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[PATCH] briq_panel: read() and write() get __user pointers, damnit
[linux-2.6/verdex.git] / arch / ppc / syslib / ppc85xx_rio.c
blobd9b471b4d6954b175b4ff4a6e0b9342b1a014fd3
1 /*
2 * MPC85xx RapidIO support
3 *
4 * Copyright 2005 MontaVista Software, Inc.
5 * Matt Porter <mporter@kernel.crashing.org>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/dma-mapping.h>
17 #include <linux/interrupt.h>
18 #include <linux/rio.h>
19 #include <linux/rio_drv.h>
20
21 #include <asm/io.h>
22
23 #define RIO_REGS_BASE (CCSRBAR + 0xc0000)
24 #define RIO_ATMU_REGS_OFFSET 0x10c00
25 #define RIO_MSG_REGS_OFFSET 0x11000
26 #define RIO_MAINT_WIN_SIZE 0x400000
27 #define RIO_DBELL_WIN_SIZE 0x1000
28
29 #define RIO_MSG_OMR_MUI 0x00000002
30 #define RIO_MSG_OSR_TE 0x00000080
31 #define RIO_MSG_OSR_QOI 0x00000020
32 #define RIO_MSG_OSR_QFI 0x00000010
33 #define RIO_MSG_OSR_MUB 0x00000004
34 #define RIO_MSG_OSR_EOMI 0x00000002
35 #define RIO_MSG_OSR_QEI 0x00000001
36
37 #define RIO_MSG_IMR_MI 0x00000002
38 #define RIO_MSG_ISR_TE 0x00000080
39 #define RIO_MSG_ISR_QFI 0x00000010
40 #define RIO_MSG_ISR_DIQI 0x00000001
41
42 #define RIO_MSG_DESC_SIZE 32
43 #define RIO_MSG_BUFFER_SIZE 4096
44 #define RIO_MIN_TX_RING_SIZE 2
45 #define RIO_MAX_TX_RING_SIZE 2048
46 #define RIO_MIN_RX_RING_SIZE 2
47 #define RIO_MAX_RX_RING_SIZE 2048
48
49 #define DOORBELL_DMR_DI 0x00000002
50 #define DOORBELL_DSR_TE 0x00000080
51 #define DOORBELL_DSR_QFI 0x00000010
52 #define DOORBELL_DSR_DIQI 0x00000001
53 #define DOORBELL_TID_OFFSET 0x03
54 #define DOORBELL_SID_OFFSET 0x05
55 #define DOORBELL_INFO_OFFSET 0x06
56
57 #define DOORBELL_MESSAGE_SIZE 0x08
58 #define DBELL_SID(x) (*(u8 *)(x + DOORBELL_SID_OFFSET))
59 #define DBELL_TID(x) (*(u8 *)(x + DOORBELL_TID_OFFSET))
60 #define DBELL_INF(x) (*(u16 *)(x + DOORBELL_INFO_OFFSET))
61
62 #define is_power_of_2(x) (((x) & ((x) - 1)) == 0)
63
64 struct rio_atmu_regs {
65 u32 rowtar;
66 u32 pad1;
67 u32 rowbar;
68 u32 pad2;
69 u32 rowar;
70 u32 pad3[3];
71 };
72
73 struct rio_msg_regs {
74 u32 omr;
75 u32 osr;
76 u32 pad1;
77 u32 odqdpar;
78 u32 pad2;
79 u32 osar;
80 u32 odpr;
81 u32 odatr;
82 u32 odcr;
83 u32 pad3;
84 u32 odqepar;
85 u32 pad4[13];
86 u32 imr;
87 u32 isr;
88 u32 pad5;
89 u32 ifqdpar;
90 u32 pad6;
91 u32 ifqepar;
92 u32 pad7[250];
93 u32 dmr;
94 u32 dsr;
95 u32 pad8;
96 u32 dqdpar;
97 u32 pad9;
98 u32 dqepar;
99 u32 pad10[26];
100 u32 pwmr;
101 u32 pwsr;
102 u32 pad11;
103 u32 pwqbar;
104 };
105
106 struct rio_tx_desc {
107 u32 res1;
108 u32 saddr;
109 u32 dport;
110 u32 dattr;
111 u32 res2;
112 u32 res3;
113 u32 dwcnt;
114 u32 res4;
115 };
116
117 static u32 regs_win;
118 static struct rio_atmu_regs *atmu_regs;
119 static struct rio_atmu_regs *maint_atmu_regs;
120 static struct rio_atmu_regs *dbell_atmu_regs;
121 static u32 dbell_win;
122 static u32 maint_win;
123 static struct rio_msg_regs *msg_regs;
124
125 static struct rio_dbell_ring {
126 void *virt;
127 dma_addr_t phys;
128 } dbell_ring;
129
130 static struct rio_msg_tx_ring {
131 void *virt;
132 dma_addr_t phys;
133 void *virt_buffer[RIO_MAX_TX_RING_SIZE];
134 dma_addr_t phys_buffer[RIO_MAX_TX_RING_SIZE];
135 int tx_slot;
136 int size;
137 void *dev_id;
138 } msg_tx_ring;
139
140 static struct rio_msg_rx_ring {
141 void *virt;
142 dma_addr_t phys;
143 void *virt_buffer[RIO_MAX_RX_RING_SIZE];
144 int rx_slot;
145 int size;
146 void *dev_id;
147 } msg_rx_ring;
148
149 /**
150 * mpc85xx_rio_doorbell_send - Send a MPC85xx doorbell message
151 * @index: ID of RapidIO interface
152 * @destid: Destination ID of target device
153 * @data: 16-bit info field of RapidIO doorbell message
154 *
155 * Sends a MPC85xx doorbell message. Returns %0 on success or
156 * %-EINVAL on failure.
