aboutsummaryrefslogtreecommitdiff
path: root/drivers/ata/pata_efar.c
blob: a3216850bba15e10938da4f2335f50e863b516e5 (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
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
/*
 *    pata_efar.c - EFAR PIIX clone controller driver
 *
 *	(C) 2005 Red Hat <alan@redhat.com>
 *
 *    Some parts based on ata_piix.c by Jeff Garzik and others.
 *
 *    The EFAR is a PIIX4 clone with UDMA66 support. Unlike the later
 *    Intel ICH controllers the EFAR widened the UDMA mode register bits
 *    and doesn't require the funky clock selection.
 */

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

#define DRV_NAME	"pata_efar"
#define DRV_VERSION	"0.4.4"

/**
 *	efar_pre_reset	-	Enable bits
 *	@ap: Port
 *
 *	Perform cable detection for the EFAR ATA interface. This is
 *	different to the PIIX arrangement
 */

static int efar_pre_reset(struct ata_port *ap)
{
	static const struct pci_bits efar_enable_bits[] = {
		{ 0x41U, 1U, 0x80UL, 0x80UL },	/* port 0 */
		{ 0x43U, 1U, 0x80UL, 0x80UL },	/* port 1 */
	};
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);

	if (!pci_test_config_bits(pdev, &efar_enable_bits[ap->port_no]))
		return -ENOENT;

	return ata_std_prereset(ap);
}

/**
 *	efar_probe_reset - Probe specified port on PATA host controller
 *	@ap: Port to probe
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void efar_error_handler(struct ata_port *ap)
{
	ata_bmdma_drive_eh(ap, efar_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}

/**
 *	efar_cable_detect	-	check for 40/80 pin
 *	@ap: Port
 *
 *	Perform cable detection for the EFAR ATA interface. This is
 *	different to the PIIX arrangement
 */

static int efar_cable_detect(struct ata_port *ap)
{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u8 tmp;

	pci_read_config_byte(pdev, 0x47, &tmp);
	if (tmp & (2 >> ap->port_no))
		return ATA_CBL_PATA40;
	return ATA_CBL_PATA80;
}

/**
 *	efar_set_piomode - Initialize host controller PATA PIO timings
 *	@ap: Port whose timings we are configuring
 *	@adev: um
 *
 *	Set PIO mode for device, in host controller PCI config space.
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void efar_set_piomode (struct ata_port *ap, struct ata_device *adev)
{
	unsigned int pio	= adev->pio_mode - XFER_PIO_0;
	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
	unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
	u16 idetm_data;
	int control = 0;

	/*
	 *	See Intel Document 298600-004 for the timing programing rules
	 *	for PIIX/ICH. The EFAR is a clone so very similar
	 */

	static const	 /* ISP  RTC */
	u8 timings[][2]	= { { 0, 0 },
			    { 0, 0 },
			    { 1, 0 },
			    { 2, 1 },
			    { 2, 3 }, };

	if (pio > 2)
		control |= 1;	/* TIME1 enable */
	if (ata_pio_need_iordy(adev))	/* PIO 3/4 require IORDY */
		control |= 2;	/* IE enable */
	/* Intel specifies that the PPE functionality is for disk only */
	if (adev->class == ATA_DEV_ATA)
		control |= 4;	/* PPE enable */

	pci_read_config_word(dev, idetm_port, &idetm_data);

	/* Enable PPE, IE and TIME as appropriate */

	if (adev->devno == 0) {
		idetm_data &= 0xCCF0;
		idetm_data |= control;
		idetm_data |= (timings[pio][0] << 12) |
			(timings[pio][1] << 8);
	} else {
		int shift = 4 * ap->port_no;
		u8 slave_data;

		idetm_data &= 0xCC0F;
		idetm_data |= (control << 4);

		/* Slave timing in seperate register */
		pci_read_config_byte(dev, 0x44, &slave_data);
		slave_data &= 0x0F << shift;
		slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << shift;
		pci_write_config_byte(dev, 0x44, slave_data);
	}

	idetm_data |= 0x4000;	/* Ensure SITRE is enabled */
	pci_write_config_word(dev, idetm_port, idetm_data);
}

/**
 *	efar_set_dmamode - Initialize host controller PATA DMA timings
 *	@ap: Port whose timings we are configuring
 *	@adev: Device to program
 *
 *	Set UDMA/MWDMA mode for device, in host controller PCI config space.
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void efar_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
	u8 master_port		= ap->port_no ? 0x42 : 0x40;
	u16 master_data;
	u8 speed		= adev->dma_mode;
	int devid		= adev->devno + 2 * ap->port_no;
	u8 udma_enable;

	static const	 /* ISP  RTC */
	u8 timings[][2]	= { { 0, 0 },
			    { 0, 0 },
			    { 1, 0 },
			    { 2, 1 },
			    { 2, 3 }, };

	pci_read_config_word(dev, master_port, &master_data);
	pci_read_config_byte(dev, 0x48, &udma_enable);

	if (speed >= XFER_UDMA_0) {
		unsigned int udma	= adev->dma_mode - XFER_UDMA_0;
		u16 udma_timing;

		udma_enable |= (1 << devid);

