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/config.h>
40 #include <linux/kernel.h>
41 #include <linux/module.h>
42 #include <linux/pci.h>
43 #include <linux/init.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/interrupt.h>
47 #include <linux/device.h>
48 #include <scsi/scsi_host.h>
49 #include <linux/libata.h>
53 #include <asm/pci-bridge.h>
54 #endif /* CONFIG_PPC_OF */
56 #define DRV_NAME "sata_svw"
57 #define DRV_VERSION "1.07"
60 /* Taskfile registers offsets */
61 K2_SATA_TF_CMD_OFFSET = 0x00,
62 K2_SATA_TF_DATA_OFFSET = 0x00,
63 K2_SATA_TF_ERROR_OFFSET = 0x04,
64 K2_SATA_TF_NSECT_OFFSET = 0x08,
65 K2_SATA_TF_LBAL_OFFSET = 0x0c,
66 K2_SATA_TF_LBAM_OFFSET = 0x10,
67 K2_SATA_TF_LBAH_OFFSET = 0x14,
68 K2_SATA_TF_DEVICE_OFFSET = 0x18,
69 K2_SATA_TF_CMDSTAT_OFFSET = 0x1c,
70 K2_SATA_TF_CTL_OFFSET = 0x20,
73 K2_SATA_DMA_CMD_OFFSET = 0x30,
76 K2_SATA_SCR_STATUS_OFFSET = 0x40,
77 K2_SATA_SCR_ERROR_OFFSET = 0x44,
78 K2_SATA_SCR_CONTROL_OFFSET = 0x48,
81 K2_SATA_SICR1_OFFSET = 0x80,
82 K2_SATA_SICR2_OFFSET = 0x84,
83 K2_SATA_SIM_OFFSET = 0x88,
86 K2_SATA_PORT_OFFSET = 0x100,
89 static u8 k2_stat_check_status(struct ata_port *ap);
92 static u32 k2_sata_scr_read (struct ata_port *ap, unsigned int sc_reg)
94 if (sc_reg > SCR_CONTROL)
96 return readl((void *) ap->ioaddr.scr_addr + (sc_reg * 4));
100 static void k2_sata_scr_write (struct ata_port *ap, unsigned int sc_reg,
103 if (sc_reg > SCR_CONTROL)
105 writel(val, (void *) ap->ioaddr.scr_addr + (sc_reg * 4));
109 static void k2_sata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
111 struct ata_ioports *ioaddr = &ap->ioaddr;
112 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
114 if (tf->ctl != ap->last_ctl) {
115 writeb(tf->ctl, ioaddr->ctl_addr);
116 ap->last_ctl = tf->ctl;
119 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
120 writew(tf->feature | (((u16)tf->hob_feature) << 8), ioaddr->feature_addr);
121 writew(tf->nsect | (((u16)tf->hob_nsect) << 8), ioaddr->nsect_addr);
122 writew(tf->lbal | (((u16)tf->hob_lbal) << 8), ioaddr->lbal_addr);
123 writew(tf->lbam | (((u16)tf->hob_lbam) << 8), ioaddr->lbam_addr);
124 writew(tf->lbah | (((u16)tf->hob_lbah) << 8), ioaddr->lbah_addr);
125 } else if (is_addr) {
126 writew(tf->feature, ioaddr->feature_addr);
127 writew(tf->nsect, ioaddr->nsect_addr);
128 writew(tf->lbal, ioaddr->lbal_addr);
129 writew(tf->lbam, ioaddr->lbam_addr);
130 writew(tf->lbah, ioaddr->lbah_addr);
133 if (tf->flags & ATA_TFLAG_DEVICE)
134 writeb(tf->device, ioaddr->device_addr);
140 static void k2_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
142 struct ata_ioports *ioaddr = &ap->ioaddr;
143 u16 nsect, lbal, lbam, lbah, feature;
145 tf->command = k2_stat_check_status(ap);
146 tf->device = readw(ioaddr->device_addr);
147 feature = readw(ioaddr->error_addr);
148 nsect = readw(ioaddr->nsect_addr);
149 lbal = readw(ioaddr->lbal_addr);
150 lbam = readw(ioaddr->lbam_addr);
151 lbah = readw(ioaddr->lbah_addr);
153 tf->feature = feature;
159 if (tf->flags & ATA_TFLAG_LBA48) {
160 tf->hob_feature = feature >> 8;
161 tf->hob_nsect = nsect >> 8;
162 tf->hob_lbal = lbal >> 8;
163 tf->hob_lbam = lbam >> 8;
164 tf->hob_lbah = lbah >> 8;
169 * k2_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction (MMIO)
170 * @qc: Info associated with this ATA transaction.
