ki2c.c revision 1.3 1 1.3 macallan /* $NetBSD: ki2c.c,v 1.3 2005/08/10 14:26:46 macallan Exp $ */
2 1.1 grant /* Id: ki2c.c,v 1.7 2002/10/05 09:56:05 tsubai Exp */
3 1.1 grant
4 1.1 grant /*-
5 1.1 grant * Copyright (c) 2001 Tsubai Masanari. All rights reserved.
6 1.1 grant *
7 1.1 grant * Redistribution and use in source and binary forms, with or without
8 1.1 grant * modification, are permitted provided that the following conditions
9 1.1 grant * are met:
10 1.1 grant * 1. Redistributions of source code must retain the above copyright
11 1.1 grant * notice, this list of conditions and the following disclaimer.
12 1.1 grant * 2. Redistributions in binary form must reproduce the above copyright
13 1.1 grant * notice, this list of conditions and the following disclaimer in the
14 1.1 grant * documentation and/or other materials provided with the distribution.
15 1.1 grant * 3. The name of the author may not be used to endorse or promote products
16 1.1 grant * derived from this software without specific prior written permission.
17 1.1 grant *
18 1.1 grant * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 1.1 grant * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 1.1 grant * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 1.1 grant * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 1.1 grant * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 1.1 grant * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 1.1 grant * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 1.1 grant * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 1.1 grant * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 1.1 grant * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 1.1 grant */
29 1.1 grant
30 1.1 grant #include <sys/param.h>
31 1.1 grant #include <sys/device.h>
32 1.1 grant #include <sys/systm.h>
33 1.1 grant
34 1.1 grant #include <dev/ofw/openfirm.h>
35 1.1 grant #include <uvm/uvm_extern.h>
36 1.1 grant #include <machine/autoconf.h>
37 1.1 grant
38 1.3 macallan #include <macppc/dev/ki2cvar.h>
39 1.1 grant
40 1.1 grant int ki2c_match(struct device *, struct cfdata *, void *);
41 1.1 grant void ki2c_attach(struct device *, struct device *, void *);
42 1.1 grant inline u_int ki2c_readreg(struct ki2c_softc *, int);
43 1.1 grant inline void ki2c_writereg(struct ki2c_softc *, int, u_int);
44 1.1 grant u_int ki2c_getmode(struct ki2c_softc *);
45 1.1 grant void ki2c_setmode(struct ki2c_softc *, u_int);
46 1.1 grant u_int ki2c_getspeed(struct ki2c_softc *);
47 1.1 grant void ki2c_setspeed(struct ki2c_softc *, u_int);
48 1.1 grant int ki2c_intr(struct ki2c_softc *);
49 1.1 grant int ki2c_poll(struct ki2c_softc *, int);
50 1.1 grant int ki2c_start(struct ki2c_softc *, int, int, void *, int);
51 1.1 grant int ki2c_read(struct ki2c_softc *, int, int, void *, int);
52 1.3 macallan int ki2c_write(struct ki2c_softc *, int, int, void *, int);
53 1.3 macallan int ki2c_print __P((void *, const char *));
54 1.3 macallan
