From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/include/linux/serial_core.h | 478 +++++++++++++++++++++++++++++++++++++ 1 file changed, 478 insertions(+) create mode 100644 kernel/include/linux/serial_core.h (limited to 'kernel/include/linux/serial_core.h') diff --git a/kernel/include/linux/serial_core.h b/kernel/include/linux/serial_core.h new file mode 100644 index 000000000..025dad9dc --- /dev/null +++ b/kernel/include/linux/serial_core.h @@ -0,0 +1,478 @@ +/* + * linux/drivers/char/serial_core.h + * + * Copyright (C) 2000 Deep Blue Solutions Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#ifndef LINUX_SERIAL_CORE_H +#define LINUX_SERIAL_CORE_H + + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef CONFIG_SERIAL_CORE_CONSOLE +#define uart_console(port) \ + ((port)->cons && (port)->cons->index == (port)->line) +#else +#define uart_console(port) (0) +#endif + +struct uart_port; +struct serial_struct; +struct device; + +/* + * This structure describes all the operations that can be done on the + * physical hardware. See Documentation/serial/driver for details. + */ +struct uart_ops { + unsigned int (*tx_empty)(struct uart_port *); + void (*set_mctrl)(struct uart_port *, unsigned int mctrl); + unsigned int (*get_mctrl)(struct uart_port *); + void (*stop_tx)(struct uart_port *); + void (*start_tx)(struct uart_port *); + void (*throttle)(struct uart_port *); + void (*unthrottle)(struct uart_port *); + void (*send_xchar)(struct uart_port *, char ch); + void (*stop_rx)(struct uart_port *); + void (*enable_ms)(struct uart_port *); + void (*break_ctl)(struct uart_port *, int ctl); + int (*startup)(struct uart_port *); + void (*shutdown)(struct uart_port *); + void (*flush_buffer)(struct uart_port *); + void (*set_termios)(struct uart_port *, struct ktermios *new, + struct ktermios *old); + void (*set_ldisc)(struct uart_port *, struct ktermios *); + void (*pm)(struct uart_port *, unsigned int state, + unsigned int oldstate); + + /* + * Return a string describing the type of the port + */ + const char *(*type)(struct uart_port *); + + /* + * Release IO and memory resources used by the port. + * This includes iounmap if necessary. + */ + void (*release_port)(struct uart_port *); + + /* + * Request IO and memory resources used by the port. + * This includes iomapping the port if necessary. + */ + int (*request_port)(struct uart_port *); + void (*config_port)(struct uart_port *, int); + int (*verify_port)(struct uart_port *, struct serial_struct *); + int (*ioctl)(struct uart_port *, unsigned int, unsigned long); +#ifdef CONFIG_CONSOLE_POLL + int (*poll_init)(struct uart_port *); + void (*poll_put_char)(struct uart_port *, unsigned char); + int (*poll_get_char)(struct uart_port *); +#endif +}; + +#define NO_POLL_CHAR 0x00ff0000 +#define UART_CONFIG_TYPE (1 << 0) +#define UART_CONFIG_IRQ (1 << 1) + +struct uart_icount { + __u32 cts; + __u32 dsr; + __u32 rng; + __u32 dcd; + __u32 rx; + __u32 tx; + __u32 frame; + __u32 overrun; + __u32 parity; + __u32 brk; + __u32 buf_overrun; +}; + +typedef unsigned int __bitwise__ upf_t; +typedef unsigned int __bitwise__ upstat_t; + +struct uart_port { + spinlock_t lock; /* port lock */ + unsigned long iobase; /* in/out[bwl] */ + unsigned char __iomem *membase; /* read/write[bwl] */ + unsigned int (*serial_in)(struct uart_port *, int); + void (*serial_out)(struct uart_port *, int, int); + void (*set_termios)(struct uart_port *, + struct ktermios *new, + struct ktermios *old); + void (*set_mctrl)(struct uart_port *, unsigned int); + int (*startup)(struct uart_port *port); + void (*shutdown)(struct uart_port *port); + void (*throttle)(struct uart_port *port); + void (*unthrottle)(struct uart_port *port); + int (*handle_irq)(struct