diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/staging/dgnc/dgnc_cls.c |
Initial import
Diffstat (limited to 'drivers/staging/dgnc/dgnc_cls.c')
-rw-r--r-- | drivers/staging/dgnc/dgnc_cls.c | 1316 |
1 files changed, 1316 insertions, 0 deletions
diff --git a/drivers/staging/dgnc/dgnc_cls.c b/drivers/staging/dgnc/dgnc_cls.c new file mode 100644 index 000000000..e3564d278 --- /dev/null +++ b/drivers/staging/dgnc/dgnc_cls.c @@ -0,0 +1,1316 @@ +/* + * Copyright 2003 Digi International (www.digi.com) + * Scott H Kilau <Scott_Kilau at digi dot com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the + * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR + * PURPOSE. See the GNU General Public License for more details. + */ + +#include <linux/kernel.h> +#include <linux/sched.h> /* For jiffies, task states */ +#include <linux/interrupt.h> /* For tasklet and interrupt structs/defines */ +#include <linux/delay.h> /* For udelay */ +#include <linux/io.h> /* For read[bwl]/write[bwl] */ +#include <linux/serial.h> /* For struct async_serial */ +#include <linux/serial_reg.h> /* For the various UART offsets */ +#include <linux/pci.h> + +#include "dgnc_driver.h" /* Driver main header file */ +#include "dgnc_cls.h" +#include "dgnc_tty.h" + +static inline void cls_parse_isr(struct dgnc_board *brd, uint port); +static inline void cls_clear_break(struct channel_t *ch, int force); +static inline void cls_set_cts_flow_control(struct channel_t *ch); +static inline void cls_set_rts_flow_control(struct channel_t *ch); +static inline void cls_set_ixon_flow_control(struct channel_t *ch); +static inline void cls_set_ixoff_flow_control(struct channel_t *ch); +static inline void cls_set_no_output_flow_control(struct channel_t *ch); +static inline void cls_set_no_input_flow_control(struct channel_t *ch); +static void cls_parse_modem(struct channel_t *ch, unsigned char signals); +static void cls_tasklet(unsigned long data); +static void cls_vpd(struct dgnc_board *brd); +static void cls_uart_init(struct channel_t *ch); +static void cls_uart_off(struct channel_t *ch); +static int cls_drain(struct tty_struct *tty, uint seconds); +static void cls_param(struct tty_struct *tty); +static void cls_assert_modem_signals(struct channel_t *ch); +static void cls_flush_uart_write(struct channel_t *ch); +static void cls_flush_uart_read(struct channel_t *ch); +static void cls_disable_receiver(struct channel_t *ch); +static void cls_enable_receiver(struct channel_t *ch); +static void cls_send_break(struct channel_t *ch, int msecs); +static void cls_send_start_character(struct channel_t *ch); +static void cls_send_stop_character(struct channel_t *ch); +static void cls_copy_data_from_uart_to_queue(struct channel_t *ch); +static void cls_copy_data_from_queue_to_uart(struct channel_t *ch); +static uint cls_get_uart_bytes_left(struct channel_t *ch); +static void cls_send_immediate_char(struct channel_t *ch, unsigned char); +static irqreturn_t cls_intr(int irq, void *voidbrd); + +struct board_ops dgnc_cls_ops = { + .tasklet = cls_tasklet, + .intr = cls_intr, + .uart_init = cls_uart_init, + .uart_off = cls_uart_off, + .drain = cls_drain, + .param = cls_param, + .vpd = cls_vpd, + .assert_modem_signals = cls_assert_modem_signals, + .flush_uart_write = cls_flush_uart_write, + .flush_uart_read = cls_flush_uart_read, + .disable_receiver = cls_disable_receiver, + .enable_receiver = cls_enable_receiver, + .send_break = cls_send_break, + .send_start_character = cls_send_start_character, + .send_stop_character = cls_send_stop_character, + .copy_data_from_queue_to_uart = cls_copy_data_from_queue_to_uart, + .get_uart_bytes_left = cls_get_uart_bytes_left, + .send_immediate_char = cls_send_immediate_char +}; + +static inline void cls_set_cts_flow_control(struct channel_t *ch) +{ + unsigned char lcrb = readb(&ch->ch_cls_uart->lcr); + unsigned char ier = readb(&ch->ch_cls_uart->ier); + unsigned char isr_fcr = 0; + + /* + * The Enhanced Register Set may only be accessed when + * the Line Control Register is set to 0xBFh. + */ + writeb(UART_EXAR654_ENHANCED_REGISTER_SET, &ch->ch_cls_uart->lcr); + + isr_fcr = readb(&ch->ch_cls_uart->isr_fcr); + + /* Turn on CTS flow control, turn off IXON flow control */ + isr_fcr |= (UART_EXAR654_EFR_ECB | UART_EXAR654_EFR_CTSDSR); + isr_fcr &= ~(UART_EXAR654_EFR_IXON); + + writeb(isr_fcr, &ch->ch_cls_uart->isr_fcr); + + /* Write old