		/* Load the UDMA mode number */
		pci_read_config_word(dev, 0x4A, &udma_timing);
		udma_timing &= ~(7 << (4 * devid));
		udma_timing |= udma << (4 * devid);
		pci_write_config_word(dev, 0x4A, udma_timing);
	} else {
		/*
		 * MWDMA is driven by the PIO timings. We must also enable
		 * IORDY unconditionally along with TIME1. PPE has already
		 * been set when the PIO timing was set.
		 */
		unsigned int mwdma	= adev->dma_mode - XFER_MW_DMA_0;
		unsigned int control;
		u8 slave_data;
		const unsigned int needed_pio[3] = {
			XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
		};
		int pio = needed_pio[mwdma] - XFER_PIO_0;

		control = 3;	/* IORDY|TIME1 */

		/* If the drive MWDMA is faster than it can do PIO then
		   we must force PIO into PIO0 */

		if (adev->pio_mode < needed_pio[mwdma])
			/* Enable DMA timing only */
			control |= 8;	/* PIO cycles in PIO0 */

		if (adev->devno) {	/* Slave */
			master_data &= 0xFF4F;  /* Mask out IORDY|TIME1|DMAONLY */
			master_data |= control << 4;
			pci_read_config_byte(dev, 0x44, &slave_data);
			slave_data &= (0x0F + 0xE1 * ap->port_no);
			/* Load the matching timing */
			slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
			pci_write_config_byte(dev, 0x44, slave_data);
		} else { 	/* Master */
			master_data &= 0xCCF4;	/* Mask out IORDY|TIME1|DMAONLY
						   and master timing bits */
			master_data |= control;
			master_data |=
				(timings[pio][0] << 12) |
				(timings[pio][1] << 8);
		}
		udma_enable &= ~(1 << devid);
		pci_write_config_word(dev, master_port, master_data);
	}
	pci_write_config_byte(dev, 0x48, udma_enable);
}

static struct scsi_host_template efar_sht = {
	.module			= THIS_MODULE,
	.name			= DRV_NAME,
	.ioctl			= ata_scsi_ioctl,
	.queuecommand		= ata_scsi_queuecmd,
	.can_queue		= ATA_DEF_QUEUE,
	.this_id		= ATA_SHT_THIS_ID,
	.sg_tablesize		= LIBATA_MAX_PRD,
	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
	.emulated		= ATA_SHT_EMULATED,
	.use_clustering		= ATA_SHT_USE_CLUSTERING,
	.proc_name		= DRV_NAME,
	.dma_boundary		= ATA_DMA_BOUNDARY,
	.slave_configure	= ata_scsi_slave_config,
	.slave_destroy		= ata_scsi_slave_destroy,
	.bios_param		= ata_std_bios_param,
#ifdef CONFIG_PM
	.resume			= ata_scsi_device_resume,
	.suspend		= ata_scsi_device_suspend,
#endif
};

static const struct ata_port_operations efar_ops = {
	.port_disable		= ata_port_disable,
	.set_piomode		= efar_set_piomode,
	.set_dmamode		= efar_set_dmamode,
	.mode_filter		= ata_pci_default_filter,

	.tf_load		= ata_tf_load,
	.tf_read		= ata_tf_read,
	.check_status		= ata_check_status,
	.exec_command		= ata_exec_command,
	.dev_select		= ata_std_dev_select,

	.freeze			= ata_bmdma_freeze,
	.thaw			= ata_bmdma_thaw,
	.error_handler		= efar_error_handler,
	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
	.cable_detect		= efar_cable_detect,

	.bmdma_setup		= ata_bmdma_setup,
	.bmdma_start		= ata_bmdma_start,
	.bmdma_stop		= ata_bmdma_stop,
	.bmdma_status		= ata_bmdma_status,
	.qc_prep		= ata_qc_prep,
	.qc_issue		= ata_qc_issue_prot,
	.data_xfer		= ata_data_xfer,

	.irq_handler		= ata_interrupt,
	.irq_clear		= ata_bmdma_irq_clear,
	.irq_on			= ata_irq_on,
	.irq_ack		= ata_irq_ack,

	.port_start		= ata_port_start,
};


/**
 *	efar_init_one - Register EFAR ATA PCI device with kernel services
 *	@pdev: PCI device to register
 *	@ent: Entry in efar_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 efar_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
{
	static int printed_version;
	static struct ata_port_info info = {
		.sht		= &efar_sht,
		.flags		= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
		.pio_mask	= 0x1f,	/* pio0-4 */
		.mwdma_mask	= 0x07, /* mwdma1-2 */
		.udma_mask 	= 0x0f, /* UDMA 66 */
		.port_ops	= &efar_ops,
	};
	static struct ata_port_info *port_info[2] = { &info, &info };

	if (!printed_version++)
		dev_printk(KERN_DEBUG, &pdev->dev,
			   "version " DRV_VERSION "\n");

	return ata_pci_init_one(pdev, port_info, 2);
}

static const struct pci_device_id efar_pci_tbl[] = {
	{ PCI_VDEVICE(EFAR, 0x9130), },

	{ }	/* terminate list */
};

static struct pci_driver efar_pci_driver = {
	.name			= DRV_NAME,
	.id_table		= efar_pci_tbl,
	.probe			= efar_init_one,
	.remove			= ata_pci_remove_one,
#ifdef CONFIG_PM
	.suspend		= ata_pci_device_suspend,
	.resume			= ata_pci_device_resume,
#endif
};

static int __init efar_init(void)
{
	return pci_register_driver(&efar_pci_driver);
}

static void __exit efar_exit(void)
{
	pci_unregister_driver(&efar_pci_driver);
}

module_init(efar_init);
module_exit(efar_exit);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("SCSI low-level driver for EFAR PIIX clones");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, efar_pci_tbl);
MODULE_VERSION(DRV_VERSION);