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1da177e4 LT |
1 | /* |
2 | voodoo3.c - Part of lm_sensors, Linux kernel modules for hardware | |
3 | monitoring | |
4 | Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>, | |
5 | Philip Edelbrock <phil@netroedge.com>, | |
6 | Ralph Metzler <rjkm@thp.uni-koeln.de>, and | |
7 | Mark D. Studebaker <mdsxyz123@yahoo.com> | |
8 | ||
9 | Based on code written by Ralph Metzler <rjkm@thp.uni-koeln.de> and | |
10 | Simon Vogl | |
11 | ||
12 | This program is free software; you can redistribute it and/or modify | |
13 | it under the terms of the GNU General Public License as published by | |
14 | the Free Software Foundation; either version 2 of the License, or | |
15 | (at your option) any later version. | |
16 | ||
17 | This program is distributed in the hope that it will be useful, | |
18 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | GNU General Public License for more details. | |
21 | ||
22 | You should have received a copy of the GNU General Public License | |
23 | along with this program; if not, write to the Free Software | |
24 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
25 | */ | |
26 | ||
27 | /* This interfaces to the I2C bus of the Voodoo3 to gain access to | |
28 | the BT869 and possibly other I2C devices. */ | |
29 | ||
1da177e4 LT |
30 | #include <linux/kernel.h> |
31 | #include <linux/module.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/pci.h> | |
34 | #include <linux/i2c.h> | |
35 | #include <linux/i2c-algo-bit.h> | |
36 | #include <asm/io.h> | |
37 | ||
38 | /* the only registers we use */ | |
39 | #define REG 0x78 | |
40 | #define REG2 0x70 | |
41 | ||
42 | /* bit locations in the register */ | |
43 | #define DDC_ENAB 0x00040000 | |
44 | #define DDC_SCL_OUT 0x00080000 | |
45 | #define DDC_SDA_OUT 0x00100000 | |
46 | #define DDC_SCL_IN 0x00200000 | |
47 | #define DDC_SDA_IN 0x00400000 | |
48 | #define I2C_ENAB 0x00800000 | |
49 | #define I2C_SCL_OUT 0x01000000 | |
50 | #define I2C_SDA_OUT 0x02000000 | |
51 | #define I2C_SCL_IN 0x04000000 | |
52 | #define I2C_SDA_IN 0x08000000 | |
53 | ||
54 | /* initialization states */ | |
55 | #define INIT2 0x2 | |
56 | #define INIT3 0x4 | |
57 | ||
58 | /* delays */ | |
59 | #define CYCLE_DELAY 10 | |
60 | #define TIMEOUT (HZ / 2) | |
61 | ||
62 | ||
63 | static void __iomem *ioaddr; | |
64 | ||
65 | /* The voo GPIO registers don't have individual masks for each bit | |
66 | so we always have to read before writing. */ | |
67 | ||
68 | static void bit_vooi2c_setscl(void *data, int val) | |
69 | { | |
70 | unsigned int r; | |
71 | r = readl(ioaddr + REG); | |
72 | if (val) | |
73 | r |= I2C_SCL_OUT; | |
74 | else | |
75 | r &= ~I2C_SCL_OUT; | |
76 | writel(r, ioaddr + REG); | |
77 | readl(ioaddr + REG); /* flush posted write */ | |
78 | } | |
79 | ||
80 | static void bit_vooi2c_setsda(void *data, int val) | |
81 | { | |
82 | unsigned int r; | |
83 | r = readl(ioaddr + REG); | |
84 | if (val) | |
85 | r |= I2C_SDA_OUT; | |
86 | else | |
87 | r &= ~I2C_SDA_OUT; | |
88 | writel(r, ioaddr + REG); | |
89 | readl(ioaddr + REG); /* flush posted write */ | |
90 | } | |
91 | ||
92 | /* The GPIO pins are open drain, so the pins always remain outputs. | |
93 | We rely on the i2c-algo-bit routines to set the pins high before | |
94 | reading the input from other chips. */ | |
95 | ||
96 | static int bit_vooi2c_getscl(void *data) | |
97 | { | |
98 | return (0 != (readl(ioaddr + REG) & I2C_SCL_IN)); | |
99 | } | |
100 | ||
101 | static int bit_vooi2c_getsda(void *data) | |
102 | { | |
103 | return (0 != (readl(ioaddr + REG) & I2C_SDA_IN)); | |
104 | } | |
105 | ||
106 | static void bit_vooddc_setscl(void *data, int val) | |
107 | { | |
108 | unsigned int r; | |
109 | r = readl(ioaddr + REG); | |
110 | if (val) | |
111 | r |= DDC_SCL_OUT; | |
112 | else | |
113 | r &= ~DDC_SCL_OUT; | |
114 | writel(r, ioaddr + REG); | |
115 | readl(ioaddr + REG); /* flush posted write */ | |
116 | } | |
117 | ||
118 | static void bit_vooddc_setsda(void *data, int val) | |
119 | { | |
120 | unsigned int r; | |
121 | r = readl(ioaddr + REG); | |
122 | if (val) | |
123 | r |= DDC_SDA_OUT; | |
124 | else | |
125 | r &= ~DDC_SDA_OUT; | |
126 | writel(r, ioaddr + REG); | |
