1 /*
2 * Driver for the Octeon bootbus compact flash.
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 2005 - 2012 Cavium Inc.
9 * Copyright (C) 2008 Wind River Systems
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/libata.h>
15 #include <linux/hrtimer.h>
16 #include <linux/slab.h>
17 #include <linux/irq.h>
18 #include <linux/of.h>
19 #include <linux/of_address.h>
20 #include <linux/of_platform.h>
21 #include <linux/platform_device.h>
22 #include <scsi/scsi_host.h>
23 #include <trace/events/libata.h>
24 #include <asm/byteorder.h>
25 #include <asm/octeon/octeon.h>
26
27 /*
28 * The Octeon bootbus compact flash interface is connected in at least
29 * 3 different configurations on various evaluation boards:
30 *
31 * -- 8 bits no irq, no DMA
32 * -- 16 bits no irq, no DMA
33 * -- 16 bits True IDE mode with DMA, but no irq.
34 *
35 * In the last case the DMA engine can generate an interrupt when the
36 * transfer is complete. For the first two cases only PIO is supported.
37 *
38 */
39
40 #define DRV_NAME "pata_octeon_cf"
41 #define DRV_VERSION "2.2"
42
43 /* Poll interval in nS. */
44 #define OCTEON_CF_BUSY_POLL_INTERVAL 500000
45
46 #define DMA_CFG 0
47 #define DMA_TIM 0x20
48 #define DMA_INT 0x38
49 #define DMA_INT_EN 0x50
50
51 struct octeon_cf_port {
52 struct hrtimer delayed_finish;
53 struct ata_port *ap;
54 int dma_finished;
55 void *c0;
56 unsigned int cs0;
57 unsigned int cs1;
58 bool is_true_ide;
59 u64 dma_base;
60 };
61
62 static const struct scsi_host_template octeon_cf_sht = {
63 ATA_PIO_SHT(DRV_NAME),
64 };
65
66 static int enable_dma;
67 module_param(enable_dma, int, 0444);
68 MODULE_PARM_DESC(enable_dma,
69 "Enable use of DMA on interfaces that support it (0=no dma [default], 1=use dma)");
70
71 /*
72 * Convert nanosecond based time to setting used in the
73 * boot bus timing register, based on timing multiple
74 */
ns_to_tim_reg(unsigned int tim_mult,unsigned int nsecs)75 static unsigned int ns_to_tim_reg(unsigned int tim_mult, unsigned int nsecs)
76 {
77 /*
78 * Compute # of eclock periods to get desired duration in
79 * nanoseconds.
80 */
81 return DIV_ROUND_UP(nsecs * (octeon_get_io_clock_rate() / 1000000),
82 1000 * tim_mult);
83 }
84
octeon_cf_set_boot_reg_cfg(int cs,unsigned int multiplier)85 static void octeon_cf_set_boot_reg_cfg(int cs, unsigned int multiplier)
86 {
87 union cvmx_mio_boot_reg_cfgx reg_cfg;
88 unsigned int tim_mult;
89
90 switch (multiplier) {
91 case 8:
92 tim_mult = 3;
93 break;
94 case 4:
95 tim_mult = 0;
96 break;
97 case 2:
98 tim_mult = 2;
99 break;
100 default:
101 tim_mult = 1;
102 break;
103 }
104
105 reg_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(cs));
106 reg_cfg.s.dmack = 0; /* Don't assert DMACK on access */
107 reg_cfg.s.tim_mult = tim_mult; /* Timing mutiplier */
108 reg_cfg.s.rd_dly = 0; /* Sample on falling edge of BOOT_OE */
109 reg_cfg.s.sam = 0; /* Don't combine write and output enable */
110 reg_cfg.s.we_ext = 0; /* No write enable extension */
111 reg_cfg.s.oe_ext = 0; /* No read enable extension */
112 reg_cfg.s.en = 1; /* Enable this region */
113 reg_cfg.s.orbit = 0; /* Don't combine with previous region */
114 reg_cfg.s.ale = 0; /* Don't do address multiplexing */
115 cvmx_write_csr(CVMX_MIO_BOOT_REG_CFGX(cs), reg_cfg.u64);
116 }
117
118 /*
119 * Called after libata determines the needed PIO mode. This
120 * function programs the Octeon bootbus regions to support the
121 * timing requirements of the PIO mode.
