blob: 3e9058993e41805c0b2cd699ad836c76844fe398 [file] [log] [blame]
/*
* $Id: synclink_gt.c,v 4.50 2007/07/25 19:29:25 paulkf Exp $
*
* Device driver for Microgate SyncLink GT serial adapters.
*
* written by Paul Fulghum for Microgate Corporation
* paulkf@microgate.com
*
* Microgate and SyncLink are trademarks of Microgate Corporation
*
* This code is released under the GNU General Public License (GPL)
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* 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/version.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/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/system.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 *driver_version = "$Revision: 4.50 $";
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 = __devexit_p(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];
static int dosyncppp[MAX_DEVICES];
module_param(ttymajor, int, 0);
module_param(debug_level, int, 0);
module_param_array(maxframe, int, NULL, 0);
module_param_array(dosyncppp, int, NULL, 0);
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)");
MODULE_PARM_DESC(dosyncppp, "Enable synchronous net device, 0=disable 1=enable");
/*
* 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, struct file *file, unsigned int cmd, unsigned long arg);
static int read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
static int chars_in_buffer(struct tty_struct *tty);
static void throttle(struct tty_struct * tty);
static void unthrottle(struct tty_struct * tty);
static 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 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 if_mode;
/* 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[MAX_ASYNC_BUFFER_SIZE];
char char_buf[MAX_ASYNC_BUFFER_SIZE];
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 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;
int dosyncppp;
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 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 void tdma_start(struct slgt_info *info);
static void 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, 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 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);
/*
* 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 < 0) || (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;
}
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) {
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 (!info->port.count)
return;
if (tty_hung_up_p(filp))
goto cleanup;
if ((tty->count == 1) && (info->port.count != 1)) {
/*
* tty->count is 1 and the tty structure will be freed.
* info->port.count should be one in this case.
* if it's not, correct it so that the port is shutdown.
*/
DBGERR(("%s close: bad refcount; tty->count=1, "
"info->port.count=%d\n", info->device_name, info->port.count));
info->port.count = 1;
}
info->port.count--;
/* if at least one open remaining, leave hardware active */
if (info->port.count)
goto cleanup;
info->port.flags |= ASYNC_CLOSING;
/* set tty->closing to notify line discipline to
* only process XON/XOFF characters. Only the N_TTY
* discipline appears to use this (ppp does not).
*/
tty->closing = 1;
/* wait for transmit data to clear all layers */
if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) {
DBGINFO(("%s call tty_wait_until_sent\n", info->device_name));
tty_wait_until_sent(tty, info->port.closing_wait);
}
if (info->port.flags & ASYNC_INITIALIZED)
wait_until_sent(tty, info->timeout);
flush_buffer(tty);
tty_ldisc_flush(tty);
shutdown(info);
tty->closing = 0;
info->port.tty = NULL;
if (info->port.blocked_open) {
if (info->port.close_delay) {
msleep_interruptible(jiffies_to_msecs(info->port.close_delay));
}
wake_up_interruptible(&info->port.open_wait);
}
info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
wake_up_interruptible(&info->port.close_wait);
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;
if (sanity_check(info, tty->name, "hangup"))
return;
DBGINFO(("%s hangup\n", info->device_name));
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);
}
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 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;
unsigned int bufs_needed;
if (sanity_check(info, tty->name, "write"))
goto cleanup;
DBGINFO(("%s write count=%d\n", info->device_name, count));
if (!info->tx_buf)
goto cleanup;
if (count > info->max_frame_size) {
ret = -EIO;
goto cleanup;
}
if (!count)
goto cleanup;
if (!info->tx_active && info->tx_count) {
/* send accumulated data from send_char() */
tx_load(info, info->tx_buf, info->tx_count);
goto start;
}
bufs_needed = (count/DMABUFSIZE);
if (count % DMABUFSIZE)
++bufs_needed;
if (bufs_needed > free_tbuf_count(info))
goto cleanup;
ret = info->tx_count = count;
tx_load(info, buf, count);
goto start;
start:
if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
spin_lock_irqsave(&info->lock,flags);
if (!info->tx_active)
tx_start(info);
else
tdma_start(info);
spin_unlock_irqrestore(&info->lock,flags);
}
cleanup:
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_active && (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.
