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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * TODO:
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070012 * - 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 */
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/types.h>
23#include <linux/kernel.h>
24#include <linux/device.h>
25#include <linux/dmapool.h>
26#include <linux/bootmem.h>
27#include <linux/vmalloc.h>
28#include <linux/highmem.h>
29#include <linux/jiffies.h>
30#include <linux/interrupt.h>
31#include <linux/rtc.h>
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070032#include <linux/completion.h>
33#include <linux/miscdevice.h>
34#include <linux/delay.h>
35#include <linux/sysdev.h>
36#include <linux/poll.h>
Ingo Molnar14cc3e22006-03-26 01:37:14 -080037#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <asm/byteorder.h>
40#include <asm/io.h>
41#include <asm/prom.h>
42#include <asm/machdep.h>
43#include <asm/pmac_feature.h>
44#include <asm/smu.h>
45#include <asm/sections.h>
46#include <asm/abs_addr.h>
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070047#include <asm/uaccess.h>
48#include <asm/of_device.h>
Benjamin Herrenschmidt7eebde72006-11-11 17:24:59 +110049#include <asm/of_platform.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +110051#define VERSION "0.7"
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070052#define AUTHOR "(c) 2005 Benjamin Herrenschmidt, IBM Corp."
53
54#undef DEBUG_SMU
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56#ifdef DEBUG_SMU
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +110057#define DPRINTK(fmt, args...) do { printk(KERN_DEBUG fmt , ##args); } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#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 */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070065#define SMU_MAX_DATA 254
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067struct smu_cmd_buf {
68 u8 cmd;
69 u8 length;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070070 u8 data[SMU_MAX_DATA];
Linus Torvalds1da177e2005-04-16 15:20:36 -070071};
72
73struct smu_device {
74 spinlock_t lock;
75 struct device_node *of_node;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070076 struct of_device *of_dev;
77 int doorbell; /* doorbell gpio */
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 u32 __iomem *db_buf; /* doorbell buffer */
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -070079 struct device_node *db_node;
80 unsigned int db_irq;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070081 int msg;
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -070082 struct device_node *msg_node;
83 unsigned int msg_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 struct smu_cmd_buf *cmd_buf; /* command buffer virtual */
85 u32 cmd_buf_abs; /* command buffer absolute */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070086 struct list_head cmd_list;
87 struct smu_cmd *cmd_cur; /* pending command */
88 struct list_head cmd_i2c_list;
89 struct smu_i2c_cmd *cmd_i2c_cur; /* pending i2c command */
90 struct timer_list i2c_timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091};
92
93/*
94 * I don't think there will ever be more than one SMU, so
95 * for now, just hard code that
96 */
97static struct smu_device *smu;
Ingo Molnar14cc3e22006-03-26 01:37:14 -080098static DEFINE_MUTEX(smu_part_access);
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -070099static int smu_irq_inited;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700100
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100101static void smu_i2c_retry(unsigned long data);
102
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103/*
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700104 * SMU driver low level stuff
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700107static void smu_start_cmd(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700109 unsigned long faddr, fend;
110 struct smu_cmd *cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700112 if (list_empty(&smu->cmd_list))
113 return;
114
115 /* Fetch first command in queue */
116 cmd = list_entry(smu->cmd_list.next, struct smu_cmd, link);
117 smu->cmd_cur = cmd;
118 list_del(&cmd->link);
119
120 DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd->cmd,
121 cmd->data_len);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100122 DPRINTK("SMU: data buffer: %02x %02x %02x %02x %02x %02x %02x %02x\n",
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700123 ((u8 *)cmd->data_buf)[0], ((u8 *)cmd->data_buf)[1],
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100124 ((u8 *)cmd->data_buf)[2], ((u8 *)cmd->data_buf)[3],
125 ((u8 *)cmd->data_buf)[4], ((u8 *)cmd->data_buf)[5],
126 ((u8 *)cmd->data_buf)[6], ((u8 *)cmd->data_buf)[7]);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700127
128 /* Fill the SMU command buffer */
129 smu->cmd_buf->cmd = cmd->cmd;
130 smu->cmd_buf->length = cmd->data_len;
131 memcpy(smu->cmd_buf->data, cmd->data_buf, cmd->data_len);
132
133 /* Flush command and data to RAM */
134 faddr = (unsigned long)smu->cmd_buf;
135 fend = faddr + smu->cmd_buf->length + 2;
136 flush_inval_dcache_range(faddr, fend);
137
138 /* This isn't exactly a DMA mapping here, I suspect
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 * the SMU is actually communicating with us via i2c to the
140 * northbridge or the CPU to access RAM.
