drivers/net/wireless/p54/p54pci.c - kernel/msm-4.19 - Gitiles


 /*
  * Linux device driver for PCI based Prism54
  *
  * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
  * Copyright (c) 2008, Christian Lamparter <chunkeey@web.de>
  *
  * Based on the islsm (softmac prism54) driver, which is:
  * Copyright 2004-2006 Jean-Baptiste Note <jean-baptiste.note@m4x.org>, et al.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/firmware.h>
 #include <linux/etherdevice.h>
 #include <linux/delay.h>
 #include <linux/completion.h>
 #include <net/mac80211.h>

 #include "p54.h"
 #include "p54pci.h"

 MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
 MODULE_DESCRIPTION("Prism54 PCI wireless driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("prism54pci");

 static struct pci_device_id p54p_table[] __devinitdata = {
 	/* Intersil PRISM Duette/Prism GT Wireless LAN adapter */
 	{ PCI_DEVICE(0x1260, 0x3890) },
 	/* 3COM 3CRWE154G72 Wireless LAN adapter */
 	{ PCI_DEVICE(0x10b7, 0x6001) },
 	/* Intersil PRISM Indigo Wireless LAN adapter */
 	{ PCI_DEVICE(0x1260, 0x3877) },
 	/* Intersil PRISM Javelin/Xbow Wireless LAN adapter */
 	{ PCI_DEVICE(0x1260, 0x3886) },
 	{ },
 };

 MODULE_DEVICE_TABLE(pci, p54p_table);

 static int p54p_upload_firmware(struct ieee80211_hw *dev)
 {
 	struct p54p_priv *priv = dev->priv;
 	const struct firmware *fw_entry = NULL;
 	__le32 reg;
 	int err;
 	__le32 *data;
 	u32 remains, left, device_addr;

 	P54P_WRITE(int_enable, cpu_to_le32(0));
 	P54P_READ(int_enable);
 	udelay(10);

 	reg = P54P_READ(ctrl_stat);
 	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
 	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RAMBOOT);
 	P54P_WRITE(ctrl_stat, reg);
 	P54P_READ(ctrl_stat);
 	udelay(10);

 	reg |= cpu_to_le32(ISL38XX_CTRL_STAT_RESET);
 	P54P_WRITE(ctrl_stat, reg);
 	wmb();
 	udelay(10);

 	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
 	P54P_WRITE(ctrl_stat, reg);
 	wmb();

 	mdelay(50);

 	err = request_firmware(&fw_entry, "isl3886", &priv->pdev->dev);
 	if (err) {
 		printk(KERN_ERR "%s (p54pci): cannot find firmware "
 		       "(isl3886)\n", pci_name(priv->pdev));
 		return err;
 	}

 	p54_parse_firmware(dev, fw_entry);

 	data = (__le32 *) fw_entry->data;
 	remains = fw_entry->size;
 	device_addr = ISL38XX_DEV_FIRMWARE_ADDR;
 	while (remains) {
 		u32 i = 0;
 		left = min((u32)0x1000, remains);
 		P54P_WRITE(direct_mem_base, cpu_to_le32(device_addr));
 		P54P_READ(int_enable);

 		device_addr += 0x1000;
 		while (i < left) {
 			P54P_WRITE(direct_mem_win[i], *data++);
 			i += sizeof(u32);
 		}

 		remains -= left;
 		P54P_READ(int_enable);
 	}

 	release_firmware(fw_entry);

 	reg = P54P_READ(ctrl_stat);
 	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_CLKRUN);
 	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
 	reg |= cpu_to_le32(ISL38XX_CTRL_STAT_RAMBOOT);
 	P54P_WRITE(ctrl_stat, reg);
 	P54P_READ(ctrl_stat);
 	udelay(10);

 	reg |= cpu_to_le32(ISL38XX_CTRL_STAT_RESET);
 	P54P_WRITE(ctrl_stat, reg);
 	wmb();
 	udelay(10);