*/
lock_kernel();
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;
}
unlock_kernel();
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_active && info->tx_count) {
tx_load(info, info->tx_buf,info->tx_count);
tx_start(info);
}
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);
if (!info->tx_active)
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;
DBGINFO(("%s tx_hold\n", info->device_name));
spin_lock_irqsave(&info->lock,flags);
if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
tx_stop(info);
spin_unlock_irqrestore(&info->lock,flags);
}
/*
* release (start) transmitter
*/
static void tx_release(struct tty_struct *tty)
{
struct slgt_info *info = tty->driver_data;
unsigned long flags;
if (sanity_check(info, tty->name, "tx_release"))
return;
DBGINFO(("%s tx_release\n", info->device_name));
spin_lock_irqsave(&info->lock,flags);
if (!info->tx_active && info->tx_count) {
tx_load(info, info->tx_buf, info->tx_count);
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 0 if success, otherwise error code
*/
static int ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct slgt_info *info = tty->driver_data;
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;
int ret;
if (sanity_check(info, tty->name, "ioctl"))
return -ENODEV;
DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
(cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
}
lock_kernel();
switch (cmd) {
case MGSL_IOCGPARAMS:
ret = get_params(info, argp);
break;
case MGSL_IOCSPARAMS:
ret = set_params(info, argp);
break;
case MGSL_IOCGTXIDLE:
ret = get_txidle(info, argp);
break;
case MGSL_IOCSTXIDLE:
ret = set_txidle(info, (int)arg);
break;
case MGSL_IOCTXENABLE:
ret = tx_enable(info, (int)arg);
break;
case MGSL_IOCRXENABLE:
ret = rx_enable(info, (int)arg);
break;
case MGSL_IOCTXABORT:
ret = tx_abort(info);
break;
case MGSL_IOCGSTATS:
ret = get_stats(info, argp);
break;
case MGSL_IOCWAITEVENT:
ret = wait_mgsl_event(info, argp);
break;
case TIOCMIWAIT:
ret = modem_input_wait(info,(int)arg);
break;
case MGSL_IOCGIF:
ret = get_interface(info, argp);
break;
case MGSL_IOCSIF:
ret = set_interface(info,(int)arg);
break;
case MGSL_IOCSGPIO:
ret = set_gpio(info, argp);
break;
case MGSL_IOCGGPIO:
ret = get_gpio(info, argp);
break;
case MGSL_IOCWAITGPIO:
ret = wait_gpio(info, argp);
break;
case TIOCGICOUNT:
spin_lock_irqsave(&info->lock,flags);
cnow = info->icount;
spin_unlock_irqrestore(&info->lock,flags);
p_cuser = argp;
if (put_user(cnow.cts, &p_cuser->cts) ||
put_user(cnow.dsr, &p_cuser->dsr) ||
put_user(cnow.rng, &p_cuser->rng) ||
put_user(cnow.dcd, &p_cuser->dcd) ||
put_user(cnow.rx, &p_cuser->rx) ||
put_user(cnow.tx, &p_cuser->tx) ||
put_user(cnow.frame, &p_cuser->frame) ||
put_user(cnow.overrun, &p_cuser->overrun) ||
put_user(cnow.parity, &p_cuser->parity) ||
put_user(cnow.brk, &p_cuser->brk) ||
put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
ret = -EFAULT;
ret = 0;
break;
default:
ret = -ENOIOCTLCMD;
}
unlock_kernel();
return ret;
}
/*
* support for 32 bit ioctl calls on 64 bit systems
*/
#ifdef CONFIG_COMPAT
static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
{
struct MGSL_PARAMS32 tmp_params;
DBGINFO(("%s get_params32\n", info->device_name));
tmp_params.mode = (compat_ulong_t)info->params.mode;
tmp_params.loopback = info->params.loopback;
tmp_params.flags = info->params.flags;
tmp_params.encoding = info->params.encoding;
tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed;
tmp_params.addr_filter = info->params.addr_filter;
tmp_params.crc_type = info->params.crc_type;
tmp_params.preamble_length = info->params.preamble_length;
tmp_params.preamble = info->params.preamble;
tmp_params.data_rate = (compat_ulong_t)info->params.data_rate;
tmp_params.data_bits = info->params.data_bits;
tmp_params.stop_bits = info->params.stop_bits;
tmp_params.parity = info->params.parity;
if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
return -EFAULT;
return 0;
}
static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
{
struct MGSL_PARAMS32 tmp_params;
DBGINFO(("%s set_params32\n", info->device_name));
if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
return -EFAULT;
spin_lock(&info->lock);
info->params.mode = tmp_params.mode;
info->params.loopback = tmp_params.loopback;
