1 /*-
27  * Allwinner RSB (Reduced Serial Bus) and P2WI (Push-Pull Two Wire Interface)
103 	{ "allwinner,sun6i-a31-p2wi",		A31_P2WI },
104 	{ "allwinner,sun8i-a23-rsb",		A23_RSB },
110 	{ -1, 0 }
114  * Device address to Run-time address mappings.
116  * Run-time address (RTA) is an 8-bit value used to address the device during
120  * Allwinner uses RTA 0x2d for the primary PMIC, 0x3a for the secondary PMIC,
147 #define	RSB_LOCK(sc)			mtx_lock(&(sc)->mtx)
148 #define	RSB_UNLOCK(sc)			mtx_unlock(&(sc)->mtx)
149 #define	RSB_ASSERT_LOCKED(sc)		mtx_assert(&(sc)->mtx, MA_OWNED)
150 #define	RSB_READ(sc, reg)		bus_read_4((sc)->res, (reg))
151 #define	RSB_WRITE(sc, reg, val)	bus_write_4((sc)->res, (reg), (val))
169 	/* Write soft-reset bit and wait for it to self-clear. */  in rsb_reset()
171 	for (retry = RSB_RESET_RETRY; retry > 0; retry--)  in rsb_reset()
193 		val |= ((uint32_t)buf[n] << ((n - off) * NBBY));  in rsb_encode()
204 		buf[n] = (val >> ((n - off) * NBBY)) & 0xff;  in rsb_decode()
222 	for (retry = RSB_I2C_TIMEOUT; retry > 0; retry--) {  in rsb_start()
223 		sc->status |= RSB_READ(sc, RSB_INTS);  in rsb_start()
224 		if ((sc->status & INT_TRANS_OVER) != 0) {  in rsb_start()
230 	if (error == 0 && (sc->status & INT_TRANS_OVER) == 0) {  in rsb_start()
232 		    sc->status);  in rsb_start()
251 	/* Lookup run-time address for given device address */  in rsb_set_rta()
262 	/* Set run-time address */  in rsb_set_rta()
297 	if (sc->type == A23_RSB) {  in rsb_transfer()
330 	while (sc->busy)  in rsb_transfer()
331 		mtx_sleep(sc, &sc->mtx, 0, "i2cbuswait", 0);  in rsb_transfer()
332 	sc->busy = 1;  in rsb_transfer()
333 	sc->status = 0;  in rsb_transfer()
335 	/* Select current run-time address if necessary */  in rsb_transfer()
336 	if (sc->type == A23_RSB) {  in rsb_transfer()
338 		if (sc->cur_addr != device_addr) {  in rsb_transfer()
342 			sc->cur_addr = device_addr;  in rsb_transfer()
343 			sc->status = 0;  in rsb_transfer()
361 	if (sc->type == A23_RSB)  in rsb_transfer()
365 	dlen = msgs[0].len - 1;  in rsb_transfer()
382 	sc->msg = NULL;  in rsb_transfer()
383 	sc->busy = 0;  in rsb_transfer()
396 	switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {  in rsb_probe()
417 	mtx_init(&sc->mtx, device_get_nameunit(dev), "rsb", MTX_DEF);  in rsb_attach()
419 	sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;  in rsb_attach()
421 	if (clk_get_by_ofw_index(dev, 0, 0, &sc->clk) == 0) {  in rsb_attach()
422 		error = clk_enable(sc->clk);  in rsb_attach()
428 	if (hwreset_get_by_ofw_idx(dev, 0, 0, &sc->rst) == 0) {  in rsb_attach()
429 		error = hwreset_deassert(sc->rst);  in rsb_attach()
431 			device_printf(dev, "cannot de-assert reset\n");  in rsb_attach()
436 	if (bus_alloc_resources(dev, rsb_spec, &sc->res) != 0) {  in rsb_attach()
442 	/* Set the PMIC into RSB mode as ATF might have leave it in I2C mode */  in rsb_attach()
445 	sc->iicbus = device_add_child(dev, "iicbus", DEVICE_UNIT_ANY);  in rsb_attach()
446 	if (sc->iicbus == NULL) {  in rsb_attach()
457 	bus_release_resources(dev, rsb_spec, &sc->res);  in rsb_attach()
458 	if (sc->rst != NULL)  in rsb_attach()
459 		hwreset_release(sc->rst);  in rsb_attach()
460 	if (sc->clk != NULL)  in rsb_attach()
461 		clk_release(sc->clk);  in rsb_attach()
462 	mtx_destroy(&sc->mtx);  in rsb_attach()