1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
4  * Copyright (C) 2008-2009 Semihalf, Michal Hajduk
56 #define I2C_ENABLE		0x80 /* Module enable - interrupt disable */
62 #define I2CSR_SRW		(1<<2) /* Slave read/write */
97 static int i2c_read(device_t dev, char *buf, int len, int *read, int last, int delay);
130 	bus_space_write_1(sc->bst, sc->bsh, off, val);  in i2c_write_reg()
137 	return (bus_space_read_1(sc->bst, sc->bsh, off));  in i2c_read_reg()
189 	if (!ofw_bus_is_compatible(dev, "fsl-i2c"))  in i2c_probe()
193 	sc->rid = 0;  in i2c_probe()
195 	sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,  in i2c_probe()
197 	if (sc->res == NULL) {  in i2c_probe()
202 	sc->bst = rman_get_bustag(sc->res);  in i2c_probe()
203 	sc->bsh = rman_get_bushandle(sc->res);  in i2c_probe()
207 	bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);  in i2c_probe()
219 	sc->dev = dev;  in i2c_attach()
220 	sc->rid = 0;  in i2c_attach()
222 	mtx_init(&sc->mutex, device_get_nameunit(dev), "I2C", MTX_DEF);  in i2c_attach()
224 	sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,  in i2c_attach()
226 	if (sc->res == NULL) {  in i2c_attach()
228 		mtx_destroy(&sc->mutex);  in i2c_attach()
232 	sc->bst = rman_get_bustag(sc->res);  in i2c_attach()
233 	sc->bsh = rman_get_bushandle(sc->res);  in i2c_attach()
235 	sc->iicbus = device_add_child(dev, "iicbus", DEVICE_UNIT_ANY);  in i2c_attach()
236 	if (sc->iicbus == NULL) {  in i2c_attach()
238 		mtx_destroy(&sc->mutex);  in i2c_attach()
253 	mtx_lock(&sc->mutex);  in i2c_repeated_start()
256 	/* Write target address - LSB is R/W bit */  in i2c_repeated_start()
258 	DELAY(1250);  in i2c_repeated_start()
261 	mtx_unlock(&sc->mutex);  in i2c_repeated_start()
277 	DELAY(1000);  in i2c_start()
279 	mtx_lock(&sc->mutex);  in i2c_start()
284 		mtx_unlock(&sc->mutex);  in i2c_start()
291 	/* Write target address - LSB is R/W bit */  in i2c_start()
293 	DELAY(1250);  in i2c_start()
297 	mtx_unlock(&sc->mutex);  in i2c_start()
310 	mtx_lock(&sc->mutex);  in i2c_stop()
312 	DELAY(1000);  in i2c_stop()
313 	mtx_unlock(&sc->mutex);  in i2c_stop()
338 	mtx_lock(&sc->mutex);  in i2c_reset()
341 	DELAY(1000);  in i2c_reset()
345 	DELAY(1000);  in i2c_reset()
346 	mtx_unlock(&sc->mutex);  in i2c_reset()
352 i2c_read(device_t dev, char *buf, int len, int *read, int last, int delay)  in i2c_read()  argument
358 	*read = 0;  in i2c_read()
360 	mtx_lock(&sc->mutex);  in i2c_read()
370 		/* dummy read */  in i2c_read()
372 		DELAY(1000);  in i2c_read()
375 	while (*read < len) {  in i2c_read()
376 		DELAY(1000);  in i2c_read()
379 			mtx_unlock(&sc->mutex);  in i2c_read()
382 		if ((*read == len - 2) && last) {  in i2c_read()
387 		if ((*read == len - 1) && last) {  in i2c_read()
393 		(*read)++;  in i2c_read()
394 		DELAY(1250);  in i2c_read()
396 	mtx_unlock(&sc->mutex);  in i2c_read()
410 	mtx_lock(&sc->mutex);  in i2c_write()
413 		DELAY(1250);  in i2c_write()
417 			mtx_unlock(&sc->mutex);  in i2c_write()
423 	mtx_unlock(&sc->mutex);  in i2c_write()