LCR value back out, which turns enhanced access off */ + writeb(lcrb, &ch->ch_cls_uart->lcr); + + /* + * Enable interrupts for CTS flow, turn off interrupts for + * received XOFF chars + */ + ier |= (UART_EXAR654_IER_CTSDSR); + ier &= ~(UART_EXAR654_IER_XOFF); + writeb(ier, &ch->ch_cls_uart->ier); + + /* Set the usual FIFO values */ + writeb((UART_FCR_ENABLE_FIFO), &ch->ch_cls_uart->isr_fcr); + + writeb((UART_FCR_ENABLE_FIFO | UART_16654_FCR_RXTRIGGER_56 | + UART_16654_FCR_TXTRIGGER_16 | UART_FCR_CLEAR_RCVR), + &ch->ch_cls_uart->isr_fcr); + + ch->ch_t_tlevel = 16; + +} + +static inline void cls_set_ixon_flow_control(struct channel_t *ch) +{ + unsigned char lcrb = readb(&ch->ch_cls_uart->lcr); + unsigned char ier = readb(&ch->ch_cls_uart->ier); + unsigned char isr_fcr = 0; + + /* + * The Enhanced Register Set may only be accessed when + * the Line Control Register is set to 0xBFh. + */ + writeb(UART_EXAR654_ENHANCED_REGISTER_SET, &ch->ch_cls_uart->lcr); + + isr_fcr = readb(&ch->ch_cls_uart->isr_fcr); + + /* Turn on IXON flow control, turn off CTS flow control */ + isr_fcr |= (UART_EXAR654_EFR_ECB | UART_EXAR654_EFR_IXON); + isr_fcr &= ~(UART_EXAR654_EFR_CTSDSR); + + writeb(isr_fcr, &ch->ch_cls_uart->isr_fcr); + + /* Now set our current start/stop chars while in enhanced mode */ + writeb(ch->ch_startc, &ch->ch_cls_uart->mcr); + writeb(0, &ch->ch_cls_uart->lsr); + writeb(ch->ch_stopc, &ch->ch_cls_uart->msr); + writeb(0, &ch->ch_cls_uart->spr); + + /* Write old LCR value back out, which turns enhanced access off */ + writeb(lcrb, &ch->ch_cls_uart->lcr); + + /* + * Disable interrupts for CTS flow, turn on interrupts for + * received XOFF chars + */ + ier &= ~(UART_EXAR654_IER_CTSDSR); + ier |= (UART_EXAR654_IER_XOFF); + writeb(ier, &ch->ch_cls_uart->ier); + + /* Set the usual FIFO values */ + writeb((UART_FCR_ENABLE_FIFO), &ch->ch_cls_uart->isr_fcr); + + writeb((UART_FCR_ENABLE_FIFO | UART_16654_FCR_RXTRIGGER_16 | + UART_16654_FCR_TXTRIGGER_16 | UART_FCR_CLEAR_RCVR), + &ch->ch_cls_uart->isr_fcr); + +} + +static inline void cls_set_no_output_flow_control(struct channel_t *ch) +{ + unsigned char lcrb = readb(&ch->ch_cls_uart->lcr); + unsigned char ier = readb(&ch->ch_cls_uart->ier); + unsigned char isr_fcr = 0; + + /* + * The Enhanced Register Set may only be accessed when + * the Line Control Register is set to 0xBFh. + */ + writeb(UART_EXAR654_ENHANCED_REGISTER_SET, &ch->ch_cls_uart->lcr); + + isr_fcr = readb(&ch->ch_cls_uart->isr_fcr); + + /* Turn off IXON flow control, turn off CTS flow control */ + isr_fcr |= (UART_EXAR654_EFR_ECB); + isr_fcr &= ~(UART_EXAR654_EFR_CTSDSR | UART_EXAR654_EFR_IXON); + + writeb(isr_fcr, &ch->ch_cls_uart->isr_fcr); + + /* Write old LCR value back out, which turns enhanced access off */ + writeb(lcrb, &ch->ch_cls_uart->lcr); + + /* + * Disable interrupts for CTS flow, turn off interrupts for + * received XOFF chars + */ + ier &= ~(UART_EXAR654_IER_CTSDSR); + ier &= ~(UART_EXAR654_IER_XOFF); + writeb(ier, &ch->ch_cls_uart->ier); + + /* Set the usual FIFO values */ + writeb((UART_FCR_ENABLE_FIFO), &ch->ch_cls_uart->isr_fcr); + + writeb((UART_FCR_ENABLE_FIFO | UART_16654_FCR_RXTRIGGER_16 | + UART_16654_FCR_TXTRIGGER_16 | UART_FCR_CLEAR_RCVR), + &ch->ch_cls_uart->isr_fcr); + + ch->ch_r_watermark = 0; + ch->ch_t_tlevel = 16; + ch->ch_r_tlevel = 16; + +} + +static inline void cls_set_rts_flow_control(struct channel_t *ch) +{ + unsigned char lcrb = readb(&ch->ch_cls_uart->lcr); + unsigned char ier = readb(&ch->ch_cls_uart->ier); + unsigned char isr_fcr = 0; + + /* + * The Enhanced Register Set may only be accessed when + * the Line Control Register is set to 0xBFh. + */ + writeb(UART_EXAR654_ENHANCED_REGISTER_SET, &ch->ch_cls_uart->lcr); + + isr_fcr = readb(&ch->ch_cls_uart->isr_fcr); + + /* Turn on RTS flow control, turn off IXOFF flow control */ + isr_fcr |= (UART_EXAR654_EFR_ECB | UART_EXAR654_EFR_RTSDTR); + isr_fcr &= ~(UART_EXAR654_EFR_IXOFF); + + writeb(isr_fcr, &ch->ch_cls_uart->isr_fcr); + + /* Write old LCR value back out, which turns enhanced access off */ + writeb(lcrb, &ch->ch_cls_uart->lcr); + + /* Enable interrupts for RTS flow */ + ier |= (UART_EXAR654_IER_RTSDTR); + writeb(ier, &ch->ch_cls_uart->ier); + + /* Set the usual FIFO values */ + writeb((UART_FCR_ENABLE_FIFO), &ch->ch_cls_uart->isr_fcr); + + writeb((UART_FCR_ENABLE_FIFO | UART_16654_FCR_RXTRIGGER_56 | + UART_16654_FCR_TXTRIGGER_16 | UART_FCR_CLEAR_RCVR), + &ch->ch_cls_uart->isr_fcr); + + ch->ch_r_watermark = 4; + ch->ch_r_tlevel = 8; + +} + +static inline void cls_set_ixoff_flow_control(struct channel_t *ch) +{ + unsigned char lcrb = readb(&ch->ch_cls_uart->lcr); + unsigned char ier = readb(&ch->ch_cls_uart->ier); + unsigned char isr_fcr = 0; + + /* + * The Enhanced Register Set may only be accessed when + * the Line Control Register is set to 0xBFh. + */ + writeb(UART_EXAR654_ENHANCED_REGISTER_SET, &ch->ch_cls_uart->lcr); + + isr_fcr = readb(&ch->ch_cls_uart->isr_fcr); + + /* Turn on IXOFF flow control, turn off RTS flow control */ + isr_fcr |= (UART_EXAR654_EFR_ECB | UART_EXAR654_EFR_IXOFF); + isr_fcr &= ~(UART_EXAR654_EFR_RTSDTR); + + writeb(isr_fcr, &ch->ch_cls_uart->isr_fcr); + + /* Now set our current start/stop chars while in enhanced mode */ + writeb(ch->ch_startc, &ch->ch_cls_uart->mcr); + writeb(0, &ch->ch_cls_uart->lsr); + writeb(ch->ch_stopc, &ch->ch_cls_uart->msr); + writeb(0, &ch->ch_cls_uart->spr); + + /* Write old LCR value back out, which turns enhanced access off */ + writeb(lcrb, &ch->ch_cls_uart->lcr); + + /* Disable interrupts for RTS flow */ + ier &= ~(UART_EXAR654_IER_RTSDTR); + writeb(ier, &ch->ch_cls_uart->ier); + + /* Set the usual FIFO values */ + writeb((UART_FCR_ENABLE_FIFO), &ch->ch_cls_uart->isr_fcr); + + writeb((UART_FCR_ENABLE_FIFO | UART_16654_FCR_RXTRIGGER_16 | + UART_16654_FCR_TXTRIGGER_16 | UART_FCR_CLEAR_RCVR), + &ch->ch_cls_uart->isr_fcr); + +} + +static inline void cls_set_no_input_flow_control(struct channel_t *ch) +{ + unsigned char lcrb = readb(&ch->ch_cls_uart->lcr); + unsigned char ier = readb(&ch->ch_cls_uart->ier); + unsigned char isr_fcr = 0; + + /* + * The Enhanced Register Set may only be accessed when + * the Line Control Register is set to 0xBFh. + */ + writeb(UART_EXAR654_ENHANCED_REGISTER_SET, &ch->ch_cls_uart->lcr); + + isr_fcr = readb(&ch->ch_cls_uart->isr_fcr); + + /* Turn off IXOFF flow control, turn off RTS flow control */ + isr_fcr |= (UART_EXAR654_EFR_ECB); + isr_fcr &= ~(UART_EXAR654_EFR_RTSDTR | UART_EXAR654_EFR_IXOFF); + + writeb(isr_fcr, &ch->ch_cls_uart->isr_fcr); + + /* Write old LCR value back out, which turns enhanced access off */ + writeb(lcrb, &ch->ch_cls_uart->lcr); + + /* Disable interrupts for RTS flow */ + ier &= ~(UART_EXAR654_IER_RTSDTR); + writeb(ier, &ch->ch_cls_uart->ier); + + /* Set the usual FIFO values */ + writeb((UART_FCR_ENABLE_FIFO), &ch->ch_cls_uart->isr_fcr); + + writeb((UART_FCR_ENABLE_FIFO | UART_16654_FCR_RXTRIGGER_16 | + UART_16654_FCR_TXTRIGGER_16 | UART_FCR_CLEAR_RCVR), + &ch->ch_cls_uart->isr_fcr); + + ch->ch_t_tlevel = 16; + ch->ch_r_tlevel = 16; + +} + +/* + * cls_clear_break. + * Determines whether its time to shut off break condition. + * + * No locks are assumed to be held when calling this function. + * channel lock is held and released in this function. + */ +static inline void cls_clear_break(struct channel_t *ch, int force) +{ + unsigned long flags; + + if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) + return; + + spin_lock_irqsave(&ch->ch_lock, flags); + + /* Bail if we aren't currently sending a break. */ + if (!ch->ch_stop_sending_break) { + spin_unlock_irqrestore(&ch->ch_lock, flags); + return; + } + + /* Turn break off, and unset some variables */ + if (ch->ch_flags & CH_BREAK_SENDING) { + if (time_after(jiffies, ch->ch_stop_sending_break) || force) { + unsigned char temp = readb(&ch->ch_cls_uart->lcr); + + writeb((temp & ~UART_LCR_SBC), &ch->ch_cls_uart->lcr); + ch->ch_flags &= ~(CH_BREAK_SENDING); + ch->ch_stop_sending_break = 0; + } + } + spin_unlock_irqrestore(&ch->ch_lock, flags); +} + +/* Parse the ISR register for the specific port */ +static inline void cls_parse_isr(struct dgnc_board *brd, uint port) +{ + struct channel_t *ch; + unsigned char isr = 0; + unsigned long flags; + + /* + * No need to verify board pointer, it was already + * verified in the interrupt routine. + */ + + if (port >= brd->nasync) + return; + + ch = brd->channels[port]; + if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) + return; + + /* Here we try to figure out what caused the interrupt to happen */ + while (1) { + + isr = readb(&ch->ch_cls_uart->isr_fcr); + + /* Bail if no pending interrupt on port */ + if (isr & UART_IIR_NO_INT) + break; + + /* Receive Interrupt pending */ + if (isr & (UART_IIR_RDI | UART_IIR_RDI_TIMEOUT)) { + /* Read data from uart -> queue */ + brd->intr_rx++; + ch->ch_intr_rx++; + cls_copy_data_from_uart_to_queue(ch); + dgnc_check_queue_flow_control(ch); + } + + /* Transmit Hold register empty pending */ + if (isr & UART_IIR_THRI) { + /* Transfer data (if any) from Write Queue -> UART. */ + spin_lock_irqsave(&ch->ch_lock, flags); + ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); + brd->intr_tx++; + ch->ch_intr_tx++; + spin_unlock_irqrestore(&ch->ch_lock, flags); + cls_copy_data_from_queue_to_uart(ch); + } + + /* CTS/RTS change of state */ + if (isr & UART_IIR_CTSRTS) { + brd->intr_modem++; + ch->ch_intr_modem++; + /* + * Don't need to do anything, the cls_parse_modem + * below will grab the updated modem signals. + */ + } + + /* Parse any modem signal changes */ + cls_parse_modem(ch, readb(&ch->ch_cls_uart->msr)); + } +} + +/* + * cls_param() + * Send any/all changes to the line to the UART. + */ +static void cls_param(struct tty_struct *tty) +{ + unsigned char lcr = 0; + unsigned char uart_lcr = 0; + unsigned char ier = 0; + unsigned char uart_ier = 0; + uint baud = 9600; + int quot = 0; + struct dgnc_board *bd; + struct channel_t *ch; + struct un_t *un; + + if (!tty || tty->magic != TTY_MAGIC) + return; + + un = (struct un_t *) tty->driver_data; + if (!un || un->magic != DGNC_UNIT_MAGIC) + return; + + ch = un->un_ch; + if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) + return; + + bd = ch->ch_bd; + if (!bd || bd->magic != DGNC_BOARD_MAGIC) + return; + + /* + * If baud rate is zero, flush queues, and set mval to drop DTR. + */ + if ((ch->ch_c_cflag & (CBAUD)) == 0) { + ch->ch_r_head = 0; + ch->ch_r_tail = 0; + ch->ch_e_head = 0; + ch->ch_e_tail = 0; + ch->ch_w_head = 0; + ch->ch_w_tail = 0; + + cls_flush_uart_write(ch); + cls_flush_uart_read(ch); + + /* The baudrate is B0 so all modem lines are to be dropped. */ + ch->ch_flags |= (CH_BAUD0); + ch->ch_mostat &= ~(UART_MCR_RTS | UART_MCR_DTR); + cls_assert_modem_signals(ch); + ch->ch_old_baud = 0; + return; + } else if (ch->ch_custom_speed) { + + baud = ch->ch_custom_speed; + /* Handle transition from B0 */ + if (ch->ch_flags & CH_BAUD0) { + ch->ch_flags &= ~(CH_BAUD0); + + /* + * Bring back up RTS and DTR... + * Also handle RTS or DTR toggle if set. + */ + if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)) + ch->ch_mostat |= (UART_MCR_RTS); + if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE)) + ch->ch_mostat |= (UART_MCR_DTR); + } + + } else { + int iindex = 0; + int jindex = 0; + + ulong bauds[4][16] = { + { /* slowbaud */ + 0, 50, 75, 110, + 134, 150, 200, 300, + 600, 1200, 1800, 2400, + 4800, 9600, 19200, 38400 }, + { /* slowbaud & CBAUDEX */ + 0, 57600, 115200, 230400, + 460800, 150, 200, 921600, + 600, 1200, 1800, 2400, + 4800, 9600, 19200, 38400 }, + { /* fastbaud */ + 0, 57600, 76800, 115200, + 131657, 153600, 230400, 460800, + 921600, 1200, 1800, 2400, + 4800, 9600, 19200, 38400 }, + { /* fastbaud & CBAUDEX */ + 0, 57600, 115200, 230400, + 460800, 150, 200, 921600, + 600, 1200, 1800, 2400, + 4800, 9600, 19200, 38400 } + }; + + /* + * Only use the TXPrint baud rate if the terminal + * unit is NOT open + */ + if (!(ch->ch_tun.un_flags & UN_ISOPEN) && + (un->un_type == DGNC_PRINT)) + baud = C_BAUD(ch->ch_pun.un_tty) & 0xff; + else + baud = C_BAUD(ch->ch_tun.un_tty) & 0xff; + + if (ch->ch_c_cflag & CBAUDEX) + iindex = 1; + + if (ch->ch_digi.digi_flags & DIGI_FAST) + iindex += 2; + + jindex = baud; + + if ((iindex >= 0) && (iindex < 4) && (jindex >= 0) && + (jindex < 16)) { + baud = bauds[iindex][jindex]; + } else { + baud = 0; + } + + if (baud == 0) + baud = 9600; + + /* Handle transition from B0 */ + if (ch->ch_flags & CH_BAUD0) { + ch->ch_flags &= ~(CH_BAUD0); + + /* + * Bring back up RTS and DTR... + * Also handle RTS or DTR toggle if set. + */ + if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)) + ch->ch_mostat |= (UART_MCR_RTS); + if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE)) + ch->ch_mostat |= (UART_MCR_DTR); + } + } + + if (ch->ch_c_cflag & PARENB) + lcr |= UART_LCR_PARITY; + + if (!