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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  Copyright (C) 2002 Intersil Americas Inc.
   4 *  Copyright (C) 2003-2004 Luis R. Rodriguez <mcgrof@ruslug.rutgers.edu>_
   5 */
   6
   7#include <linux/module.h>
   8#include <linux/types.h>
   9#include <linux/delay.h>
  10#include <linux/ktime.h>
  11
  12#include <linux/uaccess.h>
  13#include <asm/io.h>
  14
  15#include "prismcompat.h"
  16#include "isl_38xx.h"
  17#include "islpci_dev.h"
  18#include "islpci_mgt.h"
  19
  20/******************************************************************************
  21    Device Interface & Control functions
  22******************************************************************************/
  23
  24/**
  25 * isl38xx_disable_interrupts - disable all interrupts
  26 * @device: pci memory base address
  27 *
  28 *  Instructs the device to disable all interrupt reporting by asserting
  29 *  the IRQ line. New events may still show up in the interrupt identification
  30 *  register located at offset %ISL38XX_INT_IDENT_REG.
  31 */
  32void
  33isl38xx_disable_interrupts(void __iomem *device)
  34{
  35        isl38xx_w32_flush(device, 0x00000000, ISL38XX_INT_EN_REG);
  36        udelay(ISL38XX_WRITEIO_DELAY);
  37}
  38
  39void
  40isl38xx_handle_sleep_request(isl38xx_control_block *control_block,
  41                             int *powerstate, void __iomem *device_base)
  42{
  43        /* device requests to go into sleep mode
  44         * check whether the transmit queues for data and management are empty */
  45        if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ))
  46                /* data tx queue not empty */
  47                return;
  48
  49        if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ))
  50                /* management tx queue not empty */
  51                return;
  52
  53        /* check also whether received frames are pending */
  54        if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_DATA_LQ))
  55                /* data rx queue not empty */
  56                return;
  57
  58        if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_MGMTQ))
  59                /* management rx queue not empty */
  60                return;
  61
  62#if VERBOSE > SHOW_ERROR_MESSAGES
  63        DEBUG(SHOW_TRACING, "Device going to sleep mode\n");
  64#endif
  65
  66        /* all queues are empty, allow the device to go into sleep mode */
  67        *powerstate = ISL38XX_PSM_POWERSAVE_STATE;
  68
  69        /* assert the Sleep interrupt in the Device Interrupt Register */
  70        isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_SLEEP,
  71                          ISL38XX_DEV_INT_REG);
  72        udelay(ISL38XX_WRITEIO_DELAY);
  73}
  74
  75void
  76isl38xx_handle_wakeup(isl38xx_control_block *control_block,
  77                      int *powerstate, void __iomem *device_base)
  78{
  79        /* device is in active state, update the powerstate flag */
  80        *powerstate = ISL38XX_PSM_ACTIVE_STATE;
  81
  82        /* now check whether there are frames pending for the card */
  83        if (!isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ)
  84            && !isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ))
  85                return;
  86
  87#if VERBOSE > SHOW_ERROR_MESSAGES
  88        DEBUG(SHOW_ANYTHING, "Wake up handler trigger the device\n");
  89#endif
  90
  91        /* either data or management transmit queue has a frame pending
  92         * trigger the device by setting the Update bit in the Device Int reg */
  93        isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE,
  94                          ISL38XX_DEV_INT_REG);
  95        udelay(ISL38XX_WRITEIO_DELAY);
  96}
  97
  98void
  99isl38xx_trigger_device(int asleep, void __iomem *device_base)
 100{
 101        u32 reg;
 102
 103#if VERBOSE > SHOW_ERROR_MESSAGES
 104        u32 counter = 0;
 105        struct timespec64 current_ts64;
 106        DEBUG(SHOW_FUNCTION_CALLS, "isl38xx trigger device\n");
 107#endif
 108
 109        /* check whether the device is in power save mode */
 110        if (asleep) {
 111                /* device is in powersave, trigger the device for wakeup */
 112#if VERBOSE > SHOW_ERROR_MESSAGES
 113                ktime_get_real_ts64(&current_ts64);
 114                DEBUG(SHOW_TRACING, "%lld.%09ld Device wakeup triggered\n",
 115                      (s64)current_ts64.tv_sec, current_ts64.tv_nsec);
 116
 117                DEBUG(SHOW_TRACING, "%lld.%09ld Device register read %08x\n",
 118                      (s64)current_ts64.tv_sec, current_ts64.tv_nsec,
 119                      readl(device_base + ISL38XX_CTRL_STAT_REG));
 120#endif
 121
 122                reg = readl(device_base + ISL38XX_INT_IDENT_REG);
 123                if (reg == 0xabadface) {
 124#if VERBOSE > SHOW_ERROR_MESSAGES
 125                        ktime_get_real_ts64(&current_ts64);
 126                        DEBUG(SHOW_TRACING,
 127                              "%lld.%09ld Device register abadface\n",
