diff options
Diffstat (limited to 'drivers/char/pcmcia/synclink_cs.c')
| -rw-r--r-- | drivers/char/pcmcia/synclink_cs.c | 4340 |
1 files changed, 4340 insertions, 0 deletions
diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c new file mode 100644 index 000000000..0ea998605 --- /dev/null +++ b/drivers/char/pcmcia/synclink_cs.c @@ -0,0 +1,4340 @@ +/* + * linux/drivers/char/pcmcia/synclink_cs.c + * + * $Id: synclink_cs.c,v 4.34 2005/09/08 13:20:54 paulkf Exp $ + * + * Device driver for Microgate SyncLink PC Card + * multiprotocol serial adapter. + * + * written by Paul Fulghum for Microgate Corporation + * paulkf@microgate.com + * + * Microgate and SyncLink are trademarks of Microgate Corporation + * + * This code is released under the GNU General Public License (GPL) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq)) +#if defined(__i386__) +# define BREAKPOINT() asm(" int $3"); +#else +# define BREAKPOINT() { } +#endif + +#define MAX_DEVICE_COUNT 4 + +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/timer.h> +#include <linux/time.h> +#include <linux/interrupt.h> +#include <linux/tty.h> +#include <linux/tty_flip.h> +#include <linux/serial.h> +#include <linux/major.h> +#include <linux/string.h> +#include <linux/fcntl.h> +#include <linux/ptrace.h> +#include <linux/ioport.h> +#include <linux/mm.h> +#include <linux/seq_file.h> +#include <linux/slab.h> +#include <linux/netdevice.h> +#include <linux/vmalloc.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/ioctl.h> +#include <linux/synclink.h> + +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/dma.h> +#include <linux/bitops.h> +#include <asm/types.h> +#include <linux/termios.h> +#include <linux/workqueue.h> +#include <linux/hdlc.h> + +#include <pcmcia/cistpl.h> +#include <pcmcia/cisreg.h> +#include <pcmcia/ds.h> + +#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE)) +#define SYNCLINK_GENERIC_HDLC 1 +#else +#define SYNCLINK_GENERIC_HDLC 0 +#endif + +#define GET_USER(error,value,addr) error = get_user(value,addr) +#define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0 +#define PUT_USER(error,value,addr) error = put_user(value,addr) +#define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0 + +#include <asm/uaccess.h> + +static MGSL_PARAMS default_params = { + MGSL_MODE_HDLC, /* unsigned long mode */ + 0, /* unsigned char loopback; */ + HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */ + HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */ + 0, /* unsigned long clock_speed; */ + 0xff, /* unsigned char addr_filter; */ + HDLC_CRC_16_CCITT, /* unsigned short crc_type; */ + HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */ + HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */ + 9600, /* unsigned long data_rate; */ + 8, /* unsigned char data_bits; */ + 1, /* unsigned char stop_bits; */ + ASYNC_PARITY_NONE /* unsigned char parity; */ +}; + +typedef struct { + int count; + unsigned char status; + char data[1]; +} RXBUF; + +/* The queue of BH actions to be performed */ + +#define BH_RECEIVE 1 +#define BH_TRANSMIT 2 +#define BH_STATUS 4 + +#define IO_PIN_SHUTDOWN_LIMIT 100 + +#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) + +struct _input_signal_events { + int ri_up; + int ri_down; + int dsr_up; + int dsr_down; + int dcd_up; + int dcd_down; + int cts_up; + int cts_down; +}; + + +/* + * Device instance data structure + */ + +typedef struct _mgslpc_info { + struct tty_port port; + void *if_ptr; /* General purpose pointer (used by SPPP) */ + int magic; + int line; + + struct mgsl_icount icount; + + int timeout; + int x_char; /* xon/xoff character */ + unsigned char read_status_mask; + unsigned char ignore_status_mask; + + unsigned char *tx_buf; + int tx_put; + int tx_get; + int tx_count; + + /* circular list of fixed length rx buffers */ + + unsigned char *rx_buf; /* memory allocated for all rx buffers */ + int rx_buf_total_size; /* size of memory allocated for rx buffers */ + int rx_put; /* index of next empty rx buffer */ + int rx_get; /* index of next full rx buffer */ + int rx_buf_size; /* size in bytes of single rx buffer */ + int rx_buf_count; /* total number of rx buffers */ + int rx_frame_count; /* number of full rx buffers */ + + wait_queue_head_t status_event_wait_q; + wait_queue_head_t event_wait_q; + struct timer_list tx_timer; /* HDLC transmit timeout timer */ + struct _mgslpc_info *next_device; /* device list link */ + + unsigned short imra_value; + unsigned short imrb_value; + unsigned char pim_value; + + spinlock_t lock; + struct work_struct task; /* task structure for scheduling bh */ + + u32 max_frame_size; + + u32 pending_bh; + + bool bh_running; + bool bh_requested; + + int dcd_chkcount; /* check counts to prevent */ + int cts_chkcount; /* too many IRQs if a signal */ + int dsr_chkcount; /* is floating */ + int ri_chkcount; + + bool rx_enabled; + bool rx_overflow; + + bool tx_enabled; + bool tx_active; + bool tx_aborting; + u32 idle_mode; + + int if_mode; /* serial interface selection (RS-232, v.35 etc) */ + + char device_name[25]; /* device instance name */ + + unsigned int io_base; /* base I/O address of adapter */ + unsigned int irq_level; + + MGSL_PARAMS params; /* communications parameters */ + + unsigned char serial_signals; /* current serial signal states */ + + bool irq_occurred; /* for diagnostics use */ + char testing_irq; + unsigned int init_error; /* startup error (DIAGS) */ + + char *flag_buf; + bool drop_rts_on_tx_done; + + struct _input_signal_events input_signal_events; + + /* PCMCIA support */ + struct pcmcia_device *p_dev; + int stop; + + /* SPPP/Cisco HDLC device parts */ + int netcount; + spinlock_t netlock; + +#if SYNCLINK_GENERIC_HDLC + struct net_device *netdev; +#endif + +} MGSLPC_INFO; + +#define MGSLPC_MAGIC 0x5402 + +/* + * The size of the serial xmit buffer is 1 page, or 4096 bytes + */ +#define TXBUFSIZE 4096 + + +#define CHA 0x00 /* channel A offset */ +#define CHB 0x40 /* channel B offset */ + +/* + * FIXME: PPC has PVR defined in asm/reg.h. For now we just undef it. + */ +#undef PVR + +#define RXFIFO 0 +#define TXFIFO 0 +#define STAR 0x20 +#define CMDR 0x20 +#define RSTA 0x21 +#define PRE 0x21 +#define MODE 0x22 +#define TIMR 0x23 +#define XAD1 0x24 +#define XAD2 0x25 +#define RAH1 0x26 +#define RAH2 0x27 +#define DAFO 0x27 +#define RAL1 0x28 +#define RFC 0x28 +#define RHCR 0x29 +#define RAL2 0x29 +#define RBCL 0x2a +#define XBCL 0x2a +#define RBCH 0x2b +#define XBCH 0x2b +#define CCR0 0x2c +#define CCR1 0x2d +#define CCR2 0x2e +#define CCR3 0x2f +#define VSTR 0x34 +#define BGR 0x34 +#define RLCR 0x35 +#define AML 0x36 +#define AMH 0x37 +#define GIS 0x38 +#define IVA 0x38 +#define IPC 0x39 +#define ISR 0x3a +#define IMR 0x3a +#define PVR 0x3c +#define PIS 0x3d +#define PIM 0x3d +#define PCR 0x3e +#define CCR4 0x3f + +// IMR/ISR + +#define IRQ_BREAK_ON BIT15 // rx break detected +#define IRQ_DATAOVERRUN BIT14 // receive data overflow +#define IRQ_ALLSENT BIT13 // all sent +#define IRQ_UNDERRUN BIT12 // transmit data underrun +#define IRQ_TIMER BIT11 // timer interrupt +#define IRQ_CTS BIT10 // CTS status change +#define IRQ_TXREPEAT BIT9 // tx message repeat +#define IRQ_TXFIFO BIT8 // transmit pool ready +#define IRQ_RXEOM BIT7 // receive message end +#define IRQ_EXITHUNT BIT6 // receive frame start +#define IRQ_RXTIME BIT6 // rx char timeout +#define IRQ_DCD BIT2 // carrier detect status change +#define IRQ_OVERRUN BIT1 // receive frame overflow +#define IRQ_RXFIFO BIT0 // receive pool full + +// STAR + +#define XFW BIT6 // transmit FIFO write enable +#define CEC BIT2 // command executing +#define CTS BIT1 // CTS state + +#define PVR_DTR BIT0 +#define PVR_DSR BIT1 +#define PVR_RI BIT2 +#define PVR_AUTOCTS BIT3 +#define PVR_RS232 0x20 /* 0010b */ +#define PVR_V35 0xe0 /* 1110b */ +#define PVR_RS422 0x40 /* 0100b */ + +/* Register access functions */ + +#define write_reg(info, reg, val) outb((val),(info)->io_base + (reg)) +#define read_reg(info, reg) inb((info)->io_base + (reg)) + +#define read_reg16(info, reg) inw((info)->io_base + (reg)) +#define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg)) + +#define set_reg_bits(info, reg, mask) \ + write_reg(info, (reg), \ + (unsigned char) (read_reg(info, (reg)) | (mask))) +#define clear_reg_bits(info, reg, mask) \ + write_reg(info, (reg), \ + (unsigned char) (read_reg(info, (reg)) & ~(mask))) +/* + * interrupt enable/disable routines + */ +static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask) +{ + if (channel == CHA) { + info->imra_value |= mask; + write_reg16(info, CHA + IMR, info->imra_value); + } else { + info->imrb_value |= mask; + write_reg16(info, CHB + IMR, info->imrb_value); + } +} +static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask) +{ + if (channel == CHA) { + info->imra_value &= ~mask; + write_reg16(info, CHA + IMR, info->imra_value); + } else { + info->imrb_value &= ~mask; + write_reg16(info, CHB + IMR, info->imrb_value); + } +} + +#define port_irq_disable(info, mask) \ + { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); } + +#define port_irq_enable(info, mask) \ + { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); } + +static void rx_start(MGSLPC_INFO *info); +static void rx_stop(MGSLPC_INFO *info); + +static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty); +static void tx_stop(MGSLPC_INFO *info); +static void tx_set_idle(MGSLPC_INFO *info); + +static void get_signals(MGSLPC_INFO *info); +static void set_signals(MGSLPC_INFO *info); + +static void reset_device(MGSLPC_INFO *info); + +static void hdlc_mode(MGSLPC_INFO *info); +static void async_mode(MGSLPC_INFO *info); + +static void tx_timeout(unsigned long context); + +static int carrier_raised(struct tty_port *port); +static void dtr_rts(struct tty_port *port, int onoff); + +#if SYNCLINK_GENERIC_HDLC +#define dev_to_port(D) (dev_to_hdlc(D)->priv) +static void hdlcdev_tx_done(MGSLPC_INFO *info); +static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size); +static int hdlcdev_init(MGSLPC_INFO *info); +static void hdlcdev_exit(MGSLPC_INFO *info); +#endif + +static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit); + +static bool register_test(MGSLPC_INFO *info); +static bool irq_test(MGSLPC_INFO *info); +static int adapter_test(MGSLPC_INFO *info); + +static int claim_resources(MGSLPC_INFO *info); +static void release_resources(MGSLPC_INFO *info); +static int mgslpc_add_device(MGSLPC_INFO *info); +static void mgslpc_remove_device(MGSLPC_INFO *info); + +static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty); +static void rx_reset_buffers(MGSLPC_INFO *info); +static int rx_alloc_buffers(MGSLPC_INFO *info); +static void rx_free_buffers(MGSLPC_INFO *info); + +static irqreturn_t mgslpc_isr(int irq, void *dev_id); + +/* + * Bottom half interrupt handlers + */ +static void bh_handler(struct work_struct *work); +static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty); +static void bh_status(MGSLPC_INFO *info); + +/* + * ioctl handlers + */ +static int tiocmget(struct tty_struct *tty); +static int tiocmset(struct tty_struct *tty, + unsigned int set, unsigned int clear); +static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount); +static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params); +static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty); +static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode); +static int set_txidle(MGSLPC_INFO *info, int idle_mode); +static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty); +static int tx_abort(MGSLPC_INFO *info); +static int set_rxenable(MGSLPC_INFO *info, int enable); +static int wait_events(MGSLPC_INFO *info, int __user *mask); + +static MGSLPC_INFO *mgslpc_device_list = NULL; +static int mgslpc_device_count = 0; + +/* + * Set this param to non-zero to load eax with the + * .text section address and breakpoint on module load. + * This is useful for use with gdb and add-symbol-file command. + */ +static bool break_on_load=0; + +/* + * Driver major number, defaults to zero to get auto + * assigned major number. May be forced as module parameter. + */ +static int ttymajor=0; + +static int debug_level = 0; +static int maxframe[MAX_DEVICE_COUNT] = {0,}; + +module_param(break_on_load, bool, 0); +module_param(ttymajor, int, 0); +module_param(debug_level, int, 0); +module_param_array(maxframe, int, NULL, 0); + +MODULE_LICENSE("GPL"); + +static char *driver_name = "SyncLink PC Card driver"; +static char *driver_version = "$Revision: 4.34 $"; + +static struct tty_driver *serial_driver; + +/* number of characters left in xmit buffer before we ask for more */ +#define WAKEUP_CHARS 256 + +static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty); +static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout); + +/* PCMCIA prototypes */ + +static int mgslpc_config(struct pcmcia_device *link); +static void mgslpc_release(u_long arg); +static void mgslpc_detach(struct pcmcia_device *p_dev); + +/* + * 1st function defined in .text section. Calling this function in + * init_module() followed by a breakpoint allows a remote debugger + * (gdb) to get the .text address for the add-symbol-file command. + * This allows remote debugging of dynamically loadable modules. + */ +static void* mgslpc_get_text_ptr(void) +{ + return mgslpc_get_text_ptr; +} + +/** + * line discipline callback wrappers + * + * The wrappers maintain line discipline references + * while calling into the line discipline. + * + * ldisc_receive_buf - pass receive data to line discipline + */ + +static void ldisc_receive_buf(struct tty_struct *tty, + const __u8 *data, char *flags, int count) +{ + struct tty_ldisc *ld; + if (!tty) + return; + ld = tty_ldisc_ref(tty); + if (ld) { + if (ld->ops->receive_buf) + ld->ops->receive_buf(tty, data, flags, count); + tty_ldisc_deref(ld); + } +} + +static