arch/mips/lasat/prom.c

   1 /*
   2  * PROM interface routines.
   3  */
   4 #include <linux/types.h>
   5 #include <linux/config.h>
   6 #include <linux/init.h>
   7 #include <linux/string.h>
   8 #include <linux/ctype.h>
   9 #include <linux/kernel.h>
  10 #include <linux/mm.h>
  11 #include <linux/bootmem.h>
  12 #include <linux/ioport.h>
  13 #include <asm/bootinfo.h>
  14 #include <asm/lasat/lasat.h>
  15 #include <asm/cpu.h>
  16
  17 #include "at93c.h"
  18 #include <asm/lasat/eeprom.h>
  19 #include "prom.h"
  20
  21 #define RESET_VECTOR    0xbfc00000
  22 #define PROM_JUMP_TABLE_ENTRY(n) (*((u32 *)(RESET_VECTOR + 0x20) + n))
  23 #define PROM_DISPLAY_ADDR       PROM_JUMP_TABLE_ENTRY(0)
  24 #define PROM_PUTC_ADDR          PROM_JUMP_TABLE_ENTRY(1)
  25 #define PROM_MONITOR_ADDR       PROM_JUMP_TABLE_ENTRY(2)
  26
  27 static void null_prom_printf(const char * fmt, ...)
  28 {
  29 }
  30
  31 static void null_prom_display(const char *string, int pos, int clear)
  32 {
  33 }
  34
  35 static void null_prom_monitor(void)
  36 {
  37 }
  38
  39 static void null_prom_putc(char c)
  40 {
  41 }
  42
  43 /* these are functions provided by the bootloader */
  44 static void (* prom_putc)(char c) = null_prom_putc;
  45 void (* prom_printf)(const char * fmt, ...) = null_prom_printf;
  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 #define PROM_PRINTFBUF_SIZE 256
  51 static char prom_printfbuf[PROM_PRINTFBUF_SIZE];
  52
  53 static void real_prom_printf(const char * fmt, ...)
  54 {
  55         va_list ap;
  56         int len;
  57         char *c = prom_printfbuf;
  58         int i;
  59
  60         va_start(ap, fmt);
  61         len = vsnprintf(prom_printfbuf, PROM_PRINTFBUF_SIZE, fmt, ap);
  62         va_end(ap);
  63
  64         /* output overflowed the buffer */
  65         if (len < 0 || len > PROM_PRINTFBUF_SIZE)
  66                 len = PROM_PRINTFBUF_SIZE;
  67
  68         for (i=0; i < len; i++) {
  69                 if (*c == '\n')
  70                         prom_putc('\r');
  71                 prom_putc(*c++);
  72         }
  73 }
  74
  75 static void setup_prom_vectors(void)
  76 {
  77         u32 version = *(u32 *)(RESET_VECTOR + 0x90);
  78
  79         if (version == 306) {
  80                 prom_display = (void *)PROM_DISPLAY_ADDR;
  81                 prom_putc = (void *)PROM_PUTC_ADDR;
  82                 prom_printf = real_prom_printf;
  83                 prom_monitor = (void *)PROM_MONITOR_ADDR;
  84         }
  85         prom_printf("prom vectors set up\n");
  86 }
  87
  88 char arcs_cmdline[CL_SIZE];
  89
  90 static struct at93c_defs at93c_defs[N_MACHTYPES] = {
  91         {(void *)AT93C_REG_100, (void *)AT93C_RDATA_REG_100, AT93C_RDATA_SHIFT_100,
  92         AT93C_WDATA_SHIFT_100, AT93C_CS_M_100, AT93C_CLK_M_100},
  93         {(void *)AT93C_REG_200, (void *)AT93C_RDATA_REG_200, AT93C_RDATA_SHIFT_200,
  94         AT93C_WDATA_SHIFT_200, AT93C_CS_M_200, AT93C_CLK_M_200},
  95 };
  96
  97 void __init prom_init(int argc, char **argv, char **envp, int *prom_vec)
  98 {
  99         setup_prom_vectors();
 100
 101         if (current_cpu_data.cputype == CPU_R5000)
 102                 mips_machtype = MACH_LASAT_200;
 103         else
 104                 mips_machtype = MACH_LASAT_100;
 105
 106         at93c = &at93c_defs[mips_machtype];
 107
 108         lasat_init_board_info();                /* Read info from EEPROM */
 109
 110         mips_machgroup = MACH_GROUP_LASAT;
 111
 112         /* Get the command line */
 113         if (argc>0) {
 114                 strncpy(arcs_cmdline, argv[0], CL_SIZE-1);
 115                 arcs_cmdline[CL_SIZE-1] = '\0';
 116         }
 117
 118         /* Set the I/O base address */
 119         set_io_port_base(KSEG1);
 120
 121         /* Set memory regions */
 122         ioport_resource.start = 0;              /* Should be KSEGx ???  */
 123         ioport_resource.end = 0xffffffff;       /* Should be ???        */
 124
 125         add_memory_region(0, lasat_board_info.li_memsize, BOOT_MEM_RAM);
 126 }
 127
 128 void prom_free_prom_memory(void)
 129 {
 130 }
 131
 132 const char *get_system_type(void)
 133 {
 134         return lasat_board_info.li_bmstr;
 135 }