2 * pata_opti.c - ATI PATA for new ATA layer
6 * linux/drivers/ide/pci/opti621.c Version 0.7 Sept 10, 2002
8 * Copyright (C) 1996-1998 Linus Torvalds & authors (see below)
11 * Jaromir Koutek <miri@punknet.cz>,
12 * Jan Harkes <jaharkes@cwi.nl>,
13 * Mark Lord <mlord@pobox.com>
14 * Some parts of code are from ali14xx.c and from rz1000.c.
16 * Also consulted the FreeBSD prototype driver by Kevin Day to try
17 * and resolve some confusions. Further documentation can be found in
18 * Ralf Brown's interrupt list
20 * If you have other variants of the Opti range (Viper/Vendetta) please
21 * try this driver with those PCI idents and report back. For the later
22 * chips see the pata_optidma driver
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/pci.h>
29 #include <linux/init.h>
30 #include <linux/blkdev.h>
31 #include <linux/delay.h>
32 #include <scsi/scsi_host.h>
33 #include <linux/libata.h>
35 #define DRV_NAME "pata_opti"
36 #define DRV_VERSION "0.2.9"
39 READ_REG = 0, /* index of Read cycle timing register */
40 WRITE_REG = 1, /* index of Write cycle timing register */
41 CNTRL_REG = 3, /* index of Control register */
42 STRAP_REG = 5, /* index of Strap register */
43 MISC_REG = 6 /* index of Miscellaneous register */
47 * opti_pre_reset - probe begin
49 * @deadline: deadline jiffies for the operation
51 * Set up cable type and use generic probe init
54 static int opti_pre_reset(struct ata_link *link, unsigned long deadline)
56 struct ata_port *ap = link->ap;
57 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
58 static const struct pci_bits opti_enable_bits[] = {
59 { 0x45, 1, 0x80, 0x00 },
60 { 0x40, 1, 0x08, 0x00 }
63 if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no]))
66 return ata_sff_prereset(link, deadline);
70 * opti_write_reg - control register setup
73 * @reg: control register number
75 * The Opti uses magic 'trapdoor' register accesses to do configuration
76 * rather than using PCI space as other controllers do. The double inw
77 * on the error register activates configuration mode. We can then write
78 * the control register
81 static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
83 void __iomem *regio = ap->ioaddr.cmd_addr;
85 /* These 3 unlock the control register access */
88 iowrite8(3, regio + 2);
91 iowrite8(val, regio + reg);
94 iowrite8(0x83, regio + 2);
98 * opti_set_piomode - set initial PIO mode data
102 * Called to do the PIO mode setup. Timing numbers are taken from
103 * the FreeBSD driver then pre computed to keep the code clean. There
104 * are two tables depending on the hardware clock speed.
107 static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
109 struct ata_device *pair = ata_dev_pair(adev);
111 int pio = adev->pio_mode - XFER_PIO_0;
112 void __iomem *regio = ap->ioaddr.cmd_addr;
115 /* Address table precomputed with prefetch off and a DCLK of 2 */
116 static const u8 addr_timing[2][5] = {
117 { 0x30, 0x20, 0x20, 0x10, 0x10 },
118 { 0x20, 0x20, 0x10, 0x10, 0x10 }
120 static const u8 data_rec_timing[2][5] = {
121 { 0x6B, 0x56, 0x42, 0x32, 0x31 },
122 { 0x58, 0x44, 0x32, 0x22, 0x21 }
125 iowrite8(0xff, regio + 5);
126 clock = ioread16(regio + 5) & 1;
129 * As with many controllers the address setup time is shared
130 * and must suit both devices if present.
133 addr = addr_timing[clock][pio];
135 /* Hardware constraint */
136 u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
137 if (pair_addr > addr)
141 /* Commence primary programming sequence */
142 opti_write_reg(ap, adev->devno, MISC_REG);
143 opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
144 opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
145 opti_write_reg(ap, addr, MISC_REG);
147 /* Programming sequence complete, override strapping */
148 opti_write_reg(ap, 0x85, CNTRL_REG);
151 static struct scsi_host_template opti_sht = {
152 ATA_PIO_SHT(DRV_NAME),
155 static struct ata_port_operations opti_port_ops = {
156 .inherits = &ata_sff_port_ops,
157 .cable_detect = ata_cable_40wire,
158 .set_piomode = opti_set_piomode,
159 .prereset = opti_pre_reset,
162 static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
164 static const struct ata_port_info info = {
165 .flags = ATA_FLAG_SLAVE_POSS,
167 .port_ops = &opti_port_ops
169 const struct ata_port_info *ppi[] = { &info, NULL };
170 static int printed_version;
172 if (!printed_version++)
173 dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
175 return ata_pci_sff_init_one(dev, ppi, &opti_sht, NULL);
178 static const struct pci_device_id opti[] = {
179 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
180 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
185 static struct pci_driver opti_pci_driver = {
188 .probe = opti_init_one,
189 .remove = ata_pci_remove_one,
191 .suspend = ata_pci_device_suspend,
192 .resume = ata_pci_device_resume,
196 static int __init opti_init(void)
198 return pci_register_driver(&opti_pci_driver);
201 static void __exit opti_exit(void)
203 pci_unregister_driver(&opti_pci_driver);
207 MODULE_AUTHOR("Alan Cox");
208 MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
209 MODULE_LICENSE("GPL");
210 MODULE_DEVICE_TABLE(pci, opti);
211 MODULE_VERSION(DRV_VERSION);
213 module_init(opti_init);
214 module_exit(opti_exit);