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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / arch / sparc / kernel / chmc.c
blob6ff43df740e08e9f4a8c69446a3fe4f9ab9607f1
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* chmc.c: Driver for UltraSPARC-III memory controller.
3 *
4 * Copyright (C) 2001, 2007, 2008 David S. Miller (davem@davemloft.net)
5 */
6
7 #include <linux/module.h>
8 #include <linux/kernel.h>
9 #include <linux/types.h>
10 #include <linux/slab.h>
11 #include <linux/list.h>
12 #include <linux/string.h>
13 #include <linux/sched.h>
14 #include <linux/smp.h>
15 #include <linux/errno.h>
16 #include <linux/init.h>
17 #include <linux/of.h>
18 #include <linux/of_device.h>
19 #include <asm/spitfire.h>
20 #include <asm/chmctrl.h>
21 #include <asm/cpudata.h>
22 #include <asm/oplib.h>
23 #include <asm/prom.h>
24 #include <asm/head.h>
25 #include <asm/io.h>
26 #include <asm/memctrl.h>
27
28 #define DRV_MODULE_NAME "chmc"
29 #define PFX DRV_MODULE_NAME ": "
30 #define DRV_MODULE_VERSION "0.2"
31
32 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
33 MODULE_DESCRIPTION("UltraSPARC-III memory controller driver");
34 MODULE_LICENSE("GPL");
35 MODULE_VERSION(DRV_MODULE_VERSION);
36
37 static int mc_type;
38 #define MC_TYPE_SAFARI 1
39 #define MC_TYPE_JBUS 2
40
41 static dimm_printer_t us3mc_dimm_printer;
42
43 #define CHMCTRL_NDGRPS 2
44 #define CHMCTRL_NDIMMS 4
45
46 #define CHMC_DIMMS_PER_MC (CHMCTRL_NDGRPS * CHMCTRL_NDIMMS)
47
48 /* OBP memory-layout property format. */
49 struct chmc_obp_map {
50 unsigned char dimm_map[144];
51 unsigned char pin_map[576];
52 };
53
54 #define DIMM_LABEL_SZ 8
55
56 struct chmc_obp_mem_layout {
57 /* One max 8-byte string label per DIMM. Usually
58 * this matches the label on the motherboard where
59 * that DIMM resides.
60 */
61 char dimm_labels[CHMC_DIMMS_PER_MC][DIMM_LABEL_SZ];
62
63 /* If symmetric use map[0], else it is
64 * asymmetric and map[1] should be used.
65 */
66 char symmetric;
67
68 struct chmc_obp_map map[2];
69 };
70
71 #define CHMCTRL_NBANKS 4
72
73 struct chmc_bank_info {
74 struct chmc *p;
75 int bank_id;
76
77 u64 raw_reg;
78 int valid;
79 int uk;
80 int um;
81 int lk;
82 int lm;
83 int interleave;
84 unsigned long base;
85 unsigned long size;
86 };
87
88 struct chmc {
89 struct list_head list;
90 int portid;
91
92 struct chmc_obp_mem_layout layout_prop;
93 int layout_size;
94
95 void __iomem *regs;
96
97 u64 timing_control1;
98 u64 timing_control2;
99 u64 timing_control3;
100 u64 timing_control4;
101 u64 memaddr_control;
102
103 struct chmc_bank_info logical_banks[CHMCTRL_NBANKS];
104 };
105
106 #define JBUSMC_REGS_SIZE 8
107
108 #define JB_MC_REG1_DIMM2_BANK3 0x8000000000000000UL
109 #define JB_MC_REG1_DIMM1_BANK1 0x4000000000000000UL
110 #define JB_MC_REG1_DIMM2_BANK2 0x2000000000000000UL
111 #define JB_MC_REG1_DIMM1_BANK0 0x1000000000000000UL
112 #define JB_MC_REG1_XOR 0x0000010000000000UL
113 #define JB_MC_REG1_ADDR_GEN_2 0x000000e000000000UL