157 */
158 static int mpc85xx_rio_doorbell_send(int index, u16 destid, u16 data)
159 {
160 pr_debug("mpc85xx_doorbell_send: index %d destid %4.4x data %4.4x\n",
161 index, destid, data);
162 out_be32((void *)&dbell_atmu_regs->rowtar, destid << 22);
163 out_be16((void *)(dbell_win), data);
164
165 return 0;
166 }
167
168 /**
169 * mpc85xx_local_config_read - Generate a MPC85xx local config space read
170 * @index: ID of RapdiIO interface
171 * @offset: Offset into configuration space
172 * @len: Length (in bytes) of the maintenance transaction
173 * @data: Value to be read into
174 *
175 * Generates a MPC85xx local configuration space read. Returns %0 on
176 * success or %-EINVAL on failure.
177 */
178 static int mpc85xx_local_config_read(int index, u32 offset, int len, u32 * data)
179 {
180 pr_debug("mpc85xx_local_config_read: index %d offset %8.8x\n", index,
181 offset);
182 *data = in_be32((void *)(regs_win + offset));
183
184 return 0;
185 }
186
187 /**
188 * mpc85xx_local_config_write - Generate a MPC85xx local config space write
189 * @index: ID of RapdiIO interface
190 * @offset: Offset into configuration space
191 * @len: Length (in bytes) of the maintenance transaction
192 * @data: Value to be written
193 *
194 * Generates a MPC85xx local configuration space write. Returns %0 on
195 * success or %-EINVAL on failure.
196 */
197 static int mpc85xx_local_config_write(int index, u32 offset, int len, u32 data)
198 {
199 pr_debug
200 ("mpc85xx_local_config_write: index %d offset %8.8x data %8.8x\n",
201 index, offset, data);
202 out_be32((void *)(regs_win + offset), data);
203
204 return 0;
205 }
206
207 /**
208 * mpc85xx_rio_config_read - Generate a MPC85xx read maintenance transaction
209 * @index: ID of RapdiIO interface
210 * @destid: Destination ID of transaction
211 * @hopcount: Number of hops to target device
212 * @offset: Offset into configuration space
213 * @len: Length (in bytes) of the maintenance transaction
214 * @val: Location to be read into
215 *
216 * Generates a MPC85xx read maintenance transaction. Returns %0 on
217 * success or %-EINVAL on failure.
218 */
219 static int
220 mpc85xx_rio_config_read(int index, u16 destid, u8 hopcount, u32 offset, int len,
221 u32 * val)
222 {
223 u8 *data;
224
225 pr_debug
226 ("mpc85xx_rio_config_read: index %d destid %d hopcount %d offset %8.8x len %d\n",
227 index, destid, hopcount, offset, len);
228 out_be32((void *)&maint_atmu_regs->rowtar,
229 (destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9));
230
231 data = (u8 *) maint_win + offset;
232 switch (len) {
233 case 1:
234 *val = in_8((u8 *) data);
235 break;
236 case 2:
237 *val = in_be16((u16 *) data);
238 break;
239 default:
240 *val = in_be32((u32 *) data);
241 break;
242 }
243
244 return 0;
245 }
246
247 /**
248 * mpc85xx_rio_config_write - Generate a MPC85xx write maintenance transaction
249 * @index: ID of RapdiIO interface
250 * @destid: Destination ID of transaction
251 * @hopcount: Number of hops to target device
252 * @offset: Offset into configuration space
253 * @len: Length (in bytes) of the maintenance transaction
254 * @val: Value to be written
255 *
256 * Generates an MPC85xx write maintenance transaction. Returns %0 on
257 * success or %-EINVAL on failure.
