linux-imx

/*

 *  pti.c - PTI driver for cJTAG data extration

 *

 *  Copyright (C) Intel 2010

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * 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.

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 *

 * The PTI (Parallel Trace Interface) driver directs trace data routed from

 * various parts in the system out through the Intel Penwell PTI port and

 * out of the mobile device for analysis with a debugging tool

 * (Lauterbach, Fido). This is part of a solution for the MIPI P1149.7,

 * compact JTAG, standard.

 */

​

#include <linux/init.h>

#include <linux/sched.h>

#include <linux/interrupt.h>

#include <linux/console.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/tty.h>

#include <linux/tty_driver.h>

#include <linux/pci.h>

#include <linux/mutex.h>

#include <linux/miscdevice.h>

#include <linux/intel-pti.h>

#include <linux/slab.h>

#include <linux/uaccess.h>

​

#define DRIVERNAME      "pti"

#define PCINAME         "pciPTI"

#define TTYNAME         "ttyPTI"

#define CHARNAME        "pti"

#define PTITTY_MINOR_START  0

#define PTITTY_MINOR_NUM    2

#define MAX_APP_IDS     16   /* 128 channel ids / u8 bit size */

#define MAX_OS_IDS      16   /* 128 channel ids / u8 bit size */

#define MAX_MODEM_IDS       16   /* 128 channel ids / u8 bit size */

#define MODEM_BASE_ID       71   /* modem master ID address    */

#define CONTROL_ID      72   /* control master ID address  */

#define CONSOLE_ID      73   /* console master ID address  */

#define OS_BASE_ID      74   /* base OS master ID address  */

#define APP_BASE_ID     80   /* base App master ID address */

#define CONTROL_FRAME_LEN   32   /* PTI control frame maximum size */

#define USER_COPY_SIZE      8192 /* 8Kb buffer for user space copy */

#define APERTURE_14     0x3800000 /* offset to first OS write addr */

#define APERTURE_LEN        0x400000  /* address length */

​

struct pti_tty {

    struct pti_masterchannel *mc;

};

​

struct pti_dev {

    struct tty_port port[PTITTY_MINOR_NUM];

    unsigned long pti_addr;

    unsigned long aperture_base;

    void __iomem *pti_ioaddr;

    u8 ia_app[MAX_APP_IDS];

    u8 ia_os[MAX_OS_IDS];

    u8 ia_modem[MAX_MODEM_IDS];

};

​

/*

 * This protects access to ia_app, ia_os, and ia_modem,

 * which keeps track of channels allocated in

 * an aperture write id.

 */

static DEFINE_MUTEX(alloclock);

​

static const struct pci_device_id pci_ids[] = {

        {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x82B)},

        {0}

};

​

static struct tty_driver *pti_tty_driver;

static struct pti_dev *drv_data;

​

static unsigned int pti_console_channel;

static unsigned int pti_control_channel;

​

/**

 *  pti_write_to_aperture()- The private write function to PTI HW.

 *