2.2.17-21mdk/0040775000076400007640000000000007705256716011110 5ustar nogroup2.2.17-21mdk/serial.h0100644000000000000000000001630307705254200012654 0ustar rootroot/* * include/asm-i386/serial.h */ #include /* * This assumes you have a 1.8432 MHz clock for your UART. * * It'd be nice if someone built a serial card with a 24.576 MHz * clock, since the 16550A is capable of handling a top speed of 1.5 * megabits/second; but this requires the faster clock. */ #define BASE_BAUD ( 1843200 / 16 ) /* Standard COM flags (except for COM4, because of the 8514 problem) */ #ifdef CONFIG_SERIAL_DETECT_IRQ #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ) #define STD_COM4_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_AUTO_IRQ) #else #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST) #define STD_COM4_FLAGS ASYNC_BOOT_AUTOCONF #endif #ifdef CONFIG_SERIAL_MANY_PORTS #define FOURPORT_FLAGS ASYNC_FOURPORT #define ACCENT_FLAGS 0 #define BOCA_FLAGS 0 #define HUB6_FLAGS 0 #endif /* * The following define the access methods for the HUB6 card. All * access is through two ports for all 24 possible chips. The card is * selected through the high 2 bits, the port on that card with the * "middle" 3 bits, and the register on that port with the bottom * 3 bits. * * While the access port and interrupt is configurable, the default * port locations are 0x302 for the port control register, and 0x303 * for the data read/write register. Normally, the interrupt is at irq3 * but can be anything from 3 to 7 inclusive. Note that using 3 will * require disabling com2. */ #define C_P(card,port) (((card)<<6|(port)<<3) + 1) #define STD_SERIAL_PORT_DEFNS \ /* UART CLK PORT IRQ FLAGS */ \ { 0, BASE_BAUD, 0x3F8, 4, STD_COM_FLAGS }, /* ttyS0 */ \ { 0, BASE_BAUD, 0x2F8, 3, STD_COM_FLAGS }, /* ttyS1 */ \ { 0, BASE_BAUD, 0x3E8, 4, STD_COM_FLAGS }, /* ttyS2 */ \ { 0, BASE_BAUD, 0x2E8, 3, STD_COM4_FLAGS }, /* ttyS3 */ #ifdef CONFIG_SERIAL_MANY_PORTS #define EXTRA_SERIAL_PORT_DEFNS \ { 0, BASE_BAUD, 0x1A0, 9, FOURPORT_FLAGS }, /* ttyS4 */ \ { 0, BASE_BAUD, 0x1A8, 9, FOURPORT_FLAGS }, /* ttyS5 */ \ { 0, BASE_BAUD, 0x1B0, 9, FOURPORT_FLAGS }, /* ttyS6 */ \ { 0, BASE_BAUD, 0x1B8, 9, FOURPORT_FLAGS }, /* ttyS7 */ \ { 0, BASE_BAUD, 0x2A0, 5, FOURPORT_FLAGS }, /* ttyS8 */ \ { 0, BASE_BAUD, 0x2A8, 5, FOURPORT_FLAGS }, /* ttyS9 */ \ { 0, BASE_BAUD, 0x2B0, 5, FOURPORT_FLAGS }, /* ttyS10 */ \ { 0, BASE_BAUD, 0x2B8, 5, FOURPORT_FLAGS }, /* ttyS11 */ \ { 0, BASE_BAUD, 0x330, 4, ACCENT_FLAGS }, /* ttyS12 */ \ { 0, BASE_BAUD, 0x338, 4, ACCENT_FLAGS }, /* ttyS13 */ \ { 0, BASE_BAUD, 0x000, 0, 0 }, /* ttyS14 (spare) */ \ { 0, BASE_BAUD, 0x000, 0, 0 }, /* ttyS15 (spare) */ \ { 0, BASE_BAUD, 0x100, 12, BOCA_FLAGS }, /* ttyS16 */ \ { 0, BASE_BAUD, 0x108, 12, BOCA_FLAGS }, /* ttyS17 */ \ { 0, BASE_BAUD, 0x110, 12, BOCA_FLAGS }, /* ttyS18 */ \ { 0, BASE_BAUD, 0x118, 12, BOCA_FLAGS }, /* ttyS19 */ \ { 0, BASE_BAUD, 0x120, 12, BOCA_FLAGS }, /* ttyS20 */ \ { 0, BASE_BAUD, 0x128, 12, BOCA_FLAGS }, /* ttyS21 */ \ { 0, BASE_BAUD, 0x130, 12, BOCA_FLAGS }, /* ttyS22 */ \ { 0, BASE_BAUD, 0x138, 12, BOCA_FLAGS }, /* ttyS23 */ \ { 0, BASE_BAUD, 0x140, 12, BOCA_FLAGS }, /* ttyS24 */ \ { 0, BASE_BAUD, 0x148, 12, BOCA_FLAGS }, /* ttyS25 */ \ { 0, BASE_BAUD, 0x150, 12, BOCA_FLAGS }, /* ttyS26 */ \ { 0, BASE_BAUD, 0x158, 12, BOCA_FLAGS }, /* ttyS27 */ \ { 0, BASE_BAUD, 0x160, 12, BOCA_FLAGS }, /* ttyS28 */ \ { 0, BASE_BAUD, 0x168, 12, BOCA_FLAGS }, /* ttyS29 */ \ { 0, BASE_BAUD, 0x170, 12, BOCA_FLAGS }, /* ttyS30 */ \ { 0, BASE_BAUD, 0x178, 12, BOCA_FLAGS }, /* ttyS31 */ #else #define EXTRA_SERIAL_PORT_DEFNS #endif /* You can have up to four HUB6's in the system, but I've only * included two cards here for a total of twelve ports. */ #if (defined(CONFIG_HUB6) && defined(CONFIG_SERIAL_MANY_PORTS)) #define HUB6_SERIAL_PORT_DFNS \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,0) }, /* ttyS32 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,1) }, /* ttyS33 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,2) }, /* ttyS34 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,3) }, /* ttyS35 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,4) }, /* ttyS36 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,5) }, /* ttyS37 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,0) }, /* ttyS38 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,1) }, /* ttyS39 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,2) }, /* ttyS40 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,3) }, /* ttyS41 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,4) }, /* ttyS42 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,5) }, /* ttyS43 */ #else #define HUB6_SERIAL_PORT_DFNS #endif /* * Decision PCCOM PCI 2/4/8-port cards support * * You can have up to two cards in the system. */ #if (defined(CONFIG_DCIPCCOM_PCI) && defined(CONFIG_SERIAL_MANY_PORTS)) #ifndef CONFIG_HUB6 #undef HUB6_SERIAL_PORT_DFNS #define HUB6_SERIAL_PORT_DFNS \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,0) }, /* ttyS32 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,1) }, /* ttyS33 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,2) }, /* ttyS34 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,3) }, /* ttyS35 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,4) }, /* ttyS36 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,5) }, /* ttyS37 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,0) }, /* ttyS38 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,1) }, /* ttyS39 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,2) }, /* ttyS40 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,3) }, /* ttyS41 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,4) }, /* ttyS42 */ \ { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,5) }, /* ttyS43 */ #endif /* CONFIG_HUB6 */ #define DCIPCCOM_PCI_SERIAL_PORT_DFNS \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS44 */ \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS45 */ \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS46 */ \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS47 */ \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS48 */ \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS49 */ \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS50 */ \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS51 */ \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS52 */ \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS53 */ \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS54 */ \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS55 */ \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS56 */ \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS57 */ \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS58 */ \ { 0, BASE_BAUD, 0x0, 0, STD_COM_FLAGS }, /* ttyS59 */ #else #define DCIPCCOM_PCI_SERIAL_PORT_DFNS #endif #ifdef CONFIG_MCA #define MCA_SERIAL_PORT_DFNS \ { 0, BASE_BAUD, 0x3220, 3, STD_COM_FLAGS }, \ { 0, BASE_BAUD, 0x3228, 3, STD_COM_FLAGS }, \ { 0, BASE_BAUD, 0x4220, 3, STD_COM_FLAGS }, \ { 0, BASE_BAUD, 0x4228, 3, STD_COM_FLAGS }, \ { 0, BASE_BAUD, 0x5220, 3, STD_COM_FLAGS }, \ { 0, BASE_BAUD, 0x5228, 3, STD_COM_FLAGS }, #else #define MCA_SERIAL_PORT_DFNS #endif #define SERIAL_PORT_DFNS \ STD_SERIAL_PORT_DEFNS \ EXTRA_SERIAL_PORT_DEFNS \ HUB6_SERIAL_PORT_DFNS \ DCIPCCOM_PCI_SERIAL_PORT_DFNS \ MCA_SERIAL_PORT_DFNS 2.2.17-21mdk/readme.pci0100644000076400007640000001002107225655341013021 0ustar nogroup >>> Install Decision PCCOM PCI 4/8-Port Cards to LINUX 2.2.X <<< 1 Login as a root user. 2 Manually Configure the Decision PCCOM PCI 4/8 card driver into the LINUX Kernel 2.0 Overview 1> In the LINUX system, the source programs can be normally be found under /usr/src/linux. 2> The program file /usr/src/linux/drivers/char/serial.c is modified to be able to drive Decision PCCOM PCI 2/4/8-Port. 3> Totally, there are two files needed to be modified as follows. - serial.c in /usr/src/linux/drivers/char - serial.h in /usr/src/linux/include/asm 2.1 Replace /usr/src/linux/drivers/char/serial.c # cd /usr/src/linux/drivers/char; mv serial.c serial.c.old # mcopy a:serial.c /usr/src/linux/drivers/char 2.2 Replace /usr/src/linux/include/asm/serial.h # cd /usr/src/linux/include/asm; mv serial.h serial.h.old # mcopy a:serial.h /usr/src/linux/include/asm 3 Build the LINUX kernel with the Decision PCCOM PCI 2/4/8-Port Driver. 3.1 # cd /usr/src/linux 3.2 # make config When the following prompt messages displayed, Standard/generic serial support? (CONFIG_SERIAL) [N/y/?] Y | enter 'Y' + Extended dumb serial driver options (CONFIG_SERIAL_EXTENDED) [Y/n/?] Y | enter 'Y' + Support more than 4 serial ports (CONFIG_SERIAL_MANY_PORTS) [Y/n/?] | enter 'Y' + Support for sharing serial interrupts (CONFIG_SERIAL_SHARE_IRQ) [Y/n/?] | | enter 'Y' + Support special multiport boards (CONFIG_SERIAL_MULTIPORT) [Y/n/?] | | enter 'Y' + 3.3 # make depend 3.4 # make zlilo [bzImage | bzlilo] 4 Configure and enable serial ports 4.1 The patched serial driver enabled for Decision PCCOM PCI 2/4/8-port cards is able to support two cards at most. 4.2 The corresponding device nodes are ttyS44 - ttyS47, cua44 - cua47 for the first 4-Port card, ttyS52 - ttyS55, cua52 - cua55 for the second 4-Port card, ttyS44 - ttyS51, cua44 - cua51 for the first 8-Port card, ttyS52 - ttyS59, cua52 - cua59 for the second 8-Port card. ttyS44 - ttyS45, cua44 - cua45 for the first 2-Port card, ttyS52 - ttyS53, cua52 - cua53 for the second 2-Port card. 4.3 Make these device nodes of (ttyS44 - ttyS59, and cua44 - cua59) if they are not existent # cd /dev # MAKEDEV ttyS44 ttyS45 ttyS46 ttyS47 ttyS48 ttyS49 ttyS50 ttyS51 # MAKEDEV ttyS52 ttyS53 ttyS54 ttyS55 ttyS56 ttyS57 ttyS58 ttyS59 4.4 Enable serial ports 4.4.1 # cd /etc/rc.d 4.4.2 edit rc.serial 4.4.3 use the utilities "setserial" to enable corresponding cards respectively and add the following lines as follows: ${SETSERIAL} /dev/ttyS44 ${AUTO_IRQ} autoconfig ${SETSERIAL} /dev/ttyS45 ${AUTO_IRQ} autoconfig ${SETSERIAL} /dev/ttyS46 ${AUTO_IRQ} autoconfig ${SETSERIAL} /dev/ttyS47 ${AUTO_IRQ} autoconfig ${SETSERIAL} /dev/ttyS48 ${AUTO_IRQ} autoconfig ${SETSERIAL} /dev/ttyS49 ${AUTO_IRQ} autoconfig ${SETSERIAL} /dev/ttyS50 ${AUTO_IRQ} autoconfig ${SETSERIAL} /dev/ttyS51 ${AUTO_IRQ} autoconfig 5 Reboot your LIUNX system to startup the new kernel and environment 2.2.17-21mdk/serial.c0100644000000000000000000030404107705256466012666 0ustar rootroot/* * linux/drivers/char/serial.c * * Copyright (C) 1991, 1992 Linus Torvalds * * Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92. Now * much more extensible to support other serial cards based on the * 16450/16550A UART's. Added support for the AST FourPort and the * Accent Async board. * * set_serial_info fixed to set the flags, custom divisor, and uart * type fields. Fix suggested by Michael K. Johnson 12/12/92. * * 11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis * * 03/96: Modularised by Angelo Haritsis * * rs_set_termios fixed to look also for changes of the input * flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK. * Bernd Anhäupl 05/17/96. * * 1/97: Extended dumb serial ports are a config option now. * Saves 4k. Michael A. Griffith * * 8/97: Fix bug in rs_set_termios with RTS * Stanislav V. Voronyi * * 3/98: Change the IRQ detection, use of probe_irq_o*(), * supress TIOCSERGWILD and TIOCSERSWILD * Etienne Lorrain * * 4/98: Added changes to support the ARM architecture proposed by * Russell King * * This module exports the following rs232 io functions: * * int rs_init(void); */ /* * Serial driver configuration section. Here are the various options: * * CONFIG_DCIPCCOM_PCI * Enable support for the Decision PCCOM PCI 4/8-Port * cards if CONFIG_PCI is defined * * CONFIG_HUB6 * Enables support for the venerable Bell Technologies * HUB6 card. * * CONFIG_SERIAL_MANY_PORTS * Enables support for ports beyond the standard, stupid * COM 1/2/3/4. * * CONFIG_SERIAL_MULTIPORT * Enables support for special multiport board support. * * CONFIG_SERIAL_SHARE_IRQ * Enables support for multiple serial ports on one IRQ * * CONFIG_SERIAL_DETECT_IRQ * Enable the autodetection of IRQ on standart ports * * SERIAL_PARANOIA_CHECK * Check the magic number for the async_structure where * ever possible. */ #include #define CONFIG_DCIPCCOM_PCI #undef SERIAL_PARANOIA_CHECK #define CONFIG_SERIAL_NOPAUSE_IO #define SERIAL_DO_RESTART #if 0 /* Normally these defines are controlled by the autoconf.h */ #define CONFIG_SERIAL_MANY_PORTS #define CONFIG_SERIAL_SHARE_IRQ #define CONFIG_SERIAL_DETECT_IRQ #define CONFIG_SERIAL_MULTIPORT #define CONFIG_HUB6 #endif /* Sanity checks */ #ifdef CONFIG_SERIAL_MULTIPORT #ifndef CONFIG_SERIAL_SHARE_IRQ #define CONFIG_SERIAL_SHARE_IRQ #endif #endif #ifdef CONFIG_HUB6 #ifndef CONFIG_SERIAL_MANY_PORTS #define CONFIG_SERIAL_MANY_PORTS #endif #ifndef CONFIG_SERIAL_SHARE_IRQ #define CONFIG_SERIAL_SHARE_IRQ #endif #endif /* Set of debugging defines */ #undef SERIAL_DEBUG_INTR #undef SERIAL_DEBUG_OPEN #undef SERIAL_DEBUG_FLOW #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT #define RS_STROBE_TIME (10*HZ) #define RS_ISR_PASS_LIMIT 256 #define IRQ_T(state) \ ((state->flags & ASYNC_SHARE_IRQ) ? SA_SHIRQ : SA_INTERRUPT) #define SERIAL_INLINE #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ kdevname(tty->device), (info->flags), serial_refcount,info->count,tty->count,s) #else #define DBG_CNT(s) #endif /* * End of serial driver configuration section. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_SERIAL_CONSOLE #include #include #endif #ifdef CONFIG_PCI #include #endif /* CONFIG_PCI */ #include #include #include #include #include #include #ifdef SERIAL_INLINE #define _INLINE_ inline #endif static char *serial_name = "Serial driver"; static char *serial_version = "4.27"; static DECLARE_TASK_QUEUE(tq_serial); static struct tty_driver serial_driver, callout_driver; static int serial_refcount; /* number of characters left in xmit buffer before we ask for more */ #define WAKEUP_CHARS 256 /* * IRQ_timeout - How long the timeout should be for each IRQ * should be after the IRQ has been active. */ static struct async_struct *IRQ_ports[NR_IRQS]; #ifdef CONFIG_SERIAL_MULTIPORT static struct rs_multiport_struct rs_multiport[NR_IRQS]; #endif static int IRQ_timeout[NR_IRQS]; #ifdef CONFIG_SERIAL_CONSOLE static struct console sercons; # ifdef CONFIG_MAGIC_SYSRQ static int sysrq_pressed; /* break, really ... */ # endif #endif #ifdef CONFIG_DCIPCCOM_PCI /* * Programming Interface */ #define PCI_PI_SERIAL_XT 0x00 #define PCI_PI_SERIAL_16450 0x01 #define PCI_PI_SERIAL_16550 0x02 #define PCI_PI_SERIAL_16650 0x03 /* * Vendor */ #define PCI_DECISION 0x6666 /* * Class-, SubClass-, and Vendor-specific */ #define PCI_DC_SIO_PORT 0x2F #define PCI_DC_SIO_2P 0x00 #define PCI_DC_SIO_4P 0x01 #define PCI_DC_SIO_8P 0x02 #define PCI_DC_SIO_16P 0x03 #define PCI_DC_SIO_TYPE 0x2E #define PCI_DC_SIO_RS232 0x00 #define PCI_DC_SIO_RS422 0x01 #define PCI_DC_SIO_RS485 0x02 /* * Hardware configuration */ #define PCCOM_PCI_VECT_2P(base) (base + 0x10) #define PCCOM_PCI_SWID_2P(base) (base + 0x10) #define PCCOM_PCI_VECT_4P(base) (base + 0x20) #define PCCOM_PCI_SWID_4P(base) (base + 0x20) #define PCCOM_PCI_VECT_8P(base) (base + 0x40) #define PCCOM_PCI_SWID_8P(base) (base + 0x80) #endif /* CONFIG_DCIPCCOM_PCI */ static unsigned detect_uart_irq (struct serial_state * state); static void autoconfig(struct serial_state * info); static void change_speed(struct async_struct *info, struct termios *old); static void rs_wait_until_sent(struct tty_struct *tty, int timeout); /* * Here we define the default xmit fifo size used for each type of * UART */ static struct serial_uart_config uart_config[] = { { "unknown", 1, 0 }, { "8250", 1, 0 }, { "16450", 1, 0 }, { "16550", 1, 0 }, { "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO }, { "cirrus", 1, 0 }, { "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH }, { "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH }, { "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO}, { 0, 0} }; static struct serial_state rs_table[] = { SERIAL_PORT_DFNS /* Defined in serial.h */ }; #define NR_PORTS (sizeof(rs_table)/sizeof(struct serial_state)) static struct tty_struct *serial_table[NR_PORTS]; static struct termios *serial_termios[NR_PORTS]; static struct termios *serial_termios_locked[NR_PORTS]; #ifdef CONFIG_DCIPCCOM_PCI #define serial_dcpci_nr_cards 2 #define serial_dcpci_minor1 44 #define serial_dcpci_minor2 52 static int serial_dcpci_minor[serial_dcpci_nr_cards] = { serial_dcpci_minor1, serial_dcpci_minor2 }; #endif /* CONFIG_DCIPCCOM_PCI */ #ifndef MIN #define MIN(a,b) ((a) < (b) ? (a) : (b)) #endif /* * tmp_buf is used as a temporary buffer by serial_write. We need to * lock it in case the copy_from_user blocks while swapping in a page, * and some other program tries to do a serial write at the same time. * Since the lock will only come under contention when the system is * swapping and available memory is low, it makes sense to share one * buffer across all the serial ports, since it significantly saves * memory if large numbers of serial ports are open. */ static unsigned char *tmp_buf; static struct semaphore tmp_buf_sem = MUTEX; static inline int serial_paranoia_check(struct async_struct *info, kdev_t device, const char *routine) { #ifdef SERIAL_PARANOIA_CHECK static const char *badmagic = "Warning: bad magic number for serial struct (%s) in %s\n"; static const char *badinfo = "Warning: null async_struct for (%s) in %s\n"; if (!info) { printk(badinfo, kdevname(device), routine); return 1; } if (info->magic != SERIAL_MAGIC) { printk(badmagic, kdevname(device), routine); return 1; } #endif return 0; } static inline unsigned int serial_in(struct async_struct *info, int offset) { #ifdef CONFIG_HUB6 if (info->hub6) { outb(info->hub6 - 1 + offset, info->port); return inb(info->port+1); } else #endif return inb(info->port + offset); } static inline unsigned int serial_inp(struct async_struct *info, int offset) { #ifdef CONFIG_HUB6 if (info->hub6) { outb(info->hub6 - 1 + offset, info->port); return inb_p(info->port+1); } else #endif #ifdef CONFIG_SERIAL_NOPAUSE_IO return inb(info->port + offset); #else return inb_p(info->port + offset); #endif } static inline void serial_out(struct async_struct *info, int offset, int value) { #ifdef CONFIG_HUB6 if (info->hub6) { outb(info->hub6 - 1 + offset, info->port); outb(value, info->port+1); } else #endif outb(value, info->port+offset); } static inline void serial_outp(struct async_struct *info, int offset, int value) { #ifdef CONFIG_HUB6 if (info->hub6) { outb(info->hub6 - 1 + offset, info->port); outb_p(value, info->port+1); } else #endif #ifdef CONFIG_SERIAL_NOPAUSE_IO outb(value, info->port+offset); #else outb_p(value, info->port+offset); #endif } /* * ------------------------------------------------------------ * rs_stop() and rs_start() * * This routines are called before setting or resetting tty->stopped. * They enable or disable transmitter interrupts, as necessary. * ------------------------------------------------------------ */ static void rs_stop(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_stop")) return; save_flags(flags); cli(); if (info->IER & UART_IER_THRI) { info->IER &= ~UART_IER_THRI; serial_out(info, UART_IER, info->IER); } restore_flags(flags); } static void rs_start(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_start")) return; save_flags(flags); cli(); if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) { info->IER |= UART_IER_THRI; serial_out(info, UART_IER, info->IER); } restore_flags(flags); } /* * ---------------------------------------------------------------------- * * Here starts the interrupt handling routines. All of the following * subroutines are declared as inline and are folded into * rs_interrupt(). They were separated out for readability's sake. * * Note: rs_interrupt() is a "fast" interrupt, which means that it * runs with interrupts turned off. People who may want to modify * rs_interrupt() should try to keep the interrupt handler as fast as * possible. After you are done making modifications, it is not a bad * idea to do: * * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c * * and look at the resulting assemble code in serial.s. * * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 * ----------------------------------------------------------------------- */ /* * This routine is used by the interrupt handler to schedule * processing in the software interrupt portion of the driver. */ static _INLINE_ void rs_sched_event(struct async_struct *info, int event) { info->event |= 1 << event; queue_task(&info->tqueue, &tq_serial); mark_bh(SERIAL_BH); } static _INLINE_ void receive_chars(struct async_struct *info, int *status, struct pt_regs * regs) { struct tty_struct *tty = info->tty; unsigned char ch; int ignored = 0; struct async_icount *icount; icount = &info->state->icount; do { ch = serial_inp(info, UART_RX); if (tty->flip.count >= TTY_FLIPBUF_SIZE) break; *tty->flip.char_buf_ptr = ch; icount->rx++; #ifdef SERIAL_DEBUG_INTR printk("DR%02x:%02x...", ch, *status); #endif *tty->flip.flag_buf_ptr = 0; if (*status & (UART_LSR_BI | UART_LSR_PE | UART_LSR_FE | UART_LSR_OE)) { /* * For statistics only */ if (*status & UART_LSR_BI) { #if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) if (info->line == sercons.index) { if (!sysrq_pressed) { sysrq_pressed = jiffies; goto ignore_char; } sysrq_pressed = 0; } #endif *status &= ~(UART_LSR_FE | UART_LSR_PE); icount->brk++; } else if (*status & UART_LSR_PE) icount->parity++; else if (*status & UART_LSR_FE) icount->frame++; if (*status & UART_LSR_OE) icount->overrun++; /* * Now check to see if character should be * ignored, and mask off conditions which * should be ignored. */ if (*status & info->ignore_status_mask) { if (++ignored > 100) break; goto ignore_char; } *status &= info->read_status_mask; if (*status & (UART_LSR_BI)) { #ifdef SERIAL_DEBUG_INTR printk("handling break...."); #endif *tty->flip.flag_buf_ptr = TTY_BREAK; if (info->flags & ASYNC_SAK) do_SAK(tty); } else if (*status & UART_LSR_PE) *tty->flip.flag_buf_ptr = TTY_PARITY; else if (*status & UART_LSR_FE) *tty->flip.flag_buf_ptr = TTY_FRAME; if (*status & UART_LSR_OE) { /* * Overrun is special, since it's * reported immediately, and doesn't * affect the current character */ if (tty->flip.count < TTY_FLIPBUF_SIZE) { tty->flip.count++; tty->flip.flag_buf_ptr++; tty->flip.char_buf_ptr++; *tty->flip.flag_buf_ptr = TTY_OVERRUN; } } } #if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) if (sysrq_pressed && info->line == sercons.index) { if (ch != 0 && time_before(jiffies, sysrq_pressed + HZ*5)) { handle_sysrq(ch, regs, NULL, NULL); sysrq_pressed = 0; goto ignore_char; } sysrq_pressed = 0; } #endif tty->flip.flag_buf_ptr++; tty->flip.char_buf_ptr++; tty->flip.count++; ignore_char: *status = serial_inp(info, UART_LSR); } while (*status & UART_LSR_DR); tty_flip_buffer_push(tty); } static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done) { int count; if (info->x_char) { serial_outp(info, UART_TX, info->x_char); info->state->icount.tx++; info->x_char = 0; if (intr_done) *intr_done = 0; return; } if ((info->xmit_cnt <= 0) || info->tty->stopped || info->tty->hw_stopped) { info->IER &= ~UART_IER_THRI; serial_out(info, UART_IER, info->IER); return; } count = info->xmit_fifo_size; do { serial_out(info, UART_TX, info->xmit_buf[info->xmit_tail++]); info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); info->state->icount.tx++; if (--info->xmit_cnt <= 0) break; } while (--count > 0); if (info->xmit_cnt < WAKEUP_CHARS) rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); #ifdef SERIAL_DEBUG_INTR printk("THRE..."); #endif if (intr_done) *intr_done = 0; if (info->xmit_cnt <= 0) { info->IER &= ~UART_IER_THRI; serial_out(info, UART_IER, info->IER); } } static _INLINE_ void check_modem_status(struct async_struct *info) { int status; struct async_icount *icount; status = serial_in(info, UART_MSR); if (status & UART_MSR_ANY_DELTA) { icount = &info->state->icount; /* update input line counters */ if (status & UART_MSR_TERI) icount->rng++; if (status & UART_MSR_DDSR) icount->dsr++; if (status & UART_MSR_DDCD) { icount->dcd++; #ifdef CONFIG_HARD_PPS if ((info->flags & ASYNC_HARDPPS_CD) && (status & UART_MSR_DCD)) hardpps(); #endif } if (status & UART_MSR_DCTS) icount->cts++; wake_up_interruptible(&info->delta_msr_wait); } if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) { #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) printk("ttys%d CD now %s...", info->line, (status & UART_MSR_DCD) ? "on" : "off"); #endif if (status & UART_MSR_DCD) wake_up_interruptible(&info->open_wait); else if (!((info->flags & ASYNC_CALLOUT_ACTIVE) && (info->flags & ASYNC_CALLOUT_NOHUP))) { #ifdef SERIAL_DEBUG_OPEN printk("doing serial hangup..."); #endif if (info->tty) tty_hangup(info->tty); } } if (info->flags & ASYNC_CTS_FLOW) { if (info->tty->hw_stopped) { if (status & UART_MSR_CTS) { #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) printk("CTS tx start..."); #endif info->tty->hw_stopped = 0; info->IER |= UART_IER_THRI; serial_out(info, UART_IER, info->IER); rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); return; } } else { if (!