1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
31 /* A driver for the Cadence AMBA UART as used by the Xilinx Zynq-7000.
33  * Reference: Zynq-7000 All Programmable SoC Technical Reference Manual.
55 	bus_space_read_4((bas)->bst, (bas)->bsh, uart_regofs((bas), (reg)))
57 	bus_space_write_4((bas)->bst, (bas)->bsh, uart_regofs((bas), (reg)), \
74 #define CDNC_UART_MODE_REG_CHMOD_R_LOOP	(3<<8)	/* [9:8] - channel mode */
77 #define CDNC_UART_MODE_REG_STOP2	(2<<6)	/* [7:6] - stop bits */
78 #define CDNC_UART_MODE_REG_PAR_NONE	(4<<3)	/* [5:3] - parity type */
83 #define CDNC_UART_MODE_REG_6BIT		(3<<1)	/* [2:1] - character len */
88 #define CDNC_UART_IEN_REG	0x08		/* Interrupt registers. */
95 #define CDNC_UART_INT_DMSI		(1<<9)	/* delta modem status */
144  * Low-level UART interface.
191 		baudgen = (bas->rclk + (baudrate * (bauddiv + 1)) / 2) /  in cdnc_uart_set_baud()
196 		baud_out = bas->rclk / (baudgen * (bauddiv + 1));  in cdnc_uart_set_baud()
198 			baud_out - baudrate : baudrate - baud_out;  in cdnc_uart_set_baud()
212 		return (-1); /* out of range */  in cdnc_uart_set_baud()
326  * interrupt driven).
382  * High-level UART interface.
419 	sc->sc_txfifosz = UART_FIFO_SIZE;  in cdnc_uart_bus_probe()
420 	sc->sc_rxfifosz = UART_FIFO_SIZE;  in cdnc_uart_bus_probe()
421 	sc->sc_hwiflow = 0;  in cdnc_uart_bus_probe()
422 	sc->sc_hwoflow = 0;  in cdnc_uart_bus_probe()
424 	device_set_desc(sc->sc_dev, "Cadence UART");  in cdnc_uart_bus_probe()
432 	struct uart_bas *bas = &sc->sc_bas;  in cdnc_uart_bus_attach()
435 	if (sc->sc_sysdev != NULL) {  in cdnc_uart_bus_attach()
436 		di = sc->sc_sysdev;  in cdnc_uart_bus_attach()
437 		(void)cdnc_uart_set_params(bas, di->baudrate, di->databits,  in cdnc_uart_bus_attach()
438 					   di->stopbits, di->parity);  in cdnc_uart_bus_attach()
444 	/* Enable interrupts. */  in cdnc_uart_bus_attach()
457 	struct uart_bas *bas = &sc->sc_bas;  in cdnc_uart_bus_transmit()
459 	uart_lock(sc->sc_hwmtx);  in cdnc_uart_bus_transmit()
464 	for (i = 0; i < sc->sc_txdatasz; i++)  in cdnc_uart_bus_transmit()
465 		WR4(bas, CDNC_UART_FIFO, sc->sc_txbuf[i]);  in cdnc_uart_bus_transmit()
467 	/* Enable TX empty interrupt. */  in cdnc_uart_bus_transmit()
469 	sc->sc_txbusy = 1;  in cdnc_uart_bus_transmit()
471 	uart_unlock(sc->sc_hwmtx);  in cdnc_uart_bus_transmit()
479 	struct uart_bas *bas = &sc->sc_bas;  in cdnc_uart_bus_setsig()
483 		old = sc->sc_hwsig;  in cdnc_uart_bus_setsig()
491 	} while (!atomic_cmpset_32(&sc->sc_hwsig, old, new));  in cdnc_uart_bus_setsig()
492 	uart_lock(sc->sc_hwmtx);  in cdnc_uart_bus_setsig()
501 	uart_unlock(sc->sc_hwmtx);  in cdnc_uart_bus_setsig()
508 	struct uart_bas *bas = &sc->sc_bas;  in cdnc_uart_bus_receive()
512 	uart_lock(sc->sc_hwmtx);  in cdnc_uart_bus_receive()
531 		    sc->sc_sysdev != NULL &&  in cdnc_uart_bus_receive()
532 		    sc->sc_sysdev->type == UART_DEV_CONSOLE) {  in cdnc_uart_bus_receive()
540 	uart_unlock(sc->sc_hwmtx);  in cdnc_uart_bus_receive()
550 	return (cdnc_uart_set_params(&sc->sc_bas, baudrate,  in cdnc_uart_bus_param()
558 	struct uart_bas *bas = &sc->sc_bas;  in cdnc_uart_bus_ipend()
561 	uart_lock(sc->sc_hwmtx);  in cdnc_uart_bus_ipend()
565 	/* Clear interrupt bits. */  in cdnc_uart_bus_ipend()
576 	if (sc->sc_txbusy && (istatus & CDNC_UART_INT_TXEMPTY) != 0) {  in cdnc_uart_bus_ipend()
577 		/* disable txempty interrupt. */  in cdnc_uart_bus_ipend()
590 	/* Modem signal change. */  in cdnc_uart_bus_ipend()
600 	uart_unlock(sc->sc_hwmtx);  in cdnc_uart_bus_ipend()
614 	struct uart_bas *bas = &sc->sc_bas;  in cdnc_uart_bus_getsig()
619 		old = sc->sc_hwsig;  in cdnc_uart_bus_getsig()
621 		uart_lock(sc->sc_hwmtx);  in cdnc_uart_bus_getsig()
623 		uart_unlock(sc->sc_hwmtx);  in cdnc_uart_bus_getsig()
633 	} while (!atomic_cmpset_32(&sc->sc_hwsig, old, new));  in cdnc_uart_bus_getsig()
640 	struct uart_bas *bas = &sc->sc_bas;  in cdnc_uart_bus_ioctl()
644 	uart_lock(sc->sc_hwmtx);  in cdnc_uart_bus_ioctl()
671 	uart_unlock(sc->sc_hwmtx);  in cdnc_uart_bus_ioctl()
680 	/* Enable interrupts. */  in cdnc_uart_bus_grab()
681 	WR4(&sc->sc_bas, CDNC_UART_IEN_REG,  in cdnc_uart_bus_grab()
690 	/* Enable interrupts. */  in cdnc_uart_bus_ungrab()
691 	WR4(&sc->sc_bas, CDNC_UART_IEN_REG,  in cdnc_uart_bus_ungrab()
707 	{"cdns,uart-r1p12",	(uintptr_t)&uart_cdnc_class},