2 * pdc_adma.c - Pacific Digital Corporation ADMA
4 * Maintained by: Mark Lord <mlord@pobox.com>
6 * Copyright 2005 Mark Lord
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)
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.
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.
23 * libata documentation is available via 'make {ps|pdf}docs',
24 * as Documentation/DocBook/libata.*
27 * Supports ATA disks in single-packet ADMA mode.
28 * Uses PIO for everything else.
30 * TODO: Use ADMA transfers for ATAPI devices, when possible.
31 * This requires careful attention to a number of quirks of the chip.
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/pci.h>
38 #include <linux/init.h>
39 #include <linux/blkdev.h>
40 #include <linux/delay.h>
41 #include <linux/interrupt.h>
42 #include <linux/device.h>
43 #include <scsi/scsi_host.h>
44 #include <linux/libata.h>
46 #define DRV_NAME "pdc_adma"
47 #define DRV_VERSION "1.0"
49 /* macro to calculate base address for ATA regs */
50 #define ADMA_ATA_REGS(base, port_no) ((base) + ((port_no) * 0x40))
52 /* macro to calculate base address for ADMA regs */
53 #define ADMA_REGS(base, port_no) ((base) + 0x80 + ((port_no) * 0x20))
55 /* macro to obtain addresses from ata_port */
56 #define ADMA_PORT_REGS(ap) \
57 ADMA_REGS((ap)->host->iomap[ADMA_MMIO_BAR], ap->port_no)
64 ADMA_PRD_BYTES = LIBATA_MAX_PRD * 16,
65 ADMA_PKT_BYTES = ADMA_CPB_BYTES + ADMA_PRD_BYTES,
67 ADMA_DMA_BOUNDARY = 0xffffffff,
69 /* global register offsets */
70 ADMA_MODE_LOCK = 0x00c7,
72 /* per-channel register offsets */
73 ADMA_CONTROL = 0x0000, /* ADMA control */
74 ADMA_STATUS = 0x0002, /* ADMA status */
75 ADMA_CPB_COUNT = 0x0004, /* CPB count */
76 ADMA_CPB_CURRENT = 0x000c, /* current CPB address */
77 ADMA_CPB_NEXT = 0x000c, /* next CPB address */
78 ADMA_CPB_LOOKUP = 0x0010, /* CPB lookup table */
79 ADMA_FIFO_IN = 0x0014, /* input FIFO threshold */
80 ADMA_FIFO_OUT = 0x0016, /* output FIFO threshold */
82 /* ADMA_CONTROL register bits */
83 aNIEN = (1 << 8), /* irq mask: 1==masked */
84 aGO = (1 << 7), /* packet trigger ("Go!") */
85 aRSTADM = (1 << 5), /* ADMA logic reset */
86 aPIOMD4 = 0x0003, /* PIO mode 4 */
88 /* ADMA_STATUS register bits */
106 /* ATA register flags */
110 /* ATA register addresses */
111 ADMA_REGS_CONTROL = 0x0e,
112 ADMA_REGS_SECTOR_COUNT = 0x12,
113 ADMA_REGS_LBA_LOW = 0x13,
114 ADMA_REGS_LBA_MID = 0x14,
115 ADMA_REGS_LBA_HIGH = 0x15,
116 ADMA_REGS_DEVICE = 0x16,
117 ADMA_REGS_COMMAND = 0x17,
120 board_1841_idx = 0, /* ADMA 2-port controller */
123 typedef enum { adma_state_idle, adma_state_pkt, adma_state_mmio } adma_state_t;
125 struct adma_port_priv {
131 static int adma_ata_init_one(struct pci_dev *pdev,
132 const struct pci_device_id *ent);
133 static int adma_port_start(struct ata_port *ap);
134 static void adma_host_stop(struct ata_host *host);
135 static void adma_port_stop(struct ata_port *ap);
136 static void adma_qc_prep(struct ata_queued_cmd *qc);
137 static unsigned int adma_qc_issue(struct ata_queued_cmd *qc);
138 static int adma_check_atapi_dma(struct ata_queued_cmd *qc);
139 static void adma_bmdma_stop(struct ata_queued_cmd *qc);
140 static u8 adma_bmdma_status(struct ata_port *ap);
141 static void adma_irq_clear(struct ata_port *ap);
142 static void adma_freeze(struct ata_port *ap);
