1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * linux/include/linux/serial_8250.h
5 * Copyright (C) 2004 Russell King
7 #ifndef _LINUX_SERIAL_8250_H
8 #define _LINUX_SERIAL_8250_H
10 #include <linux/atomic.h>
11 #include <linux/serial_core.h>
12 #include <linux/serial_reg.h>
13 #include <linux/platform_device.h>
16 * This is the platform device platform_data structure
18 struct plat_serial8250_port {
19 unsigned long iobase; /* io base address */
20 void __iomem *membase; /* ioremap cookie or NULL */
21 resource_size_t mapbase; /* resource base */
22 unsigned int irq; /* interrupt number */
23 unsigned long irqflags; /* request_irq flags */
24 unsigned int uartclk; /* UART clock rate */
26 unsigned char regshift; /* register shift */
27 unsigned char iotype; /* UPIO_* */
29 unsigned char has_sysrq; /* supports magic SysRq */
30 upf_t flags; /* UPF_* flags */
31 unsigned int type; /* If UPF_FIXED_TYPE */
32 unsigned int (*serial_in)(struct uart_port *, int);
33 void (*serial_out)(struct uart_port *, int, int);
34 void (*set_termios)(struct uart_port *,
36 struct ktermios *old);
37 void (*set_ldisc)(struct uart_port *,
39 unsigned int (*get_mctrl)(struct uart_port *);
40 int (*handle_irq)(struct uart_port *);
41 void (*pm)(struct uart_port *, unsigned int state,
43 void (*handle_break)(struct uart_port *);
47 * Allocate 8250 platform device IDs. Nothing is implied by
48 * the numbering here, except for the legacy entry being -1.
51 PLAT8250_DEV_LEGACY = -1,
52 PLAT8250_DEV_PLATFORM,
53 PLAT8250_DEV_PLATFORM1,
54 PLAT8250_DEV_PLATFORM2,
55 PLAT8250_DEV_FOURPORT,
58 PLAT8250_DEV_EXAR_ST16C554,
65 struct uart_8250_port;
68 * 8250 core driver operations
70 * @setup_irq() Setup irq handling. The universal 8250 driver links this
71 * port to the irq chain. Other drivers may @request_irq().
72 * @release_irq() Undo irq handling. The universal 8250 driver unlinks
73 * the port from the irq chain.
75 struct uart_8250_ops {
76 int (*setup_irq)(struct uart_8250_port *);
77 void (*release_irq)(struct uart_8250_port *);
78 void (*setup_timer)(struct uart_8250_port *);
81 struct uart_8250_em485 {
82 struct hrtimer start_tx_timer; /* "rs485 start tx" timer */
83 struct hrtimer stop_tx_timer; /* "rs485 stop tx" timer */
84 struct hrtimer *active_timer; /* pointer to active timer */
85 struct uart_8250_port *port; /* for hrtimer callbacks */
86 unsigned int tx_stopped:1; /* tx is currently stopped */
90 * This should be used by drivers which want to register
91 * their own 8250 ports without registering their own
92 * platform device. Using these will make your driver
93 * dependent on the 8250 driver.
96 struct uart_8250_port {
97 struct uart_port port;
98 struct timer_list timer; /* "no irq" timer */
99 struct list_head list; /* ports on this IRQ */
100 u32 capabilities; /* port capabilities */
101 unsigned short bugs; /* port bugs */
102 bool fifo_bug; /* min RX trigger if enabled */
103 unsigned int tx_loadsz; /* transmit fifo load size */
109 unsigned char mcr_mask; /* mask of user bits */
110 unsigned char mcr_force; /* mask of forced bits */
111 unsigned char cur_iotype; /* Running I/O type */
112 unsigned int rpm_tx_active;
113 unsigned char canary; /* non-zero during system sleep
114 * if no_console_suspend
117 struct mctrl_gpios *gpios;
118 #define UART_PROBE_RSA (1 << 0)
121 * Some bits in registers are cleared on a read, so they must
122 * be saved whenever the register is read but the bits will not
123 * be immediately processed.
125 #define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
126 unsigned char lsr_saved_flags;
127 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
128 unsigned char msr_saved_flags;
130 atomic_t console_printing;
132 struct uart_8250_dma *dma;
133 const struct uart_8250_ops *ops;
135 /* 8250 specific callbacks */
136 int (*dl_read)(struct uart_8250_port *);
137 void (*dl_write)(struct uart_8250_port *, int);
139 struct uart_8250_em485 *em485;
140 void (*rs485_start_tx)(struct uart_8250_port *);
141 void (*rs485_stop_tx)(struct uart_8250_port *);
143 /* Serial port overrun backoff */
144 struct delayed_work overrun_backoff;
145 u32 overrun_backoff_time_ms;
148 static inline struct uart_8250_port *up_to_u8250p(struct uart_port *up)
150 return container_of(up, struct uart_8250_port, port);
153 int serial8250_register_8250_port(const struct uart_8250_port *);
154 void serial8250_unregister_port(int line);
155 void serial8250_suspend_port(int line);
156 void serial8250_resume_port(int line);
158 extern int early_serial_setup(struct uart_port *port);
160 extern int early_serial8250_setup(struct earlycon_device *device,
161 const char *options);
162 extern void serial8250_update_uartclk(struct uart_port *port,
163 unsigned int uartclk);
164 extern void serial8250_do_set_termios(struct uart_port *port,
165 struct ktermios *termios, struct ktermios *old);
166 extern void serial8250_do_set_ldisc(struct uart_port *port,
167 struct ktermios *termios);
168 extern unsigned int serial8250_do_get_mctrl(struct uart_port *port);
169 extern int serial8250_do_startup(struct uart_port *port);
170 extern void serial8250_do_shutdown(struct uart_port *port);
171 extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
172 unsigned int oldstate);
173 extern void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl);
174 extern void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud,
176 unsigned int quot_frac);
177 extern int fsl8250_handle_irq(struct uart_port *port);
178 int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
179 unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr);
180 void serial8250_read_char(struct uart_8250_port *up, unsigned char lsr);
181 void serial8250_tx_chars(struct uart_8250_port *up);
182 unsigned int serial8250_modem_status(struct uart_8250_port *up);
183 void serial8250_init_port(struct uart_8250_port *up);
184 void serial8250_set_defaults(struct uart_8250_port *up);
185 void serial8250_console_write(struct uart_8250_port *up, const char *s,
187 void serial8250_console_write_atomic(struct uart_8250_port *up, const char *s,
189 int serial8250_console_setup(struct uart_port *port, char *options, bool probe);
190 int serial8250_console_exit(struct uart_port *port);
192 extern void serial8250_set_isa_configurator(void (*v)
193 (int port, struct uart_port *up,
196 #ifdef CONFIG_SERIAL_8250_RT288X
197 unsigned int au_serial_in(struct uart_port *p, int offset);
198 void au_serial_out(struct uart_port *p, int offset, int value);