2  * SPDX-License-Identifier: BSD-2-Clause
4  * Copyright (c) 2025 Poul-Henning Kamp <phk@FreeBSD.org>
27  * QualComm GENI I2C controller
29  * The GENI is actually a multi-protocol serial controller, so a lot of
125 #define RD(sc, reg) bus_read_4((sc)->regs_res, reg)
126 #define WR(sc, reg, val) bus_write_4((sc)->regs_res, reg, val)
131 	device_printf(sc->dev, "Register Dump\n");  in geni_dump_regs()
133 	device_printf(sc->dev, \  in geni_dump_regs()
142 static SYSCTL_NODE(_hw, OID_AUTO, geniiic, CTLFLAG_RW, 0, "GENI I2C");
156 	mtx_lock_spin(&sc->intr_lock);  in geniiic_intr()
160 	if (sc->rx_buf != NULL && rx_fifo_status & 0x3f) {  in geniiic_intr()
163 		unsigned gotlen = (((rx_fifo_status & 0x3f) << 2)-1) * 4;  in geniiic_intr()
173 			for (u = 0; u < 4 && sc->rx_len && gotlen; u++) {  in geniiic_intr()
174 				*sc->rx_buf++ = data & 0xff;  in geniiic_intr()
176 				sc->rx_len--;  in geniiic_intr()
177 				gotlen--;  in geniiic_intr()
187 		sc->rx_complete = true;  in geniiic_intr()
194 	sc->cmd_status = m_status;  in geniiic_intr()
196 	if (sc->rx_buf == NULL) {  in geniiic_intr()
197 		device_printf(sc->dev,  in geniiic_intr()
202 		device_printf(sc->dev,  in geniiic_intr()
205 		device_printf(sc->dev,  in geniiic_intr()
208 		device_printf(sc->dev,  in geniiic_intr()
211 		device_printf(sc->dev,  in geniiic_intr()
219 	mtx_unlock_spin(&sc->intr_lock);  in geniiic_intr()
248 	sc->rx_complete = false;  in geniiic_read()
249 	sc->rx_fifo = false;  in geniiic_read()
250 	sc->rx_buf = buf;  in geniiic_read()
251 	sc->rx_len = len;  in geniiic_read()
264 	WR(sc, GENI_RX_WATERMARK_REG, sc->rx_fifo_size - 4);  in geniiic_read()
274 	mtx_lock_spin(&sc->intr_lock);  in geniiic_read()
275 	sc->rx_fifo = false;  in geniiic_read()
278 		msleep_spin_sbt(sc, &sc->intr_lock,  in geniiic_read()
280 		if (sc->rx_complete)  in geniiic_read()
283 	if (msec > sc->worst) {  in geniiic_read()
284 		device_printf(sc->dev,  in geniiic_read()
285 		    "Tworst from %u to %u\n", sc->worst, msec);  in geniiic_read()
287 		    sc->worst = msec;  in geniiic_read()
290 	if (!sc->rx_complete) {  in geniiic_read()
295 		device_printf(sc->dev,  in geniiic_read()
296 		    "Incomplete read (residual %x)\n", sc->rx_len);  in geniiic_read()
299 	sc->rx_buf = NULL;  in geniiic_read()
300 	len = sc->rx_len;  in geniiic_read()
301 	sc->rx_len = 0;  in geniiic_read()
303 	mtx_unlock_spin(&sc->intr_lock);  in geniiic_read()
306 	device_printf(sc->dev, \  in geniiic_read()
308 	    slave, len, cmd, sc->cmd_status \  in geniiic_read()
312 		unsigned unit = device_get_unit(sc->dev);  in geniiic_read()
321 	if (sc->cmd_status & (1<<10)) {  in geniiic_read()
361 			if (len) { data |= *buf <<  0; buf++; len--; }  in geniiic_write()
362 			if (len) { data |= *buf <<  8; buf++; len--; }  in geniiic_write()
