?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
tools, slub: Fix off-by-one buffer corruption after readlink() call
[linux-2.6/linux-mips.git] / arch / sparc / kernel / chmc.c
blob5f450260981dd3f564db36387b8e80b817b36986
1 /* chmc.c: Driver for UltraSPARC-III memory controller.
2 *
3 * Copyright (C) 2001, 2007, 2008 David S. Miller (davem@davemloft.net)
4 */
5
6 #include <linux/module.h>
7 #include <linux/kernel.h>
8 #include <linux/types.h>
9 #include <linux/slab.h>
10 #include <linux/list.h>
11 #include <linux/string.h>
12 #include <linux/sched.h>
13 #include <linux/smp.h>
14 #include <linux/errno.h>
15 #include <linux/init.h>
16 #include <linux/of.h>
17 #include <linux/of_device.h>
18 #include <asm/spitfire.h>
19 #include <asm/chmctrl.h>
20 #include <asm/cpudata.h>
21 #include <asm/oplib.h>
22 #include <asm/prom.h>
23 #include <asm/head.h>
24 #include <asm/io.h>
25 #include <asm/memctrl.h>
26
27 #define DRV_MODULE_NAME "chmc"
28 #define PFX DRV_MODULE_NAME ": "
29 #define DRV_MODULE_VERSION "0.2"
30
31 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
32 MODULE_DESCRIPTION("UltraSPARC-III memory controller driver");
33 MODULE_LICENSE("GPL");
34 MODULE_VERSION(DRV_MODULE_VERSION);
35
36 static int mc_type;
37 #define MC_TYPE_SAFARI 1
38 #define MC_TYPE_JBUS 2
39
40 static dimm_printer_t us3mc_dimm_printer;
41
42 #define CHMCTRL_NDGRPS 2
43 #define CHMCTRL_NDIMMS 4
44
45 #define CHMC_DIMMS_PER_MC (CHMCTRL_NDGRPS * CHMCTRL_NDIMMS)
46
47 /* OBP memory-layout property format. */
48 struct chmc_obp_map {
49 unsigned char dimm_map[144];
50 unsigned char pin_map[576];
51 };
52
53 #define DIMM_LABEL_SZ 8
54
55 struct chmc_obp_mem_layout {
56 /* One max 8-byte string label per DIMM. Usually
57 * this matches the label on the motherboard where
58 * that DIMM resides.
59 */
60 char dimm_labels[CHMC_DIMMS_PER_MC][DIMM_LABEL_SZ];
61
62 /* If symmetric use map[0], else it is
63 * asymmetric and map[1] should be used.
64 */
65 char symmetric;
66
67 struct chmc_obp_map map[2];
68 };
69
70 #define CHMCTRL_NBANKS 4
71
72 struct chmc_bank_info {
73 struct chmc *p;
74 int bank_id;
75
76 u64 raw_reg;
77 int valid;
78 int uk;
79 int um;
80 int lk;
81 int lm;
82 int interleave;
83 unsigned long base;
84 unsigned long size;
85 };
86
87 struct chmc {
88 struct list_head list;
89 int portid;
90
91 struct chmc_obp_mem_layout layout_prop;
92 int layout_size;
93
94 void __iomem *regs;
95
96 u64 timing_control1;
97 u64 timing_control2;
98 u64 timing_control3;
99 u64 timing_control4;
100 u64 memaddr_control;
101
102 struct chmc_bank_info logical_banks[CHMCTRL_NBANKS];
103 };
104
105 #define JBUSMC_REGS_SIZE 8
106
107 #define JB_MC_REG1_DIMM2_BANK3 0x8000000000000000UL
108 #define JB_MC_REG1_DIMM1_BANK1 0x4000000000000000UL
109 #define JB_MC_REG1_DIMM2_BANK2 0x2000000000000000UL
110 #define JB_MC_REG1_DIMM1_BANK0 0x1000000000000000UL
111 #define JB_MC_REG1_XOR 0x0000010000000000UL
112 #define JB_MC_REG1_ADDR_GEN_2 0x000000e000000000UL
