1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * pata_cypress.c 	- Cypress PATA for new ATA layer
4 *			  (C) 2006 Red Hat Inc
5 *			  Alan Cox
6 *
7 * Based heavily on
8 * linux/drivers/ide/pci/cy82c693.c		Version 0.40	Sep. 10, 2002
9 *
10 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/pci.h>
15#include <linux/blkdev.h>
16#include <linux/delay.h>
17#include <scsi/scsi_host.h>
18#include <linux/libata.h>
19
20#define DRV_NAME "pata_cypress"
21#define DRV_VERSION "0.1.5"
22
23/* here are the offset definitions for the registers */
24
25enum {
26	CY82_IDE_CMDREG		= 0x04,
27	CY82_IDE_ADDRSETUP	= 0x48,
28	CY82_IDE_MASTER_IOR	= 0x4C,
29	CY82_IDE_MASTER_IOW	= 0x4D,
30	CY82_IDE_SLAVE_IOR	= 0x4E,
31	CY82_IDE_SLAVE_IOW	= 0x4F,
32	CY82_IDE_MASTER_8BIT	= 0x50,
33	CY82_IDE_SLAVE_8BIT	= 0x51,
34
35	CY82_INDEX_PORT		= 0x22,
36	CY82_DATA_PORT		= 0x23,
37
38	CY82_INDEX_CTRLREG1	= 0x01,
39	CY82_INDEX_CHANNEL0	= 0x30,
40	CY82_INDEX_CHANNEL1	= 0x31,
41	CY82_INDEX_TIMEOUT	= 0x32
42};
43
44/**
45 *	cy82c693_set_piomode	-	set initial PIO mode data
46 *	@ap: ATA interface
47 *	@adev: ATA device
48 *
49 *	Called to do the PIO mode setup.
50 */
51
52static void cy82c693_set_piomode(struct ata_port *ap, struct ata_device *adev)
53{
54	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
55	struct ata_timing t;
56	const unsigned long T = 1000000 / 33;
57	short time_16, time_8;
58	u32 addr;
59
60	if (ata_timing_compute(adev, adev->pio_mode, &t, T, 1) < 0) {
61		printk(KERN_ERR DRV_NAME ": mome computation failed.\n");
62		return;
63	}
64
65	time_16 = clamp_val(t.recover - 1, 0, 15) |
66		  (clamp_val(t.active - 1, 0, 15) << 4);
67	time_8 = clamp_val(t.act8b - 1, 0, 15) |
68		 (clamp_val(t.rec8b - 1, 0, 15) << 4);
69
70	if (adev->devno == 0) {
71		pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
72
73		addr &= ~0x0F;	/* Mask bits */
74		addr |= clamp_val(t.setup - 1, 0, 15);
75
76		pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
77		pci_write_config_byte(pdev, CY82_IDE_MASTER_IOR, time_16);
78		pci_write_config_byte(pdev, CY82_IDE_MASTER_IOW, time_16);
79		pci_write_config_byte(pdev, CY82_IDE_MASTER_8BIT, time_8);
80	} else {
81		pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
82
83		addr &= ~0xF0;	/* Mask bits */
84		addr |= (clamp_val(t.setup - 1, 0, 15) << 4);
85
86		pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
87		pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOR, time_16);
88		pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOW, time_16);
89		pci_write_config_byte(pdev, CY82_IDE_SLAVE_8BIT, time_8);
90	}
91}
92
93/**
94 *	cy82c693_set_dmamode	-	set initial DMA mode data
95 *	@ap: ATA interface
96 *	@adev: ATA device
97 *
98 *	Called to do the DMA mode setup.
99 */
100
101static void cy82c693_set_dmamode(struct ata_port *ap, struct ata_device *adev)
102{
103	int reg = CY82_INDEX_CHANNEL0 + ap->port_no;
104
105	/* Be afraid, be very afraid. Magic registers  in low I/O space */
106	outb(reg, 0x22);
107	outb(adev->dma_mode - XFER_MW_DMA_0, 0x23);
108
109	/* 0x50 gives the best behaviour on the Alpha's using this chip */
110	outb(CY82_INDEX_TIMEOUT, 0x22);
111	outb(0x50, 0x23);
112}
113
114static struct scsi_host_template cy82c693_sht = {
115	ATA_BMDMA_SHT(DRV_NAME),
116};
117
118static struct ata_port_operations cy82c693_port_ops = {
119	.inherits	= &ata_bmdma_port_ops,
120	.cable_detect	= ata_cable_40wire,
121	.set_piomode	= cy82c693_set_piomode,
122	.set_dmamode	= cy82c693_set_dmamode,
123};
124
125static int cy82c693_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
126{
127	static const struct ata_port_info info = {
128		.flags = ATA_FLAG_SLAVE_POSS,
129		.pio_mask = ATA_PIO4,
130		.mwdma_mask = ATA_MWDMA2,
131		.port_ops = &cy82c693_port_ops
132	};
133	const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
134
135	/* Devfn 1 is the ATA primary. The secondary is magic and on devfn2.
136	   For the moment we don't handle the secondary. FIXME */
137
138	if (PCI_FUNC(pdev->devfn) != 1)
139		return -ENODEV;
140
141	return ata_pci_bmdma_init_one(pdev, ppi, &cy82c693_sht, NULL, 0);
142}
143
144static const struct pci_device_id cy82c693[] = {
145	{ PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), },
146
147	{ },
148};
149
150static struct pci_driver cy82c693_pci_driver = {
151	.name 		= DRV_NAME,
152	.id_table	= cy82c693,
153	.probe 		= cy82c693_init_one,
154	.remove		= ata_pci_remove_one,
155#ifdef CONFIG_PM_SLEEP
156	.suspend	= ata_pci_device_suspend,
157	.resume		= ata_pci_device_resume,
158#endif
159};
160
161module_pci_driver(cy82c693_pci_driver);
162
163MODULE_AUTHOR("Alan Cox");
164MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller");
165MODULE_LICENSE("GPL");
166MODULE_DEVICE_TABLE(pci, cy82c693);
167MODULE_VERSION(DRV_VERSION);
168