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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
Joe Perchesf18816b2008-02-03 17:18:02 +020015 * interrupts off)
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070016 * - 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
Arnd Bergmannb9bde772008-05-20 19:16:11 +020022#include <linux/smp_lock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#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>
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070033#include <linux/completion.h>
34#include <linux/miscdevice.h>
35#include <linux/delay.h>
36#include <linux/sysdev.h>
37#include <linux/poll.h>
Ingo Molnar14cc3e22006-03-26 01:37:14 -080038#include <linux/mutex.h>
Stephen Rothwellad9e05a2008-05-23 16:27:02 +100039#include <linux/of_device.h>
40#include <linux/of_platform.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42#include <asm/byteorder.h>
43#include <asm/io.h>
44#include <asm/prom.h>
45#include <asm/machdep.h>
46#include <asm/pmac_feature.h>
47#include <asm/smu.h>
48#include <asm/sections.h>
49#include <asm/abs_addr.h>
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070050#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +110052#define VERSION "0.7"
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070053#define AUTHOR "(c) 2005 Benjamin Herrenschmidt, IBM Corp."
54
55#undef DEBUG_SMU
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57#ifdef DEBUG_SMU
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +110058#define DPRINTK(fmt, args...) do { printk(KERN_DEBUG fmt , ##args); } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#else
60#define DPRINTK(fmt, args...) do { } while (0)
61#endif
62
63/*
64 * This is the command buffer passed to the SMU hardware
65 */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070066#define SMU_MAX_DATA 254
67
Linus Torvalds1da177e2005-04-16 15:20:36 -070068struct smu_cmd_buf {
69 u8 cmd;
70 u8 length;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070071 u8 data[SMU_MAX_DATA];
Linus Torvalds1da177e2005-04-16 15:20:36 -070072};
73
74struct smu_device {
75 spinlock_t lock;
76 struct device_node *of_node;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070077 struct of_device *of_dev;
78 int doorbell; /* doorbell gpio */
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 u32 __iomem *db_buf; /* doorbell buffer */
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -070080 struct device_node *db_node;
81 unsigned int db_irq;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070082 int msg;
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -070083 struct device_node *msg_node;
84 unsigned int msg_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 struct smu_cmd_buf *cmd_buf; /* command buffer virtual */
86 u32 cmd_buf_abs; /* command buffer absolute */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070087 struct list_head cmd_list;
88 struct smu_cmd *cmd_cur; /* pending command */
Benjamin Herrenschmidt592a6072008-02-07 14:29:43 +110089 int broken_nap;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070090 struct list_head cmd_i2c_list;
91 struct smu_i2c_cmd *cmd_i2c_cur; /* pending i2c command */
92 struct timer_list i2c_timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093};
94
95/*
96 * I don't think there will ever be more than one SMU, so
97 * for now, just hard code that
98 */
99static struct smu_device *smu;
Ingo Molnar14cc3e22006-03-26 01:37:14 -0800100static DEFINE_MUTEX(smu_part_access);
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700101static int smu_irq_inited;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700102
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100103static void smu_i2c_retry(unsigned long data);
104
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105/*
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700106 * SMU driver low level stuff
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700109static void smu_start_cmd(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700111 unsigned long faddr, fend;
112 struct smu_cmd *cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700114 if (list_empty(&smu->cmd_list))
115 return;
116
117 /* Fetch first command in queue */
118 cmd = list_entry(smu->cmd_list.next, struct smu_cmd, link);
119 smu->cmd_cur = cmd;
120 list_del(&cmd->link);
121
122 DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd->cmd,
123 cmd->data_len);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100124 DPRINTK("SMU: data buffer: %02x %02x %02x %02x %02x %02x %02x %02x\n",
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700125 ((u8 *)cmd->data_buf)[0], ((u8 *)cmd->data_buf)[1],
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100126 ((u8 *)cmd->data_buf)[2], ((u8 *)cmd->data_buf)[3],
127 ((u8 *)cmd->data_buf)[4], ((u8 *)cmd->data_buf)[5],
128 ((u8 *)cmd->data_buf)[6], ((u8 *)cmd->data_buf)[7]);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700129
130 /* Fill the SMU command buffer */
131 smu->cmd_buf->cmd = cmd->cmd;
132 smu->cmd_buf->length = cmd->data_len;
133 memcpy(smu->cmd_buf->data, cmd->data_buf, cmd->data_len);
134
135 /* Flush command and data to RAM */
136 faddr = (unsigned long)smu->cmd_buf;
137 fend = faddr + smu->cmd_buf->length + 2;
138 flush_inval_dcache_range(faddr, fend);
139
Benjamin Herrenschmidt592a6072008-02-07 14:29:43 +1100140
141 /* We also disable NAP mode for the duration of the command
142 * on U3 based machines.
143 * This is slightly racy as it can be written back to 1 by a sysctl
144 * but that never happens in practice. There seem to be an issue with
145 * U3 based machines such as the iMac G5 where napping for the
146 * whole duration of the command prevents the SMU from fetching it
147 * from memory. This might be related to the strange i2c based
148 * mechanism the SMU uses to access memory.
149 */
150 if (smu->broken_nap)
151 powersave_nap = 0;
152
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700153 /* This isn't exactly a DMA mapping here, I suspect
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 * the SMU is actually communicating with us via i2c to the
155 * northbridge or the CPU to access RAM.
