/* * drivers/serial/serial_txx9.c * * Derived from many drivers using generic_serial interface, * especially serial_tx3912.c by Steven J. Hill and r39xx_serial.c * (was in Linux/VR tree) by Jim Pick. * * Copyright (C) 1999 Harald Koerfgen * Copyright (C) 2000 Jim Pick <jim@jimpick.com> * Copyright (C) 2001 Steven J. Hill (sjhill@realitydiluted.com) * Copyright (C) 2000-2002 Toshiba Corporation * * 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 TX3927/TX4927/TX4925/TX4938 internal SIO controller * * Revision History: * 0.30 Initial revision. (Renamed from serial_txx927.c) * 0.31 Use save_flags instead of local_irq_save. * 0.32 Support SCLK. * 0.33 Switch TXX9_TTY_NAME by CONFIG_SERIAL_TXX9_STDSERIAL. * Support TIOCSERGETLSR. * 0.34 Support slow baudrate. * 0.40 Merge codes from mainstream kernel (2.4.22). * 0.41 Fix console checking in rs_shutdown_port(). * Disable flow-control in serial_console_write(). * 0.42 Fix minor compiler warning. * 1.00 Kernel 2.6. Converted to new serial core (based on 8250.c). * 1.01 Set fifosize to make tx_empry called properly. * Use standard uart_get_divisor. * 1.02 Cleanup. (import 8250.c changes) * 1.03 Fix low-latency mode. (import 8250.c changes) * 1.04 Remove usage of deprecated functions, cleanup. * 1.05 More strict check in verify_port. Cleanup. * 1.06 Do not insert a char caused previous overrun. * Fix some spin_locks. * Do not call uart_add_one_port for absent ports. */ #include <linux/config.h> #if defined(CONFIG_SERIAL_TXX9_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) #define SUPPORT_SYSRQ #endif #include <linux/module.h> #include <linux/ioport.h> #include <linux/init.h> #include <linux/console.h> #include <linux/sysrq.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/pci.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/serial_core.h> #include <linux/serial.h> #include <linux/mutex.h> #include <asm/io.h> #include <asm/irq.h> static char *serial_version = "1.06"; static char *serial_name = "TX39/49 Serial driver"; #define PASS_LIMIT 256 #if !defined(CONFIG_SERIAL_TXX9_STDSERIAL) /* "ttyS" is used for standard serial driver */ #define TXX9_TTY_NAME "ttyTX" #define TXX9_TTY_DEVFS_NAME "tttx/" #define TXX9_TTY_MINOR_START (64 + 64) /* ttyTX0(128), ttyTX1(129) */ #else /* acts like standard serial driver */ #define TXX9_TTY_NAME "ttyS" #define TXX9_TTY_DEVFS_NAME "tts/" #define TXX9_TTY_MINOR_START 64 #endif #define TXX9_TTY_MAJOR TTY_MAJOR /* flag aliases */ #define UPF_TXX9_HAVE_CTS_LINE UPF_BUGGY_UART #define UPF_TXX9_USE_SCLK UPF_MAGIC_MULTIPLIER #ifdef CONFIG_PCI /* support for Toshiba TC86C001 SIO */ #define ENABLE_SERIAL_TXX9_PCI #endif /* * Number of serial ports */ #ifdef ENABLE_SERIAL_TXX9_PCI #define NR_PCI_BOARDS 4 #define UART_NR (4 + NR_PCI_BOARDS) #else #define UART_NR 4 #endif #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) struct uart_txx9_port { struct uart_port port; /* * We provide a per-port pm hook. */ void (*pm)(struct uart_port *port, unsigned int state, unsigned int old); }; #define TXX9_REGION_SIZE 0x24 /* TXX9 Serial Registers */ #define TXX9_SILCR 0x00 #define TXX9_SIDICR 0x04 #define TXX9_SIDISR 0x08 #define TXX9_SICISR 0x0c #define TXX9_SIFCR 0x10 #define TXX9_SIFLCR 0x14 #define TXX9_SIBGR 0x18 #define TXX9_SITFIFO 0x1c #define TXX9_SIRFIFO 0x20 /* SILCR : Line Control */ #define TXX9_SILCR_SCS_MASK 0x00000060 #define TXX9_SILCR_SCS_IMCLK 0x00000000 #define TXX9_SILCR_SCS_IMCLK_BG 0x00000020 #define TXX9_SILCR_SCS_SCLK 0x00000040 #define TXX9_SILCR_SCS_SCLK_BG 0x00000060 #define TXX9_SILCR_UEPS 0x00000010 #define TXX9_SILCR_UPEN 0x00000008 #define TXX9_SILCR_USBL_MASK 0x00000004 #define TXX9_SILCR_USBL_1BIT 0x00000000 #define TXX9_SILCR_USBL_2BIT 0x00000004 #define TXX9_SILCR_UMODE_MASK 0x00000003 #define TXX9_SILCR_UMODE_8BIT 0x00000000 #define