f4dee3cf613e0fdbedeaa7a86cd4e595a9a74c17
[openwrt/openwrt.git] / target / linux / au1000-2.6 / patches / 010-au100_gpio_i2c.patch
1 diff -urN linux-2.6.19/drivers/i2c/busses/Kconfig linux-2.6.19.new/drivers/i2c/busses/Kconfig
2 --- linux-2.6.19/drivers/i2c/busses/Kconfig 2006-11-29 22:57:37.000000000 +0100
3 +++ linux-2.6.19.new/drivers/i2c/busses/Kconfig 2006-12-28 17:04:34.000000000 +0100
4 @@ -84,6 +84,17 @@
5 This driver can also be built as a module. If so, the module
6 will be called i2c-au1550.
7
8 +config I2C_AU1X00GPIO
9 + tristate "Au1x00 i2c using GPIO pins"
10 + depends on I2C
11 + select I2C_ALGOBIT
12 + help
13 + If you say yest to this option, support will be included for the
14 + Au1x00 GPIO interface.
15 +
16 + This driver can also be built as a module. If so, the module
17 + will be called i2c-au1x00gpio.
18 +
19 config I2C_ELEKTOR
20 tristate "Elektor ISA card"
21 depends on I2C && ISA && BROKEN_ON_SMP
22 diff -urN linux-2.6.19/drivers/i2c/busses/Makefile linux-2.6.19.new/drivers/i2c/busses/Makefile
23 --- linux-2.6.19/drivers/i2c/busses/Makefile 2006-11-29 22:57:37.000000000 +0100
24 +++ linux-2.6.19.new/drivers/i2c/busses/Makefile 2006-12-28 03:07:37.000000000 +0100
25 @@ -9,6 +9,7 @@
26 obj-$(CONFIG_I2C_AMD756_S4882) += i2c-amd756-s4882.o
27 obj-$(CONFIG_I2C_AMD8111) += i2c-amd8111.o
28 obj-$(CONFIG_I2C_AU1550) += i2c-au1550.o
29 +obj-$(CONFIG_I2C_AU1X00GPIO) += i2c-au1x00gpio.o
30 obj-$(CONFIG_I2C_ELEKTOR) += i2c-elektor.o
31 obj-$(CONFIG_I2C_HYDRA) += i2c-hydra.o
32 obj-$(CONFIG_I2C_I801) += i2c-i801.o
33 diff -urN linux-2.6.19/drivers/i2c/busses/i2c-au1x00gpio.c linux-2.6.19.new/drivers/i2c/busses/i2c-au1x00gpio.c
34 --- linux-2.6.19/drivers/i2c/busses/i2c-au1x00gpio.c 1970-01-01 01:00:00.000000000 +0100
35 +++ linux-2.6.19.new/drivers/i2c/busses/i2c-au1x00gpio.c 2006-12-28 17:02:10.000000000 +0100
36 @@ -0,0 +1,421 @@
37 +/* ------------------------------------------------------------------------- */
38 +/* i2c-au1x00gpio.c i2c-hw access for Au1x00 GPIO pins. */
39 +/* ------------------------------------------------------------------------- */
40 +/* Copyright (C) 1995-2000 Michael Stickel
41 +
42 + This program is free software; you can redistribute it and/or modify
43 + it under the terms of the GNU General Public License as published by
44 + the Free Software Foundation; either version 2 of the License, or
45 + (at your option) any later version.
46 +
47 + This program is distributed in the hope that it will be useful,
48 + but WITHOUT ANY WARRANTY; without even the implied warranty of
49 + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
50 + GNU General Public License for more details.