156 */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700157 writel(smu->cmd_buf_abs, smu->db_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159 /* Ring the SMU doorbell */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700160 pmac_do_feature_call(PMAC_FTR_WRITE_GPIO, NULL, smu->doorbell, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161}
162
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700163
David Howells7d12e782006-10-05 14:55:46 +0100164static irqreturn_t smu_db_intr(int irq, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700166 unsigned long flags;
167 struct smu_cmd *cmd;
168 void (*done)(struct smu_cmd *cmd, void *misc) = NULL;
169 void *misc = NULL;
170 u8 gpio;
171 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700173 /* SMU completed the command, well, we hope, let's make sure
174 * of it
175 */
176 spin_lock_irqsave(&smu->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700178 gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
Benjamin Herrenschmidta44fe132005-09-30 08:25:17 +1000179 if ((gpio & 7) != 7) {
180 spin_unlock_irqrestore(&smu->lock, flags);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700181 return IRQ_HANDLED;
Benjamin Herrenschmidta44fe132005-09-30 08:25:17 +1000182 }
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700183
184 cmd = smu->cmd_cur;
185 smu->cmd_cur = NULL;
186 if (cmd == NULL)
187 goto bail;
188
189 if (rc == 0) {
190 unsigned long faddr;
191 int reply_len;
192 u8 ack;
193
194 /* CPU might have brought back the cache line, so we need
195 * to flush again before peeking at the SMU response. We
196 * flush the entire buffer for now as we haven't read the
Paulius Zaleckasefad798b2008-02-03 15:42:53 +0200197 * reply length (it's only 2 cache lines anyway)
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700198 */
199 faddr = (unsigned long)smu->cmd_buf;
200 flush_inval_dcache_range(faddr, faddr + 256);
201
202 /* Now check ack */
203 ack = (~cmd->cmd) & 0xff;
204 if (ack != smu->cmd_buf->cmd) {
205 DPRINTK("SMU: incorrect ack, want %x got %x\n",
206 ack, smu->cmd_buf->cmd);
207 rc = -EIO;
208 }
209 reply_len = rc == 0 ? smu->cmd_buf->length : 0;
210 DPRINTK("SMU: reply len: %d\n", reply_len);
211 if (reply_len > cmd->reply_len) {
212 printk(KERN_WARNING "SMU: reply buffer too small,"
213 "got %d bytes for a %d bytes buffer\n",
214 reply_len, cmd->reply_len);
215 reply_len = cmd->reply_len;
216 }
217 cmd->reply_len = reply_len;
218 if (cmd->reply_buf && reply_len)
219 memcpy(cmd->reply_buf, smu->cmd_buf->data, reply_len);
220 }
221
222 /* Now complete the command. Write status last in order as we lost
223 * ownership of the command structure as soon as it's no longer -1
224 */
225 done = cmd->done;
226 misc = cmd->misc;
227 mb();
228 cmd->status = rc;
Benjamin Herrenschmidt592a6072008-02-07 14:29:43 +1100229
230 /* Re-enable NAP mode */
231 if (smu->broken_nap)
232 powersave_nap = 1;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700233 bail:
234 /* Start next command if any */
235 smu_start_cmd();
236 spin_unlock_irqrestore(&smu->lock, flags);
237
238 /* Call command completion handler if any */
239 if (done)
240 done(cmd, misc);
241
242 /* It's an edge interrupt, nothing to do */
243 return IRQ_HANDLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244}
245
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700246
David Howells7d12e782006-10-05 14:55:46 +0100247static irqreturn_t smu_msg_intr(int irq, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700249 /* I don't quite know what to do with this one, we seem to never
250 * receive it, so I suspect we have to arm it someway in the SMU
251 * to start getting events that way.
252 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700254 printk(KERN_INFO "SMU: message interrupt !\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700256 /* It's an edge interrupt, nothing to do */
257 return IRQ_HANDLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258}
259
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700260
261/*
262 * Queued command management.
263 *
264 */
265
266int smu_queue_cmd(struct smu_cmd *cmd)
267{
268 unsigned long flags;
269
270 if (smu == NULL)
271 return -ENODEV;
272 if (cmd->data_len > SMU_MAX_DATA ||
273 cmd->reply_len > SMU_MAX_DATA)
274 return -EINVAL;
275
276 cmd->status = 1;
277 spin_lock_irqsave(&smu->lock, flags);
278 list_add_tail(&cmd->link, &smu->cmd_list);
279 if (smu->cmd_cur == NULL)
280 smu_start_cmd();
281 spin_unlock_irqrestore(&smu->lock, flags);
282
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700283 /* Workaround for early calls when irq isn't available */
284 if (!smu_irq_inited || smu->db_irq == NO_IRQ)
285 smu_spinwait_cmd(cmd);
286
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700287 return 0;
288}
289EXPORT_SYMBOL(smu_queue_cmd);
290
291
292int smu_queue_simple(struct smu_simple_cmd *scmd, u8 command,
293 unsigned int data_len,
294 void (*done)(struct smu_cmd *cmd, void *misc),
295 void *misc, ...)
