Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/char/serial_core.h |
| 3 | * |
| 4 | * Copyright (C) 2000 Deep Blue Solutions Ltd. |
| 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 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | #ifndef LINUX_SERIAL_CORE_H |
| 21 | #define LINUX_SERIAL_CORE_H |
| 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
Russell King | 661f83a | 2005-07-16 09:30:53 +0100 | [diff] [blame] | 24 | #include <linux/compiler.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/interrupt.h> |
| 26 | #include <linux/circ_buf.h> |
| 27 | #include <linux/spinlock.h> |
| 28 | #include <linux/sched.h> |
| 29 | #include <linux/tty.h> |
Ingo Molnar | e2862f6 | 2006-01-13 21:37:07 +0000 | [diff] [blame] | 30 | #include <linux/mutex.h> |
Maciej W. Rozycki | b11115c | 2007-06-01 00:47:07 -0700 | [diff] [blame] | 31 | #include <linux/sysrq.h> |
Alexander Gordeev | 6f4229b | 2011-01-12 17:00:50 -0800 | [diff] [blame] | 32 | #include <linux/pps_kernel.h> |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 33 | #include <uapi/linux/serial_core.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | struct uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | struct serial_struct; |
| 37 | struct device; |
| 38 | |
| 39 | /* |
| 40 | * This structure describes all the operations that can be |
| 41 | * done on the physical hardware. |
| 42 | */ |
| 43 | struct uart_ops { |
| 44 | unsigned int (*tx_empty)(struct uart_port *); |
| 45 | void (*set_mctrl)(struct uart_port *, unsigned int mctrl); |
| 46 | unsigned int (*get_mctrl)(struct uart_port *); |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 47 | void (*stop_tx)(struct uart_port *); |
| 48 | void (*start_tx)(struct uart_port *); |
Russell King | 9aba8d5b | 2012-04-17 17:23:14 +0100 | [diff] [blame] | 49 | void (*throttle)(struct uart_port *); |
| 50 | void (*unthrottle)(struct uart_port *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | void (*send_xchar)(struct uart_port *, char ch); |
| 52 | void (*stop_rx)(struct uart_port *); |
| 53 | void (*enable_ms)(struct uart_port *); |
| 54 | void (*break_ctl)(struct uart_port *, int ctl); |
| 55 | int (*startup)(struct uart_port *); |
| 56 | void (*shutdown)(struct uart_port *); |
Haavard Skinnemoen | 6bb0e3a | 2008-07-16 21:52:36 +0100 | [diff] [blame] | 57 | void (*flush_buffer)(struct uart_port *); |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 58 | void (*set_termios)(struct uart_port *, struct ktermios *new, |
| 59 | struct ktermios *old); |
Alan Cox | d87d9b7 | 2010-06-01 22:52:53 +0200 | [diff] [blame] | 60 | void (*set_ldisc)(struct uart_port *, int new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | void (*pm)(struct uart_port *, unsigned int state, |
| 62 | unsigned int oldstate); |
| 63 | int (*set_wake)(struct uart_port *, unsigned int state); |
| 64 | |
| 65 | /* |
| 66 | * Return a string describing the type of the port |
| 67 | */ |
| 68 | const char *(*type)(struct uart_port *); |
| 69 | |
| 70 | /* |
| 71 | * Release IO and memory resources used by the port. |
| 72 | * This includes iounmap if necessary. |
| 73 | */ |
| 74 | void (*release_port)(struct uart_port *); |
| 75 | |
| 76 | /* |
| 77 | * Request IO and memory resources used by the port. |
| 78 | * This includes iomapping the port if necessary. |
| 79 | */ |
| 80 | int (*request_port)(struct uart_port *); |
| 81 | void (*config_port)(struct uart_port *, int); |
| 82 | int (*verify_port)(struct uart_port *, struct serial_struct *); |
| 83 | int (*ioctl)(struct uart_port *, unsigned int, unsigned long); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 84 | #ifdef CONFIG_CONSOLE_POLL |
Anton Vorontsov | c7f3e70 | 2012-09-24 14:27:53 -0700 | [diff] [blame] | 85 | int (*poll_init)(struct uart_port *); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 86 | void (*poll_put_char)(struct uart_port *, unsigned char); |
