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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 | #include <asm/mce.h> | |
25 | ||
26 | #include "proto.h" | |
27 | #include "pci_impl.h" | |
28 | ||
29 | /* For dumping initial DMA window settings. */ | |
30 | #define DEBUG_PRINT_INITIAL_SETTINGS 0 | |
31 | ||
32 | /* For dumping final DMA window settings. */ | |
33 | #define DEBUG_PRINT_FINAL_SETTINGS 0 | |
34 | ||
35 | /* | |
36 | * By default, we direct-map starting at 2GB, in order to allow the | |
37 | * maximum size direct-map window (2GB) to match the maximum amount of | |
38 | * memory (2GB) that can be present on SABLEs. But that limits the | |
39 | * floppy to DMA only via the scatter/gather window set up for 8MB | |
40 | * ISA DMA, since the maximum ISA DMA address is 2GB-1. | |
41 | * | |
42 | * For now, this seems a reasonable trade-off: even though most SABLEs | |
43 | * have less than 1GB of memory, floppy usage/performance will not | |
44 | * really be affected by forcing it to go via scatter/gather... | |
45 | */ | |
46 | #define T2_DIRECTMAP_2G 1 | |
47 | ||
48 | #if T2_DIRECTMAP_2G | |
49 | # define T2_DIRECTMAP_START 0x80000000UL | |
50 | # define T2_DIRECTMAP_LENGTH 0x80000000UL | |
51 | #else | |
52 | # define T2_DIRECTMAP_START 0x40000000UL | |
53 | # define T2_DIRECTMAP_LENGTH 0x40000000UL | |
54 | #endif | |
55 | ||
56 | /* The ISA scatter/gather window settings. */ | |
57 | #define T2_ISA_SG_START 0x00800000UL | |
58 | #define T2_ISA_SG_LENGTH 0x00800000UL | |
59 | ||
60 | /* | |
61 | * NOTE: Herein lie back-to-back mb instructions. They are magic. | |
62 | * One plausible explanation is that the i/o controller does not properly | |
63 | * handle the system transaction. Another involves timing. Ho hum. | |
64 | */ | |
65 | ||
66 | /* | |
67 | * BIOS32-style PCI interface: | |
68 | */ | |
69 | ||
70 | #define DEBUG_CONFIG 0 | |
71 | ||
72 | #if DEBUG_CONFIG | |
73 | # define DBG(args) printk args | |
74 | #else | |
75 | # define DBG(args) | |
76 | #endif | |
77 | ||
78 | static volatile unsigned int t2_mcheck_any_expected; | |
79 | static volatile unsigned int t2_mcheck_last_taken; | |
80 | ||
81 | /* Place to save the DMA Window registers as set up by SRM | |
82 | for restoration during shutdown. */ | |
83 | static struct | |
84 | { | |
85 | struct { | |
86 | unsigned long wbase; | |
87 | unsigned long wmask; | |
88 | unsigned long tbase; | |
89 | } window[2]; | |
90 | unsigned long hae_1; | |
91 | unsigned long hae_2; | |
92 | unsigned long hae_3; | |
93 | unsigned long hae_4; | |
94 | unsigned long hbase; | |
95 | } t2_saved_config __attribute((common)); | |
96 | ||
97 | /* | |
98 | * Given a bus, device, and function number, compute resulting | |
99 | * configuration space address and setup the T2_HAXR2 register | |
100 | * accordingly. It is therefore not safe to have concurrent | |
101 | * invocations to configuration space access routines, but there | |
102 | * really shouldn't be any need for this. | |
103 | * | |
104 | * Type 0: | |
105 | * | |
106 | * 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1 | |
107 | * 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 | |
108 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
109 | * | | |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| | |
110 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
111 | * | |
