/* * drivers/char/vme_scc.c: MVME147, MVME162, BVME6000 SCC serial ports * implementation. * Copyright 1999 Richard Hirst <richard@sleepie.demon.co.uk> * * Based on atari_SCC.c which was * Copyright 1994-95 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> * Partially based on PC-Linux serial.c by Linus Torvalds and Theodore Ts'o * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive * for more details. * */ #include <linux/module.h> #include <linux/config.h> #include <linux/kdev_t.h> #include <asm/io.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/ioport.h> #include <linux/interrupt.h> #include <linux/errno.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/mm.h> #include <linux/serial.h> #include <linux/fcntl.h> #include <linux/major.h> #include <linux/delay.h> #include <linux/slab.h> #include <linux/miscdevice.h> #include <linux/console.h> #include <linux/init.h> #include <asm/setup.h> #include <asm/bootinfo.h> #ifdef CONFIG_MVME147_SCC #include <asm/mvme147hw.h> #endif #ifdef CONFIG_MVME162_SCC #include <asm/mvme16xhw.h> #endif #ifdef CONFIG_BVME6000_SCC #include <asm/bvme6000hw.h> #endif #include <linux/generic_serial.h> #include "scc.h" #define CHANNEL_A 0 #define CHANNEL_B 1 #define SCC_MINOR_BASE 64 /* Shadows for all SCC write registers */ static unsigned char scc_shadow[2][16]; /* Location to access for SCC register access delay */ static volatile unsigned char *scc_del = NULL; /* To keep track of STATUS_REG state for detection of Ext/Status int source */ static unsigned char scc_last_status_reg[2]; /***************************** Prototypes *****************************/ /* Function prototypes */ static void scc_disable_tx_interrupts(void * ptr); static void scc_enable_tx_interrupts(void * ptr); static void scc_disable_rx_interrupts(void * ptr); static void scc_enable_rx_interrupts(void * ptr); static int scc_get_CD(void * ptr); static void scc_shutdown_port(void * ptr); static int scc_set_real_termios(void *ptr); static void scc_hungup(void *ptr); static void scc_close(void *ptr); static int scc_chars_in_buffer(void * ptr); static int scc_open(struct tty_struct * tty, struct file * filp); static int scc_ioctl(struct tty_struct * tty, struct file * filp, unsigned int cmd, unsigned long arg); static void scc_throttle(struct tty_struct *tty); static void scc_unthrottle(struct tty_struct *tty); static irqreturn_t scc_tx_int(int irq, void *data, struct pt_regs *fp); static irqreturn_t scc_rx_int(int irq, void *data, struct pt_regs *fp); static irqreturn_t scc_stat_int(int irq, void *data, struct pt_regs *fp); static irqreturn_t scc_spcond_int(int irq, void *data, struct pt_regs *fp); static void scc_setsignals(struct scc_port *port, int dtr, int rts); static void scc_break_ctl(struct tty_struct *tty, int break_state); static struct tty_driver *scc_driver; struct scc_port scc_ports[2]; int scc_initialized = 0; /*--------------------------------------------------------------------------- * Interface from generic_serial.c back here *--------------------------------------------------------------------------*/ static struct real_driver scc_real_driver = { scc_disable_tx_interrupts, scc_enable_tx_interrupts, scc_disable_rx_interrupts, scc_enable_rx_interrupts, scc_get_CD, scc_shutdown_port, scc_set_real_termios, scc_chars_in_buffer, scc_close, scc_hungup, NULL }; static struct tty_operations scc_ops = { .open = scc_open, .close = gs_close, .write = gs_write, .put_char = gs_put_char, .flush_chars = gs_flush_chars, .write_room = gs_write_room, .chars_in_buffer = gs_chars_in_buffer, .flush_buffer = gs_flush_buffer, .ioctl = scc_ioctl, .throttle = scc_throttle, .unthrottle = scc_unthrottle, .set_termios = gs_set_termios, .stop = gs_stop, .start = gs_start, .hangup = gs_hangup, .break_ctl = scc_break_ctl, }; /*---------------------------------------------------------------------------- * vme_scc_init() and support functions *---------------------------------------------------------------------------*/ static int scc_init_drivers(void) { int error; scc_driver = alloc_tty_driver(2); if (!scc_driver) return -ENOMEM; scc_driver->owner = THIS_MODULE; scc_driver->driver_name = "scc"; scc_driver->name = "ttyS"; scc_driver->devfs_name = "tts/"; scc_driver->major = TTY_MAJOR; scc_driver->minor_start = SCC_MINOR_BASE; scc_driver->type = TTY_DRIVER_TYPE_SERIAL; scc_driver->subtype = SERIAL_TYPE_NORMAL; scc_driver->init_termios = tty_std_termios; scc_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; scc_driver->flags = TTY_DRIVER_REAL_RAW; tty_set_operations(scc_driver, &scc_ops); if ((error = tty_register_driver(scc_driver))) { printk(KERN_ERR "scc: Couldn't register scc driver, error = %d\n", error); put_tty_driver(scc_driver); return 1; } return 0; } /* ports[] array is indexed by line no (i.e. [0] for ttyS0, [1] for ttyS1). */ static void scc_init_portstructs(void) { struct scc_port *port; int i; for (i = 0; i < 2; i++) { port = scc_ports + i; port->gs.magic = SCC_MAGIC; port->gs.close_delay = HZ/2; port->gs.closing_wait = 30 * HZ; port->gs.rd = &scc_real_driver; #ifdef NEW_WRITE_LOCKING port->gs.port_write_sem = MUTEX; #endif init_waitqueue_head(&port->gs.open_wait); init_waitqueue_head(&port->gs.close_wait); } } #ifdef CONFIG_MVME147_SCC static int mvme147_scc_init(void) { struct scc_port *port; printk(KERN_INFO "SCC: MVME147 Serial Driver\n"); /* Init channel A */ port = &scc_ports[0]; port->channel = CHANNEL_A; port->ctrlp = (volatile unsigned char *)M147_SCC_A_ADDR; port->datap = port->ctrlp + 1; port->port_a = &scc_ports[0]; port->port_b = &scc_ports[1]; request_irq(MVME147_IRQ_SCCA_TX, scc_tx_int, SA_INTERRUPT, "SCC-A TX", port); request_irq(MVME147_IRQ_SCCA_STAT, scc_stat_int, SA_INTERRUPT, "SCC-A status", port); request_irq(MVME147_IRQ_SCCA_RX, scc_rx_int, SA_INTERRUPT, "SCC-A RX", port); request_irq(MVME147_IRQ_SCCA_SPCOND, scc_spcond_int, SA_INTERRUPT, "SCC-A special cond", port); { SCC_ACCESS_INIT(port); /* disable interrupts for this channel */ SCCwrite(INT_AND_DMA_REG, 0); /* Set the interrupt vector */ SCCwrite(INT_VECTOR_REG, MVME147_IRQ_SCC_BASE); /* Interrupt parameters: vector includes status, status low */ SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT); SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB); } /* Init channel B */ port = &scc_ports[1]; port->channel = CHANNEL_B; port->ctrlp = (volatile unsigned char *)M147_SCC_B_ADDR; port->datap = port->ctrlp + 1; port->port_a = &scc_ports[0]; port->port_b = &scc_ports[1]; request_irq(MVME147_IRQ_SCCB_TX, scc_tx_int, SA_INTERRUPT, "SCC-B TX", port); request_irq(MVME147_IRQ_SCCB_STAT, scc_stat_int, SA_INTERRUPT, "SCC-B