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1da177e4 | 1 | /* |
1da177e4 LT |
2 | i2c Support for the Apple `Hydra' Mac I/O |
3 | ||
4 | Copyright (c) 1999-2004 Geert Uytterhoeven <geert@linux-m68k.org> | |
5 | ||
6 | Based on i2c Support for Via Technologies 82C586B South Bridge | |
96de0e25 | 7 | Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi> |
1da177e4 LT |
8 | |
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | */ | |
23 | ||
24 | #include <linux/kernel.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/pci.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/i2c.h> | |
29 | #include <linux/i2c-algo-bit.h> | |
30 | #include <linux/init.h> | |
21782180 | 31 | #include <linux/io.h> |
1da177e4 LT |
32 | #include <asm/hydra.h> |
33 | ||
34 | ||
35 | #define HYDRA_CPD_PD0 0x00000001 /* CachePD lines */ | |
36 | #define HYDRA_CPD_PD1 0x00000002 | |
37 | #define HYDRA_CPD_PD2 0x00000004 | |
38 | #define HYDRA_CPD_PD3 0x00000008 | |
39 | ||
40 | #define HYDRA_SCLK HYDRA_CPD_PD0 | |
41 | #define HYDRA_SDAT HYDRA_CPD_PD1 | |
42 | #define HYDRA_SCLK_OE 0x00000010 | |
43 | #define HYDRA_SDAT_OE 0x00000020 | |
44 | ||
45 | static inline void pdregw(void *data, u32 val) | |
46 | { | |
47 | struct Hydra *hydra = (struct Hydra *)data; | |
48 | writel(val, &hydra->CachePD); | |
49 | } | |
50 | ||
51 | static inline u32 pdregr(void *data) | |
52 | { | |
53 | struct Hydra *hydra = (struct Hydra *)data; | |
54 | return readl(&hydra->CachePD); | |
55 | } | |
56 | ||
57 | static void hydra_bit_setscl(void *data, int state) | |
58 | { | |
59 | u32 val = pdregr(data); | |
60 | if (state) | |
61 | val &= ~HYDRA_SCLK_OE; | |
62 | else { | |
63 | val &= ~HYDRA_SCLK; | |
64 | val |= HYDRA_SCLK_OE; | |
65 | } | |
66 | pdregw(data, val); | |
67 | } | |
68 | ||
69 | static void hydra_bit_setsda(void *data, int state) | |
70 | { | |
71 | u32 val = pdregr(data); | |
72 | if (state) | |
73 | val &= ~HYDRA_SDAT_OE; | |
74 | else { | |
75 | val &= ~HYDRA_SDAT; | |
76 | val |= HYDRA_SDAT_OE; | |
77 | } | |
78 | pdregw(data, val); | |
79 | } | |
80 | ||
81 | static int hydra_bit_getscl(void *data) | |
82 | { | |
83 | return (pdregr(data) & HYDRA_SCLK) != 0; | |
84 | } | |
85 | ||
86 | static int hydra_bit_getsda(void *data) | |
87 | { | |
88 | return (pdregr(data) & HYDRA_SDAT) != 0; | |
89 | } | |
90 | ||
91 | /* ------------------------------------------------------------------------ */ | |
92 | ||
93 | static struct i2c_algo_bit_data hydra_bit_data = { | |
94 | .setsda = hydra_bit_setsda, | |
95 | .setscl = hydra_bit_setscl, | |
96 | .getsda = hydra_bit_getsda, | |
97 | .getscl = hydra_bit_getscl, | |
98 | .udelay = 5, | |
1da177e4 LT |
99 | .timeout = HZ |
100 | }; | |
101 | ||
102 | static struct i2c_adapter hydra_adap = { | |
103 | .owner = THIS_MODULE, | |
104 | .name = "Hydra i2c", | |
1da177e4 LT |
105 | .algo_data = &hydra_bit_data, |
106 | }; | |
107 | ||
4111ecd2 | 108 | static const struct pci_device_id hydra_ids[] = { |
1da177e4 LT |
109 | { PCI_DEVICE(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_HYDRA) }, |
110 | { 0, } | |
111 | }; | |
112 | ||
113 | MODULE_DEVICE_TABLE (pci, hydra_ids); | |
114 | ||
115 | static int __devinit hydra_probe(struct pci_dev *dev, | |
116 | const struct pci_device_id *id) | |
117 | { | |
118 | unsigned long base = pci_resource_start(dev, 0); | |
119 | int res; | |
120 | ||
121 | if (!request_mem_region(base+offsetof(struct Hydra, CachePD), 4, | |
122 | hydra_adap.name)) | |
123 | return -EBUSY; | |
124 | ||
c7a5f22d | 125 | hydra_bit_data.data = pci_ioremap_bar(dev, 0); |
1da177e4 LT |
126 | if (hydra_bit_data.data == NULL) { |
127 | release_mem_region(base+offsetof(struct Hydra, CachePD), 4); | |
128 | return -ENODEV; | |
129 | } | |
130 | ||
131 | pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */ | |
132 | hydra_adap.dev.parent = &dev->dev; | |
133 | res = i2c_bit_add_bus(&hydra_adap); | |
134 | if (res < 0) { | |
135 | iounmap(hydra_bit_data.data); | |
136 | release_mem_region(base+offsetof(struct Hydra, CachePD), 4); | |
137 | return res; | |
138 | } | |
139 | return 0; | |
140 | } | |
141 | ||
142 | static void __devexit hydra_remove(struct pci_dev *dev) | |
143 | { | |
144 | pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */ | |
3269711b | 145 | i2c_del_adapter(&hydra_adap); |
1da177e4 LT |
146 | iounmap(hydra_bit_data.data); |
147 | release_mem_region(pci_resource_start(dev, 0)+ | |
148 | offsetof(struct Hydra, CachePD), 4); | |
149 | } | |
150 | ||
151 | ||
152 | static struct pci_driver hydra_driver = { | |
153 | .name = "hydra_smbus", | |
154 | .id_table = hydra_ids, | |
155 | .probe = hydra_probe, | |
156 | .remove = __devexit_p(hydra_remove), | |
157 | }; | |
158 | ||
159 | static int __init i2c_hydra_init(void) | |
160 | { | |
161 | return pci_register_driver(&hydra_driver); | |
162 | } | |
163 | ||
164 | ||
165 | static void __exit i2c_hydra_exit(void) | |
166 | { | |
167 | pci_unregister_driver(&hydra_driver); | |
168 | } | |
169 | ||
170 | ||
171 | ||
172 | MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>"); | |
173 | MODULE_DESCRIPTION("i2c for Apple Hydra Mac I/O"); | |
174 | MODULE_LICENSE("GPL"); | |
175 | ||
176 | module_init(i2c_hydra_init); | |
177 | module_exit(i2c_hydra_exit); | |
178 |