363 			if (len) { data |= *buf << 16; buf++; len--; }  in geniiic_write()
364 			if (len) { data |= *buf << 24; buf++; len--; }  in geniiic_write()
376 	device_printf(sc->dev,  in geniiic_write()
402 	if (sc->nfail > 4) {  in geniiic_transfer()
407 	sx_xlock(&sc->real_bus_lock);  in geniiic_transfer()
419 		    (u < nmsgs - 1) && (msgs[u].flags & IIC_M_NOSTOP);  in geniiic_transfer()
437 		sc->nfail++;  in geniiic_transfer()
439 		sc->nfail = 0;  in geniiic_transfer()
440 	sx_xunlock(&sc->real_bus_lock);  in geniiic_transfer()
489 		if (sx_try_xlock(&sc->bus_lock) == 0)  in geniiic_callback()
492 			sc->bus_locked = true;  in geniiic_callback()
496 		if (!sc->bus_locked) {  in geniiic_callback()
499 		sc->bus_locked = false;  in geniiic_callback()
500 		sx_xunlock(&sc->bus_lock);  in geniiic_callback()
518 	mtx_init(&sc->intr_lock, "geniiic intr lock", NULL, MTX_SPIN);  in geniiic_attach()
519 	sx_init(&sc->real_bus_lock, "geniiic real bus lock");  in geniiic_attach()
520 	sx_init(&sc->bus_lock, "geniiic bus lock");  in geniiic_attach()
522 	sc->rx_fifo_size = (RD(sc, GENI_HW_PARAM_1) >> 16) & 0x3f;  in geniiic_attach()
523 	device_printf(sc->dev, "  RX fifo size= 0x%x\n", sc->rx_fifo_size);  in geniiic_attach()
532 	sc->iicbus = device_add_child(sc->dev, "iicbus", DEVICE_UNIT_ANY);  in geniiic_attach()
533 	if (sc->iicbus == NULL) {  in geniiic_attach()
534 		device_printf(sc->dev, "iicbus driver not found\n");  in geniiic_attach()
538 	error = bus_setup_intr(sc->dev,  in geniiic_attach()
539 	    sc->intr_res, INTR_TYPE_MISC | INTR_MPSAFE,  in geniiic_attach()
540 	    geniiic_intr, NULL, sc, &sc->intr_handle);  in geniiic_attach()
542 		device_printf(sc->dev,  in geniiic_attach()
546 	bus_attach_children(sc->dev);  in geniiic_attach()
555 	error = bus_generic_detach(sc->dev);  in geniiic_detach()
561 	if (sc->intr_handle) {  in geniiic_detach()
562 		bus_teardown_intr(sc->dev, sc->intr_res, sc->intr_handle);  in geniiic_detach()
565 	sx_xlock(&sc->bus_lock);  in geniiic_detach()
566 	sx_xlock(&sc->real_bus_lock);  in geniiic_detach()
568 	geniiic_reset(sc->dev, 0, 0, NULL);  in geniiic_detach()
569 	sc->iicbus = NULL;  in geniiic_detach()
570 	sc->intr_handle = NULL;  in geniiic_detach()
572 	sx_xunlock(&sc->real_bus_lock);  in geniiic_detach()
573 	sx_xunlock(&sc->bus_lock);  in geniiic_detach()
575 	sx_destroy(&sc->real_bus_lock);  in geniiic_detach()
576 	sx_destroy(&sc->bus_lock);  in geniiic_detach()
578 	mtx_destroy(&sc->intr_lock);  in geniiic_detach()
587 	device_printf(sc->dev, "suspend method is NO-OP (good luck!)\n");  in geniiic_suspend()
589 	error = bus_generic_suspend(sc->dev);  in geniiic_suspend()
598 	device_printf(sc->dev, "resume method is NO-OP (good luck!)\n");  in geniiic_resume()
600 	error = bus_generic_resume(sc->dev);  in geniiic_resume()