drivers/net/wireless/prism54/isl_38xx.c

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