mos7840.c

linux 内核源代码

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Clean ups from Moschip version and a few ioctl implementations by:
 *	Paul B Schroeder <pschroeder "at" uplogix "dot" com>
 *
 * Originally based on drivers/usb/serial/io_edgeport.c which is:
 *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
 *      Copyright (C) 2001-2002 Greg Kroah-Hartman <[e-mail]>
 *
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/serial.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <asm/uaccess.h>

/*
 * Version Information
 */
#define DRIVER_VERSION "1.3.1"
#define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"

/*
 * 16C50 UART register defines
 */

#define LCR_BITS_5             0x00	/* 5 bits/char */
#define LCR_BITS_6             0x01	/* 6 bits/char */
#define LCR_BITS_7             0x02	/* 7 bits/char */
#define LCR_BITS_8             0x03	/* 8 bits/char */
#define LCR_BITS_MASK          0x03	/* Mask for bits/char field */

#define LCR_STOP_1             0x00	/* 1 stop bit */
#define LCR_STOP_1_5           0x04	/* 1.5 stop bits (if 5   bits/char) */
#define LCR_STOP_2             0x04	/* 2 stop bits   (if 6-8 bits/char) */
#define LCR_STOP_MASK          0x04	/* Mask for stop bits field */

#define LCR_PAR_NONE           0x00	/* No parity */
#define LCR_PAR_ODD            0x08	/* Odd parity */
#define LCR_PAR_EVEN           0x18	/* Even parity */
#define LCR_PAR_MARK           0x28	/* Force parity bit to 1 */
#define LCR_PAR_SPACE          0x38	/* Force parity bit to 0 */
#define LCR_PAR_MASK           0x38	/* Mask for parity field */

#define LCR_SET_BREAK          0x40	/* Set Break condition */
#define LCR_DL_ENABLE          0x80	/* Enable access to divisor latch */

#define MCR_DTR                0x01	/* Assert DTR */
#define MCR_RTS                0x02	/* Assert RTS */
#define MCR_OUT1               0x04	/* Loopback only: Sets state of RI */
#define MCR_MASTER_IE          0x08	/* Enable interrupt outputs */
#define MCR_LOOPBACK           0x10	/* Set internal (digital) loopback mode */
#define MCR_XON_ANY            0x20	/* Enable any char to exit XOFF mode */

#define MOS7840_MSR_CTS        0x10	/* Current state of CTS */
#define MOS7840_MSR_DSR        0x20	/* Current state of DSR */
#define MOS7840_MSR_RI         0x40	/* Current state of RI */
#define MOS7840_MSR_CD         0x80	/* Current state of CD */

/*
 * Defines used for sending commands to port
 */

#define WAIT_FOR_EVER   (HZ * 0 )	/* timeout urb is wait for ever */
#define MOS_WDR_TIMEOUT (HZ * 5 )	/* default urb timeout */

#define MOS_PORT1       0x0200
#define MOS_PORT2       0x0300
#define MOS_VENREG      0x0000
#define MOS_MAX_PORT	0x02
#define MOS_WRITE       0x0E
#define MOS_READ        0x0D

/* Requests */
#define MCS_RD_RTYPE    0xC0
#define MCS_WR_RTYPE    0x40
#define MCS_RDREQ       0x0D
#define MCS_WRREQ       0x0E
#define MCS_CTRL_TIMEOUT        500
#define VENDOR_READ_LENGTH      (0x01)

#define MAX_NAME_LEN    64

#define ZLP_REG1  0x3A		//Zero_Flag_Reg1    58
#define ZLP_REG5  0x3E		//Zero_Flag_Reg5    62

/* For higher baud Rates use TIOCEXBAUD */
#define TIOCEXBAUD     0x5462

/* vendor id and device id defines */

#define USB_VENDOR_ID_MOSCHIP           0x9710
#define MOSCHIP_DEVICE_ID_7840          0x7840
#define MOSCHIP_DEVICE_ID_7820          0x7820

/* Interrupt Rotinue Defines    */

#define SERIAL_IIR_RLS      0x06
#define SERIAL_IIR_MS       0x00

/*
 *  Emulation of the bit mask on the LINE STATUS REGISTER.
 */
#define SERIAL_LSR_DR       0x0001
#define SERIAL_LSR_OE       0x0002
#define SERIAL_LSR_PE       0x0004
#define SERIAL_LSR_FE       0x0008
#define SERIAL_LSR_BI       0x0010

#define MOS_MSR_DELTA_CTS   0x10
#define MOS_MSR_DELTA_DSR   0x20
#define MOS_MSR_DELTA_RI    0x40
#define MOS_MSR_DELTA_CD    0x80

