2 * sata_svw.c - ServerWorks / Apple K2 SATA
4 * Maintained by: Benjamin Herrenschmidt <benh@kernel.crashing.org> and
5 * Jeff Garzik <jgarzik@pobox.com>
6 * Please ALWAYS copy linux-ide@vger.kernel.org
9 * Copyright 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>
11 * Bits from Jeff Garzik, Copyright RedHat, Inc.
13 * This driver probably works with non-Apple versions of the
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2, or (at your option)
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
27 * You should have received a copy of the GNU General Public License
28 * along with this program; see the file COPYING. If not, write to
29 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
32 * libata documentation is available via 'make {ps|pdf}docs',
33 * as Documentation/DocBook/libata.*
35 * Hardware documentation available under NDA.
39 #include <linux/kernel.h>
40 #include <linux/module.h>
41 #include <linux/pci.h>
42 #include <linux/init.h>
43 #include <linux/blkdev.h>
44 #include <linux/delay.h>
45 #include <linux/interrupt.h>
46 #include <linux/device.h>
47 #include <scsi/scsi_host.h>
48 #include <scsi/scsi_cmnd.h>
49 #include <scsi/scsi.h>
50 #include <linux/libata.h>
54 #include <asm/pci-bridge.h>
55 #endif /* CONFIG_PPC_OF */
57 #define DRV_NAME "sata_svw"
58 #define DRV_VERSION "2.3"
62 K2_FLAG_SATA_8_PORTS = (1 << 24),
63 K2_FLAG_NO_ATAPI_DMA = (1 << 25),
64 K2_FLAG_BAR_POS_3 = (1 << 26),
66 /* Taskfile registers offsets */
67 K2_SATA_TF_CMD_OFFSET = 0x00,
68 K2_SATA_TF_DATA_OFFSET = 0x00,
69 K2_SATA_TF_ERROR_OFFSET = 0x04,
70 K2_SATA_TF_NSECT_OFFSET = 0x08,
71 K2_SATA_TF_LBAL_OFFSET = 0x0c,
72 K2_SATA_TF_LBAM_OFFSET = 0x10,
73 K2_SATA_TF_LBAH_OFFSET = 0x14,
74 K2_SATA_TF_DEVICE_OFFSET = 0x18,
75 K2_SATA_TF_CMDSTAT_OFFSET = 0x1c,
76 K2_SATA_TF_CTL_OFFSET = 0x20,
79 K2_SATA_DMA_CMD_OFFSET = 0x30,
82 K2_SATA_SCR_STATUS_OFFSET = 0x40,
83 K2_SATA_SCR_ERROR_OFFSET = 0x44,
84 K2_SATA_SCR_CONTROL_OFFSET = 0x48,
87 K2_SATA_SICR1_OFFSET = 0x80,
88 K2_SATA_SICR2_OFFSET = 0x84,
89 K2_SATA_SIM_OFFSET = 0x88,
92 K2_SATA_PORT_OFFSET = 0x100,
96 chip_svw42 = 2, /* bar 3 */
97 chip_svw43 = 3, /* bar 5 */
100 static u8 k2_stat_check_status(struct ata_port *ap);
103 static int k2_sata_check_atapi_dma(struct ata_queued_cmd *qc)
105 u8 cmnd = qc->scsicmd->cmnd[0];
107 if (qc->ap->flags & K2_FLAG_NO_ATAPI_DMA)
108 return -1; /* ATAPI DMA not supported */
126 static int k2_sata_scr_read(struct ata_link *link,
127 unsigned int sc_reg, u32 *val)
129 if (sc_reg > SCR_CONTROL)
131 *val = readl(link->ap->ioaddr.scr_addr + (sc_reg * 4));
136 static int k2_sata_scr_write(struct ata_link *link,
137 unsigned int sc_reg, u32 val)
139 if (sc_reg > SCR_CONTROL)
141 writel(val, link->ap->ioaddr.scr_addr + (sc_reg * 4));
145 static int k2_sata_softreset(struct ata_link *link,
146 unsigned int *class, unsigned long deadline)
149 void __iomem *mmio = link->ap->ioaddr.bmdma_addr;
151 dmactl = readb(mmio + ATA_DMA_CMD);
153 /* Clear the start bit */
154 if (dmactl & ATA_DMA_START) {
155 dmactl &= ~ATA_DMA_START;
156 writeb(dmactl, mmio + ATA_DMA_CMD);
159 return ata_sff_softreset(link, class, deadline);
162 static int k2_sata_hardreset(struct ata_link *link,
163 unsigned int *class, unsigned long deadline)