141 */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700142 writel(smu->cmd_buf_abs, smu->db_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
144 /* Ring the SMU doorbell */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700145 pmac_do_feature_call(PMAC_FTR_WRITE_GPIO, NULL, smu->doorbell, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146}
147
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700148
David Howells7d12e782006-10-05 14:55:46 +0100149static irqreturn_t smu_db_intr(int irq, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700151 unsigned long flags;
152 struct smu_cmd *cmd;
153 void (*done)(struct smu_cmd *cmd, void *misc) = NULL;
154 void *misc = NULL;
155 u8 gpio;
156 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700158 /* SMU completed the command, well, we hope, let's make sure
159 * of it
160 */
161 spin_lock_irqsave(&smu->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700163 gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
Benjamin Herrenschmidta44fe132005-09-30 08:25:17 +1000164 if ((gpio & 7) != 7) {
165 spin_unlock_irqrestore(&smu->lock, flags);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700166 return IRQ_HANDLED;
Benjamin Herrenschmidta44fe132005-09-30 08:25:17 +1000167 }
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700168
169 cmd = smu->cmd_cur;
170 smu->cmd_cur = NULL;
171 if (cmd == NULL)
172 goto bail;
173
174 if (rc == 0) {
175 unsigned long faddr;
176 int reply_len;
177 u8 ack;
178
179 /* CPU might have brought back the cache line, so we need
180 * to flush again before peeking at the SMU response. We
181 * flush the entire buffer for now as we haven't read the
182 * reply lenght (it's only 2 cache lines anyway)
183 */
184 faddr = (unsigned long)smu->cmd_buf;
185 flush_inval_dcache_range(faddr, faddr + 256);
186
187 /* Now check ack */
188 ack = (~cmd->cmd) & 0xff;
189 if (ack != smu->cmd_buf->cmd) {
190 DPRINTK("SMU: incorrect ack, want %x got %x\n",
191 ack, smu->cmd_buf->cmd);
192 rc = -EIO;
193 }
194 reply_len = rc == 0 ? smu->cmd_buf->length : 0;
195 DPRINTK("SMU: reply len: %d\n", reply_len);
196 if (reply_len > cmd->reply_len) {
197 printk(KERN_WARNING "SMU: reply buffer too small,"
198 "got %d bytes for a %d bytes buffer\n",
199 reply_len, cmd->reply_len);
200 reply_len = cmd->reply_len;
201 }
202 cmd->reply_len = reply_len;
203 if (cmd->reply_buf && reply_len)
204 memcpy(cmd->reply_buf, smu->cmd_buf->data, reply_len);
205 }
206
207 /* Now complete the command. Write status last in order as we lost
208 * ownership of the command structure as soon as it's no longer -1
209 */
210 done = cmd->done;
211 misc = cmd->misc;
212 mb();
213 cmd->status = rc;
214 bail:
215 /* Start next command if any */
216 smu_start_cmd();
217 spin_unlock_irqrestore(&smu->lock, flags);
218
219 /* Call command completion handler if any */
220 if (done)
221 done(cmd, misc);
222
223 /* It's an edge interrupt, nothing to do */
224 return IRQ_HANDLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225}
226
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700227
David Howells7d12e782006-10-05 14:55:46 +0100228static irqreturn_t smu_msg_intr(int irq, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700230 /* I don't quite know what to do with this one, we seem to never
231 * receive it, so I suspect we have to arm it someway in the SMU
232 * to start getting events that way.
233 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700235 printk(KERN_INFO "SMU: message interrupt !\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700237 /* It's an edge interrupt, nothing to do */
238 return IRQ_HANDLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239}
240
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700241
242/*
243 * Queued command management.
244 *
245 */
246
247int smu_queue_cmd(struct smu_cmd *cmd)
248{
249 unsigned long flags;
250
251 if (smu == NULL)
252 return -ENODEV;
253 if (cmd->data_len > SMU_MAX_DATA ||
254 cmd->reply_len > SMU_MAX_DATA)
255 return -EINVAL;
256
257 cmd->status = 1;
258 spin_lock_irqsave(&smu->lock, flags);
259 list_add_tail(&cmd->link, &smu->cmd_list);
260 if (smu->cmd_cur == NULL)
261 smu_start_cmd();
262 spin_unlock_irqrestore(&smu->lock, flags);
263
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700264 /* Workaround for early calls when irq isn't available */
265 if (!smu_irq_inited || smu->db_irq == NO_IRQ)
266 smu_spinwait_cmd(cmd);
267
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700268 return 0;
269}
270EXPORT_SYMBOL(smu_queue_cmd);
271
272
273int smu_queue_simple(struct smu_simple_cmd *scmd, u8 command,
274 unsigned int data_len,
275 void (*done)(struct smu_cmd *cmd, void *misc),
276 void *misc, ...)
277{
278 struct smu_cmd *cmd = &scmd->cmd;
279 va_list list;
280 int i;
281
282 if (data_len > sizeof(scmd->buffer))
283 return -EINVAL;
284
285 memset(scmd, 0, sizeof(*scmd));
286 cmd->cmd = command;
287 cmd->data_len = data_len;
288 cmd->data_buf = scmd->buffer;
289 cmd->reply_len = sizeof(scmd->buffer);
290 cmd->reply_buf = scmd->buffer;
291 cmd->done = done;
292 cmd->misc = misc;
293
294 va_start(list, misc);
295 for (i = 0; i < data_len; ++i)
296 scmd->buffer[i] = (u8)va_arg(list, int);
297 va_end(list);
298
299 return smu_queue_cmd(cmd);
300}
301EXPORT_SYMBOL(smu_queue_simple);
302
303
304void smu_poll(void)
305{
306 u8 gpio;
307
308 if (smu == NULL)
309 return;
310
311 gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
312 if ((gpio & 7) == 7)
David Howells7d12e782006-10-05 14:55:46 +0100313 smu_db_intr(smu->db_irq, smu);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700314}
315EXPORT_SYMBOL(smu_poll);
316
317
318void smu_done_complete(struct smu_cmd *cmd, void *misc)
319{
320 struct completion *comp = misc;
321
322 complete(comp);
323}
324EXPORT_SYMBOL(smu_done_complete);
325
326
327void smu_spinwait_cmd(struct smu_cmd *cmd)
328{
329 while(cmd->status == 1)
330 smu_poll();
331}
332EXPORT_SYMBOL(smu_spinwait_cmd);
333
334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335/* RTC low level commands */
336static inline int bcd2hex (int n)
337{
338 return (((n & 0xf0) >> 4) * 10) + (n & 0xf);
339}
340
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700341
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342static inline int hex2bcd (int n)
343{
344 return ((n / 10) << 4) + (n % 10);
345}
346
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
348static inline void smu_fill_set_rtc_cmd(struct smu_cmd_buf *cmd_buf,
349 struct rtc_time *time)
350{
351 cmd_buf->cmd = 0x8e;
352 cmd_buf->length = 8;
353 cmd_buf->data[0] = 0x80;
354 cmd_buf->data[1] = hex2bcd(time->tm_sec);
355 cmd_buf->data[2] = hex2bcd(time->tm_min);
356 cmd_buf->data[3] = hex2bcd(time->tm_hour);
357 cmd_buf->data[4] = time->tm_wday;
358 cmd_buf->data[5] = hex2bcd(time->tm_mday);
