Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * PowerMac G5 SMU driver | |
3 | * | |
4 | * Copyright 2004 J. Mayer <l_indien@magic.fr> | |
5 | * Copyright 2005 Benjamin Herrenschmidt, IBM Corp. | |
6 | * | |
7 | * Released under the term of the GNU GPL v2. | |
8 | */ | |
9 | ||
10 | /* | |
1da177e4 | 11 | * TODO: |
0365ba7f BH |
12 | * - maybe add timeout to commands ? |
13 | * - blocking version of time functions | |
14 | * - polling version of i2c commands (including timer that works with | |
15 | * interrutps off) | |
16 | * - maybe avoid some data copies with i2c by directly using the smu cmd | |
17 | * buffer and a lower level internal interface | |
18 | * - understand SMU -> CPU events and implement reception of them via | |
19 | * the userland interface | |
1da177e4 LT |
20 | */ |
21 | ||
22 | #include <linux/config.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/device.h> | |
26 | #include <linux/dmapool.h> | |
27 | #include <linux/bootmem.h> | |
28 | #include <linux/vmalloc.h> | |
29 | #include <linux/highmem.h> | |
30 | #include <linux/jiffies.h> | |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/rtc.h> | |
0365ba7f BH |
33 | #include <linux/completion.h> |
34 | #include <linux/miscdevice.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/sysdev.h> | |
37 | #include <linux/poll.h> | |
14cc3e2b | 38 | #include <linux/mutex.h> |
1da177e4 LT |
39 | |
40 | #include <asm/byteorder.h> | |
41 | #include <asm/io.h> | |
42 | #include <asm/prom.h> | |
43 | #include <asm/machdep.h> | |
44 | #include <asm/pmac_feature.h> | |
45 | #include <asm/smu.h> | |
46 | #include <asm/sections.h> | |
47 | #include <asm/abs_addr.h> | |
0365ba7f BH |
48 | #include <asm/uaccess.h> |
49 | #include <asm/of_device.h> | |
50 | ||
183d0202 | 51 | #define VERSION "0.7" |
0365ba7f | 52 | #define AUTHOR "(c) 2005 Benjamin Herrenschmidt, IBM Corp." |
1da177e4 | 53 | |
0365ba7f | 54 | #undef DEBUG_SMU |
1da177e4 LT |
55 | |
56 | #ifdef DEBUG_SMU | |
1beb6a7d | 57 | #define DPRINTK(fmt, args...) do { printk(KERN_DEBUG fmt , ##args); } while (0) |
1da177e4 LT |
58 | #else |
59 | #define DPRINTK(fmt, args...) do { } while (0) | |
60 | #endif | |
61 | ||
62 | /* | |
63 | * This is the command buffer passed to the SMU hardware | |
64 | */ | |
0365ba7f BH |
65 | #define SMU_MAX_DATA 254 |
66 | ||
1da177e4 LT |
67 | struct smu_cmd_buf { |
68 | u8 cmd; | |
69 | u8 length; | |
0365ba7f | 70 | u8 data[SMU_MAX_DATA]; |
1da177e4 LT |
71 | }; |
72 | ||
73 | struct smu_device { | |
74 | spinlock_t lock; | |
75 | struct device_node *of_node; | |
0365ba7f BH |
76 | struct of_device *of_dev; |
77 | int doorbell; /* doorbell gpio */ | |
1da177e4 | 78 | u32 __iomem *db_buf; /* doorbell buffer */ |
0365ba7f BH |
79 | int db_irq; |
80 | int msg; | |
81 | int msg_irq; | |
1da177e4 LT |
82 | struct smu_cmd_buf *cmd_buf; /* command buffer virtual */ |
83 | u32 cmd_buf_abs; /* command buffer absolute */ | |
0365ba7f BH |
84 | struct list_head cmd_list; |
85 | struct smu_cmd *cmd_cur; /* pending command */ | |
86 | struct list_head cmd_i2c_list; | |
87 | struct smu_i2c_cmd *cmd_i2c_cur; /* pending i2c command */ | |
88 | struct timer_list i2c_timer; | |
1da177e4 LT |
89 | }; |
90 | ||
91 | /* | |
92 | * I don't think there will ever be more than one SMU, so | |
93 | * for now, just hard code that | |
94 | */ | |
95 | static struct smu_device *smu; | |
14cc3e2b | 96 | static DEFINE_MUTEX(smu_part_access); |
0365ba7f | 97 | |
730745a5 BH |
98 | static void smu_i2c_retry(unsigned long data); |
99 | ||
1da177e4 | 100 | /* |
0365ba7f | 101 | * SMU driver low level stuff |
1da177e4 | 102 | */ |
1da177e4 | 103 | |
0365ba7f | 104 | static void smu_start_cmd(void) |
1da177e4 | 105 | { |
0365ba7f BH |
106 | unsigned long faddr, fend; |
107 | struct smu_cmd *cmd; | |
1da177e4 | 108 | |
0365ba7f BH |
109 | if (list_empty(&smu->cmd_list)) |
110 | return; | |
111 | ||
112 | /* Fetch first command in queue */ | |
113 | cmd = list_entry(smu->cmd_list.next, struct smu_cmd, link); | |
114 | smu->cmd_cur = cmd; | |
115 | list_del(&cmd->link); | |
116 | ||
117 | DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd->cmd, | |
118 | cmd->data_len); | |
183d0202 | 119 | DPRINTK("SMU: data buffer: %02x %02x %02x %02x %02x %02x %02x %02x\n", |
0365ba7f | 120 | ((u8 *)cmd->data_buf)[0], ((u8 *)cmd->data_buf)[1], |
183d0202 BH |
121 | ((u8 *)cmd->data_buf)[2], ((u8 *)cmd->data_buf)[3], |
122 | ((u8 *)cmd->data_buf)[4], ((u8 *)cmd->data_buf)[5], | |
123 | ((u8 *)cmd->data_buf)[6], ((u8 *)cmd->data_buf)[7]); | |
0365ba7f BH |
124 | |
125 | /* Fill the SMU command buffer */ | |
126 | smu->cmd_buf->cmd = cmd->cmd; | |
127 | smu->cmd_buf->length = cmd->data_len; | |
128 | memcpy(smu->cmd_buf->data, cmd->data_buf, cmd->data_len); | |
129 | ||
130 | /* Flush command and data to RAM */ | |
131 | faddr = (unsigned long)smu->cmd_buf; | |
132 | fend = faddr + smu->cmd_buf->length + 2; | |
133 | flush_inval_dcache_range(faddr, fend); | |
134 | ||
135 | /* This isn't exactly a DMA mapping here, I suspect | |
1da177e4 LT |
136 | * the SMU is actually communicating with us via i2c to the |
137 | * northbridge or the CPU to access RAM. | |
138 | */ | |
0365ba7f | 139 | writel(smu->cmd_buf_abs, smu->db_buf); |
1da177e4 LT |
140 | |
141 | /* Ring the SMU doorbell */ | |
0365ba7f | 142 | pmac_do_feature_call(PMAC_FTR_WRITE_GPIO, NULL, smu->doorbell, 4); |
