Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc
[linux-2.6] / arch / powerpc / platforms / iseries / mf.c
1 /*
2  * Copyright (C) 2001 Troy D. Armstrong  IBM Corporation
3  * Copyright (C) 2004-2005 Stephen Rothwell  IBM Corporation
4  *
5  * This modules exists as an interface between a Linux secondary partition
6  * running on an iSeries and the primary partition's Virtual Service
7  * Processor (VSP) object.  The VSP has final authority over powering on/off
8  * all partitions in the iSeries.  It also provides miscellaneous low-level
9  * machine facility type operations.
10  *
11  *
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU General Public License as published by
14  * the Free Software Foundation; either version 2 of the License, or
15  * (at your option) any later version.
16  *
17  * This program is distributed in the hope that it will be useful,
18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  * GNU General Public License for more details.
21  *
22  * You should have received a copy of the GNU General Public License
23  * along with this program; if not, write to the Free Software
24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
25  */
26
27 #include <linux/types.h>
28 #include <linux/errno.h>
29 #include <linux/kernel.h>
30 #include <linux/init.h>
31 #include <linux/completion.h>
32 #include <linux/delay.h>
33 #include <linux/dma-mapping.h>
34 #include <linux/bcd.h>
35 #include <linux/rtc.h>
36
37 #include <asm/time.h>
38 #include <asm/uaccess.h>
39 #include <asm/paca.h>
40 #include <asm/abs_addr.h>
41 #include <asm/firmware.h>
42 #include <asm/iseries/mf.h>
43 #include <asm/iseries/hv_lp_config.h>
44 #include <asm/iseries/hv_lp_event.h>
45 #include <asm/iseries/it_lp_queue.h>
46
47 #include "setup.h"
48
49 static int mf_initialized;
50
51 /*
52  * This is the structure layout for the Machine Facilites LPAR event
53  * flows.
54  */
55 struct vsp_cmd_data {
56         u64 token;
57         u16 cmd;
58         HvLpIndex lp_index;
59         u8 result_code;
60         u32 reserved;
61         union {
62                 u64 state;      /* GetStateOut */
63                 u64 ipl_type;   /* GetIplTypeOut, Function02SelectIplTypeIn */
64                 u64 ipl_mode;   /* GetIplModeOut, Function02SelectIplModeIn */
65                 u64 page[4];    /* GetSrcHistoryIn */
66                 u64 flag;       /* GetAutoIplWhenPrimaryIplsOut,
67                                    SetAutoIplWhenPrimaryIplsIn,
68                                    WhiteButtonPowerOffIn,
69                                    Function08FastPowerOffIn,
70                                    IsSpcnRackPowerIncompleteOut */
71                 struct {
72                         u64 token;
73                         u64 address_type;
74                         u64 side;
75                         u32 length;
76                         u32 offset;
77                 } kern;         /* SetKernelImageIn, GetKernelImageIn,
78                                    SetKernelCmdLineIn, GetKernelCmdLineIn */
79                 u32 length_out; /* GetKernelImageOut, GetKernelCmdLineOut */
80                 u8 reserved[80];
81         } sub_data;
82 };
83
84 struct vsp_rsp_data {
85         struct completion com;
86         struct vsp_cmd_data *response;
87 };
88
89 struct alloc_data {
90         u16 size;
91         u16 type;
92         u32 count;
93         u16 reserved1;
94         u8 reserved2;
95         HvLpIndex target_lp;
96 };
97
98 struct ce_msg_data;
99
100 typedef void (*ce_msg_comp_hdlr)(void *token, struct ce_msg_data *vsp_cmd_rsp);
101
102 struct ce_msg_comp_data {
103         ce_msg_comp_hdlr handler;
104         void *token;
105 };
106
107 struct ce_msg_data {
108         u8 ce_msg[12];
109         char reserved[4];
110         struct ce_msg_comp_data *completion;
111 };
112
113 struct io_mf_lp_event {
114         struct HvLpEvent hp_lp_event;
115         u16 subtype_result_code;
116         u16 reserved1;
117         u32 reserved2;
118         union {
119                 struct alloc_data alloc;
120                 struct ce_msg_data ce_msg;
121                 struct vsp_cmd_data vsp_cmd;
122         } data;
123 };
124
125 #define subtype_data(a, b, c, d)        \
126                 (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
127
128 /*
129  * All outgoing event traffic is kept on a FIFO queue.  The first
130  * pointer points to the one that is outstanding, and all new
131  * requests get stuck on the end.  Also, we keep a certain number of
132  * preallocated pending events so that we can operate very early in
133  * the boot up sequence (before kmalloc is ready).
134  */
135 struct pending_event {
136         struct pending_event *next;
137         struct io_mf_lp_event event;
138         MFCompleteHandler hdlr;
139         char dma_data[72];
140         unsigned dma_data_length;
141         unsigned remote_address;
142 };
143 static spinlock_t pending_event_spinlock;
144 static struct pending_event *pending_event_head;
145 static struct pending_event *pending_event_tail;
146 static struct pending_event *pending_event_avail;
147 #define PENDING_EVENT_PREALLOC_LEN 16
148 static struct pending_event pending_event_prealloc[PENDING_EVENT_PREALLOC_LEN];
149
150 /*
151  * Put a pending event onto the available queue, so it can get reused.
152  * Attention! You must have the pending_event_spinlock before calling!
153  */
154 static void free_pending_event(struct pending_event *ev)
155 {
156         if (ev != NULL) {
157                 ev->next = pending_event_avail;
158                 pending_event_avail = ev;
159         }
160 }
161
162 /*
163  * Enqueue the outbound event onto the stack.  If the queue was
164  * empty to begin with, we must also issue it via the Hypervisor
165  * interface.  There is a section of code below that will touch
166  * the first stack pointer without the protection of the pending_event_spinlock.
167  * This is OK, because we know that nobody else will be modifying
168  * the first pointer when we do this.