TXX9_SILCR_UMODE_7BIT 0x00000001 /* SIDICR : DMA/Int. Control */ #define TXX9_SIDICR_TDE 0x00008000 #define TXX9_SIDICR_RDE 0x00004000 #define TXX9_SIDICR_TIE 0x00002000 #define TXX9_SIDICR_RIE 0x00001000 #define TXX9_SIDICR_SPIE 0x00000800 #define TXX9_SIDICR_CTSAC 0x00000600 #define TXX9_SIDICR_STIE_MASK 0x0000003f #define TXX9_SIDICR_STIE_OERS 0x00000020 #define TXX9_SIDICR_STIE_CTSS 0x00000010 #define TXX9_SIDICR_STIE_RBRKD 0x00000008 #define TXX9_SIDICR_STIE_TRDY 0x00000004 #define TXX9_SIDICR_STIE_TXALS 0x00000002 #define TXX9_SIDICR_STIE_UBRKD 0x00000001 /* SIDISR : DMA/Int. Status */ #define TXX9_SIDISR_UBRK 0x00008000 #define TXX9_SIDISR_UVALID 0x00004000 #define TXX9_SIDISR_UFER 0x00002000 #define TXX9_SIDISR_UPER 0x00001000 #define TXX9_SIDISR_UOER 0x00000800 #define TXX9_SIDISR_ERI 0x00000400 #define TXX9_SIDISR_TOUT 0x00000200 #define TXX9_SIDISR_TDIS 0x00000100 #define TXX9_SIDISR_RDIS 0x00000080 #define TXX9_SIDISR_STIS 0x00000040 #define TXX9_SIDISR_RFDN_MASK 0x0000001f /* SICISR : Change Int. Status */ #define TXX9_SICISR_OERS 0x00000020 #define TXX9_SICISR_CTSS 0x00000010 #define TXX9_SICISR_RBRKD 0x00000008 #define TXX9_SICISR_TRDY 0x00000004 #define TXX9_SICISR_TXALS 0x00000002 #define TXX9_SICISR_UBRKD 0x00000001 /* SIFCR : FIFO Control */ #define TXX9_SIFCR_SWRST 0x00008000 #define TXX9_SIFCR_RDIL_MASK 0x00000180 #define TXX9_SIFCR_RDIL_1 0x00000000 #define TXX9_SIFCR_RDIL_4 0x00000080 #define TXX9_SIFCR_RDIL_8 0x00000100 #define TXX9_SIFCR_RDIL_12 0x00000180 #define TXX9_SIFCR_RDIL_MAX 0x00000180 #define TXX9_SIFCR_TDIL_MASK 0x00000018 #define TXX9_SIFCR_TDIL_MASK 0x00000018 #define TXX9_SIFCR_TDIL_1 0x00000000 #define TXX9_SIFCR_TDIL_4 0x00000001 #define TXX9_SIFCR_TDIL_8 0x00000010 #define TXX9_SIFCR_TDIL_MAX 0x00000010 #define TXX9_SIFCR_TFRST 0x00000004 #define TXX9_SIFCR_RFRST 0x00000002 #define TXX9_SIFCR_FRSTE 0x00000001 #define TXX9_SIO_TX_FIFO 8 #define TXX9_SIO_RX_FIFO 16 /* SIFLCR : Flow Control */ #define TXX9_SIFLCR_RCS 0x00001000 #define TXX9_SIFLCR_TES 0x00000800 #define TXX9_SIFLCR_RTSSC 0x00000200 #define TXX9_SIFLCR_RSDE 0x00000100 #define TXX9_SIFLCR_TSDE 0x00000080 #define TXX9_SIFLCR_RTSTL_MASK 0x0000001e #define TXX9_SIFLCR_RTSTL_MAX 0x0000001e #define TXX9_SIFLCR_TBRK 0x00000001 /* SIBGR : Baudrate Control */ #define TXX9_SIBGR_BCLK_MASK 0x00000300 #define TXX9_SIBGR_BCLK_T0 0x00000000 #define TXX9_SIBGR_BCLK_T2 0x00000100 #define TXX9_SIBGR_BCLK_T4 0x00000200 #define TXX9_SIBGR_BCLK_T6 0x00000300 #define TXX9_SIBGR_BRD_MASK 0x000000ff static inline unsigned int sio_in(struct uart_txx9_port *up, int offset) { switch (up->port.iotype) { default: return __raw_readl(up->port.membase + offset); case UPIO_PORT: return inl(up->port.iobase + offset); } } static inline void sio_out(struct uart_txx9_port *up, int offset, int value) { switch (up->port.iotype) { default: __raw_writel(value, up->port.membase + offset); break; case UPIO_PORT: outl(value, up->port.iobase + offset); break; } } static inline void sio_mask(struct uart_txx9_port *up, int offset, unsigned int value) { sio_out(up, offset, sio_in(up, offset) & ~value); } static inline void sio_set(struct uart_txx9_port *up, int offset, unsigned int value) { sio_out(up, offset, sio_in(up, offset) | value); } static inline void sio_quot_set(struct uart_txx9_port *up, int quot) { quot >>= 1; if (quot < 256) sio_out(up, TXX9_SIBGR, quot | TXX9_SIBGR_BCLK_T0); else if (quot < (256 << 2)) sio_out(up, TXX9_SIBGR, (quot >> 2) | TXX9_SIBGR_BCLK_T2); else if (quot < (256 << 4)) sio_out(up, TXX9_SIBGR, (quot >> 4) | TXX9_SIBGR_BCLK_T4); else if (quot < (256 << 6)) sio_out(up, TXX9_SIBGR, (quot >> 6) | TXX9_SIBGR_BCLK_T6); else sio_out(up, TXX9_SIBGR, 0xff | TXX9_SIBGR_BCLK_T6); } static void serial_txx9_stop_tx(struct uart_port *port) { struct uart_txx9_port *up = (struct uart_txx9_port *)port; sio_mask(up, TXX9_SIDICR, TXX9_SIDICR_TIE); } static void serial_txx9_start_tx(struct uart_port *port) { struct uart_txx9_port *up = (struct uart_txx9_port *)port; sio_set(up, TXX9_SIDICR, TXX9_SIDICR_TIE); } static void serial_txx9_stop_rx(struct uart_port *port) { struct uart_txx9_port *up = (struct uart_txx9_port *)port; up->port.read_status_mask &= ~TXX9_SIDISR_RDIS; } static void serial_txx9_enable_ms(struct uart_port *port) { /* TXX9-SIO can not control DTR... */ } static inline void receive_chars(struct uart_txx9_port *up, unsigned int *status, struct pt_regs *regs) { struct tty_struct *tty = up->port.info->tty; unsigned char ch; unsigned int disr = *status; int max_count = 256; char flag; unsigned int next_ignore_status_mask; do { ch = sio_in(up, TXX9_SIRFIFO); flag = TTY_NORMAL; up->port.icount.rx++; /* mask out RFDN_MASK bit added by previous overrun */ next_ignore_status_mask = up->port.ignore_status_mask & ~TXX9_SIDISR_RFDN_MASK; if (unlikely(disr & (TXX9_SIDISR_UBRK | TXX9_SIDISR_UPER | TXX9_SIDISR_UFER | TXX9_SIDISR_UOER))) { /* * For statistics only */ if (disr & TXX9_SIDISR_UBRK) { disr &= ~(TXX9_SIDISR_UFER | TXX9_SIDISR_UPER); up->port.icount.brk++; /* * We do the SysRQ and SAK checking * here because otherwise the break * may get masked by ignore_status_mask * or read_status_mask. */ if (uart_handle_break(&up->port)) goto ignore_char; } else if (disr & TXX9_SIDISR_UPER) up->port.icount.parity++; else if (disr & TXX9_SIDISR_UFER) up->port.icount.frame++; if (disr & TXX9_SIDISR_UOER) { up->port.icount.overrun++; /* * The receiver read buffer still hold * a char which caused overrun. * Ignore next char by adding RFDN_MASK * to ignore_status_mask temporarily. */ next_ignore_status_mask |= TXX9_SIDISR_RFDN_MASK; } /* * Mask off conditions which should be ingored. */ disr &= up->port.read_status_mask; if (disr & TXX9_SIDISR_UBRK) { flag = TTY_BREAK; } else if (disr & TXX9_SIDISR_UPER) flag = TTY_PARITY; else if (disr & TXX9_SIDISR_UFER) flag = TTY_FRAME; } if (uart_handle_sysrq_char(&up->port, ch, regs)) goto ignore_char; uart_insert_char(&up->port, disr, TXX9_SIDISR_UOER, ch, flag); ignore_char: up->port.ignore_status_mask = next_ignore_status_mask; disr = sio_in(up, TXX9_SIDISR); } while (!(disr & TXX9_SIDISR_UVALID) && (max_count-- > 0)); spin_unlock(&up->port.lock); tty_flip_buffer_push(tty); spin_lock(&up->port.lock); *status = disr; } static inline void transmit_chars(struct uart_txx9_port *up) { struct circ_buf *xmit = &up->port.info->xmit; int count; if (up->port.x_char) { sio_out(up, TXX9_SITFIFO, up->port.x_char); up->port.icount.tx++; up->port.x_char = 0; return; } if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { serial_txx9_stop_tx(&up->port); return; } count = TXX9_SIO_TX_FIFO; do { sio_out(up, TXX9_SITFIFO, xmit->buf[xmit->tail]); xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); up->port.icount.tx++; if (uart_circ_empty(xmit)) break; } while (--count > 0); if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(&up->port); if (uart_circ_empty(xmit)) serial_txx9_stop_tx(&up->port); } static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id, struct pt_regs *regs) { int pass_counter = 0; struct uart_txx9_port *up = dev_id; unsigned int status; while (1) { spin_lock(&up->port.lock); status = sio_in(up, TXX9_SIDISR); if (!(sio_in(up, TXX9_SIDICR) & TXX9_SIDICR_TIE)) status &= ~TXX9_SIDISR_TDIS; if (!