114 #define JB_MC_REG1_ADDR_GEN_2_SHIFT 37
115 #define JB_MC_REG1_ADDR_GEN_1 0x0000001c00000000UL
116 #define JB_MC_REG1_ADDR_GEN_1_SHIFT 34
117 #define JB_MC_REG1_INTERLEAVE 0x0000000001800000UL
118 #define JB_MC_REG1_INTERLEAVE_SHIFT 23
119 #define JB_MC_REG1_DIMM2_PTYPE 0x0000000000200000UL
120 #define JB_MC_REG1_DIMM2_PTYPE_SHIFT 21
121 #define JB_MC_REG1_DIMM1_PTYPE 0x0000000000100000UL
122 #define JB_MC_REG1_DIMM1_PTYPE_SHIFT 20
123
124 #define PART_TYPE_X8 0
125 #define PART_TYPE_X4 1
126
127 #define INTERLEAVE_NONE 0
128 #define INTERLEAVE_SAME 1
129 #define INTERLEAVE_INTERNAL 2
130 #define INTERLEAVE_BOTH 3
131
132 #define ADDR_GEN_128MB 0
133 #define ADDR_GEN_256MB 1
134 #define ADDR_GEN_512MB 2
135 #define ADDR_GEN_1GB 3
136
137 #define JB_NUM_DIMM_GROUPS 2
138 #define JB_NUM_DIMMS_PER_GROUP 2
139 #define JB_NUM_DIMMS (JB_NUM_DIMM_GROUPS * JB_NUM_DIMMS_PER_GROUP)
140
141 struct jbusmc_obp_map {
142 unsigned char dimm_map[18];
143 unsigned char pin_map[144];
144 };
145
146 struct jbusmc_obp_mem_layout {
147 /* One max 8-byte string label per DIMM. Usually
148 * this matches the label on the motherboard where
149 * that DIMM resides.
150 */
151 char dimm_labels[JB_NUM_DIMMS][DIMM_LABEL_SZ];
152
153 /* If symmetric use map[0], else it is
154 * asymmetric and map[1] should be used.
155 */
156 char symmetric;
157
158 struct jbusmc_obp_map map;
159
160 char _pad;
161 };
162
163 struct jbusmc_dimm_group {
164 struct jbusmc *controller;
165 int index;
166 u64 base_addr;
167 u64 size;
168 };
169
170 struct jbusmc {
171 void __iomem *regs;
172 u64 mc_reg_1;
173 u32 portid;
174 struct jbusmc_obp_mem_layout layout;
175 int layout_len;
176 int num_dimm_groups;
177 struct jbusmc_dimm_group dimm_groups[JB_NUM_DIMM_GROUPS];
178 struct list_head list;
179 };
180
181 static DEFINE_SPINLOCK(mctrl_list_lock);
182 static LIST_HEAD(mctrl_list);
183
184 static void mc_list_add(struct list_head *list)
185 {
186 spin_lock(&mctrl_list_lock);
187 list_add(list, &mctrl_list);
188 spin_unlock(&mctrl_list_lock);
189 }
190
191 static void mc_list_del(struct list_head *list)
192 {
193 spin_lock(&mctrl_list_lock);
194 list_del_init(list);
195 spin_unlock(&mctrl_list_lock);
196 }
197
198 #define SYNDROME_MIN -1
199 #define SYNDROME_MAX 144
200
201 /* Covert syndrome code into the way the bits are positioned
202 * on the bus.
203 */
204 static int syndrome_to_qword_code(int syndrome_code)
205 {
206 if (syndrome_code < 128)
207 syndrome_code += 16;
208 else if (syndrome_code < 128 + 9)
209 syndrome_code -= (128 - 7);
210 else if (syndrome_code < (128 + 9 + 3))
211 syndrome_code -= (128 + 9 - 4);
212 else
213 syndrome_code -= (128 + 9 + 3);
214 return syndrome_code;
215 }
216
217 /* All this magic has to do with how a cache line comes over the wire
218 * on Safari and JBUS. A 64-bit line comes over in 1 or more quadword
219 * cycles, each of which transmit ECC/MTAG info as well as the actual
220 * data.
