1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Freescale MPC85xx/MPC86xx RapidIO RMU support
4 *
5 * Copyright 2009 Sysgo AG
6 * Thomas Moll <thomas.moll@sysgo.com>
7 * - fixed maintenance access routines, check for aligned access
8 *
9 * Copyright 2009 Integrated Device Technology, Inc.
10 * Alex Bounine <alexandre.bounine@idt.com>
11 * - Added Port-Write message handling
12 * - Added Machine Check exception handling
13 *
14 * Copyright (C) 2007, 2008, 2010, 2011 Freescale Semiconductor, Inc.
15 * Zhang Wei <wei.zhang@freescale.com>
16 * Lian Minghuan-B31939 <Minghuan.Lian@freescale.com>
17 * Liu Gang <Gang.Liu@freescale.com>
18 *
19 * Copyright 2005 MontaVista Software, Inc.
20 * Matt Porter <mporter@kernel.crashing.org>
21 */
22
23 #include <linux/types.h>
24 #include <linux/dma-mapping.h>
25 #include <linux/interrupt.h>
26 #include <linux/of_address.h>
27 #include <linux/of_irq.h>
28 #include <linux/slab.h>
29
30 #include "fsl_rio.h"
31
32 #define GET_RMM_HANDLE(mport) \
33 (((struct rio_priv *)(mport->priv))->rmm_handle)
34
35 /* RapidIO definition irq, which read from OF-tree */
36 #define IRQ_RIO_PW(m) (((struct fsl_rio_pw *)(m))->pwirq)
37 #define IRQ_RIO_BELL(m) (((struct fsl_rio_dbell *)(m))->bellirq)
38 #define IRQ_RIO_TX(m) (((struct fsl_rmu *)(GET_RMM_HANDLE(m)))->txirq)
39 #define IRQ_RIO_RX(m) (((struct fsl_rmu *)(GET_RMM_HANDLE(m)))->rxirq)
40
41 #define RIO_MIN_TX_RING_SIZE 2
42 #define RIO_MAX_TX_RING_SIZE 2048
43 #define RIO_MIN_RX_RING_SIZE 2
44 #define RIO_MAX_RX_RING_SIZE 2048
45
46 #define RIO_IPWMR_SEN 0x00100000
47 #define RIO_IPWMR_QFIE 0x00000100
48 #define RIO_IPWMR_EIE 0x00000020
49 #define RIO_IPWMR_CQ 0x00000002
50 #define RIO_IPWMR_PWE 0x00000001
51
52 #define RIO_IPWSR_QF 0x00100000
53 #define RIO_IPWSR_TE 0x00000080
54 #define RIO_IPWSR_QFI 0x00000010
55 #define RIO_IPWSR_PWD 0x00000008
56 #define RIO_IPWSR_PWB 0x00000004
57
58 #define RIO_EPWISR 0x10010
59 /* EPWISR Error match value */
60 #define RIO_EPWISR_PINT1 0x80000000
61 #define RIO_EPWISR_PINT2 0x40000000
62 #define RIO_EPWISR_MU 0x00000002
63 #define RIO_EPWISR_PW 0x00000001
64
65 #define IPWSR_CLEAR 0x98
66 #define OMSR_CLEAR 0x1cb3
67 #define IMSR_CLEAR 0x491
68 #define IDSR_CLEAR 0x91
69 #define ODSR_CLEAR 0x1c00
70 #define LTLEECSR_ENABLE_ALL 0xFFC000FC
71 #define RIO_LTLEECSR 0x060c
72
73 #define RIO_IM0SR 0x64
74 #define RIO_IM1SR 0x164
75 #define RIO_OM0SR 0x4
76 #define RIO_OM1SR 0x104
77
78 #define RIO_DBELL_WIN_SIZE 0x1000
79
80 #define RIO_MSG_OMR_MUI 0x00000002
81 #define RIO_MSG_OSR_TE 0x00000080
82 #define RIO_MSG_OSR_QOI 0x00000020
83 #define RIO_MSG_OSR_QFI 0x00000010
84 #define RIO_MSG_OSR_MUB 0x00000004
85 #define RIO_MSG_OSR_EOMI 0x00000002
86 #define RIO_MSG_OSR_QEI 0x00000001
87
88 #define RIO_MSG_IMR_MI 0x00000002
89 #define RIO_MSG_ISR_TE 0x00000080
90 #define RIO_MSG_ISR_QFI 0x00000010
91 #define RIO_MSG_ISR_DIQI 0x00000001
92
93 #define RIO_MSG_DESC_SIZE 32
94 #define RIO_MSG_BUFFER_SIZE 4096
95
96 #define DOORBELL_DMR_DI 0x00000002
97 #define DOORBELL_DSR_TE 0x00000080
98 #define DOORBELL_DSR_QFI 0x00000010
99 #define DOORBELL_DSR_DIQI 0x00000001
100
101 #define DOORBELL_MESSAGE_SIZE 0x08
102
103 static DEFINE_SPINLOCK(fsl_rio_doorbell_lock);
104
105 struct rio_msg_regs {
106 u32 omr;
107 u32 osr;
108 u32 pad1;
109 u32 odqdpar;
110 u32 pad2;
111 u32 osar;
112 u32 odpr;
113 u32 odatr;
114 u32 odcr;
115 u32 pad3;
116 u32 odqepar;
117 u32 pad4[13];
118 u32 imr;
119 u32 isr;
120 u32 pad5;
121 u32 ifqdpar;
122 u32 pad6;
123 u32 ifqepar;
124 };
125
126 struct rio_dbell_regs {
127 u32 odmr;
128 u32 odsr;
129 u32 pad1[4];
130 u32 oddpr;
131 u32 oddatr;
132 u32 pad2[3];
133 u32 odretcr;
134 u32 pad3[12];
135 u32 dmr;
136 u32 dsr;
137 u32 pad4;
138 u32 dqdpar;
139 u32 pad5;
140 u32 dqepar;
141 };
142
143 struct rio_pw_regs {
144 u32 pwmr;
145 u32 pwsr;
146 u32 epwqbar;
147 u32 pwqbar;
148 };
149
150
151 struct rio_tx_desc {
152 u32 pad1;
153 u32 saddr;
154 u32 dport;
155 u32 dattr;
156 u32 pad2;
157 u32 pad3;
158 u32 dwcnt;
159 u32 pad4;
160 };
161
162 struct rio_msg_tx_ring {
163 void *virt;
164 dma_addr_t phys;
165 void *virt_buffer[RIO_MAX_TX_RING_SIZE];
166 dma_addr_t phys_buffer[RIO_MAX_TX_RING_SIZE];
167 int tx_slot;
168 int size;
169 void *dev_id;
170 };
171
172 struct rio_msg_rx_ring {
173 void *virt;
174 dma_addr_t phys;
175 void *virt_buffer[RIO_MAX_RX_RING_SIZE];
176 int rx_slot;
177 int size;
178 void *dev_id;
179 };
180
181 struct fsl_rmu {
182 struct rio_msg_regs __iomem *msg_regs;
183 struct rio_msg_tx_ring msg_tx_ring;
184 struct rio_msg_rx_ring msg_rx_ring;
185 int txirq;
186 int rxirq;
187 };
188
189 struct rio_dbell_msg {
190 u16 pad1;
191 u16 tid;
192 u16 sid;
193 u16 info;
194 };
195
196 /**
197 * fsl_rio_tx_handler - MPC85xx outbound message interrupt handler
198 * @irq: Linux interrupt number
199 * @dev_instance: Pointer to interrupt-specific data
200 *
201 * Handles outbound message interrupts. Executes a register outbound
202 * mailbox event handler and acks the interrupt occurrence.