info->params.flags = tmp_params.flags;
info->params.encoding = tmp_params.encoding;
info->params.clock_speed = tmp_params.clock_speed;
info->params.addr_filter = tmp_params.addr_filter;
info->params.crc_type = tmp_params.crc_type;
info->params.preamble_length = tmp_params.preamble_length;
info->params.preamble = tmp_params.preamble;
info->params.data_rate = tmp_params.data_rate;
info->params.data_bits = tmp_params.data_bits;
info->params.stop_bits = tmp_params.stop_bits;
info->params.parity = tmp_params.parity;
spin_unlock(&info->lock);
change_params(info);
return 0;
}
static long slgt_compat_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct slgt_info *info = tty->driver_data;
int rc = -ENOIOCTLCMD;
if (sanity_check(info, tty->name, "compat_ioctl"))
return -ENODEV;
DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
switch (cmd) {
case MGSL_IOCSPARAMS32:
rc = set_params32(info, compat_ptr(arg));
break;
case MGSL_IOCGPARAMS32:
rc = get_params32(info, compat_ptr(arg));
break;
case MGSL_IOCGPARAMS:
case MGSL_IOCSPARAMS:
case MGSL_IOCGTXIDLE:
case MGSL_IOCGSTATS:
case MGSL_IOCWAITEVENT:
case MGSL_IOCGIF:
case MGSL_IOCSGPIO:
case MGSL_IOCGGPIO:
case MGSL_IOCWAITGPIO:
case TIOCGICOUNT:
rc = ioctl(tty, file, cmd, (unsigned long)(compat_ptr(arg)));
break;
case MGSL_IOCSTXIDLE:
case MGSL_IOCTXENABLE:
case MGSL_IOCRXENABLE:
case MGSL_IOCTXABORT:
case TIOCMIWAIT:
case MGSL_IOCSIF:
rc = ioctl(tty, file, cmd, arg);
break;
}
DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
return rc;
}
#else
#define slgt_compat_ioctl NULL
#endif /* ifdef CONFIG_COMPAT */
/*
* proc fs support
*/
static inline int line_info(char *buf, struct slgt_info *info)
{
char stat_buf[30];
int ret;
unsigned long flags;
ret = sprintf(buf, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
info->device_name, info->phys_reg_addr,
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->signals & SerialSignal_RTS)
strcat(stat_buf, "|RTS");
if (info->signals & SerialSignal_CTS)
strcat(stat_buf, "|CTS");
if (info->signals & SerialSignal_DTR)
strcat(stat_buf, "|DTR");
if (info->signals & SerialSignal_DSR)
strcat(stat_buf, "|DSR");
if (info->signals & SerialSignal_DCD)
strcat(stat_buf, "|CD");
if (info->signals & SerialSignal_RI)
strcat(stat_buf, "|RI");
if (info->params.mode != MGSL_MODE_ASYNC) {
ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
info->icount.txok, info->icount.rxok);
if (info->icount.txunder)
ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
if (info->icount.txabort)
ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
if (info->icount.rxshort)
ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
if (info->icount.rxlong)
ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
if (info->icount.rxover)
ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
if (info->icount.rxcrc)
ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
} else {
ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
info->icount.tx, info->icount.rx);
if (info->icount.frame)
ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
if (info->icount.parity)
ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
if (info->icount.brk)
ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
if (info->icount.overrun)
ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
}
/* Append serial signal status to end */
ret += sprintf(buf+ret, " %s\n", stat_buf+1);
ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
info->tx_active,info->bh_requested,info->bh_running,
info->pending_bh);
return ret;
}
/* Called to print information about devices
*/
static int read_proc(char *page, char **start, off_t off, int count,
int *eof, void *data)
{
int len = 0, l;
off_t begin = 0;
struct slgt_info *info;
len += sprintf(page, "synclink_gt driver:%s\n", driver_version);
info = slgt_device_list;
while( info ) {
l = line_info(page + len, info);
len += l;
if (len+begin > off+count)
goto done;
if (len+begin < off) {
begin += len;
len = 0;
}
info = info->next_device;
}
*eof = 1;
done:
if (off >= len+begin)
return 0;
*start = page + (off-begin);
return ((count < begin+len-off) ? count : begin+len-off);
}
/*
* return count of bytes in transmit buffer
*/
static int chars_in_buffer(struct tty_struct *tty)
