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1da177e4 LT |
1 | /* |
2 | * linux/arch/alpha/kernel/core_t2.c | |
3 | * | |
4 | * Written by Jay A Estabrook (jestabro@amt.tay1.dec.com). | |
5 | * December 1996. | |
6 | * | |
7 | * based on CIA code by David A Rusling (david.rusling@reo.mts.dec.com) | |
8 | * | |
9 | * Code common to all T2 core logic chips. | |
10 | */ | |
11 | ||
12 | #define __EXTERN_INLINE | |
13 | #include <asm/io.h> | |
14 | #include <asm/core_t2.h> | |
15 | #undef __EXTERN_INLINE | |
16 | ||
17 | #include <linux/types.h> | |
18 | #include <linux/pci.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/init.h> | |
21 | ||
22 | #include <asm/ptrace.h> | |
23 | #include <asm/delay.h> | |
24 | ||
25 | #include "proto.h" | |
26 | #include "pci_impl.h" | |
27 | ||
28 | /* For dumping initial DMA window settings. */ | |
29 | #define DEBUG_PRINT_INITIAL_SETTINGS 0 | |
30 | ||
31 | /* For dumping final DMA window settings. */ | |
32 | #define DEBUG_PRINT_FINAL_SETTINGS 0 | |
33 | ||
34 | /* | |
35 | * By default, we direct-map starting at 2GB, in order to allow the | |
36 | * maximum size direct-map window (2GB) to match the maximum amount of | |
37 | * memory (2GB) that can be present on SABLEs. But that limits the | |
38 | * floppy to DMA only via the scatter/gather window set up for 8MB | |
39 | * ISA DMA, since the maximum ISA DMA address is 2GB-1. | |
40 | * | |
41 | * For now, this seems a reasonable trade-off: even though most SABLEs | |
42 | * have less than 1GB of memory, floppy usage/performance will not | |
43 | * really be affected by forcing it to go via scatter/gather... | |
44 | */ | |
45 | #define T2_DIRECTMAP_2G 1 | |
46 | ||
47 | #if T2_DIRECTMAP_2G | |
48 | # define T2_DIRECTMAP_START 0x80000000UL | |
49 | # define T2_DIRECTMAP_LENGTH 0x80000000UL | |
50 | #else | |
51 | # define T2_DIRECTMAP_START 0x40000000UL | |
52 | # define T2_DIRECTMAP_LENGTH 0x40000000UL | |
53 | #endif | |
54 | ||
55 | /* The ISA scatter/gather window settings. */ | |
56 | #define T2_ISA_SG_START 0x00800000UL | |
57 | #define T2_ISA_SG_LENGTH 0x00800000UL | |
58 | ||
59 | /* | |
60 | * NOTE: Herein lie back-to-back mb instructions. They are magic. | |
61 | * One plausible explanation is that the i/o controller does not properly | |
62 | * handle the system transaction. Another involves timing. Ho hum. | |
63 | */ | |
64 | ||
65 | /* | |
66 | * BIOS32-style PCI interface: | |
67 | */ | |
68 | ||
69 | #define DEBUG_CONFIG 0 | |
70 | ||
71 | #if DEBUG_CONFIG | |
72 | # define DBG(args) printk args | |
73 | #else | |
74 | # define DBG(args) | |
75 | #endif | |
76 | ||
d559d4a2 IK |
77 | DEFINE_SPINLOCK(t2_hae_lock); |
78 | ||
1da177e4 LT |
79 | static volatile unsigned int t2_mcheck_any_expected; |
80 | static volatile unsigned int t2_mcheck_last_taken; | |
81 | ||
82 | /* Place to save the DMA Window registers as set up by SRM | |
83 | for restoration during shutdown. */ | |
84 | static struct | |
85 | { | |
86 | struct { | |
87 | unsigned long wbase; | |
88 | unsigned long wmask; | |
89 | unsigned long tbase; | |
