124 static inline void vt8500_write(struct uart_port *port, unsigned int val,  in vt8500_write()  argument
127 	writel(val, port->membase + off);  in vt8500_write()
130 static inline unsigned int vt8500_read(struct uart_port *port, unsigned int off)  in vt8500_read()  argument
132 	return readl(port->membase + off);  in vt8500_read()
135 static void vt8500_stop_tx(struct uart_port *port)  in vt8500_stop_tx()  argument
137 	struct vt8500_port *vt8500_port = container_of(port,  in vt8500_stop_tx()
142 	vt8500_write(port, vt8500_port->ier, VT8500_URIER);  in vt8500_stop_tx()
145 static void vt8500_stop_rx(struct uart_port *port)  in vt8500_stop_rx()  argument
147 	struct vt8500_port *vt8500_port = container_of(port,  in vt8500_stop_rx()
152 	vt8500_write(port, vt8500_port->ier, VT8500_URIER);  in vt8500_stop_rx()
155 static void vt8500_enable_ms(struct uart_port *port)  in vt8500_enable_ms()  argument
157 	struct vt8500_port *vt8500_port = container_of(port,  in vt8500_enable_ms()
162 	vt8500_write(port, vt8500_port->ier, VT8500_URIER);  in vt8500_enable_ms()
165 static void handle_rx(struct uart_port *port)  in handle_rx()  argument
167 	struct tty_port *tport = &port->state->port;  in handle_rx()
172 	if ((vt8500_read(port, VT8500_URISR) & RXOVER)) {  in handle_rx()
173 		port->icount.overrun++;  in handle_rx()
178 	while (vt8500_read(port, VT8500_URFIDX) & 0x1f00) {  in handle_rx()
182 		c = readw(port->membase + VT8500_RXFIFO) & 0x3ff;  in handle_rx()
185 		c &= ~port->read_status_mask;  in handle_rx()
188 			port->icount.frame++;  in handle_rx()
191 			port->icount.parity++;  in handle_rx()
194 		port->icount.rx++;  in handle_rx()
196 		if (!uart_handle_sysrq_char(port, c))  in handle_rx()
200 	spin_unlock(&port->lock);  in handle_rx()
202 	spin_lock(&port->lock);  in handle_rx()
205 static void handle_tx(struct uart_port *port)  in handle_tx()  argument
207 	struct circ_buf *xmit = &port->state->xmit;  in handle_tx()
209 	if (port->x_char) {  in handle_tx()
210 		writeb(port->x_char, port->membase + VT8500_TXFIFO);  in handle_tx()
211 		port->icount.tx++;  in handle_tx()
212 		port->x_char = 0;  in handle_tx()
214 	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {  in handle_tx()
215 		vt8500_stop_tx(port);  in handle_tx()
219 	while ((vt8500_read(port, VT8500_URFIDX) & 0x1f) < 16) {  in handle_tx()
223 		writeb(xmit->buf[xmit->tail], port->membase + VT8500_TXFIFO);  in handle_tx()
226 		port->icount.tx++;  in handle_tx()
230 		uart_write_wakeup(port);  in handle_tx()
233 		vt8500_stop_tx(port);  in handle_tx()
236 static void vt8500_start_tx(struct uart_port *port)  in vt8500_start_tx()  argument
238 	struct vt8500_port *vt8500_port = container_of(port,  in vt8500_start_tx()
243 	vt8500_write(port, vt8500_port->ier, VT8500_URIER);  in vt8500_start_tx()
244 	handle_tx(port);  in vt8500_start_tx()
246 	vt8500_write(port, vt8500_port->ier, VT8500_URIER);  in vt8500_start_tx()
249 static void handle_delta_cts(struct uart_port *port)  in handle_delta_cts()  argument
251 	port->icount.cts++;  in handle_delta_cts()
252 	wake_up_interruptible(&port->state->port.delta_msr_wait);  in handle_delta_cts()
257 	struct uart_port *port = dev_id;  in vt8500_irq()  local
260 	spin_lock(&port->lock);  in vt8500_irq()
261 	isr = vt8500_read(port, VT8500_URISR);  in vt8500_irq()
264 	vt8500_write(port, isr, VT8500_URISR);  in vt8500_irq()
267 		handle_rx(port);  in vt8500_irq()
269 		handle_tx(port);  in vt8500_irq()
271 		handle_delta_cts(port);  in vt8500_irq()
273 	spin_unlock(&port->lock);  in vt8500_irq()
278 static unsigned int vt8500_tx_empty(struct uart_port *port)  in vt8500_tx_empty()  argument
280 	return (vt8500_read(port, VT8500_URFIDX) & 0x1f) < 16 ?  in vt8500_tx_empty()
284 static unsigned int vt8500_get_mctrl(struct uart_port *port)  in vt8500_get_mctrl()  argument
288 	usr = vt8500_read(port, VT8500_URUSR);  in vt8500_get_mctrl()
295 static void vt8500_set_mctrl(struct uart_port *port, unsigned int mctrl)  in vt8500_set_mctrl()  argument
297 	unsigned int lcr = vt8500_read(port, VT8500_URLCR);  in vt8500_set_mctrl()
304 	vt8500_write(port, lcr, VT8500_URLCR);  in vt8500_set_mctrl()
307 static void vt8500_break_ctl(struct uart_port *port, int break_ctl)  in vt8500_break_ctl()  argument
310 		vt8500_write(port,  in vt8500_break_ctl()
