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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/types.h>
23#include <linux/kernel.h>
24#include <linux/device.h>
25#include <linux/dmapool.h>
26#include <linux/bootmem.h>
27#include <linux/vmalloc.h>
28#include <linux/highmem.h>
29#include <linux/jiffies.h>
30#include <linux/interrupt.h>
31#include <linux/rtc.h>
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070032#include <linux/completion.h>
33#include <linux/miscdevice.h>
34#include <linux/delay.h>
35#include <linux/sysdev.h>
36#include <linux/poll.h>
Ingo Molnar14cc3e22006-03-26 01:37:14 -080037#include <linux/mutex.h>
Stephen Rothwellad9e05a2008-05-23 16:27:02 +100038#include <linux/of_device.h>
39#include <linux/of_platform.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090040#include <linux/slab.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;
Grant Likely2dc11582010-08-06 09:25:50 -060077 struct platform_device *of_dev;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070078 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 */
Arnd Bergmannd851b6e2010-06-02 14:28:52 +020099static DEFINE_MUTEX(smu_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100static struct smu_device *smu;
Ingo Molnar14cc3e22006-03-26 01:37:14 -0800101static DEFINE_MUTEX(smu_part_access);
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700102static int smu_irq_inited;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700103
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100104static void smu_i2c_retry(unsigned long data);
105
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106/*
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700107 * SMU driver low level stuff
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700110static void smu_start_cmd(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700112 unsigned long faddr, fend;
113 struct smu_cmd *cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700115 if (list_empty(&smu->cmd_list))
116 return;
117
118 /* Fetch first command in queue */
119 cmd = list_entry(smu->cmd_list.next, struct smu_cmd, link);
120 smu->cmd_cur = cmd;
121 list_del(&cmd->link);
122
123 DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd->cmd,
124 cmd->data_len);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100125 DPRINTK("SMU: data buffer: %02x %02x %02x %02x %02x %02x %02x %02x\n",
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700126 ((u8 *)cmd->data_buf)[0], ((u8 *)cmd->data_buf)[1],
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100127 ((u8 *)cmd->data_buf)[2], ((u8 *)cmd->data_buf)[3],
128 ((u8 *)cmd->data_buf)[4], ((u8 *)cmd->data_buf)[5],
129 ((u8 *)cmd->data_buf)[6], ((u8 *)cmd->data_buf)[7]);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700130
131 /* Fill the SMU command buffer */
132 smu->cmd_buf->cmd = cmd->cmd;
133 smu->cmd_buf->length = cmd->data_len;
134 memcpy(smu->cmd_buf->data, cmd->data_buf, cmd->data_len);
135
136 /* Flush command and data to RAM */
137 faddr = (unsigned long)smu->cmd_buf;
138 fend = faddr + smu->cmd_buf->length + 2;
139 flush_inval_dcache_range(faddr, fend);
140
Benjamin Herrenschmidt592a6072008-02-07 14:29:43 +1100141
142 /* We also disable NAP mode for the duration of the command
143 * on U3 based machines.
144 * This is slightly racy as it can be written back to 1 by a sysctl
145 * but that never happens in practice. There seem to be an issue with
146 * U3 based machines such as the iMac G5 where napping for the
147 * whole duration of the command prevents the SMU from fetching it
148 * from memory. This might be related to the strange i2c based
149 * mechanism the SMU uses to access memory.
150 */
151 if (smu->broken_nap)
152 powersave_nap = 0;
153
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700154 /* This isn't exactly a DMA mapping here, I suspect
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 * the SMU is actually communicating with us via i2c to the
156 * northbridge or the CPU to access RAM.
157 */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700158 writel(smu->cmd_buf_abs, smu->db_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160 /* Ring the SMU doorbell */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700161 pmac_do_feature_call(PMAC_FTR_WRITE_GPIO, NULL, smu->doorbell, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162}
163
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700164
David Howells7d12e782006-10-05 14:55:46 +0100165static irqreturn_t smu_db_intr(int irq, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700167 unsigned long flags;
168 struct smu_cmd *cmd;
169 void (*done)(struct smu_cmd *cmd, void *misc) = NULL;
170 void *misc = NULL;
171 u8 gpio;
172 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700174 /* SMU completed the command, well, we hope, let's make sure
175 * of it
176 */
177 spin_lock_irqsave(&smu->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700179 gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
Benjamin Herrenschmidta44fe132005-09-30 08:25:17 +1000180 if ((gpio & 7) != 7) {
181 spin_unlock_irqrestore(&smu->lock, flags);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700182 return IRQ_HANDLED;
Benjamin Herrenschmidta44fe132005-09-30 08:25:17 +1000183 }
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700184
185 cmd = smu->cmd_cur;
186 smu->cmd_cur = NULL;
187 if (cmd == NULL)
188 goto bail;
189
190 if (rc == 0) {
191 unsigned long faddr;
192 int reply_len;
193 u8 ack;
194
195 /* CPU might have brought back the cache line, so we need
196 * to flush again before peeking at the SMU response. We
197 * flush the entire buffer for now as we haven't read the
Paulius Zaleckasefad798b2008-02-03 15:42:53 +0200198 * reply length (it's only 2 cache lines anyway)
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700199 */
200 faddr = (unsigned long)smu->cmd_buf;
201 flush_inval_dcache_range(faddr, faddr + 256);
202
203 /* Now check ack */
204 ack = (~cmd->cmd) & 0xff;
205 if (ack != smu->cmd_buf->cmd) {
206 DPRINTK("SMU: incorrect ack, want %x got %x\n",
207 ack, smu->cmd_buf->cmd);
208 rc = -EIO;
209 }
210 reply_len = rc == 0 ? smu->cmd_buf->length : 0;
211 DPRINTK("SMU: reply len: %d\n", reply_len);
212 if (reply_len > cmd->reply_len) {
213 printk(KERN_WARNING "SMU: reply buffer too small,"
214 "got %d bytes for a %d bytes buffer\n",
215 reply_len, cmd->reply_len);
216 reply_len = cmd->reply_len;
217 }
218 cmd->reply_len = reply_len;
219 if (cmd->reply_buf && reply_len)
220 memcpy(cmd->reply_buf, smu->cmd_buf->data, reply_len);
221 }
222
223 /* Now complete the command. Write status last in order as we lost
224 * ownership of the command structure as soon as it's no longer -1
225 */
226 done = cmd->done;
227 misc = cmd->misc;
228 mb();
229 cmd->status = rc;
Benjamin Herrenschmidt592a6072008-02-07 14:29:43 +1100230
231 /* Re-enable NAP mode */
232 if (smu->broken_nap)
233 powersave_nap = 1;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700234 bail:
235 /* Start next command if any */
236 smu_start_cmd();
237 spin_unlock_irqrestore(&smu->lock, flags);
238
239 /* Call command completion handler if any */
240 if (done)
241 done(cmd, misc);
242
243 /* It's an edge interrupt, nothing to do */
244 return IRQ_HANDLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245}
246
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700247
David Howells7d12e782006-10-05 14:55:46 +0100248static irqreturn_t smu_msg_intr(int irq, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700250 /* I don't quite know what to do with this one, we seem to never
251 * receive it, so I suspect we have to arm it someway in the SMU
252 * to start getting events that way.