90 | } window[2]; | |
91 | unsigned long hae_1; | |
92 | unsigned long hae_2; | |
93 | unsigned long hae_3; | |
94 | unsigned long hae_4; | |
95 | unsigned long hbase; | |
96 | } t2_saved_config __attribute((common)); | |
97 | ||
98 | /* | |
99 | * Given a bus, device, and function number, compute resulting | |
100 | * configuration space address and setup the T2_HAXR2 register | |
101 | * accordingly. It is therefore not safe to have concurrent | |
102 | * invocations to configuration space access routines, but there | |
103 | * really shouldn't be any need for this. | |
104 | * | |
105 | * Type 0: | |
106 | * | |
107 | * 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1 | |
108 | * 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0 | |
109 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
110 | * | | |D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|0| | |
111 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
112 | * | |
113 | * 31:11 Device select bit. | |
114 | * 10:8 Function number | |
115 | * 7:2 Register number | |
116 | * | |
117 | * Type 1: | |
118 | * | |
119 | * 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1 | |
120 | * 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0 | |
121 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
122 | * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1| | |
123 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
124 | * | |
125 | * 31:24 reserved | |
126 | * 23:16 bus number (8 bits = 128 possible buses) | |
127 | * 15:11 Device number (5 bits) | |
128 | * 10:8 function number | |
129 | * 7:2 register number | |
130 | * | |
131 | * Notes: | |
132 | * The function number selects which function of a multi-function device | |
133 | * (e.g., SCSI and Ethernet). | |
134 | * | |
135 | * The register selects a DWORD (32 bit) register offset. Hence it | |
136 | * doesn't get shifted by 2 bits as we want to "drop" the bottom two | |
137 | * bits. | |
138 | */ | |
139 | ||
140 | static int | |
141 | mk_conf_addr(struct pci_bus *pbus, unsigned int device_fn, int where, | |
142 | unsigned long *pci_addr, unsigned char *type1) | |
143 | { | |
144 | unsigned long addr; | |
145 | u8 bus = pbus->number; | |
146 | ||
147 | DBG(("mk_conf_addr(bus=%d, dfn=0x%x, where=0x%x," | |
148 | " addr=0x%lx, type1=0x%x)\n", | |
149 | bus, device_fn, where, pci_addr, type1)); | |
150 | ||
151 | if (bus == 0) { | |
152 | int device = device_fn >> 3; | |
153 | ||
154 | /* Type 0 configuration cycle. */ | |
155 | ||
156 | if (device > 8) { | |
157 | DBG(("mk_conf_addr: device (%d)>20, returning -1\n", | |
158 | device)); | |
159 | return -1; | |
160 | } | |
161 | ||
162 | *type1 = 0; | |
163 | addr = (0x0800L << device) | ((device_fn & 7) << 8) | (where); | |
164 | } else { | |
165 | /* Type 1 configuration cycle. */ | |
166 | *type1 = 1; | |
167 | addr = (bus << 16) | (device_fn << 8) | (where); | |
168 | } | |
169 | *pci_addr = addr; | |
170 | DBG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr)); | |
171 | return 0; | |
172 | } | |
173 | ||
174 | /* | |