122 *
123 * @ap: ATA port information
124 * @dev: ATA device
125 */
octeon_cf_set_piomode(struct ata_port * ap,struct ata_device * dev)126 static void octeon_cf_set_piomode(struct ata_port *ap, struct ata_device *dev)
127 {
128 struct octeon_cf_port *cf_port = ap->private_data;
129 union cvmx_mio_boot_reg_timx reg_tim;
130 int T;
131 struct ata_timing timing;
132
133 unsigned int div;
134 int use_iordy;
135 int trh;
136 int pause;
137 /* These names are timing parameters from the ATA spec */
138 int t2;
139
140 /*
141 * A divisor value of four will overflow the timing fields at
142 * clock rates greater than 800MHz
143 */
144 if (octeon_get_io_clock_rate() <= 800000000)
145 div = 4;
146 else
147 div = 8;
148 T = (int)((1000000000000LL * div) / octeon_get_io_clock_rate());
149
150 BUG_ON(ata_timing_compute(dev, dev->pio_mode, &timing, T, T));
151
152 t2 = timing.active;
153 if (t2)
154 t2--;
155
156 trh = ns_to_tim_reg(div, 20);
157 if (trh)
158 trh--;
159
160 pause = (int)timing.cycle - (int)timing.active -
161 (int)timing.setup - trh;
162 if (pause < 0)
163 pause = 0;
164 if (pause)
165 pause--;
166
167 octeon_cf_set_boot_reg_cfg(cf_port->cs0, div);
168 if (cf_port->is_true_ide)
169 /* True IDE mode, program both chip selects. */
170 octeon_cf_set_boot_reg_cfg(cf_port->cs1, div);
171
172
173 use_iordy = ata_pio_need_iordy(dev);
174
175 reg_tim.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_TIMX(cf_port->cs0));
176 /* Disable page mode */
177 reg_tim.s.pagem = 0;
178 /* Enable dynamic timing */
179 reg_tim.s.waitm = use_iordy;
180 /* Pages are disabled */
181 reg_tim.s.pages = 0;
182 /* We don't use multiplexed address mode */
183 reg_tim.s.ale = 0;
184 /* Not used */
185 reg_tim.s.page = 0;
186 /* Time after IORDY to continue to assert the data */
187 reg_tim.s.wait = 0;
188 /* Time to wait to complete the cycle. */
189 reg_tim.s.pause = pause;
190 /* How long to hold after a write to de-assert CE. */
191 reg_tim.s.wr_hld = trh;
192 /* How long to wait after a read to de-assert CE. */
193 reg_tim.s.rd_hld = trh;
194 /* How long write enable is asserted */
195 reg_tim.s.we = t2;
196 /* How long read enable is asserted */
197 reg_tim.s.oe = t2;
198 /* Time after CE that read/write starts */
199 reg_tim.s.ce = ns_to_tim_reg(div, 5);
200 /* Time before CE that address is valid */
201 reg_tim.s.adr = 0;
202
203 /* Program the bootbus region timing for the data port chip select. */
204 cvmx_write_csr(CVMX_MIO_BOOT_REG_TIMX(cf_port->cs0), reg_tim.u64);
205 if (cf_port->is_true_ide)
206 /* True IDE mode, program both chip selects. */
207 cvmx_write_csr(CVMX_MIO_BOOT_REG_TIMX(cf_port->cs1),
208 reg_tim.u64);
209 }
210
octeon_cf_set_dmamode(struct ata_port * ap,struct ata_device * dev)211 static void octeon_cf_set_dmamode(struct ata_port *ap, struct ata_device *dev)
212 {
213 struct octeon_cf_port *cf_port = ap->private_data;
214 union cvmx_mio_boot_pin_defs pin_defs;
215 union cvmx_mio_boot_dma_timx dma_tim;
216 unsigned int oe_a;
217 unsigned int oe_n;
218 unsigned int dma_ackh;
219 unsigned int dma_arq;
220 unsigned int pause;
221 unsigned int T0, Tkr, Td;
222 unsigned int tim_mult;
223 int c;
224
225 const struct ata_timing *timing;
226
227 timing = ata_timing_find_mode(dev->dma_mode);
228 T0 = timing->cycle;
229 Td = timing->active;
230 Tkr = timing->recover;
231 dma_ackh = timing->dmack_hold;
232
233 dma_tim.u64 = 0;
234 /* dma_tim.s.tim_mult = 0 --> 4x */
235 tim_mult = 4;
236
237 /* not spec'ed, value in eclocks, not affected by tim_mult */
238 dma_arq = 8;
239 pause = 25 - dma_arq * 1000 /
240 (octeon_get_io_clock_rate() / 1000000); /* Tz */
241
242 oe_a = Td;
243 /* Tkr from cf spec, lengthened to meet T0 */
244 oe_n = max(T0 - oe_a, Tkr);
245
246 pin_defs.u64 = cvmx_read_csr(CVMX_MIO_BOOT_PIN_DEFS);
247
248 /* DMA channel number. */
249 c = (cf_port->dma_base & 8) >> 3;
250
251 /* Invert the polarity if the default is 0*/
252 dma_tim.s.dmack_pi = (pin_defs.u64 & (1ull << (11 + c))) ? 0 : 1;
253
254 dma_tim.s.oe_n = ns_to_tim_reg(tim_mult, oe_n);
255 dma_tim.s.oe_a = ns_to_tim_reg(tim_mult, oe_a);
256
257 /*
258 * This is tI, C.F. spec. says 0, but Sony CF card requires
259 * more, we use 20 nS.