296{
297 struct smu_cmd *cmd = &scmd->cmd;
298 va_list list;
299 int i;
300
301 if (data_len > sizeof(scmd->buffer))
302 return -EINVAL;
303
304 memset(scmd, 0, sizeof(*scmd));
305 cmd->cmd = command;
306 cmd->data_len = data_len;
307 cmd->data_buf = scmd->buffer;
308 cmd->reply_len = sizeof(scmd->buffer);
309 cmd->reply_buf = scmd->buffer;
310 cmd->done = done;
311 cmd->misc = misc;
312
313 va_start(list, misc);
314 for (i = 0; i < data_len; ++i)
315 scmd->buffer[i] = (u8)va_arg(list, int);
316 va_end(list);
317
318 return smu_queue_cmd(cmd);
319}
320EXPORT_SYMBOL(smu_queue_simple);
321
322
323void smu_poll(void)
324{
325 u8 gpio;
326
327 if (smu == NULL)
328 return;
329
330 gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
331 if ((gpio & 7) == 7)
David Howells7d12e782006-10-05 14:55:46 +0100332 smu_db_intr(smu->db_irq, smu);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700333}
334EXPORT_SYMBOL(smu_poll);
335
336
337void smu_done_complete(struct smu_cmd *cmd, void *misc)
338{
339 struct completion *comp = misc;
340
341 complete(comp);
342}
343EXPORT_SYMBOL(smu_done_complete);
344
345
346void smu_spinwait_cmd(struct smu_cmd *cmd)
347{
348 while(cmd->status == 1)
349 smu_poll();
350}
351EXPORT_SYMBOL(smu_spinwait_cmd);
352
353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354/* RTC low level commands */
355static inline int bcd2hex (int n)
356{
357 return (((n & 0xf0) >> 4) * 10) + (n & 0xf);
358}
359
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700360
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361static inline int hex2bcd (int n)
362{
363 return ((n / 10) << 4) + (n % 10);
364}
365
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
367static inline void smu_fill_set_rtc_cmd(struct smu_cmd_buf *cmd_buf,
368 struct rtc_time *time)
369{
370 cmd_buf->cmd = 0x8e;
371 cmd_buf->length = 8;
372 cmd_buf->data[0] = 0x80;
373 cmd_buf->data[1] = hex2bcd(time->tm_sec);
374 cmd_buf->data[2] = hex2bcd(time->tm_min);
375 cmd_buf->data[3] = hex2bcd(time->tm_hour);
376 cmd_buf->data[4] = time->tm_wday;
377 cmd_buf->data[5] = hex2bcd(time->tm_mday);
378 cmd_buf->data[6] = hex2bcd(time->tm_mon) + 1;
379 cmd_buf->data[7] = hex2bcd(time->tm_year - 100);
380}
381
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700383int smu_get_rtc_time(struct rtc_time *time, int spinwait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700385 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 int rc;
387
388 if (smu == NULL)
389 return -ENODEV;
390
391 memset(time, 0, sizeof(struct rtc_time));
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700392 rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 1, NULL, NULL,
393 SMU_CMD_RTC_GET_DATETIME);
394 if (rc)
395 return rc;
396 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700398 time->tm_sec = bcd2hex(cmd.buffer[0]);
399 time->tm_min = bcd2hex(cmd.buffer[1]);
400 time->tm_hour = bcd2hex(cmd.buffer[2]);
401 time->tm_wday = bcd2hex(cmd.buffer[3]);
402 time->tm_mday = bcd2hex(cmd.buffer[4]);
403 time->tm_mon = bcd2hex(cmd.buffer[5]) - 1;
404 time->tm_year = bcd2hex(cmd.buffer[6]) + 100;
405
406 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407}
408
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700409
410int smu_set_rtc_time(struct rtc_time *time, int spinwait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700412 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 int rc;
414
415 if (smu == NULL)
416 return -ENODEV;
417
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700418 rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 8, NULL, NULL,
419 SMU_CMD_RTC_SET_DATETIME,
420 hex2bcd(time->tm_sec),
421 hex2bcd(time->tm_min),
422 hex2bcd(time->tm_hour),
423 time->tm_wday,
424 hex2bcd(time->tm_mday),
425 hex2bcd(time->tm_mon) + 1,
426 hex2bcd(time->tm_year - 100));
427 if (rc)
428 return rc;
429 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700431 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432}
433
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435void smu_shutdown(void)
436{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700437 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
439 if (smu == NULL)
440 return;
441
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700442 if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 9, NULL, NULL,
443 'S', 'H', 'U', 'T', 'D', 'O', 'W', 'N', 0))
444 return;
445 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 for (;;)
447 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448}
449
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451void smu_restart(void)
452{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700453 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
455 if (smu == NULL)
456 return;
457
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700458 if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, NULL, NULL,
459 'R', 'E', 'S', 'T', 'A', 'R', 'T', 0))
460 return;
461 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 for (;;)
463 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464}
465
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700466
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467int smu_present(void)
468{
469 return smu != NULL;
470}
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700471EXPORT_SYMBOL(smu_present);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
473
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100474int __init smu_init (void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475{
476 struct device_node *np;
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000477 const u32 *data;
Julia Lawall73f38fe2008-06-24 04:14:52 +1000478 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
480 np = of_find_node_by_type(NULL, "smu");
481 if (np == NULL)
482 return -ENODEV;
483
Benjamin Herrenschmidt592a6072008-02-07 14:29:43 +1100484 printk(KERN_INFO "SMU: Driver %s %s\n", VERSION, AUTHOR);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700485
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 if (smu_cmdbuf_abs == 0) {
487 printk(KERN_ERR "SMU: Command buffer not allocated !\n");
Julia Lawall73f38fe2008-06-24 04:14:52 +1000488 ret = -EINVAL;
489 goto fail_np;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 }
491
492 smu = alloc_bootmem(sizeof(struct smu_device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494 spin_lock_init(&smu->lock);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700495 INIT_LIST_HEAD(&smu->cmd_list);
496 INIT_LIST_HEAD(&smu->cmd_i2c_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 smu->of_node = np;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700498 smu->db_irq = NO_IRQ;
499 smu->msg_irq = NO_IRQ;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700500
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 /* smu_cmdbuf_abs is in the low 2G of RAM, can be converted to a
502 * 32 bits value safely
503 */
504 smu->cmd_buf_abs = (u32)smu_cmdbuf_abs;
505 smu->cmd_buf = (struct smu_cmd_buf *)abs_to_virt(smu_cmdbuf_abs);
506
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700507 smu->db_node = of_find_node_by_name(NULL, "smu-doorbell");
508 if (smu->db_node == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n");
Julia Lawall73f38fe2008-06-24 04:14:52 +1000510 ret = -ENXIO;
511 goto fail_bootmem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 }
Stephen Rothwell01b27262007-04-27 13:41:15 +1000513 data = of_get_property(smu->db_node, "reg", NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 if (data == NULL) {
515 printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n");
Julia Lawall73f38fe2008-06-24 04:14:52 +1000516 ret = -ENXIO;
517 goto fail_db_node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 }
519
520 /* Current setup has one doorbell GPIO that does both doorbell
521 * and ack. GPIOs are at 0x50, best would be to find that out
522 * in the device-tree though.
