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Alan Cox025621f2007-10-04 21:32:58 +01001/*
2 * ACPI PATA driver
3 *
Alan Coxab771632008-10-27 15:09:10 +00004 * (c) 2007 Red Hat
Alan Cox025621f2007-10-04 21:32:58 +01005 */
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>
Alan Cox025621f2007-10-04 21:32:58 +010016
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};
28
29/**
30 * pacpi_pre_reset - check for 40/80 pin
31 * @ap: Port
32 * @deadline: deadline jiffies for the operation
33 *
34 * Perform the PATA port setup we need.
35 */
36
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
Tejun Heo9363c382008-04-07 22:47:16 +090044 return ata_sff_prereset(link, deadline);
Alan Cox025621f2007-10-04 21:32:58 +010045}
46
47/**
48 * pacpi_cable_detect - cable type detection
49 * @ap: port to detect
50 *
51 * Perform device specific cable detection
52 */
53
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}
63
64/**
Alan Cox025621f2007-10-04 21:32:58 +010065 * pacpi_discover_modes - filter non ACPI modes
66 * @adev: ATA device
67 * @mask: proposed modes
68 *
69 * Try the modes available and see which ones the ACPI method will
70 * set up sensibly. From this we get a mask of ACPI modes we can use
71 */
72
73static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
74{
Alan Cox025621f2007-10-04 21:32:58 +010075 struct pata_acpi *acpi = ap->private_data;
Alan Cox025621f2007-10-04 21:32:58 +010076 struct ata_acpi_gtm probe;
Tejun Heo7c77fa42007-12-18 16:33:03 +090077 unsigned int xfer_mask;
Alan Cox025621f2007-10-04 21:32:58 +010078
79 probe = acpi->gtm;
80
Alan Cox025621f2007-10-04 21:32:58 +010081 ata_acpi_gtm(ap, &probe);
82
Tejun Heo7c77fa42007-12-18 16:33:03 +090083 xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
Alan Cox025621f2007-10-04 21:32:58 +010084
Tejun Heo7c77fa42007-12-18 16:33:03 +090085 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
Alan Cox025621f2007-10-04 21:32:58 +010086 ap->cbl = ATA_CBL_PATA80;
Tejun Heo7c77fa42007-12-18 16:33:03 +090087
88 return xfer_mask;
Alan Cox025621f2007-10-04 21:32:58 +010089}
90
91/**
92 * pacpi_mode_filter - mode filter for ACPI
93 * @adev: device
94 * @mask: mask of valid modes
95 *
96 * Filter the valid mode list according to our own specific rules, in
97 * this case the list of discovered valid modes obtained by ACPI probing
98 */
99
100static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
101{
102 struct pata_acpi *acpi = adev->link->ap->private_data;
Tejun Heo9363c382008-04-07 22:47:16 +0900103 return ata_bmdma_mode_filter(adev, mask & acpi->mask[adev->devno]);
Alan Cox025621f2007-10-04 21:32:58 +0100104}
105
106/**
107 * pacpi_set_piomode - set initial PIO mode data
108 * @ap: ATA interface
109 * @adev: ATA device
110 */
111
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;
Tejun Heoa0f79b92007-12-18 16:33:05 +0900116 const struct ata_timing *t;
Alan Cox025621f2007-10-04 21:32:58 +0100117
Jeff Garzikb4479162007-10-25 20:47:30 -0400118 if (!(acpi->gtm.flags & 0x10))
Alan Cox025621f2007-10-04 21:32:58 +0100119 unit = 0;
120
121 /* Now stuff the nS values into the structure */
Tejun Heoa0f79b92007-12-18 16:33:05 +0900122 t = ata_timing_find_mode(adev->pio_mode);
123 acpi->gtm.drive[unit].pio = t->cycle;
Alan Cox025621f2007-10-04 21:32:58 +0100124 ata_acpi_stm(ap, &acpi->gtm);
125 /* See what mode we actually got */
126 ata_acpi_gtm(ap, &acpi->gtm);
127}
128
129/**
130 * pacpi_set_dmamode - set initial DMA mode data
131 * @ap: ATA interface
132 * @adev: ATA device
133 */
134
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;
Tejun Heoa0f79b92007-12-18 16:33:05 +0900139 const struct ata_timing *t;
Alan Cox025621f2007-10-04 21:32:58 +0100140
Jeff Garzikb4479162007-10-25 20:47:30 -0400141 if (!(acpi->gtm.flags & 0x10))
Alan Cox025621f2007-10-04 21:32:58 +0100142 unit = 0;
143
144 /* Now stuff the nS values into the structure */
Tejun Heoa0f79b92007-12-18 16:33:05 +0900145 t = ata_timing_find_mode(adev->dma_mode);
Alan Cox025621f2007-10-04 21:32:58 +0100146 if (adev->dma_mode >= XFER_UDMA_0) {
Tejun Heoa0f79b92007-12-18 16:33:05 +0900147 acpi->gtm.drive[unit].dma = t->udma;
Alan Cox025621f2007-10-04 21:32:58 +0100148 acpi->gtm.flags |= (1 << (2 * unit));
149 } else {
Tejun Heoa0f79b92007-12-18 16:33:05 +0900150 acpi->gtm.drive[unit].dma = t->cycle;
Alan Cox025621f2007-10-04 21:32:58 +0100151 acpi->gtm.flags &= ~(1 << (2 * unit));
152 }
153 ata_acpi_stm(ap, &acpi->gtm);
154 /* See what mode we actually got */
155 ata_acpi_gtm(ap, &acpi->gtm);
156}
157
158/**
Tejun Heo9363c382008-04-07 22:47:16 +0900159 * pacpi_qc_issue - command issue
Alan Cox025621f2007-10-04 21:32:58 +0100160 * @qc: command pending
161 *
162 * Called when the libata layer is about to issue a command. We wrap
163 * this interface so that we can load the correct ATA timings if
164 * neccessary.
