1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ip22-setup.c: SGI specific setup, including init of the feature struct.
4 *
5 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
6 * Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org)
7 */
8#include <linux/init.h>
9#include <linux/kernel.h>
10#include <linux/kdev_t.h>
11#include <linux/types.h>
12#include <linux/console.h>
13#include <linux/sched.h>
14#include <linux/tty.h>
15
16#include <asm/addrspace.h>
17#include <asm/bcache.h>
18#include <asm/bootinfo.h>
19#include <asm/irq.h>
20#include <asm/reboot.h>
21#include <asm/time.h>
22#include <asm/io.h>
23#include <asm/traps.h>
24#include <asm/sgialib.h>
25#include <asm/sgi/mc.h>
26#include <asm/sgi/hpc3.h>
27#include <asm/sgi/ip22.h>
28
29extern void ip22_be_init(void) __init;
30
31void __init plat_mem_setup(void)
32{
33 char *ctype;
34 char *cserial;
35
36 board_be_init = ip22_be_init;
37
38 /* Init the INDY HPC I/O controller. Need to call this before
39 * fucking with the memory controller because it needs to know the
40 * boardID and whether this is a Guiness or a FullHouse machine.
41 */
42 sgihpc_init();
43
44 /* Init INDY memory controller. */
45 sgimc_init();
46
47#ifdef CONFIG_BOARD_SCACHE
48 /* Now enable boardcaches, if any. */
49 indy_sc_init();
50#endif
51
52 /* Set EISA IO port base for Indigo2
53 * ioremap cannot fail */
54 set_io_port_base((unsigned long)ioremap(offset: 0x00080000,
55 size: 0x1fffffff - 0x00080000));
56 /* ARCS console environment variable is set to "g?" for
57 * graphics console, it is set to "d" for the first serial
58 * line and "d2" for the second serial line.
59 *
60 * Need to check if the case is 'g' but no keyboard:
61 * (ConsoleIn/Out = serial)
62 */
63 ctype = ArcGetEnvironmentVariable("console");
64 cserial = ArcGetEnvironmentVariable("ConsoleOut");
65
66 if ((ctype && *ctype == 'd') || (cserial && *cserial == 's')) {
67 static char options[8] __initdata;
68 char *baud = ArcGetEnvironmentVariable("dbaud");
69 if (baud)
70 strcpy(p: options, q: baud);
71 add_preferred_console(name: "ttyS", idx: *(ctype + 1) == '2' ? 1 : 0,
72 options: baud ? options : NULL);
73 } else if (!ctype || *ctype != 'g') {
74 /* Use ARC if we don't want serial ('d') or graphics ('g'). */
75 prom_flags |= PROM_FLAG_USE_AS_CONSOLE;
76 add_preferred_console(name: "arc", idx: 0, NULL);
77 }
78}
79

source code of linux/arch/mips/sgi-ip22/ip22-setup.c