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_port *ap, unsigned int sc_reg, u32 *val)
128 if (sc_reg > SCR_CONTROL)
130 *val = readl(ap->ioaddr.scr_addr + (sc_reg * 4));
135 static int k2_sata_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
137 if (sc_reg > SCR_CONTROL)
139 writel(val, ap->ioaddr.scr_addr + (sc_reg * 4));
144 static void k2_sata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
146 struct ata_ioports *ioaddr = &ap->ioaddr;
147 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
149 if (tf->ctl != ap->last_ctl) {
150 writeb(tf->ctl, ioaddr->ctl_addr);
151 ap->last_ctl = tf->ctl;
154 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
155 writew(tf->feature | (((u16)tf->hob_feature) << 8),
156 ioaddr->feature_addr);
157 writew(tf->nsect | (((u16)tf->hob_nsect) << 8),
159 writew(tf->lbal | (((u16)tf->hob_lbal) << 8),
161 writew(tf->lbam | (((u16)tf->hob_lbam) << 8),
163 writew(tf->lbah | (((u16)tf->hob_lbah) << 8),
165 } else if (is_addr) {
166 writew(tf->feature, ioaddr->feature_addr);
167 writew(tf->nsect, ioaddr->nsect_addr);
168 writew(tf->lbal, ioaddr->lbal_addr);
169 writew(tf->lbam, ioaddr->lbam_addr);
170 writew(tf->lbah, ioaddr->lbah_addr);
173 if (tf->flags & ATA_TFLAG_DEVICE)
174 writeb(tf->device, ioaddr->device_addr);
180 static void k2_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
182 struct ata_ioports *ioaddr = &ap->ioaddr;
183 u16 nsect, lbal, lbam, lbah, feature;
185 tf->command = k2_stat_check_status(ap);
186 tf->device = readw(ioaddr->device_addr);
187 feature = readw(ioaddr->error_addr);
188 nsect = readw(ioaddr->nsect_addr);
189 lbal = readw(ioaddr->lbal_addr);
190 lbam = readw(ioaddr->lbam_addr);
191 lbah = readw(ioaddr->lbah_addr);
193 tf->feature = feature;
199 if (tf->flags & ATA_TFLAG_LBA48) {
200 tf->hob_feature = feature >> 8;
201 tf->hob_nsect = nsect >> 8;
202 tf->hob_lbal = lbal >> 8;
203 tf->hob_lbam = lbam >> 8;
204 tf->hob_lbah = lbah >> 8;
209 * k2_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction (MMIO)
210 * @qc: Info associated with this ATA transaction.
213 * spin_lock_irqsave(host lock)
216 static void k2_bmdma_setup_mmio(struct ata_queued_cmd *qc)
218 struct ata_port *ap = qc->ap;
219 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
221 void __iomem *mmio = ap->ioaddr.bmdma_addr;
223 /* load PRD table addr. */
224 mb(); /* make sure PRD table writes are visible to controller */
225 writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
227 /* specify data direction, triple-check start bit is clear */
228 dmactl = readb(mmio + ATA_DMA_CMD);
229 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
231 dmactl |= ATA_DMA_WR;
232 writeb(dmactl, mmio + ATA_DMA_CMD);
234 /* issue r/w command if this is not a ATA DMA command*/
235 if (qc->tf.protocol != ATA_PROT_DMA)
236 ap->ops->sff_exec_command(ap, &qc->tf);
240 * k2_bmdma_start_mmio - Start a PCI IDE BMDMA transaction (MMIO)
241 * @qc: Info associated with this ATA transaction.
244 * spin_lock_irqsave(host lock)
247 static void k2_bmdma_start_mmio(struct ata_queued_cmd *qc)
249 struct ata_port *ap = qc->ap;
250 void __iomem *mmio = ap->ioaddr.bmdma_addr;
253 /* start host DMA transaction */
254 dmactl = readb(mmio + ATA_DMA_CMD);
255 writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
256 /* This works around possible data corruption.
