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1da177e4 LT |
1 | /* $Id: chmc.c,v 1.4 2002/01/08 16:00:14 davem Exp $ |
2 | * memctrlr.c: Driver for UltraSPARC-III memory controller. | |
3 | * | |
4 | * Copyright (C) 2001 David S. Miller (davem@redhat.com) | |
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 <asm/spitfire.h> | |
18 | #include <asm/chmctrl.h> | |
19 | #include <asm/oplib.h> | |
20 | #include <asm/io.h> | |
21 | ||
22 | #define CHMCTRL_NDGRPS 2 | |
23 | #define CHMCTRL_NDIMMS 4 | |
24 | ||
25 | #define DIMMS_PER_MC (CHMCTRL_NDGRPS * CHMCTRL_NDIMMS) | |
26 | ||
27 | /* OBP memory-layout property format. */ | |
28 | struct obp_map { | |
29 | unsigned char dimm_map[144]; | |
30 | unsigned char pin_map[576]; | |
31 | }; | |
32 | ||
33 | #define DIMM_LABEL_SZ 8 | |
34 | ||
35 | struct obp_mem_layout { | |
36 | /* One max 8-byte string label per DIMM. Usually | |
37 | * this matches the label on the motherboard where | |
38 | * that DIMM resides. | |
39 | */ | |
40 | char dimm_labels[DIMMS_PER_MC][DIMM_LABEL_SZ]; | |
41 | ||
42 | /* If symmetric use map[0], else it is | |
43 | * asymmetric and map[1] should be used. | |
44 | */ | |
45 | char symmetric; | |
46 | ||
47 | struct obp_map map[2]; | |
48 | }; | |
49 | ||
50 | #define CHMCTRL_NBANKS 4 | |
51 | ||
52 | struct bank_info { | |
53 | struct mctrl_info *mp; | |
54 | int bank_id; | |
55 | ||
56 | u64 raw_reg; | |
57 | int valid; | |
58 | int uk; | |
59 | int um; | |
60 | int lk; | |
61 | int lm; | |
62 | int interleave; | |
63 | unsigned long base; | |
64 | unsigned long size; | |
65 | }; | |
66 | ||
67 | struct mctrl_info { | |
68 | struct list_head list; | |
69 | int portid; | |
70 | int index; | |
71 | ||
72 | struct obp_mem_layout layout_prop; | |
73 | int layout_size; | |
74 | ||
75 | void __iomem *regs; | |
76 | ||
77 | u64 timing_control1; | |
78 | u64 timing_control2; | |
79 | u64 timing_control3; | |
80 | u64 timing_control4; | |
81 | u64 memaddr_control; | |
82 | ||
83 | struct bank_info logical_banks[CHMCTRL_NBANKS]; | |
84 | }; | |
85 | ||
86 | static LIST_HEAD(mctrl_list); | |
87 | ||
88 | /* Does BANK decode PHYS_ADDR? */ | |
89 | static int bank_match(struct bank_info *bp, unsigned long phys_addr) | |
90 | { | |
91 | unsigned long upper_bits = (phys_addr & PA_UPPER_BITS) >> PA_UPPER_BITS_SHIFT; | |
92 | unsigned long lower_bits = (phys_addr & PA_LOWER_BITS) >> PA_LOWER_BITS_SHIFT; | |
93 | ||
94 | /* Bank must be enabled to match. */ | |
95 | if (bp->valid == 0) | |
96 | return 0; | |
97 | ||
98 | /* Would BANK match upper bits? */ | |
99 | upper_bits ^= bp->um; /* What bits are different? */ | |
100 | upper_bits = ~upper_bits; /* Invert. */ | |
101 | upper_bits |= bp->uk; /* What bits don't matter for matching? */ | |
102 | upper_bits = ~upper_bits; /* Invert. */ | |
103 | ||
104 | if (upper_bits) | |
105 | return 0; | |
106 | ||
107 | /* Would BANK match lower bits? */ | |
108 | lower_bits ^= bp->lm; /* What bits are different? */ | |
109 | lower_bits = ~lower_bits; /* Invert. */ | |
110 | lower_bits |= bp->lk; /* What bits don't matter for matching? */ | |
111 | lower_bits = ~lower_bits; /* Invert. */ | |
112 | ||
113 | if (lower_bits) | |
114 | return 0; | |
115 | ||
116 | /* I always knew you'd be the one. */ | |
117 | return 1; | |
118 | } | |
119 | ||
120 | /* Given PHYS_ADDR, search memory controller banks for a match. */ | |
121 | static struct bank_info *find_bank(unsigned long phys_addr) | |
122 | { | |
123 | struct list_head *mctrl_head = &mctrl_list; | |
