| /* |
| * pata_opti.c - ATI PATA for new ATA layer |
| * (C) 2005 Red Hat Inc |
| * Alan Cox <alan@redhat.com> |
| * |
| * Based on |
| * linux/drivers/ide/pci/opti621.c Version 0.7 Sept 10, 2002 |
| * |
| * Copyright (C) 1996-1998 Linus Torvalds & authors (see below) |
| * |
| * Authors: |
| * Jaromir Koutek <miri@punknet.cz>, |
| * Jan Harkes <jaharkes@cwi.nl>, |
| * Mark Lord <mlord@pobox.com> |
| * Some parts of code are from ali14xx.c and from rz1000.c. |
| * |
| * Also consulted the FreeBSD prototype driver by Kevin Day to try |
| * and resolve some confusions. Further documentation can be found in |
| * Ralf Brown's interrupt list |
| * |
| * If you have other variants of the Opti range (Viper/Vendetta) please |
| * try this driver with those PCI idents and report back. For the later |
| * chips see the pata_optidma driver |
| * |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/pci.h> |
| #include <linux/init.h> |
| #include <linux/blkdev.h> |
| #include <linux/delay.h> |
| #include <scsi/scsi_host.h> |
| #include <linux/libata.h> |
| |
| #define DRV_NAME "pata_opti" |
| #define DRV_VERSION "0.2.9" |
| |
| enum { |
| READ_REG = 0, /* index of Read cycle timing register */ |
| WRITE_REG = 1, /* index of Write cycle timing register */ |
| CNTRL_REG = 3, /* index of Control register */ |
| STRAP_REG = 5, /* index of Strap register */ |
| MISC_REG = 6 /* index of Miscellaneous register */ |
| }; |
| |
| /** |
| * opti_pre_reset - probe begin |
| * @link: ATA link |
| * @deadline: deadline jiffies for the operation |
| * |
| * Set up cable type and use generic probe init |
| */ |
| |
| static int opti_pre_reset(struct ata_link *link, unsigned long deadline) |
| { |
| struct ata_port *ap = link->ap; |
| struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
| static const struct pci_bits opti_enable_bits[] = { |
| { 0x45, 1, 0x80, 0x00 }, |
| { 0x40, 1, 0x08, 0x00 } |
| }; |
| |
| if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no])) |
| return -ENOENT; |
| |
| return ata_sff_prereset(link, deadline); |
| } |
| |
| /** |
| * opti_write_reg - control register setup |
| * @ap: ATA port |
| * @value: value |
| * @reg: control register number |
| * |
| * The Opti uses magic 'trapdoor' register accesses to do configuration |
| * rather than using PCI space as other controllers do. The double inw |
| * on the error register activates configuration mode. We can then write |
| * the control register |
| */ |
| |
| static void opti_write_reg(struct ata_port *ap, u8 val, int reg) |
| { |
| void __iomem *regio = ap->ioaddr.cmd_addr; |
| |
| /* These 3 unlock the control register access */ |
| ioread16(regio + 1); |
| ioread16(regio + 1); |
| iowrite8(3, regio + 2); |
| |
| /* Do the I/O */ |
| iowrite8(val, regio + reg); |
| |
| /* Relock */ |
| iowrite8(0x83, regio + 2); |
| } |
| |
| /** |
| * opti_set_piomode - set initial PIO mode data |
| * @ap: ATA interface |
| * @adev: ATA device |
| * |
| * Called to do the PIO mode setup. Timing numbers are taken from |
| * the FreeBSD driver then pre computed to keep the code clean. There |
| * are two tables depending on the hardware clock speed. |
| */ |
| |
| static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev) |
| { |
| struct ata_device *pair = ata_dev_pair(adev); |
| int clock; |
| int pio = adev->pio_mode - XFER_PIO_0; |
| void __iomem *regio = ap->ioaddr.cmd_addr; |
| u8 addr; |
| |
| /* Address table precomputed with prefetch off and a DCLK of 2 */ |
| static const u8 addr_timing[2][5] = { |
| { 0x30, 0x20, 0x20, 0x10, 0x10 }, |
| { 0x20, 0x20, 0x10, 0x10, 0x10 } |
| }; |
| static const u8 data_rec_timing[2][5] = { |
| { 0x6B, 0x56, 0x42, 0x32, 0x31 }, |
| { 0x58, 0x44, 0x32, 0x22, 0x21 } |
| }; |
| |
| iowrite8(0xff, regio + 5); |
| clock = ioread16(regio + 5) & 1; |
| |
| /* |
| * As with many controllers the address setup time is shared |
| * and must suit both devices if present. |
| */ |
| |
| addr = addr_timing[clock][pio]; |
| if (pair) { |
| /* Hardware constraint */ |
| u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0]; |
| if (pair_addr > addr) |
| addr = pair_addr; |
| } |
| |
| /* Commence primary programming sequence */ |
| opti_write_reg(ap, adev->devno, MISC_REG); |
| opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG); |
| opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG); |
| opti_write_reg(ap, addr, MISC_REG); |
| |
| /* Programming sequence complete, override strapping */ |
| opti_write_reg(ap, 0x85, CNTRL_REG); |
| } |
| |
| static struct scsi_host_template opti_sht = { |
| ATA_PIO_SHT(DRV_NAME), |
| }; |
| |
| static struct ata_port_operations opti_port_ops = { |
| .inherits = &ata_sff_port_ops, |
| .cable_detect = ata_cable_40wire, |
| .set_piomode = opti_set_piomode, |
| .prereset = opti_pre_reset, |
| }; |
| |
| static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id) |
| { |
| static const struct ata_port_info info = { |
| .flags = ATA_FLAG_SLAVE_POSS, |
| .pio_mask = 0x1f, |
| .port_ops = &opti_port_ops |
| }; |
| const struct ata_port_info *ppi[] = { &info, NULL }; |
| static int printed_version; |
| |
| if (!printed_version++) |
| dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n"); |
| |
| return ata_pci_sff_init_one(dev, ppi, &opti_sht, NULL); |
| } |
| |
| static const struct pci_device_id opti[] = { |
| { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 }, |
| { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 }, |
| |
| { }, |
| }; |
| |
| static struct pci_driver opti_pci_driver = { |
| .name = DRV_NAME, |
| .id_table = opti, |
| .probe = opti_init_one, |
| .remove = ata_pci_remove_one, |
| #ifdef CONFIG_PM |
| .suspend = ata_pci_device_suspend, |
| .resume = ata_pci_device_resume, |
| #endif |
| }; |
| |
| static int __init opti_init(void) |
| { |
| return pci_register_driver(&opti_pci_driver); |
| } |
| |
| static void __exit opti_exit(void) |
| { |
| pci_unregister_driver(&opti_pci_driver); |
| } |
| |
| |
| MODULE_AUTHOR("Alan Cox"); |
| MODULE_DESCRIPTION("low-level driver for Opti 621/621X"); |
| MODULE_LICENSE("GPL"); |
| MODULE_DEVICE_TABLE(pci, opti); |
| MODULE_VERSION(DRV_VERSION); |
| |
| module_init(opti_init); |
| module_exit(opti_exit); |