blob: 54ac7ffacb40c9dc6352af3045c836f0162e7b73 [file] [log] [blame]
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
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>
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070035#include <linux/poll.h>
Ingo Molnar14cc3e22006-03-26 01:37:14 -080036#include <linux/mutex.h>
Stephen Rothwellad9e05a2008-05-23 16:27:02 +100037#include <linux/of_device.h>
38#include <linux/of_platform.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090039#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41#include <asm/byteorder.h>
42#include <asm/io.h>
43#include <asm/prom.h>
44#include <asm/machdep.h>
45#include <asm/pmac_feature.h>
46#include <asm/smu.h>
47#include <asm/sections.h>
48#include <asm/abs_addr.h>
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070049#include <asm/uaccess.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;
Grant Likely2dc11582010-08-06 09:25:50 -060076 struct platform_device *of_dev;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070077 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 */
Benjamin Herrenschmidt592a6072008-02-07 14:29:43 +110088 int broken_nap;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070089 struct list_head cmd_i2c_list;
90 struct smu_i2c_cmd *cmd_i2c_cur; /* pending i2c command */
91 struct timer_list i2c_timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092};
93
94/*
95 * I don't think there will ever be more than one SMU, so
96 * for now, just hard code that
97 */
Arnd Bergmannd851b6e2010-06-02 14:28:52 +020098static DEFINE_MUTEX(smu_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099static 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
Grant Likely00006122011-02-22 19:59:54 -0700647static int smu_platform_probe(struct platform_device* dev)
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700648{
649 if (!smu)
650 return -ENODEV;
651 smu->of_dev = dev;
652
653 /*
654 * Ok, we are matched, now expose all i2c busses. We have to defer
655 * that unfortunately or it would deadlock inside the device model
656 */
657 schedule_work(&smu_expose_childs_work);
658
659 return 0;
660}
661
Márton Németh46759a72010-01-10 01:43:14 +0000662static const struct of_device_id smu_platform_match[] =
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700663{
664 {
665 .type = "smu",
666 },
667 {},
668};
669
Grant Likely00006122011-02-22 19:59:54 -0700670static struct platform_driver smu_of_platform_driver =
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700671{
Grant Likely40182942010-04-13 16:13:02 -0700672 .driver = {
673 .name = "smu",
674 .owner = THIS_MODULE,
675 .of_match_table = smu_platform_match,
676 },
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700677 .probe = smu_platform_probe,
678};
679
680static int __init smu_init_sysfs(void)
681{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700682 /*
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700683 * For now, we don't power manage machines with an SMU chip,
684 * I'm a bit too far from figuring out how that works with those
685 * new chipsets, but that will come back and bite us
686 */
Grant Likely00006122011-02-22 19:59:54 -0700687 platform_driver_register(&smu_of_platform_driver);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700688 return 0;
689}
690
691device_initcall(smu_init_sysfs);
692
Grant Likely2dc11582010-08-06 09:25:50 -0600693struct platform_device *smu_get_ofdev(void)