{
struct slgt_info *info = tty->driver_data;
int count;
if (sanity_check(info, tty->name, "chars_in_buffer"))
return 0;
count = tbuf_bytes(info);
DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
return count;
}
/*
* signal remote device to throttle send data (our receive data)
*/
static void throttle(struct tty_struct * tty)
{
struct slgt_info *info = tty->driver_data;
unsigned long flags;
if (sanity_check(info, tty->name, "throttle"))
return;
DBGINFO(("%s throttle\n", info->device_name));
if (I_IXOFF(tty))
send_xchar(tty, STOP_CHAR(tty));
if (tty->termios->c_cflag & CRTSCTS) {
spin_lock_irqsave(&info->lock,flags);
info->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)
{
struct slgt_info *info = tty->driver_data;
unsigned long flags;
if (sanity_check(info, tty->name, "unthrottle"))
return;
DBGINFO(("%s unthrottle\n", info->device_name));
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->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)
{
struct slgt_info *info = tty->driver_data;
unsigned short value;
unsigned long flags;
if (sanity_check(info, tty->name, "set_break"))
return -EINVAL;
DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
spin_lock_irqsave(&info->lock,flags);
value = rd_reg16(info, TCR);
if (break_state == -1)
value |= BIT6;
else
value &= ~BIT6;
wr_reg16(info, TCR, value);
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)
{
struct slgt_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;
DBGINFO(("%s hdlcdev_attach\n", info->device_name));
switch (encoding)
{
case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
default: return -EINVAL;
}
switch (parity)
{
case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
default: return -EINVAL;
}
info->params.encoding = new_encoding;
info->params.crc_type = new_crctype;
/* if network interface up, reprogram hardware */
if (info->netcount)
program_hw(info);
return 0;
}
/**
* called by generic HDLC layer to send frame
*
* skb socket buffer containing HDLC frame
* dev pointer to network device structure
*
* returns 0 if success, otherwise error code
*/
static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct slgt_info *info = dev_to_port(dev);
unsigned long flags;
DBGINFO(("%s hdlc_xmit\n", dev->name));
/* stop sending until this frame completes */
netif_stop_queue(dev);
/* copy data to device buffers */
info->tx_count = skb->len;
tx_load(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 0;
}
/**
* called by network layer when interface enabled
* claim resources and initialize hardware
*
* dev pointer to network device structure
*
* returns 0 if success, otherwise error code
*/
static int hdlcdev_open(struct net_device *dev)
{
struct slgt_info *info = dev_to_port(dev);
int rc;
unsigned long flags;
if (!try_module_get(THIS_MODULE))
return -EBUSY;
DBGINFO(("%s hdlcdev_open\n", 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) {
DBGINFO(("%s hdlc_open 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->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->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)
{
struct slgt_info *info = dev_to_port(dev);
unsigned long flags;
DBGINFO(("%s hdlcdev_close\n", 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);
module_put(THIS_MODULE);
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;
struct slgt_info *info = dev_to_port(dev);
unsigned int flags;
DBGINFO(("%s hdlcdev_ioctl\n", 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)
{
struct slgt_info *info = dev_to_port(dev);
unsigned long flags;
DBGINFO(("%s hdlcdev_tx_timeout\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(struct slgt_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(struct slgt_info *info, char *buf, int size)
{
struct sk_buff *skb = dev_alloc_skb(size);
struct net_device *dev = info->netdev;
DBGINFO(("%s hdlcdev_rx\n", dev->name));
if (skb == NULL) {
DBGERR(("%s: can't alloc skb, drop 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);
dev->last_rx = jiffies;
}
/**
* called by device driver when adding device instance
* do generic HDLC initialization
*
* info pointer to device instance information
*
* returns 0 if success, otherwise error code
*/