113 #define JB_MC_REG1_ADDR_GEN_2_SHIFT 37
114 #define JB_MC_REG1_ADDR_GEN_1 0x0000001c00000000UL
115 #define JB_MC_REG1_ADDR_GEN_1_SHIFT 34
116 #define JB_MC_REG1_INTERLEAVE 0x0000000001800000UL
117 #define JB_MC_REG1_INTERLEAVE_SHIFT 23
118 #define JB_MC_REG1_DIMM2_PTYPE 0x0000000000200000UL
119 #define JB_MC_REG1_DIMM2_PTYPE_SHIFT 21
120 #define JB_MC_REG1_DIMM1_PTYPE 0x0000000000100000UL
121 #define JB_MC_REG1_DIMM1_PTYPE_SHIFT 20
122
123 #define PART_TYPE_X8 0
124 #define PART_TYPE_X4 1
125
126 #define INTERLEAVE_NONE 0
127 #define INTERLEAVE_SAME 1
128 #define INTERLEAVE_INTERNAL 2
129 #define INTERLEAVE_BOTH 3
130
131 #define ADDR_GEN_128MB 0
132 #define ADDR_GEN_256MB 1
133 #define ADDR_GEN_512MB 2
134 #define ADDR_GEN_1GB 3
135
136 #define JB_NUM_DIMM_GROUPS 2
137 #define JB_NUM_DIMMS_PER_GROUP 2
138 #define JB_NUM_DIMMS (JB_NUM_DIMM_GROUPS * JB_NUM_DIMMS_PER_GROUP)
139
140 struct jbusmc_obp_map {
141 unsigned char dimm_map[18];
142 unsigned char pin_map[144];
143 };
144
145 struct jbusmc_obp_mem_layout {
146 /* One max 8-byte string label per DIMM. Usually
147 * this matches the label on the motherboard where
148 * that DIMM resides.
149 */
150 char dimm_labels[JB_NUM_DIMMS][DIMM_LABEL_SZ];
151
152 /* If symmetric use map[0], else it is
153 * asymmetric and map[1] should be used.
154 */
155 char symmetric;
156
157 struct jbusmc_obp_map map;
158
159 char _pad;
160 };
161
162 struct jbusmc_dimm_group {
163 struct jbusmc *controller;
164 int index;
165 u64 base_addr;
166 u64 size;
167 };
168
169 struct jbusmc {
170 void __iomem *regs;
171 u64 mc_reg_1;
172 u32 portid;
173 struct jbusmc_obp_mem_layout layout;
174 int layout_len;
175 int num_dimm_groups;
176 struct jbusmc_dimm_group dimm_groups[JB_NUM_DIMM_GROUPS];
177 struct list_head list;
178 };
179
180 static DEFINE_SPINLOCK(mctrl_list_lock);
181 static LIST_HEAD(mctrl_list);
182
183 static void mc_list_add(struct list_head *list)
184 {
185 spin_lock(&mctrl_list_lock);
186 list_add(list, &mctrl_list);
187 spin_unlock(&mctrl_list_lock);
188 }
189
190 static void mc_list_del(struct list_head *list)
191 {
192 spin_lock(&mctrl_list_lock);
193 list_del_init(list);
194 spin_unlock(&mctrl_list_lock);
195 }
196
197 #define SYNDROME_MIN -1
198 #define SYNDROME_MAX 144
199
200 /* Covert syndrome code into the way the bits are positioned
201 * on the bus.
202 */
203 static int syndrome_to_qword_code(int syndrome_code)
204 {
205 if (syndrome_code < 128)
206 syndrome_code += 16;
207 else if (syndrome_code < 128 + 9)
208 syndrome_code -= (128 - 7);
209 else if (syndrome_code < (128 + 9 + 3))
210 syndrome_code -= (128 + 9 - 4);
211 else
212 syndrome_code -= (128 + 9 + 3);
213 return syndrome_code;
214 }
215
216 /* All this magic has to do with how a cache line comes over the wire
217 * on Safari and JBUS. A 64-bit line comes over in 1 or more quadword
218 * cycles, each of which transmit ECC/MTAG info as well as the actual
219 * data.
