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Alan Cox025621f2007-10-04 21:32:58 +01001/*
2 * ACPI PATA driver
3 *
4 * (c) 2007 Red Hat <alan@redhat.com>
5 */
6
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>
22
23#include <linux/libata.h>
24#include <linux/ata.h>
25
26#define DRV_NAME "pata_acpi"
27#define DRV_VERSION "0.2.3"
28
29struct pata_acpi {
30 struct ata_acpi_gtm gtm;
31 void *last;
32 unsigned long mask[2];
33};
34
35/**
36 * pacpi_pre_reset - check for 40/80 pin
37 * @ap: Port
38 * @deadline: deadline jiffies for the operation
39 *
40 * Perform the PATA port setup we need.
41 */
42
43static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
44{
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;
49
Tejun Heo9363c382008-04-07 22:47:16 +090050 return ata_sff_prereset(link, deadline);
Alan Cox025621f2007-10-04 21:32:58 +010051}
52
53/**
54 * pacpi_cable_detect - cable type detection
55 * @ap: port to detect
56 *
57 * Perform device specific cable detection
58 */
59
60static int pacpi_cable_detect(struct ata_port *ap)
61{
62 struct pata_acpi *acpi = ap->private_data;
63
64 if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
65 return ATA_CBL_PATA80;
66 else
67 return ATA_CBL_PATA40;
68}
69
70/**
Alan Cox025621f2007-10-04 21:32:58 +010071 * pacpi_discover_modes - filter non ACPI modes
72 * @adev: ATA device
73 * @mask: proposed modes
74 *
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
77 */
78
79static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
80{
Alan Cox025621f2007-10-04 21:32:58 +010081 struct pata_acpi *acpi = ap->private_data;
Alan Cox025621f2007-10-04 21:32:58 +010082 struct ata_acpi_gtm probe;
Tejun Heo7c77fa42007-12-18 16:33:03 +090083 unsigned int xfer_mask;
Alan Cox025621f2007-10-04 21:32:58 +010084
85 probe = acpi->gtm;
86
Alan Cox025621f2007-10-04 21:32:58 +010087 ata_acpi_gtm(ap, &probe);
88
Tejun Heo7c77fa42007-12-18 16:33:03 +090089 xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
Alan Cox025621f2007-10-04 21:32:58 +010090
Tejun Heo7c77fa42007-12-18 16:33:03 +090091 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
Alan Cox025621f2007-10-04 21:32:58 +010092 ap->cbl = ATA_CBL_PATA80;
Tejun Heo7c77fa42007-12-18 16:33:03 +090093
94 return xfer_mask;
Alan Cox025621f2007-10-04 21:32:58 +010095}
96
97/**
98 * pacpi_mode_filter - mode filter for ACPI
99 * @adev: device
100 * @mask: mask of valid modes
101 *
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
104 */
105
106static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
107{
108 struct pata_acpi *acpi = adev->link->ap->private_data;
Tejun Heo9363c382008-04-07 22:47:16 +0900109 return ata_bmdma_mode_filter(adev, mask & acpi->mask[adev->devno]);
Alan Cox025621f2007-10-04 21:32:58 +0100110}
111
112/**
113 * pacpi_set_piomode - set initial PIO mode data
114 * @ap: ATA interface
115 * @adev: ATA device
116 */
117
118static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
119{
120 int unit = adev->devno;
121 struct pata_acpi *acpi = ap->private_data;
Tejun Heoa0f79b92007-12-18 16:33:05 +0900122 const struct ata_timing *t;
Alan Cox025621f2007-10-04 21:32:58 +0100123
Jeff Garzikb4479162007-10-25 20:47:30 -0400124 if (!(acpi->gtm.flags & 0x10))
Alan Cox025621f2007-10-04 21:32:58 +0100125 unit = 0;
126
127 /* Now stuff the nS values into the structure */
Tejun Heoa0f79b92007-12-18 16:33:05 +0900128 t = ata_timing_find_mode(adev->pio_mode);
129 acpi->gtm.drive[unit].pio = t->cycle;
Alan Cox025621f2007-10-04 21:32:58 +0100130 ata_acpi_stm(ap, &acpi->gtm);
131 /* See what mode we actually got */
132 ata_acpi_gtm(ap, &acpi->gtm);
133}
134
135/**
136 * pacpi_set_dmamode - set initial DMA mode data
137 * @ap: ATA interface
138 * @adev: ATA device
139 */
140
141static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
142{
143 int unit = adev->devno;
144 struct pata_acpi *acpi = ap->private_data;
Tejun Heoa0f79b92007-12-18 16:33:05 +0900145 const struct ata_timing *t;
Alan Cox025621f2007-10-04 21:32:58 +0100146
Jeff Garzikb4479162007-10-25 20:47:30 -0400147 if (!(acpi->gtm.flags & 0x10))
Alan Cox025621f2007-10-04 21:32:58 +0100148 unit = 0;
149
150 /* Now stuff the nS values into the structure */
Tejun Heoa0f79b92007-12-18 16:33:05 +0900151 t = ata_timing_find_mode(adev->dma_mode);
Alan Cox025621f2007-10-04 21:32:58 +0100152 if (adev->dma_mode >= XFER_UDMA_0) {
Tejun Heoa0f79b92007-12-18 16:33:05 +0900153 acpi->gtm.drive[unit].dma = t->udma;
Alan Cox025621f2007-10-04 21:32:58 +0100154 acpi->gtm.flags |= (1 << (2 * unit));
155 } else {
Tejun Heoa0f79b92007-12-18 16:33:05 +0900156 acpi->gtm.drive[unit].dma = t->cycle;
Alan Cox025621f2007-10-04 21:32:58 +0100157 acpi->gtm.flags &= ~(1 << (2 * unit));
158 }
159 ata_acpi_stm(ap, &acpi->gtm);
160 /* See what mode we actually got */
161 ata_acpi_gtm(ap, &acpi->gtm);
162}
163
164/**
Tejun Heo9363c382008-04-07 22:47:16 +0900165 * pacpi_qc_issue - command issue
Alan Cox025621f2007-10-04 21:32:58 +0100166 * @qc: command pending
167 *
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.