124 | struct list_head *mctrl_entry = mctrl_head->next; | |
125 | ||
126 | for (;;) { | |
127 | struct mctrl_info *mp = | |
128 | list_entry(mctrl_entry, struct mctrl_info, list); | |
129 | int bank_no; | |
130 | ||
131 | if (mctrl_entry == mctrl_head) | |
132 | break; | |
133 | mctrl_entry = mctrl_entry->next; | |
134 | ||
135 | for (bank_no = 0; bank_no < CHMCTRL_NBANKS; bank_no++) { | |
136 | struct bank_info *bp; | |
137 | ||
138 | bp = &mp->logical_banks[bank_no]; | |
139 | if (bank_match(bp, phys_addr)) | |
140 | return bp; | |
141 | } | |
142 | } | |
143 | ||
144 | return NULL; | |
145 | } | |
146 | ||
147 | /* This is the main purpose of this driver. */ | |
148 | #define SYNDROME_MIN -1 | |
149 | #define SYNDROME_MAX 144 | |
150 | int chmc_getunumber(int syndrome_code, | |
151 | unsigned long phys_addr, | |
152 | char *buf, int buflen) | |
153 | { | |
154 | struct bank_info *bp; | |
155 | struct obp_mem_layout *prop; | |
156 | int bank_in_controller, first_dimm; | |
157 | ||
158 | bp = find_bank(phys_addr); | |
159 | if (bp == NULL || | |
160 | syndrome_code < SYNDROME_MIN || | |
161 | syndrome_code > SYNDROME_MAX) { | |
162 | buf[0] = '?'; | |
163 | buf[1] = '?'; | |
164 | buf[2] = '?'; | |
165 | buf[3] = '\0'; | |
166 | return 0; | |
167 | } | |
168 | ||
169 | prop = &bp->mp->layout_prop; | |
170 | bank_in_controller = bp->bank_id & (CHMCTRL_NBANKS - 1); | |
171 | first_dimm = (bank_in_controller & (CHMCTRL_NDGRPS - 1)); | |
172 | first_dimm *= CHMCTRL_NDIMMS; | |
173 | ||
174 | if (syndrome_code != SYNDROME_MIN) { | |
175 | struct obp_map *map; | |
176 | int qword, where_in_line, where, map_index, map_offset; | |
177 | unsigned int map_val; | |
178 | ||
179 | /* Yaay, single bit error so we can figure out | |
180 | * the exact dimm. | |
181 | */ | |
182 | if (prop->symmetric) | |
183 | map = &prop->map[0]; | |
184 | else | |
185 | map = &prop->map[1]; | |
186 | ||
187 | /* Covert syndrome code into the way the bits are | |
188 | * positioned on the bus. | |
189 | */ | |
190 | if (syndrome_code < 144 - 16) | |
191 | syndrome_code += 16; | |
192 | else if (syndrome_code < 144) | |
193 | syndrome_code -= (144 - 7); | |
194 | else if (syndrome_code < (144 + 3)) | |
195 | syndrome_code -= (144 + 3 - 4); | |
196 | else | |
197 | syndrome_code -= 144 + 3; | |
198 | ||
199 | /* All this magic has to do with how a cache line | |
200 | * comes over the wire on Safari. A 64-bit line | |
201 | * comes over in 4 quadword cycles, each of which | |
202 | * transmit ECC/MTAG info as well as the actual | |
203 | * data. 144 bits per quadword, 576 total. | |
204 | */ | |
205 | #define LINE_SIZE 64 | |
206 | #define LINE_ADDR_MSK (LINE_SIZE - 1) | |
207 | #define QW_PER_LINE 4 | |
208 | #define QW_BYTES (LINE_SIZE / QW_PER_LINE) | |
209 | #define QW_BITS 144 | |
210 | #define LAST_BIT (576 - 1) | |
211 | ||
212 | qword = (phys_addr & LINE_ADDR_MSK) / QW_BYTES; | |
213 | where_in_line = ((3 - qword) * QW_BITS) + syndrome_code; | |
214 | where = (LAST_BIT - where_in_line); | |
215 | map_index = where >> 2; | |
216 | map_offset = where & 0x3; | |
217 | map_val = map->dimm_map[map_index]; | |
218 | map_val = ((map_val >> ((3 - map_offset) << 1)) & (2 - 1)); | |
219 | ||
220 | sprintf(buf, "%s, pin %3d", | |
221 | prop->dimm_labels[first_dimm + map_val], | |
222 | map->pin_map[where_in_line]); | |
223 | } else { | |
224 | int dimm; | |
225 | ||
226 | /* Multi-bit error, we just dump out all the | |
227 | * dimm labels associated with this bank. | |
228 | */ | |