359 cmd_buf->data[6] = hex2bcd(time->tm_mon) + 1;
360 cmd_buf->data[7] = hex2bcd(time->tm_year - 100);
361}
362
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700364int smu_get_rtc_time(struct rtc_time *time, int spinwait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700366 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 int rc;
368
369 if (smu == NULL)
370 return -ENODEV;
371
372 memset(time, 0, sizeof(struct rtc_time));
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700373 rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 1, NULL, NULL,
374 SMU_CMD_RTC_GET_DATETIME);
375 if (rc)
376 return rc;
377 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700379 time->tm_sec = bcd2hex(cmd.buffer[0]);
380 time->tm_min = bcd2hex(cmd.buffer[1]);
381 time->tm_hour = bcd2hex(cmd.buffer[2]);
382 time->tm_wday = bcd2hex(cmd.buffer[3]);
383 time->tm_mday = bcd2hex(cmd.buffer[4]);
384 time->tm_mon = bcd2hex(cmd.buffer[5]) - 1;
385 time->tm_year = bcd2hex(cmd.buffer[6]) + 100;
386
387 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388}
389
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700390
391int smu_set_rtc_time(struct rtc_time *time, int spinwait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700393 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 int rc;
395
396 if (smu == NULL)
397 return -ENODEV;
398
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700399 rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 8, NULL, NULL,
400 SMU_CMD_RTC_SET_DATETIME,
401 hex2bcd(time->tm_sec),
402 hex2bcd(time->tm_min),
403 hex2bcd(time->tm_hour),
404 time->tm_wday,
405 hex2bcd(time->tm_mday),
406 hex2bcd(time->tm_mon) + 1,
407 hex2bcd(time->tm_year - 100));
408 if (rc)
409 return rc;
410 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700412 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413}
414
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700415
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416void smu_shutdown(void)
417{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700418 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
420 if (smu == NULL)
421 return;
422
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700423 if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 9, NULL, NULL,
424 'S', 'H', 'U', 'T', 'D', 'O', 'W', 'N', 0))
425 return;
426 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 for (;;)
428 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429}
430
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700431
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432void smu_restart(void)
433{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700434 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436 if (smu == NULL)
437 return;
438
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700439 if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, NULL, NULL,
440 'R', 'E', 'S', 'T', 'A', 'R', 'T', 0))
441 return;
442 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 for (;;)
444 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445}
446
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700447
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448int smu_present(void)
449{
450 return smu != NULL;
451}
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700452EXPORT_SYMBOL(smu_present);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
454
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100455int __init smu_init (void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456{
457 struct device_node *np;
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000458 const u32 *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
460 np = of_find_node_by_type(NULL, "smu");
461 if (np == NULL)
462 return -ENODEV;
463
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700464 printk(KERN_INFO "SMU driver %s %s\n", VERSION, AUTHOR);
465
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 if (smu_cmdbuf_abs == 0) {
467 printk(KERN_ERR "SMU: Command buffer not allocated !\n");
468 return -EINVAL;
469 }
470
471 smu = alloc_bootmem(sizeof(struct smu_device));
472 if (smu == NULL)
473 return -ENOMEM;
474 memset(smu, 0, sizeof(*smu));
475
476 spin_lock_init(&smu->lock);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700477 INIT_LIST_HEAD(&smu->cmd_list);
478 INIT_LIST_HEAD(&smu->cmd_i2c_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 smu->of_node = np;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700480 smu->db_irq = NO_IRQ;
481 smu->msg_irq = NO_IRQ;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 /* smu_cmdbuf_abs is in the low 2G of RAM, can be converted to a
484 * 32 bits value safely
485 */
486 smu->cmd_buf_abs = (u32)smu_cmdbuf_abs;
487 smu->cmd_buf = (struct smu_cmd_buf *)abs_to_virt(smu_cmdbuf_abs);
488
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700489 smu->db_node = of_find_node_by_name(NULL, "smu-doorbell");
490 if (smu->db_node == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n");
492 goto fail;
493 }
Stephen Rothwell01b27262007-04-27 13:41:15 +1000494 data = of_get_property(smu->db_node, "reg", NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 if (data == NULL) {
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700496 of_node_put(smu->db_node);
497 smu->db_node = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n");
499 goto fail;
500 }
501
502 /* Current setup has one doorbell GPIO that does both doorbell
503 * and ack. GPIOs are at 0x50, best would be to find that out
504 * in the device-tree though.
505 */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700506 smu->doorbell = *data;
507 if (smu->doorbell < 0x50)
508 smu->doorbell += 0x50;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700509
510 /* Now look for the smu-interrupt GPIO */
511 do {
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700512 smu->msg_node = of_find_node_by_name(NULL, "smu-interrupt");
513 if (smu->msg_node == NULL)
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700514 break;
Stephen Rothwell01b27262007-04-27 13:41:15 +1000515 data = of_get_property(smu->msg_node, "reg", NULL);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700516 if (data == NULL) {
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700517 of_node_put(smu->msg_node);
518 smu->msg_node = NULL;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700519 break;
520 }
521 smu->msg = *data;
522 if (smu->msg < 0x50)
523 smu->msg += 0x50;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700524 } while(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
526 /* Doorbell buffer is currently hard-coded, I didn't find a proper
527 * device-tree entry giving the address. Best would probably to use
528 * an offset for K2 base though, but let's do it that way for now.