 	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
 	P54P_WRITE(ctrl_stat, reg);
 	wmb();
 	udelay(10);

 	return 0;
 }

 static irqreturn_t p54p_simple_interrupt(int irq, void *dev_id)
 {
 	struct p54p_priv *priv = (struct p54p_priv *) dev_id;
 	__le32 reg;

 	reg = P54P_READ(int_ident);
 	P54P_WRITE(int_ack, reg);

 	if (reg & P54P_READ(int_enable))
 		complete(&priv->boot_comp);

 	return IRQ_HANDLED;
 }

 static int p54p_read_eeprom(struct ieee80211_hw *dev)
 {
 	struct p54p_priv *priv = dev->priv;
 	struct p54p_ring_control *ring_control = priv->ring_control;
 	int err;
 	struct p54_control_hdr *hdr;
 	void *eeprom;
 	dma_addr_t rx_mapping, tx_mapping;
 	u16 alen;

 	init_completion(&priv->boot_comp);
 	err = request_irq(priv->pdev->irq, &p54p_simple_interrupt,
 			  IRQF_SHARED, "p54pci", priv);
 	if (err) {
 		printk(KERN_ERR "%s (p54pci): failed to register IRQ handler\n",
 		       pci_name(priv->pdev));
 		return err;
 	}

 	eeprom = kmalloc(0x2010 + EEPROM_READBACK_LEN, GFP_KERNEL);
 	if (!eeprom) {
 		printk(KERN_ERR "%s (p54pci): no memory for eeprom!\n",
 		       pci_name(priv->pdev));
 		err = -ENOMEM;
 		goto out;
 	}

 	memset(ring_control, 0, sizeof(*ring_control));
 	P54P_WRITE(ring_control_base, cpu_to_le32(priv->ring_control_dma));
 	P54P_READ(ring_control_base);
 	udelay(10);

 	P54P_WRITE(int_enable, cpu_to_le32(ISL38XX_INT_IDENT_INIT));
 	P54P_READ(int_enable);
 	udelay(10);

 	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_RESET));

 	if (!wait_for_completion_interruptible_timeout(&priv->boot_comp, HZ)) {
 		printk(KERN_ERR "%s (p54pci): Cannot boot firmware!\n",
 		       pci_name(priv->pdev));
 		err = -EINVAL;
 		goto out;
 	}

 	P54P_WRITE(int_enable, cpu_to_le32(ISL38XX_INT_IDENT_UPDATE));
 	P54P_READ(int_enable);

 	hdr = eeprom + 0x2010;
 	p54_fill_eeprom_readback(hdr);
 	hdr->req_id = cpu_to_le32(priv->common.rx_start);

 	rx_mapping = pci_map_single(priv->pdev, eeprom,
 				    0x2010, PCI_DMA_FROMDEVICE);
 	tx_mapping = pci_map_single(priv->pdev, (void *)hdr,
 				    EEPROM_READBACK_LEN, PCI_DMA_TODEVICE);

 	ring_control->rx_mgmt[0].host_addr = cpu_to_le32(rx_mapping);
 	ring_control->rx_mgmt[0].len = cpu_to_le16(0x2010);
 	ring_control->tx_data[0].host_addr = cpu_to_le32(tx_mapping);
 	ring_control->tx_data[0].device_addr = hdr->req_id;
 	ring_control->tx_data[0].len = cpu_to_le16(EEPROM_READBACK_LEN);

 	ring_control->host_idx[2] = cpu_to_le32(1);
 	ring_control->host_idx[1] = cpu_to_le32(1);

 	wmb();
 	mdelay(100);
 	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_UPDATE));

 	wait_for_completion_interruptible_timeout(&priv->boot_comp, HZ);
 	wait_for_completion_interruptible_timeout(&priv->boot_comp, HZ);

 	pci_unmap_single(priv->pdev, tx_mapping,
 			 EEPROM_READBACK_LEN, PCI_DMA_TODEVICE);
 	pci_unmap_single(priv->pdev, rx_mapping,
 			 0x2010, PCI_DMA_FROMDEVICE);

 	alen = le16_to_cpu(ring_control->rx_mgmt[0].len);
 	if (le32_to_cpu(ring_control->device_idx[2]) != 1 ||
 	    alen < 0x10) {
 		printk(KERN_ERR "%s (p54pci): Cannot read eeprom!\n",
 		       pci_name(priv->pdev));
 		err = -EINVAL;
 		goto out;
 	}

 	p54_parse_eeprom(dev, (u8 *)eeprom + 0x10, alen - 0x10);