(status & UART_MSR_CTS)) { #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) printk("CTS tx stop..."); #endif info->tty->hw_stopped = 1; info->IER &= ~UART_IER_THRI; serial_out(info, UART_IER, info->IER); } } } } #ifdef CONFIG_SERIAL_SHARE_IRQ /* * This is the serial driver's generic interrupt routine */ static void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs) { int status; struct async_struct * info; int pass_counter = 0; struct async_struct *end_mark = 0; #ifdef CONFIG_SERIAL_MULTIPORT int first_multi = 0; struct rs_multiport_struct *multi; #endif #ifdef SERIAL_DEBUG_INTR printk("rs_interrupt(%d)...", irq); #endif info = IRQ_ports[irq]; if (!info) return; #ifdef CONFIG_SERIAL_MULTIPORT multi = &rs_multiport[irq]; if (multi->port_monitor) first_multi = inb(multi->port_monitor); #endif do { if (!info->tty || (serial_in(info, UART_IIR) & UART_IIR_NO_INT)) { if (!end_mark) end_mark = info; goto next; } end_mark = 0; info->last_active = jiffies; status = serial_inp(info, UART_LSR); #ifdef SERIAL_DEBUG_INTR printk("status = %x...", status); #endif if (status & UART_LSR_DR) receive_chars(info, &status, regs); check_modem_status(info); if (status & UART_LSR_THRE) transmit_chars(info, 0); next: info = info->next_port; if (!info) { info = IRQ_ports[irq]; if (pass_counter++ > RS_ISR_PASS_LIMIT) { #if 0 printk("rs loop break\n"); #endif break; /* Prevent infinite loops */ } continue; } } while (end_mark != info); #ifdef CONFIG_SERIAL_MULTIPORT if (multi->port_monitor) printk("rs port monitor (normal) irq %d: 0x%x, 0x%x\n", info->state->irq, first_multi, inb(multi->port_monitor)); #endif #ifdef SERIAL_DEBUG_INTR printk("end.\n"); #endif } #endif /* #ifdef CONFIG_SERIAL_SHARE_IRQ */ /* * This is the serial driver's interrupt routine for a single port */ static void rs_interrupt_single(int irq, void *dev_id, struct pt_regs * regs) { int status; int pass_counter = 0; struct async_struct * info; #ifdef CONFIG_SERIAL_MULTIPORT int first_multi = 0; struct rs_multiport_struct *multi; #endif #ifdef SERIAL_DEBUG_INTR printk("rs_interrupt_single(%d)...", irq); #endif info = IRQ_ports[irq]; if (!info || !info->tty) return; #ifdef CONFIG_SERIAL_MULTIPORT multi = &rs_multiport[irq]; if (multi->port_monitor) first_multi = inb(multi->port_monitor); #endif do { status = serial_inp(info, UART_LSR); #ifdef SERIAL_DEBUG_INTR printk("status = %x...", status); #endif if (status & UART_LSR_DR) receive_chars(info, &status, regs); check_modem_status(info); if (status & UART_LSR_THRE) transmit_chars(info, 0); if (pass_counter++ > RS_ISR_PASS_LIMIT) { #if 0 printk("rs_single loop break.\n"); #endif break; } } while (!(serial_in(info, UART_IIR) & UART_IIR_NO_INT)); info->last_active = jiffies; #ifdef CONFIG_SERIAL_MULTIPORT if (multi->port_monitor) printk("rs port monitor (single) irq %d: 0x%x, 0x%x\n", info->state->irq, first_multi, inb(multi->port_monitor)); #endif #ifdef SERIAL_DEBUG_INTR printk("end.\n"); #endif } #ifdef CONFIG_SERIAL_MULTIPORT /* * This is the serial driver's for multiport boards */ static void rs_interrupt_multi(int irq, void *dev_id, struct pt_regs * regs) { int status; struct async_struct * info; int pass_counter = 0; int first_multi= 0; struct rs_multiport_struct *multi; #ifdef SERIAL_DEBUG_INTR printk("rs_interrupt_multi(%d)...", irq); #endif info = IRQ_ports[irq]; if (!info) return; multi = &rs_multiport[irq]; if (!multi->port1) { /* Should never happen */ printk("rs_interrupt_multi: NULL port1!\n"); return; } if (multi->port_monitor) first_multi = inb(multi->port_monitor); while (1) { if (!info->tty || (serial_in(info, UART_IIR) & UART_IIR_NO_INT)) goto next; info->last_active = jiffies; status = serial_inp(info, UART_LSR); #ifdef SERIAL_DEBUG_INTR printk("status = %x...", status); #endif if (status & UART_LSR_DR) receive_chars(info, &status, regs); check_modem_status(info); if (status & UART_LSR_THRE) transmit_chars(info, 0); next: info = info->next_port; if (info) continue; info = IRQ_ports[irq]; if (pass_counter++ > RS_ISR_PASS_LIMIT) { #if 1 printk("rs_multi loop break\n"); #endif break; /* Prevent infinite loops */ } if (multi->port_monitor) printk("rs port monitor irq %d: 0x%x, 0x%x\n", info->state->irq, first_multi, inb(multi->port_monitor)); if ((inb(multi->port1) & multi->mask1) != multi->match1) continue; if (!multi->port2) break; if ((inb(multi->port2) & multi->mask2) != multi->match2) continue; if (!multi->port3) break; if ((inb(multi->port3) & multi->mask3) != multi->match3) continue; if (!multi->port4) break; if ((inb(multi->port4) & multi->mask4) != multi->match4) continue; break; } #ifdef SERIAL_DEBUG_INTR printk("end.\n"); #endif } #endif /* * ------------------------------------------------------------------- * Here ends the serial interrupt routines. * ------------------------------------------------------------------- */ /* * This routine is used to handle the "bottom half" processing for the * serial driver, known also the "software interrupt" processing. * This processing is done at the kernel interrupt level, after the * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This * is where time-consuming activities which can not be done in the * interrupt driver proper are done; the interrupt driver schedules * them using rs_sched_event(), and they get done here. */ static void do_serial_bh(void) { run_task_queue(&tq_serial); } static void do_softint(void *private_) { struct async_struct *info = (struct async_struct *) private_; struct tty_struct *tty; tty = info->tty; if (!tty) return; if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) (tty->ldisc.write_wakeup)(tty); wake_up_interruptible(&tty->write_wait); wake_up_interruptible(&tty->poll_wait); } } /* * This subroutine is called when the RS_TIMER goes off. It is used * by the serial driver to handle ports that do not have an interrupt * (irq=0). This doesn't work very well for 16450's, but gives barely * passable results for a 16550A. (Although at the expense of much * CPU overhead). */ static void rs_timer(void) { static unsigned long last_strobe = 0; struct async_struct *info; unsigned int i; unsigned long flags; if ((jiffies - last_strobe) >= RS_STROBE_TIME) { for (i=1; i < NR_IRQS; i++) { info = IRQ_ports[i]; if (!info) continue; save_flags(flags); cli(); #ifdef CONFIG_SERIAL_SHARE_IRQ if (info->next_port) { do { serial_out(info, UART_IER, 0); info->IER |= UART_IER_THRI; serial_out(info, UART_IER, info->IER); info = info->next_port; } while (info); #ifdef CONFIG_SERIAL_MULTIPORT if (rs_multiport[i].port1) rs_interrupt_multi(i, NULL, NULL); else #endif rs_interrupt(i, NULL, NULL); } else #endif /* CONFIG_SERIAL_SHARE_IRQ */ rs_interrupt_single(i, NULL, NULL); restore_flags(flags); } } last_strobe = jiffies; timer_table[RS_TIMER].expires = jiffies + RS_STROBE_TIME; timer_active |= 1 << RS_TIMER; if (IRQ_ports[0]) { save_flags(flags); cli(); #ifdef CONFIG_SERIAL_SHARE_IRQ rs_interrupt(0, NULL, NULL); #else rs_interrupt_single(0, NULL, NULL); #endif restore_flags(flags); timer_table[RS_TIMER].expires = jiffies + IRQ_timeout[0] - 2; } } /* * --------------------------------------------------------------- * Low level utility subroutines for the serial driver: routines to * figure out the appropriate timeout for an interrupt chain, routines * to initialize and startup a serial port, and routines to shutdown a * serial port. Useful stuff like that. * --------------------------------------------------------------- */ /* * This routine figures out the correct timeout for a particular IRQ. * It uses the smallest timeout of all of the serial ports in a * particular interrupt chain. Now only used for IRQ 0.... */ static void figure_IRQ_timeout(int irq) { struct async_struct *info; int timeout = 60*HZ; /* 60 seconds === a long time :-) */ info = IRQ_ports[irq]; if (!info) { IRQ_timeout[irq] = 60*HZ; return; } while (info) { if (info->timeout < timeout) timeout = info->timeout; info = info->next_port; } if (!irq) timeout = timeout / 2; IRQ_timeout[irq] = timeout ? timeout : 1; } static int startup(struct async_struct * info) { unsigned long flags; int retval=0; void (*handler)(int, void *, struct pt_regs *); struct serial_state *state= info->state; unsigned long page; #ifdef CONFIG_SERIAL_MANY_PORTS unsigned short ICP; #endif page = get_free_page(GFP_KERNEL); if (!page) return -ENOMEM; save_flags(flags); cli(); if (info->flags & ASYNC_INITIALIZED) { free_page(page); goto errout; } if (!state->port || !state->type) { if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); free_page(page); goto errout; } if (info->xmit_buf) free_page(page); else info->xmit_buf = (unsigned char *) page; #ifdef SERIAL_DEBUG_OPEN printk("starting up ttys%d (irq %d)...", info->line, state->irq); #endif if (uart_config[info->state->type].flags & UART_STARTECH) { /* Wake up UART */ serial_outp(info, UART_LCR, 0xBF); serial_outp(info, UART_EFR, UART_EFR_ECB); serial_outp(info, UART_IER, 0); serial_outp(info, UART_EFR, 0); serial_outp(info, UART_LCR, 0); } if (info->state->type == PORT_16750) { /* Wake up UART */ serial_outp(info, UART_IER, 0); } /* * Clear the FIFO buffers and disable them * (they will be reenabled in change_speed()) */ if (uart_config[state->type].flags & UART_CLEAR_FIFO) serial_outp(info, UART_FCR, (UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT)); /* * At this point there's no way the LSR could still be 0xFF; * if it is, then bail out, because there's likely no UART * here. */ if (serial_inp(info, UART_LSR) == 0xff) { if (capable(CAP_SYS_ADMIN)) { if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); } else retval = -ENODEV; goto errout; } /* * Allocate the IRQ if necessary */ if (state->irq && (!IRQ_ports[state->irq] || !IRQ_ports[state->irq]->next_port)) { if (IRQ_ports[state->irq]) { #ifdef CONFIG_SERIAL_SHARE_IRQ free_irq(state->irq, NULL); #ifdef CONFIG_SERIAL_MULTIPORT if (rs_multiport[state->irq].port1) handler = rs_interrupt_multi; else #endif handler = rs_interrupt; #else retval = -EBUSY; goto errout; #endif /* CONFIG_SERIAL_SHARE_IRQ */ } else handler = rs_interrupt_single; retval = request_irq(state->irq, handler, IRQ_T(state), "serial", NULL); if (retval) { if (capable(CAP_SYS_ADMIN)) { if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); retval = 0; } goto errout; } } /* * Insert serial port into IRQ chain. */ info->prev_port = 0; info->next_port = IRQ_ports[state->irq]; if (info->next_port) info->next_port->prev_port = info; IRQ_ports[state->irq] = info; figure_IRQ_timeout(state->irq); /* * Clear the interrupt registers. */ /* (void) serial_inp(info, UART_LSR); */ /* (see above) */ (void) serial_inp(info, UART_RX); (void) serial_inp(info, UART_IIR); (void) serial_inp(info, UART_MSR); /* * Now, initialize the UART */ serial_outp(info, UART_LCR, UART_LCR_WLEN8); /* reset DLAB */ info->MCR = 0; if (info->tty->termios->c_cflag & CBAUD) info->MCR = UART_MCR_DTR | UART_MCR_RTS; #ifdef CONFIG_SERIAL_MANY_PORTS if (info->flags & ASYNC_FOURPORT) { if (state->irq == 0) info->MCR |= UART_MCR_OUT1; } else #endif { if (state->irq != 0) info->MCR |= UART_MCR_OUT2; } #if defined(__alpha__) && !defined(CONFIG_PCI) /* * DEC did something gratutiously wrong.... */ info->MCR |= UART_MCR_OUT1 | UART_MCR_OUT2; #endif serial_outp(info, UART_MCR, info->MCR); /* * Finally, enable interrupts */ info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; serial_outp(info, UART_IER, info->IER); /* enable interrupts */ #ifdef CONFIG_SERIAL_MANY_PORTS if (info->flags & ASYNC_FOURPORT) { /* Enable interrupts on the AST Fourport board */ ICP = (info->port & 0xFE0) | 0x01F; outb_p(0x80, ICP); (void) inb_p(ICP); } #endif /* * And clear the interrupt registers again for luck. */ (void)serial_inp(info, UART_LSR); (void)serial_inp(info, UART_RX); (void)serial_inp(info, UART_IIR); (void)serial_inp(info, UART_MSR); if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags); info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; /* * Set up serial timers... */ timer_table[RS_TIMER].expires = jiffies + 2*HZ/100; timer_active |= 1 << RS_TIMER; /* * Set up the tty->alt_speed kludge */ if (info->tty) { if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) info->tty->alt_speed = 57600; if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) info->tty->alt_speed = 115200; if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) info->tty->alt_speed = 230400; if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) info->tty->alt_speed = 460800; } /* * and set the speed of the serial port */ change_speed(info, 0); info->flags |= ASYNC_INITIALIZED; restore_flags(flags); return 0; errout: restore_flags(flags); return retval; } /* * This routine will shutdown a serial port; interrupts are disabled, and * DTR is dropped if the hangup on close termio flag is on. */ static void shutdown(struct async_struct * info) { unsigned long flags; struct serial_state *state; int retval; if (!