529 */
530 smu->db_buf = ioremap(0x8000860c, 0x1000);
531 if (smu->db_buf == NULL) {
532 printk(KERN_ERR "SMU: Can't map doorbell buffer pointer !\n");
533 goto fail;
534 }
535
536 sys_ctrler = SYS_CTRLER_SMU;
537 return 0;
538
539 fail:
540 smu = NULL;
541 return -ENXIO;
542
543}
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700544
545
546static int smu_late_init(void)
547{
548 if (!smu)
549 return 0;
550
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100551 init_timer(&smu->i2c_timer);
552 smu->i2c_timer.function = smu_i2c_retry;
553 smu->i2c_timer.data = (unsigned long)smu;
554
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700555 if (smu->db_node) {
556 smu->db_irq = irq_of_parse_and_map(smu->db_node, 0);
557 if (smu->db_irq == NO_IRQ)
558 printk(KERN_ERR "smu: failed to map irq for node %s\n",
559 smu->db_node->full_name);
560 }
561 if (smu->msg_node) {
562 smu->msg_irq = irq_of_parse_and_map(smu->msg_node, 0);
563 if (smu->msg_irq == NO_IRQ)
564 printk(KERN_ERR "smu: failed to map irq for node %s\n",
565 smu->msg_node->full_name);
566 }
567
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700568 /*
569 * Try to request the interrupts
570 */
571
572 if (smu->db_irq != NO_IRQ) {
573 if (request_irq(smu->db_irq, smu_db_intr,
Thomas Gleixnerdace1452006-07-01 19:29:38 -0700574 IRQF_SHARED, "SMU doorbell", smu) < 0) {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700575 printk(KERN_WARNING "SMU: can't "
576 "request interrupt %d\n",
577 smu->db_irq);
578 smu->db_irq = NO_IRQ;
579 }
580 }
581
582 if (smu->msg_irq != NO_IRQ) {
583 if (request_irq(smu->msg_irq, smu_msg_intr,
Thomas Gleixnerdace1452006-07-01 19:29:38 -0700584 IRQF_SHARED, "SMU message", smu) < 0) {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700585 printk(KERN_WARNING "SMU: can't "
586 "request interrupt %d\n",
587 smu->msg_irq);
588 smu->msg_irq = NO_IRQ;
589 }
590 }
591
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700592 smu_irq_inited = 1;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700593 return 0;
594}
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100595/* This has to be before arch_initcall as the low i2c stuff relies on the
596 * above having been done before we reach arch_initcalls
597 */
598core_initcall(smu_late_init);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700599
600/*
601 * sysfs visibility
602 */
603
David Howellsc4028952006-11-22 14:57:56 +0000604static void smu_expose_childs(struct work_struct *unused)
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700605{
Benjamin Herrenschmidta28d3af2006-01-07 11:35:26 +1100606 struct device_node *np;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700607
Benjamin Herrenschmidta28d3af2006-01-07 11:35:26 +1100608 for (np = NULL; (np = of_get_next_child(smu->of_node, np)) != NULL;)
Stephen Rothwell55b61fe2007-05-03 17:26:52 +1000609 if (of_device_is_compatible(np, "smu-sensors"))
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100610 of_platform_device_create(np, "smu-sensors",
611 &smu->of_dev->dev);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700612}
613
David Howellsc4028952006-11-22 14:57:56 +0000614static DECLARE_WORK(smu_expose_childs_work, smu_expose_childs);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700615
616static int smu_platform_probe(struct of_device* dev,
617 const struct of_device_id *match)
618{
619 if (!smu)
620 return -ENODEV;
621 smu->of_dev = dev;
622
623 /*
624 * Ok, we are matched, now expose all i2c busses. We have to defer
625 * that unfortunately or it would deadlock inside the device model
626 */
627 schedule_work(&smu_expose_childs_work);
628
629 return 0;
630}
631
632static struct of_device_id smu_platform_match[] =
633{
634 {
635 .type = "smu",
636 },
637 {},
638};
639
640static struct of_platform_driver smu_of_platform_driver =
641{
642 .name = "smu",
643 .match_table = smu_platform_match,
644 .probe = smu_platform_probe,
645};
646
647static int __init smu_init_sysfs(void)
648{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700649 /*
650 * Due to sysfs bogosity, a sysdev is not a real device, so
651 * we should in fact create both if we want sysdev semantics
652 * for power management.
