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1da177e4 LT |
1 | /* |
2 | i2c-hydra.c - Part of lm_sensors, Linux kernel modules | |
3 | for hardware monitoring | |
4 | ||
5 | i2c Support for the Apple `Hydra' Mac I/O | |
6 | ||
7 | Copyright (c) 1999-2004 Geert Uytterhoeven <geert@linux-m68k.org> | |
8 | ||
9 | Based on i2c Support for Via Technologies 82C586B South Bridge | |
96de0e25 | 10 | Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi> |
1da177e4 LT |
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 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/pci.h> | |
30 | #include <linux/types.h> | |
31 | #include <linux/i2c.h> | |
32 | #include <linux/i2c-algo-bit.h> | |
33 | #include <linux/init.h> | |
34 | #include <asm/io.h> | |
35 | #include <asm/hydra.h> | |
36 | ||
37 | ||
38 | #define HYDRA_CPD_PD0 0x00000001 /* CachePD lines */ | |
39 | #define HYDRA_CPD_PD1 0x00000002 | |
40 | #define HYDRA_CPD_PD2 0x00000004 | |
41 | #define HYDRA_CPD_PD3 0x00000008 | |
42 | ||
43 | #define HYDRA_SCLK HYDRA_CPD_PD0 | |
44 | #define HYDRA_SDAT HYDRA_CPD_PD1 | |
45 | #define HYDRA_SCLK_OE 0x00000010 | |
46 | #define HYDRA_SDAT_OE 0x00000020 | |
47 | ||
48 | static inline void pdregw(void *data, u32 val) | |
49 | { | |
50 | struct Hydra *hydra = (struct Hydra *)data; | |
51 | writel(val, &hydra->CachePD); | |
52 | } | |
53 | ||
54 | static inline u32 pdregr(void *data) | |
55 | { | |
56 | struct Hydra *hydra = (struct Hydra *)data; | |
57 | return readl(&hydra->CachePD); | |
58 | } | |
59 | ||
60 | static void hydra_bit_setscl(void *data, int state) | |
61 | { | |
62 | u32 val = pdregr(data); | |
63 | if (state) | |
64 | val &= ~HYDRA_SCLK_OE; | |
65 | else { | |
66 | val &= ~HYDRA_SCLK; | |
67 | val |= HYDRA_SCLK_OE; | |
68 | } | |
69 | pdregw(data, val); | |
70 | } | |
71 | ||
72 | static void hydra_bit_setsda(void *data, int state) | |
73 | { | |
74 | u32 val = pdregr(data); | |
75 | if (state) | |
76 | val &= ~HYDRA_SDAT_OE; | |
77 | else { | |
78 | val &= ~HYDRA_SDAT; | |
79 | val |= HYDRA_SDAT_OE; | |
80 | } | |
81 | pdregw(data, val); | |
82 | } | |
83 | ||
84 | static int hydra_bit_getscl(void *data) | |
85 | { | |
86 | return (pdregr(data) & HYDRA_SCLK) != 0; | |
87 | } | |
88 | ||
89 | static int hydra_bit_getsda(void *data) | |
90 | { | |
91 | return (pdregr(data) & HYDRA_SDAT) != 0; | |
92 | } | |
93 | ||
94 | /* ------------------------------------------------------------------------ */ | |
95 | ||
96 | static struct i2c_algo_bit_data hydra_bit_data = { | |
97 | .setsda = hydra_bit_setsda, | |
98 | .setscl = hydra_bit_setscl, | |
99 | .getsda = hydra_bit_getsda, | |
100 | .getscl = hydra_bit_getscl, | |
101 | .udelay = 5, | |
1da177e4 LT |
102 | .timeout = HZ |
103 | }; | |
104 | ||
105 | static struct i2c_adapter hydra_adap = { | |
106 | .owner = THIS_MODULE, | |
107 | .name = "Hydra i2c", | |
108 | .id = I2C_HW_B_HYDRA, | |
109 | .algo_data = &hydra_bit_data, | |
110 | }; | |
111 | ||
112 | static struct pci_device_id hydra_ids[] = { | |
113 | { PCI_DEVICE(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_HYDRA) }, | |
114 | { 0, } | |
115 | }; | |
116 | ||
117 | MODULE_DEVICE_TABLE (pci, hydra_ids); | |
118 | ||
119 | static int __devinit hydra_probe(struct pci_dev *dev, | |
120 | const struct pci_device_id *id) | |
121 | { | |
122 | unsigned long base = pci_resource_start(dev, 0); | |
123 | int res; | |
124 | ||
125 | if (!request_mem_region(base+offsetof(struct Hydra, CachePD), 4, | |
126 | hydra_adap.name)) | |
127 | return -EBUSY; | |
128 | ||
129 | hydra_bit_data.data = ioremap(base, pci_resource_len(dev, 0)); | |
130 | if (hydra_bit_data.data == NULL) { | |
131 | release_mem_region(base+offsetof(struct Hydra, CachePD), 4); | |
132 | return -ENODEV; | |
133 | } | |
134 | ||
135 | pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */ | |
136 | hydra_adap.dev.parent = &dev->dev; | |
137 | res = i2c_bit_add_bus(&hydra_adap); | |
138 | if (res < 0) { | |
139 | iounmap(hydra_bit_data.data); | |
140 | release_mem_region(base+offsetof(struct Hydra, CachePD), 4); | |
141 | return res; | |
142 | } | |
143 | return 0; | |
144 | } | |
145 | ||
146 | static void __devexit hydra_remove(struct pci_dev *dev) | |
147 | { | |
148 | pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */ | |
3269711b | 149 | i2c_del_adapter(&hydra_adap); |
1da177e4 LT |
150 | iounmap(hydra_bit_data.data); |
151 | release_mem_region(pci_resource_start(dev, 0)+ | |
152 | offsetof(struct Hydra, CachePD), 4); | |
153 | } | |
154 | ||
155 | ||
156 | static struct pci_driver hydra_driver = { | |
157 | .name = "hydra_smbus", | |
158 | .id_table = hydra_ids, | |
159 | .probe = hydra_probe, | |
160 | .remove = __devexit_p(hydra_remove), | |
161 | }; | |
162 | ||
163 | static int __init i2c_hydra_init(void) | |
164 | { | |
165 | return pci_register_driver(&hydra_driver); | |
166 | } | |
167 | ||
168 | ||
169 | static void __exit i2c_hydra_exit(void) | |
170 | { | |
171 | pci_unregister_driver(&hydra_driver); | |
172 | } | |
173 | ||
174 | ||
175 | ||
176 | MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>"); | |
177 | MODULE_DESCRIPTION("i2c for Apple Hydra Mac I/O"); | |
178 | MODULE_LICENSE("GPL"); | |
179 | ||
180 | module_init(i2c_hydra_init); | |
181 | module_exit(i2c_hydra_exit); | |
182 |