pata_acpi.c revision 7c77fa4d51b1480bcec2e898c94d6912fe063c16 
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_std_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_error_handler - Setup and error handler
72 *	@ap: Port to handle
73 *
74 *	LOCKING:
75 *	None (inherited from caller).
76 */
77
78static void pacpi_error_handler(struct ata_port *ap)
79{
80	return ata_bmdma_drive_eh(ap, pacpi_pre_reset, ata_std_softreset,
81				  NULL, ata_std_postreset);
82}
83
84/**
85 *	pacpi_discover_modes	-	filter non ACPI modes
86 *	@adev: ATA device
87 *	@mask: proposed modes
88 *
89 *	Try the modes available and see which ones the ACPI method will
90 *	set up sensibly. From this we get a mask of ACPI modes we can use
91 */
92
93static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
94{
95	struct pata_acpi *acpi = ap->private_data;
96	struct ata_acpi_gtm probe;
97	unsigned int xfer_mask;
98
99	probe = acpi->gtm;
100
101	ata_acpi_gtm(ap, &probe);
102
103	xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
104
105	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
106		ap->cbl = ATA_CBL_PATA80;
107
108	return xfer_mask;
109}
110
111/**
112 *	pacpi_mode_filter	-	mode filter for ACPI
113 *	@adev: device
114 *	@mask: mask of valid modes
115 *
116 *	Filter the valid mode list according to our own specific rules, in
117 *	this case the list of discovered valid modes obtained by ACPI probing
118 */
119
120static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
121{
122	struct pata_acpi *acpi = adev->link->ap->private_data;
123	return ata_pci_default_filter(adev, mask & acpi->mask[adev->devno]);
124}
125
126/**
127 *	pacpi_set_piomode	-	set initial PIO mode data
128 *	@ap: ATA interface
129 *	@adev: ATA device
130 */
131
132static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
133{
134	int unit = adev->devno;
135	struct pata_acpi *acpi = ap->private_data;
136
137	if (!(acpi->gtm.flags & 0x10))
138		unit = 0;
139
140	/* Now stuff the nS values into the structure */
141	acpi->gtm.drive[unit].pio =
142		ata_acpi_pio_cycle[adev->pio_mode - XFER_PIO_0];
143	ata_acpi_stm(ap, &acpi->gtm);
144	/* See what mode we actually got */
145	ata_acpi_gtm(ap, &acpi->gtm);
146}
147
148/**
149 *	pacpi_set_dmamode	-	set initial DMA mode data
150 *	@ap: ATA interface
151 *	@adev: ATA device
152 */
153
154static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
155{
156	int unit = adev->devno;
157	struct pata_acpi *acpi = ap->private_data;
158
159	if (!(acpi->gtm.flags & 0x10))
160		unit = 0;
161
162	/* Now stuff the nS values into the structure */
163	if (adev->dma_mode >= XFER_UDMA_0) {
164		acpi->gtm.drive[unit].dma =
165			ata_acpi_udma_cycle[adev->dma_mode - XFER_UDMA_0];
166		acpi->gtm.flags |= (1 << (2 * unit));
167	} else {
168		acpi->gtm.drive[unit].dma =
169			ata_acpi_mwdma_cycle[adev->dma_mode - XFER_MW_DMA_0];
170		acpi->gtm.flags &= ~(1 << (2 * unit));
171	}
172	ata_acpi_stm(ap, &acpi->gtm);
173	/* See what mode we actually got */
174	ata_acpi_gtm(ap, &acpi->gtm);
175}
176
177/**
178 *	pacpi_qc_issue_prot	-	command issue
179 *	@qc: command pending
180 *
181 *	Called when the libata layer is about to issue a command. We wrap
182 *	this interface so that we can load the correct ATA timings if
183 *	neccessary.
