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/platform_device.h>
18 * This is the platform device platform_data structure
20 struct plat_serial8250_port
{
21 unsigned long iobase
; /* io base address */
22 void __iomem
*membase
; /* ioremap cookie or NULL */
23 resource_size_t mapbase
; /* resource base */
24 unsigned int irq
; /* interrupt number */
25 unsigned long irqflags
; /* request_irq flags */
26 unsigned int uartclk
; /* UART clock rate */
28 unsigned char regshift
; /* register shift */
29 unsigned char iotype
; /* UPIO_* */
31 upf_t flags
; /* UPF_* flags */
32 unsigned int type
; /* If UPF_FIXED_TYPE */
33 unsigned int (*serial_in
)(struct uart_port
*, int);
34 void (*serial_out
)(struct uart_port
*, int, int);
35 void (*set_termios
)(struct uart_port
*,
37 struct ktermios
*old
);
38 int (*handle_irq
)(struct uart_port
*);
39 void (*pm
)(struct uart_port
*, unsigned int state
,
41 void (*handle_break
)(struct uart_port
*);
45 * Allocate 8250 platform device IDs. Nothing is implied by
46 * the numbering here, except for the legacy entry being -1.
49 PLAT8250_DEV_LEGACY
= -1,
50 PLAT8250_DEV_PLATFORM
,
51 PLAT8250_DEV_PLATFORM1
,
52 PLAT8250_DEV_PLATFORM2
,
53 PLAT8250_DEV_FOURPORT
,
56 PLAT8250_DEV_EXAR_ST16C554
,
63 struct uart_8250_port
;
66 * 8250 core driver operations
68 * @setup_irq() Setup irq handling. The universal 8250 driver links this
69 * port to the irq chain. Other drivers may @request_irq().
70 * @release_irq() Undo irq handling. The universal 8250 driver unlinks
71 * the port from the irq chain.
73 struct uart_8250_ops
{
74 int (*setup_irq
)(struct uart_8250_port
*);
75 void (*release_irq
)(struct uart_8250_port
*);
79 * This should be used by drivers which want to register
80 * their own 8250 ports without registering their own
81 * platform device. Using these will make your driver
82 * dependent on the 8250 driver.
85 struct uart_8250_port
{
86 struct uart_port port
;
87 struct timer_list timer
; /* "no irq" timer */
88 struct list_head list
; /* ports on this IRQ */
89 unsigned short capabilities
; /* port capabilities */
90 unsigned short bugs
; /* port bugs */
91 bool fifo_bug
; /* min RX trigger if enabled */
92 unsigned int tx_loadsz
; /* transmit fifo load size */
98 unsigned char mcr_mask
; /* mask of user bits */
99 unsigned char mcr_force
; /* mask of forced bits */
100 unsigned char cur_iotype
; /* Running I/O type */
101 unsigned int rpm_tx_active
;
102 unsigned char canary
; /* non-zero during system sleep
103 * if no_console_suspend
106 #define UART_PROBE_RSA (1 << 0)
109 * Some bits in registers are cleared on a read, so they must
110 * be saved whenever the register is read but the bits will not
111 * be immediately processed.
113 #define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
114 unsigned char lsr_saved_flags
;
115 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
116 unsigned char msr_saved_flags
;
118 struct uart_8250_dma
*dma
;
119 const struct uart_8250_ops
*ops
;
121 /* 8250 specific callbacks */
122 int (*dl_read
)(struct uart_8250_port
*);
123 void (*dl_write
)(struct uart_8250_port
*, int);
126 static inline struct uart_8250_port
*up_to_u8250p(struct uart_port
*up
)
128 return container_of(up
, struct uart_8250_port
, port
);
131 int serial8250_register_8250_port(struct uart_8250_port
*);
132 void serial8250_unregister_port(int line
);
133 void serial8250_suspend_port(int line
);
134 void serial8250_resume_port(int line
);
136 extern int early_serial_setup(struct uart_port
*port
);
138 extern unsigned int serial8250_early_in(struct uart_port
*port
, int offset
);
139 extern void serial8250_early_out(struct uart_port
*port
, int offset
, int value
);
140 extern void serial8250_do_set_termios(struct uart_port
*port
,
141 struct ktermios
*termios
, struct ktermios
*old
);
142 extern int serial8250_do_startup(struct uart_port
*port
);
143 extern void serial8250_do_shutdown(struct uart_port
*port
);
144 extern void serial8250_do_pm(struct uart_port
*port
, unsigned int state
,
145 unsigned int oldstate
);
146 extern void serial8250_do_set_mctrl(struct uart_port
*port
, unsigned int mctrl
);
147 extern int fsl8250_handle_irq(struct uart_port
*port
);
148 int serial8250_handle_irq(struct uart_port
*port
, unsigned int iir
);
149 unsigned char serial8250_rx_chars(struct uart_8250_port
*up
, unsigned char lsr
);
150 void serial8250_tx_chars(struct uart_8250_port
*up
);
151 unsigned int serial8250_modem_status(struct uart_8250_port
*up
);
153 extern void serial8250_set_isa_configurator(void (*v
)
154 (int port
, struct uart_port
*up
,
155 unsigned short *capabilities
));