const struct tty_port_operations mgslpc_port_ops = { + .carrier_raised = carrier_raised, + .dtr_rts = dtr_rts +}; + +static int mgslpc_probe(struct pcmcia_device *link) +{ + MGSLPC_INFO *info; + int ret; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("mgslpc_attach\n"); + + info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL); + if (!info) { + printk("Error can't allocate device instance data\n"); + return -ENOMEM; + } + + info->magic = MGSLPC_MAGIC; + tty_port_init(&info->port); + info->port.ops = &mgslpc_port_ops; + INIT_WORK(&info->task, bh_handler); + info->max_frame_size = 4096; + info->port.close_delay = 5*HZ/10; + info->port.closing_wait = 30*HZ; + init_waitqueue_head(&info->status_event_wait_q); + init_waitqueue_head(&info->event_wait_q); + spin_lock_init(&info->lock); + spin_lock_init(&info->netlock); + memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS)); + info->idle_mode = HDLC_TXIDLE_FLAGS; + info->imra_value = 0xffff; + info->imrb_value = 0xffff; + info->pim_value = 0xff; + + info->p_dev = link; + link->priv = info; + + /* Initialize the struct pcmcia_device structure */ + + ret = mgslpc_config(link); + if (ret != 0) + goto failed; + + ret = mgslpc_add_device(info); + if (ret != 0) + goto failed_release; + + return 0; + +failed_release: + mgslpc_release((u_long)link); +failed: + tty_port_destroy(&info->port); + kfree(info); + return ret; +} + +/* Card has been inserted. + */ + +static int mgslpc_ioprobe(struct pcmcia_device *p_dev, void *priv_data) +{ + return pcmcia_request_io(p_dev); +} + +static int mgslpc_config(struct pcmcia_device *link) +{ + MGSLPC_INFO *info = link->priv; + int ret; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("mgslpc_config(0x%p)\n", link); + + link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO; + + ret = pcmcia_loop_config(link, mgslpc_ioprobe, NULL); + if (ret != 0) + goto failed; + + link->config_index = 8; + link->config_regs = PRESENT_OPTION; + + ret = pcmcia_request_irq(link, mgslpc_isr); + if (ret) + goto failed; + ret = pcmcia_enable_device(link); + if (ret) + goto failed; + + info->io_base = link->resource[0]->start; + info->irq_level = link->irq; + return 0; + +failed: + mgslpc_release((u_long)link); + return -ENODEV; +} + +/* Card has been removed. + * Unregister device and release PCMCIA configuration. + * If device is open, postpone until it is closed. + */ +static void mgslpc_release(u_long arg) +{ + struct pcmcia_device *link = (struct pcmcia_device *)arg; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("mgslpc_release(0x%p)\n", link); + + pcmcia_disable_device(link); +} + +static void mgslpc_detach(struct pcmcia_device *link) +{ + if (debug_level >= DEBUG_LEVEL_INFO) + printk("mgslpc_detach(0x%p)\n", link); + + ((MGSLPC_INFO *)link->priv)->stop = 1; + mgslpc_release((u_long)link); + + mgslpc_remove_device((MGSLPC_INFO *)link->priv); +} + +static int mgslpc_suspend(struct pcmcia_device *link) +{ + MGSLPC_INFO *info = link->priv; + + info->stop = 1; + + return 0; +} + +static int mgslpc_resume(struct pcmcia_device *link) +{ + MGSLPC_INFO *info = link->priv; + + info->stop = 0; + + return 0; +} + + +static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info, + char *name, const char *routine) +{ +#ifdef MGSLPC_PARANOIA_CHECK + static const char *badmagic = + "Warning: bad magic number for mgsl struct (%s) in %s\n"; + static const char *badinfo = + "Warning: null mgslpc_info for (%s) in %s\n"; + + if (!info) { + printk(badinfo, name, routine); + return true; + } + if (info->magic != MGSLPC_MAGIC) { + printk(badmagic, name, routine); + return true; + } +#else + if (!info) + return true; +#endif + return false; +} + + +#define CMD_RXFIFO BIT7 // release current rx FIFO +#define CMD_RXRESET BIT6 // receiver reset +#define CMD_RXFIFO_READ BIT5 +#define CMD_START_TIMER BIT4 +#define CMD_TXFIFO BIT3 // release current tx FIFO +#define CMD_TXEOM BIT1 // transmit end message +#define CMD_TXRESET BIT0 // transmit reset + +static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel) +{ + int i = 0; + /* wait for command completion */ + while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) { + udelay(1); + if (i++ == 1000) + return false; + } + return true; +} + +static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd) +{ + wait_command_complete(info, channel); + write_reg(info, (unsigned char) (channel + CMDR), cmd); +} + +static void tx_pause(struct tty_struct *tty) +{ + MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; + unsigned long flags; + + if (mgslpc_paranoia_check(info, tty->name, "tx_pause")) + return; + if (debug_level >= DEBUG_LEVEL_INFO) + printk("tx_pause(%s)\n", info->device_name); + + spin_lock_irqsave(&info->lock, flags); + if (info->tx_enabled) + tx_stop(info); + spin_unlock_irqrestore(&info->lock, flags); +} + +static void tx_release(struct tty_struct *tty) +{ + MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; + unsigned long flags; + + if (mgslpc_paranoia_check(info, tty->name, "tx_release")) + return; + if (debug_level >= DEBUG_LEVEL_INFO) + printk("tx_release(%s)\n", info->device_name); + + spin_lock_irqsave(&info->lock, flags); + if (!info->tx_enabled) + tx_start(info, tty); + spin_unlock_irqrestore(&info->lock, flags); +} + +/* Return next bottom half action to perform. + * or 0 if nothing to do. + */ +static int bh_action(MGSLPC_INFO *info) +{ + unsigned long flags; + int rc = 0; + + spin_lock_irqsave(&info->lock, flags); + + if (info->pending_bh & BH_RECEIVE) { + info->pending_bh &= ~BH_RECEIVE; + rc = BH_RECEIVE; + } else if (info->pending_bh & BH_TRANSMIT) { + info->pending_bh &= ~BH_TRANSMIT; + rc = BH_TRANSMIT; + } else if (info->pending_bh & BH_STATUS) { + info->pending_bh &= ~BH_STATUS; + rc = BH_STATUS; + } + + if (!rc) { + /* Mark BH routine as complete */ + info->bh_running = false; + info->bh_requested = false; + } + + spin_unlock_irqrestore(&info->lock, flags); + + return rc; +} + +static void bh_handler(struct work_struct *work) +{ + MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task); + struct tty_struct *tty; + int action; + + if (debug_level >= DEBUG_LEVEL_BH) + printk("%s(%d):bh_handler(%s) entry\n", + __FILE__,__LINE__,info->device_name); + + info->bh_running = true; + tty = tty_port_tty_get(&info->port); + + while((action = bh_action(info)) != 0) { + + /* Process work item */ + if (debug_level >= DEBUG_LEVEL_BH) + printk("%s(%d):bh_handler() work item action=%d\n", + __FILE__,__LINE__,action); + + switch (action) { + + case BH_RECEIVE: + while(rx_get_frame(info, tty)); + break; + case BH_TRANSMIT: + bh_transmit(info, tty); + break; + case BH_STATUS: + bh_status(info); + break; + default: + /* unknown work item ID */ + printk("Unknown work item ID=%08X!\n", action); + break; + } + } + + tty_kref_put(tty); + if (debug_level >= DEBUG_LEVEL_BH) + printk("%s(%d):bh_handler(%s) exit\n", + __FILE__,__LINE__,info->device_name); +} + +static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty) +{ + if (debug_level >= DEBUG_LEVEL_BH) + printk("bh_transmit() entry on %s\n", info->device_name); + + if (tty) + tty_wakeup(tty); +} + +static void bh_status(MGSLPC_INFO *info) +{ + info->ri_chkcount = 0; + info->dsr_chkcount = 0; + info->dcd_chkcount = 0; + info->cts_chkcount = 0; +} + +/* eom: non-zero = end of frame */ +static void rx_ready_hdlc(MGSLPC_INFO *info, int eom) +{ + unsigned char data[2]; + unsigned char fifo_count, read_count, i; + RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size)); + + if (debug_level >= DEBUG_LEVEL_ISR) + printk("%s(%d):rx_ready_hdlc(eom=%d)\n", __FILE__, __LINE__, eom); + + if (!info->rx_enabled) + return; + + if (info->rx_frame_count >= info->rx_buf_count) { + /* no more free buffers */ + issue_command(info, CHA, CMD_RXRESET); + info->pending_bh |= BH_RECEIVE; + info->rx_overflow = true; + info->icount.buf_overrun++; + return; + } + + if (eom) { + /* end of frame, get FIFO count from RBCL register */ + fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f); + if (fifo_count == 0) + fifo_count = 32; + } else + fifo_count = 32; + + do { + if (fifo_count == 1) { + read_count = 1; + data[0] = read_reg(info, CHA + RXFIFO); + } else { + read_count = 2; + *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO); + } + fifo_count -= read_count; + if (!fifo_count && eom) + buf->status = data[--read_count]; + + for (i = 0; i < read_count; i++) { + if (buf->count >= info->max_frame_size) { + /* frame too large, reset receiver and reset current buffer */ + issue_command(info, CHA, CMD_RXRESET); + buf->count = 0; + return; + } + *(buf->data + buf->count) = data[i]; + buf->count++; + } + } while (fifo_count); + + if (eom) { + info->pending_bh |= BH_RECEIVE; + info->rx_frame_count++; + info->rx_put++; + if (info->rx_put >= info->rx_buf_count) + info->rx_put = 0; + } + issue_command(info, CHA, CMD_RXFIFO); +} + +static void rx_ready_async(MGSLPC_INFO *info, int tcd) +{ + struct tty_port *port = &info->port; + unsigned char data, status, flag; + int fifo_count; + int work = 0; + struct mgsl_icount *icount = &info->icount; + + if (tcd) { + /* early termination, get FIFO count from RBCL register */ + fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f); + + /* Zero fifo count could mean 0 or 32 bytes available. + * If BIT5 of STAR is set then at least 1 byte is available. + */ + if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5)) + fifo_count = 32; + } else + fifo_count = 32; + + tty_buffer_request_room(port, fifo_count); + /* Flush received async data to receive data buffer. */ + while (fifo_count) { + data = read_reg(info, CHA + RXFIFO); + status = read_reg(info, CHA + RXFIFO); + fifo_count -= 2; + + icount->rx++; + flag = TTY_NORMAL; + + // if no frameing/crc error then save data + // BIT7:parity error + // BIT6:framing error + + if (status & (BIT7 + BIT6)) { + if (status & BIT7) + icount->parity++; + else + icount->frame++; + + /* discard char if tty control flags say so */ + if (status & info->ignore_status_mask) + continue; + + status &= info->read_status_mask; + + if (status & BIT7) + flag = TTY_PARITY; + else if (status & BIT6) + flag = TTY_FRAME; + } + work += tty_insert_flip_char(port, data, flag); + } + issue_command(info, CHA, CMD_RXFIFO); + + if (debug_level >= DEBUG_LEVEL_ISR) { + printk("%s(%d):rx_ready_async", + __FILE__,__LINE__); + printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n", + __FILE__,__LINE__,icount->rx,icount->brk, + icount->parity,icount->frame,icount->overrun); + } + + if (work) + tty_flip_buffer_push(port); +} + + +static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty) +{ + if (!info->tx_active) + return; + + info->tx_active = false; + info->tx_aborting = false; + + if (info->params.mode == MGSL_MODE_ASYNC) + return; + + info->tx_count = info->tx_put = info->tx_get = 0; + del_timer(&info->tx_timer); + + if (info->drop_rts_on_tx_done) { + get_signals(info); + if (info->serial_signals & SerialSignal_RTS) { + info->serial_signals &= ~SerialSignal_RTS; + set_signals(info); + } + info->drop_rts_on_tx_done = false; + } + +#if SYNCLINK_GENERIC_HDLC + if (info->netcount) + hdlcdev_tx_done(info); + else +#endif + { + if (tty && (tty->stopped || tty->hw_stopped)) { + tx_stop(info); + return; + } + info->pending_bh |= BH_TRANSMIT; + } +} + +static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty) +{ + unsigned char fifo_count = 32; + int c; + + if (debug_level >= DEBUG_LEVEL_ISR) + printk("%s(%d):tx_ready(%s)\n", __FILE__, __LINE__, info->device_name); + + if (info->params.mode == MGSL_MODE_HDLC) { + if (!info->tx_active) + return; + } else { + if (tty && (tty->stopped || tty->hw_stopped)) { + tx_stop(info); + return; + } + if (!info->tx_count) + info->tx_active = false; + } + + if (!info->tx_count) + return; + + while (info->tx_count && fifo_count) { + c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get))); + + if (c == 1) { + write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get)); + } else { + write_reg16(info, CHA + TXFIFO, + *((unsigned short*)(info->tx_buf + info->tx_get))); + } + info->tx_count -= c; + info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1); + fifo_count -= c; + } + + if (info->params.mode == MGSL_MODE_ASYNC) { + if (info->tx_count < WAKEUP_CHARS) + info->pending_bh |= BH_TRANSMIT; + issue_command(info, CHA, CMD_TXFIFO); + } else { + if (info->tx_count) + issue_command(info, CHA, CMD_TXFIFO); + else + issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM); + } +} + +static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty) +{ + get_signals(info); + if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) + irq_disable(info, CHB, IRQ_CTS); + info->icount.cts++; + if (info->serial_signals & SerialSignal_CTS) + info->input_signal_events.cts_up++; + else + info->input_signal_events.cts_down++; + wake_up_interruptible(&info->status_event_wait_q); + wake_up_interruptible(&info->event_wait_q); + + if (tty && tty_port_cts_enabled(&info->port)) { + if (tty->hw_stopped) { + if (info->serial_signals & SerialSignal_CTS) { + if (debug_level >= DEBUG_LEVEL_ISR) + printk("CTS tx start..."); + tty->hw_stopped = 0; + tx_start(info, tty); + info->pending_bh |= BH_TRANSMIT; + return; + } + } else { + if (!