169  */
170 static int signal_event(struct pending_event *ev)
171 {
172         int rc = 0;
173         unsigned long flags;
174         int go = 1;
175         struct pending_event *ev1;
176         HvLpEvent_Rc hv_rc;
177
178         /* enqueue the event */
179         if (ev != NULL) {
180                 ev->next = NULL;
181                 spin_lock_irqsave(&pending_event_spinlock, flags);
182                 if (pending_event_head == NULL)
183                         pending_event_head = ev;
184                 else {
185                         go = 0;
186                         pending_event_tail->next = ev;
187                 }
188                 pending_event_tail = ev;
189                 spin_unlock_irqrestore(&pending_event_spinlock, flags);
190         }
191
192         /* send the event */
193         while (go) {
194                 go = 0;
195
196                 /* any DMA data to send beforehand? */
197                 if (pending_event_head->dma_data_length > 0)
198                         HvCallEvent_dmaToSp(pending_event_head->dma_data,
199                                         pending_event_head->remote_address,
200                                         pending_event_head->dma_data_length,
201                                         HvLpDma_Direction_LocalToRemote);
202
203                 hv_rc = HvCallEvent_signalLpEvent(
204                                 &pending_event_head->event.hp_lp_event);
205                 if (hv_rc != HvLpEvent_Rc_Good) {
206                         printk(KERN_ERR "mf.c: HvCallEvent_signalLpEvent() "
207                                         "failed with %d\n", (int)hv_rc);
208
209                         spin_lock_irqsave(&pending_event_spinlock, flags);
210                         ev1 = pending_event_head;
211                         pending_event_head = pending_event_head->next;
212                         if (pending_event_head != NULL)
213                                 go = 1;
214                         spin_unlock_irqrestore(&pending_event_spinlock, flags);
215
216                         if (ev1 == ev)
217                                 rc = -EIO;
218                         else if (ev1->hdlr != NULL)
219                                 (*ev1->hdlr)((void *)ev1->event.hp_lp_event.xCorrelationToken, -EIO);
220
221                         spin_lock_irqsave(&pending_event_spinlock, flags);
222                         free_pending_event(ev1);
223                         spin_unlock_irqrestore(&pending_event_spinlock, flags);
224                 }
225         }
226
227         return rc;
228 }
229
230 /*
231  * Allocate a new pending_event structure, and initialize it.
232  */
233 static struct pending_event *new_pending_event(void)
234 {
235         struct pending_event *ev = NULL;
236         HvLpIndex primary_lp = HvLpConfig_getPrimaryLpIndex();
237         unsigned long flags;
238         struct HvLpEvent *hev;
239
240         spin_lock_irqsave(&pending_event_spinlock, flags);
241         if (pending_event_avail != NULL) {
242                 ev = pending_event_avail;
243                 pending_event_avail = pending_event_avail->next;
244         }
245         spin_unlock_irqrestore(&pending_event_spinlock, flags);
246         if (ev == NULL) {
247                 ev = kmalloc(sizeof(struct pending_event), GFP_ATOMIC);
248                 if (ev == NULL) {
249                         printk(KERN_ERR "mf.c: unable to kmalloc %ld bytes\n",
250                                         sizeof(struct pending_event));
251                         return NULL;
252                 }
253         }
254         memset(ev, 0, sizeof(struct pending_event));
255         hev = &ev->event.hp_lp_event;
256         hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DO_ACK | HV_LP_EVENT_INT;
257         hev->xType = HvLpEvent_Type_MachineFac;
258         hev->xSourceLp = HvLpConfig_getLpIndex();
259         hev->xTargetLp = primary_lp;
260         hev->xSizeMinus1 = sizeof(ev->event) - 1;
261         hev->xRc = HvLpEvent_Rc_Good;
262         hev->xSourceInstanceId = HvCallEvent_getSourceLpInstanceId(primary_lp,
263                         HvLpEvent_Type_MachineFac);
264         hev->xTargetInstanceId = HvCallEvent_getTargetLpInstanceId(primary_lp,
265                         HvLpEvent_Type_MachineFac);
266
267         return ev;
268 }
269
270 static int signal_vsp_instruction(struct vsp_cmd_data *vsp_cmd)
271 {
272         struct pending_event *ev = new_pending_event();
273         int rc;
274         struct vsp_rsp_data response;
275
276         if (ev == NULL)
277                 return -ENOMEM;
278
279         init_completion(&response.com);
280         response.response = vsp_cmd;
281         ev->event.hp_lp_event.xSubtype = 6;
282         ev->event.hp_lp_event.x.xSubtypeData =
283                 subtype_data('M', 'F',  'V',  'I');
284         ev->event.data.vsp_cmd.token = (u64)&response;
285         ev->event.data.vsp_cmd.cmd = vsp_cmd->cmd;
286         ev->event.data.vsp_cmd.lp_index = HvLpConfig_getLpIndex();
287         ev->event.data.vsp_cmd.result_code = 0xFF;
288         ev->event.data.vsp_cmd.reserved = 0;
289         memcpy(&(ev->event.data.vsp_cmd.sub_data),
290                         &(vsp_cmd->sub_data), sizeof(vsp_cmd->sub_data));
291         mb();
292
293         rc = signal_event(ev);
294         if (rc == 0)
295                 wait_for_completion(&response.com);
296         return rc;
297 }
298
299
300 /*
301  * Send a 12-byte CE message to the primary partition VSP object
302  */
303 static int signal_ce_msg(char *ce_msg, struct ce_msg_comp_data *completion)
304 {
305         struct pending_event *ev = new_pending_event();
306
307         if (ev == NULL)
308                 return -ENOMEM;
309
310         ev->event.hp_lp_event.xSubtype = 0;
311         ev->event.hp_lp_event.x.xSubtypeData =
312                 subtype_data('M',  'F',  'C',  'E');
313         memcpy(ev->event.data.ce_msg.ce_msg, ce_msg, 12);
314         ev->event.data.ce_msg.completion = completion;
315         return signal_event(ev);
316 }
317
318 /*
319  * Send a 12-byte CE message (with no data) to the primary partition VSP object
320  */
321 static int signal_ce_msg_simple(u8 ce_op, struct ce_msg_comp_data *completion)
322 {
323         u8 ce_msg[12];
324
325         memset(ce_msg, 0, sizeof(ce_msg));
326         ce_msg[3] = ce_op;
327         return signal_ce_msg(ce_msg, completion);
328 }
329
330 /*
331  * Send a 12-byte CE message and DMA data to the primary partition VSP object
332  */
333 static int dma_and_signal_ce_msg(char *ce_msg,
334                 struct ce_msg_comp_data *completion, void *dma_data,
335                 unsigned dma_data_length, unsigned remote_address)
336 {
337         struct pending_event *ev = new_pending_event();
338
339         if (ev == NULL)
340                 return -ENOMEM;
341
342         ev->event.hp_lp_event.xSubtype = 0;
343         ev->event.hp_lp_event.x.xSubtypeData =
344                 subtype_data('M', 'F', 'C', 'E');
345         memcpy(ev->event.data.ce_msg.ce_msg, ce_msg, 12);
346         ev->event.data.ce_msg.completion = completion;
347         memcpy(ev->dma_data, dma_data, dma_data_length);
348         ev->dma_data_length = dma_data_length;
349         ev->remote_address = remote_address;
350         return signal_event(ev);
351 }
352
353 /*
354  * Initiate a nice (hopefully) shutdown of Linux.  We simply are
355  * going to try and send the init process a SIGINT signal.  If
356  * this fails (why?), we'll simply force it off in a not-so-nice
357  * manner.
