pata_acpi.c revision 9363c3825ea9ad76561eb48a395349dd29211ed6 
1/*
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
50	return ata_sff_prereset(link, deadline);
51}
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/**
71 *	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{
81	struct pata_acpi *acpi = ap->private_data;
82	struct ata_acpi_gtm probe;
83	unsigned int xfer_mask;
84
85	probe = acpi->gtm;
86
87	ata_acpi_gtm(ap, &probe);
88
89	xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
90
91	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
92		ap->cbl = ATA_CBL_PATA80;
93
94	return xfer_mask;
95}
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;
109	return ata_bmdma_mode_filter(adev, mask & acpi->mask[adev->devno]);
110}
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;
122	const struct ata_timing *t;
123
124	if (!(acpi->gtm.flags & 0x10))
125		unit = 0;
126
127	/* Now stuff the nS values into the structure */
128	t = ata_timing_find_mode(adev->pio_mode);
129	acpi->gtm.drive[unit].pio = t->cycle;
130	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;
145	const struct ata_timing *t;
146
147	if (!(acpi->gtm.flags & 0x10))
148		unit = 0;
149
150	/* Now stuff the nS values into the structure */
151	t = ata_timing_find_mode(adev->dma_mode);
152	if (adev->dma_mode >= XFER_UDMA_0) {
153		acpi->gtm.drive[unit].dma = t->udma;
154		acpi->gtm.flags |= (1 << (2 * unit));
155	} else {
156		acpi->gtm.drive[unit].dma = t->cycle;
157		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/**
165 *	pacpi_qc_issue	-	command issue
166 *	@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
173static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
174{
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)
180		return ata_sff_qc_issue(qc);
181
182	if (adev != acpi->last) {
183		pacpi_set_piomode(ap, adev);
184		if (adev->dma_mode)
185			pacpi_set_dmamode(ap, adev);
186		acpi->last = adev;
187	}
188	return ata_sff_qc_issue(qc);
189}
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 = {
221	ATA_BMDMA_SHT(DRV_NAME),
222};
223
224static struct ata_port_operations pacpi_ops = {
225	.inherits		= &ata_bmdma_port_ops,
226	.qc_issue		= pacpi_qc_issue,
227	.cable_detect		= pacpi_cable_detect,
228	.mode_filter		= pacpi_mode_filter,
229	.set_piomode		= pacpi_set_piomode,
230	.set_dmamode		= pacpi_set_dmamode,
231	.prereset		= pacpi_pre_reset,
232	.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 = {
253		.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 };
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	{ }	/* 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,
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);
299
300