tracehook_notify_death: use task_detached() helper

[linux-2.6/mini2440.git] / drivers / staging / et131x / et131x_initpci.c

/*
 * Agere Systems Inc.
 * 10/100/1000 Base-T Ethernet Driver for the ET1301 and ET131x series MACs
 *
 * Copyright © 2005 Agere Systems Inc.
 * All rights reserved.
 *   http://www.agere.com
 *
 *------------------------------------------------------------------------------
 *
 * et131x_initpci.c - Routines and data used to register the driver with the
 *                    PCI (and PCI Express) subsystem, as well as basic driver
 *                    init and startup.
 *
 *------------------------------------------------------------------------------
 *
 * SOFTWARE LICENSE
 *
 * This software is provided subject to the following terms and conditions,
 * which you should read carefully before using the software.  Using this
 * software indicates your acceptance of these terms and conditions.  If you do
 * not agree with these terms and conditions, do not use the software.
 *
 * Copyright © 2005 Agere Systems Inc.
 * All rights reserved.
 *
 * Redistribution and use in source or binary forms, with or without
 * modifications, are permitted provided that the following conditions are met:
 *
 * . Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following Disclaimer as comments in the code as
 *    well as in the documentation and/or other materials provided with the
 *    distribution.
 *
 * . Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following Disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * . Neither the name of Agere Systems Inc. nor the names of the contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * Disclaimer
 *
 * THIS SOFTWARE IS PROVIDED “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, INFRINGEMENT AND THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  ANY
 * USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE IS SOLELY AT THE USERS OWN
 * RISK. IN NO EVENT SHALL AGERE SYSTEMS INC. OR CONTRIBUTORS 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, INCLUDING, BUT NOT LIMITED TO, 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.
 *
 */

#include "et131x_version.h"
#include "et131x_debug.h"
#include "et131x_defs.h"

#include <linux/pci.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>

#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/in.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/bitops.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/ioport.h>
#include <linux/random.h>

#include "et1310_phy.h"
#include "et1310_pm.h"
#include "et1310_jagcore.h"

#include "et131x_adapter.h"
#include "et131x_netdev.h"
#include "et131x_config.h"
#include "et131x_isr.h"

#include "et1310_address_map.h"
#include "et1310_tx.h"
#include "et1310_rx.h"
#include "et1310_mac.h"
#include "et1310_eeprom.h"


int __devinit et131x_pci_setup(struct pci_dev *pdev,
                               const struct pci_device_id *ent);
void __devexit et131x_pci_remove(struct pci_dev *pdev);


/* Modinfo parameters (filled out using defines from et131x_version.h) */
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_INFO);
MODULE_LICENSE(DRIVER_LICENSE);

/* Module Parameters and related data for debugging facilities */
#ifdef CONFIG_ET131X_DEBUG
static u32 et131x_debug_level = DBG_LVL;
static u32 et131x_debug_flags = DBG_DEFAULTS;

/*
et131x_debug_level :
 Level of debugging desired (0-7)
   7 : DBG_RX_ON | DBG_TX_ON
   6 : DBG_PARAM_ON
   5 : DBG_VERBOSE_ON
   4 : DBG_TRACE_ON
   3 : DBG_NOTICE_ON
   2 : no debug info
   1 : no debug info
   0 : no debug info
*/

module_param(et131x_debug_level, uint, 0);
module_param(et131x_debug_flags, uint, 0);

MODULE_PARM_DESC(et131x_debug_level, "Level of debugging desired (0-7)");

static dbg_info_t et131x_info = { DRIVER_NAME_EXT, 0, 0 };
dbg_info_t *et131x_dbginfo = &et131x_info;
#endif /* CONFIG_ET131X_DEBUG */

static struct pci_device_id et131x_pci_table[] __devinitdata = {
        {ET131X_PCI_VENDOR_ID, ET131X_PCI_DEVICE_ID_GIG, PCI_ANY_ID,
         PCI_ANY_ID, 0, 0, 0UL},
        {ET131X_PCI_VENDOR_ID, ET131X_PCI_DEVICE_ID_FAST, PCI_ANY_ID,
         PCI_ANY_ID, 0, 0, 0UL},
        {0,}
};

MODULE_DEVICE_TABLE(pci, et131x_pci_table);

static struct pci_driver et131x_driver = {
      .name     = DRIVER_NAME,
      .id_table = et131x_pci_table,
      .probe    = et131x_pci_setup,
      .remove   = __devexit_p(et131x_pci_remove),
      .suspend  = NULL,         //et131x_pci_suspend,
      .resume   = NULL,         //et131x_pci_resume,
};