1da177e4 LT |
143 | } |
144 | ||
0365ba7f BH |
145 | |
146 | static irqreturn_t smu_db_intr(int irq, void *arg, struct pt_regs *regs) | |
1da177e4 | 147 | { |
0365ba7f BH |
148 | unsigned long flags; |
149 | struct smu_cmd *cmd; | |
150 | void (*done)(struct smu_cmd *cmd, void *misc) = NULL; | |
151 | void *misc = NULL; | |
152 | u8 gpio; | |
153 | int rc = 0; | |
1da177e4 | 154 | |
0365ba7f BH |
155 | /* SMU completed the command, well, we hope, let's make sure |
156 | * of it | |
157 | */ | |
158 | spin_lock_irqsave(&smu->lock, flags); | |
1da177e4 | 159 | |
0365ba7f | 160 | gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell); |
a44fe13e BH |
161 | if ((gpio & 7) != 7) { |
162 | spin_unlock_irqrestore(&smu->lock, flags); | |
0365ba7f | 163 | return IRQ_HANDLED; |
a44fe13e | 164 | } |
0365ba7f BH |
165 | |
166 | cmd = smu->cmd_cur; | |
167 | smu->cmd_cur = NULL; | |
168 | if (cmd == NULL) | |
169 | goto bail; | |
170 | ||
171 | if (rc == 0) { | |
172 | unsigned long faddr; | |
173 | int reply_len; | |
174 | u8 ack; | |
175 | ||
176 | /* CPU might have brought back the cache line, so we need | |
177 | * to flush again before peeking at the SMU response. We | |
178 | * flush the entire buffer for now as we haven't read the | |
179 | * reply lenght (it's only 2 cache lines anyway) | |
180 | */ | |
181 | faddr = (unsigned long)smu->cmd_buf; | |
182 | flush_inval_dcache_range(faddr, faddr + 256); | |
183 | ||
184 | /* Now check ack */ | |
185 | ack = (~cmd->cmd) & 0xff; | |
186 | if (ack != smu->cmd_buf->cmd) { | |
187 | DPRINTK("SMU: incorrect ack, want %x got %x\n", | |
188 | ack, smu->cmd_buf->cmd); | |
189 | rc = -EIO; | |
190 | } | |
191 | reply_len = rc == 0 ? smu->cmd_buf->length : 0; | |
192 | DPRINTK("SMU: reply len: %d\n", reply_len); | |
193 | if (reply_len > cmd->reply_len) { | |
194 | printk(KERN_WARNING "SMU: reply buffer too small," | |
195 | "got %d bytes for a %d bytes buffer\n", | |
196 | reply_len, cmd->reply_len); | |
197 | reply_len = cmd->reply_len; | |
198 | } | |
199 | cmd->reply_len = reply_len; | |
200 | if (cmd->reply_buf && reply_len) | |
201 | memcpy(cmd->reply_buf, smu->cmd_buf->data, reply_len); | |
202 | } | |
203 | ||
204 | /* Now complete the command. Write status last in order as we lost | |
205 | * ownership of the command structure as soon as it's no longer -1 | |
206 | */ | |
207 | done = cmd->done; | |
208 | misc = cmd->misc; | |
209 | mb(); | |
210 | cmd->status = rc; | |
211 | bail: | |
212 | /* Start next command if any */ | |
213 | smu_start_cmd(); | |
214 | spin_unlock_irqrestore(&smu->lock, flags); | |
215 | ||
216 | /* Call command completion handler if any */ | |
217 | if (done) | |
218 | done(cmd, misc); | |
219 | ||
220 | /* It's an edge interrupt, nothing to do */ | |
221 | return IRQ_HANDLED; | |
1da177e4 LT |
222 | } |
223 | ||
0365ba7f BH |
224 | |
225 | static irqreturn_t smu_msg_intr(int irq, void *arg, struct pt_regs *regs) | |
1da177e4 | 226 | { |
0365ba7f BH |
227 | /* I don't quite know what to do with this one, we seem to never |
228 | * receive it, so I suspect we have to arm it someway in the SMU | |
229 | * to start getting events that way. | |
230 | */ | |
231 | ||
232 | printk(KERN_INFO "SMU: message interrupt !\n"); | |
1da177e4 | 233 | |
0365ba7f BH |
234 | /* It's an edge interrupt, nothing to do */ |
235 | return IRQ_HANDLED; | |
236 | } | |
1da177e4 | 237 | |
1da177e4 | 238 | |
0365ba7f BH |
239 | /* |
240 | * Queued command management. | |
241 | * | |
242 | */ | |
1da177e4 | 243 | |
0365ba7f BH |
244 | int smu_queue_cmd(struct smu_cmd *cmd) |
245 | { | |
246 | unsigned long flags; | |
1da177e4 | 247 | |
0365ba7f BH |
248 | if (smu == NULL) |
249 | return -ENODEV; | |
250 | if (cmd->data_len > SMU_MAX_DATA || | |
251 | cmd->reply_len > SMU_MAX_DATA) | |
252 | return -EINVAL; | |
253 | ||
254 | cmd->status = 1; | |
255 | spin_lock_irqsave(&smu->lock, flags); | |
256 | list_add_tail(&cmd->link, &smu->cmd_list); | |
257 | if (smu->cmd_cur == NULL) | |
258 | smu_start_cmd(); | |
259 | spin_unlock_irqrestore(&smu->lock, flags); | |
260 | ||
261 | return 0; | |
1da177e4 | 262 | } |
0365ba7f | 263 | EXPORT_SYMBOL(smu_queue_cmd); |
1da177e4 | 264 | |
0365ba7f BH |
265 | |
266 | int smu_queue_simple(struct smu_simple_cmd *scmd, u8 command, | |
267 | unsigned int data_len, | |
268 | void (*done)(struct smu_cmd *cmd, void *misc), | |
269 | void *misc, ...) | |
1da177e4 | 270 | { |
0365ba7f BH |
271 | struct smu_cmd *cmd = &scmd->cmd; |
272 | va_list list; | |
273 | int i; | |
274 | ||
275 | if (data_len > sizeof(scmd->buffer)) | |
276 | return -EINVAL; | |
277 | ||
278 | memset(scmd, 0, sizeof(*scmd)); | |
279 | cmd->cmd = command; | |
280 | cmd->data_len = data_len; | |
281 | cmd->data_buf = scmd->buffer; | |
282 | cmd->reply_len = sizeof(scmd->buffer); | |
283 | cmd->reply_buf = scmd->buffer; | |
284 | cmd->done = done; | |
285 | cmd->misc = misc; | |
286 | ||
287 | va_start(list, misc); | |
288 | for (i = 0; i < data_len; ++i) | |
289 | scmd->buffer[i] = (u8)va_arg(list, int); | |
290 | va_end(list); | |
291 | ||
292 | return smu_queue_cmd(cmd); | |
1da177e4 | 293 | } |
0365ba7f | 294 | EXPORT_SYMBOL(smu_queue_simple); |
1da177e4 | 295 | |
0365ba7f BH |
296 | |
297 | void smu_poll(void) | |
1da177e4 | 298 | { |
0365ba7f BH |
299 | u8 gpio; |
300 | ||