203 */
204 static irqreturn_t
fsl_rio_tx_handler(int irq,void * dev_instance)205 fsl_rio_tx_handler(int irq, void *dev_instance)
206 {
207 int osr;
208 struct rio_mport *port = (struct rio_mport *)dev_instance;
209 struct fsl_rmu *rmu = GET_RMM_HANDLE(port);
210
211 osr = in_be32(&rmu->msg_regs->osr);
212
213 if (osr & RIO_MSG_OSR_TE) {
214 pr_info("RIO: outbound message transmission error\n");
215 out_be32(&rmu->msg_regs->osr, RIO_MSG_OSR_TE);
216 goto out;
217 }
218
219 if (osr & RIO_MSG_OSR_QOI) {
220 pr_info("RIO: outbound message queue overflow\n");
221 out_be32(&rmu->msg_regs->osr, RIO_MSG_OSR_QOI);
222 goto out;
223 }
224
225 if (osr & RIO_MSG_OSR_EOMI) {
226 u32 dqp = in_be32(&rmu->msg_regs->odqdpar);
227 int slot = (dqp - rmu->msg_tx_ring.phys) >> 5;
228 if (port->outb_msg[0].mcback != NULL) {
229 port->outb_msg[0].mcback(port, rmu->msg_tx_ring.dev_id,
230 -1,
231 slot);
232 }
233 /* Ack the end-of-message interrupt */
234 out_be32(&rmu->msg_regs->osr, RIO_MSG_OSR_EOMI);
235 }
236
237 out:
238 return IRQ_HANDLED;
239 }
240
241 /**
242 * fsl_rio_rx_handler - MPC85xx inbound message interrupt handler
243 * @irq: Linux interrupt number
244 * @dev_instance: Pointer to interrupt-specific data
245 *
246 * Handles inbound message interrupts. Executes a registered inbound
247 * mailbox event handler and acks the interrupt occurrence.
248 */
249 static irqreturn_t
fsl_rio_rx_handler(int irq,void * dev_instance)250 fsl_rio_rx_handler(int irq, void *dev_instance)
251 {
252 int isr;
253 struct rio_mport *port = (struct rio_mport *)dev_instance;
254 struct fsl_rmu *rmu = GET_RMM_HANDLE(port);
255
256 isr = in_be32(&rmu->msg_regs->isr);
257
258 if (isr & RIO_MSG_ISR_TE) {
259 pr_info("RIO: inbound message reception error\n");
260 out_be32((void *)&rmu->msg_regs->isr, RIO_MSG_ISR_TE);
261 goto out;
262 }
263
264 /* XXX Need to check/dispatch until queue empty */
265 if (isr & RIO_MSG_ISR_DIQI) {
266 /*
267 * Can receive messages for any mailbox/letter to that
268 * mailbox destination. So, make the callback with an
269 * unknown/invalid mailbox number argument.
270 */
271 if (port->inb_msg[0].mcback != NULL)
272 port->inb_msg[0].mcback(port, rmu->msg_rx_ring.dev_id,
273 -1,
274 -1);
275
276 /* Ack the queueing interrupt */
277 out_be32(&rmu->msg_regs->isr, RIO_MSG_ISR_DIQI);
278 }
279
280 out:
281 return IRQ_HANDLED;
282 }
283
284 /**
285 * fsl_rio_dbell_handler - MPC85xx doorbell interrupt handler
286 * @irq: Linux interrupt number
287 * @dev_instance: Pointer to interrupt-specific data
288 *
289 * Handles doorbell interrupts. Parses a list of registered
290 * doorbell event handlers and executes a matching event handler.