358  */
359 static int shutdown(void)
360 {
361         int rc = kill_cad_pid(SIGINT, 1);
362
363         if (rc) {
364                 printk(KERN_ALERT "mf.c: SIGINT to init failed (%d), "
365                                 "hard shutdown commencing\n", rc);
366                 mf_power_off();
367         } else
368                 printk(KERN_INFO "mf.c: init has been successfully notified "
369                                 "to proceed with shutdown\n");
370         return rc;
371 }
372
373 /*
374  * The primary partition VSP object is sending us a new
375  * event flow.  Handle it...
376  */
377 static void handle_int(struct io_mf_lp_event *event)
378 {
379         struct ce_msg_data *ce_msg_data;
380         struct ce_msg_data *pce_msg_data;
381         unsigned long flags;
382         struct pending_event *pev;
383
384         /* ack the interrupt */
385         event->hp_lp_event.xRc = HvLpEvent_Rc_Good;
386         HvCallEvent_ackLpEvent(&event->hp_lp_event);
387
388         /* process interrupt */
389         switch (event->hp_lp_event.xSubtype) {
390         case 0: /* CE message */
391                 ce_msg_data = &event->data.ce_msg;
392                 switch (ce_msg_data->ce_msg[3]) {
393                 case 0x5B:      /* power control notification */
394                         if ((ce_msg_data->ce_msg[5] & 0x20) != 0) {
395                                 printk(KERN_INFO "mf.c: Commencing partition shutdown\n");
396                                 if (shutdown() == 0)
397                                         signal_ce_msg_simple(0xDB, NULL);
398                         }
399                         break;
400                 case 0xC0:      /* get time */
401                         spin_lock_irqsave(&pending_event_spinlock, flags);
402                         pev = pending_event_head;
403                         if (pev != NULL)
404                                 pending_event_head = pending_event_head->next;
405                         spin_unlock_irqrestore(&pending_event_spinlock, flags);
406                         if (pev == NULL)
407                                 break;
408                         pce_msg_data = &pev->event.data.ce_msg;
409                         if (pce_msg_data->ce_msg[3] != 0x40)
410                                 break;
411                         if (pce_msg_data->completion != NULL) {
412                                 ce_msg_comp_hdlr handler =
413                                         pce_msg_data->completion->handler;
414                                 void *token = pce_msg_data->completion->token;
415
416                                 if (handler != NULL)
417                                         (*handler)(token, ce_msg_data);
418                         }
419                         spin_lock_irqsave(&pending_event_spinlock, flags);
420                         free_pending_event(pev);
421                         spin_unlock_irqrestore(&pending_event_spinlock, flags);
422                         /* send next waiting event */
423                         if (pending_event_head != NULL)
424                                 signal_event(NULL);
425                         break;
426                 }
427                 break;
428         case 1: /* IT sys shutdown */
429                 printk(KERN_INFO "mf.c: Commencing system shutdown\n");
430                 shutdown();
431                 break;
432         }
433 }
434
435 /*
436  * The primary partition VSP object is acknowledging the receipt
437  * of a flow we sent to them.  If there are other flows queued
438  * up, we must send another one now...