301 | if (smu == NULL) | |
302 | return; | |
303 | ||
304 | gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell); | |
305 | if ((gpio & 7) == 7) | |
306 | smu_db_intr(smu->db_irq, smu, NULL); | |
1da177e4 | 307 | } |
0365ba7f BH |
308 | EXPORT_SYMBOL(smu_poll); |
309 | ||
1da177e4 | 310 | |
0365ba7f | 311 | void smu_done_complete(struct smu_cmd *cmd, void *misc) |
1da177e4 | 312 | { |
0365ba7f BH |
313 | struct completion *comp = misc; |
314 | ||
315 | complete(comp); | |
1da177e4 | 316 | } |
0365ba7f BH |
317 | EXPORT_SYMBOL(smu_done_complete); |
318 | ||
1da177e4 | 319 | |
0365ba7f | 320 | void smu_spinwait_cmd(struct smu_cmd *cmd) |
1da177e4 | 321 | { |
0365ba7f BH |
322 | while(cmd->status == 1) |
323 | smu_poll(); | |
324 | } | |
325 | EXPORT_SYMBOL(smu_spinwait_cmd); | |
326 | ||
327 | ||
328 | /* RTC low level commands */ | |
329 | static inline int bcd2hex (int n) | |
330 | { | |
331 | return (((n & 0xf0) >> 4) * 10) + (n & 0xf); | |
1da177e4 LT |
332 | } |
333 | ||
0365ba7f BH |
334 | |
335 | static inline int hex2bcd (int n) | |
1da177e4 | 336 | { |
0365ba7f | 337 | return ((n / 10) << 4) + (n % 10); |
1da177e4 | 338 | } |
0365ba7f | 339 | |
1da177e4 LT |
340 | |
341 | static inline void smu_fill_set_rtc_cmd(struct smu_cmd_buf *cmd_buf, | |
342 | struct rtc_time *time) | |
343 | { | |
344 | cmd_buf->cmd = 0x8e; | |
345 | cmd_buf->length = 8; | |
346 | cmd_buf->data[0] = 0x80; | |
347 | cmd_buf->data[1] = hex2bcd(time->tm_sec); | |
348 | cmd_buf->data[2] = hex2bcd(time->tm_min); | |
349 | cmd_buf->data[3] = hex2bcd(time->tm_hour); | |
350 | cmd_buf->data[4] = time->tm_wday; | |
351 | cmd_buf->data[5] = hex2bcd(time->tm_mday); | |
352 | cmd_buf->data[6] = hex2bcd(time->tm_mon) + 1; | |
353 | cmd_buf->data[7] = hex2bcd(time->tm_year - 100); | |
354 | } | |
355 | ||
1da177e4 | 356 | |
0365ba7f | 357 | int smu_get_rtc_time(struct rtc_time *time, int spinwait) |
1da177e4 | 358 | { |
0365ba7f | 359 | struct smu_simple_cmd cmd; |
1da177e4 LT |
360 | int rc; |
361 | ||
362 | if (smu == NULL) | |
363 | return -ENODEV; | |
364 | ||
365 | memset(time, 0, sizeof(struct rtc_time)); | |
0365ba7f BH |
366 | rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 1, NULL, NULL, |
367 | SMU_CMD_RTC_GET_DATETIME); | |
368 | if (rc) | |
369 | return rc; | |
370 | smu_spinwait_simple(&cmd); | |
1da177e4 | 371 | |
0365ba7f BH |
372 | time->tm_sec = bcd2hex(cmd.buffer[0]); |
373 | time->tm_min = bcd2hex(cmd.buffer[1]); | |
374 | time->tm_hour = bcd2hex(cmd.buffer[2]); | |
375 | time->tm_wday = bcd2hex(cmd.buffer[3]); | |
376 | time->tm_mday = bcd2hex(cmd.buffer[4]); | |
377 | time->tm_mon = bcd2hex(cmd.buffer[5]) - 1; | |
378 | time->tm_year = bcd2hex(cmd.buffer[6]) + 100; | |
379 | ||
380 | return 0; | |
1da177e4 LT |
381 | } |
382 | ||
0365ba7f BH |
383 | |
384 | int smu_set_rtc_time(struct rtc_time *time, int spinwait) | |
1da177e4 | 385 | { |
0365ba7f | 386 | struct smu_simple_cmd cmd; |
1da177e4 LT |
387 | int rc; |
388 | ||
389 | if (smu == NULL) | |
390 | return -ENODEV; | |
391 | ||
0365ba7f BH |
392 | rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 8, NULL, NULL, |
393 | SMU_CMD_RTC_SET_DATETIME, | |
394 | hex2bcd(time->tm_sec), | |
395 | hex2bcd(time->tm_min), | |
396 | hex2bcd(time->tm_hour), | |
397 | time->tm_wday, | |
398 | hex2bcd(time->tm_mday), | |
399 | hex2bcd(time->tm_mon) + 1, | |
400 | hex2bcd(time->tm_year - 100)); | |
401 | if (rc) | |
402 | return rc; | |
403 | smu_spinwait_simple(&cmd); | |
1da177e4 | 404 | |
0365ba7f | 405 | return 0; |
1da177e4 LT |
406 | } |
407 | ||
0365ba7f | 408 | |
1da177e4 LT |
409 | void smu_shutdown(void) |
410 | { | |
0365ba7f | 411 | struct smu_simple_cmd cmd; |
1da177e4 LT |
412 | |
413 | if (smu == NULL) | |
414 | return; | |
415 | ||
0365ba7f BH |
416 | if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 9, NULL, NULL, |
417 | 'S', 'H', 'U', 'T', 'D', 'O', 'W', 'N', 0)) | |
418 | return; | |
419 | smu_spinwait_simple(&cmd); | |
1da177e4 LT |
420 | for (;;) |
421 | ; | |
1da177e4 LT |
422 | } |
423 | ||
0365ba7f | 424 | |
1da177e4 LT |
425 | void smu_restart(void) |
426 | { | |
0365ba7f | 427 | struct smu_simple_cmd cmd; |
1da177e4 LT |
428 | |
429 | if (smu == NULL) | |
430 | return; | |
431 | ||
0365ba7f BH |
432 | if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, NULL, NULL, |
433 | 'R', 'E', 'S', 'T', 'A', 'R', 'T', 0)) | |
434 | return; | |
435 | smu_spinwait_simple(&cmd); | |
1da177e4 LT |
436 | for (;;) |
437 | ; | |
1da177e4 LT |
438 | } |
439 | ||
0365ba7f | 440 | |
1da177e4 LT |
441 | int smu_present(void) |
442 | { | |
443 | return smu != NULL; | |
444 | } | |
0365ba7f | 445 | EXPORT_SYMBOL(smu_present); |
1da177e4 LT |
446 | |
447 | ||
183d0202 | 448 | int __init smu_init (void) |
1da177e4 LT |
449 | { |
450 | struct device_node *np; | |
451 | u32 *data; | |
452 | ||
453 | np = of_find_node_by_type(NULL, "smu"); | |
454 | if (np == NULL) | |
455 | return -ENODEV; | |
456 | ||
0365ba7f BH |
457 | printk(KERN_INFO "SMU driver %s %s\n", VERSION, AUTHOR); |
458 | ||
1da177e4 LT |
459 | if (smu_cmdbuf_abs == 0) { |
460 | printk(KERN_ERR "SMU: Command buffer not allocated !\n"); | |
461 | return -EINVAL; | |
462 | } | |
463 | ||
464 | smu = alloc_bootmem(sizeof(struct smu_device)); | |
465 | if (smu == NULL) | |
466 | return -ENOMEM; | |
467 | memset(smu, 0, sizeof(*smu)); | |
468 | ||