291 */
292 static irqreturn_t
fsl_rio_dbell_handler(int irq,void * dev_instance)293 fsl_rio_dbell_handler(int irq, void *dev_instance)
294 {
295 int dsr;
296 struct fsl_rio_dbell *fsl_dbell = (struct fsl_rio_dbell *)dev_instance;
297 int i;
298
299 dsr = in_be32(&fsl_dbell->dbell_regs->dsr);
300
301 if (dsr & DOORBELL_DSR_TE) {
302 pr_info("RIO: doorbell reception error\n");
303 out_be32(&fsl_dbell->dbell_regs->dsr, DOORBELL_DSR_TE);
304 goto out;
305 }
306
307 if (dsr & DOORBELL_DSR_QFI) {
308 pr_info("RIO: doorbell queue full\n");
309 out_be32(&fsl_dbell->dbell_regs->dsr, DOORBELL_DSR_QFI);
310 }
311
312 /* XXX Need to check/dispatch until queue empty */
313 if (dsr & DOORBELL_DSR_DIQI) {
314 struct rio_dbell_msg *dmsg =
315 fsl_dbell->dbell_ring.virt +
316 (in_be32(&fsl_dbell->dbell_regs->dqdpar) & 0xfff);
317 struct rio_dbell *dbell;
318 int found = 0;
319
320 pr_debug
321 ("RIO: processing doorbell,"
322 " sid %2.2x tid %2.2x info %4.4x\n",
323 dmsg->sid, dmsg->tid, dmsg->info);
324
325 for (i = 0; i < MAX_PORT_NUM; i++) {
326 if (fsl_dbell->mport[i]) {
327 list_for_each_entry(dbell,
328 &fsl_dbell->mport[i]->dbells, node) {
329 if ((dbell->res->start
330 <= dmsg->info)
331 && (dbell->res->end
332 >= dmsg->info)) {
333 found = 1;
334 break;
335 }
336 }
337 if (found && dbell->dinb) {
338 dbell->dinb(fsl_dbell->mport[i],
339 dbell->dev_id, dmsg->sid,
340 dmsg->tid,
341 dmsg->info);
342 break;
343 }
344 }
345 }
346
347 if (!found) {
348 pr_debug
349 ("RIO: spurious doorbell,"
350 " sid %2.2x tid %2.2x info %4.4x\n",
351 dmsg->sid, dmsg->tid,
352 dmsg->info);
353 }
354 setbits32(&fsl_dbell->dbell_regs->dmr, DOORBELL_DMR_DI);
355 out_be32(&fsl_dbell->dbell_regs->dsr, DOORBELL_DSR_DIQI);
356 }
357
358 out:
359 return IRQ_HANDLED;
360 }
361
msg_unit_error_handler(void)362 static void msg_unit_error_handler(void)
363 {
364
365 /*XXX: Error recovery is not implemented, we just clear errors */
366 out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR), 0);
367
368 out_be32((u32 *)(rmu_regs_win + RIO_IM0SR), IMSR_CLEAR);
369 out_be32((u32 *)(rmu_regs_win + RIO_IM1SR), IMSR_CLEAR);
370 out_be32((u32 *)(rmu_regs_win + RIO_OM0SR), OMSR_CLEAR);
371 out_be32((u32 *)(rmu_regs_win + RIO_OM1SR), OMSR_CLEAR);
372
373 out_be32(&dbell->dbell_regs->odsr, ODSR_CLEAR);
374 out_be32(&dbell->dbell_regs->dsr, IDSR_CLEAR);
375
376 out_be32(&pw->pw_regs->pwsr, IPWSR_CLEAR);
377 }
378
379 /**
380 * fsl_rio_port_write_handler - MPC85xx port write interrupt handler
381 * @irq: Linux interrupt number
382 * @dev_instance: Pointer to interrupt-specific data
383 *
384 * Handles port write interrupts. Parses a list of registered
385 * port write event handlers and executes a matching event handler.
386 */
387 static irqreturn_t
fsl_rio_port_write_handler(int irq,void * dev_instance)388 fsl_rio_port_write_handler(int irq, void *dev_instance)
389 {
390 u32 ipwmr, ipwsr;
391 struct fsl_rio_pw *pw = (struct fsl_rio_pw *)dev_instance;
392 u32 epwisr, tmp;
393
394 epwisr = in_be32(rio_regs_win + RIO_EPWISR);
395 if (!(epwisr & RIO_EPWISR_PW))
396 goto pw_done;
397
398 ipwmr = in_be32(&pw->pw_regs->pwmr);
399 ipwsr = in_be32(&pw->pw_regs->pwsr);
400
401 #ifdef DEBUG_PW
402 pr_debug("PW Int->IPWMR: 0x%08x IPWSR: 0x%08x (", ipwmr, ipwsr);
403 if (ipwsr & RIO_IPWSR_QF)
404 pr_debug(" QF");
405 if (ipwsr & RIO_IPWSR_TE)
406 pr_debug(" TE");
407 if (ipwsr & RIO_IPWSR_QFI)
408 pr_debug(" QFI");
409 if (ipwsr & RIO_IPWSR_PWD)
410 pr_debug(" PWD");
411 if (ipwsr & RIO_IPWSR_PWB)
412 pr_debug(" PWB");
413 pr_debug(" )\n");
414 #endif
415 /* Schedule deferred processing if PW was received */
416 if (ipwsr & RIO_IPWSR_QFI) {
417 /* Save PW message (if there is room in FIFO),
418 * otherwise discard it.
419 */
420 if (kfifo_avail(&pw->pw_fifo) >= RIO_PW_MSG_SIZE) {
421 pw->port_write_msg.msg_count++;
422 kfifo_in(&pw->pw_fifo, pw->port_write_msg.virt,
423 RIO_PW_MSG_SIZE);
424 } else {
425 pw->port_write_msg.discard_count++;
426 pr_debug("RIO: ISR Discarded Port-Write Msg(s) (%d)\n",
427 pw->port_write_msg.discard_count);
428 }
429 /* Clear interrupt and issue Clear Queue command. This allows
430 * another port-write to be received.
