1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * pata_opti.c - ATI PATA for new ATA layer
4 * (C) 2005 Red Hat Inc
5 *
6 * Based on
7 * linux/drivers/ide/pci/opti621.c Version 0.7 Sept 10, 2002
8 *
9 * Copyright (C) 1996-1998 Linus Torvalds & authors (see below)
10 *
11 * Authors:
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.
16 *
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
20 *
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
24 *
25 */
26
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/pci.h>
30#include <linux/blkdev.h>
31#include <linux/delay.h>
32#include <scsi/scsi_host.h>
33#include <linux/libata.h>
34
35#define DRV_NAME "pata_opti"
36#define DRV_VERSION "0.2.9"
37
38enum {
39 READ_REG = 0, /* index of Read cycle timing register */
40 WRITE_REG = 1, /* index of Write cycle timing register */
41 CNTRL_REG = 3, /* index of Control register */
42 STRAP_REG = 5, /* index of Strap register */
43 MISC_REG = 6 /* index of Miscellaneous register */
44};
45
46/**
47 * opti_pre_reset - probe begin
48 * @link: ATA link
49 * @deadline: deadline jiffies for the operation
50 *
51 * Set up cable type and use generic probe init
52 */
53
54static int opti_pre_reset(struct ata_link *link, unsigned long deadline)
55{
56 struct ata_port *ap = link->ap;
57 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
58 static const struct pci_bits opti_enable_bits[] = {
59 { 0x45, 1, 0x80, 0x00 },
60 { 0x40, 1, 0x08, 0x00 }
61 };
62
63 if (!pci_test_config_bits(pdev, bits: &opti_enable_bits[ap->port_no]))
64 return -ENOENT;
65
66 return ata_sff_prereset(link, deadline);
67}
68
69/**
70 * opti_write_reg - control register setup
71 * @ap: ATA port
72 * @val: value
73 * @reg: control register number
74 *
75 * The Opti uses magic 'trapdoor' register accesses to do configuration
76 * rather than using PCI space as other controllers do. The double inw
77 * on the error register activates configuration mode. We can then write
78 * the control register
79 */
80
81static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
82{
83 void __iomem *regio = ap->ioaddr.cmd_addr;
84
85 /* These 3 unlock the control register access */
86 ioread16(regio + 1);
87 ioread16(regio + 1);
88 iowrite8(3, regio + 2);
89
90 /* Do the I/O */
91 iowrite8(val, regio + reg);
92
93 /* Relock */
94 iowrite8(0x83, regio + 2);
95}
96
97/**
98 * opti_set_piomode - set initial PIO mode data
99 * @ap: ATA interface
100 * @adev: ATA device
101 *
102 * Called to do the PIO mode setup. Timing numbers are taken from
103 * the FreeBSD driver then pre computed to keep the code clean. There
104 * are two tables depending on the hardware clock speed.
105 */
106
107static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
108{
109 struct ata_device *pair = ata_dev_pair(adev);
110 int clock;
111 int pio = adev->pio_mode - XFER_PIO_0;
112 void __iomem *regio = ap->ioaddr.cmd_addr;
113 u8 addr;
114
115 /* Address table precomputed with prefetch off and a DCLK of 2 */
116 static const u8 addr_timing[2][5] = {
117 { 0x30, 0x20, 0x20, 0x10, 0x10 },
118 { 0x20, 0x20, 0x10, 0x10, 0x10 }
119 };
120 static const u8 data_rec_timing[2][5] = {
121 { 0x6B, 0x56, 0x42, 0x32, 0x31 },
122 { 0x58, 0x44, 0x32, 0x22, 0x21 }
123 };
124
125 iowrite8(0xff, regio + 5);
126 clock = ioread16(regio + 5) & 1;
127
128 /*
129 * As with many controllers the address setup time is shared
130 * and must suit both devices if present.
131 */
132
133 addr = addr_timing[clock][pio];
134 if (pair) {
135 /* Hardware constraint */
136 u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
137 if (pair_addr > addr)
138 addr = pair_addr;
139 }
140
141 /* Commence primary programming sequence */
142 opti_write_reg(ap, val: adev->devno, reg: MISC_REG);
143 opti_write_reg(ap, val: data_rec_timing[clock][pio], reg: READ_REG);
144 opti_write_reg(ap, val: data_rec_timing[clock][pio], reg: WRITE_REG);
145 opti_write_reg(ap, val: addr, reg: MISC_REG);
146
147 /* Programming sequence complete, override strapping */
148 opti_write_reg(ap, val: 0x85, reg: CNTRL_REG);
149}
150
151static const struct scsi_host_template opti_sht = {
152 ATA_PIO_SHT(DRV_NAME),
153};
154
155static struct ata_port_operations opti_port_ops = {
156 .inherits = &ata_sff_port_ops,
157 .cable_detect = ata_cable_40wire,
158 .set_piomode = opti_set_piomode,
159 .prereset = opti_pre_reset,
160};
161
162static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
163{
164 static const struct ata_port_info info = {
165 .flags = ATA_FLAG_SLAVE_POSS,
166 .pio_mask = ATA_PIO4,
167 .port_ops = &opti_port_ops
168 };
169 const struct ata_port_info *ppi[] = { &info, NULL };
170
171 ata_print_version_once(&dev->dev, DRV_VERSION);
172
173 return ata_pci_sff_init_one(pdev: dev, ppi, sht: &opti_sht, NULL, hflags: 0);
174}
175
176static const struct pci_device_id opti[] = {
177 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
178 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
179
180 { },
181};
182
183static struct pci_driver opti_pci_driver = {
184 .name = DRV_NAME,
185 .id_table = opti,
186 .probe = opti_init_one,
187 .remove = ata_pci_remove_one,
188#ifdef CONFIG_PM_SLEEP
189 .suspend = ata_pci_device_suspend,
190 .resume = ata_pci_device_resume,
191#endif
192};
193
194module_pci_driver(opti_pci_driver);
195
196MODULE_AUTHOR("Alan Cox");
197MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
198MODULE_LICENSE("GPL");
199MODULE_DEVICE_TABLE(pci, opti);
200MODULE_VERSION(DRV_VERSION);
201

source code of linux/drivers/ata/pata_opti.c