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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2005-2007 Cavium Networks
7 */
8#include <linux/init.h>
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <linux/smp.h>
12#include <linux/mm.h>
13#include <linux/bitops.h>
14#include <linux/cpu.h>
15#include <linux/io.h>
16
17#include <asm/bcache.h>
18#include <asm/bootinfo.h>
19#include <asm/cacheops.h>
20#include <asm/cpu-features.h>
21#include <asm/page.h>
22#include <asm/pgtable.h>
23#include <asm/r4kcache.h>
24#include <asm/traps.h>
25#include <asm/mmu_context.h>
26#include <asm/war.h>
27
28#include <asm/octeon/octeon.h>
29
30unsigned long long cache_err_dcache[NR_CPUS];
31
32/**
33 * Octeon automatically flushes the dcache on tlb changes, so
34 * from Linux's viewpoint it acts much like a physically
35 * tagged cache. No flushing is needed
36 *
37 */
38static void octeon_flush_data_cache_page(unsigned long addr)
39{
40 /* Nothing to do */
41}
42
43static inline void octeon_local_flush_icache(void)
44{
45 asm volatile ("synci 0($0)");
46}
47
48/*
49 * Flush local I-cache for the specified range.
50 */
51static void local_octeon_flush_icache_range(unsigned long start,
52 unsigned long end)
53{
54 octeon_local_flush_icache();
55}
56
57/**
58 * Flush caches as necessary for all cores affected by a
59 * vma. If no vma is supplied, all cores are flushed.
60 *
61 * @vma: VMA to flush or NULL to flush all icaches.
62 */
63static void octeon_flush_icache_all_cores(struct vm_area_struct *vma)
64{
65 extern void octeon_send_ipi_single(int cpu, unsigned int action);
66#ifdef CONFIG_SMP
67 int cpu;
68 cpumask_t mask;
69#endif
70
71 mb();
72 octeon_local_flush_icache();
73#ifdef CONFIG_SMP
74 preempt_disable();
75 cpu = smp_processor_id();
76
77 /*
78 * If we have a vma structure, we only need to worry about
79 * cores it has been used on
80 */
81 if (vma)
82 mask = *mm_cpumask(vma->vm_mm);
83 else
84 mask = *cpu_online_mask;
85 cpumask_clear_cpu(cpu, &mask);
86 for_each_cpu(cpu, &mask)
87 octeon_send_ipi_single(cpu, SMP_ICACHE_FLUSH);
88
89 preempt_enable();
90#endif
91}
92
93
94/**
95 * Called to flush the icache on all cores
96 */
97static void octeon_flush_icache_all(void)
98{
99 octeon_flush_icache_all_cores(NULL);
100}
101
102
103/**
104 * Called to flush all memory associated with a memory
105 * context.
106 *
107 * @mm: Memory context to flush
108 */
109static void octeon_flush_cache_mm(struct mm_struct *mm)
110{
111 /*
112 * According to the R4K version of this file, CPUs without
113 * dcache aliases don't need to do anything here
114 */
115}
116
117
118/**
119 * Flush a range of kernel addresses out of the icache
120 *
121 */
122static void octeon_flush_icache_range(unsigned long start, unsigned long end)
123{
124 octeon_flush_icache_all_cores(NULL);
125}
126
127
128/**
129 * Flush the icache for a trampoline. These are used for interrupt
130 * and exception hooking.
131 *
132 * @addr: Address to flush
133 */
134static void octeon_flush_cache_sigtramp(unsigned long addr)
135{
136 struct vm_area_struct *vma;
137
138 vma = find_vma(current->mm, addr);
139 octeon_flush_icache_all_cores(vma);
140}
141
142
143/**
144 * Flush a range out of a vma
145 *
146 * @vma: VMA to flush
147 * @start:
148 * @end:
149 */
150static void octeon_flush_cache_range(struct vm_area_struct *vma,
151 unsigned long start, unsigned long end)
152{
153 if (vma->vm_flags & VM_EXEC)
154 octeon_flush_icache_all_cores(vma);
155}
156
157
158/**
159 * Flush a specific page of a vma
160 *
161 * @vma: VMA to flush page for
162 * @page: Page to flush
163 * @pfn:
164 */
165static void octeon_flush_cache_page(struct vm_area_struct *vma,
166 unsigned long page, unsigned long pfn)
167{
168 if (vma->vm_flags & VM_EXEC)
169 octeon_flush_icache_all_cores(vma);
170}
171
172static void octeon_flush_kernel_vmap_range(unsigned long vaddr, int size)
173{
174 BUG();
175}
176
177/**
178 * Probe Octeon's caches
179 *
180 */
181static void __cpuinit probe_octeon(void)
182{
183 unsigned long icache_size;
184 unsigned long dcache_size;
185 unsigned int config1;
186 struct cpuinfo_mips *c = ¤t_cpu_data;
187
188 config1 = read_c0_config1();
189 switch (c->cputype) {
