xref: /linux/drivers/ata/pata_triflex.c (revision 1ac731c529cd4d6adbce134754b51ff7d822b145)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * pata_triflex.c 	- Compaq PATA for new ATA layer
4  *			  (C) 2005 Red Hat Inc
5  *			  Alan Cox <alan@lxorguk.ukuu.org.uk>
6  *
7  * based upon
8  *
9  * triflex.c
10  *
11  * IDE Chipset driver for the Compaq TriFlex IDE controller.
12  *
13  * Known to work with the Compaq Workstation 5x00 series.
14  *
15  * Copyright (C) 2002 Hewlett-Packard Development Group, L.P.
16  * Author: Torben Mathiasen <torben.mathiasen@hp.com>
17  *
18  * Loosely based on the piix & svwks drivers.
19  *
20  * Documentation:
21  *	Not publicly available.
22  */
23 
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/pci.h>
27 #include <linux/blkdev.h>
28 #include <linux/delay.h>
29 #include <scsi/scsi_host.h>
30 #include <linux/libata.h>
31 
32 #define DRV_NAME "pata_triflex"
33 #define DRV_VERSION "0.2.8"
34 
35 /**
36  *	triflex_prereset		-	probe begin
37  *	@link: ATA link
38  *	@deadline: deadline jiffies for the operation
39  *
40  *	Set up cable type and use generic probe init
41  */
42 
triflex_prereset(struct ata_link * link,unsigned long deadline)43 static int triflex_prereset(struct ata_link *link, unsigned long deadline)
44 {
45 	static const struct pci_bits triflex_enable_bits[] = {
46 		{ 0x80, 1, 0x01, 0x01 },
47 		{ 0x80, 1, 0x02, 0x02 }
48 	};
49 
50 	struct ata_port *ap = link->ap;
51 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
52 
53 	if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
54 		return -ENOENT;
55 
56 	return ata_sff_prereset(link, deadline);
57 }
58 
59 
60 
61 /**
62  *	triflex_load_timing		-	timing configuration
63  *	@ap: ATA interface
64  *	@adev: Device on the bus
65  *	@speed: speed to configure
66  *
67  *	The Triflex has one set of timings per device per channel. This
68  *	means we must do some switching. As the PIO and DMA timings don't
69  *	match we have to do some reloading unlike PIIX devices where tuning
70  *	tricks can avoid it.
71  */
72 
triflex_load_timing(struct ata_port * ap,struct ata_device * adev,int speed)73 static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
74 {
75 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
76 	u32 timing = 0;
77 	u32 triflex_timing, old_triflex_timing;
78 	int channel_offset = ap->port_no ? 0x74: 0x70;
79 	unsigned int is_slave	= (adev->devno != 0);
80 
81 
82 	pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
83 	triflex_timing = old_triflex_timing;
84 
85 	switch(speed)
86 	{
87 		case XFER_MW_DMA_2:
88 			timing = 0x0103;break;
89 		case XFER_MW_DMA_1:
90 			timing = 0x0203;break;
91 		case XFER_MW_DMA_0:
92 			timing = 0x0808;break;
93 		case XFER_SW_DMA_2:
94 		case XFER_SW_DMA_1:
95 		case XFER_SW_DMA_0:
96 			timing = 0x0F0F;break;
97 		case XFER_PIO_4:
98 			timing = 0x0202;break;
99 		case XFER_PIO_3:
100 			timing = 0x0204;break;
101 		case XFER_PIO_2:
102 			timing = 0x0404;break;
103 		case XFER_PIO_1:
104 			timing = 0x0508;break;
105 		case XFER_PIO_0:
106 			timing = 0x0808;break;
107 		default:
108 			BUG();
109 	}
110 	triflex_timing &= ~ (0xFFFF << (16 * is_slave));
111 	triflex_timing |= (timing << (16 * is_slave));
112 
113 	if (triflex_timing != old_triflex_timing)
114 		pci_write_config_dword(pdev, channel_offset, triflex_timing);
115 }
116 
117 /**
118  *	triflex_set_piomode	-	set initial PIO mode data
119  *	@ap: ATA interface
120  *	@adev: ATA device
121  *
122  *	Use the timing loader to set up the PIO mode. We have to do this
123  *	because DMA start/stop will only be called once DMA occurs. If there
124  *	has been no DMA then the PIO timings are still needed.