523 */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700524 smu->doorbell = *data;
525 if (smu->doorbell < 0x50)
526 smu->doorbell += 0x50;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700527
528 /* Now look for the smu-interrupt GPIO */
529 do {
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700530 smu->msg_node = of_find_node_by_name(NULL, "smu-interrupt");
531 if (smu->msg_node == NULL)
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700532 break;
Stephen Rothwell01b27262007-04-27 13:41:15 +1000533 data = of_get_property(smu->msg_node, "reg", NULL);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700534 if (data == NULL) {
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700535 of_node_put(smu->msg_node);
536 smu->msg_node = NULL;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700537 break;
538 }
539 smu->msg = *data;
540 if (smu->msg < 0x50)
541 smu->msg += 0x50;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700542 } while(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
544 /* Doorbell buffer is currently hard-coded, I didn't find a proper
545 * device-tree entry giving the address. Best would probably to use
546 * an offset for K2 base though, but let's do it that way for now.
547 */
548 smu->db_buf = ioremap(0x8000860c, 0x1000);
549 if (smu->db_buf == NULL) {
550 printk(KERN_ERR "SMU: Can't map doorbell buffer pointer !\n");
Julia Lawall73f38fe2008-06-24 04:14:52 +1000551 ret = -ENXIO;
552 goto fail_msg_node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 }
554
Benjamin Herrenschmidt592a6072008-02-07 14:29:43 +1100555 /* U3 has an issue with NAP mode when issuing SMU commands */
556 smu->broken_nap = pmac_get_uninorth_variant() < 4;
557 if (smu->broken_nap)
558 printk(KERN_INFO "SMU: using NAP mode workaround\n");
559
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 sys_ctrler = SYS_CTRLER_SMU;
561 return 0;
562
Julia Lawall73f38fe2008-06-24 04:14:52 +1000563fail_msg_node:
564 if (smu->msg_node)
565 of_node_put(smu->msg_node);
566fail_db_node:
567 of_node_put(smu->db_node);
568fail_bootmem:
569 free_bootmem((unsigned long)smu, sizeof(struct smu_device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 smu = NULL;
Julia Lawall73f38fe2008-06-24 04:14:52 +1000571fail_np:
572 of_node_put(np);
573 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574}
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700575
576
577static int smu_late_init(void)
578{
579 if (!smu)
580 return 0;
581
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100582 init_timer(&smu->i2c_timer);
583 smu->i2c_timer.function = smu_i2c_retry;
584 smu->i2c_timer.data = (unsigned long)smu;
585
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700586 if (smu->db_node) {
587 smu->db_irq = irq_of_parse_and_map(smu->db_node, 0);
588 if (smu->db_irq == NO_IRQ)
589 printk(KERN_ERR "smu: failed to map irq for node %s\n",
590 smu->db_node->full_name);
591 }
592 if (smu->msg_node) {
593 smu->msg_irq = irq_of_parse_and_map(smu->msg_node, 0);
594 if (smu->msg_irq == NO_IRQ)
595 printk(KERN_ERR "smu: failed to map irq for node %s\n",
596 smu->msg_node->full_name);
597 }
598
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700599 /*
600 * Try to request the interrupts
601 */
602
603 if (smu->db_irq != NO_IRQ) {
604 if (request_irq(smu->db_irq, smu_db_intr,
Thomas Gleixnerdace1452006-07-01 19:29:38 -0700605 IRQF_SHARED, "SMU doorbell", smu) < 0) {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700606 printk(KERN_WARNING "SMU: can't "
607 "request interrupt %d\n",
608 smu->db_irq);
609 smu->db_irq = NO_IRQ;
610 }
611 }
612
613 if (smu->msg_irq != NO_IRQ) {
614 if (request_irq(smu->msg_irq, smu_msg_intr,
Thomas Gleixnerdace1452006-07-01 19:29:38 -0700615 IRQF_SHARED, "SMU message", smu) < 0) {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700616 printk(KERN_WARNING "SMU: can't "
617 "request interrupt %d\n",
618 smu->msg_irq);
619 smu->msg_irq = NO_IRQ;
620 }
621 }
622
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700623 smu_irq_inited = 1;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700624 return 0;
625}
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100626/* This has to be before arch_initcall as the low i2c stuff relies on the
627 * above having been done before we reach arch_initcalls
628 */
629core_initcall(smu_late_init);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700630
631/*
632 * sysfs visibility
633 */
634
David Howellsc4028952006-11-22 14:57:56 +0000635static void smu_expose_childs(struct work_struct *unused)
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700636{
Benjamin Herrenschmidta28d3af2006-01-07 11:35:26 +1100637 struct device_node *np;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700638
Benjamin Herrenschmidta28d3af2006-01-07 11:35:26 +1100639 for (np = NULL; (np = of_get_next_child(smu->of_node, np)) != NULL;)
Stephen Rothwell55b61fe2007-05-03 17:26:52 +1000640 if (of_device_is_compatible(np, "smu-sensors"))
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100641 of_platform_device_create(np, "smu-sensors",
642 &smu->of_dev->dev);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700643}
644
David Howellsc4028952006-11-22 14:57:56 +0000645static DECLARE_WORK(smu_expose_childs_work, smu_expose_childs);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700646
647static int smu_platform_probe(struct of_device* dev,
648 const struct of_device_id *match)
649{
650 if (!smu)
651 return -ENODEV;
652 smu->of_dev = dev;
653
654 /*
655 * Ok, we are matched, now expose all i2c busses. We have to defer
656 * that unfortunately or it would deadlock inside the device model
657 */
658 schedule_work(&smu_expose_childs_work);
659
660 return 0;
661}
662
663static struct of_device_id smu_platform_match[] =
664{
665 {
666 .type = "smu",
667 },
668 {},
669};
670
671static struct of_platform_driver smu_of_platform_driver =
672{
673 .name = "smu",
674 .match_table = smu_platform_match,
675 .probe = smu_platform_probe,
676};
677
678static int __init smu_init_sysfs(void)
679{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700680 /*
681 * Due to sysfs bogosity, a sysdev is not a real device, so
682 * we should in fact create both if we want sysdev semantics
683 * for power management.