status", port); request_irq(MVME147_IRQ_SCCB_RX, scc_rx_int, SA_INTERRUPT, "SCC-B RX", port); request_irq(MVME147_IRQ_SCCB_SPCOND, scc_spcond_int, SA_INTERRUPT, "SCC-B special cond", port); { SCC_ACCESS_INIT(port); /* disable interrupts for this channel */ SCCwrite(INT_AND_DMA_REG, 0); } /* Ensure interrupts are enabled in the PCC chip */ m147_pcc->serial_cntrl=PCC_LEVEL_SERIAL|PCC_INT_ENAB; /* Initialise the tty driver structures and register */ scc_init_portstructs(); scc_init_drivers(); return 0; } #endif #ifdef CONFIG_MVME162_SCC static int mvme162_scc_init(void) { struct scc_port *port; if (!(mvme16x_config & MVME16x_CONFIG_GOT_SCCA)) return (-ENODEV); printk(KERN_INFO "SCC: MVME162 Serial Driver\n"); /* Init channel A */ port = &scc_ports[0]; port->channel = CHANNEL_A; port->ctrlp = (volatile unsigned char *)MVME_SCC_A_ADDR; port->datap = port->ctrlp + 2; port->port_a = &scc_ports[0]; port->port_b = &scc_ports[1]; request_irq(MVME162_IRQ_SCCA_TX, scc_tx_int, SA_INTERRUPT, "SCC-A TX", port); request_irq(MVME162_IRQ_SCCA_STAT, scc_stat_int, SA_INTERRUPT, "SCC-A status", port); request_irq(MVME162_IRQ_SCCA_RX, scc_rx_int, SA_INTERRUPT, "SCC-A RX", port); request_irq(MVME162_IRQ_SCCA_SPCOND, scc_spcond_int, SA_INTERRUPT, "SCC-A special cond", port); { SCC_ACCESS_INIT(port); /* disable interrupts for this channel */ SCCwrite(INT_AND_DMA_REG, 0); /* Set the interrupt vector */ SCCwrite(INT_VECTOR_REG, MVME162_IRQ_SCC_BASE); /* Interrupt parameters: vector includes status, status low */ SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT); SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB); } /* Init channel B */ port = &scc_ports[1]; port->channel = CHANNEL_B; port->ctrlp = (volatile unsigned char *)MVME_SCC_B_ADDR; port->datap = port->ctrlp + 2; port->port_a = &scc_ports[0]; port->port_b = &scc_ports[1]; request_irq(MVME162_IRQ_SCCB_TX, scc_tx_int, SA_INTERRUPT, "SCC-B TX", port); request_irq(MVME162_IRQ_SCCB_STAT, scc_stat_int, SA_INTERRUPT, "SCC-B status", port); request_irq(MVME162_IRQ_SCCB_RX, scc_rx_int, SA_INTERRUPT, "SCC-B RX", port); request_irq(MVME162_IRQ_SCCB_SPCOND, scc_spcond_int, SA_INTERRUPT, "SCC-B special cond", port); { SCC_ACCESS_INIT(port); /* Either channel will do */ /* disable interrupts for this channel */ SCCwrite(INT_AND_DMA_REG, 0); } /* Ensure interrupts are enabled in the MC2 chip */ *(volatile char *)0xfff4201d = 0x14; /* Initialise the tty driver structures and register */ scc_init_portstructs(); scc_init_drivers(); return 0; } #endif #ifdef CONFIG_BVME6000_SCC static int bvme6000_scc_init(void) { struct scc_port *port; printk(KERN_INFO "SCC: BVME6000 Serial Driver\n"); /* Init channel A */ port = &scc_ports[0]; port->channel = CHANNEL_A; port->ctrlp = (volatile unsigned char *)BVME_SCC_A_ADDR; port->datap = port->ctrlp + 4; port->port_a = &scc_ports[0]; port->port_b = &scc_ports[1]; request_irq(BVME_IRQ_SCCA_TX, scc_tx_int, SA_INTERRUPT, "SCC-A TX", port); request_irq(BVME_IRQ_SCCA_STAT, scc_stat_int, SA_INTERRUPT, "SCC-A status", port); request_irq(BVME_IRQ_SCCA_RX, scc_rx_int, SA_INTERRUPT, "SCC-A RX", port); request_irq(BVME_IRQ_SCCA_SPCOND, scc_spcond_int, SA_INTERRUPT, "SCC-A special cond", port); { SCC_ACCESS_INIT(port); /* disable interrupts for this channel */ SCCwrite(INT_AND_DMA_REG, 0); /* Set the interrupt vector */ SCCwrite(INT_VECTOR_REG, BVME_IRQ_SCC_BASE); /* Interrupt