253 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700255 printk(KERN_INFO "SMU: message interrupt !\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700257 /* It's an edge interrupt, nothing to do */
258 return IRQ_HANDLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259}
260
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700261
262/*
263 * Queued command management.
264 *
265 */
266
267int smu_queue_cmd(struct smu_cmd *cmd)
268{
269 unsigned long flags;
270
271 if (smu == NULL)
272 return -ENODEV;
273 if (cmd->data_len > SMU_MAX_DATA ||
274 cmd->reply_len > SMU_MAX_DATA)
275 return -EINVAL;
276
277 cmd->status = 1;
278 spin_lock_irqsave(&smu->lock, flags);
279 list_add_tail(&cmd->link, &smu->cmd_list);
280 if (smu->cmd_cur == NULL)
281 smu_start_cmd();
282 spin_unlock_irqrestore(&smu->lock, flags);
283
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700284 /* Workaround for early calls when irq isn't available */
285 if (!smu_irq_inited || smu->db_irq == NO_IRQ)
286 smu_spinwait_cmd(cmd);
287
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700288 return 0;
289}
290EXPORT_SYMBOL(smu_queue_cmd);
291
292
293int smu_queue_simple(struct smu_simple_cmd *scmd, u8 command,
294 unsigned int data_len,
295 void (*done)(struct smu_cmd *cmd, void *misc),
296 void *misc, ...)
297{
298 struct smu_cmd *cmd = &scmd->cmd;
299 va_list list;
300 int i;
301
302 if (data_len > sizeof(scmd->buffer))
303 return -EINVAL;
304
305 memset(scmd, 0, sizeof(*scmd));
306 cmd->cmd = command;
307 cmd->data_len = data_len;
308 cmd->data_buf = scmd->buffer;
309 cmd->reply_len = sizeof(scmd->buffer);
310 cmd->reply_buf = scmd->buffer;
311 cmd->done = done;
312 cmd->misc = misc;
313
314 va_start(list, misc);
315 for (i = 0; i < data_len; ++i)
316 scmd->buffer[i] = (u8)va_arg(list, int);
317 va_end(list);
318
319 return smu_queue_cmd(cmd);
320}
321EXPORT_SYMBOL(smu_queue_simple);
322
323
324void smu_poll(void)
325{
326 u8 gpio;
327
328 if (smu == NULL)
329 return;
330
331 gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
332 if ((gpio & 7) == 7)
David Howells7d12e782006-10-05 14:55:46 +0100333 smu_db_intr(smu->db_irq, smu);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700334}
335EXPORT_SYMBOL(smu_poll);
336
337
338void smu_done_complete(struct smu_cmd *cmd, void *misc)
339{
340 struct completion *comp = misc;
341
342 complete(comp);
343}
344EXPORT_SYMBOL(smu_done_complete);
345
346
347void smu_spinwait_cmd(struct smu_cmd *cmd)
348{
349 while(cmd->status == 1)
350 smu_poll();
351}
352EXPORT_SYMBOL(smu_spinwait_cmd);
353
354
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355/* RTC low level commands */
356static inline int bcd2hex (int n)
357{
358 return (((n & 0xf0) >> 4) * 10) + (n & 0xf);
359}
360
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700361
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362static inline int hex2bcd (int n)
363{
364 return ((n / 10) << 4) + (n % 10);
365}
366
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367
368static inline void smu_fill_set_rtc_cmd(struct smu_cmd_buf *cmd_buf,
369 struct rtc_time *time)
370{
371 cmd_buf->cmd = 0x8e;
372 cmd_buf->length = 8;
373 cmd_buf->data[0] = 0x80;
374 cmd_buf->data[1] = hex2bcd(time->tm_sec);
375 cmd_buf->data[2] = hex2bcd(time->tm_min);
376 cmd_buf->data[3] = hex2bcd(time->tm_hour);
377 cmd_buf->data[4] = time->tm_wday;
378 cmd_buf->data[5] = hex2bcd(time->tm_mday);
379 cmd_buf->data[6] = hex2bcd(time->tm_mon) + 1;
380 cmd_buf->data[7] = hex2bcd(time->tm_year - 100);
381}
382
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700384int smu_get_rtc_time(struct rtc_time *time, int spinwait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700386 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 int rc;
388
389 if (smu == NULL)
390 return -ENODEV;
391
392 memset(time, 0, sizeof(struct rtc_time));
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700393 rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 1, NULL, NULL,
394 SMU_CMD_RTC_GET_DATETIME);
395 if (rc)
396 return rc;
397 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700399 time->tm_sec = bcd2hex(cmd.buffer[0]);
400 time->tm_min = bcd2hex(cmd.buffer[1]);
401 time->tm_hour = bcd2hex(cmd.buffer[2]);
402 time->tm_wday = bcd2hex(cmd.buffer[3]);
403 time->tm_mday = bcd2hex(cmd.buffer[4]);
404 time->tm_mon = bcd2hex(cmd.buffer[5]) - 1;
405 time->tm_year = bcd2hex(cmd.buffer[6]) + 100;
406
407 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408}
409
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700410
411int smu_set_rtc_time(struct rtc_time *time, int spinwait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700413 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 int rc;
415
416 if (smu == NULL)
417 return -ENODEV;
418
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700419 rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 8, NULL, NULL,
420 SMU_CMD_RTC_SET_DATETIME,
421 hex2bcd(time->tm_sec),
422 hex2bcd(time->tm_min),
423 hex2bcd(time->tm_hour),
424 time->tm_wday,
425 hex2bcd(time->tm_mday),
426 hex2bcd(time->tm_mon) + 1,
427 hex2bcd(time->tm_year - 100));
428 if (rc)
429 return rc;
430 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700432 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433}
