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2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b 
 kernel/include/linux/serial_core.h
....@@ -1,27 +1,15 @@
1
+/* SPDX-License-Identifier: GPL-2.0-or-later */
12 /*
23  *  linux/drivers/char/serial_core.h
34  *
45  *  Copyright (C) 2000 Deep Blue Solutions Ltd.
5
- *
6
- * This program is free software; you can redistribute it and/or modify
7
- * it under the terms of the GNU General Public License as published by
8
- * the Free Software Foundation; either version 2 of the License, or
9
- * (at your option) any later version.
10
- *
11
- * This program is distributed in the hope that it will be useful,
12
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14
- * GNU General Public License for more details.
15
- *
16
- * You should have received a copy of the GNU General Public License
17
- * along with this program; if not, write to the Free Software
18
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
196  */
207 #ifndef LINUX_SERIAL_CORE_H
218 #define LINUX_SERIAL_CORE_H
229 
2310 #include <linux/bitops.h>
2411 #include <linux/compiler.h>
12
+#include <linux/console.h>
2513 #include <linux/interrupt.h>
2614 #include <linux/circ_buf.h>
2715 #include <linux/spinlock.h>
....@@ -29,6 +17,7 @@
2917 #include <linux/tty.h>
3018 #include <linux/mutex.h>
3119 #include <linux/sysrq.h>
20
+#include <linux/android_kabi.h>
3221 #include <uapi/linux/serial_core.h>
3322 
3423 #ifdef CONFIG_SERIAL_CORE_CONSOLE
....@@ -41,10 +30,11 @@
4130 struct uart_port;
4231 struct serial_struct;
4332 struct device;
33
+struct gpio_desc;
4434 
4535 /*
4636  * This structure describes all the operations that can be done on the
47
- * physical hardware.  See Documentation/serial/driver for details.
37
+ * physical hardware.  See Documentation/driver-api/serial/driver.rst for details.
4838  */
4939 struct uart_ops {
5040 	unsigned int	(*tx_empty)(struct uart_port *);
....@@ -91,6 +81,9 @@
9181 	void		(*poll_put_char)(struct uart_port *, unsigned char);
9282 	int		(*poll_get_char)(struct uart_port *);
9383 #endif
84
+
85
+	ANDROID_KABI_RESERVE(1);
86
+	ANDROID_KABI_RESERVE(2);
9487 };
9588 
9689 #define NO_POLL_CHAR		0x00ff0000
....@@ -144,6 +137,8 @@
144137 	void			(*handle_break)(struct uart_port *);
145138 	int			(*rs485_config)(struct uart_port *,
146139 						struct serial_rs485 *rs485);
140
+	int			(*iso7816_config)(struct uart_port *,
141
+						  struct serial_iso7816 *iso7816);
147142 	unsigned int		irq;			/* irq number */
148143 	unsigned long		irqflags;		/* irq flags  */
149144 	unsigned int		uartclk;		/* base uart clock */
....@@ -171,11 +166,6 @@
171166 	struct uart_icount	icount;			/* statistics */
172167 
173168 	struct console		*cons;			/* struct console, if any */
174
-#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
175
-	unsigned long		sysrq;			/* sysrq timeout */
176
-	unsigned int		sysrq_ch;		/* char for sysrq */
177
-#endif
178
-
179169 	/* flags must be updated while holding port mutex */
180170 	upf_t			flags;
181171 
....@@ -254,14 +244,25 @@
254244 	resource_size_t		mapbase;		/* for ioremap */
255245 	resource_size_t		mapsize;
256246 	struct device		*dev;			/* parent device */
247
+
248
+	unsigned long		sysrq;			/* sysrq timeout */
249
+	unsigned int		sysrq_ch;		/* char for sysrq */
250
+	unsigned char		has_sysrq;
251
+	unsigned char		sysrq_seq;		/* index in sysrq_toggle_seq */
252
+
257253 	unsigned char		hub6;			/* this should be in the 8250 driver */
258254 	unsigned char		suspended;
259
-	unsigned char		unused[2];
255
+	unsigned char		console_reinit;
260256 	const char		*name;			/* port name */
261257 	struct attribute_group	*attr_group;		/* port specific attributes */
262258 	const struct attribute_group **tty_groups;	/* all attributes (serial core use only) */
263259 	struct serial_rs485     rs485;
260
+	struct gpio_desc	*rs485_term_gpio;	/* enable RS485 bus termination */
261
+	struct serial_iso7816   iso7816;
264262 	void			*private_data;		/* generic platform data pointer */
263
+
264
+	ANDROID_KABI_RESERVE(1);
265
+	ANDROID_KABI_RESERVE(2);
265266 };
266267 
267268 static inline int serial_port_in(struct uart_port *up, int offset)
....@@ -306,6 +307,23 @@
306307 /* number of characters left in xmit buffer before we ask for more */
307308 #define WAKEUP_CHARS		256
308309 
310
+/**
311
+ * uart_xmit_advance - Advance xmit buffer and account Tx'ed chars
312
+ * @up: uart_port structure describing the port
313
+ * @chars: number of characters sent
314
+ *
315
+ * This function advances the tail of circular xmit buffer by the number of
316
+ * @chars transmitted and handles accounting of transmitted bytes (into
317
+ * @up's icount.tx).
