arch/mips/lasat/prom.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * PROM interface routines.
   4  */
   5 #include <linux/types.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/memblock.h>
  12 #include <linux/ioport.h>
  13 #include <asm/bootinfo.h>
  14 #include <asm/lasat/lasat.h>
  15 #include <asm/cpu.h>
  16 #include <asm/setup.h>
  17
  18 #include "at93c.h"
  19 #include <asm/lasat/eeprom.h>
  20 #include "prom.h"
  21
  22 #define RESET_VECTOR    0xbfc00000
  23 #define PROM_JUMP_TABLE_ENTRY(n) (*((u32 *)(RESET_VECTOR + 0x20) + n))
  24 #define PROM_DISPLAY_ADDR       PROM_JUMP_TABLE_ENTRY(0)
  25 #define PROM_PUTC_ADDR          PROM_JUMP_TABLE_ENTRY(1)
  26 #define PROM_MONITOR_ADDR       PROM_JUMP_TABLE_ENTRY(2)
  27
  28 static void null_prom_display(const char *string, int pos, int clear)
  29 {
  30 }
  31
  32 static void null_prom_monitor(void)
  33 {
  34 }
  35
  36 static void null_prom_putc(char c)
  37 {
  38 }
  39
  40 /* these are functions provided by the bootloader */
  41 static void (*__prom_putc)(char c) = null_prom_putc;
  42
  43 void prom_putchar(char c)
  44 {
  45         __prom_putc(c);
  46 }
  47
  48 void (*prom_display)(const char *string, int pos, int clear) =
  49                 null_prom_display;
  50 void (*prom_monitor)(void) = null_prom_monitor;
  51
  52 unsigned int lasat_ndelay_divider;
  53
  54 static void setup_prom_vectors(void)
  55 {
  56         u32 version = *(u32 *)(RESET_VECTOR + 0x90);
  57
  58         if (version >= 307) {
  59                 prom_display = (void *)PROM_DISPLAY_ADDR;
  60                 __prom_putc = (void *)PROM_PUTC_ADDR;
  61                 prom_monitor = (void *)PROM_MONITOR_ADDR;
  62         }
  63         printk(KERN_DEBUG "prom vectors set up\n");
  64 }
  65
  66 static struct at93c_defs at93c_defs[N_MACHTYPES] = {
  67         {
  68                 .reg            = (void *)AT93C_REG_100,
  69                 .rdata_reg      = (void *)AT93C_RDATA_REG_100,
  70                 .rdata_shift    = AT93C_RDATA_SHIFT_100,
  71                 .wdata_shift    = AT93C_WDATA_SHIFT_100,
  72                 .cs             = AT93C_CS_M_100,
  73                 .clk            = AT93C_CLK_M_100
  74         }, {
  75                 .reg            = (void *)AT93C_REG_200,
  76                 .rdata_reg      = (void *)AT93C_RDATA_REG_200,
  77                 .rdata_shift    = AT93C_RDATA_SHIFT_200,
  78                 .wdata_shift    = AT93C_WDATA_SHIFT_200,
  79                 .cs             = AT93C_CS_M_200,
  80                 .clk            = AT93C_CLK_M_200
  81         },
  82 };
  83
  84 void __init prom_init(void)
  85 {
  86         int argc = fw_arg0;
  87         char **argv = (char **) fw_arg1;
  88
  89         setup_prom_vectors();
  90
  91         if (IS_LASAT_200()) {
  92                 printk(KERN_INFO "LASAT 200 board\n");
  93                 lasat_ndelay_divider = LASAT_200_DIVIDER;
  94                 at93c = &at93c_defs[1];
  95         } else {
  96                 printk(KERN_INFO "LASAT 100 board\n");
  97                 lasat_ndelay_divider = LASAT_100_DIVIDER;
  98                 at93c = &at93c_defs[0];
  99         }
 100
 101         lasat_init_board_info();                /* Read info from EEPROM */
 102
 103         /* Get the command line */
 104         if (argc > 0) {
 105                 strncpy(arcs_cmdline, argv[0], COMMAND_LINE_SIZE-1);
 106                 arcs_cmdline[COMMAND_LINE_SIZE-1] = '\0';
 107         }
 108
 109         /* Set the I/O base address */
 110         set_io_port_base(KSEG1);
 111
 112         /* Set memory regions */
 113         ioport_resource.start = 0;
 114         ioport_resource.end = 0xffffffff;       /* Wrong, fixme.  */
 115
 116         add_memory_region(0, lasat_board_info.li_memsize, BOOT_MEM_RAM);
 117 }
 118
 119 void __init prom_free_prom_memory(void)
 120 {
 121 }
 122
 123 const char *get_system_type(void)
 124 {
 125         return lasat_board_info.li_bmstr;
 126 }