mirror of https://gitee.com/openkylin/linux.git
377 lines
8.4 KiB
C
377 lines
8.4 KiB
C
/*
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Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
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<http://rt2x00.serialmonkey.com>
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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, or
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(at your option) any later version.
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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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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
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Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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Module: rt2x00pci
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Abstract: rt2x00 generic pci device routines.
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*/
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#include <linux/dma-mapping.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include "rt2x00.h"
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#include "rt2x00pci.h"
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/*
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* Register access.
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*/
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int rt2x00pci_regbusy_read(struct rt2x00_dev *rt2x00dev,
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const unsigned int offset,
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const struct rt2x00_field32 field,
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u32 *reg)
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{
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unsigned int i;
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if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
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return 0;
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for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
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rt2x00pci_register_read(rt2x00dev, offset, reg);
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if (!rt2x00_get_field32(*reg, field))
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return 1;
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udelay(REGISTER_BUSY_DELAY);
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}
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ERROR(rt2x00dev, "Indirect register access failed: "
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"offset=0x%.08x, value=0x%.08x\n", offset, *reg);
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*reg = ~0;
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return 0;
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}
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EXPORT_SYMBOL_GPL(rt2x00pci_regbusy_read);
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void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
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{
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struct data_queue *queue = rt2x00dev->rx;
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struct queue_entry *entry;
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struct queue_entry_priv_pci *entry_priv;
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struct skb_frame_desc *skbdesc;
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while (1) {
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entry = rt2x00queue_get_entry(queue, Q_INDEX);
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entry_priv = entry->priv_data;
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if (rt2x00dev->ops->lib->get_entry_state(entry))
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break;
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/*
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* Fill in desc fields of the skb descriptor
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*/
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skbdesc = get_skb_frame_desc(entry->skb);
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skbdesc->desc = entry_priv->desc;
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skbdesc->desc_len = entry->queue->desc_size;
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/*
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* Send the frame to rt2x00lib for further processing.
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*/
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rt2x00lib_rxdone(rt2x00dev, entry);
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}
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}
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EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
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/*
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* Device initialization handlers.
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*/
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static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
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struct data_queue *queue)
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{
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struct queue_entry_priv_pci *entry_priv;
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void *addr;
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dma_addr_t dma;
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unsigned int i;
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/*
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* Allocate DMA memory for descriptor and buffer.
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*/
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addr = dma_alloc_coherent(rt2x00dev->dev,
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queue->limit * queue->desc_size,
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&dma, GFP_KERNEL | GFP_DMA);
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if (!addr)
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return -ENOMEM;
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memset(addr, 0, queue->limit * queue->desc_size);
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/*
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* Initialize all queue entries to contain valid addresses.
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*/
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for (i = 0; i < queue->limit; i++) {
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entry_priv = queue->entries[i].priv_data;
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entry_priv->desc = addr + i * queue->desc_size;
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entry_priv->desc_dma = dma + i * queue->desc_size;
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}
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return 0;
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}
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static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
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struct data_queue *queue)
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{
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struct queue_entry_priv_pci *entry_priv =
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queue->entries[0].priv_data;
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if (entry_priv->desc)
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dma_free_coherent(rt2x00dev->dev,
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queue->limit * queue->desc_size,
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entry_priv->desc, entry_priv->desc_dma);
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entry_priv->desc = NULL;
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}
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int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
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{
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struct data_queue *queue;
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int status;
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/*
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* Allocate DMA
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*/
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queue_for_each(rt2x00dev, queue) {
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status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
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if (status)
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goto exit;
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}
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/*
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* Register interrupt handler.
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*/
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status = request_threaded_irq(rt2x00dev->irq,
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rt2x00dev->ops->lib->irq_handler,
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rt2x00dev->ops->lib->irq_handler_thread,
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IRQF_SHARED, rt2x00dev->name, rt2x00dev);
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if (status) {
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ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
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rt2x00dev->irq, status);
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goto exit;
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}
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return 0;
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exit:
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queue_for_each(rt2x00dev, queue)
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rt2x00pci_free_queue_dma(rt2x00dev, queue);
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return status;
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}
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EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
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void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
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{
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struct data_queue *queue;
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/*
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* Free irq line.
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*/
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free_irq(rt2x00dev->irq, rt2x00dev);
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/*
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* Free DMA
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*/
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queue_for_each(rt2x00dev, queue)
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rt2x00pci_free_queue_dma(rt2x00dev, queue);
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}
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EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
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/*
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* PCI driver handlers.