431 */
432 out_be32(&pw->pw_regs->pwsr, RIO_IPWSR_QFI);
433 out_be32(&pw->pw_regs->pwmr, ipwmr | RIO_IPWMR_CQ);
434
435 schedule_work(&pw->pw_work);
436 }
437
438 if ((ipwmr & RIO_IPWMR_EIE) && (ipwsr & RIO_IPWSR_TE)) {
439 pw->port_write_msg.err_count++;
440 pr_debug("RIO: Port-Write Transaction Err (%d)\n",
441 pw->port_write_msg.err_count);
442 /* Clear Transaction Error: port-write controller should be
443 * disabled when clearing this error
444 */
445 out_be32(&pw->pw_regs->pwmr, ipwmr & ~RIO_IPWMR_PWE);
446 out_be32(&pw->pw_regs->pwsr, RIO_IPWSR_TE);
447 out_be32(&pw->pw_regs->pwmr, ipwmr);
448 }
449
450 if (ipwsr & RIO_IPWSR_PWD) {
451 pw->port_write_msg.discard_count++;
452 pr_debug("RIO: Port Discarded Port-Write Msg(s) (%d)\n",
453 pw->port_write_msg.discard_count);
454 out_be32(&pw->pw_regs->pwsr, RIO_IPWSR_PWD);
455 }
456
457 pw_done:
458 if (epwisr & RIO_EPWISR_PINT1) {
459 tmp = in_be32(rio_regs_win + RIO_LTLEDCSR);
460 pr_debug("RIO_LTLEDCSR = 0x%x\n", tmp);
461 fsl_rio_port_error_handler(0);
462 }
463
464 if (epwisr & RIO_EPWISR_PINT2) {
465 tmp = in_be32(rio_regs_win + RIO_LTLEDCSR);
466 pr_debug("RIO_LTLEDCSR = 0x%x\n", tmp);
467 fsl_rio_port_error_handler(1);
468 }
469
470 if (epwisr & RIO_EPWISR_MU) {
471 tmp = in_be32(rio_regs_win + RIO_LTLEDCSR);
472 pr_debug("RIO_LTLEDCSR = 0x%x\n", tmp);
473 msg_unit_error_handler();
474 }
475
476 return IRQ_HANDLED;
477 }
478
fsl_pw_dpc(struct work_struct * work)479 static void fsl_pw_dpc(struct work_struct *work)
480 {
481 struct fsl_rio_pw *pw = container_of(work, struct fsl_rio_pw, pw_work);
482 union rio_pw_msg msg_buffer;
483 int i;
484
485 /*
486 * Process port-write messages
487 */
488 while (kfifo_out_spinlocked(&pw->pw_fifo, (unsigned char *)&msg_buffer,
489 RIO_PW_MSG_SIZE, &pw->pw_fifo_lock)) {
490 #ifdef DEBUG_PW
491 {
492 u32 i;
493 pr_debug("%s : Port-Write Message:", __func__);
494 for (i = 0; i < RIO_PW_MSG_SIZE/sizeof(u32); i++) {
495 if ((i%4) == 0)
496 pr_debug("\n0x%02x: 0x%08x", i*4,
497 msg_buffer.raw[i]);
498 else
499 pr_debug(" 0x%08x", msg_buffer.raw[i]);
500 }
501 pr_debug("\n");
502 }
503 #endif
504 /* Pass the port-write message to RIO core for processing */
505 for (i = 0; i < MAX_PORT_NUM; i++) {
506 if (pw->mport[i])
507 rio_inb_pwrite_handler(pw->mport[i],
508 &msg_buffer);
509 }
510 }
511 }
512
513 /**
514 * fsl_rio_pw_enable - enable/disable port-write interface init
515 * @mport: Master port implementing the port write unit
516 * @enable: 1=enable; 0=disable port-write message handling
517 */
fsl_rio_pw_enable(struct rio_mport * mport,int enable)518 int fsl_rio_pw_enable(struct rio_mport *mport, int enable)
519 {
520 u32 rval;
521
522 rval = in_be32(&pw->pw_regs->pwmr);
523
524 if (enable)
525 rval |= RIO_IPWMR_PWE;
526 else
527 rval &= ~RIO_IPWMR_PWE;
528
529 out_be32(&pw->pw_regs->pwmr, rval);
530
531 return 0;
532 }
533
534 /**
535 * fsl_rio_port_write_init - MPC85xx port write interface init
536 * @mport: Master port implementing the port write unit
537 *
538 * Initializes port write unit hardware and DMA buffer
539 * ring. Called from fsl_rio_setup(). Returns %0 on success
540 * or %-ENOMEM on failure.
541 */
542
fsl_rio_port_write_init(struct fsl_rio_pw * pw)543 int fsl_rio_port_write_init(struct fsl_rio_pw *pw)
544 {
545 int rc = 0;
546
547 /* Following configurations require a disabled port write controller */
548 out_be32(&pw->pw_regs->pwmr,
549 in_be32(&pw->pw_regs->pwmr) & ~RIO_IPWMR_PWE);
550
551 /* Initialize port write */
552 pw->port_write_msg.virt = dma_alloc_coherent(pw->dev,
553 RIO_PW_MSG_SIZE,
554 &pw->port_write_msg.phys, GFP_KERNEL);
555 if (!pw->port_write_msg.virt) {
556 pr_err("RIO: unable allocate port write queue\n");
557 return -ENOMEM;
558 }
559
560 pw->port_write_msg.err_count = 0;
561 pw->port_write_msg.discard_count = 0;
562
563 /* Point dequeue/enqueue pointers at first entry */
564 out_be32(&pw->pw_regs->epwqbar, 0);
565 out_be32(&pw->pw_regs->pwqbar, (u32) pw->port_write_msg.phys);
566
567 pr_debug("EIPWQBAR: 0x%08x IPWQBAR: 0x%08x\n",
568 in_be32(&pw->pw_regs->epwqbar),
569 in_be32(&pw->pw_regs->pwqbar));
570
571 /* Clear interrupt status IPWSR */
572 out_be32(&pw->pw_regs->pwsr,
573 (RIO_IPWSR_TE | RIO_IPWSR_QFI | RIO_IPWSR_PWD));
574
575 /* Configure port write controller for snooping enable all reporting,
576 clear queue full */
577 out_be32(&pw->pw_regs->pwmr,
578 RIO_IPWMR_SEN | RIO_IPWMR_QFIE | RIO_IPWMR_EIE | RIO_IPWMR_CQ);
579
580
581 /* Hook up port-write handler */
582 rc = request_irq(IRQ_RIO_PW(pw), fsl_rio_port_write_handler,
583 IRQF_SHARED, "port-write", (void *)pw);
584 if (rc < 0) {