parameters: vector includes status, status low */ SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT); SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB); } /* Init channel B */ port = &scc_ports[1]; port->channel = CHANNEL_B; port->ctrlp = (volatile unsigned char *)BVME_SCC_B_ADDR; port->datap = port->ctrlp + 4; port->port_a = &scc_ports[0]; port->port_b = &scc_ports[1]; request_irq(BVME_IRQ_SCCB_TX, scc_tx_int, SA_INTERRUPT, "SCC-B TX", port); request_irq(BVME_IRQ_SCCB_STAT, scc_stat_int, SA_INTERRUPT, "SCC-B status", port); request_irq(BVME_IRQ_SCCB_RX, scc_rx_int, SA_INTERRUPT, "SCC-B RX", port); request_irq(BVME_IRQ_SCCB_SPCOND, scc_spcond_int, SA_INTERRUPT, "SCC-B special cond", port); { SCC_ACCESS_INIT(port); /* Either channel will do */ /* disable interrupts for this channel */ SCCwrite(INT_AND_DMA_REG, 0); } /* Initialise the tty driver structures and register */ scc_init_portstructs(); scc_init_drivers(); return 0; } #endif static int vme_scc_init(void) { int res = -ENODEV; #ifdef CONFIG_MVME147_SCC if (MACH_IS_MVME147) res = mvme147_scc_init(); #endif #ifdef CONFIG_MVME162_SCC if (MACH_IS_MVME16x) res = mvme162_scc_init(); #endif #ifdef CONFIG_BVME6000_SCC if (MACH_IS_BVME6000) res = bvme6000_scc_init(); #endif return res; } module_init(vme_scc_init); /*--------------------------------------------------------------------------- * Interrupt handlers *--------------------------------------------------------------------------*/ static irqreturn_t scc_rx_int(int irq, void *data, struct pt_regs *fp) { unsigned char ch; struct scc_port *port = data; struct tty_struct *tty = port->gs.tty; SCC_ACCESS_INIT(port); ch = SCCread_NB(RX_DATA_REG); if (!tty) { printk(KERN_WARNING "scc_rx_int with NULL tty!\n"); SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); return IRQ_HANDLED; } tty_insert_flip_char(tty, ch, 0); /* Check if another character is already ready; in that case, the * spcond_int() function must be used, because this character may have an * error condition that isn't signalled by the interrupt vector used! */ if (SCCread(INT_PENDING_REG) & (port->channel == CHANNEL_A ? IPR_A_RX : IPR_B_RX)) { scc_spcond_int (irq, data, fp); return IRQ_HANDLED; } SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); tty_flip_buffer_push(tty); return IRQ_HANDLED; } static irqreturn_t scc_spcond_int(int irq, void *data, struct pt_regs *fp) { struct scc_port *port = data; struct tty_struct *tty = port->gs.tty; unsigned char stat, ch, err; int int_pending_mask = port->channel == CHANNEL_A ? IPR_A_RX : IPR_B_RX; SCC_ACCESS_INIT(port); if (!tty) { printk(KERN_WARNING "scc_spcond_int with NULL tty!\n"); SCCwrite(COMMAND_REG, CR_ERROR_RESET); SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); return IRQ_HANDLED; } do { stat = SCCread(SPCOND_STATUS_REG); ch = SCCread_NB(RX_DATA_REG); if (stat & SCSR_RX_OVERRUN) err = TTY_OVERRUN; else if (stat & SCSR_PARITY_ERR) err = TTY_PARITY; else if (stat & SCSR_CRC_FRAME_ERR) err = TTY_FRAME; else err = 0; tty_insert_flip_char(tty, ch, err); /* ++TeSche: *All* errors have to be cleared manually, * else the condition persists for the next chars */ if (err) SCCwrite(COMMAND_REG, CR_ERROR_RESET); } while(SCCread(INT_PENDING_REG) & int_pending_mask); SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); tty_flip_buffer_push(tty); return IRQ_HANDLED; } static irqreturn_t scc_tx_int(int irq, void *data, struct pt_regs *fp) { struct scc_port *port = data; SCC_ACCESS_INIT(port); if (!port->gs.tty) { printk(KERN_WARNING "scc_tx_int with NULL tty!