1 // SPDX-License-Identifier: GPL-2.0
3 * PROM interface routines.
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>
11 #include <linux/bootmem.h>
12 #include <linux/ioport.h>
13 #include <asm/bootinfo.h>
14 #include <asm/lasat/lasat.h>
18 #include <asm/lasat/eeprom.h>
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)
27 static void null_prom_display(const char *string, int pos, int clear)
31 static void null_prom_monitor(void)
35 static void null_prom_putc(char c)
39 /* these are functions provided by the bootloader */
40 static void (*__prom_putc)(char c) = null_prom_putc;
42 void prom_putchar(char c)
47 void (*prom_display)(const char *string, int pos, int clear) =
49 void (*prom_monitor)(void) = null_prom_monitor;
51 unsigned int lasat_ndelay_divider;
53 static void setup_prom_vectors(void)
55 u32 version = *(u32 *)(RESET_VECTOR + 0x90);
58 prom_display = (void *)PROM_DISPLAY_ADDR;
59 __prom_putc = (void *)PROM_PUTC_ADDR;
60 prom_monitor = (void *)PROM_MONITOR_ADDR;
62 printk(KERN_DEBUG "prom vectors set up\n");
65 static struct at93c_defs at93c_defs[N_MACHTYPES] = {
67 .reg = (void *)AT93C_REG_100,
68 .rdata_reg = (void *)AT93C_RDATA_REG_100,
69 .rdata_shift = AT93C_RDATA_SHIFT_100,
70 .wdata_shift = AT93C_WDATA_SHIFT_100,
72 .clk = AT93C_CLK_M_100
74 .reg = (void *)AT93C_REG_200,
75 .rdata_reg = (void *)AT93C_RDATA_REG_200,
76 .rdata_shift = AT93C_RDATA_SHIFT_200,
77 .wdata_shift = AT93C_WDATA_SHIFT_200,
79 .clk = AT93C_CLK_M_200
83 void __init prom_init(void)
86 char **argv = (char **) fw_arg1;
91 printk(KERN_INFO "LASAT 200 board\n");
92 lasat_ndelay_divider = LASAT_200_DIVIDER;
93 at93c = &at93c_defs[1];
95 printk(KERN_INFO "LASAT 100 board\n");
96 lasat_ndelay_divider = LASAT_100_DIVIDER;
97 at93c = &at93c_defs[0];
100 lasat_init_board_info(); /* Read info from EEPROM */
102 /* Get the command line */
104 strncpy(arcs_cmdline, argv[0], COMMAND_LINE_SIZE-1);
105 arcs_cmdline[COMMAND_LINE_SIZE-1] = '\0';
108 /* Set the I/O base address */
109 set_io_port_base(KSEG1);
111 /* Set memory regions */
112 ioport_resource.start = 0;
113 ioport_resource.end = 0xffffffff; /* Wrong, fixme. */
115 add_memory_region(0, lasat_board_info.li_memsize, BOOT_MEM_RAM);
118 void __init prom_free_prom_memory(void)
122 const char *get_system_type(void)
124 return lasat_board_info.li_bmstr;