xref: /linux/arch/sh/kernel/cpu/sh4/probe.c (revision ed3174d93c342b8b2eeba6bbd124707d55304a7b)
1 /*
2  * arch/sh/kernel/cpu/sh4/probe.c
3  *
4  * CPU Subtype Probing for SH-4.
5  *
6  * Copyright (C) 2001 - 2007  Paul Mundt
7  * Copyright (C) 2003  Richard Curnow
8  *
9  * This file is subject to the terms and conditions of the GNU General Public
10  * License.  See the file "COPYING" in the main directory of this archive
11  * for more details.
12  */
13 #include <linux/init.h>
14 #include <linux/io.h>
15 #include <asm/processor.h>
16 #include <asm/cache.h>
17 
18 int __init detect_cpu_and_cache_system(void)
19 {
20 	unsigned long pvr, prr, cvr;
21 	unsigned long size;
22 
23 	static unsigned long sizes[16] = {
24 		[1] = (1 << 12),
25 		[2] = (1 << 13),
26 		[4] = (1 << 14),
27 		[8] = (1 << 15),
28 		[9] = (1 << 16)
29 	};
30 
31 	pvr = (ctrl_inl(CCN_PVR) >> 8) & 0xffffff;
32 	prr = (ctrl_inl(CCN_PRR) >> 4) & 0xff;
33 	cvr = (ctrl_inl(CCN_CVR));
34 
35 	/*
36 	 * Setup some sane SH-4 defaults for the icache
37 	 */
38 	boot_cpu_data.icache.way_incr		= (1 << 13);
39 	boot_cpu_data.icache.entry_shift	= 5;
40 	boot_cpu_data.icache.sets		= 256;
41 	boot_cpu_data.icache.ways		= 1;
42 	boot_cpu_data.icache.linesz		= L1_CACHE_BYTES;
43 
44 	/*
45 	 * And again for the dcache ..
46 	 */
47 	boot_cpu_data.dcache.way_incr		= (1 << 14);
48 	boot_cpu_data.dcache.entry_shift	= 5;
49 	boot_cpu_data.dcache.sets		= 512;
50 	boot_cpu_data.dcache.ways		= 1;
51 	boot_cpu_data.dcache.linesz		= L1_CACHE_BYTES;
52 
53 	/*
54 	 * Setup some generic flags we can probe on SH-4A parts
55 	 */
56 	if (((pvr >> 16) & 0xff) == 0x10) {
57 		if ((cvr & 0x10000000) == 0)
58 			boot_cpu_data.flags |= CPU_HAS_DSP;
59 
60 		boot_cpu_data.flags |= CPU_HAS_LLSC;
61 	}
62 
63 	/* FPU detection works for everyone */
64 	if ((cvr & 0x20000000) == 1)
65 		boot_cpu_data.flags |= CPU_HAS_FPU;
66 
67 	/* Mask off the upper chip ID */
68 	pvr &= 0xffff;
69 
70 	/*
71 	 * Probe the underlying processor version/revision and
72 	 * adjust cpu_data setup accordingly.
73 	 */
74 	switch (pvr) {
75 	case 0x205:
76 		boot_cpu_data.type = CPU_SH7750;
77 		boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_FPU |
78 				   CPU_HAS_PERF_COUNTER;
79 		break;
80 	case 0x206:
81 		boot_cpu_data.type = CPU_SH7750S;
82 		boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_FPU |
83 				   CPU_HAS_PERF_COUNTER;
84 		break;
85 	case 0x1100:
86 		boot_cpu_data.type = CPU_SH7751;
87 		boot_cpu_data.flags |= CPU_HAS_FPU;
88 		break;
89 	case 0x2001:
90 	case 0x2004:
91 		boot_cpu_data.type = CPU_SH7770;
92 		boot_cpu_data.icache.ways = 4;
93 		boot_cpu_data.dcache.ways = 4;
94 
95 		boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_LLSC;
96 		break;
97 	case 0x2006:
98 	case 0x200A:
99 		if (prr == 0x61)
100 			boot_cpu_data.type = CPU_SH7781;
101 		else if (prr == 0xa1)
102 			boot_cpu_data.type = CPU_SH7763;
103 		else
104 			boot_cpu_data.type = CPU_SH7780;
105 
106 		boot_cpu_data.icache.ways = 4;
107 		boot_cpu_data.dcache.ways = 4;
108 
109 		boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER |
110 				   CPU_HAS_LLSC;
111 		break;
112 	case 0x3000:
113 	case 0x3003:
114 	case 0x3009:
115 		boot_cpu_data.type = CPU_SH7343;
116 		boot_cpu_data.icache.ways = 4;
117 		boot_cpu_data.dcache.ways = 4;
118 		boot_cpu_data.flags |= CPU_HAS_LLSC;
