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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
17#include <linux/libata.h>
18#include <linux/ata.h>
19
20#define DRV_NAME "pata_acpi"
21#define DRV_VERSION "0.2.3"
22
23struct pata_acpi {
24 struct ata_acpi_gtm gtm;
25 void *last;
26 unsigned long mask[2];
27};
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37static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
38{
39 struct ata_port *ap = link->ap;
40 struct pata_acpi *acpi = ap->private_data;
41 if (ap->acpi_handle == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0)
42 return -ENODEV;
43
44 return ata_sff_prereset(link, deadline);
45}
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54static int pacpi_cable_detect(struct ata_port *ap)
55{
56 struct pata_acpi *acpi = ap->private_data;
57
58 if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
59 return ATA_CBL_PATA80;
60 else
61 return ATA_CBL_PATA40;
62}
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72
73static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
74{
75 struct pata_acpi *acpi = ap->private_data;
76 struct ata_acpi_gtm probe;
77 unsigned int xfer_mask;
78
79 probe = acpi->gtm;
80
81 ata_acpi_gtm(ap, &probe);
82
83 xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
84
85 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
86 ap->cbl = ATA_CBL_PATA80;
87
88 return xfer_mask;
89}
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100static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
101{
102 struct pata_acpi *acpi = adev->link->ap->private_data;
103 return ata_bmdma_mode_filter(adev, mask & acpi->mask[adev->devno]);
104}
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112static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
113{
114 int unit = adev->devno;
115 struct pata_acpi *acpi = ap->private_data;
116 const struct ata_timing *t;
117
118 if (!(acpi->gtm.flags & 0x10))
119 unit = 0;
120
121
122 t = ata_timing_find_mode(adev->pio_mode);
123 acpi->gtm.drive[unit].pio = t->cycle;
124 ata_acpi_stm(ap, &acpi->gtm);
125
126 ata_acpi_gtm(ap, &acpi->gtm);
127}
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135static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
136{
137 int unit = adev->devno;
138 struct pata_acpi *acpi = ap->private_data;
139 const struct ata_timing *t;
140
141 if (!(acpi->gtm.flags & 0x10))
142 unit = 0;
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145 t = ata_timing_find_mode(adev->dma_mode);
146 if (adev->dma_mode >= XFER_UDMA_0) {
147 acpi->gtm.drive[unit].dma = t->udma;
148 acpi->gtm.flags |= (1 << (2 * unit));
149 } else {
150 acpi->gtm.drive[unit].dma = t->cycle;
151 acpi->gtm.flags &= ~(1 << (2 * unit));
152 }
153 ata_acpi_stm(ap, &acpi->gtm);
154
155 ata_acpi_gtm(ap, &acpi->gtm);
156}
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166
167static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
168{
169 struct ata_port *ap = qc->ap;
170 struct ata_device *adev = qc->dev;
171 struct pata_acpi *acpi = ap->private_data;
172
173 if (acpi->gtm.flags & 0x10)
174 return ata_sff_qc_issue(qc);
175
176 if (adev != acpi->last) {
177 pacpi_set_piomode(ap, adev);
178 if (ata_dma_enabled(adev))
179 pacpi_set_dmamode(ap, adev);
180 acpi->last = adev;
181 }
182 return ata_sff_qc_issue(qc);
183}
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192static int pacpi_port_start(struct ata_port *ap)
193{
194 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
195 struct pata_acpi *acpi;
196
197 int ret;
198
199 if (ap->acpi_handle == NULL)
200 return -ENODEV;
201
202 acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
203 if (ap->private_data == NULL)
204 return -ENOMEM;
205 acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
206 acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
207 ret = ata_sff_port_start(ap);
208 if (ret < 0)
209 return ret;
210
211 return ret;
212}
213
214static struct scsi_host_template pacpi_sht = {
215 ATA_BMDMA_SHT(DRV_NAME),
216};
217
218static struct ata_port_operations pacpi_ops = {
219 .inherits = &ata_bmdma_port_ops,
220 .qc_issue = pacpi_qc_issue,
221 .cable_detect = pacpi_cable_detect,
222 .mode_filter = pacpi_mode_filter,
223 .set_piomode = pacpi_set_piomode,
224 .set_dmamode = pacpi_set_dmamode,
225 .prereset = pacpi_pre_reset,
226 .port_start = pacpi_port_start,
227};
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244static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
245{
246 static const struct ata_port_info info = {
247 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
248
249 .pio_mask = ATA_PIO4,
250 .mwdma_mask = ATA_MWDMA2,
251 .udma_mask = ATA_UDMA6,
252
253 .port_ops = &pacpi_ops,
254 };
255 const struct ata_port_info *ppi[] = { &info, NULL };
256 if (pdev->vendor == PCI_VENDOR_ID_ATI) {
257 int rc = pcim_enable_device(pdev);
258 if (rc < 0)
259 return rc;
260 pcim_pin_device(pdev);
261 }
262 return ata_pci_sff_init_one(pdev, ppi, &pacpi_sht, NULL);
263}
264
265static const struct pci_device_id pacpi_pci_tbl[] = {
266 { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
267 { }
268};
269
270static struct pci_driver pacpi_pci_driver = {
271 .name = DRV_NAME,
272 .id_table = pacpi_pci_tbl,
273 .probe = pacpi_init_one,
274 .remove = ata_pci_remove_one,
275#ifdef CONFIG_PM
276 .suspend = ata_pci_device_suspend,
277 .resume = ata_pci_device_resume,
278#endif
279};
280
281static int __init pacpi_init(void)
282{
283 return pci_register_driver(&pacpi_pci_driver);
284}
285
286static void __exit pacpi_exit(void)
287{
288 pci_unregister_driver(&pacpi_pci_driver);
289}
290
291module_init(pacpi_init);
292module_exit(pacpi_exit);
293
294MODULE_AUTHOR("Alan Cox");
295MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
296MODULE_LICENSE("GPL");
297MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
298MODULE_VERSION(DRV_VERSION);
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