434
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700435
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436void smu_shutdown(void)
437{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700438 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
440 if (smu == NULL)
441 return;
442
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700443 if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 9, NULL, NULL,
444 'S', 'H', 'U', 'T', 'D', 'O', 'W', 'N', 0))
445 return;
446 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 for (;;)
448 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449}
450
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700451
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452void smu_restart(void)
453{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700454 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
456 if (smu == NULL)
457 return;
458
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700459 if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, NULL, NULL,
460 'R', 'E', 'S', 'T', 'A', 'R', 'T', 0))
461 return;
462 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 for (;;)
464 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465}
466
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468int smu_present(void)
469{
470 return smu != NULL;
471}
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700472EXPORT_SYMBOL(smu_present);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
474
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100475int __init smu_init (void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476{
477 struct device_node *np;
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000478 const u32 *data;
Julia Lawall73f38fe2008-06-24 04:14:52 +1000479 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
481 np = of_find_node_by_type(NULL, "smu");
482 if (np == NULL)
483 return -ENODEV;
484
Benjamin Herrenschmidt592a6072008-02-07 14:29:43 +1100485 printk(KERN_INFO "SMU: Driver %s %s\n", VERSION, AUTHOR);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700486
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 if (smu_cmdbuf_abs == 0) {
488 printk(KERN_ERR "SMU: Command buffer not allocated !\n");
Julia Lawall73f38fe2008-06-24 04:14:52 +1000489 ret = -EINVAL;
490 goto fail_np;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 }
492
493 smu = alloc_bootmem(sizeof(struct smu_device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
495 spin_lock_init(&smu->lock);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700496 INIT_LIST_HEAD(&smu->cmd_list);
497 INIT_LIST_HEAD(&smu->cmd_i2c_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 smu->of_node = np;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700499 smu->db_irq = NO_IRQ;
500 smu->msg_irq = NO_IRQ;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700501
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 /* smu_cmdbuf_abs is in the low 2G of RAM, can be converted to a
503 * 32 bits value safely
504 */
505 smu->cmd_buf_abs = (u32)smu_cmdbuf_abs;
506 smu->cmd_buf = (struct smu_cmd_buf *)abs_to_virt(smu_cmdbuf_abs);
507
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700508 smu->db_node = of_find_node_by_name(NULL, "smu-doorbell");
509 if (smu->db_node == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n");
Julia Lawall73f38fe2008-06-24 04:14:52 +1000511 ret = -ENXIO;
512 goto fail_bootmem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 }
Stephen Rothwell01b27262007-04-27 13:41:15 +1000514 data = of_get_property(smu->db_node, "reg", NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 if (data == NULL) {
516 printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n");
Julia Lawall73f38fe2008-06-24 04:14:52 +1000517 ret = -ENXIO;
518 goto fail_db_node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 }
520
521 /* Current setup has one doorbell GPIO that does both doorbell
522 * and ack. GPIOs are at 0x50, best would be to find that out
523 * in the device-tree though.
524 */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700525 smu->doorbell = *data;
526 if (smu->doorbell < 0x50)
527 smu->doorbell += 0x50;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700528
529 /* Now look for the smu-interrupt GPIO */
530 do {
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700531 smu->msg_node = of_find_node_by_name(NULL, "smu-interrupt");
532 if (smu->msg_node == NULL)
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700533 break;
Stephen Rothwell01b27262007-04-27 13:41:15 +1000534 data = of_get_property(smu->msg_node, "reg", NULL);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700535 if (data == NULL) {
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700536 of_node_put(smu->msg_node);
537 smu->msg_node = NULL;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700538 break;
539 }
540 smu->msg = *data;
541 if (smu->msg < 0x50)
542 smu->msg += 0x50;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700543 } while(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
545 /* Doorbell buffer is currently hard-coded, I didn't find a proper
546 * device-tree entry giving the address. Best would probably to use
547 * an offset for K2 base though, but let's do it that way for now.