51 +
52 + You should have received a copy of the GNU General Public License
53 + along with this program; if not, write to the Free Software
54 + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
55 +/* ------------------------------------------------------------------------- */
56 +
57 +/* With some changes from Ky�stialkki <kmalkki@cc.hut.fi> and even
58 + Frodo Looijaard <frodol@dds.nl>
59 + Simon G. Vogl
60 +*/
61 +
62 +/* $Id: i2c-au1x00gpio.c,v 1.1.1.2 2004/01/22 15:35:47 br1 Exp $ */
63 +
64 +#include <linux/module.h>
65 +#include <linux/types.h>
66 +#include <linux/kernel.h>
67 +#include <linux/init.h>
68 +#include <linux/stddef.h>
69 +#include <linux/ioport.h>
70 +#include <asm/uaccess.h>
71 +#include <asm/io.h>
72 +#include <asm-mips/mach-au1x00/au1000.h>
73 +#include <asm-mips/mach-au1x00/au1000_gpio.h>
74 +
75 +#include <linux/slab.h>
76 +#include <linux/mm.h>
77 +
78 +#include <linux/i2c.h>
79 +#include <linux/i2c-algo-bit.h>
80 +
81 +#ifndef __exit
82 +#define __exit __init
83 +#endif
84 +
85 +
86 +struct i2c_au1x00gpio
87 +{
88 + struct i2c_au1x00gpio *next;
89 +
90 + short scl_gpio;
91 + short sda_gpio;
92 +
93 + unsigned long scl_mask;
94 + unsigned long sda_mask;
95 +
96 + struct i2c_adapter adapter;
97 + struct i2c_algo_bit_data bit_au1x00gpio_data;
98 +};
99 +
100 +static struct i2c_au1x00gpio *adapter_list;
101 +
102 +
103 +
104 +/* ----- global defines ----------------------------------------------- */
105 +#define DEB(x) /* should be reasonable open, close &c. */
106 +#define DEB2(x) /* low level debugging - very slow */
107 +#define DEBE(x) x /* error messages */
108 +
109 +/* ----- printer port defines ------------------------------------------*/
110 +
111 +/* ----- local functions ---------------------------------------------- */
112 +
113 +
114 +//-- Primary GPIO
115 +static void bit_au1x00gpio_setscl(void *data, int state)
116 +{
117 + struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
118 + if (state)
119 + au_writel(adapter->scl_mask, SYS_TRIOUTCLR); // Disable Driver: Switch off Transistor => 1
120 + else
121 + au_writel(adapter->scl_mask, SYS_OUTPUTCLR); // Clear Output and switch on Transistor => 0
122 +}
123 +
124 +
125 +static void bit_au1x00gpio_setsda(void *data, int state)
126 +{
127 + struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
128 + if (state)
129 + au_writel(adapter->sda_mask, SYS_TRIOUTCLR);
130 + else
131 + au_writel(adapter->sda_mask, SYS_OUTPUTCLR);
132 +}
133 +
134 +
135 +static int bit_au1x00gpio_getscl(void *data)
136 +{
137 + struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
138 + return (au_readl(SYS_PINSTATERD) & adapter->scl_mask) ? 1 : 0;
139 +}
140 +
141 +
142 +static int bit_au1x00gpio_getsda(void *data)
143 +{
144 + struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
145 + return (au_readl(SYS_PINSTATERD) & adapter->sda_mask) ? 1 : 0;
146 +}
147 +
148 +
149 +
150 +
151 +/*--
152 + *-- Functions for accessing GPIO-2
153 + *--
154 + */
155 +static void bit_au1x00gpio2_setscl(void *data, int state)
156 +{
157 + struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
158 + if (state)
159 + {
160 + au_writel(au_readl(GPIO2_DIR) & ~adapter->scl_mask, GPIO2_DIR);
161 + }
162 + else
163 + {
164 + au_writel(au_readl(GPIO2_OUTPUT) & ~adapter->scl_mask, GPIO2_OUTPUT);
