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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * pdc_adma.c - Pacific Digital Corporation ADMA
4 *
5 * Maintained by: Tejun Heo <tj@kernel.org>
6 *
7 * Copyright 2005 Mark Lord
8 *
9 * libata documentation is available via 'make {ps|pdf}docs',
10 * as Documentation/driver-api/libata.rst
11 *
12 * Supports ATA disks in single-packet ADMA mode.
13 * Uses PIO for everything else.
14 *
15 * TODO: Use ADMA transfers for ATAPI devices, when possible.
16 * This requires careful attention to a number of quirks of the chip.
17 */
18
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/gfp.h>
22#include <linux/pci.h>
23#include <linux/blkdev.h>
24#include <linux/delay.h>
25#include <linux/interrupt.h>
26#include <linux/device.h>
27#include <scsi/scsi_host.h>
28#include <linux/libata.h>
29
30#define DRV_NAME "pdc_adma"
31#define DRV_VERSION "1.0"
32
33/* macro to calculate base address for ATA regs */
34#define ADMA_ATA_REGS(base, port_no) ((base) + ((port_no) * 0x40))
35
36/* macro to calculate base address for ADMA regs */
37#define ADMA_REGS(base, port_no) ((base) + 0x80 + ((port_no) * 0x20))
38
39/* macro to obtain addresses from ata_port */
40#define ADMA_PORT_REGS(ap) \
41 ADMA_REGS((ap)->host->iomap[ADMA_MMIO_BAR], ap->port_no)
42
43enum {
44 ADMA_MMIO_BAR = 4,
45
46 ADMA_PORTS = 2,
47 ADMA_CPB_BYTES = 40,
48 ADMA_PRD_BYTES = LIBATA_MAX_PRD * 16,
49 ADMA_PKT_BYTES = ADMA_CPB_BYTES + ADMA_PRD_BYTES,
50
51 ADMA_DMA_BOUNDARY = 0xffffffff,
52
53 /* global register offsets */
54 ADMA_MODE_LOCK = 0x00c7,
55
56 /* per-channel register offsets */
57 ADMA_CONTROL = 0x0000, /* ADMA control */
58 ADMA_STATUS = 0x0002, /* ADMA status */
59 ADMA_CPB_COUNT = 0x0004, /* CPB count */
60 ADMA_CPB_CURRENT = 0x000c, /* current CPB address */
61 ADMA_CPB_NEXT = 0x000c, /* next CPB address */
62 ADMA_CPB_LOOKUP = 0x0010, /* CPB lookup table */
63 ADMA_FIFO_IN = 0x0014, /* input FIFO threshold */
64 ADMA_FIFO_OUT = 0x0016, /* output FIFO threshold */
65
66 /* ADMA_CONTROL register bits */
67 aNIEN = (1 << 8), /* irq mask: 1==masked */
68 aGO = (1 << 7), /* packet trigger ("Go!") */
69 aRSTADM = (1 << 5), /* ADMA logic reset */
70 aPIOMD4 = 0x0003, /* PIO mode 4 */
71
72 /* ADMA_STATUS register bits */
73 aPSD = (1 << 6),
74 aUIRQ = (1 << 4),
75 aPERR = (1 << 0),
76
77 /* CPB bits */
78 cDONE = (1 << 0),
79 cATERR = (1 << 3),
80
81 cVLD = (1 << 0),
82 cDAT = (1 << 2),
83 cIEN = (1 << 3),
84
85 /* PRD bits */
86 pORD = (1 << 4),
87 pDIRO = (1 << 5),
88 pEND = (1 << 7),
89
90 /* ATA register flags */
91 rIGN = (1 << 5),
92 rEND = (1 << 7),
93
94 /* ATA register addresses */
95 ADMA_REGS_CONTROL = 0x0e,
96 ADMA_REGS_SECTOR_COUNT = 0x12,
97 ADMA_REGS_LBA_LOW = 0x13,
98 ADMA_REGS_LBA_MID = 0x14,
99 ADMA_REGS_LBA_HIGH = 0x15,
100 ADMA_REGS_DEVICE = 0x16,
101 ADMA_REGS_COMMAND = 0x17,
102
103 /* PCI device IDs */
104 board_1841_idx = 0, /* ADMA 2-port controller */
105};
106
107typedef enum { adma_state_idle, adma_state_pkt, adma_state_mmio } adma_state_t;
108
109struct adma_port_priv {
110 u8 *pkt;
111 dma_addr_t pkt_dma;
112 adma_state_t state;
113};
114
115static int adma_ata_init_one(struct pci_dev *pdev,
116 const struct pci_device_id *ent);
117static int adma_port_start(struct ata_port *ap);
118static void adma_port_stop(struct ata_port *ap);
119static enum ata_completion_errors adma_qc_prep(struct ata_queued_cmd *qc);
120static unsigned int adma_qc_issue(struct ata_queued_cmd *qc);
121static int adma_check_atapi_dma(struct ata_queued_cmd *qc);
122static void adma_freeze(struct ata_port *ap);
123static void adma_thaw(struct ata_port *ap);
124static int adma_prereset(struct ata_link *link, unsigned long deadline);
125
126static const struct scsi_host_template adma_ata_sht = {
127 ATA_BASE_SHT(DRV_NAME),
128 .sg_tablesize = LIBATA_MAX_PRD,
129 .dma_boundary = ADMA_DMA_BOUNDARY,
130};
131
132static struct ata_port_operations adma_ata_ops = {
133 .inherits = &ata_sff_port_ops,
134
135 .lost_interrupt = ATA_OP_NULL,
136
137 .check_atapi_dma = adma_check_atapi_dma,
138 .qc_prep = adma_qc_prep,
139 .qc_issue = adma_qc_issue,
140
141 .freeze = adma_freeze,
142 .thaw = adma_thaw,
143 .prereset = adma_prereset,
144
145 .port_start = adma_port_start,
146 .port_stop = adma_port_stop,
147};
148
149static struct ata_port_info adma_port_info[] = {