(ch->ch_c_cflag & PARODD)) + lcr |= UART_LCR_EPAR; + + /* + * Not all platforms support mark/space parity, + * so this will hide behind an ifdef. + */ +#ifdef CMSPAR + if (ch->ch_c_cflag & CMSPAR) + lcr |= UART_LCR_SPAR; +#endif + + if (ch->ch_c_cflag & CSTOPB) + lcr |= UART_LCR_STOP; + + switch (ch->ch_c_cflag & CSIZE) { + case CS5: + lcr |= UART_LCR_WLEN5; + break; + case CS6: + lcr |= UART_LCR_WLEN6; + break; + case CS7: + lcr |= UART_LCR_WLEN7; + break; + case CS8: + default: + lcr |= UART_LCR_WLEN8; + break; + } + + uart_ier = readb(&ch->ch_cls_uart->ier); + ier = uart_ier; + uart_lcr = readb(&ch->ch_cls_uart->lcr); + + if (baud == 0) + baud = 9600; + + quot = ch->ch_bd->bd_dividend / baud; + + if (quot != 0 && ch->ch_old_baud != baud) { + ch->ch_old_baud = baud; + writeb(UART_LCR_DLAB, &ch->ch_cls_uart->lcr); + writeb((quot & 0xff), &ch->ch_cls_uart->txrx); + writeb((quot >> 8), &ch->ch_cls_uart->ier); + writeb(lcr, &ch->ch_cls_uart->lcr); + } + + if (uart_lcr != lcr) + writeb(lcr, &ch->ch_cls_uart->lcr); + + if (ch->ch_c_cflag & CREAD) + ier |= (UART_IER_RDI | UART_IER_RLSI); + else + ier &= ~(UART_IER_RDI | UART_IER_RLSI); + + /* + * Have the UART interrupt on modem signal changes ONLY when + * we are in hardware flow control mode, or CLOCAL/FORCEDCD is not set. + */ + if ((ch->ch_digi.digi_flags & CTSPACE) || + (ch->ch_digi.digi_flags & RTSPACE) || + (ch->ch_c_cflag & CRTSCTS) || + !(ch->ch_digi.digi_flags & DIGI_FORCEDCD) || + !(ch->ch_c_cflag & CLOCAL)) + ier |= UART_IER_MSI; + else + ier &= ~UART_IER_MSI; + + ier |= UART_IER_THRI; + + if (ier != uart_ier) + writeb(ier, &ch->ch_cls_uart->ier); + + if (ch->ch_digi.digi_flags & CTSPACE || ch->ch_c_cflag & CRTSCTS) { + cls_set_cts_flow_control(ch); + } else if (ch->ch_c_iflag & IXON) { + /* + * If start/stop is set to disable, then we should + * disable flow control + */ + if ((ch->ch_startc == _POSIX_VDISABLE) || + (ch->ch_stopc == _POSIX_VDISABLE)) + cls_set_no_output_flow_control(ch); + else + cls_set_ixon_flow_control(ch); + } else { + cls_set_no_output_flow_control(ch); + } + + if (ch->ch_digi.digi_flags & RTSPACE || ch->ch_c_cflag & CRTSCTS) { + cls_set_rts_flow_control(ch); + } else if (ch->ch_c_iflag & IXOFF) { + /* + * If start/stop is set to disable, then we should disable + * flow control + */ + if ((ch->ch_startc == _POSIX_VDISABLE) || + (ch->ch_stopc == _POSIX_VDISABLE)) + cls_set_no_input_flow_control(ch); + else + cls_set_ixoff_flow_control(ch); + } else { + cls_set_no_input_flow_control(ch); + } + + cls_assert_modem_signals(ch); + + /* Get current status of the modem signals now */ + cls_parse_modem(ch, readb(&ch->ch_cls_uart->msr)); +} + +/* + * Our board poller function. + */ +static void cls_tasklet(unsigned long data) +{ + struct dgnc_board *bd = (struct dgnc_board *) data; + struct channel_t *ch; + unsigned long flags; + int i; + int state = 0; + int ports = 0; + + if (!bd || bd->magic != DGNC_BOARD_MAGIC) + return; + + /* Cache a couple board values */ + spin_lock_irqsave(&bd->bd_lock, flags); + state = bd->state; + ports = bd->nasync; + spin_unlock_irqrestore(&bd->bd_lock, flags); + + /* + * Do NOT allow the interrupt routine to read the intr registers + * Until we release this lock. + */ + spin_lock_irqsave(&bd->bd_intr_lock, flags); + + /* + * If board is ready, parse deeper to see if there is anything to do. + */ + if ((state == BOARD_READY) && (ports > 0)) { + + /* Loop on each port */ + for (i = 0; i < ports; i++) { + ch = bd->channels[i]; + if (!ch) + continue; + + /* + * NOTE: Remember you CANNOT hold any channel + * locks when calling input. + * During input processing, its possible we + * will call ld, which might do callbacks back + * into us. + */ + dgnc_input(ch); + + /* + * Channel lock is grabbed and then released + * inside this routine. + */ + cls_copy_data_from_queue_to_uart(ch); + dgnc_wakeup_writes(ch); + + /* + * Check carrier function. + */ + dgnc_carrier(ch); + + /* + * The timing check of turning off the break is done + * inside clear_break() + */ + if (ch->ch_stop_sending_break) + cls_clear_break(ch, 0); + } + } + + spin_unlock_irqrestore(&bd->bd_intr_lock, flags); + +} + +/* + * cls_intr() + * + * Classic specific interrupt handler. + */ +static irqreturn_t cls_intr(int irq, void *voidbrd) +{ + struct dgnc_board *brd = voidbrd; + uint i = 0; + unsigned char poll_reg; + unsigned long flags; + + /* + * Check to make sure it didn't receive interrupt with a null board + * associated or a board pointer that wasn't ours. + */ + if (!brd || brd->magic != DGNC_BOARD_MAGIC) + return IRQ_NONE; + + spin_lock_irqsave(&brd->bd_intr_lock, flags); + + brd->intr_count++; + + /* + * Check the board's global interrupt