258 */
259 static int
260 mpc85xx_rio_config_write(int index, u16 destid, u8 hopcount, u32 offset,
261 int len, u32 val)
262 {
263 u8 *data;
264 pr_debug
265 ("mpc85xx_rio_config_write: index %d destid %d hopcount %d offset %8.8x len %d val %8.8x\n",
266 index, destid, hopcount, offset, len, val);
267 out_be32((void *)&maint_atmu_regs->rowtar,
268 (destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9));
269
270 data = (u8 *) maint_win + offset;
271 switch (len) {
272 case 1:
273 out_8((u8 *) data, val);
274 break;
275 case 2:
276 out_be16((u16 *) data, val);
277 break;
278 default:
279 out_be32((u32 *) data, val);
280 break;
281 }
282
283 return 0;
284 }
285
286 /**
287 * rio_hw_add_outb_message - Add message to the MPC85xx outbound message queue
288 * @mport: Master port with outbound message queue
289 * @rdev: Target of outbound message
290 * @mbox: Outbound mailbox
291 * @buffer: Message to add to outbound queue
292 * @len: Length of message
293 *
294 * Adds the @buffer message to the MPC85xx outbound message queue. Returns
295 * %0 on success or %-EINVAL on failure.
296 */
297 int
298 rio_hw_add_outb_message(struct rio_mport *mport, struct rio_dev *rdev, int mbox,
299 void *buffer, size_t len)
300 {
301 u32 omr;
302 struct rio_tx_desc *desc =
303 (struct rio_tx_desc *)msg_tx_ring.virt + msg_tx_ring.tx_slot;
304 int ret = 0;
305
306 pr_debug
307 ("RIO: rio_hw_add_outb_message(): destid %4.4x mbox %d buffer %8.8x len %8.8x\n",
308 rdev->destid, mbox, (int)buffer, len);
309
310 if ((len < 8) || (len > RIO_MAX_MSG_SIZE)) {
311 ret = -EINVAL;
312 goto out;
313 }
314
315 /* Copy and clear rest of buffer */
316 memcpy(msg_tx_ring.virt_buffer[msg_tx_ring.tx_slot], buffer, len);
317 if (len < (RIO_MAX_MSG_SIZE - 4))
318 memset((void *)((u32) msg_tx_ring.
319 virt_buffer[msg_tx_ring.tx_slot] + len), 0,
320 RIO_MAX_MSG_SIZE - len);
321
322 /* Set mbox field for message */
323 desc->dport = mbox & 0x3;
324
325 /* Enable EOMI interrupt, set priority, and set destid */
326 desc->dattr = 0x28000000 | (rdev->destid << 2);
327
328 /* Set transfer size aligned to next power of 2 (in double words) */
329 desc->dwcnt = is_power_of_2(len) ? len : 1 << get_bitmask_order(len);
330
331 /* Set snooping and source buffer address */
332 desc->saddr = 0x00000004 | msg_tx_ring.phys_buffer[msg_tx_ring.tx_slot];
333
334 /* Increment enqueue pointer */
335 omr = in_be32((void *)&msg_regs->omr);
336 out_be32((void *)&msg_regs->omr, omr | RIO_MSG_OMR_MUI);
337
338 /* Go to next descriptor */
339 if (++msg_tx_ring.tx_slot == msg_tx_ring.size)
340 msg_tx_ring.tx_slot = 0;
341
342 out:
343 return ret;
344 }
345
346 EXPORT_SYMBOL_GPL(rio_hw_add_outb_message);
347
348 /**
349 * mpc85xx_rio_tx_handler - MPC85xx outbound message interrupt handler
350 * @irq: Linux interrupt number
351 * @dev_instance: Pointer to interrupt-specific data
352 * @regs: Register context
353 *
354 * Handles outbound message interrupts. Executes a register outbound
355 * mailbox event handler and acks the interrupt occurence.