(info->serial_signals & SerialSignal_CTS)) { + if (debug_level >= DEBUG_LEVEL_ISR) + printk("CTS tx stop..."); + tty->hw_stopped = 1; + tx_stop(info); + } + } + } + info->pending_bh |= BH_STATUS; +} + +static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty) +{ + get_signals(info); + if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) + irq_disable(info, CHB, IRQ_DCD); + info->icount.dcd++; + if (info->serial_signals & SerialSignal_DCD) { + info->input_signal_events.dcd_up++; + } + else + info->input_signal_events.dcd_down++; +#if SYNCLINK_GENERIC_HDLC + if (info->netcount) { + if (info->serial_signals & SerialSignal_DCD) + netif_carrier_on(info->netdev); + else + netif_carrier_off(info->netdev); + } +#endif + wake_up_interruptible(&info->status_event_wait_q); + wake_up_interruptible(&info->event_wait_q); + + if (info->port.flags & ASYNC_CHECK_CD) { + if (debug_level >= DEBUG_LEVEL_ISR) + printk("%s CD now %s...", info->device_name, + (info->serial_signals & SerialSignal_DCD) ? "on" : "off"); + if (info->serial_signals & SerialSignal_DCD) + wake_up_interruptible(&info->port.open_wait); + else { + if (debug_level >= DEBUG_LEVEL_ISR) + printk("doing serial hangup..."); + if (tty) + tty_hangup(tty); + } + } + info->pending_bh |= BH_STATUS; +} + +static void dsr_change(MGSLPC_INFO *info) +{ + get_signals(info); + if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) + port_irq_disable(info, PVR_DSR); + info->icount.dsr++; + if (info->serial_signals & SerialSignal_DSR) + info->input_signal_events.dsr_up++; + else + info->input_signal_events.dsr_down++; + wake_up_interruptible(&info->status_event_wait_q); + wake_up_interruptible(&info->event_wait_q); + info->pending_bh |= BH_STATUS; +} + +static void ri_change(MGSLPC_INFO *info) +{ + get_signals(info); + if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) + port_irq_disable(info, PVR_RI); + info->icount.rng++; + if (info->serial_signals & SerialSignal_RI) + info->input_signal_events.ri_up++; + else + info->input_signal_events.ri_down++; + wake_up_interruptible(&info->status_event_wait_q); + wake_up_interruptible(&info->event_wait_q); + info->pending_bh |= BH_STATUS; +} + +/* Interrupt service routine entry point. + * + * Arguments: + * + * irq interrupt number that caused interrupt + * dev_id device ID supplied during interrupt registration + */ +static irqreturn_t mgslpc_isr(int dummy, void *dev_id) +{ + MGSLPC_INFO *info = dev_id; + struct tty_struct *tty; + unsigned short isr; + unsigned char gis, pis; + int count=0; + + if (debug_level >= DEBUG_LEVEL_ISR) + printk("mgslpc_isr(%d) entry.\n", info->irq_level); + + if (!(info->p_dev->_locked)) + return IRQ_HANDLED; + + tty = tty_port_tty_get(&info->port); + + spin_lock(&info->lock); + + while ((gis = read_reg(info, CHA + GIS))) { + if (debug_level >= DEBUG_LEVEL_ISR) + printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis); + + if ((gis & 0x70) || count > 1000) { + printk("synclink_cs:hardware failed or ejected\n"); + break; + } + count++; + + if (gis & (BIT1 | BIT0)) { + isr = read_reg16(info, CHB + ISR); + if (isr & IRQ_DCD) + dcd_change(info, tty); + if (isr & IRQ_CTS) + cts_change(info, tty); + } + if (gis & (BIT3 | BIT2)) + { + isr = read_reg16(info, CHA + ISR); + if (isr & IRQ_TIMER) { + info->irq_occurred = true; + irq_disable(info, CHA, IRQ_TIMER); + } + + /* receive IRQs */ + if (isr & IRQ_EXITHUNT) { + info->icount.exithunt++; + wake_up_interruptible(&info->event_wait_q); + } + if (isr & IRQ_BREAK_ON) { + info->icount.brk++; + if (info->port.flags & ASYNC_SAK) + do_SAK(tty); + } + if (isr & IRQ_RXTIME) { + issue_command(info, CHA, CMD_RXFIFO_READ); + } + if (isr & (IRQ_RXEOM | IRQ_RXFIFO)) { + if (info->params.mode == MGSL_MODE_HDLC) + rx_ready_hdlc(info, isr & IRQ_RXEOM); + else + rx_ready_async(info, isr & IRQ_RXEOM); + } + + /* transmit IRQs */ + if (isr & IRQ_UNDERRUN) { + if (info->tx_aborting) + info->icount.txabort++; + else + info->icount.txunder++; + tx_done(info, tty); + } + else if (isr & IRQ_ALLSENT) { + info->icount.txok++; + tx_done(info, tty); + } + else if (isr & IRQ_TXFIFO) + tx_ready(info, tty); + } + if (gis & BIT7) { + pis = read_reg(info, CHA + PIS); + if (pis & BIT1) + dsr_change(info); + if (pis & BIT2) + ri_change(info); + } + } + + /* Request bottom half processing if there's something + * for it to do and the bh is not already running + */ + + if (info->pending_bh && !info->bh_running && !info->bh_requested) { + if (debug_level >= DEBUG_LEVEL_ISR) + printk("%s(%d):%s queueing bh task.\n", + __FILE__,__LINE__,info->device_name); + schedule_work(&info->task); + info->bh_requested = true; + } + + spin_unlock(&info->lock); + tty_kref_put(tty); + + if (debug_level >= DEBUG_LEVEL_ISR) + printk("%s(%d):mgslpc_isr(%d)exit.\n", + __FILE__, __LINE__, info->irq_level); + + return IRQ_HANDLED; +} + +/* Initialize and start device. + */ +static int startup(MGSLPC_INFO * info, struct tty_struct *tty) +{ + int retval = 0; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):startup(%s)\n", __FILE__, __LINE__, info->device_name); + + if (info->port.flags & ASYNC_INITIALIZED) + return 0; + + if (!info->tx_buf) { + /* allocate a page of memory for a transmit buffer */ + info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL); + if (!info->tx_buf) { + printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n", + __FILE__, __LINE__, info->device_name); + return -ENOMEM; + } + } + + info->pending_bh = 0; + + memset(&info->icount, 0, sizeof(info->icount)); + + setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info); + + /* Allocate and claim adapter resources */ + retval = claim_resources(info); + + /* perform existence check and diagnostics */ + if (!retval) + retval = adapter_test(info); + + if (retval) { + if (capable(CAP_SYS_ADMIN) && tty) + set_bit(TTY_IO_ERROR, &tty->flags); + release_resources(info); + return retval; + } + + /* program hardware for current parameters */ + mgslpc_change_params(info, tty); + + if (tty) + clear_bit(TTY_IO_ERROR, &tty->flags); + + info->port.flags |= ASYNC_INITIALIZED; + + return 0; +} + +/* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware + */ +static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty) +{ + unsigned long flags; + + if (!(info->port.flags & ASYNC_INITIALIZED)) + return; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_shutdown(%s)\n", + __FILE__, __LINE__, info->device_name); + + /* clear status wait queue because status changes */ + /* can't happen after shutting down the hardware */ + wake_up_interruptible(&info->status_event_wait_q); + wake_up_interruptible(&info->event_wait_q); + + del_timer_sync(&info->tx_timer); + + if (info->tx_buf) { + free_page((unsigned long) info->tx_buf); + info->tx_buf = NULL; + } + + spin_lock_irqsave(&info->lock, flags); + + rx_stop(info); + tx_stop(info); + + /* TODO:disable interrupts instead of reset to preserve signal states */ + reset_device(info); + + if (!tty || tty->termios.c_cflag & HUPCL) { + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); + set_signals(info); + } + + spin_unlock_irqrestore(&info->lock, flags); + + release_resources(info); + + if (tty) + set_bit(TTY_IO_ERROR, &tty->flags); + + info->port.flags &= ~ASYNC_INITIALIZED; +} + +static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty) +{ + unsigned long flags; + + spin_lock_irqsave(&info->lock, flags); + + rx_stop(info); + tx_stop(info); + info->tx_count = info->tx_put = info->tx_get = 0; + + if (info->params.mode == MGSL_MODE_HDLC || info->netcount) + hdlc_mode(info); + else + async_mode(info); + + set_signals(info); + + info->dcd_chkcount = 0; + info->cts_chkcount = 0; + info->ri_chkcount = 0; + info->dsr_chkcount = 0; + + irq_enable(info, CHB, IRQ_DCD | IRQ_CTS); + port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI); + get_signals(info); + + if (info->netcount || (tty && (tty->termios.c_cflag & CREAD))) + rx_start(info); + + spin_unlock_irqrestore(&info->lock, flags); +} + +/* Reconfigure adapter based on new parameters + */ +static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty) +{ + unsigned cflag; + int bits_per_char; + + if (!tty) + return; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_change_params(%s)\n", + __FILE__, __LINE__, info->device_name); + + cflag = tty->termios.c_cflag; + + /* if B0 rate (hangup) specified then negate RTS and DTR */ + /* otherwise assert RTS and DTR */ + if (cflag & CBAUD) + info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR; + else + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); + + /* byte size and parity */ + + switch (cflag & CSIZE) { + case CS5: info->params.data_bits = 5; break; + case CS6: info->params.data_bits = 6; break; + case CS7: info->params.data_bits = 7; break; + case CS8: info->params.data_bits = 8; break; + default: info->params.data_bits = 7; break; + } + + if (cflag & CSTOPB) + info->params.stop_bits = 2; + else + info->params.stop_bits = 1; + + info->params.parity = ASYNC_PARITY_NONE; + if (cflag & PARENB) { + if (cflag & PARODD) + info->params.parity = ASYNC_PARITY_ODD; + else + info->params.parity = ASYNC_PARITY_EVEN; +#ifdef CMSPAR + if (cflag & CMSPAR) + info->params.parity = ASYNC_PARITY_SPACE; +#endif + } + + /* calculate number of jiffies to transmit a full + * FIFO (32 bytes) at specified data rate + */ + bits_per_char = info->params.data_bits + + info->params.stop_bits + 1; + + /* if port data rate is set to 460800 or less then + * allow tty settings to override, otherwise keep the + * current data rate. + */ + if (info->params.data_rate <= 460800) { + info->params.data_rate = tty_get_baud_rate(tty); + } + + if (info->params.data_rate) { + info->timeout = (32*HZ*bits_per_char) / + info->params.data_rate; + } + info->timeout += HZ/50; /* Add .02 seconds of slop */ + + if (cflag & CRTSCTS) + info->port.flags |= ASYNC_CTS_FLOW; + else + info->port.flags &= ~ASYNC_CTS_FLOW; + + if (cflag & CLOCAL) + info->port.flags &= ~ASYNC_CHECK_CD; + else + info->port.flags |= ASYNC_CHECK_CD; + + /* process tty input control flags */ + + info->read_status_mask = 0; + if (I_INPCK(tty)) + info->read_status_mask |= BIT7 | BIT6; + if (I_IGNPAR(tty)) + info->ignore_status_mask |= BIT7 | BIT6; + + mgslpc_program_hw(info, tty); +} + +/* Add a character to the transmit buffer + */ +static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch) +{ + MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) { + printk("%s(%d):mgslpc_put_char(%d) on %s\n", + __FILE__, __LINE__, ch, info->device_name); + } + + if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char")) + return 0; + + if (!info->tx_buf) + return 0; + + spin_lock_irqsave(&info->lock, flags); + + if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) { + if (info->tx_count < TXBUFSIZE - 1) { + info->tx_buf[info->tx_put++] = ch; + info->tx_put &= TXBUFSIZE-1; + info->tx_count++; + } + } + + spin_unlock_irqrestore(&info->lock, flags); + return 1; +} + +/* Enable transmitter so remaining characters in the + * transmit buffer are sent. + */ +static void mgslpc_flush_chars(struct tty_struct *tty) +{ + MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n", + __FILE__, __LINE__, info->device_name, info->tx_count); + + if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars")) + return; + + if (info->tx_count <= 0 || tty->stopped || + tty->hw_stopped || !info->tx_buf) + return; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n", + __FILE__, __LINE__, info->device_name); + + spin_lock_irqsave(&info->lock, flags); + if (!info->tx_active) + tx_start(info, tty); + spin_unlock_irqrestore(&info->lock, flags); +} + +/* Send a block of data + * + * Arguments: + * + * tty pointer to tty information structure + * buf pointer to buffer containing send data + * count size of send data in bytes + * + * Returns: number of characters written + */ +static int mgslpc_write(struct tty_struct * tty, + const unsigned char *buf, int count) +{ + int c, ret = 0; + MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_write(%s) count=%d\n", + __FILE__, __LINE__, info->device_name, count); + + if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") || + !info->tx_buf) + goto cleanup; + + if (info->params.mode == MGSL_MODE_HDLC) { + if (count > TXBUFSIZE) { + ret = -EIO; + goto cleanup; + } + if (info->tx_active) + goto cleanup; + else if (info->tx_count) + goto start; + } + + for (;;) { + c = min(count, + min(TXBUFSIZE - info->tx_count - 1, + TXBUFSIZE - info->tx_put)); + if (c <= 0) + break; + + memcpy(info->tx_buf + info->tx_put, buf, c); + + spin_lock_irqsave(&info->lock, flags); + info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1); + info->tx_count += c; + spin_unlock_irqrestore(&info->lock, flags); + + buf += c; + count -= c; + ret += c; + } +start: + if (info->tx_count && !tty->stopped && !tty->hw_stopped) { + spin_lock_irqsave(&info->lock, flags); + if (!info->tx_active) + tx_start(info, tty); + spin_unlock_irqrestore(&info->lock, flags); + } +cleanup: + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_write(%s) returning=%d\n", + __FILE__, __LINE__, info->device_name, ret); + return ret; +} + +/* Return the count of free bytes in transmit buffer + */ +static int mgslpc_write_room(struct tty_struct *tty) +{ + MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; + int ret; + + if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room")) + return 0; + + if (info->params.mode == MGSL_MODE_HDLC) { + /* HDLC (frame oriented) mode */ + if (info->tx_active) + return 0; + else + return HDLC_MAX_FRAME_SIZE; + } else { + ret = TXBUFSIZE - info->tx_count - 1; + if (ret < 0) + ret = 0; + } + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_write_room(%s)=%d\n", + __FILE__, __LINE__, info->device_name, ret); + return ret; +} + +/* Return the count of bytes in transmit buffer + */ +static int mgslpc_chars_in_buffer(struct tty_struct *tty) +{ + MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; + int rc; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_chars_in_buffer(%s)\n", + __FILE__, __LINE__, info->device_name); + + if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer")) + return 0; + + if (info->params.mode == MGSL_MODE_HDLC) + rc = info->tx_active ? info->max_frame_size : 0; + else + rc = info->tx_count; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n", + __FILE__, __LINE__, info->device_name, rc); + + return