585 pr_err("MPC85xx RIO: unable to request inbound doorbell irq");
586 goto err_out;
587 }
588 /* Enable Error Interrupt */
589 out_be32((u32 *)(rio_regs_win + RIO_LTLEECSR), LTLEECSR_ENABLE_ALL);
590
591 INIT_WORK(&pw->pw_work, fsl_pw_dpc);
592 spin_lock_init(&pw->pw_fifo_lock);
593 if (kfifo_alloc(&pw->pw_fifo, RIO_PW_MSG_SIZE * 32, GFP_KERNEL)) {
594 pr_err("FIFO allocation failed\n");
595 rc = -ENOMEM;
596 goto err_out_irq;
597 }
598
599 pr_debug("IPWMR: 0x%08x IPWSR: 0x%08x\n",
600 in_be32(&pw->pw_regs->pwmr),
601 in_be32(&pw->pw_regs->pwsr));
602
603 return rc;
604
605 err_out_irq:
606 free_irq(IRQ_RIO_PW(pw), (void *)pw);
607 err_out:
608 dma_free_coherent(pw->dev, RIO_PW_MSG_SIZE,
609 pw->port_write_msg.virt,
610 pw->port_write_msg.phys);
611 return rc;
612 }
613
614 /**
615 * fsl_rio_doorbell_send - Send a MPC85xx doorbell message
616 * @mport: RapidIO master port info
617 * @index: ID of RapidIO interface
618 * @destid: Destination ID of target device
619 * @data: 16-bit info field of RapidIO doorbell message
620 *
621 * Sends a MPC85xx doorbell message. Returns %0 on success or
622 * %-EINVAL on failure.
623 */
fsl_rio_doorbell_send(struct rio_mport * mport,int index,u16 destid,u16 data)624 int fsl_rio_doorbell_send(struct rio_mport *mport,
625 int index, u16 destid, u16 data)
626 {
627 unsigned long flags;
628
629 pr_debug("fsl_doorbell_send: index %d destid %4.4x data %4.4x\n",
630 index, destid, data);
631
632 spin_lock_irqsave(&fsl_rio_doorbell_lock, flags);
633
634 /* In the serial version silicons, such as MPC8548, MPC8641,
635 * below operations is must be.
636 */
637 out_be32(&dbell->dbell_regs->odmr, 0x00000000);
638 out_be32(&dbell->dbell_regs->odretcr, 0x00000004);
639 out_be32(&dbell->dbell_regs->oddpr, destid << 16);
640 out_be32(&dbell->dbell_regs->oddatr, (index << 20) | data);
641 out_be32(&dbell->dbell_regs->odmr, 0x00000001);
642
643 spin_unlock_irqrestore(&fsl_rio_doorbell_lock, flags);
644
645 return 0;
646 }
647
648 /**
649 * fsl_add_outb_message - Add message to the MPC85xx outbound message queue
650 * @mport: Master port with outbound message queue
651 * @rdev: Target of outbound message
652 * @mbox: Outbound mailbox
653 * @buffer: Message to add to outbound queue
654 * @len: Length of message
655 *
656 * Adds the @buffer message to the MPC85xx outbound message queue. Returns
657 * %0 on success or %-EINVAL on failure.
658 */
659 int
fsl_add_outb_message(struct rio_mport * mport,struct rio_dev * rdev,int mbox,void * buffer,size_t len)660 fsl_add_outb_message(struct rio_mport *mport, struct rio_dev *rdev, int mbox,
661 void *buffer, size_t len)
662 {
663 struct fsl_rmu *rmu = GET_RMM_HANDLE(mport);
664 u32 omr;
665 struct rio_tx_desc *desc = (struct rio_tx_desc *)rmu->msg_tx_ring.virt
666 + rmu->msg_tx_ring.tx_slot;
667 int ret = 0;
668
669 pr_debug("RIO: fsl_add_outb_message(): destid %4.4x mbox %d buffer " \
670 "%p len %8.8zx\n", rdev->destid, mbox, buffer, len);
671 if ((len < 8) || (len > RIO_MAX_MSG_SIZE)) {
672 ret = -EINVAL;
673 goto out;
674 }
675
676 /* Copy and clear rest of buffer */
677 memcpy(rmu->msg_tx_ring.virt_buffer[rmu->msg_tx_ring.tx_slot], buffer,
678 len);
679 if (len < (RIO_MAX_MSG_SIZE - 4))
680 memset(rmu->msg_tx_ring.virt_buffer[rmu->msg_tx_ring.tx_slot]
681 + len, 0, RIO_MAX_MSG_SIZE - len);
682
683 /* Set mbox field for message, and set destid */
684 desc->dport = (rdev->destid << 16) | (mbox & 0x3);
685
686 /* Enable EOMI interrupt and priority */
687 desc->dattr = 0x28000000 | ((mport->index) << 20);
688
689 /* Set transfer size aligned to next power of 2 (in double words) */
690 desc->dwcnt = is_power_of_2(len) ? len : 1 << get_bitmask_order(len);
691
692 /* Set snooping and source buffer address */
693 desc->saddr = 0x00000004
694 | rmu->msg_tx_ring.phys_buffer[rmu->msg_tx_ring.tx_slot];
695
696 /* Increment enqueue pointer */
697 omr = in_be32(&rmu->msg_regs->omr);
698 out_be32(&rmu->msg_regs->omr, omr | RIO_MSG_OMR_MUI);
699
700 /* Go to next descriptor */
701 if (++rmu->msg_tx_ring.tx_slot == rmu->msg_tx_ring.size)
702 rmu->msg_tx_ring.tx_slot = 0;
703
704 out:
705 return ret;
706 }
707
708 /**
709 * fsl_open_outb_mbox - Initialize MPC85xx outbound mailbox
710 * @mport: Master port implementing the outbound message unit
711 * @dev_id: Device specific pointer to pass on event
712 * @mbox: Mailbox to open
713 * @entries: Number of entries in the outbound mailbox ring
714 *
715 * Initializes buffer ring, request the outbound message interrupt,
716 * and enables the outbound message unit. Returns %0 on success and
717 * %-EINVAL or %-ENOMEM on failure.