684 * For now, we don't power manage machines with an SMU chip,
685 * I'm a bit too far from figuring out how that works with those
686 * new chipsets, but that will come back and bite us
687 */
Benjamin Herrenschmidt7eebde72006-11-11 17:24:59 +1100688 of_register_platform_driver(&smu_of_platform_driver);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700689 return 0;
690}
691
692device_initcall(smu_init_sysfs);
693
694struct of_device *smu_get_ofdev(void)
695{
696 if (!smu)
697 return NULL;
698 return smu->of_dev;
699}
700
701EXPORT_SYMBOL_GPL(smu_get_ofdev);
702
703/*
704 * i2c interface
705 */
706
707static void smu_i2c_complete_command(struct smu_i2c_cmd *cmd, int fail)
708{
709 void (*done)(struct smu_i2c_cmd *cmd, void *misc) = cmd->done;
710 void *misc = cmd->misc;
711 unsigned long flags;
712
713 /* Check for read case */
714 if (!fail && cmd->read) {
715 if (cmd->pdata[0] < 1)
716 fail = 1;
717 else
718 memcpy(cmd->info.data, &cmd->pdata[1],
719 cmd->info.datalen);
720 }
721
722 DPRINTK("SMU: completing, success: %d\n", !fail);
723
724 /* Update status and mark no pending i2c command with lock
725 * held so nobody comes in while we dequeue an eventual
726 * pending next i2c command
727 */
728 spin_lock_irqsave(&smu->lock, flags);
729 smu->cmd_i2c_cur = NULL;
730 wmb();
731 cmd->status = fail ? -EIO : 0;
732
733 /* Is there another i2c command waiting ? */
734 if (!list_empty(&smu->cmd_i2c_list)) {
735 struct smu_i2c_cmd *newcmd;
736
737 /* Fetch it, new current, remove from list */
738 newcmd = list_entry(smu->cmd_i2c_list.next,
739 struct smu_i2c_cmd, link);
740 smu->cmd_i2c_cur = newcmd;
741 list_del(&cmd->link);
742
743 /* Queue with low level smu */
744 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
745 if (smu->cmd_cur == NULL)
746 smu_start_cmd();
747 }
748 spin_unlock_irqrestore(&smu->lock, flags);
749
750 /* Call command completion handler if any */
751 if (done)
752 done(cmd, misc);
753
754}
755
756
757static void smu_i2c_retry(unsigned long data)
758{
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100759 struct smu_i2c_cmd *cmd = smu->cmd_i2c_cur;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700760
761 DPRINTK("SMU: i2c failure, requeuing...\n");
762
763 /* requeue command simply by resetting reply_len */
764 cmd->pdata[0] = 0xff;
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100765 cmd->scmd.reply_len = sizeof(cmd->pdata);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700766 smu_queue_cmd(&cmd->scmd);
767}
768
769
770static void smu_i2c_low_completion(struct smu_cmd *scmd, void *misc)
771{
772 struct smu_i2c_cmd *cmd = misc;
773 int fail = 0;
774
775 DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n",
776 cmd->stage, scmd->status, cmd->pdata[0], scmd->reply_len);
777
778 /* Check for possible status */
779 if (scmd->status < 0)
780 fail = 1;
781 else if (cmd->read) {
782 if (cmd->stage == 0)
783 fail = cmd->pdata[0] != 0;
784 else
785 fail = cmd->pdata[0] >= 0x80;
786 } else {
787 fail = cmd->pdata[0] != 0;
788 }
789
790 /* Handle failures by requeuing command, after 5ms interval
791 */
792 if (fail && --cmd->retries > 0) {
793 DPRINTK("SMU: i2c failure, starting timer...\n");
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100794 BUG_ON(cmd != smu->cmd_i2c_cur);
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700795 if (!smu_irq_inited) {
796 mdelay(5);
797 smu_i2c_retry(0);
798 return;
799 }
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100800 mod_timer(&smu->i2c_timer, jiffies + msecs_to_jiffies(5));
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700801 return;
802 }
803
804 /* If failure or stage 1, command is complete */
805 if (fail || cmd->stage != 0) {
806 smu_i2c_complete_command(cmd, fail);
807 return;
808 }
809
810 DPRINTK("SMU: going to stage 1\n");
811
812 /* Ok, initial command complete, now poll status */
813 scmd->reply_buf = cmd->pdata;
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100814 scmd->reply_len = sizeof(cmd->pdata);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700815 scmd->data_buf = cmd->pdata;
816 scmd->data_len = 1;
817 cmd->pdata[0] = 0;
818 cmd->stage = 1;
819 cmd->retries = 20;
820 smu_queue_cmd(scmd);
821}
822
823
824int smu_queue_i2c(struct smu_i2c_cmd *cmd)
825{
826 unsigned long flags;
827
828 if (smu == NULL)
829 return -ENODEV;
830
831 /* Fill most fields of scmd */
832 cmd->scmd.cmd = SMU_CMD_I2C_COMMAND;
833 cmd->scmd.done = smu_i2c_low_completion;
834 cmd->scmd.misc = cmd;
835 cmd->scmd.reply_buf = cmd->pdata;
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100836 cmd->scmd.reply_len = sizeof(cmd->pdata);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700837 cmd->scmd.data_buf = (u8 *)(char *)&cmd->info;
838 cmd->scmd.status = 1;
839 cmd->stage = 0;
840 cmd->pdata[0] = 0xff;
841 cmd->retries = 20;
842 cmd->status = 1;
843
844 /* Check transfer type, sanitize some "info" fields
845 * based on transfer type and do more checking
846 */
847 cmd->info.caddr = cmd->info.devaddr;
848 cmd->read = cmd->info.devaddr & 0x01;
849 switch(cmd->info.type) {
850 case SMU_I2C_TRANSFER_SIMPLE:
851 memset(&cmd->info.sublen, 0, 4);
