blob: 2b18adc4ee1930818c856b92672af4b11b68671c [file] [log] [blame]
/*
* $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 <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/smp_lock.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, struct file *file, 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, struct file *file);
static int tiocmset(struct tty_struct *tty, struct file *file,
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;
if (info->port.flags & ASYNC_INITIALIZED)
wait_until_sent(tty, info->timeout);
flush_buffer(tty);
tty_ldisc_flush(tty);
shutdown(info);
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;
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->port.count = 0;
info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
info->port.tty = NULL;
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;
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 0;
if (!info->tx_buf)
return 0;
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++;
ret = 1;
}
}
spin_unlock_irqrestore(&info->lock,flags);
return ret;
}
/* Send a high-priority XON/XOFF character
*/
static void send_xchar(struct tty_struct *tty, char ch)
{
SLMP_INFO *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 = 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;
lock_kernel();
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 {
//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:
unlock_kernel();
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 = tty->driver_data;
int ret;
if (sanity_check(info, tty->name, "write_room"))
return 0;
lock_kernel();
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;
}
unlock_kernel();
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 = 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 = 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);
tty_wakeup(tty);
}
/* throttle (stop) transmitter
*/
static void tx_hold(struct tty_struct *tty)
{
SLMP_INFO *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 = 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 do_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
SLMP_INFO *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;
}
static int ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
int ret;
lock_kernel();
ret = do_ioctl(tty, file, cmd, arg);
unlock_kernel();
return ret;
}
/*
* /proc fs routines....
*/
static inline void line_info(struct seq_file *m, SLMP_INFO *info)
{
char stat_buf[30];
unsigned long flags;
seq_printf(m, "%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) {
seq_printf(m, "\tHDLC 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, " rxlong:%d", info->icount.rxcrc);
} else {
seq_printf(m, "\tASYNC 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, "\ttxactive=%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 synclinkmp_proc_show(struct seq_file *m, void *v)
{
SLMP_INFO *info;
seq_printf(m, "synclinkmp driver:%s\n", driver_version);
info = synclinkmp_device_list;
while( info ) {
line_info(m, info);
info = info->next_device;
}
return 0;
}
static int synclinkmp_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, synclinkmp_proc_show, NULL);
}
static const struct file_operations synclinkmp_proc_fops = {
.owner = THIS_MODULE,
.open = synclinkmp_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
/* Return the count of bytes in transmit buffer
*/
static int chars_in_buffer(struct tty_struct *tty)
{
SLMP_INFO *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 = 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 = 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 int set_break(struct tty_struct *tty, int break_state)
{
unsigned char RegValue;
SLMP_INFO * 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 -EINVAL;
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);
return 0;
}
#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)
{
SLMP_INFO *info = dev_to_port(dev);
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)
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
*/
static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
struct net_device *dev)
{
SLMP_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 */
info->tx_count = skb->len;
tx_load_dma_buffer(info, skb->data, 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)
tx_start(info);
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)
{
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->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);
/* 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);
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)
{
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->port.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);
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(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;
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(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->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 */
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.
*/
static 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 = false;
info->bh_requested = false;
}
spin_unlock_irqrestore(&info->lock,flags);
return rc;
}
/* Perform bottom half processing of work items queued by ISR.
