4 files changed, 1036 insertions, 0 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 915c31ef84cd..ec33d939548c 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -144,6 +144,19 @@ config PHANTOM
           If you choose to build module, its name will be phantom. If unsure,
           say N here.
 
+config INTEL_MID_PTI
+        tristate "Parallel Trace Interface for MIPI P1149.7 cJTAG standard"
+        default n
+        help
+          The PTI (Parallel Trace Interface) driver directs
+          trace data routed from various parts in the system out
+          through an Intel Penwell PTI port and out of the mobile
+          device for analysis with a debugging tool (Lauterbach or Fido).
+
+          You should select this driver if the target kernel is meant for
+          an Intel Atom (non-netbook) mobile device containing a MIPI
+          P1149.7 standard implementation.
+
 config SGI_IOC4
         tristate "SGI IOC4 Base IO support"
         depends on PCI
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index f5468602961f..662aa3c71d05 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_IBM_ASM)		+= ibmasm/
 obj-$(CONFIG_AD525X_DPOT)       += ad525x_dpot.o
 obj-$(CONFIG_AD525X_DPOT_I2C)   += ad525x_dpot-i2c.o
 obj-$(CONFIG_AD525X_DPOT_SPI)   += ad525x_dpot-spi.o
+0bj-$(CONFIG_INTEL_MID_PTI)     += pti.o
 obj-$(CONFIG_ATMEL_PWM)         += atmel_pwm.o
 obj-$(CONFIG_ATMEL_SSC)         += atmel-ssc.o
 obj-$(CONFIG_ATMEL_TCLIB)       += atmel_tclib.o
diff --git a/drivers/misc/pti.c b/drivers/misc/pti.c
new file mode 100644
index 000000000000..bb6f9255c17c
--- /dev/null
+++ b/drivers/misc/pti.c
@@ -0,0 +1,980 @@
+/*
+ *  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/pti.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;
+        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 struct pci_device_id pci_ids[] __devinitconst = {
+                {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.
+ *
+ *  @mc: The 'aperture'. It's part of a write address that holds
+ *       a master and channel ID.
+ *  @buf: Data being written to the HW that will ultimately be seen
+ *        in a debugging tool (Fido, Lauterbach).
+ *  @len: Size of buffer.
+ *
+ *  Since each aperture is specified by a unique
+ *  master/channel ID, no two processes will be writing
+ *  to the same aperture at the same time so no lock is required. The
+ *  PTI-Output agent will send these out in the order that they arrived, and
+ *  thus, it will intermix these messages. The debug tool can then later
+ *  regroup the appropriate message segments together reconstituting each
+ *  message.
+ */
+static void pti_write_to_aperture(struct pti_masterchannel *mc,
+                                  u8 *buf,
+                                  int len)
+{
+        int dwordcnt;
+        int final;
+        int i;
+        u32 ptiword;
+        u32 __iomem *aperture;
+        u8 *p = buf;
+
+        /*
+         * calculate the aperture offset from the base using the master and
+         * channel id's.
+         */
+        aperture = drv_data->pti_ioaddr + (mc->master << 15)
+                + (mc->channel << 8);
+
+        dwordcnt = len >> 2;
+        final = len - (dwordcnt << 2);      /* final = trailing bytes    */
+        if (final == 0 && dwordcnt != 0) {  /* always need a final dword */
+                final += 4;
+                dwordcnt--;
+        }
+
+        for (i = 0; i < dwordcnt; i++) {
+                ptiword = be32_to_cpu(*(u32 *)p);
+                p += 4;
+                iowrite32(ptiword, aperture);
+        }
+
+        aperture += PTI_LASTDWORD_DTS;  /* adding DTS signals that is EOM */
+
+        ptiword = 0;
+        for (i = 0; i < final; i++)
+                ptiword |= *p++ << (24-(8*i));
+
+        iowrite32(ptiword, aperture);
+        return;
+}
+
+/**
+ *  pti_control_frame_built_and_sent()- control frame build and send function.
+ *
+ *  @mc: The master / channel structure on which the function
+ *       built a control frame.