| 87 | int (*poll_get_char)(struct uart_port *); |
| 88 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | }; |
| 90 | |
Jason Wessel | f5316b4 | 2010-05-20 21:04:22 -0500 | [diff] [blame] | 91 | #define NO_POLL_CHAR 0x00ff0000 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | #define UART_CONFIG_TYPE (1 << 0) |
| 93 | #define UART_CONFIG_IRQ (1 << 1) |
| 94 | |
| 95 | struct uart_icount { |
| 96 | __u32 cts; |
| 97 | __u32 dsr; |
| 98 | __u32 rng; |
| 99 | __u32 dcd; |
| 100 | __u32 rx; |
| 101 | __u32 tx; |
| 102 | __u32 frame; |
| 103 | __u32 overrun; |
| 104 | __u32 parity; |
| 105 | __u32 brk; |
| 106 | __u32 buf_overrun; |
| 107 | }; |
| 108 | |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 109 | typedef unsigned int __bitwise__ upf_t; |
| 110 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | struct uart_port { |
| 112 | spinlock_t lock; /* port lock */ |
David Miller | 0c8946d | 2008-10-13 10:35:23 +0100 | [diff] [blame] | 113 | unsigned long iobase; /* in/out[bwl] */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | unsigned char __iomem *membase; /* read/write[bwl] */ |
David Daney | 7d6a07d | 2009-01-02 13:49:47 +0000 | [diff] [blame] | 115 | unsigned int (*serial_in)(struct uart_port *, int); |
| 116 | void (*serial_out)(struct uart_port *, int, int); |
Philippe Langlais | 235dae5 | 2010-07-29 17:13:57 +0200 | [diff] [blame] | 117 | void (*set_termios)(struct uart_port *, |
| 118 | struct ktermios *new, |
| 119 | struct ktermios *old); |
Jamie Iles | a74036f | 2011-08-15 10:17:51 +0100 | [diff] [blame] | 120 | int (*handle_irq)(struct uart_port *); |
Manuel Lauss | c161afe | 2010-09-25 15:13:45 +0200 | [diff] [blame] | 121 | void (*pm)(struct uart_port *, unsigned int state, |
| 122 | unsigned int old); |
Dan Williams | bf03f65 | 2012-04-10 14:10:53 -0700 | [diff] [blame] | 123 | void (*handle_break)(struct uart_port *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | unsigned int irq; /* irq number */ |
Vikram Pandita | 1c2f049 | 2009-09-19 13:13:19 -0700 | [diff] [blame] | 125 | unsigned long irqflags; /* irq flags */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | unsigned int uartclk; /* base uart clock */ |
Russell King | 947deee | 2006-07-02 20:45:51 +0100 | [diff] [blame] | 127 | unsigned int fifosize; /* tx fifo size */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | unsigned char x_char; /* xon/xoff char */ |
| 129 | unsigned char regshift; /* reg offset shift */ |
| 130 | unsigned char iotype; /* io access style */ |
Russell King | 947deee | 2006-07-02 20:45:51 +0100 | [diff] [blame] | 131 | unsigned char unused1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
| 133 | #define UPIO_PORT (0) |
| 134 | #define UPIO_HUB6 (1) |
| 135 | #define UPIO_MEM (2) |
| 136 | #define UPIO_MEM32 (3) |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 137 | #define UPIO_AU (4) /* Au1x00 type IO */ |
Zang Roy-r61911 | 3be91ec | 2006-06-30 02:29:58 -0700 | [diff] [blame] | 138 | #define UPIO_TSI (5) /* Tsi108/109 type IO */ |
Jamie Iles | 4834d02 | 2011-08-15 10:17:55 +0100 | [diff] [blame] | 139 | #define UPIO_RM9000 (6) /* RM9000 type IO */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
| 141 | unsigned int read_status_mask; /* driver specific */ |
| 142 | unsigned int ignore_status_mask; /* driver specific */ |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 143 | struct uart_state *state; /* pointer to parent state */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | struct uart_icount icount; /* statistics */ |
| 145 | |
| 146 | struct console *cons; /* struct console, if any */ |
Alexander Beregalov | 06e82df | 2009-04-06 17:34:34 +0100 | [diff] [blame] | 147 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | unsigned long sysrq; /* sysrq timeout */ |
| 149 | #endif |
| 150 | |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 151 | upf_t flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 153 | #define UPF_FOURPORT ((__force upf_t) (1 << 1)) |
