c24ec83bca
The interrupt line is disabled in op_stop using disable_irq. Since pending interrupts are synchronized, the mutex has to be released before disabling the interrupt to avoid a deadlock with the interrupt handler. In addition, the internal state of the driver is only set to 'off' after the interrupt is disabled. Otherwise, if an interrupt fires after the state is set but before the interrupt line is disabled, the interrupt handler will not be able to acknowledge the interrupt resulting in an interrupt storm. The driver's operations might be called during recovery. If these acquire the mutex after it was released by op_stop, but before the driver's state is changed, they may queue new work items instead of just failing. This is especially problematic in the case of scans, in which a new scan may be scheduled after all scan requests were cancelled. Signed-off-by: Ido Yariv <ido@wizery.com> Signed-off-by: Arik Nemtsov <arik@wizery.com>
200 lines
5.9 KiB
C
200 lines
5.9 KiB
C
/*
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* This file is part of wl1271
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*
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* Copyright (C) 2008-2010 Nokia Corporation
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*
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* Contact: Luciano Coelho <luciano.coelho@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/spi/spi.h>
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#include <linux/interrupt.h>
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#include "wlcore.h"
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#include "debug.h"
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#include "wl12xx_80211.h"
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#include "io.h"
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#include "tx.h"
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bool wl1271_set_block_size(struct wl1271 *wl)
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{
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if (wl->if_ops->set_block_size) {
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wl->if_ops->set_block_size(wl->dev, WL12XX_BUS_BLOCK_SIZE);
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return true;
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}
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return false;
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}
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void wlcore_disable_interrupts(struct wl1271 *wl)
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{
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disable_irq(wl->irq);
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}
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EXPORT_SYMBOL_GPL(wlcore_disable_interrupts);
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void wlcore_disable_interrupts_nosync(struct wl1271 *wl)
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{
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disable_irq_nosync(wl->irq);
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}
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EXPORT_SYMBOL_GPL(wlcore_disable_interrupts_nosync);
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void wlcore_enable_interrupts(struct wl1271 *wl)
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{
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enable_irq(wl->irq);
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}
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EXPORT_SYMBOL_GPL(wlcore_enable_interrupts);
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void wlcore_synchronize_interrupts(struct wl1271 *wl)
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{
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synchronize_irq(wl->irq);
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}
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EXPORT_SYMBOL_GPL(wlcore_synchronize_interrupts);
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int wlcore_translate_addr(struct wl1271 *wl, int addr)
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{
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struct wlcore_partition_set *part = &wl->curr_part;
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/*
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* To translate, first check to which window of addresses the
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* particular address belongs. Then subtract the starting address
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* of that window from the address. Then, add offset of the
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* translated region.
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*
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* The translated regions occur next to each other in physical device
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* memory, so just add the sizes of the preceding address regions to
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* get the offset to the new region.
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*/
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if ((addr >= part->mem.start) &&
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(addr < part->mem.start + part->mem.size))
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return addr - part->mem.start;
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else if ((addr >= part->reg.start) &&
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(addr < part->reg.start + part->reg.size))
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return addr - part->reg.start + part->mem.size;
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else if ((addr >= part->mem2.start) &&
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(addr < part->mem2.start + part->mem2.size))
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return addr - part->mem2.start + part->mem.size +
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part->reg.size;
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else if ((addr >= part->mem3.start) &&
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(addr < part->mem3.start + part->mem3.size))
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return addr - part->mem3.start + part->mem.size +
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part->reg.size + part->mem2.size;
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WARN(1, "HW address 0x%x out of range", addr);
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return 0;
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}
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EXPORT_SYMBOL_GPL(wlcore_translate_addr);
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/* Set the partitions to access the chip addresses
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*
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* To simplify driver code, a fixed (virtual) memory map is defined for
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* register and memory addresses. Because in the chipset, in different stages
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* of operation, those addresses will move around, an address translation
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* mechanism is required.
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*
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* There are four partitions (three memory and one register partition),
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* which are mapped to two different areas of the hardware memory.
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*
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* Virtual address
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* space
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*
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* | |
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* ...+----+--> mem.start
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* Physical address ... | |
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* space ... | | [PART_0]
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* ... | |
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* 00000000 <--+----+... ...+----+--> mem.start + mem.size
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* | | ... | |
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* |MEM | ... | |
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* | | ... | |
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* mem.size <--+----+... | | {unused area)
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* | | ... | |
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* |REG | ... | |
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* mem.size | | ... | |
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* + <--+----+... ...+----+--> reg.start
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* reg.size | | ... | |
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* |MEM2| ... | | [PART_1]
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* | | ... | |
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* ...+----+--> reg.start + reg.size
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* | |
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*
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*/
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int wlcore_set_partition(struct wl1271 *wl,
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const struct wlcore_partition_set *p)
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{
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int ret;
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/* copy partition info */
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memcpy(&wl->curr_part, p, sizeof(*p));
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wl1271_debug(DEBUG_IO, "mem_start %08X mem_size %08X",
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p->mem.start, p->mem.size);
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wl1271_debug(DEBUG_IO, "reg_start %08X reg_size %08X",
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p->reg.start, p->reg.size);
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wl1271_debug(DEBUG_IO, "mem2_start %08X mem2_size %08X",
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p->mem2.start, p->mem2.size);
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wl1271_debug(DEBUG_IO, "mem3_start %08X mem3_size %08X",
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p->mem3.start, p->mem3.size);
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ret = wlcore_raw_write32(wl, HW_PART0_START_ADDR, p->mem.start);
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if (ret < 0)
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goto out;
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ret = wlcore_raw_write32(wl, HW_PART0_SIZE_ADDR, p->mem.size);
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if (ret < 0)
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goto out;
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ret = wlcore_raw_write32(wl, HW_PART1_START_ADDR, p->reg.start);
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if (ret < 0)
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goto out;
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ret = wlcore_raw_write32(wl, HW_PART1_SIZE_ADDR, p->reg.size);
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if (ret < 0)
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goto out;
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ret = wlcore_raw_write32(wl, HW_PART2_START_ADDR, p->mem2.start);
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if (ret < 0)
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goto out;
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ret = wlcore_raw_write32(wl, HW_PART2_SIZE_ADDR, p->mem2.size);
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if (ret < 0)
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goto out;
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/*
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* We don't need the size of the last partition, as it is
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* automatically calculated based on the total memory size and
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* the sizes of the previous partitions.
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*/
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ret = wlcore_raw_write32(wl, HW_PART3_START_ADDR, p->mem3.start);
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out:
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return ret;
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}
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EXPORT_SYMBOL_GPL(wlcore_set_partition);
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void wl1271_io_reset(struct wl1271 *wl)
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{
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if (wl->if_ops->reset)
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wl->if_ops->reset(wl->dev);
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}
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void wl1271_io_init(struct wl1271 *wl)
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{
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if (wl->if_ops->init)
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wl->if_ops->init(wl->dev);
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}
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