/**
 * et131x_init_module - The "main" entry point called on driver initialization
 *
 * Returns 0 on success, errno on failure (as defined in errno.h)
 */
int et131x_init_module(void)
{
        int result;

#ifdef CONFIG_ET131X_DEBUG
        /* Set the level of debug messages displayed using the module
         * parameter
         */
        et131x_dbginfo->dbgFlags = et131x_debug_flags;

        switch (et131x_debug_level) {
        case 7:
                et131x_dbginfo->dbgFlags |= (DBG_RX_ON | DBG_TX_ON);

        case 6:
                et131x_dbginfo->dbgFlags |= DBG_PARAM_ON;

        case 5:
                et131x_dbginfo->dbgFlags |= DBG_VERBOSE_ON;

        case 4:
                et131x_dbginfo->dbgFlags |= DBG_TRACE_ON;

        case 3:
                et131x_dbginfo->dbgFlags |= DBG_NOTICE_ON;

        case 2:
        case 1:
        case 0:
        default:
                break;
        }
#endif /* CONFIG_ET131X_DEBUG */

        DBG_ENTER(et131x_dbginfo);
        DBG_PRINT("%s\n", DRIVER_INFO);

        result = pci_register_driver(&et131x_driver);

        DBG_LEAVE(et131x_dbginfo);
        return result;
}

/**
 * et131x_cleanup_module - The entry point called on driver cleanup
 */
void et131x_cleanup_module(void)
{
        DBG_ENTER(et131x_dbginfo);

        pci_unregister_driver(&et131x_driver);

        DBG_LEAVE(et131x_dbginfo);
}

/*
 * These macros map the driver-specific init_module() and cleanup_module()
 * routines so they can be called by the kernel.
 */
module_init(et131x_init_module);
module_exit(et131x_cleanup_module);


/**
 * et131x_find_adapter - Find the adapter and get all the assigned resources
 * @adapter: pointer to our private adapter structure
 *
 * Returns 0 on success, errno on failure (as defined in errno.h)
 */
int et131x_find_adapter(struct et131x_adapter *adapter, struct pci_dev *pdev)
{
        int result;
        uint8_t eepromStat;
        uint8_t maxPayload = 0;
        uint8_t read_size_reg;

        DBG_ENTER(et131x_dbginfo);

        /* Allow disabling of Non-Maskable Interrupts in I/O space, to
         * support validation.
         */
        if (adapter->RegistryNMIDisable) {
                uint8_t RegisterVal;

                RegisterVal = inb(ET1310_NMI_DISABLE);
                RegisterVal &= 0xf3;

                if (adapter->RegistryNMIDisable == 2) {
                        RegisterVal |= 0xc;
                }

                outb(ET1310_NMI_DISABLE, RegisterVal);
        }

        /* We first need to check the EEPROM Status code located at offset
         * 0xB2 of config space
         */
        result = pci_read_config_byte(pdev, ET1310_PCI_EEPROM_STATUS,
                                      &eepromStat);

        /* THIS IS A WORKAROUND:
         * I need to call this function twice to get my card in a
         * LG M1 Express Dual running. I tried also a msleep before this
         * function, because I thougth there could be some time condidions
         * but it didn't work. Call the whole function twice also work.
         */
        result = pci_read_config_byte(pdev, ET1310_PCI_EEPROM_STATUS,
                                      &eepromStat);
        if (result != PCIBIOS_SUCCESSFUL) {
                DBG_ERROR(et131x_dbginfo, "Could not read PCI config space for "
                          "EEPROM Status\n");
                DBG_LEAVE(et131x_dbginfo);
                return -EIO;
        }

        /* Determine if the error(s) we care about are present.  If they are
         * present, we need to fail.
         */
        if (eepromStat & 0x4C) {
                result = pci_read_config_byte(pdev, PCI_REVISION_ID,
                                              &adapter->RevisionID);
                if (result != PCIBIOS_SUCCESSFUL) {
                        DBG_ERROR(et131x_dbginfo,
                                  "Could not read PCI config space for "
                                  "Revision ID\n");
                        DBG_LEAVE(et131x_dbginfo);
                        return -EIO;
                } else if (adapter->RevisionID == 0x01) {
                        int32_t nLoop;
                        uint8_t ucTemp[4] = { 0xFE, 0x13, 0x10, 0xFF };