175 | * NOTE: both conf_read() and conf_write() may set HAE_3 when needing | |
176 | * to do type1 access. This is protected by the use of spinlock IRQ | |
177 | * primitives in the wrapper functions pci_{read,write}_config_*() | |
178 | * defined in drivers/pci/pci.c. | |
179 | */ | |
180 | static unsigned int | |
181 | conf_read(unsigned long addr, unsigned char type1) | |
182 | { | |
183 | unsigned int value, cpu, taken; | |
184 | unsigned long t2_cfg = 0; | |
185 | ||
186 | cpu = smp_processor_id(); | |
187 | ||
188 | DBG(("conf_read(addr=0x%lx, type1=%d)\n", addr, type1)); | |
189 | ||
190 | /* If Type1 access, must set T2 CFG. */ | |
191 | if (type1) { | |
192 | t2_cfg = *(vulp)T2_HAE_3 & ~0xc0000000UL; | |
193 | *(vulp)T2_HAE_3 = 0x40000000UL | t2_cfg; | |
194 | mb(); | |
195 | } | |
196 | mb(); | |
197 | draina(); | |
198 | ||
199 | mcheck_expected(cpu) = 1; | |
200 | mcheck_taken(cpu) = 0; | |
201 | t2_mcheck_any_expected |= (1 << cpu); | |
202 | mb(); | |
203 | ||
204 | /* Access configuration space. */ | |
205 | value = *(vuip)addr; | |
206 | mb(); | |
207 | mb(); /* magic */ | |
208 | ||
209 | /* Wait for possible mcheck. Also, this lets other CPUs clear | |
210 | their mchecks as well, as they can reliably tell when | |
211 | another CPU is in the midst of handling a real mcheck via | |
212 | the "taken" function. */ | |
213 | udelay(100); | |
214 | ||
215 | if ((taken = mcheck_taken(cpu))) { | |
216 | mcheck_taken(cpu) = 0; | |
217 | t2_mcheck_last_taken |= (1 << cpu); | |
218 | value = 0xffffffffU; | |
219 | mb(); | |
220 | } | |
221 | mcheck_expected(cpu) = 0; | |
222 | t2_mcheck_any_expected = 0; | |
223 | mb(); | |
224 | ||
225 | /* If Type1 access, must reset T2 CFG so normal IO space ops work. */ | |
226 | if (type1) { | |
227 | *(vulp)T2_HAE_3 = t2_cfg; | |
228 | mb(); | |
229 | } | |
230 | ||
231 | return value; | |
232 | } | |
233 | ||
234 | static void | |
235 | conf_write(unsigned long addr, unsigned int value, unsigned char type1) | |
236 | { | |
237 | unsigned int cpu, taken; | |
238 | unsigned long t2_cfg = 0; | |
239 | ||
240 | cpu = smp_processor_id(); | |
241 | ||
242 | /* If Type1 access, must set T2 CFG. */ | |
243 | if (type1) { | |
244 | t2_cfg = *(vulp)T2_HAE_3 & ~0xc0000000UL; | |
245 | *(vulp)T2_HAE_3 = t2_cfg | 0x40000000UL; | |
246 | mb(); | |
247 | } | |
248 | mb(); | |
249 | draina(); | |
250 | ||
251 | mcheck_expected(cpu) = 1; | |
252 | mcheck_taken(cpu) = 0; | |
253 | t2_mcheck_any_expected |= (1 << cpu); | |
254 | mb(); | |
255 | ||
256 | /* Access configuration space. */ | |
257 | *(vuip)addr = value; | |
258 | mb(); | |
259 | mb(); /* magic */ | |
260 | ||
261 | /* Wait for possible mcheck. Also, this lets other CPUs clear | |
262 | their mchecks as well, as they can reliably tell when | |
263 | this CPU is in the midst of handling a real mcheck via | |
264 | the "taken" function. */ | |
265 | udelay(100); | |
266 | ||
267 | if ((taken = mcheck_taken(cpu))) { | |
268 | mcheck_taken(cpu) = 0; | |
269 | t2_mcheck_last_taken |= (1 << cpu); | |
270 | mb(); | |
271 | } | |
272 | mcheck_expected(cpu) = 0; | |