rc; +} + +/* Discard all data in the send buffer + */ +static void mgslpc_flush_buffer(struct tty_struct *tty) +{ + MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_flush_buffer(%s) entry\n", + __FILE__, __LINE__, info->device_name); + + if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer")) + return; + + spin_lock_irqsave(&info->lock, flags); + info->tx_count = info->tx_put = info->tx_get = 0; + del_timer(&info->tx_timer); + spin_unlock_irqrestore(&info->lock, flags); + + wake_up_interruptible(&tty->write_wait); + tty_wakeup(tty); +} + +/* Send a high-priority XON/XOFF character + */ +static void mgslpc_send_xchar(struct tty_struct *tty, char ch) +{ + MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_send_xchar(%s,%d)\n", + __FILE__, __LINE__, info->device_name, ch); + + if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar")) + return; + + info->x_char = ch; + if (ch) { + spin_lock_irqsave(&info->lock, flags); + if (!info->tx_enabled) + tx_start(info, tty); + spin_unlock_irqrestore(&info->lock, flags); + } +} + +/* Signal remote device to throttle send data (our receive data) + */ +static void mgslpc_throttle(struct tty_struct * tty) +{ + MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_throttle(%s) entry\n", + __FILE__, __LINE__, info->device_name); + + if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle")) + return; + + if (I_IXOFF(tty)) + mgslpc_send_xchar(tty, STOP_CHAR(tty)); + + if (tty->termios.c_cflag & CRTSCTS) { + spin_lock_irqsave(&info->lock, flags); + info->serial_signals &= ~SerialSignal_RTS; + set_signals(info); + spin_unlock_irqrestore(&info->lock, flags); + } +} + +/* Signal remote device to stop throttling send data (our receive data) + */ +static void mgslpc_unthrottle(struct tty_struct * tty) +{ + MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_unthrottle(%s) entry\n", + __FILE__, __LINE__, info->device_name); + + if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle")) + return; + + if (I_IXOFF(tty)) { + if (info->x_char) + info->x_char = 0; + else + mgslpc_send_xchar(tty, START_CHAR(tty)); + } + + if (tty->termios.c_cflag & CRTSCTS) { + spin_lock_irqsave(&info->lock, flags); + info->serial_signals |= SerialSignal_RTS; + set_signals(info); + spin_unlock_irqrestore(&info->lock, flags); + } +} + +/* get the current serial statistics + */ +static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount) +{ + int err; + if (debug_level >= DEBUG_LEVEL_INFO) + printk("get_params(%s)\n", info->device_name); + if (!user_icount) { + memset(&info->icount, 0, sizeof(info->icount)); + } else { + COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount)); + if (err) + return -EFAULT; + } + return 0; +} + +/* get the current serial parameters + */ +static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params) +{ + int err; + if (debug_level >= DEBUG_LEVEL_INFO) + printk("get_params(%s)\n", info->device_name); + COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS)); + if (err) + return -EFAULT; + return 0; +} + +/* set the serial parameters + * + * Arguments: + * + * info pointer to device instance data + * new_params user buffer containing new serial params + * + * Returns: 0 if success, otherwise error code + */ +static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty) +{ + unsigned long flags; + MGSL_PARAMS tmp_params; + int err; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):set_params %s\n", __FILE__,__LINE__, + info->device_name); + COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS)); + if (err) { + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):set_params(%s) user buffer copy failed\n", + __FILE__, __LINE__, info->device_name); + return -EFAULT; + } + + spin_lock_irqsave(&info->lock, flags); + memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS)); + spin_unlock_irqrestore(&info->lock, flags); + + mgslpc_change_params(info, tty); + + return 0; +} + +static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode) +{ + int err; + if (debug_level >= DEBUG_LEVEL_INFO) + printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode); + COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int)); + if (err) + return -EFAULT; + return 0; +} + +static int set_txidle(MGSLPC_INFO * info, int idle_mode) +{ + unsigned long flags; + if (debug_level >= DEBUG_LEVEL_INFO) + printk("set_txidle(%s,%d)\n", info->device_name, idle_mode); + spin_lock_irqsave(&info->lock, flags); + info->idle_mode = idle_mode; + tx_set_idle(info); + spin_unlock_irqrestore(&info->lock, flags); + return 0; +} + +static int get_interface(MGSLPC_INFO * info, int __user *if_mode) +{ + int err; + if (debug_level >= DEBUG_LEVEL_INFO) + printk("get_interface(%s)=%d\n", info->device_name, info->if_mode); + COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int)); + if (err) + return -EFAULT; + return 0; +} + +static int set_interface(MGSLPC_INFO * info, int if_mode) +{ + unsigned long flags; + unsigned char val; + if (debug_level >= DEBUG_LEVEL_INFO) + printk("set_interface(%s,%d)\n", info->device_name, if_mode); + spin_lock_irqsave(&info->lock, flags); + info->if_mode = if_mode; + + val = read_reg(info, PVR) & 0x0f; + switch (info->if_mode) + { + case MGSL_INTERFACE_RS232: val |= PVR_RS232; break; + case MGSL_INTERFACE_V35: val |= PVR_V35; break; + case MGSL_INTERFACE_RS422: val |= PVR_RS422; break; + } + write_reg(info, PVR, val); + + spin_unlock_irqrestore(&info->lock, flags); + return 0; +} + +static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty) +{ + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("set_txenable(%s,%d)\n", info->device_name, enable); + + spin_lock_irqsave(&info->lock, flags); + if (enable) { + if (!info->tx_enabled) + tx_start(info, tty); + } else { + if (info->tx_enabled) + tx_stop(info); + } + spin_unlock_irqrestore(&info->lock, flags); + return 0; +} + +static int tx_abort(MGSLPC_INFO * info) +{ + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("tx_abort(%s)\n", info->device_name); + + spin_lock_irqsave(&info->lock, flags); + if (info->tx_active && info->tx_count && + info->params.mode == MGSL_MODE_HDLC) { + /* clear data count so FIFO is not filled on next IRQ. + * This results in underrun and abort transmission. + */ + info->tx_count = info->tx_put = info->tx_get = 0; + info->tx_aborting = true; + } + spin_unlock_irqrestore(&info->lock, flags); + return 0; +} + +static int set_rxenable(MGSLPC_INFO * info, int enable) +{ + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("set_rxenable(%s,%d)\n", info->device_name, enable); + + spin_lock_irqsave(&info->lock, flags); + if (enable) { + if (!info->rx_enabled) + rx_start(info); + } else { + if (info->rx_enabled) + rx_stop(info); + } + spin_unlock_irqrestore(&info->lock, flags); + return 0; +} + +/* wait for specified event to occur + * + * Arguments: info pointer to device instance data + * mask pointer to bitmask of events to wait for + * Return Value: 0 if successful and bit mask updated with + * of events triggerred, + * otherwise error code + */ +static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr) +{ + unsigned long flags; + int s; + int rc=0; + struct mgsl_icount cprev, cnow; + int events; + int mask; + struct _input_signal_events oldsigs, newsigs; + DECLARE_WAITQUEUE(wait, current); + + COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int)); + if (rc) + return -EFAULT; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("wait_events(%s,%d)\n", info->device_name, mask); + + spin_lock_irqsave(&info->lock, flags); + + /* return immediately if state matches requested events */ + get_signals(info); + s = info->serial_signals; + events = mask & + ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) + + ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) + + ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) + + ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) ); + if (events) { + spin_unlock_irqrestore(&info->lock, flags); + goto exit; + } + + /* save current irq counts */ + cprev = info->icount; + oldsigs = info->input_signal_events; + + if ((info->params.mode == MGSL_MODE_HDLC) && + (mask & MgslEvent_ExitHuntMode)) + irq_enable(info, CHA, IRQ_EXITHUNT); + + set_current_state(TASK_INTERRUPTIBLE); + add_wait_queue(&info->event_wait_q, &wait); + + spin_unlock_irqrestore(&info->lock, flags); + + + for(;;) { + schedule(); + if (signal_pending(current)) { + rc = -ERESTARTSYS; + break; + } + + /* get current irq counts */ + spin_lock_irqsave(&info->lock, flags); + cnow = info->icount; + newsigs = info->input_signal_events; + set_current_state(TASK_INTERRUPTIBLE); + spin_unlock_irqrestore(&info->lock, flags); + + /* if no change, wait aborted for some reason */ + if (newsigs.dsr_up == oldsigs.dsr_up && + newsigs.dsr_down == oldsigs.dsr_down && + newsigs.dcd_up == oldsigs.dcd_up && + newsigs.dcd_down == oldsigs.dcd_down && + newsigs.cts_up == oldsigs.cts_up && + newsigs.cts_down == oldsigs.cts_down && + newsigs.ri_up == oldsigs.ri_up && + newsigs.ri_down == oldsigs.ri_down && + cnow.exithunt == cprev.exithunt && + cnow.rxidle == cprev.rxidle) { + rc = -EIO; + break; + } + + events = mask & + ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) + + (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) + + (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) + + (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) + + (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) + + (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) + + (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) + + (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) + + (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) + + (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) ); + if (events) + break; + + cprev = cnow; + oldsigs = newsigs; + } + + remove_wait_queue(&info->event_wait_q, &wait); + set_current_state(TASK_RUNNING); + + if (mask & MgslEvent_ExitHuntMode) { + spin_lock_irqsave(&info->lock, flags); + if (!waitqueue_active(&info->event_wait_q)) + irq_disable(info, CHA, IRQ_EXITHUNT); + spin_unlock_irqrestore(&info->lock, flags); + } +exit: + if (rc == 0) + PUT_USER(rc, events, mask_ptr); + return rc; +} + +static int modem_input_wait(MGSLPC_INFO *info,int arg) +{ + unsigned long flags; + int rc; + struct mgsl_icount cprev, cnow; + DECLARE_WAITQUEUE(wait, current); + + /* save current irq counts */ + spin_lock_irqsave(&info->lock, flags); + cprev = info->icount; + add_wait_queue(&info->status_event_wait_q, &wait); + set_current_state(TASK_INTERRUPTIBLE); + spin_unlock_irqrestore(&info->lock, flags); + + for(;;) { + schedule(); + if (signal_pending(current)) { + rc = -ERESTARTSYS; + break; + } + + /* get new irq counts */ + spin_lock_irqsave(&info->lock, flags); + cnow = info->icount; + set_current_state(TASK_INTERRUPTIBLE); + spin_unlock_irqrestore(&info->lock, flags); + + /* if no change, wait aborted for some reason */ + if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && + cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) { + rc = -EIO; + break; + } + + /* check for change in caller specified modem input */ + if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) || + (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) || + (arg & TIOCM_CD && cnow.dcd != cprev.dcd) || + (arg & TIOCM_CTS && cnow.cts != cprev.cts)) { + rc = 0; + break; + } + + cprev = cnow; + } + remove_wait_queue(&info->status_event_wait_q, &wait); + set_current_state(TASK_RUNNING); + return rc; +} + +/* return the state of the serial control and status signals + */ +static int tiocmget(struct tty_struct *tty) +{ + MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; + unsigned int result; + unsigned long flags; + + spin_lock_irqsave(&info->lock, flags); + get_signals(info); + spin_unlock_irqrestore(&info->lock, flags); + + result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) + + ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) + + ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) + + ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) + + ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) + + ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0); + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):%s tiocmget() value=%08X\n", + __FILE__, __LINE__, info->device_name, result); + return result; +} + +/* set modem control signals (DTR/RTS) + */ +static int tiocmset(struct tty_struct *tty, + unsigned int set, unsigned int clear) +{ + MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):%s tiocmset(%x,%x)\n", + __FILE__, __LINE__, info->device_name, set, clear); + + if (set & TIOCM_RTS) + info->serial_signals |= SerialSignal_RTS; + if (set & TIOCM_DTR) + info->serial_signals |= SerialSignal_DTR; + if (clear & TIOCM_RTS) + info->serial_signals &= ~SerialSignal_RTS; + if (clear & TIOCM_DTR) + info->serial_signals &= ~SerialSignal_DTR; + + spin_lock_irqsave(&info->lock, flags); + set_signals(info); + spin_unlock_irqrestore(&info->lock, flags); + + return 0; +} + +/* Set or clear transmit break condition + * + * Arguments: tty pointer to tty instance data + * break_state -1=set break condition, 0=clear + */ +static int mgslpc_break(struct tty_struct *tty, int break_state) +{ + MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data; + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_break(%s,%d)\n", + __FILE__, __LINE__, info->device_name, break_state); + + if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break")) + return -EINVAL; + + spin_lock_irqsave(&info->lock, flags); + if (break_state == -1) + set_reg_bits(info, CHA+DAFO, BIT6); + else + clear_reg_bits(info, CHA+DAFO, BIT6); + spin_unlock_irqrestore(&info->lock, flags); + return 0; +} + +static int mgslpc_get_icount(struct