150 /* board_1841_idx */
151 {
152 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_POLLING,
153 .pio_mask = ATA_PIO4_ONLY,
154 .udma_mask = ATA_UDMA4,
155 .port_ops = &adma_ata_ops,
156 },
157};
158
159static const struct pci_device_id adma_ata_pci_tbl[] = {
160 { PCI_VDEVICE(PDC, 0x1841), board_1841_idx },
161
162 { } /* terminate list */
163};
164
165static struct pci_driver adma_ata_pci_driver = {
166 .name = DRV_NAME,
167 .id_table = adma_ata_pci_tbl,
168 .probe = adma_ata_init_one,
169 .remove = ata_pci_remove_one,
170};
171
172static int adma_check_atapi_dma(struct ata_queued_cmd *qc)
173{
174 return 1; /* ATAPI DMA not yet supported */
175}
176
177static void adma_reset_engine(struct ata_port *ap)
178{
179 void __iomem *chan = ADMA_PORT_REGS(ap);
180
181 /* reset ADMA to idle state */
182 writew(aPIOMD4 | aNIEN | aRSTADM, chan + ADMA_CONTROL);
183 udelay(2);
184 writew(aPIOMD4, chan + ADMA_CONTROL);
185 udelay(2);
186}
187
188static void adma_reinit_engine(struct ata_port *ap)
189{
190 struct adma_port_priv *pp = ap->private_data;
191 void __iomem *chan = ADMA_PORT_REGS(ap);
192
193 /* mask/clear ATA interrupts */
194 writeb(ATA_NIEN, ap->ioaddr.ctl_addr);
195 ata_sff_check_status(ap);
196
197 /* reset the ADMA engine */
198 adma_reset_engine(ap);
199
200 /* set in-FIFO threshold to 0x100 */
201 writew(0x100, chan + ADMA_FIFO_IN);
202
203 /* set CPB pointer */
204 writel((u32)pp->pkt_dma, chan + ADMA_CPB_NEXT);
205
206 /* set out-FIFO threshold to 0x100 */
207 writew(0x100, chan + ADMA_FIFO_OUT);
208
209 /* set CPB count */
210 writew(1, chan + ADMA_CPB_COUNT);
211
212 /* read/discard ADMA status */
213 readb(chan + ADMA_STATUS);
214}
215
216static inline void adma_enter_reg_mode(struct ata_port *ap)
217{
218 void __iomem *chan = ADMA_PORT_REGS(ap);
219
220 writew(aPIOMD4, chan + ADMA_CONTROL);
221 readb(chan + ADMA_STATUS); /* flush */
222}
223
224static void adma_freeze(struct ata_port *ap)
225{
226 void __iomem *chan = ADMA_PORT_REGS(ap);
227
228 /* mask/clear ATA interrupts */
229 writeb(ATA_NIEN, ap->ioaddr.ctl_addr);
230 ata_sff_check_status(ap);
231
232 /* reset ADMA to idle state */
233 writew(aPIOMD4 | aNIEN | aRSTADM, chan + ADMA_CONTROL);
234 udelay(2);
235 writew(aPIOMD4 | aNIEN, chan + ADMA_CONTROL);
236 udelay(2);
237}
238
239static void adma_thaw(struct ata_port *ap)
240{
241 adma_reinit_engine(ap);
242}
243
244static int adma_prereset(struct ata_link *link, unsigned long deadline)
245{
246 struct ata_port *ap = link->ap;
247 struct adma_port_priv *pp = ap->private_data;
248
249 if (pp->state != adma_state_idle) /* healthy paranoia */
250 pp->state = adma_state_mmio;
251 adma_reinit_engine(ap);
252
253 return ata_sff_prereset(link, deadline);
254}
255
256static int adma_fill_sg(struct ata_queued_cmd *qc)
257{
258 struct scatterlist *sg;
259 struct ata_port *ap = qc->ap;
260 struct adma_port_priv *pp = ap->private_data;
261 u8 *buf = pp->pkt, *last_buf = NULL;
262 int i = (2 + buf[3]) * 8;
263 u8 pFLAGS = pORD | ((qc->tf.flags & ATA_TFLAG_WRITE) ? pDIRO : 0);
264 unsigned int si;
265
266 for_each_sg(qc->sg, sg, qc->n_elem, si) {
267 u32 addr;
268 u32 len;
269
270 addr = (u32)sg_dma_address(sg);
271 *(__le32 *)(buf + i) = cpu_to_le32(addr);
272 i += 4;
273
274 len = sg_dma_len(sg) >> 3;
275 *(__le32 *)(buf + i) = cpu_to_le32(len);
276 i += 4;
277
278 last_buf = &buf[i];
279 buf[i++] = pFLAGS;
280 buf[i++] = qc->dev->dma_mode & 0xf;
281 buf[i++] = 0; /* pPKLW */
282 buf[i++] = 0; /* reserved */
283
284 *(__le32 *)(buf + i) =
285 (pFLAGS & pEND) ? 0 : cpu_to_le32(pp->pkt_dma + i + 4);
286 i += 4;
287 }
288
289 if (likely(last_buf))
290 *last_buf |= pEND;
291
292 return i;
293}
294
295static enum ata_completion_errors adma_qc_prep(struct ata_queued_cmd *qc)
296{
297 struct adma_port_priv *pp = qc->ap->private_data;
298 u8 *buf = pp->pkt;
299 u32 pkt_dma = (u32)pp->pkt_dma;
300 int i = 0;
301
302 adma_enter_reg_mode(qc->ap);
303 if (qc->tf.protocol != ATA_PROT_DMA)
304 return AC_ERR_OK;
305
306 buf[i++] = 0; /* Response flags */
307 buf[i++] = 0; /* reserved */
308 buf[i++] = cVLD | cDAT | cIEN;
309 i++; /* cLEN, gets filled in below */
310
311 *(__le32 *)(buf+i) = cpu_to_le32(pkt_dma); /* cNCPB */
312 i += 4; /* cNCPB */
313 i += 4; /* cPRD, gets filled in below */
314
315 buf[i++] = 0; /* reserved */
316 buf[i++] = 0; /* reserved */
