256 lines
7.9 KiB
C
256 lines
7.9 KiB
C
/*
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* Copyright (C) 2002 Intersil Americas Inc.
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* Copyright (C) 2003-2004 Luis R. Rodriguez <mcgrof@ruslug.rutgers.edu>_
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include "prismcompat.h"
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#include "isl_38xx.h"
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#include "islpci_dev.h"
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#include "islpci_mgt.h"
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/******************************************************************************
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Device Interface & Control functions
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******************************************************************************/
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/**
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* isl38xx_disable_interrupts - disable all interrupts
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* @device: pci memory base address
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*
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* Instructs the device to disable all interrupt reporting by asserting
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* the IRQ line. New events may still show up in the interrupt identification
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* register located at offset %ISL38XX_INT_IDENT_REG.
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*/
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void
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isl38xx_disable_interrupts(void __iomem *device)
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{
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isl38xx_w32_flush(device, 0x00000000, ISL38XX_INT_EN_REG);
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udelay(ISL38XX_WRITEIO_DELAY);
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}
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void
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isl38xx_handle_sleep_request(isl38xx_control_block *control_block,
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int *powerstate, void __iomem *device_base)
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{
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/* device requests to go into sleep mode
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* check whether the transmit queues for data and management are empty */
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if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ))
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/* data tx queue not empty */
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return;
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if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ))
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/* management tx queue not empty */
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return;
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/* check also whether received frames are pending */
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if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_DATA_LQ))
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/* data rx queue not empty */
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return;
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if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_MGMTQ))
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/* management rx queue not empty */
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return;
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_TRACING, "Device going to sleep mode\n");
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#endif
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/* all queues are empty, allow the device to go into sleep mode */
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*powerstate = ISL38XX_PSM_POWERSAVE_STATE;
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/* assert the Sleep interrupt in the Device Interrupt Register */
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isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_SLEEP,
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ISL38XX_DEV_INT_REG);
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udelay(ISL38XX_WRITEIO_DELAY);
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}
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void
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isl38xx_handle_wakeup(isl38xx_control_block *control_block,
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int *powerstate, void __iomem *device_base)
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{
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/* device is in active state, update the powerstate flag */
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*powerstate = ISL38XX_PSM_ACTIVE_STATE;
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/* now check whether there are frames pending for the card */
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if (!isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ)
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&& !isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ))
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return;
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_ANYTHING, "Wake up handler trigger the device\n");
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#endif
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/* either data or management transmit queue has a frame pending
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* trigger the device by setting the Update bit in the Device Int reg */
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isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE,
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ISL38XX_DEV_INT_REG);
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udelay(ISL38XX_WRITEIO_DELAY);
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}
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void
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isl38xx_trigger_device(int asleep, void __iomem *device_base)
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{
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u32 reg;
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#if VERBOSE > SHOW_ERROR_MESSAGES
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u32 counter = 0;
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struct timeval current_time;
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DEBUG(SHOW_FUNCTION_CALLS, "isl38xx trigger device\n");
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#endif
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/* check whether the device is in power save mode */
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if (asleep) {
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/* device is in powersave, trigger the device for wakeup */
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#if VERBOSE > SHOW_ERROR_MESSAGES
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do_gettimeofday(¤t_time);
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DEBUG(SHOW_TRACING, "%08li.%08li Device wakeup triggered\n",
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current_time.tv_sec, (long)current_time.tv_usec);
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DEBUG(SHOW_TRACING, "%08li.%08li Device register read %08x\n",
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current_time.tv_sec, (long)current_time.tv_usec,
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readl(device_base + ISL38XX_CTRL_STAT_REG));
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#endif
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reg = readl(device_base + ISL38XX_INT_IDENT_REG);
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if (reg == 0xabadface) {
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#if VERBOSE > SHOW_ERROR_MESSAGES
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do_gettimeofday(¤t_time);
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DEBUG(SHOW_TRACING,
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"%08li.%08li Device register abadface\n",
