diff options
Diffstat (limited to 'drivers/staging/net/pc300_tty.c')
| -rw-r--r-- | drivers/staging/net/pc300_tty.c | 1079 |
1 files changed, 1079 insertions, 0 deletions
diff --git a/drivers/staging/net/pc300_tty.c b/drivers/staging/net/pc300_tty.c new file mode 100644 index 000000000000..4709f4228561 --- /dev/null +++ b/drivers/staging/net/pc300_tty.c @@ -0,0 +1,1079 @@ +/* + * pc300_tty.c Cyclades-PC300(tm) TTY Driver. + * + * Author: Regina Kodato <reginak@cyclades.com> + * + * Copyright: (c) 1999-2002 Cyclades Corp. + * + * 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 of the License, or (at your option) any later version. + * + * $Log: pc300_tty.c,v $ + * Revision 3.7 2002/03/07 14:17:09 henrique + * License data fixed + * + * Revision 3.6 2001/12/10 12:29:42 regina + * Fix the MLPPP bug + * + * Revision 3.5 2001/10/31 11:20:05 regina + * automatic pppd starts + * + * Revision 3.4 2001/08/06 12:01:51 regina + * problem in DSR_DE bit + * + * Revision 3.3 2001/07/26 22:58:41 regina + * update EDA value + * + * Revision 3.2 2001/07/12 13:11:20 regina + * bug fix - DCD-OFF in pc300 tty driver + * + * DMA transmission bug fix + * + * Revision 3.1 2001/06/22 13:13:02 regina + * MLPPP implementation + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/netdevice.h> +#include <linux/spinlock.h> +#include <linux/slab.h> +#include <linux/if.h> +#include <linux/skbuff.h> +/* TTY includes */ +#include <linux/tty.h> +#include <linux/tty_flip.h> +#include <linux/serial.h> + +#include <asm/io.h> +#include <asm/uaccess.h> + +#include "pc300.h" + +/* defines and macros */ +/* TTY Global definitions */ +#define CPC_TTY_NPORTS 8 /* maximum number of the sync tty connections */ +#define CPC_TTY_MAJOR CYCLADES_MAJOR +#define CPC_TTY_MINOR_START 240 /* minor of the first PC300 interface */ + +#define CPC_TTY_MAX_MTU 2000 + +/* tty interface state */ +#define CPC_TTY_ST_IDLE 0 +#define CPC_TTY_ST_INIT 1 /* configured with MLPPP and up */ +#define CPC_TTY_ST_OPEN 2 /* opened by application */ + +#define CPC_TTY_LOCK(card,flags)\ + do {\ + spin_lock_irqsave(&card->card_lock, flags); \ + } while (0) + +#define CPC_TTY_UNLOCK(card,flags) \ + do {\ + spin_unlock_irqrestore(&card->card_lock, flags); \ + } while (0) + +//#define CPC_TTY_DBG(format,a...) printk(format,##a) +#define CPC_TTY_DBG(format,a...) + +/* data structures */ +typedef struct _st_cpc_rx_buf { + struct _st_cpc_rx_buf *next; + int size; + unsigned char data[1]; +} st_cpc_rx_buf; + +struct st_cpc_rx_list { + st_cpc_rx_buf *first; + st_cpc_rx_buf *last; +}; + +typedef struct _st_cpc_tty_area { + int state; /* state of the TTY interface */ + int num_open; + unsigned int tty_minor; /* minor this interface */ + volatile struct st_cpc_rx_list buf_rx; /* ptr. to reception buffer */ + unsigned char* buf_tx; /* ptr. to transmission buffer */ + pc300dev_t* pc300dev; /* ptr. to info struct in PC300 driver */ + unsigned char name[20]; /* interf. name + "-tty" */ + struct tty_struct *tty; + struct work_struct tty_tx_work; /* tx work - tx interrupt */ + struct work_struct tty_rx_work; /* rx work - rx interrupt */ + } st_cpc_tty_area; + +/* TTY data structures */ +static struct tty_driver serial_drv; + +/* local variables */ +static st_cpc_tty_area cpc_tty_area[CPC_TTY_NPORTS]; + +static int cpc_tty_cnt = 0; /* number of intrfaces configured with MLPPP */ +static int cpc_tty_unreg_flag = 0; + +/* TTY functions prototype */ +static int cpc_tty_open(struct tty_struct *tty, struct file *flip); +static void cpc_tty_close(struct tty_struct *tty, struct file *flip); +static int cpc_tty_write(struct tty_struct *tty, const unsigned char *buf, int count); +static int