439  */
440 static void handle_ack(struct io_mf_lp_event *event)
441 {
442         unsigned long flags;
443         struct pending_event *two = NULL;
444         unsigned long free_it = 0;
445         struct ce_msg_data *ce_msg_data;
446         struct ce_msg_data *pce_msg_data;
447         struct vsp_rsp_data *rsp;
448
449         /* handle current event */
450         if (pending_event_head == NULL) {
451                 printk(KERN_ERR "mf.c: stack empty for receiving ack\n");
452                 return;
453         }
454
455         switch (event->hp_lp_event.xSubtype) {
456         case 0:     /* CE msg */
457                 ce_msg_data = &event->data.ce_msg;
458                 if (ce_msg_data->ce_msg[3] != 0x40) {
459                         free_it = 1;
460                         break;
461                 }
462                 if (ce_msg_data->ce_msg[2] == 0)
463                         break;
464                 free_it = 1;
465                 pce_msg_data = &pending_event_head->event.data.ce_msg;
466                 if (pce_msg_data->completion != NULL) {
467                         ce_msg_comp_hdlr handler =
468                                 pce_msg_data->completion->handler;
469                         void *token = pce_msg_data->completion->token;
470
471                         if (handler != NULL)
472                                 (*handler)(token, ce_msg_data);
473                 }
474                 break;
475         case 4: /* allocate */
476         case 5: /* deallocate */
477                 if (pending_event_head->hdlr != NULL)
478                         (*pending_event_head->hdlr)((void *)event->hp_lp_event.xCorrelationToken, event->data.alloc.count);
479                 free_it = 1;
480                 break;
481         case 6:
482                 free_it = 1;
483                 rsp = (struct vsp_rsp_data *)event->data.vsp_cmd.token;
484                 if (rsp == NULL) {
485                         printk(KERN_ERR "mf.c: no rsp\n");
486                         break;
487                 }
488                 if (rsp->response != NULL)
489                         memcpy(rsp->response, &event->data.vsp_cmd,
490                                         sizeof(event->data.vsp_cmd));
491                 complete(&rsp->com);
492                 break;
493         }
494
495         /* remove from queue */
496         spin_lock_irqsave(&pending_event_spinlock, flags);
497         if ((pending_event_head != NULL) && (free_it == 1)) {
498                 struct pending_event *oldHead = pending_event_head;
499
500                 pending_event_head = pending_event_head->next;
501                 two = pending_event_head;
502                 free_pending_event(oldHead);
503         }
504         spin_unlock_irqrestore(&pending_event_spinlock, flags);
505
506         /* send next waiting event */
507         if (two != NULL)
508                 signal_event(NULL);
509 }
510
511 /*
512  * This is the generic event handler we are registering with
513  * the Hypervisor.  Ensure the flows are for us, and then
514  * parse it enough to know if it is an interrupt or an
515  * acknowledge.
516  */
517 static void hv_handler(struct HvLpEvent *event)
518 {
519         if ((event != NULL) && (event->xType == HvLpEvent_Type_MachineFac)) {
520                 if (hvlpevent_is_ack(event))
521                         handle_ack((struct io_mf_lp_event *)event);
522                 else
523                         handle_int((struct io_mf_lp_event *)event);
524         } else
525                 printk(KERN_ERR "mf.c: alien event received\n");
526 }
527
528 /*
529  * Global kernel interface to allocate and seed events into the
530  * Hypervisor.
531  */
532 void mf_allocate_lp_events(HvLpIndex target_lp, HvLpEvent_Type type,
533                 unsigned size, unsigned count, MFCompleteHandler hdlr,
534                 void *user_token)
535 {
536         struct pending_event *ev = new_pending_event();
537         int rc;
538
539         if (ev == NULL) {
540                 rc = -ENOMEM;
541         } else {
542                 ev->event.hp_lp_event.xSubtype = 4;
543                 ev->event.hp_lp_event.xCorrelationToken = (u64)user_token;
544                 ev->event.hp_lp_event.x.xSubtypeData =
545                         subtype_data('M', 'F', 'M', 'A');
546                 ev->event.data.alloc.target_lp = target_lp;
547                 ev->event.data.alloc.type = type;
548                 ev->event.data.alloc.size = size;
549                 ev->event.data.alloc.count = count;
550                 ev->hdlr = hdlr;
551                 rc = signal_event(ev);
552         }
553         if ((rc != 0) && (hdlr != NULL))
554                 (*hdlr)(user_token, rc);
555 }
556 EXPORT_SYMBOL(mf_allocate_lp_events);
557
558 /*
559  * Global kernel interface to unseed and deallocate events already in
560  * Hypervisor.
561  */
562 void mf_deallocate_lp_events(HvLpIndex target_lp, HvLpEvent_Type type,
563                 unsigned count, MFCompleteHandler hdlr, void *user_token)
564 {
565         struct pending_event *ev = new_pending_event();
566         int rc;
567
568         if (ev == NULL)
569                 rc = -ENOMEM;
570         else {
571                 ev->event.hp_lp_event.xSubtype = 5;
572                 ev->event.hp_lp_event.xCorrelationToken = (u64)user_token;
573                 ev->event.hp_lp_event.x.xSubtypeData =
574                         subtype_data('M', 'F', 'M', 'D');
575                 ev->event.data.alloc.target_lp = target_lp;
576                 ev->event.data.alloc.type = type;
577                 ev->event.data.alloc.count = count;
578                 ev->hdlr = hdlr;
579                 rc = signal_event(ev);
580         }
581         if ((rc != 0) && (hdlr != NULL))
582                 (*hdlr)(user_token, rc);
583 }
584 EXPORT_SYMBOL(mf_deallocate_lp_events);
585
586 /*
587  * Global kernel interface to tell the VSP object in the primary
588  * partition to power this partition off.
589  */
590 void mf_power_off(void)
591 {
592         printk(KERN_INFO "mf.c: Down it goes...\n");
593         signal_ce_msg_simple(0x4d, NULL);
594         for (;;)
595                 ;
596 }
597
598 /*
599  * Global kernel interface to tell the VSP object in the primary
600  * partition to reboot this partition.
601  */
602 void mf_reboot(char *cmd)
603 {
604         printk(KERN_INFO "mf.c: Preparing to bounce...\n");
605         signal_ce_msg_simple(0x4e, NULL);
606         for (;;)
607                 ;
608 }
609
610 /*
611  * Display a single word SRC onto the VSP control panel.
612  */
613 void mf_display_src(u32 word)
614 {
615         u8 ce[12];
616
617         memset(ce, 0, sizeof(ce));
618         ce[3] = 0x4a;
619         ce[7] = 0x01;
620         ce[8] = word >> 24;
621         ce[9] = word >> 16;
622         ce[10] = word >> 8;
623         ce[11] = word;
624         signal_ce_msg(ce, NULL);
625 }
626
627 /*
628  * Display a single word SRC of the form "PROGXXXX" on the VSP control panel.