143 static void adma_thaw(struct ata_port *ap);
144 static void adma_error_handler(struct ata_port *ap);
146 static struct scsi_host_template adma_ata_sht = {
147 .module = THIS_MODULE,
149 .ioctl = ata_scsi_ioctl,
150 .queuecommand = ata_scsi_queuecmd,
151 .slave_configure = ata_scsi_slave_config,
152 .slave_destroy = ata_scsi_slave_destroy,
153 .bios_param = ata_std_bios_param,
154 .proc_name = DRV_NAME,
155 .can_queue = ATA_DEF_QUEUE,
156 .this_id = ATA_SHT_THIS_ID,
157 .sg_tablesize = LIBATA_MAX_PRD,
158 .dma_boundary = ADMA_DMA_BOUNDARY,
159 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
160 .use_clustering = ENABLE_CLUSTERING,
161 .emulated = ATA_SHT_EMULATED,
164 static const struct ata_port_operations adma_ata_ops = {
165 .tf_load = ata_tf_load,
166 .tf_read = ata_tf_read,
167 .exec_command = ata_exec_command,
168 .check_status = ata_check_status,
169 .dev_select = ata_std_dev_select,
170 .check_atapi_dma = adma_check_atapi_dma,
171 .data_xfer = ata_data_xfer,
172 .qc_prep = adma_qc_prep,
173 .qc_issue = adma_qc_issue,
174 .freeze = adma_freeze,
176 .error_handler = adma_error_handler,
177 .irq_clear = adma_irq_clear,
178 .irq_on = ata_irq_on,
179 .port_start = adma_port_start,
180 .port_stop = adma_port_stop,
181 .host_stop = adma_host_stop,
182 .bmdma_stop = adma_bmdma_stop,
183 .bmdma_status = adma_bmdma_status,
186 static struct ata_port_info adma_port_info[] = {
189 .flags = ATA_FLAG_SLAVE_POSS |
190 ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO |
191 ATA_FLAG_PIO_POLLING,
192 .pio_mask = 0x10, /* pio4 */
193 .udma_mask = ATA_UDMA4,
194 .port_ops = &adma_ata_ops,
198 static const struct pci_device_id adma_ata_pci_tbl[] = {
199 { PCI_VDEVICE(PDC, 0x1841), board_1841_idx },
201 { } /* terminate list */
204 static struct pci_driver adma_ata_pci_driver = {
206 .id_table = adma_ata_pci_tbl,
207 .probe = adma_ata_init_one,
208 .remove = ata_pci_remove_one,
211 static int adma_check_atapi_dma(struct ata_queued_cmd *qc)
213 return 1; /* ATAPI DMA not yet supported */
216 static void adma_bmdma_stop(struct ata_queued_cmd *qc)
221 static u8 adma_bmdma_status(struct ata_port *ap)
226 static void adma_irq_clear(struct ata_port *ap)
231 static void adma_reset_engine(struct ata_port *ap)
233 void __iomem *chan = ADMA_PORT_REGS(ap);
235 /* reset ADMA to idle state */
236 writew(aPIOMD4 | aNIEN | aRSTADM, chan + ADMA_CONTROL);
238 writew(aPIOMD4, chan + ADMA_CONTROL);
242 static void adma_reinit_engine(struct ata_port *ap)
244 struct adma_port_priv *pp = ap->private_data;
245 void __iomem *chan = ADMA_PORT_REGS(ap);
247 /* mask/clear ATA interrupts */
248 writeb(ATA_NIEN, ap->ioaddr.ctl_addr);
249 ata_check_status(ap);
251 /* reset the ADMA engine */
252 adma_reset_engine(ap);
254 /* set in-FIFO threshold to 0x100 */
255 writew(0x100, chan + ADMA_FIFO_IN);
257 /* set CPB pointer */
258 writel((u32)pp->pkt_dma, chan + ADMA_CPB_NEXT);
260 /* set out-FIFO threshold to 0x100 */
261 writew(0x100, chan + ADMA_FIFO_OUT);
264 writew(1, chan + ADMA_CPB_COUNT);
266 /* read/discard ADMA status */
267 readb(chan + ADMA_STATUS);
270 static inline void adma_enter_reg_mode(struct ata_port *ap)
272 void __iomem *chan = ADMA_PORT_REGS(ap);
274 writew(aPIOMD4, chan + ADMA_CONTROL);
275 readb(chan + ADMA_STATUS); /* flush */
278 static void adma_freeze(struct ata_port *ap)