static int hdlcdev_init(struct slgt_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 alloc failure\n", info->device_name);
return -ENOMEM;
}
/* for network layer reporting purposes only */
dev->mem_start = info->phys_reg_addr;
dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
dev->irq = info->irq_level;
/* network layer callbacks and settings */
dev->do_ioctl = hdlcdev_ioctl;
dev->open = hdlcdev_open;
dev->stop = hdlcdev_close;
dev->tx_timeout = hdlcdev_tx_timeout;
dev->watchdog_timeo = 10*HZ;
dev->tx_queue_len = 50;
/* generic HDLC layer callbacks and settings */
hdlc = dev_to_hdlc(dev);
hdlc->attach = hdlcdev_attach;
hdlc->xmit = hdlcdev_xmit;
/* register objects with HDLC layer */
if ((rc = register_hdlc_device(dev))) {
printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
free_netdev(dev);
return rc;
}
info->netdev = dev;
return 0;
}
/**
* called by device driver when removing device instance
* do generic HDLC cleanup
*
* info pointer to device instance information
*/
static void hdlcdev_exit(struct slgt_info *info)
{
unregister_hdlc_device(info->netdev);
free_netdev(info->netdev);
info->netdev = NULL;
}
#endif /* ifdef CONFIG_HDLC */
/*
* get async data from rx DMA buffers
*/
static void rx_async(struct slgt_info *info)
{
struct tty_struct *tty = info->port.tty;
struct mgsl_icount *icount = &info->icount;
unsigned int start, end;
unsigned char *p;
unsigned char status;
struct slgt_desc *bufs = info->rbufs;
int i, count;
int chars = 0;
int stat;
unsigned char ch;
start = end = info->rbuf_current;
while(desc_complete(bufs[end])) {
count = desc_count(bufs[end]) - info->rbuf_index;
p = bufs[end].buf + info->rbuf_index;
DBGISR(("%s rx_async count=%d\n", info->device_name, count));
DBGDATA(info, p, count, "rx");
for(i=0 ; i < count; i+=2, p+=2) {
ch = *p;
icount->rx++;
stat = 0;
if ((status = *(p+1) & (BIT1 + BIT0))) {
if (status & BIT1)
icount->parity++;
else if (status & BIT0)
icount->frame++;
/* discard char if tty control flags say so */
if (status & info->ignore_status_mask)
continue;
if (status & BIT1)
stat = TTY_PARITY;
else if (status & BIT0)
stat = TTY_FRAME;
}
if (tty) {
tty_insert_flip_char(tty, ch, stat);
chars++;
}
}
if (i < count) {
/* receive buffer not completed */
info->rbuf_index += i;
mod_timer(&info->rx_timer, jiffies + 1);
break;
}
info->rbuf_index = 0;
free_rbufs(info, end, end);
if (++end == info->rbuf_count)
end = 0;
/* if entire list searched then no frame available */
if (end == start)
break;
}
if (tty && chars)
tty_flip_buffer_push(tty);
}
/*
* return next bottom half action to perform
*/
static int bh_action(struct slgt_info *info)
{
unsigned long flags;
int rc;
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;
} else {
/* Mark BH routine as complete */
info->bh_running = false;
info->bh_requested = false;
rc = 0;
}
spin_unlock_irqrestore(&info->lock,flags);
return rc;
}
/*
* perform bottom half processing
*/
static void bh_handler(struct work_struct *work)
{
struct slgt_info *info = container_of(work, struct slgt_info, task);
int action;
if (!info)
return;
info->bh_running = true;
while((action = bh_action(info))) {
switch (action) {
case BH_RECEIVE:
DBGBH(("%s bh receive\n", info->device_name));
switch(info->params.mode) {
case MGSL_MODE_ASYNC:
rx_async(info);
break;
case MGSL_MODE_HDLC:
while(rx_get_frame(info));
break;
case MGSL_MODE_RAW:
case MGSL_MODE_MONOSYNC:
case MGSL_MODE_BISYNC:
while(rx_get_buf(info));
break;
}
/* restart receiver if rx DMA buffers exhausted */
if (info->rx_restart)
rx_start(info);
break;
case BH_TRANSMIT:
bh_transmit(info);
break;
case BH_STATUS:
DBGBH(("%s bh status\n", info->device_name));
info->ri_chkcount = 0;
info->dsr_chkcount = 0;
info->dcd_chkcount = 0;
info->cts_chkcount = 0;
break;
default:
DBGBH(("%s unknown action\n", info->device_name));
break;
}
}
DBGBH(("%s bh_handler exit\n", info->device_name));
}
static void bh_transmit(struct slgt_info *info)
{
struct tty_struct *tty = info->port.tty;
DBGBH(("%s bh_transmit\n", info->device_name));
if (tty)
tty_wakeup(tty);
}
static void dsr_change(struct slgt_info *info, unsigned short status)
{
if (status & BIT3) {
info->signals |= SerialSignal_DSR;
info->input_signal_events.dsr_up++;
} else {
info->signals &= ~SerialSignal_DSR;
info->input_signal_events.dsr_down++;
}
DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
slgt_irq_off(info, IRQ_DSR);
return;
}
info->icount.dsr++;
wake_up_interruptible(&info->status_event_wait_q);
wake_up_interruptible(&info->event_wait_q);
info->pending_bh |= BH_STATUS;
}
static void cts_change(struct slgt_info *info, unsigned short status)
{
if (status & BIT2) {
info->signals |= SerialSignal_CTS;
info->input_signal_events.cts_up++;
} else {
info->signals &= ~SerialSignal_CTS;
info->input_signal_events.cts_down++;
}
DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
slgt_irq_off(info, IRQ_CTS);
return;
}
info->icount.cts++;
wake_up_interruptible(&info->status_event_wait_q);
wake_up_interruptible(&info->event_wait_q);
info->pending_bh |= BH_STATUS;
if (info->port.flags & ASYNC_CTS_FLOW) {
if (info->port.tty) {
if (info->port.tty->hw_stopped) {
if (info->signals & SerialSignal_CTS) {
info->port.tty->hw_stopped = 0;
info->pending_bh |= BH_TRANSMIT;
return;
}
} else {
if (!(info->signals & SerialSignal_CTS))
info->port.tty->hw_stopped = 1;
}
}
}
}
static void dcd_change(struct slgt_info *info, unsigned short status)
{
if (status & BIT1) {
info->signals |= SerialSignal_DCD;
info->input_signal_events.dcd_up++;
} else {
info->signals &= ~SerialSignal_DCD;
info->input_signal_events.dcd_down++;
}
DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
slgt_irq_off(info, IRQ_DCD);
return;
}
info->icount.dcd++;
#if SYNCLINK_GENERIC_HDLC
if (info->netcount) {
if (info->signals & SerialSignal_DCD)
netif_carrier_on(info->netdev);
else
netif_carrier_off(info->netdev);
}
#endif
wake_up_interruptible(&info->status_event_wait_q);
wake_up_interruptible(&info->event_wait_q);
info->pending_bh |= BH_STATUS;
if (info->port.flags & ASYNC_CHECK_CD) {
if (info->signals & SerialSignal_DCD)
wake_up_interruptible(&info->port.open_wait);
else {
if (info->port.tty)
tty_hangup(info->port.tty);
}
}
}
static void ri_change(struct slgt_info *info, unsigned short status)
{
if (status & BIT0) {
info->signals |= SerialSignal_RI;
info->input_signal_events.ri_up++;
} else {
info->signals &= ~SerialSignal_RI;
info->input_signal_events.ri_down++;
}
DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
slgt_irq_off(info, IRQ_RI);
return;
}
info->icount.rng++;
wake_up_interruptible(&info->status_event_wait_q);
wake_up_interruptible(&info->event_wait_q);
info->pending_bh |= BH_STATUS;
}
static void isr_serial(struct slgt_info *info)
{
unsigned short status = rd_reg16(info, SSR);
DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
wr_reg16(info, SSR, status); /* clear pending */
info->irq_occurred = true;
if (info->params.mode == MGSL_MODE_ASYNC) {
if (status & IRQ_TXIDLE) {
if (info->tx_count)
isr_txeom(info, status);
}
if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
info->icount.brk++;
/* process break detection if tty control allows */
if (info->port.tty) {
if (!(status & info->ignore_status_mask)) {
if (info->read_status_mask & MASK_BREAK) {
tty_insert_flip_char(info->port.tty, 0, TTY_BREAK);
if (info->port.flags & ASYNC_SAK)
do_SAK(info->port.tty);
}
}
}
}
} else {
if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
isr_txeom(info, status);
if (status & IRQ_RXIDLE) {
if (status & RXIDLE)
info->icount.rxidle++;
else
info->icount.exithunt++;
wake_up_interruptible(&info->event_wait_q);
}
if (status & IRQ_RXOVER)
rx_start(info);
}
if (status & IRQ_DSR)
dsr_change(info, status);
if (status & IRQ_CTS)
cts_change(info, status);
if (status & IRQ_DCD)
dcd_change(info, status);
if (status & IRQ_RI)
ri_change(info, status);
}
static void isr_rdma(struct slgt_info *info)
{
unsigned int status = rd_reg32(info, RDCSR);
DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
/* RDCSR (rx DMA control/status)
*
* 31..07 reserved
* 06 save status byte to DMA buffer
* 05 error
* 04 eol (end of list)
* 03 eob (end of buffer)
* 02 IRQ enable
* 01 reset
* 00 enable
*/
wr_reg32(info, RDCSR, status); /* clear pending */
if (status & (BIT5 + BIT4)) {
DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
info->rx_restart = true;
}
info->pending_bh |= BH_RECEIVE;
}
static void isr_tdma(struct slgt_info *info)
{
unsigned int status = rd_reg32(info, TDCSR);
DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
/* TDCSR (tx DMA control/status)