220 */
221 #define L2_LINE_SIZE 64
222 #define L2_LINE_ADDR_MSK (L2_LINE_SIZE - 1)
223 #define QW_PER_LINE 4
224 #define QW_BYTES (L2_LINE_SIZE / QW_PER_LINE)
225 #define QW_BITS 144
226 #define SAFARI_LAST_BIT (576 - 1)
227 #define JBUS_LAST_BIT (144 - 1)
228
229 static void get_pin_and_dimm_str(int syndrome_code, unsigned long paddr,
230 int *pin_p, char **dimm_str_p, void *_prop,
231 int base_dimm_offset)
232 {
233 int qword_code = syndrome_to_qword_code(syndrome_code);
234 int cache_line_offset;
235 int offset_inverse;
236 int dimm_map_index;
237 int map_val;
238
239 if (mc_type == MC_TYPE_JBUS) {
240 struct jbusmc_obp_mem_layout *p = _prop;
241
242 /* JBUS */
243 cache_line_offset = qword_code;
244 offset_inverse = (JBUS_LAST_BIT - cache_line_offset);
245 dimm_map_index = offset_inverse / 8;
246 map_val = p->map.dimm_map[dimm_map_index];
247 map_val = ((map_val >> ((7 - (offset_inverse & 7)))) & 1);
248 *dimm_str_p = p->dimm_labels[base_dimm_offset + map_val];
249 *pin_p = p->map.pin_map[cache_line_offset];
250 } else {
251 struct chmc_obp_mem_layout *p = _prop;
252 struct chmc_obp_map *mp;
253 int qword;
254
255 /* Safari */
256 if (p->symmetric)
257 mp = &p->map[0];
258 else
259 mp = &p->map[1];
260
261 qword = (paddr & L2_LINE_ADDR_MSK) / QW_BYTES;
262 cache_line_offset = ((3 - qword) * QW_BITS) + qword_code;
263 offset_inverse = (SAFARI_LAST_BIT - cache_line_offset);
264 dimm_map_index = offset_inverse >> 2;
265 map_val = mp->dimm_map[dimm_map_index];
266 map_val = ((map_val >> ((3 - (offset_inverse & 3)) << 1)) & 0x3);
267 *dimm_str_p = p->dimm_labels[base_dimm_offset + map_val];
268 *pin_p = mp->pin_map[cache_line_offset];
269 }
270 }
271
272 static struct jbusmc_dimm_group *jbusmc_find_dimm_group(unsigned long phys_addr)
273 {
274 struct jbusmc *p;
275
276 list_for_each_entry(p, &mctrl_list, list) {
277 int i;
278
279 for (i = 0; i < p->num_dimm_groups; i++) {
280 struct jbusmc_dimm_group *dp = &p->dimm_groups[i];
281
282 if (phys_addr < dp->base_addr ||
283 (dp->base_addr + dp->size) <= phys_addr)
284 continue;
285
286 return dp;
287 }
288 }
289 return NULL;
290 }
291
292 static int jbusmc_print_dimm(int syndrome_code,
293 unsigned long phys_addr,
294 char *buf, int buflen)
295 {
296 struct jbusmc_obp_mem_layout *prop;
297 struct jbusmc_dimm_group *dp;
298 struct jbusmc *p;
299 int first_dimm;
300
301 dp = jbusmc_find_dimm_group(phys_addr);
302 if (dp == NULL ||
303 syndrome_code < SYNDROME_MIN ||
304 syndrome_code > SYNDROME_MAX) {
305 buf[0] = '?';
306 buf[1] = '?';
307 buf[2] = '?';
308 buf[3] = '\0';
309 return 0;
310 }
311 p = dp->controller;
312 prop = &p->layout;
313
314 first_dimm = dp->index * JB_NUM_DIMMS_PER_GROUP;
315
316 if (syndrome_code != SYNDROME_MIN) {
317 char *dimm_str;
318 int pin;
319
320 get_pin_and_dimm_str(syndrome_code, phys_addr, &pin,
321 &dimm_str, prop, first_dimm);
322 sprintf(buf, "%s, pin %3d", dimm_str, pin);
323 } else {
324 int dimm;
325
326 /* Multi-bit error, we just dump out all the
327 * dimm labels associated with this dimm group.