258 On certain SATA controllers that can be seen when the r/w
259 command is given to the controller before the host DMA is
262 On a Read command, the controller would initiate the
263 command to the drive even before it sees the DMA
264 start. When there are very fast drives connected to the
265 controller, or when the data request hits in the drive
266 cache, there is the possibility that the drive returns a
267 part or all of the requested data to the controller before
268 the DMA start is issued. In this case, the controller
269 would become confused as to what to do with the data. In
270 the worst case when all the data is returned back to the
271 controller, the controller could hang. In other cases it
272 could return partial data returning in data
273 corruption. This problem has been seen in PPC systems and
274 can also appear on an system with very fast disks, where
275 the SATA controller is sitting behind a number of bridges,
276 and hence there is significant latency between the r/w
277 command and the start command. */
278 /* issue r/w command if the access is to ATA */
279 if (qc->tf.protocol == ATA_PROT_DMA)
280 ap->ops->sff_exec_command(ap, &qc->tf);
284 static u8 k2_stat_check_status(struct ata_port *ap)
286 return readl(ap->ioaddr.status_addr);
292 * inout : decides on the direction of the dataflow and the meaning of the
294 * buffer: If inout==FALSE data is being written to it else read from it
295 * *start: If inout==FALSE start of the valid data in the buffer
296 * offset: If inout==FALSE offset from the beginning of the imaginary file
297 * from which we start writing into the buffer
298 * length: If inout==FALSE max number of bytes to be written into the buffer
299 * else number of bytes in the buffer
301 static int k2_sata_proc_info(struct Scsi_Host *shost, char *page, char **start,
302 off_t offset, int count, int inout)
305 struct device_node *np;
308 /* Find the ata_port */
309 ap = ata_shost_to_port(shost);
313 /* Find the OF node for the PCI device proper */
314 np = pci_device_to_OF_node(to_pci_dev(ap->host->dev));
318 /* Match it to a port node */
319 index = (ap == ap->host->ports[0]) ? 0 : 1;
320 for (np = np->child; np != NULL; np = np->sibling) {
321 const u32 *reg = of_get_property(np, "reg", NULL);
330 len = sprintf(page, "devspec: %s\n", np->full_name);
334 #endif /* CONFIG_PPC_OF */
337 static struct scsi_host_template k2_sata_sht = {
338 ATA_BMDMA_SHT(DRV_NAME),
340 .proc_info = k2_sata_proc_info,
345 static struct ata_port_operations k2_sata_ops = {
346 .inherits = &ata_bmdma_port_ops,
347 .sff_tf_load = k2_sata_tf_load,
348 .sff_tf_read = k2_sata_tf_read,
349 .sff_check_status = k2_stat_check_status,
350 .check_atapi_dma = k2_sata_check_atapi_dma,
351 .bmdma_setup = k2_bmdma_setup_mmio,
352 .bmdma_start = k2_bmdma_start_mmio,
353 .scr_read = k2_sata_scr_read,
354 .scr_write = k2_sata_scr_write,
357 static const struct ata_port_info k2_port_info[] = {
360 .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
361 ATA_FLAG_MMIO | K2_FLAG_NO_ATAPI_DMA,
364 .udma_mask = ATA_UDMA6,
365 .port_ops = &k2_sata_ops,
369 .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
370 ATA_FLAG_MMIO | K2_FLAG_NO_ATAPI_DMA |
371 K2_FLAG_SATA_8_PORTS,
374 .udma_mask = ATA_UDMA6,
375 .port_ops = &k2_sata_ops,
379 .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
380 ATA_FLAG_MMIO | K2_FLAG_BAR_POS_3,
383 .udma_mask = ATA_UDMA6,
384 .port_ops = &k2_sata_ops,
388 .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
392 .udma_mask = ATA_UDMA6,
393 .port_ops = &k2_sata_ops,
397 static void k2_sata_setup_port(struct ata_ioports *port, void __iomem *base)
399 port->cmd_addr = base + K2_SATA_TF_CMD_OFFSET;
400 port->data_addr = base + K2_SATA_TF_DATA_OFFSET;
402 port->error_addr = base + K2_SATA_TF_ERROR_OFFSET;
403 port->nsect_addr = base + K2_SATA_TF_NSECT_OFFSET;
404 port->lbal_addr = base + K2_SATA_TF_LBAL_OFFSET;
405 port->lbam_addr = base + K2_SATA_TF_LBAM_OFFSET;
406 port->lbah_addr = base + K2_SATA_TF_LBAH_OFFSET;
