Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | i2c-savage4.c - Part of lm_sensors, Linux kernel modules for hardware | |
3 | monitoring | |
4 | Copyright (C) 1998-2003 The LM Sensors Team | |
5 | Alexander Wold <awold@bigfoot.com> | |
6 | Mark D. Studebaker <mdsxyz123@yahoo.com> | |
7 | ||
8 | Based on i2c-voodoo3.c. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with this program; if not, write to the Free Software | |
22 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | */ | |
24 | ||
25 | /* This interfaces to the I2C bus of the Savage4 to gain access to | |
26 | the BT869 and possibly other I2C devices. The DDC bus is not | |
27 | yet supported because its register is not memory-mapped. | |
28 | However we leave the DDC code here, commented out, to make | |
29 | it easier to add later. | |
30 | */ | |
31 | ||
1da177e4 LT |
32 | #include <linux/kernel.h> |
33 | #include <linux/module.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/pci.h> | |
36 | #include <linux/i2c.h> | |
37 | #include <linux/i2c-algo-bit.h> | |
38 | #include <asm/io.h> | |
39 | ||
40 | /* 3DFX defines */ | |
41 | #define PCI_CHIP_SAVAGE3D 0x8A20 | |
42 | #define PCI_CHIP_SAVAGE3D_MV 0x8A21 | |
43 | #define PCI_CHIP_SAVAGE4 0x8A22 | |
44 | #define PCI_CHIP_SAVAGE2000 0x9102 | |
45 | #define PCI_CHIP_PROSAVAGE_PM 0x8A25 | |
46 | #define PCI_CHIP_PROSAVAGE_KM 0x8A26 | |
47 | #define PCI_CHIP_SAVAGE_MX_MV 0x8c10 | |
48 | #define PCI_CHIP_SAVAGE_MX 0x8c11 | |
49 | #define PCI_CHIP_SAVAGE_IX_MV 0x8c12 | |
50 | #define PCI_CHIP_SAVAGE_IX 0x8c13 | |
51 | ||
52 | #define REG 0xff20 /* Serial Port 1 Register */ | |
53 | ||
54 | /* bit locations in the register */ | |
55 | #define DDC_ENAB 0x00040000 | |
56 | #define DDC_SCL_OUT 0x00080000 | |
57 | #define DDC_SDA_OUT 0x00100000 | |
58 | #define DDC_SCL_IN 0x00200000 | |
59 | #define DDC_SDA_IN 0x00400000 | |
60 | #define I2C_ENAB 0x00000020 | |
61 | #define I2C_SCL_OUT 0x00000001 | |
62 | #define I2C_SDA_OUT 0x00000002 | |
63 | #define I2C_SCL_IN 0x00000008 | |
64 | #define I2C_SDA_IN 0x00000010 | |
65 | ||
66 | /* initialization states */ | |
67 | #define INIT2 0x20 | |
68 | #define INIT3 0x04 | |
69 | ||
70 | /* delays */ | |
71 | #define CYCLE_DELAY 10 | |
72 | #define TIMEOUT (HZ / 2) | |
73 | ||
74 | ||
75 | static void __iomem *ioaddr; | |
76 | ||
77 | /* The sav GPIO registers don't have individual masks for each bit | |
78 | so we always have to read before writing. */ | |
79 | ||
80 | static void bit_savi2c_setscl(void *data, int val) | |
81 | { | |
82 | unsigned int r; | |
83 | r = readl(ioaddr + REG); | |
84 | if(val) | |
85 | r |= I2C_SCL_OUT; | |
86 | else | |
87 | r &= ~I2C_SCL_OUT; | |
88 | writel(r, ioaddr + REG); | |
89 | readl(ioaddr + REG); /* flush posted write */ | |
90 | } | |
91 | ||
92 | static void bit_savi2c_setsda(void *data, int val) | |
93 | { | |
94 | unsigned int r; | |
95 | r = readl(ioaddr + REG); | |
96 | if(val) | |
97 | r |= I2C_SDA_OUT; | |
98 | else | |
99 | r &= ~I2C_SDA_OUT; | |
100 | writel(r, ioaddr + REG); | |
101 | readl(ioaddr + REG); /* flush posted write */ | |
102 | } | |
103 | ||
104 | /* The GPIO pins are open drain, so the pins always remain outputs. | |