280 void __iomem *chan = ADMA_PORT_REGS(ap);
282 /* mask/clear ATA interrupts */
283 writeb(ATA_NIEN, ap->ioaddr.ctl_addr);
284 ata_check_status(ap);
286 /* reset ADMA to idle state */
287 writew(aPIOMD4 | aNIEN | aRSTADM, chan + ADMA_CONTROL);
289 writew(aPIOMD4 | aNIEN, chan + ADMA_CONTROL);
293 static void adma_thaw(struct ata_port *ap)
295 adma_reinit_engine(ap);
298 static int adma_prereset(struct ata_link *link, unsigned long deadline)
300 struct ata_port *ap = link->ap;
301 struct adma_port_priv *pp = ap->private_data;
303 if (pp->state != adma_state_idle) /* healthy paranoia */
304 pp->state = adma_state_mmio;
305 adma_reinit_engine(ap);
307 return ata_std_prereset(link, deadline);
310 static void adma_error_handler(struct ata_port *ap)
312 ata_do_eh(ap, adma_prereset, ata_std_softreset, NULL,
316 static int adma_fill_sg(struct ata_queued_cmd *qc)
318 struct scatterlist *sg;
319 struct ata_port *ap = qc->ap;
320 struct adma_port_priv *pp = ap->private_data;
321 u8 *buf = pp->pkt, *last_buf = NULL;
322 int i = (2 + buf[3]) * 8;
323 u8 pFLAGS = pORD | ((qc->tf.flags & ATA_TFLAG_WRITE) ? pDIRO : 0);
326 for_each_sg(qc->sg, sg, qc->n_elem, si) {
330 addr = (u32)sg_dma_address(sg);
331 *(__le32 *)(buf + i) = cpu_to_le32(addr);
334 len = sg_dma_len(sg) >> 3;
335 *(__le32 *)(buf + i) = cpu_to_le32(len);
340 buf[i++] = qc->dev->dma_mode & 0xf;
341 buf[i++] = 0; /* pPKLW */
342 buf[i++] = 0; /* reserved */
344 *(__le32 *)(buf + i) =
345 (pFLAGS & pEND) ? 0 : cpu_to_le32(pp->pkt_dma + i + 4);
348 VPRINTK("PRD[%u] = (0x%lX, 0x%X)\n", i/4,
349 (unsigned long)addr, len);
352 if (likely(last_buf))
358 static void adma_qc_prep(struct ata_queued_cmd *qc)
360 struct adma_port_priv *pp = qc->ap->private_data;
362 u32 pkt_dma = (u32)pp->pkt_dma;
367 adma_enter_reg_mode(qc->ap);
368 if (qc->tf.protocol != ATA_PROT_DMA) {
373 buf[i++] = 0; /* Response flags */
374 buf[i++] = 0; /* reserved */
375 buf[i++] = cVLD | cDAT | cIEN;
376 i++; /* cLEN, gets filled in below */
378 *(__le32 *)(buf+i) = cpu_to_le32(pkt_dma); /* cNCPB */
380 i += 4; /* cPRD, gets filled in below */
382 buf[i++] = 0; /* reserved */
383 buf[i++] = 0; /* reserved */
384 buf[i++] = 0; /* reserved */
385 buf[i++] = 0; /* reserved */
387 /* ATA registers; must be a multiple of 4 */
388 buf[i++] = qc->tf.device;
389 buf[i++] = ADMA_REGS_DEVICE;
390 if ((qc->tf.flags & ATA_TFLAG_LBA48)) {
391 buf[i++] = qc->tf.hob_nsect;
392 buf[i++] = ADMA_REGS_SECTOR_COUNT;
393 buf[i++] = qc->tf.hob_lbal;
394 buf[i++] = ADMA_REGS_LBA_LOW;
395 buf[i++] = qc->tf.hob_lbam;
396 buf[i++] = ADMA_REGS_LBA_MID;
397 buf[i++] = qc->tf.hob_lbah;
398 buf[i++] = ADMA_REGS_LBA_HIGH;
400 buf[i++] = qc->tf.nsect;
401 buf[i++] = ADMA_REGS_SECTOR_COUNT;
402 buf[i++] = qc->tf.lbal;
403 buf[i++] = ADMA_REGS_LBA_LOW;
404 buf[i++] = qc->tf.lbam;
405 buf[i++] = ADMA_REGS_LBA_MID;
406 buf[i++] = qc->tf.lbah;
407 buf[i++] = ADMA_REGS_LBA_HIGH;
409 buf[i++] = ADMA_REGS_CONTROL;
412 buf[i++] = qc->tf.command;
413 buf[i++] = ADMA_REGS_COMMAND | rEND;
415 buf[3] = (i >> 3) - 2; /* cLEN */
416 *(__le32 *)(buf+8) = cpu_to_le32(pkt_dma + i); /* cPRD */
418 i = adma_fill_sg(qc);
419 wmb(); /* flush PRDs and pkt to memory */
421 /* dump out CPB + PRDs for debug */
424 static char obuf[2048];
425 for (j = 0; j < i; ++j) {
426 len += sprintf(obuf+len, "%02x ", buf[j]);