407 port->device_addr = base + K2_SATA_TF_DEVICE_OFFSET;
409 port->status_addr = base + K2_SATA_TF_CMDSTAT_OFFSET;
410 port->altstatus_addr =
411 port->ctl_addr = base + K2_SATA_TF_CTL_OFFSET;
412 port->bmdma_addr = base + K2_SATA_DMA_CMD_OFFSET;
413 port->scr_addr = base + K2_SATA_SCR_STATUS_OFFSET;
417 static int k2_sata_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
419 static int printed_version;
420 const struct ata_port_info *ppi[] =
421 { &k2_port_info[ent->driver_data], NULL };
422 struct ata_host *host;
423 void __iomem *mmio_base;
424 int n_ports, i, rc, bar_pos;
426 if (!printed_version++)
427 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
431 if (ppi[0]->flags & K2_FLAG_SATA_8_PORTS)
434 host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
439 if (ppi[0]->flags & K2_FLAG_BAR_POS_3)
442 * If this driver happens to only be useful on Apple's K2, then
443 * we should check that here as it has a normal Serverworks ID
445 rc = pcim_enable_device(pdev);
450 * Check if we have resources mapped at all (second function may
451 * have been disabled by firmware)
453 if (pci_resource_len(pdev, bar_pos) == 0) {
454 /* In IDE mode we need to pin the device to ensure that
455 pcim_release does not clear the busmaster bit in config
456 space, clearing causes busmaster DMA to fail on
458 pcim_pin_device(pdev);
462 /* Request and iomap PCI regions */
463 rc = pcim_iomap_regions(pdev, 1 << bar_pos, DRV_NAME);
465 pcim_pin_device(pdev);
468 host->iomap = pcim_iomap_table(pdev);
469 mmio_base = host->iomap[bar_pos];
471 /* different controllers have different number of ports - currently 4 or 8 */
472 /* All ports are on the same function. Multi-function device is no
473 * longer available. This should not be seen in any system. */
474 for (i = 0; i < host->n_ports; i++) {
475 struct ata_port *ap = host->ports[i];
476 unsigned int offset = i * K2_SATA_PORT_OFFSET;
478 k2_sata_setup_port(&ap->ioaddr, mmio_base + offset);
480 ata_port_pbar_desc(ap, 5, -1, "mmio");
481 ata_port_pbar_desc(ap, 5, offset, "port");
484 rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
487 rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
491 /* Clear a magic bit in SCR1 according to Darwin, those help
492 * some funky seagate drives (though so far, those were already
493 * set by the firmware on the machines I had access to)
495 writel(readl(mmio_base + K2_SATA_SICR1_OFFSET) & ~0x00040000,
496 mmio_base + K2_SATA_SICR1_OFFSET);
498 /* Clear SATA error & interrupts we don't use */
499 writel(0xffffffff, mmio_base + K2_SATA_SCR_ERROR_OFFSET);
500 writel(0x0, mmio_base + K2_SATA_SIM_OFFSET);
502 pci_set_master(pdev);
503 return ata_host_activate(host, pdev->irq, ata_sff_interrupt,
504 IRQF_SHARED, &k2_sata_sht);
507 /* 0x240 is device ID for Apple K2 device
508 * 0x241 is device ID for Serverworks Frodo4
509 * 0x242 is device ID for Serverworks Frodo8
510 * 0x24a is device ID for BCM5785 (aka HT1000) HT southbridge integrated SATA
513 static const struct pci_device_id k2_sata_pci_tbl[] = {
514 { PCI_VDEVICE(SERVERWORKS, 0x0240), chip_svw4 },
515 { PCI_VDEVICE(SERVERWORKS, 0x0241), chip_svw8 },
516 { PCI_VDEVICE(SERVERWORKS, 0x0242), chip_svw4 },
517 { PCI_VDEVICE(SERVERWORKS, 0x024a), chip_svw4 },
518 { PCI_VDEVICE(SERVERWORKS, 0x024b), chip_svw4 },
519 { PCI_VDEVICE(SERVERWORKS, 0x0410), chip_svw42 },
520 { PCI_VDEVICE(SERVERWORKS, 0x0411), chip_svw43 },
525 static struct pci_driver k2_sata_pci_driver = {
527 .id_table = k2_sata_pci_tbl,
528 .probe = k2_sata_init_one,
529 .remove = ata_pci_remove_one,
532 static int __init k2_sata_init(void)
534 return pci_register_driver(&k2_sata_pci_driver);
537 static void __exit k2_sata_exit(void)
539 pci_unregister_driver(&k2_sata_pci_driver);
542 MODULE_AUTHOR("Benjamin Herrenschmidt");
543 MODULE_DESCRIPTION("low-level driver for K2 SATA controller");
544 MODULE_LICENSE("GPL");
545 MODULE_DEVICE_TABLE(pci, k2_sata_pci_tbl);
546 MODULE_VERSION(DRV_VERSION);
548 module_init(k2_sata_init);
549 module_exit(k2_sata_exit);