653 * For now, we don't power manage machines with an SMU chip,
654 * I'm a bit too far from figuring out how that works with those
655 * new chipsets, but that will come back and bite us
656 */
Benjamin Herrenschmidt7eebde72006-11-11 17:24:59 +1100657 of_register_platform_driver(&smu_of_platform_driver);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700658 return 0;
659}
660
661device_initcall(smu_init_sysfs);
662
663struct of_device *smu_get_ofdev(void)
664{
665 if (!smu)
666 return NULL;
667 return smu->of_dev;
668}
669
670EXPORT_SYMBOL_GPL(smu_get_ofdev);
671
672/*
673 * i2c interface
674 */
675
676static void smu_i2c_complete_command(struct smu_i2c_cmd *cmd, int fail)
677{
678 void (*done)(struct smu_i2c_cmd *cmd, void *misc) = cmd->done;
679 void *misc = cmd->misc;
680 unsigned long flags;
681
682 /* Check for read case */
683 if (!fail && cmd->read) {
684 if (cmd->pdata[0] < 1)
685 fail = 1;
686 else
687 memcpy(cmd->info.data, &cmd->pdata[1],
688 cmd->info.datalen);
689 }
690
691 DPRINTK("SMU: completing, success: %d\n", !fail);
692
693 /* Update status and mark no pending i2c command with lock
694 * held so nobody comes in while we dequeue an eventual
695 * pending next i2c command
696 */
697 spin_lock_irqsave(&smu->lock, flags);
698 smu->cmd_i2c_cur = NULL;
699 wmb();
700 cmd->status = fail ? -EIO : 0;
701
702 /* Is there another i2c command waiting ? */
703 if (!list_empty(&smu->cmd_i2c_list)) {
704 struct smu_i2c_cmd *newcmd;
705
706 /* Fetch it, new current, remove from list */
707 newcmd = list_entry(smu->cmd_i2c_list.next,
708 struct smu_i2c_cmd, link);
709 smu->cmd_i2c_cur = newcmd;
710 list_del(&cmd->link);
711
712 /* Queue with low level smu */
713 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
714 if (smu->cmd_cur == NULL)
715 smu_start_cmd();
716 }
717 spin_unlock_irqrestore(&smu->lock, flags);
718
719 /* Call command completion handler if any */
720 if (done)
721 done(cmd, misc);
722
723}
724
725
726static void smu_i2c_retry(unsigned long data)
727{
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100728 struct smu_i2c_cmd *cmd = smu->cmd_i2c_cur;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700729
730 DPRINTK("SMU: i2c failure, requeuing...\n");
731
732 /* requeue command simply by resetting reply_len */
733 cmd->pdata[0] = 0xff;
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100734 cmd->scmd.reply_len = sizeof(cmd->pdata);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700735 smu_queue_cmd(&cmd->scmd);
736}
737
738
739static void smu_i2c_low_completion(struct smu_cmd *scmd, void *misc)
740{
741 struct smu_i2c_cmd *cmd = misc;
742 int fail = 0;
743
744 DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n",
745 cmd->stage, scmd->status, cmd->pdata[0], scmd->reply_len);
746
747 /* Check for possible status */
748 if (scmd->status < 0)
749 fail = 1;
750 else if (cmd->read) {
751 if (cmd->stage == 0)
752 fail = cmd->pdata[0] != 0;
753 else
754 fail = cmd->pdata[0] >= 0x80;
755 } else {
756 fail = cmd->pdata[0] != 0;
757 }
758
759 /* Handle failures by requeuing command, after 5ms interval
760 */
761 if (fail && --cmd->retries > 0) {
762 DPRINTK("SMU: i2c failure, starting timer...\n");
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100763 BUG_ON(cmd != smu->cmd_i2c_cur);
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700764 if (!smu_irq_inited) {
765 mdelay(5);
766 smu_i2c_retry(0);
767 return;
768 }
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100769 mod_timer(&smu->i2c_timer, jiffies + msecs_to_jiffies(5));
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700770 return;
771 }
772
773 /* If failure or stage 1, command is complete */
774 if (fail || cmd->stage != 0) {
775 smu_i2c_complete_command(cmd, fail);
776 return;
777 }
778
779 DPRINTK("SMU: going to stage 1\n");
780
781 /* Ok, initial command complete, now poll status */
782 scmd->reply_buf = cmd->pdata;
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100783 scmd->reply_len = sizeof(cmd->pdata);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700784 scmd->data_buf = cmd->pdata;
785 scmd->data_len = 1;
786 cmd->pdata[0] = 0;
787 cmd->stage = 1;
788 cmd->retries = 20;
789 smu_queue_cmd(scmd);
790}
791
792
793int smu_queue_i2c(struct smu_i2c_cmd *cmd)
794{
795 unsigned long flags;
796
797 if (smu == NULL)
798 return -ENODEV;
799
800 /* Fill most fields of scmd */
801 cmd->scmd.cmd = SMU_CMD_I2C_COMMAND;
802 cmd->scmd.done = smu_i2c_low_completion;
803 cmd->scmd.misc = cmd;
804 cmd->scmd.reply_buf = cmd->pdata;
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100805 cmd->scmd.reply_len = sizeof(cmd->pdata);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700806 cmd->scmd.data_buf = (u8 *)(char *)&cmd->info;
807 cmd->scmd.status = 1;
808 cmd->stage = 0;
809 cmd->pdata[0] = 0xff;
810 cmd->retries = 20;
811 cmd->status = 1;
812
813 /* Check transfer type, sanitize some "info" fields
814 * based on transfer type and do more checking
815 */
816 cmd->info.caddr = cmd->info.devaddr;
817 cmd->read = cmd->info.devaddr & 0x01;