55 1.3 macallan /* I2C glue */
56 1.3 macallan static int ki2c_i2c_acquire_bus(void *, int);
57 1.3 macallan static void ki2c_i2c_release_bus(void *, int);
58 1.3 macallan static int ki2c_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, size_t,
59 1.3 macallan void *, size_t, int);
60 1.3 macallan
61 1.1 grant
62 1.1 grant struct cfattach ki2c_ca = {
63 1.1 grant "ki2c", {}, sizeof(struct ki2c_softc), ki2c_match, ki2c_attach
64 1.1 grant };
65 1.1 grant
66 1.1 grant int
67 1.1 grant ki2c_match(parent, match, aux)
68 1.1 grant struct device *parent;
69 1.1 grant struct cfdata *match;
70 1.1 grant void *aux;
71 1.1 grant {
72 1.1 grant struct confargs *ca = aux;
73 1.1 grant
74 1.1 grant if (strcmp(ca->ca_name, "i2c") == 0)
75 1.1 grant return 1;
76 1.1 grant
77 1.1 grant return 0;
78 1.1 grant }
79 1.1 grant
80 1.1 grant void
81 1.1 grant ki2c_attach(parent, self, aux)
82 1.1 grant struct device *parent;
83 1.1 grant struct device *self;
84 1.1 grant void *aux;
85 1.1 grant {
86 1.1 grant struct ki2c_softc *sc = (struct ki2c_softc *)self;
87 1.1 grant struct confargs *ca = aux;
88 1.1 grant int node = ca->ca_node;
89 1.3 macallan int rate, child, namelen;
90 1.3 macallan struct ki2c_confargs ka;
91 1.3 macallan struct i2cbus_attach_args iba;
92 1.3 macallan
93 1.3 macallan char name[32];
94 1.3 macallan u_int reg[20];
95 1.3 macallan
96 1.1 grant ca->ca_reg[0] += ca->ca_baseaddr;
97 1.1 grant
98 1.1 grant if (OF_getprop(node, "AAPL,i2c-rate", &rate, 4) != 4) {
99 1.1 grant printf(": cannot get i2c-rate\n");
100 1.1 grant return;
101 1.1 grant }
102 1.1 grant if (OF_getprop(node, "AAPL,address", &sc->sc_reg, 4) != 4) {
103 1.1 grant printf(": unable to find i2c address\n");
104 1.1 grant return;
105 1.1 grant }
106 1.1 grant if (OF_getprop(node, "AAPL,address-step", &sc->sc_regstep, 4) != 4) {
107 1.1 grant printf(": unable to find i2c address step\n");
108 1.1 grant return;
109 1.1 grant }
110 1.1 grant
111 1.1 grant printf("\n");
112 1.1 grant
113 1.1 grant ki2c_writereg(sc, STATUS, 0);
114 1.1 grant ki2c_writereg(sc, ISR, 0);
115 1.1 grant ki2c_writereg(sc, IER, 0);
116 1.1 grant
117 1.1 grant ki2c_setmode(sc, I2C_STDSUBMODE);
118 1.1 grant ki2c_setspeed(sc, I2C_100kHz); /* XXX rate */
119 1.3 macallan
120 1.3 macallan lockinit(&sc->sc_buslock, PRIBIO|PCATCH, sc->sc_dev.dv_xname, 0, 0);
121 1.3 macallan ki2c_writereg(sc, IER,I2C_INT_DATA|I2C_INT_ADDR|I2C_INT_STOP);
122 1.3 macallan
123 1.3 macallan /* fill in the i2c tag */
124 1.3 macallan sc->sc_i2c.ic_cookie = sc;
125 1.3 macallan sc->sc_i2c.ic_acquire_bus = ki2c_i2c_acquire_bus;
126 1.3 macallan sc->sc_i2c.ic_release_bus = ki2c_i2c_release_bus;
127 1.3 macallan sc->sc_i2c.ic_send_start = NULL;
128 1.3 macallan sc->sc_i2c.ic_send_stop = NULL;
129 1.3 macallan sc->sc_i2c.ic_initiate_xfer = NULL;
130 1.3 macallan sc->sc_i2c.ic_read_byte = NULL;
131 1.3 macallan sc->sc_i2c.ic_write_byte = NULL;
132 1.3 macallan sc->sc_i2c.ic_exec = ki2c_i2c_exec;
133 1.3 macallan