184 */
185
186static unsigned int pacpi_qc_issue_prot(struct ata_queued_cmd *qc)
187{
188	struct ata_port *ap = qc->ap;
189	struct ata_device *adev = qc->dev;
190	struct pata_acpi *acpi = ap->private_data;
191
192	if (acpi->gtm.flags & 0x10)
193		return ata_qc_issue_prot(qc);
194
195	if (adev != acpi->last) {
196		pacpi_set_piomode(ap, adev);
197		if (adev->dma_mode)
198			pacpi_set_dmamode(ap, adev);
199		acpi->last = adev;
200	}
201	return ata_qc_issue_prot(qc);
202}
203
204/**
205 *	pacpi_port_start	-	port setup
206 *	@ap: ATA port being set up
207 *
208 *	Use the port_start hook to maintain private control structures
209 */
210
211static int pacpi_port_start(struct ata_port *ap)
212{
213	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
214	struct pata_acpi *acpi;
215
216	int ret;
217
218	if (ap->acpi_handle == NULL)
219		return -ENODEV;
220
221	acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
222	if (ap->private_data == NULL)
223		return -ENOMEM;
224	acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
225	acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
226	ret = ata_sff_port_start(ap);
227	if (ret < 0)
228		return ret;
229
230	return ret;
231}
232
233static struct scsi_host_template pacpi_sht = {
234	.module			= THIS_MODULE,
235	.name			= DRV_NAME,
236	.ioctl			= ata_scsi_ioctl,
237	.queuecommand		= ata_scsi_queuecmd,
238	.can_queue		= ATA_DEF_QUEUE,
239	.this_id		= ATA_SHT_THIS_ID,
240	.sg_tablesize		= LIBATA_MAX_PRD,
241	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
242	.emulated		= ATA_SHT_EMULATED,
243	.use_clustering		= ATA_SHT_USE_CLUSTERING,
244	.proc_name		= DRV_NAME,
245	.dma_boundary		= ATA_DMA_BOUNDARY,
246	.slave_configure	= ata_scsi_slave_config,
247	.slave_destroy		= ata_scsi_slave_destroy,
248	/* Use standard CHS mapping rules */
249	.bios_param		= ata_std_bios_param,
250};
251
252static const struct ata_port_operations pacpi_ops = {
253	.set_piomode		= pacpi_set_piomode,
254	.set_dmamode		= pacpi_set_dmamode,
255	.mode_filter		= pacpi_mode_filter,
256
257	/* Task file is PCI ATA format, use helpers */
258	.tf_load		= ata_tf_load,
259	.tf_read		= ata_tf_read,
260	.check_status		= ata_check_status,
261	.exec_command		= ata_exec_command,
262	.dev_select		= ata_std_dev_select,
263
264	.freeze			= ata_bmdma_freeze,
265	.thaw			= ata_bmdma_thaw,
266	.error_handler		= pacpi_error_handler,
267	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
268	.cable_detect		= pacpi_cable_detect,
269
270	/* BMDMA handling is PCI ATA format, use helpers */
271	.bmdma_setup		= ata_bmdma_setup,
272	.bmdma_start		= ata_bmdma_start,
273	.bmdma_stop		= ata_bmdma_stop,
274	.bmdma_status		= ata_bmdma_status,
275	.qc_prep		= ata_qc_prep,
276	.qc_issue		= pacpi_qc_issue_prot,
277	.data_xfer		= ata_data_xfer,
278
279	/* Timeout handling */
280	.irq_handler		= ata_interrupt,
281	.irq_clear		= ata_bmdma_irq_clear,
282	.irq_on			= ata_irq_on,
283
284	/* Generic PATA PCI ATA helpers */
285	.port_start		= pacpi_port_start,
286};
287
288
289/**
290 *	pacpi_init_one - Register ACPI ATA PCI device with kernel services
291 *	@pdev: PCI device to register
292 *	@ent: Entry in pacpi_pci_tbl matching with @pdev
293 *
294 *	Called from kernel PCI layer.
295 *
296 *	LOCKING:
297 *	Inherited from PCI layer (may sleep).
298 *
299 *	RETURNS:
300 *	Zero on success, or -ERRNO value.
301 */
302
303static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
304{
305	static const struct ata_port_info info = {
306		.sht		= &pacpi_sht,
307		.flags		= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
308
309		.pio_mask	= 0x1f,
310		.mwdma_mask	= 0x07,
311		.udma_mask 	= 0x7f,
312
313		.port_ops	= &pacpi_ops,
314	};
315	const struct ata_port_info *ppi[] = { &info, NULL };
316	return ata_pci_init_one(pdev, ppi);
317}
318
319static const struct pci_device_id pacpi_pci_tbl[] = {
320	{ PCI_ANY_ID,		PCI_ANY_ID,			   PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
321	{ }	/* terminate list */
322};
323
324static struct pci_driver pacpi_pci_driver = {
325	.name			= DRV_NAME,
326	.id_table		= pacpi_pci_tbl,
327	.probe			= pacpi_init_one,
328	.remove			= ata_pci_remove_one,
329#ifdef CONFIG_PM
330	.suspend		= ata_pci_device_suspend,
331	.resume			= ata_pci_device_resume,
332#endif
333};
334
335static int __init pacpi_init(void)
336{
337	return pci_register_driver(&pacpi_pci_driver);
338}
339
340static void __exit pacpi_exit(void)
341{
342	pci_unregister_driver(&pacpi_pci_driver);
343}
344
345module_init(pacpi_init);
346module_exit(pacpi_exit);
347
348MODULE_AUTHOR("Alan Cox");
349MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
350MODULE_LICENSE("GPL");
351MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
352MODULE_VERSION(DRV_VERSION);
353
354