260 */
261 dma_tim.s.dmack_s = ns_to_tim_reg(tim_mult, 20);
262 dma_tim.s.dmack_h = ns_to_tim_reg(tim_mult, dma_ackh);
263
264 dma_tim.s.dmarq = dma_arq;
265 dma_tim.s.pause = ns_to_tim_reg(tim_mult, pause);
266
267 dma_tim.s.rd_dly = 0; /* Sample right on edge */
268
269 /* writes only */
270 dma_tim.s.we_n = ns_to_tim_reg(tim_mult, oe_n);
271 dma_tim.s.we_a = ns_to_tim_reg(tim_mult, oe_a);
272
273 ata_dev_dbg(dev, "ns to ticks (mult %d) of %d is: %d\n", tim_mult, 60,
274 ns_to_tim_reg(tim_mult, 60));
275 ata_dev_dbg(dev, "oe_n: %d, oe_a: %d, dmack_s: %d, dmack_h: %d, dmarq: %d, pause: %d\n",
276 dma_tim.s.oe_n, dma_tim.s.oe_a, dma_tim.s.dmack_s,
277 dma_tim.s.dmack_h, dma_tim.s.dmarq, dma_tim.s.pause);
278
279 cvmx_write_csr(cf_port->dma_base + DMA_TIM, dma_tim.u64);
280 }
281
282 /*
283 * Handle an 8 bit I/O request.
284 *
285 * @qc: Queued command
286 * @buffer: Data buffer
287 * @buflen: Length of the buffer.
288 * @rw: True to write.
289 */
octeon_cf_data_xfer8(struct ata_queued_cmd * qc,unsigned char * buffer,unsigned int buflen,int rw)290 static unsigned int octeon_cf_data_xfer8(struct ata_queued_cmd *qc,
291 unsigned char *buffer,
292 unsigned int buflen,
293 int rw)
294 {
295 struct ata_port *ap = qc->dev->link->ap;
296 void __iomem *data_addr = ap->ioaddr.data_addr;
297 unsigned long words;
298 int count;
299
300 words = buflen;
301 if (rw) {
302 count = 16;
303 while (words--) {
304 iowrite8(*buffer, data_addr);
305 buffer++;
306 /*
307 * Every 16 writes do a read so the bootbus
308 * FIFO doesn't fill up.
309 */
310 if (--count == 0) {
311 ioread8(ap->ioaddr.altstatus_addr);
312 count = 16;
313 }
314 }
315 } else {
316 ioread8_rep(data_addr, buffer, words);
317 }
318 return buflen;
319 }
320
321 /*
322 * Handle a 16 bit I/O request.
323 *
324 * @qc: Queued command
325 * @buffer: Data buffer
326 * @buflen: Length of the buffer.
327 * @rw: True to write.
328 */
octeon_cf_data_xfer16(struct ata_queued_cmd * qc,unsigned char * buffer,unsigned int buflen,int rw)329 static unsigned int octeon_cf_data_xfer16(struct ata_queued_cmd *qc,
330 unsigned char *buffer,
331 unsigned int buflen,
332 int rw)
333 {
334 struct ata_port *ap = qc->dev->link->ap;
335 void __iomem *data_addr = ap->ioaddr.data_addr;
336 unsigned long words;
337 int count;
338
339 words = buflen / 2;
340 if (rw) {
341 count = 16;
342 while (words--) {
343 iowrite16(*(uint16_t *)buffer, data_addr);
344 buffer += sizeof(uint16_t);
345 /*
346 * Every 16 writes do a read so the bootbus
347 * FIFO doesn't fill up.
348 */
349 if (--count == 0) {
350 ioread8(ap->ioaddr.altstatus_addr);
351 count = 16;
352 }
353 }
354 } else {
355 while (words--) {
356 *(uint16_t *)buffer = ioread16(data_addr);
357 buffer += sizeof(uint16_t);
358 }
359 }
360 /* Transfer trailing 1 byte, if any. */
361 if (unlikely(buflen & 0x01)) {
362 __le16 align_buf[1] = { 0 };
363
364 if (rw == READ) {
365 align_buf[0] = cpu_to_le16(ioread16(data_addr));
366 memcpy(buffer, align_buf, 1);
367 } else {
368 memcpy(align_buf, buffer, 1);
369 iowrite16(le16_to_cpu(align_buf[0]), data_addr);
370 }
371 words++;
372 }
373 return buflen;
374 }
375
376 /*
377 * Read the taskfile for 16bit non-True IDE only.