629  */
630 static __init void mf_display_progress_src(u16 value)
631 {
632         u8 ce[12];
633         u8 src[72];
634
635         memcpy(ce, "\x00\x00\x04\x4A\x00\x00\x00\x48\x00\x00\x00\x00", 12);
636         memcpy(src, "\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00"
637                 "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
638                 "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
639                 "\x00\x00\x00\x00PROGxxxx                        ",
640                 72);
641         src[6] = value >> 8;
642         src[7] = value & 255;
643         src[44] = "0123456789ABCDEF"[(value >> 12) & 15];
644         src[45] = "0123456789ABCDEF"[(value >> 8) & 15];
645         src[46] = "0123456789ABCDEF"[(value >> 4) & 15];
646         src[47] = "0123456789ABCDEF"[value & 15];
647         dma_and_signal_ce_msg(ce, NULL, src, sizeof(src), 9 * 64 * 1024);
648 }
649
650 /*
651  * Clear the VSP control panel.  Used to "erase" an SRC that was
652  * previously displayed.
653  */
654 static void mf_clear_src(void)
655 {
656         signal_ce_msg_simple(0x4b, NULL);
657 }
658
659 void __init mf_display_progress(u16 value)
660 {
661         if (!mf_initialized)
662                 return;
663
664         if (0xFFFF == value)
665                 mf_clear_src();
666         else
667                 mf_display_progress_src(value);
668 }
669
670 /*
671  * Initialization code here.
672  */
673 void __init mf_init(void)
674 {
675         int i;
676
677         spin_lock_init(&pending_event_spinlock);
678
679         for (i = 0; i < PENDING_EVENT_PREALLOC_LEN; i++)
680                 free_pending_event(&pending_event_prealloc[i]);
681
682         HvLpEvent_registerHandler(HvLpEvent_Type_MachineFac, &hv_handler);
683
684         /* virtual continue ack */
685         signal_ce_msg_simple(0x57, NULL);
686
687         mf_initialized = 1;
688         mb();
689
690         printk(KERN_NOTICE "mf.c: iSeries Linux LPAR Machine Facilities "
691                         "initialized\n");
692 }
693
694 struct rtc_time_data {
695         struct completion com;
696         struct ce_msg_data ce_msg;
697         int rc;
698 };
699
700 static void get_rtc_time_complete(void *token, struct ce_msg_data *ce_msg)
701 {
702         struct rtc_time_data *rtc = token;
703
704         memcpy(&rtc->ce_msg, ce_msg, sizeof(rtc->ce_msg));
705         rtc->rc = 0;
706         complete(&rtc->com);
707 }
708
709 static int mf_set_rtc(struct rtc_time *tm)
710 {
711         char ce_time[12];
712         u8 day, mon, hour, min, sec, y1, y2;
713         unsigned year;
714
715         year = 1900 + tm->tm_year;
716         y1 = year / 100;
717         y2 = year % 100;
718
719         sec = tm->tm_sec;
720         min = tm->tm_min;
721         hour = tm->tm_hour;
722         day = tm->tm_mday;
723         mon = tm->tm_mon + 1;
724
725         BIN_TO_BCD(sec);
726         BIN_TO_BCD(min);
727         BIN_TO_BCD(hour);
728         BIN_TO_BCD(mon);
729         BIN_TO_BCD(day);
730         BIN_TO_BCD(y1);
731         BIN_TO_BCD(y2);
732
733         memset(ce_time, 0, sizeof(ce_time));
734         ce_time[3] = 0x41;
735         ce_time[4] = y1;
736         ce_time[5] = y2;
737         ce_time[6] = sec;
738         ce_time[7] = min;
739         ce_time[8] = hour;
740         ce_time[10] = day;
741         ce_time[11] = mon;
742
743         return signal_ce_msg(ce_time, NULL);
744 }
745
746 static int rtc_set_tm(int rc, u8 *ce_msg, struct rtc_time *tm)
747 {
748         tm->tm_wday = 0;
749         tm->tm_yday = 0;
750         tm->tm_isdst = 0;
751         if (rc) {
752                 tm->tm_sec = 0;
753                 tm->tm_min = 0;
754                 tm->tm_hour = 0;
755                 tm->tm_mday = 15;
756                 tm->tm_mon = 5;
757                 tm->tm_year = 52;
758                 return rc;
759         }
760
761         if ((ce_msg[2] == 0xa9) ||
762             (ce_msg[2] == 0xaf)) {
763                 /* TOD clock is not set */
764                 tm->tm_sec = 1;
765                 tm->tm_min = 1;
766                 tm->tm_hour = 1;
767                 tm->tm_mday = 10;
768                 tm->tm_mon = 8;
769                 tm->tm_year = 71;
770                 mf_set_rtc(tm);
771         }
772         {
773                 u8 year = ce_msg[5];
774                 u8 sec = ce_msg[6];
775                 u8 min = ce_msg[7];
776                 u8 hour = ce_msg[8];
777                 u8 day = ce_msg[10];
778                 u8 mon = ce_msg[11];
779
780                 BCD_TO_BIN(sec);
781                 BCD_TO_BIN(min);
782                 BCD_TO_BIN(hour);
783                 BCD_TO_BIN(day);
784                 BCD_TO_BIN(mon);
785                 BCD_TO_BIN(year);
786
787                 if (year <= 69)
788                         year += 100;
789
790                 tm->tm_sec = sec;
791                 tm->tm_min = min;
792                 tm->tm_hour = hour;
793                 tm->tm_mday = day;
794                 tm->tm_mon = mon;
795                 tm->tm_year = year;
796         }
797
798         return 0;
799 }
800
801 static int mf_get_rtc(struct rtc_time *tm)
802 {
803         struct ce_msg_comp_data ce_complete;
804         struct rtc_time_data rtc_data;
805         int rc;
806
807         memset(&ce_complete, 0, sizeof(ce_complete));
808         memset(&rtc_data, 0, sizeof(rtc_data));
809         init_completion(&rtc_data.com);
810         ce_complete.handler = &get_rtc_time_complete;
811         ce_complete.token = &rtc_data;
812         rc = signal_ce_msg_simple(0x40, &ce_complete);
813         if (rc)