+ *
+ *  To be able to post process the PTI contents on host side, a control frame
+ *  is added before sending any PTI content. So the host side knows on
+ *  each PTI frame the name of the thread using a dedicated master / channel.
+ *  The thread name is retrieved from the 'current' global variable.
+ *  This function builds this frame and sends it to a master ID CONTROL_ID.
+ *  The overhead is only 32 bytes since the driver only writes to HW
+ *  in 32 byte chunks.
+ */
+
+static void pti_control_frame_built_and_sent(struct pti_masterchannel *mc)
+{
+        struct pti_masterchannel mccontrol = {.master = CONTROL_ID,
+                                              .channel = 0};
+        const char *control_format = "%3d %3d %s";
+        u8 control_frame[CONTROL_FRAME_LEN];
+
+        /*
+         * Since we access the comm member in current's task_struct,
+         * we only need to be as large as what 'comm' in that
+         * structure is.
+         */
+        char comm[TASK_COMM_LEN];
+
+        if (!in_interrupt())
+                get_task_comm(comm, current);
+        else
+                strncpy(comm, "Interrupt", TASK_COMM_LEN);
+
+        /* Absolutely ensure our buffer is zero terminated. */
+        comm[TASK_COMM_LEN-1] = 0;
+
+        mccontrol.channel = pti_control_channel;
+        pti_control_channel = (pti_control_channel + 1) & 0x7f;
+
+        snprintf(control_frame, CONTROL_FRAME_LEN, control_format, mc->master,
+                mc->channel, comm);
+        pti_write_to_aperture(&mccontrol, control_frame, strlen(control_frame));
+}
+
+/**
+ *  pti_write_full_frame_to_aperture()- high level function to
+ *                                      write to PTI.
+ *
+ *  @mc:  The 'aperture'. It's part of a write address that holds
+ *        a master and channel ID.
+ *  @buf: Data being written to the HW that will ultimately be seen
+ *        in a debugging tool (Fido, Lauterbach).
+ *  @len: Size of buffer.
+ *
+ *  All threads sending data (either console, user space application, ...)
+ *  are calling the high level function to write to PTI meaning that it is
+ *  possible to add a control frame before sending the content.
+ */
+static void pti_write_full_frame_to_aperture(struct pti_masterchannel *mc,
+                                                const unsigned char *buf,
+                                                int len)
+{
+        pti_control_frame_built_and_sent(mc);
+        pti_write_to_aperture(mc, (u8 *)buf, len);
+}
+
+/**
+ * get_id()- Allocate a master and channel ID.
+ *
+ * @id_array: an array of bits representing what channel
+ *            id's are allocated for writing.
+ * @max_ids:  The max amount of available write IDs to use.
+ * @base_id:  The starting SW channel ID, based on the Intel
+ *            PTI arch.
+ *
+ * Returns:
+ *      pti_masterchannel struct with master, channel ID address
+ *      0 for error
+ *
+ * Each bit in the arrays ia_app and ia_os correspond to a master and
+ * channel id. The bit is one if the id is taken and 0 if free. For
+ * every master there are 128 channel id's.
+ */
+static struct pti_masterchannel *get_id(u8 *id_array, int max_ids, int base_id)
+{
+        struct pti_masterchannel *mc;
+        int i, j, mask;
+
+        mc = kmalloc(sizeof(struct pti_masterchannel), GFP_KERNEL);
+        if (mc == NULL)
+                return NULL;
+
+        /* look for a byte with a free bit */
+        for (i = 0; i < max_ids; i++)
+                if (id_array[i] != 0xff)
+                        break;
+        if (i == max_ids) {
+                kfree(mc);
+                return NULL;
+        }
+        /* find the bit in the 128 possible channel opportunities */
+        mask = 0x80;
+        for (j = 0; j < 8; j++) {
+                if ((id_array[i] & mask) == 0)
+                        break;
+                mask >>= 1;
+        }
+
+        /* grab it */
+        id_array[i] |= mask;
+        mc->master  = base_id;
+        mc->channel = ((i & 0xf)<<3) + j;
+        /* write new master Id / channel Id allocation to channel control */
+        pti_control_frame_built_and_sent(mc);
+        return mc;
+}
+
+/*
+ * The following three functions:
+ * pti_request_mastercahannel(), mipi_release_masterchannel()
+ * and pti_writedata() are an API for other kernel drivers to
+ * access PTI.