(info->flags & ASYNC_INITIALIZED)) return; state = info->state; #ifdef SERIAL_DEBUG_OPEN printk("Shutting down serial port %d (irq %d)....", info->line, state->irq); #endif save_flags(flags); cli(); /* Disable interrupts */ /* * clear delta_msr_wait queue to avoid mem leaks: we may free the irq * here so the queue might never be waken up */ wake_up_interruptible(&info->delta_msr_wait); /* * First unlink the serial port from the IRQ chain... */ if (info->next_port) info->next_port->prev_port = info->prev_port; if (info->prev_port) info->prev_port->next_port = info->next_port; else IRQ_ports[state->irq] = info->next_port; figure_IRQ_timeout(state->irq); /* * Free the IRQ, if necessary */ if (state->irq && (!IRQ_ports[state->irq] || !IRQ_ports[state->irq]->next_port)) { if (IRQ_ports[state->irq]) { free_irq(state->irq, NULL); retval = request_irq(state->irq, rs_interrupt_single, IRQ_T(state), "serial", NULL); if (retval) printk("serial shutdown: request_irq: error %d" " Couldn't reacquire IRQ.\n", retval); } else free_irq(state->irq, NULL); } if (info->xmit_buf) { free_page((unsigned long) info->xmit_buf); info->xmit_buf = 0; } info->IER = 0; serial_outp(info, UART_IER, 0x00); /* disable all intrs */ #ifdef CONFIG_SERIAL_MANY_PORTS if (info->flags & ASYNC_FOURPORT) { /* reset interrupts on the AST Fourport board */ (void) inb((info->port & 0xFE0) | 0x01F); info->MCR |= UART_MCR_OUT1; } else #endif info->MCR &= ~UART_MCR_OUT2; #if defined(__alpha__) && !defined(CONFIG_PCI) /* * DEC did something gratutiously wrong.... */ info->MCR |= UART_MCR_OUT1 | UART_MCR_OUT2; #endif /* disable break condition */ serial_out(info, UART_LCR, serial_inp(info, UART_LCR) & ~UART_LCR_SBC); if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS); serial_outp(info, UART_MCR, info->MCR); /* disable FIFO's */ serial_outp(info, UART_FCR, (UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT)); (void)serial_in(info, UART_RX); /* read data port to reset things */ if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags); if (uart_config[info->state->type].flags & UART_STARTECH) { /* Arrange to enter sleep mode */ serial_outp(info, UART_LCR, 0xBF); serial_outp(info, UART_EFR, UART_EFR_ECB); serial_outp(info, UART_IER, UART_IERX_SLEEP); serial_outp(info, UART_LCR, 0); } if (info->state->type == PORT_16750) { /* Arrange to enter sleep mode */ serial_outp(info, UART_IER, UART_IERX_SLEEP); } info->flags &= ~ASYNC_INITIALIZED; restore_flags(flags); } /* * This routine is called to set the UART divisor registers to match * the specified baud rate for a serial port. */ static void change_speed(struct async_struct *info, struct termios *old_termios) { unsigned short port; int quot = 0, baud_base, baud; unsigned cflag, cval, fcr = 0; int bits; unsigned long flags; if (!info->tty || !info->tty->termios) return; cflag = info->tty->termios->c_cflag; if (!(port = info->port)) return; /* byte size and parity */ switch (cflag & CSIZE) { case CS5: cval = 0x00; bits = 7; break; case CS6: cval = 0x01; bits = 8; break; case CS7: cval = 0x02; bits = 9; break; case CS8: cval = 0x03; bits = 10; break; /* Never happens, but GCC is too dumb to figure it out */ default: cval = 0x00; bits = 7; break; } if (cflag & CSTOPB) { cval |= 0x04; bits++; } if (cflag & PARENB) { cval |= UART_LCR_PARITY; bits++; } if (!(cflag & PARODD)) cval |= UART_LCR_EPAR; #ifdef CMSPAR if (cflag & CMSPAR) cval |= UART_LCR_SPAR; #endif /* Determine divisor based on baud rate */ baud = tty_get_baud_rate(info->tty); if (!baud) baud = 9600; /* B0 transition handled in rs_set_termios */ baud_base = info->state->baud_base; if (baud == 38400 && ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) quot = info->state->custom_divisor; else { if (baud == 134) /* Special case since 134 is really 134.5 */ quot = (2*baud_base / 269); else if (baud) quot = baud_base / baud; } /* If the quotient is zero refuse the change */ if (!quot && old_termios) { info->tty->termios->c_cflag &= ~CBAUD; info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD); baud = tty_get_baud_rate(info->tty); if (!baud) baud = 9600; if (baud == 38400 && ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) quot = info->state->custom_divisor; else { if (baud == 134) /* Special case since 134 is really 134.5 */ quot = (2*baud_base / 269); else if (baud) quot = baud_base / baud; } } /* As a last resort, if the quotient is zero, default to 9600 bps */ if (!quot) quot = baud_base / 9600; info->quot = quot; info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); info->timeout += HZ/50; /* Add .02 seconds of slop */ /* Set up FIFO's */ if (uart_config[info->state->type].flags & UART_USE_FIFO) { if ((info->state->baud_base / quot) < 2400) fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1; else fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8; } if (info->state->type == PORT_16750) fcr |= UART_FCR7_64BYTE; /* CTS flow control flag and modem status interrupts */ info->IER &= ~UART_IER_MSI; if (info->flags & ASYNC_HARDPPS_CD) info->IER |= UART_IER_MSI; if (cflag & CRTSCTS) { info->flags |= ASYNC_CTS_FLOW; info->IER |= UART_IER_MSI; } else info->flags &= ~ASYNC_CTS_FLOW; if (cflag & CLOCAL) info->flags &= ~ASYNC_CHECK_CD; else { info->flags |= ASYNC_CHECK_CD; info->IER |= UART_IER_MSI; } serial_out(info, UART_IER, info->IER); /* * Set up parity check flag */ #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; if (I_INPCK(info->tty)) info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; if (I_BRKINT(info->tty) || I_PARMRK(info->tty)) info->read_status_mask |= UART_LSR_BI; #if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) if (info->line == sercons.index) info->read_status_mask |= UART_LSR_BI; #endif /* * Characters to ignore */ info->ignore_status_mask = 0; if (I_IGNPAR(info->tty)) info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; if (I_IGNBRK(info->tty)) { info->ignore_status_mask |= UART_LSR_BI; /* * If we're ignore parity and break indicators, ignore * overruns too. (For real raw support). */ if (I_IGNPAR(info->tty)) info->ignore_status_mask |= UART_LSR_OE; } /* * !!! ignore all characters if CREAD is not set */ if ((cflag & CREAD) == 0) info->ignore_status_mask |= UART_LSR_DR; save_flags(flags); cli(); if (uart_config[info->state->type].flags & UART_STARTECH) { serial_outp(info, UART_LCR, 0xBF); serial_outp(info, UART_EFR, (cflag & CRTSCTS) ? UART_EFR_CTS : 0); } serial_outp(info, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */ serial_outp(info, UART_DLL, quot & 0xff); /* LS of divisor */ serial_outp(info, UART_DLM, quot >> 8); /* MS of divisor */ if (info->state->type == PORT_16750) serial_outp(info, UART_FCR, fcr); /* set fcr */ serial_outp(info, UART_LCR, cval); /* reset DLAB */ if (info->state->type != PORT_16750) { if (fcr & UART_FCR_ENABLE_FIFO) { /* emulated UARTs (Lucent Venus 167x) need two steps */ serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO); } serial_outp(info, UART_FCR, fcr); /* set fcr */ } restore_flags(flags); } static void rs_put_char(struct tty_struct *tty, unsigned char ch) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_put_char")) return; if (!tty || !info->xmit_buf) return; save_flags(flags); cli(); if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1) { restore_flags(flags); return; } info->xmit_buf[info->xmit_head++] = ch; info->xmit_head &= SERIAL_XMIT_SIZE-1; info->xmit_cnt++; restore_flags(flags); } static void rs_flush_chars(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_flush_chars")) return; if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || !info->xmit_buf) return; save_flags(flags); cli(); info->IER |= UART_IER_THRI; serial_out(info, UART_IER, info->IER); restore_flags(flags); } static int rs_write(struct tty_struct * tty, int from_user, const unsigned char *buf, int count) { int c, ret = 0; struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_write")) return 0; if (!tty || !info->xmit_buf || !tmp_buf) return 0; save_flags(flags); if (from_user) { down(&tmp_buf_sem); while (1) { c = MIN(count, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, SERIAL_XMIT_SIZE - info->xmit_head)); if (c <= 0) break; c -= copy_from_user(tmp_buf, buf, c); if (!c) { if (!ret) ret = -EFAULT; break; } cli(); c = MIN(c, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, SERIAL_XMIT_SIZE - info->xmit_head)); memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c); info->xmit_head = ((info->xmit_head + c) & (SERIAL_XMIT_SIZE-1)); info->xmit_cnt += c; restore_flags(flags); buf += c; count -= c; ret += c; } up(&tmp_buf_sem); } else { while (1) { cli(); c = MIN(count, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, SERIAL_XMIT_SIZE - info->xmit_head)); if (c <= 0) { restore_flags(flags); break; } memcpy(info->xmit_buf + info->xmit_head, buf, c); info->xmit_head = ((info->xmit_head + c) & (SERIAL_XMIT_SIZE-1)); info->xmit_cnt += c; restore_flags(flags); buf += c; count -= c; ret += c; } } if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped && !(info->IER & UART_IER_THRI)) { info->IER |= UART_IER_THRI; serial_out(info, UART_IER, info->IER); } return ret; } static int rs_write_room(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; int ret; if (serial_paranoia_check(info, tty->device, "rs_write_room")) return 0; ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; if (ret < 0) ret = 0; return ret; } static int rs_chars_in_buffer(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer")) return 0; return info->xmit_cnt; } static void rs_flush_buffer(struct tty_struct *tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_flush_buffer")) return; save_flags(flags); cli(); info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; restore_flags(flags); wake_up_interruptible(&tty->write_wait); wake_up_interruptible(&tty->poll_wait); if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) (tty->ldisc.write_wakeup)(tty); } /* * This function is used to send a high-priority XON/XOFF character to * the device */ static void rs_send_xchar(struct tty_struct *tty, char ch) { struct async_struct *info = (struct async_struct *)tty->driver_data; if (serial_paranoia_check(info, tty->device, "rs_send_char")) return; info->x_char = ch; if (ch) { /* Make sure transmit interrupts are on */ info->IER |= UART_IER_THRI; serial_out(info, UART_IER, info->IER); } } /* * ------------------------------------------------------------ * rs_throttle() * * This routine is called by the upper-layer tty layer to signal that * incoming characters should be throttled. * ------------------------------------------------------------ */ static void rs_throttle(struct tty_struct * tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; #ifdef SERIAL_DEBUG_THROTTLE char buf[64]; printk("throttle %s: %d....\n", tty_name(tty, buf), tty->ldisc.chars_in_buffer(tty)); #endif if (serial_paranoia_check(info, tty->device, "rs_throttle")) return; if (I_IXOFF(tty)) rs_send_xchar(tty, STOP_CHAR(tty)); if (tty->termios->c_cflag & CRTSCTS) info->MCR &= ~UART_MCR_RTS; save_flags(flags); cli(); serial_out(info, UART_MCR, info->MCR); restore_flags(flags); } static void rs_unthrottle(struct tty_struct * tty) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; #ifdef SERIAL_DEBUG_THROTTLE char buf[64]; printk("unthrottle %s: %d....