */
   4 #include <linux/types.h>
   5 #include <linux/init.h>
   6 #include <linux/string.h>
   7 #include <linux/ctype.h>
   8 #include <linux/kernel.h>
   9 #include <linux/mm.h>
  10 #include <linux/bootmem.h>
  11 #include <linux/ioport.h>
  12 #include <asm/bootinfo.h>
  13 #include <asm/lasat/lasat.h>
  14 #include <asm/cpu.h>
  15
  16 #include "at93c.h"
  17 #include <asm/lasat/eeprom.h>
  18 #include "prom.h"
  19
  20 #define RESET_VECTOR    0xbfc00000
  21 #define PROM_JUMP_TABLE_ENTRY(n) (*((u32 *)(RESET_VECTOR + 0x20) + n))
  22 #define PROM_DISPLAY_ADDR       PROM_JUMP_TABLE_ENTRY(0)
  23 #define PROM_PUTC_ADDR          PROM_JUMP_TABLE_ENTRY(1)
  24 #define PROM_MONITOR_ADDR       PROM_JUMP_TABLE_ENTRY(2)
  25
  26 static void null_prom_printf(const char * fmt, ...)
  27 {
  28 }
  29
  30 static void null_prom_display(const char *string, int pos, int clear)
  31 {
  32 }
  33
  34 static void null_prom_monitor(void)
  35 {
  36 }
  37
  38 static void null_prom_putc(char c)
  39 {
  40 }
  41
  42 /* these are functions provided by the bootloader */
  43 static void (* prom_putc)(char c) = null_prom_putc;
  44 void (* prom_printf)(const char * fmt, ...) = null_prom_printf;
  45 void (* prom_display)(const char *string, int pos, int clear) =
  46                 null_prom_display;
  47 void (* prom_monitor)(void) = null_prom_monitor;
  48
  49 unsigned int lasat_ndelay_divider;
  50
  51 #define PROM_PRINTFBUF_SIZE 256
  52 static char prom_printfbuf[PROM_PRINTFBUF_SIZE];
  53
  54 static void real_prom_printf(const char * fmt, ...)
  55 {
  56         va_list ap;
  57         int len;
  58         char *c = prom_printfbuf;
  59         int i;
  60
  61         va_start(ap, fmt);
  62         len = vsnprintf(prom_printfbuf, PROM_PRINTFBUF_SIZE, fmt, ap);
  63         va_end(ap);
  64
  65         /* output overflowed the buffer */
  66         if (len < 0 || len > PROM_PRINTFBUF_SIZE)
  67                 len = PROM_PRINTFBUF_SIZE;
  68
  69         for (i=0; i < len; i++) {
  70                 if (*c == '\n')
  71                         prom_putc('\r');
  72                 prom_putc(*c++);
  73         }
  74 }
  75
  76 static void setup_prom_vectors(void)
  77 {
  78         u32 version = *(u32 *)(RESET_VECTOR + 0x90);
  79
  80         if (version >= 307) {
  81                 prom_display = (void *)PROM_DISPLAY_ADDR;
  82                 prom_putc = (void *)PROM_PUTC_ADDR;
  83                 prom_printf = real_prom_printf;
  84                 prom_monitor = (void *)PROM_MONITOR_ADDR;
  85         }
  86         prom_printf("prom vectors set up\n");
  87 }
  88
  89 static struct at93c_defs at93c_defs[N_MACHTYPES] = {
  90         {(void *)AT93C_REG_100, (void *)AT93C_RDATA_REG_100, AT93C_RDATA_SHIFT_100,
  91         AT93C_WDATA_SHIFT_100, AT93C_CS_M_100, AT93C_CLK_M_100},
  92         {(void *)AT93C_REG_200, (void *)AT93C_RDATA_REG_200, AT93C_RDATA_SHIFT_200,
  93         AT93C_WDATA_SHIFT_200, AT93C_CS_M_200, AT93C_CLK_M_200},
  94 };
  95
  96 void __init prom_init(void)
  97 {
  98         int argc = fw_arg0;
  99         char **argv = (char **) fw_arg1;
 100
 101         setup_prom_vectors();
 102
 103         if (current_cpu_data.cputype == CPU_R5000) {
 104                 prom_printf("LASAT 200 board\n");
 105                 mips_machtype = MACH_LASAT_200;
 106                 lasat_ndelay_divider = LASAT_200_DIVIDER;
 107         } else {
 108                 prom_printf("LASAT 100 board\n");
 109                 mips_machtype = MACH_LASAT_100;
 110                 lasat_ndelay_divider = LASAT_100_DIVIDER;
 111         }
 112
 113         at93c = &at93c_defs[mips_machtype];
 114
 115         lasat_init_board_info();                /* Read info from EEPROM */
 116
 117         mips_machgroup = MACH_GROUP_LASAT;
 118
 119         /* Get the command line */
 120         if (argc > 0) {
 121                 strncpy(arcs_cmdline, argv[0], CL_SIZE-1);
 122                 arcs_cmdline[CL_SIZE-1] = '\0';
 123         }
 124
 125         /* Set the I/O base address */
 126         set_io_port_base(KSEG1);
 127
 128         /* Set memory regions */
 129         ioport_resource.start = 0;
 130         ioport_resource.end = 0xffffffff;       /* Wrong, fixme.  */
 131
 132         add_memory_region(0, lasat_board_info.li_memsize, BOOT_MEM_RAM);
 133 }
 134
 135 unsigned long __init prom_free_prom_memory(void)
 136 {
 137         return 0;
 138 }
 139
 140 const char *get_system_type(void)
 141 {
 142         return lasat_board_info.li_bmstr;
 143 }