  out:
 	kfree(eeprom);
 	P54P_WRITE(int_enable, cpu_to_le32(0));
 	P54P_READ(int_enable);
 	udelay(10);
 	free_irq(priv->pdev->irq, priv);
 	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_RESET));
 	return err;
 }

 static void p54p_refill_rx_ring(struct ieee80211_hw *dev,
 	int ring_index, struct p54p_desc *ring, u32 ring_limit,
 	struct sk_buff **rx_buf)
 {
 	struct p54p_priv *priv = dev->priv;
 	struct p54p_ring_control *ring_control = priv->ring_control;
 	u32 limit, idx, i;

 	idx = le32_to_cpu(ring_control->host_idx[ring_index]);
 	limit = idx;
 	limit -= le32_to_cpu(ring_control->device_idx[ring_index]);
 	limit = ring_limit - limit;

 	i = idx % ring_limit;
 	while (limit-- > 1) {
 		struct p54p_desc *desc = &ring[i];

 		if (!desc->host_addr) {
 			struct sk_buff *skb;
 			dma_addr_t mapping;
 			skb = dev_alloc_skb(MAX_RX_SIZE);
 			if (!skb)
 				break;

 			mapping = pci_map_single(priv->pdev,
 						 skb_tail_pointer(skb),
 						 MAX_RX_SIZE,
 						 PCI_DMA_FROMDEVICE);
 			desc->host_addr = cpu_to_le32(mapping);
 			desc->device_addr = 0;	// FIXME: necessary?
 			desc->len = cpu_to_le16(MAX_RX_SIZE);
 			desc->flags = 0;
 			rx_buf[i] = skb;
 		}

 		i++;
 		idx++;
 		i %= ring_limit;
 	}

 	wmb();
 	ring_control->host_idx[ring_index] = cpu_to_le32(idx);
 }

 static void p54p_check_rx_ring(struct ieee80211_hw *dev, u32 *index,
 	int ring_index, struct p54p_desc *ring, u32 ring_limit,
 	struct sk_buff **rx_buf)
 {
 	struct p54p_priv *priv = dev->priv;
 	struct p54p_ring_control *ring_control = priv->ring_control;
 	struct p54p_desc *desc;
 	u32 idx, i;

 	i = (*index) % ring_limit;
 	(*index) = idx = le32_to_cpu(ring_control->device_idx[ring_index]);
 	idx %= ring_limit;
 	while (i != idx) {
 		u16 len;
 		struct sk_buff *skb;
 		desc = &ring[i];
 		len = le16_to_cpu(desc->len);
 		skb = rx_buf[i];

 		if (!skb)
 			continue;

 		skb_put(skb, len);

 		if (p54_rx(dev, skb)) {
 			pci_unmap_single(priv->pdev,
 					 le32_to_cpu(desc->host_addr),
 					 MAX_RX_SIZE, PCI_DMA_FROMDEVICE);
 			rx_buf[i] = NULL;
 			desc->host_addr = 0;
 		} else {
 			skb_trim(skb, 0);
 			desc->len = cpu_to_le16(MAX_RX_SIZE);
 		}

 		i++;
 		i %= ring_limit;
 	}

 	p54p_refill_rx_ring(dev, ring_index, ring, ring_limit, rx_buf);
 }

 /* caller must hold priv->lock */
 static void p54p_check_tx_ring(struct ieee80211_hw *dev, u32 *index,
 	int ring_index, struct p54p_desc *ring, u32 ring_limit,
 	void **tx_buf)
 {
 	struct p54p_priv *priv = dev->priv;
 	struct p54p_ring_control *ring_control = priv->ring_control;
 	struct p54p_desc *desc;
 	u32 idx, i;

 	i = (*index) % ring_limit;
 	(*index) = idx = le32_to_cpu(ring_control->device_idx[1]);
 	idx %= ring_limit;

 	while (i != idx) {
 		desc = &ring[i];
 		kfree(tx_buf[i]);
 		tx_buf[i] = NULL;

 		pci_unmap_single(priv->pdev, le32_to_cpu(desc->host_addr),
 				 le16_to_cpu(desc->len), PCI_DMA_TODEVICE);