273 | t2_mcheck_any_expected = 0; | |
274 | mb(); | |
275 | ||
276 | /* If Type1 access, must reset T2 CFG so normal IO space ops work. */ | |
277 | if (type1) { | |
278 | *(vulp)T2_HAE_3 = t2_cfg; | |
279 | mb(); | |
280 | } | |
281 | } | |
282 | ||
283 | static int | |
284 | t2_read_config(struct pci_bus *bus, unsigned int devfn, int where, | |
285 | int size, u32 *value) | |
286 | { | |
287 | unsigned long addr, pci_addr; | |
288 | unsigned char type1; | |
289 | int shift; | |
290 | long mask; | |
291 | ||
292 | if (mk_conf_addr(bus, devfn, where, &pci_addr, &type1)) | |
293 | return PCIBIOS_DEVICE_NOT_FOUND; | |
294 | ||
295 | mask = (size - 1) * 8; | |
296 | shift = (where & 3) * 8; | |
297 | addr = (pci_addr << 5) + mask + T2_CONF; | |
298 | *value = conf_read(addr, type1) >> (shift); | |
299 | return PCIBIOS_SUCCESSFUL; | |
300 | } | |
301 | ||
302 | static int | |
303 | t2_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size, | |
304 | u32 value) | |
305 | { | |
306 | unsigned long addr, pci_addr; | |
307 | unsigned char type1; | |
308 | long mask; | |
309 | ||
310 | if (mk_conf_addr(bus, devfn, where, &pci_addr, &type1)) | |
311 | return PCIBIOS_DEVICE_NOT_FOUND; | |
312 | ||
313 | mask = (size - 1) * 8; | |
314 | addr = (pci_addr << 5) + mask + T2_CONF; | |
315 | conf_write(addr, value << ((where & 3) * 8), type1); | |
316 | return PCIBIOS_SUCCESSFUL; | |
317 | } | |
318 | ||
319 | struct pci_ops t2_pci_ops = | |
320 | { | |
321 | .read = t2_read_config, | |
322 | .write = t2_write_config, | |
323 | }; | |
324 | \f | |
325 | static void __init | |
326 | t2_direct_map_window1(unsigned long base, unsigned long length) | |
327 | { | |
328 | unsigned long temp; | |
329 | ||
330 | __direct_map_base = base; | |
331 | __direct_map_size = length; | |
332 | ||
333 | temp = (base & 0xfff00000UL) | ((base + length - 1) >> 20); | |
334 | *(vulp)T2_WBASE1 = temp | 0x80000UL; /* OR in ENABLE bit */ | |
335 | temp = (length - 1) & 0xfff00000UL; | |
336 | *(vulp)T2_WMASK1 = temp; | |
337 | *(vulp)T2_TBASE1 = 0; | |
338 | ||
339 | #if DEBUG_PRINT_FINAL_SETTINGS | |
340 | printk("%s: setting WBASE1=0x%lx WMASK1=0x%lx TBASE1=0x%lx\n", | |
bbb8d343 | 341 | __func__, *(vulp)T2_WBASE1, *(vulp)T2_WMASK1, *(vulp)T2_TBASE1); |
1da177e4 LT |
342 | #endif |
343 | } | |
344 | ||
345 | static void __init | |
346 | t2_sg_map_window2(struct pci_controller *hose, | |
347 | unsigned long base, | |
348 | unsigned long length) | |
349 | { | |
350 | unsigned long temp; | |
351 | ||
352 | /* Note we can only do 1 SG window, as the other is for direct, so | |
353 | do an ISA SG area, especially for the floppy. */ | |
354 | hose->sg_isa = iommu_arena_new(hose, base, length, 0); | |
355 | hose->sg_pci = NULL; | |
356 | ||
357 | temp = (base & 0xfff00000UL) | ((base + length - 1) >> 20); | |
358 | *(vulp)T2_WBASE2 = temp | 0xc0000UL; /* OR in ENABLE/SG bits */ | |
359 | temp = (length - 1) & 0xfff00000UL; | |
360 | *(vulp)T2_WMASK2 = temp; | |
361 | *(vulp)T2_TBASE2 = virt_to_phys(hose->sg_isa->ptes) >> 1; | |
362 | mb(); | |
363 | ||
