/* * drivers/char/serial_tx3912.c * * Copyright (C) 1999 Harald Koerfgen * Copyright (C) 2000 Jim Pick * Copyright (C) 2001 Steven J. Hill (sjhill@realitydiluted.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Serial driver for TMPR3912/05 and PR31700 processors */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "serial_tx3912.h" /* * Forward declarations for serial routines */ static void rs_disable_tx_interrupts (void * ptr); static void rs_enable_tx_interrupts (void * ptr); static void rs_disable_rx_interrupts (void * ptr); static void rs_enable_rx_interrupts (void * ptr); static int rs_get_CD (void * ptr); static void rs_shutdown_port (void * ptr); static int rs_set_real_termios (void *ptr); static int rs_chars_in_buffer (void * ptr); static void rs_hungup (void *ptr); static void rs_close (void *ptr); /* * Used by generic serial driver to access hardware */ static struct real_driver rs_real_driver = { disable_tx_interrupts: rs_disable_tx_interrupts, enable_tx_interrupts: rs_enable_tx_interrupts, disable_rx_interrupts: rs_disable_rx_interrupts, enable_rx_interrupts: rs_enable_rx_interrupts, get_CD: rs_get_CD, shutdown_port: rs_shutdown_port, set_real_termios: rs_set_real_termios, chars_in_buffer: rs_chars_in_buffer, close: rs_close, hungup: rs_hungup, }; /* * Structures and such for TTY sessions and usage counts */ static struct tty_driver rs_driver, rs_callout_driver; static struct tty_struct * rs_table[TX3912_UART_NPORTS] = { NULL, }; static struct termios ** rs_termios; static struct termios ** rs_termios_locked; struct rs_port *rs_ports; int rs_refcount; int rs_initialized = 0; /* * FIXME: Redefines for IO macros in 'include/asm/io.h' */ //#define inb(addr) readb(addr) //#define inw(addr) readw(addr) //#define inl(addr) readl(addr) //#define outb(b, addr) writeb(b, addr) //#define outw(b, addr) writew(b, addr) //#define outl(b, addr) writel(b, addr) /* * ---------------------------------------------------------------------- * * 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 * ----------------------------------------------------------------------- */ static inline void receive_char_pio(struct rs_port *port) { struct tty_struct *tty = port->gs.tty; unsigned char ch; int counter = 2048; /* While there are characters, get them ... */ while (counter>0) { if (!(inl(port->base + TX3912_UART_CTRL1) & UART_RX_HOLD_FULL)) break; ch = inb(port->base + TX3912_UART_DATA); if (tty->flip.count < TTY_FLIPBUF_SIZE) { *tty->flip.char_buf_ptr++ = ch; *tty->flip.flag_buf_ptr++ = 0; tty->flip.count++; } udelay(1); /* Allow things to happen - it take a while */ counter--; } if (!counter) printk( "Ugh, looped in receive_char_pio!