317 buf[i++] = 0; /* reserved */
318 buf[i++] = 0; /* reserved */
319
320 /* ATA registers; must be a multiple of 4 */
321 buf[i++] = qc->tf.device;
322 buf[i++] = ADMA_REGS_DEVICE;
323 if ((qc->tf.flags & ATA_TFLAG_LBA48)) {
324 buf[i++] = qc->tf.hob_nsect;
325 buf[i++] = ADMA_REGS_SECTOR_COUNT;
326 buf[i++] = qc->tf.hob_lbal;
327 buf[i++] = ADMA_REGS_LBA_LOW;
328 buf[i++] = qc->tf.hob_lbam;
329 buf[i++] = ADMA_REGS_LBA_MID;
330 buf[i++] = qc->tf.hob_lbah;
331 buf[i++] = ADMA_REGS_LBA_HIGH;
332 }
333 buf[i++] = qc->tf.nsect;
334 buf[i++] = ADMA_REGS_SECTOR_COUNT;
335 buf[i++] = qc->tf.lbal;
336 buf[i++] = ADMA_REGS_LBA_LOW;
337 buf[i++] = qc->tf.lbam;
338 buf[i++] = ADMA_REGS_LBA_MID;
339 buf[i++] = qc->tf.lbah;
340 buf[i++] = ADMA_REGS_LBA_HIGH;
341 buf[i++] = 0;
342 buf[i++] = ADMA_REGS_CONTROL;
343 buf[i++] = rIGN;
344 buf[i++] = 0;
345 buf[i++] = qc->tf.command;
346 buf[i++] = ADMA_REGS_COMMAND | rEND;
347
348 buf[3] = (i >> 3) - 2; /* cLEN */
349 *(__le32 *)(buf+8) = cpu_to_le32(pkt_dma + i); /* cPRD */
350
351 i = adma_fill_sg(qc);
352 wmb(); /* flush PRDs and pkt to memory */
353 return AC_ERR_OK;
354}
355
356static inline void adma_packet_start(struct ata_queued_cmd *qc)
357{
358 struct ata_port *ap = qc->ap;
359 void __iomem *chan = ADMA_PORT_REGS(ap);
360
361 /* fire up the ADMA engine */
362 writew(aPIOMD4 | aGO, chan + ADMA_CONTROL);
363}
364
365static unsigned int adma_qc_issue(struct ata_queued_cmd *qc)
366{
367 struct adma_port_priv *pp = qc->ap->private_data;
368
369 switch (qc->tf.protocol) {
370 case ATA_PROT_DMA:
371 pp->state = adma_state_pkt;
372 adma_packet_start(qc);
373 return 0;
374
375 case ATAPI_PROT_DMA:
376 BUG();
377 break;
378
379 default:
380 break;
381 }
382
383 pp->state = adma_state_mmio;
384 return ata_sff_qc_issue(qc);
385}
386
387static inline unsigned int adma_intr_pkt(struct ata_host *host)
388{
389 unsigned int handled = 0, port_no;
390
391 for (port_no = 0; port_no < host->n_ports; ++port_no) {
392 struct ata_port *ap = host->ports[port_no];
393 struct adma_port_priv *pp;
394 struct ata_queued_cmd *qc;
395 void __iomem *chan = ADMA_PORT_REGS(ap);
396 u8 status = readb(chan + ADMA_STATUS);
397
398 if (status == 0)
399 continue;
400 handled = 1;
401 adma_enter_reg_mode(ap);
402 pp = ap->private_data;
403 if (!pp || pp->state != adma_state_pkt)
404 continue;
405 qc = ata_qc_from_tag(ap, ap->link.active_tag);
406 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
407 if (status & aPERR)
408 qc->err_mask |= AC_ERR_HOST_BUS;
409 else if ((status & (aPSD | aUIRQ)))
410 qc->err_mask |= AC_ERR_OTHER;
411
412 if (pp->pkt[0] & cATERR)
413 qc->err_mask |= AC_ERR_DEV;
414 else if (pp->pkt[0] != cDONE)
415 qc->err_mask |= AC_ERR_OTHER;
416
417 if (!qc->err_mask)
418 ata_qc_complete(qc);
419 else {
420 struct ata_eh_info *ehi = &ap->link.eh_info;
421 ata_ehi_clear_desc(ehi);
422 ata_ehi_push_desc(ehi,
423 "ADMA-status 0x%02X", status);
424 ata_ehi_push_desc(ehi,
425 "pkt[0] 0x%02X", pp->pkt[0]);
426
427 if (qc->err_mask == AC_ERR_DEV)
428 ata_port_abort(ap);
429 else
430 ata_port_freeze(ap);
431 }
432 }
433 }
434 return handled;
435}
436
437static inline unsigned int adma_intr_mmio(struct ata_host *host)
438{
439 unsigned int handled = 0, port_no;
440
441 for (port_no = 0; port_no < host->n_ports; ++port_no) {
442 struct ata_port *ap = host->ports[port_no];
443 struct adma_port_priv *pp = ap->private_data;
444 struct ata_queued_cmd *qc;
445
446 if (!pp || pp->state != adma_state_mmio)
447 continue;
448 qc = ata_qc_from_tag(ap, ap->link.active_tag);
449 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
450
451 /* check main status, clearing INTRQ */
452 u8 status = ata_sff_check_status(ap);
453 if ((status & ATA_BUSY))
454 continue;
455
456 /* complete taskfile transaction */
457 pp->state = adma_state_idle;
458 qc->err_mask |= ac_err_mask(status);
459 if (!qc->err_mask)
460 ata_qc_complete(qc);
461 else {
462 struct ata_eh_info *ehi = &ap->link.eh_info;
463 ata_ehi_clear_desc(ehi);
464 ata_ehi_push_desc(ehi, "status 0x%02X", status);
465
466 if (qc->err_mask == AC_ERR_DEV)
467 ata_port_abort(ap);
468 else
469 ata_port_freeze(ap);
470 }
471 handled = 1;
472 }
473 }
474 return handled;
475}
476
477static irqreturn_t adma_intr(int irq, void *dev_instance)
478{
479 struct ata_host *host = dev_instance;
480 unsigned int handled = 0;