*
* 31..06 reserved
* 05 error
* 04 eol (end of list)
* 03 eob (end of buffer)
* 02 IRQ enable
* 01 reset
* 00 enable
*/
wr_reg32(info, TDCSR, status); /* clear pending */
if (status & (BIT5 + BIT4 + BIT3)) {
// another transmit buffer has completed
// run bottom half to get more send data from user
info->pending_bh |= BH_TRANSMIT;
}
}
static void isr_txeom(struct slgt_info *info, unsigned short status)
{
DBGISR(("%s txeom status=%04x\n", info->device_name, status));
slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
tdma_reset(info);
reset_tbufs(info);
if (status & IRQ_TXUNDER) {
unsigned short val = rd_reg16(info, TCR);
wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
wr_reg16(info, TCR, val); /* clear reset bit */
}
if (info->tx_active) {
if (info->params.mode != MGSL_MODE_ASYNC) {
if (status & IRQ_TXUNDER)
info->icount.txunder++;
else if (status & IRQ_TXIDLE)
info->icount.txok++;
}
info->tx_active = false;
info->tx_count = 0;
del_timer(&info->tx_timer);
if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
info->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;
}
}
}
static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
{
struct cond_wait *w, *prev;
/* wake processes waiting for specific transitions */
for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
if (w->data & changed) {
w->data = state;
wake_up_interruptible(&w->q);
if (prev != NULL)
prev->next = w->next;
else
info->gpio_wait_q = w->next;
} else
prev = w;
}
}
/* interrupt service routine
*
* irq interrupt number
* dev_id device ID supplied during interrupt registration
*/
static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
{
struct slgt_info *info = dev_id;
unsigned int gsr;
unsigned int i;
DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
spin_lock(&info->lock);
while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
info->irq_occurred = true;
for(i=0; i < info->port_count ; i++) {
if (info->port_array[i] == NULL)
continue;
if (gsr & (BIT8 << i))
isr_serial(info->port_array[i]);
if (gsr & (BIT16 << (i*2)))
isr_rdma(info->port_array[i]);
if (gsr & (BIT17 << (i*2)))
isr_tdma(info->port_array[i]);
}
}
if (info->gpio_present) {
unsigned int state;
unsigned int changed;
while ((changed = rd_reg32(info, IOSR)) != 0) {
DBGISR(("%s iosr=%08x\n", info->device_name, changed));
/* read latched state of GPIO signals */
state = rd_reg32(info, IOVR);
/* clear pending GPIO interrupt bits */
wr_reg32(info, IOSR, changed);
for (i=0 ; i < info->port_count ; i++) {
if (info->port_array[i] != NULL)
isr_gpio(info->port_array[i], changed, state);
}
}
}
for(i=0; i < info->port_count ; i++) {
struct slgt_info *port = info->port_array[i];
if (port && (port->port.count || port->netcount) &&
port->pending_bh && !port->bh_running &&
!port->bh_requested) {
DBGISR(("%s bh queued\n", port->device_name));
schedule_work(&port->task);
port->bh_requested = true;
}
}
spin_unlock(&info->lock);
DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
return IRQ_HANDLED;
}
static int startup(struct slgt_info *info)
{
DBGINFO(("%s startup\n", 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) {
DBGERR(("%s can't allocate tx buffer\n", info->device_name));
return -ENOMEM;
}
}
info->pending_bh = 0;
memset(&info->icount, 0, sizeof(info->icount));
/* program hardware for current parameters */
change_params(info);
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(struct slgt_info *info)
{
unsigned long flags;
if (!(info->port.flags & ASYNC_INITIALIZED))
return;
DBGINFO(("%s shutdown\n", info->device_name));
/* clear status wait queue because status changes */
/* can't happen after shutting down the hardware */
wake_up_interruptible(&info->status_event_wait_q);
wake_up_interruptible(&info->event_wait_q);
del_timer_sync(&info->tx_timer);
del_timer_sync(&info->rx_timer);
kfree(info->tx_buf);
info->tx_buf = NULL;
spin_lock_irqsave(&info->lock,flags);
tx_stop(info);
rx_stop(info);
slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
set_signals(info);
}
flush_cond_wait(&info->gpio_wait_q);
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(struct slgt_info *info)
{
unsigned long flags;
spin_lock_irqsave(&info->lock,flags);
rx_stop(info);
tx_stop(info);
if (info->params.mode != MGSL_MODE_ASYNC ||
