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// SPDX-License-Identifier: GPL-2.0-or-later
/*
Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
<http://rt2x00.serialmonkey.com>
*/
/*
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++) {
*reg = rt2x00mmio_register_read(rt2x00dev, offset);
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(50);
}
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_alloc_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");
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