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current_time.tv_sec, (long)current_time.tv_usec);
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#endif
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/* read the Device Status Register until Sleepmode bit is set */
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while (reg = readl(device_base + ISL38XX_CTRL_STAT_REG),
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(reg & ISL38XX_CTRL_STAT_SLEEPMODE) == 0) {
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udelay(ISL38XX_WRITEIO_DELAY);
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#if VERBOSE > SHOW_ERROR_MESSAGES
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counter++;
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#endif
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}
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_TRACING,
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"%08li.%08li Device register read %08x\n",
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current_time.tv_sec, (long)current_time.tv_usec,
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readl(device_base + ISL38XX_CTRL_STAT_REG));
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do_gettimeofday(¤t_time);
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DEBUG(SHOW_TRACING,
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"%08li.%08li Device asleep counter %i\n",
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current_time.tv_sec, (long)current_time.tv_usec,
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counter);
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#endif
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}
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/* assert the Wakeup interrupt in the Device Interrupt Register */
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isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_WAKEUP,
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ISL38XX_DEV_INT_REG);
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#if VERBOSE > SHOW_ERROR_MESSAGES
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udelay(ISL38XX_WRITEIO_DELAY);
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/* perform another read on the Device Status Register */
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reg = readl(device_base + ISL38XX_CTRL_STAT_REG);
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do_gettimeofday(¤t_time);
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DEBUG(SHOW_TRACING, "%08li.%08li Device register read %08x\n",
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current_time.tv_sec, (long)current_time.tv_usec, reg);
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#endif
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} else {
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/* device is (still) awake */
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_TRACING, "Device is in active state\n");
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#endif
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/* trigger the device by setting the Update bit in the Device Int reg */
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isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE,
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ISL38XX_DEV_INT_REG);
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}
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}
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void
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isl38xx_interface_reset(void __iomem *device_base, dma_addr_t host_address)
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{
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#if VERBOSE > SHOW_ERROR_MESSAGES
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DEBUG(SHOW_FUNCTION_CALLS, "isl38xx_interface_reset\n");
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#endif
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/* load the address of the control block in the device */
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isl38xx_w32_flush(device_base, host_address, ISL38XX_CTRL_BLK_BASE_REG);
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udelay(ISL38XX_WRITEIO_DELAY);
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/* set the reset bit in the Device Interrupt Register */
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isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_RESET, ISL38XX_DEV_INT_REG);
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udelay(ISL38XX_WRITEIO_DELAY);
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/* enable the interrupt for detecting initialization */
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/* Note: Do not enable other interrupts here. We want the
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* device to have come up first 100% before allowing any other
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* interrupts. */
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isl38xx_w32_flush(device_base, ISL38XX_INT_IDENT_INIT, ISL38XX_INT_EN_REG);
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udelay(ISL38XX_WRITEIO_DELAY); /* allow complete full reset */
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}
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void
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isl38xx_enable_common_interrupts(void __iomem *device_base)
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{
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u32 reg;
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reg = ISL38XX_INT_IDENT_UPDATE | ISL38XX_INT_IDENT_SLEEP |
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ISL38XX_INT_IDENT_WAKEUP;
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isl38xx_w32_flush(device_base, reg, ISL38XX_INT_EN_REG);
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udelay(ISL38XX_WRITEIO_DELAY);
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}
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int
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isl38xx_in_queue(isl38xx_control_block *cb, int queue)
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{
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const s32 delta = (le32_to_cpu(cb->driver_curr_frag[queue]) -
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le32_to_cpu(cb->device_curr_frag[queue]));
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/* determine the amount of fragments in the queue depending on the type
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* of the queue, either transmit or receive */
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BUG_ON(delta < 0); /* driver ptr must be ahead of device ptr */
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switch (queue) {
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/* send queues */
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case ISL38XX_CB_TX_MGMTQ:
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BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE);
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case ISL38XX_CB_TX_DATA_LQ:
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case ISL38XX_CB_TX_DATA_HQ:
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BUG_ON(delta > ISL38XX_CB_TX_QSIZE);
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return delta;
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/* receive queues */
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case ISL38XX_CB_RX_MGMTQ:
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BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE);
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return ISL38XX_CB_MGMT_QSIZE - delta;
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case ISL38XX_CB_RX_DATA_LQ:
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case ISL38XX_CB_RX_DATA_HQ:
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BUG_ON(delta > ISL38XX_CB_RX_QSIZE);
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return ISL38XX_CB_RX_QSIZE - delta;
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}
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BUG();
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return 0;
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}
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