![Joe Perches](/assets/img/avatar_default.png)
Use the zeroing function instead of dma_alloc_coherent & memset(,0,) Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
213 lines
4.8 KiB
C
213 lines
4.8 KiB
C
/*
|
|
Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
|
|
<http://rt2x00.serialmonkey.com>
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/*
|
|
Module: rt2x00mmio
|
|
Abstract: rt2x00 generic mmio device routines.
|
|
*/
|
|
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "rt2x00.h"
|
|
#include "rt2x00mmio.h"
|
|
|
|
/*
|
|
* Register access.
|
|
*/
|
|
int rt2x00mmio_regbusy_read(struct rt2x00_dev *rt2x00dev,
|
|
const unsigned int offset,
|
|
const struct rt2x00_field32 field,
|
|
u32 *reg)
|
|
{
|
|
unsigned int i;
|
|
|
|
if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
|
|
return 0;
|
|
|
|
for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
|
|
rt2x00mmio_register_read(rt2x00dev, offset, reg);
|
|
if (!rt2x00_get_field32(*reg, field))
|
|
return 1;
|
|
udelay(REGISTER_BUSY_DELAY);
|
|
}
|
|
|
|
printk_once(KERN_ERR "%s() Indirect register access failed: "
|
|
"offset=0x%.08x, value=0x%.08x\n", __func__, offset, *reg);
|
|
*reg = ~0;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rt2x00mmio_regbusy_read);
|
|
|
|
bool rt2x00mmio_rxdone(struct rt2x00_dev *rt2x00dev)
|
|
{
|
|
struct data_queue *queue = rt2x00dev->rx;
|
|
struct queue_entry *entry;
|
|
struct queue_entry_priv_mmio *entry_priv;
|
|
struct skb_frame_desc *skbdesc;
|
|
int max_rx = 16;
|
|
|
|
while (--max_rx) {
|
|
entry = rt2x00queue_get_entry(queue, Q_INDEX);
|
|
entry_priv = entry->priv_data;
|
|
|
|
if (rt2x00dev->ops->lib->get_entry_state(entry))
|
|
break;
|
|
|
|
/*
|
|
* Fill in desc fields of the skb descriptor
|
|
*/
|
|
skbdesc = get_skb_frame_desc(entry->skb);
|
|
skbdesc->desc = entry_priv->desc;
|
|
skbdesc->desc_len = entry->queue->desc_size;
|
|
|
|
/*
|
|
* DMA is already done, notify rt2x00lib that
|
|
* it finished successfully.
|
|
*/
|
|
rt2x00lib_dmastart(entry);
|
|
rt2x00lib_dmadone(entry);
|
|
|
|
/*
|
|
* Send the frame to rt2x00lib for further processing.
|
|
*/
|
|
rt2x00lib_rxdone(entry, GFP_ATOMIC);
|
|
}
|
|
|
|
return !max_rx;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rt2x00mmio_rxdone);
|
|
|
|
void rt2x00mmio_flush_queue(struct data_queue *queue, bool drop)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; !rt2x00queue_empty(queue) && i < 10; i++)
|
|
msleep(10);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rt2x00mmio_flush_queue);
|
|
|
|
/*
|
|
* Device initialization handlers.
|
|
*/
|
|
static int rt2x00mmio_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
|
|
struct data_queue *queue)
|
|
{
|
|
struct queue_entry_priv_mmio *entry_priv;
|
|
void *addr;
|
|
dma_addr_t dma;
|
|
unsigned int i;
|
|
|
|
/*
|
|
* Allocate DMA memory for descriptor and buffer.
|
|
*/
|
|
addr = dma_zalloc_coherent(rt2x00dev->dev,
|
|
queue->limit * queue->desc_size, &dma,
|
|
GFP_KERNEL);
|
|
if (!addr)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Initialize all queue entries to contain valid addresses.
|
|
*/
|
|
for (i = 0; i < queue->limit; i++) {
|
|
entry_priv = queue->entries[i].priv_data;
|
|
entry_priv->desc = addr + i * queue->desc_size;
|
|
entry_priv->desc_dma = dma + i * queue->desc_size;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rt2x00mmio_free_queue_dma(struct rt2x00_dev *rt2x00dev,
|
|
struct data_queue *queue)
|
|
{
|
|
struct queue_entry_priv_mmio *entry_priv =
|
|
queue->entries[0].priv_data;
|
|
|
|
if (entry_priv->desc)
|
|
dma_free_coherent(rt2x00dev->dev,
|
|
queue->limit * queue->desc_size,
|
|
entry_priv->desc, entry_priv->desc_dma);
|
|
entry_priv->desc = NULL;
|
|
}
|
|
|
|
int rt2x00mmio_initialize(struct rt2x00_dev *rt2x00dev)
|
|
{
|
|
struct data_queue *queue;
|
|
int status;
|
|
|
|
/*
|
|
* Allocate DMA
|
|
*/
|
|
queue_for_each(rt2x00dev, queue) {
|
|
status = rt2x00mmio_alloc_queue_dma(rt2x00dev, queue);
|
|
if (status)
|
|
goto exit;
|
|
}
|
|
|
|
/*
|
|
* Register interrupt handler.
|
|
*/
|
|
status = request_irq(rt2x00dev->irq,
|
|
rt2x00dev->ops->lib->irq_handler,
|
|
IRQF_SHARED, rt2x00dev->name, rt2x00dev);
|
|
if (status) {
|
|
rt2x00_err(rt2x00dev, "IRQ %d allocation failed (error %d)\n",
|
|
rt2x00dev->irq, status);
|
|
goto exit;
|
|
}
|
|
|
|
return 0;
|
|
|
|
exit:
|
|
queue_for_each(rt2x00dev, queue)
|
|
rt2x00mmio_free_queue_dma(rt2x00dev, queue);
|
|
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rt2x00mmio_initialize);
|
|
|
|
void rt2x00mmio_uninitialize(struct rt2x00_dev *rt2x00dev)
|
|
{
|
|
struct data_queue *queue;
|
|
|
|
/*
|
|
* Free irq line.
|
|
*/
|
|
free_irq(rt2x00dev->irq, rt2x00dev);
|
|
|
|
/*
|
|
* Free DMA
|
|
*/
|
|
queue_for_each(rt2x00dev, queue)
|
|
rt2x00mmio_free_queue_dma(rt2x00dev, queue);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rt2x00mmio_uninitialize);
|
|
|
|
/*
|
|
* rt2x00mmio module information.
|
|
*/
|
|
MODULE_AUTHOR(DRV_PROJECT);
|
|
MODULE_VERSION(DRV_VERSION);
|
|
MODULE_DESCRIPTION("rt2x00 mmio library");
|
|
MODULE_LICENSE("GPL");
|