uart_port *); + void (*pm)(struct uart_port *, unsigned int state, + unsigned int old); + void (*handle_break)(struct uart_port *); + int (*rs485_config)(struct uart_port *, + struct serial_rs485 *rs485); + unsigned int irq; /* irq number */ + unsigned long irqflags; /* irq flags */ + unsigned int uartclk; /* base uart clock */ + unsigned int fifosize; /* tx fifo size */ + unsigned char x_char; /* xon/xoff char */ + unsigned char regshift; /* reg offset shift */ + unsigned char iotype; /* io access style */ + unsigned char unused1; + +#define UPIO_PORT (SERIAL_IO_PORT) /* 8b I/O port access */ +#define UPIO_HUB6 (SERIAL_IO_HUB6) /* Hub6 ISA card */ +#define UPIO_MEM (SERIAL_IO_MEM) /* 8b MMIO access */ +#define UPIO_MEM32 (SERIAL_IO_MEM32) /* 32b little endian */ +#define UPIO_AU (SERIAL_IO_AU) /* Au1x00 and RT288x type IO */ +#define UPIO_TSI (SERIAL_IO_TSI) /* Tsi108/109 type IO */ +#define UPIO_MEM32BE (SERIAL_IO_MEM32BE) /* 32b big endian */ + + unsigned int read_status_mask; /* driver specific */ + unsigned int ignore_status_mask; /* driver specific */ + struct uart_state *state; /* pointer to parent state */ + struct uart_icount icount; /* statistics */ + + struct console *cons; /* struct console, if any */ +#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ) + unsigned long sysrq; /* sysrq timeout */ +#endif + + /* flags must be updated while holding port mutex */ + upf_t flags; + + /* + * These flags must be equivalent to the flags defined in + * include/uapi/linux/tty_flags.h which are the userspace definitions + * assigned from the serial_struct flags in uart_set_info() + * [for bit definitions in the UPF_CHANGE_MASK] + * + * Bits [0..UPF_LAST_USER] are userspace defined/visible/changeable + * except bit 15 (UPF_NO_TXEN_TEST) which is masked off. + * The remaining bits are serial-core specific and not modifiable by + * userspace. + */ +#define UPF_FOURPORT ((__force upf_t) ASYNC_FOURPORT /* 1 */ ) +#define UPF_SAK ((__force upf_t) ASYNC_SAK /* 2 */ ) +#define UPF_SPD_HI ((__force upf_t) ASYNC_SPD_HI /* 4 */ ) +#define UPF_SPD_VHI ((__force upf_t) ASYNC_SPD_VHI /* 5 */ ) +#define UPF_SPD_CUST ((__force upf_t) ASYNC_SPD_CUST /* 0x0030 */ ) +#define UPF_SPD_WARP ((__force upf_t) ASYNC_SPD_WARP /* 0x1010 */ ) +#define UPF_SPD_MASK ((__force upf_t) ASYNC_SPD_MASK /* 0x1030 */ ) +#define UPF_SKIP_TEST ((__force upf_t) ASYNC_SKIP_TEST /* 6 */ ) +#define UPF_AUTO_IRQ ((__force upf_t) ASYNC_AUTO_IRQ /* 7 */ ) +#define UPF_HARDPPS_CD ((__force upf_t) ASYNC_HARDPPS_CD /* 11 */ ) +#define UPF_SPD_SHI ((__force upf_t) ASYNC_SPD_SHI /* 12 */ ) +#define UPF_LOW_LATENCY ((__force upf_t) ASYNC_LOW_LATENCY /* 13 */ ) +#define UPF_BUGGY_UART ((__force upf_t) ASYNC_BUGGY_UART /* 14 */ ) +#define UPF_NO_TXEN_TEST ((__force upf_t) (1 << 15)) +#define UPF_MAGIC_MULTIPLIER ((__force upf_t) ASYNC_MAGIC_MULTIPLIER /* 16 */ ) + +/* Port has hardware-assisted h/w flow control */ +#define UPF_AUTO_CTS ((__force upf_t) (1 << 20)) +#define UPF_AUTO_RTS ((__force upf_t) (1 << 21)) +#define UPF_HARD_FLOW ((__force upf_t) (UPF_AUTO_CTS | UPF_AUTO_RTS)) +/* Port has hardware-assisted s/w flow control */ +#define UPF_SOFT_FLOW ((__force upf_t) (1 << 22)) +#define UPF_CONS_FLOW ((__force upf_t) (1 << 23)) +#define UPF_SHARE_IRQ ((__force upf_t) (1 << 24)) +#define UPF_EXAR_EFR ((__force upf_t) (1 << 25)) +#define UPF_BUG_THRE ((__force upf_t) (1 << 26)) +/* The exact UART type is known and should not be probed. */ +#define UPF_FIXED_TYPE ((__force upf_t) (1 << 27)) +#define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28)) +#define UPF_FIXED_PORT ((__force upf_t) (1 << 29)) +#define UPF_DEAD ((__force upf_t) (1 << 30)) +#define UPF_IOREMAP ((__force upf_t) (1 << 31)) + +#define __UPF_CHANGE_MASK 0x17fff +#define UPF_CHANGE_MASK ((__force upf_t) __UPF_CHANGE_MASK) +#define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY)) + +#if __UPF_CHANGE_MASK > ASYNC_FLAGS +#error Change mask not equivalent to userspace-visible bit defines +#endif + + /* + * Must hold termios_rwsem, port mutex and port lock to change; + * can hold any one lock to read. + */ + upstat_t status; + +#define UPSTAT_CTS_ENABLE ((__force upstat_t) (1 << 0)) +#define UPSTAT_DCD_ENABLE ((__force upstat_t) (1 << 1)) +#define UPSTAT_AUTORTS ((__force upstat_t) (1 << 2)) +#define UPSTAT_AUTOCTS ((__force upstat_t) (1 << 3)) +#define UPSTAT_AUTOXOFF ((__force upstat_t) (1 << 4)) + + int hw_stopped; /* sw-assisted CTS flow state */ + unsigned int mctrl; /* current modem ctrl settings */ + unsigned int timeout; /* character-based timeout */ + unsigned int type; /* port type */ + const struct uart_ops *ops; + unsigned int custom_divisor; + unsigned int line; /* port index */ + unsigned int minor; + resource_size_t mapbase; /* for ioremap */ + resource_size_t mapsize; + struct device *dev; /* parent device */ + unsigned char hub6; /* this should be in the 8250 driver */ + unsigned char suspended; + unsigned char irq_wake; + unsigned char unused[2]; + struct attribute_group *attr_group; /* port specific attributes */ + const struct attribute_group **tty_groups; /* all attributes (serial core use only) */ + struct serial_rs485 rs485; + void *private_data; /* generic platform data pointer */ +}; + +static inline int serial_port_in(struct uart_port *up, int offset) +{ + return up->serial_in(up, offset); +} + +static inline void serial_port_out(struct uart_port *up, int offset, int value) +{ + up->serial_out(up, offset, value); +} + +/** + * enum uart_pm_state - power states for UARTs + * @UART_PM_STATE_ON: UART is powered, up and operational + * @UART_PM_STATE_OFF: UART is powered off + * @UART_PM_STATE_UNDEFINED: sentinel + */ +enum uart_pm_state { + UART_PM_STATE_ON = 0, + UART_PM_STATE_OFF = 3, /* number taken from ACPI */ + UART_PM_STATE_UNDEFINED, +}; + +/* + * This is the state information which is persistent across opens. + */ +struct uart_state { + struct tty_port port; + + enum uart_pm_state pm_state; + struct circ_buf xmit; + + struct uart_port *uart_port; +}; + +#define UART_XMIT_SIZE PAGE_SIZE + + +/* number of characters left in xmit buffer before we ask for more */ +#define WAKEUP_CHARS 256 + +struct module; +struct tty_driver; + +struct uart_driver { + struct module *owner; + const char *driver_name; + const char *dev_name; + int major; + int minor; + int nr; + struct console *cons; + + /* + * these are private; the low level driver should not + * touch these; they should be initialised to NULL + */ + struct uart_state *state; + struct tty_driver *tty_driver; +}; + +void uart_write_wakeup(struct uart_port *port); + +/* + * Baud rate helpers. + */ +void uart_update_timeout(struct uart_port *port, unsigned int cflag, + unsigned int baud); +unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, + struct ktermios *old, unsigned int min, + unsigned int max); +unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud); + +/* Base timer interval for polling */ +static inline int uart_poll_timeout(struct uart_port *port) +{ + int timeout = port->timeout; + + return timeout > 6 ? (timeout / 2 - 2) : 1; +} + +/* + * Console helpers. + */ +struct earlycon_device { + struct console *con; + struct uart_port port; + char options[16]; /* e.g., 115200n8 */ + unsigned int baud; +}; + +struct earlycon_id { + char name[16]; + int (*setup)(struct earlycon_device *, const char *options); +} __aligned(32); + +extern int setup_earlycon(char *buf); +extern int of_setup_earlycon(unsigned long addr, + int (*setup)(struct earlycon_device *, const char *)); + +#define EARLYCON_DECLARE(_name, func) \ + static const struct earlycon_id __earlycon_##_name \ + __used __section(__earlycon_table) \ + = { .name = __stringify(_name), \ + .setup = func } + +#define OF_EARLYCON_DECLARE(name, compat, fn) \ + _OF_DECLARE(earlycon, name, compat, fn, void *) + +struct uart_port *uart_get_console(struct uart_port *ports, int nr, + struct console *c); +int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr, + char **options); +void uart_parse_options(char *options, int *baud, int *parity, int *bits, + int *flow); +int uart_set_options(struct uart_port *port, struct console *co, int baud, + int parity, int bits, int flow); +struct tty_driver *uart_console_device(struct console *co, int *index); +void uart_console_write(struct uart_port *port, const char *s, + unsigned int count, + void (*putchar)(struct uart_port *, int)); + +/* + * Port/driver registration/removal + */ +int uart_register_driver(struct uart_driver *uart); +void uart_unregister_driver(struct uart_driver *uart); +int uart_add_one_port(struct uart_driver *reg, struct uart_port *port); +int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port); +int uart_match_port(struct uart_port *port1, struct uart_port *port2); + +/* + * Power Management + */ +int uart_suspend_port(struct uart_driver *reg, struct uart_port *port); +int uart_resume_port(struct uart_driver *reg, struct uart_port *port); + +#define uart_circ_empty(circ) ((circ)->head == (circ)->tail) +#define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0) + +#define uart_circ_chars_pending(circ) \ + (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE)) + +#define uart_circ_chars_free(circ) \ + (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE)) + +static inline int uart_tx_stopped(struct uart_port *port) +{ + struct tty_struct *tty = port->state->port.tty; + if (tty->stopped || port->hw_stopped) + return 1; + return 0; +} + +static inline bool uart_cts_enabled(struct uart_port *uport) +{ + return !!(uport->status & UPSTAT_CTS_ENABLE); +} + +static inline bool uart_softcts_mode(struct uart_port *uport) +{ + upstat_t mask = UPSTAT_CTS_ENABLE | UPSTAT_AUTOCTS; + + return ((uport->status & mask) == UPSTAT_CTS_ENABLE); +} + +/* + * The following are helper functions for the low level drivers. + */ + +extern void uart_handle_dcd_change(struct uart_port *uport, + unsigned int status); +extern void uart_handle_cts_change(struct uart_port *uport, + unsigned int status); + +extern void uart_insert_char(struct uart_port *port, unsigned int status, + unsigned int overrun, unsigned int ch, unsigned int flag); + +#ifdef SUPPORT_SYSRQ +static inline int +uart_handle_sysrq_char(struct uart_port *port, unsigned int ch) +{ + if (port->sysrq) { + if (ch && time_before(jiffies, port->sysrq)) { + handle_sysrq(ch); + port->sysrq = 0; + return 1; + } + port->sysrq = 0; + } + return 0; +} +#else +#define uart_handle_sysrq_char(port,ch) ({ (void)port; 0; }) +#endif + +/* + * We do the SysRQ and SAK checking like this... + */ +static inline int uart_handle_break(struct uart_port *port) +{ + struct uart_state *state = port->state; + + if (port->handle_break) + port->handle_break(port); + +#ifdef SUPPORT_SYSRQ + if (port->cons && port->cons->index == port->line) { + if (!port->sysrq) { + port->sysrq = jiffies + HZ*5; + return 1; + } + port->sysrq = 0; + } +#endif + if (port->flags & UPF_SAK) + do_SAK(state->port.tty); + return 0; +} + +/* + * UART_ENABLE_MS - determine if port should enable modem status irqs + */ +#define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \ + (cflag) & CRTSCTS || \ + !((cflag) & CLOCAL)) + +#endif /* LINUX_SERIAL_CORE_H */ -- cgit 1.2.3-korg