offset to see if we + * we actually do have an interrupt pending for us. + */ + poll_reg = readb(brd->re_map_membase + UART_CLASSIC_POLL_ADDR_OFFSET); + + /* If 0, no interrupts pending */ + if (!poll_reg) { + spin_unlock_irqrestore(&brd->bd_intr_lock, flags); + return IRQ_NONE; + } + + /* Parse each port to find out what caused the interrupt */ + for (i = 0; i < brd->nasync; i++) + cls_parse_isr(brd, i); + + /* + * Schedule tasklet to more in-depth servicing at a better time. + */ + tasklet_schedule(&brd->helper_tasklet); + + spin_unlock_irqrestore(&brd->bd_intr_lock, flags); + + return IRQ_HANDLED; +} + +static void cls_disable_receiver(struct channel_t *ch) +{ + unsigned char tmp = readb(&ch->ch_cls_uart->ier); + + tmp &= ~(UART_IER_RDI); + writeb(tmp, &ch->ch_cls_uart->ier); +} + +static void cls_enable_receiver(struct channel_t *ch) +{ + unsigned char tmp = readb(&ch->ch_cls_uart->ier); + + tmp |= (UART_IER_RDI); + writeb(tmp, &ch->ch_cls_uart->ier); +} + +static void cls_copy_data_from_uart_to_queue(struct channel_t *ch) +{ + int qleft = 0; + unsigned char linestatus = 0; + unsigned char error_mask = 0; + ushort head; + ushort tail; + unsigned long flags; + + if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) + return; + + spin_lock_irqsave(&ch->ch_lock, flags); + + /* cache head and tail of queue */ + head = ch->ch_r_head; + tail = ch->ch_r_tail; + + /* Store how much space we have left in the queue */ + qleft = (tail - head - 1); + if (qleft < 0) + qleft += RQUEUEMASK + 1; + + /* + * Create a mask to determine whether we should + * insert the character (if any) into our queue. + */ + if (ch->ch_c_iflag & IGNBRK) + error_mask |= UART_LSR_BI; + + while (1) { + linestatus = readb(&ch->ch_cls_uart->lsr); + + if (!(linestatus & (UART_LSR_DR))) + break; + + /* + * Discard character if we are ignoring the error mask. + */ + if (linestatus & error_mask) { + unsigned char discard; + + linestatus = 0; + discard = readb(&ch->ch_cls_uart->txrx); + continue; + } + + /* + * If our queue is full, we have no choice but to drop some + * data. The assumption is that HWFLOW or SWFLOW should have + * stopped things way way before we got to this point. + * + * I decided that I wanted to ditch the oldest data first, + * I hope thats okay with everyone? Yes? Good. + */ + while (qleft < 1) { + tail = (tail + 1) & RQUEUEMASK; + ch->ch_r_tail = tail; + ch->ch_err_overrun++; + qleft++; + } + + ch->ch_equeue[head] = linestatus & (UART_LSR_BI | UART_LSR_PE + | UART_LSR_FE); + ch->ch_rqueue[head] = readb(&ch->ch_cls_uart->txrx); + + qleft--; + + if (ch->ch_equeue[head] & UART_LSR_PE) + ch->ch_err_parity++; + if (ch->ch_equeue[head] & UART_LSR_BI) + ch->ch_err_break++; + if (ch->ch_equeue[head] & UART_LSR_FE) + ch->ch_err_frame++; + + /* Add to, and flip head if needed */ + head = (head + 1) & RQUEUEMASK; + ch->ch_rxcount++; + } + + /* + * Write new final heads to channel structure. + */ + ch->ch_r_head = head & RQUEUEMASK; + ch->ch_e_head = head & EQUEUEMASK; + + spin_unlock_irqrestore(&ch->ch_lock, flags); +} + +/* + * This function basically goes to sleep for secs, or until + * it gets signalled that the port has fully drained. + */ +static int cls_drain(struct tty_struct *tty, uint seconds) +{ + unsigned long flags; + struct channel_t *ch; + struct un_t *un; + + if (!tty || tty->magic != TTY_MAGIC) + return -ENXIO; + + un = (struct un_t *) tty->driver_data; + if (!un || un->magic != DGNC_UNIT_MAGIC) + return -ENXIO; + + ch = un->un_ch; + if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) + return -ENXIO; + + spin_lock_irqsave(&ch->ch_lock, flags); + un->un_flags |= UN_EMPTY; + spin_unlock_irqrestore(&ch->ch_lock, flags); + + /* + * NOTE: Do something with time passed in. + */ + + /* If ret is non-zero, user ctrl-c'ed us */ + + return wait_event_interruptible(un->un_flags_wait, + ((un->un_flags & UN_EMPTY) == 0)); +} + +/* Channel lock MUST be held before calling this function! */ +static void cls_flush_uart_write(struct channel_t *ch) +{ + if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) + return; + + writeb((UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_XMIT), + &ch->ch_cls_uart->isr_fcr); + udelay(10); + + ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); +} + +/* Channel lock MUST be held before calling this function! */ +static void cls_flush_uart_read(struct channel_t *ch) +{ + if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) + return; + + /* + * For complete POSIX compatibility, we should be purging the + * read FIFO in the UART here. + * + * However, clearing the read FIFO (UART_FCR_CLEAR_RCVR) also + * incorrectly flushes write data as well as just basically trashing the + * FIFO. + * + * Presumably, this is a bug in this UART. + */ + + udelay(10); +} + +static void cls_copy_data_from_queue_to_uart(struct channel_t *ch) +{ + ushort head; + ushort tail; + int n; + int qlen; + uint len_written = 0; + unsigned long flags; + + if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) + return; + + spin_lock_irqsave(&ch->ch_lock, flags); + + /* No data to write to the UART */ + if (ch->ch_w_tail == ch->ch_w_head) + goto exit_unlock; + + /* If port is "stopped", don't send any data to the UART */ + if ((ch->ch_flags & CH_FORCED_STOP) || + (ch->ch_flags & CH_BREAK_SENDING)) + goto exit_unlock; + + if (!(ch->ch_flags & (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM))) + goto exit_unlock; + + n = 32; + + /* cache head and tail of queue */ + head = ch->ch_w_head & WQUEUEMASK; + tail = ch->ch_w_tail & WQUEUEMASK; + qlen = (head - tail) & WQUEUEMASK; + + /* Find minimum of the FIFO space, versus queue length */ + n = min(n, qlen); + + while (n > 0) { + + /* + * If RTS Toggle mode is on, turn on RTS now if not already set, + * and make sure we get an event when the data transfer has + * completed. + */ + if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) { + if (!(ch->ch_mostat & UART_MCR_RTS)) { + ch->ch_mostat |= (UART_MCR_RTS); + cls_assert_modem_signals(ch); + } + ch->ch_tun.un_flags |= (UN_EMPTY); + } + + /* + * If DTR Toggle mode is on, turn on DTR now if not already set, + * and make sure we get an event when the data transfer has + * completed. + */ + if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) { + if (!(ch->ch_mostat & UART_MCR_DTR)) { + ch->ch_mostat |= (UART_MCR_DTR); + cls_assert_modem_signals(ch); + } + ch->ch_tun.un_flags |= (UN_EMPTY); + } + writeb(ch->ch_wqueue[ch->ch_w_tail], &ch->ch_cls_uart->txrx); + ch->ch_w_tail++; + ch->ch_w_tail &= WQUEUEMASK; + ch->ch_txcount++; + len_written++; + n--; + } + + if (len_written > 0) + ch->ch_flags &= ~(CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); + +exit_unlock: + spin_unlock_irqrestore(&ch->ch_lock, flags); +} + +static void cls_parse_modem(struct channel_t *ch, unsigned char signals) +{ + unsigned char msignals = signals; + unsigned long flags; + + if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) + return; + + /* + * Do altpin switching. Altpin switches DCD and DSR. + * This prolly breaks DSRPACE, so we should be more clever here. + */ + spin_lock_irqsave(&ch->ch_lock, flags); + if (ch->ch_digi.digi_flags & DIGI_ALTPIN) { + unsigned char mswap = signals; + + if (mswap & UART_MSR_DDCD) { + msignals &= ~UART_MSR_DDCD; + msignals |= UART_MSR_DDSR; + } + if (mswap & UART_MSR_DDSR) { + msignals &= ~UART_MSR_DDSR; + msignals |= UART_MSR_DDCD; + } + if (mswap & UART_MSR_DCD) { + msignals &= ~UART_MSR_DCD; + msignals |= UART_MSR_DSR; + } + if (mswap & UART_MSR_DSR) { + msignals &= ~UART_MSR_DSR; + msignals |= UART_MSR_DCD; + } + } + spin_unlock_irqrestore(&ch->ch_lock, flags); + + /* + * Scrub off lower bits. They signify delta's, which I don't + * care about + */ + signals &= 0xf0; + + spin_lock_irqsave(&ch->ch_lock, flags); + if (msignals & UART_MSR_DCD) + ch->ch_mistat |= UART_MSR_DCD; + else + ch->ch_mistat &= ~UART_MSR_DCD; + + if (msignals & UART_MSR_DSR) + ch->ch_mistat |= UART_MSR_DSR; + else + ch->ch_mistat &= ~UART_MSR_DSR; + + if (msignals & UART_MSR_RI) + ch->ch_mistat |= UART_MSR_RI; + else + ch->ch_mistat &= ~UART_MSR_RI; + + if (msignals & UART_MSR_CTS) + ch->ch_mistat |= UART_MSR_CTS; + else + ch->ch_mistat &= ~UART_MSR_CTS; + spin_unlock_irqrestore(&ch->ch_lock, flags); +} + +/* Make the UART raise any of the output signals we want up */ +static void cls_assert_modem_signals(struct channel_t *ch) +{ + unsigned char out; + + if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) + return; + + out = ch->ch_mostat; + + if (ch->ch_flags & CH_LOOPBACK) + out |= UART_MCR_LOOP; + + writeb(out, &ch->ch_cls_uart->mcr); + + /* Give time for the UART to actually drop the signals */ + udelay(10); +} + +static void cls_send_start_character(struct channel_t *ch) +{ + if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) + return; + + if (ch->ch_startc != _POSIX_VDISABLE) { + ch->ch_xon_sends++; + writeb(ch->ch_startc, &ch->ch_cls_uart->txrx); + } +} + +static void cls_send_stop_character(struct channel_t *ch) +{ + if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) + return; + + if (ch->ch_stopc != _POSIX_VDISABLE) { + ch->ch_xoff_sends++; + writeb(ch->ch_stopc, &ch->ch_cls_uart->txrx); + } +} + +/* Inits UART */ +static void cls_uart_init(struct channel_t *ch) +{ + unsigned char lcrb = readb(&ch->ch_cls_uart->lcr); + unsigned char isr_fcr = 0; + + writeb(0, &ch->ch_cls_uart->ier); + + /* + * The Enhanced Register Set may only be accessed when + * the Line Control Register is set to 0xBFh. + */ + writeb(UART_EXAR654_ENHANCED_REGISTER_SET, &ch->ch_cls_uart->lcr); + + isr_fcr = readb(&ch->ch_cls_uart->isr_fcr); + + /* Turn on Enhanced/Extended controls */ + isr_fcr |= (UART_EXAR654_EFR_ECB); + + writeb(isr_fcr, &ch->ch_cls_uart->isr_fcr); + + /* Write old LCR value back out, which turns enhanced access off */ + writeb(lcrb, &ch->ch_cls_uart->lcr); + + /* Clear out UART and FIFO */ + readb(&ch->ch_cls_uart->txrx); + + writeb((UART_FCR_ENABLE_FIFO|UART_FCR_CLEAR_RCVR|UART_FCR_CLEAR_XMIT), + &ch->ch_cls_uart->isr_fcr); + udelay(10); + + ch->ch_flags |= (CH_FIFO_ENABLED | CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); + + readb(&ch->ch_cls_uart->lsr); + readb(&ch->ch_cls_uart->msr); +} + +/* + * Turns off UART. + */ +static void cls_uart_off(struct channel_t *ch) +{ + writeb(0, &ch->ch_cls_uart->ier); +} + +/* + * cls_get_uarts_bytes_left. + * Returns 0 is nothing left in the FIFO, returns 1 otherwise. + * + * The channel lock MUST be held by the calling function. + */ +static uint cls_get_uart_bytes_left(struct channel_t *ch) +{ + unsigned char left = 0; + unsigned char lsr = 0; + + if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) + return 0; + + lsr = readb(&ch->ch_cls_uart->lsr); + + /* Determine whether the Transmitter is empty or not */ + if (!(lsr & UART_LSR_TEMT)) { + if (ch->ch_flags & CH_TX_FIFO_EMPTY) + tasklet_schedule(&ch->ch_bd->helper_tasklet); + left = 1; + } else { + ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM); + left = 0; + } + + return left; +} + +/* + * cls_send_break. + * Starts sending a break thru the UART. + * + * The channel lock MUST be held by the calling function. + */ +static void cls_send_break(struct channel_t *ch, int msecs) +{ + if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) + return; + + /* + * If we receive a time of 0, this means turn off the break. + */ + if (msecs == 0) { + /* Turn break off, and unset some variables */ + if (ch->ch_flags & CH_BREAK_SENDING) { + unsigned char temp = readb(&ch->ch_cls_uart->lcr); + + writeb((temp & ~UART_LCR_SBC), &ch->ch_cls_uart->lcr); + ch->ch_flags &= ~(CH_BREAK_SENDING); + ch->ch_stop_sending_break = 0; + } + return; + } + + /* + * Set the time we should stop sending the break. + * If we are already sending a break, toss away the existing + * time to stop, and use this new value instead. + */ + ch->ch_stop_sending_break = jiffies + dgnc_jiffies_from_ms(msecs); + + /* Tell the UART to start sending the break */ + if (!(ch->ch_flags & CH_BREAK_SENDING)) { + unsigned char temp = readb(&ch->ch_cls_uart->lcr); + + writeb((temp | UART_LCR_SBC), &ch->ch_cls_uart->lcr); + ch->ch_flags |= (CH_BREAK_SENDING); + } +} + +/* + * cls_send_immediate_char. + * Sends a specific character as soon as possible to the UART, + * jumping over any bytes that might be in the write queue. + * + * The channel lock MUST be held by the calling function. + */ +static void cls_send_immediate_char(struct channel_t *ch, unsigned char c) +{ + if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) + return; + + writeb(c, &ch->ch_cls_uart->txrx); +} + +static void cls_vpd(struct dgnc_board *brd) +{ + ulong vpdbase; /* Start of io base of the card */ + u8 __iomem *re_map_vpdbase;/* Remapped memory of the card */ + int i = 0; + + vpdbase = pci_resource_start(brd->pdev, 3); + + /* No VPD */ + if (!vpdbase) + return; + + re_map_vpdbase = ioremap(vpdbase, 0x400); + + if (!re_map_vpdbase) + return; + + /* Store the VPD into our buffer */ + for (i = 0; i < 0x40; i++) { + brd->vpd[i] = readb(re_map_vpdbase + i); + pr_info("%x ", brd->vpd[i]); + } + pr_info("\n"); + + if (re_map_vpdbase) + iounmap(re_map_vpdbase); +} |