378 */
octeon_cf_tf_read16(struct ata_port * ap,struct ata_taskfile * tf)379 static void octeon_cf_tf_read16(struct ata_port *ap, struct ata_taskfile *tf)
380 {
381 u16 blob;
382 /* The base of the registers is at ioaddr.data_addr. */
383 void __iomem *base = ap->ioaddr.data_addr;
384
385 blob = __raw_readw(base + 0xc);
386 tf->error = blob >> 8;
387
388 blob = __raw_readw(base + 2);
389 tf->nsect = blob & 0xff;
390 tf->lbal = blob >> 8;
391
392 blob = __raw_readw(base + 4);
393 tf->lbam = blob & 0xff;
394 tf->lbah = blob >> 8;
395
396 blob = __raw_readw(base + 6);
397 tf->device = blob & 0xff;
398 tf->status = blob >> 8;
399
400 if (tf->flags & ATA_TFLAG_LBA48) {
401 if (likely(ap->ioaddr.ctl_addr)) {
402 iowrite8(tf->ctl | ATA_HOB, ap->ioaddr.ctl_addr);
403
404 blob = __raw_readw(base + 0xc);
405 tf->hob_feature = blob >> 8;
406
407 blob = __raw_readw(base + 2);
408 tf->hob_nsect = blob & 0xff;
409 tf->hob_lbal = blob >> 8;
410
411 blob = __raw_readw(base + 4);
412 tf->hob_lbam = blob & 0xff;
413 tf->hob_lbah = blob >> 8;
414
415 iowrite8(tf->ctl, ap->ioaddr.ctl_addr);
416 ap->last_ctl = tf->ctl;
417 } else {
418 WARN_ON(1);
419 }
420 }
421 }
422
octeon_cf_check_status16(struct ata_port * ap)423 static u8 octeon_cf_check_status16(struct ata_port *ap)
424 {
425 u16 blob;
426 void __iomem *base = ap->ioaddr.data_addr;
427
428 blob = __raw_readw(base + 6);
429 return blob >> 8;
430 }
431
octeon_cf_softreset16(struct ata_link * link,unsigned int * classes,unsigned long deadline)432 static int octeon_cf_softreset16(struct ata_link *link, unsigned int *classes,
433 unsigned long deadline)
434 {
435 struct ata_port *ap = link->ap;
436 void __iomem *base = ap->ioaddr.data_addr;
437 int rc;
438 u8 err;
439
440 __raw_writew(ap->ctl, base + 0xe);
441 udelay(20);
442 __raw_writew(ap->ctl | ATA_SRST, base + 0xe);
443 udelay(20);
444 __raw_writew(ap->ctl, base + 0xe);
445
446 rc = ata_sff_wait_after_reset(link, 1, deadline);
447 if (rc) {
448 ata_link_err(link, "SRST failed (errno=%d)\n", rc);
449 return rc;
450 }
451
452 /* determine by signature whether we have ATA or ATAPI devices */
453 classes[0] = ata_sff_dev_classify(&link->device[0], 1, &err);
454 return 0;
455 }
456
457 /*
458 * Load the taskfile for 16bit non-True IDE only. The device_addr is
459 * not loaded, we do this as part of octeon_cf_exec_command16.
460 */
octeon_cf_tf_load16(struct ata_port * ap,const struct ata_taskfile * tf)461 static void octeon_cf_tf_load16(struct ata_port *ap,
462 const struct ata_taskfile *tf)
463 {
464 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
465 /* The base of the registers is at ioaddr.data_addr. */
466 void __iomem *base = ap->ioaddr.data_addr;
467
468 if (tf->ctl != ap->last_ctl) {
469 iowrite8(tf->ctl, ap->ioaddr.ctl_addr);
470 ap->last_ctl = tf->ctl;
471 ata_wait_idle(ap);
472 }
473 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
474 __raw_writew(tf->hob_feature << 8, base + 0xc);
475 __raw_writew(tf->hob_nsect | tf->hob_lbal << 8, base + 2);
476 __raw_writew(tf->hob_lbam | tf->hob_lbah << 8, base + 4);
477 }
478 if (is_addr) {
479 __raw_writew(tf->feature << 8, base + 0xc);
480 __raw_writew(tf->nsect | tf->lbal << 8, base + 2);
481 __raw_writew(tf->lbam | tf->lbah << 8, base + 4);
482 }
483 ata_wait_idle(ap);
484 }
485
486
octeon_cf_dev_select(struct ata_port * ap,unsigned int device)487 static void octeon_cf_dev_select(struct ata_port *ap, unsigned int device)
488 {
489 /* There is only one device, do nothing. */
490 return;
491 }
492
493 /*
494 * Issue ATA command to host controller. The device_addr is also sent
495 * as it must be written in a combined write with the command.
496 */
octeon_cf_exec_command16(struct ata_port * ap,const struct ata_taskfile * tf)497 static void octeon_cf_exec_command16(struct ata_port *ap,
498 const struct ata_taskfile *tf)
499 {
500 /* The base of the registers is at ioaddr.data_addr. */
501 void __iomem *base = ap->ioaddr.data_addr;
502 u16 blob = 0;
503
504 if (tf->flags & ATA_TFLAG_DEVICE)
505 blob = tf->device;
506
507 blob |= (tf->command << 8);
508 __raw_writew(blob, base + 6);
509
510 ata_wait_idle(ap);
511 }
512
octeon_cf_ata_port_noaction(struct ata_port * ap)513 static void octeon_cf_ata_port_noaction(struct ata_port *ap)
514 {
515 }
516
octeon_cf_dma_setup(struct ata_queued_cmd * qc)517 static void octeon_cf_dma_setup(struct ata_queued_cmd *qc)
518 {
519 struct ata_port *ap = qc->ap;
520 struct octeon_cf_port *cf_port;
521
522 cf_port = ap->private_data;
523 /* issue r/w command */
524 qc->cursg = qc->sg;
525 cf_port->dma_finished = 0;
526 ap->ops->sff_exec_command(ap, &qc->tf);
527 }
528
529 /*
530 * Start a DMA transfer that was already setup
531 *
532 * @qc: Information about the DMA
533 */
octeon_cf_dma_start(struct ata_queued_cmd * qc)534 static void octeon_cf_dma_start(struct ata_queued_cmd *qc)
535 {
536 struct octeon_cf_port *cf_port = qc->ap->private_data;
537 union cvmx_mio_boot_dma_cfgx mio_boot_dma_cfg;
538 union cvmx_mio_boot_dma_intx mio_boot_dma_int;
539 struct scatterlist *sg;
540
541 /* Get the scatter list entry we need to DMA into */
542 sg = qc->cursg;
543 BUG_ON(!sg);
544
545 /*
546 * Clear the DMA complete status.
