aboutsummaryrefslogtreecommitdiff
path: root/drivers/ata/pata_acpi.c
blob: 066b9f301ed5a76e7de363ec083dc7cf0686a36b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
/*
 *	ACPI PATA driver
 *
 *	(c) 2007 Red Hat
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gfp.h>
#include <scsi/scsi_host.h>
#include <acpi/acpi_bus.h>

#include <linux/libata.h>
#include <linux/ata.h>

#define DRV_NAME	"pata_acpi"
#define DRV_VERSION	"0.2.3"

struct pata_acpi {
	struct ata_acpi_gtm gtm;
	void *last;
	unsigned long mask[2];
};

/**
 *	pacpi_pre_reset	-	check for 40/80 pin
 *	@ap: Port
 *	@deadline: deadline jiffies for the operation
 *
 *	Perform the PATA port setup we need.
 */

static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
{
	struct ata_port *ap = link->ap;
	struct pata_acpi *acpi = ap->private_data;
	if (ap->acpi_handle == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0)
		return -ENODEV;

	return ata_sff_prereset(link, deadline);
}

/**
 *	pacpi_cable_detect	-	cable type detection
 *	@ap: port to detect
 *
 *	Perform device specific cable detection
 */

static int pacpi_cable_detect(struct ata_port *ap)
{
	struct pata_acpi *acpi = ap->private_data;

	if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
		return ATA_CBL_PATA80;
	else
		return ATA_CBL_PATA40;
}

/**
 *	pacpi_discover_modes	-	filter non ACPI modes
 *	@adev: ATA device
 *	@mask: proposed modes
 *
 *	Try the modes available and see which ones the ACPI method will
 *	set up sensibly. From this we get a mask of ACPI modes we can use
 */

static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
{
	struct pata_acpi *acpi = ap->private_data;
	struct ata_acpi_gtm probe;
	unsigned int xfer_mask;

	probe = acpi->gtm;

	ata_acpi_gtm(ap, &probe);

	xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);

	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
		ap->cbl = ATA_CBL_PATA80;

	return xfer_mask;
}

/**
 *	pacpi_mode_filter	-	mode filter for ACPI
 *	@adev: device
 *	@mask: mask of valid modes
 *
 *	Filter the valid mode list according to our own specific rules, in
 *	this case the list of discovered valid modes obtained by ACPI probing
 */

static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
{
	struct pata_acpi *acpi = adev->link->ap->private_data;
	return mask & acpi->mask[adev->devno];
}

/**
 *	pacpi_set_piomode	-	set initial PIO mode data
 *	@ap: ATA interface
 *	@adev: ATA device
 */

static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	int unit = adev->devno;
	struct pata_acpi *acpi = ap->private_data;
	const struct ata_timing *t;

	if (!(acpi->gtm.flags & 0x10))
		unit = 0;

	/* Now stuff the nS values into the structure */
	t = ata_timing_find_mode(adev->pio_mode);
	acpi->gtm.drive[unit].pio = t->cycle;
	ata_acpi_stm(ap, &acpi->gtm);
	/* See what mode we actually got */
	ata_acpi_gtm(ap, &acpi->gtm);
}

/**
 *	pacpi_set_dmamode	-	set initial DMA mode data
 *	@ap: ATA interface
 *	@adev: ATA device
 */

static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
	int unit = adev->devno;
	struct pata_acpi *acpi = ap->private_data;
	const struct ata_timing *t;

	if (!(acpi->gtm.flags & 0x10))
		unit = 0;

	/* Now stuff the nS values into the structure */
	t = ata_timing_find_mode(adev->dma_mode);
	if (adev->dma_mode >= XFER_UDMA_0) {
		acpi->gtm.drive[unit].dma = t->udma;
		acpi->gtm.flags |= (1 << (2 * unit));
	} else {
		acpi->gtm.drive[unit].dma = t->cycle;
		acpi->gtm.flags &= ~(1 << (2 * unit));
	}
	ata_acpi_stm(ap, &acpi->gtm);
	/* See what mode we actually got */
	ata_acpi_gtm(ap, &acpi->gtm);
}

