ia64/kvm: compilation fix. export account_system_vtime.
[pv_ops_mirror.git] / drivers / ata / pata_acpi.c
blobfbe605711554a24dd1ae23be66d02128c8193b18
1 /*
2 * ACPI PATA driver
4 * (c) 2007 Red Hat <alan@redhat.com>
5 */
7 #include <linux/kernel.h>
8 #include <linux/module.h>
9 #include <linux/pci.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"
29 struct pata_acpi {
30 struct ata_acpi_gtm gtm;
31 void *last;
32 unsigned long mask[2];
35 /**
36 * pacpi_pre_reset - check for 40/80 pin
37 * @ap: Port
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)
48 return -ENODEV;
50 return ata_sff_prereset(link, deadline);
53 /**
54 * pacpi_cable_detect - cable type detection
55 * @ap: port to detect
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;
66 else
67 return ATA_CBL_PATA40;
70 /**
71 * pacpi_discover_modes - filter non ACPI modes
72 * @adev: ATA device
73 * @mask: proposed modes
75 * Try the modes available and see which ones the ACPI method will
76 * set up sensibly. From this we get a mask of ACPI modes we can use
79 static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
81 struct pata_acpi *acpi = ap->private_data;
82 struct ata_acpi_gtm probe;
83 unsigned int xfer_mask;
85 probe = acpi->gtm;
87 ata_acpi_gtm(ap, &probe);
89 xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
91 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
92 ap->cbl = ATA_CBL_PATA80;
94 return xfer_mask;
97 /**
98 * pacpi_mode_filter - mode filter for ACPI
99 * @adev: device
100 * @mask: mask of valid modes
102 * Filter the valid mode list according to our own specific rules, in
103 * this case the list of discovered valid modes obtained by ACPI probing
106 static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
108 struct pata_acpi *acpi = adev->link->ap->private_data;
109 return ata_bmdma_mode_filter(adev, mask & acpi->mask[adev->devno]);
113 * pacpi_set_piomode - set initial PIO mode data
114 * @ap: ATA interface
115 * @adev: ATA device
118 static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
120 int unit = adev->devno;
121 struct pata_acpi *acpi = ap->private_data;
122 const struct ata_timing *t;
124 if (!(acpi->gtm.flags & 0x10))
125 unit = 0;
127 /* Now stuff the nS values into the structure */
128 t = ata_timing_find_mode(adev->pio_mode);
129 acpi->gtm.drive[unit].pio = t->cycle;
130 ata_acpi_stm(ap, &acpi->gtm);
131 /* See what mode we actually got */
132 ata_acpi_gtm(ap, &acpi->gtm);
136 * pacpi_set_dmamode - set initial DMA mode data
137 * @ap: ATA interface
138 * @adev: ATA device
141 static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
143 int unit = adev->devno;
144 struct pata_acpi *acpi = ap->private_data;
145 const struct ata_timing *t;
147 if (!(acpi->gtm.flags & 0x10))
148 unit = 0;
150 /* Now stuff the nS values into the structure */
151 t = ata_timing_find_mode(adev->dma_mode);
152 if (adev->dma_mode >= XFER_UDMA_0) {
153 acpi->gtm.drive[unit].dma = t->udma;
154 acpi->gtm.flags |= (1 << (2 * unit));
155 } else {
156 acpi->gtm.drive[unit].dma = t->cycle;
157 acpi->gtm.flags &= ~(1 << (2 * unit));
159 ata_acpi_stm(ap, &acpi->gtm);
160 /* See what mode we actually got */
161 ata_acpi_gtm(ap, &acpi->gtm);
165 * pacpi_qc_issue - command issue
166 * @qc: command pending
168 * Called when the libata layer is about to issue a command. We wrap
169 * this interface so that we can load the correct ATA timings if
170 * neccessary.
173 static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
175 struct ata_port *ap = qc->ap;
176 struct ata_device *adev = qc->dev;
177 struct pata_acpi *acpi = ap->private_data;
179 if (acpi->gtm.flags & 0x10)
180 return ata_sff_qc_issue(qc);
182 if (adev != acpi->last) {
183 pacpi_set_piomode(ap, adev);
184 if (adev->dma_mode)
185 pacpi_set_dmamode(ap, adev);
186 acpi->last = adev;
188 return ata_sff_qc_issue(qc);
192 * pacpi_port_start - port setup
193 * @ap: ATA port being set up
195 * Use the port_start hook to maintain private control structures
198 static int pacpi_port_start(struct ata_port *ap)
200 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
201 struct pata_acpi *acpi;
203 int ret;
205 if (ap->acpi_handle == NULL)
206 return -ENODEV;
208 acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
209 if (ap->private_data == NULL)
210 return -ENOMEM;
211 acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
212 acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
213 ret = ata_sff_port_start(ap);
214 if (ret < 0)
215 return ret;
217 return ret;
220 static struct scsi_host_template pacpi_sht = {
221 ATA_BMDMA_SHT(DRV_NAME),
224 static struct ata_port_operations pacpi_ops = {
225 .inherits = &ata_bmdma_port_ops,
226 .qc_issue = pacpi_qc_issue,
227 .cable_detect = pacpi_cable_detect,
228 .mode_filter = pacpi_mode_filter,
229 .set_piomode = pacpi_set_piomode,
230 .set_dmamode = pacpi_set_dmamode,
231 .prereset = pacpi_pre_reset,
232 .port_start = pacpi_port_start,
237 * pacpi_init_one - Register ACPI ATA PCI device with kernel services
238 * @pdev: PCI device to register
239 * @ent: Entry in pacpi_pci_tbl matching with @pdev
241 * Called from kernel PCI layer.
243 * LOCKING:
244 * Inherited from PCI layer (may sleep).
246 * RETURNS:
247 * Zero on success, or -ERRNO value.
250 static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
252 static const struct ata_port_info info = {
253 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
255 .pio_mask = 0x1f,
256 .mwdma_mask = 0x07,
257 .udma_mask = 0x7f,
259 .port_ops = &pacpi_ops,
261 const struct ata_port_info *ppi[] = { &info, NULL };
262 if (pdev->vendor == PCI_VENDOR_ID_ATI) {
263 int rc = pcim_enable_device(pdev);
264 if (rc < 0)
265 return rc;
266 pcim_pin_device(pdev);
268 return ata_pci_sff_init_one(pdev, ppi, &pacpi_sht, NULL);
271 static const struct pci_device_id pacpi_pci_tbl[] = {
272 { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
273 { } /* terminate list */
276 static struct pci_driver pacpi_pci_driver = {
277 .name = DRV_NAME,
278 .id_table = pacpi_pci_tbl,
279 .probe = pacpi_init_one,
280 .remove = ata_pci_remove_one,
281 #ifdef CONFIG_PM
282 .suspend = ata_pci_device_suspend,
283 .resume = ata_pci_device_resume,
284 #endif
287 static int __init pacpi_init(void)
289 return pci_register_driver(&pacpi_pci_driver);
292 static void __exit pacpi_exit(void)
294 pci_unregister_driver(&pacpi_pci_driver);
297 module_init(pacpi_init);
298 module_exit(pacpi_exit);
300 MODULE_AUTHOR("Alan Cox");
301 MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
302 MODULE_LICENSE("GPL");
303 MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
304 MODULE_VERSION(DRV_VERSION);