112 | * 31:11 Device select bit. | |
113 | * 10:8 Function number | |
114 | * 7:2 Register number | |
115 | * | |
116 | * Type 1: | |
117 | * | |
118 | * 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1 | |
119 | * 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 | |
120 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
121 | * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1| | |
122 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
123 | * | |
124 | * 31:24 reserved | |
125 | * 23:16 bus number (8 bits = 128 possible buses) | |
126 | * 15:11 Device number (5 bits) | |
127 | * 10:8 function number | |
128 | * 7:2 register number | |
129 | * | |
130 | * Notes: | |
131 | * The function number selects which function of a multi-function device | |
132 | * (e.g., SCSI and Ethernet). | |
133 | * | |
134 | * The register selects a DWORD (32 bit) register offset. Hence it | |
135 | * doesn't get shifted by 2 bits as we want to "drop" the bottom two | |
136 | * bits. | |
137 | */ | |
138 | ||
139 | static int | |
140 | mk_conf_addr(struct pci_bus *pbus, unsigned int device_fn, int where, | |
141 | unsigned long *pci_addr, unsigned char *type1) | |
142 | { | |
143 | unsigned long addr; | |
144 | u8 bus = pbus->number; | |
145 | ||
146 | DBG(("mk_conf_addr(bus=%d, dfn=0x%x, where=0x%x," | |
147 | " addr=0x%lx, type1=0x%x)\n", | |
148 | bus, device_fn, where, pci_addr, type1)); | |
149 | ||
150 | if (bus == 0) { | |
151 | int device = device_fn >> 3; | |
152 | ||
153 | /* Type 0 configuration cycle. */ | |
154 | ||
155 | if (device > 8) { | |
156 | DBG(("mk_conf_addr: device (%d)>20, returning -1\n", | |
157 | device)); | |
158 | return -1; | |
159 | } | |
160 | ||
161 | *type1 = 0; | |
162 | addr = (0x0800L << device) | ((device_fn & 7) << 8) | (where); | |
163 | } else { | |
164 | /* Type 1 configuration cycle. */ | |
165 | *type1 = 1; | |
166 | addr = (bus << 16) | (device_fn << 8) | (where); | |
167 | } | |
168 | *pci_addr = addr; | |
169 | DBG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr)); | |
170 | return 0; | |
171 | } | |
172 | ||
173 | /* | |
174 | * NOTE: both conf_read() and conf_write() may set HAE_3 when needing | |
175 | * to do type1 access. This is protected by the use of spinlock IRQ | |
176 | * primitives in the wrapper functions pci_{read,write}_config_*() | |
177 | * defined in drivers/pci/pci.c. | |
178 | */ | |
179 | static unsigned int | |
180 | conf_read(unsigned long addr, unsigned char type1) | |
181 | { | |
182 | unsigned int value, cpu, taken; | |
183 | unsigned long t2_cfg = 0; | |
184 | ||
185 | cpu = smp_processor_id(); | |
186 | ||
187 | DBG(("conf_read(addr=0x%lx, type1=%d)\n", addr, type1)); | |
188 | ||
189 | /* If Type1 access, must set T2 CFG. */ | |
190 | if (type1) { | |
191 | t2_cfg = *(vulp)T2_HAE_3 & ~0xc0000000UL; | |
192 | *(vulp)T2_HAE_3 = 0x40000000UL | t2_cfg; | |
193 | mb(); | |
194 | } | |
195 | mb(); | |
196 | draina(); | |
197 | ||
198 | mcheck_expected(cpu) = 1; | |
199 | mcheck_taken(cpu) = 0; | |
200 | t2_mcheck_any_expected |= (1 << cpu); | |
201 | mb(); | |
202 | ||
203 | /* Access configuration space. */ | |
204 | value = *(vuip)addr; | |
205 | mb(); | |
206 | mb(); /* magic */ | |
207 | ||
208 | /* Wait for possible mcheck. Also, this lets other CPUs clear | |
209 | their mchecks as well, as they can reliably tell when | |