                        /* Re-write the first 4 bytes if we have an eeprom
                         * present and the revision id is 1, this fixes the
                         * corruption seen with 1310 B Silicon
                         */
                        for (nLoop = 0; nLoop < 3; nLoop++) {
                                EepromWriteByte(adapter, nLoop, ucTemp[nLoop],
                                                0, SINGLE_BYTE);
                        }
                }

                DBG_ERROR(et131x_dbginfo,
                          "Fatal EEPROM Status Error - 0x%04x\n", eepromStat);

                /* This error could mean that there was an error reading the
                 * eeprom or that the eeprom doesn't exist.  We will treat
                 * each case the same and not try to gather additional
                 * information that normally would come from the eeprom, like
                 * MAC Address
                 */
                adapter->bEepromPresent = false;

                DBG_LEAVE(et131x_dbginfo);
                return -EIO;
        } else {
                DBG_TRACE(et131x_dbginfo, "EEPROM Status Code - 0x%04x\n",
                          eepromStat);
                adapter->bEepromPresent = true;
        }

        /* Read the EEPROM for information regarding LED behavior. Refer to
         * ET1310_phy.c, et131x_xcvr_init(), for its use.
         */
        EepromReadByte(adapter, 0x70, &adapter->eepromData[0], 0, SINGLE_BYTE);
        EepromReadByte(adapter, 0x71, &adapter->eepromData[1], 0, SINGLE_BYTE);

        if (adapter->eepromData[0] != 0xcd) {
                adapter->eepromData[1] = 0x00;  // Disable all optional features
        }

        /* Let's set up the PORT LOGIC Register.  First we need to know what
         * the max_payload_size is
         */
        result = pci_read_config_byte(pdev, ET1310_PCI_MAX_PYLD, &maxPayload);
        if (result != PCIBIOS_SUCCESSFUL) {
                DBG_ERROR(et131x_dbginfo, "Could not read PCI config space for "
                          "Max Payload Size\n");
                DBG_LEAVE(et131x_dbginfo);
                return -EIO;
        }

        /* Program the Ack/Nak latency and replay timers */
        maxPayload &= 0x07;     // Only the lower 3 bits are valid

        if (maxPayload < 2) {
                const uint16_t AckNak[2] = { 0x76, 0xD0 };
                const uint16_t Replay[2] = { 0x1E0, 0x2ED };

                result = pci_write_config_word(pdev, ET1310_PCI_ACK_NACK,
                                               AckNak[maxPayload]);
                if (result != PCIBIOS_SUCCESSFUL) {
                        DBG_ERROR(et131x_dbginfo,
                                  "Could not write PCI config space "
                                  "for ACK/NAK\n");
                        DBG_LEAVE(et131x_dbginfo);
                        return -EIO;
                }

                result = pci_write_config_word(pdev, ET1310_PCI_REPLAY,
                                               Replay[maxPayload]);
                if (result != PCIBIOS_SUCCESSFUL) {
                        DBG_ERROR(et131x_dbginfo,
                                  "Could not write PCI config space "
                                  "for Replay Timer\n");
                        DBG_LEAVE(et131x_dbginfo);
                        return -EIO;
                }
        }

        /* l0s and l1 latency timers.  We are using default values.
         * Representing 001 for L0s and 010 for L1
         */
        result = pci_write_config_byte(pdev, ET1310_PCI_L0L1LATENCY, 0x11);
        if (result != PCIBIOS_SUCCESSFUL) {
                DBG_ERROR(et131x_dbginfo,
                          "Could not write PCI config space for "
                          "Latency Timers\n");
                DBG_LEAVE(et131x_dbginfo);
                return -EIO;
        }

        /* Change the max read size to 2k */
        result = pci_read_config_byte(pdev, 0x51, &read_size_reg);
        if (result != PCIBIOS_SUCCESSFUL) {
                DBG_ERROR(et131x_dbginfo,
                          "Could not read PCI config space for Max read size\n");
                DBG_LEAVE(et131x_dbginfo);
                return -EIO;
        }

        read_size_reg &= 0x8f;
        read_size_reg |= 0x40;

        result = pci_write_config_byte(pdev, 0x51, read_size_reg);
        if (result != PCIBIOS_SUCCESSFUL) {
                DBG_ERROR(et131x_dbginfo,
                          "Could not write PCI config space for Max read size\n");
                DBG_LEAVE(et131x_dbginfo);
                return -EIO;
        }