\n", tty_name(tty, buf), tty->ldisc.chars_in_buffer(tty)); #endif if (serial_paranoia_check(info, tty->device, "rs_unthrottle")) return; if (I_IXOFF(tty)) { if (info->x_char) info->x_char = 0; else rs_send_xchar(tty, START_CHAR(tty)); } if (tty->termios->c_cflag & CRTSCTS) info->MCR |= UART_MCR_RTS; save_flags(flags); cli(); serial_out(info, UART_MCR, info->MCR); restore_flags(flags); } /* * ------------------------------------------------------------ * rs_ioctl() and friends * ------------------------------------------------------------ */ static int get_serial_info(struct async_struct * info, struct serial_struct * retinfo) { struct serial_struct tmp; struct serial_state *state = info->state; if (!retinfo) return -EFAULT; memset(&tmp, 0, sizeof(tmp)); tmp.type = state->type; tmp.line = state->line; tmp.port = state->port; tmp.irq = state->irq; tmp.flags = state->flags; tmp.xmit_fifo_size = state->xmit_fifo_size; tmp.baud_base = state->baud_base; tmp.close_delay = state->close_delay; tmp.closing_wait = state->closing_wait; tmp.custom_divisor = state->custom_divisor; tmp.hub6 = state->hub6; if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) return -EFAULT; return 0; } static int set_serial_info(struct async_struct * info, struct serial_struct * new_info) { struct serial_struct new_serial; struct serial_state old_state, *state; unsigned int i,change_irq,change_port; int retval = 0; if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) return -EFAULT; state = info->state; old_state = *state; change_irq = new_serial.irq != state->irq; change_port = (new_serial.port != state->port) || (new_serial.hub6 != state->hub6); if (!capable(CAP_SYS_ADMIN)) { if (change_irq || change_port || (new_serial.baud_base != state->baud_base) || (new_serial.type != state->type) || (new_serial.close_delay != state->close_delay) || (new_serial.xmit_fifo_size != state->xmit_fifo_size) || ((new_serial.flags & ~ASYNC_USR_MASK) != (state->flags & ~ASYNC_USR_MASK))) return -EPERM; state->flags = ((state->flags & ~ASYNC_USR_MASK) | (new_serial.flags & ASYNC_USR_MASK)); info->flags = ((info->flags & ~ASYNC_USR_MASK) | (new_serial.flags & ASYNC_USR_MASK)); state->custom_divisor = new_serial.custom_divisor; goto check_and_exit; } new_serial.irq = irq_cannonicalize(new_serial.irq); if ((new_serial.irq >= NR_IRQS) || (new_serial.port > 0xffff) || (new_serial.baud_base < 9600)|| (new_serial.type < PORT_UNKNOWN) || (new_serial.type > PORT_MAX) || (new_serial.type == PORT_CIRRUS) || (new_serial.type == PORT_STARTECH)) { return -EINVAL; } if ((new_serial.type != state->type) || (new_serial.xmit_fifo_size <= 0)) new_serial.xmit_fifo_size = uart_config[new_serial.type].dfl_xmit_fifo_size; /* Make sure address is not already in use */ if (new_serial.type) { for (i = 0 ; i < NR_PORTS; i++) if ((state != &rs_table[i]) && (rs_table[i].port == new_serial.port) && rs_table[i].type) return -EADDRINUSE; } if ((change_port || change_irq) && (state->count > 1)) return -EBUSY; /* * OK, past this point, all the error checking has been done. * At this point, we start making changes..... */ state->baud_base = new_serial.baud_base; state->flags = ((state->flags & ~ASYNC_FLAGS) | (new_serial.flags & ASYNC_FLAGS)); info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) | (info->flags & ASYNC_INTERNAL_FLAGS)); state->custom_divisor = new_serial.custom_divisor; state->type = new_serial.type; state->close_delay = new_serial.close_delay * HZ/100; state->closing_wait = new_serial.closing_wait * HZ/100; info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; info->xmit_fifo_size = state->xmit_fifo_size = new_serial.xmit_fifo_size; release_region(state->port,8); if (change_port || change_irq) { /* * We need to shutdown the serial port at the old * port/irq combination. */ shutdown(info); state->irq = new_serial.irq; info->port = state->port = new_serial.port; info->hub6 = state->hub6 = new_serial.hub6; } if (state->type != PORT_UNKNOWN) request_region(state->port,8,"serial(set)"); check_and_exit: if (!state->port || !state->type) return 0; if (info->flags & ASYNC_INITIALIZED) { if (((old_state.flags & ASYNC_SPD_MASK) != (state->flags & ASYNC_SPD_MASK)) || (old_state.custom_divisor != state->custom_divisor)) { if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) info->tty->alt_speed = 57600; if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) info->tty->alt_speed = 115200; if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) info->tty->alt_speed = 230400; if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) info->tty->alt_speed = 460800; change_speed(info, 0); } } else retval = startup(info); return retval; } /* * get_lsr_info - get line status register info * * Purpose: Let user call ioctl() to get info when the UART physically * is emptied. On bus types like RS485, the transmitter must * release the bus after transmitting. This must be done when * the transmit shift register is empty, not be done when the * transmit holding register is empty. This functionality * allows an RS485 driver to be written in user space. */ static int get_lsr_info(struct async_struct * info, unsigned int *value) { unsigned char status; unsigned int result; unsigned long flags; save_flags(flags); cli(); status = serial_in(info, UART_LSR); restore_flags(flags); result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0); return put_user(result,value); } static int get_modem_info(struct async_struct * info, unsigned int *value) { unsigned char control, status; unsigned int result; unsigned long flags; control = info->MCR; save_flags(flags); cli(); status = serial_in(info, UART_MSR); restore_flags(flags); result = ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) #ifdef TIOCM_OUT1 | ((control & UART_MCR_OUT1) ? TIOCM_OUT1 : 0) | ((control & UART_MCR_OUT2) ? TIOCM_OUT2 : 0) #endif | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) | ((status & UART_MSR_RI) ? TIOCM_RNG : 0) | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0); return put_user(result,value); } static int set_modem_info(struct async_struct * info, unsigned int cmd, unsigned int *value) { int error; unsigned int arg; unsigned long flags; error = get_user(arg, value); if (error) return error; switch (cmd) { case TIOCMBIS: if (arg & TIOCM_RTS) info->MCR |= UART_MCR_RTS; if (arg & TIOCM_DTR) info->MCR |= UART_MCR_DTR; #ifdef TIOCM_OUT1 if (arg & TIOCM_OUT1) info->MCR |= UART_MCR_OUT1; if (arg & TIOCM_OUT2) info->MCR |= UART_MCR_OUT2; #endif break; case TIOCMBIC: if (arg & TIOCM_RTS) info->MCR &= ~UART_MCR_RTS; if (arg & TIOCM_DTR) info->MCR &= ~UART_MCR_DTR; #ifdef TIOCM_OUT1 if (arg & TIOCM_OUT1) info->MCR &= ~UART_MCR_OUT1; if (arg & TIOCM_OUT2) info->MCR &= ~UART_MCR_OUT2; #endif break; case TIOCMSET: info->MCR = ((info->MCR & ~(UART_MCR_RTS | #ifdef TIOCM_OUT1 UART_MCR_OUT1 | UART_MCR_OUT2 | #endif UART_MCR_DTR)) | ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0) #ifdef TIOCM_OUT1 | ((arg & TIOCM_OUT1) ? UART_MCR_OUT1 : 0) | ((arg & TIOCM_OUT2) ? UART_MCR_OUT2 : 0) #endif | ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0)); break; default: return -EINVAL; } save_flags(flags); cli(); serial_out(info, UART_MCR, info->MCR); restore_flags(flags); return 0; } static int do_autoconfig(struct async_struct * info) { int retval; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (info->state->count > 1) return -EBUSY; shutdown(info); autoconfig(info->state); if ((info->state->flags & ASYNC_AUTO_IRQ) && (info->state->port != 0) && (info->state->type != PORT_UNKNOWN)) info->state->irq = detect_uart_irq(info->state); retval = startup(info); if (retval) return retval; return 0; } /* * rs_break() --- routine which turns the break handling on or off */ static void rs_break(struct tty_struct *tty, int break_state) { struct async_struct * info = (struct async_struct *)tty->driver_data; unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_break")) return; if (!info->port) return; save_flags(flags); cli(); if (break_state == -1) serial_out(info, UART_LCR, serial_inp(info, UART_LCR) | UART_LCR_SBC); else serial_out(info, UART_LCR, serial_inp(info, UART_LCR) & ~UART_LCR_SBC); restore_flags(flags); } #ifdef CONFIG_SERIAL_MULTIPORT static int get_multiport_struct(struct async_struct * info, struct serial_multiport_struct *retinfo) { struct serial_multiport_struct ret; struct rs_multiport_struct *multi; multi = &rs_multiport[info->state->irq]; ret.port_monitor = multi->port_monitor; ret.port1 = multi->port1; ret.mask1 = multi->mask1; ret.match1 = multi->match1; ret.port2 = multi->port2; ret.mask2 = multi->mask2; ret.match2 = multi->match2; ret.port3 = multi->port3; ret.mask3 = multi->mask3; ret.match3 = multi->match3; ret.port4 = multi->port4; ret.mask4 = multi->mask4; ret.match4 = multi->match4; ret.irq = info->state->irq; if (copy_to_user(retinfo,&ret,sizeof(*retinfo))) return -EFAULT; return 0; } static int set_multiport_struct(struct async_struct * info, struct serial_multiport_struct *in_multi) { struct serial_multiport_struct new_multi; struct rs_multiport_struct *multi; struct serial_state *state; int was_multi, now_multi; int retval; void (*handler)(int, void *, struct pt_regs *); if (!capable(CAP_SYS_ADMIN)) return -EPERM; state = info->state; if (copy_from_user(&new_multi, in_multi, sizeof(struct serial_multiport_struct))) return -EFAULT; if (new_multi.irq != state->irq || state->irq == 0 || !IRQ_ports[state->irq]) return -EINVAL; multi = &rs_multiport[state->irq]; was_multi = (multi->port1 != 0); multi->port_monitor = new_multi.port_monitor; if (multi->port1) release_region(multi->port1,1); multi->port1 = new_multi.port1; multi->mask1 = new_multi.mask1; multi->match1 = new_multi.match1; if (multi->port1) request_region(multi->port1,1,"serial(multiport1)"); if (multi->port2) release_region(multi->port2,1); multi->port2 = new_multi.port2; multi->mask2 = new_multi.mask2; multi->match2 = new_multi.match2; if (multi->port2) request_region(multi->port2,1,"serial(multiport2)"); if (multi->port3) release_region(multi->port3,1); multi->port3 = new_multi.port3; multi->mask3 = new_multi.mask3; multi->match3 = new_multi.match3; if (multi->port3) request_region(multi->port3,1,"serial(multiport3)"); if (multi->port4) release_region(multi->port4,1); multi->port4 = new_multi.port4; multi->mask4 = new_multi.mask4; multi->match4 = new_multi.match4; if (multi->port4) request_region(multi->port4,1,"serial(multiport4)"); now_multi = (multi->port1 != 0); if (IRQ_ports[state->irq]->next_port && (was_multi != now_multi)) { free_irq(state->irq, NULL); if (now_multi) handler = rs_interrupt_multi; else handler = rs_interrupt; retval = request_irq(state->irq, handler, IRQ_T(state), "serial", NULL); if (retval) { printk("Couldn't reallocate serial interrupt " "driver!!\n"); } } return 0; } #endif static int rs_ioctl(struct tty_struct *tty, struct file * file, unsigned int cmd, unsigned long arg) { int error; struct async_struct * info = (struct async_struct *)tty->driver_data; struct async_icount cprev, cnow; /* kernel counter temps */ struct serial_icounter_struct *p_cuser; /* user space */ unsigned long flags; if (serial_paranoia_check(info, tty->device, "rs_ioctl")) return -ENODEV; if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { if (tty->flags & (1 << TTY_IO_ERROR)) return -EIO; } switch (cmd) { case TIOCMGET: return get_modem_info(info, (unsigned int *) arg); case TIOCMBIS: case TIOCMBIC: case TIOCMSET: return set_modem_info(info, cmd, (unsigned int *) arg); case TIOCGSERIAL: return get_serial_info(info, (struct serial_struct *) arg); case TIOCSSERIAL: return set_serial_info(info, (struct serial_struct *) arg); case TIOCSERCONFIG: return do_autoconfig(info); case TIOCSERGETLSR: /* Get line status register */ return get_lsr_info(info, (unsigned int *) arg); case TIOCSERGSTRUCT: if (copy_to_user((struct async_struct *) arg, info, sizeof(struct async_struct))) return -EFAULT; return 0; #ifdef CONFIG_SERIAL_MULTIPORT case TIOCSERGETMULTI: return get_multiport_struct(info, (struct serial_multiport_struct *) arg); case TIOCSERSETMULTI: return set_multiport_struct(info, (struct serial_multiport_struct *) arg); #endif /* * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change * - mask passed in arg for lines of interest * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) * Caller should use TIOCGICOUNT to see which one it was */ case TIOCMIWAIT: save_flags(flags); cli(); /* note the counters on entry */ cprev = info->state->icount; restore_flags(flags); while (1) { interruptible_sleep_on(&info->delta_msr_wait); /* see if a signal did it */ if (signal_pending(current)) return -ERESTARTSYS; save_flags(flags); cli(); cnow = info->state->icount; /* atomic copy */ restore_flags(flags); if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) return -EIO; /* no change => error */ if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { return 0; } cprev = cnow; } /* NOTREACHED */ /* * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) * Return: write counters to the user passed counter struct * NB: both 1->0 and 0->1 transitions are counted except for * RI where only 0->1 is counted. */ case TIOCGICOUNT: save_flags(flags); cli(); cnow = info->state->icount; restore_flags(flags); p_cuser = (struct serial_icounter_struct *) arg; error = put_user(cnow.cts, &p_cuser->cts); if (error) return error; error = put_user(cnow.dsr, &p_cuser->dsr); if (error) return error; error = put_user(cnow.rng, &p_cuser->rng); if (error) return error; error = put_user(cnow.dcd, &p_cuser->dcd); if (error) return error; error = put_user(cnow.rx, &p_cuser->rx); if (error) return error; error = put_user(cnow.tx, &p_cuser->tx); if (error) return error; error = put_user(cnow.frame, &p_cuser->frame); if (error) return error; error = put_user(cnow.overrun, &p_cuser->overrun); if (error) return error; error = put_user(cnow.parity, &p_cuser->parity); if (error) return error; error = put_user(cnow.brk, &p_cuser->brk); if (error) return error; error = put_user(cnow.buf_overrun, &p_cuser->buf_overrun); if (error) return error; return 0; case TIOCSERGWILD: case TIOCSERSWILD: /* "setserial -W" is called in Debian boot */ printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); return 0; default: return -ENOIOCTLCMD; } return 0; } static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) { struct async_struct *info = (struct async_struct *)tty->driver_data; unsigned long flags; unsigned int cflag = tty->termios->c_cflag; if ( (cflag == old_termios->c_cflag) && ( RELEVANT_IFLAG(tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) return; change_speed(info, old_termios); /* Handle transition to B0 status */ if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) { info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS); save_flags(flags); cli(); serial_out(info, UART_MCR, info->MCR); restore_flags(flags); } /* Handle transition away from B0 status */ if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { info->MCR |= UART_MCR_DTR; if (!