166 void __iomem *mmio = link->ap->ioaddr.bmdma_addr;
168 dmactl = readb(mmio + ATA_DMA_CMD);
170 /* Clear the start bit */
171 if (dmactl & ATA_DMA_START) {
172 dmactl &= ~ATA_DMA_START;
173 writeb(dmactl, mmio + ATA_DMA_CMD);
176 return sata_sff_hardreset(link, class, deadline);
179 static void k2_sata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
181 struct ata_ioports *ioaddr = &ap->ioaddr;
182 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
184 if (tf->ctl != ap->last_ctl) {
185 writeb(tf->ctl, ioaddr->ctl_addr);
186 ap->last_ctl = tf->ctl;
189 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
190 writew(tf->feature | (((u16)tf->hob_feature) << 8),
191 ioaddr->feature_addr);
192 writew(tf->nsect | (((u16)tf->hob_nsect) << 8),
194 writew(tf->lbal | (((u16)tf->hob_lbal) << 8),
196 writew(tf->lbam | (((u16)tf->hob_lbam) << 8),
198 writew(tf->lbah | (((u16)tf->hob_lbah) << 8),
200 } else if (is_addr) {
201 writew(tf->feature, ioaddr->feature_addr);
202 writew(tf->nsect, ioaddr->nsect_addr);
203 writew(tf->lbal, ioaddr->lbal_addr);
204 writew(tf->lbam, ioaddr->lbam_addr);
205 writew(tf->lbah, ioaddr->lbah_addr);
208 if (tf->flags & ATA_TFLAG_DEVICE)
209 writeb(tf->device, ioaddr->device_addr);
215 static void k2_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
217 struct ata_ioports *ioaddr = &ap->ioaddr;
218 u16 nsect, lbal, lbam, lbah, feature;
220 tf->command = k2_stat_check_status(ap);
221 tf->device = readw(ioaddr->device_addr);
222 feature = readw(ioaddr->error_addr);
223 nsect = readw(ioaddr->nsect_addr);
224 lbal = readw(ioaddr->lbal_addr);
225 lbam = readw(ioaddr->lbam_addr);
226 lbah = readw(ioaddr->lbah_addr);
228 tf->feature = feature;
234 if (tf->flags & ATA_TFLAG_LBA48) {
235 tf->hob_feature = feature >> 8;
236 tf->hob_nsect = nsect >> 8;
237 tf->hob_lbal = lbal >> 8;
238 tf->hob_lbam = lbam >> 8;
239 tf->hob_lbah = lbah >> 8;
244 * k2_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction (MMIO)
245 * @qc: Info associated with this ATA transaction.
248 * spin_lock_irqsave(host lock)
251 static void k2_bmdma_setup_mmio(struct ata_queued_cmd *qc)
253 struct ata_port *ap = qc->ap;
254 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
256 void __iomem *mmio = ap->ioaddr.bmdma_addr;
258 /* load PRD table addr. */
259 mb(); /* make sure PRD table writes are visible to controller */
260 writel(ap->bmdma_prd_dma, mmio + ATA_DMA_TABLE_OFS);
262 /* specify data direction, triple-check start bit is clear */
263 dmactl = readb(mmio + ATA_DMA_CMD);
264 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
266 dmactl |= ATA_DMA_WR;
267 writeb(dmactl, mmio + ATA_DMA_CMD);
269 /* issue r/w command if this is not a ATA DMA command*/
270 if (qc->tf.protocol != ATA_PROT_DMA)
271 ap->ops->sff_exec_command(ap, &qc->tf);
275 * k2_bmdma_start_mmio - Start a PCI IDE BMDMA transaction (MMIO)
276 * @qc: Info associated with this ATA transaction.
279 * spin_lock_irqsave(host lock)
282 static void k2_bmdma_start_mmio(struct ata_queued_cmd *qc)
284 struct ata_port *ap = qc->ap;
285 void __iomem *mmio = ap->ioaddr.bmdma_addr;
288 /* start host DMA transaction */
289 dmactl = readb(mmio + ATA_DMA_CMD);
290 writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
291 /* This works around possible data corruption.