119 		break;
120 	case 0x3004:
121 	case 0x3007:
122 		boot_cpu_data.type = CPU_SH7785;
123 		boot_cpu_data.icache.ways = 4;
124 		boot_cpu_data.dcache.ways = 4;
125 		boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER |
126 					  CPU_HAS_LLSC;
127 		break;
128 	case 0x3008:
129 		if (prr == 0xa0) {
130 			boot_cpu_data.type = CPU_SH7722;
131 			boot_cpu_data.icache.ways = 4;
132 			boot_cpu_data.dcache.ways = 4;
133 			boot_cpu_data.flags |= CPU_HAS_LLSC;
134 		}
135 		break;
136 	case 0x4000:	/* 1st cut */
137 	case 0x4001:	/* 2nd cut */
138 		boot_cpu_data.type = CPU_SHX3;
139 		boot_cpu_data.icache.ways = 4;
140 		boot_cpu_data.dcache.ways = 4;
141 		boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER |
142 					  CPU_HAS_LLSC;
143 		break;
144 	case 0x700:
145 		boot_cpu_data.type = CPU_SH4_501;
146 		boot_cpu_data.icache.ways = 2;
147 		boot_cpu_data.dcache.ways = 2;
148 		break;
149 	case 0x600:
150 		boot_cpu_data.type = CPU_SH4_202;
151 		boot_cpu_data.icache.ways = 2;
152 		boot_cpu_data.dcache.ways = 2;
153 		boot_cpu_data.flags |= CPU_HAS_FPU;
154 		break;
155 	case 0x500 ... 0x501:
156 		switch (prr) {
157 		case 0x10:
158 			boot_cpu_data.type = CPU_SH7750R;
159 			break;
160 		case 0x11:
161 			boot_cpu_data.type = CPU_SH7751R;
162 			break;
163 		case 0x50 ... 0x5f:
164 			boot_cpu_data.type = CPU_SH7760;
165 			break;
166 		}
167 
168 		boot_cpu_data.icache.ways = 2;
169 		boot_cpu_data.dcache.ways = 2;
170 
171 		boot_cpu_data.flags |= CPU_HAS_FPU;
172 
173 		break;
174 	default:
175 		boot_cpu_data.type = CPU_SH_NONE;
176 		break;
177 	}
178 
179 #ifdef CONFIG_SH_DIRECT_MAPPED
180 	boot_cpu_data.icache.ways = 1;
181 	boot_cpu_data.dcache.ways = 1;
182 #endif
183 
184 #ifdef CONFIG_CPU_HAS_PTEA
185 	boot_cpu_data.flags |= CPU_HAS_PTEA;
186 #endif
187 
188 	/*
189 	 * On anything that's not a direct-mapped cache, look to the CVR
190 	 * for I/D-cache specifics.
191 	 */
192 	if (boot_cpu_data.icache.ways > 1) {
193 		size = sizes[(cvr >> 20) & 0xf];
194 		boot_cpu_data.icache.way_incr	= (size >> 1);
195 		boot_cpu_data.icache.sets	= (size >> 6);
196 
197 	}
198 
199 	/* And the rest of the D-cache */
200 	if (boot_cpu_data.dcache.ways > 1) {
201 		size = sizes[(cvr >> 16) & 0xf];
202 		boot_cpu_data.dcache.way_incr	= (size >> 1);
203 		boot_cpu_data.dcache.sets	= (size >> 6);
204 	}
205 
206 	/*
207 	 * Setup the L2 cache desc
208 	 *
209 	 * SH-4A's have an optional PIPT L2.
210 	 */
211 	if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) {
212 		/*
213 		 * Size calculation is much more sensible
214 		 * than it is for the L1.
215 		 *
216 		 * Sizes are 128KB, 258KB, 512KB, and 1MB.
217 		 */
218 		size = (cvr & 0xf) << 17;
219 
220 		BUG_ON(!size);
221 
222 		boot_cpu_data.scache.way_incr		= (1 << 16);
223 		boot_cpu_data.scache.entry_shift	= 5;
224 		boot_cpu_data.scache.ways		= 4;
225 		boot_cpu_data.scache.linesz		= L1_CACHE_BYTES;
226 
227 		boot_cpu_data.scache.entry_mask	=
228 			(boot_cpu_data.scache.way_incr -
229 			 boot_cpu_data.scache.linesz);
230 
231 		boot_cpu_data.scache.sets	= size /
232 			(boot_cpu_data.scache.linesz *
233 			 boot_cpu_data.scache.ways);
234 
235 		boot_cpu_data.scache.way_size	=
236 			(boot_cpu_data.scache.sets *
237 			 boot_cpu_data.scache.linesz);
238 	}
239 
240 	return 0;
241 }
242