/* * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $ * * Device driver for Microgate SyncLink Multiport * high speed multiprotocol serial adapter. * * written by Paul Fulghum for Microgate Corporation * paulkf@microgate.com * * Microgate and SyncLink are trademarks of Microgate Corporation * * Derived from serial.c written by Theodore Ts'o and Linus Torvalds * 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_DEVICES 12 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_HDLC_MODULE #define CONFIG_HDLC 1 #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 #include "linux/synclink.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; */ }; /* size in bytes of DMA data buffers */ #define SCABUFSIZE 1024 #define SCA_MEM_SIZE 0x40000 #define SCA_BASE_SIZE 512 #define SCA_REG_SIZE 16 #define SCA_MAX_PORTS 4 #define SCAMAXDESC 128 #define BUFFERLISTSIZE 4096 /* SCA-I style DMA buffer descriptor */ typedef struct _SCADESC { u16 next; /* lower l6 bits of next descriptor addr */ u16 buf_ptr; /* lower 16 bits of buffer addr */ u8 buf_base; /* upper 8 bits of buffer addr */ u8 pad1; u16 length; /* length of buffer */ u8 status; /* status of buffer */ u8 pad2; } SCADESC, *PSCADESC; typedef struct _SCADESC_EX { /* device driver bookkeeping section */ char *virt_addr; /* virtual address of data buffer */ u16 phys_entry; /* lower 16-bits of physical address of this descriptor */ } SCADESC_EX, *PSCADESC_EX; /* 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 _synclinkmp_info { void *if_ptr; /* General purpose pointer (used by SPPP) */ int magic; int flags; int count; /* count of opens */ int line; unsigned short close_delay; unsigned short closing_wait; /* time to wait before closing */ struct mgsl_icount icount; struct tty_struct *tty; int timeout; int x_char; /* xon/xoff character */ int blocked_open; /* # of blocked opens */ u16 read_status_mask1; /* break detection (SR1 indications) */ u16 read_status_mask2; /* parity/framing/overun (SR2 indications) */ unsigned char ignore_status_mask1; /* break detection (SR1 indications) */ unsigned char ignore_status_mask2; /* parity/framing/overun (SR2 indications) */ unsigned char *tx_buf; int tx_put; int tx_get; int tx_count; wait_queue_head_t open_wait; wait_queue_head_t close_wait; 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 _synclinkmp_info *next_device; /* device list link */ struct timer_list status_timer; /* input signal status check timer */ spinlock_t lock; /* spinlock for synchronizing with ISR */ struct work_struct task; /* task structure for scheduling bh */ u32 max_frame_size; /* as set by device config */ u32 pending_bh; int bh_running; /* Protection from multiple */ int isr_overflow; int 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; char *buffer_list; /* virtual address of Rx & Tx buffer lists */ unsigned long buffer_list_phys; unsigned int rx_buf_count; /* count of total allocated Rx buffers */ SCADESC *rx_buf_list; /* list of receive buffer entries */ SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */ unsigned int current_rx_buf; unsigned int tx_buf_count; /* count of total allocated Tx buffers */ SCADESC *tx_buf_list; /* list of transmit buffer entries */ SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */ unsigned int last_tx_buf; unsigned char *tmp_rx_buf; unsigned int tmp_rx_buf_count; int rx_enabled; int rx_overflow; int tx_enabled; int tx_active; u32 idle_mode; unsigned char ie0_value; unsigned char ie1_value; unsigned char ie2_value; unsigned char ctrlreg_value; unsigned char old_signals; char device_name[25]; /* device instance name */ int port_count; int adapter_num; int port_num; struct _synclinkmp_info *port_array[SCA_MAX_PORTS]; unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */ unsigned int irq_level; /* interrupt level */ unsigned long irq_flags; int irq_requested; /* nonzero if IRQ requested */ MGSL_PARAMS params; /* communications parameters */ unsigned char serial_signals; /* current serial signal states */ int irq_occurred; /* for diagnostics use */ unsigned int init_error; /* Initialization startup error */ u32 last_mem_alloc; unsigned char* memory_base; /* shared memory address (PCI only) */ u32 phys_memory_base; int shared_mem_requested; unsigned char* sca_base; /* HD64570 SCA Memory address */ u32 phys_sca_base; u32 sca_offset; int sca_base_requested; unsigned char* lcr_base; /* local config registers (PCI only) */ u32 phys_lcr_base; u32 lcr_offset; int lcr_mem_requested; unsigned char* statctrl_base; /* status/control register memory */ u32 phys_statctrl_base; u32 statctrl_offset; int sca_statctrl_requested; u32 misc_ctrl_value; char flag_buf[MAX_ASYNC_BUFFER_SIZE]; char char_buf[MAX_ASYNC_BUFFER_SIZE]; BOOLEAN drop_rts_on_tx_done; struct _input_signal_events input_signal_events; /* SPPP/Cisco HDLC device parts */ int netcount; int dosyncppp; spinlock_t netlock; #ifdef CONFIG_HDLC struct net_device *netdev; #endif } SLMP_INFO; #define MGSL_MAGIC 0x5401 /* * define serial signal status change macros */ #define MISCSTATUS_DCD_LATCHED (SerialSignal_DCD<<8) /* indicates change in DCD */ #define MISCSTATUS_RI_LATCHED (SerialSignal_RI<<8) /* indicates change in RI */ #define MISCSTATUS_CTS_LATCHED (SerialSignal_CTS<<8) /* indicates change in CTS */ #define MISCSTATUS_DSR_LATCHED (SerialSignal_DSR<<8) /* change in DSR */ /* Common Register macros */ #define LPR 0x00 #define PABR0 0x02 #define PABR1 0x03 #define WCRL 0x04 #define WCRM 0x05 #define WCRH 0x06 #define DPCR 0x08 #define DMER 0x09 #define ISR0 0x10 #define ISR1 0x11 #define ISR2 0x12 #define IER0 0x14 #define IER1 0x15 #define IER2 0x16 #define ITCR 0x18 #define INTVR 0x1a #define IMVR 0x1c /* MSCI Register macros */ #define TRB 0x20 #define TRBL 0x20 #define TRBH 0x21 #define SR0 0x22 #define SR1 0x23 #define SR2 0x24 #define SR3 0x25 #define FST 0x26 #define IE0 0x28 #define IE1 0x29 #define IE2 0x2a #define FIE 0x2b #define CMD 0x2c #define MD0 0x2e #define MD1 0x2f #define MD2 0x30 #define CTL 0x31 #define SA0 0x32 #define SA1 0x33 #define IDL 0x34 #define TMC 0x35 #define RXS 0x36 #define TXS 0x37 #define TRC0 0x38 #define TRC1 0x39 #define RRC 0x3a #define CST0 0x3c #define CST1 0x3d /* Timer Register Macros */ #define TCNT 0x60 #define TCNTL 0x60 #define TCNTH 0x61 #define TCONR 0x62 #define TCONRL 0x62 #define TCONRH 0x63 #define TMCS 0x64 #define TEPR 0x65 /* DMA Controller Register macros */ #define DARL 0x80 #define DARH 0x81 #define DARB 0x82 #define BAR 0x80 #define BARL 0x80 #define BARH 0x81 #define BARB 0x82 #define SAR 0x84 #define SARL 0x84 #define SARH 0x85 #define SARB 0x86 #define CPB 0x86 #define CDA 0x88 #define CDAL 0x88 #define CDAH 0x89 #define EDA 0x8a #define EDAL 0x8a #define EDAH 0x8b #define BFL 0x8c #define BFLL 0x8c #define BFLH 0x8d #define BCR 0x8e #define BCRL 0x8e #define BCRH 0x8f #define DSR 0x90 #define DMR 0x91 #define FCT 0x93 #define DIR 0x94 #define DCMD 0x95 /* combine with timer or DMA register address */ #define TIMER0 0x00 #define TIMER1 0x08 #define TIMER2 0x10 #define TIMER3 0x18 #define RXDMA 0x00 #define TXDMA 0x20 /* SCA Command Codes */ #define NOOP 0x00 #define TXRESET 0x01 #define TXENABLE 0x02 #define TXDISABLE 0x03 #define TXCRCINIT 0x04 #define TXCRCEXCL 0x05 #define TXEOM 0x06 #define TXABORT 0x07 #define MPON 0x08 #define TXBUFCLR 0x09 #define RXRESET 0x11 #define RXENABLE 0x12 #define RXDISABLE 0x13 #define RXCRCINIT 0x14 #define RXREJECT 0x15 #define SEARCHMP 0x16 #define RXCRCEXCL 0x17 #define RXCRCCALC 0x18 #define CHRESET 0x21 #define HUNT 0x31 /* DMA command codes */ #define SWABORT 0x01 #define FEICLEAR 0x02 /* IE0 */ #define TXINTE BIT7 #define RXINTE BIT6 #define TXRDYE BIT1 #define RXRDYE BIT0 /* IE1 & SR1 */ #define UDRN BIT7 #define IDLE BIT6 #define SYNCD BIT4 #define FLGD BIT4 #define CCTS BIT3 #define CDCD BIT2 #define BRKD BIT1 #define ABTD BIT1 #define GAPD BIT1 #define BRKE BIT0 #define IDLD BIT0 /* IE2 & SR2 */ #define EOM BIT7 #define PMP BIT6 #define SHRT BIT6 #define PE BIT5 #define ABT BIT5 #define FRME BIT4 #define RBIT BIT4 #define OVRN BIT3 #define CRCE BIT2 /* * Global linked list of SyncLink devices */ static SLMP_INFO *synclinkmp_device_list = NULL; static int synclinkmp_adapter_count = -1; static int synclinkmp_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 int 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; /* * Array of user specified options for ISA adapters. */ static int debug_level = 0; static int maxframe[MAX_DEVICES] = {0,}; static int dosyncppp[MAX_DEVICES] = {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_param_array(dosyncppp, int, NULL, 0); static char *driver_name = "SyncLink MultiPort driver"; static char *driver_version = "$Revision: 4.38 $"; static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent); static void synclinkmp_remove_one(struct pci_dev *dev); static struct pci_device_id synclinkmp_pci_tbl[] = { { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, }, { 0, }, /* terminate list */ }; MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl); MODULE_LICENSE("GPL"); static struct pci_driver synclinkmp_pci_driver = { .name = "synclinkmp", .id_table = synclinkmp_pci_tbl, .probe = synclinkmp_init_one, .remove = __devexit_p(synclinkmp_remove_one), }; static struct tty_driver *serial_driver; /* number of characters left in xmit buffer before we ask for more */ #define WAKEUP_CHARS 256 /* tty callbacks */ static int open(struct tty_struct *tty, struct file * filp); static void close(struct tty_struct *tty, struct file * filp); static void hangup(struct tty_struct *tty); static void set_termios(struct tty_struct *tty, struct termios *old_termios); static int write(struct tty_struct *tty, const unsigned char *buf, int count); static void put_char(struct tty_struct *tty, unsigned char ch); static void send_xchar(struct tty_struct *tty, char ch); static void wait_until_sent(struct tty_struct *tty, int timeout); static int write_room(struct tty_struct *tty); static void flush_chars(struct tty_struct *tty); static void flush_buffer(struct tty_struct *tty); static void tx_hold(struct tty_struct *tty); static void tx_release(struct tty_struct *tty); static int ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg); static int read_proc(char *page, char **start, off_t off, int count,int *eof, void *data); static int chars_in_buffer(struct tty_struct *tty); static void throttle(struct tty_struct * tty); static void unthrottle(struct tty_struct * tty); static void set_break(struct tty_struct *tty, int break_state); #ifdef CONFIG_HDLC #define dev_to_port(D) (dev_to_hdlc(D)->priv) static void hdlcdev_tx_done(SLMP_INFO *info); static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size); static int hdlcdev_init(SLMP_INFO *info); static void hdlcdev_exit(SLMP_INFO *info); #endif /* ioctl handlers */ static int get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount); static int get_params(SLMP_INFO *info, MGSL_PARAMS __user *params); static int set_params(SLMP_INFO *info, MGSL_PARAMS __user *params); static int get_txidle(SLMP_INFO *info, int __user *idle_mode); static int set_txidle(SLMP_INFO *info, int idle_mode); static int tx_enable(SLMP_INFO *info, int enable); static int tx_abort(SLMP_INFO *info); static int rx_enable(SLMP_INFO *info, int enable); static int modem_input_wait(SLMP_INFO *info,int arg); static int wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr); static int tiocmget(struct tty_struct *tty, struct file *file); static int