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a28d3af2 BH |
1 | /* |
2 | i2c Support for Apple SMU Controller | |
3 | ||
4 | Copyright (c) 2005 Benjamin Herrenschmidt, IBM Corp. | |
5 | <benh@kernel.crashing.org> | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | ||
21 | */ | |
22 | ||
a28d3af2 BH |
23 | #include <linux/module.h> |
24 | #include <linux/kernel.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/i2c.h> | |
27 | #include <linux/init.h> | |
a28d3af2 BH |
28 | #include <linux/device.h> |
29 | #include <linux/platform_device.h> | |
30 | #include <asm/prom.h> | |
31 | #include <asm/pmac_low_i2c.h> | |
32 | ||
33 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
34 | MODULE_DESCRIPTION("I2C driver for Apple PowerMac"); | |
35 | MODULE_LICENSE("GPL"); | |
36 | ||
37 | /* | |
38 | * SMBUS-type transfer entrypoint | |
39 | */ | |
40 | static s32 i2c_powermac_smbus_xfer( struct i2c_adapter* adap, | |
41 | u16 addr, | |
42 | unsigned short flags, | |
43 | char read_write, | |
44 | u8 command, | |
45 | int size, | |
46 | union i2c_smbus_data* data) | |
47 | { | |
48 | struct pmac_i2c_bus *bus = i2c_get_adapdata(adap); | |
49 | int rc = 0; | |
50 | int read = (read_write == I2C_SMBUS_READ); | |
51 | int addrdir = (addr << 1) | read; | |
52 | u8 local[2]; | |
53 | ||
54 | rc = pmac_i2c_open(bus, 0); | |
55 | if (rc) | |
56 | return rc; | |
57 | ||
58 | switch (size) { | |
59 | case I2C_SMBUS_QUICK: | |
60 | rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std); | |
61 | if (rc) | |
62 | goto bail; | |
63 | rc = pmac_i2c_xfer(bus, addrdir, 0, 0, NULL, 0); | |
64 | break; | |
65 | case I2C_SMBUS_BYTE: | |
66 | rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std); | |
67 | if (rc) | |
68 | goto bail; | |
69 | rc = pmac_i2c_xfer(bus, addrdir, 0, 0, &data->byte, 1); | |
70 | break; | |
71 | case I2C_SMBUS_BYTE_DATA: | |
72 | rc = pmac_i2c_setmode(bus, read ? | |
73 | pmac_i2c_mode_combined : | |
74 | pmac_i2c_mode_stdsub); | |
75 | if (rc) | |
76 | goto bail; | |
77 | rc = pmac_i2c_xfer(bus, addrdir, 1, command, &data->byte, 1); | |
78 | break; | |
79 | case I2C_SMBUS_WORD_DATA: | |
80 | rc = pmac_i2c_setmode(bus, read ? | |
81 | pmac_i2c_mode_combined : | |
82 | pmac_i2c_mode_stdsub); | |
83 | if (rc) | |
84 | goto bail; | |
85 | if (!read) { | |
86 | local[0] = data->word & 0xff; | |
87 | local[1] = (data->word >> 8) & 0xff; | |
88 | } | |
89 | rc = pmac_i2c_xfer(bus, addrdir, 1, command, local, 2); | |
90 | if (rc == 0 && read) { | |
91 | data->word = ((u16)local[1]) << 8; | |
92 | data->word |= local[0]; | |
93 | } | |
94 | break; | |
95 | ||
96 | /* Note that these are broken vs. the expected smbus API where | |
97 | * on reads, the lenght is actually returned from the function, | |
98 | * but I think the current API makes no sense and I don't want | |
99 | * any driver that I haven't verified for correctness to go | |
100 | * anywhere near a pmac i2c bus anyway ... | |
101 | * | |
102 | * I'm also not completely sure what kind of phases to do between | |
103 | * the actual command and the data (what I am _supposed_ to do that | |
104 | * is). For now, I assume writes are a single stream and reads have | |