229 | for (dimm = 0; dimm < CHMCTRL_NDIMMS; dimm++) { | |
230 | sprintf(buf, "%s ", | |
231 | prop->dimm_labels[first_dimm + dimm]); | |
232 | buf += strlen(buf); | |
233 | } | |
234 | } | |
235 | return 0; | |
236 | } | |
237 | ||
238 | /* Accessing the registers is slightly complicated. If you want | |
239 | * to get at the memory controller which is on the same processor | |
240 | * the code is executing, you must use special ASI load/store else | |
241 | * you go through the global mapping. | |
242 | */ | |
243 | static u64 read_mcreg(struct mctrl_info *mp, unsigned long offset) | |
244 | { | |
245 | unsigned long ret; | |
246 | int this_cpu = get_cpu(); | |
247 | ||
248 | if (mp->portid == this_cpu) { | |
249 | __asm__ __volatile__("ldxa [%1] %2, %0" | |
250 | : "=r" (ret) | |
251 | : "r" (offset), "i" (ASI_MCU_CTRL_REG)); | |
252 | } else { | |
253 | __asm__ __volatile__("ldxa [%1] %2, %0" | |
254 | : "=r" (ret) | |
255 | : "r" (mp->regs + offset), | |
256 | "i" (ASI_PHYS_BYPASS_EC_E)); | |
257 | } | |
258 | put_cpu(); | |
259 | ||
260 | return ret; | |
261 | } | |
262 | ||
263 | #if 0 /* currently unused */ | |
264 | static void write_mcreg(struct mctrl_info *mp, unsigned long offset, u64 val) | |
265 | { | |
266 | if (mp->portid == smp_processor_id()) { | |
267 | __asm__ __volatile__("stxa %0, [%1] %2" | |
268 | : : "r" (val), | |
269 | "r" (offset), "i" (ASI_MCU_CTRL_REG)); | |
270 | } else { | |
271 | __asm__ __volatile__("ldxa %0, [%1] %2" | |
272 | : : "r" (val), | |
273 | "r" (mp->regs + offset), | |
274 | "i" (ASI_PHYS_BYPASS_EC_E)); | |
275 | } | |
276 | } | |
277 | #endif | |
278 | ||
279 | static void interpret_one_decode_reg(struct mctrl_info *mp, int which_bank, u64 val) | |
280 | { | |
281 | struct bank_info *p = &mp->logical_banks[which_bank]; | |
282 | ||
283 | p->mp = mp; | |
284 | p->bank_id = (CHMCTRL_NBANKS * mp->portid) + which_bank; | |
285 | p->raw_reg = val; | |
286 | p->valid = (val & MEM_DECODE_VALID) >> MEM_DECODE_VALID_SHIFT; | |
287 | p->uk = (val & MEM_DECODE_UK) >> MEM_DECODE_UK_SHIFT; | |
288 | p->um = (val & MEM_DECODE_UM) >> MEM_DECODE_UM_SHIFT; | |
289 | p->lk = (val & MEM_DECODE_LK) >> MEM_DECODE_LK_SHIFT; | |
290 | p->lm = (val & MEM_DECODE_LM) >> MEM_DECODE_LM_SHIFT; | |
291 | ||
292 | p->base = (p->um); | |
293 | p->base &= ~(p->uk); | |
294 | p->base <<= PA_UPPER_BITS_SHIFT; | |
295 | ||
296 | switch(p->lk) { | |
297 | case 0xf: | |
298 | default: | |
299 | p->interleave = 1; | |
300 | break; | |
301 | ||
302 | case 0xe: | |
303 | p->interleave = 2; | |
304 | break; | |
305 | ||
306 | case 0xc: | |
307 | p->interleave = 4; | |
308 | break; | |
309 | ||
310 | case 0x8: | |
311 | p->interleave = 8; | |
312 | break; | |
313 | ||
314 | case 0x0: | |
315 | p->interleave = 16; | |
316 | break; | |
317 | }; | |
318 | ||
319 | /* UK[10] is reserved, and UK[11] is not set for the SDRAM | |
320 | * bank size definition. | |
321 | */ | |
322 | p->size = (((unsigned long)p->uk & | |
323 | ((1UL << 10UL) - 1UL)) + 1UL) << PA_UPPER_BITS_SHIFT; | |
324 | p->size /= p->interleave; | |
325 | } | |
326 | ||
327 | static void fetch_decode_regs(struct mctrl_info *mp) | |
328 | { | |
329 | if (mp->layout_size == 0) | |
330 | return; | |
331 | ||
332 | interpret_one_decode_reg(mp, 0, | |
333 | read_mcreg(mp, CHMCTRL_DECODE1)); | |
334 | interpret_one_decode_reg(mp, 1, | |
335 | read_mcreg(mp, CHMCTRL_DECODE2)); | |
336 | interpret_one_decode_reg(mp, 2, | |
337 | read_mcreg(mp, CHMCTRL_DECODE3)); | |
338 | interpret_one_decode_reg(mp, 3, | |