173 * spin_lock_irqsave(host_set lock)
176 static void k2_bmdma_setup_mmio (struct ata_queued_cmd *qc)
178 struct ata_port *ap = qc->ap;
179 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
181 void *mmio = (void *) ap->ioaddr.bmdma_addr;
182 /* load PRD table addr. */
183 mb(); /* make sure PRD table writes are visible to controller */
184 writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
186 /* specify data direction, triple-check start bit is clear */
187 dmactl = readb(mmio + ATA_DMA_CMD);
188 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
190 dmactl |= ATA_DMA_WR;
191 writeb(dmactl, mmio + ATA_DMA_CMD);
193 /* issue r/w command if this is not a ATA DMA command*/
194 if (qc->tf.protocol != ATA_PROT_DMA)
195 ap->ops->exec_command(ap, &qc->tf);
199 * k2_bmdma_start_mmio - Start a PCI IDE BMDMA transaction (MMIO)
200 * @qc: Info associated with this ATA transaction.
203 * spin_lock_irqsave(host_set lock)
206 static void k2_bmdma_start_mmio (struct ata_queued_cmd *qc)
208 struct ata_port *ap = qc->ap;
209 void *mmio = (void *) ap->ioaddr.bmdma_addr;
212 /* start host DMA transaction */
213 dmactl = readb(mmio + ATA_DMA_CMD);
214 writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
215 /* There is a race condition in certain SATA controllers that can
216 be seen when the r/w command is given to the controller before the
217 host DMA is started. On a Read command, the controller would initiate
218 the command to the drive even before it sees the DMA start. When there
219 are very fast drives connected to the controller, or when the data request
220 hits in the drive cache, there is the possibility that the drive returns a part
221 or all of the requested data to the controller before the DMA start is issued.
222 In this case, the controller would become confused as to what to do with the data.
223 In the worst case when all the data is returned back to the controller, the
224 controller could hang. In other cases it could return partial data returning
225 in data corruption. This problem has been seen in PPC systems and can also appear
226 on an system with very fast disks, where the SATA controller is sitting behind a
227 number of bridges, and hence there is significant latency between the r/w command
228 and the start command. */
229 /* issue r/w command if the access is to ATA*/
230 if (qc->tf.protocol == ATA_PROT_DMA)
231 ap->ops->exec_command(ap, &qc->tf);
235 static u8 k2_stat_check_status(struct ata_port *ap)
237 return readl((void *) ap->ioaddr.status_addr);
243 * inout : decides on the direction of the dataflow and the meaning of the
245 * buffer: If inout==FALSE data is being written to it else read from it
246 * *start: If inout==FALSE start of the valid data in the buffer
247 * offset: If inout==FALSE offset from the beginning of the imaginary file
248 * from which we start writing into the buffer
249 * length: If inout==FALSE max number of bytes to be written into the buffer
250 * else number of bytes in the buffer
252 static int k2_sata_proc_info(struct Scsi_Host *shost, char *page, char **start,
253 off_t offset, int count, int inout)
256 struct device_node *np;
259 /* Find the ata_port */
260 ap = (struct ata_port *) &shost->hostdata[0];
264 /* Find the OF node for the PCI device proper */