\n" ); tty_flip_buffer_push(tty); #if 0 /* Now handle error conditions */ if (*status & (INTTYPE(UART_RXOVERRUN_INT) | INTTYPE(UART_FRAMEERR_INT) | INTTYPE(UART_PARITYERR_INT) | INTTYPE(UART_BREAK_INT))) { /* * Now check to see if character should be * ignored, and mask off conditions which * should be ignored. */ if (*status & port->ignore_status_mask) { goto ignore_char; } *status &= port->read_status_mask; if (*status & INTTYPE(UART_BREAK_INT)) { rs_dprintk(TX3912_UART_DEBUG_INTERRUPTS, "handling break...."); *tty->flip.flag_buf_ptr = TTY_BREAK; } else if (*status & INTTYPE(UART_PARITYERR_INT)) { *tty->flip.flag_buf_ptr = TTY_PARITY; } else if (*status & INTTYPE(UART_FRAMEERR_INT)) { *tty->flip.flag_buf_ptr = TTY_FRAME; } if (*status & INTTYPE(UART_RXOVERRUN_INT)) { /* * 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; } } } tty->flip.flag_buf_ptr++; tty->flip.char_buf_ptr++; tty->flip.count++; ignore_char: tty_flip_buffer_push(tty); #endif } static inline void transmit_char_pio(struct rs_port *port) { /* While I'm able to transmit ... */ for (;;) { if (!(inl(port->base + TX3912_UART_CTRL1) & UART_TX_EMPTY)) break; else if (port->x_char) { outb(port->x_char, port->base + TX3912_UART_DATA); port->icount.tx++; port->x_char = 0; } else if (port->gs.xmit_cnt <= 0 || port->gs.tty->stopped || port->gs.tty->hw_stopped) { break; } else { outb(port->gs.xmit_buf[port->gs.xmit_tail++], port->base + TX3912_UART_DATA); port->icount.tx++; port->gs.xmit_tail &= SERIAL_XMIT_SIZE-1; if (--port->gs.xmit_cnt <= 0) { break; } } udelay(10); /* Allow things to happen - it take a while */ } if (port->gs.xmit_cnt <= 0 || port->gs.tty->stopped || port->gs.tty->hw_stopped) { rs_disable_tx_interrupts(port); } if (port->gs.xmit_cnt <= port->gs.wakeup_chars) { if ((port->gs.tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && port->gs.tty->ldisc.write_wakeup) (port->gs.tty->ldisc.write_wakeup)(port->gs.tty); rs_dprintk (TX3912_UART_DEBUG_TRANSMIT, "Waking up.... ldisc (%d)....\n", port->gs.wakeup_chars); wake_up_interruptible(&port->gs.tty->write_wait); } } static inline void check_modem_status(struct rs_port *port) { /* We don't have a carrier detect line - but just respond like we had one anyways so that open() becomes unblocked */ wake_up_interruptible(&port->gs.open_wait); } int count = 0; /* * This is the serial driver's interrupt routine (inlined, because * there are two different versions of this, one for each serial port, * differing only by the bits used in interrupt status 2 register) */ static inline void rs_rx_interrupt(int irq, void *dev_id, struct pt_regs * regs, int intshift) { struct rs_port * port; unsigned long int2status; unsigned long flags; unsigned long ints; save_and_cli(flags); port = (struct rs_port *)dev_id; rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "rs_interrupt (port %p, shift %d)...", port, intshift); /* Get the interrrupts we have enabled */ int2status = IntStatus2 & IntEnable2; /* Get interrupts in easy to use form */ ints = int2status >> intshift; /* Clear any interrupts we might be about to handle */ IntClear2 = int2status & ( (INTTYPE(UART_RXOVERRUN_INT) | INTTYPE(UART_FRAMEERR_INT) | INTTYPE(UART_BREAK_INT) | INTTYPE(UART_PARITYERR_INT) | INTTYPE(UART_RX_INT)) << intshift); if (!port || !port->gs.tty) { restore_flags(flags); return; } /* RX Receiver Holding Register Overrun */ if (ints & INTTYPE(UART_RXOVERRUN_INT)) { rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "overrun"); port->icount.overrun++; } /* RX