481
482 spin_lock(&host->lock);
483 handled = adma_intr_pkt(host) | adma_intr_mmio(host);
484 spin_unlock(&host->lock);
485
486 return IRQ_RETVAL(handled);
487}
488
489static void adma_ata_setup_port(struct ata_ioports *port, void __iomem *base)
490{
491 port->cmd_addr =
492 port->data_addr = base + 0x000;
493 port->error_addr =
494 port->feature_addr = base + 0x004;
495 port->nsect_addr = base + 0x008;
496 port->lbal_addr = base + 0x00c;
497 port->lbam_addr = base + 0x010;
498 port->lbah_addr = base + 0x014;
499 port->device_addr = base + 0x018;
500 port->status_addr =
501 port->command_addr = base + 0x01c;
502 port->altstatus_addr =
503 port->ctl_addr = base + 0x038;
504}
505
506static int adma_port_start(struct ata_port *ap)
507{
508 struct device *dev = ap->host->dev;
509 struct adma_port_priv *pp;
510
511 adma_enter_reg_mode(ap);
512 pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
513 if (!pp)
514 return -ENOMEM;
515 pp->pkt = dmam_alloc_coherent(dev, ADMA_PKT_BYTES, &pp->pkt_dma,
516 GFP_KERNEL);
517 if (!pp->pkt)
518 return -ENOMEM;
519 /* paranoia? */
520 if ((pp->pkt_dma & 7) != 0) {
521 ata_port_err(ap, "bad alignment for pp->pkt_dma: %08x\n",
522 (u32)pp->pkt_dma);
523 return -ENOMEM;
524 }
525 ap->private_data = pp;
526 adma_reinit_engine(ap);
527 return 0;
528}
529
530static void adma_port_stop(struct ata_port *ap)
531{
532 adma_reset_engine(ap);
533}
534
535static void adma_host_init(struct ata_host *host, unsigned int chip_id)
536{
537 unsigned int port_no;
538
539 /* enable/lock aGO operation */
540 writeb(7, host->iomap[ADMA_MMIO_BAR] + ADMA_MODE_LOCK);
541
542 /* reset the ADMA logic */
543 for (port_no = 0; port_no < ADMA_PORTS; ++port_no)
544 adma_reset_engine(host->ports[port_no]);
545}
546
547static int adma_ata_init_one(struct pci_dev *pdev,
548 const struct pci_device_id *ent)
549{
550 unsigned int board_idx = (unsigned int) ent->driver_data;
551 const struct ata_port_info *ppi[] = { &adma_port_info[board_idx], NULL };
552 struct ata_host *host;
553 void __iomem *mmio_base;
554 int rc, port_no;
555
556 ata_print_version_once(&pdev->dev, DRV_VERSION);
557
558 /* alloc host */
559 host = ata_host_alloc_pinfo(&pdev->dev, ppi, ADMA_PORTS);
560 if (!host)
561 return -ENOMEM;
562
563 /* acquire resources and fill host */
564 rc = pcim_enable_device(pdev);
565 if (rc)
566 return rc;
567
568 if ((pci_resource_flags(pdev, 4) & IORESOURCE_MEM) == 0)
569 return -ENODEV;
570
571 rc = pcim_iomap_regions(pdev, 1 << ADMA_MMIO_BAR, DRV_NAME);
572 if (rc)
573 return rc;
574 host->iomap = pcim_iomap_table(pdev);
575 mmio_base = host->iomap[ADMA_MMIO_BAR];
576
577 rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
578 if (rc) {
579 dev_err(&pdev->dev, "32-bit DMA enable failed\n");
580 return rc;
581 }
582
583 for (port_no = 0; port_no < ADMA_PORTS; ++port_no) {
584 struct ata_port *ap = host->ports[port_no];
585 void __iomem *port_base = ADMA_ATA_REGS(mmio_base, port_no);
586 unsigned int offset = port_base - mmio_base;
587
588 adma_ata_setup_port(&ap->ioaddr, port_base);
589
590 ata_port_pbar_desc(ap, ADMA_MMIO_BAR, -1, "mmio");
591 ata_port_pbar_desc(ap, ADMA_MMIO_BAR, offset, "port");
592 }
593
594 /* initialize adapter */
595 adma_host_init(host, board_idx);
596
597 pci_set_master(pdev);
598 return ata_host_activate(host, pdev->irq, adma_intr, IRQF_SHARED,
599 &adma_ata_sht);
600}
601
602module_pci_driver(adma_ata_pci_driver);
603
604MODULE_AUTHOR("Mark Lord");
605MODULE_DESCRIPTION("Pacific Digital Corporation ADMA low-level driver");
606MODULE_LICENSE("GPL");
607MODULE_DEVICE_TABLE(pci, adma_ata_pci_tbl);
608MODULE_VERSION(DRV_VERSION);
1/*
2 * pdc_adma.c - Pacific Digital Corporation ADMA
3 *
4 * Maintained by: Mark Lord <mlord@pobox.com>
5 *
6 * Copyright 2005 Mark Lord
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2, or (at your option)
11 * any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; see the file COPYING. If not, write to
20 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 *
23 * libata documentation is available via 'make {ps|pdf}docs',
24 * as Documentation/DocBook/libata.*
25 *
26 *
27 * Supports ATA disks in single-packet ADMA mode.
28 * Uses PIO for everything else.
29 *
30 * TODO: Use ADMA transfers for ATAPI devices, when possible.
31 * This requires careful attention to a number of quirks of the chip.