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700694{
695 if (!smu)
696 return NULL;
697 return smu->of_dev;
698}
699
700EXPORT_SYMBOL_GPL(smu_get_ofdev);
701
702/*
703 * i2c interface
704 */
705
706static void smu_i2c_complete_command(struct smu_i2c_cmd *cmd, int fail)
707{
708 void (*done)(struct smu_i2c_cmd *cmd, void *misc) = cmd->done;
709 void *misc = cmd->misc;
710 unsigned long flags;
711
712 /* Check for read case */
713 if (!fail && cmd->read) {
714 if (cmd->pdata[0] < 1)
715 fail = 1;
716 else
717 memcpy(cmd->info.data, &cmd->pdata[1],
718 cmd->info.datalen);
719 }
720
721 DPRINTK("SMU: completing, success: %d\n", !fail);
722
723 /* Update status and mark no pending i2c command with lock
724 * held so nobody comes in while we dequeue an eventual
725 * pending next i2c command
726 */
727 spin_lock_irqsave(&smu->lock, flags);
728 smu->cmd_i2c_cur = NULL;
729 wmb();
730 cmd->status = fail ? -EIO : 0;
731
732 /* Is there another i2c command waiting ? */
733 if (!list_empty(&smu->cmd_i2c_list)) {
734 struct smu_i2c_cmd *newcmd;
735
736 /* Fetch it, new current, remove from list */
737 newcmd = list_entry(smu->cmd_i2c_list.next,
738 struct smu_i2c_cmd, link);
739 smu->cmd_i2c_cur = newcmd;
740 list_del(&cmd->link);
741
742 /* Queue with low level smu */
743 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
744 if (smu->cmd_cur == NULL)
745 smu_start_cmd();
746 }
747 spin_unlock_irqrestore(&smu->lock, flags);
748
749 /* Call command completion handler if any */
750 if (done)
751 done(cmd, misc);
752
753}
754
755
756static void smu_i2c_retry(unsigned long data)
757{
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100758 struct smu_i2c_cmd *cmd = smu->cmd_i2c_cur;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700759
760 DPRINTK("SMU: i2c failure, requeuing...\n");
761
762 /* requeue command simply by resetting reply_len */
763 cmd->pdata[0] = 0xff;
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100764 cmd->scmd.reply_len = sizeof(cmd->pdata);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700765 smu_queue_cmd(&cmd->scmd);
766}
767
768
769static void smu_i2c_low_completion(struct smu_cmd *scmd, void *misc)
770{
771 struct smu_i2c_cmd *cmd = misc;
772 int fail = 0;
773
774 DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n",
775 cmd->stage, scmd->status, cmd->pdata[0], scmd->reply_len);
776
777 /* Check for possible status */
778 if (scmd->status < 0)
779 fail = 1;
780 else if (cmd->read) {
781 if (cmd->stage == 0)
782 fail = cmd->pdata[0] != 0;
783 else
784 fail = cmd->pdata[0] >= 0x80;
785 } else {
786 fail = cmd->pdata[0] != 0;
787 }
788
789 /* Handle failures by requeuing command, after 5ms interval
790 */
791 if (fail && --cmd->retries > 0) {
792 DPRINTK("SMU: i2c failure, starting timer...\n");
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100793 BUG_ON(cmd != smu->cmd_i2c_cur);
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700794 if (!smu_irq_inited) {
795 mdelay(5);
796 smu_i2c_retry(0);
797 return;
798 }
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100799 mod_timer(&smu->i2c_timer, jiffies + msecs_to_jiffies(5));
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700800 return;
801 }
802
803 /* If failure or stage 1, command is complete */
804 if (fail || cmd->stage != 0) {
805 smu_i2c_complete_command(cmd, fail);
806 return;
807 }
808
