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synclinkmp.c
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synclinkmp.c
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/*
* $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
*
* 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 <linux/module.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/pci.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 <asm/system.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 <linux/synclink.h>
#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_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; */
};
/* 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
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;
struct tty_port port;
int line;
unsigned short close_delay;
unsigned short closing_wait; /* time to wait before closing */
struct mgsl_icount icount;
int timeout;
int x_char; /* xon/xoff character */
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 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;
bool bh_running; /* Protection from multiple */
int isr_overflow;
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;
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;
bool rx_enabled;
bool rx_overflow;
bool tx_enabled;
bool 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;
bool irq_requested; /* true if IRQ requested */
MGSL_PARAMS params; /* communications parameters */
unsigned char serial_signals; /* current serial signal states */
bool 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;
bool 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;
bool sca_statctrl_requested;
u32 misc_ctrl_value;
char flag_buf[MAX_ASYNC_BUFFER_SIZE];
char char_buf[MAX_ASYNC_BUFFER_SIZE];
bool drop_rts_on_tx_done;
struct _input_signal_events input_signal_events;
/* SPPP/Cisco HDLC device parts */
int netcount;
spinlock_t netlock;
#if SYNCLINK_GENERIC_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,};
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);
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 ktermios *old_termios);
static int write(struct tty_struct *tty, const unsigned char *buf, int count);
static int 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, unsigned int cmd, unsigned long arg);
static int chars_in_buffer(struct tty_struct *tty);
static void throttle(struct tty_struct * tty);
static void unthrottle(struct tty_struct * tty);
static int set_break(struct tty_struct *tty, int break_state);
#if SYNCLINK_GENERIC_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);
static int tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
static int 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 int carrier_raised(struct tty_port *port);
static void shutdown(SLMP_INFO *info);
static void program_hw(SLMP_INFO *info);
static void change_params(SLMP_INFO *info);
static bool init_adapter(SLMP_INFO *info);
static bool register_test(SLMP_INFO *info);
static bool irq_test(SLMP_INFO *info);
static bool loopback_test(SLMP_INFO *info);
static int adapter_test(SLMP_INFO *info);
static bool 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 bool 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(struct work_struct *work);
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->ops->receive_buf)
ld->ops->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->port.tty = tty;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s open(), old ref count = %d\n",
__FILE__,__LINE__,tty->driver->name, info->port.count);
/* If port is closing, signal caller to try again */
if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
if (info->port.flags & ASYNC_CLOSING)
interruptible_sleep_on(&info->port.close_wait);
retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS);
goto cleanup;
}
info->port.tty->low_latency = (info->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;
}
info->port.count++;
spin_unlock_irqrestore(&info->netlock, flags);
if (info->port.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->port.tty = NULL; /* tty layer will release tty struct */
if(info->port.count)
info->port.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 = 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->port.count);
if (tty_port_close_start(&info->port, tty, filp) == 0)
goto cleanup;
mutex_lock(&info->port.mutex);
if (info->port.flags & ASYNC_INITIALIZED)
wait_until_sent(tty, info->timeout);
flush_buffer(tty);
tty_ldisc_flush(tty);
shutdown(info);
mutex_unlock(&info->port.mutex);
tty_port_close_end(&info->port, tty);
info->port.tty = NULL;
cleanup:
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
tty->driver->name, info->port.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 = tty->driver_data;
unsigned long flags;
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;
mutex_lock(&info->port.mutex);
flush_buffer(tty);
shutdown(info);
spin_lock_irqsave(&info->port.lock, flags);
info->port.count = 0;
info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
info->port.tty = NULL;
spin_unlock_irqrestore(&info->port.lock, flags);
mutex_unlock(&info->port.mutex);
wake_up_interruptible(&info->port.open_wait);
}
/* Set new termios settings
*/
static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
{
SLMP_INFO *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 );
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 = 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 (!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 int put_char(struct tty_struct *tty, unsigned char ch)
{
SLMP_INFO *info = tty->driver_data;
unsigned long flags;
int ret = 0;