165 */
166
Tejun Heo9363c382008-04-07 22:47:16 +0900167static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
Alan Cox025621f2007-10-04 21:32:58 +0100168{
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)
Tejun Heo9363c382008-04-07 22:47:16 +0900174 return ata_sff_qc_issue(qc);
Alan Cox025621f2007-10-04 21:32:58 +0100175
176 if (adev != acpi->last) {
177 pacpi_set_piomode(ap, adev);
Alan Coxb15b3eb2008-08-01 09:18:34 +0100178 if (ata_dma_enabled(adev))
Alan Cox025621f2007-10-04 21:32:58 +0100179 pacpi_set_dmamode(ap, adev);
180 acpi->last = adev;
181 }
Tejun Heo9363c382008-04-07 22:47:16 +0900182 return ata_sff_qc_issue(qc);
Alan Cox025621f2007-10-04 21:32:58 +0100183}
184
185/**
186 * pacpi_port_start - port setup
187 * @ap: ATA port being set up
188 *
189 * Use the port_start hook to maintain private control structures
190 */
191
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 = {
Tejun Heo68d1d072008-03-25 12:22:49 +0900215 ATA_BMDMA_SHT(DRV_NAME),
Alan Cox025621f2007-10-04 21:32:58 +0100216};
217
Tejun Heo029cfd62008-03-25 12:22:49 +0900218static struct ata_port_operations pacpi_ops = {
219 .inherits = &ata_bmdma_port_ops,
Tejun Heo9363c382008-04-07 22:47:16 +0900220 .qc_issue = pacpi_qc_issue,
Tejun Heo029cfd62008-03-25 12:22:49 +0900221 .cable_detect = pacpi_cable_detect,
222 .mode_filter = pacpi_mode_filter,
Alan Cox025621f2007-10-04 21:32:58 +0100223 .set_piomode = pacpi_set_piomode,
224 .set_dmamode = pacpi_set_dmamode,
Tejun Heo887125e2008-03-25 12:22:49 +0900225 .prereset = pacpi_pre_reset,
Alan Cox025621f2007-10-04 21:32:58 +0100226 .port_start = pacpi_port_start,
227};
228
229
230/**
231 * pacpi_init_one - Register ACPI ATA PCI device with kernel services
232 * @pdev: PCI device to register
233 * @ent: Entry in pacpi_pci_tbl matching with @pdev
234 *
235 * Called from kernel PCI layer.
236 *
237 * LOCKING:
238 * Inherited from PCI layer (may sleep).
239 *
240 * RETURNS:
241 * Zero on success, or -ERRNO value.
242 */
243
244static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
245{
246 static const struct ata_port_info info = {
Alan Cox025621f2007-10-04 21:32:58 +0100247 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
248
Erik Inge Bolsø14bdef92009-03-14 21:38:24 +0100249 .pio_mask = ATA_PIO4,
250 .mwdma_mask = ATA_MWDMA2,
251 .udma_mask = ATA_UDMA6,
Alan Cox025621f2007-10-04 21:32:58 +0100252
253 .port_ops = &pacpi_ops,
254 };
255 const struct ata_port_info *ppi[] = { &info, NULL };
Alan Cox05177f12008-05-02 15:13:39 -0700256 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 }
Tejun Heo9363c382008-04-07 22:47:16 +0900262 return ata_pci_sff_init_one(pdev, ppi, &pacpi_sht, NULL);
Alan Cox025621f2007-10-04 21:32:58 +0100263}
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 { } /* terminate list */
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,
Tejun Heo8e2840e2007-10-17 15:24:16 +0900275#ifdef CONFIG_PM
Alan Cox025621f2007-10-04 21:32:58 +0100276 .suspend = ata_pci_device_suspend,
277 .resume = ata_pci_device_resume,
Tejun Heo8e2840e2007-10-17 15:24:16 +0900278#endif
Alan Cox025621f2007-10-04 21:32:58 +0100279};
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);
299