2 * linux/include/linux/serial_8250.h
4 * Copyright (C) 2004 Russell King
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.
11 #ifndef _LINUX_SERIAL_8250_H
12 #define _LINUX_SERIAL_8250_H
14 #include <linux/serial_core.h>
15 #include <linux/serial_reg.h>
16 #include <linux/platform_device.h>
19 * This is the platform device platform_data structure
21 struct plat_serial8250_port
{
22 unsigned long iobase
; /* io base address */
23 void __iomem
*membase
; /* ioremap cookie or NULL */
24 resource_size_t mapbase
; /* resource base */
25 unsigned int irq
; /* interrupt number */
26 unsigned long irqflags
; /* request_irq flags */
27 unsigned int uartclk
; /* UART clock rate */
29 unsigned char regshift
; /* register shift */
30 unsigned char iotype
; /* UPIO_* */
32 upf_t flags
; /* UPF_* flags */
33 unsigned int type
; /* If UPF_FIXED_TYPE */
34 unsigned int (*serial_in
)(struct uart_port
*, int);
35 void (*serial_out
)(struct uart_port
*, int, int);
36 void (*set_termios
)(struct uart_port
*,
38 struct ktermios
*old
);
39 int (*handle_irq
)(struct uart_port
*);
40 void (*pm
)(struct uart_port
*, unsigned int state
,
42 void (*handle_break
)(struct uart_port
*);
46 * Allocate 8250 platform device IDs. Nothing is implied by
47 * the numbering here, except for the legacy entry being -1.
50 PLAT8250_DEV_LEGACY
= -1,
51 PLAT8250_DEV_PLATFORM
,
52 PLAT8250_DEV_PLATFORM1
,
53 PLAT8250_DEV_PLATFORM2
,
54 PLAT8250_DEV_FOURPORT
,
57 PLAT8250_DEV_EXAR_ST16C554
,
64 struct uart_8250_port
;
67 * 8250 core driver operations
69 * @setup_irq() Setup irq handling. The universal 8250 driver links this
70 * port to the irq chain. Other drivers may @request_irq().
71 * @release_irq() Undo irq handling. The universal 8250 driver unlinks
72 * the port from the irq chain.
74 struct uart_8250_ops
{
75 int (*setup_irq
)(struct uart_8250_port
*);
76 void (*release_irq
)(struct uart_8250_port
*);
80 * This should be used by drivers which want to register
81 * their own 8250 ports without registering their own
82 * platform device. Using these will make your driver
83 * dependent on the 8250 driver.
86 struct uart_8250_port
{
87 struct uart_port port
;
88 struct timer_list timer
; /* "no irq" timer */
89 struct list_head list
; /* ports on this IRQ */
90 unsigned short capabilities
; /* port capabilities */
91 unsigned short bugs
; /* port bugs */
92 bool fifo_bug
; /* min RX trigger if enabled */
93 unsigned int tx_loadsz
; /* transmit fifo load size */
99 unsigned char mcr_mask
; /* mask of user bits */
100 unsigned char mcr_force
; /* mask of forced bits */
101 unsigned char cur_iotype
; /* Running I/O type */
102 unsigned int rpm_tx_active
;
103 unsigned char canary
; /* non-zero during system sleep
104 * if no_console_suspend
107 #define UART_PROBE_RSA (1 << 0)
110 * Some bits in registers are cleared on a read, so they must
111 * be saved whenever the register is read but the bits will not
112 * be immediately processed.
114 #define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
115 unsigned char lsr_saved_flags
;
116 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
117 unsigned char msr_saved_flags
;
119 struct uart_8250_dma
*dma
;
120 const struct uart_8250_ops
*ops
;
122 /* 8250 specific callbacks */
123 int (*dl_read
)(struct uart_8250_port
*);
124 void (*dl_write
)(struct uart_8250_port
*, int);
127 static inline struct uart_8250_port
*up_to_u8250p(struct uart_port
*up
)
129 return container_of(up
, struct uart_8250_port
, port
);
132 int serial8250_register_8250_port(struct uart_8250_port
*);
133 void serial8250_unregister_port(int line
);
134 void serial8250_suspend_port(int line
);
135 void serial8250_resume_port(int line
);
137 extern int early_serial_setup(struct uart_port
*port
);
139 extern int early_serial8250_setup(struct earlycon_device
*device
,
140 const char *options
);
141 extern void serial8250_do_set_termios(struct uart_port
*port
,
142 struct ktermios
*termios
, struct ktermios
*old
);
143 extern int serial8250_do_startup(struct uart_port
*port
);
144 extern void serial8250_do_shutdown(struct uart_port
*port
);
145 extern void serial8250_do_pm(struct uart_port
*port
, unsigned int state
,
146 unsigned int oldstate
);
147 extern void serial8250_do_set_mctrl(struct uart_port
*port
, unsigned int mctrl
);
148 extern int fsl8250_handle_irq(struct uart_port
*port
);
149 int serial8250_handle_irq(struct uart_port
*port
, unsigned int iir
);
150 unsigned char serial8250_rx_chars(struct uart_8250_port
*up
, unsigned char lsr
);
151 void serial8250_tx_chars(struct uart_8250_port
*up
);
152 unsigned int serial8250_modem_status(struct uart_8250_port
*up
);
153 void serial8250_init_port(struct uart_8250_port
*up
);
154 void serial8250_set_defaults(struct uart_8250_port
*up
);
155 void serial8250_console_write(struct uart_8250_port
*up
, const char *s
,
157 int serial8250_console_setup(struct uart_port
*port
, char *options
, bool probe
);
159 extern void serial8250_set_isa_configurator(void (*v
)
160 (int port
, struct uart_port
*up
,
161 unsigned short *capabilities
));