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 "0.2.4"
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
51 * Set up cable type and use generic probe init
54 static int opti_pre_reset(struct ata_port *ap)
56 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
57 static const struct pci_bits opti_enable_bits[] = {
58 { 0x45, 1, 0x80, 0x00 },
59 { 0x40, 1, 0x08, 0x00 }
62 if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no])) {
64 printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
67 ap->cbl = ATA_CBL_PATA40;
68 return ata_std_prereset(ap);
72 * opti_probe_reset - probe reset
75 * Perform the ATA probe and bus reset sequence plus specific handling
76 * for this hardware. The Opti needs little handling - we have no UDMA66
77 * capability that needs cable detection. All we must do is check the port
81 static void opti_error_handler(struct ata_port *ap)
83 ata_bmdma_drive_eh(ap, opti_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
87 * opti_write_reg - control register setup
90 * @reg: control register number
92 * The Opti uses magic 'trapdoor' register accesses to do configuration
93 * rather than using PCI space as other controllers do. The double inw
94 * on the error register activates configuration mode. We can then write
95 * the control register
98 static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
100 unsigned long regio = ap->ioaddr.cmd_addr;
102 /* These 3 unlock the control register access */
108 outb(val, regio + reg);
111 outb(0x83, regio + 2);
116 * opti_read_reg - control register read
118 * @reg: control register number
120 * The Opti uses magic 'trapdoor' register accesses to do configuration
121 * rather than using PCI space as other controllers do. The double inw
122 * on the error register activates configuration mode. We can then read
123 * the control register
126 static u8 opti_read_reg(struct ata_port *ap, int reg)
128 unsigned long regio = ap->ioaddr.cmd_addr;
133 ret = inb(regio + reg);
134 outb(0x83, regio + 2);
139 * opti_set_piomode - set initial PIO mode data
143 * Called to do the PIO mode setup. Timing numbers are taken from
144 * the FreeBSD driver then pre computed to keep the code clean. There
145 * are two tables depending on the hardware clock speed.
148 static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
150 struct ata_device *pair = ata_dev_pair(adev);
152 int pio = adev->pio_mode - XFER_PIO_0;
153 unsigned long regio = ap->ioaddr.cmd_addr;
156 /* Address table precomputed with prefetch off and a DCLK of 2 */
157 static const u8 addr_timing[2][5] = {
158 { 0x30, 0x20, 0x20, 0x10, 0x10 },
159 { 0x20, 0x20, 0x10, 0x10, 0x10 }
161 static const u8 data_rec_timing[2][5] = {
162 { 0x6B, 0x56, 0x42, 0x32, 0x31 },
163 { 0x58, 0x44, 0x32, 0x22, 0x21 }
166 outb(0xff, regio + 5);
167 clock = inw(regio + 5) & 1;
170 * As with many controllers the address setup time is shared
171 * and must suit both devices if present.
174 addr = addr_timing[clock][pio];
176 /* Hardware constraint */
177 u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
178 if (pair_addr > addr)
182 /* Commence primary programming sequence */
183 opti_write_reg(ap, adev->devno, MISC_REG);
184 opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
185 opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
186 opti_write_reg(ap, addr, MISC_REG);
188 /* Programming sequence complete, override strapping */
189 opti_write_reg(ap, 0x85, CNTRL_REG);
192 static struct scsi_host_template opti_sht = {
193 .module = THIS_MODULE,
195 .ioctl = ata_scsi_ioctl,
196 .queuecommand = ata_scsi_queuecmd,
197 .can_queue = ATA_DEF_QUEUE,
198 .this_id = ATA_SHT_THIS_ID,
199 .sg_tablesize = LIBATA_MAX_PRD,
200 .max_sectors = ATA_MAX_SECTORS,
201 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
202 .emulated = ATA_SHT_EMULATED,
203 .use_clustering = ATA_SHT_USE_CLUSTERING,
204 .proc_name = DRV_NAME,
205 .dma_boundary = ATA_DMA_BOUNDARY,
206 .slave_configure = ata_scsi_slave_config,
207 .bios_param = ata_std_bios_param,
210 static struct ata_port_operations opti_port_ops = {
211 .port_disable = ata_port_disable,
212 .set_piomode = opti_set_piomode,
213 /* .set_dmamode = opti_set_dmamode, */
214 .tf_load = ata_tf_load,
215 .tf_read = ata_tf_read,
216 .check_status = ata_check_status,
217 .exec_command = ata_exec_command,
218 .dev_select = ata_std_dev_select,
220 .freeze = ata_bmdma_freeze,
221 .thaw = ata_bmdma_thaw,
222 .error_handler = opti_error_handler,
223 .post_internal_cmd = ata_bmdma_post_internal_cmd,
225 .bmdma_setup = ata_bmdma_setup,
226 .bmdma_start = ata_bmdma_start,
227 .bmdma_stop = ata_bmdma_stop,
228 .bmdma_status = ata_bmdma_status,
230 .qc_prep = ata_qc_prep,
231 .qc_issue = ata_qc_issue_prot,
232 .eng_timeout = ata_eng_timeout,
233 .data_xfer = ata_pio_data_xfer,
235 .irq_handler = ata_interrupt,
236 .irq_clear = ata_bmdma_irq_clear,
238 .port_start = ata_port_start,
239 .port_stop = ata_port_stop,
240 .host_stop = ata_host_stop
243 static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
245 static struct ata_port_info info = {
247 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
249 .port_ops = &opti_port_ops
251 static struct ata_port_info *port_info[2] = { &info, &info };
252 static int printed_version;
254 if (!printed_version++)
255 dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
257 return ata_pci_init_one(dev, port_info, 2);
260 static const struct pci_device_id opti[] = {
261 { PCI_VENDOR_ID_OPTI, PCI_DEVICE_ID_OPTI_82C621, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
262 { PCI_VENDOR_ID_OPTI, PCI_DEVICE_ID_OPTI_82C825, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
266 static struct pci_driver opti_pci_driver = {
269 .probe = opti_init_one,
270 .remove = ata_pci_remove_one
273 static int __init opti_init(void)
275 return pci_register_driver(&opti_pci_driver);
279 static void __exit opti_exit(void)
281 pci_unregister_driver(&opti_pci_driver);
285 MODULE_AUTHOR("Alan Cox");
286 MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
287 MODULE_LICENSE("GPL");
288 MODULE_DEVICE_TABLE(pci, opti);
289 MODULE_VERSION(DRV_VERSION);
291 module_init(opti_init);
292 module_exit(opti_exit);