Frame Error */ if (ints & INTTYPE(UART_FRAMEERR_INT)) { rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "frame error"); port->icount.frame++; } /* Break signal received */ if (ints & INTTYPE(UART_BREAK_INT)) { rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "break"); port->icount.brk++; } /* RX Parity Error */ if (ints & INTTYPE(UART_PARITYERR_INT)) { rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "parity error"); port->icount.parity++; } /* Receive byte (non-DMA) */ if (ints & INTTYPE(UART_RX_INT)) { receive_char_pio(port); } restore_flags(flags); rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "end.\n"); } static inline void rs_tx_interrupt(int irq, void *dev_id, struct pt_regs * regs, int intshift) { struct rs_port * port; unsigned long int2status; unsigned long flags; unsigned long ints; save_and_cli(flags); port = (struct rs_port *)dev_id; rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "rs_interrupt (port %p, shift %d)...", port, intshift); /* Get the interrrupts we have enabled */ int2status = IntStatus2 & IntEnable2; if (!port || !port->gs.tty) { restore_flags(flags); return; } /* Get interrupts in easy to use form */ ints = int2status >> intshift; /* Clear any interrupts we might be about to handle */ IntClear2 = int2status & ( (INTTYPE(UART_TX_INT) | INTTYPE(UART_EMPTY_INT) | INTTYPE(UART_TXOVERRUN_INT)) << intshift); /* TX holding register empty, so transmit byte (non-DMA) */ if (ints & (INTTYPE(UART_TX_INT) | INTTYPE(UART_EMPTY_INT))) { transmit_char_pio(port); } /* TX Transmit Holding Register Overrun (shouldn't happen) */ if (ints & INTTYPE(UART_TXOVERRUN_INT)) { printk ( "rs: TX overrun\n"); } /* check_modem_status(); */ restore_flags(flags); rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "end.\n"); } static void rs_rx_interrupt_uarta(int irq, void *dev_id, struct pt_regs * regs) { rs_rx_interrupt(irq, dev_id, regs, UARTA_SHIFT); } static void rs_tx_interrupt_uarta(int irq, void *dev_id, struct pt_regs * regs) { rs_tx_interrupt(irq, dev_id, regs, UARTA_SHIFT); } /* *********************************************************************** * Here are the routines that actually * * interface with the generic_serial driver * *********************************************************************** */ static void rs_disable_tx_interrupts (void * ptr) { struct rs_port *port = ptr; unsigned long flags; save_and_cli(flags); port->gs.flags &= ~GS_TX_INTEN; IntEnable2 &= ~((INTTYPE(UART_TX_INT) | INTTYPE(UART_EMPTY_INT) | INTTYPE(UART_TXOVERRUN_INT)) << port->intshift); IntClear2 = (INTTYPE(UART_TX_INT) | INTTYPE(UART_EMPTY_INT) | INTTYPE(UART_TXOVERRUN_INT)) << port->intshift; restore_flags(flags); } static void rs_enable_tx_interrupts (void * ptr) { struct rs_port *port = ptr; unsigned long flags; save_and_cli(flags); IntClear2 = (INTTYPE(UART_TX_INT) | INTTYPE(UART_EMPTY_INT) | INTTYPE(UART_TXOVERRUN_INT)) << port->intshift; IntEnable2 |= (INTTYPE(UART_TX_INT) | INTTYPE(UART_EMPTY_INT) | INTTYPE(UART_TXOVERRUN_INT)) << port->intshift; /* Send