809 DPRINTK("SMU: going to stage 1\n");
810
811 /* Ok, initial command complete, now poll status */
812 scmd->reply_buf = cmd->pdata;
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100813 scmd->reply_len = sizeof(cmd->pdata);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700814 scmd->data_buf = cmd->pdata;
815 scmd->data_len = 1;
816 cmd->pdata[0] = 0;
817 cmd->stage = 1;
818 cmd->retries = 20;
819 smu_queue_cmd(scmd);
820}
821
822
823int smu_queue_i2c(struct smu_i2c_cmd *cmd)
824{
825 unsigned long flags;
826
827 if (smu == NULL)
828 return -ENODEV;
829
830 /* Fill most fields of scmd */
831 cmd->scmd.cmd = SMU_CMD_I2C_COMMAND;
832 cmd->scmd.done = smu_i2c_low_completion;
833 cmd->scmd.misc = cmd;
834 cmd->scmd.reply_buf = cmd->pdata;
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100835 cmd->scmd.reply_len = sizeof(cmd->pdata);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700836 cmd->scmd.data_buf = (u8 *)(char *)&cmd->info;
837 cmd->scmd.status = 1;
838 cmd->stage = 0;
839 cmd->pdata[0] = 0xff;
840 cmd->retries = 20;
841 cmd->status = 1;
842
843 /* Check transfer type, sanitize some "info" fields
844 * based on transfer type and do more checking
845 */
846 cmd->info.caddr = cmd->info.devaddr;
847 cmd->read = cmd->info.devaddr & 0x01;
848 switch(cmd->info.type) {
849 case SMU_I2C_TRANSFER_SIMPLE:
850 memset(&cmd->info.sublen, 0, 4);
851 break;
852 case SMU_I2C_TRANSFER_COMBINED:
853 cmd->info.devaddr &= 0xfe;
854 case SMU_I2C_TRANSFER_STDSUB:
855 if (cmd->info.sublen > 3)
856 return -EINVAL;
857 break;
858 default:
859 return -EINVAL;
860 }
861
862 /* Finish setting up command based on transfer direction
863 */
864 if (cmd->read) {
865 if (cmd->info.datalen > SMU_I2C_READ_MAX)
866 return -EINVAL;
867 memset(cmd->info.data, 0xff, cmd->info.datalen);
868 cmd->scmd.data_len = 9;
869 } else {
870 if (cmd->info.datalen > SMU_I2C_WRITE_MAX)
871 return -EINVAL;
872 cmd->scmd.data_len = 9 + cmd->info.datalen;
873 }
874
875 DPRINTK("SMU: i2c enqueuing command\n");
876 DPRINTK("SMU: %s, len=%d bus=%x addr=%x sub0=%x type=%x\n",
877 cmd->read ? "read" : "write", cmd->info.datalen,
878 cmd->info.bus, cmd->info.caddr,
879 cmd->info.subaddr[0], cmd->info.type);
880
881
882 /* Enqueue command in i2c list, and if empty, enqueue also in
883 * main command list
884 */
885 spin_lock_irqsave(&smu->lock, flags);
886 if (smu->cmd_i2c_cur == NULL) {
887 smu->cmd_i2c_cur = cmd;
888 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
889 if (smu->cmd_cur == NULL)
890 smu_start_cmd();
891 } else
892 list_add_tail(&cmd->link, &smu->cmd_i2c_list);
893 spin_unlock_irqrestore(&smu->lock, flags);
894
895 return 0;
896}
897
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100898/*
899 * Handling of "partitions"
900 */
901
902static int smu_read_datablock(u8 *dest, unsigned int addr, unsigned int len)
903{
Peter Zijlstra6e9a4732006-09-30 23:28:10 -0700904 DECLARE_COMPLETION_ONSTACK(comp);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100905 unsigned int chunk;
906 struct smu_cmd cmd;
907 int rc;
908 u8 params[8];
909
910 /* We currently use a chunk size of 0xe. We could check the
911 * SMU firmware version and use bigger sizes though
912 */
913 chunk = 0xe;
914
915 while (len) {
916 unsigned int clen = min(len, chunk);
917
918 cmd.cmd = SMU_CMD_MISC_ee_COMMAND;
919 cmd.data_len = 7;
920 cmd.data_buf = params;
921 cmd.reply_len = chunk;
922 cmd.reply_buf = dest;