\n"); SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0); SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET); SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); return IRQ_HANDLED; } while ((SCCread_NB(STATUS_REG) & SR_TX_BUF_EMPTY)) { if (port->x_char) { SCCwrite(TX_DATA_REG, port->x_char); port->x_char = 0; } else if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped || port->gs.tty->hw_stopped) break; else { SCCwrite(TX_DATA_REG, port->gs.xmit_buf[port->gs.xmit_tail++]); port->gs.xmit_tail = port->gs.xmit_tail & (SERIAL_XMIT_SIZE-1); if (--port->gs.xmit_cnt <= 0) break; } } if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped || port->gs.tty->hw_stopped) { /* disable tx interrupts */ SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0); SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET); /* disable tx_int on next tx underrun? */ port->gs.flags &= ~GS_TX_INTEN; } if (port->gs.tty && port->gs.xmit_cnt <= port->gs.wakeup_chars) tty_wakeup(port->gs.tty); SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); return IRQ_HANDLED; } static irqreturn_t scc_stat_int(int irq, void *data, struct pt_regs *fp) { struct scc_port *port = data; unsigned channel = port->channel; unsigned char last_sr, sr, changed; SCC_ACCESS_INIT(port); last_sr = scc_last_status_reg[channel]; sr = scc_last_status_reg[channel] = SCCread_NB(STATUS_REG); changed = last_sr ^ sr; if (changed & SR_DCD) { port->c_dcd = !!(sr & SR_DCD); if (!(port->gs.flags & ASYNC_CHECK_CD)) ; /* Don't report DCD changes */ else if (port->c_dcd) { wake_up_interruptible(&port->gs.open_wait); } else { if (port->gs.tty) tty_hangup (port->gs.tty); } } SCCwrite(COMMAND_REG, CR_EXTSTAT_RESET); SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET); return IRQ_HANDLED; } /*--------------------------------------------------------------------------- * generic_serial.c callback funtions *--------------------------------------------------------------------------*/ static void scc_disable_tx_interrupts(void *ptr) { struct scc_port *port = ptr; unsigned long flags; SCC_ACCESS_INIT(port); local_irq_save(flags); SCCmod(INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0); port->gs.flags &= ~GS_TX_INTEN; local_irq_restore(flags); } static void scc_enable_tx_interrupts(void *ptr) { struct scc_port *port = ptr; unsigned long flags; SCC_ACCESS_INIT(port); local_irq_save(flags); SCCmod(INT_AND_DMA_REG, 0xff, IDR_TX_INT_ENAB); /* restart the transmitter */ scc_tx_int (0, port, 0); local_irq_restore(flags); } static void scc_disable_rx_interrupts(void *ptr) { struct scc_port *port = ptr; unsigned long flags; SCC_ACCESS_INIT(port); local_irq_save(flags); SCCmod(INT_AND_DMA_REG, ~(IDR_RX_INT_MASK|IDR_PARERR_AS_SPCOND|IDR_EXTSTAT_INT_ENAB), 0); local_irq_restore(flags); } static void scc_enable_rx_interrupts(void *ptr) { struct scc_port *port = ptr; unsigned long flags; SCC_ACCESS_INIT(port); local_irq_save(flags); SCCmod(INT_AND_DMA_REG, 0xff, IDR_EXTSTAT_INT_ENAB|IDR_PARERR_AS_SPCOND|IDR_RX_INT_ALL); local_irq_restore(flags); } static int scc_get_CD(void *ptr) { struct scc_port *port = ptr; unsigned channel = port->channel; return !!