469 | spin_lock_init(&smu->lock); | |
0365ba7f BH |
470 | INIT_LIST_HEAD(&smu->cmd_list); |
471 | INIT_LIST_HEAD(&smu->cmd_i2c_list); | |
1da177e4 | 472 | smu->of_node = np; |
0365ba7f BH |
473 | smu->db_irq = NO_IRQ; |
474 | smu->msg_irq = NO_IRQ; | |
0365ba7f | 475 | |
1da177e4 LT |
476 | /* smu_cmdbuf_abs is in the low 2G of RAM, can be converted to a |
477 | * 32 bits value safely | |
478 | */ | |
479 | smu->cmd_buf_abs = (u32)smu_cmdbuf_abs; | |
480 | smu->cmd_buf = (struct smu_cmd_buf *)abs_to_virt(smu_cmdbuf_abs); | |
481 | ||
482 | np = of_find_node_by_name(NULL, "smu-doorbell"); | |
483 | if (np == NULL) { | |
484 | printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n"); | |
485 | goto fail; | |
486 | } | |
487 | data = (u32 *)get_property(np, "reg", NULL); | |
1da177e4 | 488 | if (data == NULL) { |
0365ba7f | 489 | of_node_put(np); |
1da177e4 LT |
490 | printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n"); |
491 | goto fail; | |
492 | } | |
493 | ||
494 | /* Current setup has one doorbell GPIO that does both doorbell | |
495 | * and ack. GPIOs are at 0x50, best would be to find that out | |
496 | * in the device-tree though. | |
497 | */ | |
0365ba7f BH |
498 | smu->doorbell = *data; |
499 | if (smu->doorbell < 0x50) | |
500 | smu->doorbell += 0x50; | |
501 | if (np->n_intrs > 0) | |
502 | smu->db_irq = np->intrs[0].line; | |
503 | ||
504 | of_node_put(np); | |
505 | ||
506 | /* Now look for the smu-interrupt GPIO */ | |
507 | do { | |
508 | np = of_find_node_by_name(NULL, "smu-interrupt"); | |
509 | if (np == NULL) | |
510 | break; | |
511 | data = (u32 *)get_property(np, "reg", NULL); | |
512 | if (data == NULL) { | |
513 | of_node_put(np); | |
514 | break; | |
515 | } | |
516 | smu->msg = *data; | |
517 | if (smu->msg < 0x50) | |
518 | smu->msg += 0x50; | |
519 | if (np->n_intrs > 0) | |
520 | smu->msg_irq = np->intrs[0].line; | |
521 | of_node_put(np); | |
522 | } while(0); | |
1da177e4 LT |
523 | |
524 | /* Doorbell buffer is currently hard-coded, I didn't find a proper | |
525 | * device-tree entry giving the address. Best would probably to use | |
526 | * an offset for K2 base though, but let's do it that way for now. | |
527 | */ | |
528 | smu->db_buf = ioremap(0x8000860c, 0x1000); | |
529 | if (smu->db_buf == NULL) { | |
530 | printk(KERN_ERR "SMU: Can't map doorbell buffer pointer !\n"); | |
531 | goto fail; | |
532 | } | |
533 | ||
534 | sys_ctrler = SYS_CTRLER_SMU; | |
535 | return 0; | |
536 | ||
537 | fail: | |
538 | smu = NULL; | |
539 | return -ENXIO; | |
540 | ||
541 | } | |
0365ba7f BH |
542 | |
543 | ||
544 | static int smu_late_init(void) | |
545 | { | |
546 | if (!smu) | |
547 | return 0; | |
548 | ||
730745a5 BH |
549 | init_timer(&smu->i2c_timer); |
550 | smu->i2c_timer.function = smu_i2c_retry; | |
551 | smu->i2c_timer.data = (unsigned long)smu; | |
552 | ||
0365ba7f BH |
553 | /* |
554 | * Try to request the interrupts | |
555 | */ | |
556 | ||
557 | if (smu->db_irq != NO_IRQ) { | |
558 | if (request_irq(smu->db_irq, smu_db_intr, | |
559 | SA_SHIRQ, "SMU doorbell", smu) < 0) { | |
560 | printk(KERN_WARNING "SMU: can't " | |
561 | "request interrupt %d\n", | |
562 | smu->db_irq); | |
563 | smu->db_irq = NO_IRQ; | |
564 | } | |
565 | } | |
566 | ||
567 | if (smu->msg_irq != NO_IRQ) { | |
568 | if (request_irq(smu->msg_irq, smu_msg_intr, | |
569 | SA_SHIRQ, "SMU message", smu) < 0) { | |
570 | printk(KERN_WARNING "SMU: can't " | |
571 | "request interrupt %d\n", | |
572 | smu->msg_irq); | |
573 | smu->msg_irq = NO_IRQ; | |
574 | } | |
575 | } | |
576 | ||
577 | return 0; | |
578 | } | |
730745a5 BH |
579 | /* This has to be before arch_initcall as the low i2c stuff relies on the |
580 | * above having been done before we reach arch_initcalls | |
581 | */ | |
582 | core_initcall(smu_late_init); | |
0365ba7f BH |
583 | |
584 | /* | |
585 | * sysfs visibility | |
586 | */ | |
587 | ||
588 | static void smu_expose_childs(void *unused) | |
589 | { | |
a28d3af2 BH |
590 | struct device_node *np; |
591 | ||
592 | for (np = NULL; (np = of_get_next_child(smu->of_node, np)) != NULL;) | |
75722d39 | 593 | if (device_is_compatible(np, "smu-sensors")) |
730745a5 BH |
594 | of_platform_device_create(np, "smu-sensors", |
595 | &smu->of_dev->dev); | |
0365ba7f BH |
596 | } |
597 | ||
598 | static DECLARE_WORK(smu_expose_childs_work, smu_expose_childs, NULL); | |
599 | ||
600 | static int smu_platform_probe(struct of_device* dev, | |
601 | const struct of_device_id *match) | |
602 | { | |
603 | if (!smu) | |
604 | return -ENODEV; | |
605 | smu->of_dev = dev; | |
606 | ||
607 | /* | |
608 | * Ok, we are matched, now expose all i2c busses. We have to defer | |
609 | * that unfortunately or it would deadlock inside the device model | |
610 | */ | |
611 | schedule_work(&smu_expose_childs_work); | |
612 | ||
613 | return 0; | |
614 | } | |
615 | ||
616 | static struct of_device_id smu_platform_match[] = | |
617 | { | |
618 | { | |
619 | .type = "smu", | |
620 | }, | |
621 | {}, | |
622 | }; | |
623 | ||
624 | static struct of_platform_driver smu_of_platform_driver = | |
625 | { | |
626 | .name = "smu", | |
627 | .match_table = smu_platform_match, | |
628 | .probe = smu_platform_probe, | |
629 | }; | |
630 | ||
631 | static int __init smu_init_sysfs(void) | |
632 | { | |
0365ba7f BH |
633 | /* |