328 */
329 for (dimm = 0; dimm < JB_NUM_DIMMS_PER_GROUP; dimm++) {
330 sprintf(buf, "%s ",
331 prop->dimm_labels[first_dimm + dimm]);
332 buf += strlen(buf);
333 }
334 }
335
336 return 0;
337 }
338
339 static u64 __devinit jbusmc_dimm_group_size(u64 base,
340 const struct linux_prom64_registers *mem_regs,
341 int num_mem_regs)
342 {
343 u64 max = base + (8UL * 1024 * 1024 * 1024);
344 u64 max_seen = base;
345 int i;
346
347 for (i = 0; i < num_mem_regs; i++) {
348 const struct linux_prom64_registers *ent;
349 u64 this_base;
350 u64 this_end;
351
352 ent = &mem_regs[i];
353 this_base = ent->phys_addr;
354 this_end = this_base + ent->reg_size;
355 if (base < this_base || base >= this_end)
356 continue;
357 if (this_end > max)
358 this_end = max;
359 if (this_end > max_seen)
360 max_seen = this_end;
361 }
362
363 return max_seen - base;
364 }
365
366 static void __devinit jbusmc_construct_one_dimm_group(struct jbusmc *p,
367 unsigned long index,
368 const struct linux_prom64_registers *mem_regs,
369 int num_mem_regs)
370 {
371 struct jbusmc_dimm_group *dp = &p->dimm_groups[index];
372
373 dp->controller = p;
374 dp->index = index;
375
376 dp->base_addr = (p->portid * (64UL * 1024 * 1024 * 1024));
377 dp->base_addr += (index * (8UL * 1024 * 1024 * 1024));
378 dp->size = jbusmc_dimm_group_size(dp->base_addr, mem_regs, num_mem_regs);
379 }
380
381 static void __devinit jbusmc_construct_dimm_groups(struct jbusmc *p,
382 const struct linux_prom64_registers *mem_regs,
383 int num_mem_regs)
384 {
385 if (p->mc_reg_1 & JB_MC_REG1_DIMM1_BANK0) {
386 jbusmc_construct_one_dimm_group(p, 0, mem_regs, num_mem_regs);
387 p->num_dimm_groups++;
388 }
389 if (p->mc_reg_1 & JB_MC_REG1_DIMM2_BANK2) {
390 jbusmc_construct_one_dimm_group(p, 1, mem_regs, num_mem_regs);
391 p->num_dimm_groups++;
392 }
393 }
394
395 static int __devinit jbusmc_probe(struct platform_device *op)
396 {
397 const struct linux_prom64_registers *mem_regs;
398 struct device_node *mem_node;
399 int err, len, num_mem_regs;
400 struct jbusmc *p;
401 const u32 *prop;
402 const void *ml;
403
404 err = -ENODEV;
405 mem_node = of_find_node_by_path("/memory");
406 if (!mem_node) {
407 printk(KERN_ERR PFX "Cannot find /memory node.\n");
408 goto out;
409 }
410 mem_regs = of_get_property(mem_node, "reg", &len);
411 if (!mem_regs) {
412 printk(KERN_ERR PFX "Cannot get reg property of /memory node.\n");
413 goto out;
414 }
415 num_mem_regs = len / sizeof(*mem_regs);
416
417 err = -ENOMEM;
418 p = kzalloc(sizeof(*p), GFP_KERNEL);
419 if (!p) {
420 printk(KERN_ERR PFX "Cannot allocate struct jbusmc.\n");
421 goto out;
422 }
423
424 INIT_LIST_HEAD(&p->list);
425
426 err = -ENODEV;
427 prop = of_get_property(op->dev.of_node, "portid", &len);
428 if (!prop || len != 4) {
429 printk(KERN_ERR PFX "Cannot find portid.\n");
430 goto out_free;
431 }
432
433 p->portid = *prop;
434
435 prop = of_get_property(op->dev.of_node, "memory-control-register-1", &len);
436 if (!prop || len != 8) {
437 printk(KERN_ERR PFX "Cannot get memory control register 1.\n");
438 goto out_free;