105 | * a repeat start/addr phase (but not stop in between) | |
106 | */ | |
107 | case I2C_SMBUS_BLOCK_DATA: | |
108 | rc = pmac_i2c_setmode(bus, read ? | |
109 | pmac_i2c_mode_combined : | |
110 | pmac_i2c_mode_stdsub); | |
111 | if (rc) | |
112 | goto bail; | |
113 | rc = pmac_i2c_xfer(bus, addrdir, 1, command, data->block, | |
114 | data->block[0] + 1); | |
115 | ||
116 | break; | |
117 | case I2C_SMBUS_I2C_BLOCK_DATA: | |
118 | rc = pmac_i2c_setmode(bus, read ? | |
119 | pmac_i2c_mode_combined : | |
120 | pmac_i2c_mode_stdsub); | |
121 | if (rc) | |
122 | goto bail; | |
123 | rc = pmac_i2c_xfer(bus, addrdir, 1, command, | |
4b2643d7 | 124 | &data->block[1], data->block[0]); |
a28d3af2 BH |
125 | break; |
126 | ||
127 | default: | |
128 | rc = -EINVAL; | |
129 | } | |
130 | bail: | |
131 | pmac_i2c_close(bus); | |
132 | return rc; | |
133 | } | |
134 | ||
135 | /* | |
136 | * Generic i2c master transfer entrypoint. This driver only support single | |
137 | * messages (for "lame i2c" transfers). Anything else should use the smbus | |
138 | * entry point | |
139 | */ | |
140 | static int i2c_powermac_master_xfer( struct i2c_adapter *adap, | |
141 | struct i2c_msg *msgs, | |
142 | int num) | |
143 | { | |
144 | struct pmac_i2c_bus *bus = i2c_get_adapdata(adap); | |
145 | int rc = 0; | |
146 | int read; | |
147 | int addrdir; | |
148 | ||
a28d3af2 BH |
149 | if (msgs->flags & I2C_M_TEN) |
150 | return -EINVAL; | |
151 | read = (msgs->flags & I2C_M_RD) != 0; | |
152 | addrdir = (msgs->addr << 1) | read; | |
153 | if (msgs->flags & I2C_M_REV_DIR_ADDR) | |
154 | addrdir ^= 1; | |
155 | ||
156 | rc = pmac_i2c_open(bus, 0); | |
157 | if (rc) | |
158 | return rc; | |
159 | rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std); | |
160 | if (rc) | |
161 | goto bail; | |
162 | rc = pmac_i2c_xfer(bus, addrdir, 0, 0, msgs->buf, msgs->len); | |
163 | bail: | |
164 | pmac_i2c_close(bus); | |
8ced8eee | 165 | return rc < 0 ? rc : 1; |
a28d3af2 BH |
166 | } |
167 | ||
168 | static u32 i2c_powermac_func(struct i2c_adapter * adapter) | |
169 | { | |
170 | return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | | |
171 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | | |
172 | I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_I2C; | |
173 | } | |
174 | ||
175 | /* For now, we only handle smbus */ | |
8f9082c5 | 176 | static const struct i2c_algorithm i2c_powermac_algorithm = { |
a28d3af2 BH |
177 | .smbus_xfer = i2c_powermac_smbus_xfer, |
178 | .master_xfer = i2c_powermac_master_xfer, | |
179 | .functionality = i2c_powermac_func, | |
180 | }; | |
181 | ||
182 | ||
9f2545c1 | 183 | static int i2c_powermac_remove(struct platform_device *dev) |
a28d3af2 | 184 | { |
9f2545c1 | 185 | struct i2c_adapter *adapter = platform_get_drvdata(dev); |
a28d3af2 BH |
186 | struct pmac_i2c_bus *bus = i2c_get_adapdata(adapter); |
187 | int rc; | |
188 | ||
189 | rc = i2c_del_adapter(adapter); | |
190 | pmac_i2c_detach_adapter(bus, adapter); | |
191 | i2c_set_adapdata(adapter, NULL); | |
192 | /* We aren't that prepared to deal with this... */ | |
193 | if (rc) | |
194 | printk("i2c-powermac.c: Failed to remove bus %s !\n", | |
195 | adapter->name); | |
9f2545c1 | 196 | platform_set_drvdata(dev, NULL); |
a28d3af2 BH |
