1/*
2 * ACPI PATA driver
3 *
4 * (c) 2007 Red Hat
5 */
6
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/pci.h>
10#include <linux/blkdev.h>
11#include <linux/delay.h>
12#include <linux/device.h>
13#include <linux/gfp.h>
14#include <linux/acpi.h>
15#include <linux/libata.h>
16#include <linux/ata.h>
17#include <scsi/scsi_host.h>
18
19#define DRV_NAME "pata_acpi"
20#define DRV_VERSION "0.2.3"
21
22struct pata_acpi {
23 struct ata_acpi_gtm gtm;
24 void *last;
25 unsigned long mask[2];
26};
27
28/**
29 * pacpi_pre_reset - check for 40/80 pin
30 * @ap: Port
31 * @deadline: deadline jiffies for the operation
32 *
33 * Perform the PATA port setup we need.
34 */
35
36static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
37{
38 struct ata_port *ap = link->ap;
39 struct pata_acpi *acpi = ap->private_data;
40 if (ACPI_HANDLE(&ap->tdev) == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0)
41 return -ENODEV;
42
43 return ata_sff_prereset(link, deadline);
44}
45
46/**
47 * pacpi_cable_detect - cable type detection
48 * @ap: port to detect
49 *
50 * Perform device specific cable detection
51 */
52
53static int pacpi_cable_detect(struct ata_port *ap)
54{
55 struct pata_acpi *acpi = ap->private_data;
56
57 if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
58 return ATA_CBL_PATA80;
59 else
60 return ATA_CBL_PATA40;
61}
62
63/**
64 * pacpi_discover_modes - filter non ACPI modes
65 * @adev: ATA device
66 * @mask: proposed modes
67 *
68 * Try the modes available and see which ones the ACPI method will
69 * set up sensibly. From this we get a mask of ACPI modes we can use
70 */
71
72static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
73{
74 struct pata_acpi *acpi = ap->private_data;
75 struct ata_acpi_gtm probe;
76 unsigned int xfer_mask;
77
78 probe = acpi->gtm;
79
80 ata_acpi_gtm(ap, &probe);
81
82 xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
83
84 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
85 ap->cbl = ATA_CBL_PATA80;
86
87 return xfer_mask;
88}
89
90/**
91 * pacpi_mode_filter - mode filter for ACPI
92 * @adev: device
93 * @mask: mask of valid modes
94 *
95 * Filter the valid mode list according to our own specific rules, in
96 * this case the list of discovered valid modes obtained by ACPI probing
97 */
98
99static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
100{
101 struct pata_acpi *acpi = adev->link->ap->private_data;
102 return mask & acpi->mask[adev->devno];
103}
104
105/**
106 * pacpi_set_piomode - set initial PIO mode data
107 * @ap: ATA interface
108 * @adev: ATA device
109 */
110
111static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
112{
113 int unit = adev->devno;
114 struct pata_acpi *acpi = ap->private_data;
115 const struct ata_timing *t;
116
117 if (!(acpi->gtm.flags & 0x10))
118 unit = 0;
119
120 /* Now stuff the nS values into the structure */
121 t = ata_timing_find_mode(adev->pio_mode);
122 acpi->gtm.drive[unit].pio = t->cycle;
123 ata_acpi_stm(ap, &acpi->gtm);
124 /* See what mode we actually got */
125 ata_acpi_gtm(ap, &acpi->gtm);
126}
127
128/**
129 * pacpi_set_dmamode - set initial DMA mode data
130 * @ap: ATA interface
131 * @adev: ATA device
132 */
133
134static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
135{
136 int unit = adev->devno;
137 struct pata_acpi *acpi = ap->private_data;
138 const struct ata_timing *t;
139
140 if (!(acpi->gtm.flags & 0x10))
141 unit = 0;
142
143 /* Now stuff the nS values into the structure */
144 t = ata_timing_find_mode(adev->dma_mode);
145 if (adev->dma_mode >= XFER_UDMA_0) {
146 acpi->gtm.drive[unit].dma = t->udma;
147 acpi->gtm.flags |= (1 << (2 * unit));
148 } else {
149 acpi->gtm.drive[unit].dma = t->cycle;
150 acpi->gtm.flags &= ~(1 << (2 * unit));
151 }
152 ata_acpi_stm(ap, &acpi->gtm);
153 /* See what mode we actually got */
154 ata_acpi_gtm(ap, &acpi->gtm);
155}
156
157/**
158 * pacpi_qc_issue - command issue
159 * @qc: command pending
160 *
161 * Called when the libata layer is about to issue a command. We wrap
162 * this interface so that we can load the correct ATA timings if
163 * necessary.
