1/*
2 * pata_triflex.c 	- Compaq PATA for new ATA layer
3 *			  (C) 2005 Red Hat Inc
4 *			  Alan Cox <alan@redhat.com>
5 *
6 * based upon
7 *
8 * triflex.c
9 *
10 * IDE Chipset driver for the Compaq TriFlex IDE controller.
11 *
12 * Known to work with the Compaq Workstation 5x00 series.
13 *
14 * Copyright (C) 2002 Hewlett-Packard Development Group, L.P.
15 * Author: Torben Mathiasen <torben.mathiasen@hp.com>
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License version 2 as
19 * published by the Free Software Foundation.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
29 *
30 * Loosely based on the piix & svwks drivers.
31 *
32 * Documentation:
33 *	Not publically available.
34 */
35
36#include <linux/kernel.h>
37#include <linux/module.h>
38#include <linux/pci.h>
39#include <linux/init.h>
40#include <linux/blkdev.h>
41#include <linux/delay.h>
42#include <scsi/scsi_host.h>
43#include <linux/libata.h>
44
45#define DRV_NAME "pata_triflex"
46#define DRV_VERSION "0.2.8"
47
48/**
49 *	triflex_prereset		-	probe begin
50 *	@ap: ATA port
51 *	@deadline: deadline jiffies for the operation
52 *
53 *	Set up cable type and use generic probe init
54 */
55
56static int triflex_prereset(struct ata_port *ap, unsigned long deadline)
57{
58	static const struct pci_bits triflex_enable_bits[] = {
59		{ 0x80, 1, 0x01, 0x01 },
60		{ 0x80, 1, 0x02, 0x02 }
61	};
62
63	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
64
65	if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
66		return -ENOENT;
67
68	return ata_std_prereset(ap, deadline);
69}
70
71
72
73static void triflex_error_handler(struct ata_port *ap)
74{
75	ata_bmdma_drive_eh(ap, triflex_prereset, ata_std_softreset, NULL, ata_std_postreset);
76}
77
78/**
79 *	triflex_load_timing		-	timing configuration
80 *	@ap: ATA interface
81 *	@adev: Device on the bus
82 *	@speed: speed to configure
83 *
84 *	The Triflex has one set of timings per device per channel. This
85 *	means we must do some switching. As the PIO and DMA timings don't
86 *	match we have to do some reloading unlike PIIX devices where tuning
87 *	tricks can avoid it.
88 */
89
90static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
91{
92	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
93	u32 timing = 0;
94	u32 triflex_timing, old_triflex_timing;
95	int channel_offset = ap->port_no ? 0x74: 0x70;
96	unsigned int is_slave	= (adev->devno != 0);
97
98
99	pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
100	triflex_timing = old_triflex_timing;
101
102	switch(speed)
103	{
104		case XFER_MW_DMA_2:
105			timing = 0x0103;break;
106		case XFER_MW_DMA_1:
107			timing = 0x0203;break;
108		case XFER_MW_DMA_0:
109			timing = 0x0808;break;
110		case XFER_SW_DMA_2:
111		case XFER_SW_DMA_1:
112		case XFER_SW_DMA_0:
113			timing = 0x0F0F;break;
114		case XFER_PIO_4:
115			timing = 0x0202;break;
116		case XFER_PIO_3:
117			timing = 0x0204;break;
118		case XFER_PIO_2:
119			timing = 0x0404;break;
120		case XFER_PIO_1:
121			timing = 0x0508;break;
122		case XFER_PIO_0:
123			timing = 0x0808;break;
124		default:
125			BUG();
126	}
127	triflex_timing &= ~ (0xFFFF << (16 * is_slave));
128	triflex_timing |= (timing << (16 * is_slave));
129
130	if (triflex_timing != old_triflex_timing)
131		pci_write_config_dword(pdev, channel_offset, triflex_timing);
132}
133
134/**
135 *	triflex_set_piomode	-	set initial PIO mode data
136 *	@ap: ATA interface
137 *	@adev: ATA device
138 *
139 *	Use the timing loader to set up the PIO mode. We have to do this
140 *	because DMA start/stop will only be called once DMA occurs. If there
141 *	has been no DMA then the PIO timings are still needed.
142 */
143static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
144{
145	triflex_load_timing(ap, adev, adev->pio_mode);
146}
147
148/**
149 *	triflex_dma_start	-	DMA start callback
150 *	@qc: Command in progress
151 *
152 *	Usually drivers set the DMA timing at the point the set_dmamode call
153 *	is made. Triflex however requires we load new timings on the
154 *	transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).