125  */
triflex_set_piomode(struct ata_port * ap,struct ata_device * adev)126 static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
127 {
128 	triflex_load_timing(ap, adev, adev->pio_mode);
129 }
130 
131 /**
132  *	triflex_bmdma_start	-	DMA start callback
133  *	@qc: Command in progress
134  *
135  *	Usually drivers set the DMA timing at the point the set_dmamode call
136  *	is made. Triflex however requires we load new timings on the
137  *	transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).
138  *	We load the DMA timings just before starting DMA and then restore
139  *	the PIO timing when the DMA is finished.
140  */
141 
triflex_bmdma_start(struct ata_queued_cmd * qc)142 static void triflex_bmdma_start(struct ata_queued_cmd *qc)
143 {
144 	triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
145 	ata_bmdma_start(qc);
146 }
147 
148 /**
149  *	triflex_bmdma_stop	-	DMA stop callback
150  *	@qc: ATA command
151  *
152  *	We loaded new timings in dma_start, as a result we need to restore
153  *	the PIO timings in dma_stop so that the next command issue gets the
154  *	right clock values.
155  */
156 
triflex_bmdma_stop(struct ata_queued_cmd * qc)157 static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
158 {
159 	ata_bmdma_stop(qc);
160 	triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
161 }
162 
163 static const struct scsi_host_template triflex_sht = {
164 	ATA_BMDMA_SHT(DRV_NAME),
165 };
166 
167 static struct ata_port_operations triflex_port_ops = {
168 	.inherits	= &ata_bmdma_port_ops,
169 	.bmdma_start 	= triflex_bmdma_start,
170 	.bmdma_stop	= triflex_bmdma_stop,
171 	.cable_detect	= ata_cable_40wire,
172 	.set_piomode	= triflex_set_piomode,
173 	.prereset	= triflex_prereset,
174 };
175 
triflex_init_one(struct pci_dev * dev,const struct pci_device_id * id)176 static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
177 {
178 	static const struct ata_port_info info = {
179 		.flags = ATA_FLAG_SLAVE_POSS,
180 		.pio_mask = ATA_PIO4,
181 		.mwdma_mask = ATA_MWDMA2,
182 		.port_ops = &triflex_port_ops
183 	};
184 	const struct ata_port_info *ppi[] = { &info, NULL };
185 
186 	ata_print_version_once(&dev->dev, DRV_VERSION);
187 
188 	return ata_pci_bmdma_init_one(dev, ppi, &triflex_sht, NULL, 0);
189 }
190 
191 static const struct pci_device_id triflex[] = {
192 	{ PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },
193 
194 	{ },
195 };
196 
197 #ifdef CONFIG_PM_SLEEP
triflex_ata_pci_device_suspend(struct pci_dev * pdev,pm_message_t mesg)198 static int triflex_ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
199 {
200 	struct ata_host *host = pci_get_drvdata(pdev);
201 
202 	ata_host_suspend(host, mesg);
203 
204 	/*
205 	 * We must not disable or powerdown the device.
206 	 * APM bios refuses to suspend if IDE is not accessible.
207 	 */
208 	pci_save_state(pdev);
209 
210 	return 0;
211 }
212 
213 #endif
214 
215 static struct pci_driver triflex_pci_driver = {
216 	.name 		= DRV_NAME,
217 	.id_table	= triflex,
218 	.probe 		= triflex_init_one,
219 	.remove		= ata_pci_remove_one,
220 #ifdef CONFIG_PM_SLEEP
221 	.suspend	= triflex_ata_pci_device_suspend,
222 	.resume		= ata_pci_device_resume,
223 #endif
224 };
225 
226 module_pci_driver(triflex_pci_driver);
227 
228 MODULE_AUTHOR("Alan Cox");
229 MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
230 MODULE_LICENSE("GPL");
231 MODULE_DEVICE_TABLE(pci, triflex);
232 MODULE_VERSION(DRV_VERSION);
233