548 */
549 smu->db_buf = ioremap(0x8000860c, 0x1000);
550 if (smu->db_buf == NULL) {
551 printk(KERN_ERR "SMU: Can't map doorbell buffer pointer !\n");
Julia Lawall73f38fe2008-06-24 04:14:52 +1000552 ret = -ENXIO;
553 goto fail_msg_node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 }
555
Benjamin Herrenschmidt592a6072008-02-07 14:29:43 +1100556 /* U3 has an issue with NAP mode when issuing SMU commands */
557 smu->broken_nap = pmac_get_uninorth_variant() < 4;
558 if (smu->broken_nap)
559 printk(KERN_INFO "SMU: using NAP mode workaround\n");
560
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 sys_ctrler = SYS_CTRLER_SMU;
562 return 0;
563
Julia Lawall73f38fe2008-06-24 04:14:52 +1000564fail_msg_node:
565 if (smu->msg_node)
566 of_node_put(smu->msg_node);
567fail_db_node:
568 of_node_put(smu->db_node);
569fail_bootmem:
570 free_bootmem((unsigned long)smu, sizeof(struct smu_device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 smu = NULL;
Julia Lawall73f38fe2008-06-24 04:14:52 +1000572fail_np:
573 of_node_put(np);
574 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575}
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700576
577
578static int smu_late_init(void)
579{
580 if (!smu)
581 return 0;
582
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100583 init_timer(&smu->i2c_timer);
584 smu->i2c_timer.function = smu_i2c_retry;
585 smu->i2c_timer.data = (unsigned long)smu;
586
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700587 if (smu->db_node) {
588 smu->db_irq = irq_of_parse_and_map(smu->db_node, 0);
589 if (smu->db_irq == NO_IRQ)
590 printk(KERN_ERR "smu: failed to map irq for node %s\n",
591 smu->db_node->full_name);
592 }
593 if (smu->msg_node) {
594 smu->msg_irq = irq_of_parse_and_map(smu->msg_node, 0);
595 if (smu->msg_irq == NO_IRQ)
596 printk(KERN_ERR "smu: failed to map irq for node %s\n",
597 smu->msg_node->full_name);
598 }
599
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700600 /*
601 * Try to request the interrupts
602 */
603
604 if (smu->db_irq != NO_IRQ) {
605 if (request_irq(smu->db_irq, smu_db_intr,
Thomas Gleixnerdace1452006-07-01 19:29:38 -0700606 IRQF_SHARED, "SMU doorbell", smu) < 0) {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700607 printk(KERN_WARNING "SMU: can't "
608 "request interrupt %d\n",
609 smu->db_irq);
610 smu->db_irq = NO_IRQ;
611 }
612 }
613
614 if (smu->msg_irq != NO_IRQ) {
615 if (request_irq(smu->msg_irq, smu_msg_intr,
Thomas Gleixnerdace1452006-07-01 19:29:38 -0700616 IRQF_SHARED, "SMU message", smu) < 0) {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700617 printk(KERN_WARNING "SMU: can't "
618 "request interrupt %d\n",
619 smu->msg_irq);
620 smu->msg_irq = NO_IRQ;
621 }
622 }
623
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700624 smu_irq_inited = 1;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700625 return 0;
626}
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100627/* This has to be before arch_initcall as the low i2c stuff relies on the
628 * above having been done before we reach arch_initcalls
629 */
630core_initcall(smu_late_init);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700631
632/*
633 * sysfs visibility
634 */
635
David Howellsc4028952006-11-22 14:57:56 +0000636static void smu_expose_childs(struct work_struct *unused)
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700637{
Benjamin Herrenschmidta28d3af2006-01-07 11:35:26 +1100638 struct device_node *np;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700639
Benjamin Herrenschmidta28d3af2006-01-07 11:35:26 +1100640 for (np = NULL; (np = of_get_next_child(smu->of_node, np)) != NULL;)
Stephen Rothwell55b61fe2007-05-03 17:26:52 +1000641 if (of_device_is_compatible(np, "smu-sensors"))
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100642 of_platform_device_create(np, "smu-sensors",
643 &smu->of_dev->dev);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700644}
645
David Howellsc4028952006-11-22 14:57:56 +0000646static DECLARE_WORK(smu_expose_childs_work, smu_expose_childs);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700647
Grant Likely2dc11582010-08-06 09:25:50 -0600648static int smu_platform_probe(struct platform_device* dev,
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700649 const struct of_device_id *match)
650{
651 if (!smu)
652 return -ENODEV;
653 smu->of_dev = dev;
654
655 /*
656 * Ok, we are matched, now expose all i2c busses. We have to defer
657 * that unfortunately or it would deadlock inside the device model
658 */
659 schedule_work(&smu_expose_childs_work);
660
661 return 0;
662}
663
Márton Németh46759a72010-01-10 01:43:14 +0000664static const struct of_device_id smu_platform_match[] =
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700665{
666 {
667 .type = "smu",
668 },
669 {},
670};
671
672static struct of_platform_driver smu_of_platform_driver =
673{
Grant Likely40182942010-04-13 16:13:02 -0700674 .driver = {
675 .name = "smu",
676 .owner = THIS_MODULE,
677 .of_match_table = smu_platform_match,
678 },
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700679 .probe = smu_platform_probe,
680};
681
682static int __init smu_init_sysfs(void)
683{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700684 /*
685 * Due to sysfs bogosity, a sysdev is not a real device, so
686 * we should in fact create both if we want sysdev semantics
687 * for power management.