cpc_tty_write_room(struct tty_struct *tty); +static int cpc_tty_chars_in_buffer(struct tty_struct *tty); +static void cpc_tty_flush_buffer(struct tty_struct *tty); +static void cpc_tty_hangup(struct tty_struct *tty); +static void cpc_tty_rx_work(struct work_struct *work); +static void cpc_tty_tx_work(struct work_struct *work); +static int cpc_tty_send_to_card(pc300dev_t *dev,void *buf, int len); +static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx); +static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char); +static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char); + +static int pc300_tiocmset(struct tty_struct *, unsigned int, unsigned int); +static int pc300_tiocmget(struct tty_struct *); + +/* functions called by PC300 driver */ +void cpc_tty_init(pc300dev_t *dev); +void cpc_tty_unregister_service(pc300dev_t *pc300dev); +void cpc_tty_receive(pc300dev_t *pc300dev); +void cpc_tty_trigger_poll(pc300dev_t *pc300dev); + +/* + * PC300 TTY clear "signal" + */ +static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char signal) +{ + pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan; + pc300_t *card = (pc300_t *) pc300chan->card; + int ch = pc300chan->channel; + unsigned long flags; + + CPC_TTY_DBG("%s-tty: Clear signal %x\n", + pc300dev->dev->name, signal); + CPC_TTY_LOCK(card, flags); + cpc_writeb(card->hw.scabase + M_REG(CTL,ch), + cpc_readb(card->hw.scabase+M_REG(CTL,ch))& signal); + CPC_TTY_UNLOCK(card,flags); +} + +/* + * PC300 TTY set "signal" to ON + */ +static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char signal) +{ + pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan; + pc300_t *card = (pc300_t *) pc300chan->card; + int ch = pc300chan->channel; + unsigned long flags; + + CPC_TTY_DBG("%s-tty: Set signal %x\n", + pc300dev->dev->name, signal); + CPC_TTY_LOCK(card, flags); + cpc_writeb(card->hw.scabase + M_REG(CTL,ch), + cpc_readb(card->hw.scabase+M_REG(CTL,ch))& ~signal); + CPC_TTY_UNLOCK(card,flags); +} + + +static const struct tty_operations pc300_ops = { + .open = cpc_tty_open, + .close = cpc_tty_close, + .write = cpc_tty_write, + .write_room = cpc_tty_write_room, + .chars_in_buffer = cpc_tty_chars_in_buffer, + .tiocmset = pc300_tiocmset, + .tiocmget = pc300_tiocmget, + .flush_buffer = cpc_tty_flush_buffer, + .hangup = cpc_tty_hangup, +}; + + +/* + * PC300 TTY initialization routine + * + * This routine is called by the PC300 driver during board configuration + * (ioctl=SIOCSP300CONF). At this point the adapter is completely + * initialized. + * o verify kernel version (only 2.4.x) + * o register TTY driver + * o init cpc_tty_area struct + */ +void cpc_tty_init(pc300dev_t *pc300dev) +{ + unsigned long port; + int aux; + st_cpc_tty_area * cpc_tty; + + /* hdlcX - X=interface number */ + port = pc300dev->dev->name[4] - '0'; + if (port >= CPC_TTY_NPORTS) { + printk("%s-tty: invalid interface selected (0-%i): %li", + pc300dev->dev->name, + CPC_TTY_NPORTS-1,port); + return; + } + + if (cpc_tty_cnt == 0) { /* first TTY connection -> register driver */ + CPC_TTY_DBG("%s-tty: driver init, major:%i, minor range:%i=%i\n", + pc300dev->dev->name, + CPC_TTY_MAJOR, CPC_TTY_MINOR_START, + CPC_TTY_MINOR_START+CPC_TTY_NPORTS); + /* initialize tty driver struct */ + memset(&serial_drv,0,sizeof(struct tty_driver)); + serial_drv.magic = TTY_DRIVER_MAGIC; + serial_drv.owner = THIS_MODULE; + serial_drv.driver_name = "pc300_tty"; + serial_drv.name = "ttyCP"; + serial_drv.major = CPC_TTY_MAJOR; + serial_drv.minor_start = CPC_TTY_MINOR_START; + serial_drv.num = CPC_TTY_NPORTS; + serial_drv.type = TTY_DRIVER_TYPE_SERIAL; + serial_drv.subtype = SERIAL_TYPE_NORMAL; + + serial_drv.init_termios = tty_std_termios; + serial_drv.init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL; + serial_drv.flags = TTY_DRIVER_REAL_RAW; + + /* interface routines from the upper tty layer to the tty driver */ + tty_set_operations(&serial_drv, &pc300_ops); + + /* register the TTY driver */ + if (tty_register_driver(&serial_drv)) { + printk("%s-tty: Failed to register serial driver! ", + pc300dev->dev->name); + return; + } + + memset((void *)cpc_tty_area, 0, + sizeof(st_cpc_tty_area) * CPC_TTY_NPORTS); + } + + cpc_tty = &cpc_tty_area[port]; + + if (cpc_tty->state != CPC_TTY_ST_IDLE) { + CPC_TTY_DBG("%s-tty: TTY port %i, already in use.\n", + pc300dev->dev->name, port); + return; + } + + cpc_tty_cnt++; + cpc_tty->state = CPC_TTY_ST_INIT; + cpc_tty->num_open= 0; + cpc_tty->tty_minor = port + CPC_TTY_MINOR_START; + cpc_tty->pc300dev = pc300dev; + + INIT_WORK(&cpc_tty->tty_tx_work, cpc_tty_tx_work); + INIT_WORK(&cpc_tty->tty_rx_work, cpc_tty_rx_work); + + cpc_tty->buf_rx.first = cpc_tty->buf_rx.last = NULL; + + pc300dev->cpc_tty = (void *)cpc_tty; + + aux = strlen(pc300dev->dev->name); + memcpy(cpc_tty->name, pc300dev->dev->name, aux); + memcpy(&cpc_tty->name[aux], "-tty", 5); + + cpc_open(pc300dev->dev); + cpc_tty_signal_off(pc300dev, CTL_DTR); + + CPC_TTY_DBG("%s: Initializing TTY Sync Driver, tty major#%d minor#%i\n", + cpc_tty->name,CPC_TTY_MAJOR,cpc_tty->tty_minor); + return; +} + +/* + * PC300 TTY OPEN routine + * + * This routine is called by the tty driver to open the interface + * o verify minor + * o allocate buffer to Rx and Tx + */ +static int cpc_tty_open(struct tty_struct *tty, struct file *flip) +{ + int port ; + st_cpc_tty_area *cpc_tty; + + if (!tty) { + return -ENODEV; + } + + port = tty->index; + + if ((port < 0) || (port >= CPC_TTY_NPORTS)){ + CPC_TTY_DBG("pc300_tty: open invalid port %d\n", port); + return -ENODEV; + } + + cpc_tty = &cpc_tty_area[port]; + + if (cpc_tty->state == CPC_TTY_ST_IDLE){ + CPC_TTY_DBG("%s: open - invalid interface, port=%d\n", + cpc_tty->name, tty->index); + return -ENODEV; + } + + if (cpc_tty->num_open == 0) { /* first open of this tty */ + if (!cpc_tty_area[port].buf_tx){ + cpc_tty_area[port].buf_tx = kmalloc(CPC_TTY_MAX_MTU,GFP_KERNEL); + if (!cpc_tty_area[port].buf_tx) { + CPC_TTY_DBG("%s: error in memory allocation\n",cpc_tty->name); + return -ENOMEM; + } + } + + if (cpc_tty_area[port].buf_rx.first) { + unsigned char * aux; + while (cpc_tty_area[port].buf_rx.first) { + aux = (unsigned char *)cpc_tty_area[port].buf_rx.first; + cpc_tty_area[port].buf_rx.first = cpc_tty_area[port].buf_rx.first->next; + kfree(aux); + } + cpc_tty_area[port].buf_rx.first = NULL; + cpc_tty_area[port].buf_rx.last = NULL; + } + + cpc_tty_area[port].state = CPC_TTY_ST_OPEN; + cpc_tty_area[port].tty = tty; + tty->driver_data = &cpc_tty_area[port]; + + cpc_tty_signal_on(cpc_tty->pc300dev, CTL_DTR); + } + + cpc_tty->num_open++; + + CPC_TTY_DBG("%s: opening TTY driver\n", cpc_tty->name); + + /* avisar driver PC300 */ + return 0; +} + +/* + * PC300 TTY CLOSE routine + * + * This routine is called by the tty driver to close the interface + * o call close channel in PC300 driver (cpc_closech) + * o free Rx and Tx buffers + */ + +static void cpc_tty_close(struct tty_struct *tty, struct file *flip) +{ + st_cpc_tty_area *cpc_tty; + unsigned long flags; + int res; + + if (!tty || !tty->driver_data ) { + CPC_TTY_DBG("hdlx-tty: no TTY in close\n"); + return; + } + + cpc_tty = (st_cpc_tty_area *) tty->driver_data; + + if ((cpc_tty->tty != tty)|| (cpc_tty->state != CPC_TTY_ST_OPEN)) { + CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name); + return; + } + + if (!cpc_tty->num_open) { + CPC_TTY_DBG("%s: TTY is closed\n",cpc_tty->name); + return; + } + + if (--cpc_tty->num_open > 0) { + CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name); + return; + } + + cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR); + + CPC_TTY_LOCK(cpc_tty->pc300dev->chan->card, flags); /* lock irq */ + cpc_tty->tty = NULL; + cpc_tty->state = CPC_TTY_ST_INIT; + CPC_TTY_UNLOCK(cpc_tty->pc300dev->chan->card, flags); /* unlock irq */ + + if (cpc_tty->buf_rx.first) { + unsigned char * aux; + while (cpc_tty->buf_rx.first) { + aux = (unsigned char *)cpc_tty->buf_rx.first; + cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next; + kfree(aux); + } + cpc_tty->buf_rx.first = NULL; + cpc_tty->buf_rx.last = NULL; + } + + kfree(cpc_tty->buf_tx); + cpc_tty->buf_tx = NULL; + + CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name); + + if (!serial_drv.refcount && cpc_tty_unreg_flag) { + cpc_tty_unreg_flag = 0; + CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name); + if ((res=tty_unregister_driver(&serial_drv))) { + CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n", + cpc_tty->name,res); + } + } + return; +} + +/* + * PC300 TTY WRITE routine + * + * This routine is called by the tty driver to write a series of characters + * to the tty device. The characters may come from user or kernel space. + * o verify the DCD signal + * o send characters to board and start the transmission + */ +static int cpc_tty_write(struct tty_struct *tty, const unsigned char *buf, int count) +{ + st_cpc_tty_area *cpc_tty; + pc300ch_t *pc300chan; + pc300_t *card; + int ch; + unsigned long flags; + struct net_device_stats *stats; + + if (!tty || !tty->driver_data ) { + CPC_TTY_DBG("hdlcX-tty: no TTY in write\n"); + return -ENODEV; + } + + cpc_tty = (st_cpc_tty_area *) tty->driver_data; + + if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) { + CPC_TTY_DBG("%s: TTY is not opened\n", cpc_tty->name); + return -ENODEV; + } + + if (count > CPC_TTY_MAX_MTU) { + CPC_TTY_DBG("%s: count is invalid\n",cpc_tty->name); + return -EINVAL; /* frame too big */ + } + + CPC_TTY_DBG("%s: cpc_tty_write data len=%i\n",cpc_tty->name,count); + + pc300chan = (pc300ch_t *)((pc300dev_t*)cpc_tty->pc300dev)->chan; + stats = &cpc_tty->pc300dev->dev->stats; + card = (pc300_t *) pc300chan->card; + ch = pc300chan->channel; + + /* verify DCD signal*/ + if (cpc_readb(card->hw.scabase + M_REG(ST3,ch)) & ST3_DCD) { + /* DCD is OFF */ + CPC_TTY_DBG("%s : DCD is OFF\n", cpc_tty->name); + stats->tx_errors++; + stats->tx_carrier_errors++; + CPC_TTY_LOCK(card, flags); + cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_BUF_CLR); + + if (card->hw.type == PC300_TE) { + cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2, + cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) & + ~(CPLD_REG2_FALC_LED1 << (2 *ch))); + } + + CPC_TTY_UNLOCK(card, flags); + + return -EINVAL; + } + + if (cpc_tty_send_to_card(cpc_tty->pc300dev, (void*)buf, count)) { + /* failed to send */ + CPC_TTY_DBG("%s: trasmition error\n", cpc_tty->name); + return 0; + } + return count; +} + +/* + * PC300 TTY Write Room routine + * + * This routine returns the numbers of characteres the tty driver will accept + * for queuing to be written. + * o return MTU + */ +static int cpc_tty_write_room(struct tty_struct *tty) +{ + st_cpc_tty_area *cpc_tty; + + if (!tty || !tty->driver_data ) { + CPC_TTY_DBG("hdlcX-tty: no TTY to write room\n"); + return -ENODEV; + } + + cpc_tty = (st_cpc_tty_area *) tty->driver_data; + + if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) { + CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name); + return -ENODEV; + } + + CPC_TTY_DBG("%s: write room\n",cpc_tty->name); + + return CPC_TTY_MAX_MTU; +} + +/* + * PC300 TTY chars in buffer routine + * + * This routine returns the chars number in the transmission buffer + * o returns 0 + */ +static int cpc_tty_chars_in_buffer(struct tty_struct *tty) +{ + st_cpc_tty_area *cpc_tty; + + if (!tty || !tty->driver_data ) { + CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n"); + return -ENODEV; + } + + cpc_tty = (st_cpc_tty_area *) tty->driver_data; + + if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) { + CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name); + return -ENODEV; + } + + return 0; +} + +static int pc300_tiocmset(struct tty_struct *tty, + unsigned int set, unsigned int clear) +{ + st_cpc_tty_area *cpc_tty; + + CPC_TTY_DBG("%s: set:%x clear:%x\n", __func__, set, clear); + + if (!tty || !tty->driver_data ) { + CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n"); + return -ENODEV; + } + + cpc_tty = (st_cpc_tty_area *) tty->driver_data; + + if (set & TIOCM_RTS) + cpc_tty_signal_on(cpc_tty->pc300dev, CTL_RTS); + if (set & TIOCM_DTR) + cpc_tty_signal_on(cpc_tty->pc300dev, CTL_DTR); + + if (clear & TIOCM_RTS) + cpc_tty_signal_off(cpc_tty->pc300dev, CTL_RTS); + if (clear & TIOCM_DTR) + cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR); + + return 0; +} + +static int pc300_tiocmget(struct tty_struct *tty) +{ + unsigned int result; + unsigned char status; + unsigned long flags; + st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *) tty->driver_data; + pc300dev_t *pc300dev = cpc_tty->pc300dev; + pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan; + pc300_t *card = (pc300_t *) pc300chan->card; + int ch = pc300chan->channel; + + cpc_tty = (st_cpc_tty_area *) tty->driver_data; + + CPC_TTY_DBG("%s-tty: tiocmget\n", + ((struct net_device*)(pc300dev->hdlc))->name); + + CPC_TTY_LOCK(card, flags); + status = cpc_readb(card->hw.scabase+M_REG(CTL,ch)); + CPC_TTY_UNLOCK(card,flags); + + result = ((status & CTL_DTR) ? TIOCM_DTR : 0) | + ((status & CTL_RTS) ? TIOCM_RTS : 0); + + return result; +} + +/* + * PC300 TTY Flush Buffer routine + * + * This routine resets the transmission buffer + */ +static void cpc_tty_flush_buffer(struct tty_struct *tty) +{ + st_cpc_tty_area *cpc_tty; + + if (!tty || !tty->driver_data ) { + CPC_TTY_DBG("hdlcX-tty: no TTY to flush buffer\n"); + return; + } + + cpc_tty = (st_cpc_tty_area *) tty->driver_data; + + if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) { + CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name); + return; + } + + CPC_TTY_DBG("%s: call wake_up_interruptible\n",cpc_tty->name); + + tty_wakeup(tty); + return; +} + +/* + * PC300 TTY Hangup routine + * + * This routine is called by the tty driver to hangup the interface + * o clear DTR signal + */ + +static void cpc_tty_hangup(struct tty_struct *tty) +{ + st_cpc_tty_area *cpc_tty; + int res; + + if (!tty || !tty->driver_data ) { + CPC_TTY_DBG("hdlcX-tty: no TTY to hangup\n"); + return ; + } + + cpc_tty = (st_cpc_tty_area *) tty->driver_data; + + if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) { + CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name); + return ; + } + if (!serial_drv.refcount && cpc_tty_unreg_flag) { + cpc_tty_unreg_flag = 0; + CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name); + if ((res=tty_unregister_driver(&serial_drv))) { + CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n", + cpc_tty->name,res); + } + } + cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR); +} + +/* + * PC300 TTY RX work routine + * This routine treats RX work + * o verify read buffer + * o call