134 1.3 macallan iba.iba_name = "iic";
135 1.3 macallan iba.iba_tag = &sc->sc_i2c;
136 1.3 macallan (void) config_found(&sc->sc_dev, &iba, iicbus_print);
137 1.3 macallan
138 1.3 macallan
139 1.3 macallan for (child = OF_child(node); child; child = OF_peer(child)) {
140 1.3 macallan namelen = OF_getprop(child, "name", name, sizeof(name));
141 1.3 macallan if (namelen < 0)
142 1.3 macallan continue;
143 1.3 macallan if (namelen >= sizeof(name))
144 1.3 macallan continue;
145 1.3 macallan
146 1.3 macallan name[namelen] = 0;
147 1.3 macallan ka.ka_name = name;
148 1.3 macallan ka.ka_node = child;
149 1.3 macallan if (OF_getprop(child, "reg", reg, sizeof(reg))>0) {
150 1.3 macallan ka.ka_addr = reg[0];
151 1.3 macallan ka.ka_tag = &sc->sc_i2c;
152 1.3 macallan config_found(self, &ka, ki2c_print);
153 1.3 macallan }
154 1.3 macallan }
155 1.3 macallan }
156 1.3 macallan
157 1.3 macallan int
158 1.3 macallan ki2c_print(aux, ki2c)
159 1.3 macallan void *aux;
160 1.3 macallan const char *ki2c;
161 1.3 macallan {
162 1.3 macallan struct ki2c_confargs *ka = aux;
163 1.3 macallan
164 1.3 macallan if (ki2c) {
165 1.3 macallan aprint_normal("%s at %s", ka->ka_name, ki2c);
166 1.3 macallan aprint_normal(" address 0x%x", ka->ka_addr);
167 1.3 macallan }
168 1.3 macallan return UNCONF;
169 1.1 grant }
170 1.1 grant
171 1.1 grant u_int
172 1.1 grant ki2c_readreg(sc, reg)
173 1.1 grant struct ki2c_softc *sc;
174 1.1 grant int reg;
175 1.1 grant {
176 1.1 grant u_char *addr = sc->sc_reg + sc->sc_regstep * reg;
177 1.1 grant
178 1.1 grant return *addr;
179 1.1 grant }
180 1.1 grant
181 1.1 grant void
182 1.1 grant ki2c_writereg(sc, reg, val)
183 1.1 grant struct ki2c_softc *sc;
184 1.1 grant int reg;
185 1.1 grant u_int val;
186 1.1 grant {
187 1.1 grant u_char *addr = sc->sc_reg + sc->sc_regstep * reg;
188 1.1 grant
189 1.1 grant *addr = val;
190 1.1 grant asm volatile ("eieio");
191 1.1 grant delay(10);
192 1.1 grant }
193 1.1 grant
194 1.1 grant u_int
195 1.1 grant ki2c_getmode(sc)
196 1.1 grant struct ki2c_softc *sc;
197 1.1 grant {
198 1.1 grant return ki2c_readreg(sc, MODE) & I2C_MODE;
199 1.1 grant }
200 1.1 grant
201 1.1 grant void
202 1.1 grant ki2c_setmode(sc, mode)
203 1.1 grant struct ki2c_softc *sc;
204 1.1 grant u_int mode;
205 1.1 grant {
206 1.1 grant u_int x;
207 1.1 grant
208 1.1 grant KASSERT((mode & ~I2C_MODE) == 0);
209 1.1 grant x = ki2c_readreg(sc, MODE);
210 1.1 grant x &= ~I2C_MODE;
211 1.1 grant x |= mode;
212 1.1 grant ki2c_writereg(sc, MODE, x);
213 1.1 grant }
214 1.1 grant
215 1.1 grant u_int
216 1.1 grant ki2c_getspeed(sc)
217 1.1 grant struct ki2c_softc *sc;
218 1.1 grant {
219 1.1 grant return ki2c_readreg(sc, MODE) & I2C_SPEED;
220 1.1 grant }
221 1.1 grant
222 1.1 grant void
223 1.1 grant ki2c_setspeed(sc, speed)
224 1.1 grant struct ki2c_softc *sc;
225 1.1 grant u_int speed;
226 1.1 grant {
227 1.1 grant u_int x;
228 1.1 grant
229 1.1 grant KASSERT((speed & ~I2C_SPEED) == 0);
230 1.1 grant x = ki2c_readreg(sc, MODE);
231 1.1 grant x &= ~I2C_SPEED;