// Serial Port register Address
#define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
#define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
#define LINE_CONTROL_REGISTER      ((__u16)(0x03))
#define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
#define LINE_STATUS_REGISTER       ((__u16)(0x05))
#define MODEM_STATUS_REGISTER      ((__u16)(0x06))
#define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
#define DIVISOR_LATCH_LSB          ((__u16)(0x00))
#define DIVISOR_LATCH_MSB          ((__u16)(0x01))

#define CLK_MULTI_REGISTER         ((__u16)(0x02))
#define CLK_START_VALUE_REGISTER   ((__u16)(0x03))

#define SERIAL_LCR_DLAB            ((__u16)(0x0080))

/*
 * URB POOL related defines
 */
#define NUM_URBS                        16	/* URB Count */
#define URB_TRANSFER_BUFFER_SIZE        32	/* URB Size  */


static struct usb_device_id moschip_port_id_table[] = {
	{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
	{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
	{}			/* terminating entry */
};

static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
	{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
	{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
	{}			/* terminating entry */
};

MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);

/* This structure holds all of the local port information */

struct moschip_port {
	int port_num;		/*Actual port number in the device(1,2,etc) */
	struct urb *write_urb;	/* write URB for this port */
	struct urb *read_urb;	/* read URB for this port */
	struct urb *int_urb;
	__u8 shadowLCR;		/* last LCR value received */
	__u8 shadowMCR;		/* last MCR value received */
	char open;
	char open_ports;
	char zombie;
	wait_queue_head_t wait_chase;	/* for handling sleeping while waiting for chase to finish */
	wait_queue_head_t delta_msr_wait;	/* for handling sleeping while waiting for msr change to happen */
	int delta_msr_cond;
	struct async_icount icount;
	struct usb_serial_port *port;	/* loop back to the owner of this object */

	/*Offsets */
	__u8 SpRegOffset;
	__u8 ControlRegOffset;
	__u8 DcrRegOffset;
	//for processing control URBS in interrupt context
	struct urb *control_urb;
	struct usb_ctrlrequest *dr;
	char *ctrl_buf;
	int MsrLsr;

	spinlock_t pool_lock;
	struct urb *write_urb_pool[NUM_URBS];
	char busy[NUM_URBS];
};


static int debug;

/*
 * mos7840_set_reg_sync
 * 	To set the Control register by calling usb_fill_control_urb function
 *	by passing usb_sndctrlpipe function as parameter.
 */

static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
				__u16 val)
{
	struct usb_device *dev = port->serial->dev;
	val = val & 0x00ff;
	dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);

	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
			       MCS_WR_RTYPE, val, reg, NULL, 0,
			       MOS_WDR_TIMEOUT);
}

/*
 * mos7840_get_reg_sync
 * 	To set the Uart register by calling usb_fill_control_urb function by
 *	passing usb_rcvctrlpipe function as parameter.
 */

static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
				__u16 * val)
{
	struct usb_device *dev = port->serial->dev;
	int ret = 0;

	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
			      MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
			      MOS_WDR_TIMEOUT);
	dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
	*val = (*val) & 0x00ff;
	return ret;
}

/*
 * mos7840_set_uart_reg
 *	To set the Uart register by calling usb_fill_control_urb function by
 *	passing usb_sndctrlpipe function as parameter.
 */

static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
				__u16 val)
{

	struct usb_device *dev = port->serial->dev;
	val = val & 0x00ff;
	// For the UART control registers, the application number need to be Or'ed
	if (port->serial->num_ports == 4) {
		val |=
		    (((__u16) port->number - (__u16) (port->serial->minor)) +
		     1) << 8;
		dbg("mos7840_set_uart_reg application number is %x\n", val);
	} else {
		if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
			val |=
			    (((__u16) port->number -
			      (__u16) (port->serial->minor)) + 1) << 8;
			dbg("mos7840_set_uart_reg application number is %x\n",
			    val);
		} else {
			val |=
			    (((__u16) port->number -
			      (__u16) (port->serial->minor)) + 2) << 8;
			dbg("mos7840_set_uart_reg application number is %x\n",
			    val);
		}
	}
	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
			       MCS_WR_RTYPE, val, reg, NULL, 0,
			       MOS_WDR_TIMEOUT);

}

/*
 * mos7840_get_uart_reg
 *	To set the Control register by calling usb_fill_control_urb function
 *	by passing usb_rcvctrlpipe function as parameter.
 */
static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
				__u16 * val)
{
	struct usb_device *dev = port->serial->dev;
	int ret = 0;
	__u16 Wval;

