2 * pata_opti.c - ATI PATA for new ATA layer
4 * Alan Cox <alan@redhat.com>
7 * linux/drivers/ide/pci/opti621.c Version 0.7 Sept 10, 2002
9 * Copyright (C) 1996-1998 Linus Torvalds & authors (see below)
12 * Jaromir Koutek <miri@punknet.cz>,
13 * Jan Harkes <jaharkes@cwi.nl>,
14 * Mark Lord <mlord@pobox.com>
15 * Some parts of code are from ali14xx.c and from rz1000.c.
17 * Also consulted the FreeBSD prototype driver by Kevin Day to try
18 * and resolve some confusions. Further documentation can be found in
19 * Ralf Brown's interrupt list
21 * If you have other variants of the Opti range (Viper/Vendetta) please
22 * try this driver with those PCI idents and report back. For the later
23 * chips see the pata_optidma driver
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/pci.h>
30 #include <linux/init.h>
31 #include <linux/blkdev.h>
32 #include <linux/delay.h>
33 #include <scsi/scsi_host.h>
34 #include <linux/libata.h>
36 #define DRV_NAME "pata_opti"
37 #define DRV_VERSION "0.2.9"
40 READ_REG = 0, /* index of Read cycle timing register */
41 WRITE_REG = 1, /* index of Write cycle timing register */
42 CNTRL_REG = 3, /* index of Control register */
43 STRAP_REG = 5, /* index of Strap register */
44 MISC_REG = 6 /* index of Miscellaneous register */
48 * opti_pre_reset - probe begin
50 * @deadline: deadline jiffies for the operation
52 * Set up cable type and use generic probe init
55 static int opti_pre_reset(struct ata_link *link, unsigned long deadline)
57 struct ata_port *ap = link->ap;
58 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
59 static const struct pci_bits opti_enable_bits[] = {
60 { 0x45, 1, 0x80, 0x00 },
61 { 0x40, 1, 0x08, 0x00 }
64 if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no]))
67 return ata_sff_prereset(link, deadline);
71 * opti_write_reg - control register setup
74 * @reg: control register number
76 * The Opti uses magic 'trapdoor' register accesses to do configuration
77 * rather than using PCI space as other controllers do. The double inw
78 * on the error register activates configuration mode. We can then write
79 * the control register
82 static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
84 void __iomem *regio = ap->ioaddr.cmd_addr;
86 /* These 3 unlock the control register access */
89 iowrite8(3, regio + 2);
92 iowrite8(val, regio + reg);
95 iowrite8(0x83, regio + 2);
99 * opti_set_piomode - set initial PIO mode data
103 * Called to do the PIO mode setup. Timing numbers are taken from
104 * the FreeBSD driver then pre computed to keep the code clean. There
105 * are two tables depending on the hardware clock speed.
108 static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
110 struct ata_device *pair = ata_dev_pair(adev);
112 int pio = adev->pio_mode - XFER_PIO_0;
113 void __iomem *regio = ap->ioaddr.cmd_addr;
116 /* Address table precomputed with prefetch off and a DCLK of 2 */
117 static const u8 addr_timing[2][5] = {
118 { 0x30, 0x20, 0x20, 0x10, 0x10 },
119 { 0x20, 0x20, 0x10, 0x10, 0x10 }
121 static const u8 data_rec_timing[2][5] = {
122 { 0x6B, 0x56, 0x42, 0x32, 0x31 },
123 { 0x58, 0x44, 0x32, 0x22, 0x21 }
126 iowrite8(0xff, regio + 5);
127 clock = ioread16(regio + 5) & 1;
130 * As with many controllers the address setup time is shared
131 * and must suit both devices if present.
134 addr = addr_timing[clock][pio];
136 /* Hardware constraint */
137 u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
138 if (pair_addr > addr)
142 /* Commence primary programming sequence */
143 opti_write_reg(ap, adev->devno, MISC_REG);
144 opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
145 opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
146 opti_write_reg(ap, addr, MISC_REG);
148 /* Programming sequence complete, override strapping */
149 opti_write_reg(ap, 0x85, CNTRL_REG);
152 static struct scsi_host_template opti_sht = {
153 ATA_PIO_SHT(DRV_NAME),
156 static struct ata_port_operations opti_port_ops = {
157 .inherits = &ata_sff_port_ops,
158 .cable_detect = ata_cable_40wire,
159 .set_piomode = opti_set_piomode,
160 .prereset = opti_pre_reset,
163 static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
165 static const struct ata_port_info info = {
166 .flags = ATA_FLAG_SLAVE_POSS,
168 .port_ops = &opti_port_ops
170 const struct ata_port_info *ppi[] = { &info, NULL };
171 static int printed_version;
173 if (!printed_version++)
174 dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
176 return ata_pci_sff_init_one(dev, ppi, &opti_sht, NULL);
179 static const struct pci_device_id opti[] = {
180 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
181 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
186 static struct pci_driver opti_pci_driver = {
189 .probe = opti_init_one,
190 .remove = ata_pci_remove_one,
192 .suspend = ata_pci_device_suspend,
193 .resume = ata_pci_device_resume,
197 static int __init opti_init(void)
199 return pci_register_driver(&opti_pci_driver);
202 static void __exit opti_exit(void)
204 pci_unregister_driver(&opti_pci_driver);
208 MODULE_AUTHOR("Alan Cox");
209 MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
210 MODULE_LICENSE("GPL");
211 MODULE_DEVICE_TABLE(pci, opti);
212 MODULE_VERSION(DRV_VERSION);
214 module_init(opti_init);
215 module_exit(opti_exit);