/* Copyright (C) 2004 - 2009 Ivo van Doorn 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 #include "rt2x00.h" #include "rt2x00pci.h" /* * Register access. */ int rt2x00pci_regbusy_read(struct rt2x00_dev *rt2x00dev, const unsigned int offset, const struct rt2x00_field32 field, u32 *reg) { unsigned int i; if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) return 0; for (i = 0; i < REGISTER_BUSY_COUNT; i++) { rt2x00pci_register_read(rt2x00dev, offset, reg); if (!rt2x00_get_field32(*reg, field)) return 1; udelay(REGISTER_BUSY_DELAY); } ERROR(rt2x00dev, "Indirect register access failed: " "offset=0x%.08x, value=0x%.08x\n", offset, *reg); *reg = ~0; return 0; } EXPORT_SYMBOL_GPL(rt2x00pci_regbusy_read); /* * TX data handlers. */ int rt2x00pci_write_tx_data(struct queue_entry *entry, struct txentry_desc *txdesc) { struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; /* * This should not happen, we already checked the entry * was ours. When the hardware disagrees there has been * a queue corruption! */ if (unlikely(rt2x00dev->ops->lib->get_entry_state(entry))) { ERROR(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; } /* * Add the requested extra tx headroom in front of the skb. */ skb_push(entry->skb, rt2x00dev->ops->extra_tx_headroom); memset(entry->skb->data, 0, rt2x00dev->ops->extra_tx_headroom); /* * Call the driver's write_tx_datadesc function, if it exists. */ if (rt2x00dev->ops->lib->write_tx_datadesc) rt2x00dev->ops->lib->write_tx_datadesc(entry, txdesc); /* * Map the skb to DMA. */ if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags)) rt2x00queue_map_txskb(rt2x00dev, entry->skb); return 0; } EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data); /* * TX/RX data handlers. */ void rt2x00pci_txdone(struct queue_entry *entry, struct txdone_entry_desc *txdesc) { struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb); /* * Unmap the skb. */ rt2x00queue_unmap_skb(rt2x00dev, entry->skb); /* * Remove the extra tx headroom from the skb. */ skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom); /* * Signal that the TX descriptor is no longer in the skb. */ skbdesc->flags &= ~SKBDESC_DESC_IN_SKB; /* * Pass on to rt2x00lib. */ rt2x00lib_txdone(entry, txdesc); } EXPORT_SYMBOL_GPL(rt2x00pci_txdone); void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev) { struct data_queue *queue = rt2x00dev->rx; struct queue_entry *entry; struct queue_entry_priv_pci *entry_priv; struct skb_frame_desc *skbdesc; while (1) { entry = rt2x00queue_get_entry(queue, Q_INDEX); entry_priv = entry->priv_data; if (rt2x00dev->ops->lib->get_entry_state(entry)) break; /* * Fill in desc fields of the skb descriptor */ skbdesc = get_skb_frame_desc(entry->skb); skbdesc->desc = entry_priv->desc; skbdesc->desc_len = entry->queue->desc_size; /* * Send the frame to rt2x00lib for further processing. */ rt2x00lib_rxdone(rt2x00dev, entry); } } EXPORT_SYMBOL_GPL(rt2x00pci_rxdone); /* * Device initialization handlers. */ 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, queue->limit * queue->desc_size, &dma, GFP_KERNEL | GFP_DMA); if (!addr) return -ENOMEM; memset(addr, 0, queue->limit * queue->desc_size); /* * Initialize all queue entries to contain valid addresses. */ for (i = 0; i < queue->limit; i++) { entry_priv = queue->entries[i].priv_data; entry_priv->desc = addr + i * queue->desc_size; entry_priv->desc_dma = dma + i * queue->desc_size; } return 0; } static void 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->desc) dma_free_coherent(rt2x00dev->dev, queue->limit * queue->desc_size, entry_priv->desc, entry_priv->desc_dma); entry_priv->desc = NULL; } int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev) { 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(rt2x00dev->irq, rt2x00dev->ops->lib->irq_handler, IRQF_SHARED, rt2x00dev->name, rt2x00dev); if (status) { ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n", rt2x00dev->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(rt2x00dev->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 = pci_ioremap_bar(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_BIT_MASK(32))) { 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; rt2x00dev->irq = pci_dev->irq; rt2x00dev->name = pci_name(pci_dev); rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCI); 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; 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; 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; } return rt2x00lib_resume(rt2x00dev); } 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");