32 *
33 */
34
35#include <linux/kernel.h>
36#include <linux/module.h>
37#include <linux/gfp.h>
38#include <linux/pci.h>
39#include <linux/init.h>
40#include <linux/blkdev.h>
41#include <linux/delay.h>
42#include <linux/interrupt.h>
43#include <linux/device.h>
44#include <scsi/scsi_host.h>
45#include <linux/libata.h>
46
47#define DRV_NAME "pdc_adma"
48#define DRV_VERSION "1.0"
49
50/* macro to calculate base address for ATA regs */
51#define ADMA_ATA_REGS(base, port_no) ((base) + ((port_no) * 0x40))
52
53/* macro to calculate base address for ADMA regs */
54#define ADMA_REGS(base, port_no) ((base) + 0x80 + ((port_no) * 0x20))
55
56/* macro to obtain addresses from ata_port */
57#define ADMA_PORT_REGS(ap) \
58 ADMA_REGS((ap)->host->iomap[ADMA_MMIO_BAR], ap->port_no)
59
60enum {
61 ADMA_MMIO_BAR = 4,
62
63 ADMA_PORTS = 2,
64 ADMA_CPB_BYTES = 40,
65 ADMA_PRD_BYTES = LIBATA_MAX_PRD * 16,
66 ADMA_PKT_BYTES = ADMA_CPB_BYTES + ADMA_PRD_BYTES,
67
68 ADMA_DMA_BOUNDARY = 0xffffffff,
69
70 /* global register offsets */
71 ADMA_MODE_LOCK = 0x00c7,
72
73 /* per-channel register offsets */
74 ADMA_CONTROL = 0x0000, /* ADMA control */
75 ADMA_STATUS = 0x0002, /* ADMA status */
76 ADMA_CPB_COUNT = 0x0004, /* CPB count */
77 ADMA_CPB_CURRENT = 0x000c, /* current CPB address */
78 ADMA_CPB_NEXT = 0x000c, /* next CPB address */
79 ADMA_CPB_LOOKUP = 0x0010, /* CPB lookup table */
80 ADMA_FIFO_IN = 0x0014, /* input FIFO threshold */
81 ADMA_FIFO_OUT = 0x0016, /* output FIFO threshold */
82
83 /* ADMA_CONTROL register bits */
84 aNIEN = (1 << 8), /* irq mask: 1==masked */
85 aGO = (1 << 7), /* packet trigger ("Go!") */
86 aRSTADM = (1 << 5), /* ADMA logic reset */
87 aPIOMD4 = 0x0003, /* PIO mode 4 */
88
89 /* ADMA_STATUS register bits */
90 aPSD = (1 << 6),
91 aUIRQ = (1 << 4),
92 aPERR = (1 << 0),
93
94 /* CPB bits */
95 cDONE = (1 << 0),
96 cATERR = (1 << 3),
97
98 cVLD = (1 << 0),
99 cDAT = (1 << 2),
100 cIEN = (1 << 3),
101
102 /* PRD bits */
103 pORD = (1 << 4),
104 pDIRO = (1 << 5),
105 pEND = (1 << 7),
106
107 /* ATA register flags */
108 rIGN = (1 << 5),
109 rEND = (1 << 7),
110
111 /* ATA register addresses */
112 ADMA_REGS_CONTROL = 0x0e,
113 ADMA_REGS_SECTOR_COUNT = 0x12,
114 ADMA_REGS_LBA_LOW = 0x13,
115 ADMA_REGS_LBA_MID = 0x14,
116 ADMA_REGS_LBA_HIGH = 0x15,
117 ADMA_REGS_DEVICE = 0x16,
118 ADMA_REGS_COMMAND = 0x17,
119
120 /* PCI device IDs */
121 board_1841_idx = 0, /* ADMA 2-port controller */
122};
123
124typedef enum { adma_state_idle, adma_state_pkt, adma_state_mmio } adma_state_t;
125
126struct adma_port_priv {
127 u8 *pkt;
128 dma_addr_t pkt_dma;
129 adma_state_t state;
130};
131
132static int adma_ata_init_one(struct pci_dev *pdev,
133 const struct pci_device_id *ent);
134static int adma_port_start(struct ata_port *ap);
135static void adma_port_stop(struct ata_port *ap);
136static void adma_qc_prep(struct ata_queued_cmd *qc);
137static unsigned int adma_qc_issue(struct ata_queued_cmd *qc);
138static int adma_check_atapi_dma(struct ata_queued_cmd *qc);
139static void adma_freeze(struct ata_port *ap);
140static void adma_thaw(struct ata_port *ap);
141static int adma_prereset(struct ata_link *link, unsigned long deadline);
142
143static struct scsi_host_template adma_ata_sht = {
144 ATA_BASE_SHT(DRV_NAME),
145 .sg_tablesize = LIBATA_MAX_PRD,
146 .dma_boundary = ADMA_DMA_BOUNDARY,
147};
148
149static struct ata_port_operations adma_ata_ops = {
150 .inherits = &ata_sff_port_ops,
151
152 .lost_interrupt = ATA_OP_NULL,
153
154 .check_atapi_dma = adma_check_atapi_dma,
155 .qc_prep = adma_qc_prep,
156 .qc_issue = adma_qc_issue,
157
158 .freeze = adma_freeze,
159 .thaw = adma_thaw,
160 .prereset = adma_prereset,
161
162 .port_start = adma_port_start,
163 .port_stop = adma_port_stop,
164};
165
166static struct ata_port_info adma_port_info[] = {
167 /* board_1841_idx */
168 {
169 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_POLLING,
170 .pio_mask = ATA_PIO4_ONLY,
171 .udma_mask = ATA_UDMA4,
172 .port_ops = &adma_ata_ops,
173 },
174};
175
176static const struct pci_device_id adma_ata_pci_tbl[] = {
177 { PCI_VDEVICE(PDC, 0x1841), board_1841_idx },
178
179 { } /* terminate list */
180};
181
182static struct pci_driver adma_ata_pci_driver = {
183 .name = DRV_NAME,
184 .id_table = adma_ata_pci_tbl,
185 .probe = adma_ata_init_one,
186 .remove = ata_pci_remove_one,