| 154 | #define UPF_SAK ((__force upf_t) (1 << 2)) |
| 155 | #define UPF_SPD_MASK ((__force upf_t) (0x1030)) |
| 156 | #define UPF_SPD_HI ((__force upf_t) (0x0010)) |
| 157 | #define UPF_SPD_VHI ((__force upf_t) (0x0020)) |
| 158 | #define UPF_SPD_CUST ((__force upf_t) (0x0030)) |
| 159 | #define UPF_SPD_SHI ((__force upf_t) (0x1000)) |
| 160 | #define UPF_SPD_WARP ((__force upf_t) (0x1010)) |
| 161 | #define UPF_SKIP_TEST ((__force upf_t) (1 << 6)) |
| 162 | #define UPF_AUTO_IRQ ((__force upf_t) (1 << 7)) |
| 163 | #define UPF_HARDPPS_CD ((__force upf_t) (1 << 11)) |
| 164 | #define UPF_LOW_LATENCY ((__force upf_t) (1 << 13)) |
| 165 | #define UPF_BUGGY_UART ((__force upf_t) (1 << 14)) |
Mauro Carvalho Chehab | b6adea3 | 2009-02-20 15:38:52 -0800 | [diff] [blame] | 166 | #define UPF_NO_TXEN_TEST ((__force upf_t) (1 << 15)) |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 167 | #define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16)) |
Russell King | dba0583 | 2012-04-17 16:41:10 +0100 | [diff] [blame] | 168 | /* Port has hardware-assisted h/w flow control (iow, auto-RTS *not* auto-CTS) */ |
| 169 | #define UPF_HARD_FLOW ((__force upf_t) (1 << 21)) |
Russell King | 2cbacaf | 2012-04-17 16:34:13 +0100 | [diff] [blame] | 170 | /* Port has hardware-assisted s/w flow control */ |
| 171 | #define UPF_SOFT_FLOW ((__force upf_t) (1 << 22)) |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 172 | #define UPF_CONS_FLOW ((__force upf_t) (1 << 23)) |
| 173 | #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24)) |
Søren Holm | 0631534 | 2011-09-02 22:55:37 +0200 | [diff] [blame] | 174 | #define UPF_EXAR_EFR ((__force upf_t) (1 << 25)) |
Dan Williams | bc02d15 | 2012-04-06 11:49:50 -0700 | [diff] [blame] | 175 | #define UPF_BUG_THRE ((__force upf_t) (1 << 26)) |
David Daney | 8e23fcc | 2009-01-02 13:49:54 +0000 | [diff] [blame] | 176 | /* The exact UART type is known and should not be probed. */ |
| 177 | #define UPF_FIXED_TYPE ((__force upf_t) (1 << 27)) |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 178 | #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28)) |
David Gibson | abb4a23 | 2007-05-06 14:48:49 -0700 | [diff] [blame] | 179 | #define UPF_FIXED_PORT ((__force upf_t) (1 << 29)) |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 180 | #define UPF_DEAD ((__force upf_t) (1 << 30)) |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 181 | #define UPF_IOREMAP ((__force upf_t) (1 << 31)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 183 | #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff)) |
| 184 | #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
| 186 | unsigned int mctrl; /* current modem ctrl settings */ |
| 187 | unsigned int timeout; /* character-based timeout */ |
| 188 | unsigned int type; /* port type */ |
Russell King | ba899db | 2006-01-21 22:45:50 +0000 | [diff] [blame] | 189 | const struct uart_ops *ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | unsigned int custom_divisor; |
| 191 | unsigned int line; /* port index */ |
Josh Boyer | 4f640ef | 2007-07-23 18:43:44 -0700 | [diff] [blame] | 192 | resource_size_t mapbase; /* for ioremap */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | struct device *dev; /* parent device */ |
| 194 | unsigned char hub6; /* this should be in the 8250 driver */ |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 195 | unsigned char suspended; |
Govindraj.R | 3f960db | 2010-12-16 18:12:47 +0530 | [diff] [blame] | 196 | unsigned char irq_wake; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 197 | unsigned char unused[2]; |
Marc St-Jean | beab697 | 2007-05-06 14:48:45 -0700 | [diff] [blame] | 198 | void *private_data; /* generic platform data pointer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | }; |
| 200 | |
Paul Gortmaker | 927353a | 2012-03-08 19:12:12 -0500 | [diff] [blame] | 201 | static inline int serial_port_in(struct uart_port *up, int offset) |
