xref: /openbmc/linux/drivers/ata/pata_triflex.c (revision e23feb16)
1 /*
2  * pata_triflex.c 	- Compaq PATA for new ATA layer
3  *			  (C) 2005 Red Hat Inc
4  *			  Alan Cox <alan@lxorguk.ukuu.org.uk>
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 publicly 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  *	@link: ATA link
51  *	@deadline: deadline jiffies for the operation
52  *
53  *	Set up cable type and use generic probe init
54  */
55 
56 static int triflex_prereset(struct ata_link *link, 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 ata_port *ap = link->ap;
64 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
65 
66 	if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
67 		return -ENOENT;
68 
69 	return ata_sff_prereset(link, deadline);
70 }
71 
72 
73 
74 /**
75  *	triflex_load_timing		-	timing configuration
76  *	@ap: ATA interface
77  *	@adev: Device on the bus
78  *	@speed: speed to configure
79  *
80  *	The Triflex has one set of timings per device per channel. This
81  *	means we must do some switching. As the PIO and DMA timings don't
82  *	match we have to do some reloading unlike PIIX devices where tuning
83  *	tricks can avoid it.
84  */
85 
86 static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
87 {
88 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
89 	u32 timing = 0;
90 	u32 triflex_timing, old_triflex_timing;
91 	int channel_offset = ap->port_no ? 0x74: 0x70;
92 	unsigned int is_slave	= (adev->devno != 0);
93 
94 
95 	pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
96 	triflex_timing = old_triflex_timing;
97 
98 	switch(speed)
99 	{
100 		case XFER_MW_DMA_2:
101 			timing = 0x0103;break;
102 		case XFER_MW_DMA_1:
103 			timing = 0x0203;break;
104 		case XFER_MW_DMA_0:
105 			timing = 0x0808;break;
106 		case XFER_SW_DMA_2:
107 		case XFER_SW_DMA_1:
108 		case XFER_SW_DMA_0:
109 			timing = 0x0F0F;break;
110 		case XFER_PIO_4:
111 			timing = 0x0202;break;
112 		case XFER_PIO_3:
113 			timing = 0x0204;break;
114 		case XFER_PIO_2:
115 			timing = 0x0404;break;
116 		case XFER_PIO_1:
117 			timing = 0x0508;break;
118 		case XFER_PIO_0:
119 			timing = 0x0808;break;
120 		default:
121 			BUG();
122 	}
123 	triflex_timing &= ~ (0xFFFF << (16 * is_slave));
124 	triflex_timing |= (timing << (16 * is_slave));
125 
126 	if (triflex_timing != old_triflex_timing)
127 		pci_write_config_dword(pdev, channel_offset, triflex_timing);
128 }
129 
130 /**
131  *	triflex_set_piomode	-	set initial PIO mode data
132  *	@ap: ATA interface
133  *	@adev: ATA device
134  *
135  *	Use the timing loader to set up the PIO mode. We have to do this
136  *	because DMA start/stop will only be called once DMA occurs. If there
137  *	has been no DMA then the PIO timings are still needed.
138  */
139 static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
140 {
141 	triflex_load_timing(ap, adev, adev->pio_mode);
142 }
143 
144 /**
145  *	triflex_dma_start	-	DMA start callback
146  *	@qc: Command in progress
147  *
148  *	Usually drivers set the DMA timing at the point the set_dmamode call
149  *	is made. Triflex however requires we load new timings on the
150  *	transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).
151  *	We load the DMA timings just before starting DMA and then restore
152  *	the PIO timing when the DMA is finished.
153  */
154 
155 static void triflex_bmdma_start(struct ata_queued_cmd *qc)
156 {
157 	triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
158 	ata_bmdma_start(qc);
159 }
160 
161 /**
162  *	triflex_dma_stop	-	DMA stop callback
163  *	@ap: ATA interface
164  *	@adev: ATA device
165  *
166  *	We loaded new timings in dma_start, as a result we need to restore
167  *	the PIO timings in dma_stop so that the next command issue gets the
168  *	right clock values.
169  */
170 
171 static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
172 {
173 	ata_bmdma_stop(qc);
174 	triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
175 }
176 
177 static struct scsi_host_template triflex_sht = {
178 	ATA_BMDMA_SHT(DRV_NAME),
179 };
180 
181 static struct ata_port_operations triflex_port_ops = {
182 	.inherits	= &ata_bmdma_port_ops,
183 	.bmdma_start 	= triflex_bmdma_start,
184 	.bmdma_stop	= triflex_bmdma_stop,
185 	.cable_detect	= ata_cable_40wire,
186 	.set_piomode	= triflex_set_piomode,
187 	.prereset	= triflex_prereset,
188 };
189 
190 static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
191 {
192 	static const struct ata_port_info info = {
193 		.flags = ATA_FLAG_SLAVE_POSS,
194 		.pio_mask = ATA_PIO4,
195 		.mwdma_mask = ATA_MWDMA2,
196 		.port_ops = &triflex_port_ops
197 	};
198 	const struct ata_port_info *ppi[] = { &info, NULL };
199 
200 	ata_print_version_once(&dev->dev, DRV_VERSION);
201 
202 	return ata_pci_bmdma_init_one(dev, ppi, &triflex_sht, NULL, 0);
203 }
204 
205 static const struct pci_device_id triflex[] = {
206 	{ PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },
207 
208 	{ },
209 };
210 
211 #ifdef CONFIG_PM
212 static int triflex_ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
213 {
214 	struct ata_host *host = pci_get_drvdata(pdev);
215 	int rc = 0;
216 
217 	rc = ata_host_suspend(host, mesg);
218 	if (rc)
219 		return rc;
220 
221 	/*
222 	 * We must not disable or powerdown the device.
223 	 * APM bios refuses to suspend if IDE is not accessible.
224 	 */
225 	pci_save_state(pdev);
226 
227 	return 0;
228 }
229 
230 #endif
231 
232 static struct pci_driver triflex_pci_driver = {
233 	.name 		= DRV_NAME,
234 	.id_table	= triflex,
235 	.probe 		= triflex_init_one,
236 	.remove		= ata_pci_remove_one,
237 #ifdef CONFIG_PM
238 	.suspend	= triflex_ata_pci_device_suspend,
239 	.resume		= ata_pci_device_resume,
240 #endif
241 };
242 
243 module_pci_driver(triflex_pci_driver);
244 
245 MODULE_AUTHOR("Alan Cox");
246 MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
247 MODULE_LICENSE("GPL");
248 MODULE_DEVICE_TABLE(pci, triflex);
249 MODULE_VERSION(DRV_VERSION);
250