165 + au_writel(au_readl(GPIO2_DIR) | adapter->scl_mask, GPIO2_DIR);
166 + }
167 +}
168 +
169 +static void bit_au1x00gpio2_setsda(void *data, int state)
170 +{
171 + struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
172 + if (state)
173 + {
174 + au_writel(au_readl(GPIO2_DIR) & ~adapter->sda_mask, GPIO2_DIR);
175 + }
176 + else
177 + {
178 + au_writel(au_readl(GPIO2_OUTPUT) & ~adapter->sda_mask, GPIO2_OUTPUT);
179 + au_writel(au_readl(GPIO2_DIR) | adapter->sda_mask, GPIO2_DIR);
180 + }
181 +}
182 +
183 +static int bit_au1x00gpio2_getscl(void *data)
184 +{
185 + struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
186 + return (au_readl(GPIO2_PINSTATE) & adapter->scl_mask) ? 1 : 0;
187 +}
188 +
189 +static int bit_au1x00gpio2_getsda(void *data)
190 +{
191 + struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
192 + return (au_readl(GPIO2_PINSTATE) & adapter->sda_mask) ? 1 : 0;
193 +}
194 +
195 +
196 +
197 +static int check_i2c_au1x00gpio_adapter(struct i2c_au1x00gpio *adapter)
198 +{
199 + int state = 0;
200 +
201 + adapter->bit_au1x00gpio_data.setsda (adapter, 1);
202 + adapter->bit_au1x00gpio_data.setscl (adapter, 1);
203 +
204 + if (adapter->bit_au1x00gpio_data.getsda(adapter)==0)
205 + {
206 + printk ("i2c-au1x00gpio: sda line should read 1 but reads 0\n");
207 + state = -1;
208 + }
209 + if (adapter->bit_au1x00gpio_data.getscl(adapter)==0)
210 + {
211 + printk ("i2c-au1x00gpio: scl line should read 1 but reads 0\n");
212 + state = -1;
213 + }
214 +
215 +
216 + adapter->bit_au1x00gpio_data.setsda (adapter, 0);
217 + adapter->bit_au1x00gpio_data.setscl (adapter, 0);
218 +
219 + if (adapter->bit_au1x00gpio_data.getsda(adapter)==1)
220 + {
221 + printk ("i2c-au1x00gpio: sda line should read 0 but reads 1\n");
222 + state = -1;
223 + }
224 + if (adapter->bit_au1x00gpio_data.getscl(adapter)==1)
225 + {
226 + printk ("i2c-au1x00gpio: scl line should read 0 but reads 1\n");
227 + state = -1;
228 + }
229 +
230 + if (state==0)
231 + printk ("i2c-au1x00gpio: adapter with scl=GPIO%d,sda=GPIO%d is working\n",
232 + adapter->scl_gpio, adapter->sda_gpio
233 + );
234 + return state;
235 +}
236 +
237 +
238 +
239 +#if 0
240 +static int bit_au1x00gpio_reg(struct i2c_client *client)
241 +{
242 + return 0;
243 +}
244 +
245 +static int bit_au1x00gpio_unreg(struct i2c_client *client)
246 +{
247 + return 0;
248 +}
249 +
250 +static void bit_au1x00gpio_inc_use(struct i2c_adapter *adap)
251 +{
252 + MOD_INC_USE_COUNT;
253 +}
254 +
255 +static void bit_au1x00gpio_dec_use(struct i2c_adapter *adap)
256 +{
257 + MOD_DEC_USE_COUNT;
258 +}
259 +#endif
260 +
261 +
262 +
263 +static struct i2c_algo_bit_data bit_au1x00gpio_data = {
264 + .data = NULL,
265 + .setsda = bit_au1x00gpio_setsda,
266 + .setscl = bit_au1x00gpio_setscl,
267 + .getsda = bit_au1x00gpio_getsda,
268 + .getscl = bit_au1x00gpio_getscl,
269 + .udelay = 80,
270 + .timeout = HZ,
271 +};
272 +
273 +
274 +static struct i2c_adapter bit_au1x00gpio_ops = {
275 + .owner = THIS_MODULE,
276 + .name = "Au1x00 GPIO I2C adapter",
277 + .id = I2C_HW_B_AU1x00GPIO,
278 +};
279 +
280 +
281 +
282 +/*
283 + * scl_gpio:
284 + * 0..31 for primary GPIO's
285 + * 200..215 for secondary GPIO's
286 + *
287 + * sda_gpio:
288 + * 0..31 for primary GPIO's
289 + * 200..215 for secondary GPIO's
290 + *
291 + * You can even mix primary and secondary GPIO's.