127 | readl(ioaddr + REG); /* flush posted write */ | |
128 | } | |
129 | ||
130 | static int bit_vooddc_getscl(void *data) | |
131 | { | |
132 | return (0 != (readl(ioaddr + REG) & DDC_SCL_IN)); | |
133 | } | |
134 | ||
135 | static int bit_vooddc_getsda(void *data) | |
136 | { | |
137 | return (0 != (readl(ioaddr + REG) & DDC_SDA_IN)); | |
138 | } | |
139 | ||
140 | static int config_v3(struct pci_dev *dev) | |
141 | { | |
142 | unsigned long cadr; | |
143 | ||
144 | /* map Voodoo3 memory */ | |
145 | cadr = dev->resource[0].start; | |
146 | cadr &= PCI_BASE_ADDRESS_MEM_MASK; | |
147 | ioaddr = ioremap_nocache(cadr, 0x1000); | |
148 | if (ioaddr) { | |
149 | writel(0x8160, ioaddr + REG2); | |
150 | writel(0xcffc0020, ioaddr + REG); | |
151 | dev_info(&dev->dev, "Using Banshee/Voodoo3 I2C device at %p\n", ioaddr); | |
152 | return 0; | |
153 | } | |
154 | return -ENODEV; | |
155 | } | |
156 | ||
157 | static struct i2c_algo_bit_data voo_i2c_bit_data = { | |
158 | .setsda = bit_vooi2c_setsda, | |
159 | .setscl = bit_vooi2c_setscl, | |
160 | .getsda = bit_vooi2c_getsda, | |
161 | .getscl = bit_vooi2c_getscl, | |
162 | .udelay = CYCLE_DELAY, | |
1da177e4 LT |
163 | .timeout = TIMEOUT |
164 | }; | |
165 | ||
166 | static struct i2c_adapter voodoo3_i2c_adapter = { | |
167 | .owner = THIS_MODULE, | |
168 | .class = I2C_CLASS_TV_ANALOG, | |
169 | .name = "I2C Voodoo3/Banshee adapter", | |
170 | .algo_data = &voo_i2c_bit_data, | |
171 | }; | |
172 | ||
173 | static struct i2c_algo_bit_data voo_ddc_bit_data = { | |
174 | .setsda = bit_vooddc_setsda, | |
175 | .setscl = bit_vooddc_setscl, | |
176 | .getsda = bit_vooddc_getsda, | |
177 | .getscl = bit_vooddc_getscl, | |
178 | .udelay = CYCLE_DELAY, | |
1da177e4 LT |
179 | .timeout = TIMEOUT |
180 | }; | |
181 | ||
182 | static struct i2c_adapter voodoo3_ddc_adapter = { | |
183 | .owner = THIS_MODULE, | |
184 | .class = I2C_CLASS_DDC, | |
185 | .name = "DDC Voodoo3/Banshee adapter", | |
186 | .algo_data = &voo_ddc_bit_data, | |
187 | }; | |
188 | ||
189 | static struct pci_device_id voodoo3_ids[] __devinitdata = { | |
190 | { PCI_DEVICE(PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_VOODOO3) }, | |
191 | { PCI_DEVICE(PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_BANSHEE) }, | |
192 | { 0, } | |
193 | }; | |
194 | ||
195 | MODULE_DEVICE_TABLE (pci, voodoo3_ids); | |
196 | ||
197 | static int __devinit voodoo3_probe(struct pci_dev *dev, const struct pci_device_id *id) | |
198 | { | |
199 | int retval; | |
200 | ||
201 | retval = config_v3(dev); | |
202 | if (retval) | |
203 | return retval; | |
204 | ||
205 | /* set up the sysfs linkage to our parent device */ | |
206 | voodoo3_i2c_adapter.dev.parent = &dev->dev; | |
207 | voodoo3_ddc_adapter.dev.parent = &dev->dev; | |
208 | ||
209 | retval = i2c_bit_add_bus(&voodoo3_i2c_adapter); | |
210 | if (retval) | |
211 | return retval; | |
212 | retval = i2c_bit_add_bus(&voodoo3_ddc_adapter); | |
213 | if (retval) | |
3269711b | 214 | i2c_del_adapter(&voodoo3_i2c_adapter); |
1da177e4 LT |
215 | return retval; |
216 | } | |
217 | ||
218 | static void __devexit voodoo3_remove(struct pci_dev *dev) | |
219 | { | |
3269711b JD |
220 | i2c_del_adapter(&voodoo3_i2c_adapter); |
221 | i2c_del_adapter(&voodoo3_ddc_adapter); | |
1da177e4 LT |
222 | iounmap(ioaddr); |
223 | } | |
224 | ||
225 | static struct pci_driver voodoo3_driver = { | |
226 | .name = "voodoo3_smbus", | |
227 | .id_table = voodoo3_ids, | |
228 | .probe = voodoo3_probe, | |
229 | .remove = __devexit_p(voodoo3_remove), | |
230 | }; | |
231 | ||
232 | static int __init i2c_voodoo3_init(void) | |
233 | { | |
234 | return pci_register_driver(&voodoo3_driver); | |
235 | } | |
236 | ||
237 | static void __exit i2c_voodoo3_exit(void) | |
238 | { | |
239 | pci_unregister_driver(&voodoo3_driver); | |
240 | } | |
241 | ||
242 | ||
243 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, " | |
244 | "Philip Edelbrock <phil@netroedge.com>, " | |
245 | "Ralph Metzler <rjkm@thp.uni-koeln.de>, " | |
246 | "and Mark D. Studebaker <mdsxyz123@yahoo.com>"); | |
247 | MODULE_DESCRIPTION("Voodoo3 I2C/SMBus driver"); | |
248 | MODULE_LICENSE("GPL"); | |
249 | ||
250 | module_init(i2c_voodoo3_init); | |
251 | module_exit(i2c_voodoo3_exit); |