+ */
+
+/**
+ * pti_request_masterchannel()- Kernel API function used to allocate
+ *                              a master, channel ID address
+ *                              to write to PTI HW.
+ *
+ * @type: 0- request Application  master, channel aperture ID write address.
+ *        1- request OS master, channel aperture ID write
+ *           address.
+ *        2- request Modem master, channel aperture ID
+ *           write address.
+ *        Other values, error.
+ *
+ * Returns:
+ *      pti_masterchannel struct
+ *      0 for error
+ */
+struct pti_masterchannel *pti_request_masterchannel(u8 type)
+{
+        struct pti_masterchannel *mc;
+
+        mutex_lock(&alloclock);
+
+        switch (type) {
+
+        case 0:
+                mc = get_id(drv_data->ia_app, MAX_APP_IDS, APP_BASE_ID);
+                break;
+
+        case 1:
+                mc = get_id(drv_data->ia_os, MAX_OS_IDS, OS_BASE_ID);
+                break;
+
+        case 2:
+                mc = get_id(drv_data->ia_modem, MAX_MODEM_IDS, MODEM_BASE_ID);
+                break;
+        default:
+                mc = NULL;
+        }
+
+        mutex_unlock(&alloclock);
+        return mc;
+}
+EXPORT_SYMBOL_GPL(pti_request_masterchannel);
+
+/**
+ * pti_release_masterchannel()- Kernel API function used to release
+ *                              a master, channel ID address
+ *                              used to write to PTI HW.
+ *
+ * @mc: master, channel apeture ID address to be released.
+ */
+void pti_release_masterchannel(struct pti_masterchannel *mc)
+{
+        u8 master, channel, i;
+
+        mutex_lock(&alloclock);
+
+        if (mc) {
+                master = mc->master;
+                channel = mc->channel;
+
+                if (master == APP_BASE_ID) {
+                        i = channel >> 3;
+                        drv_data->ia_app[i] &=  ~(0x80>>(channel & 0x7));
+                } else if (master == OS_BASE_ID) {
+                        i = channel >> 3;
+                        drv_data->ia_os[i] &= ~(0x80>>(channel & 0x7));
+                } else {
+                        i = channel >> 3;
+                        drv_data->ia_modem[i] &= ~(0x80>>(channel & 0x7));
+                }
+
+                kfree(mc);
+        }
+
+        mutex_unlock(&alloclock);
+}
+EXPORT_SYMBOL_GPL(pti_release_masterchannel);
+
+/**
+ * pti_writedata()- Kernel API function used to write trace
+ *                  debugging data to PTI HW.
+ *
+ * @mc:    Master, channel aperture ID address to write to.
+ *         Null value will return with no write occurring.
+ * @buf:   Trace debuging data to write to the PTI HW.
+ *         Null value will return with no write occurring.
+ * @count: Size of buf. Value of 0 or a negative number will
+ *         return with no write occuring.
+ */
+void pti_writedata(struct pti_masterchannel *mc, u8 *buf, int count)
+{
+        /*
+         * since this function is exported, this is treated like an
+         * API function, thus, all parameters should
+         * be checked for validity.
+         */
+        if ((mc != NULL) && (buf != NULL) && (count > 0))
+                pti_write_to_aperture(mc, buf, count);
+        return;
+}
+EXPORT_SYMBOL_GPL(pti_writedata);
+
+/**
+ * pti_pci_remove()- Driver exit method to remove PTI from
+ *                 PCI bus.
+ * @pdev: variable containing pci info of PTI.
+ */
+static void __devexit pti_pci_remove(struct pci_dev *pdev)
+{
+        struct pti_dev *drv_data;
+
+        drv_data = pci_get_drvdata(pdev);
+        if (drv_data != NULL) {
+                pci_iounmap(pdev, drv_data->pti_ioaddr);
+                pci_set_drvdata(pdev, NULL);
+                kfree(drv_data);
+                pci_release_region(pdev, 1);
+                pci_disable_device(pdev);
+        }
+}
+
+/*
+ * for the tty_driver_*() basic function descriptions, see tty_driver.h.