547 */
548 mio_boot_dma_int.u64 = 0;
549 mio_boot_dma_int.s.done = 1;
550 cvmx_write_csr(cf_port->dma_base + DMA_INT, mio_boot_dma_int.u64);
551
552 /* Enable the interrupt. */
553 cvmx_write_csr(cf_port->dma_base + DMA_INT_EN, mio_boot_dma_int.u64);
554
555 /* Set the direction of the DMA */
556 mio_boot_dma_cfg.u64 = 0;
557 #ifdef __LITTLE_ENDIAN
558 mio_boot_dma_cfg.s.endian = 1;
559 #endif
560 mio_boot_dma_cfg.s.en = 1;
561 mio_boot_dma_cfg.s.rw = ((qc->tf.flags & ATA_TFLAG_WRITE) != 0);
562
563 /*
564 * Don't stop the DMA if the device deasserts DMARQ. Many
565 * compact flashes deassert DMARQ for a short time between
566 * sectors. Instead of stopping and restarting the DMA, we'll
567 * let the hardware do it. If the DMA is really stopped early
568 * due to an error condition, a later timeout will force us to
569 * stop.
570 */
571 mio_boot_dma_cfg.s.clr = 0;
572
573 /* Size is specified in 16bit words and minus one notation */
574 mio_boot_dma_cfg.s.size = sg_dma_len(sg) / 2 - 1;
575
576 /* We need to swap the high and low bytes of every 16 bits */
577 mio_boot_dma_cfg.s.swap8 = 1;
578
579 mio_boot_dma_cfg.s.adr = sg_dma_address(sg);
580
581 cvmx_write_csr(cf_port->dma_base + DMA_CFG, mio_boot_dma_cfg.u64);
582 }
583
584 /*
585 *
586 * LOCKING:
587 * spin_lock_irqsave(host lock)
588 *
589 */
octeon_cf_dma_finished(struct ata_port * ap,struct ata_queued_cmd * qc)590 static unsigned int octeon_cf_dma_finished(struct ata_port *ap,
591 struct ata_queued_cmd *qc)
592 {
593 struct ata_eh_info *ehi = &ap->link.eh_info;
594 struct octeon_cf_port *cf_port = ap->private_data;
595 union cvmx_mio_boot_dma_cfgx dma_cfg;
596 union cvmx_mio_boot_dma_intx dma_int;
597 u8 status;
598
599 trace_ata_bmdma_stop(ap, &qc->tf, qc->tag);
600
601 if (ap->hsm_task_state != HSM_ST_LAST)
602 return 0;
603
604 dma_cfg.u64 = cvmx_read_csr(cf_port->dma_base + DMA_CFG);
605 if (dma_cfg.s.size != 0xfffff) {
606 /* Error, the transfer was not complete. */
607 qc->err_mask |= AC_ERR_HOST_BUS;
608 ap->hsm_task_state = HSM_ST_ERR;
609 }
610
611 /* Stop and clear the dma engine. */
612 dma_cfg.u64 = 0;
613 dma_cfg.s.size = -1;
614 cvmx_write_csr(cf_port->dma_base + DMA_CFG, dma_cfg.u64);
615
616 /* Disable the interrupt. */
617 dma_int.u64 = 0;
618 cvmx_write_csr(cf_port->dma_base + DMA_INT_EN, dma_int.u64);
619
620 /* Clear the DMA complete status */
621 dma_int.s.done = 1;
622 cvmx_write_csr(cf_port->dma_base + DMA_INT, dma_int.u64);
623
624 status = ap->ops->sff_check_status(ap);
625
626 ata_sff_hsm_move(ap, qc, status, 0);
627
628 if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA))
629 ata_ehi_push_desc(ehi, "DMA stat 0x%x", status);
630
631 return 1;
632 }
633
634 /*
635 * Check if any queued commands have more DMAs, if so start the next
636 * transfer, else do end of transfer handling.
637 */
octeon_cf_interrupt(int irq,void * dev_instance)638 static irqreturn_t octeon_cf_interrupt(int irq, void *dev_instance)
639 {
640 struct ata_host *host = dev_instance;
641 struct octeon_cf_port *cf_port;
642 int i;
643 unsigned int handled = 0;
644 unsigned long flags;
645
646 spin_lock_irqsave(&host->lock, flags);
647
648 for (i = 0; i < host->n_ports; i++) {
649 u8 status;
650 struct ata_port *ap;
651 struct ata_queued_cmd *qc;
652 union cvmx_mio_boot_dma_intx dma_int;
653 union cvmx_mio_boot_dma_cfgx dma_cfg;
654
655 ap = host->ports[i];
656 cf_port = ap->private_data;
657
658 dma_int.u64 = cvmx_read_csr(cf_port->dma_base + DMA_INT);
659 dma_cfg.u64 = cvmx_read_csr(cf_port->dma_base + DMA_CFG);
660
661 qc = ata_qc_from_tag(ap, ap->link.active_tag);
662
663 if (!qc || (qc->tf.flags & ATA_TFLAG_POLLING))
664 continue;
665
666 if (dma_int.s.done && !dma_cfg.s.en) {
667 if (!sg_is_last(qc->cursg)) {
668 qc->cursg = sg_next(qc->cursg);
669 handled = 1;
670 trace_ata_bmdma_start(ap, &qc->tf, qc->tag);
671 octeon_cf_dma_start(qc);
672 continue;
673 } else {
674 cf_port->dma_finished = 1;
675 }
676 }
677 if (!cf_port->dma_finished)
678 continue;
679 status = ioread8(ap->ioaddr.altstatus_addr);
680 if (status & (ATA_BUSY | ATA_DRQ)) {
681 /*
682 * We are busy, try to handle it later. This
683 * is the DMA finished interrupt, and it could
684 * take a little while for the card to be
685 * ready for more commands.
