200 lines
5.2 KiB
C
200 lines
5.2 KiB
C
/*
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* pata_opti.c - ATI PATA for new ATA layer
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* (C) 2005 Red Hat Inc
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*
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* Based on
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* linux/drivers/ide/pci/opti621.c Version 0.7 Sept 10, 2002
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*
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* Copyright (C) 1996-1998 Linus Torvalds & authors (see below)
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*
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* Authors:
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* Jaromir Koutek <miri@punknet.cz>,
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* Jan Harkes <jaharkes@cwi.nl>,
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* Mark Lord <mlord@pobox.com>
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* Some parts of code are from ali14xx.c and from rz1000.c.
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*
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* Also consulted the FreeBSD prototype driver by Kevin Day to try
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* and resolve some confusions. Further documentation can be found in
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* Ralf Brown's interrupt list
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*
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* If you have other variants of the Opti range (Viper/Vendetta) please
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* try this driver with those PCI idents and report back. For the later
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* chips see the pata_optidma driver
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <scsi/scsi_host.h>
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#include <linux/libata.h>
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#define DRV_NAME "pata_opti"
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#define DRV_VERSION "0.2.9"
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enum {
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READ_REG = 0, /* index of Read cycle timing register */
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WRITE_REG = 1, /* index of Write cycle timing register */
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CNTRL_REG = 3, /* index of Control register */
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STRAP_REG = 5, /* index of Strap register */
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MISC_REG = 6 /* index of Miscellaneous register */
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};
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/**
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* opti_pre_reset - probe begin
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* @link: ATA link
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* @deadline: deadline jiffies for the operation
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*
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* Set up cable type and use generic probe init
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*/
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static int opti_pre_reset(struct ata_link *link, unsigned long deadline)
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{
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struct ata_port *ap = link->ap;
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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static const struct pci_bits opti_enable_bits[] = {
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{ 0x45, 1, 0x80, 0x00 },
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{ 0x40, 1, 0x08, 0x00 }
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};
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if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no]))
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return -ENOENT;
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return ata_sff_prereset(link, deadline);
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}
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/**
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* opti_write_reg - control register setup
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* @ap: ATA port
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* @value: value
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* @reg: control register number
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*
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* The Opti uses magic 'trapdoor' register accesses to do configuration
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* rather than using PCI space as other controllers do. The double inw
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* on the error register activates configuration mode. We can then write
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* the control register
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*/
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static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
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{
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void __iomem *regio = ap->ioaddr.cmd_addr;
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/* These 3 unlock the control register access */
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ioread16(regio + 1);
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ioread16(regio + 1);
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iowrite8(3, regio + 2);
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/* Do the I/O */
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iowrite8(val, regio + reg);
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/* Relock */
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iowrite8(0x83, regio + 2);
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}
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/**
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* opti_set_piomode - set initial PIO mode data
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* @ap: ATA interface
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* @adev: ATA device
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*
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* Called to do the PIO mode setup. Timing numbers are taken from
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* the FreeBSD driver then pre computed to keep the code clean. There
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* are two tables depending on the hardware clock speed.
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*/
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static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
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{
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struct ata_device *pair = ata_dev_pair(adev);
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int clock;
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int pio = adev->pio_mode - XFER_PIO_0;
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void __iomem *regio = ap->ioaddr.cmd_addr;
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u8 addr;
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/* Address table precomputed with prefetch off and a DCLK of 2 */
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static const u8 addr_timing[2][5] = {
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{ 0x30, 0x20, 0x20, 0x10, 0x10 },
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{ 0x20, 0x20, 0x10, 0x10, 0x10 }
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};
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static const u8 data_rec_timing[2][5] = {
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{ 0x6B, 0x56, 0x42, 0x32, 0x31 },
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{ 0x58, 0x44, 0x32, 0x22, 0x21 }
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};
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iowrite8(0xff, regio + 5);
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clock = ioread16(regio + 5) & 1;
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/*
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* As with many controllers the address setup time is shared
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* and must suit both devices if present.
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*/
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addr = addr_timing[clock][pio];
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if (pair) {
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/* Hardware constraint */
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u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
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if (pair_addr > addr)
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addr = pair_addr;
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}
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/* Commence primary programming sequence */
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opti_write_reg(ap, adev->devno, MISC_REG);
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opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
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opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
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opti_write_reg(ap, addr, MISC_REG);
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/* Programming sequence complete, override strapping */
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opti_write_reg(ap, 0x85, CNTRL_REG);
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}
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static struct scsi_host_template opti_sht = {
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ATA_PIO_SHT(DRV_NAME),
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};
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static struct ata_port_operations opti_port_ops = {
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.inherits = &ata_sff_port_ops,
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.cable_detect = ata_cable_40wire,
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.set_piomode = opti_set_piomode,
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.prereset = opti_pre_reset,
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};
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static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
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{
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static const struct ata_port_info info = {
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.flags = ATA_FLAG_SLAVE_POSS,
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.pio_mask = ATA_PIO4,
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.port_ops = &opti_port_ops
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};
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const struct ata_port_info *ppi[] = { &info, NULL };
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ata_print_version_once(&dev->dev, DRV_VERSION);
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return ata_pci_sff_init_one(dev, ppi, &opti_sht, NULL, 0);
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}
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static const struct pci_device_id opti[] = {
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{ PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
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{ PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
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{ },
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};
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static struct pci_driver opti_pci_driver = {
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.name = DRV_NAME,
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.id_table = opti,
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.probe = opti_init_one,
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.remove = ata_pci_remove_one,
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#ifdef CONFIG_PM_SLEEP
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.suspend = ata_pci_device_suspend,
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.resume = ata_pci_device_resume,
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#endif
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};
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module_pci_driver(opti_pci_driver);
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MODULE_AUTHOR("Alan Cox");
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MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, opti);
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MODULE_VERSION(DRV_VERSION);
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