210 | another CPU is in the midst of handling a real mcheck via | |
211 | the "taken" function. */ | |
212 | udelay(100); | |
213 | ||
214 | if ((taken = mcheck_taken(cpu))) { | |
215 | mcheck_taken(cpu) = 0; | |
216 | t2_mcheck_last_taken |= (1 << cpu); | |
217 | value = 0xffffffffU; | |
218 | mb(); | |
219 | } | |
220 | mcheck_expected(cpu) = 0; | |
221 | t2_mcheck_any_expected = 0; | |
222 | mb(); | |
223 | ||
224 | /* If Type1 access, must reset T2 CFG so normal IO space ops work. */ | |
225 | if (type1) { | |
226 | *(vulp)T2_HAE_3 = t2_cfg; | |
227 | mb(); | |
228 | } | |
229 | ||
230 | return value; | |
231 | } | |
232 | ||
233 | static void | |
234 | conf_write(unsigned long addr, unsigned int value, unsigned char type1) | |
235 | { | |
236 | unsigned int cpu, taken; | |
237 | unsigned long t2_cfg = 0; | |
238 | ||
239 | cpu = smp_processor_id(); | |
240 | ||
241 | /* If Type1 access, must set T2 CFG. */ | |
242 | if (type1) { | |
243 | t2_cfg = *(vulp)T2_HAE_3 & ~0xc0000000UL; | |
244 | *(vulp)T2_HAE_3 = t2_cfg | 0x40000000UL; | |
245 | mb(); | |
246 | } | |
247 | mb(); | |
248 | draina(); | |
249 | ||
250 | mcheck_expected(cpu) = 1; | |
251 | mcheck_taken(cpu) = 0; | |
252 | t2_mcheck_any_expected |= (1 << cpu); | |
253 | mb(); | |
254 | ||
255 | /* Access configuration space. */ | |
256 | *(vuip)addr = value; | |
257 | mb(); | |
258 | mb(); /* magic */ | |
259 | ||
260 | /* Wait for possible mcheck. Also, this lets other CPUs clear | |
261 | their mchecks as well, as they can reliably tell when | |
262 | this CPU is in the midst of handling a real mcheck via | |
263 | the "taken" function. */ | |
264 | udelay(100); | |
265 | ||
266 | if ((taken = mcheck_taken(cpu))) { | |
267 | mcheck_taken(cpu) = 0; | |
268 | t2_mcheck_last_taken |= (1 << cpu); | |
269 | mb(); | |
270 | } | |
271 | mcheck_expected(cpu) = 0; | |
272 | t2_mcheck_any_expected = 0; | |
273 | mb(); | |
274 | ||
275 | /* If Type1 access, must reset T2 CFG so normal IO space ops work. */ | |
276 | if (type1) { | |
277 | *(vulp)T2_HAE_3 = t2_cfg; | |
278 | mb(); | |
279 | } | |
280 | } | |
281 | ||
282 | static int | |
283 | t2_read_config(struct pci_bus *bus, unsigned int devfn, int where, | |
284 | int size, u32 *value) | |
285 | { | |
286 | unsigned long addr, pci_addr; | |
287 | unsigned char type1; | |
288 | int shift; | |
289 | long mask; | |
290 | ||
291 | if (mk_conf_addr(bus, devfn, where, &pci_addr, &type1)) | |
292 | return PCIBIOS_DEVICE_NOT_FOUND; | |
293 | ||
294 | mask = (size - 1) * 8; | |
295 | shift = (where & 3) * 8; | |
296 | addr = (pci_addr << 5) + mask + T2_CONF; | |
297 | *value = conf_read(addr, type1) >> (shift); | |
298 | return PCIBIOS_SUCCESSFUL; | |
299 | } | |
300 | ||
301 | static int | |
302 | t2_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size, | |
303 | u32 value) | |
304 | { | |
305 | unsigned long addr, pci_addr; | |
306 | unsigned char type1; | |
307 | long mask; | |
308 | ||
309 | if (mk_conf_addr(bus, devfn, where, &pci_addr, &type1)) | |
310 | return PCIBIOS_DEVICE_NOT_FOUND; | |
311 | ||
312 | mask = (size - 1) * 8; | |
313 | addr = (pci_addr << 5) + mask + T2_CONF; | |
314 | conf_write(addr, value << ((where & 3) * 8), type1); | |
315 | return PCIBIOS_SUCCESSFUL; | |
316 | } | |
317 | ||
318 | struct pci_ops t2_pci_ops = | |
319 | { | |
320 | .read = t2_read_config, | |
321 | .write = t2_write_config, | |
322 | }; | |
323 | \f | |