info->netcount)
sync_mode(info);
else
async_mode(info);
set_signals(info);
info->dcd_chkcount = 0;
info->cts_chkcount = 0;
info->ri_chkcount = 0;
info->dsr_chkcount = 0;
slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR);
get_signals(info);
if (info->netcount ||
(info->port.tty && info->port.tty->termios->c_cflag & CREAD))
rx_start(info);
spin_unlock_irqrestore(&info->lock,flags);
}
/*
* reconfigure adapter based on new parameters
*/
static void change_params(struct slgt_info *info)
{
unsigned cflag;
int bits_per_char;
if (!info->port.tty || !info->port.tty->termios)
return;
DBGINFO(("%s change_params\n", info->device_name));
cflag = info->port.tty->termios->c_cflag;
/* if B0 rate (hangup) specified then negate DTR and RTS */
/* otherwise assert DTR and RTS */
if (cflag & CBAUD)
info->signals |= SerialSignal_RTS + SerialSignal_DTR;
else
info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
/* byte size and parity */
switch (cflag & CSIZE) {
case CS5: info->params.data_bits = 5; break;
case CS6: info->params.data_bits = 6; break;
case CS7: info->params.data_bits = 7; break;
case CS8: info->params.data_bits = 8; break;
default: info->params.data_bits = 7; break;
}
info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
if (cflag & PARENB)
info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
else
info->params.parity = ASYNC_PARITY_NONE;
/* calculate number of jiffies to transmit a full
* FIFO (32 bytes) at specified data rate
*/
bits_per_char = info->params.data_bits +
info->params.stop_bits + 1;
info->params.data_rate = tty_get_baud_rate(info->port.tty);
if (info->params.data_rate) {
info->timeout = (32*HZ*bits_per_char) /
info->params.data_rate;
}
info->timeout += HZ/50; /* Add .02 seconds of slop */
if (cflag & CRTSCTS)
info->port.flags |= ASYNC_CTS_FLOW;
else
info->port.flags &= ~ASYNC_CTS_FLOW;
if (cflag & CLOCAL)
info->port.flags &= ~ASYNC_CHECK_CD;
else
info->port.flags |= ASYNC_CHECK_CD;
/* process tty input control flags */
info->read_status_mask = IRQ_RXOVER;
if (I_INPCK(info->port.tty))
info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
info->read_status_mask |= MASK_BREAK;
if (I_IGNPAR(info->port.tty))
info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
if (I_IGNBRK(info->port.tty)) {
info->ignore_status_mask |= MASK_BREAK;
/* If ignoring parity and break indicators, ignore
* overruns too. (For real raw support).
*/
if (I_IGNPAR(info->port.tty))
info->ignore_status_mask |= MASK_OVERRUN;
}
program_hw(info);
}
static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
{
DBGINFO(("%s get_stats\n", info->device_name));
if (!user_icount) {
memset(&info->icount, 0, sizeof(info->icount));
} else {
if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
return -EFAULT;
}
return 0;
}
static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
{
DBGINFO(("%s get_params\n", info->device_name));
if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
return -EFAULT;
return 0;
}
static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
{
unsigned long flags;
MGSL_PARAMS tmp_params;
DBGINFO(("%s set_params\n", info->device_name));
if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
return -EFAULT;
spin_lock_irqsave(&info->lock, flags);
memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
spin_unlock_irqrestore(&info->lock, flags);
change_params(info);
return 0;
}
static int get_txidle(struct slgt_info *info, int __user *idle_mode)
{
DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
if (put_user(info->idle_mode, idle_mode))
return -EFAULT;
return 0;
}
static int set_txidle(struct slgt_info *info, int idle_mode)
{
unsigned long flags;
DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
spin_lock_irqsave(&info->lock,flags);
info->idle_mode = idle_mode;
if (info->params.mode != MGSL_MODE_ASYNC)
tx_set_idle(info);
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}
static int tx_enable(struct slgt_info *info, int enable)
{
unsigned long flags;
DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
spin_lock_irqsave(&info->lock,flags);
if (enable) {
if (!info->tx_enabled)
tx_start(info);
} else {
if (info->tx_enabled)
tx_stop(info);
}
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}