2 * sata_vsc.c - Vitesse VSC7174 4 port DPA SATA
4 * Maintained by: Jeremy Higdon @ SGI
5 * Please ALWAYS copy linux-ide@vger.kernel.org
10 * Bits from Jeff Garzik, Copyright RedHat, Inc.
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2, or (at your option)
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; see the file COPYING. If not, write to
25 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
28 * libata documentation is available via 'make {ps|pdf}docs',
29 * as Documentation/DocBook/libata.*
31 * Vitesse hardware documentation presumably available under NDA.
32 * Intel 31244 (same hardware interface) documentation presumably
33 * available from http://developer.intel.com/
37 #include <linux/kernel.h>
38 #include <linux/module.h>
39 #include <linux/pci.h>
40 #include <linux/init.h>
41 #include <linux/blkdev.h>
42 #include <linux/delay.h>
43 #include <linux/interrupt.h>
44 #include <linux/dma-mapping.h>
45 #include <linux/device.h>
46 #include <scsi/scsi_host.h>
47 #include <linux/libata.h>
49 #define DRV_NAME "sata_vsc"
50 #define DRV_VERSION "2.3"
55 /* Interrupt register offsets (from chip base address) */
56 VSC_SATA_INT_STAT_OFFSET = 0x00,
57 VSC_SATA_INT_MASK_OFFSET = 0x04,
59 /* Taskfile registers offsets */
60 VSC_SATA_TF_CMD_OFFSET = 0x00,
61 VSC_SATA_TF_DATA_OFFSET = 0x00,
62 VSC_SATA_TF_ERROR_OFFSET = 0x04,
63 VSC_SATA_TF_FEATURE_OFFSET = 0x06,
64 VSC_SATA_TF_NSECT_OFFSET = 0x08,
65 VSC_SATA_TF_LBAL_OFFSET = 0x0c,
66 VSC_SATA_TF_LBAM_OFFSET = 0x10,
67 VSC_SATA_TF_LBAH_OFFSET = 0x14,
68 VSC_SATA_TF_DEVICE_OFFSET = 0x18,
69 VSC_SATA_TF_STATUS_OFFSET = 0x1c,
70 VSC_SATA_TF_COMMAND_OFFSET = 0x1d,
71 VSC_SATA_TF_ALTSTATUS_OFFSET = 0x28,
72 VSC_SATA_TF_CTL_OFFSET = 0x29,
75 VSC_SATA_UP_DESCRIPTOR_OFFSET = 0x64,
76 VSC_SATA_UP_DATA_BUFFER_OFFSET = 0x6C,
77 VSC_SATA_DMA_CMD_OFFSET = 0x70,
80 VSC_SATA_SCR_STATUS_OFFSET = 0x100,
81 VSC_SATA_SCR_ERROR_OFFSET = 0x104,
82 VSC_SATA_SCR_CONTROL_OFFSET = 0x108,
85 VSC_SATA_PORT_OFFSET = 0x200,
87 /* Error interrupt status bit offsets */
88 VSC_SATA_INT_ERROR_CRC = 0x40,
89 VSC_SATA_INT_ERROR_T = 0x20,
90 VSC_SATA_INT_ERROR_P = 0x10,
91 VSC_SATA_INT_ERROR_R = 0x8,
92 VSC_SATA_INT_ERROR_E = 0x4,
93 VSC_SATA_INT_ERROR_M = 0x2,
94 VSC_SATA_INT_PHY_CHANGE = 0x1,
95 VSC_SATA_INT_ERROR = (VSC_SATA_INT_ERROR_CRC | VSC_SATA_INT_ERROR_T | \
96 VSC_SATA_INT_ERROR_P | VSC_SATA_INT_ERROR_R | \
97 VSC_SATA_INT_ERROR_E | VSC_SATA_INT_ERROR_M | \
98 VSC_SATA_INT_PHY_CHANGE),
101 static int vsc_sata_scr_read(struct ata_link *link,
102 unsigned int sc_reg, u32 *val)
104 if (sc_reg > SCR_CONTROL)
106 *val = readl(link->ap->ioaddr.scr_addr + (sc_reg * 4));
111 static int vsc_sata_scr_write(struct ata_link *link,
112 unsigned int sc_reg, u32 val)
114 if (sc_reg > SCR_CONTROL)
116 writel(val, link->ap->ioaddr.scr_addr + (sc_reg * 4));