364 | t2_pci_tbi(hose, 0, -1); /* flush TLB all */ | |
365 | ||
366 | #if DEBUG_PRINT_FINAL_SETTINGS | |
367 | printk("%s: setting WBASE2=0x%lx WMASK2=0x%lx TBASE2=0x%lx\n", | |
bbb8d343 | 368 | __func__, *(vulp)T2_WBASE2, *(vulp)T2_WMASK2, *(vulp)T2_TBASE2); |
1da177e4 LT |
369 | #endif |
370 | } | |
371 | ||
372 | static void __init | |
373 | t2_save_configuration(void) | |
374 | { | |
375 | #if DEBUG_PRINT_INITIAL_SETTINGS | |
bbb8d343 HH |
376 | printk("%s: HAE_1 was 0x%lx\n", __func__, srm_hae); /* HW is 0 */ |
377 | printk("%s: HAE_2 was 0x%lx\n", __func__, *(vulp)T2_HAE_2); | |
378 | printk("%s: HAE_3 was 0x%lx\n", __func__, *(vulp)T2_HAE_3); | |
379 | printk("%s: HAE_4 was 0x%lx\n", __func__, *(vulp)T2_HAE_4); | |
380 | printk("%s: HBASE was 0x%lx\n", __func__, *(vulp)T2_HBASE); | |
1da177e4 | 381 | |
bbb8d343 | 382 | printk("%s: WBASE1=0x%lx WMASK1=0x%lx TBASE1=0x%lx\n", __func__, |
1da177e4 | 383 | *(vulp)T2_WBASE1, *(vulp)T2_WMASK1, *(vulp)T2_TBASE1); |
bbb8d343 | 384 | printk("%s: WBASE2=0x%lx WMASK2=0x%lx TBASE2=0x%lx\n", __func__, |
1da177e4 LT |
385 | *(vulp)T2_WBASE2, *(vulp)T2_WMASK2, *(vulp)T2_TBASE2); |
386 | #endif | |
387 | ||
388 | /* | |
389 | * Save the DMA Window registers. | |
390 | */ | |
391 | t2_saved_config.window[0].wbase = *(vulp)T2_WBASE1; | |
392 | t2_saved_config.window[0].wmask = *(vulp)T2_WMASK1; | |
393 | t2_saved_config.window[0].tbase = *(vulp)T2_TBASE1; | |
394 | t2_saved_config.window[1].wbase = *(vulp)T2_WBASE2; | |
395 | t2_saved_config.window[1].wmask = *(vulp)T2_WMASK2; | |
396 | t2_saved_config.window[1].tbase = *(vulp)T2_TBASE2; | |
397 | ||
398 | t2_saved_config.hae_1 = srm_hae; /* HW is already set to 0 */ | |
399 | t2_saved_config.hae_2 = *(vulp)T2_HAE_2; | |
400 | t2_saved_config.hae_3 = *(vulp)T2_HAE_3; | |
401 | t2_saved_config.hae_4 = *(vulp)T2_HAE_4; | |
402 | t2_saved_config.hbase = *(vulp)T2_HBASE; | |
403 | } | |
404 | ||
405 | void __init | |
406 | t2_init_arch(void) | |
407 | { | |
408 | struct pci_controller *hose; | |
409 | unsigned long temp; | |
410 | unsigned int i; | |
411 | ||
412 | for (i = 0; i < NR_CPUS; i++) { | |
413 | mcheck_expected(i) = 0; | |
414 | mcheck_taken(i) = 0; | |
415 | } | |
416 | t2_mcheck_any_expected = 0; | |
417 | t2_mcheck_last_taken = 0; | |
418 | ||
419 | /* Enable scatter/gather TLB use. */ | |
420 | temp = *(vulp)T2_IOCSR; | |
421 | if (!(temp & (0x1UL << 26))) { | |
422 | printk("t2_init_arch: enabling SG TLB, IOCSR was 0x%lx\n", | |
423 | temp); | |
424 | *(vulp)T2_IOCSR = temp | (0x1UL << 26); | |
425 | mb(); | |
426 | *(vulp)T2_IOCSR; /* read it back to make sure */ | |
427 | } | |
428 | ||
429 | t2_save_configuration(); | |
430 | ||
431 | /* | |
432 | * Create our single hose. | |
433 | */ | |
434 | pci_isa_hose = hose = alloc_pci_controller(); | |
435 | hose->io_space = &ioport_resource; | |
436 | hose->mem_space = &iomem_resource; | |
437 | hose->index = 0; | |
438 | ||
439 | hose->sparse_mem_base = T2_SPARSE_MEM - IDENT_ADDR; | |
440 | hose->dense_mem_base = T2_DENSE_MEM - IDENT_ADDR; | |
441 | hose->sparse_io_base = T2_IO - IDENT_ADDR; | |
