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1 | /* |
2 | * |
3 | * BRIEF MODULE DESCRIPTION |
4 | * IT8172 IDE controller support |
5 | * |
6 | * Copyright (C) 2000 MontaVista Software Inc. |
7 | * Copyright (C) 2008 Shane McDonald |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it |
10 | * under the terms of the GNU General Public License as published by the |
11 | * Free Software Foundation; either version 2 of the License, or (at your |
12 | * option) any later version. |
13 | * |
14 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
15 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
16 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN |
17 | * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
20 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
21 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
24 | * |
25 | * You should have received a copy of the GNU General Public License along |
26 | * with this program; if not, write to the Free Software Foundation, Inc., |
27 | * 675 Mass Ave, Cambridge, MA 02139, USA. |
28 | */ |
29 | |
30 | #include <linux/module.h> |
31 | #include <linux/types.h> |
32 | #include <linux/kernel.h> |
33 | #include <linux/ioport.h> |
34 | #include <linux/pci.h> |
35 | #include <linux/ide.h> |
36 | #include <linux/init.h> |
37 | |
38 | #define DRV_NAME "IT8172" |
39 | |
40 | static void it8172_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive) |
41 | { |
42 | struct pci_dev *dev = to_pci_dev(hwif->dev); |
43 | u16 drive_enables; |
44 | u32 drive_timing; |
45 | const u8 pio = drive->pio_mode - XFER_PIO_0; |
46 | |
47 | /* |
48 | * The highest value of DIOR/DIOW pulse width and recovery time |
49 | * that can be set in the IT8172 is 8 PCI clock cycles. As a result, |
50 | * it cannot be configured for PIO mode 0. This table sets these |
51 | * parameters to the maximum supported by the IT8172. |
52 | */ |
53 | static const u8 timings[] = { 0x3f, 0x3c, 0x1b, 0x12, 0x0a }; |
54 | |
55 | pci_read_config_word(dev, 0x40, &drive_enables); |
56 | pci_read_config_dword(dev, 0x44, &drive_timing); |
57 | |
58 | /* |
59 | * Enable port 0x44. The IT8172 spec is confused; it calls |
60 | * this register the "Slave IDE Timing Register", but in fact, |
61 | * it controls timing for both master and slave drives. |
62 | */ |
63 | drive_enables |= 0x4000; |
64 | |
65 | drive_enables &= drive->dn ? 0xc006 : 0xc060; |
66 | if (drive->media == ide_disk) |
67 | /* enable prefetch */ |
68 | drive_enables |= 0x0004 << (drive->dn * 4); |
69 | if (ide_pio_need_iordy(drive, pio)) |
70 | /* enable IORDY sample-point */ |
71 | drive_enables |= 0x0002 << (drive->dn * 4); |
72 | |
73 | drive_timing &= drive->dn ? 0x00003f00 : 0x000fc000; |
74 | drive_timing |= timings[pio] << (drive->dn * 6 + 8); |
75 | |
76 | pci_write_config_word(dev, 0x40, drive_enables); |
77 | pci_write_config_dword(dev, 0x44, drive_timing); |
78 | } |
79 | |
80 | static void it8172_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive) |
81 | { |
82 | struct pci_dev *dev = to_pci_dev(hwif->dev); |
83 | int a_speed = 3 << (drive->dn * 4); |
84 | int u_flag = 1 << drive->dn; |
85 | int u_speed = 0; |
86 | u8 reg48, reg4a; |
87 | const u8 speed = drive->dma_mode; |
88 | |
89 | pci_read_config_byte(dev, 0x48, ®48); |
90 | pci_read_config_byte(dev, 0x4a, ®4a); |
91 | |
92 | if (speed >= XFER_UDMA_0) { |
93 | u8 udma = speed - XFER_UDMA_0; |
94 | u_speed = udma << (drive->dn * 4); |
95 | |
96 | pci_write_config_byte(dev, 0x48, reg48 | u_flag); |
97 | reg4a &= ~a_speed; |
98 | pci_write_config_byte(dev, 0x4a, reg4a | u_speed); |
99 | } else { |
100 | const u8 mwdma_to_pio[] = { 0, 3, 4 }; |
101 | |
102 | pci_write_config_byte(dev, 0x48, reg48 & ~u_flag); |
103 | pci_write_config_byte(dev, 0x4a, reg4a & ~a_speed); |
104 | |
105 | drive->pio_mode = |
106 | mwdma_to_pio[speed - XFER_MW_DMA_0] + XFER_PIO_0; |
107 | |
108 | it8172_set_pio_mode(hwif, drive); |
109 | } |
110 | } |
111 | |
112 | |
113 | static const struct ide_port_ops it8172_port_ops = { |
114 | .set_pio_mode = it8172_set_pio_mode, |
115 | .set_dma_mode = it8172_set_dma_mode, |
116 | }; |
117 | |
118 | static const struct ide_port_info it8172_port_info = { |
119 | .name = DRV_NAME, |
120 | .port_ops = &it8172_port_ops, |
121 | .enablebits = { {0x41, 0x80, 0x80}, {0x00, 0x00, 0x00} }, |
122 | .host_flags = IDE_HFLAG_SINGLE, |
123 | .pio_mask = ATA_PIO4 & ~ATA_PIO0, |
124 | .mwdma_mask = ATA_MWDMA2, |
125 | .udma_mask = ATA_UDMA2, |
126 | }; |
127 | |
128 | static int it8172_init_one(struct pci_dev *dev, const struct pci_device_id *id) |
129 | { |
130 | if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE) |
131 | return -ENODEV; /* IT8172 is more than an IDE controller */ |
132 | return ide_pci_init_one(dev, &it8172_port_info, NULL); |
133 | } |
134 | |
135 | static struct pci_device_id it8172_pci_tbl[] = { |
136 | { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8172), 0 }, |
137 | { 0, }, |
138 | }; |
139 | MODULE_DEVICE_TABLE(pci, it8172_pci_tbl); |
140 | |
141 | static struct pci_driver it8172_pci_driver = { |
142 | .name = "IT8172_IDE", |
143 | .id_table = it8172_pci_tbl, |
144 | .probe = it8172_init_one, |
145 | .remove = ide_pci_remove, |
146 | .suspend = ide_pci_suspend, |
147 | .resume = ide_pci_resume, |
148 | }; |
149 | |
150 | static int __init it8172_ide_init(void) |
151 | { |
152 | return ide_pci_register_driver(&it8172_pci_driver); |
153 | } |
154 | |
155 | static void __exit it8172_ide_exit(void) |
156 | { |
157 | pci_unregister_driver(&it8172_pci_driver); |
158 | } |
159 | |
160 | module_init(it8172_ide_init); |
161 | module_exit(it8172_ide_exit); |
162 | |
163 | MODULE_AUTHOR("Steve Longerbeam"); |
164 | MODULE_DESCRIPTION("PCI driver module for ITE 8172 IDE"); |
165 | MODULE_LICENSE("GPL"); |
166 |
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