187};
188
189static int adma_check_atapi_dma(struct ata_queued_cmd *qc)
190{
191 return 1; /* ATAPI DMA not yet supported */
192}
193
194static void adma_reset_engine(struct ata_port *ap)
195{
196 void __iomem *chan = ADMA_PORT_REGS(ap);
197
198 /* reset ADMA to idle state */
199 writew(aPIOMD4 | aNIEN | aRSTADM, chan + ADMA_CONTROL);
200 udelay(2);
201 writew(aPIOMD4, chan + ADMA_CONTROL);
202 udelay(2);
203}
204
205static void adma_reinit_engine(struct ata_port *ap)
206{
207 struct adma_port_priv *pp = ap->private_data;
208 void __iomem *chan = ADMA_PORT_REGS(ap);
209
210 /* mask/clear ATA interrupts */
211 writeb(ATA_NIEN, ap->ioaddr.ctl_addr);
212 ata_sff_check_status(ap);
213
214 /* reset the ADMA engine */
215 adma_reset_engine(ap);
216
217 /* set in-FIFO threshold to 0x100 */
218 writew(0x100, chan + ADMA_FIFO_IN);
219
220 /* set CPB pointer */
221 writel((u32)pp->pkt_dma, chan + ADMA_CPB_NEXT);
222
223 /* set out-FIFO threshold to 0x100 */
224 writew(0x100, chan + ADMA_FIFO_OUT);
225
226 /* set CPB count */
227 writew(1, chan + ADMA_CPB_COUNT);
228
229 /* read/discard ADMA status */
230 readb(chan + ADMA_STATUS);
231}
232
233static inline void adma_enter_reg_mode(struct ata_port *ap)
234{
235 void __iomem *chan = ADMA_PORT_REGS(ap);
236
237 writew(aPIOMD4, chan + ADMA_CONTROL);
238 readb(chan + ADMA_STATUS); /* flush */
239}
240
241static void adma_freeze(struct ata_port *ap)
242{
243 void __iomem *chan = ADMA_PORT_REGS(ap);
244
245 /* mask/clear ATA interrupts */
246 writeb(ATA_NIEN, ap->ioaddr.ctl_addr);
247 ata_sff_check_status(ap);
248
249 /* reset ADMA to idle state */
250 writew(aPIOMD4 | aNIEN | aRSTADM, chan + ADMA_CONTROL);
251 udelay(2);
252 writew(aPIOMD4 | aNIEN, chan + ADMA_CONTROL);
253 udelay(2);
254}
255
256static void adma_thaw(struct ata_port *ap)
257{
258 adma_reinit_engine(ap);
259}
260
261static int adma_prereset(struct ata_link *link, unsigned long deadline)
262{
263 struct ata_port *ap = link->ap;
264 struct adma_port_priv *pp = ap->private_data;
265
266 if (pp->state != adma_state_idle) /* healthy paranoia */
267 pp->state = adma_state_mmio;
268 adma_reinit_engine(ap);
269
270 return ata_sff_prereset(link, deadline);
271}
272
273static int adma_fill_sg(struct ata_queued_cmd *qc)
274{
275 struct scatterlist *sg;
276 struct ata_port *ap = qc->ap;
277 struct adma_port_priv *pp = ap->private_data;
278 u8 *buf = pp->pkt, *last_buf = NULL;
279 int i = (2 + buf[3]) * 8;
280 u8 pFLAGS = pORD | ((qc->tf.flags & ATA_TFLAG_WRITE) ? pDIRO : 0);
281 unsigned int si;
282
283 for_each_sg(qc->sg, sg, qc->n_elem, si) {
284 u32 addr;
285 u32 len;
286
287 addr = (u32)sg_dma_address(sg);
288 *(__le32 *)(buf + i) = cpu_to_le32(addr);
289 i += 4;
290
291 len = sg_dma_len(sg) >> 3;
292 *(__le32 *)(buf + i) = cpu_to_le32(len);
293 i += 4;
294
295 last_buf = &buf[i];
296 buf[i++] = pFLAGS;
297 buf[i++] = qc->dev->dma_mode & 0xf;
298 buf[i++] = 0; /* pPKLW */
299 buf[i++] = 0; /* reserved */
300
301 *(__le32 *)(buf + i) =
302 (pFLAGS & pEND) ? 0 : cpu_to_le32(pp->pkt_dma + i + 4);
303 i += 4;
304
305 VPRINTK("PRD[%u] = (0x%lX, 0x%X)\n", i/4,
306 (unsigned long)addr, len);
307 }
308
309 if (likely(last_buf))
310 *last_buf |= pEND;
311
312 return i;
313}
314
315static void adma_qc_prep(struct ata_queued_cmd *qc)
316{
317 struct adma_port_priv *pp = qc->ap->private_data;
318 u8 *buf = pp->pkt;
319 u32 pkt_dma = (u32)pp->pkt_dma;
320 int i = 0;
321
322 VPRINTK("ENTER\n");
323
324 adma_enter_reg_mode(qc->ap);
325 if (qc->tf.protocol != ATA_PROT_DMA)
326 return;
327
328 buf[i++] = 0; /* Response flags */
329 buf[i++] = 0; /* reserved */
330 buf[i++] = cVLD | cDAT | cIEN;
331 i++; /* cLEN, gets filled in below */
332
333 *(__le32 *)(buf+i) = cpu_to_le32(pkt_dma); /* cNCPB */
334 i += 4; /* cNCPB */
335 i += 4; /* cPRD, gets filled in below */
336
337 buf[i++] = 0; /* reserved */
338 buf[i++] = 0; /* reserved */
339 buf[i++] = 0; /* reserved */
340 buf[i++] = 0; /* reserved */
341
342 /* ATA registers; must be a multiple of 4 */
343 buf[i++] = qc->tf.device;
344 buf[i++] = ADMA_REGS_DEVICE;
345 if ((qc->tf.flags & ATA_TFLAG_LBA48)) {
346 buf[i++] = qc->tf.hob_nsect;
347 buf[i++] = ADMA_REGS_SECTOR_COUNT;
348 buf[i++] = qc->tf.hob_lbal;
349 buf[i++] = ADMA_REGS_LBA_LOW;
350 buf[i++] = qc->tf.hob_lbam;
351 buf[i++] = ADMA_REGS_LBA_MID;