 128                              (s64)current_ts64.tv_sec, current_ts64.tv_nsec);
 129#endif
 130                        /* read the Device Status Register until Sleepmode bit is set */
 131                        while (reg = readl(device_base + ISL38XX_CTRL_STAT_REG),
 132                               (reg & ISL38XX_CTRL_STAT_SLEEPMODE) == 0) {
 133                                udelay(ISL38XX_WRITEIO_DELAY);
 134#if VERBOSE > SHOW_ERROR_MESSAGES
 135                                counter++;
 136#endif
 137                        }
 138
 139#if VERBOSE > SHOW_ERROR_MESSAGES
 140                        DEBUG(SHOW_TRACING,
 141                              "%lld.%09ld Device register read %08x\n",
 142                              (s64)current_ts64.tv_sec, current_ts64.tv_nsec,
 143                              readl(device_base + ISL38XX_CTRL_STAT_REG));
 144                        ktime_get_real_ts64(&current_ts64);
 145                        DEBUG(SHOW_TRACING,
 146                              "%lld.%09ld Device asleep counter %i\n",
 147                              (s64)current_ts64.tv_sec, current_ts64.tv_nsec,
 148                              counter);
 149#endif
 150                }
 151                /* assert the Wakeup interrupt in the Device Interrupt Register */
 152                isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_WAKEUP,
 153                                  ISL38XX_DEV_INT_REG);
 154
 155#if VERBOSE > SHOW_ERROR_MESSAGES
 156                udelay(ISL38XX_WRITEIO_DELAY);
 157
 158                /* perform another read on the Device Status Register */
 159                reg = readl(device_base + ISL38XX_CTRL_STAT_REG);
 160                ktime_get_real_ts64(&current_ts64);
 161                DEBUG(SHOW_TRACING, "%lld.%00ld Device register read %08x\n",
 162                      (s64)current_ts64.tv_sec, current_ts64.tv_nsec, reg);
 163#endif
 164        } else {
 165                /* device is (still) awake  */
 166#if VERBOSE > SHOW_ERROR_MESSAGES
 167                DEBUG(SHOW_TRACING, "Device is in active state\n");
 168#endif
 169                /* trigger the device by setting the Update bit in the Device Int reg */
 170
 171                isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE,
 172                                  ISL38XX_DEV_INT_REG);
 173        }
 174}
 175
 176void
 177isl38xx_interface_reset(void __iomem *device_base, dma_addr_t host_address)
 178{
 179#if VERBOSE > SHOW_ERROR_MESSAGES
 180        DEBUG(SHOW_FUNCTION_CALLS, "isl38xx_interface_reset\n");
 181#endif
 182
 183        /* load the address of the control block in the device */
 184        isl38xx_w32_flush(device_base, host_address, ISL38XX_CTRL_BLK_BASE_REG);
 185        udelay(ISL38XX_WRITEIO_DELAY);
 186
 187        /* set the reset bit in the Device Interrupt Register */
 188        isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_RESET, ISL38XX_DEV_INT_REG);
 189        udelay(ISL38XX_WRITEIO_DELAY);
 190
 191        /* enable the interrupt for detecting initialization */
 192
 193        /* Note: Do not enable other interrupts here. We want the
 194         * device to have come up first 100% before allowing any other
 195         * interrupts. */
 196        isl38xx_w32_flush(device_base, ISL38XX_INT_IDENT_INIT, ISL38XX_INT_EN_REG);
 197        udelay(ISL38XX_WRITEIO_DELAY);  /* allow complete full reset */
 198}
 199
 200void
 201isl38xx_enable_common_interrupts(void __iomem *device_base)
 202{
 203        u32 reg;
 204
 205        reg = ISL38XX_INT_IDENT_UPDATE | ISL38XX_INT_IDENT_SLEEP |
 206              ISL38XX_INT_IDENT_WAKEUP;
 207        isl38xx_w32_flush(device_base, reg, ISL38XX_INT_EN_REG);
 208        udelay(ISL38XX_WRITEIO_DELAY);
 209}
 210
 211int
 212isl38xx_in_queue(isl38xx_control_block *cb, int queue)
 213{
 214        const s32 delta = (le32_to_cpu(cb->driver_curr_frag[queue]) -
 215                           le32_to_cpu(cb->device_curr_frag[queue]));
 216
 217        /* determine the amount of fragments in the queue depending on the type
 218         * of the queue, either transmit or receive */
 219
 220        BUG_ON(delta < 0);      /* driver ptr must be ahead of device ptr */
 221
 222        switch (queue) {
 223                /* send queues */
 224        case ISL38XX_CB_TX_MGMTQ:
 225                BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE);
 226                fallthrough;
 227
 228        case ISL38XX_CB_TX_DATA_LQ:
 229        case ISL38XX_CB_TX_DATA_HQ:
 230                BUG_ON(delta > ISL38XX_CB_TX_QSIZE);
 231                return delta;
 232
 233                /* receive queues */
 234        case ISL38XX_CB_RX_MGMTQ:
 235                BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE);
 236                return ISL38XX_CB_MGMT_QSIZE - delta;
 237
 238        case ISL38XX_CB_RX_DATA_LQ:
 239        case ISL38XX_CB_RX_DATA_HQ:
 240                BUG_ON(delta > ISL38XX_CB_RX_QSIZE);
 241                return ISL38XX_CB_RX_QSIZE - delta;
 242        }
 243        BUG();
 244        return 0;
 245}
 246