drivers/staging/et131x/et1310_pm.c

   1 /*
   2  * Agere Systems Inc.
   3  * 10/100/1000 Base-T Ethernet Driver for the ET1301 and ET131x series MACs
   4  *
   5  * Copyright © 2005 Agere Systems Inc.
   6  * All rights reserved.
   7  *   http://www.agere.com
   8  *
   9  * Copyright (c) 2011 Mark Einon <mark.einon@gmail.com>
  10  *
  11  *------------------------------------------------------------------------------
  12  *
  13  * et1310_pm.c - All power management related code (not completely implemented)
  14  *
  15  *------------------------------------------------------------------------------
  16  *
  17  * SOFTWARE LICENSE
  18  *
  19  * This software is provided subject to the following terms and conditions,
  20  * which you should read carefully before using the software.  Using this
  21  * software indicates your acceptance of these terms and conditions.  If you do
  22  * not agree with these terms and conditions, do not use the software.
  23  *
  24  * Copyright © 2005 Agere Systems Inc.
  25  * All rights reserved.
  26  *
  27  * Redistribution and use in source or binary forms, with or without
  28  * modifications, are permitted provided that the following conditions are met:
  29  *
  30  * . Redistributions of source code must retain the above copyright notice, this
  31  *    list of conditions and the following Disclaimer as comments in the code as
  32  *    well as in the documentation and/or other materials provided with the
  33  *    distribution.
  34  *
  35  * . Redistributions in binary form must reproduce the above copyright notice,
  36  *    this list of conditions and the following Disclaimer in the documentation
  37  *    and/or other materials provided with the distribution.
  38  *
  39  * . Neither the name of Agere Systems Inc. nor the names of the contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * Disclaimer
  44  *
  45  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  46  * INCLUDING, BUT NOT LIMITED TO, INFRINGEMENT AND THE IMPLIED WARRANTIES OF
  47  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  ANY
  48  * USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE IS SOLELY AT THE USERS OWN
  49  * RISK. IN NO EVENT SHALL AGERE SYSTEMS INC. OR CONTRIBUTORS BE LIABLE FOR ANY
  50  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  51  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  52  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  53  * ON ANY THEORY OF LIABILITY, INCLUDING, BUT NOT LIMITED TO, CONTRACT, STRICT
  54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  55  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  56  * DAMAGE.
  57  *
  58  */
  59
  60 #include "et131x_defs.h"
  61
  62 #include <linux/init.h>
  63 #include <linux/module.h>
  64 #include <linux/types.h>
  65 #include <linux/kernel.h>
  66
  67 #include <linux/sched.h>
  68 #include <linux/ptrace.h>
  69 #include <linux/ctype.h>
  70 #include <linux/string.h>
  71 #include <linux/timer.h>
  72 #include <linux/interrupt.h>
  73 #include <linux/in.h>
  74 #include <linux/delay.h>
  75 #include <linux/io.h>
  76 #include <linux/bitops.h>
  77 #include <asm/system.h>
  78
  79 #include <linux/netdevice.h>
  80 #include <linux/etherdevice.h>
  81 #include <linux/skbuff.h>
  82 #include <linux/if_arp.h>
  83 #include <linux/ioport.h>
  84
  85 #include "et1310_phy.h"
  86 #include "et1310_rx.h"
  87 #include "et131x_adapter.h"
  88 #include "et131x.h"
  89
  90 /**
  91  * et1310_in_phy_coma - check if the device is in phy coma
  92  * @adapter: pointer to our adapter structure
  93  *
  94  * Returns 0 if the device is not in phy coma, 1 if it is in phy coma
  95  */
  96 int et1310_in_phy_coma(struct et131x_adapter *adapter)
  97 {
  98         u32 pmcsr;
  99
 100         pmcsr = readl(&adapter->regs->global.pm_csr);
 101
 102         return ET_PM_PHY_SW_COMA & pmcsr ? 1 : 0;
 103 }
 104
 105 /**
 106  * et1310_enable_phy_coma - called when network cable is unplugged
 107  * @adapter: pointer to our adapter structure
 108  *
 109  * driver receive an phy status change interrupt while in D0 and check that
 110  * phy_status is down.