439 }
440
441 p->mc_reg_1 = ((u64)prop[0] << 32) | (u64) prop[1];
442
443 err = -ENOMEM;
444 p->regs = of_ioremap(&op->resource[0], 0, JBUSMC_REGS_SIZE, "jbusmc");
445 if (!p->regs) {
446 printk(KERN_ERR PFX "Cannot map jbusmc regs.\n");
447 goto out_free;
448 }
449
450 err = -ENODEV;
451 ml = of_get_property(op->dev.of_node, "memory-layout", &p->layout_len);
452 if (!ml) {
453 printk(KERN_ERR PFX "Cannot get memory layout property.\n");
454 goto out_iounmap;
455 }
456 if (p->layout_len > sizeof(p->layout)) {
457 printk(KERN_ERR PFX "Unexpected memory-layout size %d\n",
458 p->layout_len);
459 goto out_iounmap;
460 }
461 memcpy(&p->layout, ml, p->layout_len);
462
463 jbusmc_construct_dimm_groups(p, mem_regs, num_mem_regs);
464
465 mc_list_add(&p->list);
466
467 printk(KERN_INFO PFX "UltraSPARC-IIIi memory controller at %s\n",
468 op->dev.of_node->full_name);
469
470 dev_set_drvdata(&op->dev, p);
471
472 err = 0;
473
474 out:
475 return err;
476
477 out_iounmap:
478 of_iounmap(&op->resource[0], p->regs, JBUSMC_REGS_SIZE);
479
480 out_free:
481 kfree(p);
482 goto out;
483 }
484
485 /* Does BANK decode PHYS_ADDR? */
486 static int chmc_bank_match(struct chmc_bank_info *bp, unsigned long phys_addr)
487 {
488 unsigned long upper_bits = (phys_addr & PA_UPPER_BITS) >> PA_UPPER_BITS_SHIFT;
489 unsigned long lower_bits = (phys_addr & PA_LOWER_BITS) >> PA_LOWER_BITS_SHIFT;
490
491 /* Bank must be enabled to match. */
492 if (bp->valid == 0)
493 return 0;
494
495 /* Would BANK match upper bits? */
496 upper_bits ^= bp->um; /* What bits are different? */
497 upper_bits = ~upper_bits; /* Invert. */
498 upper_bits |= bp->uk; /* What bits don't matter for matching? */
499 upper_bits = ~upper_bits; /* Invert. */
500
501 if (upper_bits)
502 return 0;
503
504 /* Would BANK match lower bits? */
505 lower_bits ^= bp->lm; /* What bits are different? */
506 lower_bits = ~lower_bits; /* Invert. */
507 lower_bits |= bp->lk; /* What bits don't matter for matching? */
508 lower_bits = ~lower_bits; /* Invert. */
509
510 if (lower_bits)
511 return 0;
512
513 /* I always knew you'd be the one. */
514 return 1;
515 }
516
517 /* Given PHYS_ADDR, search memory controller banks for a match. */
518 static struct chmc_bank_info *chmc_find_bank(unsigned long phys_addr)
519 {
520 struct chmc *p;
521
522 list_for_each_entry(p, &mctrl_list, list) {
523 int bank_no;
524
525 for (bank_no = 0; bank_no < CHMCTRL_NBANKS; bank_no++) {
526 struct chmc_bank_info *bp;
527
528 bp = &p->logical_banks[bank_no];
529 if (chmc_bank_match(bp, phys_addr))
530 return bp;
531 }
532 }
533
534 return NULL;
535 }
536
537 /* This is the main purpose of this driver. */
538 static int chmc_print_dimm(int syndrome_code,
539 unsigned long phys_addr,
540 char *buf, int buflen)
541 {
542 struct chmc_bank_info *bp;
543 struct chmc_obp_mem_layout *prop;
544 int bank_in_controller, first_dimm;
545
546 bp = chmc_find_bank(phys_addr);
547 if (bp == NULL ||
548 syndrome_code < SYNDROME_MIN ||
549 syndrome_code > SYNDROME_MAX) {
550 buf[0] = '?';
551 buf[1] = '?';