356 */
357 static irqreturn_t
358 mpc85xx_rio_tx_handler(int irq, void *dev_instance, struct pt_regs *regs)
359 {
360 int osr;
361 struct rio_mport *port = (struct rio_mport *)dev_instance;
362
363 osr = in_be32((void *)&msg_regs->osr);
364
365 if (osr & RIO_MSG_OSR_TE) {
366 pr_info("RIO: outbound message transmission error\n");
367 out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_TE);
368 goto out;
369 }
370
371 if (osr & RIO_MSG_OSR_QOI) {
372 pr_info("RIO: outbound message queue overflow\n");
373 out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_QOI);
374 goto out;
375 }
376
377 if (osr & RIO_MSG_OSR_EOMI) {
378 u32 dqp = in_be32((void *)&msg_regs->odqdpar);
379 int slot = (dqp - msg_tx_ring.phys) >> 5;
380 port->outb_msg[0].mcback(port, msg_tx_ring.dev_id, -1, slot);
381
382 /* Ack the end-of-message interrupt */
383 out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_EOMI);
384 }
385
386 out:
387 return IRQ_HANDLED;
388 }
389
390 /**
391 * rio_open_outb_mbox - Initialize MPC85xx outbound mailbox
392 * @mport: Master port implementing the outbound message unit
393 * @dev_id: Device specific pointer to pass on event
394 * @mbox: Mailbox to open
395 * @entries: Number of entries in the outbound mailbox ring
396 *
397 * Initializes buffer ring, request the outbound message interrupt,
398 * and enables the outbound message unit. Returns %0 on success and
399 * %-EINVAL or %-ENOMEM on failure.
400 */
401 int rio_open_outb_mbox(struct rio_mport *mport, void *dev_id, int mbox, int entries)
402 {
403 int i, j, rc = 0;
404
405 if ((entries < RIO_MIN_TX_RING_SIZE) ||
406 (entries > RIO_MAX_TX_RING_SIZE) || (!is_power_of_2(entries))) {
407 rc = -EINVAL;
408 goto out;
409 }
410
411 /* Initialize shadow copy ring */
412 msg_tx_ring.dev_id = dev_id;
413 msg_tx_ring.size = entries;
414
415 for (i = 0; i < msg_tx_ring.size; i++) {
416 if (!
417 (msg_tx_ring.virt_buffer[i] =
418 dma_alloc_coherent(NULL, RIO_MSG_BUFFER_SIZE,
419 &msg_tx_ring.phys_buffer[i],
420 GFP_KERNEL))) {
421 rc = -ENOMEM;
422 for (j = 0; j < msg_tx_ring.size; j++)
423 if (msg_tx_ring.virt_buffer[j])
424 dma_free_coherent(NULL,
425 RIO_MSG_BUFFER_SIZE,
426 msg_tx_ring.
427 virt_buffer[j],
428 msg_tx_ring.
429 phys_buffer[j]);
430 goto out;
431 }
432 }
433
434 /* Initialize outbound message descriptor ring */
435 if (!(msg_tx_ring.virt = dma_alloc_coherent(NULL,
436 msg_tx_ring.size *
437 RIO_MSG_DESC_SIZE,
438 &msg_tx_ring.phys,
439 GFP_KERNEL))) {
440 rc = -ENOMEM;
441 goto out_dma;
442 }
443 memset(msg_tx_ring.virt, 0, msg_tx_ring.size * RIO_MSG_DESC_SIZE);
444 msg_tx_ring.tx_slot = 0;
445
446 /* Point dequeue/enqueue pointers at first entry in ring */
447 out_be32((void *)&msg_regs->odqdpar, msg_tx_ring.phys);
448 out_be32((void *)&msg_regs->odqepar, msg_tx_ring.phys);
449
450 /* Configure for snooping */
451 out_be32((void *)&msg_regs->osar, 0x00000004);
452
453 /* Clear interrupt status */
454 out_be32((void *)&msg_regs->osr, 0x000000b3);
455
456 /* Hook up outbound message handler */
457 if ((rc =
458 request_irq(MPC85xx_IRQ_RIO_TX, mpc85xx_rio_tx_handler, 0,
459 "msg_tx", (void *)mport)) < 0)
460 goto out_irq;
461
462 /*
463 * Configure outbound message unit
464 * Snooping
465 * Interrupts (all enabled, except QEIE)
466 * Chaining mode
467 * Disable
468 */
469 out_be32((void *)&msg_regs->omr, 0x00100220);
470
471 /* Set number of entries */
472 out_be32((void *)&msg_regs->omr,
473 in_be32((void *)&msg_regs->omr) |
474 ((get_bitmask_order(entries) - 2) << 12));
475
476 /* Now enable the unit */
477 out_be32((void *)&msg_regs->omr, in_be32((void *)&msg_regs->omr) | 0x1);
478
479 out:
480 return rc;
481
482 out_irq:
483 dma_free_coherent(NULL, msg_tx_ring.size * RIO_MSG_DESC_SIZE,
484 msg_tx_ring.virt, msg_tx_ring.phys);
485
486 out_dma:
487 for (i = 0; i < msg_tx_ring.size; i++)
488 dma_free_coherent(NULL, RIO_MSG_BUFFER_SIZE,
489 msg_tx_ring.virt_buffer[i],
490 msg_tx_ring.phys_buffer[i]);
491
492 return rc;
493 }
494
495 /**
496 * rio_close_outb_mbox - Shut down MPC85xx outbound mailbox
497 * @mport: Master port implementing the outbound message unit
498 * @mbox: Mailbox to close
499 *
500 * Disables the outbound message unit, free all buffers, and
501 * frees the outbound message interrupt.