634 | * Due to sysfs bogosity, a sysdev is not a real device, so | |
635 | * we should in fact create both if we want sysdev semantics | |
636 | * for power management. | |
637 | * For now, we don't power manage machines with an SMU chip, | |
638 | * I'm a bit too far from figuring out how that works with those | |
639 | * new chipsets, but that will come back and bite us | |
640 | */ | |
6ea671a1 | 641 | of_register_driver(&smu_of_platform_driver); |
0365ba7f BH |
642 | return 0; |
643 | } | |
644 | ||
645 | device_initcall(smu_init_sysfs); | |
646 | ||
647 | struct of_device *smu_get_ofdev(void) | |
648 | { | |
649 | if (!smu) | |
650 | return NULL; | |
651 | return smu->of_dev; | |
652 | } | |
653 | ||
654 | EXPORT_SYMBOL_GPL(smu_get_ofdev); | |
655 | ||
656 | /* | |
657 | * i2c interface | |
658 | */ | |
659 | ||
660 | static void smu_i2c_complete_command(struct smu_i2c_cmd *cmd, int fail) | |
661 | { | |
662 | void (*done)(struct smu_i2c_cmd *cmd, void *misc) = cmd->done; | |
663 | void *misc = cmd->misc; | |
664 | unsigned long flags; | |
665 | ||
666 | /* Check for read case */ | |
667 | if (!fail && cmd->read) { | |
668 | if (cmd->pdata[0] < 1) | |
669 | fail = 1; | |
670 | else | |
671 | memcpy(cmd->info.data, &cmd->pdata[1], | |
672 | cmd->info.datalen); | |
673 | } | |
674 | ||
675 | DPRINTK("SMU: completing, success: %d\n", !fail); | |
676 | ||
677 | /* Update status and mark no pending i2c command with lock | |
678 | * held so nobody comes in while we dequeue an eventual | |
679 | * pending next i2c command | |
680 | */ | |
681 | spin_lock_irqsave(&smu->lock, flags); | |
682 | smu->cmd_i2c_cur = NULL; | |
683 | wmb(); | |
684 | cmd->status = fail ? -EIO : 0; | |
685 | ||
686 | /* Is there another i2c command waiting ? */ | |
687 | if (!list_empty(&smu->cmd_i2c_list)) { | |
688 | struct smu_i2c_cmd *newcmd; | |
689 | ||
690 | /* Fetch it, new current, remove from list */ | |
691 | newcmd = list_entry(smu->cmd_i2c_list.next, | |
692 | struct smu_i2c_cmd, link); | |
693 | smu->cmd_i2c_cur = newcmd; | |
694 | list_del(&cmd->link); | |
695 | ||
696 | /* Queue with low level smu */ | |
697 | list_add_tail(&cmd->scmd.link, &smu->cmd_list); | |
698 | if (smu->cmd_cur == NULL) | |
699 | smu_start_cmd(); | |
700 | } | |
701 | spin_unlock_irqrestore(&smu->lock, flags); | |
702 | ||
703 | /* Call command completion handler if any */ | |
704 | if (done) | |
705 | done(cmd, misc); | |
706 | ||
707 | } | |
708 | ||
709 | ||
710 | static void smu_i2c_retry(unsigned long data) | |
711 | { | |
730745a5 | 712 | struct smu_i2c_cmd *cmd = smu->cmd_i2c_cur; |
0365ba7f BH |
713 | |
714 | DPRINTK("SMU: i2c failure, requeuing...\n"); | |
715 | ||
716 | /* requeue command simply by resetting reply_len */ | |
717 | cmd->pdata[0] = 0xff; | |
730745a5 | 718 | cmd->scmd.reply_len = sizeof(cmd->pdata); |
0365ba7f BH |
719 | smu_queue_cmd(&cmd->scmd); |
720 | } | |
721 | ||
722 | ||
723 | static void smu_i2c_low_completion(struct smu_cmd *scmd, void *misc) | |
724 | { | |
725 | struct smu_i2c_cmd *cmd = misc; | |
726 | int fail = 0; | |
727 | ||
728 | DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n", | |
729 | cmd->stage, scmd->status, cmd->pdata[0], scmd->reply_len); | |
730 | ||
731 | /* Check for possible status */ | |
732 | if (scmd->status < 0) | |
733 | fail = 1; | |
734 | else if (cmd->read) { | |
735 | if (cmd->stage == 0) | |
736 | fail = cmd->pdata[0] != 0; | |
737 | else | |
738 | fail = cmd->pdata[0] >= 0x80; | |
739 | } else { | |
740 | fail = cmd->pdata[0] != 0; | |
741 | } | |
742 | ||
743 | /* Handle failures by requeuing command, after 5ms interval | |
744 | */ | |
745 | if (fail && --cmd->retries > 0) { | |
746 | DPRINTK("SMU: i2c failure, starting timer...\n"); | |
730745a5 BH |
747 | BUG_ON(cmd != smu->cmd_i2c_cur); |
748 | mod_timer(&smu->i2c_timer, jiffies + msecs_to_jiffies(5)); | |
0365ba7f BH |
749 | return; |
750 | } | |
751 | ||
752 | /* If failure or stage 1, command is complete */ | |
753 | if (fail || cmd->stage != 0) { | |
754 | smu_i2c_complete_command(cmd, fail); | |
755 | return; | |
756 | } | |
757 | ||
758 | DPRINTK("SMU: going to stage 1\n"); | |
759 | ||
760 | /* Ok, initial command complete, now poll status */ | |
761 | scmd->reply_buf = cmd->pdata; | |
730745a5 | 762 | scmd->reply_len = sizeof(cmd->pdata); |
0365ba7f BH |
763 | scmd->data_buf = cmd->pdata; |
764 | scmd->data_len = 1; | |
765 | cmd->pdata[0] = 0; | |
766 | cmd->stage = 1; | |
767 | cmd->retries = 20; | |
768 | smu_queue_cmd(scmd); | |
769 | } | |
770 | ||
771 | ||
772 | int smu_queue_i2c(struct smu_i2c_cmd *cmd) | |
773 | { | |
774 | unsigned long flags; | |
775 | ||
776 | if (smu == NULL) | |
777 | return -ENODEV; | |
778 | ||
779 | /* Fill most fields of scmd */ | |
780 | cmd->scmd.cmd = SMU_CMD_I2C_COMMAND; | |
781 | cmd->scmd.done = smu_i2c_low_completion; | |
782 | cmd->scmd.misc = cmd; | |
783 | cmd->scmd.reply_buf = cmd->pdata; | |
730745a5 | 784 | cmd->scmd.reply_len = sizeof(cmd->pdata); |
0365ba7f BH |
785 | cmd->scmd.data_buf = (u8 *)(char *)&cmd->info; |
786 | cmd->scmd.status = 1; | |
787 | cmd->stage = 0; | |
788 | cmd->pdata[0] = 0xff; | |
789 | cmd->retries = 20; | |
790 | cmd->status = 1; | |
791 | ||
792 | /* Check transfer type, sanitize some "info" fields | |
793 | * based on transfer type and do more checking | |
794 | */ | |
795 | cmd->info.caddr = cmd->info.devaddr; | |