324 | static void __init | |
325 | t2_direct_map_window1(unsigned long base, unsigned long length) | |
326 | { | |
327 | unsigned long temp; | |
328 | ||
329 | __direct_map_base = base; | |
330 | __direct_map_size = length; | |
331 | ||
332 | temp = (base & 0xfff00000UL) | ((base + length - 1) >> 20); | |
333 | *(vulp)T2_WBASE1 = temp | 0x80000UL; /* OR in ENABLE bit */ | |
334 | temp = (length - 1) & 0xfff00000UL; | |
335 | *(vulp)T2_WMASK1 = temp; | |
336 | *(vulp)T2_TBASE1 = 0; | |
337 | ||
338 | #if DEBUG_PRINT_FINAL_SETTINGS | |
339 | printk("%s: setting WBASE1=0x%lx WMASK1=0x%lx TBASE1=0x%lx\n", | |
340 | __func__, *(vulp)T2_WBASE1, *(vulp)T2_WMASK1, *(vulp)T2_TBASE1); | |
341 | #endif | |
342 | } | |
343 | ||
344 | static void __init | |
345 | t2_sg_map_window2(struct pci_controller *hose, | |
346 | unsigned long base, | |
347 | unsigned long length) | |
348 | { | |
349 | unsigned long temp; | |
350 | ||
351 | /* Note we can only do 1 SG window, as the other is for direct, so | |
352 | do an ISA SG area, especially for the floppy. */ | |
353 | hose->sg_isa = iommu_arena_new(hose, base, length, 0); | |
354 | hose->sg_pci = NULL; | |
355 | ||
356 | temp = (base & 0xfff00000UL) | ((base + length - 1) >> 20); | |
357 | *(vulp)T2_WBASE2 = temp | 0xc0000UL; /* OR in ENABLE/SG bits */ | |
358 | temp = (length - 1) & 0xfff00000UL; | |
359 | *(vulp)T2_WMASK2 = temp; | |
360 | *(vulp)T2_TBASE2 = virt_to_phys(hose->sg_isa->ptes) >> 1; | |
361 | mb(); | |
362 | ||
363 | t2_pci_tbi(hose, 0, -1); /* flush TLB all */ | |
364 | ||
365 | #if DEBUG_PRINT_FINAL_SETTINGS | |
366 | printk("%s: setting WBASE2=0x%lx WMASK2=0x%lx TBASE2=0x%lx\n", | |
367 | __func__, *(vulp)T2_WBASE2, *(vulp)T2_WMASK2, *(vulp)T2_TBASE2); | |
368 | #endif | |
369 | } | |
370 | ||
371 | static void __init | |
372 | t2_save_configuration(void) | |
373 | { | |
374 | #if DEBUG_PRINT_INITIAL_SETTINGS | |
375 | printk("%s: HAE_1 was 0x%lx\n", __func__, srm_hae); /* HW is 0 */ | |
376 | printk("%s: HAE_2 was 0x%lx\n", __func__, *(vulp)T2_HAE_2); | |
377 | printk("%s: HAE_3 was 0x%lx\n", __func__, *(vulp)T2_HAE_3); | |
378 | printk("%s: HAE_4 was 0x%lx\n", __func__, *(vulp)T2_HAE_4); | |
379 | printk("%s: HBASE was 0x%lx\n", __func__, *(vulp)T2_HBASE); | |
380 | ||
381 | printk("%s: WBASE1=0x%lx WMASK1=0x%lx TBASE1=0x%lx\n", __func__, | |
382 | *(vulp)T2_WBASE1, *(vulp)T2_WMASK1, *(vulp)T2_TBASE1); | |
383 | printk("%s: WBASE2=0x%lx WMASK2=0x%lx TBASE2=0x%lx\n", __func__, | |
384 | *(vulp)T2_WBASE2, *(vulp)T2_WMASK2, *(vulp)T2_TBASE2); | |
385 | #endif | |
386 | ||
387 | /* | |
388 | * Save the DMA Window registers. | |
389 | */ | |
390 | t2_saved_config.window[0].wbase = *(vulp)T2_WBASE1; | |
391 | t2_saved_config.window[0].wmask = *(vulp)T2_WMASK1; | |
392 | t2_saved_config.window[0].tbase = *(vulp)T2_TBASE1; | |
393 | t2_saved_config.window[1].wbase = *(vulp)T2_WBASE2; | |
394 | t2_saved_config.window[1].wmask = *(vulp)T2_WMASK2; | |
395 | t2_saved_config.window[1].tbase = *(vulp)T2_TBASE2; | |
396 | ||
397 | t2_saved_config.hae_1 = srm_hae; /* HW is already set to 0 */ | |
398 | t2_saved_config.hae_2 = *(vulp)T2_HAE_2; | |
399 | t2_saved_config.hae_3 = *(vulp)T2_HAE_3; | |
400 | t2_saved_config.hae_4 = *(vulp)T2_HAE_4; | |
401 | t2_saved_config.hbase = *(vulp)T2_HBASE; | |
402 | } | |
403 | ||
404 | void __init | |
405 | t2_init_arch(void) | |
406 | { | |