+ * Specific header comments made for PTI-related specifics.
+ */
+
+/**
+ * pti_tty_driver_open()- Open an Application master, channel aperture
+ * ID to the PTI device via tty device.
+ *
+ * @tty: tty interface.
+ * @filp: filp interface pased to tty_port_open() call.
+ *
+ * Returns:
+ *      int, 0 for success
+ *      otherwise, fail value
+ *
+ * The main purpose of using the tty device interface is for
+ * each tty port to have a unique PTI write aperture.  In an
+ * example use case, ttyPTI0 gets syslogd and an APP aperture
+ * ID and ttyPTI1 is where the n_tracesink ldisc hooks to route
+ * modem messages into PTI.  Modem trace data does not have to
+ * go to ttyPTI1, but ttyPTI0 and ttyPTI1 do need to be distinct
+ * master IDs.  These messages go through the PTI HW and out of
+ * the handheld platform and to the Fido/Lauterbach device.
+ */
+static int pti_tty_driver_open(struct tty_struct *tty, struct file *filp)
+{
+        /*
+         * we actually want to allocate a new channel per open, per
+         * system arch.  HW gives more than plenty channels for a single
+         * system task to have its own channel to write trace data. This
+         * also removes a locking requirement for the actual write
+         * procedure.
+         */
+        return tty_port_open(&drv_data->port, tty, filp);
+}
+
+/**
+ * pti_tty_driver_close()- close tty device and release Application
+ * master, channel aperture ID to the PTI device via tty device.
+ *
+ * @tty: tty interface.
+ * @filp: filp interface pased to tty_port_close() call.
+ *
+ * The main purpose of using the tty device interface is to route
+ * syslog daemon messages to the PTI HW and out of the handheld platform
+ * and to the Fido/Lauterbach device.
+ */
+static void pti_tty_driver_close(struct tty_struct *tty, struct file *filp)
+{
+        tty_port_close(&drv_data->port, tty, filp);
+}
+
+/**
+ * pti_tty_intstall()- Used to set up specific master-channels
+ *                     to tty ports for organizational purposes when
+ *                     tracing viewed from debuging tools.
+ *
+ * @driver: tty driver information.
+ * @tty: tty struct containing pti information.
+ *
+ * Returns:
+ *      0 for success
+ *      otherwise, error
+ */
+static int pti_tty_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+        int idx = tty->index;
+        struct pti_tty *pti_tty_data;
+        int ret = tty_init_termios(tty);
+
+        if (ret == 0) {
+                tty_driver_kref_get(driver);
+                tty->count++;
+                driver->ttys[idx] = tty;
+
+                pti_tty_data = kmalloc(sizeof(struct pti_tty), GFP_KERNEL);
+                if (pti_tty_data == NULL)
+                        return -ENOMEM;
+
+                if (idx == PTITTY_MINOR_START)
+                        pti_tty_data->mc = pti_request_masterchannel(0);
+                else
+                        pti_tty_data->mc = pti_request_masterchannel(2);
+
+                if (pti_tty_data->mc == NULL)
+                        return -ENXIO;
+                tty->driver_data = pti_tty_data;
+        }
+
+        return ret;
+}
+
+/**
+ * pti_tty_cleanup()- Used to de-allocate master-channel resources
+ *                    tied to tty's of this driver.
+ *
+ * @tty: tty struct containing pti information.
+ */
+static void pti_tty_cleanup(struct tty_struct *tty)
+{
+        struct pti_tty *pti_tty_data = tty->driver_data;
+        if (pti_tty_data == NULL)
+                return;
+        pti_release_masterchannel(pti_tty_data->mc);
+        kfree(tty->driver_data);
+        tty->driver_data = NULL;
+}
+
+/**
+ * pti_tty_driver_write()-  Write trace debugging data through the char
+ * interface to the PTI HW.  Part of the misc device implementation.
+ *
+ * @filp: Contains private data which is used to obtain
+ *        master, channel write ID.
+ * @data: trace data to be written.
