samsung/exynos/exynos5_i2c.c

139 clear_ipend(struct i2c_softc *sc)
143 	reg = READ1(sc, I2CCON);
145 	WRITE1(sc, I2CCON, reg);
153 	struct i2c_softc *sc;
156 	sc = device_get_softc(dev);
157 	sc->dev = dev;
159 	mtx_init(&sc->mutex, device_get_nameunit(dev), "I2C", MTX_DEF);
161 	if (bus_alloc_resources(dev, i2c_spec, sc->res)) {
167 	sc->bst = rman_get_bustag(sc->res[0]);
168 	sc->bsh = rman_get_bushandle(sc->res[0]);
170 	sc->iicbus = device_add_child(dev, "iicbus", -1);
171 	if (sc->iicbus == NULL) {
173 		mtx_destroy(&sc->mutex);
177 	WRITE1(sc, I2CSTAT, 0);
178 	WRITE1(sc, I2CADD, 0x00);
183 	WRITE1(sc, I2CSTAT, reg);
191 wait_for_iif(struct i2c_softc *sc)
198 		reg = READ1(sc, I2CCON);
209 wait_for_nibb(struct i2c_softc *sc)
215 		if ((READ1(sc, I2CSTAT) & I2CSTAT_BSY) == 0)
224 is_ack(struct i2c_softc *sc)
228 	stat = READ1(sc, I2CSTAT);
240 	struct i2c_softc *sc;
244 	sc = device_get_softc(dev);
248 	mtx_lock(&sc->mutex);
251 	DPRINTF("I2CCON == 0x%08x\n", READ1(sc, I2CCON));
252 	DPRINTF("I2CSTAT == 0x%08x\n", READ1(sc, I2CSTAT));
263 	error = wait_for_nibb(sc);
265 		mtx_unlock(&sc->mutex);
270 	reg = READ1(sc, I2CCON);
272 	WRITE1(sc, I2CCON, reg);
274 	WRITE1(sc, I2CDS, slave);
280 	WRITE1(sc, I2CSTAT, reg);
282 	error = wait_for_iif(sc);
286 		mtx_unlock(&sc->mutex);
290 	if (!is_ack(sc)) {
293 		mtx_unlock(&sc->mutex);
297 	mtx_unlock(&sc->mutex);
304 	struct i2c_softc *sc;
308 	sc = device_get_softc(dev);
312 	mtx_lock(&sc->mutex);
314 	reg = READ1(sc, I2CSTAT);
319 	WRITE1(sc, I2CSTAT, reg);
321 	clear_ipend(sc);
323 	error = wait_for_nibb(sc);
329 	mtx_unlock(&sc->mutex);
336 	struct i2c_softc *sc;
338 	sc = device_get_softc(dev);
342 	mtx_lock(&sc->mutex);
346 	mtx_unlock(&sc->mutex);
355 	struct i2c_softc *sc;
360 	sc = device_get_softc(dev);
367 	WRITE1(sc, I2CSTAT, reg);
370 	mtx_lock(&sc->mutex);
373 	clear_ipend(sc);
374 	error = wait_for_iif(sc);
377 		mtx_unlock(&sc->mutex);
380 	READ1(sc, I2CDS);
387 			reg = READ1(sc, I2CCON);
389 			WRITE1(sc, I2CCON, reg);
392 		clear_ipend(sc);
394 		error = wait_for_iif(sc);
397 			mtx_unlock(&sc->mutex);
401 		d = READ1(sc, I2CDS);
408 	mtx_unlock(&sc->mutex);
415 	struct i2c_softc *sc;
418 	sc = device_get_softc(dev);
424 	mtx_lock(&sc->mutex);
431 		WRITE1(sc, I2CDS, d);
434 		clear_ipend(sc);
436 		error = wait_for_iif(sc);
439 			mtx_unlock(&sc->mutex);
443 		if (!is_ack(sc)) {
445 			mtx_unlock(&sc->mutex);
453 	mtx_unlock(&sc->mutex);