 		desc->host_addr = 0;
 		desc->device_addr = 0;
 		desc->len = 0;
 		desc->flags = 0;

 		i++;
 		i %= ring_limit;
 	}
 }

 static void p54p_rx_tasklet(unsigned long dev_id)
 {
 	struct ieee80211_hw *dev = (struct ieee80211_hw *)dev_id;
 	struct p54p_priv *priv = dev->priv;
 	struct p54p_ring_control *ring_control = priv->ring_control;

 	p54p_check_rx_ring(dev, &priv->rx_idx_mgmt, 2, ring_control->rx_mgmt,
 		ARRAY_SIZE(ring_control->rx_mgmt), priv->rx_buf_mgmt);

 	p54p_check_rx_ring(dev, &priv->rx_idx_data, 0, ring_control->rx_data,
 		ARRAY_SIZE(ring_control->rx_data), priv->rx_buf_data);

 	wmb();
 	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_UPDATE));
 }

 static irqreturn_t p54p_interrupt(int irq, void *dev_id)
 {
 	struct ieee80211_hw *dev = dev_id;
 	struct p54p_priv *priv = dev->priv;
 	struct p54p_ring_control *ring_control = priv->ring_control;
 	__le32 reg;

 	spin_lock(&priv->lock);
 	reg = P54P_READ(int_ident);
 	if (unlikely(reg == cpu_to_le32(0xFFFFFFFF))) {
 		spin_unlock(&priv->lock);
 		return IRQ_HANDLED;
 	}

 	P54P_WRITE(int_ack, reg);

 	reg &= P54P_READ(int_enable);

 	if (reg & cpu_to_le32(ISL38XX_INT_IDENT_UPDATE)) {
 		p54p_check_tx_ring(dev, &priv->tx_idx_mgmt,
 				   3, ring_control->tx_mgmt,
 				   ARRAY_SIZE(ring_control->tx_mgmt),
 				   priv->tx_buf_mgmt);

 		p54p_check_tx_ring(dev, &priv->tx_idx_data,
 				   1, ring_control->tx_data,
 				   ARRAY_SIZE(ring_control->tx_data),
 				   priv->tx_buf_data);

 		tasklet_schedule(&priv->rx_tasklet);

 	} else if (reg & cpu_to_le32(ISL38XX_INT_IDENT_INIT))
 		complete(&priv->boot_comp);

 	spin_unlock(&priv->lock);

 	return reg ? IRQ_HANDLED : IRQ_NONE;
 }

 static void p54p_tx(struct ieee80211_hw *dev, struct p54_control_hdr *data,
 		    size_t len, int free_on_tx)
 {
 	struct p54p_priv *priv = dev->priv;
 	struct p54p_ring_control *ring_control = priv->ring_control;
 	unsigned long flags;
 	struct p54p_desc *desc;
 	dma_addr_t mapping;
 	u32 device_idx, idx, i;

 	spin_lock_irqsave(&priv->lock, flags);

 	device_idx = le32_to_cpu(ring_control->device_idx[1]);
 	idx = le32_to_cpu(ring_control->host_idx[1]);
 	i = idx % ARRAY_SIZE(ring_control->tx_data);

 	mapping = pci_map_single(priv->pdev, data, len, PCI_DMA_TODEVICE);
 	desc = &ring_control->tx_data[i];
 	desc->host_addr = cpu_to_le32(mapping);
 	desc->device_addr = data->req_id;
 	desc->len = cpu_to_le16(len);
 	desc->flags = 0;

 	wmb();
 	ring_control->host_idx[1] = cpu_to_le32(idx + 1);

 	if (free_on_tx)
 		priv->tx_buf_data[i] = data;

 	spin_unlock_irqrestore(&priv->lock, flags);

 	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_UPDATE));
 	P54P_READ(dev_int);