796 | cmd->read = cmd->info.devaddr & 0x01; | |
797 | switch(cmd->info.type) { | |
798 | case SMU_I2C_TRANSFER_SIMPLE: | |
799 | memset(&cmd->info.sublen, 0, 4); | |
800 | break; | |
801 | case SMU_I2C_TRANSFER_COMBINED: | |
802 | cmd->info.devaddr &= 0xfe; | |
803 | case SMU_I2C_TRANSFER_STDSUB: | |
804 | if (cmd->info.sublen > 3) | |
805 | return -EINVAL; | |
806 | break; | |
807 | default: | |
808 | return -EINVAL; | |
809 | } | |
810 | ||
811 | /* Finish setting up command based on transfer direction | |
812 | */ | |
813 | if (cmd->read) { | |
814 | if (cmd->info.datalen > SMU_I2C_READ_MAX) | |
815 | return -EINVAL; | |
816 | memset(cmd->info.data, 0xff, cmd->info.datalen); | |
817 | cmd->scmd.data_len = 9; | |
818 | } else { | |
819 | if (cmd->info.datalen > SMU_I2C_WRITE_MAX) | |
820 | return -EINVAL; | |
821 | cmd->scmd.data_len = 9 + cmd->info.datalen; | |
822 | } | |
823 | ||
824 | DPRINTK("SMU: i2c enqueuing command\n"); | |
825 | DPRINTK("SMU: %s, len=%d bus=%x addr=%x sub0=%x type=%x\n", | |
826 | cmd->read ? "read" : "write", cmd->info.datalen, | |
827 | cmd->info.bus, cmd->info.caddr, | |
828 | cmd->info.subaddr[0], cmd->info.type); | |
829 | ||
830 | ||
831 | /* Enqueue command in i2c list, and if empty, enqueue also in | |
832 | * main command list | |
833 | */ | |
834 | spin_lock_irqsave(&smu->lock, flags); | |
835 | if (smu->cmd_i2c_cur == NULL) { | |
836 | smu->cmd_i2c_cur = cmd; | |
837 | list_add_tail(&cmd->scmd.link, &smu->cmd_list); | |
838 | if (smu->cmd_cur == NULL) | |
839 | smu_start_cmd(); | |
840 | } else | |
841 | list_add_tail(&cmd->link, &smu->cmd_i2c_list); | |
842 | spin_unlock_irqrestore(&smu->lock, flags); | |
843 | ||
844 | return 0; | |
845 | } | |
846 | ||
183d0202 BH |
847 | /* |
848 | * Handling of "partitions" | |
849 | */ | |
850 | ||
851 | static int smu_read_datablock(u8 *dest, unsigned int addr, unsigned int len) | |
852 | { | |
853 | DECLARE_COMPLETION(comp); | |
854 | unsigned int chunk; | |
855 | struct smu_cmd cmd; | |
856 | int rc; | |
857 | u8 params[8]; | |
858 | ||
859 | /* We currently use a chunk size of 0xe. We could check the | |
860 | * SMU firmware version and use bigger sizes though | |
861 | */ | |
862 | chunk = 0xe; | |
863 | ||
864 | while (len) { | |
865 | unsigned int clen = min(len, chunk); | |
866 | ||
867 | cmd.cmd = SMU_CMD_MISC_ee_COMMAND; | |
868 | cmd.data_len = 7; | |
869 | cmd.data_buf = params; | |
870 | cmd.reply_len = chunk; | |
871 | cmd.reply_buf = dest; | |
872 | cmd.done = smu_done_complete; | |
873 | cmd.misc = ∁ | |
874 | params[0] = SMU_CMD_MISC_ee_GET_DATABLOCK_REC; | |
875 | params[1] = 0x4; | |
876 | *((u32 *)¶ms[2]) = addr; | |
877 | params[6] = clen; | |
878 | ||
879 | rc = smu_queue_cmd(&cmd); | |
880 | if (rc) | |
881 | return rc; | |
882 | wait_for_completion(&comp); | |
883 | if (cmd.status != 0) | |
884 | return rc; | |
885 | if (cmd.reply_len != clen) { | |
886 | printk(KERN_DEBUG "SMU: short read in " | |
887 | "smu_read_datablock, got: %d, want: %d\n", | |
888 | cmd.reply_len, clen); | |
889 | return -EIO; | |
890 | } | |
891 | len -= clen; | |
892 | addr += clen; | |
893 | dest += clen; | |
894 | } | |
895 | return 0; | |
896 | } | |
897 | ||
898 | static struct smu_sdbp_header *smu_create_sdb_partition(int id) | |
899 | { | |
900 | DECLARE_COMPLETION(comp); | |
901 | struct smu_simple_cmd cmd; | |
902 | unsigned int addr, len, tlen; | |
903 | struct smu_sdbp_header *hdr; | |
904 | struct property *prop; | |
905 | ||
906 | /* First query the partition info */ | |
1beb6a7d | 907 | DPRINTK("SMU: Query partition infos ... (irq=%d)\n", smu->db_irq); |
183d0202 BH |
908 | smu_queue_simple(&cmd, SMU_CMD_PARTITION_COMMAND, 2, |
909 | smu_done_complete, &comp, | |
910 | SMU_CMD_PARTITION_LATEST, id); | |
911 | wait_for_completion(&comp); | |
1beb6a7d BH |
912 | DPRINTK("SMU: done, status: %d, reply_len: %d\n", |
913 | cmd.cmd.status, cmd.cmd.reply_len); | |
183d0202 BH |
914 | |
915 | /* Partition doesn't exist (or other error) */ | |
916 | if (cmd.cmd.status != 0 || cmd.cmd.reply_len != 6) | |
917 | return NULL; | |
918 | ||
919 | /* Fetch address and length from reply */ | |
920 | addr = *((u16 *)cmd.buffer); | |
921 | len = cmd.buffer[3] << 2; | |
922 | /* Calucluate total length to allocate, including the 17 bytes | |
923 | * for "sdb-partition-XX" that we append at the end of the buffer | |
924 | */ | |
925 | tlen = sizeof(struct property) + len + 18; | |
926 | ||
927 | prop = kcalloc(tlen, 1, GFP_KERNEL); | |
928 | if (prop == NULL) | |
929 | return NULL; | |
930 | hdr = (struct smu_sdbp_header *)(prop + 1); | |
931 | prop->name = ((char *)prop) + tlen - 18; | |
932 | sprintf(prop->name, "sdb-partition-%02x", id); | |
933 | prop->length = len; | |
934 | prop->value = (unsigned char *)hdr; | |
935 | prop->next = NULL; | |
936 | ||
937 | /* Read the datablock */ | |
938 | if (smu_read_datablock((u8 *)hdr, addr, len)) { | |
939 | printk(KERN_DEBUG "SMU: datablock read failed while reading " | |
940 | "partition %02x !\n", id); | |
941 | goto failure; | |
942 | } | |
943 | ||
944 | /* Got it, check a few things and create the property */ | |
945 | if (hdr->id != id) { | |
946 | printk(KERN_DEBUG "SMU: Reading partition %02x and got " | |
947 | "%02x !\n", id, hdr->id); | |
948 | goto failure; | |
949 | } | |
950 | if (prom_add_property(smu->of_node, prop)) { | |
