LXR linux/drivers/net/wireless/prism54/isl

   1/*
   2 *  Copyright (C) 2002 Intersil Americas Inc.
   3 *  Copyright (C) 2003-2004 Luis R. Rodriguez <mcgrof@ruslug.rutgers.edu>_
   4 *
   5 *  This program is free software; you can redistribute it and/or modify
   6 *  it under the terms of the GNU General Public License as published by
   7 *  the Free Software Foundation; either version 2 of the License
   8 *
   9 *  This program is distributed in the hope that it will be useful,
  10 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 *  GNU General Public License for more details.
  13 *
  14 *  You should have received a copy of the GNU General Public License
  15 *  along with this program; if not, write to the Free Software
  16 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17 *
  18 */
  19
  20#include <linux/module.h>
  21#include <linux/types.h>
  22#include <linux/delay.h>
  23
  24#include <asm/uaccess.h>
  25#include <asm/io.h>
  26
  27#include "prismcompat.h"
  28#include "isl_38xx.h"
  29#include "islpci_dev.h"
  30#include "islpci_mgt.h"
  31
  32/******************************************************************************
  33    Device Interface & Control functions
  34******************************************************************************/
  35
  36/**
  37 * isl38xx_disable_interrupts - disable all interrupts
  38 * @device: pci memory base address
  39 *
  40 *  Instructs the device to disable all interrupt reporting by asserting
  41 *  the IRQ line. New events may still show up in the interrupt identification
  42 *  register located at offset %ISL38XX_INT_IDENT_REG.
  43 */
  44void
  45isl38xx_disable_interrupts(void __iomem *device)
  46{
  47        isl38xx_w32_flush(device, 0x00000000, ISL38XX_INT_EN_REG);
  48        udelay(ISL38XX_WRITEIO_DELAY);
  49}
  50
  51void
  52isl38xx_handle_sleep_request(isl38xx_control_block *control_block,
  53                             int *powerstate, void __iomem *device_base)
  54{
  55        /* device requests to go into sleep mode
  56         * check whether the transmit queues for data and management are empty */
  57        if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ))
  58                /* data tx queue not empty */
  59                return;
  60
  61        if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ))
  62                /* management tx queue not empty */
  63                return;
  64
  65        /* check also whether received frames are pending */
  66        if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_DATA_LQ))
  67                /* data rx queue not empty */
  68                return;
  69
  70        if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_MGMTQ))
  71                /* management rx queue not empty */
  72                return;
  73
  74#if VERBOSE > SHOW_ERROR_MESSAGES
  75        DEBUG(SHOW_TRACING, "Device going to sleep mode\n");
  76#endif
  77
  78        /* all queues are empty, allow the device to go into sleep mode */
  79        *powerstate = ISL38XX_PSM_POWERSAVE_STATE;
  80
  81        /* assert the Sleep interrupt in the Device Interrupt Register */
  82        isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_SLEEP,
  83                          ISL38XX_DEV_INT_REG);
  84        udelay(ISL38XX_WRITEIO_DELAY);
  85}
  86
  87void
  88isl38xx_handle_wakeup(isl38xx_control_block *control_block,
  89                      int *powerstate, void __iomem *device_base)
  90{
  91        /* device is in active state, update the powerstate flag */
  92        *powerstate = ISL38XX_PSM_ACTIVE_STATE;
  93
  94        /* now check whether there are frames pending for the card */
  95        if (!isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ)
  96            && !isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ))
  97                return;
  98
  99#if VERBOSE > SHOW_ERROR_MESSAGES
 100        DEBUG(SHOW_ANYTHING, "Wake up handler trigger the device\n");
 101#endif
 102
 103        /* either data or management transmit queue has a frame pending
 104         * trigger the device by setting the Update bit in the Device Int reg */
 105        isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE,
 106                          ISL38XX_DEV_INT_REG);
 107        udelay(ISL38XX_WRITEIO_DELAY);
 108}
 109
 110void
 111isl38xx_trigger_device(int asleep, void __iomem *device_base)
 112{
 113        u32 reg;
 114
 115#if VERBOSE > SHOW_ERROR_MESSAGES
 116        u32 counter = 0;
 117        struct timeval current_time;
 118        DEBUG(SHOW_FUNCTION_CALLS, "isl38xx trigger device\n");
 119#endif
 120
 121        /* check whether the device is in power save mode */
 122        if (asleep) {
 123                /* device is in powersave, trigger the device for wakeup */
 124#if VERBOSE > SHOW_ERROR_MESSAGES
 125                do_gettimeofday(&current_time);
 126                DEBUG(SHOW_TRACING, "%08li.%08li Device wakeup triggered\n",
 127                      current_time.tv_sec, (long)current_time.tv_usec);
 128
 129                DEBUG(SHOW_TRACING, "%08li.%08li Device register read %08x\n",
 130                      current_time.tv_sec, (long)current_time.tv_usec,
 131                      readl(device_base + ISL38XX_CTRL_STAT_REG));
 132#endif
 133
 134                reg = readl(device_base + ISL38XX_INT_IDENT_REG);