428 printk("%s\n", obuf);
433 printk("%s\n", obuf);
438 static inline void adma_packet_start(struct ata_queued_cmd *qc)
440 struct ata_port *ap = qc->ap;
441 void __iomem *chan = ADMA_PORT_REGS(ap);
443 VPRINTK("ENTER, ap %p\n", ap);
445 /* fire up the ADMA engine */
446 writew(aPIOMD4 | aGO, chan + ADMA_CONTROL);
449 static unsigned int adma_qc_issue(struct ata_queued_cmd *qc)
451 struct adma_port_priv *pp = qc->ap->private_data;
453 switch (qc->tf.protocol) {
455 pp->state = adma_state_pkt;
456 adma_packet_start(qc);
467 pp->state = adma_state_mmio;
468 return ata_qc_issue_prot(qc);
471 static inline unsigned int adma_intr_pkt(struct ata_host *host)
473 unsigned int handled = 0, port_no;
475 for (port_no = 0; port_no < host->n_ports; ++port_no) {
476 struct ata_port *ap = host->ports[port_no];
477 struct adma_port_priv *pp;
478 struct ata_queued_cmd *qc;
479 void __iomem *chan = ADMA_PORT_REGS(ap);
480 u8 status = readb(chan + ADMA_STATUS);
485 adma_enter_reg_mode(ap);
486 if (ap->flags & ATA_FLAG_DISABLED)
488 pp = ap->private_data;
489 if (!pp || pp->state != adma_state_pkt)
491 qc = ata_qc_from_tag(ap, ap->link.active_tag);
492 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
494 qc->err_mask |= AC_ERR_HOST_BUS;
495 else if ((status & (aPSD | aUIRQ)))
496 qc->err_mask |= AC_ERR_OTHER;
498 if (pp->pkt[0] & cATERR)
499 qc->err_mask |= AC_ERR_DEV;
500 else if (pp->pkt[0] != cDONE)
501 qc->err_mask |= AC_ERR_OTHER;
506 struct ata_eh_info *ehi = &ap->link.eh_info;
507 ata_ehi_clear_desc(ehi);
508 ata_ehi_push_desc(ehi,
509 "ADMA-status 0x%02X", status);
510 ata_ehi_push_desc(ehi,
511 "pkt[0] 0x%02X", pp->pkt[0]);
513 if (qc->err_mask == AC_ERR_DEV)
523 static inline unsigned int adma_intr_mmio(struct ata_host *host)
525 unsigned int handled = 0, port_no;
527 for (port_no = 0; port_no < host->n_ports; ++port_no) {
529 ap = host->ports[port_no];
530 if (ap && (!(ap->flags & ATA_FLAG_DISABLED))) {
531 struct ata_queued_cmd *qc;
532 struct adma_port_priv *pp = ap->private_data;
533 if (!pp || pp->state != adma_state_mmio)
535 qc = ata_qc_from_tag(ap, ap->link.active_tag);
536 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
538 /* check main status, clearing INTRQ */
539 u8 status = ata_check_status(ap);
540 if ((status & ATA_BUSY))
542 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
543 ap->print_id, qc->tf.protocol, status);
545 /* complete taskfile transaction */
546 pp->state = adma_state_idle;
547 qc->err_mask |= ac_err_mask(status);
551 struct ata_eh_info *ehi =
553 ata_ehi_clear_desc(ehi);
554 ata_ehi_push_desc(ehi,
555 "status 0x%02X", status);
557 if (qc->err_mask == AC_ERR_DEV)
569 static irqreturn_t adma_intr(int irq, void *dev_instance)
571 struct ata_host *host = dev_instance;
572 unsigned int handled = 0;
576 spin_lock(&host->lock);
577 handled = adma_intr_pkt(host) | adma_intr_mmio(host);
578 spin_unlock(&host->lock);
582 return IRQ_RETVAL(handled);
585 static void adma_ata_setup_port(struct ata_ioports *port, void __iomem *base)
588 port->data_addr = base + 0x000;
590 port->feature_addr = base + 0x004;
591 port->nsect_addr = base + 0x008;
592 port->lbal_addr = base + 0x00c;
593 port->lbam_addr = base + 0x010;
594 port->lbah_addr = base + 0x014;
595 port->device_addr = base + 0x018;
597 port->command_addr = base + 0x01c;