293 On certain SATA controllers that can be seen when the r/w
294 command is given to the controller before the host DMA is
297 On a Read command, the controller would initiate the
298 command to the drive even before it sees the DMA
299 start. When there are very fast drives connected to the
300 controller, or when the data request hits in the drive
301 cache, there is the possibility that the drive returns a
302 part or all of the requested data to the controller before
303 the DMA start is issued. In this case, the controller
304 would become confused as to what to do with the data. In
305 the worst case when all the data is returned back to the
306 controller, the controller could hang. In other cases it
307 could return partial data returning in data
308 corruption. This problem has been seen in PPC systems and
309 can also appear on an system with very fast disks, where
310 the SATA controller is sitting behind a number of bridges,
311 and hence there is significant latency between the r/w
312 command and the start command. */
313 /* issue r/w command if the access is to ATA */
314 if (qc->tf.protocol == ATA_PROT_DMA)
315 ap->ops->sff_exec_command(ap, &qc->tf);
319 static u8 k2_stat_check_status(struct ata_port *ap)
321 return readl(ap->ioaddr.status_addr);
325 static int k2_sata_show_info(struct seq_file *m, struct Scsi_Host *shost)
328 struct device_node *np;
331 /* Find the ata_port */
332 ap = ata_shost_to_port(shost);
336 /* Find the OF node for the PCI device proper */
337 np = pci_device_to_OF_node(to_pci_dev(ap->host->dev));
341 /* Match it to a port node */
342 index = (ap == ap->host->ports[0]) ? 0 : 1;
343 for (np = np->child; np != NULL; np = np->sibling) {
344 const u32 *reg = of_get_property(np, "reg", NULL);
348 seq_printf(m, "devspec: %s\n", np->full_name);
354 #endif /* CONFIG_PPC_OF */
357 static struct scsi_host_template k2_sata_sht = {
358 ATA_BMDMA_SHT(DRV_NAME),
360 .show_info = k2_sata_show_info,
365 static struct ata_port_operations k2_sata_ops = {
366 .inherits = &ata_bmdma_port_ops,
367 .softreset = k2_sata_softreset,
368 .hardreset = k2_sata_hardreset,
369 .sff_tf_load = k2_sata_tf_load,
370 .sff_tf_read = k2_sata_tf_read,
371 .sff_check_status = k2_stat_check_status,
372 .check_atapi_dma = k2_sata_check_atapi_dma,
373 .bmdma_setup = k2_bmdma_setup_mmio,
374 .bmdma_start = k2_bmdma_start_mmio,
375 .scr_read = k2_sata_scr_read,
376 .scr_write = k2_sata_scr_write,
379 static const struct ata_port_info k2_port_info[] = {
382 .flags = ATA_FLAG_SATA | K2_FLAG_NO_ATAPI_DMA,
383 .pio_mask = ATA_PIO4,
384 .mwdma_mask = ATA_MWDMA2,
385 .udma_mask = ATA_UDMA6,
386 .port_ops = &k2_sata_ops,
390 .flags = ATA_FLAG_SATA | K2_FLAG_NO_ATAPI_DMA |
391 K2_FLAG_SATA_8_PORTS,
392 .pio_mask = ATA_PIO4,
393 .mwdma_mask = ATA_MWDMA2,
394 .udma_mask = ATA_UDMA6,
395 .port_ops = &k2_sata_ops,
399 .flags = ATA_FLAG_SATA | K2_FLAG_BAR_POS_3,
400 .pio_mask = ATA_PIO4,
401 .mwdma_mask = ATA_MWDMA2,
402 .udma_mask = ATA_UDMA6,
403 .port_ops = &k2_sata_ops,
407 .flags = ATA_FLAG_SATA,
408 .pio_mask = ATA_PIO4,
409 .mwdma_mask = ATA_MWDMA2,
410 .udma_mask = ATA_UDMA6,
411 .port_ops = &k2_sata_ops,
415 static void k2_sata_setup_port(struct ata_ioports *port, void __iomem *base)
417 port->cmd_addr = base + K2_SATA_TF_CMD_OFFSET;
418 port->data_addr = base + K2_SATA_TF_DATA_OFFSET;
420 port->error_addr = base + K2_SATA_TF_ERROR_OFFSET;
421 port->nsect_addr = base + K2_SATA_TF_NSECT_OFFSET;
422 port->lbal_addr = base + K2_SATA_TF_LBAL_OFFSET;
423 port->lbam_addr = base + K2_SATA_TF_LBAM_OFFSET;
424 port->lbah_addr = base + K2_SATA_TF_LBAH_OFFSET;
425 port->device_addr = base + K2_SATA_TF_DEVICE_OFFSET;