923 cmd.done = smu_done_complete;
924 cmd.misc = &comp;
925 params[0] = SMU_CMD_MISC_ee_GET_DATABLOCK_REC;
926 params[1] = 0x4;
927 *((u32 *)&params[2]) = addr;
928 params[6] = clen;
929
930 rc = smu_queue_cmd(&cmd);
931 if (rc)
932 return rc;
933 wait_for_completion(&comp);
934 if (cmd.status != 0)
935 return rc;
936 if (cmd.reply_len != clen) {
937 printk(KERN_DEBUG "SMU: short read in "
938 "smu_read_datablock, got: %d, want: %d\n",
939 cmd.reply_len, clen);
940 return -EIO;
941 }
942 len -= clen;
943 addr += clen;
944 dest += clen;
945 }
946 return 0;
947}
948
949static struct smu_sdbp_header *smu_create_sdb_partition(int id)
950{
Peter Zijlstra6e9a4732006-09-30 23:28:10 -0700951 DECLARE_COMPLETION_ONSTACK(comp);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100952 struct smu_simple_cmd cmd;
953 unsigned int addr, len, tlen;
954 struct smu_sdbp_header *hdr;
955 struct property *prop;
956
957 /* First query the partition info */
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100958 DPRINTK("SMU: Query partition infos ... (irq=%d)\n", smu->db_irq);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100959 smu_queue_simple(&cmd, SMU_CMD_PARTITION_COMMAND, 2,
960 smu_done_complete, &comp,
961 SMU_CMD_PARTITION_LATEST, id);
962 wait_for_completion(&comp);
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100963 DPRINTK("SMU: done, status: %d, reply_len: %d\n",
964 cmd.cmd.status, cmd.cmd.reply_len);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100965
966 /* Partition doesn't exist (or other error) */
967 if (cmd.cmd.status != 0 || cmd.cmd.reply_len != 6)
968 return NULL;
969
970 /* Fetch address and length from reply */
971 addr = *((u16 *)cmd.buffer);
972 len = cmd.buffer[3] << 2;
973 /* Calucluate total length to allocate, including the 17 bytes
974 * for "sdb-partition-XX" that we append at the end of the buffer
975 */
976 tlen = sizeof(struct property) + len + 18;
977
Robert P. J. Daycd861282006-12-13 00:34:52 -0800978 prop = kzalloc(tlen, GFP_KERNEL);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100979 if (prop == NULL)
980 return NULL;
981 hdr = (struct smu_sdbp_header *)(prop + 1);
982 prop->name = ((char *)prop) + tlen - 18;
983 sprintf(prop->name, "sdb-partition-%02x", id);
984 prop->length = len;
Stephen Rothwell1a381472007-04-03 10:58:52 +1000985 prop->value = hdr;
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100986 prop->next = NULL;
987
988 /* Read the datablock */
989 if (smu_read_datablock((u8 *)hdr, addr, len)) {
990 printk(KERN_DEBUG "SMU: datablock read failed while reading "
991 "partition %02x !\n", id);
992 goto failure;
993 }
994
995 /* Got it, check a few things and create the property */
996 if (hdr->id != id) {
997 printk(KERN_DEBUG "SMU: Reading partition %02x and got "
998 "%02x !\n", id, hdr->id);
999 goto failure;
1000 }
1001 if (prom_add_property(smu->of_node, prop)) {
1002 printk(KERN_DEBUG "SMU: Failed creating sdb-partition-%02x "
1003 "property !\n", id);
1004 goto failure;
1005 }
1006
1007 return hdr;
1008 failure:
1009 kfree(prop);
1010 return NULL;
1011}
1012
1013/* Note: Only allowed to return error code in pointers (using ERR_PTR)
1014 * when interruptible is 1
1015 */
Jeremy Kerr018a3d12006-07-12 15:40:29 +10001016const struct smu_sdbp_header *__smu_get_sdb_partition(int id,
1017 unsigned int *size, int interruptible)
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +11001018{