221 */
222 #define L2_LINE_SIZE 64
223 #define L2_LINE_ADDR_MSK (L2_LINE_SIZE - 1)
224 #define QW_PER_LINE 4
225 #define QW_BYTES (L2_LINE_SIZE / QW_PER_LINE)
226 #define QW_BITS 144
227 #define SAFARI_LAST_BIT (576 - 1)
228 #define JBUS_LAST_BIT (144 - 1)
229
230 static void get_pin_and_dimm_str(int syndrome_code, unsigned long paddr,
231 int *pin_p, char **dimm_str_p, void *_prop,
232 int base_dimm_offset)
233 {
234 int qword_code = syndrome_to_qword_code(syndrome_code);
235 int cache_line_offset;
236 int offset_inverse;
237 int dimm_map_index;
238 int map_val;
239
240 if (mc_type == MC_TYPE_JBUS) {
241 struct jbusmc_obp_mem_layout *p = _prop;
242
243 /* JBUS */
244 cache_line_offset = qword_code;
245 offset_inverse = (JBUS_LAST_BIT - cache_line_offset);
246 dimm_map_index = offset_inverse / 8;
247 map_val = p->map.dimm_map[dimm_map_index];
248 map_val = ((map_val >> ((7 - (offset_inverse & 7)))) & 1);
249 *dimm_str_p = p->dimm_labels[base_dimm_offset + map_val];
250 *pin_p = p->map.pin_map[cache_line_offset];
251 } else {
252 struct chmc_obp_mem_layout *p = _prop;
253 struct chmc_obp_map *mp;
254 int qword;
255
256 /* Safari */
257 if (p->symmetric)
258 mp = &p->map[0];
259 else
260 mp = &p->map[1];
261
262 qword = (paddr & L2_LINE_ADDR_MSK) / QW_BYTES;
263 cache_line_offset = ((3 - qword) * QW_BITS) + qword_code;
264 offset_inverse = (SAFARI_LAST_BIT - cache_line_offset);
265 dimm_map_index = offset_inverse >> 2;
266 map_val = mp->dimm_map[dimm_map_index];
267 map_val = ((map_val >> ((3 - (offset_inverse & 3)) << 1)) & 0x3);
268 *dimm_str_p = p->dimm_labels[base_dimm_offset + map_val];
269 *pin_p = mp->pin_map[cache_line_offset];
270 }
271 }
272
273 static struct jbusmc_dimm_group *jbusmc_find_dimm_group(unsigned long phys_addr)
274 {
275 struct jbusmc *p;
276
277 list_for_each_entry(p, &mctrl_list, list) {
278 int i;
279
280 for (i = 0; i < p->num_dimm_groups; i++) {
281 struct jbusmc_dimm_group *dp = &p->dimm_groups[i];
282
283 if (phys_addr < dp->base_addr ||
284 (dp->base_addr + dp->size) <= phys_addr)
285 continue;
286
287 return dp;
288 }
289 }
290 return NULL;
291 }
292
293 static int jbusmc_print_dimm(int syndrome_code,
294 unsigned long phys_addr,
295 char *buf, int buflen)
296 {
297 struct jbusmc_obp_mem_layout *prop;
298 struct jbusmc_dimm_group *dp;
299 struct jbusmc *p;
300 int first_dimm;
301
302 dp = jbusmc_find_dimm_group(phys_addr);
303 if (dp == NULL ||
304 syndrome_code < SYNDROME_MIN ||
305 syndrome_code > SYNDROME_MAX) {
306 buf[0] = '?';
307 buf[1] = '?';
308 buf[2] = '?';
309 buf[3] = '\0';
310 return 0;
311 }
312 p = dp->controller;
313 prop = &p->layout;
314
315 first_dimm = dp->index * JB_NUM_DIMMS_PER_GROUP;
316
317 if (syndrome_code != SYNDROME_MIN) {
318 char *dimm_str;
319 int pin;
320
321 get_pin_and_dimm_str(syndrome_code, phys_addr, &pin,
322 &dimm_str, prop, first_dimm);
323 sprintf(buf, "%s, pin %3d", dimm_str, pin);
324 } else {
325 int dimm;
326
327 /* Multi-bit error, we just dump out all the
328 * dimm labels associated with this dimm group.