(status & (TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS | TXX9_SIDISR_TOUT))) { spin_unlock(&up->port.lock); break; } if (status & TXX9_SIDISR_RDIS) receive_chars(up, &status, regs); if (status & TXX9_SIDISR_TDIS) transmit_chars(up); /* Clear TX/RX Int. Status */ sio_mask(up, TXX9_SIDISR, TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS | TXX9_SIDISR_TOUT); spin_unlock(&up->port.lock); if (pass_counter++ > PASS_LIMIT) break; } return pass_counter ? IRQ_HANDLED : IRQ_NONE; } static unsigned int serial_txx9_tx_empty(struct uart_port *port) { struct uart_txx9_port *up = (struct uart_txx9_port *)port; unsigned long flags; unsigned int ret; spin_lock_irqsave(&up->port.lock, flags); ret = (sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS) ? TIOCSER_TEMT : 0; spin_unlock_irqrestore(&up->port.lock, flags); return ret; } static unsigned int serial_txx9_get_mctrl(struct uart_port *port) { struct uart_txx9_port *up = (struct uart_txx9_port *)port; unsigned int ret; ret = ((sio_in(up, TXX9_SIFLCR) & TXX9_SIFLCR_RTSSC) ? 0 : TIOCM_RTS) | ((sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS) ? 0 : TIOCM_CTS); return ret; } static void serial_txx9_set_mctrl(struct uart_port *port, unsigned int mctrl) { struct uart_txx9_port *up = (struct uart_txx9_port *)port; if (mctrl & TIOCM_RTS) sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC); else sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC); } static void serial_txx9_break_ctl(struct uart_port *port, int break_state) { struct uart_txx9_port *up = (struct uart_txx9_port *)port; unsigned long flags; spin_lock_irqsave(&up->port.lock, flags); if (break_state == -1) sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK); else sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK); spin_unlock_irqrestore(&up->port.lock, flags); } static int serial_txx9_startup(struct uart_port *port) { struct uart_txx9_port *up = (struct uart_txx9_port *)port; unsigned long flags; int retval; /* * Clear the FIFO buffers and disable them. * (they will be reenabled in set_termios()) */ sio_set(up, TXX9_SIFCR, TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE); /* clear reset */ sio_mask(up, TXX9_SIFCR, TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE); sio_out(up, TXX9_SIDICR, 0); /* * Clear the interrupt registers. */ sio_out(up, TXX9_SIDISR, 0); retval = request_irq(up->port.irq, serial_txx9_interrupt, SA_SHIRQ, "serial_txx9", up); if (retval) return retval; /* * Now, initialize the UART */ spin_lock_irqsave(&up->port.lock, flags); serial_txx9_set_mctrl(&up->port, up->port.mctrl); spin_unlock_irqrestore(&up->port.lock, flags); /* Enable RX/TX */ sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE); /* * Finally, enable interrupts. */ sio_set(up, TXX9_SIDICR, TXX9_SIDICR_RIE); return 0; } static void serial_txx9_shutdown(struct uart_port *port) { struct uart_txx9_port *up = (struct uart_txx9_port *)port; unsigned long flags; /* * Disable interrupts from this port */ sio_out(up, TXX9_SIDICR, 0); /* disable all intrs */ spin_lock_irqsave(&up->port.lock, flags); serial_txx9_set_mctrl(&up->port, up->port.mctrl); spin_unlock_irqrestore(&up->port.lock, flags); /* * Disable break condition */ sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK); #ifdef CONFIG_SERIAL_TXX9_CONSOLE if (up->port.cons && up->port.line == up->port.cons->index) { free_irq(up->port.irq, up); return; } #endif /* reset FIFOs */ sio_set(up, TXX9_SIFCR, TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE); /* clear reset */ sio_mask(up, TXX9_SIFCR, TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE); /* Disable RX/TX */ sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE); free_irq(up->port.irq, up); } static void serial_txx9_set_termios(struct uart_port *port, struct termios *termios, struct termios *old) { struct uart_txx9_port *up = (struct uart_txx9_port *)port; unsigned int cval, fcr = 0; unsigned long flags; unsigned int baud, quot; cval = sio_in(up, TXX9_SILCR); /* byte size and parity */ cval &= ~TXX9_SILCR_UMODE_MASK; switch (termios->c_cflag & CSIZE) { case CS7: cval |= TXX9_SILCR_UMODE_7BIT; break; default: case CS5: /* not supported */ case CS6: /* not supported */ case CS8: cval |= TXX9_SILCR_UMODE_8BIT; break; } cval &= ~TXX9_SILCR_USBL_MASK; if (termios->c_cflag & CSTOPB) cval |= TXX9_SILCR_USBL_2BIT; else cval |= TXX9_SILCR_USBL_1BIT; cval &= ~(TXX9_SILCR_UPEN | TXX9_SILCR_UEPS); if (termios->c_cflag & PARENB) cval |= TXX9_SILCR_UPEN; if (!