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>
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 "1.06"
59 /* Taskfile registers offsets */
60 #define K2_SATA_TF_CMD_OFFSET 0x00
61 #define K2_SATA_TF_DATA_OFFSET 0x00
62 #define K2_SATA_TF_ERROR_OFFSET 0x04
63 #define K2_SATA_TF_NSECT_OFFSET 0x08
64 #define K2_SATA_TF_LBAL_OFFSET 0x0c
65 #define K2_SATA_TF_LBAM_OFFSET 0x10
66 #define K2_SATA_TF_LBAH_OFFSET 0x14
67 #define K2_SATA_TF_DEVICE_OFFSET 0x18
68 #define K2_SATA_TF_CMDSTAT_OFFSET 0x1c
69 #define K2_SATA_TF_CTL_OFFSET 0x20
72 #define K2_SATA_DMA_CMD_OFFSET 0x30
75 #define K2_SATA_SCR_STATUS_OFFSET 0x40
76 #define K2_SATA_SCR_ERROR_OFFSET 0x44
77 #define K2_SATA_SCR_CONTROL_OFFSET 0x48
80 #define K2_SATA_SICR1_OFFSET 0x80
81 #define K2_SATA_SICR2_OFFSET 0x84
82 #define K2_SATA_SIM_OFFSET 0x88
85 #define K2_SATA_PORT_OFFSET 0x100
88 static u32 k2_sata_scr_read (struct ata_port *ap, unsigned int sc_reg)
90 if (sc_reg > SCR_CONTROL)
92 return readl((void *) ap->ioaddr.scr_addr + (sc_reg * 4));
96 static void k2_sata_scr_write (struct ata_port *ap, unsigned int sc_reg,
99 if (sc_reg > SCR_CONTROL)
101 writel(val, (void *) ap->ioaddr.scr_addr + (sc_reg * 4));
105 static void k2_sata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
107 struct ata_ioports *ioaddr = &ap->ioaddr;
108 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
110 if (tf->ctl != ap->last_ctl) {
111 writeb(tf->ctl, ioaddr->ctl_addr);
112 ap->last_ctl = tf->ctl;
115 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
116 writew(tf->feature | (((u16)tf->hob_feature) << 8), ioaddr->feature_addr);
117 writew(tf->nsect | (((u16)tf->hob_nsect) << 8), ioaddr->nsect_addr);
118 writew(tf->lbal | (((u16)tf->hob_lbal) << 8), ioaddr->lbal_addr);
119 writew(tf->lbam | (((u16)tf->hob_lbam) << 8), ioaddr->lbam_addr);
120 writew(tf->lbah | (((u16)tf->hob_lbah) << 8), ioaddr->lbah_addr);
121 } else if (is_addr) {
122 writew(tf->feature, ioaddr->feature_addr);
123 writew(tf->nsect, ioaddr->nsect_addr);
124 writew(tf->lbal, ioaddr->lbal_addr);
125 writew(tf->lbam, ioaddr->lbam_addr);
126 writew(tf->lbah, ioaddr->lbah_addr);
129 if (tf->flags & ATA_TFLAG_DEVICE)
130 writeb(tf->device, ioaddr->device_addr);
136 static void k2_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
138 struct ata_ioports *ioaddr = &ap->ioaddr;
139 u16 nsect, lbal, lbam, lbah;
141 nsect = tf->nsect = readw(ioaddr->nsect_addr);
142 lbal = tf->lbal = readw(ioaddr->lbal_addr);
143 lbam = tf->lbam = readw(ioaddr->lbam_addr);
144 lbah = tf->lbah = readw(ioaddr->lbah_addr);
145 tf->device = readw(ioaddr->device_addr);
147 if (tf->flags & ATA_TFLAG_LBA48) {
148 tf->hob_feature = readw(ioaddr->error_addr) >> 8;
149 tf->hob_nsect = nsect >> 8;
150 tf->hob_lbal = lbal >> 8;
151 tf->hob_lbam = lbam >> 8;
152 tf->hob_lbah = lbah >> 8;
157 * k2_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction (MMIO)
158 * @qc: Info associated with this ATA transaction.
161 * spin_lock_irqsave(host_set lock)
164 static void k2_bmdma_setup_mmio (struct ata_queued_cmd *qc)
166 struct ata_port *ap = qc->ap;
167 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
169 void *mmio = (void *) ap->ioaddr.bmdma_addr;
170 /* load PRD table addr. */
171 mb(); /* make sure PRD table writes are visible to controller */
172 writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
174 /* specify data direction, triple-check start bit is clear */
175 dmactl = readb(mmio + ATA_DMA_CMD);
176 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
178 dmactl |= ATA_DMA_WR;
179 writeb(dmactl, mmio + ATA_DMA_CMD);
181 /* issue r/w command if this is not a ATA DMA command*/
182 if (qc->tf.protocol != ATA_PROT_DMA)
183 ap->ops->exec_command(ap, &qc->tf);
187 * k2_bmdma_start_mmio - Start a PCI IDE BMDMA transaction (MMIO)
188 * @qc: Info associated with this ATA transaction.