311 			     vt8500_read(port, VT8500_URLCR) | VT8500_BREAK,  in vt8500_break_ctl()
315 static int vt8500_set_baud_rate(struct uart_port *port, unsigned int baud)  in vt8500_set_baud_rate()  argument
318 			container_of(port, struct vt8500_port, uart);  in vt8500_set_baud_rate()
323 	div |= (uart_get_divisor(port, baud) - 1) & 0x3ff;  in vt8500_set_baud_rate()
326 	baud = port->uartclk / 16 / ((div & 0x3ff) + 1);  in vt8500_set_baud_rate()
328 	while ((vt8500_read(port, VT8500_URUSR) & (1 << 5)) && --loops)  in vt8500_set_baud_rate()
331 	vt8500_write(port, div, VT8500_URDIV);  in vt8500_set_baud_rate()
334 	vt8500_write(port, mult_frac(baud, 4096, 1000000), VT8500_URBKR);  in vt8500_set_baud_rate()
339 static int vt8500_startup(struct uart_port *port)  in vt8500_startup()  argument
342 			container_of(port, struct vt8500_port, uart);  in vt8500_startup()
346 		 "vt8500_serial%d", port->line);  in vt8500_startup()
348 	ret = request_irq(port->irq, vt8500_irq, IRQF_TRIGGER_HIGH,  in vt8500_startup()
349 			  vt8500_port->name, port);  in vt8500_startup()
353 	vt8500_write(port, 0x03, VT8500_URLCR);	/* enable TX & RX */  in vt8500_startup()
358 static void vt8500_shutdown(struct uart_port *port)  in vt8500_shutdown()  argument
361 			container_of(port, struct vt8500_port, uart);  in vt8500_shutdown()
368 	free_irq(port->irq, port);  in vt8500_shutdown()
371 static void vt8500_set_termios(struct uart_port *port,  in vt8500_set_termios()  argument
376 			container_of(port, struct vt8500_port, uart);  in vt8500_set_termios()
381 	spin_lock_irqsave(&port->lock, flags);  in vt8500_set_termios()
384 	baud = uart_get_baud_rate(port, termios, old, 900, 921600);  in vt8500_set_termios()
385 	baud = vt8500_set_baud_rate(port, baud);  in vt8500_set_termios()
425 	port->read_status_mask = 0;  in vt8500_set_termios()
427 		port->read_status_mask = FER | PER;  in vt8500_set_termios()
429 	uart_update_timeout(port, termios->c_cflag, baud);  in vt8500_set_termios()
449 	spin_unlock_irqrestore(&port->lock, flags);  in vt8500_set_termios()
452 static const char *vt8500_type(struct uart_port *port)  in vt8500_type()  argument
455 			container_of(port, struct vt8500_port, uart);  in vt8500_type()
459 static void vt8500_release_port(struct uart_port *port)  in vt8500_release_port()  argument
463 static int vt8500_request_port(struct uart_port *port)  in vt8500_request_port()  argument
468 static void vt8500_config_port(struct uart_port *port, int flags)  in vt8500_config_port()  argument
470 	port->type = PORT_VT8500;  in vt8500_config_port()
473 static int vt8500_verify_port(struct uart_port *port,  in vt8500_verify_port()  argument
478 	if (unlikely(port->irq != ser->irq))  in vt8500_verify_port()
488 static inline void wait_for_xmitr(struct uart_port *port)  in wait_for_xmitr()  argument
494 		status = vt8500_read(port, VT8500_URFIDX);  in wait_for_xmitr()
502 static void vt8500_console_putchar(struct uart_port *port, int c)  in vt8500_console_putchar()  argument
504 	wait_for_xmitr(port);  in vt8500_console_putchar()
505 	writeb(c, port->membase + VT8500_TXFIFO);  in vt8500_console_putchar()
570 static int vt8500_get_poll_char(struct uart_port *port)  in vt8500_get_poll_char()  argument
572 	unsigned int status = vt8500_read(port, VT8500_URFIDX);  in vt8500_get_poll_char()
577 	return vt8500_read(port, VT8500_RXFIFO) & 0xff;  in vt8500_get_poll_char()
580 static void vt8500_put_poll_char(struct uart_port *port, unsigned char c)  in vt8500_put_poll_char()  argument
585 		status = vt8500_read(port, VT8500_URFIDX);  in vt8500_put_poll_char()
592 	vt8500_write(port, c, VT8500_TXFIFO);  in vt8500_put_poll_char()
644 	int port;  in vt8500_serial_probe()  local
658 		port = of_alias_get_id(np, "serial");  in vt8500_serial_probe()
659 		if (port >= VT8500_MAX_PORTS)  in vt8500_serial_probe()
660 			port = -1;  in vt8500_serial_probe()
662 		port = -1;  in vt8500_serial_probe()
665 	if (port < 0) {  in vt8500_serial_probe()
667 		port = find_first_zero_bit(&vt8500_ports_in_use,  in vt8500_serial_probe()
671 	if (port >= VT8500_MAX_PORTS)  in vt8500_serial_probe()
675 	if (test_and_set_bit(port, &vt8500_ports_in_use)) {  in vt8500_serial_probe()
712 	vt8500_port->uart.line = port;  in vt8500_serial_probe()
724 	vt8500_uart_ports[port] = vt8500_port;  in vt8500_serial_probe()