the line disc. read + * o free memory + */ +static void cpc_tty_rx_work(struct work_struct *work) +{ + st_cpc_tty_area *cpc_tty; + unsigned long port; + int i, j; + volatile st_cpc_rx_buf *buf; + char flags=0,flg_rx=1; + struct tty_ldisc *ld; + + if (cpc_tty_cnt == 0) return; + + for (i=0; (i < 4) && flg_rx ; i++) { + flg_rx = 0; + + cpc_tty = container_of(work, st_cpc_tty_area, tty_rx_work); + port = cpc_tty - cpc_tty_area; + + for (j=0; j < CPC_TTY_NPORTS; j++) { + cpc_tty = &cpc_tty_area[port]; + + if ((buf=cpc_tty->buf_rx.first) != NULL) { + if (cpc_tty->tty) { + ld = tty_ldisc_ref(cpc_tty->tty); + if (ld) { + if (ld->ops->receive_buf) { + CPC_TTY_DBG("%s: call line disc. receive_buf\n",cpc_tty->name); + ld->ops->receive_buf(cpc_tty->tty, (char *)(buf->data), &flags, buf->size); + } + tty_ldisc_deref(ld); + } + } + cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next; + kfree((void *)buf); + buf = cpc_tty->buf_rx.first; + flg_rx = 1; + } + if (++port == CPC_TTY_NPORTS) port = 0; + } + } +} + +/* + * PC300 TTY RX work routine + * + * This routine treats RX interrupt. + * o read all frames in card + * o verify the frame size + * o read the frame in rx buffer + */ +static void cpc_tty_rx_disc_frame(pc300ch_t *pc300chan) +{ + volatile pcsca_bd_t __iomem * ptdescr; + volatile unsigned char status; + pc300_t *card = (pc300_t *)pc300chan->card; + int ch = pc300chan->channel; + + /* dma buf read */ + ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + + RX_BD_ADDR(ch, pc300chan->rx_first_bd)); + while (pc300chan->rx_first_bd != pc300chan->rx_last_bd) { + status = cpc_readb(&ptdescr->status); + cpc_writeb(&ptdescr->status, 0); + cpc_writeb(&ptdescr->len, 0); + pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) & + (N_DMA_RX_BUF - 1); + if (status & DST_EOM) { + break; /* end of message */ + } + ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + cpc_readl(&ptdescr->next)); + } +} + +void cpc_tty_receive(pc300dev_t *pc300dev) +{ + st_cpc_tty_area *cpc_tty; + pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan; + pc300_t *card = (pc300_t *)pc300chan->card; + int ch = pc300chan->channel; + volatile pcsca_bd_t __iomem * ptdescr; + struct net_device_stats *stats = &pc300dev->dev->stats; + int rx_len, rx_aux; + volatile unsigned char status; + unsigned short first_bd = pc300chan->rx_first_bd; + st_cpc_rx_buf *new = NULL; + unsigned char dsr_rx; + + if (pc300dev->cpc_tty == NULL) { + return; + } + + dsr_rx = cpc_readb(card->hw.scabase + DSR_RX(ch)); + + cpc_tty = pc300dev->cpc_tty; + + while (1) { + rx_len = 0; + ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + RX_BD_ADDR(ch, first_bd)); + while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) { + rx_len += cpc_readw(&ptdescr->len); + first_bd = (first_bd + 1) & (N_DMA_RX_BUF - 1); + if (status & DST_EOM) { + break; + } + ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase+cpc_readl(&ptdescr->next)); + } + + if (!rx_len) { + if (dsr_rx & DSR_BOF) { + /* update EDA */ + cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch), + RX_BD_ADDR(ch, pc300chan->rx_last_bd)); + } + kfree(new); + return; + } + + if (rx_len > CPC_TTY_MAX_MTU) { + /* Free RX descriptors */ + CPC_TTY_DBG("%s: frame size is invalid.