| 202 | { |
| 203 | return up->serial_in(up, offset); |
| 204 | } |
| 205 | |
| 206 | static inline void serial_port_out(struct uart_port *up, int offset, int value) |
| 207 | { |
| 208 | up->serial_out(up, offset, value); |
| 209 | } |
| 210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | /* |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 212 | * This is the state information which is persistent across opens. |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 213 | */ |
| 214 | struct uart_state { |
Alan Cox | df4f4dd | 2008-07-16 21:53:50 +0100 | [diff] [blame] | 215 | struct tty_port port; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 216 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 217 | int pm_state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | struct circ_buf xmit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 220 | struct uart_port *uart_port; |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 221 | }; |
| 222 | |
| 223 | #define UART_XMIT_SIZE PAGE_SIZE |
| 224 | |
| 225 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | /* number of characters left in xmit buffer before we ask for more */ |
| 227 | #define WAKEUP_CHARS 256 |
| 228 | |
| 229 | struct module; |
| 230 | struct tty_driver; |
| 231 | |
| 232 | struct uart_driver { |
| 233 | struct module *owner; |
| 234 | const char *driver_name; |
| 235 | const char *dev_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | int major; |
| 237 | int minor; |
| 238 | int nr; |
| 239 | struct console *cons; |
| 240 | |
| 241 | /* |
| 242 | * these are private; the low level driver should not |
| 243 | * touch these; they should be initialised to NULL |
| 244 | */ |
| 245 | struct uart_state *state; |
| 246 | struct tty_driver *tty_driver; |
| 247 | }; |
| 248 | |
| 249 | void uart_write_wakeup(struct uart_port *port); |
| 250 | |
| 251 | /* |
| 252 | * Baud rate helpers. |
| 253 | */ |
| 254 | void uart_update_timeout(struct uart_port *port, unsigned int cflag, |
| 255 | unsigned int baud); |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 256 | unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
| 257 | struct ktermios *old, unsigned int min, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | unsigned int max); |
| 259 | unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud); |
| 260 | |
Anton Vorontsov | 5438106 | 2010-10-01 17:21:25 +0400 | [diff] [blame] | 261 | /* Base timer interval for polling */ |
| 262 | static inline int uart_poll_timeout(struct uart_port *port) |
| 263 | { |
| 264 | int timeout = port->timeout; |
| 265 | |
| 266 | return timeout > 6 ? (timeout / 2 - 2) : 1; |
| 267 | } |
| 268 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | /* |
| 270 | * Console helpers. |
| 271 | */ |
| 272 | struct uart_port *uart_get_console(struct uart_port *ports, int nr, |
| 273 | struct console *c); |
| 274 | void uart_parse_options(char *options, int *baud, int *parity, int *bits, |
| 275 | int *flow); |
| 276 | int uart_set_options(struct uart_port *port, struct console *co, int baud, |
| 277 | int parity, int bits, int flow); |
| 278 | struct tty_driver *uart_console_device(struct console *co, int *index); |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 279 | void uart_console_write(struct uart_port *port, const char *s, |
| 280 | unsigned int count, |
| 281 | void (*putchar)(struct uart_port *, int)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
| 283 | /* |
| 284 | * Port/driver registration/removal |
| 285 | */ |
| 286 | int uart_register_driver(struct uart_driver *uart); |
| 287 | void uart_unregister_driver(struct uart_driver *uart); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | int uart_add_one_port(struct uart_driver *reg, struct uart_port *port); |
| 289 | int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port); |