121 static void vsc_freeze(struct ata_port *ap)
123 void __iomem *mask_addr;
125 mask_addr = ap->host->iomap[VSC_MMIO_BAR] +
126 VSC_SATA_INT_MASK_OFFSET + ap->port_no;
128 writeb(0, mask_addr);
132 static void vsc_thaw(struct ata_port *ap)
134 void __iomem *mask_addr;
136 mask_addr = ap->host->iomap[VSC_MMIO_BAR] +
137 VSC_SATA_INT_MASK_OFFSET + ap->port_no;
139 writeb(0xff, mask_addr);
143 static void vsc_intr_mask_update(struct ata_port *ap, u8 ctl)
145 void __iomem *mask_addr;
148 mask_addr = ap->host->iomap[VSC_MMIO_BAR] +
149 VSC_SATA_INT_MASK_OFFSET + ap->port_no;
150 mask = readb(mask_addr);
155 writeb(mask, mask_addr);
159 static void vsc_sata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
161 struct ata_ioports *ioaddr = &ap->ioaddr;
162 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
165 * The only thing the ctl register is used for is SRST.
166 * That is not enabled or disabled via tf_load.
167 * However, if ATA_NIEN is changed, then we need to change
168 * the interrupt register.
170 if ((tf->ctl & ATA_NIEN) != (ap->last_ctl & ATA_NIEN)) {
171 ap->last_ctl = tf->ctl;
172 vsc_intr_mask_update(ap, tf->ctl & ATA_NIEN);
174 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
175 writew(tf->feature | (((u16)tf->hob_feature) << 8),
176 ioaddr->feature_addr);
177 writew(tf->nsect | (((u16)tf->hob_nsect) << 8),
179 writew(tf->lbal | (((u16)tf->hob_lbal) << 8),
181 writew(tf->lbam | (((u16)tf->hob_lbam) << 8),
183 writew(tf->lbah | (((u16)tf->hob_lbah) << 8),
185 } else if (is_addr) {
186 writew(tf->feature, ioaddr->feature_addr);
187 writew(tf->nsect, ioaddr->nsect_addr);
188 writew(tf->lbal, ioaddr->lbal_addr);
189 writew(tf->lbam, ioaddr->lbam_addr);
190 writew(tf->lbah, ioaddr->lbah_addr);
193 if (tf->flags & ATA_TFLAG_DEVICE)
194 writeb(tf->device, ioaddr->device_addr);
200 static void vsc_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
202 struct ata_ioports *ioaddr = &ap->ioaddr;
203 u16 nsect, lbal, lbam, lbah, feature;
205 tf->command = ata_sff_check_status(ap);
206 tf->device = readw(ioaddr->device_addr);
207 feature = readw(ioaddr->error_addr);
208 nsect = readw(ioaddr->nsect_addr);
209 lbal = readw(ioaddr->lbal_addr);
210 lbam = readw(ioaddr->lbam_addr);
211 lbah = readw(ioaddr->lbah_addr);
213 tf->feature = feature;
219 if (tf->flags & ATA_TFLAG_LBA48) {
220 tf->hob_feature = feature >> 8;
221 tf->hob_nsect = nsect >> 8;
222 tf->hob_lbal = lbal >> 8;
223 tf->hob_lbam = lbam >> 8;
224 tf->hob_lbah = lbah >> 8;
228 static inline void vsc_error_intr(u8 port_status, struct ata_port *ap)
230 if (port_status & (VSC_SATA_INT_PHY_CHANGE | VSC_SATA_INT_ERROR_M))
236 static void vsc_port_intr(u8 port_status, struct ata_port *ap)
238 struct ata_queued_cmd *qc;
241 if (unlikely(port_status & VSC_SATA_INT_ERROR)) {