688 * For now, we don't power manage machines with an SMU chip,
689 * I'm a bit too far from figuring out how that works with those
690 * new chipsets, but that will come back and bite us
691 */
Benjamin Herrenschmidt7eebde72006-11-11 17:24:59 +1100692 of_register_platform_driver(&smu_of_platform_driver);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700693 return 0;
694}
695
696device_initcall(smu_init_sysfs);
697
Grant Likely2dc11582010-08-06 09:25:50 -0600698struct platform_device *smu_get_ofdev(void)
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700699{
700 if (!smu)
701 return NULL;
702 return smu->of_dev;
703}
704
705EXPORT_SYMBOL_GPL(smu_get_ofdev);
706
707/*
708 * i2c interface
709 */
710
711static void smu_i2c_complete_command(struct smu_i2c_cmd *cmd, int fail)
712{
713 void (*done)(struct smu_i2c_cmd *cmd, void *misc) = cmd->done;
714 void *misc = cmd->misc;
715 unsigned long flags;
716
717 /* Check for read case */
718 if (!fail && cmd->read) {
719 if (cmd->pdata[0] < 1)
720 fail = 1;
721 else
722 memcpy(cmd->info.data, &cmd->pdata[1],
723 cmd->info.datalen);
724 }
725
726 DPRINTK("SMU: completing, success: %d\n", !fail);
727
728 /* Update status and mark no pending i2c command with lock
729 * held so nobody comes in while we dequeue an eventual
730 * pending next i2c command
731 */
732 spin_lock_irqsave(&smu->lock, flags);
733 smu->cmd_i2c_cur = NULL;
734 wmb();
735 cmd->status = fail ? -EIO : 0;
736
737 /* Is there another i2c command waiting ? */
738 if (!list_empty(&smu->cmd_i2c_list)) {
739 struct smu_i2c_cmd *newcmd;
740
741 /* Fetch it, new current, remove from list */
742 newcmd = list_entry(smu->cmd_i2c_list.next,
743 struct smu_i2c_cmd, link);
744 smu->cmd_i2c_cur = newcmd;
745 list_del(&cmd->link);
746
747 /* Queue with low level smu */
748 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
749 if (smu->cmd_cur == NULL)
750 smu_start_cmd();
751 }
752 spin_unlock_irqrestore(&smu->lock, flags);
753
754 /* Call command completion handler if any */
755 if (done)
756 done(cmd, misc);
757
758}
759
760
761static void smu_i2c_retry(unsigned long data)
762{
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100763 struct smu_i2c_cmd *cmd = smu->cmd_i2c_cur;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700764
765 DPRINTK("SMU: i2c failure, requeuing...\n");
766
767 /* requeue command simply by resetting reply_len */
768 cmd->pdata[0] = 0xff;
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100769 cmd->scmd.reply_len = sizeof(cmd->pdata);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700770 smu_queue_cmd(&cmd->scmd);
771}
772
773
774static void smu_i2c_low_completion(struct smu_cmd *scmd, void *misc)
775{
776 struct smu_i2c_cmd *cmd = misc;
777 int fail = 0;
778
779 DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n",
780 cmd->stage, scmd->status, cmd->pdata[0], scmd->reply_len);
781
782 /* Check for possible status */
783 if (scmd->status < 0)
784 fail = 1;
785 else if (cmd->read) {
786 if (cmd->stage == 0)
787 fail = cmd->pdata[0] != 0;
788 else
789 fail = cmd->pdata[0] >= 0x80;
790 } else {
791 fail = cmd->pdata[0] != 0;
792 }
793
794 /* Handle failures by requeuing command, after 5ms interval
795 */
796 if (fail && --cmd->retries > 0) {
797 DPRINTK("SMU: i2c failure, starting timer...\n");
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100798 BUG_ON(cmd != smu->cmd_i2c_cur);
Benjamin Herrenschmidtf6207532006-07-10 04:44:44 -0700799 if (!smu_irq_inited) {
800 mdelay(5);
801 smu_i2c_retry(0);
802 return;
803 }
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100804 mod_timer(&smu->i2c_timer, jiffies + msecs_to_jiffies(5));
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700805 return;
806 }
807
808 /* If failure or stage 1, command is complete */
809 if (fail || cmd->stage != 0) {
810 smu_i2c_complete_command(cmd, fail);
811 return;
812 }
813
814 DPRINTK("SMU: going to stage 1\n");
815
816 /* Ok, initial command complete, now poll status */
817 scmd->reply_buf = cmd->pdata;
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100818 scmd->reply_len = sizeof(cmd->pdata);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700819 scmd->data_buf = cmd->pdata;
820 scmd->data_len = 1;
821 cmd->pdata[0] = 0;
822 cmd->stage = 1;
823 cmd->retries = 20;
824 smu_queue_cmd(scmd);
825}
826
827
828int smu_queue_i2c(struct smu_i2c_cmd *cmd)
829{
830 unsigned long flags;
831
832 if (smu == NULL)
833 return -ENODEV;
834
835 /* Fill most fields of scmd */
836 cmd->scmd.cmd = SMU_CMD_I2C_COMMAND;
837 cmd->scmd.done = smu_i2c_low_completion;
838 cmd->scmd.misc = cmd;
839 cmd->scmd.reply_buf = cmd->pdata;
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100840 cmd->scmd.reply_len = sizeof(cmd->pdata);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700841 cmd->scmd.data_buf = (u8 *)(char *)&cmd->info;
842 cmd->scmd.status = 1;
843 cmd->stage = 0;
844 cmd->pdata[0] = 0xff;
845 cmd->retries = 20;
846 cmd->status = 1;
847
848 /* Check transfer type, sanitize some "info" fields
849 * based on transfer type and do more checking
850 */
851 cmd->info.caddr = cmd->info.devaddr;
852 cmd->read = cmd->info.devaddr & 0x01;
853 switch(cmd->info.type) {
854 case SMU_I2C_TRANSFER_SIMPLE:
855 memset(&cmd->info.sublen, 0, 4);
856 break;
857 case SMU_I2C_TRANSFER_COMBINED:
858 cmd->info.devaddr &= 0xfe;
859 case SMU_I2C_TRANSFER_STDSUB:
860 if (cmd->info.sublen > 3)
861 return -EINVAL;
862 break;
863 default:
864 return -EINVAL;
865 }
866
867 /* Finish setting up command based on transfer direction
868 */
869 if (cmd->read) {
870 if (cmd->info.datalen > SMU_I2C_READ_MAX)
871 return -EINVAL;
872 memset(cmd->info.data, 0xff, cmd->info.datalen);
873 cmd->scmd.data_len = 9;
874 } else {
875 if (cmd->info.datalen > SMU_I2C_WRITE_MAX)
876 return -EINVAL;
877 cmd->scmd.data_len = 9 + cmd->info.datalen;
878 }
879
880 DPRINTK("SMU: i2c enqueuing command\n");
881 DPRINTK("SMU: %s, len=%d bus=%x addr=%x sub0=%x type=%x\n",
882 cmd->read ? "read" : "write", cmd->info.datalen,
883 cmd->info.bus, cmd->info.caddr,
884 cmd->info.subaddr[0], cmd->info.type);
885
886
887 /* Enqueue command in i2c list, and if empty, enqueue also in
888 * main command list
889 */
890 spin_lock_irqsave(&smu->lock, flags);
891 if (smu->cmd_i2c_cur == NULL) {
892 smu->cmd_i2c_cur = cmd;
893 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
894 if (smu->cmd_cur == NULL)
895 smu_start_cmd();
896 } else
897 list_add_tail(&cmd->link, &smu->cmd_i2c_list);
898 spin_unlock_irqrestore(&smu->lock, flags);
899
900 return 0;
901}
902
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100903/*
904 * Handling of "partitions"
905 */
906
907static int smu_read_datablock(u8 *dest, unsigned int addr, unsigned int len)
908{
Peter Zijlstra6e9a4732006-09-30 23:28:10 -0700909 DECLARE_COMPLETION_ONSTACK(comp);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100910 unsigned int chunk;
911 struct smu_cmd cmd;
912 int rc;
913 u8 params[8];
914
915 /* We currently use a chunk size of 0xe. We could check the
916 * SMU firmware version and use bigger sizes though
917 */
918 chunk = 0xe;
919
920 while (len) {
921 unsigned int clen = min(len, chunk);
922
923 cmd.cmd = SMU_CMD_MISC_ee_COMMAND;
924 cmd.data_len = 7;
925 cmd.data_buf = params;
926 cmd.reply_len = chunk;
927 cmd.reply_buf = dest;
928 cmd.done = smu_done_complete;
929 cmd.misc = &comp;
930 params[0] = SMU_CMD_MISC_ee_GET_DATABLOCK_REC;
931 params[1] = 0x4;
932 *((u32 *)&params[2]) = addr;
933 params[6] = clen;
934
935 rc = smu_queue_cmd(&cmd);
936 if (rc)
937 return rc;
938 wait_for_completion(&comp);
939 if (cmd.status != 0)
940 return rc;
941 if (cmd.reply_len != clen) {
942 printk(KERN_DEBUG "SMU: short read in "
943 "smu_read_datablock, got: %d, want: %d\n",
944 cmd.reply_len, clen);
945 return -EIO;
946 }
947 len -= clen;
948 addr += clen;
949 dest += clen;
950 }
951 return 0;
952}
953
954static struct smu_sdbp_header *smu_create_sdb_partition(int id)
955{
Peter Zijlstra6e9a4732006-09-30 23:28:10 -0700956 DECLARE_COMPLETION_ONSTACK(comp);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100957 struct smu_simple_cmd cmd;
958 unsigned int addr, len, tlen;
959 struct smu_sdbp_header *hdr;
960 struct property *prop;
961
962 /* First query the partition info */
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100963 DPRINTK("SMU: Query partition infos ... (irq=%d)\n", smu->db_irq);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100964 smu_queue_simple(&cmd, SMU_CMD_PARTITION_COMMAND, 2,
965 smu_done_complete, &comp,
966 SMU_CMD_PARTITION_LATEST, id);
967 wait_for_completion(&comp);
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100968 DPRINTK("SMU: done, status: %d, reply_len: %d\n",
969 cmd.cmd.status, cmd.cmd.reply_len);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100970
971 /* Partition doesn't exist (or other error) */
972 if (cmd.cmd.status != 0 || cmd.cmd.reply_len != 6)
973 return NULL;
974
975 /* Fetch address and length from reply */
976 addr = *((u16 *)cmd.buffer);
977 len = cmd.buffer[3] << 2;
978 /* Calucluate total length to allocate, including the 17 bytes
979 * for "sdb-partition-XX" that we append at the end of the buffer
980 */
981 tlen = sizeof(struct property) + len + 18;
982
Robert P. J. Daycd861282006-12-13 00:34:52 -0800983 prop = kzalloc(tlen, GFP_KERNEL);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100984 if (prop == NULL)
985 return NULL;
986 hdr = (struct smu_sdbp_header *)(prop + 1);
987 prop->name = ((char *)prop) + tlen - 18;
988 sprintf(prop->name, "sdb-partition-%02x", id);
989 prop->length = len;
Stephen Rothwell1a381472007-04-03 10:58:52 +1000990 prop->value = hdr;
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100991 prop->next = NULL;
992
993 /* Read the datablock */
994 if (smu_read_datablock((u8 *)hdr, addr, len)) {
995 printk(KERN_DEBUG "SMU: datablock read failed while reading "
996 "partition %02x !\n", id);
997 goto failure;
998 }
999
1000 /* Got it, check a few things and create the property */
1001 if (hdr->id != id) {
1002 printk(KERN_DEBUG "SMU: Reading partition %02x and got "
1003 "%02x !\n", id, hdr->id);
1004 goto failure;
1005 }
1006 if (prom_add_property(smu->of_node, prop)) {
1007 printk(KERN_DEBUG "SMU: Failed creating sdb-partition-%02x "
1008 "property !\n", id);
1009 goto failure;
1010 }
1011
1012 return hdr;
1013 failure:
1014 kfree(prop);
1015 return NULL;
1016}
1017
1018/* Note: Only allowed to return error code in pointers (using ERR_PTR)
