1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 *  Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
  4 *  Copyright (C) 2006-2007 MontaVista Software, Inc. <source@mvista.com>
  5 *
  6 * This is a look-alike variation of the ICH0 PIIX4 Ultra-66,
  7 * but this keeps the ISA-Bridge and slots alive.
  8 *
  9 */
 10
 11#include <linux/types.h>
 12#include <linux/module.h>
 13#include <linux/kernel.h>
 14#include <linux/pci.h>
 15#include <linux/ide.h>
 16#include <linux/init.h>
 17
 18#define DRV_NAME "slc90e66"
 19
 20static DEFINE_SPINLOCK(slc90e66_lock);
 21
 22static void slc90e66_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 23{
 24	struct pci_dev *dev	= to_pci_dev(hwif->dev);
 25	int is_slave		= drive->dn & 1;
 26	int master_port		= hwif->channel ? 0x42 : 0x40;
 27	int slave_port		= 0x44;
 28	unsigned long flags;
 29	u16 master_data;
 30	u8 slave_data;
 31	int control = 0;
 32	const u8 pio = drive->pio_mode - XFER_PIO_0;
 33
 34				     /* ISP  RTC */
 35	static const u8 timings[][2] = {
 36					{ 0, 0 },
 37					{ 0, 0 },
 38					{ 1, 0 },
 39					{ 2, 1 },
 40					{ 2, 3 }, };
 41
 42	spin_lock_irqsave(&slc90e66_lock, flags);
 43	pci_read_config_word(dev, master_port, &master_data);
 44
 45	if (pio > 1)
 46		control |= 1;	/* Programmable timing on */
 47	if (drive->media == ide_disk)
 48		control |= 4;	/* Prefetch, post write */
 49	if (ide_pio_need_iordy(drive, pio))
 50		control |= 2;	/* IORDY */
 51	if (is_slave) {
 52		master_data |=  0x4000;
 53		master_data &= ~0x0070;
 54		if (pio > 1) {
 55			/* Set PPE, IE and TIME */
 56			master_data |= control << 4;
 57		}
 58		pci_read_config_byte(dev, slave_port, &slave_data);
 59		slave_data &= hwif->channel ? 0x0f : 0xf0;
 60		slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) <<
 61			       (hwif->channel ? 4 : 0);
 62	} else {
 63		master_data &= ~0x3307;
 64		if (pio > 1) {
 65			/* enable PPE, IE and TIME */
 66			master_data |= control;
 67		}
 68		master_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
 69	}
 70	pci_write_config_word(dev, master_port, master_data);
 71	if (is_slave)
 72		pci_write_config_byte(dev, slave_port, slave_data);
 73	spin_unlock_irqrestore(&slc90e66_lock, flags);
 74}
 75
 76static void slc90e66_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 77{
 78	struct pci_dev *dev	= to_pci_dev(hwif->dev);
 79	u8 maslave		= hwif->channel ? 0x42 : 0x40;
 80	int sitre = 0, a_speed	= 7 << (drive->dn * 4);
 81	int u_speed = 0, u_flag = 1 << drive->dn;
 82	u16			reg4042, reg44, reg48, reg4a;
 83	const u8 speed		= drive->dma_mode;
 84
 85	pci_read_config_word(dev, maslave, &reg4042);
 86	sitre = (reg4042 & 0x4000) ? 1 : 0;
 87	pci_read_config_word(dev, 0x44, &reg44);
 88	pci_read_config_word(dev, 0x48, &reg48);
 89	pci_read_config_word(dev, 0x4a, &reg4a);
 90
 91	if (speed >= XFER_UDMA_0) {
 92		u_speed = (speed - XFER_UDMA_0) << (drive->dn * 4);
 93
 94		if (!(reg48 & u_flag))
 95			pci_write_config_word(dev, 0x48, reg48|u_flag);
 96		if ((reg4a & a_speed) != u_speed) {
 97			pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
 98			pci_read_config_word(dev, 0x4a, &reg4a);
 99			pci_write_config_word(dev, 0x4a, reg4a|u_speed);
100		}
101	} else {
102		const u8 mwdma_to_pio[] = { 0, 3, 4 };
103
104		if (reg48 & u_flag)
105			pci_write_config_word(dev, 0x48, reg48 & ~u_flag);
106		if (reg4a & a_speed)
107			pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
108
109		if (speed >= XFER_MW_DMA_0)
110			drive->pio_mode =
111				mwdma_to_pio[speed - XFER_MW_DMA_0] + XFER_PIO_0;
112		else
113			drive->pio_mode = XFER_PIO_2; /* for SWDMA2 */
114
115		slc90e66_set_pio_mode(hwif, drive);
116	}
117}
118
119static u8 slc90e66_cable_detect(ide_hwif_t *hwif)
120{
121	struct pci_dev *dev = to_pci_dev(hwif->dev);
122	u8 reg47 = 0, mask = hwif->channel ? 0x01 : 0x02;
123
124	pci_read_config_byte(dev, 0x47, &reg47);
125
126	/* bit[0(1)]: 0:80, 1:40 */
127	return (reg47 & mask) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
128}
129
130static const struct ide_port_ops slc90e66_port_ops = {
131	.set_pio_mode		= slc90e66_set_pio_mode,
132	.set_dma_mode		= slc90e66_set_dma_mode,
133	.cable_detect		= slc90e66_cable_detect,
134};
135
136static const struct ide_port_info slc90e66_chipset = {
137	.name		= DRV_NAME,
138	.enablebits	= { {0x41, 0x80, 0x80}, {0x43, 0x80, 0x80} },
139	.port_ops	= &slc90e66_port_ops,
140	.pio_mask	= ATA_PIO4,
141	.swdma_mask	= ATA_SWDMA2_ONLY,
142	.mwdma_mask	= ATA_MWDMA12_ONLY,
143	.udma_mask	= ATA_UDMA4,
144};
145
146static int slc90e66_init_one(struct pci_dev *dev,
147			     const struct pci_device_id *id)
148{
149	return ide_pci_init_one(dev, &slc90e66_chipset, NULL);
150}
151
152static const struct pci_device_id slc90e66_pci_tbl[] = {
153	{ PCI_VDEVICE(EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_1), 0 },
154	{ 0, },
155};
156MODULE_DEVICE_TABLE(pci, slc90e66_pci_tbl);
157
158static struct pci_driver slc90e66_pci_driver = {
159	.name		= "SLC90e66_IDE",
160	.id_table	= slc90e66_pci_tbl,
161	.probe		= slc90e66_init_one,
162	.remove		= ide_pci_remove,
163	.suspend	= ide_pci_suspend,
164	.resume		= ide_pci_resume,
165};
166
167static int __init slc90e66_ide_init(void)
168{
169	return ide_pci_register_driver(&slc90e66_pci_driver);
170}
171
172static void __exit slc90e66_ide_exit(void)
173{
174	pci_unregister_driver(&slc90e66_pci_driver);
175}
176
177module_init(slc90e66_ide_init);
178module_exit(slc90e66_ide_exit);
179
180MODULE_AUTHOR("Andre Hedrick");
181MODULE_DESCRIPTION("PCI driver module for SLC90E66 IDE");
182MODULE_LICENSE("GPL");