        /* PCI Express Configuration registers 0x48-0x5B (Device Control) */
        result = pci_read_config_word(pdev, ET1310_PCI_DEV_CTRL,
                                      &adapter->PciXDevCtl);
        if (result != PCIBIOS_SUCCESSFUL) {
                DBG_ERROR(et131x_dbginfo,
                          "Could not read PCI config space for PCI Express Dev Ctl\n");
                DBG_LEAVE(et131x_dbginfo);
                return -EIO;
        }

        /* Get MAC address from config space if an eeprom exists, otherwise
         * the MAC address there will not be valid
         */
        if (adapter->bEepromPresent) {
                int i;

                for (i = 0; i < ETH_ALEN; i++) {
                        result = pci_read_config_byte(
                                        pdev, ET1310_PCI_MAC_ADDRESS + i,
                                        adapter->PermanentAddress + i);
                        if (result != PCIBIOS_SUCCESSFUL) {
                                DBG_ERROR(et131x_dbginfo,
                                          "Could not read PCI config space for MAC address\n");
                                DBG_LEAVE(et131x_dbginfo);
                                return -EIO;
                        }
                }
        }

        DBG_LEAVE(et131x_dbginfo);
        return 0;
}

/**
 * et131x_error_timer_handler
 * @data: timer-specific variable; here a pointer to our adapter structure
 *
 * The routine called when the error timer expires, to track the number of
 * recurring errors.
 */
void et131x_error_timer_handler(unsigned long data)
{
        struct et131x_adapter *pAdapter = (struct et131x_adapter *) data;
        PM_CSR_t pm_csr;

        pm_csr.value = readl(&pAdapter->CSRAddress->global.pm_csr.value);

        if (pm_csr.bits.pm_phy_sw_coma == 0) {
                if (pAdapter->RegistryMACStat) {
                        UpdateMacStatHostCounters(pAdapter);
                }
        } else {
                DBG_VERBOSE(et131x_dbginfo,
                            "No interrupts, in PHY coma, pm_csr = 0x%x\n",
                            pm_csr.value);
        }

        if (!pAdapter->Bmsr.bits.link_status &&
            pAdapter->RegistryPhyComa &&
            pAdapter->PoMgmt.TransPhyComaModeOnBoot < 11) {
                pAdapter->PoMgmt.TransPhyComaModeOnBoot++;
        }

        if (pAdapter->PoMgmt.TransPhyComaModeOnBoot == 10) {
                if (!pAdapter->Bmsr.bits.link_status
                    && pAdapter->RegistryPhyComa) {
                        if (pm_csr.bits.pm_phy_sw_coma == 0) {
                                // NOTE - This was originally a 'sync with interrupt'. How
                                //        to do that under Linux?
                                et131x_enable_interrupts(pAdapter);
                                EnablePhyComa(pAdapter);
                        }
                }
        }

        /* This is a periodic timer, so reschedule */
        mod_timer(&pAdapter->ErrorTimer, jiffies +
                  TX_ERROR_PERIOD * HZ / 1000);
}

/**
 * et131x_link_detection_handler
 *
 * Timer function for link up at driver load time
 */
void et131x_link_detection_handler(unsigned long data)
{
        struct et131x_adapter *pAdapter = (struct et131x_adapter *) data;
        unsigned long lockflags;

        /* Let everyone know that we have run */
        pAdapter->bLinkTimerActive = false;

        if (pAdapter->MediaState == 0) {
                spin_lock_irqsave(&pAdapter->Lock, lockflags);

                pAdapter->MediaState = NETIF_STATUS_MEDIA_DISCONNECT;
                MP_CLEAR_FLAG(pAdapter, fMP_ADAPTER_LINK_DETECTION);

                spin_unlock_irqrestore(&pAdapter->Lock, lockflags);

                netif_carrier_off(pAdapter->netdev);

                pAdapter->bSetPending = false;
        }
}

/**
 * et131x_adapter_setup - Set the adapter up as per cassini+ documentation
 * @adapter: pointer to our private adapter structure
 *
 * Returns 0 on success, errno on failure (as defined in errno.h)
 */
int et131x_adapter_setup(struct et131x_adapter *pAdapter)
{
        int status = 0;

        DBG_ENTER(et131x_dbginfo);

        /* Configure the JAGCore */
        ConfigGlobalRegs(pAdapter);

        ConfigMACRegs1(pAdapter);
        ConfigMMCRegs(pAdapter);

        ConfigRxMacRegs(pAdapter);
        ConfigTxMacRegs(pAdapter);

        ConfigRxDmaRegs(pAdapter);
        ConfigTxDmaRegs(pAdapter);

