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 <linux/libata.h>
52 #include <asm/pci-bridge.h>
53 #endif /* CONFIG_PPC_OF */
55 #define DRV_NAME "sata_svw"
56 #define DRV_VERSION "2.3"
60 K2_FLAG_SATA_8_PORTS = (1 << 24),
61 K2_FLAG_NO_ATAPI_DMA = (1 << 25),
63 /* Taskfile registers offsets */
64 K2_SATA_TF_CMD_OFFSET = 0x00,
65 K2_SATA_TF_DATA_OFFSET = 0x00,
66 K2_SATA_TF_ERROR_OFFSET = 0x04,
67 K2_SATA_TF_NSECT_OFFSET = 0x08,
68 K2_SATA_TF_LBAL_OFFSET = 0x0c,
69 K2_SATA_TF_LBAM_OFFSET = 0x10,
70 K2_SATA_TF_LBAH_OFFSET = 0x14,
71 K2_SATA_TF_DEVICE_OFFSET = 0x18,
72 K2_SATA_TF_CMDSTAT_OFFSET = 0x1c,
73 K2_SATA_TF_CTL_OFFSET = 0x20,
76 K2_SATA_DMA_CMD_OFFSET = 0x30,
79 K2_SATA_SCR_STATUS_OFFSET = 0x40,
80 K2_SATA_SCR_ERROR_OFFSET = 0x44,
81 K2_SATA_SCR_CONTROL_OFFSET = 0x48,
84 K2_SATA_SICR1_OFFSET = 0x80,
85 K2_SATA_SICR2_OFFSET = 0x84,
86 K2_SATA_SIM_OFFSET = 0x88,
89 K2_SATA_PORT_OFFSET = 0x100,
95 static u8 k2_stat_check_status(struct ata_port *ap);
98 static int k2_sata_check_atapi_dma(struct ata_queued_cmd *qc)
100 if (qc->ap->flags & K2_FLAG_NO_ATAPI_DMA)
101 return -1; /* ATAPI DMA not supported */
106 static int k2_sata_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
108 if (sc_reg > SCR_CONTROL)
110 *val = readl(ap->ioaddr.scr_addr + (sc_reg * 4));
115 static int k2_sata_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
117 if (sc_reg > SCR_CONTROL)
119 writel(val, ap->ioaddr.scr_addr + (sc_reg * 4));
124 static void k2_sata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
126 struct ata_ioports *ioaddr = &ap->ioaddr;
127 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
129 if (tf->ctl != ap->last_ctl) {
130 writeb(tf->ctl, ioaddr->ctl_addr);
131 ap->last_ctl = tf->ctl;
134 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
135 writew(tf->feature | (((u16)tf->hob_feature) << 8),
136 ioaddr->feature_addr);
137 writew(tf->nsect | (((u16)tf->hob_nsect) << 8),
139 writew(tf->lbal | (((u16)tf->hob_lbal) << 8),
141 writew(tf->lbam | (((u16)tf->hob_lbam) << 8),
143 writew(tf->lbah | (((u16)tf->hob_lbah) << 8),
145 } else if (is_addr) {
146 writew(tf->feature, ioaddr->feature_addr);
147 writew(tf->nsect, ioaddr->nsect_addr);
148 writew(tf->lbal, ioaddr->lbal_addr);
149 writew(tf->lbam, ioaddr->lbam_addr);
150 writew(tf->lbah, ioaddr->lbah_addr);
153 if (tf->flags & ATA_TFLAG_DEVICE)
154 writeb(tf->device, ioaddr->device_addr);
160 static void k2_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
162 struct ata_ioports *ioaddr = &ap->ioaddr;
163 u16 nsect, lbal, lbam, lbah, feature;
165 tf->command = k2_stat_check_status(ap);
166 tf->device = readw(ioaddr->device_addr);
167 feature = readw(ioaddr->error_addr);
168 nsect = readw(ioaddr->nsect_addr);
169 lbal = readw(ioaddr->lbal_addr);
170 lbam = readw(ioaddr->lbam_addr);
171 lbah = readw(ioaddr->lbah_addr);
173 tf->feature = feature;
179 if (tf->flags & ATA_TFLAG_LBA48) {
180 tf->hob_feature = feature >> 8;
181 tf->hob_nsect = nsect >> 8;
182 tf->hob_lbal = lbal >> 8;
183 tf->hob_lbam = lbam >> 8;
184 tf->hob_lbah = lbah >> 8;
189 * k2_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction (MMIO)
190 * @qc: Info associated with this ATA transaction.