292 + * E.g.: i2c_au1x00gpio_create(4,206);
293 + */
294 +
295 +static int i2c_au1x00gpio_create (int scl_gpio, int sda_gpio)
296 +{
297 + if ((scl_gpio < 32 || (scl_gpio >= 200 && scl_gpio <= 215)) &&
298 + (scl_gpio < 32 || (scl_gpio >= 200 && scl_gpio <= 215)))
299 + {
300 + struct i2c_au1x00gpio *adapter = kmalloc(sizeof(struct i2c_au1x00gpio),
301 + GFP_KERNEL);
302 + if (!adapter) {
303 + printk(KERN_ERR "i2c-au1x00-gpio: Unable to malloc.\n");
304 + return -1;
305 + }
306 +
307 + printk(KERN_DEBUG "i2c-au1x00-gpio.o: attaching to SCL=GPIO%d, SDA=GPIO%d\n",
308 + scl_gpio, sda_gpio);
309 +
310 + memset (adapter, 0, sizeof(struct i2c_au1x00gpio));
311 +
312 + adapter->adapter = bit_au1x00gpio_ops;
313 +
314 + adapter->adapter.algo_data = &adapter->bit_au1x00gpio_data;
315 + adapter->bit_au1x00gpio_data = bit_au1x00gpio_data;
316 + adapter->bit_au1x00gpio_data.data = adapter;
317 +
318 + adapter->bit_au1x00gpio_data.data = adapter;
319 +
320 + adapter->scl_gpio = scl_gpio;
321 + adapter->sda_gpio = sda_gpio;
322 +
323 + if (sda_gpio < 32)
324 + {
325 + adapter->bit_au1x00gpio_data.setsda = bit_au1x00gpio_setsda;
326 + adapter->bit_au1x00gpio_data.getsda = bit_au1x00gpio_getsda;
327 + adapter->sda_mask = 1<<sda_gpio;
328 + }
329 + else if (sda_gpio >= 200 && sda_gpio <= 215)
330 + {
331 + adapter->bit_au1x00gpio_data.setsda = bit_au1x00gpio2_setsda;
332 + adapter->bit_au1x00gpio_data.getsda = bit_au1x00gpio2_getsda;
333 + adapter->sda_mask = 1<<(sda_gpio-200);
334 + }
335 +
336 +
337 + if (scl_gpio < 32)
338 + {
339 + adapter->bit_au1x00gpio_data.setscl = bit_au1x00gpio_setscl;
340 + adapter->bit_au1x00gpio_data.getscl = bit_au1x00gpio_getscl;
341 + adapter->scl_mask = 1<<scl_gpio;
342 + }
343 + else if (scl_gpio >= 200 && scl_gpio <= 215)
344 + {
345 + adapter->bit_au1x00gpio_data.setscl = bit_au1x00gpio2_setscl;
346 + adapter->bit_au1x00gpio_data.getscl = bit_au1x00gpio2_getscl;
347 + adapter->scl_mask = 1<<(scl_gpio-200);
348 + }
349 +
350 + au_writel(0L, SYS_PININPUTEN);
351 + if (check_i2c_au1x00gpio_adapter(adapter)==0)
352 + {
353 + adapter->bit_au1x00gpio_data.setsda (adapter, 1);
354 + adapter->bit_au1x00gpio_data.setscl (adapter, 1);
355 +
356 + if (i2c_bit_add_bus(&adapter->adapter) < 0)
357 + {
358 + printk(KERN_ERR "i2c-au1x00-gpio: Unable to register with I2C.\n");
359 + kfree(adapter);
360 + return -1; /* No good */
361 + }
362 +
363 + adapter->next = adapter_list;
364 + adapter_list = adapter;
365 + return 0;
366 + }
367 + }
368 + else
369 + printk(KERN_ERR "i2c-au1x00-gpio: Invalid argument scl_gpio=%d, sda_gpio=%d.\n", scl_gpio, sda_gpio);
370 + return -1;
371 +}
372 +
373 +
374 +
375 +static void i2c_au1x00gpio_delete (int scl_gpio, int sda_gpio)
376 +{