951 | printk(KERN_DEBUG "SMU: Failed creating sdb-partition-%02x " | |
952 | "property !\n", id); | |
953 | goto failure; | |
954 | } | |
955 | ||
956 | return hdr; | |
957 | failure: | |
958 | kfree(prop); | |
959 | return NULL; | |
960 | } | |
961 | ||
962 | /* Note: Only allowed to return error code in pointers (using ERR_PTR) | |
963 | * when interruptible is 1 | |
964 | */ | |
965 | struct smu_sdbp_header *__smu_get_sdb_partition(int id, unsigned int *size, | |
966 | int interruptible) | |
4350147a BH |
967 | { |
968 | char pname[32]; | |
183d0202 | 969 | struct smu_sdbp_header *part; |
4350147a BH |
970 | |
971 | if (!smu) | |
972 | return NULL; | |
973 | ||
974 | sprintf(pname, "sdb-partition-%02x", id); | |
183d0202 | 975 | |
1beb6a7d BH |
976 | DPRINTK("smu_get_sdb_partition(%02x)\n", id); |
977 | ||
183d0202 BH |
978 | if (interruptible) { |
979 | int rc; | |
14cc3e2b | 980 | rc = mutex_lock_interruptible(&smu_part_access); |
183d0202 BH |
981 | if (rc) |
982 | return ERR_PTR(rc); | |
983 | } else | |
14cc3e2b | 984 | mutex_lock(&smu_part_access); |
183d0202 BH |
985 | |
986 | part = (struct smu_sdbp_header *)get_property(smu->of_node, | |
4350147a | 987 | pname, size); |
183d0202 | 988 | if (part == NULL) { |
1beb6a7d | 989 | DPRINTK("trying to extract from SMU ...\n"); |
183d0202 BH |
990 | part = smu_create_sdb_partition(id); |
991 | if (part != NULL && size) | |
992 | *size = part->len << 2; | |
993 | } | |
14cc3e2b | 994 | mutex_unlock(&smu_part_access); |
183d0202 BH |
995 | return part; |
996 | } | |
997 | ||
998 | struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size) | |
999 | { | |
1000 | return __smu_get_sdb_partition(id, size, 0); | |
4350147a BH |
1001 | } |
1002 | EXPORT_SYMBOL(smu_get_sdb_partition); | |
0365ba7f BH |
1003 | |
1004 | ||
1005 | /* | |
1006 | * Userland driver interface | |
1007 | */ | |
1008 | ||
1009 | ||
1010 | static LIST_HEAD(smu_clist); | |
1011 | static DEFINE_SPINLOCK(smu_clist_lock); | |
1012 | ||
1013 | enum smu_file_mode { | |
1014 | smu_file_commands, | |
1015 | smu_file_events, | |
1016 | smu_file_closing | |
1017 | }; | |
1018 | ||
1019 | struct smu_private | |
1020 | { | |
1021 | struct list_head list; | |
1022 | enum smu_file_mode mode; | |
1023 | int busy; | |
1024 | struct smu_cmd cmd; | |
1025 | spinlock_t lock; | |
1026 | wait_queue_head_t wait; | |
1027 | u8 buffer[SMU_MAX_DATA]; | |
1028 | }; | |
1029 | ||
1030 | ||
1031 | static int smu_open(struct inode *inode, struct file *file) | |
1032 | { | |
1033 | struct smu_private *pp; | |
1034 | unsigned long flags; | |
1035 | ||
1036 | pp = kmalloc(sizeof(struct smu_private), GFP_KERNEL); | |
1037 | if (pp == 0) | |
1038 | return -ENOMEM; | |
1039 | memset(pp, 0, sizeof(struct smu_private)); | |
1040 | spin_lock_init(&pp->lock); | |
1041 | pp->mode = smu_file_commands; | |
1042 | init_waitqueue_head(&pp->wait); | |
1043 | ||
1044 | spin_lock_irqsave(&smu_clist_lock, flags); | |
1045 | list_add(&pp->list, &smu_clist); | |
1046 | spin_unlock_irqrestore(&smu_clist_lock, flags); | |
1047 | file->private_data = pp; | |
1048 | ||
1049 | return 0; | |
1050 | } | |
1051 | ||
1052 | ||
1053 | static void smu_user_cmd_done(struct smu_cmd *cmd, void *misc) | |
1054 | { | |
1055 | struct smu_private *pp = misc; | |
1056 | ||
1057 | wake_up_all(&pp->wait); | |
1058 | } | |
1059 | ||
1060 | ||
1061 | static ssize_t smu_write(struct file *file, const char __user *buf, | |
1062 | size_t count, loff_t *ppos) | |
1063 | { | |
1064 | struct smu_private *pp = file->private_data; | |
1065 | unsigned long flags; | |
1066 | struct smu_user_cmd_hdr hdr; | |
1067 | int rc = 0; | |
1068 | ||
1069 | if (pp->busy) | |
1070 | return -EBUSY; | |
1071 | else if (copy_from_user(&hdr, buf, sizeof(hdr))) | |
1072 | return -EFAULT; | |
1073 | else if (hdr.cmdtype == SMU_CMDTYPE_WANTS_EVENTS) { | |
1074 | pp->mode = smu_file_events; | |
1075 | return 0; | |
183d0202 BH |
1076 | } else if (hdr.cmdtype == SMU_CMDTYPE_GET_PARTITION) { |
1077 | struct smu_sdbp_header *part; | |
1078 | part = __smu_get_sdb_partition(hdr.cmd, NULL, 1); | |
1079 | if (part == NULL) | |
1080 | return -EINVAL; | |
1081 | else if (IS_ERR(part)) | |
1082 | return PTR_ERR(part); | |
1083 | return 0; | |
0365ba7f BH |
1084 | } else if (hdr.cmdtype != SMU_CMDTYPE_SMU) |
1085 | return -EINVAL; | |
1086 | else if (pp->mode != smu_file_commands) | |
1087 | return -EBADFD; | |
1088 | else if (hdr.data_len > SMU_MAX_DATA) | |
1089 | return -EINVAL; | |
1090 | ||
1091 | spin_lock_irqsave(&pp->lock, flags); | |
1092 | if (pp->busy) { | |
1093 | spin_unlock_irqrestore(&pp->lock, flags); | |
1094 | return -EBUSY; | |
1095 | } | |
1096 | pp->busy = 1; | |
1097 | pp->cmd.status = 1; | |
1098 | spin_unlock_irqrestore(&pp->lock, flags); | |
1099 | ||
1100 | if (copy_from_user(pp->buffer, buf + sizeof(hdr), hdr.data_len)) { | |
1101 | pp->busy = 0; | |
1102 | return -EFAULT; | |
1103 | } | |
1104 | ||
1105 | pp->cmd.cmd = hdr.cmd; | |
1106 | pp->cmd.data_len = hdr.data_len; | |
1107 | pp->cmd.reply_len = SMU_MAX_DATA; | |
1108 | pp->cmd.data_buf = pp->buffer; | |
1109 | pp->cmd.reply_buf = pp->buffer; | |
1110 | pp->cmd.done = smu_user_cmd_done; | |
1111 | pp->cmd.misc = pp; | |
1112 | rc = smu_queue_cmd(&pp->cmd); | |
1113 | if (rc < 0) | |
1114 | return rc; | |
1115 | return count; | |
1116 | } | |
1117 | ||