329 */
330 for (dimm = 0; dimm < JB_NUM_DIMMS_PER_GROUP; dimm++) {
331 sprintf(buf, "%s ",
332 prop->dimm_labels[first_dimm + dimm]);
333 buf += strlen(buf);
334 }
335 }
336
337 return 0;
338 }
339
340 static u64 jbusmc_dimm_group_size(u64 base,
341 const struct linux_prom64_registers *mem_regs,
342 int num_mem_regs)
343 {
344 u64 max = base + (8UL * 1024 * 1024 * 1024);
345 u64 max_seen = base;
346 int i;
347
348 for (i = 0; i < num_mem_regs; i++) {
349 const struct linux_prom64_registers *ent;
350 u64 this_base;
351 u64 this_end;
352
353 ent = &mem_regs[i];
354 this_base = ent->phys_addr;
355 this_end = this_base + ent->reg_size;
356 if (base < this_base || base >= this_end)
357 continue;
358 if (this_end > max)
359 this_end = max;
360 if (this_end > max_seen)
361 max_seen = this_end;
362 }
363
364 return max_seen - base;
365 }
366
367 static void jbusmc_construct_one_dimm_group(struct jbusmc *p,
368 unsigned long index,
369 const struct linux_prom64_registers *mem_regs,
370 int num_mem_regs)
371 {
372 struct jbusmc_dimm_group *dp = &p->dimm_groups[index];
373
374 dp->controller = p;
375 dp->index = index;
376
377 dp->base_addr = (p->portid * (64UL * 1024 * 1024 * 1024));
378 dp->base_addr += (index * (8UL * 1024 * 1024 * 1024));
379 dp->size = jbusmc_dimm_group_size(dp->base_addr, mem_regs, num_mem_regs);
380 }
381
382 static void jbusmc_construct_dimm_groups(struct jbusmc *p,
383 const struct linux_prom64_registers *mem_regs,
384 int num_mem_regs)
385 {
386 if (p->mc_reg_1 & JB_MC_REG1_DIMM1_BANK0) {
387 jbusmc_construct_one_dimm_group(p, 0, mem_regs, num_mem_regs);
388 p->num_dimm_groups++;
389 }
390 if (p->mc_reg_1 & JB_MC_REG1_DIMM2_BANK2) {
391 jbusmc_construct_one_dimm_group(p, 1, mem_regs, num_mem_regs);
392 p->num_dimm_groups++;
393 }
394 }
395
396 static int jbusmc_probe(struct platform_device *op)
397 {
398 const struct linux_prom64_registers *mem_regs;
399 struct device_node *mem_node;
400 int err, len, num_mem_regs;
401 struct jbusmc *p;
402 const u32 *prop;
403 const void *ml;
404
405 err = -ENODEV;
406 mem_node = of_find_node_by_path("/memory");
407 if (!mem_node) {
408 printk(KERN_ERR PFX "Cannot find /memory node.\n");
409 goto out;
410 }
411 mem_regs = of_get_property(mem_node, "reg", &len);
412 if (!mem_regs) {
413 printk(KERN_ERR PFX "Cannot get reg property of /memory node.\n");
414 goto out;
415 }
416 num_mem_regs = len / sizeof(*mem_regs);
417
418 err = -ENOMEM;
419 p = kzalloc(sizeof(*p), GFP_KERNEL);
420 if (!p) {
421 printk(KERN_ERR PFX "Cannot allocate struct jbusmc.\n");
422 goto out;
423 }
424
425 INIT_LIST_HEAD(&p->list);
426
427 err = -ENODEV;
428 prop = of_get_property(op->dev.of_node, "portid", &len);
429 if (!prop || len != 4) {
430 printk(KERN_ERR PFX "Cannot find portid.\n");
431 goto out_free;
432 }
433
434 p->portid = *prop;
435
436 prop = of_get_property(op->dev.of_node, "memory-control-register-1", &len);
437 if (!prop || len != 8) {
438 printk(KERN_ERR PFX "Cannot get memory control register 1.\n");
439 goto out_free;
440 }
441
442 p->mc_reg_1 = ((u64)prop[0] << 32) | (u64) prop[1];
443
444 err = -ENOMEM;
445 p->regs = of_ioremap(&op->resource[0], 0, JBUSMC_REGS_SIZE, "jbusmc");
446 if (!p->regs) {
447 printk(KERN_ERR PFX "Cannot map jbusmc regs.\n");
448 goto out_free;
449 }
450
451 err = -ENODEV;
