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synclink_gt.c
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/*
* Device driver for Microgate SyncLink GT serial adapters.
*
* written by Paul Fulghum for Microgate Corporation
*
* Microgate and SyncLink are trademarks of Microgate Corporation
*
* This code is released under the GNU General Public License (GPL)
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* DEBUG OUTPUT DEFINITIONS
*
* uncomment lines below to enable specific types of debug output
*
* DBGINFO information - most verbose output
* DBGERR serious errors
* DBGBH bottom half service routine debugging
* DBGISR interrupt service routine debugging
* DBGDATA output receive and transmit data
* DBGTBUF output transmit DMA buffers and registers
* DBGRBUF output receive DMA buffers and registers
*/
#define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
#define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
#define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
#define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
#define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
/*#define DBGTBUF(info) dump_tbufs(info)*/
/*#define DBGRBUF(info) dump_rbufs(info)*/
#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 <linux/termios.h>
#include <linux/bitops.h>
#include <linux/workqueue.h>
#include <linux/hdlc.h>
#include <linux/synclink.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/dma.h>
#include <asm/types.h>
#include <asm/uaccess.h>
#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
#define SYNCLINK_GENERIC_HDLC 1
#else
#define SYNCLINK_GENERIC_HDLC 0
#endif
/*
* module identification
*/
static char *driver_name = "SyncLink GT";
static char *tty_driver_name = "synclink_gt";
static char *tty_dev_prefix = "ttySLG";
MODULE_LICENSE("GPL");
#define MGSL_MAGIC 0x5401
#define MAX_DEVICES 32
static struct pci_device_id pci_table[] = {
{PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
{PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
{PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
{PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
{0,}, /* terminate list */
};
MODULE_DEVICE_TABLE(pci, pci_table);
static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
static void remove_one(struct pci_dev *dev);
static struct pci_driver pci_driver = {
.name = "synclink_gt",
.id_table = pci_table,
.probe = init_one,
.remove = remove_one,
};
static bool pci_registered;
/*
* module configuration and status
*/
static struct slgt_info *slgt_device_list;
static int slgt_device_count;
static int ttymajor;
static int debug_level;
static int maxframe[MAX_DEVICES];
module_param(ttymajor, int, 0);
module_param(debug_level, int, 0);
module_param_array(maxframe, int, NULL, 0);
MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
/*
* tty support and callbacks
*/
static struct tty_driver *serial_driver;
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);
/*
* generic HDLC support and callbacks
*/
#if SYNCLINK_GENERIC_HDLC
#define dev_to_port(D) (dev_to_hdlc(D)->priv)
static void hdlcdev_tx_done(struct slgt_info *info);
static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
static int hdlcdev_init(struct slgt_info *info);
static void hdlcdev_exit(struct slgt_info *info);
#endif
/*
* device specific structures, macros and functions
*/
#define SLGT_MAX_PORTS 4
#define SLGT_REG_SIZE 256
/*
* conditional wait facility
*/
struct cond_wait {
struct cond_wait *next;
wait_queue_head_t q;
wait_queue_t wait;
unsigned int data;
};
static void init_cond_wait(struct cond_wait *w, unsigned int data);
static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
static void flush_cond_wait(struct cond_wait **head);
/*
* DMA buffer descriptor and access macros
*/
struct slgt_desc
{
__le16 count;
__le16 status;
__le32 pbuf; /* physical address of data buffer */
__le32 next; /* physical address of next descriptor */
/* driver book keeping */
char *buf; /* virtual address of data buffer */
unsigned int pdesc; /* physical address of this descriptor */
dma_addr_t buf_dma_addr;
unsigned short buf_count;
};
#define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
#define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b))