818 switch(cmd->info.type) {
819 case SMU_I2C_TRANSFER_SIMPLE:
820 memset(&cmd->info.sublen, 0, 4);
821 break;
822 case SMU_I2C_TRANSFER_COMBINED:
823 cmd->info.devaddr &= 0xfe;
824 case SMU_I2C_TRANSFER_STDSUB:
825 if (cmd->info.sublen > 3)
826 return -EINVAL;
827 break;
828 default:
829 return -EINVAL;
830 }
831
832 /* Finish setting up command based on transfer direction
833 */
834 if (cmd->read) {
835 if (cmd->info.datalen > SMU_I2C_READ_MAX)
836 return -EINVAL;
837 memset(cmd->info.data, 0xff, cmd->info.datalen);
838 cmd->scmd.data_len = 9;
839 } else {
840 if (cmd->info.datalen > SMU_I2C_WRITE_MAX)
841 return -EINVAL;
842 cmd->scmd.data_len = 9 + cmd->info.datalen;
843 }
844
845 DPRINTK("SMU: i2c enqueuing command\n");
846 DPRINTK("SMU: %s, len=%d bus=%x addr=%x sub0=%x type=%x\n",
847 cmd->read ? "read" : "write", cmd->info.datalen,
848 cmd->info.bus, cmd->info.caddr,
849 cmd->info.subaddr[0], cmd->info.type);
850
851
852 /* Enqueue command in i2c list, and if empty, enqueue also in
853 * main command list
854 */
855 spin_lock_irqsave(&smu->lock, flags);
856 if (smu->cmd_i2c_cur == NULL) {
857 smu->cmd_i2c_cur = cmd;
858 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
859 if (smu->cmd_cur == NULL)
860 smu_start_cmd();
861 } else
862 list_add_tail(&cmd->link, &smu->cmd_i2c_list);
863 spin_unlock_irqrestore(&smu->lock, flags);
864
865 return 0;
866}
867
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100868/*
869 * Handling of "partitions"
870 */
871
872static int smu_read_datablock(u8 *dest, unsigned int addr, unsigned int len)
873{
Peter Zijlstra6e9a4732006-09-30 23:28:10 -0700874 DECLARE_COMPLETION_ONSTACK(comp);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100875 unsigned int chunk;
876 struct smu_cmd cmd;
877 int rc;
878 u8 params[8];
879
880 /* We currently use a chunk size of 0xe. We could check the
881 * SMU firmware version and use bigger sizes though
882 */
883 chunk = 0xe;
884
885 while (len) {
886 unsigned int clen = min(len, chunk);
887
888 cmd.cmd = SMU_CMD_MISC_ee_COMMAND;
889 cmd.data_len = 7;
890 cmd.data_buf = params;
891 cmd.reply_len = chunk;
892 cmd.reply_buf = dest;
893 cmd.done = smu_done_complete;
894 cmd.misc = &comp;
895 params[0] = SMU_CMD_MISC_ee_GET_DATABLOCK_REC;
896 params[1] = 0x4;
897 *((u32 *)&params[2]) = addr;
898 params[6] = clen;
899
900 rc = smu_queue_cmd(&cmd);
901 if (rc)
902 return rc;
903 wait_for_completion(&comp);
904 if (cmd.status != 0)
905 return rc;
906 if (cmd.reply_len != clen) {
907 printk(KERN_DEBUG "SMU: short read in "
908 "smu_read_datablock, got: %d, want: %d\n",
909 cmd.reply_len, clen);
910 return -EIO;
911 }
912 len -= clen;
913 addr += clen;
914 dest += clen;
915 }
916 return 0;
917}
918
919static struct smu_sdbp_header *smu_create_sdb_partition(int id)
920{
Peter Zijlstra6e9a4732006-09-30 23:28:10 -0700921 DECLARE_COMPLETION_ONSTACK(comp);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100922 struct smu_simple_cmd cmd;
923 unsigned int addr, len, tlen;
924 struct smu_sdbp_header *hdr;
925 struct property *prop;
926
927 /* First query the partition info */
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100928 DPRINTK("SMU: Query partition infos ... (irq=%d)\n", smu->db_irq);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100929 smu_queue_simple(&cmd, SMU_CMD_PARTITION_COMMAND, 2,
930 smu_done_complete, &comp,
931 SMU_CMD_PARTITION_LATEST, id);
932 wait_for_completion(&comp);
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100933 DPRINTK("SMU: done, status: %d, reply_len: %d\n",
934 cmd.cmd.status, cmd.cmd.reply_len);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100935
936 /* Partition doesn't exist (or other error) */
937 if (cmd.cmd.status != 0 || cmd.cmd.reply_len != 6)
938 return NULL;
939
940 /* Fetch address and length from reply */
941 addr = *((u16 *)cmd.buffer);
942 len = cmd.buffer[3] << 2;
943 /* Calucluate total length to allocate, including the 17 bytes
944 * for "sdb-partition-XX" that we append at the end of the buffer
945 */
946 tlen = sizeof(struct property) + len + 18;
947
Robert P. J. Daycd861282006-12-13 00:34:52 -0800948 prop = kzalloc(tlen, GFP_KERNEL);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100949 if (prop == NULL)
950 return NULL;
951 hdr = (struct smu_sdbp_header *)(prop + 1);
952 prop->name = ((char *)prop) + tlen - 18;
953 sprintf(prop->name, "sdb-partition-%02x", id);
954 prop->length = len;
Stephen Rothwell1a381472007-04-03 10:58:52 +1000955 prop->value = hdr;
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100956 prop->next = NULL;
957
958 /* Read the datablock */
959 if (smu_read_datablock((u8 *)hdr, addr, len)) {
960 printk(KERN_DEBUG "SMU: datablock read failed while reading "
961 "partition %02x !\n", id);
962 goto failure;
963 }
964
965 /* Got it, check a few things and create the property */
966 if (hdr->id != id) {
967 printk(KERN_DEBUG "SMU: Reading partition %02x and got "
968 "%02x !\n", id, hdr->id);
969 goto failure;
970 }
971 if (prom_add_property(smu->of_node, prop)) {