686 */
687 /* Clear DMA irq. */
688 dma_int.u64 = 0;
689 dma_int.s.done = 1;
690 cvmx_write_csr(cf_port->dma_base + DMA_INT,
691 dma_int.u64);
692 hrtimer_start_range_ns(&cf_port->delayed_finish,
693 ns_to_ktime(OCTEON_CF_BUSY_POLL_INTERVAL),
694 OCTEON_CF_BUSY_POLL_INTERVAL / 5,
695 HRTIMER_MODE_REL);
696 handled = 1;
697 } else {
698 handled |= octeon_cf_dma_finished(ap, qc);
699 }
700 }
701 spin_unlock_irqrestore(&host->lock, flags);
702 return IRQ_RETVAL(handled);
703 }
704
octeon_cf_delayed_finish(struct hrtimer * hrt)705 static enum hrtimer_restart octeon_cf_delayed_finish(struct hrtimer *hrt)
706 {
707 struct octeon_cf_port *cf_port = container_of(hrt,
708 struct octeon_cf_port,
709 delayed_finish);
710 struct ata_port *ap = cf_port->ap;
711 struct ata_host *host = ap->host;
712 struct ata_queued_cmd *qc;
713 unsigned long flags;
714 u8 status;
715 enum hrtimer_restart rv = HRTIMER_NORESTART;
716
717 spin_lock_irqsave(&host->lock, flags);
718
719 /*
720 * If the port is not waiting for completion, it must have
721 * handled it previously. The hsm_task_state is
722 * protected by host->lock.
723 */
724 if (ap->hsm_task_state != HSM_ST_LAST || !cf_port->dma_finished)
725 goto out;
726
727 status = ioread8(ap->ioaddr.altstatus_addr);
728 if (status & (ATA_BUSY | ATA_DRQ)) {
729 /* Still busy, try again. */
730 hrtimer_forward_now(hrt,
731 ns_to_ktime(OCTEON_CF_BUSY_POLL_INTERVAL));
732 rv = HRTIMER_RESTART;
733 goto out;
734 }
735 qc = ata_qc_from_tag(ap, ap->link.active_tag);
736 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
737 octeon_cf_dma_finished(ap, qc);
738 out:
739 spin_unlock_irqrestore(&host->lock, flags);
740 return rv;
741 }
742
octeon_cf_dev_config(struct ata_device * dev)743 static void octeon_cf_dev_config(struct ata_device *dev)
744 {
745 /*
746 * A maximum of 2^20 - 1 16 bit transfers are possible with
747 * the bootbus DMA. So we need to throttle max_sectors to
748 * (2^12 - 1 == 4095) to assure that this can never happen.
749 */
750 dev->max_sectors = min(dev->max_sectors, 4095U);
751 }
752
753 /*
754 * We don't do ATAPI DMA so return 0.