(termios->c_cflag & PARODD)) cval |= TXX9_SILCR_UEPS; /* * Ask the core to calculate the divisor for us. */ baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16/2); quot = uart_get_divisor(port, baud); /* Set up FIFOs */ /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */ fcr = TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1; /* * Ok, we're now changing the port state. Do it with * interrupts disabled. */ spin_lock_irqsave(&up->port.lock, flags); /* * Update the per-port timeout. */ uart_update_timeout(port, termios->c_cflag, baud); up->port.read_status_mask = TXX9_SIDISR_UOER | TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS; if (termios->c_iflag & INPCK) up->port.read_status_mask |= TXX9_SIDISR_UFER | TXX9_SIDISR_UPER; if (termios->c_iflag & (BRKINT | PARMRK)) up->port.read_status_mask |= TXX9_SIDISR_UBRK; /* * Characteres to ignore */ up->port.ignore_status_mask = 0; if (termios->c_iflag & IGNPAR) up->port.ignore_status_mask |= TXX9_SIDISR_UPER | TXX9_SIDISR_UFER; if (termios->c_iflag & IGNBRK) { up->port.ignore_status_mask |= TXX9_SIDISR_UBRK; /* * If we're ignoring parity and break indicators, * ignore overruns too (for real raw support). */ if (termios->c_iflag & IGNPAR) up->port.ignore_status_mask |= TXX9_SIDISR_UOER; } /* * ignore all characters if CREAD is not set */ if ((termios->c_cflag & CREAD) == 0) up->port.ignore_status_mask |= TXX9_SIDISR_RDIS; /* CTS flow control flag */ if ((termios->c_cflag & CRTSCTS) && (up->port.flags & UPF_TXX9_HAVE_CTS_LINE)) { sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES); } else { sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES); } sio_out(up, TXX9_SILCR, cval); sio_quot_set(up, quot); sio_out(up, TXX9_SIFCR, fcr); serial_txx9_set_mctrl(&up->port, up->port.mctrl); spin_unlock_irqrestore(&up->port.lock, flags); } static void serial_txx9_pm(struct uart_port *port, unsigned int state, unsigned int oldstate) { struct uart_txx9_port *up = (struct uart_txx9_port *)port; if (up->pm) up->pm(port, state, oldstate); } static int serial_txx9_request_resource(struct uart_txx9_port *up) { unsigned int size = TXX9_REGION_SIZE; int ret = 0; switch (up->port.iotype) { default: if (!up->port.mapbase) break; if (!request_mem_region(up->port.mapbase, size, "serial_txx9")) { ret = -EBUSY; break; } if (up->port.flags & UPF_IOREMAP) { up->port.membase = ioremap(up->port.mapbase, size); if (!up->port.membase) { release_mem_region(up->port.mapbase, size); ret = -ENOMEM; } } break; case UPIO_PORT: if (!request_region(up->port.iobase, size, "serial_txx9")) ret = -EBUSY; break; } return ret; } static void serial_txx9_release_resource(struct uart_txx9_port *up) { unsigned int size = TXX9_REGION_SIZE; switch (up->port.iotype) { default: if (!up->port.mapbase) break; if (up->port.flags & UPF_IOREMAP) { iounmap(up->port.membase); up->port.membase = NULL; } release_mem_region(up->port.mapbase, size); break; case UPIO_PORT: release_region(up->port.iobase, size); break; } } static void serial_txx9_release_port(struct uart_port *port) { struct uart_txx9_port *up = (struct uart_txx9_port *)port; serial_txx9_release_resource(up); } static int serial_txx9_request_port(struct uart_port *port) { struct uart_txx9_port *up = (struct uart_txx9_port *)port; return serial_txx9_request_resource(up); } static void serial_txx9_config_port(struct uart_port *port, int uflags) { struct uart_txx9_port *up = (struct uart_txx9_port *)port; unsigned long flags; int ret; /* * Find the region that we can probe