442 | hose->dense_io_base = 0; | |
443 | ||
444 | /* | |
445 | * Set up the PCI->physical memory translation windows. | |
446 | * | |
447 | * Window 1 is direct mapped. | |
448 | * Window 2 is scatter/gather (for ISA). | |
449 | */ | |
450 | ||
451 | t2_direct_map_window1(T2_DIRECTMAP_START, T2_DIRECTMAP_LENGTH); | |
452 | ||
453 | /* Always make an ISA DMA window. */ | |
454 | t2_sg_map_window2(hose, T2_ISA_SG_START, T2_ISA_SG_LENGTH); | |
455 | ||
456 | *(vulp)T2_HBASE = 0x0; /* Disable HOLES. */ | |
457 | ||
458 | /* Zero HAE. */ | |
459 | *(vulp)T2_HAE_1 = 0; mb(); /* Sparse MEM HAE */ | |
460 | *(vulp)T2_HAE_2 = 0; mb(); /* Sparse I/O HAE */ | |
461 | *(vulp)T2_HAE_3 = 0; mb(); /* Config Space HAE */ | |
462 | ||
463 | /* | |
464 | * We also now zero out HAE_4, the dense memory HAE, so that | |
465 | * we need not account for its "offset" when accessing dense | |
466 | * memory resources which we allocated in our normal way. This | |
467 | * HAE would need to stay untouched were we to keep the SRM | |
468 | * resource settings. | |
469 | * | |
470 | * Thus we can now run standard X servers on SABLE/LYNX. :-) | |
471 | */ | |
472 | *(vulp)T2_HAE_4 = 0; mb(); | |
473 | } | |
474 | ||
475 | void | |
476 | t2_kill_arch(int mode) | |
477 | { | |
478 | /* | |
479 | * Restore the DMA Window registers. | |
480 | */ | |
481 | *(vulp)T2_WBASE1 = t2_saved_config.window[0].wbase; | |
482 | *(vulp)T2_WMASK1 = t2_saved_config.window[0].wmask; | |
483 | *(vulp)T2_TBASE1 = t2_saved_config.window[0].tbase; | |
484 | *(vulp)T2_WBASE2 = t2_saved_config.window[1].wbase; | |
485 | *(vulp)T2_WMASK2 = t2_saved_config.window[1].wmask; | |
486 | *(vulp)T2_TBASE2 = t2_saved_config.window[1].tbase; | |
487 | mb(); | |
488 | ||
489 | *(vulp)T2_HAE_1 = srm_hae; | |
490 | *(vulp)T2_HAE_2 = t2_saved_config.hae_2; | |
491 | *(vulp)T2_HAE_3 = t2_saved_config.hae_3; | |
492 | *(vulp)T2_HAE_4 = t2_saved_config.hae_4; | |
493 | *(vulp)T2_HBASE = t2_saved_config.hbase; | |
494 | mb(); | |
495 | *(vulp)T2_HBASE; /* READ it back to ensure WRITE occurred. */ | |
496 | } | |
497 | ||
498 | void | |
499 | t2_pci_tbi(struct pci_controller *hose, dma_addr_t start, dma_addr_t end) | |
500 | { | |
501 | unsigned long t2_iocsr; | |
502 | ||
503 | t2_iocsr = *(vulp)T2_IOCSR; | |
504 | ||
505 | /* set the TLB Clear bit */ | |
506 | *(vulp)T2_IOCSR = t2_iocsr | (0x1UL << 28); | |
507 | mb(); | |
508 | *(vulp)T2_IOCSR; /* read it back to make sure */ | |
509 | ||
510 | /* clear the TLB Clear bit */ | |
511 | *(vulp)T2_IOCSR = t2_iocsr & ~(0x1UL << 28); | |
512 | mb(); | |
513 | *(vulp)T2_IOCSR; /* read it back to make sure */ | |
514 | } | |
515 | ||
516 | #define SIC_SEIC (1UL << 33) /* System Event Clear */ | |
517 | ||
518 | static void | |
519 | t2_clear_errors(int cpu) | |
520 | { | |
521 | struct sable_cpu_csr *cpu_regs; | |
522 | ||
523 | cpu_regs = (struct sable_cpu_csr *)T2_CPUn_BASE(cpu); | |
524 | ||
525 | cpu_regs->sic &= ~SIC_SEIC; | |
526 | ||
527 | /* Clear CPU errors. */ | |
528 | cpu_regs->bcce |= cpu_regs->bcce; | |
529 | cpu_regs->cbe |= cpu_regs->cbe; | |