tiocmset(struct tty_struct *tty, struct file *file, unsigned int set, unsigned int clear); static void set_break(struct tty_struct *tty, int break_state); static void add_device(SLMP_INFO *info); static void device_init(int adapter_num, struct pci_dev *pdev); static int claim_resources(SLMP_INFO *info); static void release_resources(SLMP_INFO *info); static int startup(SLMP_INFO *info); static int block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info); static void shutdown(SLMP_INFO *info); static void program_hw(SLMP_INFO *info); static void change_params(SLMP_INFO *info); static int init_adapter(SLMP_INFO *info); static int register_test(SLMP_INFO *info); static int irq_test(SLMP_INFO *info); static int loopback_test(SLMP_INFO *info); static int adapter_test(SLMP_INFO *info); static int memory_test(SLMP_INFO *info); static void reset_adapter(SLMP_INFO *info); static void reset_port(SLMP_INFO *info); static void async_mode(SLMP_INFO *info); static void hdlc_mode(SLMP_INFO *info); static void rx_stop(SLMP_INFO *info); static void rx_start(SLMP_INFO *info); static void rx_reset_buffers(SLMP_INFO *info); static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last); static int rx_get_frame(SLMP_INFO *info); static void tx_start(SLMP_INFO *info); static void tx_stop(SLMP_INFO *info); static void tx_load_fifo(SLMP_INFO *info); static void tx_set_idle(SLMP_INFO *info); static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count); static void get_signals(SLMP_INFO *info); static void set_signals(SLMP_INFO *info); static void enable_loopback(SLMP_INFO *info, int enable); static void set_rate(SLMP_INFO *info, u32 data_rate); static int bh_action(SLMP_INFO *info); static void bh_handler(void* Context); static void bh_receive(SLMP_INFO *info); static void bh_transmit(SLMP_INFO *info); static void bh_status(SLMP_INFO *info); static void isr_timer(SLMP_INFO *info); static void isr_rxint(SLMP_INFO *info); static void isr_rxrdy(SLMP_INFO *info); static void isr_txint(SLMP_INFO *info); static void isr_txrdy(SLMP_INFO *info); static void isr_rxdmaok(SLMP_INFO *info); static void isr_rxdmaerror(SLMP_INFO *info); static void isr_txdmaok(SLMP_INFO *info); static void isr_txdmaerror(SLMP_INFO *info); static void isr_io_pin(SLMP_INFO *info, u16 status); static int alloc_dma_bufs(SLMP_INFO *info); static void free_dma_bufs(SLMP_INFO *info); static int alloc_buf_list(SLMP_INFO *info); static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count); static int alloc_tmp_rx_buf(SLMP_INFO *info); static void free_tmp_rx_buf(SLMP_INFO *info); static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count); static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit); static void tx_timeout(unsigned long context); static void status_timeout(unsigned long context); static unsigned char read_reg(SLMP_INFO *info, unsigned char addr); static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val); static u16 read_reg16(SLMP_INFO *info, unsigned char addr); static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val); static unsigned char read_status_reg(SLMP_INFO * info); static void write_control_reg(SLMP_INFO * info); static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes static u32 misc_ctrl_value = 0x007e4040; static u32 lcr1_brdr_value = 0x00800028; static u32 read_ahead_count = 8; /* DPCR, DMA Priority Control * * 07..05 Not used, must be 0 * 04 BRC, bus release condition: 0=all transfers complete * 1=release after 1 xfer on all channels * 03 CCC, channel change condition: 0=every cycle * 1=after each channel completes all xfers * 02..00 PR<2..0>, priority 100=round robin * * 00000100 = 0x00 */ static unsigned char dma_priority = 0x04; // Number of bytes that can be written to shared RAM // in a single write operation static u32 sca_pci_load_interval = 64; /* * 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* synclinkmp_get_text_ptr(void); static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;} static inline int sanity_check(SLMP_INFO *info, char *name, const char *routine) { #ifdef SANITY_CHECK static const char *badmagic = "Warning: bad magic number for synclinkmp_struct (%s) in %s\n"; static const char *badinfo = "Warning: null synclinkmp_struct for (%s) in %s\n"; if (!info) { printk(badinfo, name, routine); return 1; } if (info->magic != MGSL_MAGIC) { printk(badmagic, name, routine); return 1; } #else if (!info) return 1; #endif return 0; } /** * 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->receive_buf) ld->receive_buf(tty, data, flags, count); tty_ldisc_deref(ld); } } /* tty callbacks */ /* Called when a port is opened. Init and enable port. */ static int open(struct tty_struct *tty, struct file *filp) { SLMP_INFO *info; int retval, line; unsigned long flags; line = tty->index; if ((line < 0) || (line >= synclinkmp_device_count)) { printk("%s(%d): open with invalid line #%d.