summaryrefslogtreecommitdiffstats
path: root/drivers/ata/pata_cypress.c
blob: ae14969e1dfe1646ec58aa08825e02bed5619ce4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
/*
 * pata_cypress.c 	- Cypress PATA for new ATA layer
 *			  (C) 2006 Red Hat Inc
 *			  Alan Cox <alan@redhat.com>
 *
 * Based heavily on
 * linux/drivers/ide/pci/cy82c693.c		Version 0.40	Sep. 10, 2002
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>

#define DRV_NAME "pata_cypress"
#define DRV_VERSION "0.1.5"

/* here are the offset definitions for the registers */

enum {
	CY82_IDE_CMDREG		= 0x04,
	CY82_IDE_ADDRSETUP	= 0x48,
	CY82_IDE_MASTER_IOR	= 0x4C,
	CY82_IDE_MASTER_IOW	= 0x4D,
	CY82_IDE_SLAVE_IOR	= 0x4E,
	CY82_IDE_SLAVE_IOW	= 0x4F,
	CY82_IDE_MASTER_8BIT	= 0x50,
	CY82_IDE_SLAVE_8BIT	= 0x51,

	CY82_INDEX_PORT		= 0x22,
	CY82_DATA_PORT		= 0x23,

	CY82_INDEX_CTRLREG1	= 0x01,
	CY82_INDEX_CHANNEL0	= 0x30,
	CY82_INDEX_CHANNEL1	= 0x31,
	CY82_INDEX_TIMEOUT	= 0x32
};

/**
 *	cy82c693_set_piomode	-	set initial PIO mode data
 *	@ap: ATA interface
 *	@adev: ATA device
 *
 *	Called to do the PIO mode setup.
 */

static void cy82c693_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	struct ata_timing t;
	const unsigned long T = 1000000 / 33;
	short time_16, time_8;
	u32 addr;

	if (ata_timing_compute(adev, adev->pio_mode, &t, T, 1) < 0) {
		printk(KERN_ERR DRV_NAME ": mome computation failed.\n");
		return;
	}

	time_16 = FIT(t.recover, 0, 15) | (FIT(t.active, 0, 15) << 4);
	time_8 = FIT(t.act8b, 0, 15) | (FIT(t.rec8b, 0, 15) << 4);

	if (adev->devno == 0) {
		pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);

		addr &= ~0x0F;	/* Mask bits */
		addr |= FIT(t.setup, 0, 15);

		pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
		pci_write_config_byte(pdev, CY82_IDE_MASTER_IOR, time_16);
		pci_write_config_byte(pdev, CY82_IDE_MASTER_IOW, time_16);
		pci_write_config_byte(pdev, CY82_IDE_MASTER_8BIT, time_8);
	} else {
		pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);

		addr &= ~0xF0;	/* Mask bits */
		addr |= (FIT(t.setup, 0, 15) << 4);

		pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
		pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOR, time_16);
		pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOW, time_16);
		pci_write_config_byte(pdev, CY82_IDE_SLAVE_8BIT, time_8);
	}
}

/**
 *	cy82c693_set_dmamode	-	set initial DMA mode data
 *	@ap: ATA interface
 *	@adev: ATA device
 *
 *	Called to do the DMA mode setup.
 */

static void cy82c693_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
	int reg = CY82_INDEX_CHANNEL0 + ap->port_no;

	/* Be afraid, be very afraid. Magic registers  in low I/O space */
	outb(reg, 0x22);
	outb(adev->dma_mode - XFER_MW_DMA_0, 0x23);

	/* 0x50 gives the best behaviour on the Alpha's using this chip */
	outb(CY82_INDEX_TIMEOUT, 0x22);
	outb(0x50, 0x23);
}

static struct scsi_host_template cy82c693_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
};

static struct ata_port_operations cy82c693_port_ops = {
	.inherits	= &ata_bmdma_port_ops,
	.cable_detect	= ata_cable_40wire,
	.set_piomode	= cy82c693_set_piomode,
	.set_dmamode	= cy82c693_set_dmamode,
};

static int cy82c693_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
	static const struct ata_port_info info = {
		.flags = ATA_FLAG_SLAVE_POSS,
		.pio_mask = 0x1f,
		.mwdma_mask = 0x07,
		.port_ops = &cy82c693_port_ops
	};
	const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };

	/* Devfn 1 is the ATA primary. The secondary is magic and on devfn2.
	   For the moment we don't handle the secondary. FIXME */

	if (PCI_FUNC(pdev->devfn) != 1)
		return -ENODEV;

	return ata_pci_init_one(pdev, ppi, &cy82c693_sht, NULL);
}

static const struct pci_device_id cy82c693[] = {
	{ PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), },

	{ },
};

static struct pci_driver cy82c693_pci_driver = {
	.name 		= DRV_NAME,
	.id_table	= cy82c693,
	.probe 		= cy82c693_init_one,
	.remove		= ata_pci_remove_one,
#ifdef CONFIG_PM
	.suspend	= ata_pci_device_suspend,
	.resume		= ata_pci_device_resume,
#endif
};

static int __init cy82c693_init(void)
{
	return pci_register_driver(&cy82c693_pci_driver);
}


static void __exit cy82c693_exit(void)
{
	pci_unregister_driver(&cy82c693_pci_driver);
}


MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, cy82c693);
MODULE_VERSION(DRV_VERSION);

module_init(cy82c693_init);
module_exit(cy82c693_exit);