for. This in turn * tells us whether we can probe for the type of port. */ ret = serial_txx9_request_resource(up); if (ret < 0) return; port->type = PORT_TXX9; up->port.fifosize = TXX9_SIO_TX_FIFO; #ifdef CONFIG_SERIAL_TXX9_CONSOLE if (up->port.line == up->port.cons->index) return; #endif spin_lock_irqsave(&up->port.lock, flags); /* * Reset the UART. */ sio_out(up, TXX9_SIFCR, TXX9_SIFCR_SWRST); #ifdef CONFIG_CPU_TX49XX /* TX4925 BUG WORKAROUND. Accessing SIOC register * immediately after soft reset causes bus error. */ iob(); udelay(1); #endif while (sio_in(up, TXX9_SIFCR) & TXX9_SIFCR_SWRST) ; /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */ sio_set(up, TXX9_SIFCR, TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1); /* initial settings */ sio_out(up, TXX9_SILCR, TXX9_SILCR_UMODE_8BIT | TXX9_SILCR_USBL_1BIT | ((up->port.flags & UPF_TXX9_USE_SCLK) ? TXX9_SILCR_SCS_SCLK_BG : TXX9_SILCR_SCS_IMCLK_BG)); sio_quot_set(up, uart_get_divisor(port, 9600)); sio_out(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSTL_MAX /* 15 */); spin_unlock_irqrestore(&up->port.lock, flags); } static int serial_txx9_verify_port(struct uart_port *port, struct serial_struct *ser) { unsigned long new_port = ser->port; if (HIGH_BITS_OFFSET) new_port += (unsigned long)ser->port_high << HIGH_BITS_OFFSET; if (ser->type != port->type || ser->irq != port->irq || ser->io_type != port->iotype || new_port != port->iobase || (unsigned long)ser->iomem_base != port->mapbase) return -EINVAL; return 0; } static const char * serial_txx9_type(struct uart_port *port) { return "txx9"; } static struct uart_ops serial_txx9_pops = { .tx_empty = serial_txx9_tx_empty, .set_mctrl = serial_txx9_set_mctrl, .get_mctrl = serial_txx9_get_mctrl, .stop_tx = serial_txx9_stop_tx, .start_tx = serial_txx9_start_tx, .stop_rx = serial_txx9_stop_rx, .enable_ms = serial_txx9_enable_ms, .break_ctl = serial_txx9_break_ctl, .startup = serial_txx9_startup, .shutdown = serial_txx9_shutdown, .set_termios = serial_txx9_set_termios, .pm = serial_txx9_pm, .type = serial_txx9_type, .release_port = serial_txx9_release_port, .request_port = serial_txx9_request_port, .config_port = serial_txx9_config_port, .verify_port = serial_txx9_verify_port, }; static struct uart_txx9_port serial_txx9_ports[UART_NR]; static void __init serial_txx9_register_ports(struct uart_driver *drv) { int i; for (i = 0; i < UART_NR; i++) { struct uart_txx9_port *up = &serial_txx9_ports[i]; up->port.line = i; up->port.ops = &serial_txx9_pops; if (up->port.iobase || up->port.mapbase) uart_add_one_port(drv, &up->port); } } #ifdef CONFIG_SERIAL_TXX9_CONSOLE /* * Wait for transmitter & holding register to empty */ static inline void wait_for_xmitr(struct uart_txx9_port *up) { unsigned int tmout = 10000; /* Wait up to 10ms for the character(s) to be sent. */ while (--tmout && !(sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS)) udelay(1); /* Wait up to 1s for flow control if necessary */ if (up->port.flags & UPF_CONS_FLOW) { tmout = 1000000; while (--tmout && (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS)) udelay(1); } } static void serial_txx9_console_putchar(struct uart_port *port, int ch) { struct uart_txx9_port *up = (struct uart_txx9_port *)port; wait_for_xmitr(up); sio_out(up, TXX9_SITFIFO, ch); } /* * Print a string to the serial port trying not to disturb * any possible real use of the port... * * The console_lock must be held when we get here. */ static void serial_txx9_console_write(struct console *co, const char *s, unsigned int count) { struct uart_txx9_port *up = &serial_txx9_ports[co->index]; unsigned int ier, flcr; /* * First save the UER then disable the interrupts */ ier = sio_in(up, TXX9_SIDICR); sio_out(up, TXX9_SIDICR, 0); /* * Disable flow-control if enabled (and unnecessary) */ flcr = sio_in(up, TXX9_SIFLCR); if (!