/* Copyright (C) 2004 - 2008 rt2x00 SourceForge Project 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, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* Module: rt2x00pci Abstract: rt2x00 generic pci device routines. */ #include #include #include #include #include "rt2x00.h" #include "rt2x00pci.h" /* * TX data handlers. */ int rt2x00pci_write_tx_data(struct queue_entry *entry) { struct queue_entry_priv_pci *entry_priv = entry->priv_data; struct skb_frame_desc *skbdesc; u32 word; rt2x00_desc_read(entry_priv->desc, 0, &word); /* * This should not happen, we already checked the entry * was ours. When the hardware disagrees there has been * a queue corruption! */ if (unlikely(rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) || rt2x00_get_field32(word, TXD_ENTRY_VALID))) { ERROR(entry->queue->rt2x00dev, "Corrupt queue %d, accessing entry which is not ours.\n" "Please file bug report to %s.\n", entry->queue->qid, DRV_PROJECT); return -EINVAL; } /* * Fill in skb descriptor */ skbdesc = get_skb_frame_desc(entry->skb); memset(skbdesc, 0, sizeof(*skbdesc)); skbdesc->desc = entry_priv->desc; skbdesc->desc_len = entry->queue->desc_size; skbdesc->entry = entry; memcpy(entry_priv->data, entry->skb->data, entry->skb->len); return 0; } EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data); /* * TX/RX data handlers. */ static void rt2x00pci_rxdone_entry(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry) { struct sk_buff *skb; struct skb_frame_desc *skbdesc; struct rxdone_entry_desc rxdesc; struct queue_entry_priv_pci *entry_priv = entry->priv_data; /* * Allocate a new sk_buffer. If no new buffer available, drop the * received frame and reuse the existing buffer. */ skb = rt2x00queue_alloc_skb(entry->queue); if (!skb) return; /* * Extract the RXD details. */ memset(&rxdesc, 0, sizeof(rxdesc)); rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc); /* * Copy the received data to the entries' skb. */ memcpy(entry->skb->data, entry_priv->data, rxdesc.size); skb_trim(entry->skb, rxdesc.size); /* * Fill in skb descriptor */ skbdesc = get_skb_frame_desc(entry->skb); memset(skbdesc, 0, sizeof(*skbdesc)); skbdesc->desc = entry_priv->desc; skbdesc->desc_len = entry->queue->desc_size; skbdesc->entry = entry; /* * Send the frame to rt2x00lib for further processing. */ rt2x00lib_rxdone(entry, &rxdesc); /* * Replace the entries' skb with the newly allocated one. */ entry->skb = skb; } void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev) { struct data_queue *queue = rt2x00dev->rx; struct queue_entry *entry; struct queue_entry_priv_pci *entry_priv; u32 word; while (1) { entry = rt2x00queue_get_entry(queue, Q_INDEX); entry_priv = entry->priv_data; rt2x00_desc_read(entry_priv->desc, 0, &word); if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC)) break; rt2x00pci_rxdone_entry(rt2x00dev, entry); if (test_bit(DEVICE_ENABLED_RADIO, &queue->rt2x00dev->flags)) { rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1); rt2x00_desc_write(entry_priv->desc, 0, word); } rt2x00queue_index_inc(queue, Q_INDEX); } } EXPORT_SYMBOL_GPL(rt2x00pci_rxdone); void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry, struct txdone_entry_desc *txdesc) { struct queue_entry_priv_pci *entry_priv = entry->priv_data; enum data_queue_qid qid = skb_get_queue_mapping(entry->skb); u32 word; rt2x00lib_txdone(entry, txdesc); /* * Make this entry available for reuse. */ entry->flags = 0; rt2x00_desc_read(entry_priv->desc, 0, &word); rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0); rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0); rt2x00_desc_write(entry_priv->desc, 0, word); __clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags); rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE); /* * If the data queue was below the threshold before the txdone * handler we must make sure the packet queue in the mac80211 stack * is reenabled when the txdone handler has finished. */ if (!rt2x00queue_threshold(entry->queue)) ieee80211_wake_queue(rt2x00dev->hw, qid); } EXPORT_SYMBOL_GPL(rt2x00pci_txdone); /* * Device initialization handlers. */ #define desc_size(__queue) \ ({ \ ((__queue)->limit * (__queue)->desc_size);\ }) #define data_size(__queue) \ ({ \ ((__queue)->limit * (__queue)->data_size);\ }) #define dma_size(__queue) \ ({ \ data_size(__queue) + desc_size(__queue);\ }) #define desc_offset(__queue, __base, __i) \ ({ \ (__base) + data_size(__queue) + \ ((__i) * (__queue)->desc_size); \ }) #define data_offset(__queue, __base, __i) \ ({ \ (__base) + \ ((__i) * (__queue)->data_size); \ }) static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev, struct data_queue *queue) { struct queue_entry_priv_pci *entry_priv; void *addr; dma_addr_t dma; unsigned int i; /* * Allocate DMA memory for descriptor and buffer. */ addr = dma_alloc_coherent(rt2x00dev->dev, dma_size(queue), &dma, GFP_KERNEL | GFP_DMA); if (!addr) return -ENOMEM; memset(addr, 0, dma_size(queue)); /* * 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 = desc_offset(queue, addr, i); entry_priv->desc_dma = desc_offset(queue, dma, i); entry_priv->data = data_offset(queue, addr, i); entry_priv->data_dma = data_offset(queue, dma, i); } return 