352 buf[i++] = qc->tf.hob_lbah;
353 buf[i++] = ADMA_REGS_LBA_HIGH;
354 }
355 buf[i++] = qc->tf.nsect;
356 buf[i++] = ADMA_REGS_SECTOR_COUNT;
357 buf[i++] = qc->tf.lbal;
358 buf[i++] = ADMA_REGS_LBA_LOW;
359 buf[i++] = qc->tf.lbam;
360 buf[i++] = ADMA_REGS_LBA_MID;
361 buf[i++] = qc->tf.lbah;
362 buf[i++] = ADMA_REGS_LBA_HIGH;
363 buf[i++] = 0;
364 buf[i++] = ADMA_REGS_CONTROL;
365 buf[i++] = rIGN;
366 buf[i++] = 0;
367 buf[i++] = qc->tf.command;
368 buf[i++] = ADMA_REGS_COMMAND | rEND;
369
370 buf[3] = (i >> 3) - 2; /* cLEN */
371 *(__le32 *)(buf+8) = cpu_to_le32(pkt_dma + i); /* cPRD */
372
373 i = adma_fill_sg(qc);
374 wmb(); /* flush PRDs and pkt to memory */
375#if 0
376 /* dump out CPB + PRDs for debug */
377 {
378 int j, len = 0;
379 static char obuf[2048];
380 for (j = 0; j < i; ++j) {
381 len += sprintf(obuf+len, "%02x ", buf[j]);
382 if ((j & 7) == 7) {
383 printk("%s\n", obuf);
384 len = 0;
385 }
386 }
387 if (len)
388 printk("%s\n", obuf);
389 }
390#endif
391}
392
393static inline void adma_packet_start(struct ata_queued_cmd *qc)
394{
395 struct ata_port *ap = qc->ap;
396 void __iomem *chan = ADMA_PORT_REGS(ap);
397
398 VPRINTK("ENTER, ap %p\n", ap);
399
400 /* fire up the ADMA engine */
401 writew(aPIOMD4 | aGO, chan + ADMA_CONTROL);
402}
403
404static unsigned int adma_qc_issue(struct ata_queued_cmd *qc)
405{
406 struct adma_port_priv *pp = qc->ap->private_data;
407
408 switch (qc->tf.protocol) {
409 case ATA_PROT_DMA:
410 pp->state = adma_state_pkt;
411 adma_packet_start(qc);
412 return 0;
413
414 case ATAPI_PROT_DMA:
415 BUG();
416 break;
417
418 default:
419 break;
420 }
421
422 pp->state = adma_state_mmio;
423 return ata_sff_qc_issue(qc);
424}
425
426static inline unsigned int adma_intr_pkt(struct ata_host *host)
427{
428 unsigned int handled = 0, port_no;
429
430 for (port_no = 0; port_no < host->n_ports; ++port_no) {
431 struct ata_port *ap = host->ports[port_no];
432 struct adma_port_priv *pp;
433 struct ata_queued_cmd *qc;
434 void __iomem *chan = ADMA_PORT_REGS(ap);
435 u8 status = readb(chan + ADMA_STATUS);
436
437 if (status == 0)
438 continue;
439 handled = 1;
440 adma_enter_reg_mode(ap);
441 pp = ap->private_data;
442 if (!pp || pp->state != adma_state_pkt)
443 continue;
444 qc = ata_qc_from_tag(ap, ap->link.active_tag);
445 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
446 if (status & aPERR)
447 qc->err_mask |= AC_ERR_HOST_BUS;
448 else if ((status & (aPSD | aUIRQ)))
449 qc->err_mask |= AC_ERR_OTHER;
450
451 if (pp->pkt[0] & cATERR)
452 qc->err_mask |= AC_ERR_DEV;
453 else if (pp->pkt[0] != cDONE)
454 qc->err_mask |= AC_ERR_OTHER;
455
456 if (!qc->err_mask)
457 ata_qc_complete(qc);
458 else {
459 struct ata_eh_info *ehi = &ap->link.eh_info;
460 ata_ehi_clear_desc(ehi);
461 ata_ehi_push_desc(ehi,
462 "ADMA-status 0x%02X", status);
463 ata_ehi_push_desc(ehi,
464 "pkt[0] 0x%02X", pp->pkt[0]);
465
466 if (qc->err_mask == AC_ERR_DEV)
467 ata_port_abort(ap);
468 else
469 ata_port_freeze(ap);
470 }
471 }
472 }
473 return handled;
474}
475
476static inline unsigned int adma_intr_mmio(struct ata_host *host)
477{
478 unsigned int handled = 0, port_no;
479
480 for (port_no = 0; port_no < host->n_ports; ++port_no) {
481 struct ata_port *ap = host->ports[port_no];
482 struct adma_port_priv *pp = ap->private_data;
483 struct ata_queued_cmd *qc;
484
485 if (!pp || pp->state != adma_state_mmio)
486 continue;
487 qc = ata_qc_from_tag(ap, ap->link.active_tag);
488 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
489
490 /* check main status, clearing INTRQ */
491 u8 status = ata_sff_check_status(ap);
492 if ((status & ATA_BUSY))
493 continue;
494 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
495 ap->print_id, qc->tf.protocol, status);
496
497 /* complete taskfile transaction */
498 pp->state = adma_state_idle;
499 qc->err_mask |= ac_err_mask(status);
500 if (!qc->err_mask)
501 ata_qc_complete(qc);
502 else {
503 struct ata_eh_info *ehi = &ap->link.eh_info;
504 ata_ehi_clear_desc(ehi);
505 ata_ehi_push_desc(ehi, "status 0x%02X", status);
506
507 if (qc->err_mask == AC_ERR_DEV)
508 ata_port_abort(ap);
509 else
510 ata_port_freeze(ap);
511 }
512 handled = 1;
513 }
514 }
515 return handled;
516}
517
518static irqreturn_t adma_intr(int irq, void *dev_instance)
519{
520 struct ata_host *host = dev_instance;