427 port->status_addr = base + K2_SATA_TF_CMDSTAT_OFFSET;
428 port->altstatus_addr =
429 port->ctl_addr = base + K2_SATA_TF_CTL_OFFSET;
430 port->bmdma_addr = base + K2_SATA_DMA_CMD_OFFSET;
431 port->scr_addr = base + K2_SATA_SCR_STATUS_OFFSET;
435 static int k2_sata_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
437 const struct ata_port_info *ppi[] =
438 { &k2_port_info[ent->driver_data], NULL };
439 struct ata_host *host;
440 void __iomem *mmio_base;
441 int n_ports, i, rc, bar_pos;
443 ata_print_version_once(&pdev->dev, DRV_VERSION);
447 if (ppi[0]->flags & K2_FLAG_SATA_8_PORTS)
450 host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
455 if (ppi[0]->flags & K2_FLAG_BAR_POS_3)
458 * If this driver happens to only be useful on Apple's K2, then
459 * we should check that here as it has a normal Serverworks ID
461 rc = pcim_enable_device(pdev);
466 * Check if we have resources mapped at all (second function may
467 * have been disabled by firmware)
469 if (pci_resource_len(pdev, bar_pos) == 0) {
470 /* In IDE mode we need to pin the device to ensure that
471 pcim_release does not clear the busmaster bit in config
472 space, clearing causes busmaster DMA to fail on
474 pcim_pin_device(pdev);
478 /* Request and iomap PCI regions */
479 rc = pcim_iomap_regions(pdev, 1 << bar_pos, DRV_NAME);
481 pcim_pin_device(pdev);
484 host->iomap = pcim_iomap_table(pdev);
485 mmio_base = host->iomap[bar_pos];
487 /* different controllers have different number of ports - currently 4 or 8 */
488 /* All ports are on the same function. Multi-function device is no
489 * longer available. This should not be seen in any system. */
490 for (i = 0; i < host->n_ports; i++) {
491 struct ata_port *ap = host->ports[i];
492 unsigned int offset = i * K2_SATA_PORT_OFFSET;
494 k2_sata_setup_port(&ap->ioaddr, mmio_base + offset);
496 ata_port_pbar_desc(ap, 5, -1, "mmio");
497 ata_port_pbar_desc(ap, 5, offset, "port");
500 rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
503 rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
507 /* Clear a magic bit in SCR1 according to Darwin, those help
508 * some funky seagate drives (though so far, those were already
509 * set by the firmware on the machines I had access to)
511 writel(readl(mmio_base + K2_SATA_SICR1_OFFSET) & ~0x00040000,
512 mmio_base + K2_SATA_SICR1_OFFSET);
514 /* Clear SATA error & interrupts we don't use */
515 writel(0xffffffff, mmio_base + K2_SATA_SCR_ERROR_OFFSET);
516 writel(0x0, mmio_base + K2_SATA_SIM_OFFSET);
518 pci_set_master(pdev);
519 return ata_host_activate(host, pdev->irq, ata_bmdma_interrupt,
520 IRQF_SHARED, &k2_sata_sht);
523 /* 0x240 is device ID for Apple K2 device
524 * 0x241 is device ID for Serverworks Frodo4
525 * 0x242 is device ID for Serverworks Frodo8
526 * 0x24a is device ID for BCM5785 (aka HT1000) HT southbridge integrated SATA
529 static const struct pci_device_id k2_sata_pci_tbl[] = {
530 { PCI_VDEVICE(SERVERWORKS, 0x0240), chip_svw4 },
531 { PCI_VDEVICE(SERVERWORKS, 0x0241), chip_svw8 },
532 { PCI_VDEVICE(SERVERWORKS, 0x0242), chip_svw4 },
533 { PCI_VDEVICE(SERVERWORKS, 0x024a), chip_svw4 },
534 { PCI_VDEVICE(SERVERWORKS, 0x024b), chip_svw4 },
535 { PCI_VDEVICE(SERVERWORKS, 0x0410), chip_svw42 },
536 { PCI_VDEVICE(SERVERWORKS, 0x0411), chip_svw43 },
541 static struct pci_driver k2_sata_pci_driver = {
543 .id_table = k2_sata_pci_tbl,
544 .probe = k2_sata_init_one,
545 .remove = ata_pci_remove_one,
548 module_pci_driver(k2_sata_pci_driver);
550 MODULE_AUTHOR("Benjamin Herrenschmidt");
551 MODULE_DESCRIPTION("low-level driver for K2 SATA controller");
552 MODULE_LICENSE("GPL");
553 MODULE_DEVICE_TABLE(pci, k2_sata_pci_tbl);
554 MODULE_VERSION(DRV_VERSION);