452 ml = of_get_property(op->dev.of_node, "memory-layout", &p->layout_len);
453 if (!ml) {
454 printk(KERN_ERR PFX "Cannot get memory layout property.\n");
455 goto out_iounmap;
456 }
457 if (p->layout_len > sizeof(p->layout)) {
458 printk(KERN_ERR PFX "Unexpected memory-layout size %d\n",
459 p->layout_len);
460 goto out_iounmap;
461 }
462 memcpy(&p->layout, ml, p->layout_len);
463
464 jbusmc_construct_dimm_groups(p, mem_regs, num_mem_regs);
465
466 mc_list_add(&p->list);
467
468 printk(KERN_INFO PFX "UltraSPARC-IIIi memory controller at %pOF\n",
469 op->dev.of_node);
470
471 dev_set_drvdata(&op->dev, p);
472
473 err = 0;
474
475 out:
476 return err;
477
478 out_iounmap:
479 of_iounmap(&op->resource[0], p->regs, JBUSMC_REGS_SIZE);
480
481 out_free:
482 kfree(p);
483 goto out;
484 }
485
486 /* Does BANK decode PHYS_ADDR? */
487 static int chmc_bank_match(struct chmc_bank_info *bp, unsigned long phys_addr)
488 {
489 unsigned long upper_bits = (phys_addr & PA_UPPER_BITS) >> PA_UPPER_BITS_SHIFT;
490 unsigned long lower_bits = (phys_addr & PA_LOWER_BITS) >> PA_LOWER_BITS_SHIFT;
491
492 /* Bank must be enabled to match. */
493 if (bp->valid == 0)
494 return 0;
495
496 /* Would BANK match upper bits? */
497 upper_bits ^= bp->um; /* What bits are different? */
498 upper_bits = ~upper_bits; /* Invert. */
499 upper_bits |= bp->uk; /* What bits don't matter for matching? */
500 upper_bits = ~upper_bits; /* Invert. */
501
502 if (upper_bits)
503 return 0;
504
505 /* Would BANK match lower bits? */
506 lower_bits ^= bp->lm; /* What bits are different? */
507 lower_bits = ~lower_bits; /* Invert. */
508 lower_bits |= bp->lk; /* What bits don't matter for matching? */
509 lower_bits = ~lower_bits; /* Invert. */
510
511 if (lower_bits)
512 return 0;
513
514 /* I always knew you'd be the one. */
515 return 1;
516 }
517
518 /* Given PHYS_ADDR, search memory controller banks for a match. */
519 static struct chmc_bank_info *chmc_find_bank(unsigned long phys_addr)
520 {
521 struct chmc *p;
522
523 list_for_each_entry(p, &mctrl_list, list) {
524 int bank_no;
525
526 for (bank_no = 0; bank_no < CHMCTRL_NBANKS; bank_no++) {
527 struct chmc_bank_info *bp;
528
529 bp = &p->logical_banks[bank_no];
530 if (chmc_bank_match(bp, phys_addr))
531 return bp;
532 }
533 }
534
535 return NULL;
536 }
537
538 /* This is the main purpose of this driver. */
539 static int chmc_print_dimm(int syndrome_code,
540 unsigned long phys_addr,
541 char *buf, int buflen)
542 {
543 struct chmc_bank_info *bp;
544 struct chmc_obp_mem_layout *prop;
545 int bank_in_controller, first_dimm;
546
547 bp = chmc_find_bank(phys_addr);
548 if (bp == NULL ||
549 syndrome_code < SYNDROME_MIN ||
550 syndrome_code > SYNDROME_MAX) {
551 buf[0] = '?';
552 buf[1] = '?';
553 buf[2] = '?';
554 buf[3] = '\0';
555 return 0;
556 }
557
558 prop = &bp->p->layout_prop;
559 bank_in_controller = bp->bank_id & (CHMCTRL_NBANKS - 1);
560 first_dimm = (bank_in_controller & (CHMCTRL_NDGRPS - 1));
561 first_dimm *= CHMCTRL_NDIMMS;
562
563 if (syndrome_code != SYNDROME_MIN) {
564 char *dimm_str;
565 int pin;
566
567 get_pin_and_dimm_str(syndrome_code, phys_addr, &pin,
568 &dimm_str, prop, first_dimm);
569 sprintf(buf, "%s, pin %3d", dimm_str, pin);
570 } else {
571 int dimm;
572
573 /* Multi-bit error, we just dump out all the
574 * dimm labels associated with this bank.
