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drivers/ata/pata_opti.c
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// SPDX-License-Identifier: GPL-2.0-only |
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/* * pata_opti.c - ATI PATA for new ATA layer * (C) 2005 Red Hat Inc |
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* * 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> |
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#include <linux/blkdev.h> #include <linux/delay.h> #include <scsi/scsi_host.h> #include <linux/libata.h> #define DRV_NAME "pata_opti" |
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#define DRV_VERSION "0.2.9" |
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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 |
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* @link: ATA link |
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* @deadline: deadline jiffies for the operation |
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* * Set up cable type and use generic probe init */ |
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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); static const struct pci_bits opti_enable_bits[] = { { 0x45, 1, 0x80, 0x00 }, { 0x40, 1, 0x08, 0x00 } }; |
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if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no])) return -ENOENT; |
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return ata_sff_prereset(link, deadline); |
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} /** |
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* 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) { |
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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); ioread16(regio + 1); 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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/** * 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; |
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void __iomem *regio = ap->ioaddr.cmd_addr; |
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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 } }; |
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iowrite8(0xff, regio + 5); clock = ioread16(regio + 5) & 1; |
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/* * 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 = { |
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ATA_PIO_SHT(DRV_NAME), |
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}; static struct ata_port_operations opti_port_ops = { |
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.inherits = &ata_sff_port_ops, .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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}; static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id) { |
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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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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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} static const struct pci_device_id opti[] = { |
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{ PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 }, { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 }, { }, |
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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, .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, .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"); MODULE_DESCRIPTION("low-level driver for Opti 621/621X"); MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(pci, opti); MODULE_VERSION(DRV_VERSION); |