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serial_8250.h
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1 /*
2  * linux/include/linux/serial_8250.h
3  *
4  * Copyright (C) 2004 Russell King
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 #ifndef _LINUX_SERIAL_8250_H
12 #define _LINUX_SERIAL_8250_H
13 
14 #include <linux/serial_core.h>
15 #include <linux/platform_device.h>
16 
17 /*
18  * This is the platform device platform_data structure
19  */
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 */
27  void *private_data;
28  unsigned char regshift; /* register shift */
29  unsigned char iotype; /* UPIO_* */
30  unsigned char hub6;
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 *,
36  struct ktermios *new,
37  struct ktermios *old);
38  int (*handle_irq)(struct uart_port *);
39  void (*pm)(struct uart_port *, unsigned int state,
40  unsigned old);
41  void (*handle_break)(struct uart_port *);
42 };
43 
44 /*
45  * Allocate 8250 platform device IDs. Nothing is implied by
46  * the numbering here, except for the legacy entry being -1.
47  */
48 enum {
49  PLAT8250_DEV_LEGACY = -1,
50  PLAT8250_DEV_PLATFORM,
51  PLAT8250_DEV_PLATFORM1,
52  PLAT8250_DEV_PLATFORM2,
53  PLAT8250_DEV_FOURPORT,
54  PLAT8250_DEV_ACCENT,
55  PLAT8250_DEV_BOCA,
56  PLAT8250_DEV_EXAR_ST16C554,
57  PLAT8250_DEV_HUB6,
58  PLAT8250_DEV_AU1X00,
59  PLAT8250_DEV_SM501,
60 };
61 
62 /*
63  * This should be used by drivers which want to register
64  * their own 8250 ports without registering their own
65  * platform device. Using these will make your driver
66  * dependent on the 8250 driver.
67  */
68 
69 struct uart_8250_port {
70  struct uart_port port;
71  struct timer_list timer; /* "no irq" timer */
72  struct list_head list; /* ports on this IRQ */
73  unsigned short capabilities; /* port capabilities */
74  unsigned short bugs; /* port bugs */
75  unsigned int tx_loadsz; /* transmit fifo load size */
76  unsigned char acr;
77  unsigned char ier;
78  unsigned char lcr;
79  unsigned char mcr;
80  unsigned char mcr_mask; /* mask of user bits */
81  unsigned char mcr_force; /* mask of forced bits */
82  unsigned char cur_iotype; /* Running I/O type */
83 
84  /*
85  * Some bits in registers are cleared on a read, so they must
86  * be saved whenever the register is read but the bits will not
87  * be immediately processed.
88  */
89 #define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
90  unsigned char lsr_saved_flags;
91 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
92  unsigned char msr_saved_flags;
93 
94  /* 8250 specific callbacks */
95  int (*dl_read)(struct uart_8250_port *);
96  void (*dl_write)(struct uart_8250_port *, int);
97 };
98 
99 int serial8250_register_8250_port(struct uart_8250_port *);
100 void serial8250_unregister_port(int line);
101 void serial8250_suspend_port(int line);
102 void serial8250_resume_port(int line);
103 
104 extern int early_serial_setup(struct uart_port *port);
105 
106 extern int serial8250_find_port(struct uart_port *p);
107 extern int serial8250_find_port_for_earlycon(void);
108 extern int setup_early_serial8250_console(char *cmdline);
109 extern void serial8250_do_set_termios(struct uart_port *port,
110  struct ktermios *termios, struct ktermios *old);
111 extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
112  unsigned int oldstate);
113 extern int fsl8250_handle_irq(struct uart_port *port);
114 int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
115 unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr);
116 void serial8250_tx_chars(struct uart_8250_port *up);
117 unsigned int serial8250_modem_status(struct uart_8250_port *up);
118 
119 extern void serial8250_set_isa_configurator(void (*v)
120  (int port, struct uart_port *up,
121  unsigned short *capabilities));
122 
123 #endif
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