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
13 #include <linux/init.h>
15 #include <asm/processor.h>
16 #include <asm/cache.h>
18 int __init detect_cpu_and_cache_system(void)
20 unsigned long pvr, prr, cvr;
23 static unsigned long sizes[16] = {
31 pvr = (ctrl_inl(CCN_PVR) >> 8) & 0xffffff;
32 prr = (ctrl_inl(CCN_PRR) >> 4) & 0xff;
33 cvr = (ctrl_inl(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 if ((cvr & 0x10000000) == 0)
61 boot_cpu_data.flags |= CPU_HAS_DSP;
63 boot_cpu_data.flags |= CPU_HAS_LLSC;
64 boot_cpu_data.cut_major = pvr & 0x7f;
67 /* FPU detection works for everyone */
68 if ((cvr & 0x20000000) == 1)
69 boot_cpu_data.flags |= CPU_HAS_FPU;
71 /* Mask off the upper chip ID */
75 * Probe the underlying processor version/revision and
76 * adjust cpu_data setup accordingly.
80 boot_cpu_data.type = CPU_SH7750;
81 boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_FPU |
85 boot_cpu_data.type = CPU_SH7750S;
86 boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_FPU |
90 boot_cpu_data.type = CPU_SH7751;
91 boot_cpu_data.flags |= CPU_HAS_FPU;
95 boot_cpu_data.type = CPU_SH7770;
96 boot_cpu_data.icache.ways = 4;
97 boot_cpu_data.dcache.ways = 4;
99 boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_LLSC;
104 boot_cpu_data.type = CPU_SH7781;
105 else if (prr == 0xa1)
106 boot_cpu_data.type = CPU_SH7763;
108 boot_cpu_data.type = CPU_SH7780;
110 boot_cpu_data.icache.ways = 4;
111 boot_cpu_data.dcache.ways = 4;
113 boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER |
119 boot_cpu_data.type = CPU_SH7343;
120 boot_cpu_data.icache.ways = 4;
121 boot_cpu_data.dcache.ways = 4;
122 boot_cpu_data.flags |= CPU_HAS_LLSC;
126 boot_cpu_data.type = CPU_SH7785;
127 boot_cpu_data.icache.ways = 4;
128 boot_cpu_data.dcache.ways = 4;
129 boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER |
133 boot_cpu_data.icache.ways = 4;
134 boot_cpu_data.dcache.ways = 4;
135 boot_cpu_data.flags |= CPU_HAS_LLSC;
140 boot_cpu_data.type = CPU_SH7723;
141 boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_L2_CACHE;
144 boot_cpu_data.type = CPU_SH7366;
148 boot_cpu_data.type = CPU_SH7722;
152 case 0x4000: /* 1st cut */
153 case 0x4001: /* 2nd cut */
154 boot_cpu_data.type = CPU_SHX3;
155 boot_cpu_data.icache.ways = 4;
156 boot_cpu_data.dcache.ways = 4;
157 boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER |
161 boot_cpu_data.type = CPU_SH4_501;
162 boot_cpu_data.icache.ways = 2;
163 boot_cpu_data.dcache.ways = 2;
166 boot_cpu_data.type = CPU_SH4_202;
167 boot_cpu_data.icache.ways = 2;
168 boot_cpu_data.dcache.ways = 2;
169 boot_cpu_data.flags |= CPU_HAS_FPU;
171 case 0x500 ... 0x501:
174 boot_cpu_data.type = CPU_SH7750R;
177 boot_cpu_data.type = CPU_SH7751R;
180 boot_cpu_data.type = CPU_SH7760;
184 boot_cpu_data.icache.ways = 2;
185 boot_cpu_data.dcache.ways = 2;
187 boot_cpu_data.flags |= CPU_HAS_FPU;
191 boot_cpu_data.type = CPU_SH_NONE;
195 #ifdef CONFIG_SH_DIRECT_MAPPED
196 boot_cpu_data.icache.ways = 1;
197 boot_cpu_data.dcache.ways = 1;
200 #ifdef CONFIG_CPU_HAS_PTEA
201 boot_cpu_data.flags |= CPU_HAS_PTEA;
205 * On anything that's not a direct-mapped cache, look to the CVR
206 * for I/D-cache specifics.
208 if (boot_cpu_data.icache.ways > 1) {
209 size = sizes[(cvr >> 20) & 0xf];
210 boot_cpu_data.icache.way_incr = (size >> 1);
211 boot_cpu_data.icache.sets = (size >> 6);
215 /* And the rest of the D-cache */
216 if (boot_cpu_data.dcache.ways > 1) {
217 size = sizes[(cvr >> 16) & 0xf];
218 boot_cpu_data.dcache.way_incr = (size >> 1);
219 boot_cpu_data.dcache.sets = (size >> 6);
223 * Setup the L2 cache desc
225 * SH-4A's have an optional PIPT L2.
227 if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) {
228 /* Bug if we can't decode the L2 info */
229 BUG_ON(!(cvr & 0xf));
231 /* Silicon and specifications have clearly never met.. */
235 * Size calculation is much more sensible
236 * than it is for the L1.
238 * Sizes are 128KB, 258KB, 512KB, and 1MB.
240 size = (cvr & 0xf) << 17;
244 boot_cpu_data.scache.way_incr = (1 << 16);
245 boot_cpu_data.scache.entry_shift = 5;
246 boot_cpu_data.scache.ways = 4;
247 boot_cpu_data.scache.linesz = L1_CACHE_BYTES;
249 boot_cpu_data.scache.entry_mask =
250 (boot_cpu_data.scache.way_incr -
251 boot_cpu_data.scache.linesz);
253 boot_cpu_data.scache.sets = size /
254 (boot_cpu_data.scache.linesz *
255 boot_cpu_data.scache.ways);
257 boot_cpu_data.scache.way_size =
258 (boot_cpu_data.scache.sets *
259 boot_cpu_data.scache.linesz);