487 lines
11 KiB
C
487 lines
11 KiB
C
/*
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Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
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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 "rt2x00.h"
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#include "rt2x00pci.h"
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/*
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* TX data handlers.
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*/
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int rt2x00pci_write_tx_data(struct queue_entry *entry)
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{
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struct queue_entry_priv_pci *entry_priv = entry->priv_data;
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struct skb_frame_desc *skbdesc;
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u32 word;
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rt2x00_desc_read(entry_priv->desc, 0, &word);
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/*
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* This should not happen, we already checked the entry
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* was ours. When the hardware disagrees there has been
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* a queue corruption!
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*/
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if (unlikely(rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
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rt2x00_get_field32(word, TXD_ENTRY_VALID))) {
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ERROR(entry->queue->rt2x00dev,
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"Corrupt queue %d, accessing entry which is not ours.\n"
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"Please file bug report to %s.\n",
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entry->queue->qid, DRV_PROJECT);
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return -EINVAL;
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}
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/*
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* Fill in skb descriptor
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*/
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skbdesc = get_skb_frame_desc(entry->skb);
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memset(skbdesc, 0, sizeof(*skbdesc));
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skbdesc->desc = entry_priv->desc;
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skbdesc->desc_len = entry->queue->desc_size;
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skbdesc->entry = entry;
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memcpy(entry_priv->data, entry->skb->data, entry->skb->len);
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return 0;
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}
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EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
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/*
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* TX/RX data handlers.
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*/
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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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struct rxdone_entry_desc rxdesc;
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u32 word;
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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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rt2x00_desc_read(entry_priv->desc, 0, &word);
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if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
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break;
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memset(&rxdesc, 0, sizeof(rxdesc));
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rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
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/*
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* Allocate the sk_buffer and copy all data into it.
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*/
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entry->skb = rt2x00queue_alloc_rxskb(queue);
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if (!entry->skb)
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return;
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memcpy(entry->skb->data, entry_priv->data, rxdesc.size);
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skb_trim(entry->skb, rxdesc.size);
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/*
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* Fill in skb descriptor
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*/
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skbdesc = get_skb_frame_desc(entry->skb);
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memset(skbdesc, 0, sizeof(*skbdesc));
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skbdesc->desc = entry_priv->desc;
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skbdesc->desc_len = queue->desc_size;
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skbdesc->entry = entry;
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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(entry, &rxdesc);
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if (test_bit(DEVICE_ENABLED_RADIO, &queue->rt2x00dev->flags)) {
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rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
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rt2x00_desc_write(entry_priv->desc, 0, word);
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}
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rt2x00queue_index_inc(queue, Q_INDEX);
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}
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}
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EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
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void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry,
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struct txdone_entry_desc *txdesc)
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{
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struct queue_entry_priv_pci *entry_priv = entry->priv_data;
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enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
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u32 word;
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rt2x00lib_txdone(entry, txdesc);
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/*
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* Make this entry available for reuse.
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*/
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entry->flags = 0;
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rt2x00_desc_read(entry_priv->desc, 0, &word);
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rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
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rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
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rt2x00_desc_write(entry_priv->desc, 0, word);
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__clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
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rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
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/*
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* If the data queue was below the threshold before the txdone
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* handler we must make sure the packet queue in the mac80211 stack
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* is reenabled when the txdone handler has finished.
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*/
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if (!rt2x00queue_threshold(entry->queue))
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ieee80211_wake_queue(rt2x00dev->hw, qid);
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}
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EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
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/*
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* Device initialization handlers.
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*/
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#define desc_size(__queue) \
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({ \
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((__queue)->limit * (__queue)->desc_size);\
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})
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#define data_size(__queue) \
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({ \
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((__queue)->limit * (__queue)->data_size);\
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})
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#define dma_size(__queue) \
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({ \
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data_size(__queue) + desc_size(__queue);\
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})
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#define desc_offset(__queue, __base, __i) \
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({ \
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(__base) + data_size(__queue) + \
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((__i) * (__queue)->desc_size); \
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})
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#define data_offset(__queue, __base, __i) \
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({ \
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(__base) + \
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((__i) * (__queue)->data_size); \
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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 pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
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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 = pci_alloc_consistent(pci_dev, dma_size(queue), &dma);
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if (!addr)
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return -ENOMEM;
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memset(addr, 0, dma_size(queue));
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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 = desc_offset(queue, addr, i);
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entry_priv->desc_dma = desc_offset(queue, dma, i);
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entry_priv->data = data_offset(queue, addr, i);
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entry_priv->data_dma = data_offset(queue, dma, i);
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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 pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
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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->data)
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pci_free_consistent(pci_dev, dma_size(queue),
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entry_priv->data, entry_priv->data_dma);
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entry_priv->data = 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 pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
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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_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
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IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
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if (status) {
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ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
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pci_dev->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_pci(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 = rt2x00dev_pci(rt2x00dev);
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rt2x00dev->csr.base = ioremap(pci_resource_start(pci_dev, 0),
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pci_resource_len(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_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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return retval;
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}
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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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goto exit_release_regions;
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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 (pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
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ERROR_PROBE("PCI DMA not supported.\n");
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retval = -EIO;
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goto exit_disable_device;
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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_disable_device;
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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;
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rt2x00dev->ops = ops;
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rt2x00dev->hw = hw;
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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_disable_device:
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if (retval != -EBUSY)
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pci_disable_device(pci_dev);
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exit_release_regions:
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pci_release_regions(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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rt2x00pci_free_reg(rt2x00dev);
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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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int retval;
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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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retval = rt2x00pci_alloc_reg(rt2x00dev);
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if (retval)
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return retval;
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retval = rt2x00lib_resume(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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return retval;
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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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