#define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b))
#define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
#define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
#define desc_count(a) (le16_to_cpu((a).count))
#define desc_status(a) (le16_to_cpu((a).status))
#define desc_complete(a) (le16_to_cpu((a).status) & BIT15)
#define desc_eof(a) (le16_to_cpu((a).status) & BIT2)
#define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1)
#define desc_abort(a) (le16_to_cpu((a).status) & BIT0)
#define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3)
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
*/
struct slgt_info {
void *if_ptr; /* General purpose pointer (used by SPPP) */
struct tty_port port;
struct slgt_info *next_device; /* device list link */
int magic;
char device_name[25];
struct pci_dev *pdev;
int port_count; /* count of ports on adapter */
int adapter_num; /* adapter instance number */
int port_num; /* port instance number */
/* array of pointers to port contexts on this adapter */
struct slgt_info *port_array[SLGT_MAX_PORTS];
int line; /* tty line instance number */
struct mgsl_icount icount;
int timeout;
int x_char; /* xon/xoff character */
unsigned int read_status_mask;
unsigned int ignore_status_mask;
wait_queue_head_t status_event_wait_q;
wait_queue_head_t event_wait_q;
struct timer_list tx_timer;
struct timer_list rx_timer;
unsigned int gpio_present;
struct cond_wait *gpio_wait_q;
spinlock_t lock; /* spinlock for synchronizing with ISR */
struct work_struct task;
u32 pending_bh;
bool bh_requested;
bool bh_running;
int isr_overflow;
bool irq_requested; /* true if IRQ requested */
bool irq_occurred; /* for diagnostics use */
/* device configuration */
unsigned int bus_type;
unsigned int irq_level;
unsigned long irq_flags;
unsigned char __iomem * reg_addr; /* memory mapped registers address */
u32 phys_reg_addr;
bool reg_addr_requested;
MGSL_PARAMS params; /* communications parameters */
u32 idle_mode;
u32 max_frame_size; /* as set by device config */
unsigned int rbuf_fill_level;
unsigned int rx_pio;
unsigned int if_mode;
unsigned int base_clock;
unsigned int xsync;
unsigned int xctrl;
/* device status */
bool rx_enabled;
bool rx_restart;
bool tx_enabled;
bool tx_active;
unsigned char signals; /* serial signal states */
int init_error; /* initialization error */
unsigned char *tx_buf;
int tx_count;
char *flag_buf;
bool drop_rts_on_tx_done;
struct _input_signal_events input_signal_events;
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 *bufs; /* virtual address of DMA buffer lists */
dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
unsigned int rbuf_count;
struct slgt_desc *rbufs;
unsigned int rbuf_current;
unsigned int rbuf_index;
unsigned int rbuf_fill_index;
unsigned short rbuf_fill_count;
unsigned int tbuf_count;
struct slgt_desc *tbufs;
unsigned int tbuf_current;
unsigned int tbuf_start;
unsigned char *tmp_rbuf;
unsigned int tmp_rbuf_count;
/* SPPP/Cisco HDLC device parts */
int netcount;
spinlock_t netlock;
#if SYNCLINK_GENERIC_HDLC
struct net_device *netdev;
#endif
};
static MGSL_PARAMS default_params = {
.mode = MGSL_MODE_HDLC,
.loopback = 0,
.flags = HDLC_FLAG_UNDERRUN_ABORT15,
.encoding = HDLC_ENCODING_NRZI_SPACE,
.clock_speed = 0,
.addr_filter = 0xff,
.crc_type = HDLC_CRC_16_CCITT,
.preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
.preamble = HDLC_PREAMBLE_PATTERN_NONE,
.data_rate = 9600,
.data_bits = 8,
.stop_bits = 1,
.parity = ASYNC_PARITY_NONE
};
#define BH_RECEIVE 1
#define BH_TRANSMIT 2
#define BH_STATUS 4
#define IO_PIN_SHUTDOWN_LIMIT 100
#define DMABUFSIZE 256
#define DESC_LIST_SIZE 4096
#define MASK_PARITY BIT1
#define MASK_FRAMING BIT0
#define MASK_BREAK BIT14
#define MASK_OVERRUN BIT4
#define GSR 0x00 /* global status */
#define JCR 0x04 /* JTAG control */
#define IODR 0x08 /* GPIO direction */
#define IOER 0x0c /* GPIO interrupt enable */
#define IOVR 0x10 /* GPIO value */
#define IOSR 0x14 /* GPIO interrupt status */
#define TDR 0x80 /* tx data */
#define RDR 0x80 /* rx data */
#define TCR 0x82 /* tx control */
#define TIR 0x84 /* tx idle */
#define TPR 0x85 /* tx preamble */
#define RCR 0x86 /* rx control */
#define VCR 0x88 /* V.24 control */
