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  *------------------------------------------------------------------------------
  10  *
  11  * et1310_pm.c - All power management related code (not completely implemented)
  12  *
  13  *------------------------------------------------------------------------------
  14  *
  15  * SOFTWARE LICENSE
  16  *
  17  * This software is provided subject to the following terms and conditions,
  18  * which you should read carefully before using the software.  Using this
  19  * software indicates your acceptance of these terms and conditions.  If you do
  20  * not agree with these terms and conditions, do not use the software.
  21  *
  22  * Copyright © 2005 Agere Systems Inc.
  23  * All rights reserved.
  24  *
  25  * Redistribution and use in source or binary forms, with or without
  26  * modifications, are permitted provided that the following conditions are met:
  27  *
  28  * . Redistributions of source code must retain the above copyright notice, this
  29  *    list of conditions and the following Disclaimer as comments in the code as
  30  *    well as in the documentation and/or other materials provided with the
  31  *    distribution.
  32  *
  33  * . Redistributions in binary form must reproduce the above copyright notice,
  34  *    this list of conditions and the following Disclaimer in the documentation
  35  *    and/or other materials provided with the distribution.
  36  *
  37  * . Neither the name of Agere Systems Inc. nor the names of the contributors
  38  *    may be used to endorse or promote products derived from this software
  39  *    without specific prior written permission.
  40  *
  41  * Disclaimer
  42  *
  43  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  44  * INCLUDING, BUT NOT LIMITED TO, INFRINGEMENT AND THE IMPLIED WARRANTIES OF
  45  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  ANY
  46  * USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE IS SOLELY AT THE USERS OWN
  47  * RISK. IN NO EVENT SHALL AGERE SYSTEMS INC. OR CONTRIBUTORS BE LIABLE FOR ANY
  48  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  49  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  50  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  51  * ON ANY THEORY OF LIABILITY, INCLUDING, BUT NOT LIMITED TO, CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  53  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  54  * DAMAGE.
  55  *
  56  */
  57
  58 #include "et131x_version.h"
  59 #include "et131x_defs.h"
  60
  61 #include <linux/init.h>
  62 #include <linux/module.h>
  63 #include <linux/types.h>
  64 #include <linux/kernel.h>
  65
  66 #include <linux/sched.h>
  67 #include <linux/ptrace.h>
  68 #include <linux/ctype.h>
  69 #include <linux/string.h>
  70 #include <linux/timer.h>
  71 #include <linux/interrupt.h>
  72 #include <linux/in.h>
  73 #include <linux/delay.h>
  74 #include <linux/io.h>
  75 #include <linux/bitops.h>
  76 #include <asm/system.h>
  77
  78 #include <linux/netdevice.h>
  79 #include <linux/etherdevice.h>
  80 #include <linux/skbuff.h>
  81 #include <linux/if_arp.h>
  82 #include <linux/ioport.h>
  83
  84 #include "et1310_phy.h"
  85 #include "et1310_rx.h"
  86 #include "et131x_adapter.h"
  87 #include "et131x.h"
  88
  89 /**
  90  * et1310_enable_phy_coma - called when network cable is unplugged
  91  * @adapter: pointer to our adapter structure
  92  *
  93  * driver receive an phy status change interrupt while in D0 and check that
  94  * phy_status is down.
  95  *
  96  *          -- gate off JAGCore;
  97  *          -- set gigE PHY in Coma mode
  98  *          -- wake on phy_interrupt; Perform software reset JAGCore,
  99  *             re-initialize jagcore and gigE PHY
 100  *
 101  *      Add D0-ASPM-PhyLinkDown Support:
 102  *          -- while in D0, when there is a phy_interrupt indicating phy link
 103  *             down status, call the MPSetPhyComa routine to enter this active
 104  *             state power saving mode
 105  *          -- while in D0-ASPM-PhyLinkDown mode, when there is a phy_interrupt
 106  *       indicating linkup status, call the MPDisablePhyComa routine to
 107  *             restore JAGCore and gigE PHY
 108  */
 109 void et1310_enable_phy_coma(struct et131x_adapter *adapter)
 110 {
 111         unsigned long flags;
 112         u32 pmcsr;
 113
 114         pmcsr = readl(&adapter->regs->global.pm_csr);
 115
 116         /* Save the GbE PHY speed and duplex modes. Need to restore this
 117          * when cable is plugged back in
 118          */
 119         /*
 120          * TODO - when PM is re-enabled, check if we need to
 121          * perform a similar task as this -
 122          * adapter->pdown_speed = adapter->ai_force_speed;
 123          * adapter->pdown_duplex = adapter->ai_force_duplex;
 124          */
 125
 126         /* Stop sending packets. */
 127         spin_lock_irqsave(&adapter->send_hw_lock, flags);
 128         adapter->flags |= fMP_ADAPTER_LOWER_POWER;
 129         spin_unlock_irqrestore(&adapter->send_hw_lock, flags);
 130
 131         /* Wait for outstanding Receive packets */
 132
 133         /* Gate off JAGCore 3 clock domains */
 134         pmcsr &= ~ET_PMCSR_INIT;
 135         writel(pmcsr, &adapter->regs->global.pm_csr);
 136
 137         /* Program gigE PHY in to Coma mode */
 138         pmcsr |= ET_PM_PHY_SW_COMA;
 139         writel(pmcsr, &adapter->regs->global.pm_csr);
 140 }
 141
 142 /**
 143  * et1310_disable_phy_coma - Disable the Phy Coma Mode
 144  * @adapter: pointer to our adapter structure
 145  */
 146 void et1310_disable_phy_coma(struct et131x_adapter *adapter)
 147 {
 148         u32 pmcsr;
 149
 150         pmcsr = readl(&adapter->regs->global.pm_csr);
 151
 152         /* Disable phy_sw_coma register and re-enable JAGCore clocks */
 153         pmcsr |= ET_PMCSR_INIT;
 154         pmcsr &= ~ET_PM_PHY_SW_COMA;
 155         writel(pmcsr, &adapter->regs->global.pm_csr);
 156
 157         /* Restore the GbE PHY speed and duplex modes;
 158          * Reset JAGCore; re-configure and initialize JAGCore and gigE PHY
 159          */
 160         /* TODO - when PM is re-enabled, check if we need to
 161          * perform a similar task as this -
 162          * adapter->ai_force_speed = adapter->pdown_speed;
 163          * adapter->ai_force_duplex = adapter->pdown_duplex;
 164          */
 165
 166         /* Re-initialize the send structures */
 167         et131x_init_send(adapter);
 168
 169         /* Reset the RFD list and re-start RU  */
 170         et131x_reset_recv(adapter);
 171
 172         /* Bring the device back to the state it was during init prior to
 173          * autonegotiation being complete.  This way, when we get the auto-neg
 174          * complete interrupt, we can complete init by calling ConfigMacREGS2.
 175          */
 176         et131x_soft_reset(adapter);
 177
 178         /* setup et1310 as per the documentation ?? */
 179         et131x_adapter_setup(adapter);
 180
 181         /* Allow Tx to restart */
 182         adapter->flags &= ~fMP_ADAPTER_LOWER_POWER;
 183
 184         /* Need to re-enable Rx. */
 185         et131x_rx_dma_enable(adapter);
 186 }
 187