1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
4  * Copyright (C) 2008-2009 Semihalf, Michal Hajduk
50 #define I2C_ADDR_REG		0x00 /* I2C slave address register */
51 #define I2C_FDR_REG		0x04 /* I2C frequency divider register */
52 #define I2C_CONTROL_REG		0x08 /* I2C control register */
53 #define I2C_STATUS_REG		0x0C /* I2C status register */
54 #define I2C_DATA_REG		0x10 /* I2C data register */
55 #define I2C_DFSRR_REG		0x14 /* I2C Digital Filter Sampling rate */
56 #define I2C_ENABLE		0x80 /* Module enable - interrupt disable */
59 #define I2CSR_MASS		(1<<6) /* Addressed as a slave */
62 #define I2CSR_SRW		(1<<2) /* Slave read/write */
65 #define I2CCR_MSTA		(1<<5) /* Master/slave mode */
93 static int i2c_repeated_start(device_t dev, u_char slave, int timeout);
94 static int i2c_start(device_t dev, u_char slave, int timeout);
96 static int i2c_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr);
123 DRIVER_MODULE(i2c, simplebus, i2c_driver, 0, 0);
124 DRIVER_MODULE(iicbus, i2c, iicbus_driver, 0, 0);
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()
160 			    "after sending slave address" : "");  in i2c_do_wait()
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()
205 	/* Enable I2C */  in i2c_probe()
207 	bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);  in i2c_probe()
208 	device_set_desc(dev, "I2C bus controller");  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()
246 i2c_repeated_start(device_t dev, u_char slave, int timeout)  in i2c_repeated_start()  argument
253 	mtx_lock(&sc->mutex);  in i2c_repeated_start()
256 	/* Write target address - LSB is R/W bit */  in i2c_repeated_start()
257 	i2c_write_reg(sc, I2C_DATA_REG, slave);  in i2c_repeated_start()
261 	mtx_unlock(&sc->mutex);  in i2c_repeated_start()
270 i2c_start(device_t dev, u_char slave, int timeout)  in i2c_start()  argument
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()
292 	i2c_write_reg(sc, I2C_DATA_REG, slave);  in i2c_start()
297 	mtx_unlock(&sc->mutex);  in i2c_start()
310 	mtx_lock(&sc->mutex);  in i2c_stop()
313 	mtx_unlock(&sc->mutex);  in i2c_stop()
319 i2c_reset(device_t dev, u_char speed, u_char addr, u_char *oldadr)  in i2c_reset()  argument
338 	mtx_lock(&sc->mutex);  in i2c_reset()
346 	mtx_unlock(&sc->mutex);  in i2c_reset()
360 	mtx_lock(&sc->mutex);  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()
396 	mtx_unlock(&sc->mutex);  in i2c_read()
410 	mtx_lock(&sc->mutex);  in i2c_write()
417 			mtx_unlock(&sc->mutex);  in i2c_write()
423 	mtx_unlock(&sc->mutex);  in i2c_write()