a char to start TX interrupts happening */ transmit_char_pio(port); restore_flags(flags); } static void rs_disable_rx_interrupts (void * ptr) { struct rs_port *port = ptr; unsigned long flags; save_and_cli(flags); IntEnable2 &= ~((INTTYPE(UART_RX_INT) | INTTYPE(UART_RXOVERRUN_INT) | INTTYPE(UART_FRAMEERR_INT) | INTTYPE(UART_BREAK_INT) | INTTYPE(UART_PARITYERR_INT)) << port->intshift); IntClear2 = (INTTYPE(UART_RX_INT) | INTTYPE(UART_RXOVERRUN_INT) | INTTYPE(UART_FRAMEERR_INT) | INTTYPE(UART_BREAK_INT) | INTTYPE(UART_PARITYERR_INT)) << port->intshift; restore_flags(flags); } static void rs_enable_rx_interrupts (void * ptr) { struct rs_port *port = ptr; unsigned long flags; save_and_cli(flags); IntEnable2 |= (INTTYPE(UART_RX_INT) | INTTYPE(UART_RXOVERRUN_INT) | INTTYPE(UART_FRAMEERR_INT) | INTTYPE(UART_BREAK_INT) | INTTYPE(UART_PARITYERR_INT)) << port->intshift; /* Empty the input buffer - apparently this is *vital* */ while (inl(port->base + TX3912_UART_CTRL1) & UART_RX_HOLD_FULL) { inb(port->base + TX3912_UART_DATA); } IntClear2 = (INTTYPE(UART_RX_INT) | INTTYPE(UART_RXOVERRUN_INT) | INTTYPE(UART_FRAMEERR_INT) | INTTYPE(UART_BREAK_INT) | INTTYPE(UART_PARITYERR_INT)) << port->intshift; restore_flags(flags); } static int rs_get_CD (void * ptr) { /* No Carried Detect in Hardware - just return true */ func_exit(); return (1); } static void rs_shutdown_port (void * ptr) { struct rs_port *port = ptr; func_enter(); port->gs.flags &= ~GS_ACTIVE; func_exit(); } static int rs_set_real_termios (void *ptr) { struct rs_port *port = ptr; int t; switch (port->gs.baud) { /* Save some typing work... */ #define e(x) case x:t= TX3912_UART_CTRL2_B ## x ; break e(300);e(600);e(1200);e(2400);e(4800);e(9600); e(19200);e(38400);e(57600);e(76800);e(115200);e(230400); case 0 :t = -1; break; default: /* Can I return "invalid"? */ t = TX3912_UART_CTRL2_B9600; printk (KERN_INFO "rs: unsupported baud rate: %d.\n", port->gs.baud); break; } #undef e if (t >= 0) { /* Jim: Set Hardware Baud rate - there is some good code in drivers/char/serial.c */ /* Program hardware for parity, data bits, stop bits (note: these are hardcoded to 8N1 */ UartA_Ctrl1 &= 0xf000000f; UartA_Ctrl1 &= ~(UART_DIS_TXD | SER_SEVEN_BIT | SER_EVEN_PARITY | SER_TWO_STOP); #define CFLAG port->gs.tty->termios->c_cflag if (C_PARENB(port->gs.tty)) { if (!C_PARODD(port->gs.tty)) UartA_Ctrl1 |= SER_EVEN_PARITY; else UartA_Ctrl1 |= SER_ODD_PARITY; } if ((CFLAG & CSIZE)==CS6) printk(KERN_ERR "6 bits not supported\n"); if ((CFLAG & CSIZE)==CS5) printk(KERN_ERR "5 bits not supported\n"); if ((CFLAG & CSIZE)==CS7) UartA_Ctrl1 |= SER_SEVEN_BIT; if (C_CSTOPB(port->gs.tty)) UartA_Ctrl1 |= SER_TWO_STOP; outl(t, port->base + TX3912_UART_CTRL2); outl(0, port->base + TX3912_UART_DMA_CTRL1); outl(0, port->base + TX3912_UART_DMA_CTRL2); UartA_Ctrl1 |= TX3912_UART_CTRL1_UARTON; /* wait until UARTA is stable */ while (~UartA_Ctrl1 & TX3912_UART_CTRL1_UARTON); } func_exit (); return 0; } static int rs_chars_in_buffer (void * ptr) { struct rs_port *port = ptr; int scratch; scratch = inl(port->base + TX3912_UART_CTRL1); return ((scratch & UART_TX_EMPTY) ? 