+ * @len:  # of byte to write.
+ *
+ * Returns:
+ *      int, # of bytes written
+ *      otherwise, error
+ */
+static int pti_tty_driver_write(struct tty_struct *tty,
+        const unsigned char *buf, int len)
+{
+        struct pti_tty *pti_tty_data = tty->driver_data;
+        if ((pti_tty_data != NULL) && (pti_tty_data->mc != NULL)) {
+                pti_write_to_aperture(pti_tty_data->mc, (u8 *)buf, len);
+                return len;
+        }
+        /*
+         * we can't write to the pti hardware if the private driver_data
+         * and the mc address is not there.
+         */
+        else
+                return -EFAULT;
+}
+
+/**
+ * pti_tty_write_room()- Always returns 2048.
+ *
+ * @tty: contains tty info of the pti driver.
+ */
+static int pti_tty_write_room(struct tty_struct *tty)
+{
+        return 2048;
+}
+
+/**
+ * pti_char_open()- Open an Application master, channel aperture
+ * ID to the PTI device. Part of the misc device implementation.
+ *
+ * @inode: not used.
+ * @filp:  Output- will have a masterchannel struct set containing
+ *                 the allocated application PTI aperture write address.
+ *
+ * Returns:
+ *      int, 0 for success
+ *      otherwise, a fail value
+ */
+static int pti_char_open(struct inode *inode, struct file *filp)
+{
+        struct pti_masterchannel *mc;
+
+        /*
+         * We really do want to fail immediately if
+         * pti_request_masterchannel() fails,
+         * before assigning the value to filp->private_data.
+         * Slightly easier to debug if this driver needs debugging.
+         */
+        mc = pti_request_masterchannel(0);
+        if (mc == NULL)
+                return -ENOMEM;
+        filp->private_data = mc;
+        return 0;
+}
+
+/**
+ * pti_char_release()-  Close a char channel to the PTI device. Part
+ * of the misc device implementation.
+ *
+ * @inode: Not used in this implementaiton.
+ * @filp:  Contains private_data that contains the master, channel
+ *         ID to be released by the PTI device.
+ *
+ * Returns:
+ *      always 0
+ */
+static int pti_char_release(struct inode *inode, struct file *filp)
+{
+        pti_release_masterchannel(filp->private_data);
+        kfree(filp->private_data);
+        return 0;
+}
+
+/**
+ * pti_char_write()-  Write trace debugging data through the char
+ * interface to the PTI HW.  Part of the misc device implementation.
+ *
+ * @filp:  Contains private data which is used to obtain
+ *         master, channel write ID.
+ * @data:  trace data to be written.
+ * @len:   # of byte to write.
+ * @ppose: Not used in this function implementation.
+ *
+ * Returns:
+ *      int, # of bytes written
+ *      otherwise, error value
+ *
+ * Notes: From side discussions with Alan Cox and experimenting
+ * with PTI debug HW like Nokia's Fido box and Lauterbach
+ * devices, 8192 byte write buffer used by USER_COPY_SIZE was
+ * deemed an appropriate size for this type of usage with
+ * debugging HW.
+ */
+static ssize_t pti_char_write(struct file *filp, const char __user *data,
+                              size_t len, loff_t *ppose)
+{
+        struct pti_masterchannel *mc;
+        void *kbuf;
+        const char __user *tmp;
+        size_t size = USER_COPY_SIZE;
+        size_t n = 0;
+
+        tmp = data;
+        mc = filp->private_data;
+
+        kbuf = kmalloc(size, GFP_KERNEL);
+        if (kbuf == NULL)  {
+                pr_err("%s(%d): buf allocation failed\n",
+                        __func__, __LINE__);
+                return -ENOMEM;
+        }
+
+        do {
+                if (len - n > USER_COPY_SIZE)
+                        size = USER_COPY_SIZE;
+                else
+                        size = len - n;
+
+                if (copy_from_user(kbuf, tmp, size)) {
+                        kfree(kbuf);
+                        return n ? n : -EFAULT;
+                }
+
+                pti_write_to_aperture(mc, kbuf, size);
+                n  += size;
+                tmp += size;
+
+        } while (len > n);
+
+        kfree(kbuf);
+        return len;
+}
+
+static const struct tty_operations pti_tty_driver_ops = {
+        .open           = pti_tty_driver_open,
+        .close          = pti_tty_driver_close,
+        .write          = pti_tty_driver_write,
+        .write_room     = pti_tty_write_room,
+        .install        = pti_tty_install,
+        .cleanup        = pti_tty_cleanup
+};
+
+static const struct file_operations pti_char_driver_ops = {
+        .owner          = THIS_MODULE,
+        .write          = pti_char_write,
+        .open           = pti_char_open,
+        .release        = pti_char_release,
+};
+
+static struct miscdevice pti_char_driver = {
+        .minor          = MISC_DYNAMIC_MINOR,
+        .name           = CHARNAME,
+        .fops           = &pti_char_driver_ops
+};
+
+/**
+ * pti_console_write()-  Write to the console that has been acquired.
