Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / arch / sh / kernel / cpu / sh4 / probe.c
blob971cf0fce4f5ce7988f0f0aee831f6a6c38ee27b
1 /*
2 * arch/sh/kernel/cpu/sh4/probe.c
4 * CPU Subtype Probing for SH-4.
6 * Copyright (C) 2001 - 2007 Paul Mundt
7 * Copyright (C) 2003 Richard Curnow
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.
13 #include <linux/init.h>
14 #include <linux/io.h>
15 #include <asm/processor.h>
16 #include <asm/cache.h>
18 void __cpuinit cpu_probe(void)
20 unsigned long pvr, prr, cvr;
21 unsigned long size;
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)
31 pvr = (__raw_readl(CCN_PVR) >> 8) & 0xffffff;
32 prr = (__raw_readl(CCN_PRR) >> 4) & 0xff;
33 cvr = (__raw_readl(CCN_CVR));
36 * Setup some sane SH-4 defaults for the icache
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;
45 * And again for the dcache ..
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;
53 /* We don't know the chip cut */
54 boot_cpu_data.cut_major = boot_cpu_data.cut_minor = -1;
57 * Setup some generic flags we can probe on SH-4A parts
59 if (((pvr >> 16) & 0xff) == 0x10) {
60 boot_cpu_data.family = CPU_FAMILY_SH4A;
62 if ((cvr & 0x10000000) == 0) {
63 boot_cpu_data.flags |= CPU_HAS_DSP;
64 boot_cpu_data.family = CPU_FAMILY_SH4AL_DSP;
67 boot_cpu_data.flags |= CPU_HAS_LLSC | CPU_HAS_PERF_COUNTER;
68 boot_cpu_data.cut_major = pvr & 0x7f;
70 boot_cpu_data.icache.ways = 4;
71 boot_cpu_data.dcache.ways = 4;
72 } else {
73 /* And some SH-4 defaults.. */
74 boot_cpu_data.flags |= CPU_HAS_PTEA | CPU_HAS_FPU;
75 boot_cpu_data.family = CPU_FAMILY_SH4;
78 /* FPU detection works for almost everyone */
79 if ((cvr & 0x20000000))
80 boot_cpu_data.flags |= CPU_HAS_FPU;
82 /* Mask off the upper chip ID */
83 pvr &= 0xffff;
86 * Probe the underlying processor version/revision and
87 * adjust cpu_data setup accordingly.
89 switch (pvr) {
90 case 0x205:
91 boot_cpu_data.type = CPU_SH7750;
92 boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG |
93 CPU_HAS_PERF_COUNTER;
94 break;
95 case 0x206:
96 boot_cpu_data.type = CPU_SH7750S;
97 boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG |
98 CPU_HAS_PERF_COUNTER;
99 break;
100 case 0x1100:
101 boot_cpu_data.type = CPU_SH7751;
102 break;
103 case 0x2001:
104 case 0x2004:
105 boot_cpu_data.type = CPU_SH7770;
106 break;
107 case 0x2006:
108 case 0x200A:
109 if (prr == 0x61)
110 boot_cpu_data.type = CPU_SH7781;
111 else if (prr == 0xa1)
112 boot_cpu_data.type = CPU_SH7763;
113 else
114 boot_cpu_data.type = CPU_SH7780;
116 break;
117 case 0x3000:
118 case 0x3003:
119 case 0x3009:
120 boot_cpu_data.type = CPU_SH7343;
121 break;
122 case 0x3004:
123 case 0x3007:
124 boot_cpu_data.type = CPU_SH7785;
125 break;
126 case 0x4004:
127 case 0x4005:
128 boot_cpu_data.type = CPU_SH7786;
129 boot_cpu_data.flags |= CPU_HAS_PTEAEX | CPU_HAS_L2_CACHE;
130 break;
131 case 0x3008:
132 switch (prr) {