318
+ */
319
+static inline void uart_xmit_advance(struct uart_port *up, unsigned int chars)
320
+{
321
+	struct circ_buf *xmit = &up->state->xmit;
322
+
323
+	xmit->tail = (xmit->tail + chars) & (UART_XMIT_SIZE - 1);
324
+	up->icount.tx += chars;
325
+}
326
+
309327 struct module;
310328 struct tty_driver;
311329 
....@@ -324,6 +342,8 @@
324342 	 */
325343 	struct uart_state	*state;
326344 	struct tty_driver	*tty_driver;
345
+
346
+	ANDROID_KABI_RESERVE(1);
327347 };
328348 
329349 void uart_write_wakeup(struct uart_port *port);
....@@ -379,7 +399,7 @@
379399 		    .compatible = compat,				\
380400 		    .setup = fn  };					\
381401 	static const struct earlycon_id EARLYCON_USED_OR_UNUSED		\
382
-		__section(__earlycon_table)				\
402
+		__section("__earlycon_table")				\
383403 		* const __PASTE(__p, unique_id) = &unique_id
384404 
385405 #define OF_EARLYCON_DECLARE(_name, compat, fn)				\
....@@ -399,6 +419,11 @@
399419 static const bool earlycon_acpi_spcr_enable EARLYCON_USED_OR_UNUSED;
400420 static inline int setup_earlycon(char *buf) { return 0; }
401421 #endif
422
+
423
+static inline bool uart_console_enabled(struct uart_port *port)
424
+{
425
+	return uart_console(port) && (port->cons->flags & CON_ENABLED);
426
+}
402427 
403428 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
404429 				   struct console *c);
....@@ -469,37 +494,59 @@
469494 extern void uart_insert_char(struct uart_port *port, unsigned int status,
470495 		 unsigned int overrun, unsigned int ch, unsigned int flag);
471496 
472
-#if defined(SUPPORT_SYSRQ) && defined(CONFIG_MAGIC_SYSRQ_SERIAL)
473
-static inline int
474
-uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
497
+void uart_xchar_out(struct uart_port *uport, int offset);
498
+
499
+#ifdef CONFIG_MAGIC_SYSRQ_SERIAL
500
+#define SYSRQ_TIMEOUT	(HZ * 5)
501
+
502
+bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch);
503
+
504
+static inline int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
475505 {
476
-	if (port->sysrq) {
477
-		if (ch && time_before(jiffies, port->sysrq)) {
506
+	if (!port->sysrq)
507
+		return 0;
508
+
509
+	if (ch && time_before(jiffies, port->sysrq)) {
510
+		if (sysrq_mask()) {
478511 			handle_sysrq(ch);
479512 			port->sysrq = 0;
480513 			return 1;
481514 		}
482
-		port->sysrq = 0;
515
+		if (uart_try_toggle_sysrq(port, ch))
516
+			return 1;
483517 	}
518
+	port->sysrq = 0;
519
+
484520 	return 0;
485521 }
486
-static inline int
487
-uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch)
522
+
523
+static inline int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch)
488524 {
489
-	if (port->sysrq) {
490
-		if (ch && time_before(jiffies, port->sysrq)) {
525
+	if (!port->sysrq)
526
+		return 0;
527
+
528
+	if (ch && time_before(jiffies, port->sysrq)) {
529
+		if (sysrq_mask()) {
491530 			port->sysrq_ch = ch;
492531 			port->sysrq = 0;
493532 			return 1;
494533 		}
495
-		port->sysrq = 0;
534
+		if (uart_try_toggle_sysrq(port, ch))
535
+			return 1;
496536 	}
537
+	port->sysrq = 0;
538
+
497539 	return 0;
498540 }
499
-static inline void
500
-uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
541
+
542
+static inline void uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
501543 {
502544 	int sysrq_ch;
545
+
546
+	if (!port->has_sysrq) {
547
+		spin_unlock_irqrestore(&port->lock, irqflags);
548
+		return;
549
+	}
503550 
504551 	sysrq_ch = port->sysrq_ch;
505552 	port->sysrq_ch = 0;
....@@ -509,17 +556,20 @@
509556 	if (sysrq_ch)
510557 		handle_sysrq(sysrq_ch);
511558 }
512
-#else
513
-static inline int
514
-uart_handle_sysrq_char(struct uart_port *port, unsigned int ch) { return 0; }
515
-static inline int
516
-uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch) { return 0; }
517
-static inline void
518
-uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
559
+#else	/* CONFIG_MAGIC_SYSRQ_SERIAL */
560
+static inline int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
561
+{
562
+	return 0;
563
+}
564
+static inline int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch)
565
+{
566
+	return 0;
567
+}
568
+static inline void uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
519569 {
520570 	spin_unlock_irqrestore(&port->lock, irqflags);
521571 }
522
-#endif
572
+#endif	/* CONFIG_MAGIC_SYSRQ_SERIAL */
523573 
524574 /*
525575  * We do the SysRQ and SAK checking like this...
....@@ -531,10 +581,10 @@
531581 	if (port->handle_break)
532582 		port->handle_break(port);
533583 
534
-#ifdef SUPPORT_SYSRQ
535
-	if (port->cons && port->cons->index == port->line) {
584
+#ifdef CONFIG_MAGIC_SYSRQ_SERIAL
585
+	if (port->has_sysrq && uart_console(port)) {
536586 		if (!port->sysrq) {
537
-			port->sysrq = jiffies + HZ*5;
587
+			port->sysrq = jiffies + SYSRQ_TIMEOUT;
538588 			return 1;
539589 		}
540590 		port->sysrq = 0;
....@@ -552,5 +602,5 @@
552602 					 (cflag) & CRTSCTS || \
553603 					 !((cflag) & CLOCAL))
554604 
555
-void uart_get_rs485_mode(struct device *dev, struct serial_rs485 *rs485conf);
605
+int uart_get_rs485_mode(struct uart_port *port);
556606 #endif /* LINUX_SERIAL_CORE_H */