aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/ata/pata_sc1200.c
blob: f49814d6fd2eaf8de34566542fb40e15be8788fa (plain) (blame)
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
/*
 * New ATA layer SC1200 driver		Alan Cox <alan@lxorguk.ukuu.org.uk>
 *
 * TODO: Mode selection filtering
 * TODO: Needs custom DMA cleanup code
 *
 * Based very heavily on
 *
 * linux/drivers/ide/pci/sc1200.c		Version 0.91	28-Jan-2003
 *
 * Copyright (C) 2000-2002		Mark Lord <mlord@pobox.com>
 * May be copied or modified under the terms of the GNU General Public License
 *
 * Development of this chipset driver was funded
 * by the nice folks at National Semiconductor.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

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

#define DRV_NAME	"sc1200"
#define DRV_VERSION	"0.2.6"

#define SC1200_REV_A	0x00
#define SC1200_REV_B1	0x01
#define SC1200_REV_B3	0x02
#define SC1200_REV_C1	0x03
#define SC1200_REV_D1	0x04

/**
 *	sc1200_clock	-	PCI clock
 *
 *	Return the PCI bus clocking for the SC1200 chipset configuration
 *	in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz
 */

static int sc1200_clock(void)
{
	/* Magic registers that give us the chipset data */
	u8 chip_id = inb(0x903C);
	u8 silicon_rev = inb(0x903D);
	u16 pci_clock;

	if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)
		return 0;	/* 33 MHz mode */

	/* Clock generator configuration 0x901E its 8/9 are the PCI clocking
	   0/3 is 33Mhz 1 is 48 2 is 66 */

	pci_clock = inw(0x901E);
	pci_clock >>= 8;
	pci_clock &= 0x03;
	if (pci_clock == 3)
		pci_clock = 0;
	return pci_clock;
}

/**
 *	sc1200_set_piomode		-	PIO setup
 *	@ap: ATA interface
 *	@adev: device on the interface
 *
 *	Set our PIO requirements. This is fairly simple on the SC1200
 */

static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	static const u32 pio_timings[4][5] = {
		{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},	// format0  33Mhz
		{0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010},	// format1, 33Mhz
		{0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021},	// format1, 48Mhz
		{0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131}	// format1, 66Mhz
	};

	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u32 format;
	unsigned int reg = 0x40 + 0x10 * ap->port_no;
	int mode = adev->pio_mode - XFER_PIO_0;

	pci_read_config_dword(pdev, reg + 4, &format);
	format >>= 31;
	format += sc1200_clock();
	pci_write_config_dword(pdev, reg + 8 * adev->devno,
				pio_timings[format][mode]);
}

/**
 *	sc1200_set_dmamode		-	DMA timing setup
 *	@ap: ATA interface
 *	@adev: Device being configured
 *
 *	We cannot mix MWDMA and UDMA without reloading timings each switch
 *	master to slave.
 */

static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
	static const u32 udma_timing[3][3] = {
		{ 0x00921250, 0x00911140, 0x00911030 },
		{ 0x00932470, 0x00922260, 0x00922140 },
		{ 0x009436A1, 0x00933481, 0x00923261 }
	};

	static const u32 mwdma_timing[3][3] = {
		{ 0x00077771, 0x00012121, 0x00002020 },
		{ 0x000BBBB2, 0x00024241, 0x00013131 },
		{ 0x000FFFF3, 0x00035352, 0x00015151 }
	};

	int clock = sc1200_clock();
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	unsigned int reg = 0x40 + 0x10 * ap->port_no;
	int mode = adev->dma_mode;
	u32 format;

	if (mode >= XFER_UDMA_0)
		format = udma_timing[clock][mode - XFER_UDMA_0];
	else
		format = mwdma_timing[clock][mode - XFER_MW_DMA_0];

	if (adev->devno == 0) {
		u32 timings;

		pci_read_config_dword(pdev, reg + 4, &timings);
		timings &= 0x80000000UL;
		timings |= format;
		pci_write_config_dword(pdev, reg + 4, timings);
	} else
		pci_write_config_dword(pdev, reg + 12, format);
}

/**
 *	sc1200_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.  Specifically we have a problem that there is only
 *	one MWDMA/UDMA bit.
 */

static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct ata_device *adev = qc->dev;
	struct ata_device *prev = ap->private_data;

	/* See if the DMA settings could be wrong */
	if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
		/* Maybe, but do the channels match MWDMA/UDMA ? */
		if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
		    (ata_using_udma(prev) && !ata_using_udma(adev)))
		    	/* Switch the mode bits */
		    	sc1200_set_dmamode(ap, adev);
	}

	return ata_sff_qc_issue(qc);
}

/**
 *	sc1200_qc_defer	-	implement serialization
 *	@qc: command
 *
 *	Serialize command issue on this controller.
 */

static int sc1200_qc_defer(struct ata_queued_cmd *qc)
{
	struct ata_host *host = qc->ap->host;
	struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
	int rc;

	/* First apply the usual rules */
	rc = ata_std_qc_defer(qc);
	if (rc != 0)
		return rc;

	/* Now apply serialization rules. Only allow a command if the
	   other channel state machine is idle */
	if (alt && alt->qc_active)
		return	ATA_DEFER_PORT;
	return 0;
}

static struct scsi_host_template sc1200_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
	.sg_tablesize	= LIBATA_DUMB_MAX_PRD,
};

static struct ata_port_operations sc1200_port_ops = {
	.inherits	= &ata_bmdma_port_ops,
	.qc_prep 	= ata_sff_dumb_qc_prep,
	.qc_issue	= sc1200_qc_issue,
	.qc_defer	= sc1200_qc_defer,
	.cable_detect	= ata_cable_40wire,
	.set_piomode	= sc1200_set_piomode,
	.set_dmamode	= sc1200_set_dmamode,
};

/**
 *	sc1200_init_one		-	Initialise an SC1200
 *	@dev: PCI device
 *	@id: Entry in match table
 *
 *	Just throw the needed data at the libata helper and it does all
 *	our work.
 */

static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
	static const struct ata_port_info info = {
		.flags = ATA_FLAG_SLAVE_POSS,
		.pio_mask = ATA_PIO4,
		.mwdma_mask = ATA_MWDMA2,
		.udma_mask = ATA_UDMA2,
		.port_ops = &sc1200_port_ops
	};
	/* Can't enable port 2 yet, see top comments */
	const struct ata_port_info *ppi[] = { &info, };

	return ata_pci_sff_init_one(dev, ppi, &sc1200_sht, NULL);
}

static const struct pci_device_id sc1200[] = {
	{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },

	{ },
};

static struct pci_driver sc1200_pci_driver = {
	.name 		= DRV_NAME,
	.id_table	= sc1200,
	.probe 		= sc1200_init_one,
	.remove		= ata_pci_remove_one,
#ifdef CONFIG_PM
	.suspend	= ata_pci_device_suspend,
	.resume		= ata_pci_device_resume,
#endif
};

static int __init sc1200_init(void)
{
	return pci_register_driver(&sc1200_pci_driver);
}

static void __exit sc1200_exit(void)
{
	pci_unregister_driver(&sc1200_pci_driver);
}

MODULE_AUTHOR("Alan Cox, Mark Lord");
MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, sc1200);
MODULE_VERSION(DRV_VERSION);

module_init(sc1200_init);
module_exit(sc1200_exit);