191 * spin_lock_irqsave(host_set lock)
194 static void k2_bmdma_start_mmio (struct ata_queued_cmd *qc)
196 struct ata_port *ap = qc->ap;
197 void *mmio = (void *) ap->ioaddr.bmdma_addr;
200 /* start host DMA transaction */
201 dmactl = readb(mmio + ATA_DMA_CMD);
202 writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
203 /* There is a race condition in certain SATA controllers that can
204 be seen when the r/w command is given to the controller before the
205 host DMA is started. On a Read command, the controller would initiate
206 the command to the drive even before it sees the DMA start. When there
207 are very fast drives connected to the controller, or when the data request
208 hits in the drive cache, there is the possibility that the drive returns a part
209 or all of the requested data to the controller before the DMA start is issued.
210 In this case, the controller would become confused as to what to do with the data.
211 In the worst case when all the data is returned back to the controller, the
212 controller could hang. In other cases it could return partial data returning
213 in data corruption. This problem has been seen in PPC systems and can also appear
214 on an system with very fast disks, where the SATA controller is sitting behind a
215 number of bridges, and hence there is significant latency between the r/w command
216 and the start command. */
217 /* issue r/w command if the access is to ATA*/
218 if (qc->tf.protocol == ATA_PROT_DMA)
219 ap->ops->exec_command(ap, &qc->tf);
223 static u8 k2_stat_check_status(struct ata_port *ap)
225 return readl((void *) ap->ioaddr.status_addr);
231 * inout : decides on the direction of the dataflow and the meaning of the
233 * buffer: If inout==FALSE data is being written to it else read from it
234 * *start: If inout==FALSE start of the valid data in the buffer
235 * offset: If inout==FALSE offset from the beginning of the imaginary file
236 * from which we start writing into the buffer
237 * length: If inout==FALSE max number of bytes to be written into the buffer
238 * else number of bytes in the buffer
240 static int k2_sata_proc_info(struct Scsi_Host *shost, char *page, char **start,
241 off_t offset, int count, int inout)
244 struct device_node *np;
247 /* Find the ata_port */
248 ap = (struct ata_port *) &shost->hostdata[0];
252 /* Find the OF node for the PCI device proper */
253 np = pci_device_to_OF_node(to_pci_dev(ap->host_set->dev));
257 /* Match it to a port node */
258 index = (ap == ap->host_set->ports[0]) ? 0 : 1;
259 for (np = np->child; np != NULL; np = np->sibling) {
260 u32 *reg = (u32 *)get_property(np, "reg", NULL);
269 len = sprintf(page, "devspec: %s\n", np->full_name);
273 #endif /* CONFIG_PPC_OF */
276 static Scsi_Host_Template k2_sata_sht = {
277 .module = THIS_MODULE,
279 .ioctl = ata_scsi_ioctl,
280 .queuecommand = ata_scsi_queuecmd,
281 .eh_strategy_handler = ata_scsi_error,
282 .can_queue = ATA_DEF_QUEUE,
283 .this_id = ATA_SHT_THIS_ID,
284 .sg_tablesize = LIBATA_MAX_PRD,
285 .max_sectors = ATA_MAX_SECTORS,
286 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
287 .emulated = ATA_SHT_EMULATED,
288 .use_clustering = ATA_SHT_USE_CLUSTERING,
289 .proc_name = DRV_NAME,
290 .dma_boundary = ATA_DMA_BOUNDARY,
291 .slave_configure = ata_scsi_slave_config,
293 .proc_info = k2_sata_proc_info,
295 .bios_param = ata_std_bios_param,
300 static const struct ata_port_operations k2_sata_ops = {
301 .port_disable = ata_port_disable,
302 .tf_load = k2_sata_tf_load,
303 .tf_read = k2_sata_tf_read,
304 .check_status = k2_stat_check_status,
305 .exec_command = ata_exec_command,
306 .dev_select = ata_std_dev_select,
307 .phy_reset = sata_phy_reset,
308 .bmdma_setup = k2_bmdma_setup_mmio,
309 .bmdma_start = k2_bmdma_start_mmio,
310 .bmdma_stop = ata_bmdma_stop,
311 .bmdma_status = ata_bmdma_status,
312 .qc_prep = ata_qc_prep,
313 .qc_issue = ata_qc_issue_prot,
314 .eng_timeout = ata_eng_timeout,
315 .irq_handler = ata_interrupt,
316 .irq_clear = ata_bmdma_irq_clear,
317 .scr_read = k2_sata_scr_read,
318 .scr_write = k2_sata_scr_write,
319 .port_start = ata_port_start,
320 .port_stop = ata_port_stop,
321 .host_stop = ata_pci_host_stop,
324 static void k2_sata_setup_port(struct ata_ioports *port, unsigned long base)
326 port->cmd_addr = base + K2_SATA_TF_CMD_OFFSET;
327 port->data_addr = base + K2_SATA_TF_DATA_OFFSET;
329 port->error_addr = base + K2_SATA_TF_ERROR_OFFSET;