814                 return rc;
815         wait_for_completion(&rtc_data.com);
816         return rtc_set_tm(rtc_data.rc, rtc_data.ce_msg.ce_msg, tm);
817 }
818
819 struct boot_rtc_time_data {
820         int busy;
821         struct ce_msg_data ce_msg;
822         int rc;
823 };
824
825 static void get_boot_rtc_time_complete(void *token, struct ce_msg_data *ce_msg)
826 {
827         struct boot_rtc_time_data *rtc = token;
828
829         memcpy(&rtc->ce_msg, ce_msg, sizeof(rtc->ce_msg));
830         rtc->rc = 0;
831         rtc->busy = 0;
832 }
833
834 static int mf_get_boot_rtc(struct rtc_time *tm)
835 {
836         struct ce_msg_comp_data ce_complete;
837         struct boot_rtc_time_data rtc_data;
838         int rc;
839
840         memset(&ce_complete, 0, sizeof(ce_complete));
841         memset(&rtc_data, 0, sizeof(rtc_data));
842         rtc_data.busy = 1;
843         ce_complete.handler = &get_boot_rtc_time_complete;
844         ce_complete.token = &rtc_data;
845         rc = signal_ce_msg_simple(0x40, &ce_complete);
846         if (rc)
847                 return rc;
848         /* We need to poll here as we are not yet taking interrupts */
849         while (rtc_data.busy) {
850                 if (hvlpevent_is_pending())
851                         process_hvlpevents();
852         }
853         return rtc_set_tm(rtc_data.rc, rtc_data.ce_msg.ce_msg, tm);
854 }
855
856 #ifdef CONFIG_PROC_FS
857
858 static int proc_mf_dump_cmdline(char *page, char **start, off_t off,
859                 int count, int *eof, void *data)
860 {
861         int len;
862         char *p;
863         struct vsp_cmd_data vsp_cmd;
864         int rc;
865         dma_addr_t dma_addr;
866
867         /* The HV appears to return no more than 256 bytes of command line */
868         if (off >= 256)
869                 return 0;
870         if ((off + count) > 256)
871                 count = 256 - off;
872
873         dma_addr = iseries_hv_map(page, off + count, DMA_FROM_DEVICE);
874         if (dma_mapping_error(dma_addr))
875                 return -ENOMEM;
876         memset(page, 0, off + count);
877         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
878         vsp_cmd.cmd = 33;
879         vsp_cmd.sub_data.kern.token = dma_addr;
880         vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
881         vsp_cmd.sub_data.kern.side = (u64)data;
882         vsp_cmd.sub_data.kern.length = off + count;
883         mb();
884         rc = signal_vsp_instruction(&vsp_cmd);
885         iseries_hv_unmap(dma_addr, off + count, DMA_FROM_DEVICE);
886         if (rc)
887                 return rc;
888         if (vsp_cmd.result_code != 0)
889                 return -ENOMEM;
890         p = page;
891         len = 0;
892         while (len < (off + count)) {
893                 if ((*p == '\0') || (*p == '\n')) {
894                         if (*p == '\0')
895                                 *p = '\n';
896                         p++;
897                         len++;
898                         *eof = 1;
899                         break;
900                 }
901                 p++;
902                 len++;
903         }
904
905         if (len < off) {
906                 *eof = 1;
907                 len = 0;
908         }
909         return len;
910 }
911
912 #if 0
913 static int mf_getVmlinuxChunk(char *buffer, int *size, int offset, u64 side)
914 {
915         struct vsp_cmd_data vsp_cmd;
916         int rc;
917         int len = *size;
918         dma_addr_t dma_addr;
919
920         dma_addr = iseries_hv_map(buffer, len, DMA_FROM_DEVICE);
921         memset(buffer, 0, len);
922         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
923         vsp_cmd.cmd = 32;
924         vsp_cmd.sub_data.kern.token = dma_addr;
925         vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
926         vsp_cmd.sub_data.kern.side = side;
927         vsp_cmd.sub_data.kern.offset = offset;
928         vsp_cmd.sub_data.kern.length = len;
929         mb();
930         rc = signal_vsp_instruction(&vsp_cmd);
931         if (rc == 0) {
932                 if (vsp_cmd.result_code == 0)
933                         *size = vsp_cmd.sub_data.length_out;
934                 else
935                         rc = -ENOMEM;
936         }
937
938         iseries_hv_unmap(dma_addr, len, DMA_FROM_DEVICE);
939
940         return rc;
941 }
942
943 static int proc_mf_dump_vmlinux(char *page, char **start, off_t off,
944                 int count, int *eof, void *data)
945 {
946         int sizeToGet = count;
947
948         if (!capable(CAP_SYS_ADMIN))
949                 return -EACCES;
950
951         if (mf_getVmlinuxChunk(page, &sizeToGet, off, (u64)data) == 0) {
952                 if (sizeToGet != 0) {
953                         *start = page + off;
954                         return sizeToGet;
955                 }
956                 *eof = 1;
957                 return 0;
958         }
959         *eof = 1;
960         return 0;
961 }
962 #endif
963
964 static int proc_mf_dump_side(char *page, char **start, off_t off,
965                 int count, int *eof, void *data)
966 {
967         int len;
968         char mf_current_side = ' ';
969         struct vsp_cmd_data vsp_cmd;
970
971         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
972         vsp_cmd.cmd = 2;
973         vsp_cmd.sub_data.ipl_type = 0;
974         mb();
975
976         if (signal_vsp_instruction(&vsp_cmd) == 0) {
977                 if (vsp_cmd.result_code == 0) {
978                         switch (vsp_cmd.sub_data.ipl_type) {
979                         case 0: mf_current_side = 'A';