265 np = pci_device_to_OF_node(to_pci_dev(ap->host_set->dev));
269 /* Match it to a port node */
270 index = (ap == ap->host_set->ports[0]) ? 0 : 1;
271 for (np = np->child; np != NULL; np = np->sibling) {
272 u32 *reg = (u32 *)get_property(np, "reg", NULL);
281 len = sprintf(page, "devspec: %s\n", np->full_name);
285 #endif /* CONFIG_PPC_OF */
288 static struct scsi_host_template k2_sata_sht = {
289 .module = THIS_MODULE,
291 .ioctl = ata_scsi_ioctl,
292 .queuecommand = ata_scsi_queuecmd,
293 .eh_strategy_handler = ata_scsi_error,
294 .can_queue = ATA_DEF_QUEUE,
295 .this_id = ATA_SHT_THIS_ID,
296 .sg_tablesize = LIBATA_MAX_PRD,
297 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
298 .emulated = ATA_SHT_EMULATED,
299 .use_clustering = ATA_SHT_USE_CLUSTERING,
300 .proc_name = DRV_NAME,
301 .dma_boundary = ATA_DMA_BOUNDARY,
302 .slave_configure = ata_scsi_slave_config,
304 .proc_info = k2_sata_proc_info,
306 .bios_param = ata_std_bios_param,
310 static const struct ata_port_operations k2_sata_ops = {
311 .port_disable = ata_port_disable,
312 .tf_load = k2_sata_tf_load,
313 .tf_read = k2_sata_tf_read,
314 .check_status = k2_stat_check_status,
315 .exec_command = ata_exec_command,
316 .dev_select = ata_std_dev_select,
317 .phy_reset = sata_phy_reset,
318 .bmdma_setup = k2_bmdma_setup_mmio,
319 .bmdma_start = k2_bmdma_start_mmio,
320 .bmdma_stop = ata_bmdma_stop,
321 .bmdma_status = ata_bmdma_status,
322 .qc_prep = ata_qc_prep,
323 .qc_issue = ata_qc_issue_prot,
324 .eng_timeout = ata_eng_timeout,
325 .irq_handler = ata_interrupt,
326 .irq_clear = ata_bmdma_irq_clear,
327 .scr_read = k2_sata_scr_read,
328 .scr_write = k2_sata_scr_write,
329 .port_start = ata_port_start,
330 .port_stop = ata_port_stop,
331 .host_stop = ata_pci_host_stop,
334 static void k2_sata_setup_port(struct ata_ioports *port, unsigned long base)
336 port->cmd_addr = base + K2_SATA_TF_CMD_OFFSET;
337 port->data_addr = base + K2_SATA_TF_DATA_OFFSET;
339 port->error_addr = base + K2_SATA_TF_ERROR_OFFSET;
340 port->nsect_addr = base + K2_SATA_TF_NSECT_OFFSET;
341 port->lbal_addr = base + K2_SATA_TF_LBAL_OFFSET;
342 port->lbam_addr = base + K2_SATA_TF_LBAM_OFFSET;
343 port->lbah_addr = base + K2_SATA_TF_LBAH_OFFSET;
344 port->device_addr = base + K2_SATA_TF_DEVICE_OFFSET;
346 port->status_addr = base + K2_SATA_TF_CMDSTAT_OFFSET;
347 port->altstatus_addr =
348 port->ctl_addr = base + K2_SATA_TF_CTL_OFFSET;
349 port->bmdma_addr = base + K2_SATA_DMA_CMD_OFFSET;
350 port->scr_addr = base + K2_SATA_SCR_STATUS_OFFSET;
354 static int k2_sata_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
356 static int printed_version;
357 struct ata_probe_ent *probe_ent = NULL;
359 void __iomem *mmio_base;
360 int pci_dev_busy = 0;
364 if (!printed_version++)
365 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
368 * If this driver happens to only be useful on Apple's K2, then
369 * we should check that here as it has a normal Serverworks ID
371 rc = pci_enable_device(pdev);
375 * Check if we have resources mapped at all (second function may
376 * have been disabled by firmware)
378 if (pci_resource_len(pdev, 5) == 0)
381 /* Request PCI regions */
382 rc = pci_request_regions(pdev, DRV_NAME);
388 rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