1118 | ||
1119 | static ssize_t smu_read_command(struct file *file, struct smu_private *pp, | |
1120 | char __user *buf, size_t count) | |
1121 | { | |
1122 | DECLARE_WAITQUEUE(wait, current); | |
1123 | struct smu_user_reply_hdr hdr; | |
1124 | unsigned long flags; | |
1125 | int size, rc = 0; | |
1126 | ||
1127 | if (!pp->busy) | |
1128 | return 0; | |
1129 | if (count < sizeof(struct smu_user_reply_hdr)) | |
1130 | return -EOVERFLOW; | |
1131 | spin_lock_irqsave(&pp->lock, flags); | |
1132 | if (pp->cmd.status == 1) { | |
1133 | if (file->f_flags & O_NONBLOCK) | |
1134 | return -EAGAIN; | |
1135 | add_wait_queue(&pp->wait, &wait); | |
1136 | for (;;) { | |
1137 | set_current_state(TASK_INTERRUPTIBLE); | |
1138 | rc = 0; | |
1139 | if (pp->cmd.status != 1) | |
1140 | break; | |
1141 | rc = -ERESTARTSYS; | |
1142 | if (signal_pending(current)) | |
1143 | break; | |
1144 | spin_unlock_irqrestore(&pp->lock, flags); | |
1145 | schedule(); | |
1146 | spin_lock_irqsave(&pp->lock, flags); | |
1147 | } | |
1148 | set_current_state(TASK_RUNNING); | |
1149 | remove_wait_queue(&pp->wait, &wait); | |
1150 | } | |
1151 | spin_unlock_irqrestore(&pp->lock, flags); | |
1152 | if (rc) | |
1153 | return rc; | |
1154 | if (pp->cmd.status != 0) | |
1155 | pp->cmd.reply_len = 0; | |
1156 | size = sizeof(hdr) + pp->cmd.reply_len; | |
1157 | if (count < size) | |
1158 | size = count; | |
1159 | rc = size; | |
1160 | hdr.status = pp->cmd.status; | |
1161 | hdr.reply_len = pp->cmd.reply_len; | |
1162 | if (copy_to_user(buf, &hdr, sizeof(hdr))) | |
1163 | return -EFAULT; | |
1164 | size -= sizeof(hdr); | |
1165 | if (size && copy_to_user(buf + sizeof(hdr), pp->buffer, size)) | |
1166 | return -EFAULT; | |
1167 | pp->busy = 0; | |
1168 | ||
1169 | return rc; | |
1170 | } | |
1171 | ||
1172 | ||
1173 | static ssize_t smu_read_events(struct file *file, struct smu_private *pp, | |
1174 | char __user *buf, size_t count) | |
1175 | { | |
1176 | /* Not implemented */ | |
1177 | msleep_interruptible(1000); | |
1178 | return 0; | |
1179 | } | |
1180 | ||
1181 | ||
1182 | static ssize_t smu_read(struct file *file, char __user *buf, | |
1183 | size_t count, loff_t *ppos) | |
1184 | { | |
1185 | struct smu_private *pp = file->private_data; | |
1186 | ||
1187 | if (pp->mode == smu_file_commands) | |
1188 | return smu_read_command(file, pp, buf, count); | |
1189 | if (pp->mode == smu_file_events) | |
1190 | return smu_read_events(file, pp, buf, count); | |
1191 | ||
1192 | return -EBADFD; | |
1193 | } | |
1194 | ||
1195 | static unsigned int smu_fpoll(struct file *file, poll_table *wait) | |
1196 | { | |
1197 | struct smu_private *pp = file->private_data; | |
1198 | unsigned int mask = 0; | |
1199 | unsigned long flags; | |
1200 | ||
1201 | if (pp == 0) | |
1202 | return 0; | |
1203 | ||
1204 | if (pp->mode == smu_file_commands) { | |
1205 | poll_wait(file, &pp->wait, wait); | |
1206 | ||
1207 | spin_lock_irqsave(&pp->lock, flags); | |
1208 | if (pp->busy && pp->cmd.status != 1) | |
1209 | mask |= POLLIN; | |
1210 | spin_unlock_irqrestore(&pp->lock, flags); | |
1211 | } if (pp->mode == smu_file_events) { | |
1212 | /* Not yet implemented */ | |
1213 | } | |
1214 | return mask; | |
1215 | } | |
1216 | ||
1217 | static int smu_release(struct inode *inode, struct file *file) | |
1218 | { | |
1219 | struct smu_private *pp = file->private_data; | |
1220 | unsigned long flags; | |
1221 | unsigned int busy; | |
1222 | ||
1223 | if (pp == 0) | |
1224 | return 0; | |
1225 | ||
1226 | file->private_data = NULL; | |
1227 | ||
1228 | /* Mark file as closing to avoid races with new request */ | |
1229 | spin_lock_irqsave(&pp->lock, flags); | |
1230 | pp->mode = smu_file_closing; | |
1231 | busy = pp->busy; | |
1232 | ||
1233 | /* Wait for any pending request to complete */ | |
1234 | if (busy && pp->cmd.status == 1) { | |
1235 | DECLARE_WAITQUEUE(wait, current); | |
1236 | ||
1237 | add_wait_queue(&pp->wait, &wait); | |
1238 | for (;;) { | |
1239 | set_current_state(TASK_UNINTERRUPTIBLE); | |
1240 | if (pp->cmd.status != 1) | |
1241 | break; | |
1242 | spin_lock_irqsave(&pp->lock, flags); | |
1243 | schedule(); | |
1244 | spin_unlock_irqrestore(&pp->lock, flags); | |
1245 | } | |
1246 | set_current_state(TASK_RUNNING); | |
1247 | remove_wait_queue(&pp->wait, &wait); | |
1248 | } | |
1249 | spin_unlock_irqrestore(&pp->lock, flags); | |
1250 | ||
1251 | spin_lock_irqsave(&smu_clist_lock, flags); | |
1252 | list_del(&pp->list); | |
1253 | spin_unlock_irqrestore(&smu_clist_lock, flags); | |
1254 | kfree(pp); | |
1255 | ||
1256 | return 0; | |
1257 | } | |
1258 | ||
1259 | ||
6b67f62c | 1260 | static struct file_operations smu_device_fops = { |
0365ba7f BH |
1261 | .llseek = no_llseek, |
1262 | .read = smu_read, | |
1263 | .write = smu_write, | |
1264 | .poll = smu_fpoll, | |
1265 | .open = smu_open, | |
1266 | .release = smu_release, | |
1267 | }; | |
1268 | ||
6b67f62c | 1269 | static struct miscdevice pmu_device = { |
0365ba7f BH |
1270 | MISC_DYNAMIC_MINOR, "smu", &smu_device_fops |
1271 | }; | |
1272 | ||
1273 | static int smu_device_init(void) | |
1274 | { | |
1275 | if (!smu) | |
1276 | return -ENODEV; | |
1277 | if (misc_register(&pmu_device) < 0) | |
1278 | printk(KERN_ERR "via-pmu: cannot register misc device.\n"); | |
1279 | return 0; | |
1280 | } | |
1281 | device_initcall(smu_device_init); |