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