+ *
+ * @c:   Not used in this implementaiton.
+ * @buf: Data to be written.
+ * @len: Length of buf.
+ */
+static void pti_console_write(struct console *c, const char *buf, unsigned len)
+{
+        static struct pti_masterchannel mc = {.master  = CONSOLE_ID,
+                                              .channel = 0};
+
+        mc.channel = pti_console_channel;
+        pti_console_channel = (pti_console_channel + 1) & 0x7f;
+
+        pti_write_full_frame_to_aperture(&mc, buf, len);
+}
+
+/**
+ * pti_console_device()-  Return the driver tty structure and set the
+ *                        associated index implementation.
+ *
+ * @c:     Console device of the driver.
+ * @index: index associated with c.
+ *
+ * Returns:
+ *      always value of pti_tty_driver structure when this function
+ *      is called.
+ */
+static struct tty_driver *pti_console_device(struct console *c, int *index)
+{
+        *index = c->index;
+        return pti_tty_driver;
+}
+
+/**
+ * pti_console_setup()-  Initialize console variables used by the driver.
+ *
+ * @c:     Not used.
+ * @opts:  Not used.
+ *
+ * Returns:
+ *      always 0.
+ */
+static int pti_console_setup(struct console *c, char *opts)
+{
+        pti_console_channel = 0;
+        pti_control_channel = 0;
+        return 0;
+}
+
+/*
+ * pti_console struct, used to capture OS printk()'s and shift
+ * out to the PTI device for debugging.  This cannot be
+ * enabled upon boot because of the possibility of eating
+ * any serial console printk's (race condition discovered).
+ * The console should be enabled upon when the tty port is
+ * used for the first time.  Since the primary purpose for
+ * the tty port is to hook up syslog to it, the tty port
+ * will be open for a really long time.
+ */
+static struct console pti_console = {
+        .name           = TTYNAME,
+        .write          = pti_console_write,
+        .device         = pti_console_device,
+        .setup          = pti_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = 0,
+};
+
+/**
+ * pti_port_activate()- Used to start/initialize any items upon
+ * first opening of tty_port().
+ *
+ * @port- The tty port number of the PTI device.
+ * @tty-  The tty struct associated with this device.
+ *
+ * Returns:
+ *      always returns 0
+ *
+ * Notes: The primary purpose of the PTI tty port 0 is to hook
+ * the syslog daemon to it; thus this port will be open for a
+ * very long time.
+ */
+static int pti_port_activate(struct tty_port *port, struct tty_struct *tty)
+{
+        if (port->tty->index == PTITTY_MINOR_START)
+                console_start(&pti_console);
+        return 0;
+}
+
+/**
+ * pti_port_shutdown()- Used to stop/shutdown any items upon the
+ * last tty port close.
+ *
+ * @port- The tty port number of the PTI device.
+ *
+ * Notes: The primary purpose of the PTI tty port 0 is to hook
+ * the syslog daemon to it; thus this port will be open for a
+ * very long time.
+ */
+static void pti_port_shutdown(struct tty_port *port)
+{
+        if (port->tty->index == PTITTY_MINOR_START)
+                console_stop(&pti_console);
+}
+
+static const struct tty_port_operations tty_port_ops = {
+        .activate = pti_port_activate,
+        .shutdown = pti_port_shutdown,
+};
+
+/*
+ * Note the _probe() call sets everything up and ties the char and tty
+ * to successfully detecting the PTI device on the pci bus.
