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