\n", __FILE__,__LINE__,line); return -ENODEV; } info = synclinkmp_device_list; while(info && info->line != line) info = info->next_device; if (sanity_check(info, tty->name, "open")) return -ENODEV; if ( info->init_error ) { printk("%s(%d):%s device is not allocated, init error=%d\n", __FILE__,__LINE__,info->device_name,info->init_error); return -ENODEV; } tty->driver_data = info; info->tty = tty; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s open(), old ref count = %d\n", __FILE__,__LINE__,tty->driver->name, info->count); /* If port is closing, signal caller to try again */ if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){ if (info->flags & ASYNC_CLOSING) interruptible_sleep_on(&info->close_wait); retval = ((info->flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS); goto cleanup; } info->tty->low_latency = (info->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; } info->count++; spin_unlock_irqrestore(&info->netlock, flags); if (info->count == 1) { /* 1st open on this device, init hardware */ retval = startup(info); if (retval < 0) goto cleanup; } retval = block_til_ready(tty, filp, info); if (retval) { if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s block_til_ready() returned %d\n", __FILE__,__LINE__, info->device_name, retval); goto cleanup; } if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s open() success\n", __FILE__,__LINE__, info->device_name); retval = 0; cleanup: if (retval) { if (tty->count == 1) info->tty = NULL; /* tty layer will release tty struct */ if(info->count) info->count--; } return retval; } /* Called when port is closed. Wait for remaining data to be * sent. Disable port and free resources. */ static void close(struct tty_struct *tty, struct file *filp) { SLMP_INFO * info = (SLMP_INFO *)tty->driver_data; if (sanity_check(info, tty->name, "close")) return; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s close() entry, count=%d\n", __FILE__,__LINE__, info->device_name, info->count); if (!info->count) return; if (tty_hung_up_p(filp)) goto cleanup; if ((tty->count == 1) && (info->count != 1)) { /* * tty->count is 1 and the tty structure will be freed. * info->count should be one in this case. * if it's not, correct it so that the port is shutdown. */ printk("%s(%d):%s close: bad refcount; tty->count is 1, " "info->count is %d\n", __FILE__,__LINE__, info->device_name, info->count); info->count = 1; } info->count--; /* if at least one open remaining, leave hardware active */ if (info->count) goto cleanup; info->flags |= ASYNC_CLOSING; /* set tty->closing to notify line discipline to * only process XON/XOFF characters. Only the N_TTY * discipline appears to use this (ppp does not). */ tty->closing = 1; /* wait for transmit data to clear all layers */ if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) { if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s close() calling tty_wait_until_sent\n", __FILE__,__LINE__, info->device_name ); tty_wait_until_sent(tty, info->closing_wait); } if (info->flags & ASYNC_INITIALIZED) wait_until_sent(tty, info->timeout); if (tty->driver->flush_buffer) tty->driver->flush_buffer(tty); tty_ldisc_flush(tty); shutdown(info); tty->closing = 0; info->tty = NULL; if (info->blocked_open) { if (info->close_delay) { msleep_interruptible(jiffies_to_msecs(info->close_delay)); } wake_up_interruptible(&info->open_wait); } info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); wake_up_interruptible(&info->close_wait); cleanup: if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__, tty->driver->name, info->count); } /* Called by tty_hangup() when a hangup is signaled. * This is the same as closing all open descriptors for the port. */ static void hangup(struct tty_struct *tty) { SLMP_INFO *info = (SLMP_INFO *)tty->driver_data; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s hangup()\n", __FILE__,__LINE__, info->device_name ); if (sanity_check(info, tty->name, "hangup")) return; flush_buffer(tty); shutdown(info); info->count = 0; info->flags &= ~ASYNC_NORMAL_ACTIVE; info->tty = NULL; wake_up_interruptible(&info->open_wait); } /* Set new termios settings */ static void set_termios(struct tty_struct *tty, struct termios *old_termios) { SLMP_INFO *info = (SLMP_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s set_termios()\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; change_params(info); /* 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); } } /* 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 * * Return Value: number of characters written */ static int write(struct tty_struct *tty, const unsigned char *buf, int count) { int c, ret = 0; SLMP_INFO *info = (SLMP_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s write() count=%d\n", __FILE__,__LINE__,info->device_name,count); if (sanity_check(info, tty->name, "write")) goto cleanup; if (!tty || !info->tx_buf) goto cleanup; if (info->params.mode == MGSL_MODE_HDLC) { if (count > info->max_frame_size) { ret = -EIO; goto cleanup; } if (info->tx_active) goto cleanup; if (info->tx_count) { /* send accumulated data from send_char() calls */ /* as frame and wait before accepting more data. */ tx_load_dma_buffer(info, info->tx_buf, info->tx_count); goto start; } ret = info->tx_count = count; tx_load_dma_buffer(info, buf, count); goto start; } for (;;) { c = min_t(int, count, min(info->max_frame_size - info->tx_count - 1, info->max_frame_size - 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 += c; if (info->tx_put >= info->max_frame_size) info->tx_put -= info->max_frame_size; info->tx_count += c; spin_unlock_irqrestore(&info->lock,flags); buf += c; count -= c; ret += c; } if (info->params.mode == MGSL_MODE_HDLC) { if (count) { ret = info->tx_count = 0; goto cleanup; } tx_load_dma_buffer(info, info->tx_buf, info->tx_count); } start: if (info->tx_count && !tty->stopped && !tty->hw_stopped) { spin_lock_irqsave(&info->lock,flags); if (!info->tx_active) tx_start(info); spin_unlock_irqrestore(&info->lock,flags); } cleanup: if (debug_level >= DEBUG_LEVEL_INFO) printk( "%s(%d):%s write() returning=%d\n", __FILE__,__LINE__,info->device_name,ret); return ret; } /* Add a character to the transmit buffer. */ static void put_char(struct tty_struct *tty, unsigned char ch) { SLMP_INFO *info = (SLMP_INFO *)tty->driver_data; unsigned long flags; if ( debug_level >= DEBUG_LEVEL_INFO ) { printk( "%s(%d):%s put_char(%d)\n", __FILE__,__LINE__,info->device_name,ch); } if (sanity_check(info, tty->name, "put_char")) return; if (!tty || !info->tx_buf) return; spin_lock_irqsave(&info->lock,flags); if ( (info->params.mode != MGSL_MODE_HDLC) || !info->tx_active ) { if (info->tx_count < info->max_frame_size - 1) { info->tx_buf[info->tx_put++] = ch; if (info->tx_put >= info->max_frame_size) info->tx_put -= info->max_frame_size; info->tx_count++; } } spin_unlock_irqrestore(&info->lock,flags); } /* Send a high-priority XON/XOFF character */ static void send_xchar(struct tty_struct *tty, char ch) { SLMP_INFO *info = (SLMP_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s send_xchar(%d)\n", __FILE__,__LINE__, info->device_name, ch ); if (sanity_check(info, tty->name, "send_xchar")) return; info->x_char = ch; if (ch) { /* Make sure transmit interrupts are on */ spin_lock_irqsave(&info->lock,flags); if (!info->tx_enabled) tx_start(info); spin_unlock_irqrestore(&info->lock,flags); } } /* Wait until the transmitter is empty. */ static void wait_until_sent(struct tty_struct *tty, int timeout) { SLMP_INFO * info = (SLMP_INFO *)tty->driver_data; unsigned long orig_jiffies, char_time; if (!info ) return; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s wait_until_sent() entry\n", __FILE__,__LINE__, info->device_name ); if (sanity_check(info, tty->name, "wait_until_sent")) return; if (!(info->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 { //TODO: determine if there is something similar to USC16C32 // TXSTATUS_ALL_SENT status while ( 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):%s wait_until_sent() exit\n", __FILE__,__LINE__, info->device_name ); } /* Return the count of free bytes in transmit buffer */ static int write_room(struct tty_struct *tty) { SLMP_INFO *info = (SLMP_INFO *)tty->driver_data; int ret; if (sanity_check(info, tty->name, "write_room")) return 0; if (info->params.mode == MGSL_MODE_HDLC) { ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE; } else { ret = info->max_frame_size - info->tx_count - 1; if (ret < 0) ret = 0; } if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s write_room()=%d\n", __FILE__, __LINE__, info->device_name, ret); return ret; } /* enable transmitter and send remaining buffered characters */ static void flush_chars(struct tty_struct *tty) { SLMP_INFO *info = (SLMP_INFO *)tty->driver_data; unsigned long flags; if ( debug_level >= DEBUG_LEVEL_INFO ) printk( "%s(%d):%s flush_chars() entry tx_count=%d\n", __FILE__,__LINE__,info->device_name,info->tx_count); if (sanity_check(info, tty->name, "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):%s flush_chars() entry, starting transmitter\n", __FILE__,__LINE__,info->device_name ); spin_lock_irqsave(&info->lock,flags); if (!info->tx_active) { if ( (info->params.mode == MGSL_MODE_HDLC) && info->tx_count ) { /* operating in synchronous (frame oriented) mode */ /* copy data from circular tx_buf to */ /* transmit DMA buffer. */ tx_load_dma_buffer(info, info->tx_buf,info->tx_count); } tx_start(info); } spin_unlock_irqrestore(&info->lock,flags); } /* Discard all data in the send buffer */ static void flush_buffer(struct tty_struct *tty) { SLMP_INFO *info = (SLMP_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s flush_buffer() entry\n", __FILE__,__LINE__, info->device_name ); if (sanity_check(info, tty->name, "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); } /* throttle (stop) transmitter */ static void tx_hold(struct tty_struct *tty) { SLMP_INFO *info = (SLMP_INFO *)tty->driver_data; unsigned long flags; if (sanity_check(info, tty->name, "tx_hold")) return; if ( debug_level >= DEBUG_LEVEL_INFO ) printk("%s(%d):%s tx_hold()\n", __FILE__,__LINE__,info->device_name); spin_lock_irqsave(&info->lock,flags); if (info->tx_enabled) tx_stop(info); spin_unlock_irqrestore(&info->lock,flags); } /* release (start) transmitter */ static void tx_release(struct tty_struct *tty) { SLMP_INFO *info = (SLMP_INFO *)tty->driver_data; unsigned long flags; if (sanity_check(info, tty->name, "tx_release")) return; if ( debug_level >= DEBUG_LEVEL_INFO ) printk("%s(%d):%s tx_release()\n", __FILE__,__LINE__,info->device_name); spin_lock_irqsave(&info->lock,flags); if (!info->tx_enabled) tx_start(info); spin_unlock_irqrestore(&info->lock,flags); } /* Service an IOCTL request * * Arguments: * * tty pointer to tty instance data * file pointer to associated file object for device * cmd IOCTL command code * arg command argument/context * * Return Value: 0 if success, otherwise error code */ static int ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) { SLMP_INFO *info = (SLMP_INFO *)tty->driver_data; int error; struct mgsl_icount cnow; /* kernel counter temps */ struct serial_icounter_struct __user *p_cuser; /* user space */ unsigned long flags; void __user *argp = (void __user *)arg; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__, info->device_name, cmd ); if (sanity_check(info, tty->name, "ioctl")) return -ENODEV; if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { 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); case MGSL_IOCGTXIDLE: return get_txidle(info, argp); case MGSL_IOCSTXIDLE: return set_txidle(info, (int)arg); case MGSL_IOCTXENABLE: return tx_enable(info, (int)arg); case MGSL_IOCRXENABLE: return rx_enable(info, (int)arg); case MGSL_IOCTXABORT: return tx_abort(info); case MGSL_IOCGSTATS: return get_stats(info, argp); case MGSL_IOCWAITEVENT: return wait_mgsl_event(info, argp); case MGSL_IOCLOOPTXDONE: return 0; // TODO: Not supported, need to document /* Wait for modem input (DCD,RI,DSR,CTS) change * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS) */ case TIOCMIWAIT: return modem_input_wait(info,(int)arg); /* * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) * Return: write counters to the user passed counter struct * NB: both 1->0 and 0->1 transitions are counted except for * RI where only 0->1 is counted. */ case TIOCGICOUNT: spin_lock_irqsave(&info->lock,flags); cnow = info->icount; spin_unlock_irqrestore(&info->lock,flags); p_cuser = argp; PUT_USER(error,cnow.cts, &p_cuser->cts); if (error) return error; PUT_USER(error,cnow.dsr, &p_cuser->dsr); if (error) return error; PUT_USER(error,cnow.rng, &p_cuser->rng); if (error) return error; PUT_USER(error,cnow.dcd, &p_cuser->dcd); if (error) return error; PUT_USER(error,cnow.rx, &p_cuser->rx); if (error) return error; PUT_USER(error,cnow.tx, &p_cuser->tx); if (error) return error; PUT_USER(error,cnow.frame, &p_cuser->frame); if (error) return error; PUT_USER(error,cnow.overrun, &p_cuser->overrun); if (error) return error; PUT_USER(error,cnow.parity, &p_cuser->parity); if (error) return error; PUT_USER(error,cnow.brk, &p_cuser->brk); if (error) return error; PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun); if (error) return error; return 0; default: return -ENOIOCTLCMD; } return 0; } /* * /proc fs routines.... */ static inline int line_info(char *buf, SLMP_INFO *info) { char stat_buf[30]; int ret; unsigned long flags; ret = sprintf(buf, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n" "\tIRQ=%d MaxFrameSize=%u\n", info->device_name, info->phys_sca_base, info->phys_memory_base, info->phys_statctrl_base, info->phys_lcr_base, info->irq_level, info->max_frame_size ); /* 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) { ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d", info->icount.txok, info->icount.rxok); if (info->icount.txunder) ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder); if (info->icount.txabort) ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort); if (info->icount.rxshort) ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort); if (info->icount.rxlong) ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong); if (info->icount.rxover) ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover); if (info->icount.rxcrc) ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxcrc); } else { ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d", info->icount.tx, info->icount.rx); if (info->icount.frame) ret += sprintf(buf+ret, " fe:%d", info->icount.frame); if (info->icount.parity) ret += sprintf(buf+ret, " pe:%d", info->icount.parity); if (info->icount.brk) ret += sprintf(buf+ret, " brk:%d", info->icount.brk); if (info->icount.overrun) ret += sprintf(buf+ret, " oe:%d", info->icount.overrun); } /* Append serial signal status to end */ ret += sprintf(buf+ret, " %s\n", stat_buf+1); ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n", info->tx_active,info->bh_requested,info->bh_running, info->pending_bh); return ret; } /* Called to print information about devices */ int read_proc(char *page, char **start, off_t off, int count, int *eof, void *data) { int len = 0, l; off_t begin = 0; SLMP_INFO *info; len += sprintf(page, "synclinkmp driver:%s\n", driver_version); info = synclinkmp_device_list; while( info ) { l = line_info(page + len, info); len += l; if (len+begin > off+count) goto done; if (len+begin < off) { begin += len; len = 0; } info = info->next_device; } *eof = 1; done: if (off >= len+begin) return 0; *start = page + (off-begin); return ((count < begin+len-off) ? count : begin+len-off); } /* Return the count of bytes in transmit buffer */ static int chars_in_buffer(struct tty_struct *tty) { SLMP_INFO *info = (SLMP_INFO *)tty->driver_data; if (sanity_check(info, tty->name, "chars_in_buffer")) return 0; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s chars_in_buffer()=%d\n", __FILE__, __LINE__, info->device_name, info->tx_count); return info->tx_count; } /* Signal remote device to throttle send data (our receive data) */ static void throttle(struct tty_struct * tty) { SLMP_INFO *info = (SLMP_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s throttle() entry\n", __FILE__,__LINE__, info->device_name ); if (sanity_check(info, tty->name, "throttle")) return; if (I_IXOFF(tty)) 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 unthrottle(struct tty_struct * tty) { SLMP_INFO *info = (SLMP_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s unthrottle() entry\n", __FILE__,__LINE__, info->device_name ); if (sanity_check(info, tty->name, "unthrottle")) return; if (I_IXOFF(tty)) { if (info->x_char) info->x_char = 0; else 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); } } /* set or clear transmit break condition * break_state -1=set break condition, 0=clear */ static void set_break(struct tty_struct *tty, int break_state) { unsigned char RegValue; SLMP_INFO * info = (SLMP_INFO *)tty->driver_data; unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s set_break(%d)\n", __FILE__,__LINE__, info->device_name, break_state); if (sanity_check(info, tty->name, "set_break")) return; spin_lock_irqsave(&info->lock,flags); RegValue = read_reg(info, CTL); if (break_state == -1) RegValue |= BIT3; else RegValue &= ~BIT3; write_reg(info, CTL, RegValue); spin_unlock_irqrestore(&info->lock,flags); } #ifdef CONFIG_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) { SLMP_INFO *info = dev_to_port(dev); unsigned char new_encoding; unsigned short new_crctype; /* return error if TTY interface open */ if (info->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) program_hw(info); return 0; } /** * called by generic HDLC layer to send frame * * skb socket buffer containing HDLC frame * dev pointer to network device structure * * returns 0 if success, otherwise error code */ static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev) { SLMP_INFO *info = dev_to_port(dev); struct net_device_stats *stats = hdlc_stats(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 */ info->tx_count = skb->len; tx_load_dma_buffer(info, skb->data, skb->len); /* update