598 port->altstatus_addr =
599 port->ctl_addr = base + 0x038;
602 static int adma_port_start(struct ata_port *ap)
604 struct device *dev = ap->host->dev;
605 struct adma_port_priv *pp;
608 rc = ata_port_start(ap);
611 adma_enter_reg_mode(ap);
612 pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
615 pp->pkt = dmam_alloc_coherent(dev, ADMA_PKT_BYTES, &pp->pkt_dma,
620 if ((pp->pkt_dma & 7) != 0) {
621 printk(KERN_ERR "bad alignment for pp->pkt_dma: %08x\n",
625 memset(pp->pkt, 0, ADMA_PKT_BYTES);
626 ap->private_data = pp;
627 adma_reinit_engine(ap);
631 static void adma_port_stop(struct ata_port *ap)
633 adma_reset_engine(ap);
636 static void adma_host_stop(struct ata_host *host)
638 unsigned int port_no;
640 for (port_no = 0; port_no < ADMA_PORTS; ++port_no)
641 adma_reset_engine(host->ports[port_no]);
644 static void adma_host_init(struct ata_host *host, unsigned int chip_id)
646 unsigned int port_no;
648 /* enable/lock aGO operation */
649 writeb(7, host->iomap[ADMA_MMIO_BAR] + ADMA_MODE_LOCK);
651 /* reset the ADMA logic */
652 for (port_no = 0; port_no < ADMA_PORTS; ++port_no)
653 adma_reset_engine(host->ports[port_no]);
656 static int adma_set_dma_masks(struct pci_dev *pdev, void __iomem *mmio_base)
660 rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
662 dev_printk(KERN_ERR, &pdev->dev,
663 "32-bit DMA enable failed\n");
666 rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
668 dev_printk(KERN_ERR, &pdev->dev,
669 "32-bit consistent DMA enable failed\n");
675 static int adma_ata_init_one(struct pci_dev *pdev,
676 const struct pci_device_id *ent)
678 static int printed_version;
679 unsigned int board_idx = (unsigned int) ent->driver_data;
680 const struct ata_port_info *ppi[] = { &adma_port_info[board_idx], NULL };
681 struct ata_host *host;
682 void __iomem *mmio_base;
685 if (!printed_version++)
686 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
689 host = ata_host_alloc_pinfo(&pdev->dev, ppi, ADMA_PORTS);
693 /* acquire resources and fill host */
694 rc = pcim_enable_device(pdev);
698 if ((pci_resource_flags(pdev, 4) & IORESOURCE_MEM) == 0)
701 rc = pcim_iomap_regions(pdev, 1 << ADMA_MMIO_BAR, DRV_NAME);
704 host->iomap = pcim_iomap_table(pdev);
705 mmio_base = host->iomap[ADMA_MMIO_BAR];
707 rc = adma_set_dma_masks(pdev, mmio_base);
711 for (port_no = 0; port_no < ADMA_PORTS; ++port_no) {
712 struct ata_port *ap = host->ports[port_no];
713 void __iomem *port_base = ADMA_ATA_REGS(mmio_base, port_no);
714 unsigned int offset = port_base - mmio_base;
716 adma_ata_setup_port(&ap->ioaddr, port_base);
718 ata_port_pbar_desc(ap, ADMA_MMIO_BAR, -1, "mmio");
719 ata_port_pbar_desc(ap, ADMA_MMIO_BAR, offset, "port");
722 /* initialize adapter */
723 adma_host_init(host, board_idx);
725 pci_set_master(pdev);
726 return ata_host_activate(host, pdev->irq, adma_intr, IRQF_SHARED,
730 static int __init adma_ata_init(void)
732 return pci_register_driver(&adma_ata_pci_driver);
735 static void __exit adma_ata_exit(void)
737 pci_unregister_driver(&adma_ata_pci_driver);
740 MODULE_AUTHOR("Mark Lord");
741 MODULE_DESCRIPTION("Pacific Digital Corporation ADMA low-level driver");
742 MODULE_LICENSE("GPL");
743 MODULE_DEVICE_TABLE(pci, adma_ata_pci_tbl);
744 MODULE_VERSION(DRV_VERSION);
746 module_init(adma_ata_init);
747 module_exit(adma_ata_exit);