1019 char pname[32];
Jeremy Kerr018a3d12006-07-12 15:40:29 +10001020 const struct smu_sdbp_header *part;
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +11001021
1022 if (!smu)
1023 return NULL;
1024
1025 sprintf(pname, "sdb-partition-%02x", id);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001026
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +11001027 DPRINTK("smu_get_sdb_partition(%02x)\n", id);
1028
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001029 if (interruptible) {
1030 int rc;
Ingo Molnar14cc3e22006-03-26 01:37:14 -08001031 rc = mutex_lock_interruptible(&smu_part_access);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001032 if (rc)
1033 return ERR_PTR(rc);
1034 } else
Ingo Molnar14cc3e22006-03-26 01:37:14 -08001035 mutex_lock(&smu_part_access);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001036
Stephen Rothwell01b27262007-04-27 13:41:15 +10001037 part = of_get_property(smu->of_node, pname, size);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001038 if (part == NULL) {
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +11001039 DPRINTK("trying to extract from SMU ...\n");
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001040 part = smu_create_sdb_partition(id);
1041 if (part != NULL && size)
1042 *size = part->len << 2;
1043 }
Ingo Molnar14cc3e22006-03-26 01:37:14 -08001044 mutex_unlock(&smu_part_access);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001045 return part;
1046}
1047
Jeremy Kerr018a3d12006-07-12 15:40:29 +10001048const struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size)
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001049{
1050 return __smu_get_sdb_partition(id, size, 0);
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +11001051}
1052EXPORT_SYMBOL(smu_get_sdb_partition);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001053
1054
1055/*
1056 * Userland driver interface
1057 */
1058
1059
1060static LIST_HEAD(smu_clist);
1061static DEFINE_SPINLOCK(smu_clist_lock);
1062
1063enum smu_file_mode {
1064 smu_file_commands,
1065 smu_file_events,
1066 smu_file_closing
1067};
1068
1069struct smu_private
1070{
1071 struct list_head list;
1072 enum smu_file_mode mode;
1073 int busy;
1074 struct smu_cmd cmd;
1075 spinlock_t lock;
1076 wait_queue_head_t wait;
1077 u8 buffer[SMU_MAX_DATA];
1078};
1079
1080
1081static int smu_open(struct inode *inode, struct file *file)
1082{
1083 struct smu_private *pp;
1084 unsigned long flags;
1085
Yoann Padioleaudd00cc42007-07-19 01:49:03 -07001086 pp = kzalloc(sizeof(struct smu_private), GFP_KERNEL);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001087 if (pp == 0)
1088 return -ENOMEM;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001089 spin_lock_init(&pp->lock);
1090 pp->mode = smu_file_commands;
1091 init_waitqueue_head(&pp->wait);
1092
Arnd Bergmannd851b6e2010-06-02 14:28:52 +02001093 mutex_lock(&smu_mutex);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001094 spin_lock_irqsave(&smu_clist_lock, flags);
1095 list_add(&pp->list, &smu_clist);
1096 spin_unlock_irqrestore(&smu_clist_lock, flags);
1097 file->private_data = pp;
Arnd Bergmannd851b6e2010-06-02 14:28:52 +02001098 mutex_unlock(&smu_mutex);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001099
1100 return 0;
1101}
1102
1103
1104static void smu_user_cmd_done(struct smu_cmd *cmd, void *misc)
1105{
1106 struct smu_private *pp = misc;