330 port->nsect_addr = base + K2_SATA_TF_NSECT_OFFSET;
331 port->lbal_addr = base + K2_SATA_TF_LBAL_OFFSET;
332 port->lbam_addr = base + K2_SATA_TF_LBAM_OFFSET;
333 port->lbah_addr = base + K2_SATA_TF_LBAH_OFFSET;
334 port->device_addr = base + K2_SATA_TF_DEVICE_OFFSET;
336 port->status_addr = base + K2_SATA_TF_CMDSTAT_OFFSET;
337 port->altstatus_addr =
338 port->ctl_addr = base + K2_SATA_TF_CTL_OFFSET;
339 port->bmdma_addr = base + K2_SATA_DMA_CMD_OFFSET;
340 port->scr_addr = base + K2_SATA_SCR_STATUS_OFFSET;
344 static int k2_sata_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
346 static int printed_version;
347 struct ata_probe_ent *probe_ent = NULL;
349 void __iomem *mmio_base;
350 int pci_dev_busy = 0;
354 if (!printed_version++)
355 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
358 * If this driver happens to only be useful on Apple's K2, then
359 * we should check that here as it has a normal Serverworks ID
361 rc = pci_enable_device(pdev);
365 * Check if we have resources mapped at all (second function may
366 * have been disabled by firmware)
368 if (pci_resource_len(pdev, 5) == 0)
371 /* Request PCI regions */
372 rc = pci_request_regions(pdev, DRV_NAME);
378 rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
380 goto err_out_regions;
381 rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
383 goto err_out_regions;
385 probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
386 if (probe_ent == NULL) {
388 goto err_out_regions;
391 memset(probe_ent, 0, sizeof(*probe_ent));
392 probe_ent->dev = pci_dev_to_dev(pdev);
393 INIT_LIST_HEAD(&probe_ent->node);
395 mmio_base = pci_iomap(pdev, 5, 0);
396 if (mmio_base == NULL) {
398 goto err_out_free_ent;
400 base = (unsigned long) mmio_base;
402 /* Clear a magic bit in SCR1 according to Darwin, those help
403 * some funky seagate drives (though so far, those were already
404 * set by the firmware on the machines I had access to)
406 writel(readl(mmio_base + K2_SATA_SICR1_OFFSET) & ~0x00040000,
407 mmio_base + K2_SATA_SICR1_OFFSET);
409 /* Clear SATA error & interrupts we don't use */
410 writel(0xffffffff, mmio_base + K2_SATA_SCR_ERROR_OFFSET);
411 writel(0x0, mmio_base + K2_SATA_SIM_OFFSET);
413 probe_ent->sht = &k2_sata_sht;
414 probe_ent->host_flags = ATA_FLAG_SATA | ATA_FLAG_SATA_RESET |
415 ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
416 probe_ent->port_ops = &k2_sata_ops;
417 probe_ent->n_ports = 4;
418 probe_ent->irq = pdev->irq;
419 probe_ent->irq_flags = SA_SHIRQ;
420 probe_ent->mmio_base = mmio_base;
422 /* We don't care much about the PIO/UDMA masks, but the core won't like us
423 * if we don't fill these
425 probe_ent->pio_mask = 0x1f;
426 probe_ent->mwdma_mask = 0x7;
427 probe_ent->udma_mask = 0x7f;
429 /* different controllers have different number of ports - currently 4 or 8 */
430 /* All ports are on the same function. Multi-function device is no
431 * longer available. This should not be seen in any system. */
432 for (i = 0; i < ent->driver_data; i++)
433 k2_sata_setup_port(&probe_ent->port[i], base + i * K2_SATA_PORT_OFFSET);
435 pci_set_master(pdev);
437 /* FIXME: check ata_device_add return value */
438 ata_device_add(probe_ent);
446 pci_release_regions(pdev);
449 pci_disable_device(pdev);
453 /* 0x240 is device ID for Apple K2 device
454 * 0x241 is device ID for Serverworks Frodo4
455 * 0x242 is device ID for Serverworks Frodo8
456 * 0x24a is device ID for BCM5785 (aka HT1000) HT southbridge integrated SATA
459 static struct pci_device_id k2_sata_pci_tbl[] = {
460 { 0x1166, 0x0240, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 },
461 { 0x1166, 0x0241, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 },
462 { 0x1166, 0x0242, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 8 },
463 { 0x1166, 0x024a, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 },
468 static struct pci_driver k2_sata_pci_driver = {
470 .id_table = k2_sata_pci_tbl,
471 .probe = k2_sata_init_one,
472 .remove = ata_pci_remove_one,
476 static int __init k2_sata_init(void)
478 return pci_module_init(&k2_sata_pci_driver);
482 static void __exit k2_sata_exit(void)
484 pci_unregister_driver(&k2_sata_pci_driver);
488 MODULE_AUTHOR("Benjamin Herrenschmidt");
489 MODULE_DESCRIPTION("low-level driver for K2 SATA controller");
490 MODULE_LICENSE("GPL");
491 MODULE_DEVICE_TABLE(pci, k2_sata_pci_tbl);
492 MODULE_VERSION(DRV_VERSION);
494 module_init(k2_sata_init);
495 module_exit(k2_sata_exit);