 135                if (reg == 0xabadface) {
 136#if VERBOSE > SHOW_ERROR_MESSAGES
 137                        do_gettimeofday(&current_time);
 138                        DEBUG(SHOW_TRACING,
 139                              "%08li.%08li Device register abadface\n",
 140                              current_time.tv_sec, (long)current_time.tv_usec);
 141#endif
 142                        /* read the Device Status Register until Sleepmode bit is set */
 143                        while (reg = readl(device_base + ISL38XX_CTRL_STAT_REG),
 144                               (reg & ISL38XX_CTRL_STAT_SLEEPMODE) == 0) {
 145                                udelay(ISL38XX_WRITEIO_DELAY);
 146#if VERBOSE > SHOW_ERROR_MESSAGES
 147                                counter++;
 148#endif
 149                        }
 150
 151#if VERBOSE > SHOW_ERROR_MESSAGES
 152                        DEBUG(SHOW_TRACING,
 153                              "%08li.%08li Device register read %08x\n",
 154                              current_time.tv_sec, (long)current_time.tv_usec,
 155                              readl(device_base + ISL38XX_CTRL_STAT_REG));
 156                        do_gettimeofday(&current_time);
 157                        DEBUG(SHOW_TRACING,
 158                              "%08li.%08li Device asleep counter %i\n",
 159                              current_time.tv_sec, (long)current_time.tv_usec,
 160                              counter);
 161#endif
 162                }
 163                /* assert the Wakeup interrupt in the Device Interrupt Register */
 164                isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_WAKEUP,
 165                                  ISL38XX_DEV_INT_REG);
 166
 167#if VERBOSE > SHOW_ERROR_MESSAGES
 168                udelay(ISL38XX_WRITEIO_DELAY);
 169
 170                /* perform another read on the Device Status Register */
 171                reg = readl(device_base + ISL38XX_CTRL_STAT_REG);
 172                do_gettimeofday(&current_time);
 173                DEBUG(SHOW_TRACING, "%08li.%08li Device register read %08x\n",
 174                      current_time.tv_sec, (long)current_time.tv_usec, reg);
 175#endif
 176        } else {
 177                /* device is (still) awake  */
 178#if VERBOSE > SHOW_ERROR_MESSAGES
 179                DEBUG(SHOW_TRACING, "Device is in active state\n");
 180#endif
 181                /* trigger the device by setting the Update bit in the Device Int reg */
 182
 183                isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE,
 184                                  ISL38XX_DEV_INT_REG);
 185        }
 186}
 187
 188void
 189isl38xx_interface_reset(void __iomem *device_base, dma_addr_t host_address)
 190{
 191#if VERBOSE > SHOW_ERROR_MESSAGES
 192        DEBUG(SHOW_FUNCTION_CALLS, "isl38xx_interface_reset\n");
 193#endif
 194
 195        /* load the address of the control block in the device */
 196        isl38xx_w32_flush(device_base, host_address, ISL38XX_CTRL_BLK_BASE_REG);
 197        udelay(ISL38XX_WRITEIO_DELAY);
 198
 199        /* set the reset bit in the Device Interrupt Register */
 200        isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_RESET, ISL38XX_DEV_INT_REG);
 201        udelay(ISL38XX_WRITEIO_DELAY);
 202
 203        /* enable the interrupt for detecting initialization */
 204
 205        /* Note: Do not enable other interrupts here. We want the
 206         * device to have come up first 100% before allowing any other
 207         * interrupts. */
 208        isl38xx_w32_flush(device_base, ISL38XX_INT_IDENT_INIT, ISL38XX_INT_EN_REG);
 209        udelay(ISL38XX_WRITEIO_DELAY);  /* allow complete full reset */
 210}
 211
 212void
 213isl38xx_enable_common_interrupts(void __iomem *device_base)
 214{
 215        u32 reg;
 216
 217        reg = ISL38XX_INT_IDENT_UPDATE | ISL38XX_INT_IDENT_SLEEP |
 218              ISL38XX_INT_IDENT_WAKEUP;
 219        isl38xx_w32_flush(device_base, reg, ISL38XX_INT_EN_REG);
 220        udelay(ISL38XX_WRITEIO_DELAY);
 221}
 222
 223int
 224isl38xx_in_queue(isl38xx_control_block *cb, int queue)
 225{
 226        const s32 delta = (le32_to_cpu(cb->driver_curr_frag[queue]) -
 227                           le32_to_cpu(cb->device_curr_frag[queue]));
 228
 229        /* determine the amount of fragments in the queue depending on the type
 230         * of the queue, either transmit or receive */
 231
 232        BUG_ON(delta < 0);      /* driver ptr must be ahead of device ptr */
 233
 234        switch (queue) {
 235                /* send queues */
 236        case ISL38XX_CB_TX_MGMTQ:
 237                BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE);
 238
 239        case ISL38XX_CB_TX_DATA_LQ:
 240        case ISL38XX_CB_TX_DATA_HQ:
 241                BUG_ON(delta > ISL38XX_CB_TX_QSIZE);
 242                return delta;
 243
 244                /* receive queues */
 245        case ISL38XX_CB_RX_MGMTQ:
 246                BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE);
 247                return ISL38XX_CB_MGMT_QSIZE - delta;
 248
 249        case ISL38XX_CB_RX_DATA_LQ:
 250        case ISL38XX_CB_RX_DATA_HQ:
 251                BUG_ON(delta > ISL38XX_CB_RX_QSIZE);
 252                return ISL38XX_CB_RX_QSIZE - delta;
 253        }
 254        BUG();
 255        return 0;
 256}
 257