1 /* SPDX-License-Identifier: GPL-2.0+ */
3  *  Driver for 8250/16550-type serial ports
79 #define UART_CAP_AFE	BIT(11)	/* MCR-based hw flow control */
84 #define UART_CAP_IRDA	BIT(16)	/* UART supports IrDA line discipline */
137 	return up->port.serial_in(&up->port, offset);  in serial_in()
142 	up->port.serial_out(&up->port, offset, value);  in serial_out()
146  *	serial_lsr_in - Read LSR register and preserve flags across reads
149  *	Read LSR register and handle saving non-preserved flags across reads.
151  *	up->lsr_saved_flags.
157 	u16 lsr = up->lsr_saved_flags;  in serial_lsr_in()
160 	up->lsr_saved_flags = lsr & up->lsr_save_mask;  in serial_lsr_in()
179 	serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD);  in serial_icr_read()
182 	serial_icr_write(up, UART_ACR, up->acr);  in serial_icr_read()
191 	return up->dl_read(up);  in serial_dl_read()
196 	up->dl_write(up, value);  in serial_dl_write()
202 	lockdep_assert_held_once(&up->port.lock);  in serial8250_set_THRI()
204 	if (up->ier & UART_IER_THRI)  in serial8250_set_THRI()
206 	up->ier |= UART_IER_THRI;  in serial8250_set_THRI()
207 	serial_out(up, UART_IER, up->ier);  in serial8250_set_THRI()
214 	lockdep_assert_held_once(&up->port.lock);  in serial8250_clear_THRI()
216 	if (!(up->ier & UART_IER_THRI))  in serial8250_clear_THRI()
218 	up->ier &= ~UART_IER_THRI;  in serial8250_clear_THRI()
219 	serial_out(up, UART_IER, up->ier);  in serial8250_clear_THRI()
239 /* MCR <-> TIOCM conversion */
276 /* MSR <-> TIOCM conversion */
297 	if (up->gpios)  in serial8250_out_MCR()
298 		mctrl_gpio_set(up->gpios, serial8250_MCR_to_TIOCM(value));  in serial8250_out_MCR()
307 	if (up->gpios) {  in serial8250_in_MCR()
310 		mctrl_gpio = mctrl_gpio_get_outputs(up->gpios, &mctrl_gpio);  in serial8250_in_MCR()
338 #include <linux/soc/ti/omap1-soc.h>
343 	switch (pt->port.mapbase) {  in is_omap1_8250()
385 	struct uart_8250_dma *dma = p->dma;  in serial8250_do_prepare_tx_dma()
387 	if (dma->prepare_tx_dma)  in serial8250_do_prepare_tx_dma()
388 		dma->prepare_tx_dma(p);  in serial8250_do_prepare_tx_dma()
393 	struct uart_8250_dma *dma = p->dma;  in serial8250_do_prepare_rx_dma()
395 	if (dma->prepare_rx_dma)  in serial8250_do_prepare_rx_dma()
396 		dma->prepare_rx_dma(p);  in serial8250_do_prepare_rx_dma()
401 	struct uart_8250_dma *dma = p->dma;  in serial8250_tx_dma_running()
403 	return dma && dma->tx_running;  in serial8250_tx_dma_running()
408 	return -1;  in serial8250_tx_dma()
413 	return -1;  in serial8250_rx_dma()
418 	return -1;  in serial8250_request_dma()
435 		/* already in high speed mode */  in ns16550a_goto_highspeed()
439 		status |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */  in ns16550a_goto_highspeed()
447 	return port->minor - 64;  in serial_index()