        ConfigMacStatRegs(pAdapter);

        /* Move the following code to Timer function?? */
        status = et131x_xcvr_find(pAdapter);

        if (status != 0) {
                DBG_WARNING(et131x_dbginfo, "Could not find the xcvr\n");
        }

        /* Prepare the TRUEPHY library. */
        ET1310_PhyInit(pAdapter);

        /* Reset the phy now so changes take place */
        ET1310_PhyReset(pAdapter);

        /* Power down PHY */
        ET1310_PhyPowerDown(pAdapter, 1);

        /*
         * We need to turn off 1000 base half dulplex, the mac does not
         * support it. For the 10/100 part, turn off all gig advertisement
         */
        if (pAdapter->DeviceID != ET131X_PCI_DEVICE_ID_FAST) {
                ET1310_PhyAdvertise1000BaseT(pAdapter, TRUEPHY_ADV_DUPLEX_FULL);
        } else {
                ET1310_PhyAdvertise1000BaseT(pAdapter, TRUEPHY_ADV_DUPLEX_NONE);
        }

        /* Power up PHY */
        ET1310_PhyPowerDown(pAdapter, 0);

        et131x_setphy_normal(pAdapter);

        DBG_LEAVE(et131x_dbginfo);
        return status;
}

/**
 * et131x_setup_hardware_properties - set up the MAC Address on the ET1310
 * @adapter: pointer to our private adapter structure
 */
void et131x_setup_hardware_properties(struct et131x_adapter *adapter)
{
        DBG_ENTER(et131x_dbginfo);

        /* If have our default mac from registry and no mac address from
         * EEPROM then we need to generate the last octet and set it on the
         * device
         */
        if (!adapter->bOverrideAddress) {
                if (adapter->PermanentAddress[0] == 0x00 &&
                    adapter->PermanentAddress[1] == 0x00 &&
                    adapter->PermanentAddress[2] == 0x00 &&
                    adapter->PermanentAddress[3] == 0x00 &&
                    adapter->PermanentAddress[4] == 0x00 &&
                    adapter->PermanentAddress[5] == 0x00) {
                        /*
                         * We need to randomly generate the last octet so we
                         * decrease our chances of setting the mac address to
                         * same as another one of our cards in the system
                         */
                        get_random_bytes(&adapter->CurrentAddress[5], 1);

                        /*
                         * We have the default value in the register we are
                         * working with so we need to copy the current
                         * address into the permanent address
                         */
                        memcpy(adapter->PermanentAddress,
                               adapter->CurrentAddress, ETH_ALEN);
                } else {
                        /* We do not have an override address, so set the
                         * current address to the permanent address and add
                         * it to the device
                         */
                        memcpy(adapter->CurrentAddress,
                               adapter->PermanentAddress, ETH_ALEN);
                }
        }

        DBG_LEAVE(et131x_dbginfo);
}

/**
 * et131x_soft_reset - Issue a soft reset to the hardware, complete for ET1310
 * @adapter: pointer to our private adapter structure
 */
void et131x_soft_reset(struct et131x_adapter *adapter)
{
        DBG_ENTER(et131x_dbginfo);

        /* Disable MAC Core */
        writel(0xc00f0000, &adapter->CSRAddress->mac.cfg1.value);

        /* Set everything to a reset value */
        writel(0x7F, &adapter->CSRAddress->global.sw_reset.value);
        writel(0x000f0000, &adapter->CSRAddress->mac.cfg1.value);
        writel(0x00000000, &adapter->CSRAddress->mac.cfg1.value);

        DBG_LEAVE(et131x_dbginfo);
}

/**
 * et131x_align_allocated_memory - Align allocated memory on a given boundary
 * @adapter: pointer to our adapter structure
 * @phys_addr: pointer to Physical address
 * @offset: pointer to the offset variable
 * @mask: correct mask
 */
void et131x_align_allocated_memory(struct et131x_adapter *adapter,
                                   uint64_t *phys_addr,
                                   uint64_t *offset, uint64_t mask)
{
        uint64_t new_addr;

        DBG_ENTER(et131x_dbginfo);

        *offset = 0;

        new_addr = *phys_addr & ~mask;

        if (new_addr != *phys_addr) {
                /* Move to next aligned block */
                new_addr += mask + 1;
                /* Return offset for adjusting virt addr */
                *offset = new_addr - *phys_addr;
                /* Return new physical address */
                *phys_addr = new_addr;
        }

