pata_acpi.c revision 5a0e3ad6af8660be21ca98a971cd00f331318c05 
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/init.h>
11#include <linux/blkdev.h>
12#include <linux/delay.h>
13#include <linux/device.h>
14#include <linux/gfp.h>
15#include <scsi/scsi_host.h>
16#include <acpi/acpi_bus.h>
17
18#include <linux/libata.h>
19#include <linux/ata.h>
20
21#define DRV_NAME	"pata_acpi"
22#define DRV_VERSION	"0.2.3"
23
24struct pata_acpi {
25	struct ata_acpi_gtm gtm;
26	void *last;
27	unsigned long mask[2];
28};
29
30/**
31 *	pacpi_pre_reset	-	check for 40/80 pin
32 *	@ap: Port
33 *	@deadline: deadline jiffies for the operation
34 *
35 *	Perform the PATA port setup we need.
36 */
37
38static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
39{
40	struct ata_port *ap = link->ap;
41	struct pata_acpi *acpi = ap->private_data;
42	if (ap->acpi_handle == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0)
43		return -ENODEV;
44
45	return ata_sff_prereset(link, deadline);
46}
47
48/**
49 *	pacpi_cable_detect	-	cable type detection
50 *	@ap: port to detect
51 *
52 *	Perform device specific cable detection
53 */
54
55static int pacpi_cable_detect(struct ata_port *ap)
56{
57	struct pata_acpi *acpi = ap->private_data;
58
59	if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
60		return ATA_CBL_PATA80;
61	else
62		return ATA_CBL_PATA40;
63}
64
65/**
66 *	pacpi_discover_modes	-	filter non ACPI modes
67 *	@adev: ATA device
68 *	@mask: proposed modes
69 *
70 *	Try the modes available and see which ones the ACPI method will
71 *	set up sensibly. From this we get a mask of ACPI modes we can use
72 */
73
74static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
75{
76	struct pata_acpi *acpi = ap->private_data;
77	struct ata_acpi_gtm probe;
78	unsigned int xfer_mask;
79
80	probe = acpi->gtm;
81
82	ata_acpi_gtm(ap, &probe);
83
84	xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
85
86	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
87		ap->cbl = ATA_CBL_PATA80;
88
89	return xfer_mask;
90}
91
92/**
93 *	pacpi_mode_filter	-	mode filter for ACPI
94 *	@adev: device
95 *	@mask: mask of valid modes
96 *
97 *	Filter the valid mode list according to our own specific rules, in
98 *	this case the list of discovered valid modes obtained by ACPI probing
99 */
100
101static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
102{
103	struct pata_acpi *acpi = adev->link->ap->private_data;
104	return ata_bmdma_mode_filter(adev, mask & acpi->mask[adev->devno]);
105}
106
107/**
108 *	pacpi_set_piomode	-	set initial PIO mode data
109 *	@ap: ATA interface
110 *	@adev: ATA device
111 */
112
113static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
114{
115	int unit = adev->devno;
116	struct pata_acpi *acpi = ap->private_data;
117	const struct ata_timing *t;
118
119	if (!(acpi->gtm.flags & 0x10))
120		unit = 0;
121
122	/* Now stuff the nS values into the structure */
123	t = ata_timing_find_mode(adev->pio_mode);
124	acpi->gtm.drive[unit].pio = t->cycle;
125	ata_acpi_stm(ap, &acpi->gtm);
126	/* See what mode we actually got */
127	ata_acpi_gtm(ap, &acpi->gtm);
128}
129
130/**
131 *	pacpi_set_dmamode	-	set initial DMA mode data
132 *	@ap: ATA interface
133 *	@adev: ATA device
134 */
135
136static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
137{
138	int unit = adev->devno;
139	struct pata_acpi *acpi = ap->private_data;
140	const struct ata_timing *t;
141
142	if (!(acpi->gtm.flags & 0x10))
143		unit = 0;
144
145	/* Now stuff the nS values into the structure */
146	t = ata_timing_find_mode(adev->dma_mode);
147	if (adev->dma_mode >= XFER_UDMA_0) {
148		acpi->gtm.drive[unit].dma = t->udma;
149		acpi->gtm.flags |= (1 << (2 * unit));
150	} else {
151		acpi->gtm.drive[unit].dma = t->cycle;
152		acpi->gtm.flags &= ~(1 << (2 * unit));
153	}
154	ata_acpi_stm(ap, &acpi->gtm);
155	/* See what mode we actually got */
156	ata_acpi_gtm(ap, &acpi->gtm);
157}
158
159/**
160 *	pacpi_qc_issue	-	command issue
161 *	@qc: command pending
162 *
163 *	Called when the libata layer is about to issue a command. We wrap
164 *	this interface so that we can load the correct ATA timings if
165 *	necessary.