#define CCR 0x89 /* clock control */
#define BDR 0x8a /* baud divisor */
#define SCR 0x8c /* serial control */
#define SSR 0x8e /* serial status */
#define RDCSR 0x90 /* rx DMA control/status */
#define TDCSR 0x94 /* tx DMA control/status */
#define RDDAR 0x98 /* rx DMA descriptor address */
#define TDDAR 0x9c /* tx DMA descriptor address */
#define XSR 0x40 /* extended sync pattern */
#define XCR 0x44 /* extended control */
#define RXIDLE BIT14
#define RXBREAK BIT14
#define IRQ_TXDATA BIT13
#define IRQ_TXIDLE BIT12
#define IRQ_TXUNDER BIT11 /* HDLC */
#define IRQ_RXDATA BIT10
#define IRQ_RXIDLE BIT9 /* HDLC */
#define IRQ_RXBREAK BIT9 /* async */
#define IRQ_RXOVER BIT8
#define IRQ_DSR BIT7
#define IRQ_CTS BIT6
#define IRQ_DCD BIT5
#define IRQ_RI BIT4
#define IRQ_ALL 0x3ff0
#define IRQ_MASTER BIT0
#define slgt_irq_on(info, mask) \
wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
#define slgt_irq_off(info, mask) \
wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
static void msc_set_vcr(struct slgt_info *info);
static int startup(struct slgt_info *info);
static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
static void shutdown(struct slgt_info *info);
static void program_hw(struct slgt_info *info);
static void change_params(struct slgt_info *info);
static int register_test(struct slgt_info *info);
static int irq_test(struct slgt_info *info);
static int loopback_test(struct slgt_info *info);
static int adapter_test(struct slgt_info *info);
static void reset_adapter(struct slgt_info *info);
static void reset_port(struct slgt_info *info);
static void async_mode(struct slgt_info *info);
static void sync_mode(struct slgt_info *info);
static void rx_stop(struct slgt_info *info);
static void rx_start(struct slgt_info *info);
static void reset_rbufs(struct slgt_info *info);
static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
static void rdma_reset(struct slgt_info *info);
static bool rx_get_frame(struct slgt_info *info);
static bool rx_get_buf(struct slgt_info *info);
static void tx_start(struct slgt_info *info);
static void tx_stop(struct slgt_info *info);
static void tx_set_idle(struct slgt_info *info);
static unsigned int free_tbuf_count(struct slgt_info *info);
static unsigned int tbuf_bytes(struct slgt_info *info);
static void reset_tbufs(struct slgt_info *info);
static void tdma_reset(struct slgt_info *info);
static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count);
static void get_signals(struct slgt_info *info);
static void set_signals(struct slgt_info *info);
static void enable_loopback(struct slgt_info *info);
static void set_rate(struct slgt_info *info, u32 data_rate);
static int bh_action(struct slgt_info *info);
static void bh_handler(struct work_struct *work);
static void bh_transmit(struct slgt_info *info);
static void isr_serial(struct slgt_info *info);
static void isr_rdma(struct slgt_info *info);
static void isr_txeom(struct slgt_info *info, unsigned short status);
static void isr_tdma(struct slgt_info *info);
static int alloc_dma_bufs(struct slgt_info *info);
static void free_dma_bufs(struct slgt_info *info);
static int alloc_desc(struct slgt_info *info);
static void free_desc(struct slgt_info *info);
static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
static int alloc_tmp_rbuf(struct slgt_info *info);
static void free_tmp_rbuf(struct slgt_info *info);
static void tx_timeout(unsigned long context);
static void rx_timeout(unsigned long context);
/*
* ioctl handlers
*/
static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
static int get_txidle(struct slgt_info *info, int __user *idle_mode);
static int set_txidle(struct slgt_info *info, int idle_mode);
static int tx_enable(struct slgt_info *info, int enable);
static int tx_abort(struct slgt_info *info);
static int rx_enable(struct slgt_info *info, int enable);
static int modem_input_wait(struct slgt_info *info,int arg);
static int wait_mgsl_event(struct slgt_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 int get_interface(struct slgt_info *info, int __user *if_mode);
static int set_interface(struct slgt_info *info, int if_mode);
static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
static int get_xsync(struct slgt_info *info, int __user *if_mode);