        DBG_LEAVE(et131x_dbginfo);
}

/**
 * et131x_adapter_memory_alloc
 * @adapter: pointer to our private adapter structure
 *
 * Returns 0 on success, errno on failure (as defined in errno.h).
 *
 * Allocate all the memory blocks for send, receive and others.
 */
int et131x_adapter_memory_alloc(struct et131x_adapter *adapter)
{
        int status = 0;

        DBG_ENTER(et131x_dbginfo);

        do {
                /* Allocate memory for the Tx Ring */
                status = et131x_tx_dma_memory_alloc(adapter);
                if (status != 0) {
                        DBG_ERROR(et131x_dbginfo,
                                  "et131x_tx_dma_memory_alloc FAILED\n");
                        break;
                }

                /* Receive buffer memory allocation */
                status = et131x_rx_dma_memory_alloc(adapter);
                if (status != 0) {
                        DBG_ERROR(et131x_dbginfo,
                                  "et131x_rx_dma_memory_alloc FAILED\n");
                        et131x_tx_dma_memory_free(adapter);
                        break;
                }

                /* Init receive data structures */
                status = et131x_init_recv(adapter);
                if (status != 0) {
                        DBG_ERROR(et131x_dbginfo, "et131x_init_recv FAILED\n");
                        et131x_tx_dma_memory_free(adapter);
                        et131x_rx_dma_memory_free(adapter);
                        break;
                }
        } while (0);

        DBG_LEAVE(et131x_dbginfo);
        return status;
}

/**
 * et131x_adapter_memory_free - Free all memory allocated for use by Tx & Rx
 * @adapter: pointer to our private adapter structure
 */
void et131x_adapter_memory_free(struct et131x_adapter *adapter)
{
        DBG_ENTER(et131x_dbginfo);

        /* Free DMA memory */
        et131x_tx_dma_memory_free(adapter);
        et131x_rx_dma_memory_free(adapter);

        DBG_LEAVE(et131x_dbginfo);
}

/**
 * et131x_pci_remove
 * @pdev: a pointer to the device's pci_dev structure
 *
 * Registered in the pci_driver structure, this function is called when the
 * PCI subsystem detects that a PCI device which matches the information
 * contained in the pci_device_id table has been removed.
 */
void __devexit et131x_pci_remove(struct pci_dev *pdev)
{
        struct net_device *netdev;
        struct et131x_adapter *adapter;

        DBG_ENTER(et131x_dbginfo);

        /* Retrieve the net_device pointer from the pci_dev struct, as well
         * as the private adapter struct
         */
        netdev = (struct net_device *) pci_get_drvdata(pdev);
        adapter = netdev_priv(netdev);

        /* Perform device cleanup */
        unregister_netdev(netdev);
        et131x_adapter_memory_free(adapter);
        iounmap(adapter->CSRAddress);
        free_netdev(netdev);
        pci_release_regions(pdev);
        pci_disable_device(pdev);

        DBG_LEAVE(et131x_dbginfo);
}

/**
 * et131x_pci_setup - Perform device initialization
 * @pdev: a pointer to the device's pci_dev structure
 * @ent: this device's entry in the pci_device_id table
 *
 * Returns 0 on success, errno on failure (as defined in errno.h)
 *
 * Registered in the pci_driver structure, this function is called when the
 * PCI subsystem finds a new PCI device which matches the information
 * contained in the pci_device_id table. This routine is the equivalent to
 * a device insertion routine.
 */
int __devinit et131x_pci_setup(struct pci_dev *pdev,
                               const struct pci_device_id *ent)
{
        int result = 0;
        int pm_cap;
        bool pci_using_dac;
        struct net_device *netdev = NULL;
        struct et131x_adapter *adapter = NULL;

        DBG_ENTER(et131x_dbginfo);

        /* Enable the device via the PCI subsystem */
        result = pci_enable_device(pdev);
        if (result != 0) {
                DBG_ERROR(et131x_dbginfo, "pci_enable_device() failed\n");
                goto out;
        }

        /* Perform some basic PCI checks */
        if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
                DBG_ERROR(et131x_dbginfo,
                          "Can't find PCI device's base address\n");
                result = -ENODEV;
                goto out;
        }

        result = pci_request_regions(pdev, DRIVER_NAME);
        if (result != 0) {
                DBG_ERROR(et131x_dbginfo, "Can't get PCI resources\n");
                goto err_disable;
        }

        /* Enable PCI bus mastering */
        DBG_TRACE(et131x_dbginfo, "Setting PCI Bus Mastering...\n");
        pci_set_master(pdev);