(up->port.flags & UPF_CONS_FLOW) && (flcr & TXX9_SIFLCR_TES)) sio_out(up, TXX9_SIFLCR, flcr & ~TXX9_SIFLCR_TES); uart_console_write(&up->port, s, count, serial_txx9_console_putchar); /* * Finally, wait for transmitter to become empty * and restore the IER */ wait_for_xmitr(up); sio_out(up, TXX9_SIFLCR, flcr); sio_out(up, TXX9_SIDICR, ier); } static int serial_txx9_console_setup(struct console *co, char *options) { struct uart_port *port; struct uart_txx9_port *up; int baud = 9600; int bits = 8; int parity = 'n'; int flow = 'n'; /* * Check whether an invalid uart number has been specified, and * if so, search for the first available port that does have * console support. */ if (co->index >= UART_NR) co->index = 0; up = &serial_txx9_ports[co->index]; port = &up->port; if (!port->ops) return -ENODEV; /* * Disable UART interrupts, set DTR and RTS high * and set speed. */ sio_out(up, TXX9_SIDICR, 0); /* initial settings */ sio_out(up, TXX9_SILCR, TXX9_SILCR_UMODE_8BIT | TXX9_SILCR_USBL_1BIT | ((port->flags & UPF_TXX9_USE_SCLK) ? TXX9_SILCR_SCS_SCLK_BG : TXX9_SILCR_SCS_IMCLK_BG)); sio_out(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSTL_MAX /* 15 */); if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); return uart_set_options(port, co, baud, parity, bits, flow); } static struct uart_driver serial_txx9_reg; static struct console serial_txx9_console = { .name = TXX9_TTY_NAME, .write = serial_txx9_console_write, .device = uart_console_device, .setup = serial_txx9_console_setup, .flags = CON_PRINTBUFFER, .index = -1, .data = &serial_txx9_reg, }; static int __init serial_txx9_console_init(void) { register_console(&serial_txx9_console); return 0; } console_initcall(serial_txx9_console_init); #define SERIAL_TXX9_CONSOLE &serial_txx9_console #else #define SERIAL_TXX9_CONSOLE NULL #endif static struct uart_driver serial_txx9_reg = { .owner = THIS_MODULE, .driver_name = "serial_txx9", .devfs_name = TXX9_TTY_DEVFS_NAME, .dev_name = TXX9_TTY_NAME, .major = TXX9_TTY_MAJOR, .minor = TXX9_TTY_MINOR_START, .nr = UART_NR, .cons = SERIAL_TXX9_CONSOLE, }; int __init early_serial_txx9_setup(struct uart_port *port) { if (port->line >= ARRAY_SIZE(serial_txx9_ports)) return -ENODEV; serial_txx9_ports[port->line].port = *port; serial_txx9_ports[port->line].port.ops = &serial_txx9_pops; serial_txx9_ports[port->line].port.flags |= UPF_BOOT_AUTOCONF; return 0; } #ifdef ENABLE_SERIAL_TXX9_PCI /** * serial_txx9_suspend_port - suspend one serial port * @line: serial line number * @level: the level of port suspension, as per uart_suspend_port * * Suspend one serial port. */ static void serial_txx9_suspend_port(int line) { uart_suspend_port(&serial_txx9_reg, &serial_txx9_ports[line].port); } /** * serial_txx9_resume_port - resume one serial port * @line: serial line number * @level: the level of port resumption, as per uart_resume_port * * Resume one serial port. */ static void serial_txx9_resume_port(int line) { uart_resume_port(&serial_txx9_reg, &serial_txx9_ports[line].port); } static DEFINE_MUTEX(serial_txx9_mutex); /** * serial_txx9_register_port - register a serial port * @port: serial port template * * Configure the serial port specified by the request. * * The port is then probed and if necessary the IRQ is autodetected * If this fails an error is returned. * * On success the port is ready to use and the line number is returned. */ static int __devinit serial_txx9_register_port(struct uart_port *port) { int i; struct uart_txx9_port *uart; int ret = -ENOSPC; mutex_lock(&serial_txx9_mutex); for (i = 0; i < UART_NR; i++) { uart = &serial_txx9_ports[i]; if (!