232 1.1 grant x |= speed;
233 1.1 grant ki2c_writereg(sc, MODE, x);
234 1.1 grant }
235 1.1 grant
236 1.1 grant int
237 1.1 grant ki2c_intr(sc)
238 1.1 grant struct ki2c_softc *sc;
239 1.1 grant {
240 1.1 grant u_int isr, x;
241 1.1 grant
242 1.1 grant isr = ki2c_readreg(sc, ISR);
243 1.1 grant if (isr & I2C_INT_ADDR) {
244 1.1 grant #if 0
245 1.1 grant if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) {
246 1.1 grant /* No slave responded. */
247 1.1 grant sc->sc_flags |= I2C_ERROR;
248 1.1 grant goto out;
249 1.1 grant }
250 1.1 grant #endif
251 1.1 grant
252 1.1 grant if (sc->sc_flags & I2C_READING) {
253 1.1 grant if (sc->sc_resid > 1) {
254 1.1 grant x = ki2c_readreg(sc, CONTROL);
255 1.1 grant x |= I2C_CT_AAK;
256 1.1 grant ki2c_writereg(sc, CONTROL, x);
257 1.1 grant }
258 1.1 grant } else {
259 1.1 grant ki2c_writereg(sc, DATA, *sc->sc_data++);
260 1.1 grant sc->sc_resid--;
261 1.1 grant }
262 1.1 grant }
263 1.1 grant
264 1.1 grant if (isr & I2C_INT_DATA) {
265 1.1 grant if (sc->sc_flags & I2C_READING) {
266 1.1 grant *sc->sc_data++ = ki2c_readreg(sc, DATA);
267 1.1 grant sc->sc_resid--;
268 1.1 grant
269 1.1 grant if (sc->sc_resid == 0) { /* Completed */
270 1.1 grant ki2c_writereg(sc, CONTROL, 0);
271 1.1 grant goto out;
272 1.1 grant }
273 1.1 grant } else {
274 1.1 grant #if 0
275 1.1 grant if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) {
276 1.1 grant /* No slave responded. */
277 1.1 grant sc->sc_flags |= I2C_ERROR;
278 1.1 grant goto out;
279 1.1 grant }
280 1.1 grant #endif
281 1.1 grant
282 1.1 grant if (sc->sc_resid == 0) {
283 1.1 grant x = ki2c_readreg(sc, CONTROL) | I2C_CT_STOP;
284 1.1 grant ki2c_writereg(sc, CONTROL, x);
285 1.1 grant } else {
286 1.1 grant ki2c_writereg(sc, DATA, *sc->sc_data++);
287 1.1 grant sc->sc_resid--;
288 1.1 grant }
289 1.1 grant }
290 1.1 grant }
291 1.1 grant
292 1.1 grant out:
293 1.1 grant if (isr & I2C_INT_STOP) {
294 1.1 grant ki2c_writereg(sc, CONTROL, 0);
295 1.1 grant sc->sc_flags &= ~I2C_BUSY;
296 1.1 grant }
297 1.1 grant
298 1.1 grant ki2c_writereg(sc, ISR, isr);
299 1.1 grant
300 1.1 grant return 1;
301 1.1 grant }
302 1.1 grant
303 1.1 grant int
304 1.1 grant ki2c_poll(sc, timo)
305 1.1 grant struct ki2c_softc *sc;
306 1.1 grant int timo;
307 1.1 grant {
308 1.1 grant while (sc->sc_flags & I2C_BUSY) {
309 1.1 grant if (ki2c_readreg(sc, ISR))
310 1.1 grant ki2c_intr(sc);
311 1.1 grant timo -= 100;
312 1.1 grant if (timo < 0) {
313 1.1 grant printf("i2c_poll: timeout\n");
314 1.1 grant return -1;
315 1.1 grant }
316 1.1 grant delay(100);
317 1.1 grant }
318 1.1 grant return 0;
319 1.1 grant }
320 1.1 grant
321 1.1 grant int
322 1.1 grant ki2c_start(sc, addr, subaddr, data, len)
323 1.1 grant struct ki2c_softc *sc;
324 1.1 grant int addr, subaddr, len;
325 1.1 grant void *data;
326 1.1 grant {
327 1.1 grant int rw = (sc->sc_flags & I2C_READING) ? 1 : 0;
328 1.1 grant int timo, x;
329 1.1 grant
330 1.1 grant KASSERT((addr & 1) == 0);
