3  * ARC On-Chip(fpga) UART Driver
17  *  -New Serial Core based ARC UART driver
37  * ARC UART Hardware Specs
42  * UART Register set (this is not a Standards Compliant IP)
54 /* Bits for UART Status Reg (R/W) */
67 /* Uart bit fiddling helpers: lowest level */
75 /* Uart bit fiddling helpers: API level */
76 #define UART_SET_DATA(uart, val)   UART_REG_SET(uart, R_DATA, val)  argument
77 #define UART_GET_DATA(uart)        UART_REG_GET(uart, R_DATA)  argument
79 #define UART_SET_BAUDH(uart, val)  UART_REG_SET(uart, R_BAUDH, val)  argument
80 #define UART_SET_BAUDL(uart, val)  UART_REG_SET(uart, R_BAUDL, val)  argument
82 #define UART_CLR_STATUS(uart, val) UART_REG_CLR(uart, R_STS, val)  argument
83 #define UART_GET_STATUS(uart)      UART_REG_GET(uart, R_STS)  argument
85 #define UART_ALL_IRQ_DISABLE(uart) UART_REG_CLR(uart, R_STS, RXIENB|TXIENB)  argument
86 #define UART_RX_IRQ_DISABLE(uart)  UART_REG_CLR(uart, R_STS, RXIENB)  argument
87 #define UART_TX_IRQ_DISABLE(uart)  UART_REG_CLR(uart, R_STS, TXIENB)  argument
89 #define UART_ALL_IRQ_ENABLE(uart)  UART_REG_OR(uart, R_STS, RXIENB|TXIENB)  argument
90 #define UART_RX_IRQ_ENABLE(uart)   UART_REG_OR(uart, R_STS, RXIENB)  argument
91 #define UART_TX_IRQ_ENABLE(uart)   UART_REG_OR(uart, R_STS, TXIENB)  argument
108 #define DRIVER_NAME	"arc-uart"
202 	 * UART has 4 deep RX-FIFO. Driver's recongnition of this fact  in arc_serial_rx_chars()
249  * to keep things simple as well as efficient, it writes to UART in polled
261  *   -writes-data-to-uart
282 	 * notifications from the UART Controller.  in arc_serial_isr()
330 	/* ARC UART doesn't support sending Break signal */  in arc_serial_break_ctl()
335 	/* Before we hook up the ISR, Disable all UART Interrupts */  in arc_serial_startup()
338 	if (request_irq(port->irq, arc_serial_isr, 0, "arc uart rx-tx", port)) {  in arc_serial_startup()
339 		dev_warn(port->dev, "Unable to attach ARC UART intr\n");  in arc_serial_startup()
358 	struct arc_uart_port *uart = to_arc_port(port);  in arc_serial_set_termios()  local
366 	 * Formula for ARC UART is: hw-val = ((CLK/(BAUD*4)) -1)  in arc_serial_set_termios()
371 	hw_val = port->uartclk / (uart->baud * 4) - 1;  in arc_serial_set_termios()
385 	 * UART doesn't support Parity/Hardware Flow Control;  in arc_serial_set_termios()
496 	 * The uart port backing the console (e.g. ttyARC1) might not have been  in arc_serial_console_setup()
572 OF_EARLYCON_DECLARE(arc_uart, "snps,arc-uart", arc_early_console_setup);
579 	struct arc_uart_port *uart;  in arc_serial_probe()  local
597 	uart = &arc_uart_ports[dev_id];  in arc_serial_probe()
598 	port = &uart->port;  in arc_serial_probe()
610 	uart->baud = val;  in arc_serial_probe()
614 		/* No point of dev_err since UART itself is hosed here */  in arc_serial_probe()
644 	{ .compatible = "snps,arc-uart" },