1019 * when interruptible is 1
1020 */
Jeremy Kerr018a3d12006-07-12 15:40:29 +10001021const struct smu_sdbp_header *__smu_get_sdb_partition(int id,
1022 unsigned int *size, int interruptible)
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +11001023{
1024 char pname[32];
Jeremy Kerr018a3d12006-07-12 15:40:29 +10001025 const struct smu_sdbp_header *part;
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +11001026
1027 if (!smu)
1028 return NULL;
1029
1030 sprintf(pname, "sdb-partition-%02x", id);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001031
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +11001032 DPRINTK("smu_get_sdb_partition(%02x)\n", id);
1033
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001034 if (interruptible) {
1035 int rc;
Ingo Molnar14cc3e22006-03-26 01:37:14 -08001036 rc = mutex_lock_interruptible(&smu_part_access);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001037 if (rc)
1038 return ERR_PTR(rc);
1039 } else
Ingo Molnar14cc3e22006-03-26 01:37:14 -08001040 mutex_lock(&smu_part_access);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001041
Stephen Rothwell01b27262007-04-27 13:41:15 +10001042 part = of_get_property(smu->of_node, pname, size);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001043 if (part == NULL) {
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +11001044 DPRINTK("trying to extract from SMU ...\n");
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001045 part = smu_create_sdb_partition(id);
1046 if (part != NULL && size)
1047 *size = part->len << 2;
1048 }
Ingo Molnar14cc3e22006-03-26 01:37:14 -08001049 mutex_unlock(&smu_part_access);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001050 return part;
1051}
1052
Jeremy Kerr018a3d12006-07-12 15:40:29 +10001053const struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size)
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001054{
1055 return __smu_get_sdb_partition(id, size, 0);
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +11001056}
1057EXPORT_SYMBOL(smu_get_sdb_partition);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001058
1059
1060/*
1061 * Userland driver interface
1062 */
1063
1064
1065static LIST_HEAD(smu_clist);
1066static DEFINE_SPINLOCK(smu_clist_lock);
1067
1068enum smu_file_mode {
1069 smu_file_commands,
1070 smu_file_events,
1071 smu_file_closing
1072};
1073
1074struct smu_private
1075{
1076 struct list_head list;
1077 enum smu_file_mode mode;
1078 int busy;
1079 struct smu_cmd cmd;
1080 spinlock_t lock;
1081 wait_queue_head_t wait;
1082 u8 buffer[SMU_MAX_DATA];
1083};
1084
1085
1086static int smu_open(struct inode *inode, struct file *file)
1087{
1088 struct smu_private *pp;
1089 unsigned long flags;
1090
Yoann Padioleaudd00cc42007-07-19 01:49:03 -07001091 pp = kzalloc(sizeof(struct smu_private), GFP_KERNEL);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001092 if (pp == 0)
1093 return -ENOMEM;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001094 spin_lock_init(&pp->lock);
1095 pp->mode = smu_file_commands;
1096 init_waitqueue_head(&pp->wait);
1097
Arnd Bergmannd851b6e2010-06-02 14:28:52 +02001098 mutex_lock(&smu_mutex);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001099 spin_lock_irqsave(&smu_clist_lock, flags);
1100 list_add(&pp->list, &smu_clist);
1101 spin_unlock_irqrestore(&smu_clist_lock, flags);
1102 file->private_data = pp;
Arnd Bergmannd851b6e2010-06-02 14:28:52 +02001103 mutex_unlock(&smu_mutex);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001104
1105 return 0;
1106}
1107
1108
1109static void smu_user_cmd_done(struct smu_cmd *cmd, void *misc)
1110{
1111 struct smu_private *pp = misc;
1112
1113 wake_up_all(&pp->wait);
1114}
1115
1116
1117static ssize_t smu_write(struct file *file, const char __user *buf,
1118 size_t count, loff_t *ppos)
1119{
1120 struct smu_private *pp = file->private_data;
1121 unsigned long flags;
1122 struct smu_user_cmd_hdr hdr;
1123 int rc = 0;
1124
1125 if (pp->busy)
1126 return -EBUSY;
1127 else if (copy_from_user(&hdr, buf, sizeof(hdr)))
1128 return -EFAULT;
1129 else if (hdr.cmdtype == SMU_CMDTYPE_WANTS_EVENTS) {
1130 pp->mode = smu_file_events;
1131 return 0;
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001132 } else if (hdr.cmdtype == SMU_CMDTYPE_GET_PARTITION) {
Jeremy Kerr018a3d12006-07-12 15:40:29 +10001133 const struct smu_sdbp_header *part;
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001134 part = __smu_get_sdb_partition(hdr.cmd, NULL, 1);
1135 if (part == NULL)
1136 return -EINVAL;
1137 else if (IS_ERR(part))
1138 return PTR_ERR(part);
1139 return 0;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001140 } else if (hdr.cmdtype != SMU_CMDTYPE_SMU)
1141 return -EINVAL;
1142 else if (pp->mode != smu_file_commands)
1143 return -EBADFD;
1144 else if (hdr.data_len > SMU_MAX_DATA)
1145 return -EINVAL;
1146
1147 spin_lock_irqsave(&pp->lock, flags);
1148 if (pp->busy) {
1149 spin_unlock_irqrestore(&pp->lock, flags);
1150 return -EBUSY;
1151 }
1152 pp->busy = 1;
1153 pp->cmd.status = 1;
1154 spin_unlock_irqrestore(&pp->lock, flags);
1155
1156 if (copy_from_user(pp->buffer, buf + sizeof(hdr), hdr.data_len)) {
1157 pp->busy = 0;
1158 return -EFAULT;
1159 }
1160
1161 pp->cmd.cmd = hdr.cmd;