(tty->termios->c_cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) { info->MCR |= UART_MCR_RTS; } save_flags(flags); cli(); serial_out(info, UART_MCR, info->MCR); restore_flags(flags); } /* Handle turning off CRTSCTS */ if ((old_termios->c_cflag & CRTSCTS) && !(tty->termios->c_cflag & CRTSCTS)) { tty->hw_stopped = 0; rs_start(tty); } #if 0 /* * No need to wake up processes in open wait, since they * sample the CLOCAL flag once, and don't recheck it. * XXX It's not clear whether the current behavior is correct * or not. Hence, this may change..... */ if (!(old_termios->c_cflag & CLOCAL) && (tty->termios->c_cflag & CLOCAL)) wake_up_interruptible(&info->open_wait); #endif } /* * ------------------------------------------------------------ * rs_close() * * This routine is called when the serial port gets closed. First, we * wait for the last remaining data to be sent. Then, we unlink its * async structure from the interrupt chain if necessary, and we free * that IRQ if nothing is left in the chain. * ------------------------------------------------------------ */ static void rs_close(struct tty_struct *tty, struct file * filp) { struct async_struct * info = (struct async_struct *)tty->driver_data; struct serial_state *state; unsigned long flags; if (!info || serial_paranoia_check(info, tty->device, "rs_close")) return; state = info->state; save_flags(flags); cli(); if (tty_hung_up_p(filp)) { DBG_CNT("before DEC-hung"); MOD_DEC_USE_COUNT; restore_flags(flags); return; } #ifdef SERIAL_DEBUG_OPEN printk("rs_close ttys%d, count = %d\n", info->line, state->count); #endif if ((tty->count == 1) && (state->count != 1)) { /* * Uh, oh. tty->count is 1, which means that the tty * structure will be freed. state->count should always * be one in these conditions. If it's greater than * one, we've got real problems, since it means the * serial port won't be shutdown. */ printk("rs_close: bad serial port count; tty->count is 1, " "state->count is %d\n", state->count); state->count = 1; } if (--state->count < 0) { printk("rs_close: bad serial port count for ttys%d: %d\n", info->line, state->count); state->count = 0; } if (state->count) { DBG_CNT("before DEC-2"); MOD_DEC_USE_COUNT; restore_flags(flags); return; } info->flags |= ASYNC_CLOSING; /* * Save the termios structure, since this port may have * separate termios for callout and dialin. */ if (info->flags & ASYNC_NORMAL_ACTIVE) info->state->normal_termios = *tty->termios; if (info->flags & ASYNC_CALLOUT_ACTIVE) info->state->callout_termios = *tty->termios; /* * Now we wait for the transmit buffer to clear; and we notify * the line discipline to only process XON/XOFF characters. */ tty->closing = 1; if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) tty_wait_until_sent(tty, info->closing_wait); /* * At this point we stop accepting input. To do this, we * disable the receive line status interrupts, and tell the * interrupt driver to stop checking the data ready bit in the * line status register. */ info->IER &= ~UART_IER_RLSI; info->read_status_mask &= ~UART_LSR_DR; if (info->flags & ASYNC_INITIALIZED) { serial_out(info, UART_IER, info->IER); /* * Before we drop DTR, make sure the UART transmitter * has completely drained; this is especially * important if there is a transmit FIFO! */ rs_wait_until_sent(tty, info->timeout); } shutdown(info); if (tty->driver.flush_buffer) tty->driver.flush_buffer(tty); if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty); tty->closing = 0; info->event = 0; info->tty = 0; if (info->blocked_open) { if (info->close_delay) { current->state = TASK_INTERRUPTIBLE; schedule_timeout(info->close_delay); } wake_up_interruptible(&info->open_wait); } info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE| ASYNC_CLOSING); wake_up_interruptible(&info->close_wait); MOD_DEC_USE_COUNT; restore_flags(flags); } /* * rs_wait_until_sent() --- wait until the transmitter is empty */ static void rs_wait_until_sent(struct tty_struct *tty, int timeout) { struct async_struct * info = (struct async_struct *)tty->driver_data; unsigned long orig_jiffies, char_time; int lsr; if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent")) return; if (info->state->type == PORT_UNKNOWN) return; if (info->xmit_fifo_size == 0) return; /* Just in case.... */ orig_jiffies = jiffies; /* * Set the check interval to be 1/5 of the estimated time to * send a single character, and make it at least 1. The check * interval should also be less than the timeout. * * Note: we have to use pretty tight timings here to satisfy * the NIST-PCTS. */ char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; char_time = char_time / 5; if (char_time == 0) char_time = 1; if (timeout) char_time = MIN(char_time, timeout); /* * If the transmitter hasn't cleared in twice the approximate * amount of time to send the entire FIFO, it probably won't * ever clear. This assumes the UART isn't doing flow * control, which is currently the case. Hence, if it ever * takes longer than info->timeout, this is probably due to a * UART bug of some kind. So, we clamp the timeout parameter at * 2*info->timeout. */ if (!timeout || timeout > 2*info->timeout) timeout = 2*info->timeout; #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); printk("jiff=%lu...", jiffies); #endif while (!((lsr = serial_inp(info, UART_LSR)) & UART_LSR_TEMT)) { #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("lsr = %d (jiff=%lu)...", lsr, jiffies); #endif current->state = TASK_INTERRUPTIBLE; current->counter = 0; /* make us low-priority */ schedule_timeout(char_time); if (signal_pending(current)) break; if (timeout && time_after(jiffies, orig_jiffies + timeout)) break; } current->state = TASK_RUNNING; #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); #endif } /* * rs_hangup() --- called by tty_hangup() when a hangup is signaled. */ static void rs_hangup(struct tty_struct *tty) { struct async_struct * info = (struct async_struct *)tty->driver_data; struct serial_state *state = info->state; if (serial_paranoia_check(info, tty->device, "rs_hangup")) return; state = info->state; rs_flush_buffer(tty); shutdown(info); info->event = 0; state->count = 0; info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE); info->tty = 0; wake_up_interruptible(&info->open_wait); } /* * ------------------------------------------------------------ * rs_open() and friends * ------------------------------------------------------------ */ static int block_til_ready(struct tty_struct *tty, struct file * filp, struct async_struct *info) { struct wait_queue wait = { current, NULL }; struct serial_state *state = info->state; int retval; int do_clocal = 0, extra_count = 0; unsigned long flags; /* * If the device is in the middle of being closed, then block * until it's done, and then try again. */ if (tty_hung_up_p(filp) || (info->flags & ASYNC_CLOSING)) { if (info->flags & ASYNC_CLOSING) interruptible_sleep_on(&info->close_wait); #ifdef SERIAL_DO_RESTART return ((info->flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS); #else return -EAGAIN; #endif } /* * If this is a callout device, then just make sure the normal * device isn't being used. */ if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) { if (info->flags & ASYNC_NORMAL_ACTIVE) return -EBUSY; if ((info->flags & ASYNC_CALLOUT_ACTIVE) && (info->flags & ASYNC_SESSION_LOCKOUT) && (info->session != current->session)) return -EBUSY; if ((info->flags & ASYNC_CALLOUT_ACTIVE) && (info->flags & ASYNC_PGRP_LOCKOUT) && (info->pgrp != current->pgrp)) return -EBUSY; info->flags |= ASYNC_CALLOUT_ACTIVE; return 0; } /* * If non-blocking mode is set, or the port is not enabled, * then make the check up front and then exit. */ if ((filp->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) { if (info->flags & ASYNC_CALLOUT_ACTIVE) return -EBUSY; info->flags |= ASYNC_NORMAL_ACTIVE; return 0; } if (info->flags & ASYNC_CALLOUT_ACTIVE) { if (state->normal_termios.c_cflag & CLOCAL) do_clocal = 1; } else { if (tty->termios->c_cflag & CLOCAL) do_clocal = 1; } /* * Block waiting for the carrier detect and the line to become * free (i.e., not in use by the callout). While we are in * this loop, state->count is dropped by one, so that * rs_close() knows when to free things. We restore it upon * exit, either normal or abnormal. */ retval = 0; add_wait_queue(&info->open_wait, &wait); #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready before block: ttys%d, count = %d\n", state->line, state->count); #endif save_flags(flags); cli(); if (!tty_hung_up_p(filp)) { extra_count = 1; state->count--; } restore_flags(flags); info->blocked_open++; while (1) { save_flags(flags); cli(); if (!(info->flags & ASYNC_CALLOUT_ACTIVE) && (tty->termios->c_cflag & CBAUD)) serial_out(info, UART_MCR, serial_inp(info, UART_MCR) | (UART_MCR_DTR | UART_MCR_RTS)); restore_flags(flags); current->state = TASK_INTERRUPTIBLE; if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)) { #ifdef SERIAL_DO_RESTART if (info->flags & ASYNC_HUP_NOTIFY) retval = -EAGAIN; else retval = -ERESTARTSYS; #else retval = -EAGAIN; #endif break; } if (!(info->flags & ASYNC_CALLOUT_ACTIVE) && !(info->flags & ASYNC_CLOSING) && (do_clocal || (serial_in(info, UART_MSR) & UART_MSR_DCD))) break; if (signal_pending(current)) { retval = -ERESTARTSYS; break; } #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready blocking: ttys%d, count = %d\n", info->line, state->count); #endif schedule(); } current->state = TASK_RUNNING; remove_wait_queue(&info->open_wait, &wait); if (extra_count) state->count++; info->blocked_open--; #ifdef SERIAL_DEBUG_OPEN printk("block_til_ready after blocking: ttys%d, count = %d\n", info->line, state->count); #endif if (retval) return retval; info->flags |= ASYNC_NORMAL_ACTIVE; return 0; } static int get_async_struct(int line, struct async_struct **ret_info) { struct async_struct *info; struct serial_state *sstate; sstate = rs_table + line; sstate->count++; if (sstate->info) { *ret_info = sstate->info; return 0; } info = kmalloc(sizeof(struct async_struct), GFP_KERNEL); if (!info) { sstate->count--; return -ENOMEM; } memset(info, 0, sizeof(struct async_struct)); info->magic = SERIAL_MAGIC; info->port = sstate->port; info->flags = sstate->flags; info->xmit_fifo_size = sstate->xmit_fifo_size; info->line = line; info->tqueue.routine = do_softint; info->tqueue.data = info; info->state = sstate; if (sstate->info) { kfree_s(info, sizeof(struct async_struct)); *ret_info = sstate->info; return 0; } *ret_info = sstate->info = info; return 0; } /* * This routine is called whenever a serial port is opened. It * enables interrupts for a serial port, linking in its async structure into * the IRQ chain. It also performs the serial-specific * initialization for the tty structure. */ static int rs_open(struct tty_struct *tty, struct file * filp) { struct async_struct *info; int retval, line; unsigned long page; MOD_INC_USE_COUNT; line = MINOR(tty->device) - tty->driver.minor_start; if ((line < 0) || (line >= NR_PORTS)) { MOD_DEC_USE_COUNT; return -ENODEV; } retval = get_async_struct(line, &info); if (retval) { MOD_DEC_USE_COUNT; return retval; } tty->driver_data = info; info->tty = tty; if (serial_paranoia_check(info, tty->device, "rs_open")) { /* MOD_DEC_USE_COUNT; "info->tty" will cause this */ return -ENODEV; } #ifdef