*/
static void bh_handler(struct work_struct *work)
{
SLMP_INFO *info = container_of(work, SLMP_INFO, task);
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 = true;
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);
}
static 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) );
}
static void bh_transmit(SLMP_INFO *info)
{
struct tty_struct *tty = info->port.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);
}
static 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;
}
static 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);
}
static void isr_rxint(SLMP_INFO * info)
{
struct tty_struct *tty = info->port.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->port.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
*/
static void isr_rxrdy(SLMP_INFO * info)
{
u16 status;
unsigned char DataByte;
struct tty_struct *tty = info->port.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;
bool over = false;
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 = true;
}
}
} /* 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 = false;
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 = false;
set_signals(info);
}
#if SYNCLINK_GENERIC_HDLC
if (info->netcount)
hdlcdev_tx_done(info);
else
#endif
{
if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
tx_stop(info);
return;
}
info->pending_bh |= BH_TRANSMIT;
}
}
}
/*
* handle tx status interrupts
*/
static 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
*/
static 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->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
tx_stop(info);
return;
}
if ( info->tx_count )
tx_load_fifo( info );
else {
info->tx_active = false;
info->ie0_value &= ~TXRDYE;
write_reg(info, IE0, info->ie0_value);
}
if (info->tx_count < WAKEUP_CHARS)
info->pending_bh |= BH_TRANSMIT;
}
static 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;
}
static 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 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_rxdmaerror(), status=%02x\n",
__FILE__,__LINE__,info->device_name,status);
info->rx_overflow = true;
info->pending_bh |= BH_RECEIVE;
}
static void isr_txdmaok(SLMP_INFO * info)
{
unsigned char status_reg1 = read_reg(info, SR1);
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 ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
__FILE__,__LINE__,info->device_name,status_reg1);
/* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
write_reg16(info, TRC0, 0);
info->ie0_value |= TXRDYE;
write_reg(info, IE0, info->ie0_value);
}
static void isr_txdmaerror(SLMP_INFO * info)
{
/* BIT5 = BOF (buffer overflow)
* BIT4 = COF (counter overflow)
*/
unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
/* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
__FILE__,__LINE__,info->device_name,status);
}
/* handle input serial signal changes
*/
static void isr_io_pin( SLMP_INFO *info, u16 status )
{
struct mgsl_icount *icount;
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):isr_io_pin status=%04X\n",
__FILE__,__LINE__,status);
if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
icount = &info->icount;
/* update input line counters */
if (status & MISCSTATUS_RI_LATCHED) {
icount->rng++;
if ( status & SerialSignal_RI )
info->input_signal_events.ri_up++;
else
info->input_signal_events.ri_down++;
}
if (status & MISCSTATUS_DSR_LATCHED) {
icount->dsr++;
if ( status & SerialSignal_DSR )
info->input_signal_events.dsr_up++;
else
info->input_signal_events.dsr_down++;
}
if (status & MISCSTATUS_DCD_LATCHED) {
if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
info->ie1_value &= ~CDCD;
write_reg(info, IE1, info->ie1_value);
}
icount->dcd++;
if (status & SerialSignal_DCD) {
info->input_signal_events.dcd_up++;
} else
info->input_signal_events.dcd_down++;
#if SYNCLINK_GENERIC_HDLC
if (info->netcount) {
if (status & SerialSignal_DCD)
netif_carrier_on(info->netdev);
else
netif_carrier_off(info->netdev);
}
#endif
}
if (status & MISCSTATUS_CTS_LATCHED)
{
if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
info->ie1_value &= ~CCTS;
write_reg(info, IE1, info->ie1_value);
}
icount->cts++;
if ( status & 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 ( (info->port.flags & ASYNC_CHECK_CD) &&
(status & MISCSTATUS_DCD_LATCHED) ) {
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s CD now %s...", info->device_name,
(status & SerialSignal_DCD) ? "on" : "off");
if (status & SerialSignal_DCD)
wake_up_interruptible(&info->port.open_wait);
else {
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("doing serial hangup...");
if (info->port.tty)
tty_hangup(info->port.tty);
}
}
if ( (info->port.flags & ASYNC_CTS_FLOW) &&
(status & MISCSTATUS_CTS_LATCHED) ) {
if ( info->port.tty ) {
if (info->port.tty->hw_stopped) {
if (status & SerialSignal_CTS) {
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("CTS tx start...");