980                                 break;
981                         case 1: mf_current_side = 'B';
982                                 break;
983                         case 2: mf_current_side = 'C';
984                                 break;
985                         default:        mf_current_side = 'D';
986                                 break;
987                         }
988                 }
989         }
990
991         len = sprintf(page, "%c\n", mf_current_side);
992
993         if (len <= (off + count))
994                 *eof = 1;
995         *start = page + off;
996         len -= off;
997         if (len > count)
998                 len = count;
999         if (len < 0)
1000                 len = 0;
1001         return len;
1002 }
1003
1004 static int proc_mf_change_side(struct file *file, const char __user *buffer,
1005                 unsigned long count, void *data)
1006 {
1007         char side;
1008         u64 newSide;
1009         struct vsp_cmd_data vsp_cmd;
1010
1011         if (!capable(CAP_SYS_ADMIN))
1012                 return -EACCES;
1013
1014         if (count == 0)
1015                 return 0;
1016
1017         if (get_user(side, buffer))
1018                 return -EFAULT;
1019
1020         switch (side) {
1021         case 'A':       newSide = 0;
1022                         break;
1023         case 'B':       newSide = 1;
1024                         break;
1025         case 'C':       newSide = 2;
1026                         break;
1027         case 'D':       newSide = 3;
1028                         break;
1029         default:
1030                 printk(KERN_ERR "mf_proc.c: proc_mf_change_side: invalid side\n");
1031                 return -EINVAL;
1032         }
1033
1034         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
1035         vsp_cmd.sub_data.ipl_type = newSide;
1036         vsp_cmd.cmd = 10;
1037
1038         (void)signal_vsp_instruction(&vsp_cmd);
1039
1040         return count;
1041 }
1042
1043 #if 0
1044 static void mf_getSrcHistory(char *buffer, int size)
1045 {
1046         struct IplTypeReturnStuff return_stuff;
1047         struct pending_event *ev = new_pending_event();
1048         int rc = 0;
1049         char *pages[4];
1050
1051         pages[0] = kmalloc(4096, GFP_ATOMIC);
1052         pages[1] = kmalloc(4096, GFP_ATOMIC);
1053         pages[2] = kmalloc(4096, GFP_ATOMIC);
1054         pages[3] = kmalloc(4096, GFP_ATOMIC);
1055         if ((ev == NULL) || (pages[0] == NULL) || (pages[1] == NULL)
1056                          || (pages[2] == NULL) || (pages[3] == NULL))
1057                 return -ENOMEM;
1058
1059         return_stuff.xType = 0;
1060         return_stuff.xRc = 0;
1061         return_stuff.xDone = 0;
1062         ev->event.hp_lp_event.xSubtype = 6;
1063         ev->event.hp_lp_event.x.xSubtypeData =
1064                 subtype_data('M', 'F', 'V', 'I');
1065         ev->event.data.vsp_cmd.xEvent = &return_stuff;
1066         ev->event.data.vsp_cmd.cmd = 4;
1067         ev->event.data.vsp_cmd.lp_index = HvLpConfig_getLpIndex();
1068         ev->event.data.vsp_cmd.result_code = 0xFF;
1069         ev->event.data.vsp_cmd.reserved = 0;
1070         ev->event.data.vsp_cmd.sub_data.page[0] = iseries_hv_addr(pages[0]);
1071         ev->event.data.vsp_cmd.sub_data.page[1] = iseries_hv_addr(pages[1]);
1072         ev->event.data.vsp_cmd.sub_data.page[2] = iseries_hv_addr(pages[2]);
1073         ev->event.data.vsp_cmd.sub_data.page[3] = iseries_hv_addr(pages[3]);
1074         mb();
1075         if (signal_event(ev) != 0)
1076                 return;
1077
1078         while (return_stuff.xDone != 1)
1079                 udelay(10);
1080         if (return_stuff.xRc == 0)
1081                 memcpy(buffer, pages[0], size);
1082         kfree(pages[0]);
1083         kfree(pages[1]);
1084         kfree(pages[2]);
1085         kfree(pages[3]);
1086 }
1087 #endif
1088
1089 static int proc_mf_dump_src(char *page, char **start, off_t off,
1090                 int count, int *eof, void *data)
1091 {
1092 #if 0
1093         int len;
1094
1095         mf_getSrcHistory(page, count);
1096         len = count;
1097         len -= off;
1098         if (len < count) {
1099                 *eof = 1;
1100                 if (len <= 0)
1101                         return 0;
1102         } else
1103                 len = count;
1104         *start = page + off;
1105         return len;
1106 #else
1107         return 0;
1108 #endif
1109 }
1110
1111 static int proc_mf_change_src(struct file *file, const char __user *buffer,
1112                 unsigned long count, void *data)
1113 {
1114         char stkbuf[10];
1115
1116         if (!capable(CAP_SYS_ADMIN))
1117                 return -EACCES;
1118
1119         if ((count < 4) && (count != 1)) {
1120                 printk(KERN_ERR "mf_proc: invalid src\n");
1121                 return -EINVAL;
1122         }
1123
1124         if (count > (sizeof(stkbuf) - 1))
1125                 count = sizeof(stkbuf) - 1;
1126         if (copy_from_user(stkbuf, buffer, count))
1127                 return -EFAULT;
1128
1129         if ((count == 1) && (*stkbuf == '\0'))
1130                 mf_clear_src();
1131         else
1132                 mf_display_src(*(u32 *)stkbuf);
1133
1134         return count;
1135 }
1136
1137 static int proc_mf_change_cmdline(struct file *file, const char __user *buffer,
1138                 unsigned long count, void *data)
1139 {
1140         struct vsp_cmd_data vsp_cmd;
1141         dma_addr_t dma_addr;
1142         char *page;
1143         int ret = -EACCES;
1144