 111  *
 112  *          -- gate off JAGCore;
 113  *          -- set gigE PHY in Coma mode
 114  *          -- wake on phy_interrupt; Perform software reset JAGCore,
 115  *             re-initialize jagcore and gigE PHY
 116  *
 117  *      Add D0-ASPM-PhyLinkDown Support:
 118  *          -- while in D0, when there is a phy_interrupt indicating phy link
 119  *             down status, call the MPSetPhyComa routine to enter this active
 120  *             state power saving mode
 121  *          -- while in D0-ASPM-PhyLinkDown mode, when there is a phy_interrupt
 122  *       indicating linkup status, call the MPDisablePhyComa routine to
 123  *             restore JAGCore and gigE PHY
 124  */
 125 void et1310_enable_phy_coma(struct et131x_adapter *adapter)
 126 {
 127         unsigned long flags;
 128         u32 pmcsr;
 129
 130         pmcsr = readl(&adapter->regs->global.pm_csr);
 131
 132         /* Save the GbE PHY speed and duplex modes. Need to restore this
 133          * when cable is plugged back in
 134          */
 135         /*
 136          * TODO - when PM is re-enabled, check if we need to
 137          * perform a similar task as this -
 138          * adapter->pdown_speed = adapter->ai_force_speed;
 139          * adapter->pdown_duplex = adapter->ai_force_duplex;
 140          */
 141
 142         /* Stop sending packets. */
 143         spin_lock_irqsave(&adapter->send_hw_lock, flags);
 144         adapter->flags |= fMP_ADAPTER_LOWER_POWER;
 145         spin_unlock_irqrestore(&adapter->send_hw_lock, flags);
 146
 147         /* Wait for outstanding Receive packets */
 148
 149         et131x_disable_txrx(adapter->netdev);
 150
 151         /* Gate off JAGCore 3 clock domains */
 152         pmcsr &= ~ET_PMCSR_INIT;
 153         writel(pmcsr, &adapter->regs->global.pm_csr);
 154
 155         /* Program gigE PHY in to Coma mode */
 156         pmcsr |= ET_PM_PHY_SW_COMA;
 157         writel(pmcsr, &adapter->regs->global.pm_csr);
 158 }
 159
 160 /**
 161  * et1310_disable_phy_coma - Disable the Phy Coma Mode
 162  * @adapter: pointer to our adapter structure
 163  */
 164 void et1310_disable_phy_coma(struct et131x_adapter *adapter)
 165 {
 166         u32 pmcsr;
 167
 168         pmcsr = readl(&adapter->regs->global.pm_csr);
 169
 170         /* Disable phy_sw_coma register and re-enable JAGCore clocks */
 171         pmcsr |= ET_PMCSR_INIT;
 172         pmcsr &= ~ET_PM_PHY_SW_COMA;
 173         writel(pmcsr, &adapter->regs->global.pm_csr);
 174
 175         /* Restore the GbE PHY speed and duplex modes;
 176          * Reset JAGCore; re-configure and initialize JAGCore and gigE PHY
 177          */
 178         /* TODO - when PM is re-enabled, check if we need to
 179          * perform a similar task as this -
 180          * adapter->ai_force_speed = adapter->pdown_speed;
 181          * adapter->ai_force_duplex = adapter->pdown_duplex;
 182          */
 183
 184         /* Re-initialize the send structures */
 185         et131x_init_send(adapter);
 186
 187         /* Reset the RFD list and re-start RU  */
 188         et131x_reset_recv(adapter);
 189
 190         /* Bring the device back to the state it was during init prior to
 191          * autonegotiation being complete.  This way, when we get the auto-neg
 192          * complete interrupt, we can complete init by calling ConfigMacREGS2.
 193          */
 194         et131x_soft_reset(adapter);
 195
 196         /* setup et1310 as per the documentation ?? */
 197         et131x_adapter_setup(adapter);
 198
 199         /* Allow Tx to restart */
 200         adapter->flags &= ~fMP_ADAPTER_LOWER_POWER;
 201
 202         et131x_enable_txrx(adapter->netdev);
 203 }
 204