| 290 | int uart_match_port(struct uart_port *port1, struct uart_port *port2); |
| 291 | |
| 292 | /* |
| 293 | * Power Management |
| 294 | */ |
| 295 | int uart_suspend_port(struct uart_driver *reg, struct uart_port *port); |
| 296 | int uart_resume_port(struct uart_driver *reg, struct uart_port *port); |
| 297 | |
| 298 | #define uart_circ_empty(circ) ((circ)->head == (circ)->tail) |
| 299 | #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0) |
| 300 | |
| 301 | #define uart_circ_chars_pending(circ) \ |
| 302 | (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE)) |
| 303 | |
| 304 | #define uart_circ_chars_free(circ) \ |
| 305 | (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE)) |
| 306 | |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 307 | static inline int uart_tx_stopped(struct uart_port *port) |
| 308 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 309 | struct tty_struct *tty = port->state->port.tty; |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 310 | if(tty->stopped || tty->hw_stopped) |
| 311 | return 1; |
| 312 | return 0; |
| 313 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | |
| 315 | /* |
| 316 | * The following are helper functions for the low level drivers. |
| 317 | */ |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 318 | |
| 319 | extern void uart_handle_dcd_change(struct uart_port *uport, |
| 320 | unsigned int status); |
| 321 | extern void uart_handle_cts_change(struct uart_port *uport, |
| 322 | unsigned int status); |
| 323 | |
| 324 | extern void uart_insert_char(struct uart_port *port, unsigned int status, |
| 325 | unsigned int overrun, unsigned int ch, unsigned int flag); |
| 326 | |
| 327 | #ifdef SUPPORT_SYSRQ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | static inline int |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 329 | uart_handle_sysrq_char(struct uart_port *port, unsigned int ch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | { |
| 331 | if (port->sysrq) { |
| 332 | if (ch && time_before(jiffies, port->sysrq)) { |
Dmitry Torokhov | f335397 | 2010-08-17 21:15:47 -0700 | [diff] [blame] | 333 | handle_sysrq(ch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | port->sysrq = 0; |
| 335 | return 1; |
| 336 | } |
| 337 | port->sysrq = 0; |
| 338 | } |
| 339 | return 0; |
| 340 | } |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 341 | #else |
| 342 | #define uart_handle_sysrq_char(port,ch) ({ (void)port; 0; }) |
Linus Torvalds | 4e14918 | 2005-09-08 14:47:12 -0700 | [diff] [blame] | 343 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
| 345 | /* |
| 346 | * We do the SysRQ and SAK checking like this... |
| 347 | */ |
| 348 | static inline int uart_handle_break(struct uart_port *port) |
| 349 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 350 | struct uart_state *state = port->state; |
Dan Williams | bf03f65 | 2012-04-10 14:10:53 -0700 | [diff] [blame] | 351 | |
| 352 | if (port->handle_break) |
| 353 | port->handle_break(port); |
| 354 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | #ifdef SUPPORT_SYSRQ |
| 356 | if (port->cons && port->cons->index == port->line) { |
| 357 | if (!port->sysrq) { |
| 358 | port->sysrq = jiffies + HZ*5; |
| 359 | return 1; |
| 360 | } |
| 361 | port->sysrq = 0; |
| 362 | } |
| 363 | #endif |
Russell King | 27ae7a7 | 2006-01-21 22:54:06 +0000 | [diff] [blame] | 364 | if (port->flags & UPF_SAK) |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 365 | do_SAK(state->port.tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | return 0; |
| 367 | } |
| 368 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | /* |
| 370 | * UART_ENABLE_MS - determine if port should enable modem status irqs |
| 371 | */ |
| 372 | #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \ |
| 373 | (cflag) & CRTSCTS || \ |
| 374 | !((cflag) & CLOCAL)) |
| 375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | #endif /* LINUX_SERIAL_CORE_H */ |