1145         if (!capable(CAP_SYS_ADMIN))
1146                 goto out;
1147
1148         dma_addr = 0;
1149         page = iseries_hv_alloc(count, &dma_addr, GFP_ATOMIC);
1150         ret = -ENOMEM;
1151         if (page == NULL)
1152                 goto out;
1153
1154         ret = -EFAULT;
1155         if (copy_from_user(page, buffer, count))
1156                 goto out_free;
1157
1158         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
1159         vsp_cmd.cmd = 31;
1160         vsp_cmd.sub_data.kern.token = dma_addr;
1161         vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
1162         vsp_cmd.sub_data.kern.side = (u64)data;
1163         vsp_cmd.sub_data.kern.length = count;
1164         mb();
1165         (void)signal_vsp_instruction(&vsp_cmd);
1166         ret = count;
1167
1168 out_free:
1169         iseries_hv_free(count, page, dma_addr);
1170 out:
1171         return ret;
1172 }
1173
1174 static ssize_t proc_mf_change_vmlinux(struct file *file,
1175                                       const char __user *buf,
1176                                       size_t count, loff_t *ppos)
1177 {
1178         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
1179         ssize_t rc;
1180         dma_addr_t dma_addr;
1181         char *page;
1182         struct vsp_cmd_data vsp_cmd;
1183
1184         rc = -EACCES;
1185         if (!capable(CAP_SYS_ADMIN))
1186                 goto out;
1187
1188         dma_addr = 0;
1189         page = iseries_hv_alloc(count, &dma_addr, GFP_ATOMIC);
1190         rc = -ENOMEM;
1191         if (page == NULL) {
1192                 printk(KERN_ERR "mf.c: couldn't allocate memory to set vmlinux chunk\n");
1193                 goto out;
1194         }
1195         rc = -EFAULT;
1196         if (copy_from_user(page, buf, count))
1197                 goto out_free;
1198
1199         memset(&vsp_cmd, 0, sizeof(vsp_cmd));
1200         vsp_cmd.cmd = 30;
1201         vsp_cmd.sub_data.kern.token = dma_addr;
1202         vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
1203         vsp_cmd.sub_data.kern.side = (u64)dp->data;
1204         vsp_cmd.sub_data.kern.offset = *ppos;
1205         vsp_cmd.sub_data.kern.length = count;
1206         mb();
1207         rc = signal_vsp_instruction(&vsp_cmd);
1208         if (rc)
1209                 goto out_free;
1210         rc = -ENOMEM;
1211         if (vsp_cmd.result_code != 0)
1212                 goto out_free;
1213
1214         *ppos += count;
1215         rc = count;
1216 out_free:
1217         iseries_hv_free(count, page, dma_addr);
1218 out:
1219         return rc;
1220 }
1221
1222 static const struct file_operations proc_vmlinux_operations = {
1223         .write          = proc_mf_change_vmlinux,
1224 };
1225
1226 static int __init mf_proc_init(void)
1227 {
1228         struct proc_dir_entry *mf_proc_root;
1229         struct proc_dir_entry *ent;
1230         struct proc_dir_entry *mf;
1231         char name[2];
1232         int i;
1233
1234         if (!firmware_has_feature(FW_FEATURE_ISERIES))
1235                 return 0;
1236
1237         mf_proc_root = proc_mkdir("iSeries/mf", NULL);
1238         if (!mf_proc_root)
1239                 return 1;
1240
1241         name[1] = '\0';
1242         for (i = 0; i < 4; i++) {
1243                 name[0] = 'A' + i;
1244                 mf = proc_mkdir(name, mf_proc_root);
1245                 if (!mf)
1246                         return 1;
1247
1248                 ent = create_proc_entry("cmdline", S_IFREG|S_IRUSR|S_IWUSR, mf);
1249                 if (!ent)
1250                         return 1;
1251                 ent->data = (void *)(long)i;
1252                 ent->read_proc = proc_mf_dump_cmdline;
1253                 ent->write_proc = proc_mf_change_cmdline;
1254
1255                 if (i == 3)     /* no vmlinux entry for 'D' */
1256                         continue;
1257
1258                 ent = create_proc_entry("vmlinux", S_IFREG|S_IWUSR, mf);
1259                 if (!ent)
1260                         return 1;
1261                 ent->data = (void *)(long)i;
1262                 ent->proc_fops = &proc_vmlinux_operations;
1263         }
1264
1265         ent = create_proc_entry("side", S_IFREG|S_IRUSR|S_IWUSR, mf_proc_root);
1266         if (!ent)
1267                 return 1;
1268         ent->data = (void *)0;
1269         ent->read_proc = proc_mf_dump_side;
1270         ent->write_proc = proc_mf_change_side;
1271
1272         ent = create_proc_entry("src", S_IFREG|S_IRUSR|S_IWUSR, mf_proc_root);
1273         if (!ent)
1274                 return 1;
1275         ent->data = (void *)0;
1276         ent->read_proc = proc_mf_dump_src;
1277         ent->write_proc = proc_mf_change_src;
1278
1279         return 0;
1280 }
1281
1282 __initcall(mf_proc_init);
1283
1284 #endif /* CONFIG_PROC_FS */
1285
1286 /*
1287  * Get the RTC from the virtual service processor
1288  * This requires flowing LpEvents to the primary partition
1289  */
1290 void iSeries_get_rtc_time(struct rtc_time *rtc_tm)
1291 {
1292         mf_get_rtc(rtc_tm);
1293         rtc_tm->tm_mon--;
1294 }
1295
1296 /*
1297  * Set the RTC in the virtual service processor
1298  * This requires flowing LpEvents to the primary partition
1299  */
1300 int iSeries_set_rtc_time(struct rtc_time *tm)
1301 {
1302         mf_set_rtc(tm);
1303         return 0;
1304 }
1305
1306 unsigned long iSeries_get_boot_time(void)
1307 {
1308         struct rtc_time tm;
1309
1310         mf_get_boot_rtc(&tm);
1311         return mktime(tm.tm_year + 1900, tm.tm_mon, tm.tm_mday,
1312                       tm.tm_hour, tm.tm_min, tm.tm_sec);
1313 }