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/bootmem.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
null_prom_display(const char * string,int pos,int clear)28 static void null_prom_display(const char *string, int pos, int clear)
29 {
30 }
31
null_prom_monitor(void)32 static void null_prom_monitor(void)
33 {
34 }
35
null_prom_putc(char c)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
prom_putchar(char c)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
setup_prom_vectors(void)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
prom_init(void)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
prom_free_prom_memory(void)119 void __init prom_free_prom_memory(void)
120 {
121 }
122
get_system_type(void)123 const char *get_system_type(void)
124 {
125 return lasat_board_info.li_bmstr;
126 }
127
