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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/serial_reg.h>
16#include <linux/platform_device.h>
17
18/*
19 * This is the platform device platform_data structure
20 */
21struct 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 */
28 void *private_data;
29 unsigned char regshift; /* register shift */
30 unsigned char iotype; /* UPIO_* */
31 unsigned char hub6;
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 *,
37 struct ktermios *new,
38 struct ktermios *old);
39 void (*set_ldisc)(struct uart_port *,
40 struct ktermios *);
41 unsigned int (*get_mctrl)(struct uart_port *);
42 int (*handle_irq)(struct uart_port *);
43 void (*pm)(struct uart_port *, unsigned int state,
44 unsigned old);
45 void (*handle_break)(struct uart_port *);
46};
47
48/*
49 * Allocate 8250 platform device IDs. Nothing is implied by
50 * the numbering here, except for the legacy entry being -1.
51 */
52enum {
53 PLAT8250_DEV_LEGACY = -1,
54 PLAT8250_DEV_PLATFORM,
55 PLAT8250_DEV_PLATFORM1,
56 PLAT8250_DEV_PLATFORM2,
57 PLAT8250_DEV_FOURPORT,
58 PLAT8250_DEV_ACCENT,
59 PLAT8250_DEV_BOCA,
60 PLAT8250_DEV_EXAR_ST16C554,
61 PLAT8250_DEV_HUB6,
62 PLAT8250_DEV_AU1X00,
63 PLAT8250_DEV_SM501,
64};
65
66struct uart_8250_dma;
67struct uart_8250_port;
68
69/**
70 * 8250 core driver operations
71 *
72 * @setup_irq() Setup irq handling. The universal 8250 driver links this
73 * port to the irq chain. Other drivers may @request_irq().
74 * @release_irq() Undo irq handling. The universal 8250 driver unlinks
75 * the port from the irq chain.
76 */
77struct uart_8250_ops {
78 int (*setup_irq)(struct uart_8250_port *);
79 void (*release_irq)(struct uart_8250_port *);
80};
81
82struct uart_8250_em485 {
83 struct hrtimer start_tx_timer; /* "rs485 start tx" timer */
84 struct hrtimer stop_tx_timer; /* "rs485 stop tx" timer */
85 struct hrtimer *active_timer; /* pointer to active timer */
86 struct uart_8250_port *port; /* for hrtimer callbacks */
87};
88
89/*
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.
94 */
95
96struct 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 */
104 unsigned char acr;
105 unsigned char fcr;
106 unsigned char ier;
107 unsigned char lcr;
108 unsigned char mcr;
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
115 */
116 unsigned char probe;
117#define UART_PROBE_RSA (1 << 0)
118
119 /*
120 * Some bits in registers are cleared on a read, so they must
121 * be saved whenever the register is read but the bits will not
122 * be immediately processed.
123 */
124#define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
125 unsigned char lsr_saved_flags;
126#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
127 unsigned char msr_saved_flags;
128
129 struct uart_8250_dma *dma;
130 const struct uart_8250_ops *ops;
131
132 /* 8250 specific callbacks */
133 int (*dl_read)(struct uart_8250_port *);
134 void (*dl_write)(struct uart_8250_port *, int);
135
136 struct uart_8250_em485 *em485;
137
138 /* Serial port overrun backoff */
139 struct delayed_work overrun_backoff;
140 u32 overrun_backoff_time_ms;
141};
142
143static inline struct uart_8250_port *up_to_u8250p(struct uart_port *up)
144{
145 return container_of(up, struct uart_8250_port, port);
146}
147
148int serial8250_register_8250_port(struct uart_8250_port *);
149void serial8250_unregister_port(int line);
150void serial8250_suspend_port(int line);
151void serial8250_resume_port(int line);
152
153extern int early_serial_setup(struct uart_port *port);
154
155extern int early_serial8250_setup(struct earlycon_device *device,
156 const char *options);
157extern void serial8250_do_set_termios(struct uart_port *port,
158 struct ktermios *termios, struct ktermios *old);
159extern void serial8250_do_set_ldisc(struct uart_port *port,
160 struct ktermios *termios);
161extern unsigned int serial8250_do_get_mctrl(struct uart_port *port);
162extern int serial8250_do_startup(struct uart_port *port);
163extern void serial8250_do_shutdown(struct uart_port *port);
164extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
165 unsigned int oldstate);
166extern void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl);
167extern void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud,
168 unsigned int quot,
169 unsigned int quot_frac);
170extern int fsl8250_handle_irq(struct uart_port *port);
171int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
172unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr);
173void serial8250_read_char(struct uart_8250_port *up, unsigned char lsr);
174void serial8250_tx_chars(struct uart_8250_port *up);
175unsigned int serial8250_modem_status(struct uart_8250_port *up);
176void serial8250_init_port(struct uart_8250_port *up);
177void serial8250_set_defaults(struct uart_8250_port *up);
178void serial8250_console_write(struct uart_8250_port *up, const char *s,
179 unsigned int count);
180int serial8250_console_setup(struct uart_port *port, char *options, bool probe);
181
182extern void serial8250_set_isa_configurator(void (*v)
183 (int port, struct uart_port *up,
184 u32 *capabilities));
185
186#endif