190 case CPU_CAVIUM_OCTEON:
191 case CPU_CAVIUM_OCTEON_PLUS:
192 c->icache.linesz = 2 << ((config1 >> 19) & 7);
193 c->icache.sets = 64 << ((config1 >> 22) & 7);
194 c->icache.ways = 1 + ((config1 >> 16) & 7);
195 c->icache.flags |= MIPS_CACHE_VTAG;
196 icache_size =
197 c->icache.sets * c->icache.ways * c->icache.linesz;
198 c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
199 c->dcache.linesz = 128;
200 if (c->cputype == CPU_CAVIUM_OCTEON_PLUS)
201 c->dcache.sets = 2; /* CN5XXX has two Dcache sets */
202 else
203 c->dcache.sets = 1; /* CN3XXX has one Dcache set */
204 c->dcache.ways = 64;
205 dcache_size =
206 c->dcache.sets * c->dcache.ways * c->dcache.linesz;
207 c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
208 c->options |= MIPS_CPU_PREFETCH;
209 break;
210
211 case CPU_CAVIUM_OCTEON2:
212 c->icache.linesz = 2 << ((config1 >> 19) & 7);
213 c->icache.sets = 8;
214 c->icache.ways = 37;
215 c->icache.flags |= MIPS_CACHE_VTAG;
216 icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
217
218 c->dcache.linesz = 128;
219 c->dcache.ways = 32;
220 c->dcache.sets = 8;
221 dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
222 c->options |= MIPS_CPU_PREFETCH;
223 break;
224
225 default:
226 panic("Unsupported Cavium Networks CPU type");
227 break;
228 }
229
230 /* compute a couple of other cache variables */
231 c->icache.waysize = icache_size / c->icache.ways;
232 c->dcache.waysize = dcache_size / c->dcache.ways;
233
234 c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
235 c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);
236
237 if (smp_processor_id() == 0) {
238 pr_notice("Primary instruction cache %ldkB, %s, %d way, "
239 "%d sets, linesize %d bytes.\n",
240 icache_size >> 10,
241 cpu_has_vtag_icache ?
242 "virtually tagged" : "physically tagged",
243 c->icache.ways, c->icache.sets, c->icache.linesz);
244
245 pr_notice("Primary data cache %ldkB, %d-way, %d sets, "
246 "linesize %d bytes.\n",
247 dcache_size >> 10, c->dcache.ways,
248 c->dcache.sets, c->dcache.linesz);
249 }
250}
251
252static void __cpuinit octeon_cache_error_setup(void)
253{
254 extern char except_vec2_octeon;
255 set_handler(0x100, &except_vec2_octeon, 0x80);
256}
257
258/**
259 * Setup the Octeon cache flush routines
260 *
261 */
262void __cpuinit octeon_cache_init(void)
263{
264 probe_octeon();
265
266 shm_align_mask = PAGE_SIZE - 1;
267
268 flush_cache_all = octeon_flush_icache_all;
269 __flush_cache_all = octeon_flush_icache_all;
270 flush_cache_mm = octeon_flush_cache_mm;
271 flush_cache_page = octeon_flush_cache_page;
272 flush_cache_range = octeon_flush_cache_range;
273 flush_cache_sigtramp = octeon_flush_cache_sigtramp;
274 flush_icache_all = octeon_flush_icache_all;
275 flush_data_cache_page = octeon_flush_data_cache_page;
276 flush_icache_range = octeon_flush_icache_range;
277 local_flush_icache_range = local_octeon_flush_icache_range;
278
279 __flush_kernel_vmap_range = octeon_flush_kernel_vmap_range;
280
281 build_clear_page();
282 build_copy_page();
283
284 board_cache_error_setup = octeon_cache_error_setup;
285}
286
287/**
288 * Handle a cache error exception
289 */
290
291static void cache_parity_error_octeon(int non_recoverable)
292{
293 unsigned long coreid = cvmx_get_core_num();
294 uint64_t icache_err = read_octeon_c0_icacheerr();
295
296 pr_err("Cache error exception:\n");
297 pr_err("cp0_errorepc == %lx\n", read_c0_errorepc());
298 if (icache_err & 1) {
299 pr_err("CacheErr (Icache) == %llx\n",
300 (unsigned long long)icache_err);
301 write_octeon_c0_icacheerr(0);
302 }
303 if (cache_err_dcache[coreid] & 1) {
304 pr_err("CacheErr (Dcache) == %llx\n",
305 (unsigned long long)cache_err_dcache[coreid]);
306 cache_err_dcache[coreid] = 0;
307 }
308
309 if (non_recoverable)
310 panic("Can't handle cache error: nested exception");
311}
312
313/**
314 * Called when the the exception is recoverable
315 */
316
317asmlinkage void cache_parity_error_octeon_recoverable(void)
318{
319 cache_parity_error_octeon(0);
320}
321
322/**
323 * Called when the the exception is not recoverable
324 */
325
326asmlinkage void cache_parity_error_octeon_non_recoverable(void)
327{
328 cache_parity_error_octeon(1);
329}