502 */
503 void rio_close_outb_mbox(struct rio_mport *mport, int mbox)
504 {
505 /* Disable inbound message unit */
506 out_be32((void *)&msg_regs->omr, 0);
507
508 /* Free ring */
509 dma_free_coherent(NULL, msg_tx_ring.size * RIO_MSG_DESC_SIZE,
510 msg_tx_ring.virt, msg_tx_ring.phys);
511
512 /* Free interrupt */
513 free_irq(MPC85xx_IRQ_RIO_TX, (void *)mport);
514 }
515
516 /**
517 * mpc85xx_rio_rx_handler - MPC85xx inbound message interrupt handler
518 * @irq: Linux interrupt number
519 * @dev_instance: Pointer to interrupt-specific data
520 * @regs: Register context
521 *
522 * Handles inbound message interrupts. Executes a registered inbound
523 * mailbox event handler and acks the interrupt occurence.
524 */
525 static irqreturn_t
526 mpc85xx_rio_rx_handler(int irq, void *dev_instance, struct pt_regs *regs)
527 {
528 int isr;
529 struct rio_mport *port = (struct rio_mport *)dev_instance;
530
531 isr = in_be32((void *)&msg_regs->isr);
532
533 if (isr & RIO_MSG_ISR_TE) {
534 pr_info("RIO: inbound message reception error\n");
535 out_be32((void *)&msg_regs->isr, RIO_MSG_ISR_TE);
536 goto out;
537 }
538
539 /* XXX Need to check/dispatch until queue empty */
540 if (isr & RIO_MSG_ISR_DIQI) {
541 /*
542 * We implement *only* mailbox 0, but can receive messages
543 * for any mailbox/letter to that mailbox destination. So,
544 * make the callback with an unknown/invalid mailbox number
545 * argument.
546 */
547 port->inb_msg[0].mcback(port, msg_rx_ring.dev_id, -1, -1);
548
549 /* Ack the queueing interrupt */
550 out_be32((void *)&msg_regs->isr, RIO_MSG_ISR_DIQI);
551 }
552
553 out:
554 return IRQ_HANDLED;
555 }
556
557 /**
558 * rio_open_inb_mbox - Initialize MPC85xx inbound mailbox
559 * @mport: Master port implementing the inbound message unit
560 * @dev_id: Device specific pointer to pass on event
561 * @mbox: Mailbox to open
562 * @entries: Number of entries in the inbound mailbox ring
563 *
564 * Initializes buffer ring, request the inbound message interrupt,
565 * and enables the inbound message unit. Returns %0 on success
566 * and %-EINVAL or %-ENOMEM on failure.
567 */
568 int rio_open_inb_mbox(struct rio_mport *mport, void *dev_id, int mbox, int entries)
569 {
570 int i, rc = 0;
571
572 if ((entries < RIO_MIN_RX_RING_SIZE) ||
573 (entries > RIO_MAX_RX_RING_SIZE) || (!is_power_of_2(entries))) {
574 rc = -EINVAL;
575 goto out;
576 }
577
578 /* Initialize client buffer ring */
579 msg_rx_ring.dev_id = dev_id;
580 msg_rx_ring.size = entries;
581 msg_rx_ring.rx_slot = 0;
582 for (i = 0; i < msg_rx_ring.size; i++)
583 msg_rx_ring.virt_buffer[i] = NULL;
584
585 /* Initialize inbound message ring */
586 if (!(msg_rx_ring.virt = dma_alloc_coherent(NULL,
587 msg_rx_ring.size *
588 RIO_MAX_MSG_SIZE,
589 &msg_rx_ring.phys,
590 GFP_KERNEL))) {
591 rc = -ENOMEM;
592 goto out;
593 }
594
595 /* Point dequeue/enqueue pointers at first entry in ring */
596 out_be32((void *)&msg_regs->ifqdpar, (u32) msg_rx_ring.phys);