SERIAL_DEBUG_OPEN printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line, info->state->count); #endif info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0; if (!tmp_buf) { page = get_free_page(GFP_KERNEL); if (!page) { /* MOD_DEC_USE_COUNT; "info->tty" will cause this? */ return -ENOMEM; } if (tmp_buf) free_page(page); else tmp_buf = (unsigned char *) page; } /* * If the port is the middle of closing, bail out now */ if (tty_hung_up_p(filp) || (info->flags & ASYNC_CLOSING)) { if (info->flags & ASYNC_CLOSING) interruptible_sleep_on(&info->close_wait); /* MOD_DEC_USE_COUNT; "info->tty" will cause this? */ #ifdef SERIAL_DO_RESTART return ((info->flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS); #else return -EAGAIN; #endif } /* * Start up serial port */ retval = startup(info); if (retval) { /* MOD_DEC_USE_COUNT; "info->tty" will cause this? */ return retval; } retval = block_til_ready(tty, filp, info); if (retval) { /* MOD_DEC_USE_COUNT; "info->tty" will cause this? */ #ifdef SERIAL_DEBUG_OPEN printk("rs_open returning after block_til_ready with %d\n", retval); #endif return retval; } if ((info->state->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) { if (tty->driver.subtype == SERIAL_TYPE_NORMAL) *tty->termios = info->state->normal_termios; else *tty->termios = info->state->callout_termios; change_speed(info, 0); } #ifdef CONFIG_SERIAL_CONSOLE if (sercons.cflag && sercons.index == line) { tty->termios->c_cflag = sercons.cflag; sercons.cflag = 0; change_speed(info, 0); } #endif info->session = current->session; info->pgrp = current->pgrp; #ifdef SERIAL_DEBUG_OPEN printk("rs_open ttys%d successful...", info->line); #endif return 0; } /* * /proc fs routines.... */ static inline int line_info(char *buf, struct serial_state *state) { struct async_struct *info = state->info, scr_info; char stat_buf[30], control, status; int ret; unsigned long flags; ret = sprintf(buf, "%d: uart:%s port:%X irq:%d", state->line, uart_config[state->type].name, state->port, state->irq); if (!state->port || (state->type == PORT_UNKNOWN)) { ret += sprintf(buf+ret, "\n"); return ret; } /* * Figure out the current RS-232 lines */ if (!info) { info = &scr_info; /* This is just for serial_{in,out} */ info->magic = SERIAL_MAGIC; info->port = state->port; info->flags = state->flags; info->quot = 0; info->tty = 0; } save_flags(flags); cli(); status = serial_in(info, UART_MSR); control = info ? info->MCR : serial_in(info, UART_MCR); restore_flags(flags); stat_buf[0] = 0; stat_buf[1] = 0; if (control & UART_MCR_RTS) strcat(stat_buf, "|RTS"); if (status & UART_MSR_CTS) strcat(stat_buf, "|CTS"); if (control & UART_MCR_DTR) strcat(stat_buf, "|DTR"); if (status & UART_MSR_DSR) strcat(stat_buf, "|DSR"); if (status & UART_MSR_DCD) strcat(stat_buf, "|CD"); if (status & UART_MSR_RI) strcat(stat_buf, "|RI"); if (info->quot) { ret += sprintf(buf+ret, " baud:%d", state->baud_base / info->quot); } ret += sprintf(buf+ret, " tx:%d rx:%d", state->icount.tx, state->icount.rx); if (state->icount.frame) ret += sprintf(buf+ret, " fe:%d", state->icount.frame); if (state->icount.parity) ret += sprintf(buf+ret, " pe:%d", state->icount.parity); if (state->icount.brk) ret += sprintf(buf+ret, " brk:%d", state->icount.brk); if (state->icount.overrun) ret += sprintf(buf+ret, " oe:%d", state->icount.overrun); /* * Last thing is the RS-232 status lines */ ret += sprintf(buf+ret, " %s\n", stat_buf+1); return ret; } int rs_read_proc(char *page, char **start, off_t idx, ssize_t count, int *eof, void *data) { int n; *start = (char *) 1L; if (!idx) { n = sprintf(page, "serinfo:1.0 driver:%s\n", serial_version); goto out; } idx--; n = 0; if (idx >= NR_PORTS || idx < 0) goto out; n = line_info(page, &rs_table[idx]); if (idx + 1 == NR_PORTS) *eof = 1; out: if (n > count) n = 0; return n; } /* * --------------------------------------------------------------------- * rs_init() and friends * * rs_init() is called at boot-time to initialize the serial driver. * --------------------------------------------------------------------- */ /* * This routine prints out the appropriate serial driver version * number, and identifies which options were configured into this * driver. */ static _INLINE_ void show_serial_version(void) { printk(KERN_INFO "%s version %s with", serial_name, serial_version); #ifdef CONFIG_DCIPCCOM_PCI printk(" DCI_PCCOM_PCI"); #define SERIAL_OPT #endif /* CONFIG_DCIPCCOM_PCI */ #ifdef CONFIG_HUB6 printk(" HUB-6"); #define SERIAL_OPT #endif #ifdef CONFIG_SERIAL_MANY_PORTS printk(" MANY_PORTS"); #define SERIAL_OPT #endif #ifdef CONFIG_SERIAL_MULTIPORT printk(" MULTIPORT"); #define SERIAL_OPT #endif #ifdef CONFIG_SERIAL_SHARE_IRQ printk(" SHARE_IRQ"); #define SERIAL_OPT #endif #ifdef CONFIG_SERIAL_DETECT_IRQ printk(" DETECT_IRQ"); #define SERIAL_OPT #endif #ifdef SERIAL_OPT printk(" enabled\n"); #else printk(" no serial options enabled\n"); #endif #undef SERIAL_OPT } #ifdef CONFIG_DCIPCCOM_PCI /* * dci_pci_detect() - Test PCI bus presence and Decision PCCOM PCI. */ static void dci_pci_detect(void) { #define DCIPCCOM_PCI_PI_MAX 4 static unsigned char dcipccom_pci_pi[DCIPCCOM_PCI_PI_MAX] = { PCI_PI_SERIAL_XT, PCI_PI_SERIAL_16450, PCI_PI_SERIAL_16550, PCI_PI_SERIAL_16650 }; struct pci_dev *pdev = NULL; int reg, vect; unsigned int class = PCI_CLASS_COMMUNICATION_SERIAL; unsigned short vendor; unsigned int base; unsigned char pi, irq, nport, pcid; unsigned int i, index, card; int rc; struct serial_state *info; if (pci_present() == 0) /* PCI bus not present */ return; for (index = card = 0; card < serial_dcpci_nr_cards; index++) { /* * find sio communication class */ for (i = 0; i < DCIPCCOM_PCI_PI_MAX; i++) { struct pci_dev *ppdev; ppdev = pdev; pi = dcipccom_pci_pi[i]; if ((pdev = pci_find_class((class << 8) | pi, pdev)) != NULL) break; else pdev = ppdev; } if (i == DCIPCCOM_PCI_PI_MAX) break; /* * find decision card */ if ((rc = pci_read_config_word(pdev, PCI_VENDOR_ID, &vendor)) != PCIBIOS_SUCCESSFUL) break; if (vendor != PCI_DECISION) continue; /* * determine programming interface */ if ((rc = pci_read_config_byte(pdev, PCI_CLASS_PROG, &pi)) != PCIBIOS_SUCCESSFUL) break; switch (pi) { case PCI_PI_SERIAL_XT: case PCI_PI_SERIAL_16450: case PCI_PI_SERIAL_16550: case PCI_PI_SERIAL_16650: break; default: continue; } /* * NPORT */ if ((rc = pci_read_config_byte(pdev, PCI_DC_SIO_PORT, &nport)) != PCIBIOS_SUCCESSFUL) break; switch (nport) { case PCI_DC_SIO_2P: nport = 2; break; case PCI_DC_SIO_4P: nport = 4; break; case PCI_DC_SIO_8P: nport = 8; break; case PCI_DC_SIO_16P: nport = 16; break; default: nport = 0; break; } #if 0 printk("nport = %d\n", nport); #endif /* * IRQ */ if ((rc = pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &irq)) != PCIBIOS_SUCCESSFUL) break; #if 0 printk("IRQ %d\n", irq); #endif /* * I/O Base addr */ i = 0; for (reg = PCI_BASE_ADDRESS_2; reg <= PCI_BASE_ADDRESS_5; i++, reg += 4) { if ((rc = pci_read_config_dword(pdev, reg, &base)) != PCIBIOS_SUCCESSFUL) return; if (!base) continue; #if 0 printk("I/O %d at 0x%x\n", i, base); #endif if (base & PCI_BASE_ADDRESS_SPACE) { base &= PCI_BASE_ADDRESS_IO_MASK; #if 0 printk("I/O %d at 0x%x\n", i, base); #endif break; } } switch (nport) { case 2: vect = PCCOM_PCI_VECT_2P(base); pcid = inb(PCCOM_PCI_SWID_2P(base)) >> 4; break; case 4: vect = PCCOM_PCI_VECT_4P(base); pcid = inb(PCCOM_PCI_SWID_4P(base)) >> 4; break; case 8: vect = PCCOM_PCI_VECT_8P(base); pcid = inb(PCCOM_PCI_SWID_8P(base)) >> 4; break; default: vect = 0; pcid = 0; break; } #if 0 printk("dci_pci_detect(%d): (nport, base, irq) = (%d, %x, %d)\n", card, (unsigned)nport, base, (unsigned)irq); #endif info = rs_table + serial_dcpci_minor[card]; for (i = 0; i < nport; info++, i++) { info->port = base + (i << 3); info->irq = irq; #if 0 printk("%d --> [%d]\n", i, irq); #endif } #if 0 cards[set].nport = nport; cards[set].irq = irq; cards[set].addr = base; cards[set].vect = vect; cards[set].pcid = pcid; #endif card++; } } /* dci_pci_detect() */ #endif /* CONFIG_DCIPCCOM_PCI */ /* * This routine detect the IRQ of a serial port by clearing OUT2 when * no UART interrupt are requested (IER = 0) (*GPL*). This seems to work at * each time, as long as no other device permanently request the IRQ. * If no IRQ is detected, or multiple IRQ appear, this function returns 0. * The variable "state" and the field "state->port" should not be null. */ static unsigned detect_uart_irq (struct serial_state * state) { int irq; unsigned long irqs; unsigned char save_mcr, save_ier; struct async_struct scr_info; /* serial_{in,out} because HUB6 */ #ifdef CONFIG_SERIAL_MANY_PORTS unsigned char save_ICP=0; /* no warning */ unsigned short ICP=0; if (state->flags & ASYNC_FOURPORT) { ICP = (state->port & 0xFE0) | 0x01F; save_ICP = inb_p(ICP); outb_p(0x80, ICP); (void) inb_p(ICP); } #endif scr_info.magic = SERIAL_MAGIC; scr_info.port = state->port; scr_info.flags = state->flags; #ifdef CONFIG_HUB6 scr_info.hub6 = state->hub6; #endif /* forget possible initially masked and pending IRQ */ probe_irq_off(probe_irq_on()); save_mcr = serial_inp(&scr_info, UART_MCR); save_ier = serial_inp(&scr_info, UART_IER); serial_outp(&scr_info, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2); irqs = probe_irq_on(); serial_outp(&scr_info, UART_MCR, 0); udelay (10); if (state->flags & ASYNC_FOURPORT) { serial_outp(&scr_info, UART_MCR, UART_MCR_DTR | UART_MCR_RTS); } else { serial_outp(&scr_info, UART_MCR, UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2); } serial_outp(&scr_info, UART_IER, 0x0f); /* enable all intrs */ (void)serial_inp(&scr_info, UART_LSR); (void)serial_inp(&scr_info, UART_RX); (void)serial_inp(&scr_info, UART_IIR); (void)serial_inp(&scr_info, UART_MSR); serial_outp(&scr_info, UART_TX, 0xFF); udelay (20); irq = probe_irq_off(irqs); serial_outp(&scr_info, UART_MCR, save_mcr); serial_outp(&scr_info, UART_IER, save_ier); #ifdef CONFIG_SERIAL_MANY_PORTS if (state->flags & ASYNC_FOURPORT) outb_p(save_ICP, ICP); #endif return (irq > 0)? irq : 0; } /* * This routine is called by rs_init() to initialize a specific serial * port. It determines what type of UART chip this serial port is * using: 8250, 16450, 16550, 16550A. The important question is * whether or not this UART is a 16550A, since this will determine * whether or not we can use its FIFO features. */ static void autoconfig(struct serial_state * state) { unsigned char status1, status2, scratch, scratch2; struct async_struct *info, scr_info; unsigned long flags; state->type = PORT_UNKNOWN; if (!state->port) return; info = &scr_info; /* This is just for serial_{in,out} */ info->magic = SERIAL_MAGIC; info->port = state->port; info->flags = state->flags; #ifdef CONFIG_HUB6 info->hub6 = state->hub6; #endif save_flags(flags); cli(); /* * Do a simple existence test first; if we fail this, there's * no point trying anything else. * * 0x80 is used as a nonsense port to prevent against false * positives due to ISA bus float. The assumption is that * 0x80 is a non-existent port; which should be safe since * include/asm/io.h also makes this assumption. */ scratch = serial_inp(info, UART_IER); serial_outp(info, UART_IER, 0); outb(0xff, 0x080); scratch2 = serial_inp(info, UART_IER); serial_outp(info, UART_IER, scratch); if (scratch2) { restore_flags(flags); return; /* We failed; there's nothing here */ } /* * Check to see if a UART is really there. Certain broken * internal modems based on the Rockwell chipset fail this * test, because they apparently don't implement the loopback * test mode. So this test is skipped on the COM 1 through * COM 4 ports. This *should* be safe, since no board * manufacturer would be stupid enough to design a board * that conflicts with COM 1-4 --- we hope! */ if (!