718 */
719 int
fsl_open_outb_mbox(struct rio_mport * mport,void * dev_id,int mbox,int entries)720 fsl_open_outb_mbox(struct rio_mport *mport, void *dev_id, int mbox, int entries)
721 {
722 int i, j, rc = 0;
723 struct rio_priv *priv = mport->priv;
724 struct fsl_rmu *rmu = GET_RMM_HANDLE(mport);
725
726 if ((entries < RIO_MIN_TX_RING_SIZE) ||
727 (entries > RIO_MAX_TX_RING_SIZE) || (!is_power_of_2(entries))) {
728 rc = -EINVAL;
729 goto out;
730 }
731
732 /* Initialize shadow copy ring */
733 rmu->msg_tx_ring.dev_id = dev_id;
734 rmu->msg_tx_ring.size = entries;
735
736 for (i = 0; i < rmu->msg_tx_ring.size; i++) {
737 rmu->msg_tx_ring.virt_buffer[i] =
738 dma_alloc_coherent(priv->dev, RIO_MSG_BUFFER_SIZE,
739 &rmu->msg_tx_ring.phys_buffer[i], GFP_KERNEL);
740 if (!rmu->msg_tx_ring.virt_buffer[i]) {
741 rc = -ENOMEM;
742 for (j = 0; j < rmu->msg_tx_ring.size; j++)
743 if (rmu->msg_tx_ring.virt_buffer[j])
744 dma_free_coherent(priv->dev,
745 RIO_MSG_BUFFER_SIZE,
746 rmu->msg_tx_ring.
747 virt_buffer[j],
748 rmu->msg_tx_ring.
749 phys_buffer[j]);
750 goto out;
751 }
752 }
753
754 /* Initialize outbound message descriptor ring */
755 rmu->msg_tx_ring.virt = dma_alloc_coherent(priv->dev,
756 rmu->msg_tx_ring.size * RIO_MSG_DESC_SIZE,
757 &rmu->msg_tx_ring.phys,
758 GFP_KERNEL);
759 if (!rmu->msg_tx_ring.virt) {
760 rc = -ENOMEM;
761 goto out_dma;
762 }
763 rmu->msg_tx_ring.tx_slot = 0;
764
765 /* Point dequeue/enqueue pointers at first entry in ring */
766 out_be32(&rmu->msg_regs->odqdpar, rmu->msg_tx_ring.phys);
767 out_be32(&rmu->msg_regs->odqepar, rmu->msg_tx_ring.phys);
768
769 /* Configure for snooping */
770 out_be32(&rmu->msg_regs->osar, 0x00000004);
771
772 /* Clear interrupt status */
773 out_be32(&rmu->msg_regs->osr, 0x000000b3);
774
775 /* Hook up outbound message handler */
776 rc = request_irq(IRQ_RIO_TX(mport), fsl_rio_tx_handler, 0,
777 "msg_tx", (void *)mport);
778 if (rc < 0)
779 goto out_irq;
780
781 /*
782 * Configure outbound message unit
783 * Snooping
784 * Interrupts (all enabled, except QEIE)
785 * Chaining mode
786 * Disable
787 */
788 out_be32(&rmu->msg_regs->omr, 0x00100220);
789
790 /* Set number of entries */
791 out_be32(&rmu->msg_regs->omr,
792 in_be32(&rmu->msg_regs->omr) |
793 ((get_bitmask_order(entries) - 2) << 12));
794
795 /* Now enable the unit */
796 out_be32(&rmu->msg_regs->omr, in_be32(&rmu->msg_regs->omr) | 0x1);
797
798 out:
799 return rc;
800
801 out_irq:
802 dma_free_coherent(priv->dev,
803 rmu->msg_tx_ring.size * RIO_MSG_DESC_SIZE,
804 rmu->msg_tx_ring.virt, rmu->msg_tx_ring.phys);
805
806 out_dma:
807 for (i = 0; i < rmu->msg_tx_ring.size; i++)
808 dma_free_coherent(priv->dev, RIO_MSG_BUFFER_SIZE,
809 rmu->msg_tx_ring.virt_buffer[i],
810 rmu->msg_tx_ring.phys_buffer[i]);
811
812 return rc;
813 }
814
815 /**
816 * fsl_close_outb_mbox - Shut down MPC85xx outbound mailbox
817 * @mport: Master port implementing the outbound message unit
818 * @mbox: Mailbox to close
819 *
820 * Disables the outbound message unit, free all buffers, and
821 * frees the outbound message interrupt.
822 */
fsl_close_outb_mbox(struct rio_mport * mport,int mbox)823 void fsl_close_outb_mbox(struct rio_mport *mport, int mbox)
824 {
825 struct rio_priv *priv = mport->priv;
826 struct fsl_rmu *rmu = GET_RMM_HANDLE(mport);
827
828 /* Disable inbound message unit */
829 out_be32(&rmu->msg_regs->omr, 0);
830
831 /* Free ring */
832 dma_free_coherent(priv->dev,
833 rmu->msg_tx_ring.size * RIO_MSG_DESC_SIZE,
834 rmu->msg_tx_ring.virt, rmu->msg_tx_ring.phys);
835
836 /* Free interrupt */
837 free_irq(IRQ_RIO_TX(mport), (void *)mport);
838 }
839
840 /**
841 * fsl_open_inb_mbox - Initialize MPC85xx inbound mailbox
842 * @mport: Master port implementing the inbound message unit
843 * @dev_id: Device specific pointer to pass on event
844 * @mbox: Mailbox to open
845 * @entries: Number of entries in the inbound mailbox ring
846 *
847 * Initializes buffer ring, request the inbound message interrupt,
848 * and enables the inbound message unit. Returns %0 on success
849 * and %-EINVAL or %-ENOMEM on failure.