597 out_be32((void *)&msg_regs->ifqepar, (u32) msg_rx_ring.phys);
598
599 /* Clear interrupt status */
600 out_be32((void *)&msg_regs->isr, 0x00000091);
601
602 /* Hook up inbound message handler */
603 if ((rc =
604 request_irq(MPC85xx_IRQ_RIO_RX, mpc85xx_rio_rx_handler, 0,
605 "msg_rx", (void *)mport)) < 0) {
606 dma_free_coherent(NULL, RIO_MSG_BUFFER_SIZE,
607 msg_tx_ring.virt_buffer[i],
608 msg_tx_ring.phys_buffer[i]);
609 goto out;
610 }
611
612 /*
613 * Configure inbound message unit:
614 * Snooping
615 * 4KB max message size
616 * Unmask all interrupt sources
617 * Disable
618 */
619 out_be32((void *)&msg_regs->imr, 0x001b0060);
620
621 /* Set number of queue entries */
622 out_be32((void *)&msg_regs->imr,
623 in_be32((void *)&msg_regs->imr) |
624 ((get_bitmask_order(entries) - 2) << 12));
625
626 /* Now enable the unit */
627 out_be32((void *)&msg_regs->imr, in_be32((void *)&msg_regs->imr) | 0x1);
628
629 out:
630 return rc;
631 }
632
633 /**
634 * rio_close_inb_mbox - Shut down MPC85xx inbound mailbox
635 * @mport: Master port implementing the inbound message unit
636 * @mbox: Mailbox to close
637 *
638 * Disables the inbound message unit, free all buffers, and
639 * frees the inbound message interrupt.
640 */
641 void rio_close_inb_mbox(struct rio_mport *mport, int mbox)
642 {
643 /* Disable inbound message unit */
644 out_be32((void *)&msg_regs->imr, 0);
645
646 /* Free ring */
647 dma_free_coherent(NULL, msg_rx_ring.size * RIO_MAX_MSG_SIZE,
648 msg_rx_ring.virt, msg_rx_ring.phys);
649
650 /* Free interrupt */
651 free_irq(MPC85xx_IRQ_RIO_RX, (void *)mport);
652 }
653
654 /**
655 * rio_hw_add_inb_buffer - Add buffer to the MPC85xx inbound message queue
656 * @mport: Master port implementing the inbound message unit
657 * @mbox: Inbound mailbox number
658 * @buf: Buffer to add to inbound queue
659 *
660 * Adds the @buf buffer to the MPC85xx inbound message queue. Returns
661 * %0 on success or %-EINVAL on failure.
662 */
663 int rio_hw_add_inb_buffer(struct rio_mport *mport, int mbox, void *buf)
664 {
665 int rc = 0;
666
667 pr_debug("RIO: rio_hw_add_inb_buffer(), msg_rx_ring.rx_slot %d\n",
668 msg_rx_ring.rx_slot);
669
670 if (msg_rx_ring.virt_buffer[msg_rx_ring.rx_slot]) {
671 printk(KERN_ERR
672 "RIO: error adding inbound buffer %d, buffer exists\n",
673 msg_rx_ring.rx_slot);
674 rc = -EINVAL;
675 goto out;
676 }
677
678 msg_rx_ring.virt_buffer[msg_rx_ring.rx_slot] = buf;
679 if (++msg_rx_ring.rx_slot == msg_rx_ring.size)
680 msg_rx_ring.rx_slot = 0;
681
682 out:
683 return rc;
684 }
685
686 EXPORT_SYMBOL_GPL(rio_hw_add_inb_buffer);
687
688 /**
689 * rio_hw_get_inb_message - Fetch inbound message from the MPC85xx message unit
690 * @mport: Master port implementing the inbound message unit
691 * @mbox: Inbound mailbox number
692 *
693 * Gets the next available inbound message from the inbound message queue.
694 * A pointer to the message is returned on success or NULL on failure.
