st-asc.c (14e77332e74603efab8347c89d3cda447c3b97c9) st-asc.c (d11cc8c3c4b65e00e01f20a920c5fa412415204a)
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * st-asc.c: ST Asynchronous serial controller (ASC) driver
4 *
5 * Copyright (C) 2003-2013 STMicroelectronics (R&D) Limited
6 */
7
8#include <linux/module.h>

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232
233/*
234 * Start transmitting chars.
235 * This is called from both interrupt and task level.
236 * Either way interrupts are disabled.
237 */
238static void asc_transmit_chars(struct uart_port *port)
239{
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * st-asc.c: ST Asynchronous serial controller (ASC) driver
4 *
5 * Copyright (C) 2003-2013 STMicroelectronics (R&D) Limited
6 */
7
8#include <linux/module.h>

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232
233/*
234 * Start transmitting chars.
235 * This is called from both interrupt and task level.
236 * Either way interrupts are disabled.
237 */
238static void asc_transmit_chars(struct uart_port *port)
239{
240 struct circ_buf *xmit = &port->state->xmit;
241 int txroom;
242 unsigned char c;
240 u8 ch;
243
241
244 txroom = asc_hw_txroom(port);
245
246 if ((txroom != 0) && port->x_char) {
247 c = port->x_char;
248 port->x_char = 0;
249 asc_out(port, ASC_TXBUF, c);
250 port->icount.tx++;
251 txroom = asc_hw_txroom(port);
252 }
253
254 if (uart_tx_stopped(port)) {
255 /*
256 * We should try and stop the hardware here, but I
257 * don't think the ASC has any way to do that.
258 */
259 asc_disable_tx_interrupts(port);
260 return;
261 }
262
263 if (uart_circ_empty(xmit)) {
264 asc_disable_tx_interrupts(port);
265 return;
266 }
267
268 if (txroom == 0)
269 return;
270
271 do {
272 c = xmit->buf[xmit->tail];
273 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
274 asc_out(port, ASC_TXBUF, c);
275 port->icount.tx++;
276 txroom--;
277 } while ((txroom > 0) && (!uart_circ_empty(xmit)));
278
279 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
280 uart_write_wakeup(port);
281
282 if (uart_circ_empty(xmit))
283 asc_disable_tx_interrupts(port);
242 uart_port_tx_limited(port, ch, asc_hw_txroom(port),
243 true,
244 asc_out(port, ASC_TXBUF, ch),
245 ({}));
284}
285
286static void asc_receive_chars(struct uart_port *port)
287{
288 struct tty_port *tport = &port->state->port;
289 unsigned long status, mode;
290 unsigned long c = 0;
291 char flag;

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247
248static void asc_receive_chars(struct uart_port *port)
249{
250 struct tty_port *tport = &port->state->port;
251 unsigned long status, mode;
252 unsigned long c = 0;
253 char flag;

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