1162 pp->cmd.data_len = hdr.data_len;
1163 pp->cmd.reply_len = SMU_MAX_DATA;
1164 pp->cmd.data_buf = pp->buffer;
1165 pp->cmd.reply_buf = pp->buffer;
1166 pp->cmd.done = smu_user_cmd_done;
1167 pp->cmd.misc = pp;
1168 rc = smu_queue_cmd(&pp->cmd);
1169 if (rc < 0)
1170 return rc;
1171 return count;
1172}
1173
1174
1175static ssize_t smu_read_command(struct file *file, struct smu_private *pp,
1176 char __user *buf, size_t count)
1177{
1178 DECLARE_WAITQUEUE(wait, current);
1179 struct smu_user_reply_hdr hdr;
1180 unsigned long flags;
1181 int size, rc = 0;
1182
1183 if (!pp->busy)
1184 return 0;
1185 if (count < sizeof(struct smu_user_reply_hdr))
1186 return -EOVERFLOW;
1187 spin_lock_irqsave(&pp->lock, flags);
1188 if (pp->cmd.status == 1) {
Julia Lawall86e47542010-03-29 05:34:46 +00001189 if (file->f_flags & O_NONBLOCK) {
1190 spin_unlock_irqrestore(&pp->lock, flags);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001191 return -EAGAIN;
Julia Lawall86e47542010-03-29 05:34:46 +00001192 }
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001193 add_wait_queue(&pp->wait, &wait);
1194 for (;;) {
1195 set_current_state(TASK_INTERRUPTIBLE);
1196 rc = 0;
1197 if (pp->cmd.status != 1)
1198 break;
1199 rc = -ERESTARTSYS;
1200 if (signal_pending(current))
1201 break;
1202 spin_unlock_irqrestore(&pp->lock, flags);
1203 schedule();
1204 spin_lock_irqsave(&pp->lock, flags);
1205 }
1206 set_current_state(TASK_RUNNING);
1207 remove_wait_queue(&pp->wait, &wait);
1208 }
1209 spin_unlock_irqrestore(&pp->lock, flags);
1210 if (rc)
1211 return rc;
1212 if (pp->cmd.status != 0)
1213 pp->cmd.reply_len = 0;
1214 size = sizeof(hdr) + pp->cmd.reply_len;
1215 if (count < size)
1216 size = count;
1217 rc = size;
1218 hdr.status = pp->cmd.status;
1219 hdr.reply_len = pp->cmd.reply_len;
1220 if (copy_to_user(buf, &hdr, sizeof(hdr)))
1221 return -EFAULT;
1222 size -= sizeof(hdr);
1223 if (size && copy_to_user(buf + sizeof(hdr), pp->buffer, size))
1224 return -EFAULT;
1225 pp->busy = 0;
1226
1227 return rc;
1228}
1229
1230
1231static ssize_t smu_read_events(struct file *file, struct smu_private *pp,
1232 char __user *buf, size_t count)
1233{
1234 /* Not implemented */
1235 msleep_interruptible(1000);
1236 return 0;
1237}
1238
1239
1240static ssize_t smu_read(struct file *file, char __user *buf,
1241 size_t count, loff_t *ppos)
1242{
1243 struct smu_private *pp = file->private_data;
1244
1245 if (pp->mode == smu_file_commands)
1246 return smu_read_command(file, pp, buf, count);
1247 if (pp->mode == smu_file_events)
1248 return smu_read_events(file, pp, buf, count);
1249
1250 return -EBADFD;
1251}
1252
1253static unsigned int smu_fpoll(struct file *file, poll_table *wait)
1254{
1255 struct smu_private *pp = file->private_data;
1256 unsigned int mask = 0;
1257 unsigned long flags;
1258
1259 if (pp == 0)
1260 return 0;
1261
1262 if (pp->mode == smu_file_commands) {
1263 poll_wait(file, &pp->wait, wait);
1264
1265 spin_lock_irqsave(&pp->lock, flags);
1266 if (pp->busy && pp->cmd.status != 1)
1267 mask |= POLLIN;
1268 spin_unlock_irqrestore(&pp->lock, flags);
1269 } if (pp->mode == smu_file_events) {
1270 /* Not yet implemented */
1271 }
1272 return mask;
1273}
1274
1275static int smu_release(struct inode *inode, struct file *file)
1276{
1277 struct smu_private *pp = file->private_data;
1278 unsigned long flags;
1279 unsigned int busy;
1280
1281 if (pp == 0)
1282 return 0;
1283
1284 file->private_data = NULL;
1285
1286 /* Mark file as closing to avoid races with new request */
1287 spin_lock_irqsave(&pp->lock, flags);
1288 pp->mode = smu_file_closing;
1289 busy = pp->busy;
1290
1291 /* Wait for any pending request to complete */
1292 if (busy && pp->cmd.status == 1) {
1293 DECLARE_WAITQUEUE(wait, current);
1294
1295 add_wait_queue(&pp->wait, &wait);
1296 for (;;) {
1297 set_current_state(TASK_UNINTERRUPTIBLE);
1298 if (pp->cmd.status != 1)
1299 break;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001300 spin_unlock_irqrestore(&pp->lock, flags);
Andrew Morton94256dd2007-04-16 22:53:25 -07001301 schedule();
1302 spin_lock_irqsave(&pp->lock, flags);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001303 }
1304 set_current_state(TASK_RUNNING);
1305 remove_wait_queue(&pp->wait, &wait);
1306 }
1307 spin_unlock_irqrestore(&pp->lock, flags);
1308
1309 spin_lock_irqsave(&smu_clist_lock, flags);
1310 list_del(&pp->list);
1311 spin_unlock_irqrestore(&smu_clist_lock, flags);
1312 kfree(pp);
1313
1314 return 0;
1315}
1316
1317
Arjan van de Venfa027c22007-02-12 00:55:33 -08001318static const struct file_operations smu_device_fops = {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001319 .llseek = no_llseek,
1320 .read = smu_read,
1321 .write = smu_write,
1322 .poll = smu_fpoll,
1323 .open = smu_open,
1324 .release = smu_release,
1325};
1326
Stephen Rothwell6b67f62c2005-09-27 14:09:39 +10001327static struct miscdevice pmu_device = {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001328 MISC_DYNAMIC_MINOR, "smu", &smu_device_fops
1329};
1330
1331static int smu_device_init(void)
1332{
1333 if (!smu)
1334 return -ENODEV;
1335 if (misc_register(&pmu_device) < 0)
1336 printk(KERN_ERR "via-pmu: cannot register misc device.\n");
1337 return 0;
1338}
1339device_initcall(smu_device_init);