Merge branch 'topic/msnd' into for-linus
[linux-2.6] / arch / sparc / kernel / chmc.c
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 of_device *op,
396                                   const struct of_device_id *match)
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->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->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->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 %s\n",
469                op->node->full_name);
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 __devinit chmc_probe(struct of_device *op,
694                                 const struct of_device_id *match)
695 {
696         struct device_node *dp = op->node;
697         unsigned long ver;
698         const void *pval;
699         int len, portid;
700         struct chmc *p;
701         int err;
702
703         err = -ENODEV;
704         __asm__ ("rdpr %%ver, %0" : "=r" (ver));
705         if ((ver >> 32UL) == __JALAPENO_ID ||
706             (ver >> 32UL) == __SERRANO_ID)
707                 goto out;
708
709         portid = of_getintprop_default(dp, "portid", -1);
710         if (portid == -1)
711                 goto out;
712
713         pval = of_get_property(dp, "memory-layout", &len);
714         if (pval && len > sizeof(p->layout_prop)) {
715                 printk(KERN_ERR PFX "Unexpected memory-layout property "
716                        "size %d.\n", len);
717                 goto out;
718         }
719
720         err = -ENOMEM;
721         p = kzalloc(sizeof(*p), GFP_KERNEL);
722         if (!p) {
723                 printk(KERN_ERR PFX "Could not allocate struct chmc.\n");
724                 goto out;
725         }
726
727         p->portid = portid;
728         p->layout_size = len;
729         if (!pval)
730                 p->layout_size = 0;
731         else
732                 memcpy(&p->layout_prop, pval, len);
733
734         p->regs = of_ioremap(&op->resource[0], 0, 0x48, "chmc");
735         if (!p->regs) {
736                 printk(KERN_ERR PFX "Could not map registers.\n");
737                 goto out_free;
738         }
739
740         if (p->layout_size != 0UL) {
741                 p->timing_control1 = chmc_read_mcreg(p, CHMCTRL_TCTRL1);
742                 p->timing_control2 = chmc_read_mcreg(p, CHMCTRL_TCTRL2);
743                 p->timing_control3 = chmc_read_mcreg(p, CHMCTRL_TCTRL3);
744                 p->timing_control4 = chmc_read_mcreg(p, CHMCTRL_TCTRL4);
745                 p->memaddr_control = chmc_read_mcreg(p, CHMCTRL_MACTRL);
746         }
747
748         chmc_fetch_decode_regs(p);
749
750         mc_list_add(&p->list);
751
752         printk(KERN_INFO PFX "UltraSPARC-III memory controller at %s [%s]\n",
753                dp->full_name,
754                (p->layout_size ? "ACTIVE" : "INACTIVE"));
755
756         dev_set_drvdata(&op->dev, p);
757
758         err = 0;
759
760 out:
761         return err;
762
763 out_free:
764         kfree(p);
765         goto out;
766 }
767
768 static int __devinit us3mc_probe(struct of_device *op,
769                                 const struct of_device_id *match)
770 {
771         if (mc_type == MC_TYPE_SAFARI)
772                 return chmc_probe(op, match);
773         else if (mc_type == MC_TYPE_JBUS)
774                 return jbusmc_probe(op, match);
775         return -ENODEV;
776 }
777
778 static void __devexit chmc_destroy(struct of_device *op, struct chmc *p)
779 {
780         list_del(&p->list);
781         of_iounmap(&op->resource[0], p->regs, 0x48);
782         kfree(p);
783 }
784
785 static void __devexit jbusmc_destroy(struct of_device *op, struct jbusmc *p)
786 {
787         mc_list_del(&p->list);
788         of_iounmap(&op->resource[0], p->regs, JBUSMC_REGS_SIZE);
789         kfree(p);
790 }
791
792 static int __devexit us3mc_remove(struct of_device *op)
793 {
794         void *p = dev_get_drvdata(&op->dev);
795
796         if (p) {
797                 if (mc_type == MC_TYPE_SAFARI)
798                         chmc_destroy(op, p);
799                 else if (mc_type == MC_TYPE_JBUS)
800                         jbusmc_destroy(op, p);
801         }
802         return 0;
803 }
804
805 static const struct of_device_id us3mc_match[] = {
806         {
807                 .name = "memory-controller",
808         },
809         {},
810 };
811 MODULE_DEVICE_TABLE(of, us3mc_match);
812
813 static struct of_platform_driver us3mc_driver = {
814         .name           = "us3mc",
815         .match_table    = us3mc_match,
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 = of_register_driver(&us3mc_driver, &of_bus_type);
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                 of_unregister_driver(&us3mc_driver);
860         }
861 }
862
863 module_init(us3mc_init);
864 module_exit(us3mc_cleanup);