drivers/net/wireless/prism54/isl_38xx.c

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