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*/
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static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
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{
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kfree(rt2x00dev->rf);
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rt2x00dev->rf = NULL;
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kfree(rt2x00dev->eeprom);
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rt2x00dev->eeprom = NULL;
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if (rt2x00dev->csr.base) {
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iounmap(rt2x00dev->csr.base);
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rt2x00dev->csr.base = NULL;
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}
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}
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static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
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{
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struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
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rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
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if (!rt2x00dev->csr.base)
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goto exit;
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rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
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if (!rt2x00dev->eeprom)
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goto exit;
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rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
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if (!rt2x00dev->rf)
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goto exit;
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return 0;
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exit:
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ERROR_PROBE("Failed to allocate registers.\n");
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rt2x00pci_free_reg(rt2x00dev);
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return -ENOMEM;
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}
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int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
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{
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struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
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struct ieee80211_hw *hw;
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struct rt2x00_dev *rt2x00dev;
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int retval;
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retval = pci_enable_device(pci_dev);
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if (retval) {
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ERROR_PROBE("Enable device failed.\n");
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return retval;
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}
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retval = pci_request_regions(pci_dev, pci_name(pci_dev));
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if (retval) {
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ERROR_PROBE("PCI request regions failed.\n");
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goto exit_disable_device;
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}
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pci_set_master(pci_dev);
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if (pci_set_mwi(pci_dev))
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ERROR_PROBE("MWI not available.\n");
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if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
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ERROR_PROBE("PCI DMA not supported.\n");
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retval = -EIO;
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goto exit_release_regions;
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}
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hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
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if (!hw) {
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ERROR_PROBE("Failed to allocate hardware.\n");
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retval = -ENOMEM;
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goto exit_release_regions;
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}
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pci_set_drvdata(pci_dev, hw);
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rt2x00dev = hw->priv;
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rt2x00dev->dev = &pci_dev->dev;
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rt2x00dev->ops = ops;
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rt2x00dev->hw = hw;
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rt2x00dev->irq = pci_dev->irq;
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rt2x00dev->name = pci_name(pci_dev);
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if (pci_dev->is_pcie)
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rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCIE);
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else
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rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCI);
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retval = rt2x00pci_alloc_reg(rt2x00dev);
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if (retval)
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goto exit_free_device;
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retval = rt2x00lib_probe_dev(rt2x00dev);
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if (retval)
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goto exit_free_reg;
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return 0;
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exit_free_reg:
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rt2x00pci_free_reg(rt2x00dev);
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exit_free_device:
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ieee80211_free_hw(hw);
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exit_release_regions:
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pci_release_regions(pci_dev);
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exit_disable_device:
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pci_disable_device(pci_dev);
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pci_set_drvdata(pci_dev, NULL);
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return retval;
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}
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EXPORT_SYMBOL_GPL(rt2x00pci_probe);
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void rt2x00pci_remove(struct pci_dev *pci_dev)
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{
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struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
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struct rt2x00_dev *rt2x00dev = hw->priv;
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/*
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* Free all allocated data.
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*/
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rt2x00lib_remove_dev(rt2x00dev);
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rt2x00pci_free_reg(rt2x00dev);
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ieee80211_free_hw(hw);
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/*
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* Free the PCI device data.
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*/
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pci_set_drvdata(pci_dev, NULL);
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pci_disable_device(pci_dev);
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pci_release_regions(pci_dev);
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}
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EXPORT_SYMBOL_GPL(rt2x00pci_remove);
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#ifdef CONFIG_PM
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int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
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{
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struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
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struct rt2x00_dev *rt2x00dev = hw->priv;
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int retval;
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retval = rt2x00lib_suspend(rt2x00dev, state);
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if (retval)
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return retval;
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pci_save_state(pci_dev);
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pci_disable_device(pci_dev);
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return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
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}
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EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
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int rt2x00pci_resume(struct pci_dev *pci_dev)
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{
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struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
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struct rt2x00_dev *rt2x00dev = hw->priv;
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if (pci_set_power_state(pci_dev, PCI_D0) ||
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pci_enable_device(pci_dev) ||
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pci_restore_state(pci_dev)) {
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ERROR(rt2x00dev, "Failed to resume device.\n");
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return -EIO;
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}
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return rt2x00lib_resume(rt2x00dev);
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}
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EXPORT_SYMBOL_GPL(rt2x00pci_resume);
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#endif /* CONFIG_PM */
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/*
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* rt2x00pci module information.
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*/
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MODULE_AUTHOR(DRV_PROJECT);
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MODULE_VERSION(DRV_VERSION);
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MODULE_DESCRIPTION("rt2x00 pci library");
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MODULE_LICENSE("GPL");
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