+ */
+
+/**
+ * pti_pci_probe()- Used to detect pti on the pci bus and set
+ *                  things up in the driver.
+ *
+ * @pdev- pci_dev struct values for pti.
+ * @ent-  pci_device_id struct for pti driver.
+ *
+ * Returns:
+ *      0 for success
+ *      otherwise, error
+ */
+static int __devinit pti_pci_probe(struct pci_dev *pdev,
+                const struct pci_device_id *ent)
+{
+        int retval = -EINVAL;
+        int pci_bar = 1;
+
+        dev_dbg(&pdev->dev, "%s %s(%d): PTI PCI ID %04x:%04x\n", __FILE__,
+                        __func__, __LINE__, pdev->vendor, pdev->device);
+
+        retval = misc_register(&pti_char_driver);
+        if (retval) {
+                pr_err("%s(%d): CHAR registration failed of pti driver\n",
+                        __func__, __LINE__);
+                pr_err("%s(%d): Error value returned: %d\n",
+                        __func__, __LINE__, retval);
+                return retval;
+        }
+
+        retval = pci_enable_device(pdev);
+        if (retval != 0) {
+                dev_err(&pdev->dev,
+                        "%s: pci_enable_device() returned error %d\n",
+                        __func__, retval);
+                return retval;
+        }
+
+        drv_data = kzalloc(sizeof(*drv_data), GFP_KERNEL);
+
+        if (drv_data == NULL) {
+                retval = -ENOMEM;
+                dev_err(&pdev->dev,
+                        "%s(%d): kmalloc() returned NULL memory.\n",
+                        __func__, __LINE__);
+                return retval;
+        }
+        drv_data->pti_addr = pci_resource_start(pdev, pci_bar);
+
+        retval = pci_request_region(pdev, pci_bar, dev_name(&pdev->dev));
+        if (retval != 0) {
+                dev_err(&pdev->dev,
+                        "%s(%d): pci_request_region() returned error %d\n",
+                        __func__, __LINE__, retval);
+                kfree(drv_data);
+                return retval;
+        }
+        drv_data->aperture_base = drv_data->pti_addr+APERTURE_14;
+        drv_data->pti_ioaddr =
+                ioremap_nocache((u32)drv_data->aperture_base,
+                APERTURE_LEN);
+        if (!drv_data->pti_ioaddr) {
+                pci_release_region(pdev, pci_bar);
+                retval = -ENOMEM;
+                kfree(drv_data);
+                return retval;
+        }
+
+        pci_set_drvdata(pdev, drv_data);
+
+        tty_port_init(&drv_data->port);
+        drv_data->port.ops = &tty_port_ops;
+
+        tty_register_device(pti_tty_driver, 0, &pdev->dev);
+        tty_register_device(pti_tty_driver, 1, &pdev->dev);
+
+        register_console(&pti_console);
+
+        return retval;
+}
+
+static struct pci_driver pti_pci_driver = {
+        .name           = PCINAME,
+        .id_table       = pci_ids,
+        .probe          = pti_pci_probe,
+        .remove         = pti_pci_remove,
+};
+
+/**
+ *
+ * pti_init()- Overall entry/init call to the pti driver.
+ *             It starts the registration process with the kernel.