575 */
576 for (dimm = 0; dimm < CHMCTRL_NDIMMS; dimm++) {
577 sprintf(buf, "%s ",
578 prop->dimm_labels[first_dimm + dimm]);
579 buf += strlen(buf);
580 }
581 }
582 return 0;
583 }
584
585 /* Accessing the registers is slightly complicated. If you want
586 * to get at the memory controller which is on the same processor
587 * the code is executing, you must use special ASI load/store else
588 * you go through the global mapping.
589 */
590 static u64 chmc_read_mcreg(struct chmc *p, unsigned long offset)
591 {
592 unsigned long ret, this_cpu;
593
594 preempt_disable();
595
596 this_cpu = real_hard_smp_processor_id();
597
598 if (p->portid == this_cpu) {
599 __asm__ __volatile__("ldxa [%1] %2, %0"
600 : "=r" (ret)
601 : "r" (offset), "i" (ASI_MCU_CTRL_REG));
602 } else {
603 __asm__ __volatile__("ldxa [%1] %2, %0"
604 : "=r" (ret)
605 : "r" (p->regs + offset),
606 "i" (ASI_PHYS_BYPASS_EC_E));
607 }
608
609 preempt_enable();
610
611 return ret;
612 }
613
614 #if 0 /* currently unused */
615 static void chmc_write_mcreg(struct chmc *p, unsigned long offset, u64 val)
616 {
617 if (p->portid == smp_processor_id()) {
618 __asm__ __volatile__("stxa %0, [%1] %2"
619 : : "r" (val),
620 "r" (offset), "i" (ASI_MCU_CTRL_REG));
621 } else {
622 __asm__ __volatile__("ldxa %0, [%1] %2"
623 : : "r" (val),
624 "r" (p->regs + offset),
625 "i" (ASI_PHYS_BYPASS_EC_E));
626 }
627 }
628 #endif
629
630 static void chmc_interpret_one_decode_reg(struct chmc *p, int which_bank, u64 val)
631 {
632 struct chmc_bank_info *bp = &p->logical_banks[which_bank];
633
634 bp->p = p;
635 bp->bank_id = (CHMCTRL_NBANKS * p->portid) + which_bank;
636 bp->raw_reg = val;
637 bp->valid = (val & MEM_DECODE_VALID) >> MEM_DECODE_VALID_SHIFT;
638 bp->uk = (val & MEM_DECODE_UK) >> MEM_DECODE_UK_SHIFT;
639 bp->um = (val & MEM_DECODE_UM) >> MEM_DECODE_UM_SHIFT;
640 bp->lk = (val & MEM_DECODE_LK) >> MEM_DECODE_LK_SHIFT;
641 bp->lm = (val & MEM_DECODE_LM) >> MEM_DECODE_LM_SHIFT;
642
643 bp->base = (bp->um);
644 bp->base &= ~(bp->uk);
645 bp->base <<= PA_UPPER_BITS_SHIFT;
646
647 switch(bp->lk) {
648 case 0xf:
649 default:
650 bp->interleave = 1;
651 break;
652
653 case 0xe:
654 bp->interleave = 2;
655 break;
656
657 case 0xc:
658 bp->interleave = 4;
659 break;
660
661 case 0x8:
662 bp->interleave = 8;
663 break;
664
665 case 0x0:
666 bp->interleave = 16;
667 break;
668 }
669
670 /* UK[10] is reserved, and UK[11] is not set for the SDRAM
671 * bank size definition.