/**
 *	pacpi_qc_issue	-	command issue
 *	@qc: command pending
 *
 *	Called when the libata layer is about to issue a command. We wrap
 *	this interface so that we can load the correct ATA timings if
 *	necessary.
 */

static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct ata_device *adev = qc->dev;
	struct pata_acpi *acpi = ap->private_data;

	if (acpi->gtm.flags & 0x10)
		return ata_bmdma_qc_issue(qc);

	if (adev != acpi->last) {
		pacpi_set_piomode(ap, adev);
		if (ata_dma_enabled(adev))
			pacpi_set_dmamode(ap, adev);
		acpi->last = adev;
	}
	return ata_bmdma_qc_issue(qc);
}

/**
 *	pacpi_port_start	-	port setup
 *	@ap: ATA port being set up
 *
 *	Use the port_start hook to maintain private control structures
 */

static int pacpi_port_start(struct ata_port *ap)
{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	struct pata_acpi *acpi;

	int ret;

	if (ap->acpi_handle == NULL)
		return -ENODEV;

	acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
	if (ap->private_data == NULL)
		return -ENOMEM;
	acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
	acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
	ret = ata_bmdma_port_start(ap);
	if (ret < 0)
		return ret;

	return ret;
}

static struct scsi_host_template pacpi_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
};

static struct ata_port_operations pacpi_ops = {
	.inherits		= &ata_bmdma_port_ops,
	.qc_issue		= pacpi_qc_issue,
	.cable_detect		= pacpi_cable_detect,
	.mode_filter		= pacpi_mode_filter,
	.set_piomode		= pacpi_set_piomode,
	.set_dmamode		= pacpi_set_dmamode,
	.prereset		= pacpi_pre_reset,
	.port_start		= pacpi_port_start,
};


/**
 *	pacpi_init_one - Register ACPI ATA PCI device with kernel services
 *	@pdev: PCI device to register
 *	@ent: Entry in pacpi_pci_tbl matching with @pdev
 *
 *	Called from kernel PCI layer.
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 *
 *	RETURNS:
 *	Zero on success, or -ERRNO value.
 */

static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
{
	static const struct ata_port_info info = {
		.flags		= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,

		.pio_mask	= ATA_PIO4,
		.mwdma_mask	= ATA_MWDMA2,
		.udma_mask 	= ATA_UDMA6,

		.port_ops	= &pacpi_ops,
	};
	const struct ata_port_info *ppi[] = { &info, NULL };
	if (pdev->vendor == PCI_VENDOR_ID_ATI) {
		int rc = pcim_enable_device(pdev);
		if (rc < 0)
			return rc;
		pcim_pin_device(pdev);
	}
	return ata_pci_sff_init_one(pdev, ppi, &pacpi_sht, NULL, 0);
}

static const struct pci_device_id pacpi_pci_tbl[] = {
	{ PCI_ANY_ID,		PCI_ANY_ID,			   PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
	{ }	/* terminate list */
};

static struct pci_driver pacpi_pci_driver = {
	.name			= DRV_NAME,
	.id_table		= pacpi_pci_tbl,
	.probe			= pacpi_init_one,
	.remove			= ata_pci_remove_one,
#ifdef CONFIG_PM
	.suspend		= ata_pci_device_suspend,
	.resume			= ata_pci_device_resume,
#endif
};

static int __init pacpi_init(void)
{
	return pci_register_driver(&pacpi_pci_driver);
}

static void __exit pacpi_exit(void)
{
	pci_unregister_driver(&pacpi_pci_driver);
}

module_init(pacpi_init);
module_exit(pacpi_exit);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
MODULE_VERSION(DRV_VERSION);