242 vsc_error_intr(port_status, ap);
246 qc = ata_qc_from_tag(ap, ap->link.active_tag);
247 if (qc && likely(!(qc->tf.flags & ATA_TFLAG_POLLING)))
248 handled = ata_bmdma_port_intr(ap, qc);
250 /* We received an interrupt during a polled command,
251 * or some other spurious condition. Interrupt reporting
252 * with this hardware is fairly reliable so it is safe to
253 * simply clear the interrupt
255 if (unlikely(!handled))
256 ap->ops->sff_check_status(ap);
262 * Read the interrupt register and process for the devices that have
265 static irqreturn_t vsc_sata_interrupt(int irq, void *dev_instance)
267 struct ata_host *host = dev_instance;
269 unsigned int handled = 0;
272 status = readl(host->iomap[VSC_MMIO_BAR] + VSC_SATA_INT_STAT_OFFSET);
274 if (unlikely(status == 0xffffffff || status == 0)) {
277 ": IRQ status == 0xffffffff, PCI fault or device removal?\n");
281 spin_lock(&host->lock);
283 for (i = 0; i < host->n_ports; i++) {
284 u8 port_status = (status >> (8 * i)) & 0xff;
286 vsc_port_intr(port_status, host->ports[i]);
291 spin_unlock(&host->lock);
293 return IRQ_RETVAL(handled);
297 static struct scsi_host_template vsc_sata_sht = {
298 ATA_BMDMA_SHT(DRV_NAME),
302 static struct ata_port_operations vsc_sata_ops = {
303 .inherits = &ata_bmdma_port_ops,
304 /* The IRQ handling is not quite standard SFF behaviour so we
305 cannot use the default lost interrupt handler */
306 .lost_interrupt = ATA_OP_NULL,
307 .sff_tf_load = vsc_sata_tf_load,
308 .sff_tf_read = vsc_sata_tf_read,
309 .freeze = vsc_freeze,
311 .scr_read = vsc_sata_scr_read,
312 .scr_write = vsc_sata_scr_write,
315 static void __devinit vsc_sata_setup_port(struct ata_ioports *port,
318 port->cmd_addr = base + VSC_SATA_TF_CMD_OFFSET;
319 port->data_addr = base + VSC_SATA_TF_DATA_OFFSET;
320 port->error_addr = base + VSC_SATA_TF_ERROR_OFFSET;
321 port->feature_addr = base + VSC_SATA_TF_FEATURE_OFFSET;
322 port->nsect_addr = base + VSC_SATA_TF_NSECT_OFFSET;
323 port->lbal_addr = base + VSC_SATA_TF_LBAL_OFFSET;
324 port->lbam_addr = base + VSC_SATA_TF_LBAM_OFFSET;
325 port->lbah_addr = base + VSC_SATA_TF_LBAH_OFFSET;
326 port->device_addr = base + VSC_SATA_TF_DEVICE_OFFSET;
327 port->status_addr = base + VSC_SATA_TF_STATUS_OFFSET;
328 port->command_addr = base + VSC_SATA_TF_COMMAND_OFFSET;
329 port->altstatus_addr = base + VSC_SATA_TF_ALTSTATUS_OFFSET;
330 port->ctl_addr = base + VSC_SATA_TF_CTL_OFFSET;
331 port->bmdma_addr = base + VSC_SATA_DMA_CMD_OFFSET;
332 port->scr_addr = base + VSC_SATA_SCR_STATUS_OFFSET;
333 writel(0, base + VSC_SATA_UP_DESCRIPTOR_OFFSET);
334 writel(0, base + VSC_SATA_UP_DATA_BUFFER_OFFSET);
338 static int __devinit vsc_sata_init_one(struct pci_dev *pdev,
339 const struct pci_device_id *ent)
341 static const struct ata_port_info pi = {
342 .flags = ATA_FLAG_SATA,