672 */
673 bp->size = (((unsigned long)bp->uk &
674 ((1UL << 10UL) - 1UL)) + 1UL) << PA_UPPER_BITS_SHIFT;
675 bp->size /= bp->interleave;
676 }
677
678 static void chmc_fetch_decode_regs(struct chmc *p)
679 {
680 if (p->layout_size == 0)
681 return;
682
683 chmc_interpret_one_decode_reg(p, 0,
684 chmc_read_mcreg(p, CHMCTRL_DECODE1));
685 chmc_interpret_one_decode_reg(p, 1,
686 chmc_read_mcreg(p, CHMCTRL_DECODE2));
687 chmc_interpret_one_decode_reg(p, 2,
688 chmc_read_mcreg(p, CHMCTRL_DECODE3));
689 chmc_interpret_one_decode_reg(p, 3,
690 chmc_read_mcreg(p, CHMCTRL_DECODE4));
691 }
692
693 static int chmc_probe(struct platform_device *op)
694 {
695 struct device_node *dp = op->dev.of_node;
696 unsigned long ver;
697 const void *pval;
698 int len, portid;
699 struct chmc *p;
700 int err;
701
702 err = -ENODEV;
703 __asm__ ("rdpr %%ver, %0" : "=r" (ver));
704 if ((ver >> 32UL) == __JALAPENO_ID ||
705 (ver >> 32UL) == __SERRANO_ID)
706 goto out;
707
708 portid = of_getintprop_default(dp, "portid", -1);
709 if (portid == -1)
710 goto out;
711
712 pval = of_get_property(dp, "memory-layout", &len);
713 if (pval && len > sizeof(p->layout_prop)) {
714 printk(KERN_ERR PFX "Unexpected memory-layout property "
715 "size %d.\n", len);
716 goto out;
717 }
718
719 err = -ENOMEM;
720 p = kzalloc(sizeof(*p), GFP_KERNEL);
721 if (!p) {
722 printk(KERN_ERR PFX "Could not allocate struct chmc.\n");
723 goto out;
724 }
725
726 p->portid = portid;
727 p->layout_size = len;
728 if (!pval)
729 p->layout_size = 0;
730 else
731 memcpy(&p->layout_prop, pval, len);
732
733 p->regs = of_ioremap(&op->resource[0], 0, 0x48, "chmc");
734 if (!p->regs) {
735 printk(KERN_ERR PFX "Could not map registers.\n");
736 goto out_free;
737 }
738
739 if (p->layout_size != 0UL) {
740 p->timing_control1 = chmc_read_mcreg(p, CHMCTRL_TCTRL1);
741 p->timing_control2 = chmc_read_mcreg(p, CHMCTRL_TCTRL2);
742 p->timing_control3 = chmc_read_mcreg(p, CHMCTRL_TCTRL3);
743 p->timing_control4 = chmc_read_mcreg(p, CHMCTRL_TCTRL4);
744 p->memaddr_control = chmc_read_mcreg(p, CHMCTRL_MACTRL);
745 }
746
747 chmc_fetch_decode_regs(p);
748
749 mc_list_add(&p->list);
750
751 printk(KERN_INFO PFX "UltraSPARC-III memory controller at %pOF [%s]\n",
752 dp,
753 (p->layout_size ? "ACTIVE" : "INACTIVE"));
754
755 dev_set_drvdata(&op->dev, p);
756
757 err = 0;
758
759 out:
760 return err;
761
762 out_free:
763 kfree(p);
764 goto out;
765 }
766
767 static int us3mc_probe(struct platform_device *op)
768 {
769 if (mc_type == MC_TYPE_SAFARI)
770 return chmc_probe(op);
771 else if (mc_type == MC_TYPE_JBUS)
772 return jbusmc_probe(op);
773 return -ENODEV;
774 }
775
776 static void chmc_destroy(struct platform_device *op, struct chmc *p)
777 {
778 list_del(&p->list);
779 of_iounmap(&op->resource[0], p->regs, 0x48);
780 kfree(p);
781 }
782
783 static void jbusmc_destroy(struct platform_device *op, struct jbusmc *p)
784 {
785 mc_list_del(&p->list);
786 of_iounmap(&op->resource[0], p->regs, JBUSMC_REGS_SIZE);
787 kfree(p);
788 }
789
790 static int us3mc_remove(struct platform_device *op)
791 {
792 void *p = dev_get_drvdata(&op->dev);
793
794 if (p) {
795 if (mc_type == MC_TYPE_SAFARI)
796 chmc_destroy(op, p);
797 else if (mc_type == MC_TYPE_JBUS)
798 jbusmc_destroy(op, p);
799 }
800 return 0;
801 }
802
803 static const struct of_device_id us3mc_match[] = {
804 {
805 .name = "memory-controller",
806 },
807 {},
808 };
809 MODULE_DEVICE_TABLE(of, us3mc_match);
810
811 static struct platform_driver us3mc_driver = {
812 .driver = {
813 .name = "us3mc",
814 .of_match_table = us3mc_match,
815 },
816 .probe = us3mc_probe,
817 .remove = 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);
Linux with added FPC-III support