552 buf[2] = '?';
553 buf[3] = '\0';
554 return 0;
555 }
556
557 prop = &bp->p->layout_prop;
558 bank_in_controller = bp->bank_id & (CHMCTRL_NBANKS - 1);
559 first_dimm = (bank_in_controller & (CHMCTRL_NDGRPS - 1));
560 first_dimm *= CHMCTRL_NDIMMS;
561
562 if (syndrome_code != SYNDROME_MIN) {
563 char *dimm_str;
564 int pin;
565
566 get_pin_and_dimm_str(syndrome_code, phys_addr, &pin,
567 &dimm_str, prop, first_dimm);
568 sprintf(buf, "%s, pin %3d", dimm_str, pin);
569 } else {
570 int dimm;
571
572 /* Multi-bit error, we just dump out all the
573 * dimm labels associated with this bank.
574 */
575 for (dimm = 0; dimm < CHMCTRL_NDIMMS; dimm++) {
576 sprintf(buf, "%s ",
577 prop->dimm_labels[first_dimm + dimm]);
578 buf += strlen(buf);
579 }
580 }
581 return 0;
582 }
583
584 /* Accessing the registers is slightly complicated. If you want
585 * to get at the memory controller which is on the same processor
586 * the code is executing, you must use special ASI load/store else
587 * you go through the global mapping.
588 */
589 static u64 chmc_read_mcreg(struct chmc *p, unsigned long offset)
590 {
591 unsigned long ret, this_cpu;
592
593 preempt_disable();
594
595 this_cpu = real_hard_smp_processor_id();
596
597 if (p->portid == this_cpu) {
598 __asm__ __volatile__("ldxa [%1] %2, %0"
599 : "=r" (ret)
600 : "r" (offset), "i" (ASI_MCU_CTRL_REG));
601 } else {
602 __asm__ __volatile__("ldxa [%1] %2, %0"
603 : "=r" (ret)
604 : "r" (p->regs + offset),
605 "i" (ASI_PHYS_BYPASS_EC_E));
606 }
607
608 preempt_enable();
609
610 return ret;
611 }
612
613 #if 0 /* currently unused */
614 static void chmc_write_mcreg(struct chmc *p, unsigned long offset, u64 val)
615 {
616 if (p->portid == smp_processor_id()) {
617 __asm__ __volatile__("stxa %0, [%1] %2"
618 : : "r" (val),
619 "r" (offset), "i" (ASI_MCU_CTRL_REG));
620 } else {
621 __asm__ __volatile__("ldxa %0, [%1] %2"
622 : : "r" (val),
623 "r" (p->regs + offset),
624 "i" (ASI_PHYS_BYPASS_EC_E));
625 }
626 }
627 #endif
628
629 static void chmc_interpret_one_decode_reg(struct chmc *p, int which_bank, u64 val)
630 {
631 struct chmc_bank_info *bp = &p->logical_banks[which_bank];
632
633 bp->p = p;
634 bp->bank_id = (CHMCTRL_NBANKS * p->portid) + which_bank;
635 bp->raw_reg = val;
636 bp->valid = (val & MEM_DECODE_VALID) >> MEM_DECODE_VALID_SHIFT;
637 bp->uk = (val & MEM_DECODE_UK) >> MEM_DECODE_UK_SHIFT;
638 bp->um = (val & MEM_DECODE_UM) >> MEM_DECODE_UM_SHIFT;
639 bp->lk = (val & MEM_DECODE_LK) >> MEM_DECODE_LK_SHIFT;
640 bp->lm = (val & MEM_DECODE_LM) >> MEM_DECODE_LM_SHIFT;
641
642 bp->base = (bp->um);
643 bp->base &= ~(bp->uk);
644 bp->base <<= PA_UPPER_BITS_SHIFT;
645
646 switch(bp->lk) {
647 case 0xf:
648 default:
649 bp->interleave = 1;
650 break;
651
652 case 0xe:
653 bp->interleave = 2;
654 break;
655
656 case 0xc:
657 bp->interleave = 4;
658 break;
659
660 case 0x8:
661 bp->interleave = 8;
662 break;
663
664 case 0x0:
665 bp->interleave = 16;
666 break;
667 }
668
669 /* UK[10] is reserved, and UK[11] is not set for the SDRAM
670 * bank size definition.
