xref: /kernel/linux/linux-5.10/arch/mips/fw/sni/sniprom.c (revision 8c2ecf20) 
1/*
2 * Big Endian PROM code for SNI RM machines
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License.  See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 2005-2006 Florian Lohoff (flo@rfc822.org)
9 * Copyright (C) 2005-2006 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
10 */
11
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/memblock.h>
15#include <linux/string.h>
16#include <linux/console.h>
17
18#include <asm/addrspace.h>
19#include <asm/sni.h>
20#include <asm/mipsprom.h>
21#include <asm/mipsregs.h>
22#include <asm/bootinfo.h>
23#include <asm/setup.h>
24
25/* special SNI prom calls */
26/*
27 * This does not exist in all proms - SINIX compares
28 * the prom env variable "version" against "2.0008"
29 * or greater. If lesser it tries to probe interesting
30 * registers
31 */
32#define PROM_GET_MEMCONF	58
33#define PROM_GET_HWCONF		61
34
35#define PROM_VEC		(u64 *)CKSEG1ADDR(0x1fc00000)
36#define PROM_ENTRY(x)		(PROM_VEC + (x))
37
38#define ___prom_putchar		((int *(*)(int))PROM_ENTRY(PROM_PUTCHAR))
39#define ___prom_getenv		((char *(*)(char *))PROM_ENTRY(PROM_GETENV))
40#define ___prom_get_memconf	((void (*)(void *))PROM_ENTRY(PROM_GET_MEMCONF))
41#define ___prom_get_hwconf	((u32 (*)(void))PROM_ENTRY(PROM_GET_HWCONF))
42
43#ifdef CONFIG_64BIT
44
45/* O32 stack has to be 8-byte aligned. */
46static u64 o32_stk[4096];
47#define O32_STK	  (&o32_stk[ARRAY_SIZE(o32_stk)])
48
49#define __PROM_O32(fun, arg) fun arg __asm__(#fun); \
50				     __asm__(#fun " = call_o32")
51
52int   __PROM_O32(__prom_putchar, (int *(*)(int), void *, int));
53char *__PROM_O32(__prom_getenv, (char *(*)(char *), void *, char *));
54void  __PROM_O32(__prom_get_memconf, (void (*)(void *), void *, void *));
55u32   __PROM_O32(__prom_get_hwconf, (u32 (*)(void), void *));
56
57#define _prom_putchar(x)     __prom_putchar(___prom_putchar, O32_STK, x)
58#define _prom_getenv(x)	     __prom_getenv(___prom_getenv, O32_STK, x)
59#define _prom_get_memconf(x) __prom_get_memconf(___prom_get_memconf, O32_STK, x)
60#define _prom_get_hwconf()   __prom_get_hwconf(___prom_get_hwconf, O32_STK)
61
62#else
63#define _prom_putchar(x)     ___prom_putchar(x)
64#define _prom_getenv(x)	     ___prom_getenv(x)
65#define _prom_get_memconf(x) ___prom_get_memconf(x)
66#define _prom_get_hwconf(x)  ___prom_get_hwconf(x)
67#endif
68
69void prom_putchar(char c)
70{
71	_prom_putchar(c);
72}
73
74
75char *prom_getenv(char *s)
76{
77	return _prom_getenv(s);
78}
79
80void *prom_get_hwconf(void)
81{
82	u32 hwconf = _prom_get_hwconf();
83
84	if (hwconf == 0xffffffff)
85		return NULL;
86
87	return (void *)CKSEG1ADDR(hwconf);
88}
89
90void __init prom_free_prom_memory(void)
91{
92}
93
94/*
95 * /proc/cpuinfo system type
96 *
97 */
98char *system_type = "Unknown";
99const char *get_system_type(void)
100{
101	return system_type;
102}
103
104static void __init sni_mem_init(void)
105{
106	int i, memsize;
107	struct membank {
108		u32		size;
109		u32		base;
110		u32		size2;
111		u32		pad1;
112		u32		pad2;
113	} memconf[8];
114	int brd_type = *(unsigned char *)SNI_IDPROM_BRDTYPE;
115
116
117	/* MemSIZE from prom in 16MByte chunks */
118	memsize = *((unsigned char *) SNI_IDPROM_MEMSIZE) * 16;
119
120	pr_debug("IDProm memsize: %u MByte\n", memsize);
121
122	/* get memory bank layout from prom */
123	_prom_get_memconf(&memconf);
124
125	pr_debug("prom_get_mem_conf memory configuration:\n");
126	for (i = 0; i < 8 && memconf[i].size; i++) {
127		if (brd_type == SNI_BRD_PCI_TOWER ||
128		    brd_type == SNI_BRD_PCI_TOWER_CPLUS) {
129			if (memconf[i].base >= 0x20000000 &&
130			    memconf[i].base <  0x30000000)
131				memconf[i].base -= 0x20000000;
132		}
133		pr_debug("Bank%d: %08x @ %08x\n", i,
134			memconf[i].size, memconf[i].base);
135		memblock_add(memconf[i].base, memconf[i].size);
136	}
137}
138
139void __init prom_init(void)
140{
141	int argc = fw_arg0;
142	u32 *argv = (u32 *)CKSEG0ADDR(fw_arg1);
143	int i;
144
145	sni_mem_init();
146
147	/* copy prom cmdline parameters to kernel cmdline */
148	for (i = 1; i < argc; i++) {
149		strcat(arcs_cmdline, (char *)CKSEG0ADDR(argv[i]));
150		if (i < (argc - 1))
151			strcat(arcs_cmdline, " ");
152	}
153}
154