tty_struct *tty, + struct serial_icounter_struct *icount) +{ + MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data; + struct mgsl_icount cnow; /* kernel counter temps */ + unsigned long flags; + + spin_lock_irqsave(&info->lock, flags); + cnow = info->icount; + spin_unlock_irqrestore(&info->lock, flags); + + icount->cts = cnow.cts; + icount->dsr = cnow.dsr; + icount->rng = cnow.rng; + icount->dcd = cnow.dcd; + icount->rx = cnow.rx; + icount->tx = cnow.tx; + icount->frame = cnow.frame; + icount->overrun = cnow.overrun; + icount->parity = cnow.parity; + icount->brk = cnow.brk; + icount->buf_overrun = cnow.buf_overrun; + + return 0; +} + +/* Service an IOCTL request + * + * Arguments: + * + * tty pointer to tty instance data + * cmd IOCTL command code + * arg command argument/context + * + * Return Value: 0 if success, otherwise error code + */ +static int mgslpc_ioctl(struct tty_struct *tty, + unsigned int cmd, unsigned long arg) +{ + MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data; + void __user *argp = (void __user *)arg; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__, __LINE__, + info->device_name, cmd); + + if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl")) + return -ENODEV; + + if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && + (cmd != TIOCMIWAIT)) { + if (tty->flags & (1 << TTY_IO_ERROR)) + return -EIO; + } + + switch (cmd) { + case MGSL_IOCGPARAMS: + return get_params(info, argp); + case MGSL_IOCSPARAMS: + return set_params(info, argp, tty); + case MGSL_IOCGTXIDLE: + return get_txidle(info, argp); + case MGSL_IOCSTXIDLE: + return set_txidle(info, (int)arg); + case MGSL_IOCGIF: + return get_interface(info, argp); + case MGSL_IOCSIF: + return set_interface(info,(int)arg); + case MGSL_IOCTXENABLE: + return set_txenable(info,(int)arg, tty); + case MGSL_IOCRXENABLE: + return set_rxenable(info,(int)arg); + case MGSL_IOCTXABORT: + return tx_abort(info); + case MGSL_IOCGSTATS: + return get_stats(info, argp); + case MGSL_IOCWAITEVENT: + return wait_events(info, argp); + case TIOCMIWAIT: + return modem_input_wait(info,(int)arg); + default: + return -ENOIOCTLCMD; + } + return 0; +} + +/* Set new termios settings + * + * Arguments: + * + * tty pointer to tty structure + * termios pointer to buffer to hold returned old termios + */ +static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios) +{ + MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data; + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_set_termios %s\n", __FILE__, __LINE__, + tty->driver->name); + + /* just return if nothing has changed */ + if ((tty->termios.c_cflag == old_termios->c_cflag) + && (RELEVANT_IFLAG(tty->termios.c_iflag) + == RELEVANT_IFLAG(old_termios->c_iflag))) + return; + + mgslpc_change_params(info, tty); + + /* Handle transition to B0 status */ + if (old_termios->c_cflag & CBAUD && + !(tty->termios.c_cflag & CBAUD)) { + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); + spin_lock_irqsave(&info->lock, flags); + set_signals(info); + spin_unlock_irqrestore(&info->lock, flags); + } + + /* Handle transition away from B0 status */ + if (!(old_termios->c_cflag & CBAUD) && + tty->termios.c_cflag & CBAUD) { + info->serial_signals |= SerialSignal_DTR; + if (!(tty->termios.c_cflag & CRTSCTS) || + !test_bit(TTY_THROTTLED, &tty->flags)) { + info->serial_signals |= SerialSignal_RTS; + } + spin_lock_irqsave(&info->lock, flags); + set_signals(info); + spin_unlock_irqrestore(&info->lock, flags); + } + + /* Handle turning off CRTSCTS */ + if (old_termios->c_cflag & CRTSCTS && + !(tty->termios.c_cflag & CRTSCTS)) { + tty->hw_stopped = 0; + tx_release(tty); + } +} + +static void mgslpc_close(struct tty_struct *tty, struct file * filp) +{ + MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data; + struct tty_port *port = &info->port; + + if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close")) + return; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_close(%s) entry, count=%d\n", + __FILE__, __LINE__, info->device_name, port->count); + + if (tty_port_close_start(port, tty, filp) == 0) + goto cleanup; + + if (port->flags & ASYNC_INITIALIZED) + mgslpc_wait_until_sent(tty, info->timeout); + + mgslpc_flush_buffer(tty); + + tty_ldisc_flush(tty); + shutdown(info, tty); + + tty_port_close_end(port, tty); + tty_port_tty_set(port, NULL); +cleanup: + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__, __LINE__, + tty->driver->name, port->count); +} + +/* Wait until the transmitter is empty. + */ +static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout) +{ + MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data; + unsigned long orig_jiffies, char_time; + + if (!info) + return; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n", + __FILE__, __LINE__, info->device_name); + + if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent")) + return; + + if (!(info->port.flags & ASYNC_INITIALIZED)) + goto exit; + + orig_jiffies = jiffies; + + /* Set check interval to 1/5 of estimated time to + * send a character, and make it at least 1. The check + * interval should also be less than the timeout. + * Note: use tight timings here to satisfy the NIST-PCTS. + */ + + if (info->params.data_rate) { + char_time = info->timeout/(32 * 5); + if (!char_time) + char_time++; + } else + char_time = 1; + + if (timeout) + char_time = min_t(unsigned long, char_time, timeout); + + if (info->params.mode == MGSL_MODE_HDLC) { + while (info->tx_active) { + msleep_interruptible(jiffies_to_msecs(char_time)); + if (signal_pending(current)) + break; + if (timeout && time_after(jiffies, orig_jiffies + timeout)) + break; + } + } else { + while ((info->tx_count || info->tx_active) && + info->tx_enabled) { + msleep_interruptible(jiffies_to_msecs(char_time)); + if (signal_pending(current)) + break; + if (timeout && time_after(jiffies, orig_jiffies + timeout)) + break; + } + } + +exit: + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n", + __FILE__, __LINE__, info->device_name); +} + +/* Called by tty_hangup() when a hangup is signaled. + * This is the same as closing all open files for the port. + */ +static void mgslpc_hangup(struct tty_struct *tty) +{ + MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_hangup(%s)\n", + __FILE__, __LINE__, info->device_name); + + if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup")) + return; + + mgslpc_flush_buffer(tty); + shutdown(info, tty); + tty_port_hangup(&info->port); +} + +static int carrier_raised(struct tty_port *port) +{ + MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port); + unsigned long flags; + + spin_lock_irqsave(&info->lock, flags); + get_signals(info); + spin_unlock_irqrestore(&info->lock, flags); + + if (info->serial_signals & SerialSignal_DCD) + return 1; + return 0; +} + +static void dtr_rts(struct tty_port *port, int onoff) +{ + MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port); + unsigned long flags; + + spin_lock_irqsave(&info->lock, flags); + if (onoff) + info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR; + else + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); + set_signals(info); + spin_unlock_irqrestore(&info->lock, flags); +} + + +static int mgslpc_open(struct tty_struct *tty, struct file * filp) +{ + MGSLPC_INFO *info; + struct tty_port *port; + int retval, line; + unsigned long flags; + + /* verify range of specified line number */ + line = tty->index; + if (line >= mgslpc_device_count) { + printk("%s(%d):mgslpc_open with invalid line #%d.\n", + __FILE__, __LINE__, line); + return -ENODEV; + } + + /* find the info structure for the specified line */ + info = mgslpc_device_list; + while(info && info->line != line) + info = info->next_device; + if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open")) + return -ENODEV; + + port = &info->port; + tty->driver_data = info; + tty_port_tty_set(port, tty); + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_open(%s), old ref count = %d\n", + __FILE__, __LINE__, tty->driver->name, port->count); + + /* If port is closing, signal caller to try again */ + if (port->flags & ASYNC_CLOSING){ + wait_event_interruptible_tty(tty, port->close_wait, + !(port->flags & ASYNC_CLOSING)); + retval = ((port->flags & ASYNC_HUP_NOTIFY) ? + -EAGAIN : -ERESTARTSYS); + goto cleanup; + } + + port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; + + spin_lock_irqsave(&info->netlock, flags); + if (info->netcount) { + retval = -EBUSY; + spin_unlock_irqrestore(&info->netlock, flags); + goto cleanup; + } + spin_lock(&port->lock); + port->count++; + spin_unlock(&port->lock); + spin_unlock_irqrestore(&info->netlock, flags); + + if (port->count == 1) { + /* 1st open on this device, init hardware */ + retval = startup(info, tty); + if (retval < 0) + goto cleanup; + } + + retval = tty_port_block_til_ready(&info->port, tty, filp); + if (retval) { + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):block_til_ready(%s) returned %d\n", + __FILE__, __LINE__, info->device_name, retval); + goto cleanup; + } + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):mgslpc_open(%s) success\n", + __FILE__, __LINE__, info->device_name); + retval = 0; + +cleanup: + return retval; +} + +/* + * /proc fs routines.... + */ + +static inline void line_info(struct seq_file *m, MGSLPC_INFO *info) +{ + char stat_buf[30]; + unsigned long flags; + + seq_printf(m, "%s:io:%04X irq:%d", + info->device_name, info->io_base, info->irq_level); + + /* output current serial signal states */ + spin_lock_irqsave(&info->lock, flags); + get_signals(info); + spin_unlock_irqrestore(&info->lock, flags); + + stat_buf[0] = 0; + stat_buf[1] = 0; + if (info->serial_signals & SerialSignal_RTS) + strcat(stat_buf, "|RTS"); + if (info->serial_signals & SerialSignal_CTS) + strcat(stat_buf, "|CTS"); + if (info->serial_signals & SerialSignal_DTR) + strcat(stat_buf, "|DTR"); + if (info->serial_signals & SerialSignal_DSR) + strcat(stat_buf, "|DSR"); + if (info->serial_signals & SerialSignal_DCD) + strcat(stat_buf, "|CD"); + if (info->serial_signals & SerialSignal_RI) + strcat(stat_buf, "|RI"); + + if (info->params.mode == MGSL_MODE_HDLC) { + seq_printf(m, " HDLC txok:%d rxok:%d", + info->icount.txok, info->icount.rxok); + if (info->icount.txunder) + seq_printf(m, " txunder:%d", info->icount.txunder); + if (info->icount.txabort) + seq_printf(m, " txabort:%d", info->icount.txabort); + if (info->icount.rxshort) + seq_printf(m, " rxshort:%d", info->icount.rxshort); + if (info->icount.rxlong) + seq_printf(m, " rxlong:%d", info->icount.rxlong); + if (info->icount.rxover) + seq_printf(m, " rxover:%d", info->icount.rxover); + if (info->icount.rxcrc) + seq_printf(m, " rxcrc:%d", info->icount.rxcrc); + } else { + seq_printf(m, " ASYNC tx:%d rx:%d", + info->icount.tx, info->icount.rx); + if (info->icount.frame) + seq_printf(m, " fe:%d", info->icount.frame); + if (info->icount.parity) + seq_printf(m, " pe:%d", info->icount.parity); + if (info->icount.brk) + seq_printf(m, " brk:%d", info->icount.brk); + if (info->icount.overrun) + seq_printf(m, " oe:%d", info->icount.overrun); + } + + /* Append serial signal status to end */ + seq_printf(m, " %s\n", stat_buf+1); + + seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n", + info->tx_active,info->bh_requested,info->bh_running, + info->pending_bh); +} + +/* Called to print information about devices + */ +static int mgslpc_proc_show(struct seq_file *m, void *v) +{ + MGSLPC_INFO *info; + + seq_printf(m, "synclink driver:%s\n", driver_version); + + info = mgslpc_device_list; + while (info) { + line_info(m, info); + info = info->next_device; + } + return 0; +} + +static int mgslpc_proc_open(struct inode *inode, struct file *file) +{ + return single_open(file, mgslpc_proc_show, NULL); +} + +static const struct file_operations mgslpc_proc_fops = { + .owner = THIS_MODULE, + .open = mgslpc_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int rx_alloc_buffers(MGSLPC_INFO *info) +{ + /* each buffer has header and data */ + info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size; + + /* calculate total allocation size for 8 buffers */ + info->rx_buf_total_size = info->rx_buf_size * 8; + + /* limit total allocated memory */ + if (info->rx_buf_total_size > 0x10000) + info->rx_buf_total_size = 0x10000; + + /* calculate number of buffers */ + info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size; + + info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL); + if (info->rx_buf == NULL) + return -ENOMEM; + + /* unused flag buffer to satisfy receive_buf calling interface */ + info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL); + if (!info->flag_buf) { + kfree(info->rx_buf); + info->rx_buf = NULL; + return -ENOMEM; + } + + rx_reset_buffers(info); + return 0; +} + +static void rx_free_buffers(MGSLPC_INFO *info) +{ + kfree(info->rx_buf); + info->rx_buf = NULL; + kfree(info->flag_buf); + info->flag_buf = NULL; +} + +static int claim_resources(MGSLPC_INFO *info) +{ + if (rx_alloc_buffers(info) < 0) { + printk("Can't allocate rx buffer %s\n", info->device_name); + release_resources(info); + return -ENODEV; + } + return 0; +} + +static void release_resources(MGSLPC_INFO *info) +{ + if (debug_level >= DEBUG_LEVEL_INFO) + printk("release_resources(%s)\n", info->device_name); + rx_free_buffers(info); +} + +/* Add the specified device instance data structure to the + * global linked list of devices and increment the device count. + * + * Arguments: info pointer to device instance data + */ +static int mgslpc_add_device(MGSLPC_INFO *info) +{ + MGSLPC_INFO *current_dev = NULL; + struct device *tty_dev; + int ret; + + info->next_device = NULL; + info->line = mgslpc_device_count; + sprintf(info->device_name,"ttySLP%d",info->line); + + if (info->line < MAX_DEVICE_COUNT) { + if (maxframe[info->line]) + info->max_frame_size = maxframe[info->line]; + } + + mgslpc_device_count++; + + if (!mgslpc_device_list) + mgslpc_device_list = info; + else { + current_dev = mgslpc_device_list; + while (current_dev->next_device) + current_dev = current_dev->next_device; + current_dev->next_device = info; + } + + if (info->max_frame_size < 4096) + info->max_frame_size = 4096; + else if (info->max_frame_size > 65535) + info->max_frame_size = 65535; + + printk("SyncLink PC Card %s:IO=%04X IRQ=%d\n", + info->device_name, info->io_base, info->irq_level); + +#if SYNCLINK_GENERIC_HDLC + ret = hdlcdev_init(info); + if (ret != 0) + goto failed; +#endif + + tty_dev = tty_port_register_device(&info->port, serial_driver, info->line, + &info->p_dev->dev); + if (IS_ERR(tty_dev)) { + ret = PTR_ERR(tty_dev); +#if SYNCLINK_GENERIC_HDLC + hdlcdev_exit(info); +#endif + goto failed; + } + + return 0; + +failed: + if (current_dev) + current_dev->next_device = NULL; + else + mgslpc_device_list = NULL; + mgslpc_device_count--; + return ret; +} + +static void mgslpc_remove_device(MGSLPC_INFO *remove_info) +{ + MGSLPC_INFO *info = mgslpc_device_list; + MGSLPC_INFO *last = NULL; + + while(info) { + if (info == remove_info) { + if (last) + last->next_device = info->next_device; + else + mgslpc_device_list = info->next_device; + tty_unregister_device(serial_driver, info->line); +#if SYNCLINK_GENERIC_HDLC + hdlcdev_exit(info); +#endif + release_resources(info); + tty_port_destroy(&info->port); + kfree(info); + mgslpc_device_count--; + return; + } + last = info; + info = info->next_device; + } +} + +static const struct pcmcia_device_id mgslpc_ids[] = { + PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050), + PCMCIA_DEVICE_NULL +}; +MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids); + +static struct pcmcia_driver mgslpc_driver = { + .owner = THIS_MODULE, + .name = "synclink_cs", + .probe = mgslpc_probe, + .remove = mgslpc_detach, + .id_table = mgslpc_ids, + .suspend = mgslpc_suspend, + .resume = mgslpc_resume, +}; + +static const struct tty_operations mgslpc_ops = { + .open = mgslpc_open, + .close = mgslpc_close, + .write = mgslpc_write, + .put_char = mgslpc_put_char, + .flush_chars = mgslpc_flush_chars, + .write_room = mgslpc_write_room, + .chars_in_buffer = mgslpc_chars_in_buffer, + .flush_buffer = mgslpc_flush_buffer, + .ioctl = mgslpc_ioctl, + .throttle = mgslpc_throttle, + .unthrottle = mgslpc_unthrottle, + .send_xchar = mgslpc_send_xchar, + .break_ctl = mgslpc_break, + .wait_until_sent = mgslpc_wait_until_sent, + .set_termios = mgslpc_set_termios, + .stop = tx_pause, + .start = tx_release, + .hangup = mgslpc_hangup, + .tiocmget = tiocmget, + .tiocmset = tiocmset, + .get_icount = mgslpc_get_icount, + .proc_fops = &mgslpc_proc_fops, +}; + +static int __init synclink_cs_init(void) +{ + int rc; + + if (break_on_load) { + mgslpc_get_text_ptr(); + BREAKPOINT(); + } + + serial_driver = tty_alloc_driver(MAX_DEVICE_COUNT, + TTY_DRIVER_REAL_RAW | + TTY_DRIVER_DYNAMIC_DEV); + if (IS_ERR(serial_driver)) { + rc = PTR_ERR(serial_driver); + goto err; + } + + /* Initialize the tty_driver structure */ + serial_driver->driver_name = "synclink_cs"; + serial_driver->name = "ttySLP"; + serial_driver->major = ttymajor; + serial_driver->minor_start = 64; + serial_driver->type = TTY_DRIVER_TYPE_SERIAL; + serial_driver->subtype = SERIAL_TYPE_NORMAL; + serial_driver->init_termios = tty_std_termios; + serial_driver->init_termios.c_cflag = + B9600 | CS8 | CREAD | HUPCL | CLOCAL; + tty_set_operations(serial_driver, &mgslpc_ops); + + rc = tty_register_driver(serial_driver); + if (rc < 0) { + printk(KERN_ERR "%s(%d):Couldn't register serial driver\n", + __FILE__, __LINE__); + goto err_put_tty; + } + + rc = pcmcia_register_driver(&mgslpc_driver); + if (rc < 0) + goto err_unreg_tty; + + printk(KERN_INFO "%s %s, tty major#%d\n", driver_name, driver_version, + serial_driver->major); + + return 0; +err_unreg_tty: + tty_unregister_driver(serial_driver); +err_put_tty: + put_tty_driver(serial_driver); +err: + return rc; +} + +static void __exit synclink_cs_exit(void) +{ + pcmcia_unregister_driver(&mgslpc_driver); + tty_unregister_driver(serial_driver); + put_tty_driver(serial_driver); +} + +module_init(synclink_cs_init); +module_exit(synclink_cs_exit); + +static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate) +{ + unsigned int M, N; + unsigned char val; + + /* note:standard BRG mode is broken in V3.2 chip + * so enhanced mode is always used + */ + + if (rate) { + N = 3686400 / rate; + if (!N) + N = 1; + N >>= 1; + for (M = 1; N > 64 && M < 16; M++) + N >>= 1; + N--; + + /* BGR[5..0] = N + * BGR[9..6] = M + * BGR[7..0] contained in BGR register + * BGR[9..8] contained in CCR2[7..6] + * divisor = (N+1)*2^M + * + * Note: M *must* not be zero (causes asymetric duty cycle) + */ + write_reg(info, (unsigned char) (channel + BGR), + (unsigned char) ((M << 6) + N)); + val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f; + val |= ((M << 4) & 0xc0); + write_reg(info, (unsigned char) (channel + CCR2), val); + } +} + +/* Enabled the AUX clock output at the specified frequency. + */ +static void enable_auxclk(MGSLPC_INFO *info) +{ + unsigned char val; + + /* MODE + * + * 07..06 MDS[1..0] 10 = transparent HDLC mode + * 05 ADM Address Mode, 0 = no addr recognition + * 04 TMD Timer Mode, 0 = external + * 03 RAC Receiver Active, 0 = inactive + * 02 RTS 0=RTS active during xmit, 1=RTS always active + * 01 TRS Timer Resolution, 1=512 + * 00 TLP Test Loop, 0 = no loop + * + * 1000 0010 + */ + val = 0x82; + + /* channel B RTS is used to enable AUXCLK driver on SP505 */ + if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed) + val |= BIT2; + write_reg(info, CHB + MODE, val); + + /* CCR0 + * + * 07 PU Power Up, 1=active, 0=power down + * 06 MCE Master Clock Enable, 1=enabled + * 05 Reserved, 0 + * 04..02 SC[2..0] Encoding + * 01..00 SM[1..0] Serial Mode, 00=HDLC + * + * 11000000 + */ + write_reg(info, CHB + CCR0, 0xc0); + + /* CCR1 + * + * 07 SFLG Shared Flag, 0 = disable shared flags + * 06 GALP Go Active On Loop, 0 = not used + * 05 GLP Go On Loop, 0 = not used + * 04 ODS Output Driver Select, 1=TxD is push-pull output + * 03 ITF Interframe Time Fill, 0=mark, 1=flag + * 02..00 CM[2..0] Clock Mode + * + * 0001 0111 + */ + write_reg(info, CHB + CCR1, 0x17); + + /* CCR2 (Channel B) + * + * 07..06 BGR[9..8] Baud rate bits 9..8 + * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value + * 04 SSEL Clock source select, 1=submode b + * 03 TOE 0=TxCLK is input, 1=TxCLK is output + * 02 RWX Read/Write Exchange 0=disabled + * 01 C32, CRC select, 0=CRC-16, 1=CRC-32 + * 00 DIV, data inversion 0=disabled, 1=enabled + * + * 0011 1000 + */ + if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed) + write_reg(info, CHB + CCR2, 0x38); + else + write_reg(info, CHB + CCR2, 0x30); + + /* CCR4 + * + * 07 MCK4 Master Clock Divide by 4, 1=enabled + * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled + * 05 TST1 Test Pin, 0=normal operation + * 04 ICD Ivert Carrier Detect, 1=enabled (active low) + * 03..02 Reserved, must be 0 + * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes + * + * 0101 0000 + */ + write_reg(info, CHB + CCR4, 0x50); + + /* if auxclk not enabled, set internal BRG so + * CTS transitions can be detected (requires TxC) + */ + if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed) + mgslpc_set_rate(info, CHB, info->params.clock_speed); + else + mgslpc_set_rate(info, CHB, 921600); +} + +static void loopback_enable(MGSLPC_INFO *info) +{ + unsigned char val; + + /* CCR1:02..00 CM[2..0] Clock Mode = 111 (clock mode 7) */ + val = read_reg(info, CHA + CCR1) | (BIT2 | BIT1 | BIT0); + write_reg(info, CHA + CCR1, val); + + /* CCR2:04 SSEL Clock source select, 1=submode b */ + val = read_reg(info, CHA + CCR2) | (BIT4 | BIT5); + write_reg(info, CHA + CCR2, val); + + /* set LinkSpeed if available, otherwise default to 2Mbps */ + if (info->params.clock_speed) + mgslpc_set_rate(info, CHA, info->params.clock_speed); + else + mgslpc_set_rate(info, CHA, 1843200); + + /* MODE:00 TLP Test Loop, 1=loopback enabled */ + val = read_reg(info, CHA + MODE) | BIT0; + write_reg(info, CHA + MODE, val); +} + +static void hdlc_mode(MGSLPC_INFO *info) +{ + unsigned char val; + unsigned char clkmode, clksubmode; + + /* disable all interrupts */ + irq_disable(info, CHA, 0xffff); + irq_disable(info, CHB, 0xffff); + port_irq_disable(info, 0xff); + + /* assume clock mode 0a, rcv=RxC xmt=TxC */ + clkmode = clksubmode = 0; + if (info->params.flags & HDLC_FLAG_RXC_DPLL + && info->params.flags & HDLC_FLAG_TXC_DPLL) { + /* clock mode 7a, rcv = DPLL, xmt = DPLL */ + clkmode = 7; + } else if (info->params.flags & HDLC_FLAG_RXC_BRG + && info->params.flags & HDLC_FLAG_TXC_BRG) { + /* clock mode 7b, rcv = BRG, xmt = BRG */ + clkmode = 7; + clksubmode = 1; + } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) { + if (info->params.flags & HDLC_FLAG_TXC_BRG) { + /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */ + clkmode = 6; + clksubmode = 1; + } else { + /* clock mode 6a, rcv = DPLL, xmt = TxC */ + clkmode = 6; + } + } else if (info->params.flags & HDLC_FLAG_TXC_BRG) { + /* clock mode 0b, rcv = RxC, xmt = BRG */ + clksubmode = 1; + } + + /* MODE + * + * 07..06 MDS[1..0] 10 = transparent HDLC mode + * 05 ADM Address Mode, 0 = no addr recognition + * 04 TMD Timer Mode, 0 = external + * 03 RAC Receiver Active, 0 = inactive + * 02 RTS 0=RTS active during xmit, 1=RTS always active + * 01 TRS Timer Resolution, 1=512 + * 00 TLP Test Loop, 0 = no loop + * + * 1000 0010 + */ + val = 0x82; + if (info->params.loopback) + val |= BIT0; + + /* preserve RTS state */ + if (info->serial_signals & SerialSignal_RTS) + val |= BIT2; + write_reg(info, CHA + MODE, val); + + /* CCR0 + * + * 07 PU Power Up, 1=active, 0=power down + * 06 MCE Master Clock Enable, 1=enabled + * 05 Reserved, 0 + * 04..02 SC[2..0] Encoding + * 01..00 SM[1..0] Serial Mode, 00=HDLC + * + * 11000000 + */ + val = 0xc0; + switch (info->params.encoding) + { + case HDLC_ENCODING_NRZI: + val |= BIT3; + break; + case HDLC_ENCODING_BIPHASE_SPACE: + val |= BIT4; + break; // FM0 + case HDLC_ENCODING_BIPHASE_MARK: + val |= BIT4 | BIT2; + break; // FM1 + case HDLC_ENCODING_BIPHASE_LEVEL: + val |= BIT4 | BIT3; + break; // Manchester + } + write_reg(info, CHA + CCR0, val); + + /* CCR1 + * + * 07 SFLG Shared Flag, 0 = disable shared flags + * 06 GALP Go Active On Loop, 0 = not used + * 05 GLP Go On Loop, 0 = not used + * 04 ODS Output Driver Select, 1=TxD is push-pull output + * 03 ITF Interframe Time Fill, 0=mark, 1=flag + * 02..00 CM[2..0] Clock Mode + * + * 0001 0000 + */ + val = 0x10 + clkmode; + write_reg(info, CHA + CCR1, val); + + /* CCR2 + * + * 07..06 BGR[9..8] Baud rate bits 9..8 + * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value + * 04 SSEL Clock source select, 1=submode b + * 03 TOE 0=TxCLK is input, 0=TxCLK is input + * 02 RWX Read/Write Exchange 0=disabled + * 01 C32, CRC select, 0=CRC-16, 1=CRC-32 + * 00 DIV, data inversion 0=disabled, 1=enabled + * + * 0000 0000 + */ + val = 0x00; + if (clkmode == 2 || clkmode == 3 || clkmode == 6 + || clkmode == 7 || (clkmode == 0 && clksubmode == 1)) + val |= BIT5; + if (clksubmode) + val |= BIT4; + if (info->params.crc_type == HDLC_CRC_32_CCITT) + val |= BIT1; + if (info->params.encoding == HDLC_ENCODING_NRZB) + val |= BIT0; + write_reg(info, CHA + CCR2, val); + + /* CCR3 + * + * 07..06 PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8 + * 05 EPT Enable preamble transmission, 1=enabled + * 04 RADD Receive address pushed to FIFO, 0=disabled + * 03 CRL CRC Reset Level, 0=FFFF + * 02 RCRC Rx CRC 0=On 1=Off + * 01 TCRC Tx CRC 0=On 1=Off + * 00 PSD DPLL Phase Shift Disable + * + * 0000 0000 + */ + val = 0x00; + if (info->params.crc_type == HDLC_CRC_NONE) + val |= BIT2 | BIT1; + if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE) + val |= BIT5; + switch (info->params.preamble_length) + { + case HDLC_PREAMBLE_LENGTH_16BITS: + val |= BIT6; + break; + case HDLC_PREAMBLE_LENGTH_32BITS: + val |= BIT6; + break; + case HDLC_PREAMBLE_LENGTH_64BITS: + val |= BIT7 | BIT6; + break; + } + write_reg(info, CHA + CCR3, val); + + /* PRE - Preamble pattern */ + val = 0; + switch (info->params.preamble) + { + case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break; + case HDLC_PREAMBLE_PATTERN_10: val = 0xaa; break; + case HDLC_PREAMBLE_PATTERN_01: val = 0x55; break; + case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break; + } + write_reg(info, CHA + PRE, val); + + /* CCR4 + * + * 07 MCK4 Master Clock Divide by 4, 1=enabled + * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled + * 05 TST1 Test Pin, 0=normal operation + * 04 ICD Ivert Carrier Detect, 1=enabled (active low) + * 03..02 Reserved, must be 0 + * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes + * + * 0101 0000 + */ + val = 0x50; + write_reg(info, CHA + CCR4, val); + if (info->params.flags & HDLC_FLAG_RXC_DPLL) + mgslpc_set_rate(info, CHA, info->params.clock_speed * 16); + else + mgslpc_set_rate(info, CHA, info->params.clock_speed); + + /* RLCR Receive length check register + * + * 7 1=enable receive length check + * 6..0 Max frame length = (RL + 1) * 32 + */ + write_reg(info, CHA + RLCR, 0); + + /* XBCH Transmit Byte Count High + * + * 07 DMA mode, 0 = interrupt driven + * 06 NRM, 0=ABM (ignored) + * 05 CAS Carrier Auto Start + * 04 XC Transmit Continuously (ignored) + * 03..00 XBC[10..8] Transmit byte count bits 10..8 + * + * 0000 0000 + */ + val = 0x00; + if (info->params.flags & HDLC_FLAG_AUTO_DCD) + val |= BIT5; + write_reg(info, CHA + XBCH, val); + enable_auxclk(info); + if (info->params.loopback || info->testing_irq) + loopback_enable(info); + if (info->params.flags & HDLC_FLAG_AUTO_CTS) + { + irq_enable(info, CHB, IRQ_CTS); + /* PVR[3] 