972 printk(KERN_DEBUG "SMU: Failed creating sdb-partition-%02x "
973 "property !\n", id);
974 goto failure;
975 }
976
977 return hdr;
978 failure:
979 kfree(prop);
980 return NULL;
981}
982
983/* Note: Only allowed to return error code in pointers (using ERR_PTR)
984 * when interruptible is 1
985 */
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000986const struct smu_sdbp_header *__smu_get_sdb_partition(int id,
987 unsigned int *size, int interruptible)
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100988{
989 char pname[32];
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000990 const struct smu_sdbp_header *part;
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100991
992 if (!smu)
993 return NULL;
994
995 sprintf(pname, "sdb-partition-%02x", id);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100996
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100997 DPRINTK("smu_get_sdb_partition(%02x)\n", id);
998
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100999 if (interruptible) {
1000 int rc;
Ingo Molnar14cc3e22006-03-26 01:37:14 -08001001 rc = mutex_lock_interruptible(&smu_part_access);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001002 if (rc)
1003 return ERR_PTR(rc);
1004 } else
Ingo Molnar14cc3e22006-03-26 01:37:14 -08001005 mutex_lock(&smu_part_access);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001006
Stephen Rothwell01b27262007-04-27 13:41:15 +10001007 part = of_get_property(smu->of_node, pname, size);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001008 if (part == NULL) {
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +11001009 DPRINTK("trying to extract from SMU ...\n");
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001010 part = smu_create_sdb_partition(id);
1011 if (part != NULL && size)
1012 *size = part->len << 2;
1013 }
Ingo Molnar14cc3e22006-03-26 01:37:14 -08001014 mutex_unlock(&smu_part_access);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001015 return part;
1016}
1017
Jeremy Kerr018a3d12006-07-12 15:40:29 +10001018const struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size)
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001019{
1020 return __smu_get_sdb_partition(id, size, 0);
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +11001021}
1022EXPORT_SYMBOL(smu_get_sdb_partition);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001023
1024
1025/*
1026 * Userland driver interface
1027 */
1028
1029
1030static LIST_HEAD(smu_clist);
1031static DEFINE_SPINLOCK(smu_clist_lock);
1032
1033enum smu_file_mode {
1034 smu_file_commands,
1035 smu_file_events,
1036 smu_file_closing
1037};
1038
1039struct smu_private
1040{
1041 struct list_head list;
1042 enum smu_file_mode mode;
1043 int busy;
1044 struct smu_cmd cmd;
1045 spinlock_t lock;
1046 wait_queue_head_t wait;
1047 u8 buffer[SMU_MAX_DATA];
1048};
1049
1050
1051static int smu_open(struct inode *inode, struct file *file)
1052{
1053 struct smu_private *pp;
1054 unsigned long flags;
1055
1056 pp = kmalloc(sizeof(struct smu_private), GFP_KERNEL);
1057 if (pp == 0)
1058 return -ENOMEM;
1059 memset(pp, 0, sizeof(struct smu_private));
1060 spin_lock_init(&pp->lock);
1061 pp->mode = smu_file_commands;
1062 init_waitqueue_head(&pp->wait);
1063
1064 spin_lock_irqsave(&smu_clist_lock, flags);
1065 list_add(&pp->list, &smu_clist);
1066 spin_unlock_irqrestore(&smu_clist_lock, flags);
1067 file->private_data = pp;
1068
1069 return 0;
1070}
1071
1072
1073static void smu_user_cmd_done(struct smu_cmd *cmd, void *misc)
1074{
1075 struct smu_private *pp = misc;
1076
1077 wake_up_all(&pp->wait);
1078}
1079
1080
1081static ssize_t smu_write(struct file *file, const char __user *buf,
1082 size_t count, loff_t *ppos)
1083{
1084 struct smu_private *pp = file->private_data;
1085 unsigned long flags;
1086 struct smu_user_cmd_hdr hdr;
1087 int rc = 0;
1088
1089 if (pp->busy)
1090 return -EBUSY;
1091 else if (copy_from_user(&hdr, buf, sizeof(hdr)))
1092 return -EFAULT;
1093 else if (hdr.cmdtype == SMU_CMDTYPE_WANTS_EVENTS) {
1094 pp->mode = smu_file_events;
1095 return 0;
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001096 } else if (hdr.cmdtype == SMU_CMDTYPE_GET_PARTITION) {
Jeremy Kerr018a3d12006-07-12 15:40:29 +10001097 const struct smu_sdbp_header *part;
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001098 part = __smu_get_sdb_partition(hdr.cmd, NULL, 1);
1099 if (part == NULL)
1100 return -EINVAL;
1101 else if (IS_ERR(part))
1102 return PTR_ERR(part);
1103 return 0;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001104 } else if (hdr.cmdtype != SMU_CMDTYPE_SMU)
1105 return -EINVAL;
1106 else if (pp->mode != smu_file_commands)
1107 return -EBADFD;
1108 else if (hdr.data_len > SMU_MAX_DATA)
1109 return -EINVAL;
1110
1111 spin_lock_irqsave(&pp->lock, flags);
1112 if (pp->busy) {
1113 spin_unlock_irqrestore(&pp->lock, flags);
1114 return -EBUSY;
1115 }
1116 pp->busy = 1;
1117 pp->cmd.status = 1;
1118 spin_unlock_irqrestore(&pp->lock, flags);
1119
1120 if (copy_from_user(pp->buffer, buf + sizeof(hdr), hdr.data_len)) {
1121 pp->busy = 0;