695 */
696 void *rio_hw_get_inb_message(struct rio_mport *mport, int mbox)
697 {
698 u32 imr;
699 u32 phys_buf, virt_buf;
700 void *buf = NULL;
701 int buf_idx;
702
703 phys_buf = in_be32((void *)&msg_regs->ifqdpar);
704
705 /* If no more messages, then bail out */
706 if (phys_buf == in_be32((void *)&msg_regs->ifqepar))
707 goto out2;
708
709 virt_buf = (u32) msg_rx_ring.virt + (phys_buf - msg_rx_ring.phys);
710 buf_idx = (phys_buf - msg_rx_ring.phys) / RIO_MAX_MSG_SIZE;
711 buf = msg_rx_ring.virt_buffer[buf_idx];
712
713 if (!buf) {
714 printk(KERN_ERR
715 "RIO: inbound message copy failed, no buffers\n");
716 goto out1;
717 }
718
719 /* Copy max message size, caller is expected to allocate that big */
720 memcpy(buf, (void *)virt_buf, RIO_MAX_MSG_SIZE);
721
722 /* Clear the available buffer */
723 msg_rx_ring.virt_buffer[buf_idx] = NULL;
724
725 out1:
726 imr = in_be32((void *)&msg_regs->imr);
727 out_be32((void *)&msg_regs->imr, imr | RIO_MSG_IMR_MI);
728
729 out2:
730 return buf;
731 }
732
733 EXPORT_SYMBOL_GPL(rio_hw_get_inb_message);
734
735 /**
736 * mpc85xx_rio_dbell_handler - MPC85xx doorbell interrupt handler
737 * @irq: Linux interrupt number
738 * @dev_instance: Pointer to interrupt-specific data
739 * @regs: Register context
740 *
741 * Handles doorbell interrupts. Parses a list of registered
742 * doorbell event handlers and executes a matching event handler.
743 */
744 static irqreturn_t
745 mpc85xx_rio_dbell_handler(int irq, void *dev_instance, struct pt_regs *regs)
746 {
747 int dsr;
748 struct rio_mport *port = (struct rio_mport *)dev_instance;
749
750 dsr = in_be32((void *)&msg_regs->dsr);
751
752 if (dsr & DOORBELL_DSR_TE) {
753 pr_info("RIO: doorbell reception error\n");
754 out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_TE);
755 goto out;
756 }
757
758 if (dsr & DOORBELL_DSR_QFI) {
759 pr_info("RIO: doorbell queue full\n");
760 out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_QFI);
761 goto out;
762 }
763
764 /* XXX Need to check/dispatch until queue empty */
765 if (dsr & DOORBELL_DSR_DIQI) {
766 u32 dmsg =
767 (u32) dbell_ring.virt +
768 (in_be32((void *)&msg_regs->dqdpar) & 0xfff);
769 u32 dmr;
770 struct rio_dbell *dbell;
771 int found = 0;
772
773 pr_debug
774 ("RIO: processing doorbell, sid %2.2x tid %2.2x info %4.4x\n",
775 DBELL_SID(dmsg), DBELL_TID(dmsg), DBELL_INF(dmsg));
776
777 list_for_each_entry(dbell, &port->dbells, node) {
778 if ((dbell->res->start <= DBELL_INF(dmsg)) &&
779 (dbell->res->end >= DBELL_INF(dmsg))) {
780 found = 1;
781 break;
782 }
783 }
784 if (found) {
785 dbell->dinb(port, dbell->dev_id, DBELL_SID(dmsg), DBELL_TID(dmsg),
786 DBELL_INF(dmsg));
787 } else {
788 pr_debug
789 ("RIO: spurious doorbell, sid %2.2x tid %2.2x info %4.4x\n",
790 DBELL_SID(dmsg), DBELL_TID(dmsg), DBELL_INF(dmsg));
791 }
792 dmr = in_be32((void *)&msg_regs->dmr);
793 out_be32((void *)&msg_regs->dmr, dmr | DOORBELL_DMR_DI);
794 out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_DIQI);
795 }
796
797 out:
798 return IRQ_HANDLED;
799 }
800
801 /**
802 * mpc85xx_rio_doorbell_init - MPC85xx doorbell interface init
803 * @mport: Master port implementing the inbound doorbell unit
804 *
805 * Initializes doorbell unit hardware and inbound DMA buffer
806 * ring. Called from mpc85xx_rio_setup(). Returns %0 on success
807 * or %-ENOMEM on failure.
