forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
200 lines
5.2 KiB
200 lines
5.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* pata_opti.c - ATI PATA for new ATA layer |
|
* (C) 2005 Red Hat Inc |
|
* |
|
* 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 <[email protected]>, |
|
* Jan Harkes <[email protected]>, |
|
* Mark Lord <[email protected]> |
|
* 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/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 = ATA_PIO4, |
|
.port_ops = &opti_port_ops |
|
}; |
|
const struct ata_port_info *ppi[] = { &info, NULL }; |
|
|
|
ata_print_version_once(&dev->dev, DRV_VERSION); |
|
|
|
return ata_pci_sff_init_one(dev, ppi, &opti_sht, NULL, 0); |
|
} |
|
|
|
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_SLEEP |
|
.suspend = ata_pci_device_suspend, |
|
.resume = ata_pci_device_resume, |
|
#endif |
|
}; |
|
|
|
module_pci_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);
|
|
|