755 */
octeon_cf_check_atapi_dma(struct ata_queued_cmd * qc)756 static int octeon_cf_check_atapi_dma(struct ata_queued_cmd *qc)
757 {
758 return 0;
759 }
760
octeon_cf_qc_issue(struct ata_queued_cmd * qc)761 static unsigned int octeon_cf_qc_issue(struct ata_queued_cmd *qc)
762 {
763 struct ata_port *ap = qc->ap;
764
765 switch (qc->tf.protocol) {
766 case ATA_PROT_DMA:
767 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
768
769 trace_ata_tf_load(ap, &qc->tf);
770 ap->ops->sff_tf_load(ap, &qc->tf); /* load tf registers */
771 trace_ata_bmdma_setup(ap, &qc->tf, qc->tag);
772 octeon_cf_dma_setup(qc); /* set up dma */
773 trace_ata_bmdma_start(ap, &qc->tf, qc->tag);
774 octeon_cf_dma_start(qc); /* initiate dma */
775 ap->hsm_task_state = HSM_ST_LAST;
776 break;
777
778 case ATAPI_PROT_DMA:
779 dev_err(ap->dev, "Error, ATAPI not supported\n");
780 BUG();
781
782 default:
783 return ata_sff_qc_issue(qc);
784 }
785
786 return 0;
787 }
788
789 static struct ata_port_operations octeon_cf_ops = {
790 .inherits = &ata_sff_port_ops,
791 .check_atapi_dma = octeon_cf_check_atapi_dma,
792 .qc_issue = octeon_cf_qc_issue,
793 .sff_dev_select = octeon_cf_dev_select,
794 .sff_irq_on = octeon_cf_ata_port_noaction,
795 .sff_irq_clear = octeon_cf_ata_port_noaction,
796 .cable_detect = ata_cable_40wire,
797 .set_piomode = octeon_cf_set_piomode,
798 .set_dmamode = octeon_cf_set_dmamode,
799 .dev_config = octeon_cf_dev_config,
800 };
801
octeon_cf_probe(struct platform_device * pdev)802 static int octeon_cf_probe(struct platform_device *pdev)
803 {
804 struct resource *res_cs0, *res_cs1;
805
806 bool is_16bit;
807 u64 reg;
808 struct device_node *node;
809 void __iomem *cs0;
810 void __iomem *cs1 = NULL;
811 struct ata_host *host;
812 struct ata_port *ap;
813 int irq = 0;
814 irq_handler_t irq_handler = NULL;
815 void __iomem *base;
816 struct octeon_cf_port *cf_port;
817 u32 bus_width;
818 int rv;
819
820 node = pdev->dev.of_node;
821 if (node == NULL)
822 return -EINVAL;
823
824 cf_port = devm_kzalloc(&pdev->dev, sizeof(*cf_port), GFP_KERNEL);
825 if (!cf_port)
826 return -ENOMEM;
827
828 cf_port->is_true_ide = of_property_read_bool(node, "cavium,true-ide");
829
830 if (of_property_read_u32(node, "cavium,bus-width", &bus_width) == 0)
831 is_16bit = (bus_width == 16);
832 else
833 is_16bit = false;
834
835 rv = of_property_read_reg(node, 0, ®, NULL);
836 if (rv < 0)
837 return rv;
838 cf_port->cs0 = upper_32_bits(reg);
839
840 if (cf_port->is_true_ide) {
841 struct device_node *dma_node;
842 dma_node = of_parse_phandle(node,
843 "cavium,dma-engine-handle", 0);
844 if (dma_node) {
845 struct platform_device *dma_dev;
846 dma_dev = of_find_device_by_node(dma_node);
847 if (dma_dev) {
848 struct resource *res_dma;
849 int i;
850 res_dma = platform_get_resource(dma_dev, IORESOURCE_MEM, 0);
851 if (!res_dma) {
852 put_device(&dma_dev->dev);
853 of_node_put(dma_node);
854 return -EINVAL;
855 }
856 cf_port->dma_base = (u64)devm_ioremap(&pdev->dev, res_dma->start,
857 resource_size(res_dma));
858 if (!cf_port->dma_base) {
859 put_device(&dma_dev->dev);
860 of_node_put(dma_node);
861 return -EINVAL;
862 }
863
864 i = platform_get_irq(dma_dev, 0);
865 if (i > 0) {
866 irq = i;
867 irq_handler = octeon_cf_interrupt;
868 }
869 put_device(&dma_dev->dev);
870 }
871 of_node_put(dma_node);
872 }
873 res_cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
874 if (!res_cs1)
875 return -EINVAL;
876
877 cs1 = devm_ioremap(&pdev->dev, res_cs1->start,
878 resource_size(res_cs1));
879 if (!cs1)
880 return -EINVAL;
881
882 rv = of_property_read_reg(node, 1, ®, NULL);
883 if (rv < 0)
884 return rv;
885 cf_port->cs1 = upper_32_bits(reg);
886 }
887
888 res_cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
889 if (!res_cs0)
890 return -EINVAL;
891
892 cs0 = devm_ioremap(&pdev->dev, res_cs0->start,
893 resource_size(res_cs0));
894 if (!cs0)
895 return -ENOMEM;
896
897 /* allocate host */
898 host = ata_host_alloc(&pdev->dev, 1);
899 if (!host)
900 return -ENOMEM;
901
902 ap = host->ports[0];
903 ap->private_data = cf_port;
904 pdev->dev.platform_data = cf_port;
905 cf_port->ap = ap;
906 ap->ops = &octeon_cf_ops;
907 ap->pio_mask = ATA_PIO6;
908 ap->flags |= ATA_FLAG_NO_ATAPI | ATA_FLAG_PIO_POLLING;