331 1.1 grant
332 1.1 grant sc->sc_data = data;
333 1.1 grant sc->sc_resid = len;
334 1.1 grant sc->sc_flags |= I2C_BUSY;
335 1.1 grant
336 1.1 grant timo = 1000 + len * 200;
337 1.1 grant
338 1.1 grant /* XXX TAS3001 sometimes takes 50ms to finish writing registers. */
339 1.1 grant /* if (addr == 0x68) */
340 1.1 grant timo += 100000;
341 1.1 grant
342 1.1 grant ki2c_writereg(sc, ADDR, addr | rw);
343 1.1 grant ki2c_writereg(sc, SUBADDR, subaddr);
344 1.1 grant
345 1.1 grant x = ki2c_readreg(sc, CONTROL) | I2C_CT_ADDR;
346 1.1 grant ki2c_writereg(sc, CONTROL, x);
347 1.1 grant
348 1.1 grant if (ki2c_poll(sc, timo))
349 1.1 grant return -1;
350 1.1 grant if (sc->sc_flags & I2C_ERROR) {
351 1.1 grant printf("I2C_ERROR\n");
352 1.1 grant return -1;
353 1.1 grant }
354 1.1 grant return 0;
355 1.1 grant }
356 1.1 grant
357 1.1 grant int
358 1.1 grant ki2c_read(sc, addr, subaddr, data, len)
359 1.1 grant struct ki2c_softc *sc;
360 1.1 grant int addr, subaddr, len;
361 1.1 grant void *data;
362 1.1 grant {
363 1.1 grant sc->sc_flags = I2C_READING;
364 1.3 macallan #ifdef KI2C_DEBUG
365 1.3 macallan printf("ki2c_read: %02x %d\n", addr, len);
366 1.3 macallan #endif
367 1.1 grant return ki2c_start(sc, addr, subaddr, data, len);
368 1.1 grant }
369 1.1 grant
370 1.1 grant int
371 1.1 grant ki2c_write(sc, addr, subaddr, data, len)
372 1.1 grant struct ki2c_softc *sc;
373 1.1 grant int addr, subaddr, len;
374 1.3 macallan void *data;
375 1.1 grant {
376 1.1 grant sc->sc_flags = 0;
377 1.3 macallan #ifdef KI2C_DEBUG
378 1.3 macallan printf("ki2c_write: %02x %d\n",addr,len);
379 1.3 macallan #endif
380 1.3 macallan return ki2c_start(sc, addr, subaddr, data, len);
381 1.3 macallan }
382 1.3 macallan
383 1.3 macallan static int
384 1.3 macallan ki2c_i2c_acquire_bus(void *cookie, int flags)
385 1.3 macallan {
386 1.3 macallan struct ki2c_softc *sc = cookie;
387 1.3 macallan
388 1.3 macallan return (lockmgr(&sc->sc_buslock, LK_EXCLUSIVE, NULL));
389 1.3 macallan }
390 1.3 macallan
391 1.3 macallan static void
392 1.3 macallan ki2c_i2c_release_bus(void *cookie, int flags)
393 1.3 macallan {
394 1.3 macallan struct ki2c_softc *sc = cookie;
395 1.3 macallan
396 1.3 macallan (void) lockmgr(&sc->sc_buslock, LK_RELEASE, NULL);
397 1.3 macallan }
398 1.3 macallan
399 1.3 macallan int
400 1.3 macallan ki2c_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *vcmd,
401 1.3 macallan size_t cmdlen, void *vbuf, size_t buflen, int flags)
402 1.3 macallan {
403 1.3 macallan struct ki2c_softc *sc = cookie;
404 1.3 macallan
405 1.3 macallan /* we handle the subaddress stuff ourselves */
406 1.3 macallan ki2c_setmode(sc, I2C_STDMODE);
407 1.3 macallan
408 1.3 macallan if (ki2c_write(sc, addr, 0, __UNCONST(vcmd), cmdlen) !=0 )
409 1.3 macallan return -1;
410 1.3 macallan if (I2C_OP_READ_P(op))
411 1.3 macallan {
412 1.3 macallan if (ki2c_read(sc, addr, 0, vbuf, buflen) !=0 )
413 1.3 macallan return -1;
414 1.3 macallan }
415 1.3 macallan return 0;
416 1.1 grant }
417