343 .pio_mask = ATA_PIO4,
344 .mwdma_mask = ATA_MWDMA2,
345 .udma_mask = ATA_UDMA6,
346 .port_ops = &vsc_sata_ops,
348 const struct ata_port_info *ppi[] = { &pi, NULL };
349 struct ata_host *host;
350 void __iomem *mmio_base;
354 ata_print_version_once(&pdev->dev, DRV_VERSION);
357 host = ata_host_alloc_pinfo(&pdev->dev, ppi, 4);
361 rc = pcim_enable_device(pdev);
365 /* check if we have needed resource mapped */
366 if (pci_resource_len(pdev, 0) == 0)
369 /* map IO regions and initialize host accordingly */
370 rc = pcim_iomap_regions(pdev, 1 << VSC_MMIO_BAR, DRV_NAME);
372 pcim_pin_device(pdev);
375 host->iomap = pcim_iomap_table(pdev);
377 mmio_base = host->iomap[VSC_MMIO_BAR];
379 for (i = 0; i < host->n_ports; i++) {
380 struct ata_port *ap = host->ports[i];
381 unsigned int offset = (i + 1) * VSC_SATA_PORT_OFFSET;
383 vsc_sata_setup_port(&ap->ioaddr, mmio_base + offset);
385 ata_port_pbar_desc(ap, VSC_MMIO_BAR, -1, "mmio");
386 ata_port_pbar_desc(ap, VSC_MMIO_BAR, offset, "port");
390 * Use 32 bit DMA mask, because 64 bit address support is poor.
392 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
395 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
400 * Due to a bug in the chip, the default cache line size can't be
401 * used (unless the default is non-zero).
403 pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &cls);
405 pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, 0x80);
407 if (pci_enable_msi(pdev) == 0)
411 * Config offset 0x98 is "Extended Control and Status Register 0"
412 * Default value is (1 << 28). All bits except bit 28 are reserved in
413 * DPA mode. If bit 28 is set, LED 0 reflects all ports' activity.
414 * If bit 28 is clear, each port has its own LED.
416 pci_write_config_dword(pdev, 0x98, 0);
418 pci_set_master(pdev);
419 return ata_host_activate(host, pdev->irq, vsc_sata_interrupt,
420 IRQF_SHARED, &vsc_sata_sht);
423 static const struct pci_device_id vsc_sata_pci_tbl[] = {
424 { PCI_VENDOR_ID_VITESSE, 0x7174,
425 PCI_ANY_ID, PCI_ANY_ID, 0x10600, 0xFFFFFF, 0 },
426 { PCI_VENDOR_ID_INTEL, 0x3200,
427 PCI_ANY_ID, PCI_ANY_ID, 0x10600, 0xFFFFFF, 0 },
429 { } /* terminate list */
432 static struct pci_driver vsc_sata_pci_driver = {
434 .id_table = vsc_sata_pci_tbl,
435 .probe = vsc_sata_init_one,
436 .remove = ata_pci_remove_one,
439 static int __init vsc_sata_init(void)
441 return pci_register_driver(&vsc_sata_pci_driver);
444 static void __exit vsc_sata_exit(void)
446 pci_unregister_driver(&vsc_sata_pci_driver);
449 MODULE_AUTHOR("Jeremy Higdon");
450 MODULE_DESCRIPTION("low-level driver for Vitesse VSC7174 SATA controller");
451 MODULE_LICENSE("GPL");
452 MODULE_DEVICE_TABLE(pci, vsc_sata_pci_tbl);
453 MODULE_VERSION(DRV_VERSION);
455 module_init(vsc_sata_init);
456 module_exit(vsc_sata_exit);