\n",cpc_tty->name); + stats->rx_errors++; + stats->rx_frame_errors++; + cpc_tty_rx_disc_frame(pc300chan); + continue; + } + + new = kmalloc(rx_len + sizeof(st_cpc_rx_buf), GFP_ATOMIC); + if (!new) { + cpc_tty_rx_disc_frame(pc300chan); + continue; + } + + /* dma buf read */ + ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + + RX_BD_ADDR(ch, pc300chan->rx_first_bd)); + + rx_len = 0; /* counter frame size */ + + while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) { + rx_aux = cpc_readw(&ptdescr->len); + if ((status & (DST_OVR | DST_CRC | DST_RBIT | DST_SHRT | DST_ABT)) + || (rx_aux > BD_DEF_LEN)) { + CPC_TTY_DBG("%s: reception error\n", cpc_tty->name); + stats->rx_errors++; + if (status & DST_OVR) { + stats->rx_fifo_errors++; + } + if (status & DST_CRC) { + stats->rx_crc_errors++; + } + if ((status & (DST_RBIT | DST_SHRT | DST_ABT)) || + (rx_aux > BD_DEF_LEN)) { + stats->rx_frame_errors++; + } + /* discard remainig descriptors used by the bad frame */ + CPC_TTY_DBG("%s: reception error - discard descriptors", + cpc_tty->name); + cpc_tty_rx_disc_frame(pc300chan); + rx_len = 0; + kfree(new); + new = NULL; + break; /* read next frame - while(1) */ + } + + if (cpc_tty->state != CPC_TTY_ST_OPEN) { + /* Free RX descriptors */ + cpc_tty_rx_disc_frame(pc300chan); + stats->rx_dropped++; + rx_len = 0; + kfree(new); + new = NULL; + break; /* read next frame - while(1) */ + } + + /* read the segment of the frame */ + if (rx_aux != 0) { + memcpy_fromio((new->data + rx_len), + (void __iomem *)(card->hw.rambase + + cpc_readl(&ptdescr->ptbuf)), rx_aux); + rx_len += rx_aux; + } + cpc_writeb(&ptdescr->status,0); + cpc_writeb(&ptdescr->len, 0); + pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) & + (N_DMA_RX_BUF -1); + if (status & DST_EOM)break; + + ptdescr = (pcsca_bd_t __iomem *) (card->hw.rambase + + cpc_readl(&ptdescr->next)); + } + /* update pointer */ + pc300chan->rx_last_bd = (pc300chan->rx_first_bd - 1) & + (N_DMA_RX_BUF - 1) ; + if (!(dsr_rx & DSR_BOF)) { + /* update EDA */ + cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch), + RX_BD_ADDR(ch, pc300chan->rx_last_bd)); + } + if (rx_len != 0) { + stats->rx_bytes += rx_len; + + if (pc300dev->trace_on) { + cpc_tty_trace(pc300dev, new->data,rx_len, 'R'); + } + new->size = rx_len; + new->next = NULL; + if (cpc_tty->buf_rx.first == NULL) { + cpc_tty->buf_rx.first = new; + cpc_tty->buf_rx.last = new; + } else { + cpc_tty->buf_rx.last->next = new; + cpc_tty->buf_rx.last = new; + } + schedule_work(&(cpc_tty->tty_rx_work)); + stats->rx_packets++; + } + } +} + +/* + * PC300 TTY TX work routine + * + * This routine treats TX interrupt. + * o if need call line discipline wakeup + * o call wake_up_interruptible + */ +static void cpc_tty_tx_work(struct work_struct *work) +{ + st_cpc_tty_area *cpc_tty = + container_of(work, st_cpc_tty_area, tty_tx_work); + struct tty_struct *tty; + + CPC_TTY_DBG("%s: cpc_tty_tx_work init\n",cpc_tty->name); + + if ((tty = cpc_tty->tty) == NULL) { + CPC_TTY_DBG("%s: the interface is not opened\n",cpc_tty->name); + return; + } + tty_wakeup(tty); +} + +/* + * PC300 TTY send to card routine + * + * This routine send data to card. + * o clear descriptors + * o write data to DMA buffers + * o start the transmission + */ +static int cpc_tty_send_to_card(pc300dev_t *dev,void* buf, int len) +{ + pc300ch_t *chan = (pc300ch_t *)dev->chan; + pc300_t *card = (pc300_t *)chan->card; + int ch = chan->channel; + struct net_device_stats *stats = &dev->dev->stats; + unsigned long flags; + volatile pcsca_bd_t __iomem *ptdescr; + int i, nchar; + int tosend = len; + int nbuf = ((len - 1)/BD_DEF_LEN) + 1; + unsigned char *pdata=buf; + + CPC_TTY_DBG("%s:cpc_tty_send_to_cars len=%i", + (st_cpc_tty_area *)dev->cpc_tty->name,len); + + if (nbuf >= card->chan[ch].nfree_tx_bd) { + return 1; + } + + /* write buffer to DMA buffers */ + CPC_TTY_DBG("%s: call dma_buf_write\n", + (st_cpc_tty_area *)dev->cpc_tty->name); + for (i = 0 ; i < nbuf ; i++) { + ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + + TX_BD_ADDR(ch, card->chan[ch].tx_next_bd)); + nchar = (BD_DEF_LEN > tosend) ? tosend : BD_DEF_LEN; + if (cpc_readb(&ptdescr->status) & DST_OSB) { + memcpy_toio((void __iomem *)(card->hw.rambase + + cpc_readl(&ptdescr->ptbuf)), + &pdata[len - tosend], + nchar); + card->chan[ch].nfree_tx_bd--; + if ((i + 1) == nbuf) { + /* This must be the last BD to be used */ + cpc_writeb(&ptdescr->status, DST_EOM); + } else { + cpc_writeb(&ptdescr->status, 0); + } + cpc_writew(&ptdescr->len, nchar); + } else { + CPC_TTY_DBG("%s: error in dma_buf_write\n", + (st_cpc_tty_area *)dev->cpc_tty->name); + stats->tx_dropped++; + return 1; + } + tosend -= nchar; + card->chan[ch].tx_next_bd = + (card->chan[ch].tx_next_bd + 1) & (N_DMA_TX_BUF - 1); + } + + if (dev->trace_on) { + cpc_tty_trace(dev, buf, len,'T'); + } + + /* start transmission */ + CPC_TTY_DBG("%s: start transmission\n", + (st_cpc_tty_area *)dev->cpc_tty->name); + + CPC_TTY_LOCK(card, flags); + cpc_writeb(card->hw.scabase + DTX_REG(EDAL, ch), + TX_BD_ADDR(ch, chan->tx_next_bd)); + cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_ENA); + cpc_writeb(card->hw.scabase + DSR_TX(ch), DSR_DE); + + if (card->hw.type == PC300_TE) { + cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2, + cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) | + (CPLD_REG2_FALC_LED1 << (2 * ch))); + } + CPC_TTY_UNLOCK(card, flags); + return 0; +} + +/* + * PC300 TTY trace routine + * + * This routine send trace of connection to application. + * o clear descriptors + * o write data to DMA buffers + * o start the transmission + */ + +static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx) +{ + struct sk_buff *skb; + + if ((skb = dev_alloc_skb(10 + len)) == NULL) { + /* out of memory */ + CPC_TTY_DBG("%s: tty_trace - out of memory\n", dev->dev->name); + return; + } + + skb_put (skb, 10 + len); + skb->dev = dev->dev; + skb->protocol = htons(ETH_P_CUST); + skb_reset_mac_header(skb); + skb->pkt_type = PACKET_HOST; + skb->len = 10 + len; + + skb_copy_to_linear_data(skb, dev->dev->name, 5); + skb->data[5] = '['; + skb->data[6] = rxtx; + skb->data[7] = ']'; + skb->data[8] = ':'; + skb->data[9] = ' '; + skb_copy_to_linear_data_offset(skb, 10, buf, len); + netif_rx(skb); +} + +/* + * PC300 TTY unregister service routine + * + * This routine unregister one interface. + */ +void cpc_tty_unregister_service(pc300dev_t *pc300dev) +{ + st_cpc_tty_area *cpc_tty; + ulong flags; + int res; + + if ((cpc_tty= (st_cpc_tty_area *) pc300dev->cpc_tty) == NULL) { + CPC_TTY_DBG("%s: interface is not TTY\n", pc300dev->dev->name); + return; + } + CPC_TTY_DBG("%s: cpc_tty_unregister_service", cpc_tty->name); + + if (cpc_tty->pc300dev != pc300dev) { + CPC_TTY_DBG("%s: invalid tty ptr=%s\n", + pc300dev->dev->name, cpc_tty->name); + return; + } + + if (--cpc_tty_cnt == 0) { + if (serial_drv.refcount) { + CPC_TTY_DBG("%s: unregister is not possible, refcount=%d", + cpc_tty->name, serial_drv.refcount); + cpc_tty_cnt++; + cpc_tty_unreg_flag = 1; + return; + } else { + CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name); + if ((res=tty_unregister_driver(&serial_drv))) { + CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n", + cpc_tty->name,res); + } + } + } + CPC_TTY_LOCK(pc300dev->chan->card,flags); + cpc_tty->tty = NULL; + CPC_TTY_UNLOCK(pc300dev->chan->card, flags); + cpc_tty->tty_minor = 0; + cpc_tty->state = CPC_TTY_ST_IDLE; +} + +/* + * PC300 TTY trigger poll routine + * This routine is called by pc300driver to treats Tx interrupt. + */ +void cpc_tty_trigger_poll(pc300dev_t *pc300dev) +{ + st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *)pc300dev->cpc_tty; + if (!cpc_tty) { + return; + } + schedule_work(&(cpc_tty->tty_tx_work)); +} |