193 * spin_lock_irqsave(host lock)
196 static void k2_bmdma_setup_mmio (struct ata_queued_cmd *qc)
198 struct ata_port *ap = qc->ap;
199 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
201 void __iomem *mmio = ap->ioaddr.bmdma_addr;
203 /* load PRD table addr. */
204 mb(); /* make sure PRD table writes are visible to controller */
205 writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
207 /* specify data direction, triple-check start bit is clear */
208 dmactl = readb(mmio + ATA_DMA_CMD);
209 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
211 dmactl |= ATA_DMA_WR;
212 writeb(dmactl, mmio + ATA_DMA_CMD);
214 /* issue r/w command if this is not a ATA DMA command*/
215 if (qc->tf.protocol != ATA_PROT_DMA)
216 ap->ops->exec_command(ap, &qc->tf);
220 * k2_bmdma_start_mmio - Start a PCI IDE BMDMA transaction (MMIO)
221 * @qc: Info associated with this ATA transaction.
224 * spin_lock_irqsave(host lock)
227 static void k2_bmdma_start_mmio (struct ata_queued_cmd *qc)
229 struct ata_port *ap = qc->ap;
230 void __iomem *mmio = ap->ioaddr.bmdma_addr;
233 /* start host DMA transaction */
234 dmactl = readb(mmio + ATA_DMA_CMD);
235 writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
236 /* There is a race condition in certain SATA controllers that can
237 be seen when the r/w command is given to the controller before the
238 host DMA is started. On a Read command, the controller would initiate
239 the command to the drive even before it sees the DMA start. When there
240 are very fast drives connected to the controller, or when the data request
241 hits in the drive cache, there is the possibility that the drive returns a part
242 or all of the requested data to the controller before the DMA start is issued.
243 In this case, the controller would become confused as to what to do with the data.
244 In the worst case when all the data is returned back to the controller, the
245 controller could hang. In other cases it could return partial data returning
246 in data corruption. This problem has been seen in PPC systems and can also appear
247 on an system with very fast disks, where the SATA controller is sitting behind a
248 number of bridges, and hence there is significant latency between the r/w command
249 and the start command. */
250 /* issue r/w command if the access is to ATA*/
251 if (qc->tf.protocol == ATA_PROT_DMA)
252 ap->ops->exec_command(ap, &qc->tf);
256 static u8 k2_stat_check_status(struct ata_port *ap)
258 return readl(ap->ioaddr.status_addr);
264 * inout : decides on the direction of the dataflow and the meaning of the
266 * buffer: If inout==FALSE data is being written to it else read from it
267 * *start: If inout==FALSE start of the valid data in the buffer
268 * offset: If inout==FALSE offset from the beginning of the imaginary file
269 * from which we start writing into the buffer
270 * length: If inout==FALSE max number of bytes to be written into the buffer
271 * else number of bytes in the buffer
273 static int k2_sata_proc_info(struct Scsi_Host *shost, char *page, char **start,
274 off_t offset, int count, int inout)
277 struct device_node *np;
280 /* Find the ata_port */