static int set_xsync(struct slgt_info *info, int if_mode);
static int get_xctrl(struct slgt_info *info, int __user *if_mode);
static int set_xctrl(struct slgt_info *info, int if_mode);
/*
* driver functions
*/
static void add_device(struct slgt_info *info);
static void device_init(int adapter_num, struct pci_dev *pdev);
static int claim_resources(struct slgt_info *info);
static void release_resources(struct slgt_info *info);
/*
* DEBUG OUTPUT CODE
*/
#ifndef DBGINFO
#define DBGINFO(fmt)
#endif
#ifndef DBGERR
#define DBGERR(fmt)
#endif
#ifndef DBGBH
#define DBGBH(fmt)
#endif
#ifndef DBGISR
#define DBGISR(fmt)
#endif
#ifdef DBGDATA
static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
{
int i;
int linecount;
printk("%s %s data:\n",info->device_name, label);
while(count) {
linecount = (count > 16) ? 16 : count;
for(i=0; i < linecount; i++)
printk("%02X ",(unsigned char)data[i]);
for(;i<17;i++)
printk(" ");
for(i=0;i<linecount;i++) {
if (data[i]>=040 && data[i]<=0176)
printk("%c",data[i]);
else
printk(".");
}
printk("\n");
data += linecount;
count -= linecount;
}
}
#else
#define DBGDATA(info, buf, size, label)
#endif
#ifdef DBGTBUF
static void dump_tbufs(struct slgt_info *info)
{
int i;
printk("tbuf_current=%d\n", info->tbuf_current);
for (i=0 ; i < info->tbuf_count ; i++) {
printk("%d: count=%04X status=%04X\n",
i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
}
}
#else
#define DBGTBUF(info)
#endif
#ifdef DBGRBUF
static void dump_rbufs(struct slgt_info *info)
{
int i;
printk("rbuf_current=%d\n", info->rbuf_current);
for (i=0 ; i < info->rbuf_count ; i++) {
printk("%d: count=%04X status=%04X\n",
i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
}
}
#else
#define DBGRBUF(info)
#endif
static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
{
#ifdef SANITY_CHECK
if (!info) {
printk("null struct slgt_info for (%s) in %s\n", devname, name);
return 1;
}
if (info->magic != MGSL_MAGIC) {
printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
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 */
static int open(struct tty_struct *tty, struct file *filp)
{
struct slgt_info *info;
int retval, line;
unsigned long flags;
line = tty->index;
if (line >= slgt_device_count) {
DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
return -ENODEV;
}
info = slgt_device_list;
while(info && info->line != line)
info = info->next_device;
if (sanity_check(info, tty->name, "open"))
return -ENODEV;
if (info->init_error) {
DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
return -ENODEV;
}
tty->driver_data = info;
info->port.tty = tty;
DBGINFO(("%s open, old ref count = %d\n", info->device_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;
}
mutex_lock(&info->port.mutex);
info->port.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);
mutex_unlock(&info->port.mutex);
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) {
mutex_unlock(&info->port.mutex);
goto cleanup;
}
}
mutex_unlock(&info->port.mutex);
retval = block_til_ready(tty, filp, info);
if (retval) {
DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
goto cleanup;
}
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--;
}
DBGINFO(("%s open rc=%d\n", info->device_name, retval));
return retval;
}
static void close(struct tty_struct *tty, struct file *filp)
{
struct slgt_info *info = tty->driver_data;
if (sanity_check(info, tty->name, "close"))
return;
DBGINFO(("%s close entry, count=%d\n", 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:
DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
}
static void hangup(struct tty_struct *tty)
{
struct slgt_info *info = tty->driver_data;
unsigned long flags;
if (sanity_check(info, tty->name, "hangup"))
return;
DBGINFO(("%s hangup\n", info->device_name));
flush_buffer(tty);
mutex_lock(&info->port.mutex);
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);
}
static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
{
struct slgt_info *info = tty->driver_data;
unsigned long flags;
DBGINFO(("%s set_termios\n", tty->driver->name));
change_params(info);
/* Handle transition to B0 status */
if (old_termios->c_cflag & CBAUD &&
!(tty->termios.c_cflag & CBAUD)) {