530 | cpu_regs->bcue |= cpu_regs->bcue; | |
531 | cpu_regs->dter |= cpu_regs->dter; | |
532 | ||
533 | *(vulp)T2_CERR1 |= *(vulp)T2_CERR1; | |
534 | *(vulp)T2_PERR1 |= *(vulp)T2_PERR1; | |
535 | ||
536 | mb(); | |
537 | mb(); /* magic */ | |
538 | } | |
539 | ||
540 | /* | |
541 | * SABLE seems to have a "broadcast" style machine check, in that all | |
542 | * CPUs receive it. And, the issuing CPU, in the case of PCI Config | |
543 | * space read/write faults, will also receive a second mcheck, upon | |
544 | * lowering IPL during completion processing in pci_read_config_byte() | |
545 | * et al. | |
546 | * | |
547 | * Hence all the taken/expected/any_expected/last_taken stuff... | |
548 | */ | |
549 | void | |
4fa1970a | 550 | t2_machine_check(unsigned long vector, unsigned long la_ptr) |
1da177e4 LT |
551 | { |
552 | int cpu = smp_processor_id(); | |
553 | #ifdef CONFIG_VERBOSE_MCHECK | |
554 | struct el_common *mchk_header = (struct el_common *)la_ptr; | |
555 | #endif | |
556 | ||
557 | /* Clear the error before any reporting. */ | |
558 | mb(); | |
559 | mb(); /* magic */ | |
560 | draina(); | |
561 | t2_clear_errors(cpu); | |
562 | ||
563 | /* This should not actually be done until the logout frame is | |
564 | examined, but, since we don't do that, go on and do this... */ | |
565 | wrmces(0x7); | |
566 | mb(); | |
567 | ||
568 | /* Now, do testing for the anomalous conditions. */ | |
569 | if (!mcheck_expected(cpu) && t2_mcheck_any_expected) { | |
570 | /* | |
571 | * FUNKY: Received mcheck on a CPU and not | |
572 | * expecting it, but another CPU is expecting one. | |
573 | * | |
574 | * Just dismiss it for now on this CPU... | |
575 | */ | |
576 | #ifdef CONFIG_VERBOSE_MCHECK | |
577 | if (alpha_verbose_mcheck > 1) { | |
578 | printk("t2_machine_check(cpu%d): any_expected 0x%x -" | |
579 | " (assumed) spurious -" | |
580 | " code 0x%x\n", cpu, t2_mcheck_any_expected, | |
581 | (unsigned int)mchk_header->code); | |
582 | } | |
583 | #endif | |
584 | return; | |
585 | } | |
586 | ||
587 | if (!mcheck_expected(cpu) && !t2_mcheck_any_expected) { | |
588 | if (t2_mcheck_last_taken & (1 << cpu)) { | |
589 | #ifdef CONFIG_VERBOSE_MCHECK | |
590 | if (alpha_verbose_mcheck > 1) { | |
591 | printk("t2_machine_check(cpu%d): last_taken 0x%x - " | |
592 | "unexpected mcheck - code 0x%x\n", | |
593 | cpu, t2_mcheck_last_taken, | |
594 | (unsigned int)mchk_header->code); | |
595 | } | |
596 | #endif | |
597 | t2_mcheck_last_taken = 0; | |
598 | mb(); | |
599 | return; | |
600 | } else { | |
601 | t2_mcheck_last_taken = 0; | |
602 | mb(); | |
603 | } | |
604 | } | |
605 | ||
606 | #ifdef CONFIG_VERBOSE_MCHECK | |
607 | if (alpha_verbose_mcheck > 1) { | |
608 | printk("%s t2_mcheck(cpu%d): last_taken 0x%x - " | |
609 | "any_expected 0x%x - code 0x%x\n", | |
610 | (mcheck_expected(cpu) ? "EX" : "UN"), cpu, | |
611 | t2_mcheck_last_taken, t2_mcheck_any_expected, | |
612 | (unsigned int)mchk_header->code); | |
613 | } | |
614 | #endif | |
615 | ||
4fa1970a | 616 | process_mcheck_info(vector, la_ptr, "T2", mcheck_expected(cpu)); |
1da177e4 | 617 | } |