0 : 1); } /* ********************************************************************** * * Here are the routines that actually * * interface with the rest of the system * * ********************************************************************** */ static int rs_open (struct tty_struct * tty, struct file * filp) { struct rs_port *port; int retval, line; func_enter(); if (!rs_initialized) { return -EIO; } line = MINOR(tty->device) - tty->driver.minor_start; rs_dprintk (TX3912_UART_DEBUG_OPEN, "%d: opening line %d. tty=%p ctty=%p)\n", (int) current->pid, line, tty, current->tty); if ((line < 0) || (line >= TX3912_UART_NPORTS)) return -ENODEV; /* Pre-initialized already */ port = & rs_ports[line]; rs_dprintk (TX3912_UART_DEBUG_OPEN, "port = %p\n", port); tty->driver_data = port; port->gs.tty = tty; port->gs.count++; rs_dprintk (TX3912_UART_DEBUG_OPEN, "starting port\n"); /* * Start up serial port */ retval = gs_init_port(&port->gs); rs_dprintk (TX3912_UART_DEBUG_OPEN, "done gs_init\n"); if (retval) { port->gs.count--; return retval; } port->gs.flags |= GS_ACTIVE; rs_dprintk (TX3912_UART_DEBUG_OPEN, "before inc_use_count (count=%d.\n", port->gs.count); if (port->gs.count == 1) { MOD_INC_USE_COUNT; } rs_dprintk (TX3912_UART_DEBUG_OPEN, "after inc_use_count\n"); /* Jim: Initialize port hardware here */ /* Enable high-priority interrupts for UARTA */ IntEnable6 |= INT6_UARTARXINT; rs_enable_rx_interrupts(&rs_ports[0]); retval = gs_block_til_ready(&port->gs, filp); rs_dprintk (TX3912_UART_DEBUG_OPEN, "Block til ready returned %d. Count=%d\n", retval, port->gs.count); if (retval) { MOD_DEC_USE_COUNT; port->gs.count--; return retval; } /* tty->low_latency = 1; */ if ((port->gs.count == 1) && (port->gs.flags & ASYNC_SPLIT_TERMIOS)) { if (tty->driver.subtype == SERIAL_TYPE_NORMAL) *tty->termios = port->gs.normal_termios; else *tty->termios = port->gs.callout_termios; rs_set_real_termios (port); } port->gs.session = current->session; port->gs.pgrp = current->pgrp; func_exit(); /* Jim */ /* cli(); */ return 0; } static void rs_close (void *ptr) { func_enter (); /* Anything to do here? */ MOD_DEC_USE_COUNT; func_exit (); } /* I haven't the foggiest why the decrement use count has to happen here. The whole linux serial drivers stuff needs to be redesigned. My guess is that this is a hack to minimize the impact of a bug elsewhere. Thinking about it some more. (try it sometime) Try running minicom on a serial port that is driven by a modularized driver. Have the modem hangup. Then remove the driver module. Then exit minicom. I expect an "oops". -- REW */ static void rs_hungup (void *ptr) { func_enter (); MOD_DEC_USE_COUNT; func_exit (); } static int rs_ioctl (struct tty_struct * tty, struct file * filp, unsigned int cmd, unsigned long arg) { int rc; struct rs_port *port = tty->driver_data; int ival; rc = 0; switch (cmd) { case TIOCGSOFTCAR: rc = put_user(((tty->termios->c_cflag & CLOCAL) ? 