281 ap = ata_shost_to_port(shost);
285 /* Find the OF node for the PCI device proper */
286 np = pci_device_to_OF_node(to_pci_dev(ap->host->dev));
290 /* Match it to a port node */
291 index = (ap == ap->host->ports[0]) ? 0 : 1;
292 for (np = np->child; np != NULL; np = np->sibling) {
293 const u32 *reg = of_get_property(np, "reg", NULL);
302 len = sprintf(page, "devspec: %s\n", np->full_name);
306 #endif /* CONFIG_PPC_OF */
309 static struct scsi_host_template k2_sata_sht = {
310 .module = THIS_MODULE,
312 .ioctl = ata_scsi_ioctl,
313 .queuecommand = ata_scsi_queuecmd,
314 .can_queue = ATA_DEF_QUEUE,
315 .this_id = ATA_SHT_THIS_ID,
316 .sg_tablesize = LIBATA_MAX_PRD,
317 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
318 .emulated = ATA_SHT_EMULATED,
319 .use_clustering = ATA_SHT_USE_CLUSTERING,
320 .proc_name = DRV_NAME,
321 .dma_boundary = ATA_DMA_BOUNDARY,
322 .slave_configure = ata_scsi_slave_config,
323 .slave_destroy = ata_scsi_slave_destroy,
325 .proc_info = k2_sata_proc_info,
327 .bios_param = ata_std_bios_param,
331 static const struct ata_port_operations k2_sata_ops = {
332 .tf_load = k2_sata_tf_load,
333 .tf_read = k2_sata_tf_read,
334 .check_status = k2_stat_check_status,
335 .exec_command = ata_exec_command,
336 .dev_select = ata_std_dev_select,
337 .check_atapi_dma = k2_sata_check_atapi_dma,
338 .bmdma_setup = k2_bmdma_setup_mmio,
339 .bmdma_start = k2_bmdma_start_mmio,
340 .bmdma_stop = ata_bmdma_stop,
341 .bmdma_status = ata_bmdma_status,
342 .qc_prep = ata_qc_prep,
343 .qc_issue = ata_qc_issue_prot,
344 .data_xfer = ata_data_xfer,
345 .freeze = ata_bmdma_freeze,
346 .thaw = ata_bmdma_thaw,
347 .error_handler = ata_bmdma_error_handler,
348 .post_internal_cmd = ata_bmdma_post_internal_cmd,
349 .irq_clear = ata_bmdma_irq_clear,
350 .irq_on = ata_irq_on,
351 .scr_read = k2_sata_scr_read,
352 .scr_write = k2_sata_scr_write,
353 .port_start = ata_port_start,
356 static const struct ata_port_info k2_port_info[] = {
359 .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
360 ATA_FLAG_MMIO | K2_FLAG_NO_ATAPI_DMA,
363 .udma_mask = ATA_UDMA6,
364 .port_ops = &k2_sata_ops,
368 .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
369 ATA_FLAG_MMIO | K2_FLAG_NO_ATAPI_DMA |
370 K2_FLAG_SATA_8_PORTS,
373 .udma_mask = ATA_UDMA6,
374 .port_ops = &k2_sata_ops,
378 static void k2_sata_setup_port(struct ata_ioports *port, void __iomem *base)
380 port->cmd_addr = base + K2_SATA_TF_CMD_OFFSET;
381 port->data_addr = base + K2_SATA_TF_DATA_OFFSET;
383 port->error_addr = base + K2_SATA_TF_ERROR_OFFSET;
384 port->nsect_addr = base + K2_SATA_TF_NSECT_OFFSET;
385 port->lbal_addr = base + K2_SATA_TF_LBAL_OFFSET;
386 port->lbam_addr = base + K2_SATA_TF_LBAM_OFFSET;
387 port->lbah_addr = base + K2_SATA_TF_LBAH_OFFSET;
388 port->device_addr = base + K2_SATA_TF_DEVICE_OFFSET;
390 port->status_addr = base + K2_SATA_TF_CMDSTAT_OFFSET;
391 port->altstatus_addr =
392 port->ctl_addr = base + K2_SATA_TF_CTL_OFFSET;
393 port->bmdma_addr = base + K2_SATA_DMA_CMD_OFFSET;
394 port->scr_addr = base + K2_SATA_SCR_STATUS_OFFSET;
398 static int k2_sata_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
400 static int printed_version;