(state->flags & ASYNC_SKIP_TEST)) { scratch = serial_inp(info, UART_MCR); serial_outp(info, UART_MCR, UART_MCR_LOOP | scratch); serial_outp(info, UART_MCR, UART_MCR_LOOP | 0x0A); status1 = serial_inp(info, UART_MSR) & 0xF0; serial_outp(info, UART_MCR, scratch); if (status1 != 0x90) { restore_flags(flags); return; } } scratch2 = serial_in(info, UART_LCR); serial_outp(info, UART_LCR, 0xBF); /* set up for StarTech test */ serial_outp(info, UART_EFR, 0); /* EFR is the same as FCR */ serial_outp(info, UART_LCR, 0); serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO); scratch = serial_in(info, UART_IIR) >> 6; switch (scratch) { case 0: state->type = PORT_16450; break; case 1: state->type = PORT_UNKNOWN; break; case 2: state->type = PORT_16550; break; case 3: state->type = PORT_16550A; break; } if (state->type == PORT_16550A) { /* Check for Startech UART's */ serial_outp(info, UART_LCR, scratch2 | UART_LCR_DLAB); if (serial_in(info, UART_EFR) == 0) { state->type = PORT_16650; } else { serial_outp(info, UART_LCR, 0xBF); if (serial_in(info, UART_EFR) == 0) state->type = PORT_16650V2; } } if (state->type == PORT_16550A) { /* Check for TI 16750 */ serial_outp(info, UART_LCR, scratch2 | UART_LCR_DLAB); serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); scratch = serial_in(info, UART_IIR) >> 5; if (scratch == 7) { serial_outp(info, UART_LCR, 0); scratch = serial_in(info, UART_IIR) >> 5; if (scratch == 6) state->type = PORT_16750; } serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO); } serial_outp(info, UART_LCR, scratch2); if (state->type == PORT_16450) { scratch = serial_in(info, UART_SCR); serial_outp(info, UART_SCR, 0xa5); status1 = serial_in(info, UART_SCR); serial_outp(info, UART_SCR, 0x5a); status2 = serial_in(info, UART_SCR); serial_outp(info, UART_SCR, scratch); if ((status1 != 0xa5) || (status2 != 0x5a)) state->type = PORT_8250; } state->xmit_fifo_size = uart_config[state->type].dfl_xmit_fifo_size; if (state->type == PORT_UNKNOWN) { restore_flags(flags); return; } request_region(info->port,8,"serial(auto)"); /* * Reset the UART. */ #if defined(__alpha__) && !defined(CONFIG_PCI) /* * I wonder what DEC did to the OUT1 and OUT2 lines? * clearing them results in endless interrupts. */ serial_outp(info, UART_MCR, 0x0c); #else serial_outp(info, UART_MCR, 0x00); #endif serial_outp(info, UART_FCR, (UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT)); (void)serial_in(info, UART_RX); serial_outp(info, UART_IER, 0); restore_flags(flags); } int register_serial(struct serial_struct *req); void unregister_serial(int line); EXPORT_SYMBOL(register_serial); EXPORT_SYMBOL(unregister_serial); /* * The serial driver boot-time initialization code! */ __initfunc(int rs_init(void)) { int i; struct serial_state * state; extern void atomwide_serial_init (void); extern void dualsp_serial_init (void); #ifdef CONFIG_ATOMWIDE_SERIAL atomwide_serial_init (); #endif #ifdef CONFIG_DUALSP_SERIAL dualsp_serial_init (); #endif init_bh(SERIAL_BH, do_serial_bh); timer_table[RS_TIMER].fn = rs_timer; timer_table[RS_TIMER].expires = 0; for (i = 0; i < NR_IRQS; i++) { IRQ_ports[i] = 0; IRQ_timeout[i] = 0; #ifdef CONFIG_SERIAL_MULTIPORT memset(&rs_multiport[i], 0, sizeof(struct rs_multiport_struct)); #endif } #ifdef CONFIG_SERIAL_CONSOLE /* * The interrupt of the serial console port * can't be shared. */ if (sercons.flags & CON_CONSDEV) { for(i = 0; i < NR_PORTS; i++) if (i != sercons.index && rs_table[i].irq == rs_table[sercons.index].irq) rs_table[i].irq = 0; } #endif show_serial_version(); /* Initialize the tty_driver structure */ memset(&serial_driver, 0, sizeof(struct tty_driver)); serial_driver.magic = TTY_DRIVER_MAGIC; serial_driver.driver_name = "serial"; serial_driver.name = "ttyS"; serial_driver.major = TTY_MAJOR; serial_driver.minor_start = 64; serial_driver.num = NR_PORTS; serial_driver.type = TTY_DRIVER_TYPE_SERIAL; serial_driver.subtype = SERIAL_TYPE_NORMAL; serial_driver.init_termios = tty_std_termios; serial_driver.init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; serial_driver.flags = TTY_DRIVER_REAL_RAW; serial_driver.refcount = &serial_refcount; serial_driver.table = serial_table; serial_driver.termios = serial_termios; serial_driver.termios_locked = serial_termios_locked; serial_driver.open = rs_open; serial_driver.close = rs_close; serial_driver.write = rs_write; serial_driver.put_char = rs_put_char; serial_driver.flush_chars = rs_flush_chars; serial_driver.write_room = rs_write_room; serial_driver.chars_in_buffer = rs_chars_in_buffer; serial_driver.flush_buffer = rs_flush_buffer; serial_driver.ioctl = rs_ioctl; serial_driver.throttle = rs_throttle; serial_driver.unthrottle = rs_unthrottle; serial_driver.send_xchar = rs_send_xchar; serial_driver.set_termios = rs_set_termios; serial_driver.stop = rs_stop; serial_driver.start = rs_start; serial_driver.hangup = rs_hangup; serial_driver.break_ctl = rs_break; serial_driver.wait_until_sent = rs_wait_until_sent; serial_driver.read_proc = rs_read_proc; /* * The callout device is just like normal device except for * major number and the subtype code. */ callout_driver = serial_driver; callout_driver.name = "cua"; callout_driver.major = TTYAUX_MAJOR; callout_driver.subtype = SERIAL_TYPE_CALLOUT; callout_driver.read_proc = 0; callout_driver.proc_entry = 0; if (tty_register_driver(&serial_driver)) panic("Couldn't register serial driver\n"); if (tty_register_driver(&callout_driver)) panic("Couldn't register callout driver\n"); #ifdef CONFIG_DCIPCCOM_PCI /* * detect Decision PCCOM PCI cards */ dci_pci_detect(); #endif /* CONFIG_DCIPCCOM_PCI */ for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) { state->magic = SSTATE_MAGIC; state->line = i; state->type = PORT_UNKNOWN; state->custom_divisor = 0; state->close_delay = 5*HZ/10; state->closing_wait = 30*HZ; state->callout_termios = callout_driver.init_termios; state->normal_termios = serial_driver.init_termios; state->icount.cts = state->icount.dsr = state->icount.rng = state->icount.dcd = 0; state->icount.rx = state->icount.tx = 0; state->icount.frame = state->icount.parity = 0; state->icount.overrun = state->icount.brk = 0; state->irq = irq_cannonicalize(state->irq); if (check_region(state->port,8)) continue; if (state->flags & ASYNC_BOOT_AUTOCONF) autoconfig(state); } /* * Detect the IRQ only once every port is initialised, * because some 16450 do not reset to 0 the MCR register. */ for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) { if (state->type == PORT_UNKNOWN) continue; if ( (state->flags & ASYNC_BOOT_AUTOCONF) && (state->flags & ASYNC_AUTO_IRQ) && (state->port != 0)) state->irq = detect_uart_irq(state); printk(KERN_INFO "ttyS%02d%s at 0x%04x (irq = %d) is a %s\n", state->line, (state->flags & ASYNC_FOURPORT) ? " FourPort" : "", state->port, state->irq, uart_config[state->type].name); } return 0; } /* * register_serial and unregister_serial allows for serial ports to be * configured at run-time, to support PCMCIA modems. */ int register_serial(struct serial_struct *req) { int i; unsigned long flags; struct serial_state *state; save_flags(flags); cli(); for (i = 0; i < NR_PORTS; i++) { if (rs_table[i].port == req->port) break; } if (i == NR_PORTS) { for (i = 0; i < NR_PORTS; i++) if ((rs_table[i].type == PORT_UNKNOWN) && (rs_table[i].count == 0)) break; } if (i == NR_PORTS) { restore_flags(flags); return -1; } state = &rs_table[i]; if (rs_table[i].count) { restore_flags(flags); printk("Couldn't configure serial #%d (port=%d,irq=%d): " "device already open\n", i, req->port, req->irq); return -1; } state->irq = req->irq; state->port = req->port; state->flags = req->flags; autoconfig(state); if (state->type == PORT_UNKNOWN) { restore_flags(flags); printk("register_serial(): autoconfig failed\n"); return -1; } restore_flags(flags); if ((state->flags & ASYNC_AUTO_IRQ) && (state->port != 0)) state->irq = detect_uart_irq(state); printk(KERN_INFO "tty%02d at 0x%04x (irq = %d) is a %s\n", state->line, state->port, state->irq, uart_config[state->type].name); return state->line; } void unregister_serial(int line) { unsigned long flags; struct serial_state *state = &rs_table[line]; save_flags(flags); cli(); if (state->info && state->info->tty) tty_hangup(state->info->tty); state->type = PORT_UNKNOWN; printk(KERN_INFO "tty%02d unloaded\n", state->line); restore_flags(flags); } #ifdef MODULE int init_module(void) { return rs_init(); } void cleanup_module(void) { unsigned long flags; int e1, e2; int i; struct async_struct *info; /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ save_flags(flags); cli(); timer_active &= ~(1 << RS_TIMER); timer_table[RS_TIMER].fn = NULL; timer_table[RS_TIMER].expires = 0; remove_bh(SERIAL_BH); if ((e1 = tty_unregister_driver(&serial_driver))) printk("SERIAL: failed to unregister serial driver (%d)\n", e1); if ((e2 = tty_unregister_driver(&callout_driver))) printk("SERIAL: failed to unregister callout driver (%d)\n", e2); restore_flags(flags); for (i = 0; i < NR_PORTS; i++) { if (rs_table[i].type != PORT_UNKNOWN) release_region(rs_table[i].port, 8); info = rs_table[i].info; if (info) { rs_table[i].info = NULL; kfree_s(info, sizeof(struct async_struct)); } } if (tmp_buf) { free_page((unsigned long) tmp_buf); tmp_buf = NULL; } } #endif /* MODULE */ /* * ------------------------------------------------------------ * Serial console driver * ------------------------------------------------------------ */ #ifdef CONFIG_SERIAL_CONSOLE #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) /* * Wait for transmitter & holding register to empty */ static inline void wait_for_xmitr(struct serial_state *ser) { int lsr; unsigned int tmout = 1000000; do { lsr = inb(ser->port + UART_LSR); if (--tmout == 0) break; } while ((lsr & BOTH_EMPTY) != BOTH_EMPTY); } /* * Print a string to the serial port trying not to disturb * any possible real use of the port... */ static void serial_console_write(struct console *co, const char *s, unsigned count) { struct serial_state *ser; int ier; unsigned i; ser = rs_table + co->index; /* * First save the IER then disable the interrupts */ ier = inb(ser->port + UART_IER); outb(0x00, ser->port + UART_IER); /* * Now, do each character */ for (i = 0; i < count; i++, s++) { wait_for_xmitr(ser); /* * Send the character out. * If a LF, also do CR... */ outb(*s, ser->port + UART_TX); if (*s == 10) { wait_for_xmitr(ser); outb(13, ser->port + UART_TX); } } /* * Finally, Wait for transmitter & holding register to empty * and restore the IER */ wait_for_xmitr(ser); outb(ier, ser->port + UART_IER); } /* * Receive character from the serial port */ static int serial_console_wait_key(struct console *co) { struct serial_state *ser; int ier; int lsr; int c; ser = rs_table + co->index; /* * First save the IER then disable the interrupts so * that the real driver for the port does not get the * character. */ ier = inb(ser->port + UART_IER); outb(0x00, ser->port + UART_IER); do { lsr = inb(ser->port + UART_LSR); } while (!(lsr & UART_LSR_DR)); c = inb(ser->port + UART_RX); /* * Restore the interrupts */ outb(ier, ser->port + UART_IER); return c; } static kdev_t serial_console_device(struct console *c) { return MKDEV(TTY_MAJOR, 64 + c->index); } /* * Setup initial baud/bits/parity. We do two things here: * - construct a cflag setting for the first rs_open() * - initialize the serial port * Return non-zero if we didn't find a serial port. */ __initfunc(static int serial_console_setup(struct console *co, char *options)) { struct serial_state *ser; unsigned cval; int baud = 9600; int bits = 8; int parity = 'n'; int cflag = CREAD | HUPCL | CLOCAL; int quot = 0; char *s; if (options) { baud = simple_strtoul(options, NULL, 10); s = options; while(*s >= '0' && *s <= '9') s++; if (*s) parity = *s++; if (*s) bits = *s - '0'; } /* * Now construct a cflag setting. */ switch(baud) { case 1200: cflag |= B1200; break; case 2400: cflag |= B2400; break; case 4800: cflag |= B4800; break; case 19200: cflag |= B19200; break; case 38400: cflag |= B38400; break; case 57600: cflag |= B57600; break; case 115200: cflag |= B115200; break; case 9600: default: cflag |= B9600; break; } switch(bits) { case 7: cflag |= CS7; break; default: case 8: cflag |= CS8; break; } switch(parity) { case 'o': case 'O': cflag |= PARODD; break; case 'e': case 'E': cflag |= PARENB; break; } co->cflag = cflag; /* * Divisor, bytesize and parity */ ser = rs_table + co->index; quot = ser->baud_base / baud; cval = cflag & (CSIZE | CSTOPB); #if defined(__powerpc__) || defined(__alpha__) cval >>= 8; #else /* !__powerpc__ && !__alpha__ */ cval >>= 4; #endif /* !__powerpc__ && !__alpha__ */ if (cflag & PARENB) cval |= UART_LCR_PARITY; if (!(cflag & PARODD)) cval |= UART_LCR_EPAR; /* * Disable UART interrupts, set DTR and RTS high * and set speed. */ outb(cval | UART_LCR_DLAB, ser->port + UART_LCR); /* set DLAB */ outb(quot & 0xff, ser->port + UART_DLL); /* LS of divisor */ outb(quot >> 8, ser->port + UART_DLM); /* MS of divisor */ outb(cval, ser->port + UART_LCR); /* reset DLAB */ outb(0, ser->port + UART_IER); outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR); /* * If we read 0xff from the LSR, there is no UART here. */ if (inb(ser->port + UART_LSR) == 0xff) return -1; return 0; } static struct console sercons = { "ttyS", serial_console_write, NULL, serial_console_device, serial_console_wait_key, NULL, serial_console_setup, CON_PRINTBUFFER, -1, 0, NULL }; /* * Register console. */ __initfunc (long serial_console_init(long kmem_start, long kmem_end)) { register_console(&sercons); return kmem_start; } #endif