482 lines
11 KiB
C
482 lines
11 KiB
C
/*
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Copyright (C) 2004 - 2007 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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/*
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* Set enviroment defines for rt2x00.h
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*/
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#define DRV_NAME "rt2x00pci"
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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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* Beacon handlers.
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*/
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int rt2x00pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
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struct ieee80211_tx_control *control)
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{
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struct rt2x00_dev *rt2x00dev = hw->priv;
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struct data_ring *ring =
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rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
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struct data_entry *entry = rt2x00_get_data_entry(ring);
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/*
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* Just in case mac80211 doesn't set this correctly,
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* but we need this queue set for the descriptor
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* initialization.
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*/
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control->queue = IEEE80211_TX_QUEUE_BEACON;
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/*
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* Update the beacon entry.
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*/
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memcpy(entry->data_addr, skb->data, skb->len);
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rt2x00lib_write_tx_desc(rt2x00dev, entry->priv,
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(struct ieee80211_hdr *)skb->data,
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skb->len, control);
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/*
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* Enable beacon generation.
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*/
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rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
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return 0;
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}
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EXPORT_SYMBOL_GPL(rt2x00pci_beacon_update);
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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 rt2x00_dev *rt2x00dev,
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struct data_ring *ring, struct sk_buff *skb,
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struct ieee80211_tx_control *control)
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{
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struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
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struct data_entry *entry = rt2x00_get_data_entry(ring);
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struct data_desc *txd = entry->priv;
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u32 word;
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if (rt2x00_ring_full(ring)) {
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ieee80211_stop_queue(rt2x00dev->hw, control->queue);
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return -EINVAL;
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}
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rt2x00_desc_read(txd, 0, &word);
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if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
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rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
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ERROR(rt2x00dev,
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"Arrived at non-free entry in the non-full queue %d.\n"
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"Please file bug report to %s.\n",
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control->queue, DRV_PROJECT);
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ieee80211_stop_queue(rt2x00dev->hw, control->queue);
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return -EINVAL;
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}
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entry->skb = skb;
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memcpy(&entry->tx_status.control, control, sizeof(*control));
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memcpy(entry->data_addr, skb->data, skb->len);
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rt2x00lib_write_tx_desc(rt2x00dev, txd, ieee80211hdr,
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skb->len, control);
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rt2x00_ring_index_inc(ring);
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if (rt2x00_ring_full(ring))
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ieee80211_stop_queue(rt2x00dev->hw, control->queue);
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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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* 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_ring *ring = rt2x00dev->rx;
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struct data_entry *entry;
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struct data_desc *rxd;
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struct sk_buff *skb;
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u32 desc;
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int retval;
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int signal;
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int rssi;
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int ofdm;
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int size;
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while (1) {
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entry = rt2x00_get_data_entry(ring);
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rxd = entry->priv;
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rt2x00_desc_read(rxd, 0, &desc);
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if (rt2x00_get_field32(desc, RXD_ENTRY_OWNER_NIC))
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break;
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retval = rt2x00dev->ops->lib->fill_rxdone(entry, &signal,
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&rssi, &ofdm, &size);
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if (retval)
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goto skip_entry;
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/*
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* Allocate the sk_buffer, initialize it and copy
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* all data into it.
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*/
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skb = dev_alloc_skb(size + NET_IP_ALIGN);
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if (!skb)
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return;
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skb_reserve(skb, NET_IP_ALIGN);
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skb_put(skb, size);
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memcpy(skb->data, entry->data_addr, 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(entry, skb, signal, rssi, ofdm);
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skip_entry:
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if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
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rt2x00_set_field32(&desc, RXD_ENTRY_OWNER_NIC, 1);
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rt2x00_desc_write(rxd, 0, desc);
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}
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rt2x00_ring_index_inc(ring);
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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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#define priv_offset(__ring, __i) \
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({ \
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ring->data_addr + (i * ring->desc_size); \
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})
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#define data_addr_offset(__ring, __i) \
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({ \
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(__ring)->data_addr + \
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((__ring)->stats.limit * (__ring)->desc_size) + \
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((__i) * (__ring)->data_size); \
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})
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#define data_dma_offset(__ring, __i) \
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({ \
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(__ring)->data_dma + \
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((__ring)->stats.limit * (__ring)->desc_size) + \
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((__i) * (__ring)->data_size); \
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})
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static int rt2x00pci_alloc_dma(struct rt2x00_dev *rt2x00dev,
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struct data_ring *ring)
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{
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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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ring->data_addr = pci_alloc_consistent(rt2x00dev_pci(rt2x00dev),
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rt2x00_get_ring_size(ring),
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&ring->data_dma);
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if (!ring->data_addr)
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return -ENOMEM;
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/*
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* Initialize all ring entries to contain valid
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* addresses.
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*/
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for (i = 0; i < ring->stats.limit; i++) {
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ring->entry[i].priv = priv_offset(ring, i);
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ring->entry[i].data_addr = data_addr_offset(ring, i);
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ring->entry[i].data_dma = data_dma_offset(ring, i);
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}
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return 0;
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}
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static void rt2x00pci_free_dma(struct rt2x00_dev *rt2x00dev,
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struct data_ring *ring)
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{
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if (ring->data_addr)
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pci_free_consistent(rt2x00dev_pci(rt2x00dev),
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rt2x00_get_ring_size(ring),
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ring->data_addr, ring->data_dma);
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ring->data_addr = 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_ring *ring;
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int status;
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/*
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* Allocate DMA
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*/
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ring_for_each(rt2x00dev, ring) {
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status = rt2x00pci_alloc_dma(rt2x00dev, ring);
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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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return status;
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}
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return 0;
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exit:
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rt2x00pci_uninitialize(rt2x00dev);
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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_ring *ring;
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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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ring_for_each(rt2x00dev, ring)
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rt2x00pci_free_dma(rt2x00dev, ring);
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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_addr) {
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iounmap(rt2x00dev->csr_addr);
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rt2x00dev->csr_addr = 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_addr = ioremap(pci_resource_start(pci_dev, 0),
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pci_resource_len(pci_dev, 0));
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if (!rt2x00dev->csr_addr)
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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_64BIT_MASK) &&
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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 library");
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MODULE_LICENSE("GPL");
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