4 * (c) 2007 Red Hat <alan@redhat.com>
7 #include <linux/kernel.h>
8 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/blkdev.h>
12 #include <linux/delay.h>
13 #include <linux/device.h>
14 #include <scsi/scsi_host.h>
15 #include <acpi/acpi_bus.h>
16 #include <acpi/acnames.h>
17 #include <acpi/acnamesp.h>
18 #include <acpi/acparser.h>
19 #include <acpi/acexcep.h>
20 #include <acpi/acmacros.h>
21 #include <acpi/actypes.h>
23 #include <linux/libata.h>
24 #include <linux/ata.h>
26 #define DRV_NAME "pata_acpi"
27 #define DRV_VERSION "0.2.3"
30 struct ata_acpi_gtm gtm;
32 unsigned long mask[2];
36 * pacpi_pre_reset - check for 40/80 pin
38 * @deadline: deadline jiffies for the operation
40 * Perform the PATA port setup we need.
43 static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
45 struct ata_port *ap = link->ap;
46 struct pata_acpi *acpi = ap->private_data;
47 if (ap->acpi_handle == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0)
50 return ata_std_prereset(link, deadline);
54 * pacpi_cable_detect - cable type detection
57 * Perform device specific cable detection
60 static int pacpi_cable_detect(struct ata_port *ap)
62 struct pata_acpi *acpi = ap->private_data;
64 if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
65 return ATA_CBL_PATA80;
67 return ATA_CBL_PATA40;
71 * pacpi_error_handler - Setup and error handler
75 * None (inherited from caller).
78 static void pacpi_error_handler(struct ata_port *ap)
80 return ata_bmdma_drive_eh(ap, pacpi_pre_reset, ata_std_softreset,
81 NULL, ata_std_postreset);
85 * pacpi_discover_modes - filter non ACPI modes
87 * @mask: proposed modes
89 * Try the modes available and see which ones the ACPI method will
90 * set up sensibly. From this we get a mask of ACPI modes we can use
93 static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
95 struct pata_acpi *acpi = ap->private_data;
96 struct ata_acpi_gtm probe;
97 unsigned int xfer_mask;
101 ata_acpi_gtm(ap, &probe);
103 xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
105 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
106 ap->cbl = ATA_CBL_PATA80;
112 * pacpi_mode_filter - mode filter for ACPI
114 * @mask: mask of valid modes
116 * Filter the valid mode list according to our own specific rules, in
117 * this case the list of discovered valid modes obtained by ACPI probing
120 static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
122 struct pata_acpi *acpi = adev->link->ap->private_data;
123 return ata_pci_default_filter(adev, mask & acpi->mask[adev->devno]);
127 * pacpi_set_piomode - set initial PIO mode data
132 static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
134 int unit = adev->devno;
135 struct pata_acpi *acpi = ap->private_data;
137 if (!(acpi->gtm.flags & 0x10))
140 /* Now stuff the nS values into the structure */
141 acpi->gtm.drive[unit].pio =
142 ata_acpi_pio_cycle[adev->pio_mode - XFER_PIO_0];
143 ata_acpi_stm(ap, &acpi->gtm);
144 /* See what mode we actually got */
145 ata_acpi_gtm(ap, &acpi->gtm);
149 * pacpi_set_dmamode - set initial DMA mode data
154 static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
156 int unit = adev->devno;
157 struct pata_acpi *acpi = ap->private_data;
159 if (!(acpi->gtm.flags & 0x10))
162 /* Now stuff the nS values into the structure */
163 if (adev->dma_mode >= XFER_UDMA_0) {
164 acpi->gtm.drive[unit].dma =
165 ata_acpi_udma_cycle[adev->dma_mode - XFER_UDMA_0];
166 acpi->gtm.flags |= (1 << (2 * unit));
168 acpi->gtm.drive[unit].dma =
169 ata_acpi_mwdma_cycle[adev->dma_mode - XFER_MW_DMA_0];
170 acpi->gtm.flags &= ~(1 << (2 * unit));
172 ata_acpi_stm(ap, &acpi->gtm);
173 /* See what mode we actually got */
174 ata_acpi_gtm(ap, &acpi->gtm);
178 * pacpi_qc_issue_prot - command issue
179 * @qc: command pending
181 * Called when the libata layer is about to issue a command. We wrap
182 * this interface so that we can load the correct ATA timings if
186 static unsigned int pacpi_qc_issue_prot(struct ata_queued_cmd *qc)