1107
1108 wake_up_all(&pp->wait);
1109}
1110
1111
1112static ssize_t smu_write(struct file *file, const char __user *buf,
1113 size_t count, loff_t *ppos)
1114{
1115 struct smu_private *pp = file->private_data;
1116 unsigned long flags;
1117 struct smu_user_cmd_hdr hdr;
1118 int rc = 0;
1119
1120 if (pp->busy)
1121 return -EBUSY;
1122 else if (copy_from_user(&hdr, buf, sizeof(hdr)))
1123 return -EFAULT;
1124 else if (hdr.cmdtype == SMU_CMDTYPE_WANTS_EVENTS) {
1125 pp->mode = smu_file_events;
1126 return 0;
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001127 } else if (hdr.cmdtype == SMU_CMDTYPE_GET_PARTITION) {
Jeremy Kerr018a3d12006-07-12 15:40:29 +10001128 const struct smu_sdbp_header *part;
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001129 part = __smu_get_sdb_partition(hdr.cmd, NULL, 1);
1130 if (part == NULL)
1131 return -EINVAL;
1132 else if (IS_ERR(part))
1133 return PTR_ERR(part);
1134 return 0;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001135 } else if (hdr.cmdtype != SMU_CMDTYPE_SMU)
1136 return -EINVAL;
1137 else if (pp->mode != smu_file_commands)
1138 return -EBADFD;
1139 else if (hdr.data_len > SMU_MAX_DATA)
1140 return -EINVAL;
1141
1142 spin_lock_irqsave(&pp->lock, flags);
1143 if (pp->busy) {
1144 spin_unlock_irqrestore(&pp->lock, flags);
1145 return -EBUSY;
1146 }
1147 pp->busy = 1;
1148 pp->cmd.status = 1;
1149 spin_unlock_irqrestore(&pp->lock, flags);
1150
1151 if (copy_from_user(pp->buffer, buf + sizeof(hdr), hdr.data_len)) {
1152 pp->busy = 0;
1153 return -EFAULT;
1154 }
1155
1156 pp->cmd.cmd = hdr.cmd;
1157 pp->cmd.data_len = hdr.data_len;
1158 pp->cmd.reply_len = SMU_MAX_DATA;
1159 pp->cmd.data_buf = pp->buffer;
1160 pp->cmd.reply_buf = pp->buffer;
1161 pp->cmd.done = smu_user_cmd_done;
1162 pp->cmd.misc = pp;
1163 rc = smu_queue_cmd(&pp->cmd);
1164 if (rc < 0)
1165 return rc;
1166 return count;
1167}
1168
1169
1170static ssize_t smu_read_command(struct file *file, struct smu_private *pp,
1171 char __user *buf, size_t count)
1172{
1173 DECLARE_WAITQUEUE(wait, current);
1174 struct smu_user_reply_hdr hdr;
1175 unsigned long flags;
1176 int size, rc = 0;
1177
1178 if (!pp->busy)
1179 return 0;
1180 if (count < sizeof(struct smu_user_reply_hdr))
1181 return -EOVERFLOW;
1182 spin_lock_irqsave(&pp->lock, flags);
1183 if (pp->cmd.status == 1) {
Julia Lawall86e47542010-03-29 05:34:46 +00001184 if (file->f_flags & O_NONBLOCK) {
1185 spin_unlock_irqrestore(&pp->lock, flags);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001186 return -EAGAIN;
Julia Lawall86e47542010-03-29 05:34:46 +00001187 }
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001188 add_wait_queue(&pp->wait, &wait);
1189 for (;;) {
1190 set_current_state(TASK_INTERRUPTIBLE);
1191 rc = 0;
1192 if (pp->cmd.status != 1)
1193 break;
1194 rc = -ERESTARTSYS;
1195 if (signal_pending(current))
1196 break;
1197 spin_unlock_irqrestore(&pp->lock, flags);
1198 schedule();
1199 spin_lock_irqsave(&pp->lock, flags);
1200 }
1201 set_current_state(TASK_RUNNING);
1202 remove_wait_queue(&pp->wait, &wait);
1203 }
1204 spin_unlock_irqrestore(&pp->lock, flags);
1205 if (rc)
1206 return rc;
1207 if (pp->cmd.status != 0)
1208 pp->cmd.reply_len = 0;
1209 size = sizeof(hdr) + pp->cmd.reply_len;
1210 if (count < size)
1211 size = count;
1212 rc = size;
1213 hdr.status = pp->cmd.status;
1214 hdr.reply_len = pp->cmd.reply_len;
1215 if (copy_to_user(buf, &hdr, sizeof(hdr)))