network statistics */ stats->tx_packets++; 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) tx_start(info); spin_unlock_irqrestore(&info->lock,flags); return 0; } /** * 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) { SLMP_INFO *info = dev_to_port(dev); 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 */ if ((rc = hdlc_open(dev))) return rc; /* arbitrate between network and tty opens */ spin_lock_irqsave(&info->netlock, flags); if (info->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); /* claim resources and init adapter */ if ((rc = startup(info)) != 0) { spin_lock_irqsave(&info->netlock, flags); info->netcount=0; spin_unlock_irqrestore(&info->netlock, flags); return rc; } /* assert DTR and RTS, apply hardware settings */ info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR; program_hw(info); /* 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); hdlc_set_carrier(info->serial_signals & SerialSignal_DCD, 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) { SLMP_INFO *info = dev_to_port(dev); 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); 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; SLMP_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->count) return -EBUSY; if (cmd != SIOCWANDEV) return hdlc_ioctl(dev, ifr, cmd); 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) program_hw(info); 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) { SLMP_INFO *info = dev_to_port(dev); struct net_device_stats *stats = hdlc_stats(dev); unsigned long flags; if (debug_level >= DEBUG_LEVEL_INFO) printk("hdlcdev_tx_timeout(%s)\n",dev->name); stats->tx_errors++; 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(SLMP_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(SLMP_INFO *info, char *buf, int size) { struct sk_buff *skb = dev_alloc_skb(size); struct net_device *dev = info->netdev; struct net_device_stats *stats = hdlc_stats(dev); 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); stats->rx_dropped++; return; } memcpy(skb_put(skb, size),buf,size); skb->protocol = hdlc_type_trans(skb, info->netdev); stats->rx_packets++; stats->rx_bytes += size; netif_rx(skb); info->netdev->last_rx = jiffies; } /** * 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(SLMP_INFO *info) { int rc; struct net_device *dev; hdlc_device *hdlc; /* allocate and initialize network and HDLC layer objects */ if (!(dev = alloc_hdlcdev(info))) { printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__); return -ENOMEM; } /* for network layer reporting purposes only */ dev->mem_start = info->phys_sca_base; dev->mem_end = info->phys_sca_base + SCA_BASE_SIZE - 1; dev->irq = info->irq_level; /* network layer callbacks and settings */ dev->do_ioctl = hdlcdev_ioctl; dev->open = hdlcdev_open; dev->stop = hdlcdev_close; dev->tx_timeout = hdlcdev_tx_timeout; 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 */ if ((rc = register_hdlc_device(dev))) { 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(SLMP_INFO *info) { unregister_hdlc_device(info->netdev); free_netdev(info->netdev); info->netdev = NULL; } #endif /* CONFIG_HDLC */ /* Return next bottom half action to perform. * Return Value: BH action code or 0 if nothing to do. */ int bh_action(SLMP_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 = 0; info->bh_requested = 0; } spin_unlock_irqrestore(&info->lock,flags); return rc; } /* Perform bottom half processing of work items queued by ISR. */ void bh_handler(void* Context) { SLMP_INFO *info = (SLMP_INFO*)Context; int action; if (!info) return; if ( debug_level >= DEBUG_LEVEL_BH ) printk( "%s(%d):%s bh_handler() entry\n", __FILE__,__LINE__,info->device_name); info->bh_running = 1; while((action = bh_action(info)) != 0) { /* Process work item */ if ( debug_level >= DEBUG_LEVEL_BH ) printk( "%s(%d):%s bh_handler() work item action=%d\n", __FILE__,__LINE__,info->device_name, action); switch (action) { case BH_RECEIVE: bh_receive(info); break; case BH_TRANSMIT: bh_transmit(info); break; case BH_STATUS: bh_status(info); break; default: /* unknown work item ID */ printk("%s(%d):%s Unknown work item ID=%08X!\n", __FILE__,__LINE__,info->device_name,action); break; } } if ( debug_level >= DEBUG_LEVEL_BH ) printk( "%s(%d):%s bh_handler() exit\n", __FILE__,__LINE__,info->device_name); } void bh_receive(SLMP_INFO *info) { if ( debug_level >= DEBUG_LEVEL_BH ) printk( "%s(%d):%s bh_receive()\n", __FILE__,__LINE__,info->device_name); while( rx_get_frame(info) ); } void bh_transmit(SLMP_INFO *info) { struct tty_struct *tty = info->tty; if ( debug_level >= DEBUG_LEVEL_BH ) printk( "%s(%d):%s bh_transmit() entry\n", __FILE__,__LINE__,info->device_name); if (tty) { tty_wakeup(tty); wake_up_interruptible(&tty->write_wait); } } void bh_status(SLMP_INFO *info) { if ( debug_level >= DEBUG_LEVEL_BH ) printk( "%s(%d):%s bh_status() entry\n", __FILE__,__LINE__,info->device_name); info->ri_chkcount = 0; info->dsr_chkcount = 0; info->dcd_chkcount = 0; info->cts_chkcount = 0; } void isr_timer(SLMP_INFO * info) { unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0; /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */ write_reg(info, IER2, 0); /* TMCS, Timer Control/Status Register * * 07 CMF, Compare match flag (read only) 1=match * 06 ECMI, CMF Interrupt Enable: 0=disabled * 05 Reserved, must be 0 * 04 TME, Timer Enable * 03..00 Reserved, must be 0 * * 0000 0000 */ write_reg(info, (unsigned char)(timer + TMCS), 0); info->irq_occurred = TRUE; if ( debug_level >= DEBUG_LEVEL_ISR ) printk("%s(%d):%s isr_timer()\n", __FILE__,__LINE__,info->device_name); } void isr_rxint(SLMP_INFO * info) { struct tty_struct *tty = info->tty; struct mgsl_icount *icount = &info->icount; unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD); unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN; /* clear status bits */ if (status) write_reg(info, SR1, status); if (status2) write_reg(info, SR2, status2); if ( debug_level >= DEBUG_LEVEL_ISR ) printk("%s(%d):%s isr_rxint status=%02X %02x\n", __FILE__,__LINE__,info->device_name,status,status2); if (info->params.mode == MGSL_MODE_ASYNC) { if (status & BRKD) { icount->brk++; /* process break detection if tty control * is not set to ignore it */ if ( tty ) { if (!