drivers/net/wireless/intersil/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 #include <linux/ktime.h>
  23
  24 #include <linux/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  */
  44 void
  45 isl38xx_disable_interrupts(void __iomem *device)
  46 {
  47         isl38xx_w32_flush(device, 0x00000000, ISL38XX_INT_EN_REG);
  48         udelay(ISL38XX_WRITEIO_DELAY);
  49 }
  50
  51 void
  52 isl38xx_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
  87 void
  88 isl38xx_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
 110 void
 111 isl38xx_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 timespec64 current_ts64;
 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                 ktime_get_real_ts64(&current_ts64);
 126                 DEBUG(SHOW_TRACING, "%lld.%09ld Device wakeup triggered\n",
 127                       (s64)current_ts64.tv_sec, current_ts64.tv_nsec);
 128
 129                 DEBUG(SHOW_TRACING, "%lld.%09ld Device register read %08x\n",
 130                       (s64)current_ts64.tv_sec, current_ts64.tv_nsec,
 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                         ktime_get_real_ts64(&current_ts64);
 138                         DEBUG(SHOW_TRACING,
 139                               "%lld.%09ld Device register abadface\n",
 140                               (s64)current_ts64.tv_sec, current_ts64.tv_nsec);
 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                               "%lld.%09ld Device register read %08x\n",
 154                               (s64)current_ts64.tv_sec, current_ts64.tv_nsec,
 155                               readl(device_base + ISL38XX_CTRL_STAT_REG));
 156                         ktime_get_real_ts64(&current_ts64);
 157                         DEBUG(SHOW_TRACING,
 158                               "%lld.%09ld Device asleep counter %i\n",
 159                               (s64)current_ts64.tv_sec, current_ts64.tv_nsec,
 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                 ktime_get_real_ts64(&current_ts64);
 173                 DEBUG(SHOW_TRACING, "%lld.%00ld Device register read %08x\n",
 174                       (s64)current_ts64.tv_sec, current_ts64.tv_nsec, 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
 188 void
 189 isl38xx_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
 212 void
 213 isl38xx_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
 223 int
 224 isl38xx_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 }