1 : 0), (unsigned int *) arg); break; case TIOCSSOFTCAR: if ((rc = verify_area(VERIFY_READ, (void *) arg, sizeof(int))) == 0) { get_user(ival, (unsigned int *) arg); tty->termios->c_cflag = (tty->termios->c_cflag & ~CLOCAL) | (ival ? CLOCAL : 0); } break; case TIOCGSERIAL: if ((rc = verify_area(VERIFY_WRITE, (void *) arg, sizeof(struct serial_struct))) == 0) gs_getserial(&port->gs, (struct serial_struct *) arg); break; case TIOCSSERIAL: if ((rc = verify_area(VERIFY_READ, (void *) arg, sizeof(struct serial_struct))) == 0) rc = gs_setserial(&port->gs, (struct serial_struct *) arg); break; default: rc = -ENOIOCTLCMD; break; } /* func_exit(); */ return rc; } /* * 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 rs_port *port = (struct rs_port *)tty->driver_data; func_enter (); port->x_char = ch; if (ch) { /* Make sure transmit interrupts are on */ rs_enable_tx_interrupts(tty); } func_exit(); } /* * ------------------------------------------------------------ * 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) { #ifdef TX3912_UART_DEBUG_THROTTLE char buf[64]; printk("throttle %s: %d....\n", tty_name(tty, buf), tty->ldisc.chars_in_buffer(tty)); #endif func_enter (); if (I_IXOFF(tty)) rs_send_xchar(tty, STOP_CHAR(tty)); func_exit (); } static void rs_unthrottle(struct tty_struct * tty) { struct rs_port *port = (struct rs_port *)tty->driver_data; #ifdef TX3912_UART_DEBUG_THROTTLE char buf[64]; printk("unthrottle %s: %d....\n", tty_name(tty, buf), tty->ldisc.chars_in_buffer(tty)); #endif func_enter(); if (I_IXOFF(tty)) { if (port->x_char) port->x_char = 0; else rs_send_xchar(tty, START_CHAR(tty)); } func_exit(); } /* ********************************************************************** * * Here are the initialization routines. * * ********************************************************************** */ void * ckmalloc (int size) { void *p; p = kmalloc(size, GFP_KERNEL); if (p) memset(p, 0, size); return p; } static int rs_init_portstructs(void) { struct rs_port *port; int i; /* Debugging */ func_enter(); rs_ports = ckmalloc(TX3912_UART_NPORTS * sizeof (struct rs_port)); if (!rs_ports) return -ENOMEM; rs_termios = ckmalloc(TX3912_UART_NPORTS * sizeof (struct termios *)); if (!rs_termios) { kfree (rs_ports); return -ENOMEM; } rs_termios_locked = ckmalloc(TX3912_UART_NPORTS * sizeof (struct termios *)); if (!rs_termios_locked) { kfree (rs_ports); kfree (rs_termios); return -ENOMEM; } /* Adjust the values in the "driver" */ rs_driver.termios = rs_termios; rs_driver.termios_locked = rs_termios_locked; port = rs_ports; for (i=0; i < TX3912_UART_NPORTS;i++) { rs_dprintk (TX3912_UART_DEBUG_INIT, "initing port %d\n", i); port->gs.callout_termios = tty_std_termios; port->gs.normal_termios = tty_std_termios; port->gs.magic = SERIAL_MAGIC; port->gs.close_delay = HZ/2; port->gs.closing_wait = 30 * HZ; port->gs.rd = &rs_real_driver; #ifdef NEW_WRITE_LOCKING port->gs.port_write_sem = MUTEX; #endif #ifdef DECLARE_WAITQUEUE init_waitqueue_head(&port->gs.open_wait); init_waitqueue_head(&port->gs.close_wait); #endif port->base = (i == 0) ? TX3912_UARTA_BASE : TX3912_UARTB_BASE; port->intshift = (i == 0) ? UARTA_SHIFT : UARTB_SHIFT; rs_dprintk (TX3912_UART_DEBUG_INIT, "base 0x%08lx intshift %d\n", port->base, port->intshift); port++; } func_exit(); return 0; } static int rs_init_drivers(void) { int error; func_enter(); memset(&rs_driver, 0, sizeof(rs_driver)); rs_driver.magic = TTY_DRIVER_MAGIC; rs_driver.driver_name = "serial"; rs_driver.name = "ttyS"; rs_driver.major = TTY_MAJOR; rs_driver.minor_start = 64; rs_driver.num = TX3912_UART_NPORTS; rs_driver.type = TTY_DRIVER_TYPE_SERIAL; rs_driver.subtype = SERIAL_TYPE_NORMAL; rs_driver.init_termios = tty_std_termios; rs_driver.init_termios.c_cflag = B115200 | CS8 | CREAD | HUPCL | CLOCAL; rs_driver.refcount = &rs_refcount; rs_driver.table = rs_table; rs_driver.termios = rs_termios; rs_driver.termios_locked = rs_termios_locked; rs_driver.open = rs_open; rs_driver.close = gs_close; rs_driver.write = gs_write; rs_driver.put_char = gs_put_char; rs_driver.flush_chars = gs_flush_chars; rs_driver.write_room = gs_write_room; rs_driver.chars_in_buffer = gs_chars_in_buffer; rs_driver.flush_buffer = gs_flush_buffer; rs_driver.ioctl = rs_ioctl; rs_driver.throttle = rs_throttle; rs_driver.unthrottle = rs_unthrottle; rs_driver.set_termios = gs_set_termios; rs_driver.stop = gs_stop; rs_driver.start = gs_start; rs_driver.hangup = gs_hangup; rs_callout_driver = rs_driver; rs_callout_driver.name = "cua"; rs_callout_driver.major = TTYAUX_MAJOR; rs_callout_driver.subtype = SERIAL_TYPE_CALLOUT; if ((error = tty_register_driver(&rs_driver))) { printk(KERN_ERR "Couldn't register serial driver, error = %d\n", error); return 1; } if ((error = tty_register_driver(&rs_callout_driver))) { tty_unregister_driver(&rs_driver); printk(KERN_ERR "Couldn't register callout driver, error = %d\n", error); return 1; } func_exit(); return 0; } void __init tx3912_rs_init(void) { int rc; func_enter(); rs_dprintk (TX3912_UART_DEBUG_INIT, "Initing serial module... (rs_debug=%d)\n", rs_debug); rc = rs_init_portstructs (); rs_init_drivers (); if (request_irq(2, rs_tx_interrupt_uarta, SA_SHIRQ | SA_INTERRUPT, "serial", &rs_ports[0])) { printk(KERN_ERR "rs: Cannot allocate irq for UARTA.\n"); rc = 0; } if (request_irq(3, rs_rx_interrupt_uarta, SA_SHIRQ | SA_INTERRUPT, "serial", &rs_ports[0])) { printk(KERN_ERR "rs: Cannot allocate irq for UARTA.\n"); rc = 0; } IntEnable6 |= INT6_UARTARXINT; rs_enable_rx_interrupts(&rs_ports[0]); #ifndef CONFIG_SERIAL_TX3912_CONSOLE { unsigned int scratch = 0; /* Setup master clock for UART */ scratch = inl(TX3912_CLK_CTRL_BASE); scratch &= ~TX3912_CLK_CTRL_SIBMCLKDIV_MASK; scratch |= ((0x2 << TX3912_CLK_CTRL_SIBMCLKDIV_SHIFT) & TX3912_CLK_CTRL_SIBMCLKDIV_MASK) | TX3912_CLK_CTRL_SIBMCLKDIR | TX3912_CLK_CTRL_ENSIBMCLK | TX3912_CLK_CTRL_CSERSEL; outl(scratch, TX3912_CLK_CTRL_BASE); /* Configure UARTA clock */ scratch = inl(TX3912_CLK_CTRL_BASE); scratch |= ((0x3 << TX3912_CLK_CTRL_CSERDIV_SHIFT) & TX3912_CLK_CTRL_CSERDIV_MASK) | TX3912_CLK_CTRL_ENCSERCLK | TX3912_CLK_CTRL_ENUARTACLK; outl(scratch, TX3912_CLK_CTRL_BASE); /* Setup UARTA for 115200,8N1 */ outl(0, TX3912_UARTA_BASE + TX3912_UART_CTRL1); outl(TX3912_UART_CTRL2_B115200, TX3912_UARTA_BASE + TX3912_UART_CTRL2); outl(0, TX3912_UARTA_BASE + TX3912_UART_DMA_CTRL1); outl(0, TX3912_UARTA_BASE + TX3912_UART_DMA_CTRL2); /* Enable UARTA */ outl(TX3912_UART_CTRL1_ENUART, TX3912_UARTA_BASE + TX3912_UART_CTRL1); while (~inl(TX3912_UARTA_BASE + TX3912_UART_CTRL1) & TX3912_UART_CTRL1_UARTON); } #endif /* Note: I didn't do anything to enable the second UART */ if (rc >= 0) rs_initialized++; func_exit(); } /* * Begin serial console routines */ #ifdef CONFIG_SERIAL_TX3912_CONSOLE void serial_outc(unsigned char c) { int i; unsigned long int2; #define BUSY_WAIT 10000 /* * Turn UARTA interrupts off */ int2 = IntEnable2; IntEnable2 &= ~(INT2_UARTATXINT | INT2_UARTATXOVERRUN | INT2_UARTAEMPTY); /* * The UART_TX_EMPTY bit in UartA_Ctrl1 seems * not to be very reliable :-( * * Wait for the Tx register to become empty */ for (i = 0; !(IntStatus2 & INT2_UARTATXINT) && (i < BUSY_WAIT); i++); IntClear2 = INT2_UARTATXINT | INT2_UARTATXOVERRUN | INT2_UARTAEMPTY; UartA_Data = c; for (i = 0; !(IntStatus2 & INT2_UARTATXINT) && (i < BUSY_WAIT); i++); IntClear2 = INT2_UARTATXINT | INT2_UARTATXOVERRUN | INT2_UARTAEMPTY; IntEnable2 = int2; } static int serial_console_wait_key(struct console *co) { unsigned int int2, res; int2 = IntEnable2; IntEnable2 = 0; while (!(UartA_Ctrl1 & UART_RX_HOLD_FULL)); res = UartA_Data; udelay(10); IntEnable2 = int2; return res; } static void serial_console_write(struct console *co, const char *s, unsigned count) { unsigned int i; for (i = 0; i < count; i++) { if (*s == '\n') serial_outc('\r'); serial_outc(*s++); } } static kdev_t serial_console_device(struct console *c) { return MKDEV(TTY_MAJOR, 64 + c->index); } static __init int serial_console_setup(struct console *co, char *options) { unsigned int scratch = 0; /* Setup master clock for UART */ scratch = inl(TX3912_CLK_CTRL_BASE); scratch &= ~TX3912_CLK_CTRL_SIBMCLKDIV_MASK; scratch |= ((0x2 << TX3912_CLK_CTRL_SIBMCLKDIV_SHIFT) & TX3912_CLK_CTRL_SIBMCLKDIV_MASK) | TX3912_CLK_CTRL_SIBMCLKDIR | TX3912_CLK_CTRL_ENSIBMCLK | TX3912_CLK_CTRL_CSERSEL; outl(scratch, TX3912_CLK_CTRL_BASE); /* Configure UARTA clock */ scratch = inl(TX3912_CLK_CTRL_BASE); scratch |= ((0x3 << TX3912_CLK_CTRL_CSERDIV_SHIFT) & TX3912_CLK_CTRL_CSERDIV_MASK) | TX3912_CLK_CTRL_ENCSERCLK | TX3912_CLK_CTRL_ENUARTACLK; outl(scratch, TX3912_CLK_CTRL_BASE); /* Setup UARTA for 115200,8N1 */ outl(0, TX3912_UARTA_BASE + TX3912_UART_CTRL1); outl(TX3912_UART_CTRL2_B115200, TX3912_UARTA_BASE + TX3912_UART_CTRL2); outl(0, TX3912_UARTA_BASE + TX3912_UART_DMA_CTRL1); outl(0, TX3912_UARTA_BASE + TX3912_UART_DMA_CTRL2); /* Enable UARTA */ outl(TX3912_UART_CTRL1_ENUART, TX3912_UARTA_BASE + TX3912_UART_CTRL1); while (~inl(TX3912_UARTA_BASE + TX3912_UART_CTRL1) & TX3912_UART_CTRL1_UARTON); return 0; } static struct console sercons = { name: "ttyS", write: serial_console_write, device: serial_console_device, wait_key: serial_console_wait_key, setup: serial_console_setup, flags: CON_PRINTBUFFER, index: -1 }; void __init tx3912_console_init(void) { register_console(&sercons); } #endif