	//dbg("application number is %4x \n",(((__u16)port->number - (__u16)(port->serial->minor))+1)<<8);
	/*Wval  is same as application number */
	if (port->serial->num_ports == 4) {
		Wval =
		    (((__u16) port->number - (__u16) (port->serial->minor)) +
		     1) << 8;
		dbg("mos7840_get_uart_reg application number is %x\n", Wval);
	} else {
		if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
			Wval =
			    (((__u16) port->number -
			      (__u16) (port->serial->minor)) + 1) << 8;
			dbg("mos7840_get_uart_reg application number is %x\n",
			    Wval);
		} else {
			Wval =
			    (((__u16) port->number -
			      (__u16) (port->serial->minor)) + 2) << 8;
			dbg("mos7840_get_uart_reg application number is %x\n",
			    Wval);
		}
	}
	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
			      MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
			      MOS_WDR_TIMEOUT);
	*val = (*val) & 0x00ff;
	return ret;
}

static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
{

	dbg("***************************************\n");
	dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
	dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
	dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
	dbg("***************************************\n");

}

/************************************************************************/
/************************************************************************/
/*             I N T E R F A C E   F U N C T I O N S			*/
/*             I N T E R F A C E   F U N C T I O N S			*/
/************************************************************************/
/************************************************************************/

static inline void mos7840_set_port_private(struct usb_serial_port *port,
					    struct moschip_port *data)
{
	usb_set_serial_port_data(port, (void *)data);
}

static inline struct moschip_port *mos7840_get_port_private(struct
							    usb_serial_port
							    *port)
{
	return (struct moschip_port *)usb_get_serial_port_data(port);
}

static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
{
	struct moschip_port *mos7840_port;
	struct async_icount *icount;
	mos7840_port = port;
	icount = &mos7840_port->icount;
	if (new_msr &
	    (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
	     MOS_MSR_DELTA_CD)) {
		icount = &mos7840_port->icount;

		/* update input line counters */
		if (new_msr & MOS_MSR_DELTA_CTS) {
			icount->cts++;
			smp_wmb();
		}
		if (new_msr & MOS_MSR_DELTA_DSR) {
			icount->dsr++;
			smp_wmb();
		}
		if (new_msr & MOS_MSR_DELTA_CD) {
			icount->dcd++;
			smp_wmb();
		}
		if (new_msr & MOS_MSR_DELTA_RI) {
			icount->rng++;
			smp_wmb();
		}
	}
}

static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
{
	struct async_icount *icount;

	dbg("%s - %02x", __FUNCTION__, new_lsr);

	if (new_lsr & SERIAL_LSR_BI) {
		//
		// Parity and Framing errors only count if they
		// occur exclusive of a break being
		// received.
		//
		new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
	}

	/* update input line counters */
	icount = &port->icount;
	if (new_lsr & SERIAL_LSR_BI) {
		icount->brk++;
		smp_wmb();
	}
	if (new_lsr & SERIAL_LSR_OE) {
		icount->overrun++;
		smp_wmb();
	}
	if (new_lsr & SERIAL_LSR_PE) {
		icount->parity++;
		smp_wmb();
	}
	if (new_lsr & SERIAL_LSR_FE) {
		icount->frame++;
		smp_wmb();
	}
}

/************************************************************************/
/************************************************************************/
/*            U S B  C A L L B A C K   F U N C T I O N S                */
/*            U S B  C A L L B A C K   F U N C T I O N S                */
/************************************************************************/
/************************************************************************/

static void mos7840_control_callback(struct urb *urb)
{
	unsigned char *data;
	struct moschip_port *mos7840_port;
	__u8 regval = 0x0;
	int result = 0;
	int status = urb->status;

	mos7840_port = (struct moschip_port *)urb->context;

	switch (status) {
	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
		dbg("%s - urb shutting down with status: %d", __FUNCTION__,
		    status);
		return;
	default:
		dbg("%s - nonzero urb status received: %d", __FUNCTION__,
		    status);
		goto exit;
	}

	dbg("%s urb buffer size is %d\n", __FUNCTION__, urb->actual_length);
	dbg("%s mos7840_port->MsrLsr is %d port %d\n", __FUNCTION__,
	    mos7840_port->MsrLsr, mos7840_port->port_num);
	data = urb->transfer_buffer;
	regval = (__u8) data[0];
	dbg("%s data is %x\n", __FUNCTION__, regval);
	if (mos7840_port->MsrLsr == 0)
		mos7840_handle_new_msr(mos7840_port, regval);
	else if (mos7840_port->MsrLsr == 1)
		mos7840_handle_new_lsr(mos7840_port, regval);

exit:
	spin_lock(&mos7840_port->pool_lock);
	if (!mos7840_port->zombie)
		result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
	spin_unlock(&mos7840_port->pool_lock);
	if (result) {
		dev_err(&urb->dev->dev,
			"%s - Error %d submitting interrupt urb\n",
			__FUNCTION__, result);
	}
}

static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
			   __u16 * val)