852 break;
853 case SMU_I2C_TRANSFER_COMBINED:
854 cmd->info.devaddr &= 0xfe;
855 case SMU_I2C_TRANSFER_STDSUB:
856 if (cmd->info.sublen > 3)
857 return -EINVAL;
858 break;
859 default:
860 return -EINVAL;
861 }
862
863 /* Finish setting up command based on transfer direction
864 */
865 if (cmd->read) {
866 if (cmd->info.datalen > SMU_I2C_READ_MAX)
867 return -EINVAL;
868 memset(cmd->info.data, 0xff, cmd->info.datalen);
869 cmd->scmd.data_len = 9;
870 } else {
871 if (cmd->info.datalen > SMU_I2C_WRITE_MAX)
872 return -EINVAL;
873 cmd->scmd.data_len = 9 + cmd->info.datalen;
874 }
875
876 DPRINTK("SMU: i2c enqueuing command\n");
877 DPRINTK("SMU: %s, len=%d bus=%x addr=%x sub0=%x type=%x\n",
878 cmd->read ? "read" : "write", cmd->info.datalen,
879 cmd->info.bus, cmd->info.caddr,
880 cmd->info.subaddr[0], cmd->info.type);
881
882
883 /* Enqueue command in i2c list, and if empty, enqueue also in
884 * main command list
885 */
886 spin_lock_irqsave(&smu->lock, flags);
887 if (smu->cmd_i2c_cur == NULL) {
888 smu->cmd_i2c_cur = cmd;
889 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
890 if (smu->cmd_cur == NULL)
891 smu_start_cmd();
892 } else
893 list_add_tail(&cmd->link, &smu->cmd_i2c_list);
894 spin_unlock_irqrestore(&smu->lock, flags);
895
896 return 0;
897}
898
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100899/*
900 * Handling of "partitions"
901 */
902
903static int smu_read_datablock(u8 *dest, unsigned int addr, unsigned int len)
904{
Peter Zijlstra6e9a4732006-09-30 23:28:10 -0700905 DECLARE_COMPLETION_ONSTACK(comp);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100906 unsigned int chunk;
907 struct smu_cmd cmd;
908 int rc;
909 u8 params[8];
910
911 /* We currently use a chunk size of 0xe. We could check the
912 * SMU firmware version and use bigger sizes though
913 */
914 chunk = 0xe;
915
916 while (len) {
917 unsigned int clen = min(len, chunk);
918
919 cmd.cmd = SMU_CMD_MISC_ee_COMMAND;
920 cmd.data_len = 7;
921 cmd.data_buf = params;
922 cmd.reply_len = chunk;
923 cmd.reply_buf = dest;
924 cmd.done = smu_done_complete;
925 cmd.misc = &comp;
926 params[0] = SMU_CMD_MISC_ee_GET_DATABLOCK_REC;
927 params[1] = 0x4;
928 *((u32 *)&params[2]) = addr;
929 params[6] = clen;
930
931 rc = smu_queue_cmd(&cmd);
932 if (rc)
933 return rc;
934 wait_for_completion(&comp);
935 if (cmd.status != 0)
936 return rc;
937 if (cmd.reply_len != clen) {
938 printk(KERN_DEBUG "SMU: short read in "
939 "smu_read_datablock, got: %d, want: %d\n",
940 cmd.reply_len, clen);
941 return -EIO;
942 }
943 len -= clen;
944 addr += clen;
945 dest += clen;
946 }
947 return 0;
948}
949
950static struct smu_sdbp_header *smu_create_sdb_partition(int id)
951{
Peter Zijlstra6e9a4732006-09-30 23:28:10 -0700952 DECLARE_COMPLETION_ONSTACK(comp);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100953 struct smu_simple_cmd cmd;
954 unsigned int addr, len, tlen;
955 struct smu_sdbp_header *hdr;
956 struct property *prop;
957
958 /* First query the partition info */
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100959 DPRINTK("SMU: Query partition infos ... (irq=%d)\n", smu->db_irq);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100960 smu_queue_simple(&cmd, SMU_CMD_PARTITION_COMMAND, 2,
961 smu_done_complete, &comp,
962 SMU_CMD_PARTITION_LATEST, id);
963 wait_for_completion(&comp);
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100964 DPRINTK("SMU: done, status: %d, reply_len: %d\n",
965 cmd.cmd.status, cmd.cmd.reply_len);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100966
967 /* Partition doesn't exist (or other error) */
968 if (cmd.cmd.status != 0 || cmd.cmd.reply_len != 6)
969 return NULL;
970
971 /* Fetch address and length from reply */
972 addr = *((u16 *)cmd.buffer);
973 len = cmd.buffer[3] << 2;
974 /* Calucluate total length to allocate, including the 17 bytes
975 * for "sdb-partition-XX" that we append at the end of the buffer
976 */
977 tlen = sizeof(struct property) + len + 18;
978
Robert P. J. Daycd861282006-12-13 00:34:52 -0800979 prop = kzalloc(tlen, GFP_KERNEL);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100980 if (prop == NULL)
981 return NULL;
982 hdr = (struct smu_sdbp_header *)(prop + 1);
983 prop->name = ((char *)prop) + tlen - 18;
984 sprintf(prop->name, "sdb-partition-%02x", id);
985 prop->length = len;
Stephen Rothwell1a381472007-04-03 10:58:52 +1000986 prop->value = hdr;
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100987 prop->next = NULL;
988
989 /* Read the datablock */
990 if (smu_read_datablock((u8 *)hdr, addr, len)) {
991 printk(KERN_DEBUG "SMU: datablock read failed while reading "
992 "partition %02x !\n", id);
993 goto failure;
994 }
995
996 /* Got it, check a few things and create the property */
997 if (hdr->id != id) {
998 printk(KERN_DEBUG "SMU: Reading partition %02x and got "
999 "%02x !\n", id, hdr->id);
1000 goto failure;
1001 }
1002 if (prom_add_property(smu->of_node, prop)) {
1003 printk(KERN_DEBUG "SMU: Failed creating sdb-partition-%02x "
1004 "property !\n", id);
1005 goto failure;
1006 }
1007
1008 return hdr;
1009 failure:
1010 kfree(prop);
1011 return NULL;
1012}
1013