197 | kfree(adapter); |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | ||
9f2545c1 | 203 | static int __devexit i2c_powermac_probe(struct platform_device *dev) |
a28d3af2 | 204 | { |
9f2545c1 | 205 | struct pmac_i2c_bus *bus = dev->dev.platform_data; |
a28d3af2 BH |
206 | struct device_node *parent = NULL; |
207 | struct i2c_adapter *adapter; | |
018a3d1d JK |
208 | char name[32]; |
209 | const char *basename; | |
a28d3af2 BH |
210 | int rc; |
211 | ||
212 | if (bus == NULL) | |
213 | return -EINVAL; | |
214 | ||
215 | /* Ok, now we need to make up a name for the interface that will | |
216 | * match what we used to do in the past, that is basically the | |
217 | * controller's parent device node for keywest. PMU didn't have a | |
218 | * naming convention and SMU has a different one | |
219 | */ | |
220 | switch(pmac_i2c_get_type(bus)) { | |
221 | case pmac_i2c_bus_keywest: | |
222 | parent = of_get_parent(pmac_i2c_get_controller(bus)); | |
223 | if (parent == NULL) | |
224 | return -EINVAL; | |
225 | basename = parent->name; | |
226 | break; | |
227 | case pmac_i2c_bus_pmu: | |
228 | basename = "pmu"; | |
229 | break; | |
230 | case pmac_i2c_bus_smu: | |
231 | /* This is not what we used to do but I'm fixing drivers at | |
232 | * the same time as this change | |
233 | */ | |
234 | basename = "smu"; | |
235 | break; | |
236 | default: | |
237 | return -EINVAL; | |
238 | } | |
239 | snprintf(name, 32, "%s %d", basename, pmac_i2c_get_channel(bus)); | |
240 | of_node_put(parent); | |
241 | ||
242 | adapter = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL); | |
243 | if (adapter == NULL) { | |
244 | printk(KERN_ERR "i2c-powermac: can't allocate inteface !\n"); | |
245 | return -ENOMEM; | |
246 | } | |
9f2545c1 | 247 | platform_set_drvdata(dev, adapter); |
a28d3af2 BH |
248 | strcpy(adapter->name, name); |
249 | adapter->algo = &i2c_powermac_algorithm; | |
250 | i2c_set_adapdata(adapter, bus); | |
9f2545c1 | 251 | adapter->dev.parent = &dev->dev; |
a28d3af2 BH |
252 | pmac_i2c_attach_adapter(bus, adapter); |
253 | rc = i2c_add_adapter(adapter); | |
254 | if (rc) { | |
255 | printk(KERN_ERR "i2c-powermac: Adapter %s registration " | |
256 | "failed\n", name); | |
257 | i2c_set_adapdata(adapter, NULL); | |
258 | pmac_i2c_detach_adapter(bus, adapter); | |
259 | } | |
260 | ||
261 | printk(KERN_INFO "PowerMac i2c bus %s registered\n", name); | |
262 | return rc; | |
263 | } | |
264 | ||
265 | ||
9f2545c1 | 266 | static struct platform_driver i2c_powermac_driver = { |
a28d3af2 | 267 | .probe = i2c_powermac_probe, |
9f2545c1 BH |
268 | .remove = __devexit_p(i2c_powermac_remove), |
269 | .driver = { | |
270 | .name = "i2c-powermac", | |
271 | .bus = &platform_bus_type, | |
272 | }, | |
a28d3af2 BH |
273 | }; |
274 | ||
275 | static int __init i2c_powermac_init(void) | |
276 | { | |
9f2545c1 | 277 | platform_driver_register(&i2c_powermac_driver); |
a28d3af2 BH |
278 | return 0; |
279 | } | |
280 | ||
281 | ||
282 | static void __exit i2c_powermac_cleanup(void) | |
283 | { | |
9f2545c1 | 284 | platform_driver_unregister(&i2c_powermac_driver); |
a28d3af2 BH |
285 | } |
286 | ||
287 | module_init(i2c_powermac_init); | |
288 | module_exit(i2c_powermac_cleanup); |