1=AUTO CTS active */ + set_reg_bits(info, CHA + PVR, BIT3); + } else + clear_reg_bits(info, CHA + PVR, BIT3); + + irq_enable(info, CHA, + IRQ_RXEOM | IRQ_RXFIFO | IRQ_ALLSENT | + IRQ_UNDERRUN | IRQ_TXFIFO); + issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET); + wait_command_complete(info, CHA); + read_reg16(info, CHA + ISR); /* clear pending IRQs */ + + /* Master clock mode enabled above to allow reset commands + * to complete even if no data clocks are present. + * + * Disable master clock mode for normal communications because + * V3.2 of the ESCC2 has a bug that prevents the transmit all sent + * IRQ when in master clock mode. + * + * Leave master clock mode enabled for IRQ test because the + * timer IRQ used by the test can only happen in master clock mode. + */ + if (!info->testing_irq) + clear_reg_bits(info, CHA + CCR0, BIT6); + + tx_set_idle(info); + + tx_stop(info); + rx_stop(info); +} + +static void rx_stop(MGSLPC_INFO *info) +{ + if (debug_level >= DEBUG_LEVEL_ISR) + printk("%s(%d):rx_stop(%s)\n", + __FILE__, __LINE__, info->device_name); + + /* MODE:03 RAC Receiver Active, 0=inactive */ + clear_reg_bits(info, CHA + MODE, BIT3); + + info->rx_enabled = false; + info->rx_overflow = false; +} + +static void rx_start(MGSLPC_INFO *info) +{ + if (debug_level >= DEBUG_LEVEL_ISR) + printk("%s(%d):rx_start(%s)\n", + __FILE__, __LINE__, info->device_name); + + rx_reset_buffers(info); + info->rx_enabled = false; + info->rx_overflow = false; + + /* MODE:03 RAC Receiver Active, 1=active */ + set_reg_bits(info, CHA + MODE, BIT3); + + info->rx_enabled = true; +} + +static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty) +{ + if (debug_level >= DEBUG_LEVEL_ISR) + printk("%s(%d):tx_start(%s)\n", + __FILE__, __LINE__, info->device_name); + + if (info->tx_count) { + /* If auto RTS enabled and RTS is inactive, then assert */ + /* RTS and set a flag indicating that the driver should */ + /* negate RTS when the transmission completes. */ + info->drop_rts_on_tx_done = false; + + if (info->params.flags & HDLC_FLAG_AUTO_RTS) { + get_signals(info); + if (!(info->serial_signals & SerialSignal_RTS)) { + info->serial_signals |= SerialSignal_RTS; + set_signals(info); + info->drop_rts_on_tx_done = true; + } + } + + if (info->params.mode == MGSL_MODE_ASYNC) { + if (!info->tx_active) { + info->tx_active = true; + tx_ready(info, tty); + } + } else { + info->tx_active = true; + tx_ready(info, tty); + mod_timer(&info->tx_timer, jiffies + + msecs_to_jiffies(5000)); + } + } + + if (!info->tx_enabled) + info->tx_enabled = true; +} + +static void tx_stop(MGSLPC_INFO *info) +{ + if (debug_level >= DEBUG_LEVEL_ISR) + printk("%s(%d):tx_stop(%s)\n", + __FILE__, __LINE__, info->device_name); + + del_timer(&info->tx_timer); + + info->tx_enabled = false; + info->tx_active = false; +} + +/* Reset the adapter to a known state and prepare it for further use. + */ +static void reset_device(MGSLPC_INFO *info) +{ + /* power up both channels (set BIT7) */ + write_reg(info, CHA + CCR0, 0x80); + write_reg(info, CHB + CCR0, 0x80); + write_reg(info, CHA + MODE, 0); + write_reg(info, CHB + MODE, 0); + + /* disable all interrupts */ + irq_disable(info, CHA, 0xffff); + irq_disable(info, CHB, 0xffff); + port_irq_disable(info, 0xff); + + /* PCR Port Configuration Register + * + * 07..04 DEC[3..0] Serial I/F select outputs + * 03 output, 1=AUTO CTS control enabled + * 02 RI Ring Indicator input 0=active + * 01 DSR input 0=active + * 00 DTR output 0=active + * + * 0000 0110 + */ + write_reg(info, PCR, 0x06); + + /* PVR Port Value Register + * + * 07..04 DEC[3..0] Serial I/F select (0000=disabled) + * 03 AUTO CTS output 1=enabled + * 02 RI Ring Indicator input + * 01 DSR input + * 00 DTR output (1=inactive) + * + * 0000 0001 + */ +// write_reg(info, PVR, PVR_DTR); + + /* IPC Interrupt Port Configuration + * + * 07 VIS 1=Masked interrupts visible + * 06..05 Reserved, 0 + * 04..03 SLA Slave address, 00 ignored + * 02 CASM Cascading Mode, 1=daisy chain + * 01..00 IC[1..0] Interrupt Config, 01=push-pull output, active low + * + * 0000 0101 + */ + write_reg(info, IPC, 0x05); +} + +static void async_mode(MGSLPC_INFO *info) +{ + unsigned char val; + + /* disable all interrupts */ + irq_disable(info, CHA, 0xffff); + irq_disable(info, CHB, 0xffff); + port_irq_disable(info, 0xff); + + /* MODE + * + * 07 Reserved, 0 + * 06 FRTS RTS State, 0=active + * 05 FCTS Flow Control on CTS + * 04 FLON Flow Control Enable + * 03 RAC Receiver Active, 0 = inactive + * 02 RTS 0=Auto RTS, 1=manual RTS + * 01 TRS Timer Resolution, 1=512 + * 00 TLP Test Loop, 0 = no loop + * + * 0000 0110 + */ + val = 0x06; + if (info->params.loopback) + val |= BIT0; + + /* preserve RTS state */ + if (!(info->serial_signals & SerialSignal_RTS)) + val |= BIT6; + write_reg(info, CHA + MODE, val); + + /* CCR0 + * + * 07 PU Power Up, 1=active, 0=power down + * 06 MCE Master Clock Enable, 1=enabled + * 05 Reserved, 0 + * 04..02 SC[2..0] Encoding, 000=NRZ + * 01..00 SM[1..0] Serial Mode, 11=Async + * + * 1000 0011 + */ + write_reg(info, CHA + CCR0, 0x83); + + /* CCR1 + * + * 07..05 Reserved, 0 + * 04 ODS Output Driver Select, 1=TxD is push-pull output + * 03 BCR Bit Clock Rate, 1=16x + * 02..00 CM[2..0] Clock Mode, 111=BRG + * + * 0001 1111 + */ + write_reg(info, CHA + CCR1, 0x1f); + + /* CCR2 (channel A) + * + * 07..06 BGR[9..8] Baud rate bits 9..8 + * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value + * 04 SSEL Clock source select, 1=submode b + * 03 TOE 0=TxCLK is input, 0=TxCLK is input + * 02 RWX Read/Write Exchange 0=disabled + * 01 Reserved, 0 + * 00 DIV, data inversion 0=disabled, 1=enabled + * + * 0001 0000 + */ + write_reg(info, CHA + CCR2, 0x10); + + /* CCR3 + * + * 07..01 Reserved, 0 + * 00 PSD DPLL Phase Shift Disable + * + * 0000 0000 + */ + write_reg(info, CHA + CCR3, 0); + + /* CCR4 + * + * 07 MCK4 Master Clock Divide by 4, 1=enabled + * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled + * 05 TST1 Test Pin, 0=normal operation + * 04 ICD Ivert Carrier Detect, 1=enabled (active low) + * 03..00 Reserved, must be 0 + * + * 0101 0000 + */ + write_reg(info, CHA + CCR4, 0x50); + mgslpc_set_rate(info, CHA, info->params.data_rate * 16); + + /* DAFO Data Format + * + * 07 Reserved, 0 + * 06 XBRK transmit break, 0=normal operation + * 05 Stop bits (0=1, 1=2) + * 04..03 PAR[1..0] Parity (01=odd, 10=even) + * 02 PAREN Parity Enable + * 01..00 CHL[1..0] Character Length (00=8, 01=7) + * + */ + val = 0x00; + if (info->params.data_bits != 8) + val |= BIT0; /* 7 bits */ + if (info->params.stop_bits != 1) + val |= BIT5; + if (info->params.parity != ASYNC_PARITY_NONE) + { + val |= BIT2; /* Parity enable */ + if (info->params.parity == ASYNC_PARITY_ODD) + val |= BIT3; + else + val |= BIT4; + } + write_reg(info, CHA + DAFO, val); + + /* RFC Rx FIFO Control + * + * 07 Reserved, 0 + * 06 DPS, 1=parity bit not stored in data byte + * 05 DXS, 0=all data stored in FIFO (including XON/XOFF) + * 04 RFDF Rx FIFO Data Format, 1=status byte stored in FIFO + * 03..02 RFTH[1..0], rx threshold, 11=16 status + 16 data byte + * 01 Reserved, 0 + * 00 TCDE Terminate Char Detect Enable, 0=disabled + * + * 0101 1100 + */ + write_reg(info, CHA + RFC, 0x5c); + + /* RLCR Receive length check register + * + * Max frame length = (RL + 1) * 32 + */ + write_reg(info, CHA + RLCR, 0); + + /* XBCH Transmit Byte Count High + * + * 07 DMA mode, 0 = interrupt driven + * 06 NRM, 0=ABM (ignored) + * 05 CAS Carrier Auto Start + * 04 XC Transmit Continuously (ignored) + * 03..00 XBC[10..8] Transmit byte count bits 10..8 + * + * 0000 0000 + */ + val = 0x00; + if (info->params.flags & HDLC_FLAG_AUTO_DCD) + val |= BIT5; + write_reg(info, CHA + XBCH, val); + if (info->params.flags & HDLC_FLAG_AUTO_CTS) + irq_enable(info, CHA, IRQ_CTS); + + /* MODE:03 RAC Receiver Active, 1=active */ + set_reg_bits(info, CHA + MODE, BIT3); + enable_auxclk(info); + if (info->params.flags & HDLC_FLAG_AUTO_CTS) { + irq_enable(info, CHB, IRQ_CTS); + /* PVR[3] 1=AUTO CTS active */ + set_reg_bits(info, CHA + PVR, BIT3); + } else + clear_reg_bits(info, CHA + PVR, BIT3); + irq_enable(info, CHA, + IRQ_RXEOM | IRQ_RXFIFO | IRQ_BREAK_ON | IRQ_RXTIME | + IRQ_ALLSENT | IRQ_TXFIFO); + issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET); + wait_command_complete(info, CHA); + read_reg16(info, CHA + ISR); /* clear pending IRQs */ +} + +/* Set the HDLC idle mode for the transmitter. + */ +static void tx_set_idle(MGSLPC_INFO *info) +{ + /* Note: ESCC2 only supports flags and one idle modes */ + if (info->idle_mode == HDLC_TXIDLE_FLAGS) + set_reg_bits(info, CHA + CCR1, BIT3); + else + clear_reg_bits(info, CHA + CCR1, BIT3); +} + +/* get state of the V24 status (input) signals. + */ +static void get_signals(MGSLPC_INFO *info) +{ + unsigned char status = 0; + + /* preserve RTS and DTR */ + info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR; + + if (read_reg(info, CHB + VSTR) & BIT7) + info->serial_signals |= SerialSignal_DCD; + if (read_reg(info, CHB + STAR) & BIT1) + info->serial_signals |= SerialSignal_CTS; + + status = read_reg(info, CHA + PVR); + if (!(status & PVR_RI)) + info->serial_signals |= SerialSignal_RI; + if (!(status & PVR_DSR)) + info->serial_signals |= SerialSignal_DSR; +} + +/* Set the state of RTS and DTR based on contents of + * serial_signals member of device extension. + */ +static void set_signals(MGSLPC_INFO *info) +{ + unsigned char val; + + val = read_reg(info, CHA + MODE); + if (info->params.mode == MGSL_MODE_ASYNC) { + if (info->serial_signals & SerialSignal_RTS) + val &= ~BIT6; + else + val |= BIT6; + } else { + if (info->serial_signals & SerialSignal_RTS) + val |= BIT2; + else + val &= ~BIT2; + } + write_reg(info, CHA + MODE, val); + + if (info->serial_signals & SerialSignal_DTR) + clear_reg_bits(info, CHA + PVR, PVR_DTR); + else + set_reg_bits(info, CHA + PVR, PVR_DTR); +} + +static void rx_reset_buffers(MGSLPC_INFO *info) +{ + RXBUF *buf; + int i; + + info->rx_put = 0; + info->rx_get = 0; + info->rx_frame_count = 0; + for (i=0 ; i < info->rx_buf_count ; i++) { + buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size)); + buf->status = buf->count = 0; + } +} + +/* Attempt to return a received HDLC frame + * Only frames received without errors are returned. + * + * Returns true if frame returned, otherwise false + */ +static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty) +{ + unsigned short status; + RXBUF *buf; + unsigned int framesize = 0; + unsigned long flags; + bool return_frame = false; + + if (info->rx_frame_count == 0) + return false; + + buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size)); + + status = buf->status; + + /* 07 VFR 1=valid frame + * 06 RDO 1=data overrun + * 05 CRC 1=OK, 0=error + * 04 RAB 1=frame aborted + */ + if ((status & 0xf0) != 0xA0) { + if (!(status & BIT7) || (status & BIT4)) + info->icount.rxabort++; + else if (status & BIT6) + info->icount.rxover++; + else if (!(status & BIT5)) { + info->icount.rxcrc++; + if (info->params.crc_type & HDLC_CRC_RETURN_EX) + return_frame = true; + } + framesize = 0; +#if SYNCLINK_GENERIC_HDLC + { + info->netdev->stats.rx_errors++; + info->netdev->stats.rx_frame_errors++; + } +#endif + } else + return_frame = true; + + if (return_frame) + framesize = buf->count; + + if (debug_level >= DEBUG_LEVEL_BH) + printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n", + __FILE__, __LINE__, info->device_name, status, framesize); + + if (debug_level >= DEBUG_LEVEL_DATA) + trace_block(info, buf->data, framesize, 0); + + if (framesize) { + if ((info->params.crc_type & HDLC_CRC_RETURN_EX && + framesize+1 > info->max_frame_size) || + framesize > info->max_frame_size) + info->icount.rxlong++; + else { + if (status & BIT5) + info->icount.rxok++; + + if (info->params.crc_type & HDLC_CRC_RETURN_EX) { + *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR; + ++framesize; + } + +#if SYNCLINK_GENERIC_HDLC + if (info->netcount) + hdlcdev_rx(info, buf->data, framesize); + else +#endif + ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize); + } + } + + spin_lock_irqsave(&info->lock, flags); + buf->status = buf->count = 0; + info->rx_frame_count--; + info->rx_get++; + if (info->rx_get >= info->rx_buf_count) + info->rx_get = 0; + spin_unlock_irqrestore(&info->lock, flags); + + return true; +} + +static bool register_test(MGSLPC_INFO *info) +{ + static unsigned char patterns[] = + { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f }; + static unsigned int count = ARRAY_SIZE(patterns); + unsigned int i; + bool rc = true; + unsigned long flags; + + spin_lock_irqsave(&info->lock, flags); + reset_device(info); + + for (i = 0; i < count; i++) { + write_reg(info, XAD1, patterns[i]); + write_reg(info, XAD2, patterns[(i + 1) % count]); + if ((read_reg(info, XAD1) != patterns[i]) || + (read_reg(info, XAD2) != patterns[(i + 1) % count])) { + rc = false; + break; + } + } + + spin_unlock_irqrestore(&info->lock, flags); + return rc; +} + +static bool irq_test(MGSLPC_INFO *info) +{ + unsigned long end_time; + unsigned long flags; + + spin_lock_irqsave(&info->lock, flags); + reset_device(info); + + info->testing_irq = true; + hdlc_mode(info); + + info->irq_occurred = false; + + /* init hdlc mode */ + + irq_enable(info, CHA, IRQ_TIMER); + write_reg(info, CHA + TIMR, 0); /* 512 cycles */ + issue_command(info, CHA, CMD_START_TIMER); + + spin_unlock_irqrestore(&info->lock, flags); + + end_time=100; + while(end_time-- && !info->irq_occurred) { + msleep_interruptible(10); + } + + info->testing_irq = false; + + spin_lock_irqsave(&info->lock, flags); + reset_device(info); + spin_unlock_irqrestore(&info->lock, flags); + + return info->irq_occurred; +} + +static int adapter_test(MGSLPC_INFO *info) +{ + if (!register_test(info)) { + info->init_error = DiagStatus_AddressFailure; + printk("%s(%d):Register