info->port.tty->hw_stopped = 0;
tx_start(info);
info->pending_bh |= BH_TRANSMIT;
return;
}
} else {
if (!(status & SerialSignal_CTS)) {
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("CTS tx stop...");
info->port.tty->hw_stopped = 1;
tx_stop(info);
}
}
}
}
}
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
* regs interrupted processor context
*/
static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
{
SLMP_INFO *info = dev_id;
unsigned char status, status0, status1=0;
unsigned char dmastatus, dmastatus0, dmastatus1=0;
unsigned char timerstatus0, timerstatus1=0;
unsigned char shift;
unsigned int i;
unsigned short tmp;
if ( debug_level >= DEBUG_LEVEL_ISR )
printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
__FILE__, __LINE__, info->irq_level);
spin_lock(&info->lock);
for(;;) {
/* get status for SCA0 (ports 0-1) */
tmp = read_reg16(info, ISR0); /* get ISR0 and ISR1 in one read */
status0 = (unsigned char)tmp;
dmastatus0 = (unsigned char)(tmp>>8);
timerstatus0 = read_reg(info, ISR2);
if ( debug_level >= DEBUG_LEVEL_ISR )
printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
__FILE__, __LINE__, info->device_name,
status0, dmastatus0, timerstatus0);
if (info->port_count == 4) {
/* get status for SCA1 (ports 2-3) */
tmp = read_reg16(info->port_array[2], ISR0);
status1 = (unsigned char)tmp;
dmastatus1 = (unsigned char)(tmp>>8);
timerstatus1 = read_reg(info->port_array[2], ISR2);
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
__FILE__,__LINE__,info->device_name,
status1,dmastatus1,timerstatus1);
}
if (!status0 && !dmastatus0 && !timerstatus0 &&
!status1 && !dmastatus1 && !timerstatus1)
break;
for(i=0; i < info->port_count ; i++) {
if (info->port_array[i] == NULL)
continue;
if (i < 2) {
status = status0;
dmastatus = dmastatus0;
} else {
status = status1;
dmastatus = dmastatus1;
}
shift = i & 1 ? 4 :0;
if (status & BIT0 << shift)
isr_rxrdy(info->port_array[i]);
if (status & BIT1 << shift)
isr_txrdy(info->port_array[i]);
if (status & BIT2 << shift)
isr_rxint(info->port_array[i]);
if (status & BIT3 << shift)
isr_txint(info->port_array[i]);
if (dmastatus & BIT0 << shift)
isr_rxdmaerror(info->port_array[i]);
if (dmastatus & BIT1 << shift)
isr_rxdmaok(info->port_array[i]);
if (dmastatus & BIT2 << shift)
isr_txdmaerror(info->port_array[i]);
if (dmastatus & BIT3 << shift)
isr_txdmaok(info->port_array[i]);
}
if (timerstatus0 & (BIT5 | BIT4))
isr_timer(info->port_array[0]);
if (timerstatus0 & (BIT7 | BIT6))
isr_timer(info->port_array[1]);
if (timerstatus1 & (BIT5 | BIT4))
isr_timer(info->port_array[2]);
if (timerstatus1 & (BIT7 | BIT6))
isr_timer(info->port_array[3]);
}
for(i=0; i < info->port_count ; i++) {
SLMP_INFO * port = info->port_array[i];
/* Request bottom half processing if there's something
* for it to do and the bh is not already running.
*
* Note: startup adapter diags require interrupts.
* do not request bottom half processing if the
* device is not open in a normal mode.
*/
if ( port && (port->port.count || port->netcount) &&
port->pending_bh && !port->bh_running &&
!port->bh_requested ) {
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s queueing bh task.\n",
__FILE__,__LINE__,port->device_name);
schedule_work(&port->task);
port->bh_requested = true;
}
}
spin_unlock(&info->lock);
if ( debug_level >= DEBUG_LEVEL_ISR )
printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
__FILE__, __LINE__, info->irq_level);
return IRQ_HANDLED;
}
/* Initialize and start device.
*/
static int startup(SLMP_INFO * info)
{
if ( debug_level >= DEBUG_LEVEL_INFO )
printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
if (info->port.flags & ASYNC_INITIALIZED)
return 0;
if (!info->tx_buf) {
info->tx_buf = kmalloc(info->max_frame_size, 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));
/* program hardware for current parameters */
reset_port(info);
change_params(info);
mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
if (info->port.tty)
clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
info->port.flags |= ASYNC_INITIALIZED;
return 0;
}
/* Called by close() and hangup() to shutdown hardware
*/
static void shutdown(SLMP_INFO * info)
{
unsigned long flags;
if (!(info->port.flags & ASYNC_INITIALIZED))
return;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s synclinkmp_shutdown()\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(&info->tx_timer);
del_timer(&info->status_timer);
kfree(info->tx_buf);
info->tx_buf = NULL;
spin_lock_irqsave(&info->lock,flags);
reset_port(info);
if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
set_signals(info);
}
spin_unlock_irqrestore(&info->lock,flags);
if (info->port.tty)
set_bit(TTY_IO_ERROR, &info->port.tty->flags);
info->port.flags &= ~ASYNC_INITIALIZED;
}
static void program_hw(SLMP_INFO *info)
{
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