0; } static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev, struct data_queue *queue) { struct queue_entry_priv_pci *entry_priv = queue->entries[0].priv_data; if (entry_priv->data) dma_free_coherent(rt2x00dev->dev, dma_size(queue), entry_priv->data, entry_priv->data_dma); entry_priv->data = NULL; } int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev) { struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev); struct data_queue *queue; int status; /* * Allocate DMA */ queue_for_each(rt2x00dev, queue) { status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue); if (status) goto exit; } /* * Register interrupt handler. */ status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler, IRQF_SHARED, pci_name(pci_dev), rt2x00dev); if (status) { ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n", pci_dev->irq, status); goto exit; } return 0; exit: queue_for_each(rt2x00dev, queue) rt2x00pci_free_queue_dma(rt2x00dev, queue); return status; } EXPORT_SYMBOL_GPL(rt2x00pci_initialize); void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev) { struct data_queue *queue; /* * Free irq line. */ free_irq(to_pci_dev(rt2x00dev->dev)->irq, rt2x00dev); /* * Free DMA */ queue_for_each(rt2x00dev, queue) rt2x00pci_free_queue_dma(rt2x00dev, queue); } EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize); /* * PCI driver handlers. */ static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev) { kfree(rt2x00dev->rf); rt2x00dev->rf = NULL; kfree(rt2x00dev->eeprom); rt2x00dev->eeprom = NULL; if (rt2x00dev->csr.base) { iounmap(rt2x00dev->csr.base); rt2x00dev->csr.base = NULL; } } static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev) { struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev); rt2x00dev->csr.base = ioremap(pci_resource_start(pci_dev, 0), pci_resource_len(pci_dev, 0)); if (!rt2x00dev->csr.base) goto exit; rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL); if (!rt2x00dev->eeprom) goto exit; rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL); if (!rt2x00dev->rf) goto exit; return 0; exit: ERROR_PROBE("Failed to allocate registers.\n"); rt2x00pci_free_reg(rt2x00dev); return -ENOMEM; } int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id) { struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data; struct ieee80211_hw *hw; struct rt2x00_dev *rt2x00dev; int retval; retval = pci_request_regions(pci_dev, pci_name(pci_dev)); if (retval) { ERROR_PROBE("PCI request regions failed.\n"); return retval; } retval = pci_enable_device(pci_dev); if (retval) { ERROR_PROBE("Enable device failed.\n"); goto exit_release_regions; } pci_set_master(pci_dev); if (pci_set_mwi(pci_dev)) ERROR_PROBE("MWI not available.\n"); if (dma_set_mask(&pci_dev->dev, DMA_32BIT_MASK)) { ERROR_PROBE("PCI DMA not supported.\n"); retval = -EIO; goto exit_disable_device; } hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw); if (!hw) { ERROR_PROBE("Failed to allocate hardware.\n"); retval = -ENOMEM; goto exit_disable_device; } pci_set_drvdata(pci_dev, hw); rt2x00dev = hw->priv; rt2x00dev->dev = &pci_dev->dev; rt2x00dev->ops = ops; rt2x00dev->hw = hw; retval = rt2x00pci_alloc_reg(rt2x00dev); if (retval) goto exit_free_device; retval = rt2x00lib_probe_dev(rt2x00dev); if (retval) goto exit_free_reg; return 0; exit_free_reg: rt2x00pci_free_reg(rt2x00dev); exit_free_device: ieee80211_free_hw(hw); exit_disable_device: if (retval != -EBUSY) pci_disable_device(pci_dev); exit_release_regions: pci_release_regions(pci_dev); pci_set_drvdata(pci_dev, NULL); return retval; } EXPORT_SYMBOL_GPL(rt2x00pci_probe); void rt2x00pci_remove(struct pci_dev *pci_dev) { struct ieee80211_hw *hw = pci_get_drvdata(pci_dev); struct rt2x00_dev *rt2x00dev = hw->priv; /* * Free all allocated data. */ rt2x00lib_remove_dev(rt2x00dev); rt2x00pci_free_reg(rt2x00dev); ieee80211_free_hw(hw); /* * Free the PCI device data. */ pci_set_drvdata(pci_dev, NULL); pci_disable_device(pci_dev); pci_release_regions(pci_dev); } EXPORT_SYMBOL_GPL(rt2x00pci_remove); #ifdef CONFIG_PM int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state) { struct ieee80211_hw *hw = pci_get_drvdata(pci_dev); struct rt2x00_dev *rt2x00dev = hw->priv; int retval; retval = rt2x00lib_suspend(rt2x00dev, state); if (retval) return retval; rt2x00pci_free_reg(rt2x00dev); pci_save_state(pci_dev); pci_disable_device(pci_dev); return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state)); } EXPORT_SYMBOL_GPL(rt2x00pci_suspend); int rt2x00pci_resume(struct pci_dev *pci_dev) { struct ieee80211_hw *hw = pci_get_drvdata(pci_dev); struct rt2x00_dev *rt2x00dev = hw->priv; int retval; if (pci_set_power_state(pci_dev, PCI_D0) || pci_enable_device(pci_dev) || pci_restore_state(pci_dev)) { ERROR(rt2x00dev, "Failed to resume device.\n"); return -EIO; } retval = rt2x00pci_alloc_reg(rt2x00dev); if (retval) return retval; retval = rt2x00lib_resume(rt2x00dev); if (retval) goto exit_free_reg; return 0; exit_free_reg: rt2x00pci_free_reg(rt2x00dev); return retval; } EXPORT_SYMBOL_GPL(rt2x00pci_resume); #endif /* CONFIG_PM */ /* * rt2x00pci module information. */ MODULE_AUTHOR(DRV_PROJECT); MODULE_VERSION(DRV_VERSION); MODULE_DESCRIPTION("rt2x00 pci library"); MODULE_LICENSE("GPL");