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 "0.2.7"
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]))
65 ap->cbl = ATA_CBL_PATA40;
66 return ata_std_prereset(ap);
70 * opti_probe_reset - probe reset
73 * Perform the ATA probe and bus reset sequence plus specific handling
74 * for this hardware. The Opti needs little handling - we have no UDMA66
75 * capability that needs cable detection. All we must do is check the port
79 static void opti_error_handler(struct ata_port *ap)
81 ata_bmdma_drive_eh(ap, opti_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
85 * opti_write_reg - control register setup
88 * @reg: control register number
90 * The Opti uses magic 'trapdoor' register accesses to do configuration
91 * rather than using PCI space as other controllers do. The double inw
92 * on the error register activates configuration mode. We can then write
93 * the control register
96 static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
98 void __iomem *regio = ap->ioaddr.cmd_addr;
100 /* These 3 unlock the control register access */
103 iowrite8(3, regio + 2);
106 iowrite8(val, regio + reg);
109 iowrite8(0x83, regio + 2);
113 * opti_set_piomode - set initial PIO mode data
117 * Called to do the PIO mode setup. Timing numbers are taken from
118 * the FreeBSD driver then pre computed to keep the code clean. There
119 * are two tables depending on the hardware clock speed.
122 static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
124 struct ata_device *pair = ata_dev_pair(adev);
126 int pio = adev->pio_mode - XFER_PIO_0;
127 void __iomem *regio = ap->ioaddr.cmd_addr;
130 /* Address table precomputed with prefetch off and a DCLK of 2 */
131 static const u8 addr_timing[2][5] = {
132 { 0x30, 0x20, 0x20, 0x10, 0x10 },
133 { 0x20, 0x20, 0x10, 0x10, 0x10 }
135 static const u8 data_rec_timing[2][5] = {
136 { 0x6B, 0x56, 0x42, 0x32, 0x31 },
137 { 0x58, 0x44, 0x32, 0x22, 0x21 }
140 iowrite8(0xff, regio + 5);
141 clock = ioread16(regio + 5) & 1;
144 * As with many controllers the address setup time is shared
145 * and must suit both devices if present.
148 addr = addr_timing[clock][pio];
150 /* Hardware constraint */
151 u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
152 if (pair_addr > addr)
156 /* Commence primary programming sequence */
157 opti_write_reg(ap, adev->devno, MISC_REG);
158 opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
159 opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
160 opti_write_reg(ap, addr, MISC_REG);
162 /* Programming sequence complete, override strapping */
163 opti_write_reg(ap, 0x85, CNTRL_REG);
166 static struct scsi_host_template opti_sht = {
167 .module = THIS_MODULE,
169 .ioctl = ata_scsi_ioctl,
170 .queuecommand = ata_scsi_queuecmd,
171 .can_queue = ATA_DEF_QUEUE,
172 .this_id = ATA_SHT_THIS_ID,
173 .sg_tablesize = LIBATA_MAX_PRD,
174 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
175 .emulated = ATA_SHT_EMULATED,
176 .use_clustering = ATA_SHT_USE_CLUSTERING,
177 .proc_name = DRV_NAME,
178 .dma_boundary = ATA_DMA_BOUNDARY,
179 .slave_configure = ata_scsi_slave_config,
180 .slave_destroy = ata_scsi_slave_destroy,
181 .bios_param = ata_std_bios_param,
182 .resume = ata_scsi_device_resume,
183 .suspend = ata_scsi_device_suspend,
186 static struct ata_port_operations opti_port_ops = {
187 .port_disable = ata_port_disable,
188 .set_piomode = opti_set_piomode,
189 .tf_load = ata_tf_load,
190 .tf_read = ata_tf_read,
191 .check_status = ata_check_status,
192 .exec_command = ata_exec_command,
193 .dev_select = ata_std_dev_select,
195 .freeze = ata_bmdma_freeze,
196 .thaw = ata_bmdma_thaw,
197 .error_handler = opti_error_handler,
198 .post_internal_cmd = ata_bmdma_post_internal_cmd,
200 .bmdma_setup = ata_bmdma_setup,
201 .bmdma_start = ata_bmdma_start,
202 .bmdma_stop = ata_bmdma_stop,
203 .bmdma_status = ata_bmdma_status,
205 .qc_prep = ata_qc_prep,
206 .qc_issue = ata_qc_issue_prot,
208 .data_xfer = ata_data_xfer,
210 .irq_handler = ata_interrupt,
211 .irq_clear = ata_bmdma_irq_clear,
212 .irq_on = ata_irq_on,
213 .irq_ack = ata_irq_ack,
215 .port_start = ata_port_start,
218 static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
220 static struct ata_port_info info = {
222 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
224 .port_ops = &opti_port_ops
226 static struct ata_port_info *port_info[2] = { &info, &info };
227 static int printed_version;
229 if (!printed_version++)
230 dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
232 return ata_pci_init_one(dev, port_info, 2);
235 static const struct pci_device_id opti[] = {
236 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
237 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
242 static struct pci_driver opti_pci_driver = {
245 .probe = opti_init_one,
246 .remove = ata_pci_remove_one,
247 .suspend = ata_pci_device_suspend,
248 .resume = ata_pci_device_resume,
251 static int __init opti_init(void)
253 return pci_register_driver(&opti_pci_driver);
256 static void __exit opti_exit(void)
258 pci_unregister_driver(&opti_pci_driver);
262 MODULE_AUTHOR("Alan Cox");
263 MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
264 MODULE_LICENSE("GPL");
265 MODULE_DEVICE_TABLE(pci, opti);
266 MODULE_VERSION(DRV_VERSION);
268 module_init(opti_init);
269 module_exit(opti_exit);