171 */
172
Tejun Heo9363c382008-04-07 22:47:16 +0900173static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
Alan Cox025621f2007-10-04 21:32:58 +0100174{
175 struct ata_port *ap = qc->ap;
176 struct ata_device *adev = qc->dev;
177 struct pata_acpi *acpi = ap->private_data;
178
179 if (acpi->gtm.flags & 0x10)
Tejun Heo9363c382008-04-07 22:47:16 +0900180 return ata_sff_qc_issue(qc);
Alan Cox025621f2007-10-04 21:32:58 +0100181
182 if (adev != acpi->last) {
183 pacpi_set_piomode(ap, adev);
Alan Coxb15b3eb2008-08-01 09:18:34 +0100184 if (ata_dma_enabled(adev))
Alan Cox025621f2007-10-04 21:32:58 +0100185 pacpi_set_dmamode(ap, adev);
186 acpi->last = adev;
187 }
Tejun Heo9363c382008-04-07 22:47:16 +0900188 return ata_sff_qc_issue(qc);
Alan Cox025621f2007-10-04 21:32:58 +0100189}
190
191/**
192 * pacpi_port_start - port setup
193 * @ap: ATA port being set up
194 *
195 * Use the port_start hook to maintain private control structures
196 */
197
198static int pacpi_port_start(struct ata_port *ap)
199{
200 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
201 struct pata_acpi *acpi;
202
203 int ret;
204
205 if (ap->acpi_handle == NULL)
206 return -ENODEV;
207
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;
216
217 return ret;
218}
219
220static struct scsi_host_template pacpi_sht = {
Tejun Heo68d1d072008-03-25 12:22:49 +0900221 ATA_BMDMA_SHT(DRV_NAME),
Alan Cox025621f2007-10-04 21:32:58 +0100222};
223
Tejun Heo029cfd62008-03-25 12:22:49 +0900224static struct ata_port_operations pacpi_ops = {
225 .inherits = &ata_bmdma_port_ops,
Tejun Heo9363c382008-04-07 22:47:16 +0900226 .qc_issue = pacpi_qc_issue,
Tejun Heo029cfd62008-03-25 12:22:49 +0900227 .cable_detect = pacpi_cable_detect,
228 .mode_filter = pacpi_mode_filter,
Alan Cox025621f2007-10-04 21:32:58 +0100229 .set_piomode = pacpi_set_piomode,
230 .set_dmamode = pacpi_set_dmamode,
Tejun Heo887125e2008-03-25 12:22:49 +0900231 .prereset = pacpi_pre_reset,
Alan Cox025621f2007-10-04 21:32:58 +0100232 .port_start = pacpi_port_start,
233};
234
235
236/**
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
240 *
241 * Called from kernel PCI layer.
242 *
243 * LOCKING:
244 * Inherited from PCI layer (may sleep).
245 *
246 * RETURNS:
247 * Zero on success, or -ERRNO value.
248 */
249
250static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
251{
252 static const struct ata_port_info info = {
Alan Cox025621f2007-10-04 21:32:58 +0100253 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
254
255 .pio_mask = 0x1f,
256 .mwdma_mask = 0x07,
257 .udma_mask = 0x7f,
258
259 .port_ops = &pacpi_ops,
260 };
261 const struct ata_port_info *ppi[] = { &info, NULL };
Alan Cox05177f12008-05-02 15:13:39 -0700262 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);
267 }
Tejun Heo9363c382008-04-07 22:47:16 +0900268 return ata_pci_sff_init_one(pdev, ppi, &pacpi_sht, NULL);
Alan Cox025621f2007-10-04 21:32:58 +0100269}
270
271static 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 */
274};
275
276static 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,
Tejun Heo8e2840e2007-10-17 15:24:16 +0900281#ifdef CONFIG_PM
Alan Cox025621f2007-10-04 21:32:58 +0100282 .suspend = ata_pci_device_suspend,
283 .resume = ata_pci_device_resume,
Tejun Heo8e2840e2007-10-17 15:24:16 +0900284#endif
Alan Cox025621f2007-10-04 21:32:58 +0100285};
286
287static int __init pacpi_init(void)
288{
289 return pci_register_driver(&pacpi_pci_driver);
290}
291
292static void __exit pacpi_exit(void)
293{
294 pci_unregister_driver(&pacpi_pci_driver);
295}
296
297module_init(pacpi_init);
298module_exit(pacpi_exit);
299
300MODULE_AUTHOR("Alan Cox");
301MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
302MODULE_LICENSE("GPL");
303MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
304MODULE_VERSION(DRV_VERSION);
305