671 */
672 bp->size = (((unsigned long)bp->uk &
673 ((1UL << 10UL) - 1UL)) + 1UL) << PA_UPPER_BITS_SHIFT;
674 bp->size /= bp->interleave;
675 }
676
677 static void chmc_fetch_decode_regs(struct chmc *p)
678 {
679 if (p->layout_size == 0)
680 return;
681
682 chmc_interpret_one_decode_reg(p, 0,
683 chmc_read_mcreg(p, CHMCTRL_DECODE1));
684 chmc_interpret_one_decode_reg(p, 1,
685 chmc_read_mcreg(p, CHMCTRL_DECODE2));
686 chmc_interpret_one_decode_reg(p, 2,
687 chmc_read_mcreg(p, CHMCTRL_DECODE3));
688 chmc_interpret_one_decode_reg(p, 3,
689 chmc_read_mcreg(p, CHMCTRL_DECODE4));
690 }
691
692 static int __devinit chmc_probe(struct platform_device *op)
693 {
694 struct device_node *dp = op->dev.of_node;
695 unsigned long ver;
696 const void *pval;
697 int len, portid;
698 struct chmc *p;
699 int err;
700
701 err = -ENODEV;
702 __asm__ ("rdpr %%ver, %0" : "=r" (ver));
703 if ((ver >> 32UL) == __JALAPENO_ID ||
704 (ver >> 32UL) == __SERRANO_ID)
705 goto out;
706
707 portid = of_getintprop_default(dp, "portid", -1);
708 if (portid == -1)
709 goto out;
710
711 pval = of_get_property(dp, "memory-layout", &len);
712 if (pval && len > sizeof(p->layout_prop)) {
713 printk(KERN_ERR PFX "Unexpected memory-layout property "
714 "size %d.\n", len);
715 goto out;
716 }
717
718 err = -ENOMEM;
719 p = kzalloc(sizeof(*p), GFP_KERNEL);
720 if (!p) {
721 printk(KERN_ERR PFX "Could not allocate struct chmc.\n");
722 goto out;
723 }
724
725 p->portid = portid;
726 p->layout_size = len;
727 if (!pval)
728 p->layout_size = 0;
729 else
730 memcpy(&p->layout_prop, pval, len);
731
732 p->regs = of_ioremap(&op->resource[0], 0, 0x48, "chmc");
733 if (!p->regs) {
734 printk(KERN_ERR PFX "Could not map registers.\n");
735 goto out_free;
736 }
737
738 if (p->layout_size != 0UL) {
739 p->timing_control1 = chmc_read_mcreg(p, CHMCTRL_TCTRL1);
740 p->timing_control2 = chmc_read_mcreg(p, CHMCTRL_TCTRL2);
741 p->timing_control3 = chmc_read_mcreg(p, CHMCTRL_TCTRL3);
742 p->timing_control4 = chmc_read_mcreg(p, CHMCTRL_TCTRL4);
743 p->memaddr_control = chmc_read_mcreg(p, CHMCTRL_MACTRL);
744 }
745
746 chmc_fetch_decode_regs(p);
747
748 mc_list_add(&p->list);
749
750 printk(KERN_INFO PFX "UltraSPARC-III memory controller at %s [%s]\n",
751 dp->full_name,
752 (p->layout_size ? "ACTIVE" : "INACTIVE"));
753
754 dev_set_drvdata(&op->dev, p);
755
756 err = 0;
757
758 out:
759 return err;
760
761 out_free:
762 kfree(p);
