xref: /openbmc/linux/drivers/ata/pata_cypress.c (revision 293d5b43)
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 
24 enum {
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 
51 static 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 
100 static 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 
113 static struct scsi_host_template cy82c693_sht = {
114 	ATA_BMDMA_SHT(DRV_NAME),
115 };
116 
117 static 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 
124 static 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 
143 static const struct pci_device_id cy82c693[] = {
144 	{ PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), },
145 
146 	{ },
147 };
148 
149 static 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 
160 module_pci_driver(cy82c693_pci_driver);
161 
162 MODULE_AUTHOR("Alan Cox");
163 MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller");
164 MODULE_LICENSE("GPL");
165 MODULE_DEVICE_TABLE(pci, cy82c693);
166 MODULE_VERSION(DRV_VERSION);
167