info->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->signals |= SerialSignal_DTR;
if (!(tty->termios.c_cflag & CRTSCTS) ||
!test_bit(TTY_THROTTLED, &tty->flags)) {
info->signals |= SerialSignal_RTS;
}
spin_lock_irqsave(&info->lock,flags);
set_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
}
/* Handle turning off CRTSCTS */
if (old_termios->c_cflag & CRTSCTS &&
!(tty->termios.c_cflag & CRTSCTS)) {
tty->hw_stopped = 0;
tx_release(tty);
}
}
static void update_tx_timer(struct slgt_info *info)
{
/*
* use worst case speed of 1200bps to calculate transmit timeout
* based on data in buffers (tbuf_bytes) and FIFO (128 bytes)
*/
if (info->params.mode == MGSL_MODE_HDLC) {
int timeout = (tbuf_bytes(info) * 7) + 1000;
mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout));
}
}
static int write(struct tty_struct *tty,
const unsigned char *buf, int count)
{
int ret = 0;
struct slgt_info *info = tty->driver_data;
unsigned long flags;
if (sanity_check(info, tty->name, "write"))
return -EIO;
DBGINFO(("%s write count=%d\n", info->device_name, count));
if (!info->tx_buf || (count > info->max_frame_size))
return -EIO;
if (!count || tty->stopped || tty->hw_stopped)
return 0;
spin_lock_irqsave(&info->lock, flags);
if (info->tx_count) {
/* send accumulated data from send_char() */
if (!tx_load(info, info->tx_buf, info->tx_count))
goto cleanup;
info->tx_count = 0;
}
if (tx_load(info, buf, count))
ret = count;
cleanup:
spin_unlock_irqrestore(&info->lock, flags);
DBGINFO(("%s write rc=%d\n", info->device_name, ret));
return ret;
}
static int put_char(struct tty_struct *tty, unsigned char ch)
{
struct slgt_info *info = tty->driver_data;
unsigned long flags;
int ret = 0;
if (sanity_check(info, tty->name, "put_char"))
return 0;
DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
if (!info->tx_buf)
return 0;
spin_lock_irqsave(&info->lock,flags);
if (info->tx_count < info->max_frame_size) {
info->tx_buf[info->tx_count++] = ch;
ret = 1;
}
spin_unlock_irqrestore(&info->lock,flags);
return ret;
}
static void send_xchar(struct tty_struct *tty, char ch)
{
struct slgt_info *info = tty->driver_data;
unsigned long flags;
if (sanity_check(info, tty->name, "send_xchar"))
return;
DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
info->x_char = ch;
if (ch) {
spin_lock_irqsave(&info->lock,flags);
if (!info->tx_enabled)
tx_start(info);
spin_unlock_irqrestore(&info->lock,flags);
}
}
static void wait_until_sent(struct tty_struct *tty, int timeout)
{
struct slgt_info *info = tty->driver_data;
unsigned long orig_jiffies, char_time;
if (!info )
return;
if (sanity_check(info, tty->name, "wait_until_sent"))
return;
DBGINFO(("%s wait_until_sent entry\n", info->device_name));
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);
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;
}
exit:
DBGINFO(("%s wait_until_sent exit\n", info->device_name));
}
static int write_room(struct tty_struct *tty)
{
struct slgt_info *info = tty->driver_data;
int ret;
if (sanity_check(info, tty->name, "write_room"))
return 0;
ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
DBGINFO(("%s write_room=%d\n", info->device_name, ret));
return ret;
}
static void flush_chars(struct tty_struct *tty)
{
struct slgt_info *info = tty->driver_data;
unsigned long flags;
if (sanity_check(info, tty->name, "flush_chars"))
return;
DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
if (info->tx_count <= 0 || tty->stopped ||
tty->hw_stopped || !info->tx_buf)
return;
DBGINFO(("%s flush_chars start transmit\n", info->device_name));
spin_lock_irqsave(&info->lock,flags);
if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
info->tx_count = 0;
spin_unlock_irqrestore(&info->lock,flags);
}
static void flush_buffer(struct tty_struct *tty)
{
struct slgt_info *info = tty->driver_data;
unsigned long flags;
if (sanity_check(info, tty->name, "flush_buffer"))
return;
DBGINFO(("%s flush_buffer\n", info->device_name));
spin_lock_irqsave(&info->lock, flags);
info->tx_count = 0;
spin_unlock_irqrestore(&info->lock, flags);
tty_wakeup(tty);
}
/*
* throttle (stop) transmitter
*/
static void tx_hold(struct tty_struct *tty)
{
struct slgt_info *info = tty->driver_data;
unsigned long flags;
if (sanity_check(info, tty->name, "tx_hold"))
return;