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_display(const char *string, int pos, int clear)
  27 {
  28 }
  29
  30 static void null_prom_monitor(void)
  31 {
  32 }
  33
  34 static void null_prom_putc(char c)
  35 {
  36 }
  37
  38 /* these are functions provided by the bootloader */
  39 static void (*__prom_putc)(char c) = null_prom_putc;
  40
  41 void prom_putchar(char c)
  42 {
  43         __prom_putc(c);
  44 }
  45
  46 void (*prom_display)(const char *string, int pos, int clear) =
  47                 null_prom_display;
  48 void (*prom_monitor)(void) = null_prom_monitor;
  49
  50 unsigned int lasat_ndelay_divider;
  51
  52 static void setup_prom_vectors(void)
  53 {
  54         u32 version = *(u32 *)(RESET_VECTOR + 0x90);
  55
  56         if (version >= 307) {
  57                 prom_display = (void *)PROM_DISPLAY_ADDR;
  58                 __prom_putc = (void *)PROM_PUTC_ADDR;
  59                 prom_monitor = (void *)PROM_MONITOR_ADDR;
  60         }
  61         printk(KERN_DEBUG "prom vectors set up\n");
  62 }
  63
  64 static struct at93c_defs at93c_defs[N_MACHTYPES] = {
  65         {
  66                 .reg            = (void *)AT93C_REG_100,
  67                 .rdata_reg      = (void *)AT93C_RDATA_REG_100,
  68                 .rdata_shift    = AT93C_RDATA_SHIFT_100,
  69                 .wdata_shift    = AT93C_WDATA_SHIFT_100,
  70                 .cs             = AT93C_CS_M_100,
  71                 .clk            = AT93C_CLK_M_100
  72         }, {
  73                 .reg            = (void *)AT93C_REG_200,
  74                 .rdata_reg      = (void *)AT93C_RDATA_REG_200,
  75                 .rdata_shift    = AT93C_RDATA_SHIFT_200,
  76                 .wdata_shift    = AT93C_WDATA_SHIFT_200,
  77                 .cs             = AT93C_CS_M_200,
  78                 .clk            = AT93C_CLK_M_200
  79         },
  80 };
  81
  82 void __init prom_init(void)
  83 {
  84         int argc = fw_arg0;
  85         char **argv = (char **) fw_arg1;
  86
  87         setup_prom_vectors();
  88
  89         if (current_cpu_data.cputype == CPU_R5000) {
  90                 printk(KERN_INFO "LASAT 200 board\n");
  91                 mips_machtype = MACH_LASAT_200;
  92                 lasat_ndelay_divider = LASAT_200_DIVIDER;
  93         } else {
  94                 printk(KERN_INFO "LASAT 100 board\n");
  95                 mips_machtype = MACH_LASAT_100;
  96                 lasat_ndelay_divider = LASAT_100_DIVIDER;
  97         }
  98
  99         at93c = &at93c_defs[mips_machtype];
 100
 101         lasat_init_board_info();                /* Read info from EEPROM */
 102
 103         mips_machgroup = MACH_GROUP_LASAT;
 104
 105         /* Get the command line */
 106         if (argc > 0) {
 107                 strncpy(arcs_cmdline, argv[0], CL_SIZE-1);
 108                 arcs_cmdline[CL_SIZE-1] = '\0';
 109         }
 110
 111         /* Set the I/O base address */
 112         set_io_port_base(KSEG1);
 113
 114         /* Set memory regions */
 115         ioport_resource.start = 0;
 116         ioport_resource.end = 0xffffffff;       /* Wrong, fixme.  */
 117
 118         add_memory_region(0, lasat_board_info.li_memsize, BOOT_MEM_RAM);
 119 }
 120
 121 void __init prom_free_prom_memory(void)
 122 {
 123 }
 124
 125 const char *get_system_type(void)
 126 {
 127         return lasat_board_info.li_bmstr;
 128 }