test failure for device %s Addr=%04X\n", + __FILE__, __LINE__, info->device_name, (unsigned short)(info->io_base)); + return -ENODEV; + } + + if (!irq_test(info)) { + info->init_error = DiagStatus_IrqFailure; + printk("%s(%d):Interrupt test failure for device %s IRQ=%d\n", + __FILE__, __LINE__, info->device_name, (unsigned short)(info->irq_level)); + return -ENODEV; + } + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):device %s passed diagnostics\n", + __FILE__, __LINE__, info->device_name); + return 0; +} + +static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit) +{ + int i; + int linecount; + if (xmit) + printk("%s tx data:\n", info->device_name); + else + printk("%s rx data:\n", info->device_name); + + while(count) { + if (count > 16) + linecount = 16; + else + linecount = count; + + for(i=0;i<linecount;i++) + printk("%02X ", (unsigned char)data[i]); + for(;i<17;i++) + printk(" "); + for(i=0;i<linecount;i++) { + if (data[i]>=040 && data[i]<=0176) + printk("%c", data[i]); + else + printk("."); + } + printk("\n"); + + data += linecount; + count -= linecount; + } +} + +/* HDLC frame time out + * update stats and do tx completion processing + */ +static void tx_timeout(unsigned long context) +{ + MGSLPC_INFO *info = (MGSLPC_INFO*)context; + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s(%d):tx_timeout(%s)\n", + __FILE__, __LINE__, info->device_name); + if (info->tx_active && + info->params.mode == MGSL_MODE_HDLC) { + info->icount.txtimeout++; + } + spin_lock_irqsave(&info->lock, flags); + info->tx_active = false; + info->tx_count = info->tx_put = info->tx_get = 0; + + spin_unlock_irqrestore(&info->lock, flags); + +#if SYNCLINK_GENERIC_HDLC + if (info->netcount) + hdlcdev_tx_done(info); + else +#endif + { + struct tty_struct *tty = tty_port_tty_get(&info->port); + bh_transmit(info, tty); + tty_kref_put(tty); + } +} + +#if SYNCLINK_GENERIC_HDLC + +/** + * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.) + * set encoding and frame check sequence (FCS) options + * + * dev pointer to network device structure + * encoding serial encoding setting + * parity FCS setting + * + * returns 0 if success, otherwise error code + */ +static int hdlcdev_attach(struct net_device *dev, unsigned short encoding, + unsigned short parity) +{ + MGSLPC_INFO *info = dev_to_port(dev); + struct tty_struct *tty; + unsigned char new_encoding; + unsigned short new_crctype; + + /* return error if TTY interface open */ + if (info->port.count) + return -EBUSY; + + switch (encoding) + { + case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break; + case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break; + case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break; + case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break; + case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break; + default: return -EINVAL; + } + + switch (parity) + { + case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break; + case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break; + case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break; + default: return -EINVAL; + } + + info->params.encoding = new_encoding; + info->params.crc_type = new_crctype; + + /* if network interface up, reprogram hardware */ + if (info->netcount) { + tty = tty_port_tty_get(&info->port); + mgslpc_program_hw(info, tty); + tty_kref_put(tty); + } + + return 0; +} + +/** + * called by generic HDLC layer to send frame + * + * skb socket buffer containing HDLC frame + * dev pointer to network device structure + */ +static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + MGSLPC_INFO *info = dev_to_port(dev); + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk(KERN_INFO "%s:hdlc_xmit(%s)\n", __FILE__, dev->name); + + /* stop sending until this frame completes */ + netif_stop_queue(dev); + + /* copy data to device buffers */ + skb_copy_from_linear_data(skb, info->tx_buf, skb->len); + info->tx_get = 0; + info->tx_put = info->tx_count = skb->len; + + /* update network statistics */ + dev->stats.tx_packets++; + dev->stats.tx_bytes += skb->len; + + /* done with socket buffer, so free it */ + dev_kfree_skb(skb); + + /* save start time for transmit timeout detection */ + dev->trans_start = jiffies; + + /* start hardware transmitter if necessary */ + spin_lock_irqsave(&info->lock, flags); + if (!info->tx_active) { + struct tty_struct *tty = tty_port_tty_get(&info->port); + tx_start(info, tty); + tty_kref_put(tty); + } + spin_unlock_irqrestore(&info->lock, flags); + + return NETDEV_TX_OK; +} + +/** + * called by network layer when interface enabled + * claim resources and initialize hardware + * + * dev pointer to network device structure + * + * returns 0 if success, otherwise error code + */ +static int hdlcdev_open(struct net_device *dev) +{ + MGSLPC_INFO *info = dev_to_port(dev); + struct tty_struct *tty; + int rc; + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s:hdlcdev_open(%s)\n", __FILE__, dev->name); + + /* generic HDLC layer open processing */ + rc = hdlc_open(dev); + if (rc != 0) + return rc; + + /* arbitrate between network and tty opens */ + spin_lock_irqsave(&info->netlock, flags); + if (info->port.count != 0 || info->netcount != 0) { + printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name); + spin_unlock_irqrestore(&info->netlock, flags); + return -EBUSY; + } + info->netcount=1; + spin_unlock_irqrestore(&info->netlock, flags); + + tty = tty_port_tty_get(&info->port); + /* claim resources and init adapter */ + rc = startup(info, tty); + if (rc != 0) { + tty_kref_put(tty); + spin_lock_irqsave(&info->netlock, flags); + info->netcount=0; + spin_unlock_irqrestore(&info->netlock, flags); + return rc; + } + /* assert RTS and DTR, apply hardware settings */ + info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR; + mgslpc_program_hw(info, tty); + tty_kref_put(tty); + + /* enable network layer transmit */ + dev->trans_start = jiffies; + netif_start_queue(dev); + + /* inform generic HDLC layer of current DCD status */ + spin_lock_irqsave(&info->lock, flags); + get_signals(info); + spin_unlock_irqrestore(&info->lock, flags); + if (info->serial_signals & SerialSignal_DCD) + netif_carrier_on(dev); + else + netif_carrier_off(dev); + return 0; +} + +/** + * called by network layer when interface is disabled + * shutdown hardware and release resources + * + * dev pointer to network device structure + * + * returns 0 if success, otherwise error code + */ +static int hdlcdev_close(struct net_device *dev) +{ + MGSLPC_INFO *info = dev_to_port(dev); + struct tty_struct *tty = tty_port_tty_get(&info->port); + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s:hdlcdev_close(%s)\n", __FILE__, dev->name); + + netif_stop_queue(dev); + + /* shutdown adapter and release resources */ + shutdown(info, tty); + tty_kref_put(tty); + hdlc_close(dev); + + spin_lock_irqsave(&info->netlock, flags); + info->netcount=0; + spin_unlock_irqrestore(&info->netlock, flags); + + return 0; +} + +/** + * called by network layer to process IOCTL call to network device + * + * dev pointer to network device structure + * ifr pointer to network interface request structure + * cmd IOCTL command code + * + * returns 0 if success, otherwise error code + */ +static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) +{ + const size_t size = sizeof(sync_serial_settings); + sync_serial_settings new_line; + sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync; + MGSLPC_INFO *info = dev_to_port(dev); + unsigned int flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("%s:hdlcdev_ioctl(%s)\n", __FILE__, dev->name); + + /* return error if TTY interface open */ + if (info->port.count) + return -EBUSY; + + if (cmd != SIOCWANDEV) + return hdlc_ioctl(dev, ifr, cmd); + + memset(&new_line, 0, size); + + switch(ifr->ifr_settings.type) { + case IF_GET_IFACE: /* return current sync_serial_settings */ + + ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL; + if (ifr->ifr_settings.size < size) { + ifr->ifr_settings.size = size; /* data size wanted */ + return -ENOBUFS; + } + + flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | + HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | + HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | + HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); + + switch (flags){ + case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break; + case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break; + case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break; + case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break; + default: new_line.clock_type = CLOCK_DEFAULT; + } + + new_line.clock_rate = info->params.clock_speed; + new_line.loopback = info->params.loopback ? 1:0; + + if (copy_to_user(line, &new_line, size)) + return -EFAULT; + return 0; + + case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */ + + if(!capable(CAP_NET_ADMIN)) + return -EPERM; + if (copy_from_user(&new_line, line, size)) + return -EFAULT; + + switch (new_line.clock_type) + { + case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break; + case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break; + case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break; + case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break; + case CLOCK_DEFAULT: flags = info->params.flags & + (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | + HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | + HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | + HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break; + default: return -EINVAL; + } + + if (new_line.loopback != 0 && new_line.loopback != 1) + return -EINVAL; + + info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | + HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | + HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | + HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); + info->params.flags |= flags; + + info->params.loopback = new_line.loopback; + + if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG)) + info->params.clock_speed = new_line.clock_rate; + else + info->params.clock_speed = 0; + + /* if network interface up, reprogram hardware */ + if (info->netcount) { + struct tty_struct *tty = tty_port_tty_get(&info->port); + mgslpc_program_hw(info, tty); + tty_kref_put(tty); + } + return 0; + + default: + return hdlc_ioctl(dev, ifr, cmd); + } +} + +/** + * called by network layer when transmit timeout is detected + * + * dev pointer to network device structure + */ +static void hdlcdev_tx_timeout(struct net_device *dev) +{ + MGSLPC_INFO *info = dev_to_port(dev); + unsigned long flags; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("hdlcdev_tx_timeout(%s)\n", dev->name); + + dev->stats.tx_errors++; + dev->stats.tx_aborted_errors++; + + spin_lock_irqsave(&info->lock, flags); + tx_stop(info); + spin_unlock_irqrestore(&info->lock, flags); + + netif_wake_queue(dev); +} + +/** + * called by device driver when transmit completes + * reenable network layer transmit if stopped + * + * info pointer to device instance information + */ +static void hdlcdev_tx_done(MGSLPC_INFO *info) +{ + if (netif_queue_stopped(info->netdev)) + netif_wake_queue(info->netdev); +} + +/** + * called by device driver when frame received + * pass frame to network layer + * + * info pointer to device instance information + * buf pointer to buffer contianing frame data + * size count of data bytes in buf + */ +static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size) +{ + struct sk_buff *skb = dev_alloc_skb(size); + struct net_device *dev = info->netdev; + + if (debug_level >= DEBUG_LEVEL_INFO) + printk("hdlcdev_rx(%s)\n", dev->name); + + if (skb == NULL) { + printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name); + dev->stats.rx_dropped++; + return; + } + + memcpy(skb_put(skb, size), buf, size); + + skb->protocol = hdlc_type_trans(skb, dev); + + dev->stats.rx_packets++; + dev->stats.rx_bytes += size; + + netif_rx(skb); +} + +static const struct net_device_ops hdlcdev_ops = { + .ndo_open = hdlcdev_open, + .ndo_stop = hdlcdev_close, + .ndo_change_mtu = hdlc_change_mtu, + .ndo_start_xmit = hdlc_start_xmit, + .ndo_do_ioctl = hdlcdev_ioctl, + .ndo_tx_timeout = hdlcdev_tx_timeout, +}; + +/** + * called by device driver when adding device instance + * do generic HDLC initialization + * + * info pointer to device instance information + * + * returns 0 if success, otherwise error code + */ +static int hdlcdev_init(MGSLPC_INFO *info) +{ + int rc; + struct net_device *dev; + hdlc_device *hdlc; + + /* allocate and initialize network and HDLC layer objects */ + + dev = alloc_hdlcdev(info); + if (dev == NULL) { + printk(KERN_ERR "%s:hdlc device allocation failure\n", __FILE__); + return -ENOMEM; + } + + /* for network layer reporting purposes only */ + dev->base_addr = info->io_base; + dev->irq = info->irq_level; + + /* network layer callbacks and settings */ + dev->netdev_ops = &hdlcdev_ops; + dev->watchdog_timeo = 10 * HZ; + dev->tx_queue_len = 50; + + /* generic HDLC layer callbacks and settings */ + hdlc = dev_to_hdlc(dev); + hdlc->attach = hdlcdev_attach; + hdlc->xmit = hdlcdev_xmit; + + /* register objects with HDLC layer */ + rc = register_hdlc_device(dev); + if (rc) { + printk(KERN_WARNING "%s:unable to register hdlc device\n", __FILE__); + free_netdev(dev); + return rc; + } + + info->netdev = dev; + return 0; +} + +/** + * called by device driver when removing device instance + * do generic HDLC cleanup + * + * info pointer to device instance information + */ +static void hdlcdev_exit(MGSLPC_INFO *info) +{ + unregister_hdlc_device(info->netdev); + free_netdev(info->netdev); + info->netdev = NULL; +} + +#endif /* CONFIG_HDLC */ + |