521 unsigned int handled = 0;
522
523 VPRINTK("ENTER\n");
524
525 spin_lock(&host->lock);
526 handled = adma_intr_pkt(host) | adma_intr_mmio(host);
527 spin_unlock(&host->lock);
528
529 VPRINTK("EXIT\n");
530
531 return IRQ_RETVAL(handled);
532}
533
534static void adma_ata_setup_port(struct ata_ioports *port, void __iomem *base)
535{
536 port->cmd_addr =
537 port->data_addr = base + 0x000;
538 port->error_addr =
539 port->feature_addr = base + 0x004;
540 port->nsect_addr = base + 0x008;
541 port->lbal_addr = base + 0x00c;
542 port->lbam_addr = base + 0x010;
543 port->lbah_addr = base + 0x014;
544 port->device_addr = base + 0x018;
545 port->status_addr =
546 port->command_addr = base + 0x01c;
547 port->altstatus_addr =
548 port->ctl_addr = base + 0x038;
549}
550
551static int adma_port_start(struct ata_port *ap)
552{
553 struct device *dev = ap->host->dev;
554 struct adma_port_priv *pp;
555
556 adma_enter_reg_mode(ap);
557 pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
558 if (!pp)
559 return -ENOMEM;
560 pp->pkt = dmam_alloc_coherent(dev, ADMA_PKT_BYTES, &pp->pkt_dma,
561 GFP_KERNEL);
562 if (!pp->pkt)
563 return -ENOMEM;
564 /* paranoia? */
565 if ((pp->pkt_dma & 7) != 0) {
566 printk(KERN_ERR "bad alignment for pp->pkt_dma: %08x\n",
567 (u32)pp->pkt_dma);
568 return -ENOMEM;
569 }
570 memset(pp->pkt, 0, ADMA_PKT_BYTES);
571 ap->private_data = pp;
572 adma_reinit_engine(ap);
573 return 0;
574}
575
576static void adma_port_stop(struct ata_port *ap)
577{
578 adma_reset_engine(ap);
579}
580
581static void adma_host_init(struct ata_host *host, unsigned int chip_id)
582{
583 unsigned int port_no;
584
585 /* enable/lock aGO operation */
586 writeb(7, host->iomap[ADMA_MMIO_BAR] + ADMA_MODE_LOCK);
587
588 /* reset the ADMA logic */
589 for (port_no = 0; port_no < ADMA_PORTS; ++port_no)
590 adma_reset_engine(host->ports[port_no]);
591}
592
593static int adma_set_dma_masks(struct pci_dev *pdev, void __iomem *mmio_base)
594{
595 int rc;
596
597 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
598 if (rc) {
599 dev_err(&pdev->dev, "32-bit DMA enable failed\n");
600 return rc;
601 }
602 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
603 if (rc) {
604 dev_err(&pdev->dev, "32-bit consistent DMA enable failed\n");
605 return rc;
606 }
607 return 0;
608}
609
610static int adma_ata_init_one(struct pci_dev *pdev,
611 const struct pci_device_id *ent)
612{
613 unsigned int board_idx = (unsigned int) ent->driver_data;
614 const struct ata_port_info *ppi[] = { &adma_port_info[board_idx], NULL };
615 struct ata_host *host;
616 void __iomem *mmio_base;
617 int rc, port_no;
618
619 ata_print_version_once(&pdev->dev, DRV_VERSION);
620
621 /* alloc host */
622 host = ata_host_alloc_pinfo(&pdev->dev, ppi, ADMA_PORTS);
623 if (!host)
624 return -ENOMEM;
625
626 /* acquire resources and fill host */
627 rc = pcim_enable_device(pdev);
628 if (rc)
629 return rc;
630
631 if ((pci_resource_flags(pdev, 4) & IORESOURCE_MEM) == 0)
632 return -ENODEV;
633
634 rc = pcim_iomap_regions(pdev, 1 << ADMA_MMIO_BAR, DRV_NAME);
635 if (rc)
636 return rc;
637 host->iomap = pcim_iomap_table(pdev);
638 mmio_base = host->iomap[ADMA_MMIO_BAR];
639
640 rc = adma_set_dma_masks(pdev, mmio_base);
641 if (rc)
642 return rc;
643
644 for (port_no = 0; port_no < ADMA_PORTS; ++port_no) {
645 struct ata_port *ap = host->ports[port_no];
646 void __iomem *port_base = ADMA_ATA_REGS(mmio_base, port_no);
647 unsigned int offset = port_base - mmio_base;
648
649 adma_ata_setup_port(&ap->ioaddr, port_base);
650
651 ata_port_pbar_desc(ap, ADMA_MMIO_BAR, -1, "mmio");
652 ata_port_pbar_desc(ap, ADMA_MMIO_BAR, offset, "port");
653 }
654
655 /* initialize adapter */
656 adma_host_init(host, board_idx);
657
658 pci_set_master(pdev);
659 return ata_host_activate(host, pdev->irq, adma_intr, IRQF_SHARED,
660 &adma_ata_sht);
661}
662
663static int __init adma_ata_init(void)
664{
665 return pci_register_driver(&adma_ata_pci_driver);
666}
667
668static void __exit adma_ata_exit(void)
669{
670 pci_unregister_driver(&adma_ata_pci_driver);
671}
672
673MODULE_AUTHOR("Mark Lord");
674MODULE_DESCRIPTION("Pacific Digital Corporation ADMA low-level driver");
675MODULE_LICENSE("GPL");
676MODULE_DEVICE_TABLE(pci, adma_ata_pci_tbl);
677MODULE_VERSION(DRV_VERSION);
678
679module_init(adma_ata_init);
680module_exit(adma_ata_exit);