808 */
809 static int mpc85xx_rio_doorbell_init(struct rio_mport *mport)
810 {
811 int rc = 0;
812
813 /* Map outbound doorbell window immediately after maintenance window */
814 if (!(dbell_win =
815 (u32) ioremap(mport->iores.start + RIO_MAINT_WIN_SIZE,
816 RIO_DBELL_WIN_SIZE))) {
817 printk(KERN_ERR
818 "RIO: unable to map outbound doorbell window\n");
819 rc = -ENOMEM;
820 goto out;
821 }
822
823 /* Initialize inbound doorbells */
824 if (!(dbell_ring.virt = dma_alloc_coherent(NULL,
825 512 * DOORBELL_MESSAGE_SIZE,
826 &dbell_ring.phys,
827 GFP_KERNEL))) {
828 printk(KERN_ERR "RIO: unable allocate inbound doorbell ring\n");
829 rc = -ENOMEM;
830 iounmap((void *)dbell_win);
831 goto out;
832 }
833
834 /* Point dequeue/enqueue pointers at first entry in ring */
835 out_be32((void *)&msg_regs->dqdpar, (u32) dbell_ring.phys);
836 out_be32((void *)&msg_regs->dqepar, (u32) dbell_ring.phys);
837
838 /* Clear interrupt status */
839 out_be32((void *)&msg_regs->dsr, 0x00000091);
840
841 /* Hook up doorbell handler */
842 if ((rc =
843 request_irq(MPC85xx_IRQ_RIO_BELL, mpc85xx_rio_dbell_handler, 0,
844 "dbell_rx", (void *)mport) < 0)) {
845 iounmap((void *)dbell_win);
846 dma_free_coherent(NULL, 512 * DOORBELL_MESSAGE_SIZE,
847 dbell_ring.virt, dbell_ring.phys);
848 printk(KERN_ERR
849 "MPC85xx RIO: unable to request inbound doorbell irq");
850 goto out;
851 }
852
853 /* Configure doorbells for snooping, 512 entries, and enable */
854 out_be32((void *)&msg_regs->dmr, 0x00108161);
855
856 out:
857 return rc;
858 }
859
860 static char *cmdline = NULL;
861
862 static int mpc85xx_rio_get_hdid(int index)
863 {
864 /* XXX Need to parse multiple entries in some format */
865 if (!cmdline)
866 return -1;
867
868 return simple_strtol(cmdline, NULL, 0);
869 }
870
871 static int mpc85xx_rio_get_cmdline(char *s)
872 {
873 if (!s)
874 return 0;
875
876 cmdline = s;
877 return 1;
878 }
879
880 __setup("riohdid=", mpc85xx_rio_get_cmdline);
881
882 /**
883 * mpc85xx_rio_setup - Setup MPC85xx RapidIO interface
884 * @law_start: Starting physical address of RapidIO LAW
885 * @law_size: Size of RapidIO LAW
886 *
887 * Initializes MPC85xx RapidIO hardware interface, configures
888 * master port with system-specific info, and registers the
889 * master port with the RapidIO subsystem.
890 */
891 void mpc85xx_rio_setup(int law_start, int law_size)
892 {
893 struct rio_ops *ops;
894 struct rio_mport *port;
895
896 ops = kmalloc(sizeof(struct rio_ops), GFP_KERNEL);
897 ops->lcread = mpc85xx_local_config_read;
898 ops->lcwrite = mpc85xx_local_config_write;
899 ops->cread = mpc85xx_rio_config_read;
900 ops->cwrite = mpc85xx_rio_config_write;
901 ops->dsend = mpc85xx_rio_doorbell_send;
902
903 port = kmalloc(sizeof(struct rio_mport), GFP_KERNEL);
904 port->id = 0;
905 port->index = 0;
906 INIT_LIST_HEAD(&port->dbells);
907 port->iores.start = law_start;
908 port->iores.end = law_start + law_size;
909 port->iores.flags = IORESOURCE_MEM;
910
911 rio_init_dbell_res(&port->riores[RIO_DOORBELL_RESOURCE], 0, 0xffff);
912 rio_init_mbox_res(&port->riores[RIO_INB_MBOX_RESOURCE], 0, 0);
913 rio_init_mbox_res(&port->riores[RIO_OUTB_MBOX_RESOURCE], 0, 0);
914 strcpy(port->name, "RIO0 mport");
915
916 port->ops = ops;
917 port->host_deviceid = mpc85xx_rio_get_hdid(port->id);
918
919 rio_register_mport(port);
920
921 regs_win = (u32) ioremap(RIO_REGS_BASE, 0x20000);
922 atmu_regs = (struct rio_atmu_regs *)(regs_win + RIO_ATMU_REGS_OFFSET);
923 maint_atmu_regs = atmu_regs + 1;
924 dbell_atmu_regs = atmu_regs + 2;
925 msg_regs = (struct rio_msg_regs *)(regs_win + RIO_MSG_REGS_OFFSET);
926
927 /* Configure maintenance transaction window */
928 out_be32((void *)&maint_atmu_regs->rowbar, 0x000c0000);
929 out_be32((void *)&maint_atmu_regs->rowar, 0x80077015);
930
931 maint_win = (u32) ioremap(law_start, RIO_MAINT_WIN_SIZE);
932
933 /* Configure outbound doorbell window */
934 out_be32((void *)&dbell_atmu_regs->rowbar, 0x000c0400);
935 out_be32((void *)&dbell_atmu_regs->rowar, 0x8004200b);
936 mpc85xx_rio_doorbell_init(port);
937 }
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