        /* Query PCI for Power Mgmt Capabilities
         *
         * NOTE: Now reading PowerMgmt in another location; is this still
         * needed?
         */
        pm_cap = pci_find_capability(pdev, PCI_CAP_ID_PM);
        if (pm_cap == 0) {
                DBG_ERROR(et131x_dbginfo,
                          "Cannot find Power Management capabilities\n");
                result = -EIO;
                goto err_release_res;
        }

        /* Check the DMA addressing support of this device */
        if (!pci_set_dma_mask(pdev, 0xffffffffffffffffULL)) {
                DBG_TRACE(et131x_dbginfo, "64-bit DMA addressing supported\n");
                pci_using_dac = true;

                result =
                    pci_set_consistent_dma_mask(pdev, 0xffffffffffffffffULL);
                if (result != 0) {
                        DBG_ERROR(et131x_dbginfo,
                                  "Unable to obtain 64 bit DMA for consistent allocations\n");
                        goto err_release_res;
                }
        } else if (!pci_set_dma_mask(pdev, 0xffffffffULL)) {
                DBG_TRACE(et131x_dbginfo,
                          "64-bit DMA addressing NOT supported\n");
                DBG_TRACE(et131x_dbginfo,
                          "32-bit DMA addressing will be used\n");
                pci_using_dac = false;
        } else {
                DBG_ERROR(et131x_dbginfo, "No usable DMA addressing method\n");
                result = -EIO;
                goto err_release_res;
        }

        /* Allocate netdev and private adapter structs */
        DBG_TRACE(et131x_dbginfo,
                  "Allocate netdev and private adapter structs...\n");
        netdev = et131x_device_alloc();
        if (netdev == NULL) {
                DBG_ERROR(et131x_dbginfo, "Couldn't alloc netdev struct\n");
                result = -ENOMEM;
                goto err_release_res;
        }

        /* Setup the fundamental net_device and private adapter structure elements  */
        DBG_TRACE(et131x_dbginfo, "Setting fundamental net_device info...\n");
        SET_NETDEV_DEV(netdev, &pdev->dev);
        if (pci_using_dac) {
                //netdev->features |= NETIF_F_HIGHDMA;
        }

        /*
         * NOTE - Turn this on when we're ready to deal with SG-DMA
         *
         * NOTE: According to "Linux Device Drivers", 3rd ed, Rubini et al,
         * if checksumming is not performed in HW, then the kernel will not
         * use SG.
         * From pp 510-511:
         *
         * "Note that the kernel does not perform scatter/gather I/O to your
         * device if it does not also provide some form of checksumming as
         * well. The reason is that, if the kernel has to make a pass over a
         * fragmented ("nonlinear") packet to calculate the checksum, it
         * might as well copy the data and coalesce the packet at the same
         * time."
         *
         * This has been verified by setting the flags below and still not
         * receiving a scattered buffer from the network stack, so leave it
         * off until checksums are calculated in HW.
         */
        //netdev->features |= NETIF_F_SG;
        //netdev->features |= NETIF_F_NO_CSUM;
        //netdev->features |= NETIF_F_LLTX;

        /* Allocate private adapter struct and copy in relevant information */
        adapter = netdev_priv(netdev);
        adapter->pdev = pdev;
        adapter->netdev = netdev;
        adapter->VendorID = pdev->vendor;
        adapter->DeviceID = pdev->device;

        /* Do the same for the netdev struct */
        netdev->irq = pdev->irq;
        netdev->base_addr = pdev->resource[0].start;

        /* Initialize spinlocks here */
        DBG_TRACE(et131x_dbginfo, "Initialize spinlocks...\n");

        spin_lock_init(&adapter->Lock);
        spin_lock_init(&adapter->TCBSendQLock);
        spin_lock_init(&adapter->TCBReadyQLock);
        spin_lock_init(&adapter->SendHWLock);
        spin_lock_init(&adapter->SendWaitLock);
        spin_lock_init(&adapter->RcvLock);
        spin_lock_init(&adapter->RcvPendLock);
        spin_lock_init(&adapter->FbrLock);
        spin_lock_init(&adapter->PHYLock);

        /* Parse configuration parameters into the private adapter struct */
        et131x_config_parse(adapter);

        /* Find the physical adapter
         *
         * NOTE: This is the equivalent of the MpFindAdapter() routine; can we
         *       lump it's init with the device specific init below into a
         *       single init function?
         */
        //while (et131x_find_adapter(adapter, pdev) != 0);
        et131x_find_adapter(adapter, pdev);