1014/* Note: Only allowed to return error code in pointers (using ERR_PTR)
1015 * when interruptible is 1
1016 */
Jeremy Kerr018a3d12006-07-12 15:40:29 +10001017const struct smu_sdbp_header *__smu_get_sdb_partition(int id,
1018 unsigned int *size, int interruptible)
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +11001019{
1020 char pname[32];
Jeremy Kerr018a3d12006-07-12 15:40:29 +10001021 const struct smu_sdbp_header *part;
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +11001022
1023 if (!smu)
1024 return NULL;
1025
1026 sprintf(pname, "sdb-partition-%02x", id);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001027
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +11001028 DPRINTK("smu_get_sdb_partition(%02x)\n", id);
1029
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001030 if (interruptible) {
1031 int rc;
Ingo Molnar14cc3e22006-03-26 01:37:14 -08001032 rc = mutex_lock_interruptible(&smu_part_access);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001033 if (rc)
1034 return ERR_PTR(rc);
1035 } else
Ingo Molnar14cc3e22006-03-26 01:37:14 -08001036 mutex_lock(&smu_part_access);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001037
Stephen Rothwell01b27262007-04-27 13:41:15 +10001038 part = of_get_property(smu->of_node, pname, size);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001039 if (part == NULL) {
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +11001040 DPRINTK("trying to extract from SMU ...\n");
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001041 part = smu_create_sdb_partition(id);
1042 if (part != NULL && size)
1043 *size = part->len << 2;
1044 }
Ingo Molnar14cc3e22006-03-26 01:37:14 -08001045 mutex_unlock(&smu_part_access);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001046 return part;
1047}
1048
Jeremy Kerr018a3d12006-07-12 15:40:29 +10001049const struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size)
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001050{
1051 return __smu_get_sdb_partition(id, size, 0);
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +11001052}
1053EXPORT_SYMBOL(smu_get_sdb_partition);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001054
1055
1056/*
1057 * Userland driver interface
1058 */
1059
1060
1061static LIST_HEAD(smu_clist);
1062static DEFINE_SPINLOCK(smu_clist_lock);
1063
1064enum smu_file_mode {
1065 smu_file_commands,
1066 smu_file_events,
1067 smu_file_closing
1068};
1069
1070struct smu_private
1071{
1072 struct list_head list;
1073 enum smu_file_mode mode;
1074 int busy;
1075 struct smu_cmd cmd;
1076 spinlock_t lock;
1077 wait_queue_head_t wait;
1078 u8 buffer[SMU_MAX_DATA];
1079};
1080
1081
1082static int smu_open(struct inode *inode, struct file *file)
1083{
1084 struct smu_private *pp;
1085 unsigned long flags;
1086
Yoann Padioleaudd00cc42007-07-19 01:49:03 -07001087 pp = kzalloc(sizeof(struct smu_private), GFP_KERNEL);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001088 if (pp == 0)
1089 return -ENOMEM;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001090 spin_lock_init(&pp->lock);
1091 pp->mode = smu_file_commands;
1092 init_waitqueue_head(&pp->wait);
1093
Arnd Bergmannb9bde772008-05-20 19:16:11 +02001094 lock_kernel();
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001095 spin_lock_irqsave(&smu_clist_lock, flags);
1096 list_add(&pp->list, &smu_clist);
1097 spin_unlock_irqrestore(&smu_clist_lock, flags);
1098 file->private_data = pp;
Arnd Bergmannb9bde772008-05-20 19:16:11 +02001099 unlock_kernel();
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001100
1101 return 0;
1102}
1103
1104
1105static void smu_user_cmd_done(struct smu_cmd *cmd, void *misc)
1106{
1107 struct smu_private *pp = misc;
1108
1109 wake_up_all(&pp->wait);
1110}
1111
1112
1113static ssize_t smu_write(struct file *file, const char __user *buf,
1114 size_t count, loff_t *ppos)
1115{
1116 struct smu_private *pp = file->private_data;
1117 unsigned long flags;
1118 struct smu_user_cmd_hdr hdr;
1119 int rc = 0;
1120
1121 if (pp->busy)
1122 return -EBUSY;
1123 else if (copy_from_user(&hdr, buf, sizeof(hdr)))
1124 return -EFAULT;
1125 else if (hdr.cmdtype == SMU_CMDTYPE_WANTS_EVENTS) {
1126 pp->mode = smu_file_events;
1127 return 0;
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001128 } else if (hdr.cmdtype == SMU_CMDTYPE_GET_PARTITION) {
Jeremy Kerr018a3d12006-07-12 15:40:29 +10001129 const struct smu_sdbp_header *part;
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001130 part = __smu_get_sdb_partition(hdr.cmd, NULL, 1);
1131 if (part == NULL)
1132 return -EINVAL;
1133 else if (IS_ERR(part))
1134 return PTR_ERR(part);
1135 return 0;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001136 } else if (hdr.cmdtype != SMU_CMDTYPE_SMU)
1137 return -EINVAL;
1138 else if (pp->mode != smu_file_commands)
1139 return -EBADFD;
1140 else if (hdr.data_len > SMU_MAX_DATA)
1141 return -EINVAL;
1142
1143 spin_lock_irqsave(&pp->lock, flags);
1144 if (pp->busy) {
1145 spin_unlock_irqrestore(&pp->lock, flags);
1146 return -EBUSY;
1147 }
1148 pp->busy = 1;
1149 pp->cmd.status = 1;
1150 spin_unlock_irqrestore(&pp->lock, flags);
1151