188 struct ata_port *ap = qc->ap;
189 struct ata_device *adev = qc->dev;
190 struct pata_acpi *acpi = ap->private_data;
192 if (acpi->gtm.flags & 0x10)
193 return ata_qc_issue_prot(qc);
195 if (adev != acpi->last) {
196 pacpi_set_piomode(ap, adev);
198 pacpi_set_dmamode(ap, adev);
201 return ata_qc_issue_prot(qc);
205 * pacpi_port_start - port setup
206 * @ap: ATA port being set up
208 * Use the port_start hook to maintain private control structures
211 static int pacpi_port_start(struct ata_port *ap)
213 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
214 struct pata_acpi *acpi;
218 if (ap->acpi_handle == NULL)
221 acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
222 if (ap->private_data == NULL)
224 acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
225 acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
226 ret = ata_sff_port_start(ap);
233 static struct scsi_host_template pacpi_sht = {
234 .module = THIS_MODULE,
236 .ioctl = ata_scsi_ioctl,
237 .queuecommand = ata_scsi_queuecmd,
238 .can_queue = ATA_DEF_QUEUE,
239 .this_id = ATA_SHT_THIS_ID,
240 .sg_tablesize = LIBATA_MAX_PRD,
241 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
242 .emulated = ATA_SHT_EMULATED,
243 .use_clustering = ATA_SHT_USE_CLUSTERING,
244 .proc_name = DRV_NAME,
245 .dma_boundary = ATA_DMA_BOUNDARY,
246 .slave_configure = ata_scsi_slave_config,
247 .slave_destroy = ata_scsi_slave_destroy,
248 /* Use standard CHS mapping rules */
249 .bios_param = ata_std_bios_param,
252 static const struct ata_port_operations pacpi_ops = {
253 .set_piomode = pacpi_set_piomode,
254 .set_dmamode = pacpi_set_dmamode,
255 .mode_filter = pacpi_mode_filter,
257 /* Task file is PCI ATA format, use helpers */
258 .tf_load = ata_tf_load,
259 .tf_read = ata_tf_read,
260 .check_status = ata_check_status,
261 .exec_command = ata_exec_command,
262 .dev_select = ata_std_dev_select,
264 .freeze = ata_bmdma_freeze,
265 .thaw = ata_bmdma_thaw,
266 .error_handler = pacpi_error_handler,
267 .post_internal_cmd = ata_bmdma_post_internal_cmd,
268 .cable_detect = pacpi_cable_detect,
270 /* BMDMA handling is PCI ATA format, use helpers */
271 .bmdma_setup = ata_bmdma_setup,
272 .bmdma_start = ata_bmdma_start,
273 .bmdma_stop = ata_bmdma_stop,
274 .bmdma_status = ata_bmdma_status,
275 .qc_prep = ata_qc_prep,
276 .qc_issue = pacpi_qc_issue_prot,
277 .data_xfer = ata_data_xfer,
279 /* Timeout handling */
280 .irq_handler = ata_interrupt,
281 .irq_clear = ata_bmdma_irq_clear,
282 .irq_on = ata_irq_on,
284 /* Generic PATA PCI ATA helpers */
285 .port_start = pacpi_port_start,
290 * pacpi_init_one - Register ACPI ATA PCI device with kernel services
291 * @pdev: PCI device to register
292 * @ent: Entry in pacpi_pci_tbl matching with @pdev
294 * Called from kernel PCI layer.
297 * Inherited from PCI layer (may sleep).
300 * Zero on success, or -ERRNO value.
303 static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
305 static const struct ata_port_info info = {
307 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
313 .port_ops = &pacpi_ops,
315 const struct ata_port_info *ppi[] = { &info, NULL };
316 return ata_pci_init_one(pdev, ppi);
319 static const struct pci_device_id pacpi_pci_tbl[] = {
320 { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
321 { } /* terminate list */
324 static struct pci_driver pacpi_pci_driver = {
326 .id_table = pacpi_pci_tbl,
327 .probe = pacpi_init_one,
328 .remove = ata_pci_remove_one,
330 .suspend = ata_pci_device_suspend,
331 .resume = ata_pci_device_resume,
335 static int __init pacpi_init(void)
337 return pci_register_driver(&pacpi_pci_driver);
340 static void __exit pacpi_exit(void)
342 pci_unregister_driver(&pacpi_pci_driver);
345 module_init(pacpi_init);
346 module_exit(pacpi_exit);
348 MODULE_AUTHOR("Alan Cox");
349 MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
350 MODULE_LICENSE("GPL");
351 MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
352 MODULE_VERSION(DRV_VERSION);