 	/* FIXME: unlikely to happen because the device usually runs out of
 	   memory before we fill the ring up, but we can make it impossible */
 	if (idx - device_idx > ARRAY_SIZE(ring_control->tx_data) - 2)
 		printk(KERN_INFO "%s: tx overflow.\n", wiphy_name(dev->wiphy));
 }

 static int p54p_open(struct ieee80211_hw *dev)
 {
 	struct p54p_priv *priv = dev->priv;
 	int err;

 	init_completion(&priv->boot_comp);
 	err = request_irq(priv->pdev->irq, &p54p_interrupt,
 			  IRQF_SHARED, "p54pci", dev);
 	if (err) {
 		printk(KERN_ERR "%s: failed to register IRQ handler\n",
 		       wiphy_name(dev->wiphy));
 		return err;
 	}

 	memset(priv->ring_control, 0, sizeof(*priv->ring_control));
 	priv->rx_idx_data = priv->tx_idx_data = 0;
 	priv->rx_idx_mgmt = priv->tx_idx_mgmt = 0;

 	p54p_refill_rx_ring(dev, 0, priv->ring_control->rx_data,
 		ARRAY_SIZE(priv->ring_control->rx_data), priv->rx_buf_data);

 	p54p_refill_rx_ring(dev, 2, priv->ring_control->rx_mgmt,
 		ARRAY_SIZE(priv->ring_control->rx_mgmt), priv->rx_buf_mgmt);

 	p54p_upload_firmware(dev);

 	P54P_WRITE(ring_control_base, cpu_to_le32(priv->ring_control_dma));
 	P54P_READ(ring_control_base);
 	wmb();
 	udelay(10);

 	P54P_WRITE(int_enable, cpu_to_le32(ISL38XX_INT_IDENT_INIT));
 	P54P_READ(int_enable);
 	wmb();
 	udelay(10);

 	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_RESET));
 	P54P_READ(dev_int);

 	if (!wait_for_completion_interruptible_timeout(&priv->boot_comp, HZ)) {
 		printk(KERN_ERR "%s: Cannot boot firmware!\n",
 		       wiphy_name(dev->wiphy));
 		free_irq(priv->pdev->irq, dev);
 		return -ETIMEDOUT;
 	}

 	P54P_WRITE(int_enable, cpu_to_le32(ISL38XX_INT_IDENT_UPDATE));
 	P54P_READ(int_enable);
 	wmb();
 	udelay(10);

 	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_UPDATE));
 	P54P_READ(dev_int);
 	wmb();
 	udelay(10);

 	return 0;
 }

 static void p54p_stop(struct ieee80211_hw *dev)
 {
 	struct p54p_priv *priv = dev->priv;
 	struct p54p_ring_control *ring_control = priv->ring_control;
 	unsigned int i;
 	struct p54p_desc *desc;

 	tasklet_kill(&priv->rx_tasklet);

 	P54P_WRITE(int_enable, cpu_to_le32(0));
 	P54P_READ(int_enable);
 	udelay(10);

 	free_irq(priv->pdev->irq, dev);

 	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_RESET));

 	for (i = 0; i < ARRAY_SIZE(priv->rx_buf_data); i++) {
 		desc = &ring_control->rx_data[i];
 		if (desc->host_addr)
 			pci_unmap_single(priv->pdev,
 					 le32_to_cpu(desc->host_addr),
 					 MAX_RX_SIZE, PCI_DMA_FROMDEVICE);
 		kfree_skb(priv->rx_buf_data[i]);
 		priv->rx_buf_data[i] = NULL;
 	}

 	for (i = 0; i < ARRAY_SIZE(priv->rx_buf_mgmt); i++) {
 		desc = &ring_control->rx_mgmt[i];
 		if (desc->host_addr)
 			pci_unmap_single(priv->pdev,
 					 le32_to_cpu(desc->host_addr),
 					 MAX_RX_SIZE, PCI_DMA_FROMDEVICE);
 		kfree_skb(priv->rx_buf_mgmt[i]);
 		priv->rx_buf_mgmt[i] = NULL;
 	}

 	for (i = 0; i < ARRAY_SIZE(priv->tx_buf_data); i++) {
 		desc = &ring_control->tx_data[i];
 		if (desc->host_addr)
 			pci_unmap_single(priv->pdev,
 					 le32_to_cpu(desc->host_addr),
 					 le16_to_cpu(desc->len),
 					 PCI_DMA_TODEVICE);