909
910 if (!is_16bit) {
911 base = cs0 + 0x800;
912 ap->ioaddr.cmd_addr = base;
913 ata_sff_std_ports(&ap->ioaddr);
914
915 ap->ioaddr.altstatus_addr = base + 0xe;
916 ap->ioaddr.ctl_addr = base + 0xe;
917 octeon_cf_ops.sff_data_xfer = octeon_cf_data_xfer8;
918 } else if (cf_port->is_true_ide) {
919 base = cs0;
920 ap->ioaddr.cmd_addr = base + (ATA_REG_CMD << 1) + 1;
921 ap->ioaddr.data_addr = base + (ATA_REG_DATA << 1);
922 ap->ioaddr.error_addr = base + (ATA_REG_ERR << 1) + 1;
923 ap->ioaddr.feature_addr = base + (ATA_REG_FEATURE << 1) + 1;
924 ap->ioaddr.nsect_addr = base + (ATA_REG_NSECT << 1) + 1;
925 ap->ioaddr.lbal_addr = base + (ATA_REG_LBAL << 1) + 1;
926 ap->ioaddr.lbam_addr = base + (ATA_REG_LBAM << 1) + 1;
927 ap->ioaddr.lbah_addr = base + (ATA_REG_LBAH << 1) + 1;
928 ap->ioaddr.device_addr = base + (ATA_REG_DEVICE << 1) + 1;
929 ap->ioaddr.status_addr = base + (ATA_REG_STATUS << 1) + 1;
930 ap->ioaddr.command_addr = base + (ATA_REG_CMD << 1) + 1;
931 ap->ioaddr.altstatus_addr = cs1 + (6 << 1) + 1;
932 ap->ioaddr.ctl_addr = cs1 + (6 << 1) + 1;
933 octeon_cf_ops.sff_data_xfer = octeon_cf_data_xfer16;
934
935 ap->mwdma_mask = enable_dma ? ATA_MWDMA4 : 0;
936
937 /* True IDE mode needs a timer to poll for not-busy. */
938 hrtimer_init(&cf_port->delayed_finish, CLOCK_MONOTONIC,
939 HRTIMER_MODE_REL);
940 cf_port->delayed_finish.function = octeon_cf_delayed_finish;
941 } else {
942 /* 16 bit but not True IDE */
943 base = cs0 + 0x800;
944 octeon_cf_ops.sff_data_xfer = octeon_cf_data_xfer16;
945 octeon_cf_ops.softreset = octeon_cf_softreset16;
946 octeon_cf_ops.sff_check_status = octeon_cf_check_status16;
947 octeon_cf_ops.sff_tf_read = octeon_cf_tf_read16;
948 octeon_cf_ops.sff_tf_load = octeon_cf_tf_load16;
949 octeon_cf_ops.sff_exec_command = octeon_cf_exec_command16;
950
951 ap->ioaddr.data_addr = base + ATA_REG_DATA;
952 ap->ioaddr.nsect_addr = base + ATA_REG_NSECT;
953 ap->ioaddr.lbal_addr = base + ATA_REG_LBAL;
954 ap->ioaddr.ctl_addr = base + 0xe;
955 ap->ioaddr.altstatus_addr = base + 0xe;
956 }
957 cf_port->c0 = ap->ioaddr.ctl_addr;
958
959 rv = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
960 if (rv)
961 return rv;
962
963 ata_port_desc(ap, "cmd %p ctl %p", base, ap->ioaddr.ctl_addr);
964
965 dev_info(&pdev->dev, "version " DRV_VERSION" %d bit%s.\n",
966 is_16bit ? 16 : 8,
967 cf_port->is_true_ide ? ", True IDE" : "");
968
969 return ata_host_activate(host, irq, irq_handler,
970 IRQF_SHARED, &octeon_cf_sht);
971 }
972
octeon_cf_shutdown(struct device * dev)973 static void octeon_cf_shutdown(struct device *dev)
974 {
975 union cvmx_mio_boot_dma_cfgx dma_cfg;
976 union cvmx_mio_boot_dma_intx dma_int;
977
978 struct octeon_cf_port *cf_port = dev_get_platdata(dev);
979
980 if (cf_port->dma_base) {
981 /* Stop and clear the dma engine. */
982 dma_cfg.u64 = 0;
983 dma_cfg.s.size = -1;
984 cvmx_write_csr(cf_port->dma_base + DMA_CFG, dma_cfg.u64);
985
986 /* Disable the interrupt. */
987 dma_int.u64 = 0;
988 cvmx_write_csr(cf_port->dma_base + DMA_INT_EN, dma_int.u64);
989
990 /* Clear the DMA complete status */
991 dma_int.s.done = 1;
992 cvmx_write_csr(cf_port->dma_base + DMA_INT, dma_int.u64);
993
994 __raw_writeb(0, cf_port->c0);
995 udelay(20);
996 __raw_writeb(ATA_SRST, cf_port->c0);
997 udelay(20);
998 __raw_writeb(0, cf_port->c0);
999 mdelay(100);
1000 }
1001 }
1002
1003 static const struct of_device_id octeon_cf_match[] = {
1004 { .compatible = "cavium,ebt3000-compact-flash", },
1005 { /* sentinel */ }
1006 };
1007 MODULE_DEVICE_TABLE(of, octeon_cf_match);
1008
1009 static struct platform_driver octeon_cf_driver = {
1010 .probe = octeon_cf_probe,
1011 .driver = {
1012 .name = DRV_NAME,
1013 .of_match_table = octeon_cf_match,
1014 .shutdown = octeon_cf_shutdown
1015 },
1016 };
1017
octeon_cf_init(void)1018 static int __init octeon_cf_init(void)
1019 {
1020 return platform_driver_register(&octeon_cf_driver);
1021 }
1022
1023
1024 MODULE_AUTHOR("David Daney <ddaney@caviumnetworks.com>");
1025 MODULE_DESCRIPTION("low-level driver for Cavium OCTEON Compact Flash PATA");
1026 MODULE_LICENSE("GPL");
1027 MODULE_VERSION(DRV_VERSION);
1028 MODULE_ALIAS("platform:" DRV_NAME);
1029
1030 module_init(octeon_cf_init);
1031