(scc_last_status_reg[channel] & SR_DCD); } static void scc_shutdown_port(void *ptr) { struct scc_port *port = ptr; port->gs.flags &= ~ GS_ACTIVE; if (port->gs.tty && port->gs.tty->termios->c_cflag & HUPCL) { scc_setsignals (port, 0, 0); } } static int scc_set_real_termios (void *ptr) { /* the SCC has char sizes 5,7,6,8 in that order! */ static int chsize_map[4] = { 0, 2, 1, 3 }; unsigned cflag, baud, chsize, channel, brgval = 0; unsigned long flags; struct scc_port *port = ptr; SCC_ACCESS_INIT(port); if (!port->gs.tty || !port->gs.tty->termios) return 0; channel = port->channel; if (channel == CHANNEL_A) return 0; /* Settings controlled by boot PROM */ cflag = port->gs.tty->termios->c_cflag; baud = port->gs.baud; chsize = (cflag & CSIZE) >> 4; if (baud == 0) { /* speed == 0 -> drop DTR */ local_irq_save(flags); SCCmod(TX_CTRL_REG, ~TCR_DTR, 0); local_irq_restore(flags); return 0; } else if ((MACH_IS_MVME16x && (baud < 50 || baud > 38400)) || (MACH_IS_MVME147 && (baud < 50 || baud > 19200)) || (MACH_IS_BVME6000 &&(baud < 50 || baud > 76800))) { printk(KERN_NOTICE "SCC: Bad speed requested, %d\n", baud); return 0; } if (cflag & CLOCAL) port->gs.flags &= ~ASYNC_CHECK_CD; else port->gs.flags |= ASYNC_CHECK_CD; #ifdef CONFIG_MVME147_SCC if (MACH_IS_MVME147) brgval = (M147_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2; #endif #ifdef CONFIG_MVME162_SCC if (MACH_IS_MVME16x) brgval = (MVME_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2; #endif #ifdef CONFIG_BVME6000_SCC if (MACH_IS_BVME6000) brgval = (BVME_SCC_RTxC + baud/2) / (16 * 2 * baud) - 2; #endif /* Now we have all parameters and can go to set them: */ local_irq_save(flags); /* receiver's character size and auto-enables */ SCCmod(RX_CTRL_REG, ~(RCR_CHSIZE_MASK|RCR_AUTO_ENAB_MODE), (chsize_map[chsize] << 6) | ((cflag & CRTSCTS) ? RCR_AUTO_ENAB_MODE : 0)); /* parity and stop bits (both, Tx and Rx), clock mode never changes */ SCCmod (AUX1_CTRL_REG, ~(A1CR_PARITY_MASK | A1CR_MODE_MASK), ((cflag & PARENB ? (cflag & PARODD ? A1CR_PARITY_ODD : A1CR_PARITY_EVEN) : A1CR_PARITY_NONE) | (cflag & CSTOPB ? A1CR_MODE_ASYNC_2 : A1CR_MODE_ASYNC_1))); /* sender's character size, set DTR for valid baud rate */ SCCmod(TX_CTRL_REG, ~TCR_CHSIZE_MASK, chsize_map[chsize] << 5 | TCR_DTR); /* clock sources never change */ /* disable BRG before changing the value */ SCCmod(DPLL_CTRL_REG, ~DCR_BRG_ENAB, 0); /* BRG value */ SCCwrite(TIMER_LOW_REG, brgval & 0xff); SCCwrite(TIMER_HIGH_REG, (brgval >> 8) & 0xff); /* BRG enable, and clock source never changes */ SCCmod(DPLL_CTRL_REG, 0xff, DCR_BRG_ENAB); local_irq_restore(flags); return 0; } static int scc_chars_in_buffer (void *ptr) { struct scc_port *port = ptr; SCC_ACCESS_INIT(port); return (SCCread (SPCOND_STATUS_REG) & SCSR_ALL_SENT) ? 0 : 1; } /* Comment taken from sx.c (2.4.0): 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 scc_hungup(void *ptr) { scc_disable_tx_interrupts(ptr); scc_disable_rx_interrupts(ptr); } static void scc_close(void *ptr) { scc_disable_tx_interrupts(ptr); scc_disable_rx_interrupts(ptr); } /*--------------------------------------------------------------------------- * Internal support functions *--------------------------------------------------------------------------*/ static void scc_setsignals(struct