763 goto out;
764 }
765
766 static int __devinit us3mc_probe(struct platform_device *op)
767 {
768 if (mc_type == MC_TYPE_SAFARI)
769 return chmc_probe(op);
770 else if (mc_type == MC_TYPE_JBUS)
771 return jbusmc_probe(op);
772 return -ENODEV;
773 }
774
775 static void __devexit chmc_destroy(struct platform_device *op, struct chmc *p)
776 {
777 list_del(&p->list);
778 of_iounmap(&op->resource[0], p->regs, 0x48);
779 kfree(p);
780 }
781
782 static void __devexit jbusmc_destroy(struct platform_device *op, struct jbusmc *p)
783 {
784 mc_list_del(&p->list);
785 of_iounmap(&op->resource[0], p->regs, JBUSMC_REGS_SIZE);
786 kfree(p);
787 }
788
789 static int __devexit us3mc_remove(struct platform_device *op)
790 {
791 void *p = dev_get_drvdata(&op->dev);
792
793 if (p) {
794 if (mc_type == MC_TYPE_SAFARI)
795 chmc_destroy(op, p);
796 else if (mc_type == MC_TYPE_JBUS)
797 jbusmc_destroy(op, p);
798 }
799 return 0;
800 }
801
802 static const struct of_device_id us3mc_match[] = {
803 {
804 .name = "memory-controller",
805 },
806 {},
807 };
808 MODULE_DEVICE_TABLE(of, us3mc_match);
809
810 static struct platform_driver us3mc_driver = {
811 .driver = {
812 .name = "us3mc",
813 .owner = THIS_MODULE,
814 .of_match_table = us3mc_match,
815 },
816 .probe = us3mc_probe,
817 .remove = __devexit_p(us3mc_remove),
818 };
819
820 static inline bool us3mc_platform(void)
821 {
822 if (tlb_type == cheetah || tlb_type == cheetah_plus)
823 return true;
824 return false;
825 }
826
827 static int __init us3mc_init(void)
828 {
829 unsigned long ver;
830 int ret;
831
832 if (!us3mc_platform())
833 return -ENODEV;
834
835 __asm__ __volatile__("rdpr %%ver, %0" : "=r" (ver));
836 if ((ver >> 32UL) == __JALAPENO_ID ||
837 (ver >> 32UL) == __SERRANO_ID) {
838 mc_type = MC_TYPE_JBUS;
839 us3mc_dimm_printer = jbusmc_print_dimm;
840 } else {
841 mc_type = MC_TYPE_SAFARI;
842 us3mc_dimm_printer = chmc_print_dimm;
843 }
844
845 ret = register_dimm_printer(us3mc_dimm_printer);
846
847 if (!ret) {
848 ret = platform_driver_register(&us3mc_driver);
849 if (ret)
850 unregister_dimm_printer(us3mc_dimm_printer);
851 }
852 return ret;
853 }
854
855 static void __exit us3mc_cleanup(void)
856 {
857 if (us3mc_platform()) {
858 unregister_dimm_printer(us3mc_dimm_printer);
859 platform_driver_unregister(&us3mc_driver);
860 }
861 }
862
863 module_init(us3mc_init);
864 module_exit(us3mc_cleanup);
Mirror of the linux-mips.org kernel tree