1216 return -EFAULT;
1217 size -= sizeof(hdr);
1218 if (size && copy_to_user(buf + sizeof(hdr), pp->buffer, size))
1219 return -EFAULT;
1220 pp->busy = 0;
1221
1222 return rc;
1223}
1224
1225
1226static ssize_t smu_read_events(struct file *file, struct smu_private *pp,
1227 char __user *buf, size_t count)
1228{
1229 /* Not implemented */
1230 msleep_interruptible(1000);
1231 return 0;
1232}
1233
1234
1235static ssize_t smu_read(struct file *file, char __user *buf,
1236 size_t count, loff_t *ppos)
1237{
1238 struct smu_private *pp = file->private_data;
1239
1240 if (pp->mode == smu_file_commands)
1241 return smu_read_command(file, pp, buf, count);
1242 if (pp->mode == smu_file_events)
1243 return smu_read_events(file, pp, buf, count);
1244
1245 return -EBADFD;
1246}
1247
1248static unsigned int smu_fpoll(struct file *file, poll_table *wait)
1249{
1250 struct smu_private *pp = file->private_data;
1251 unsigned int mask = 0;
1252 unsigned long flags;
1253
1254 if (pp == 0)
1255 return 0;
1256
1257 if (pp->mode == smu_file_commands) {
1258 poll_wait(file, &pp->wait, wait);
1259
1260 spin_lock_irqsave(&pp->lock, flags);
1261 if (pp->busy && pp->cmd.status != 1)
1262 mask |= POLLIN;
1263 spin_unlock_irqrestore(&pp->lock, flags);
1264 } if (pp->mode == smu_file_events) {
1265 /* Not yet implemented */
1266 }
1267 return mask;
1268}
1269
1270static int smu_release(struct inode *inode, struct file *file)
1271{
1272 struct smu_private *pp = file->private_data;
1273 unsigned long flags;
1274 unsigned int busy;
1275
1276 if (pp == 0)
1277 return 0;
1278
1279 file->private_data = NULL;
1280
1281 /* Mark file as closing to avoid races with new request */
1282 spin_lock_irqsave(&pp->lock, flags);
1283 pp->mode = smu_file_closing;
1284 busy = pp->busy;
1285
1286 /* Wait for any pending request to complete */
1287 if (busy && pp->cmd.status == 1) {
1288 DECLARE_WAITQUEUE(wait, current);
1289
1290 add_wait_queue(&pp->wait, &wait);
1291 for (;;) {
1292 set_current_state(TASK_UNINTERRUPTIBLE);
1293 if (pp->cmd.status != 1)
1294 break;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001295 spin_unlock_irqrestore(&pp->lock, flags);
Andrew Morton94256dd2007-04-16 22:53:25 -07001296 schedule();
1297 spin_lock_irqsave(&pp->lock, flags);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001298 }
1299 set_current_state(TASK_RUNNING);
1300 remove_wait_queue(&pp->wait, &wait);
1301 }
1302 spin_unlock_irqrestore(&pp->lock, flags);
1303
1304 spin_lock_irqsave(&smu_clist_lock, flags);
1305 list_del(&pp->list);
1306 spin_unlock_irqrestore(&smu_clist_lock, flags);
1307 kfree(pp);
1308
1309 return 0;
1310}
1311
1312
Arjan van de Venfa027c22007-02-12 00:55:33 -08001313static const struct file_operations smu_device_fops = {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001314 .llseek = no_llseek,
1315 .read = smu_read,
1316 .write = smu_write,
1317 .poll = smu_fpoll,
1318 .open = smu_open,
1319 .release = smu_release,
1320};
1321
Stephen Rothwell6b67f62c2005-09-27 14:09:39 +10001322static struct miscdevice pmu_device = {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001323 MISC_DYNAMIC_MINOR, "smu", &smu_device_fops
1324};
1325
1326static int smu_device_init(void)
1327{
1328 if (!smu)
1329 return -ENODEV;
1330 if (misc_register(&pmu_device) < 0)
1331 printk(KERN_ERR "via-pmu: cannot register misc device.\n");
1332 return 0;
1333}
1334device_initcall(smu_device_init);