struct mutex open_lock;
struct sdio_func *func;
struct mutex func_lock;
+ struct task_struct *in_sdio_uart_irq;
unsigned int regs_offset;
struct circ_buf xmit;
spinlock_t write_lock;
mutex_unlock(&port->func_lock);
return -ENODEV;
}
- sdio_claim_host(port->func);
+ if (likely(port->in_sdio_uart_irq != current))
+ sdio_claim_host(port->func);
mutex_unlock(&port->func_lock);
return 0;
}
static inline void sdio_uart_release_func(struct sdio_uart_port *port)
{
- sdio_release_host(port->func);
+ if (likely(port->in_sdio_uart_irq != current))
+ sdio_release_host(port->func);
}
static inline unsigned int sdio_in(struct sdio_uart_port *port, int offset)
sdio_out(port, UART_IER, port->ier);
}
-static void sdio_uart_receive_chars(struct sdio_uart_port *port, int *status)
+static void sdio_uart_receive_chars(struct sdio_uart_port *port, unsigned int *status)
{
struct tty_struct *tty = port->tty;
unsigned int ch, flag;
struct sdio_uart_port *port = sdio_get_drvdata(func);
unsigned int iir, lsr;
+ /*
+ * In a few places sdio_uart_irq() is called directly instead of
+ * waiting for the actual interrupt to be raised and the SDIO IRQ
+ * thread scheduled in order to reduce latency. However, some
+ * interaction with the tty core may end up calling us back
+ * (serial echo, flow control, etc.) through those same places
+ * causing undesirable effects. Let's stop the recursion here.
+ */
+ if (unlikely(port->in_sdio_uart_irq == current))
+ return;
+
iir = sdio_in(port, UART_IIR);
if (iir & UART_IIR_NO_INT)
return;
+
+ port->in_sdio_uart_irq = current;
lsr = sdio_in(port, UART_LSR);
if (lsr & UART_LSR_DR)
sdio_uart_receive_chars(port, &lsr);
sdio_uart_check_modem_status(port);
if (lsr & UART_LSR_THRE)
sdio_uart_transmit_chars(port);
+ port->in_sdio_uart_irq = NULL;
}
static int sdio_uart_startup(struct sdio_uart_port *port)
return result;
}
+static int sdio_uart_read_proc(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ int i, len = 0;
+ off_t begin = 0;
+
+ len += sprintf(page, "serinfo:1.0 driver%s%s revision:%s\n",
+ "", "", "");
+ for (i = 0; i < UART_NR && len < PAGE_SIZE - 96; i++) {
+ struct sdio_uart_port *port = sdio_uart_port_get(i);
+ if (port) {
+ len += sprintf(page+len, "%d: uart:SDIO", i);
+ if(capable(CAP_SYS_ADMIN)) {
+ len += sprintf(page + len, " tx:%d rx:%d",
+ port->icount.tx, port->icount.rx);
+ if (port->icount.frame)
+ len += sprintf(page + len, " fe:%d",
+ port->icount.frame);
+ if (port->icount.parity)
+ len += sprintf(page + len, " pe:%d",
+ port->icount.parity);
+ if (port->icount.brk)
+ len += sprintf(page + len, " brk:%d",
+ port->icount.brk);
+ if (port->icount.overrun)
+ len += sprintf(page + len, " oe:%d",
+ port->icount.overrun);
+ if (port->icount.cts)
+ len += sprintf(page + len, " cts:%d",
+ port->icount.cts);
+ if (port->icount.dsr)
+ len += sprintf(page + len, " dsr:%d",
+ port->icount.dsr);
+ if (port->icount.rng)
+ len += sprintf(page + len, " rng:%d",
+ port->icount.rng);
+ if (port->icount.dcd)
+ len += sprintf(page + len, " dcd:%d",
+ port->icount.dcd);
+ }
+ strcat(page, "\n");
+ len++;
+ sdio_uart_port_put(port);
+ }
+
+ if (len + begin > off + count)
+ goto done;
+ if (len + begin < off) {
+ begin += len;
+ len = 0;
+ }
+ }
+ *eof = 1;
+
+done:
+ if (off >= len + begin)
+ return 0;
+ *start = page + (off - begin);
+ return (count < begin + len - off) ? count : (begin + len - off);
+}
+
static const struct tty_operations sdio_uart_ops = {
.open = sdio_uart_open,
.close = sdio_uart_close,
.break_ctl = sdio_uart_break_ctl,
.tiocmget = sdio_uart_tiocmget,
.tiocmset = sdio_uart_tiocmset,
+ .read_proc = sdio_uart_read_proc,
};
static struct tty_driver *sdio_uart_tty_driver;
tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
tty_drv->init_termios = tty_std_termios;
tty_drv->init_termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL;
+ tty_drv->init_termios.c_ispeed = 4800;
+ tty_drv->init_termios.c_ospeed = 4800;
tty_set_operations(tty_drv, &sdio_uart_ops);
ret = tty_register_driver(tty_drv);