scc_port *port, int dtr, int rts) { unsigned long flags; unsigned char t; SCC_ACCESS_INIT(port); local_irq_save(flags); t = SCCread(TX_CTRL_REG); if (dtr >= 0) t = dtr? (t | TCR_DTR): (t & ~TCR_DTR); if (rts >= 0) t = rts? (t | TCR_RTS): (t & ~TCR_RTS); SCCwrite(TX_CTRL_REG, t); local_irq_restore(flags); } static void scc_send_xchar(struct tty_struct *tty, char ch) { struct scc_port *port = (struct scc_port *)tty->driver_data; port->x_char = ch; if (ch) scc_enable_tx_interrupts(port); } /*--------------------------------------------------------------------------- * Driver entrypoints referenced from above *--------------------------------------------------------------------------*/ static int scc_open (struct tty_struct * tty, struct file * filp) { int line = tty->index; int retval; struct scc_port *port = &scc_ports[line]; int i, channel = port->channel; unsigned long flags; SCC_ACCESS_INIT(port); #if defined(CONFIG_MVME162_SCC) || defined(CONFIG_MVME147_SCC) static const struct { unsigned reg, val; } mvme_init_tab[] = { /* Values for MVME162 and MVME147 */ /* no parity, 1 stop bit, async, 1:16 */ { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 }, /* parity error is special cond, ints disabled, no DMA */ { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB }, /* Rx 8 bits/char, no auto enable, Rx off */ { RX_CTRL_REG, RCR_CHSIZE_8 }, /* DTR off, Tx 8 bits/char, RTS off, Tx off */ { TX_CTRL_REG, TCR_CHSIZE_8 }, /* special features off */ { AUX2_CTRL_REG, 0 }, { CLK_CTRL_REG, CCR_RXCLK_BRG | CCR_TXCLK_BRG }, { DPLL_CTRL_REG, DCR_BRG_ENAB | DCR_BRG_USE_PCLK }, /* Start Rx */ { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 }, /* Start Tx */ { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 }, /* Ext/Stat ints: DCD only */ { INT_CTRL_REG, ICR_ENAB_DCD_INT }, /* Reset Ext/Stat ints */ { COMMAND_REG, CR_EXTSTAT_RESET }, /* ...again */ { COMMAND_REG, CR_EXTSTAT_RESET }, }; #endif #if defined(CONFIG_BVME6000_SCC) static const struct { unsigned reg, val; } bvme_init_tab[] = { /* Values for BVME6000 */ /* no parity, 1 stop bit, async, 1:16 */ { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 }, /* parity error is special cond, ints disabled, no DMA */ { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB }, /* Rx 8 bits/char, no auto enable, Rx off */ { RX_CTRL_REG, RCR_CHSIZE_8 }, /* DTR off, Tx 8 bits/char, RTS off, Tx off */ { TX_CTRL_REG, TCR_CHSIZE_8 }, /* special features off */ { AUX2_CTRL_REG, 0 }, { CLK_CTRL_REG, CCR_RTxC_XTAL | CCR_RXCLK_BRG | CCR_TXCLK_BRG }, { DPLL_CTRL_REG, DCR_BRG_ENAB }, /* Start Rx */ { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 }, /* Start Tx */ { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 }, /* Ext/Stat ints: DCD only */ { INT_CTRL_REG, ICR_ENAB_DCD_INT }, /* Reset Ext/Stat ints */ { COMMAND_REG, CR_EXTSTAT_RESET }, /* ...again */ { COMMAND_REG, CR_EXTSTAT_RESET }, }; #endif if (!