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_std_prereset(link, deadline);
71 * opti_probe_reset - probe reset
74 * Perform the ATA probe and bus reset sequence plus specific handling
75 * for this hardware. The Opti needs little handling - we have no UDMA66
76 * capability that needs cable detection. All we must do is check the port
80 static void opti_error_handler(struct ata_port *ap)
82 ata_bmdma_drive_eh(ap, opti_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
86 * opti_write_reg - control register setup
89 * @reg: control register number
91 * The Opti uses magic 'trapdoor' register accesses to do configuration
92 * rather than using PCI space as other controllers do. The double inw
93 * on the error register activates configuration mode. We can then write
94 * the control register
97 static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
99 void __iomem *regio = ap->ioaddr.cmd_addr;
101 /* These 3 unlock the control register access */
104 iowrite8(3, regio + 2);
107 iowrite8(val, regio + reg);
110 iowrite8(0x83, regio + 2);
114 * opti_set_piomode - set initial PIO mode data
118 * Called to do the PIO mode setup. Timing numbers are taken from
119 * the FreeBSD driver then pre computed to keep the code clean. There
120 * are two tables depending on the hardware clock speed.
123 static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
125 struct ata_device *pair = ata_dev_pair(adev);
127 int pio = adev->pio_mode - XFER_PIO_0;
128 void __iomem *regio = ap->ioaddr.cmd_addr;
131 /* Address table precomputed with prefetch off and a DCLK of 2 */
132 static const u8 addr_timing[2][5] = {
133 { 0x30, 0x20, 0x20, 0x10, 0x10 },
134 { 0x20, 0x20, 0x10, 0x10, 0x10 }
136 static const u8 data_rec_timing[2][5] = {
137 { 0x6B, 0x56, 0x42, 0x32, 0x31 },
138 { 0x58, 0x44, 0x32, 0x22, 0x21 }
141 iowrite8(0xff, regio + 5);
142 clock = ioread16(regio + 5) & 1;
145 * As with many controllers the address setup time is shared
146 * and must suit both devices if present.
149 addr = addr_timing[clock][pio];
151 /* Hardware constraint */
152 u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
153 if (pair_addr > addr)
157 /* Commence primary programming sequence */
158 opti_write_reg(ap, adev->devno, MISC_REG);
159 opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
160 opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
161 opti_write_reg(ap, addr, MISC_REG);
163 /* Programming sequence complete, override strapping */
164 opti_write_reg(ap, 0x85, CNTRL_REG);
167 static struct scsi_host_template opti_sht = {
168 ATA_PIO_SHT(DRV_NAME),
171 static struct ata_port_operations opti_port_ops = {
172 .inherits = &ata_sff_port_ops,
173 .cable_detect = ata_cable_40wire,
174 .set_piomode = opti_set_piomode,
175 .error_handler = opti_error_handler,
178 static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
180 static const struct ata_port_info info = {
181 .flags = ATA_FLAG_SLAVE_POSS,
183 .port_ops = &opti_port_ops
185 const struct ata_port_info *ppi[] = { &info, NULL };
186 static int printed_version;
188 if (!printed_version++)
189 dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
191 return ata_pci_init_one(dev, ppi, &opti_sht);
194 static const struct pci_device_id opti[] = {
195 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
196 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
201 static struct pci_driver opti_pci_driver = {
204 .probe = opti_init_one,
205 .remove = ata_pci_remove_one,
207 .suspend = ata_pci_device_suspend,
208 .resume = ata_pci_device_resume,
212 static int __init opti_init(void)
214 return pci_register_driver(&opti_pci_driver);
217 static void __exit opti_exit(void)
219 pci_unregister_driver(&opti_pci_driver);
223 MODULE_AUTHOR("Alan Cox");
224 MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
225 MODULE_LICENSE("GPL");
226 MODULE_DEVICE_TABLE(pci, opti);
227 MODULE_VERSION(DRV_VERSION);
229 module_init(opti_init);
230 module_exit(opti_exit);