390 goto err_out_regions;
391 rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
393 goto err_out_regions;
395 probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
396 if (probe_ent == NULL) {
398 goto err_out_regions;
401 memset(probe_ent, 0, sizeof(*probe_ent));
402 probe_ent->dev = pci_dev_to_dev(pdev);
403 INIT_LIST_HEAD(&probe_ent->node);
405 mmio_base = pci_iomap(pdev, 5, 0);
406 if (mmio_base == NULL) {
408 goto err_out_free_ent;
410 base = (unsigned long) mmio_base;
412 /* Clear a magic bit in SCR1 according to Darwin, those help
413 * some funky seagate drives (though so far, those were already
414 * set by the firmware on the machines I had access to)
416 writel(readl(mmio_base + K2_SATA_SICR1_OFFSET) & ~0x00040000,
417 mmio_base + K2_SATA_SICR1_OFFSET);
419 /* Clear SATA error & interrupts we don't use */
420 writel(0xffffffff, mmio_base + K2_SATA_SCR_ERROR_OFFSET);
421 writel(0x0, mmio_base + K2_SATA_SIM_OFFSET);
423 probe_ent->sht = &k2_sata_sht;
424 probe_ent->host_flags = ATA_FLAG_SATA | ATA_FLAG_SATA_RESET |
425 ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
426 probe_ent->port_ops = &k2_sata_ops;
427 probe_ent->n_ports = 4;
428 probe_ent->irq = pdev->irq;
429 probe_ent->irq_flags = SA_SHIRQ;
430 probe_ent->mmio_base = mmio_base;
432 /* We don't care much about the PIO/UDMA masks, but the core won't like us
433 * if we don't fill these
435 probe_ent->pio_mask = 0x1f;
436 probe_ent->mwdma_mask = 0x7;
437 probe_ent->udma_mask = 0x7f;
439 /* different controllers have different number of ports - currently 4 or 8 */
440 /* All ports are on the same function. Multi-function device is no
441 * longer available. This should not be seen in any system. */
442 for (i = 0; i < ent->driver_data; i++)
443 k2_sata_setup_port(&probe_ent->port[i], base + i * K2_SATA_PORT_OFFSET);
445 pci_set_master(pdev);
447 /* FIXME: check ata_device_add return value */
448 ata_device_add(probe_ent);
456 pci_release_regions(pdev);
459 pci_disable_device(pdev);
463 /* 0x240 is device ID for Apple K2 device
464 * 0x241 is device ID for Serverworks Frodo4
465 * 0x242 is device ID for Serverworks Frodo8
466 * 0x24a is device ID for BCM5785 (aka HT1000) HT southbridge integrated SATA
469 static const struct pci_device_id k2_sata_pci_tbl[] = {
470 { 0x1166, 0x0240, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 },
471 { 0x1166, 0x0241, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 },
472 { 0x1166, 0x0242, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 8 },
473 { 0x1166, 0x024a, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 },
474 { 0x1166, 0x024b, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 },
479 static struct pci_driver k2_sata_pci_driver = {
481 .id_table = k2_sata_pci_tbl,
482 .probe = k2_sata_init_one,
483 .remove = ata_pci_remove_one,
487 static int __init k2_sata_init(void)
489 return pci_module_init(&k2_sata_pci_driver);
493 static void __exit k2_sata_exit(void)
495 pci_unregister_driver(&k2_sata_pci_driver);
499 MODULE_AUTHOR("Benjamin Herrenschmidt");
500 MODULE_DESCRIPTION("low-level driver for K2 SATA controller");
501 MODULE_LICENSE("GPL");
502 MODULE_DEVICE_TABLE(pci, k2_sata_pci_tbl);
503 MODULE_VERSION(DRV_VERSION);
505 module_init(k2_sata_init);
506 module_exit(k2_sata_exit);