133 case 0x50:
134 case 0x51:
135 boot_cpu_data.type = CPU_SH7723;
136 boot_cpu_data.flags |= CPU_HAS_L2_CACHE;
137 break;
138 case 0x70:
139 boot_cpu_data.type = CPU_SH7366;
140 break;
141 case 0xa0:
142 case 0xa1:
143 boot_cpu_data.type = CPU_SH7722;
144 break;
146 break;
147 case 0x300b:
148 switch (prr) {
149 case 0x20:
150 boot_cpu_data.type = CPU_SH7724;
151 boot_cpu_data.flags |= CPU_HAS_L2_CACHE;
152 break;
153 case 0x10:
154 case 0x11:
155 boot_cpu_data.type = CPU_SH7757;
156 break;
157 case 0xd0:
158 case 0x40: /* yon-ten-go */
159 boot_cpu_data.type = CPU_SH7372;
160 break;
163 break;
164 case 0x4000: /* 1st cut */
165 case 0x4001: /* 2nd cut */
166 boot_cpu_data.type = CPU_SHX3;
167 break;
168 case 0x700:
169 boot_cpu_data.type = CPU_SH4_501;
170 boot_cpu_data.flags &= ~CPU_HAS_FPU;
171 boot_cpu_data.icache.ways = 2;
172 boot_cpu_data.dcache.ways = 2;
173 break;
174 case 0x600:
175 boot_cpu_data.type = CPU_SH4_202;
176 boot_cpu_data.icache.ways = 2;
177 boot_cpu_data.dcache.ways = 2;
178 break;
179 case 0x500 ... 0x501:
180 switch (prr) {
181 case 0x10:
182 boot_cpu_data.type = CPU_SH7750R;
183 break;
184 case 0x11:
185 boot_cpu_data.type = CPU_SH7751R;
186 break;
187 case 0x50 ... 0x5f:
188 boot_cpu_data.type = CPU_SH7760;
189 break;
192 boot_cpu_data.icache.ways = 2;
193 boot_cpu_data.dcache.ways = 2;
195 break;
199 * On anything that's not a direct-mapped cache, look to the CVR
200 * for I/D-cache specifics.
202 if (boot_cpu_data.icache.ways > 1) {
203 size = sizes[(cvr >> 20) & 0xf];
204 boot_cpu_data.icache.way_incr = (size >> 1);
205 boot_cpu_data.icache.sets = (size >> 6);
209 /* And the rest of the D-cache */
210 if (boot_cpu_data.dcache.ways > 1) {
211 size = sizes[(cvr >> 16) & 0xf];
212 boot_cpu_data.dcache.way_incr = (size >> 1);
213 boot_cpu_data.dcache.sets = (size >> 6);
217 * SH-4A's have an optional PIPT L2.
219 if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) {
221 * Verify that it really has something hooked up, this
222 * is the safety net for CPUs that have optional L2
223 * support yet do not implement it.
225 if ((cvr & 0xf) == 0)
226 boot_cpu_data.flags &= ~CPU_HAS_L2_CACHE;
227 else {
229 * Silicon and specifications have clearly never
230 * met..
232 cvr ^= 0xf;
235 * Size calculation is much more sensible
236 * than it is for the L1.
238 * Sizes are 128KB, 256KB, 512KB, and 1MB.
240 size = (cvr & 0xf) << 17;
242 boot_cpu_data.scache.way_incr = (1 << 16);
243 boot_cpu_data.scache.entry_shift = 5;
244 boot_cpu_data.scache.ways = 4;
245 boot_cpu_data.scache.linesz = L1_CACHE_BYTES;
247 boot_cpu_data.scache.entry_mask =
248 (boot_cpu_data.scache.way_incr -
249 boot_cpu_data.scache.linesz);
251 boot_cpu_data.scache.sets = size /
252 (boot_cpu_data.scache.linesz *
253 boot_cpu_data.scache.ways);
255 boot_cpu_data.scache.way_size =
256 (boot_cpu_data.scache.sets *
257 boot_cpu_data.scache.linesz);