164 */
165
166static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
167{
168 struct ata_port *ap = qc->ap;
169 struct ata_device *adev = qc->dev;
170 struct pata_acpi *acpi = ap->private_data;
171
172 if (acpi->gtm.flags & 0x10)
173 return ata_bmdma_qc_issue(qc);
174
175 if (adev != acpi->last) {
176 pacpi_set_piomode(ap, adev);
177 if (ata_dma_enabled(adev))
178 pacpi_set_dmamode(ap, adev);
179 acpi->last = adev;
180 }
181 return ata_bmdma_qc_issue(qc);
182}
183
184/**
185 * pacpi_port_start - port setup
186 * @ap: ATA port being set up
187 *
188 * Use the port_start hook to maintain private control structures
189 */
190
191static int pacpi_port_start(struct ata_port *ap)
192{
193 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
194 struct pata_acpi *acpi;
195
196 if (ACPI_HANDLE(&ap->tdev) == NULL)
197 return -ENODEV;
198
199 acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
200 if (ap->private_data == NULL)
201 return -ENOMEM;
202 acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
203 acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
204 return ata_bmdma_port_start(ap);
205}
206
207static struct scsi_host_template pacpi_sht = {
208 ATA_BMDMA_SHT(DRV_NAME),
209};
210
211static struct ata_port_operations pacpi_ops = {
212 .inherits = &ata_bmdma_port_ops,
213 .qc_issue = pacpi_qc_issue,
214 .cable_detect = pacpi_cable_detect,
215 .mode_filter = pacpi_mode_filter,
216 .set_piomode = pacpi_set_piomode,
217 .set_dmamode = pacpi_set_dmamode,
218 .prereset = pacpi_pre_reset,
219 .port_start = pacpi_port_start,
220};
221
222
223/**
224 * pacpi_init_one - Register ACPI ATA PCI device with kernel services
225 * @pdev: PCI device to register
226 * @ent: Entry in pacpi_pci_tbl matching with @pdev
227 *
228 * Called from kernel PCI layer.
229 *
230 * LOCKING:
231 * Inherited from PCI layer (may sleep).
232 *
233 * RETURNS:
234 * Zero on success, or -ERRNO value.
235 */
236
237static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
238{
239 static const struct ata_port_info info = {
240 .flags = ATA_FLAG_SLAVE_POSS,
241
242 .pio_mask = ATA_PIO4,
243 .mwdma_mask = ATA_MWDMA2,
244 .udma_mask = ATA_UDMA6,
245
246 .port_ops = &pacpi_ops,
247 };
248 const struct ata_port_info *ppi[] = { &info, NULL };
249 if (pdev->vendor == PCI_VENDOR_ID_ATI) {
250 int rc = pcim_enable_device(pdev);
251 if (rc < 0)
252 return rc;
253 pcim_pin_device(pdev);
254 }
255 return ata_pci_bmdma_init_one(pdev, ppi, &pacpi_sht, NULL, 0);
256}
257
258static const struct pci_device_id pacpi_pci_tbl[] = {
259 { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
260 { } /* terminate list */
261};
262
263static struct pci_driver pacpi_pci_driver = {
264 .name = DRV_NAME,
265 .id_table = pacpi_pci_tbl,
266 .probe = pacpi_init_one,
267 .remove = ata_pci_remove_one,
268#ifdef CONFIG_PM_SLEEP
269 .suspend = ata_pci_device_suspend,
270 .resume = ata_pci_device_resume,
271#endif
272};
273
274module_pci_driver(pacpi_pci_driver);
275
276MODULE_AUTHOR("Alan Cox");
277MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
278MODULE_LICENSE("GPL");
279MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
280MODULE_VERSION(DRV_VERSION);
281