407 | struct pci_controller *hose; | |
408 | struct resource *hae_mem; | |
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 | hae_mem = alloc_resource(); | |
437 | hae_mem->start = 0; | |
438 | hae_mem->end = T2_MEM_R1_MASK; | |
439 | hae_mem->name = pci_hae0_name; | |
440 | if (request_resource(&iomem_resource, hae_mem) < 0) | |
441 | printk(KERN_ERR "Failed to request HAE_MEM\n"); | |
442 | hose->mem_space = hae_mem; | |
443 | hose->index = 0; | |
444 | ||
445 | hose->sparse_mem_base = T2_SPARSE_MEM - IDENT_ADDR; | |
446 | hose->dense_mem_base = T2_DENSE_MEM - IDENT_ADDR; | |
447 | hose->sparse_io_base = T2_IO - IDENT_ADDR; | |
448 | hose->dense_io_base = 0; | |
449 | ||
450 | /* | |
451 | * Set up the PCI->physical memory translation windows. | |
452 | * | |
453 | * Window 1 is direct mapped. | |
454 | * Window 2 is scatter/gather (for ISA). | |
455 | */ | |
456 | ||
457 | t2_direct_map_window1(T2_DIRECTMAP_START, T2_DIRECTMAP_LENGTH); | |
458 | ||
459 | /* Always make an ISA DMA window. */ | |
460 | t2_sg_map_window2(hose, T2_ISA_SG_START, T2_ISA_SG_LENGTH); | |
461 | ||
462 | *(vulp)T2_HBASE = 0x0; /* Disable HOLES. */ | |
463 | ||
464 | /* Zero HAE. */ | |
465 | *(vulp)T2_HAE_1 = 0; mb(); /* Sparse MEM HAE */ | |
466 | *(vulp)T2_HAE_2 = 0; mb(); /* Sparse I/O HAE */ | |
467 | *(vulp)T2_HAE_3 = 0; mb(); /* Config Space HAE */ | |
468 | ||
469 | /* | |
470 | * We also now zero out HAE_4, the dense memory HAE, so that | |
471 | * we need not account for its "offset" when accessing dense | |
472 | * memory resources which we allocated in our normal way. This | |
473 | * HAE would need to stay untouched were we to keep the SRM | |
474 | * resource settings. | |
475 | * | |
476 | * Thus we can now run standard X servers on SABLE/LYNX. :-) | |
477 | */ | |
478 | *(vulp)T2_HAE_4 = 0; mb(); | |
479 | } | |
480 | ||
481 | void | |
482 | t2_kill_arch(int mode) | |
483 | { | |
484 | /* | |
485 | * Restore the DMA Window registers. | |
486 | */ | |
487 | *(vulp)T2_WBASE1 = t2_saved_config.window[0].wbase; | |
488 | *(vulp)T2_WMASK1 = t2_saved_config.window[0].wmask; | |
489 | *(vulp)T2_TBASE1 = t2_saved_config.window[0].tbase; | |
490 | *(vulp)T2_WBASE2 = t2_saved_config.window[1].wbase; | |
491 | *(vulp)T2_WMASK2 = t2_saved_config.window[1].wmask; | |
492 | *(vulp)T2_TBASE2 = t2_saved_config.window[1].tbase; | |
493 | mb(); | |
494 | ||
495 | *(vulp)T2_HAE_1 = srm_hae; | |
496 | *(vulp)T2_HAE_2 = t2_saved_config.hae_2; | |
497 | *(vulp)T2_HAE_3 = t2_saved_config.hae_3; | |
498 | *(vulp)T2_HAE_4 = t2_saved_config.hae_4; | |
499 | *(vulp)T2_HBASE = t2_saved_config.hbase; | |
500 | mb(); | |
501 | *(vulp)T2_HBASE; /* READ it back to ensure WRITE occurred. */ | |
502 | } | |
503 | ||
504 | void | |
505 | t2_pci_tbi(struct pci_controller *hose, dma_addr_t start, dma_addr_t end) | |
506 | { | |
507 | unsigned long t2_iocsr; | |
508 | ||
509 | t2_iocsr = *(vulp)T2_IOCSR; | |
510 | ||
511 | /* set the TLB Clear bit */ | |
512 | *(vulp)T2_IOCSR = t2_iocsr | (0x1UL << 28); | |
513 | mb(); | |
514 | *(vulp)T2_IOCSR; /* read it back to make sure */ | |
515 | ||
516 | /* clear the TLB Clear bit */ | |
517 | *(vulp)T2_IOCSR = t2_iocsr & ~(0x1UL << 28); | |
518 | mb(); | |
519 | *(vulp)T2_IOCSR; /* read it back to make sure */ | |
520 | } | |
521 | ||
522 | #define SIC_SEIC (1UL << 33) /* System Event Clear */ | |
523 | ||
524 | static void | |