        /* Map the bus-relative registers to system virtual memory */
        DBG_TRACE(et131x_dbginfo,
                  "Mapping bus-relative registers to virtual memory...\n");

        adapter->CSRAddress = ioremap_nocache(pci_resource_start(pdev, 0),
                                              pci_resource_len(pdev, 0));
        if (adapter->CSRAddress == NULL) {
                DBG_ERROR(et131x_dbginfo, "Cannot map device registers\n");
                result = -ENOMEM;
                goto err_free_dev;
        }

        /* Perform device-specific initialization here (See code below) */

        /* If Phy COMA mode was enabled when we went down, disable it here. */
        {
                PM_CSR_t GlobalPmCSR = { 0 };

                GlobalPmCSR.bits.pm_sysclk_gate = 1;
                GlobalPmCSR.bits.pm_txclk_gate = 1;
                GlobalPmCSR.bits.pm_rxclk_gate = 1;
                writel(GlobalPmCSR.value,
                       &adapter->CSRAddress->global.pm_csr.value);
        }

        /* Issue a global reset to the et1310 */
        DBG_TRACE(et131x_dbginfo, "Issuing soft reset...\n");
        et131x_soft_reset(adapter);

        /* Disable all interrupts (paranoid) */
        DBG_TRACE(et131x_dbginfo, "Disable device interrupts...\n");
        et131x_disable_interrupts(adapter);

        /* Allocate DMA memory */
        result = et131x_adapter_memory_alloc(adapter);
        if (result != 0) {
                DBG_ERROR(et131x_dbginfo,
                          "Could not alloc adapater memory (DMA)\n");
                goto err_iounmap;
        }

        /* Init send data structures */
        DBG_TRACE(et131x_dbginfo, "Init send data structures...\n");
        et131x_init_send(adapter);

        adapter->PoMgmt.PowerState = NdisDeviceStateD0;

        /* Register the interrupt
         *
         * NOTE - This is being done in the open routine, where most other
         *         Linux drivers setup IRQ handlers. Make sure device
         *         interrupts are not turned on before the IRQ is registered!!
         *
         *         What we will do here is setup the task structure for the
         *         ISR's deferred handler
         */
        INIT_WORK(&adapter->task, et131x_isr_handler);

        /* Determine MAC Address, and copy into the net_device struct */
        DBG_TRACE(et131x_dbginfo, "Retrieve MAC address...\n");
        et131x_setup_hardware_properties(adapter);

        memcpy(netdev->dev_addr, adapter->CurrentAddress, ETH_ALEN);

        /* Setup et1310 as per the documentation */
        DBG_TRACE(et131x_dbginfo, "Setup the adapter...\n");
        et131x_adapter_setup(adapter);

        /* Create a timer to count errors received by the NIC */
        init_timer(&adapter->ErrorTimer);

        adapter->ErrorTimer.expires = jiffies + TX_ERROR_PERIOD * HZ / 1000;
        adapter->ErrorTimer.function = et131x_error_timer_handler;
        adapter->ErrorTimer.data = (unsigned long)adapter;

        /* Initialize link state */
        et131x_link_detection_handler((unsigned long)adapter);

        /* Intialize variable for counting how long we do not have link status */
        adapter->PoMgmt.TransPhyComaModeOnBoot = 0;

        /* We can enable interrupts now
         *
         *  NOTE - Because registration of interrupt handler is done in the
         *         device's open(), defer enabling device interrupts to that
         *         point
         */

        /* Register the net_device struct with the Linux network layer */
        DBG_TRACE(et131x_dbginfo, "Registering net_device...\n");
        if ((result = register_netdev(netdev)) != 0) {
                DBG_ERROR(et131x_dbginfo, "register_netdev() failed\n");
                goto err_mem_free;
        }

        /* Register the net_device struct with the PCI subsystem. Save a copy
         * of the PCI config space for this device now that the device has
         * been initialized, just in case it needs to be quickly restored.
         */
        pci_set_drvdata(pdev, netdev);

        pci_save_state(adapter->pdev);

out:
        DBG_LEAVE(et131x_dbginfo);
        return result;

err_mem_free:
        et131x_adapter_memory_free(adapter);
err_iounmap:
        iounmap(adapter->CSRAddress);
err_free_dev:
        free_netdev(netdev);
err_release_res:
        pci_release_regions(pdev);
err_disable:
        pci_disable_device(pdev);
        goto out;
}