377 + struct i2c_au1x00gpio *adapter, *prev = NULL;
378 +
379 + for (adapter = adapter_list; adapter; adapter = adapter->next)
380 + {
381 + if (adapter->scl_gpio == scl_gpio &&
382 + adapter->sda_gpio == sda_gpio)
383 + {
384 + i2c_bit_del_bus(&adapter->adapter);
385 + if (prev)
386 + prev->next = adapter->next;
387 + else
388 + adapter_list = adapter->next;
389 + kfree(adapter);
390 + return;
391 + }
392 + prev = adapter;
393 + }
394 +}
395 +
396 +
397 +
398 +
399 +
400 +#ifndef CONFIG_I2C_AU1X00GPIO_SCL
401 +#define CONFIG_I2C_AU1X00GPIO_SCL (216)
402 +#endif
403 +
404 +#ifndef CONFIG_I2C_AU1X00GPIO_SDA
405 +#define CONFIG_I2C_AU1X00GPIO_SDA (217)
406 +#endif
407 +
408 +static int au1x00gpiopin_scl = CONFIG_I2C_AU1X00GPIO_SCL;
409 +static int au1x00gpiopin_sda = CONFIG_I2C_AU1X00GPIO_SDA;
410 +
411 +
412 +
413 +int __init i2c_bit_au1x00gpio_init(void)
414 +{
415 + printk(KERN_INFO "i2c-au1x00gpio.o: i2c Au1x00 GPIO adapter module version\n");
416 +
417 + if (i2c_au1x00gpio_create (au1x00gpiopin_scl, au1x00gpiopin_sda) == 0)
418 + {
419 + printk(KERN_INFO "i2c-au1x00gpio.o: registered I2C-Bus for GPIO%d,GPIO%d\n",
420 + au1x00gpiopin_scl, au1x00gpiopin_sda
421 + );
422 + return 0;
423 + }
424 + printk(KERN_INFO "i2c-au1x00gpio.o: failed to register I2C-Bus for GPIO%d,GPIO%d\n",
425 + au1x00gpiopin_scl, au1x00gpiopin_sda
426 + );
427 + return -1;
428 +}
429 +
430 +
431 +void __exit i2c_bit_au1x00gpio_exit(void)
432 +{
433 + i2c_au1x00gpio_delete (au1x00gpiopin_scl, au1x00gpiopin_sda);
434 +}
435 +
436 +module_param(au1x00gpiopin_scl, int, 0644);
437 +MODULE_PARM_DESC(au1x00gpiopin_scl, "GPIO pin number used for SCL pin.");
438 +
439 +module_param(au1x00gpiopin_sda, int, 0644);
440 +MODULE_PARM_DESC(au1x00gpiopin_sda, "GPIO pin number used for SDA pin.");
441 +
442 +MODULE_AUTHOR("Michael Stickel <michael@cubic.org>");
443 +MODULE_DESCRIPTION("I2C-Bus adapter routines for Au1x00 GPIO adapter.");
444 +MODULE_LICENSE("GPL");
445 +
446 +
447 +#ifdef MODULE
448 +int init_module(void)
449 +{
450 + return i2c_bit_au1x00gpio_init();
451 +}
452 +
453 +void cleanup_module(void)
454 +{
455 + i2c_bit_au1x00gpio_exit();
456 +}
457 +#endif
458 diff -urN linux-2.6.19/include/linux/i2c-id.h linux-2.6.19.new/include/linux/i2c-id.h
459 --- linux-2.6.19/include/linux/i2c-id.h 2006-11-29 22:57:37.000000000 +0100
460 +++ linux-2.6.19.new/include/linux/i2c-id.h 2006-12-28 03:12:15.000000000 +0100
461 @@ -231,6 +231,9 @@
462 /* --- Au1550 PSC adapters adapters */
463 #define I2C_HW_AU1550_PSC 0x1b0000
464
465 +/* --- Au1x00 i2c GPIO adapter */
466 +#define I2C_HW_B_AU1x00GPIO 0x1b
467 +
468 /* --- SMBus only adapters */
469 #define I2C_HW_SMBUS_PIIX4 0x040000
470 #define I2C_HW_SMBUS_ALI15X3 0x040001