339 | read_mcreg(mp, CHMCTRL_DECODE4)); | |
340 | } | |
341 | ||
342 | static int init_one_mctrl(int node, int index) | |
343 | { | |
344 | struct mctrl_info *mp = kmalloc(sizeof(*mp), GFP_KERNEL); | |
345 | int portid = prom_getintdefault(node, "portid", -1); | |
346 | struct linux_prom64_registers p_reg_prop; | |
347 | int t; | |
348 | ||
349 | if (!mp) | |
350 | return -1; | |
351 | memset(mp, 0, sizeof(*mp)); | |
352 | if (portid == -1) | |
353 | goto fail; | |
354 | ||
355 | mp->portid = portid; | |
356 | mp->layout_size = prom_getproplen(node, "memory-layout"); | |
357 | if (mp->layout_size < 0) | |
358 | mp->layout_size = 0; | |
359 | if (mp->layout_size > sizeof(mp->layout_prop)) | |
360 | goto fail; | |
361 | ||
362 | if (mp->layout_size > 0) | |
363 | prom_getproperty(node, "memory-layout", | |
364 | (char *) &mp->layout_prop, | |
365 | mp->layout_size); | |
366 | ||
367 | t = prom_getproperty(node, "reg", | |
368 | (char *) &p_reg_prop, | |
369 | sizeof(p_reg_prop)); | |
370 | if (t < 0 || p_reg_prop.reg_size != 0x48) | |
371 | goto fail; | |
372 | ||
373 | mp->regs = ioremap(p_reg_prop.phys_addr, p_reg_prop.reg_size); | |
374 | if (mp->regs == NULL) | |
375 | goto fail; | |
376 | ||
377 | if (mp->layout_size != 0UL) { | |
378 | mp->timing_control1 = read_mcreg(mp, CHMCTRL_TCTRL1); | |
379 | mp->timing_control2 = read_mcreg(mp, CHMCTRL_TCTRL2); | |
380 | mp->timing_control3 = read_mcreg(mp, CHMCTRL_TCTRL3); | |
381 | mp->timing_control4 = read_mcreg(mp, CHMCTRL_TCTRL4); | |
382 | mp->memaddr_control = read_mcreg(mp, CHMCTRL_MACTRL); | |
383 | } | |
384 | ||
385 | fetch_decode_regs(mp); | |
386 | ||
387 | mp->index = index; | |
388 | ||
389 | list_add(&mp->list, &mctrl_list); | |
390 | ||
391 | /* Report the device. */ | |
392 | printk(KERN_INFO "chmc%d: US3 memory controller at %p [%s]\n", | |
393 | mp->index, | |
394 | mp->regs, (mp->layout_size ? "ACTIVE" : "INACTIVE")); | |
395 | ||
396 | return 0; | |
397 | ||
398 | fail: | |
399 | if (mp) { | |
400 | if (mp->regs != NULL) | |
401 | iounmap(mp->regs); | |
402 | kfree(mp); | |
403 | } | |
404 | return -1; | |
405 | } | |
406 | ||
407 | static int __init probe_for_string(char *name, int index) | |
408 | { | |
409 | int node = prom_getchild(prom_root_node); | |
410 | ||
411 | while ((node = prom_searchsiblings(node, name)) != 0) { | |
412 | int ret = init_one_mctrl(node, index); | |
413 | ||
414 | if (!ret) | |
415 | index++; | |
416 | ||
417 | node = prom_getsibling(node); | |
418 | if (!node) | |
419 | break; | |
420 | } | |
421 | ||
422 | return index; | |
423 | } | |
424 | ||
425 | static int __init chmc_init(void) | |
426 | { | |
427 | int index; | |
428 | ||
429 | /* This driver is only for cheetah platforms. */ | |
430 | if (tlb_type != cheetah && tlb_type != cheetah_plus) | |
431 | return -ENODEV; | |
432 | ||
433 | index = probe_for_string("memory-controller", 0); | |
434 | index = probe_for_string("mc-us3", index); | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
439 | static void __exit chmc_cleanup(void) | |
440 | { | |
441 | struct list_head *head = &mctrl_list; | |
442 | struct list_head *tmp = head->next; | |
443 | ||
444 | for (;;) { | |
445 | struct mctrl_info *p = | |
446 | list_entry(tmp, struct mctrl_info, list); | |
447 | if (tmp == head) | |
448 | break; | |
449 | tmp = tmp->next; | |
450 | ||
451 | list_del(&p->list); | |
452 | iounmap(p->regs); | |
453 | kfree(p); | |
454 | } | |
455 | } | |
456 | ||
457 | module_init(chmc_init); | |
458 | module_exit(chmc_cleanup); |