105 | We rely on the i2c-algo-bit routines to set the pins high before | |
106 | reading the input from other chips. */ | |
107 | ||
108 | static int bit_savi2c_getscl(void *data) | |
109 | { | |
110 | return (0 != (readl(ioaddr + REG) & I2C_SCL_IN)); | |
111 | } | |
112 | ||
113 | static int bit_savi2c_getsda(void *data) | |
114 | { | |
115 | return (0 != (readl(ioaddr + REG) & I2C_SDA_IN)); | |
116 | } | |
117 | ||
118 | /* Configures the chip */ | |
119 | ||
120 | static int config_s4(struct pci_dev *dev) | |
121 | { | |
122 | unsigned long cadr; | |
123 | ||
124 | /* map memory */ | |
125 | cadr = dev->resource[0].start; | |
126 | cadr &= PCI_BASE_ADDRESS_MEM_MASK; | |
127 | ioaddr = ioremap_nocache(cadr, 0x0080000); | |
128 | if (ioaddr) { | |
129 | /* writel(0x8160, ioaddr + REG2); */ | |
130 | writel(0x00000020, ioaddr + REG); | |
131 | dev_info(&dev->dev, "Using Savage4 at %p\n", ioaddr); | |
132 | return 0; | |
133 | } | |
134 | return -ENODEV; | |
135 | } | |
136 | ||
137 | static struct i2c_algo_bit_data sav_i2c_bit_data = { | |
138 | .setsda = bit_savi2c_setsda, | |
139 | .setscl = bit_savi2c_setscl, | |
140 | .getsda = bit_savi2c_getsda, | |
141 | .getscl = bit_savi2c_getscl, | |
142 | .udelay = CYCLE_DELAY, | |
1da177e4 LT |
143 | .timeout = TIMEOUT |
144 | }; | |
145 | ||
146 | static struct i2c_adapter savage4_i2c_adapter = { | |
147 | .owner = THIS_MODULE, | |
148 | .name = "I2C Savage4 adapter", | |
149 | .algo_data = &sav_i2c_bit_data, | |
150 | }; | |
151 | ||
152 | static struct pci_device_id savage4_ids[] __devinitdata = { | |
153 | { PCI_DEVICE(PCI_VENDOR_ID_S3, PCI_CHIP_SAVAGE4) }, | |
154 | { PCI_DEVICE(PCI_VENDOR_ID_S3, PCI_CHIP_SAVAGE2000) }, | |
155 | { 0, } | |
156 | }; | |
157 | ||
158 | MODULE_DEVICE_TABLE (pci, savage4_ids); | |
159 | ||
160 | static int __devinit savage4_probe(struct pci_dev *dev, const struct pci_device_id *id) | |
161 | { | |
162 | int retval; | |
163 | ||
164 | retval = config_s4(dev); | |
165 | if (retval) | |
166 | return retval; | |
167 | ||
168 | /* set up the sysfs linkage to our parent device */ | |
169 | savage4_i2c_adapter.dev.parent = &dev->dev; | |
170 | ||
171 | return i2c_bit_add_bus(&savage4_i2c_adapter); | |
172 | } | |
173 | ||
174 | static void __devexit savage4_remove(struct pci_dev *dev) | |
175 | { | |
3269711b | 176 | i2c_del_adapter(&savage4_i2c_adapter); |
1da177e4 LT |
177 | iounmap(ioaddr); |
178 | } | |
179 | ||
180 | static struct pci_driver savage4_driver = { | |
181 | .name = "savage4_smbus", | |
182 | .id_table = savage4_ids, | |
183 | .probe = savage4_probe, | |
184 | .remove = __devexit_p(savage4_remove), | |
185 | }; | |
186 | ||
187 | static int __init i2c_savage4_init(void) | |
188 | { | |
189 | return pci_register_driver(&savage4_driver); | |
190 | } | |
191 | ||
192 | static void __exit i2c_savage4_exit(void) | |
193 | { | |
194 | pci_unregister_driver(&savage4_driver); | |
195 | } | |
196 | ||
197 | MODULE_AUTHOR("Alexander Wold <awold@bigfoot.com> " | |
198 | "and Mark D. Studebaker <mdsxyz123@yahoo.com>"); | |
199 | MODULE_DESCRIPTION("Savage4 I2C/SMBus driver"); | |
200 | MODULE_LICENSE("GPL"); | |
201 | ||
202 | module_init(i2c_savage4_init); | |
203 | module_exit(i2c_savage4_exit); |