850 */
851 int
fsl_open_inb_mbox(struct rio_mport * mport,void * dev_id,int mbox,int entries)852 fsl_open_inb_mbox(struct rio_mport *mport, void *dev_id, int mbox, int entries)
853 {
854 int i, rc = 0;
855 struct rio_priv *priv = mport->priv;
856 struct fsl_rmu *rmu = GET_RMM_HANDLE(mport);
857
858 if ((entries < RIO_MIN_RX_RING_SIZE) ||
859 (entries > RIO_MAX_RX_RING_SIZE) || (!is_power_of_2(entries))) {
860 rc = -EINVAL;
861 goto out;
862 }
863
864 /* Initialize client buffer ring */
865 rmu->msg_rx_ring.dev_id = dev_id;
866 rmu->msg_rx_ring.size = entries;
867 rmu->msg_rx_ring.rx_slot = 0;
868 for (i = 0; i < rmu->msg_rx_ring.size; i++)
869 rmu->msg_rx_ring.virt_buffer[i] = NULL;
870
871 /* Initialize inbound message ring */
872 rmu->msg_rx_ring.virt = dma_alloc_coherent(priv->dev,
873 rmu->msg_rx_ring.size * RIO_MAX_MSG_SIZE,
874 &rmu->msg_rx_ring.phys, GFP_KERNEL);
875 if (!rmu->msg_rx_ring.virt) {
876 rc = -ENOMEM;
877 goto out;
878 }
879
880 /* Point dequeue/enqueue pointers at first entry in ring */
881 out_be32(&rmu->msg_regs->ifqdpar, (u32) rmu->msg_rx_ring.phys);
882 out_be32(&rmu->msg_regs->ifqepar, (u32) rmu->msg_rx_ring.phys);
883
884 /* Clear interrupt status */
885 out_be32(&rmu->msg_regs->isr, 0x00000091);
886
887 /* Hook up inbound message handler */
888 rc = request_irq(IRQ_RIO_RX(mport), fsl_rio_rx_handler, 0,
889 "msg_rx", (void *)mport);
890 if (rc < 0) {
891 dma_free_coherent(priv->dev,
892 rmu->msg_rx_ring.size * RIO_MAX_MSG_SIZE,
893 rmu->msg_rx_ring.virt, rmu->msg_rx_ring.phys);
894 goto out;
895 }
896
897 /*
898 * Configure inbound message unit:
899 * Snooping
900 * 4KB max message size
901 * Unmask all interrupt sources
902 * Disable
903 */
904 out_be32(&rmu->msg_regs->imr, 0x001b0060);
905
906 /* Set number of queue entries */
907 setbits32(&rmu->msg_regs->imr, (get_bitmask_order(entries) - 2) << 12);
908
909 /* Now enable the unit */
910 setbits32(&rmu->msg_regs->imr, 0x1);
911
912 out:
913 return rc;
914 }
915
916 /**
917 * fsl_close_inb_mbox - Shut down MPC85xx inbound mailbox
918 * @mport: Master port implementing the inbound message unit
919 * @mbox: Mailbox to close
920 *
921 * Disables the inbound message unit, free all buffers, and
922 * frees the inbound message interrupt.
923 */
fsl_close_inb_mbox(struct rio_mport * mport,int mbox)924 void fsl_close_inb_mbox(struct rio_mport *mport, int mbox)
925 {
926 struct rio_priv *priv = mport->priv;
927 struct fsl_rmu *rmu = GET_RMM_HANDLE(mport);
928
929 /* Disable inbound message unit */
930 out_be32(&rmu->msg_regs->imr, 0);
931
932 /* Free ring */
933 dma_free_coherent(priv->dev, rmu->msg_rx_ring.size * RIO_MAX_MSG_SIZE,
934 rmu->msg_rx_ring.virt, rmu->msg_rx_ring.phys);
935
936 /* Free interrupt */
937 free_irq(IRQ_RIO_RX(mport), (void *)mport);
938 }
939
940 /**
941 * fsl_add_inb_buffer - Add buffer to the MPC85xx inbound message queue
942 * @mport: Master port implementing the inbound message unit
943 * @mbox: Inbound mailbox number
944 * @buf: Buffer to add to inbound queue
945 *
946 * Adds the @buf buffer to the MPC85xx inbound message queue. Returns
947 * %0 on success or %-EINVAL on failure.
948 */
fsl_add_inb_buffer(struct rio_mport * mport,int mbox,void * buf)949 int fsl_add_inb_buffer(struct rio_mport *mport, int mbox, void *buf)
950 {
951 int rc = 0;
952 struct fsl_rmu *rmu = GET_RMM_HANDLE(mport);
953
954 pr_debug("RIO: fsl_add_inb_buffer(), msg_rx_ring.rx_slot %d\n",
955 rmu->msg_rx_ring.rx_slot);
956
957 if (rmu->msg_rx_ring.virt_buffer[rmu->msg_rx_ring.rx_slot]) {
958 printk(KERN_ERR
959 "RIO: error adding inbound buffer %d, buffer exists\n",
960 rmu->msg_rx_ring.rx_slot);
961 rc = -EINVAL;
962 goto out;
963 }
964
965 rmu->msg_rx_ring.virt_buffer[rmu->msg_rx_ring.rx_slot] = buf;
966 if (++rmu->msg_rx_ring.rx_slot == rmu->msg_rx_ring.size)
967 rmu->msg_rx_ring.rx_slot = 0;
968
969 out:
970 return rc;
971 }
972
973 /**
974 * fsl_get_inb_message - Fetch inbound message from the MPC85xx message unit
975 * @mport: Master port implementing the inbound message unit
976 * @mbox: Inbound mailbox number
977 *
978 * Gets the next available inbound message from the inbound message queue.