1152 if (copy_from_user(pp->buffer, buf + sizeof(hdr), hdr.data_len)) {
1153 pp->busy = 0;
1154 return -EFAULT;
1155 }
1156
1157 pp->cmd.cmd = hdr.cmd;
1158 pp->cmd.data_len = hdr.data_len;
1159 pp->cmd.reply_len = SMU_MAX_DATA;
1160 pp->cmd.data_buf = pp->buffer;
1161 pp->cmd.reply_buf = pp->buffer;
1162 pp->cmd.done = smu_user_cmd_done;
1163 pp->cmd.misc = pp;
1164 rc = smu_queue_cmd(&pp->cmd);
1165 if (rc < 0)
1166 return rc;
1167 return count;
1168}
1169
1170
1171static ssize_t smu_read_command(struct file *file, struct smu_private *pp,
1172 char __user *buf, size_t count)
1173{
1174 DECLARE_WAITQUEUE(wait, current);
1175 struct smu_user_reply_hdr hdr;
1176 unsigned long flags;
1177 int size, rc = 0;
1178
1179 if (!pp->busy)
1180 return 0;
1181 if (count < sizeof(struct smu_user_reply_hdr))
1182 return -EOVERFLOW;
1183 spin_lock_irqsave(&pp->lock, flags);
1184 if (pp->cmd.status == 1) {
1185 if (file->f_flags & O_NONBLOCK)
1186 return -EAGAIN;
1187 add_wait_queue(&pp->wait, &wait);
1188 for (;;) {
1189 set_current_state(TASK_INTERRUPTIBLE);
1190 rc = 0;
1191 if (pp->cmd.status != 1)
1192 break;
1193 rc = -ERESTARTSYS;
1194 if (signal_pending(current))
1195 break;
1196 spin_unlock_irqrestore(&pp->lock, flags);
1197 schedule();
1198 spin_lock_irqsave(&pp->lock, flags);
1199 }
1200 set_current_state(TASK_RUNNING);
1201 remove_wait_queue(&pp->wait, &wait);
1202 }
1203 spin_unlock_irqrestore(&pp->lock, flags);
1204 if (rc)
1205 return rc;
1206 if (pp->cmd.status != 0)
1207 pp->cmd.reply_len = 0;
1208 size = sizeof(hdr) + pp->cmd.reply_len;
1209 if (count < size)
1210 size = count;
1211 rc = size;
1212 hdr.status = pp->cmd.status;
1213 hdr.reply_len = pp->cmd.reply_len;
1214 if (copy_to_user(buf, &hdr, sizeof(hdr)))
1215 return -EFAULT;
1216 size -= sizeof(hdr);
1217 if (size && copy_to_user(buf + sizeof(hdr), pp->buffer, size))
1218 return -EFAULT;
1219 pp->busy = 0;
1220
1221 return rc;
1222}
1223
1224
1225static ssize_t smu_read_events(struct file *file, struct smu_private *pp,
1226 char __user *buf, size_t count)
1227{
1228 /* Not implemented */
1229 msleep_interruptible(1000);
1230 return 0;
1231}
1232
1233
1234static ssize_t smu_read(struct file *file, char __user *buf,
1235 size_t count, loff_t *ppos)
1236{
1237 struct smu_private *pp = file->private_data;
1238
1239 if (pp->mode == smu_file_commands)
1240 return smu_read_command(file, pp, buf, count);
1241 if (pp->mode == smu_file_events)
1242 return smu_read_events(file, pp, buf, count);
1243
1244 return -EBADFD;
1245}
1246
1247static unsigned int smu_fpoll(struct file *file, poll_table *wait)
1248{
1249 struct smu_private *pp = file->private_data;
1250 unsigned int mask = 0;
1251 unsigned long flags;
1252
1253 if (pp == 0)
1254 return 0;
1255
1256 if (pp->mode == smu_file_commands) {
1257 poll_wait(file, &pp->wait, wait);
1258
1259 spin_lock_irqsave(&pp->lock, flags);
1260 if (pp->busy && pp->cmd.status != 1)
1261 mask |= POLLIN;
1262 spin_unlock_irqrestore(&pp->lock, flags);
1263 } if (pp->mode == smu_file_events) {
1264 /* Not yet implemented */
1265 }
1266 return mask;
1267}
1268
1269static int smu_release(struct inode *inode, struct file *file)
1270{
1271 struct smu_private *pp = file->private_data;
1272 unsigned long flags;
1273 unsigned int busy;
1274
1275 if (pp == 0)
1276 return 0;
1277
1278 file->private_data = NULL;
1279
1280 /* Mark file as closing to avoid races with new request */
1281 spin_lock_irqsave(&pp->lock, flags);
1282 pp->mode = smu_file_closing;
1283 busy = pp->busy;
1284
1285 /* Wait for any pending request to complete */
1286 if (busy && pp->cmd.status == 1) {
1287 DECLARE_WAITQUEUE(wait, current);
1288
1289 add_wait_queue(&pp->wait, &wait);
1290 for (;;) {
1291 set_current_state(TASK_UNINTERRUPTIBLE);
1292 if (pp->cmd.status != 1)
1293 break;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001294 spin_unlock_irqrestore(&pp->lock, flags);
Andrew Morton94256dd2007-04-16 22:53:25 -07001295 schedule();
1296 spin_lock_irqsave(&pp->lock, flags);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001297 }
1298 set_current_state(TASK_RUNNING);
1299 remove_wait_queue(&pp->wait, &wait);
1300 }
1301 spin_unlock_irqrestore(&pp->lock, flags);
1302
1303 spin_lock_irqsave(&smu_clist_lock, flags);
1304 list_del(&pp->list);
1305 spin_unlock_irqrestore(&smu_clist_lock, flags);
1306 kfree(pp);
1307
1308 return 0;
1309}
1310
1311
Arjan van de Venfa027c22007-02-12 00:55:33 -08001312static const struct file_operations smu_device_fops = {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001313 .llseek = no_llseek,
1314 .read = smu_read,
1315 .write = smu_write,
1316 .poll = smu_fpoll,
1317 .open = smu_open,
1318 .release = smu_release,
1319};
1320
Stephen Rothwell6b67f62c2005-09-27 14:09:39 +10001321static struct miscdevice pmu_device = {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001322 MISC_DYNAMIC_MINOR, "smu", &smu_device_fops
1323};
1324
1325static int smu_device_init(void)
1326{
1327 if (!smu)
1328 return -ENODEV;
1329 if (misc_register(&pmu_device) < 0)
1330 printk(KERN_ERR "via-pmu: cannot register misc device.\n");
1331 return 0;
1332}
1333device_initcall(smu_device_init);