+ *
+ * Returns:
+ *      int __init, 0 for success
+ *      otherwise value is an error
+ *
+ */
+static int __init pti_init(void)
+{
+        int retval = -EINVAL;
+
+        /* First register module as tty device */
+
+        pti_tty_driver = alloc_tty_driver(1);
+        if (pti_tty_driver == NULL) {
+                pr_err("%s(%d): Memory allocation failed for ptiTTY driver\n",
+                        __func__, __LINE__);
+                return -ENOMEM;
+        }
+
+        pti_tty_driver->owner                   = THIS_MODULE;
+        pti_tty_driver->magic                   = TTY_DRIVER_MAGIC;
+        pti_tty_driver->driver_name             = DRIVERNAME;
+        pti_tty_driver->name                    = TTYNAME;
+        pti_tty_driver->major                   = 0;
+        pti_tty_driver->minor_start             = PTITTY_MINOR_START;
+        pti_tty_driver->minor_num               = PTITTY_MINOR_NUM;
+        pti_tty_driver->num                     = PTITTY_MINOR_NUM;
+        pti_tty_driver->type                    = TTY_DRIVER_TYPE_SYSTEM;
+        pti_tty_driver->subtype                 = SYSTEM_TYPE_SYSCONS;
+        pti_tty_driver->flags                   = TTY_DRIVER_REAL_RAW |
+                                                  TTY_DRIVER_DYNAMIC_DEV;
+        pti_tty_driver->init_termios            = tty_std_termios;
+
+        tty_set_operations(pti_tty_driver, &pti_tty_driver_ops);
+
+        retval = tty_register_driver(pti_tty_driver);
+        if (retval) {
+                pr_err("%s(%d): TTY registration failed of pti driver\n",
+                        __func__, __LINE__);
+                pr_err("%s(%d): Error value returned: %d\n",
+                        __func__, __LINE__, retval);
+
+                pti_tty_driver = NULL;
+                return retval;
+        }
+
+        retval = pci_register_driver(&pti_pci_driver);
+
+        if (retval) {
+                pr_err("%s(%d): PCI registration failed of pti driver\n",
+                        __func__, __LINE__);
+                pr_err("%s(%d): Error value returned: %d\n",
+                        __func__, __LINE__, retval);
+
+                tty_unregister_driver(pti_tty_driver);
+                pr_err("%s(%d): Unregistering TTY part of pti driver\n",
+                        __func__, __LINE__);
+                pti_tty_driver = NULL;
+                return retval;
+        }
+
+        return retval;
+}
+
+/**
+ * pti_exit()- Unregisters this module as a tty and pci driver.
+ */
+static void __exit pti_exit(void)
+{
+        int retval;
+
+        tty_unregister_device(pti_tty_driver, 0);
+        tty_unregister_device(pti_tty_driver, 1);
+
+        retval = tty_unregister_driver(pti_tty_driver);
+        if (retval) {
+                pr_err("%s(%d): TTY unregistration failed of pti driver\n",
+                        __func__, __LINE__);
+                pr_err("%s(%d): Error value returned: %d\n",
+                        __func__, __LINE__, retval);
+        }
+
+        pci_unregister_driver(&pti_pci_driver);
+
+        retval = misc_deregister(&pti_char_driver);
+        if (retval) {
+                pr_err("%s(%d): CHAR unregistration failed of pti driver\n",
+                        __func__, __LINE__);
+                pr_err("%s(%d): Error value returned: %d\n",
+                        __func__, __LINE__, retval);
+        }
+
+        unregister_console(&pti_console);
+        return;
+}
+
+module_init(pti_init);
+module_exit(pti_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ken Mills, Jay Freyensee");
+MODULE_DESCRIPTION("PTI Driver");
+
diff --git a/include/linux/pti.h b/include/linux/pti.h
new file mode 100644
index 000000000000..81af667bb2d5
--- /dev/null
+++ b/include/linux/pti.h
@@ -0,0 +1,42 @@
+/*
+ *  Copyright (C) Intel 2011
+ *
+ * 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.
+ *
+ * This header file will allow other parts of the OS to use the
+ * interface to write out it's contents for debugging a mobile system.
+ */
+
+#ifndef PTI_H_
+#define PTI_H_
+
+/* offset for last dword of any PTI message. Part of MIPI P1149.7 */
+#define PTI_LASTDWORD_DTS       0x30
+
+/* basic structure used as a write address to the PTI HW */
+struct pti_masterchannel {
+        u8 master;
+        u8 channel;
+};
+
+/* the following functions are defined in misc/pti.c */
+void pti_writedata(struct pti_masterchannel *mc, u8 *buf, int count);
+struct pti_masterchannel *pti_request_masterchannel(u8 type);
+void pti_release_masterchannel(struct pti_masterchannel *mc);
+
+#endif /*PTI_H_*/