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
25 enum {
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 static bool enable_dma = true;
45 module_param(enable_dma, bool, 0);
46 MODULE_PARM_DESC(enable_dma, "Enable bus master DMA operations");
47
48 /**
49 * cy82c693_set_piomode - set initial PIO mode data
50 * @ap: ATA interface
51 * @adev: ATA device
52 *
53 * Called to do the PIO mode setup.
54 */
55
cy82c693_set_piomode(struct ata_port * ap,struct ata_device * adev)56 static void cy82c693_set_piomode(struct ata_port *ap, struct ata_device *adev)
57 {
58 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
59 struct ata_timing t;
60 const unsigned long T = 1000000 / 33;
61 short time_16, time_8;
62 u32 addr;
63
64 if (ata_timing_compute(adev, adev->pio_mode, &t, T, 1) < 0) {
65 ata_dev_err(adev, DRV_NAME ": mome computation failed.\n");
66 return;
67 }
68
69 time_16 = clamp_val(t.recover - 1, 0, 15) |
70 (clamp_val(t.active - 1, 0, 15) << 4);
71 time_8 = clamp_val(t.act8b - 1, 0, 15) |
72 (clamp_val(t.rec8b - 1, 0, 15) << 4);
73
74 if (adev->devno == 0) {
75 pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
76
77 addr &= ~0x0F; /* Mask bits */
78 addr |= clamp_val(t.setup - 1, 0, 15);
79
80 pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
81 pci_write_config_byte(pdev, CY82_IDE_MASTER_IOR, time_16);
82 pci_write_config_byte(pdev, CY82_IDE_MASTER_IOW, time_16);
83 pci_write_config_byte(pdev, CY82_IDE_MASTER_8BIT, time_8);
84 } else {
85 pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
86
87 addr &= ~0xF0; /* Mask bits */
88 addr |= (clamp_val(t.setup - 1, 0, 15) << 4);
89
90 pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
91 pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOR, time_16);
92 pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOW, time_16);
93 pci_write_config_byte(pdev, CY82_IDE_SLAVE_8BIT, time_8);
94 }
95 }
96
97 /**
98 * cy82c693_set_dmamode - set initial DMA mode data
99 * @ap: ATA interface
100 * @adev: ATA device
101 *
102 * Called to do the DMA mode setup.
103 */
104
cy82c693_set_dmamode(struct ata_port * ap,struct ata_device * adev)105 static void cy82c693_set_dmamode(struct ata_port *ap, struct ata_device *adev)
106 {
107 int reg = CY82_INDEX_CHANNEL0 + ap->port_no;
108
109 /* Be afraid, be very afraid. Magic registers in low I/O space */
110 outb(reg, 0x22);
111 outb(adev->dma_mode - XFER_MW_DMA_0, 0x23);
112
113 /* 0x50 gives the best behaviour on the Alpha's using this chip */
114 outb(CY82_INDEX_TIMEOUT, 0x22);
115 outb(0x50, 0x23);
116 }
117
118 static const struct scsi_host_template cy82c693_sht = {
119 ATA_BMDMA_SHT(DRV_NAME),
120 };
121
122 static struct ata_port_operations cy82c693_port_ops = {
123 .inherits = &ata_bmdma_port_ops,
124 .cable_detect = ata_cable_40wire,
125 .set_piomode = cy82c693_set_piomode,
126 .set_dmamode = cy82c693_set_dmamode,
127 };
128
cy82c693_init_one(struct pci_dev * pdev,const struct pci_device_id * id)129 static int cy82c693_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
130 {
131 static struct ata_port_info info = {
132 .flags = ATA_FLAG_SLAVE_POSS,
133 .pio_mask = ATA_PIO4,
134 .port_ops = &cy82c693_port_ops
135 };
136 const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
137
138 if (enable_dma)
139 info.mwdma_mask = ATA_MWDMA2;
140
141 /* Devfn 1 is the ATA primary. The secondary is magic and on devfn2.
142 For the moment we don't handle the secondary. FIXME */
143
144 if (PCI_FUNC(pdev->devfn) != 1)
145 return -ENODEV;
146
147 return ata_pci_bmdma_init_one(pdev, ppi, &cy82c693_sht, NULL, 0);
148 }
149
150 static const struct pci_device_id cy82c693[] = {
151 { PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), },
152
153 { },
154 };
155
156 static struct pci_driver cy82c693_pci_driver = {
157 .name = DRV_NAME,
158 .id_table = cy82c693,
159 .probe = cy82c693_init_one,
160 .remove = ata_pci_remove_one,
161 #ifdef CONFIG_PM_SLEEP
162 .suspend = ata_pci_device_suspend,
163 .resume = ata_pci_device_resume,
164 #endif
165 };
166
167 module_pci_driver(cy82c693_pci_driver);
168
169 MODULE_AUTHOR("Alan Cox");
170 MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller");
171 MODULE_LICENSE("GPL");
172 MODULE_DEVICE_TABLE(pci, cy82c693);
173 MODULE_VERSION(DRV_VERSION);
174