401 const struct ata_port_info *ppi[] =
402 { &k2_port_info[ent->driver_data], NULL };
403 struct ata_host *host;
404 void __iomem *mmio_base;
407 if (!printed_version++)
408 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
412 if (ppi[0]->flags & K2_FLAG_SATA_8_PORTS)
415 host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
420 * If this driver happens to only be useful on Apple's K2, then
421 * we should check that here as it has a normal Serverworks ID
423 rc = pcim_enable_device(pdev);
428 * Check if we have resources mapped at all (second function may
429 * have been disabled by firmware)
431 if (pci_resource_len(pdev, 5) == 0)
434 /* Request and iomap PCI regions */
435 rc = pcim_iomap_regions(pdev, 1 << 5, DRV_NAME);
437 pcim_pin_device(pdev);
440 host->iomap = pcim_iomap_table(pdev);
441 mmio_base = host->iomap[5];
443 /* different controllers have different number of ports - currently 4 or 8 */
444 /* All ports are on the same function. Multi-function device is no
445 * longer available. This should not be seen in any system. */
446 for (i = 0; i < host->n_ports; i++) {
447 struct ata_port *ap = host->ports[i];
448 unsigned int offset = i * K2_SATA_PORT_OFFSET;
450 k2_sata_setup_port(&ap->ioaddr, mmio_base + offset);
452 ata_port_pbar_desc(ap, 5, -1, "mmio");
453 ata_port_pbar_desc(ap, 5, offset, "port");
456 rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
459 rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
463 /* Clear a magic bit in SCR1 according to Darwin, those help
464 * some funky seagate drives (though so far, those were already
465 * set by the firmware on the machines I had access to)
467 writel(readl(mmio_base + K2_SATA_SICR1_OFFSET) & ~0x00040000,
468 mmio_base + K2_SATA_SICR1_OFFSET);
470 /* Clear SATA error & interrupts we don't use */
471 writel(0xffffffff, mmio_base + K2_SATA_SCR_ERROR_OFFSET);
472 writel(0x0, mmio_base + K2_SATA_SIM_OFFSET);
474 pci_set_master(pdev);
475 return ata_host_activate(host, pdev->irq, ata_interrupt, IRQF_SHARED,
479 /* 0x240 is device ID for Apple K2 device
480 * 0x241 is device ID for Serverworks Frodo4
481 * 0x242 is device ID for Serverworks Frodo8
482 * 0x24a is device ID for BCM5785 (aka HT1000) HT southbridge integrated SATA
485 static const struct pci_device_id k2_sata_pci_tbl[] = {
486 { PCI_VDEVICE(SERVERWORKS, 0x0240), board_svw4 },
487 { PCI_VDEVICE(SERVERWORKS, 0x0241), board_svw4 },
488 { PCI_VDEVICE(SERVERWORKS, 0x0242), board_svw8 },
489 { PCI_VDEVICE(SERVERWORKS, 0x024a), board_svw4 },
490 { PCI_VDEVICE(SERVERWORKS, 0x024b), board_svw4 },
495 static struct pci_driver k2_sata_pci_driver = {
497 .id_table = k2_sata_pci_tbl,
498 .probe = k2_sata_init_one,
499 .remove = ata_pci_remove_one,
502 static int __init k2_sata_init(void)
504 return pci_register_driver(&k2_sata_pci_driver);
507 static void __exit k2_sata_exit(void)
509 pci_unregister_driver(&k2_sata_pci_driver);
512 MODULE_AUTHOR("Benjamin Herrenschmidt");
513 MODULE_DESCRIPTION("low-level driver for K2 SATA controller");
514 MODULE_LICENSE("GPL");
515 MODULE_DEVICE_TABLE(pci, k2_sata_pci_tbl);
516 MODULE_VERSION(DRV_VERSION);
518 module_init(k2_sata_init);
519 module_exit(k2_sata_exit);