1122 return -EFAULT;
1123 }
1124
1125 pp->cmd.cmd = hdr.cmd;
1126 pp->cmd.data_len = hdr.data_len;
1127 pp->cmd.reply_len = SMU_MAX_DATA;
1128 pp->cmd.data_buf = pp->buffer;
1129 pp->cmd.reply_buf = pp->buffer;
1130 pp->cmd.done = smu_user_cmd_done;
1131 pp->cmd.misc = pp;
1132 rc = smu_queue_cmd(&pp->cmd);
1133 if (rc < 0)
1134 return rc;
1135 return count;
1136}
1137
1138
1139static ssize_t smu_read_command(struct file *file, struct smu_private *pp,
1140 char __user *buf, size_t count)
1141{
1142 DECLARE_WAITQUEUE(wait, current);
1143 struct smu_user_reply_hdr hdr;
1144 unsigned long flags;
1145 int size, rc = 0;
1146
1147 if (!pp->busy)
1148 return 0;
1149 if (count < sizeof(struct smu_user_reply_hdr))
1150 return -EOVERFLOW;
1151 spin_lock_irqsave(&pp->lock, flags);
1152 if (pp->cmd.status == 1) {
1153 if (file->f_flags & O_NONBLOCK)
1154 return -EAGAIN;
1155 add_wait_queue(&pp->wait, &wait);
1156 for (;;) {
1157 set_current_state(TASK_INTERRUPTIBLE);
1158 rc = 0;
1159 if (pp->cmd.status != 1)
1160 break;
1161 rc = -ERESTARTSYS;
1162 if (signal_pending(current))
1163 break;
1164 spin_unlock_irqrestore(&pp->lock, flags);
1165 schedule();
1166 spin_lock_irqsave(&pp->lock, flags);
1167 }
1168 set_current_state(TASK_RUNNING);
1169 remove_wait_queue(&pp->wait, &wait);
1170 }
1171 spin_unlock_irqrestore(&pp->lock, flags);
1172 if (rc)
1173 return rc;
1174 if (pp->cmd.status != 0)
1175 pp->cmd.reply_len = 0;
1176 size = sizeof(hdr) + pp->cmd.reply_len;
1177 if (count < size)
1178 size = count;
1179 rc = size;
1180 hdr.status = pp->cmd.status;
1181 hdr.reply_len = pp->cmd.reply_len;
1182 if (copy_to_user(buf, &hdr, sizeof(hdr)))
1183 return -EFAULT;
1184 size -= sizeof(hdr);
1185 if (size && copy_to_user(buf + sizeof(hdr), pp->buffer, size))
1186 return -EFAULT;
1187 pp->busy = 0;
1188
1189 return rc;
1190}
1191
1192
1193static ssize_t smu_read_events(struct file *file, struct smu_private *pp,
1194 char __user *buf, size_t count)
1195{
1196 /* Not implemented */
1197 msleep_interruptible(1000);
1198 return 0;
1199}
1200
1201
1202static ssize_t smu_read(struct file *file, char __user *buf,
1203 size_t count, loff_t *ppos)
1204{
1205 struct smu_private *pp = file->private_data;
1206
1207 if (pp->mode == smu_file_commands)
1208 return smu_read_command(file, pp, buf, count);
1209 if (pp->mode == smu_file_events)
1210 return smu_read_events(file, pp, buf, count);
1211
1212 return -EBADFD;
1213}
1214
1215static unsigned int smu_fpoll(struct file *file, poll_table *wait)
1216{
1217 struct smu_private *pp = file->private_data;
1218 unsigned int mask = 0;
1219 unsigned long flags;
1220
1221 if (pp == 0)
1222 return 0;
1223
1224 if (pp->mode == smu_file_commands) {
1225 poll_wait(file, &pp->wait, wait);
1226
1227 spin_lock_irqsave(&pp->lock, flags);
1228 if (pp->busy && pp->cmd.status != 1)
1229 mask |= POLLIN;
1230 spin_unlock_irqrestore(&pp->lock, flags);
1231 } if (pp->mode == smu_file_events) {
1232 /* Not yet implemented */
1233 }
1234 return mask;
1235}
1236
1237static int smu_release(struct inode *inode, struct file *file)
1238{
1239 struct smu_private *pp = file->private_data;
1240 unsigned long flags;
1241 unsigned int busy;
1242
1243 if (pp == 0)
1244 return 0;
1245
1246 file->private_data = NULL;
1247
1248 /* Mark file as closing to avoid races with new request */
1249 spin_lock_irqsave(&pp->lock, flags);
1250 pp->mode = smu_file_closing;
1251 busy = pp->busy;
1252
1253 /* Wait for any pending request to complete */
1254 if (busy && pp->cmd.status == 1) {
1255 DECLARE_WAITQUEUE(wait, current);
1256
1257 add_wait_queue(&pp->wait, &wait);
1258 for (;;) {
1259 set_current_state(TASK_UNINTERRUPTIBLE);
1260 if (pp->cmd.status != 1)
1261 break;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001262 spin_unlock_irqrestore(&pp->lock, flags);
Andrew Morton94256dd2007-04-16 22:53:25 -07001263 schedule();
1264 spin_lock_irqsave(&pp->lock, flags);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001265 }
1266 set_current_state(TASK_RUNNING);
1267 remove_wait_queue(&pp->wait, &wait);
1268 }
1269 spin_unlock_irqrestore(&pp->lock, flags);
1270
1271 spin_lock_irqsave(&smu_clist_lock, flags);
1272 list_del(&pp->list);
1273 spin_unlock_irqrestore(&smu_clist_lock, flags);
1274 kfree(pp);
1275
1276 return 0;
1277}
1278
1279
Arjan van de Venfa027c22007-02-12 00:55:33 -08001280static const struct file_operations smu_device_fops = {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001281 .llseek = no_llseek,
1282 .read = smu_read,
1283 .write = smu_write,
1284 .poll = smu_fpoll,
1285 .open = smu_open,
1286 .release = smu_release,
1287};
1288
Stephen Rothwell6b67f62c2005-09-27 14:09:39 +10001289static struct miscdevice pmu_device = {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001290 MISC_DYNAMIC_MINOR, "smu", &smu_device_fops
1291};
1292
1293static int smu_device_init(void)
1294{
1295 if (!smu)
1296 return -ENODEV;
1297 if (misc_register(&pmu_device) < 0)
1298 printk(KERN_ERR "via-pmu: cannot register misc device.\n");
1299 return 0;
1300}
1301device_initcall(smu_device_init);