525 | t2_clear_errors(int cpu) | |
526 | { | |
527 | struct sable_cpu_csr *cpu_regs; | |
528 | ||
529 | cpu_regs = (struct sable_cpu_csr *)T2_CPUn_BASE(cpu); | |
530 | ||
531 | cpu_regs->sic &= ~SIC_SEIC; | |
532 | ||
533 | /* Clear CPU errors. */ | |
534 | cpu_regs->bcce |= cpu_regs->bcce; | |
535 | cpu_regs->cbe |= cpu_regs->cbe; | |
536 | cpu_regs->bcue |= cpu_regs->bcue; | |
537 | cpu_regs->dter |= cpu_regs->dter; | |
538 | ||
539 | *(vulp)T2_CERR1 |= *(vulp)T2_CERR1; | |
540 | *(vulp)T2_PERR1 |= *(vulp)T2_PERR1; | |
541 | ||
542 | mb(); | |
543 | mb(); /* magic */ | |
544 | } | |
545 | ||
546 | /* | |
547 | * SABLE seems to have a "broadcast" style machine check, in that all | |
548 | * CPUs receive it. And, the issuing CPU, in the case of PCI Config | |
549 | * space read/write faults, will also receive a second mcheck, upon | |
550 | * lowering IPL during completion processing in pci_read_config_byte() | |
551 | * et al. | |
552 | * | |
553 | * Hence all the taken/expected/any_expected/last_taken stuff... | |
554 | */ | |
555 | void | |
556 | t2_machine_check(unsigned long vector, unsigned long la_ptr) | |
557 | { | |
558 | int cpu = smp_processor_id(); | |
559 | #ifdef CONFIG_VERBOSE_MCHECK | |
560 | struct el_common *mchk_header = (struct el_common *)la_ptr; | |
561 | #endif | |
562 | ||
563 | /* Clear the error before any reporting. */ | |
564 | mb(); | |
565 | mb(); /* magic */ | |
566 | draina(); | |
567 | t2_clear_errors(cpu); | |
568 | ||
569 | /* This should not actually be done until the logout frame is | |
570 | examined, but, since we don't do that, go on and do this... */ | |
571 | wrmces(0x7); | |
572 | mb(); | |
573 | ||
574 | /* Now, do testing for the anomalous conditions. */ | |
575 | if (!mcheck_expected(cpu) && t2_mcheck_any_expected) { | |
576 | /* | |
577 | * FUNKY: Received mcheck on a CPU and not | |
578 | * expecting it, but another CPU is expecting one. | |
579 | * | |
580 | * Just dismiss it for now on this CPU... | |
581 | */ | |
582 | #ifdef CONFIG_VERBOSE_MCHECK | |
583 | if (alpha_verbose_mcheck > 1) { | |
584 | printk("t2_machine_check(cpu%d): any_expected 0x%x -" | |
585 | " (assumed) spurious -" | |
586 | " code 0x%x\n", cpu, t2_mcheck_any_expected, | |
587 | (unsigned int)mchk_header->code); | |
588 | } | |
589 | #endif | |
590 | return; | |
591 | } | |
592 | ||
593 | if (!mcheck_expected(cpu) && !t2_mcheck_any_expected) { | |
594 | if (t2_mcheck_last_taken & (1 << cpu)) { | |
595 | #ifdef CONFIG_VERBOSE_MCHECK | |
596 | if (alpha_verbose_mcheck > 1) { | |
597 | printk("t2_machine_check(cpu%d): last_taken 0x%x - " | |
598 | "unexpected mcheck - code 0x%x\n", | |
599 | cpu, t2_mcheck_last_taken, | |
600 | (unsigned int)mchk_header->code); | |
601 | } | |
602 | #endif | |
603 | t2_mcheck_last_taken = 0; | |
604 | mb(); | |
605 | return; | |
606 | } else { | |
607 | t2_mcheck_last_taken = 0; | |
608 | mb(); | |
609 | } | |
610 | } | |
611 | ||
612 | #ifdef CONFIG_VERBOSE_MCHECK | |
613 | if (alpha_verbose_mcheck > 1) { | |
614 | printk("%s t2_mcheck(cpu%d): last_taken 0x%x - " | |
615 | "any_expected 0x%x - code 0x%x\n", | |
616 | (mcheck_expected(cpu) ? "EX" : "UN"), cpu, | |
617 | t2_mcheck_last_taken, t2_mcheck_any_expected, | |
618 | (unsigned int)mchk_header->code); | |
619 | } | |
620 | #endif | |
621 | ||
622 | process_mcheck_info(vector, la_ptr, "T2", mcheck_expected(cpu)); | |
623 | } |