979 * A pointer to the message is returned on success or NULL on failure.
980 */
fsl_get_inb_message(struct rio_mport * mport,int mbox)981 void *fsl_get_inb_message(struct rio_mport *mport, int mbox)
982 {
983 struct fsl_rmu *rmu = GET_RMM_HANDLE(mport);
984 u32 phys_buf;
985 void *virt_buf;
986 void *buf = NULL;
987 int buf_idx;
988
989 phys_buf = in_be32(&rmu->msg_regs->ifqdpar);
990
991 /* If no more messages, then bail out */
992 if (phys_buf == in_be32(&rmu->msg_regs->ifqepar))
993 goto out2;
994
995 virt_buf = rmu->msg_rx_ring.virt + (phys_buf
996 - rmu->msg_rx_ring.phys);
997 buf_idx = (phys_buf - rmu->msg_rx_ring.phys) / RIO_MAX_MSG_SIZE;
998 buf = rmu->msg_rx_ring.virt_buffer[buf_idx];
999
1000 if (!buf) {
1001 printk(KERN_ERR
1002 "RIO: inbound message copy failed, no buffers\n");
1003 goto out1;
1004 }
1005
1006 /* Copy max message size, caller is expected to allocate that big */
1007 memcpy(buf, virt_buf, RIO_MAX_MSG_SIZE);
1008
1009 /* Clear the available buffer */
1010 rmu->msg_rx_ring.virt_buffer[buf_idx] = NULL;
1011
1012 out1:
1013 setbits32(&rmu->msg_regs->imr, RIO_MSG_IMR_MI);
1014
1015 out2:
1016 return buf;
1017 }
1018
1019 /**
1020 * fsl_rio_doorbell_init - MPC85xx doorbell interface init
1021 * @mport: Master port implementing the inbound doorbell unit
1022 *
1023 * Initializes doorbell unit hardware and inbound DMA buffer
1024 * ring. Called from fsl_rio_setup(). Returns %0 on success
1025 * or %-ENOMEM on failure.
1026 */
fsl_rio_doorbell_init(struct fsl_rio_dbell * dbell)1027 int fsl_rio_doorbell_init(struct fsl_rio_dbell *dbell)
1028 {
1029 int rc = 0;
1030
1031 /* Initialize inbound doorbells */
1032 dbell->dbell_ring.virt = dma_alloc_coherent(dbell->dev, 512 *
1033 DOORBELL_MESSAGE_SIZE, &dbell->dbell_ring.phys, GFP_KERNEL);
1034 if (!dbell->dbell_ring.virt) {
1035 printk(KERN_ERR "RIO: unable allocate inbound doorbell ring\n");
1036 rc = -ENOMEM;
1037 goto out;
1038 }
1039
1040 /* Point dequeue/enqueue pointers at first entry in ring */
1041 out_be32(&dbell->dbell_regs->dqdpar, (u32) dbell->dbell_ring.phys);
1042 out_be32(&dbell->dbell_regs->dqepar, (u32) dbell->dbell_ring.phys);
1043
1044 /* Clear interrupt status */
1045 out_be32(&dbell->dbell_regs->dsr, 0x00000091);
1046
1047 /* Hook up doorbell handler */
1048 rc = request_irq(IRQ_RIO_BELL(dbell), fsl_rio_dbell_handler, 0,
1049 "dbell_rx", (void *)dbell);
1050 if (rc < 0) {
1051 dma_free_coherent(dbell->dev, 512 * DOORBELL_MESSAGE_SIZE,
1052 dbell->dbell_ring.virt, dbell->dbell_ring.phys);
1053 printk(KERN_ERR
1054 "MPC85xx RIO: unable to request inbound doorbell irq");
1055 goto out;
1056 }
1057
1058 /* Configure doorbells for snooping, 512 entries, and enable */
1059 out_be32(&dbell->dbell_regs->dmr, 0x00108161);
1060
1061 out:
1062 return rc;
1063 }
1064
fsl_rio_setup_rmu(struct rio_mport * mport,struct device_node * node)1065 int fsl_rio_setup_rmu(struct rio_mport *mport, struct device_node *node)
1066 {
1067 struct rio_priv *priv;
1068 struct fsl_rmu *rmu;
1069 u64 msg_start;
1070
1071 if (!mport || !mport->priv)
1072 return -EINVAL;
1073
1074 priv = mport->priv;
1075
1076 if (!node) {
1077 dev_warn(priv->dev, "Can't get %pOF property 'fsl,rmu'\n",
1078 priv->dev->of_node);
1079 return -EINVAL;
1080 }
1081
1082 rmu = kzalloc(sizeof(struct fsl_rmu), GFP_KERNEL);
1083 if (!rmu)
1084 return -ENOMEM;
1085
1086 if (of_property_read_reg(node, 0, &msg_start, NULL)) {
1087 pr_err("%pOF: unable to find 'reg' property of message-unit\n",
1088 node);
1089 kfree(rmu);
1090 return -ENOMEM;
1091 }
1092 rmu->msg_regs = (struct rio_msg_regs *)
1093 (rmu_regs_win + (u32)msg_start);
1094
1095 rmu->txirq = irq_of_parse_and_map(node, 0);
1096 rmu->rxirq = irq_of_parse_and_map(node, 1);
1097 printk(KERN_INFO "%pOF: txirq: %d, rxirq %d\n",
1098 node, rmu->txirq, rmu->rxirq);
1099
1100 priv->rmm_handle = rmu;
1101
1102 rio_init_dbell_res(&mport->riores[RIO_DOORBELL_RESOURCE], 0, 0xffff);
1103 rio_init_mbox_res(&mport->riores[RIO_INB_MBOX_RESOURCE], 0, 0);
1104 rio_init_mbox_res(&mport->riores[RIO_OUTB_MBOX_RESOURCE], 0, 0);
1105
1106 return 0;
1107 }
1108