166 */
167
168static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
169{
170	struct ata_port *ap = qc->ap;
171	struct ata_device *adev = qc->dev;
172	struct pata_acpi *acpi = ap->private_data;
173
174	if (acpi->gtm.flags & 0x10)
175		return ata_sff_qc_issue(qc);
176
177	if (adev != acpi->last) {
178		pacpi_set_piomode(ap, adev);
179		if (ata_dma_enabled(adev))
180			pacpi_set_dmamode(ap, adev);
181		acpi->last = adev;
182	}
183	return ata_sff_qc_issue(qc);
184}
185
186/**
187 *	pacpi_port_start	-	port setup
188 *	@ap: ATA port being set up
189 *
190 *	Use the port_start hook to maintain private control structures
191 */
192
193static int pacpi_port_start(struct ata_port *ap)
194{
195	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
196	struct pata_acpi *acpi;
197
198	int ret;
199
200	if (ap->acpi_handle == NULL)
201		return -ENODEV;
202
203	acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
204	if (ap->private_data == NULL)
205		return -ENOMEM;
206	acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
207	acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
208	ret = ata_sff_port_start(ap);
209	if (ret < 0)
210		return ret;
211
212	return ret;
213}
214
215static struct scsi_host_template pacpi_sht = {
216	ATA_BMDMA_SHT(DRV_NAME),
217};
218
219static struct ata_port_operations pacpi_ops = {
220	.inherits		= &ata_bmdma_port_ops,
221	.qc_issue		= pacpi_qc_issue,
222	.cable_detect		= pacpi_cable_detect,
223	.mode_filter		= pacpi_mode_filter,
224	.set_piomode		= pacpi_set_piomode,
225	.set_dmamode		= pacpi_set_dmamode,
226	.prereset		= pacpi_pre_reset,
227	.port_start		= pacpi_port_start,
228};
229
230
231/**
232 *	pacpi_init_one - Register ACPI ATA PCI device with kernel services
233 *	@pdev: PCI device to register
234 *	@ent: Entry in pacpi_pci_tbl matching with @pdev
235 *
236 *	Called from kernel PCI layer.
237 *
238 *	LOCKING:
239 *	Inherited from PCI layer (may sleep).
240 *
241 *	RETURNS:
242 *	Zero on success, or -ERRNO value.
243 */
244
245static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
246{
247	static const struct ata_port_info info = {
248		.flags		= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
249
250		.pio_mask	= ATA_PIO4,
251		.mwdma_mask	= ATA_MWDMA2,
252		.udma_mask 	= ATA_UDMA6,
253
254		.port_ops	= &pacpi_ops,
255	};
256	const struct ata_port_info *ppi[] = { &info, NULL };
257	if (pdev->vendor == PCI_VENDOR_ID_ATI) {
258		int rc = pcim_enable_device(pdev);
259		if (rc < 0)
260			return rc;
261		pcim_pin_device(pdev);
262	}
263	return ata_pci_sff_init_one(pdev, ppi, &pacpi_sht, NULL, 0);
264}
265
266static const struct pci_device_id pacpi_pci_tbl[] = {
267	{ PCI_ANY_ID,		PCI_ANY_ID,			   PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
268	{ }	/* terminate list */
269};
270
271static struct pci_driver pacpi_pci_driver = {
272	.name			= DRV_NAME,
273	.id_table		= pacpi_pci_tbl,
274	.probe			= pacpi_init_one,
275	.remove			= ata_pci_remove_one,
276#ifdef CONFIG_PM
277	.suspend		= ata_pci_device_suspend,
278	.resume			= ata_pci_device_resume,
279#endif
280};
281
282static int __init pacpi_init(void)
283{
284	return pci_register_driver(&pacpi_pci_driver);
285}
286
287static void __exit pacpi_exit(void)
288{
289	pci_unregister_driver(&pacpi_pci_driver);
290}
291
292module_init(pacpi_init);
293module_exit(pacpi_exit);
294
295MODULE_AUTHOR("Alan Cox");
296MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
297MODULE_LICENSE("GPL");
298MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
299MODULE_VERSION(DRV_VERSION);
300
301