(uart->port.iobase || uart->port.mapbase)) break; } if (i < UART_NR) { uart->port.iobase = port->iobase; uart->port.membase = port->membase; uart->port.irq = port->irq; uart->port.uartclk = port->uartclk; uart->port.iotype = port->iotype; uart->port.flags = port->flags | UPF_BOOT_AUTOCONF; uart->port.mapbase = port->mapbase; if (port->dev) uart->port.dev = port->dev; ret = uart_add_one_port(&serial_txx9_reg, &uart->port); if (ret == 0) ret = uart->port.line; } mutex_unlock(&serial_txx9_mutex); return ret; } /** * serial_txx9_unregister_port - remove a txx9 serial port at runtime * @line: serial line number * * Remove one serial port. This may not be called from interrupt * context. We hand the port back to the our control. */ static void __devexit serial_txx9_unregister_port(int line) { struct uart_txx9_port *uart = &serial_txx9_ports[line]; mutex_lock(&serial_txx9_mutex); uart_remove_one_port(&serial_txx9_reg, &uart->port); uart->port.flags = 0; uart->port.type = PORT_UNKNOWN; uart->port.iobase = 0; uart->port.mapbase = 0; uart->port.membase = NULL; uart->port.dev = NULL; mutex_unlock(&serial_txx9_mutex); } /* * Probe one serial board. Unfortunately, there is no rhyme nor reason * to the arrangement of serial ports on a PCI card. */ static int __devinit pciserial_txx9_init_one(struct pci_dev *dev, const struct pci_device_id *ent) { struct uart_port port; int line; int rc; rc = pci_enable_device(dev); if (rc) return rc; memset(&port, 0, sizeof(port)); port.ops = &serial_txx9_pops; port.flags |= UPF_TXX9_HAVE_CTS_LINE; port.uartclk = 66670000; port.irq = dev->irq; port.iotype = UPIO_PORT; port.iobase = pci_resource_start(dev, 1); port.dev = &dev->dev; line = serial_txx9_register_port(&port); if (line < 0) { printk(KERN_WARNING "Couldn't register serial port %s: %d\n", pci_name(dev), line); } pci_set_drvdata(dev, (void *)(long)line); return 0; } static void __devexit pciserial_txx9_remove_one(struct pci_dev *dev) { int line = (int)(long)pci_get_drvdata(dev); pci_set_drvdata(dev, NULL); if (line) { serial_txx9_unregister_port(line); pci_disable_device(dev); } } static int pciserial_txx9_suspend_one(struct pci_dev *dev, pm_message_t state) { int line = (int)(long)pci_get_drvdata(dev); if (line) serial_txx9_suspend_port(line); pci_save_state(dev); pci_set_power_state(dev, pci_choose_state(dev, state)); return 0; } static int pciserial_txx9_resume_one(struct pci_dev *dev) { int line = (int)(long)pci_get_drvdata(dev); pci_set_power_state(dev, PCI_D0); pci_restore_state(dev); if (line) { pci_enable_device(dev); serial_txx9_resume_port(line); } return 0; } static struct pci_device_id serial_txx9_pci_tbl[] = { { PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_MISC, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 }, { 0, } }; static struct pci_driver serial_txx9_pci_driver = { .name = "serial_txx9", .probe = pciserial_txx9_init_one, .remove = __devexit_p(pciserial_txx9_remove_one), .suspend = pciserial_txx9_suspend_one, .resume = pciserial_txx9_resume_one, .id_table = serial_txx9_pci_tbl, }; MODULE_DEVICE_TABLE(pci, serial_txx9_pci_tbl); #endif /* ENABLE_SERIAL_TXX9_PCI */ static int __init serial_txx9_init(void) { int ret; printk(KERN_INFO "%s version %s\n", serial_name, serial_version); ret = uart_register_driver(&serial_txx9_reg); if (ret >= 0) { serial_txx9_register_ports(&serial_txx9_reg); #ifdef ENABLE_SERIAL_TXX9_PCI ret = pci_register_driver(&serial_txx9_pci_driver); #endif } return ret; } static void __exit serial_txx9_exit(void) { int i; #ifdef ENABLE_SERIAL_TXX9_PCI pci_unregister_driver(&serial_txx9_pci_driver); #endif for (i = 0; i < UART_NR; i++) { struct uart_txx9_port *up = &serial_txx9_ports[i]; if (up->port.iobase || up->port.mapbase) uart_remove_one_port(&serial_txx9_reg, &up->port); } uart_unregister_driver(&serial_txx9_reg); } module_init(serial_txx9_init); module_exit(serial_txx9_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("TX39/49 serial driver"); MODULE_ALIAS_CHARDEV_MAJOR(TXX9_TTY_MAJOR);