155 *	We load the DMA timings just before starting DMA and then restore
156 *	the PIO timing when the DMA is finished.
157 */
158
159static void triflex_bmdma_start(struct ata_queued_cmd *qc)
160{
161	triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
162	ata_bmdma_start(qc);
163}
164
165/**
166 *	triflex_dma_stop	-	DMA stop callback
167 *	@ap: ATA interface
168 *	@adev: ATA device
169 *
170 *	We loaded new timings in dma_start, as a result we need to restore
171 *	the PIO timings in dma_stop so that the next command issue gets the
172 *	right clock values.
173 */
174
175static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
176{
177	ata_bmdma_stop(qc);
178	triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
179}
180
181static struct scsi_host_template triflex_sht = {
182	.module			= THIS_MODULE,
183	.name			= DRV_NAME,
184	.ioctl			= ata_scsi_ioctl,
185	.queuecommand		= ata_scsi_queuecmd,
186	.can_queue		= ATA_DEF_QUEUE,
187	.this_id		= ATA_SHT_THIS_ID,
188	.sg_tablesize		= LIBATA_MAX_PRD,
189	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
190	.emulated		= ATA_SHT_EMULATED,
191	.use_clustering		= ATA_SHT_USE_CLUSTERING,
192	.proc_name		= DRV_NAME,
193	.dma_boundary		= ATA_DMA_BOUNDARY,
194	.slave_configure	= ata_scsi_slave_config,
195	.slave_destroy		= ata_scsi_slave_destroy,
196	.bios_param		= ata_std_bios_param,
197};
198
199static struct ata_port_operations triflex_port_ops = {
200	.port_disable	= ata_port_disable,
201	.set_piomode	= triflex_set_piomode,
202	.mode_filter	= ata_pci_default_filter,
203
204	.tf_load	= ata_tf_load,
205	.tf_read	= ata_tf_read,
206	.check_status 	= ata_check_status,
207	.exec_command	= ata_exec_command,
208	.dev_select 	= ata_std_dev_select,
209
210	.freeze		= ata_bmdma_freeze,
211	.thaw		= ata_bmdma_thaw,
212	.error_handler	= triflex_error_handler,
213	.post_internal_cmd = ata_bmdma_post_internal_cmd,
214	.cable_detect	= ata_cable_40wire,
215
216	.bmdma_setup 	= ata_bmdma_setup,
217	.bmdma_start 	= triflex_bmdma_start,
218	.bmdma_stop	= triflex_bmdma_stop,
219	.bmdma_status 	= ata_bmdma_status,
220
221	.qc_prep 	= ata_qc_prep,
222	.qc_issue	= ata_qc_issue_prot,
223
224	.data_xfer	= ata_data_xfer,
225
226	.irq_handler	= ata_interrupt,
227	.irq_clear	= ata_bmdma_irq_clear,
228	.irq_on		= ata_irq_on,
229	.irq_ack	= ata_irq_ack,
230
231	.port_start	= ata_port_start,
232};
233
234static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
235{
236	static const struct ata_port_info info = {
237		.sht = &triflex_sht,
238		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
239		.pio_mask = 0x1f,
240		.mwdma_mask = 0x07,
241		.port_ops = &triflex_port_ops
242	};
243	const struct ata_port_info *ppi[] = { &info, NULL };
244	static int printed_version;
245
246	if (!printed_version++)
247		dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
248
249	return ata_pci_init_one(dev, ppi);
250}
251
252static const struct pci_device_id triflex[] = {
253	{ PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },
254
255	{ },
256};
257
258static struct pci_driver triflex_pci_driver = {
259	.name 		= DRV_NAME,
260	.id_table	= triflex,
261	.probe 		= triflex_init_one,
262	.remove		= ata_pci_remove_one,
263#ifdef CONFIG_PM
264	.suspend	= ata_pci_device_suspend,
265	.resume		= ata_pci_device_resume,
266#endif
267};
268
269static int __init triflex_init(void)
270{
271	return pci_register_driver(&triflex_pci_driver);
272}
273
274static void __exit triflex_exit(void)
275{
276	pci_unregister_driver(&triflex_pci_driver);
277}
278
279MODULE_AUTHOR("Alan Cox");
280MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
281MODULE_LICENSE("GPL");
282MODULE_DEVICE_TABLE(pci, triflex);
283MODULE_VERSION(DRV_VERSION);
284
285module_init(triflex_init);
286module_exit(triflex_exit);
287