(port->gs.flags & ASYNC_INITIALIZED)) { local_irq_save(flags); #if defined(CONFIG_MVME147_SCC) || defined(CONFIG_MVME162_SCC) if (MACH_IS_MVME147 || MACH_IS_MVME16x) { for (i = 0; i < ARRAY_SIZE(mvme_init_tab); ++i) SCCwrite(mvme_init_tab[i].reg, mvme_init_tab[i].val); } #endif #if defined(CONFIG_BVME6000_SCC) if (MACH_IS_BVME6000) { for (i = 0; i < ARRAY_SIZE(bvme_init_tab); ++i) SCCwrite(bvme_init_tab[i].reg, bvme_init_tab[i].val); } #endif /* remember status register for detection of DCD and CTS changes */ scc_last_status_reg[channel] = SCCread(STATUS_REG); port->c_dcd = 0; /* Prevent initial 1->0 interrupt */ scc_setsignals (port, 1,1); local_irq_restore(flags); } tty->driver_data = port; port->gs.tty = tty; port->gs.count++; retval = gs_init_port(&port->gs); if (retval) { port->gs.count--; return retval; } port->gs.flags |= GS_ACTIVE; retval = gs_block_til_ready(port, filp); if (retval) { port->gs.count--; return retval; } port->c_dcd = scc_get_CD (port); scc_enable_rx_interrupts(port); return 0; } static void scc_throttle (struct tty_struct * tty) { struct scc_port *port = (struct scc_port *)tty->driver_data; unsigned long flags; SCC_ACCESS_INIT(port); if (tty->termios->c_cflag & CRTSCTS) { local_irq_save(flags); SCCmod(TX_CTRL_REG, ~TCR_RTS, 0); local_irq_restore(flags); } if (I_IXOFF(tty)) scc_send_xchar(tty, STOP_CHAR(tty)); } static void scc_unthrottle (struct tty_struct * tty) { struct scc_port *port = (struct scc_port *)tty->driver_data; unsigned long flags; SCC_ACCESS_INIT(port); if (tty->termios->c_cflag & CRTSCTS) { local_irq_save(flags); SCCmod(TX_CTRL_REG, 0xff, TCR_RTS); local_irq_restore(flags); } if (I_IXOFF(tty)) scc_send_xchar(tty, START_CHAR(tty)); } static int scc_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) { return -ENOIOCTLCMD; } static void scc_break_ctl(struct tty_struct *tty, int break_state) { struct scc_port *port = (struct scc_port *)tty->driver_data; unsigned long flags; SCC_ACCESS_INIT(port); local_irq_save(flags); SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK, break_state ? TCR_SEND_BREAK : 0); local_irq_restore(flags); } /*--------------------------------------------------------------------------- * Serial console stuff... *--------------------------------------------------------------------------*/ #define scc_delay() do { __asm__ __volatile__ (" nop; nop"); } while (0) static void scc_ch_write (char ch) { volatile char *p = NULL; #ifdef CONFIG_MVME147_SCC if (MACH_IS_MVME147) p = (volatile char *)M147_SCC_A_ADDR; #endif #ifdef CONFIG_MVME162_SCC if (MACH_IS_MVME16x) p = (volatile char *)MVME_SCC_A_ADDR; #endif #ifdef CONFIG_BVME6000_SCC if (MACH_IS_BVME6000) p = (volatile char *)BVME_SCC_A_ADDR; #endif do { scc_delay(); } while (!(*p & 4)); scc_delay(); *p = 8; scc_delay(); *p = ch; } /* The console must be locked when we get here. */ static void scc_console_write (struct console *co, const char *str, unsigned count) { unsigned long flags; local_irq_save(flags); while (count--) { if (*str == '\n') scc_ch_write ('\r'); scc_ch_write (*str++); } local_irq_restore(flags); } static struct tty_driver *scc_console_device(struct console *c, int *index) { *index = c->index; return scc_driver; } static int __init scc_console_setup(struct console *co, char *options) { return 0; } static struct console sercons = { .name = "ttyS", .write = scc_console_write, .device = scc_console_device, .setup = scc_console_setup, .flags = CON_PRINTBUFFER, .index = -1, }; static int __init vme_scc_console_init(void) { if (vme_brdtype == VME_TYPE_MVME147 || vme_brdtype == VME_TYPE_MVME162 || vme_brdtype == VME_TYPE_MVME172 || vme_brdtype == VME_TYPE_BVME4000 || vme_brdtype == VME_TYPE_BVME6000) register_console(&sercons); return 0; } console_initcall(vme_scc_console_init);