(status & info->ignore_status_mask1)) { if (info->read_status_mask1 & BRKD) { tty_insert_flip_char(tty, 0, TTY_BREAK); if (info->flags & ASYNC_SAK) do_SAK(tty); } } } } } else { if (status & (FLGD|IDLD)) { if (status & FLGD) info->icount.exithunt++; else if (status & IDLD) info->icount.rxidle++; wake_up_interruptible(&info->event_wait_q); } } if (status & CDCD) { /* simulate a common modem status change interrupt * for our handler */ get_signals( info ); isr_io_pin(info, MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD)); } } /* * handle async rx data interrupts */ void isr_rxrdy(SLMP_INFO * info) { u16 status; unsigned char DataByte; struct tty_struct *tty = info->tty; struct mgsl_icount *icount = &info->icount; if ( debug_level >= DEBUG_LEVEL_ISR ) printk("%s(%d):%s isr_rxrdy\n", __FILE__,__LINE__,info->device_name); while((status = read_reg(info,CST0)) & BIT0) { int flag = 0; int over = 0; DataByte = read_reg(info,TRB); icount->rx++; if ( status & (PE + FRME + OVRN) ) { printk("%s(%d):%s rxerr=%04X\n", __FILE__,__LINE__,info->device_name,status); /* update error statistics */ if (status & PE) icount->parity++; else if (status & FRME) icount->frame++; else if (status & OVRN) icount->overrun++; /* discard char if tty control flags say so */ if (status & info->ignore_status_mask2) continue; status &= info->read_status_mask2; if ( tty ) { if (status & PE) flag = TTY_PARITY; else if (status & FRME) flag = TTY_FRAME; if (status & OVRN) { /* Overrun is special, since it's * reported immediately, and doesn't * affect the current character */ over = 1; } } } /* end of if (error) */ if ( tty ) { tty_insert_flip_char(tty, DataByte, flag); if (over) tty_insert_flip_char(tty, 0, TTY_OVERRUN); } } if ( debug_level >= DEBUG_LEVEL_ISR ) { printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n", __FILE__,__LINE__,info->device_name, icount->rx,icount->brk,icount->parity, icount->frame,icount->overrun); } if ( tty ) tty_flip_buffer_push(tty); } static void isr_txeom(SLMP_INFO * info, unsigned char status) { if ( debug_level >= DEBUG_LEVEL_ISR ) printk("%s(%d):%s isr_txeom status=%02x\n", __FILE__,__LINE__,info->device_name,status); write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */ write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */ write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */ if (status & UDRN) { write_reg(info, CMD, TXRESET); write_reg(info, CMD, TXENABLE); } else write_reg(info, CMD, TXBUFCLR); /* disable and clear tx interrupts */ info->ie0_value &= ~TXRDYE; info->ie1_value &= ~(IDLE + UDRN); write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value)); write_reg(info, SR1, (unsigned char)(UDRN + IDLE)); if ( info->tx_active ) { if (info->params.mode != MGSL_MODE_ASYNC) { if (status & UDRN) info->icount.txunder++; else if (status & IDLE) info->icount.txok++; } info->tx_active = 0; info->tx_count = info->tx_put = info->tx_get = 0; del_timer(&info->tx_timer); if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) { info->serial_signals &= ~SerialSignal_RTS; info->drop_rts_on_tx_done = 0; set_signals(info); } #ifdef CONFIG_HDLC if (info->netcount) hdlcdev_tx_done(info); else #endif { if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) { tx_stop(info); return; } info->pending_bh |= BH_TRANSMIT; } } } /* * handle tx status interrupts */ void isr_txint(SLMP_INFO * info) { unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS); /* clear status bits */ write_reg(info, SR1, status); if ( debug_level >= DEBUG_LEVEL_ISR ) printk("%s(%d):%s isr_txint status=%02x\n", __FILE__,__LINE__,info->device_name,status); if (status & (UDRN + IDLE)) isr_txeom(info, status); if (status & CCTS) { /* simulate a common modem status change interrupt * for our handler */ get_signals( info ); isr_io_pin(info, MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS)); } } /* * handle async tx data interrupts */ void isr_txrdy(SLMP_INFO * info) { if ( debug_level >= DEBUG_LEVEL_ISR ) printk("%s(%d):%s isr_txrdy() tx_count=%d\n", __FILE__,__LINE__,info->device_name,info->tx_count); if (info->params.mode != MGSL_MODE_ASYNC) { /* disable TXRDY IRQ, enable IDLE IRQ */ info->ie0_value &= ~TXRDYE; info->ie1_value |= IDLE; write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value)); return; } if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) { tx_stop(info); return; } if ( info->tx_count ) tx_load_fifo( info ); else { info->tx_active = 0; info->ie0_value &= ~TXRDYE; write_reg(info, IE0, info->ie0_value); } if (info->tx_count < WAKEUP_CHARS) info->pending_bh |= BH_TRANSMIT; } void isr_rxdmaok(SLMP_INFO * info) { /* BIT7 = EOT (end of transfer) * BIT6 = EOM (end of message/frame) */ unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0; /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */ write_reg(info, RXDMA + DSR, (unsigned char)(status | 1)); if ( debug_level >= DEBUG_LEVEL_ISR ) printk("%s(%d):%s isr_rxdmaok(), status=%02x\n", __FILE__,__LINE__,info->device_name,status); info->pending_bh |= BH_RECEIVE; } void isr_rxdmaerror(SLMP_INFO * info) { /* BIT5 = BOF (buffer overflow) * BIT4 = COF (counter overflow) */ unsigned char status = read_reg(info,RXDMA + DSR) & 0x30; /* clear IRQ (BIT0 must b