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 */
116 static inline int serial_in(struct uart_8250_port *up, int offset)  in serial_in()  argument
118 	return up->port.serial_in(&up->port, offset);  in serial_in()
121 static inline void serial_out(struct uart_8250_port *up, int offset, int value)  in serial_out()  argument
123 	up->port.serial_out(&up->port, offset, value);  in serial_out()
127  *	serial_lsr_in - Read LSR register and preserve flags across reads
128  *	@up:	uart 8250 port
130  *	Read LSR register and handle saving non-preserved flags across reads.
132  *	up->lsr_saved_flags.
136 static inline u16 serial_lsr_in(struct uart_8250_port *up)  in serial_lsr_in()  argument
138 	u16 lsr = up->lsr_saved_flags;  in serial_lsr_in()
140 	lsr |= serial_in(up, UART_LSR);  in serial_lsr_in()
141 	up->lsr_saved_flags = lsr & up->lsr_save_mask;  in serial_lsr_in()
149 static void serial_icr_write(struct uart_8250_port *up, int offset, int value)  in serial_icr_write()  argument
151 	serial_out(up, UART_SCR, offset);  in serial_icr_write()
152 	serial_out(up, UART_ICR, value);  in serial_icr_write()
155 static unsigned int __maybe_unused serial_icr_read(struct uart_8250_port *up,  in serial_icr_read()  argument
160 	serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD);  in serial_icr_read()
161 	serial_out(up, UART_SCR, offset);  in serial_icr_read()
162 	value = serial_in(up, UART_ICR);  in serial_icr_read()
163 	serial_icr_write(up, UART_ACR, up->acr);  in serial_icr_read()
170 static inline int serial_dl_read(struct uart_8250_port *up)  in serial_dl_read()  argument
172 	return up->dl_read(up);  in serial_dl_read()
175 static inline void serial_dl_write(struct uart_8250_port *up, int value)  in serial_dl_write()  argument
177 	up->dl_write(up, value);  in serial_dl_write()
180 static inline bool serial8250_set_THRI(struct uart_8250_port *up)  in serial8250_set_THRI()  argument
182 	if (up->ier & UART_IER_THRI)  in serial8250_set_THRI()
184 	up->ier |= UART_IER_THRI;  in serial8250_set_THRI()
185 	serial_out(up, UART_IER, up->ier);  in serial8250_set_THRI()
189 static inline bool serial8250_clear_THRI(struct uart_8250_port *up)  in serial8250_clear_THRI()  argument
191 	if (!(up->ier & UART_IER_THRI))  in serial8250_clear_THRI()
193 	up->ier &= ~UART_IER_THRI;  in serial8250_clear_THRI()
194 	serial_out(up, UART_IER, up->ier);  in serial8250_clear_THRI()
213 /* MCR <-> TIOCM conversion */
250 /* MSR <-> TIOCM conversion */
267 static inline void serial8250_out_MCR(struct uart_8250_port *up, int value)  in serial8250_out_MCR()  argument
269 	serial_out(up, UART_MCR, value);  in serial8250_out_MCR()
271 	if (up->gpios)  in serial8250_out_MCR()
272 		mctrl_gpio_set(up->gpios, serial8250_MCR_to_TIOCM(value));  in serial8250_out_MCR()
275 static inline int serial8250_in_MCR(struct uart_8250_port *up)  in serial8250_in_MCR()  argument
279 	mctrl = serial_in(up, UART_MCR);  in serial8250_in_MCR()
281 	if (up->gpios) {  in serial8250_in_MCR()
284 		mctrl_gpio = mctrl_gpio_get_outputs(up->gpios, &mctrl_gpio);  in serial8250_in_MCR()
309 #include <linux/soc/ti/omap1-soc.h>
314 	switch (pt->port.mapbase) {  in is_omap1_8250()
355 	struct uart_8250_dma *dma = p->dma;  in serial8250_do_prepare_tx_dma()
357 	if (dma->prepare_tx_dma)  in serial8250_do_prepare_tx_dma()
358 		dma->prepare_tx_dma(p);  in serial8250_do_prepare_tx_dma()
363 	struct uart_8250_dma *dma = p->dma;  in serial8250_do_prepare_rx_dma()
365 	if (dma->prepare_rx_dma)  in serial8250_do_prepare_rx_dma()
366 		dma->prepare_rx_dma(p);  in serial8250_do_prepare_rx_dma()
371 	return -1;  in serial8250_tx_dma()
375 	return -1;  in serial8250_rx_dma()
380 	return -1;  in serial8250_request_dma()
385 static inline int ns16550a_goto_highspeed(struct uart_8250_port *up)  in ns16550a_goto_highspeed()  argument
389 	status = serial_in(up, 0x04); /* EXCR2 */  in ns16550a_goto_highspeed()
396 		status |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */  in ns16550a_goto_highspeed()
397 		serial_out(up, 0x04, status);  in ns16550a_goto_highspeed()
404 	return port->minor - 64;  in serial_index()