1/*
2 * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
17 */
18#include <linux/init.h>
19#include <linux/module.h>
20#include <linux/kernel.h>
21#include <linux/reboot.h>
22#include <linux/string.h>
23
24#include <asm/bootinfo.h>
25#include <asm/mipsregs.h>
26#include <asm/io.h>
27#include <asm/sibyte/sb1250.h>
28#include <asm/sibyte/sb1250_regs.h>
29#include <asm/sibyte/sb1250_scd.h>
30
31unsigned int sb1_pass;
32unsigned int soc_pass;
33unsigned int soc_type;
34unsigned int periph_rev;
35unsigned int zbbus_mhz;
36EXPORT_SYMBOL(zbbus_mhz);
37
38static char *soc_str;
39static char *pass_str;
40static unsigned int war_pass;	/* XXXKW don't overload PASS defines? */
41
42static inline int setup_bcm1250(void);
43static inline int setup_bcm112x(void);
44
45/* Setup code likely to be common to all SiByte platforms */
46
47static int __init sys_rev_decode(void)
48{
49	int ret = 0;
50
51	war_pass = soc_pass;
52	switch (soc_type) {
53	case K_SYS_SOC_TYPE_BCM1250:
54	case K_SYS_SOC_TYPE_BCM1250_ALT:
55	case K_SYS_SOC_TYPE_BCM1250_ALT2:
56		soc_str = "BCM1250";
57		ret = setup_bcm1250();
58		break;
59	case K_SYS_SOC_TYPE_BCM1120:
60		soc_str = "BCM1120";
61		ret = setup_bcm112x();
62		break;
63	case K_SYS_SOC_TYPE_BCM1125:
64		soc_str = "BCM1125";
65		ret = setup_bcm112x();
66		break;
67	case K_SYS_SOC_TYPE_BCM1125H:
68		soc_str = "BCM1125H";
69		ret = setup_bcm112x();
70		break;
71	default:
72		printk("Unknown SOC type %x\n", soc_type);
73		ret = 1;
74		break;
75	}
76	return ret;
77}
78
79static int __init setup_bcm1250(void)
80{
81	int ret = 0;
82
83	switch (soc_pass) {
84	case K_SYS_REVISION_BCM1250_PASS1:
85		periph_rev = 1;
86		pass_str = "Pass 1";
87		break;
88	case K_SYS_REVISION_BCM1250_A10:
89		periph_rev = 2;
90		pass_str = "A8/A10";
91		/* XXXKW different war_pass? */
92		war_pass = K_SYS_REVISION_BCM1250_PASS2;
93		break;
94	case K_SYS_REVISION_BCM1250_PASS2_2:
95		periph_rev = 2;
96		pass_str = "B1";
97		break;
98	case K_SYS_REVISION_BCM1250_B2:
99		periph_rev = 2;
100		pass_str = "B2";
101		war_pass = K_SYS_REVISION_BCM1250_PASS2_2;
102		break;
103	case K_SYS_REVISION_BCM1250_PASS3:
104		periph_rev = 3;
105		pass_str = "C0";
106		break;
107	case K_SYS_REVISION_BCM1250_C1:
108		periph_rev = 3;
109		pass_str = "C1";
110		break;
111	default:
112		if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) {
113			periph_rev = 2;
114			pass_str = "A0-A6";
115			war_pass = K_SYS_REVISION_BCM1250_PASS2;
116		} else {
117			printk("Unknown BCM1250 rev %x\n", soc_pass);
118			ret = 1;
119		}
120		break;
121	}
122	return ret;
123}
124
125static int __init setup_bcm112x(void)
126{
127	int ret = 0;
128
129	switch (soc_pass) {
130	case 0:
131		/* Early build didn't have revid set */
132		periph_rev = 3;
133		pass_str = "A1";
134		war_pass = K_SYS_REVISION_BCM112x_A1;
135		break;
136	case K_SYS_REVISION_BCM112x_A1:
137		periph_rev = 3;
138		pass_str = "A1";
139		break;
140	case K_SYS_REVISION_BCM112x_A2:
141		periph_rev = 3;
142		pass_str = "A2";
143		break;
144	case K_SYS_REVISION_BCM112x_A3:
145		periph_rev = 3;
146		pass_str = "A3";
147		break;
148	case K_SYS_REVISION_BCM112x_A4:
149		periph_rev = 3;
150		pass_str = "A4";
151		break;
152	case K_SYS_REVISION_BCM112x_B0:
153		periph_rev = 3;
154		pass_str = "B0";
155		break;
156	default:
157		printk("Unknown %s rev %x\n", soc_str, soc_pass);
158		ret = 1;
159	}
160	return ret;
161}
162
163void __init sb1250_setup(void)
164{
165	uint64_t sys_rev;
166	int plldiv;
167	int bad_config = 0;
168
169	sb1_pass = read_c0_prid() & 0xff;
170	sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
171	soc_type = SYS_SOC_TYPE(sys_rev);
172	soc_pass = G_SYS_REVISION(sys_rev);
173
174	if (sys_rev_decode()) {
175		printk("Restart after failure to identify SiByte chip\n");
176		machine_restart(NULL);
177	}
178
179	plldiv = G_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
180	zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
181
182	printk("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n",
183		    soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
184	printk("Board type: %s\n", get_system_type());
185
186	switch (war_pass) {
187	case K_SYS_REVISION_BCM1250_PASS1:
188#ifndef CONFIG_SB1_PASS_1_WORKAROUNDS
189		printk("@@@@ This is a BCM1250 A0-A2 (Pass 1) board, "
190		            "and the kernel doesn't have the proper "
191		            "workarounds compiled in. @@@@\n");
192		bad_config = 1;
193#endif
194		break;
195	case K_SYS_REVISION_BCM1250_PASS2:
196		/* Pass 2 - easiest as default for now - so many numbers */
197#if !defined(CONFIG_SB1_PASS_2_WORKAROUNDS) || \
198	!defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS)
199		printk("@@@@ This is a BCM1250 A3-A10 board, and the "
200		            "kernel doesn't have the proper workarounds "
201		            "compiled in. @@@@\n");
202		bad_config = 1;
203#endif
204#ifdef CONFIG_CPU_HAS_PREFETCH
205		printk("@@@@ Prefetches may be enabled in this kernel, "
206		            "but are buggy on this board.  @@@@\n");
207		bad_config = 1;
208#endif
209		break;
210	case K_SYS_REVISION_BCM1250_PASS2_2:
211#ifndef CONFIG_SB1_PASS_2_WORKAROUNDS
212		printk("@@@@ This is a BCM1250 B1/B2. board, and the "
213		            "kernel doesn't have the proper workarounds "
214		            "compiled in. @@@@\n");
215		bad_config = 1;
216#endif
217#if defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) || !defined(CONFIG_CPU_HAS_PREFETCH)
218		printk("@@@@ This is a BCM1250 B1/B2, but the kernel is "
219		            "conservatively configured for an 'A' stepping. "
220		            "@@@@\n");
221#endif
222		break;
223	default:
224		break;
225	}
226	if (bad_config) {
227		printk("Invalid configuration for this chip.\n");
228		machine_restart(NULL);
229	}
230}
231