 		kfree(priv->tx_buf_data[i]);
 		priv->tx_buf_data[i] = NULL;
 	}

 	for (i = 0; i < ARRAY_SIZE(priv->tx_buf_mgmt); i++) {
 		desc = &ring_control->tx_mgmt[i];
 		if (desc->host_addr)
 			pci_unmap_single(priv->pdev,
 					 le32_to_cpu(desc->host_addr),
 					 le16_to_cpu(desc->len),
 					 PCI_DMA_TODEVICE);

 		kfree(priv->tx_buf_mgmt[i]);
 		priv->tx_buf_mgmt[i] = NULL;
 	}

 	memset(ring_control, 0, sizeof(*ring_control));
 }

 static int __devinit p54p_probe(struct pci_dev *pdev,
 				const struct pci_device_id *id)
 {
 	struct p54p_priv *priv;
 	struct ieee80211_hw *dev;
 	unsigned long mem_addr, mem_len;
 	int err;
 	DECLARE_MAC_BUF(mac);

 	err = pci_enable_device(pdev);
 	if (err) {
 		printk(KERN_ERR "%s (p54pci): Cannot enable new PCI device\n",
 		       pci_name(pdev));
 		return err;
 	}

 	mem_addr = pci_resource_start(pdev, 0);
 	mem_len = pci_resource_len(pdev, 0);
 	if (mem_len < sizeof(struct p54p_csr)) {
 		printk(KERN_ERR "%s (p54pci): Too short PCI resources\n",
 		       pci_name(pdev));
 		pci_disable_device(pdev);
 		return err;
 	}

 	err = pci_request_regions(pdev, "p54pci");
 	if (err) {
 		printk(KERN_ERR "%s (p54pci): Cannot obtain PCI resources\n",
 		       pci_name(pdev));
 		return err;
 	}

 	if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) ||
 	    pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK)) {
 		printk(KERN_ERR "%s (p54pci): No suitable DMA available\n",
 		       pci_name(pdev));
 		goto err_free_reg;
 	}

 	pci_set_master(pdev);
 	pci_try_set_mwi(pdev);

 	pci_write_config_byte(pdev, 0x40, 0);
 	pci_write_config_byte(pdev, 0x41, 0);

 	dev = p54_init_common(sizeof(*priv));
 	if (!dev) {
 		printk(KERN_ERR "%s (p54pci): ieee80211 alloc failed\n",
 		       pci_name(pdev));
 		err = -ENOMEM;
 		goto err_free_reg;
 	}

 	priv = dev->priv;
 	priv->pdev = pdev;

 	SET_IEEE80211_DEV(dev, &pdev->dev);
 	pci_set_drvdata(pdev, dev);

 	priv->map = ioremap(mem_addr, mem_len);
 	if (!priv->map) {
 		printk(KERN_ERR "%s (p54pci): Cannot map device memory\n",
 		       pci_name(pdev));
 		err = -EINVAL;	// TODO: use a better error code?
 		goto err_free_dev;
 	}

 	priv->ring_control = pci_alloc_consistent(pdev, sizeof(*priv->ring_control),
 						  &priv->ring_control_dma);
 	if (!priv->ring_control) {
 		printk(KERN_ERR "%s (p54pci): Cannot allocate rings\n",
 		       pci_name(pdev));
 		err = -ENOMEM;
 		goto err_iounmap;
 	}
 	memset(priv->ring_control, 0, sizeof(*priv->ring_control));

 	err = p54p_upload_firmware(dev);
 	if (err)
 		goto err_free_desc;

 	err = p54p_read_eeprom(dev);
 	if (err)
 		goto err_free_desc;

 	priv->common.open = p54p_open;
 	priv->common.stop = p54p_stop;
 	priv->common.tx = p54p_tx;

 	spin_lock_init(&priv->lock);
 	tasklet_init(&priv->rx_tasklet, p54p_rx_tasklet, (unsigned long)dev);

 	err = ieee80211_register_hw(dev);
 	if (err) {
 		printk(KERN_ERR "%s (p54pci): Cannot register netdevice\n",
 		       pci_name(pdev));
 		goto err_free_common;
 	}

 	printk(KERN_INFO "%s: hwaddr %s, isl38%02x\n",
 	       wiphy_name(dev->wiphy),
 	       print_mac(mac, dev->wiphy->perm_addr),
 	       priv->common.version);

 	return 0;

  err_free_common:
 	p54_free_common(dev);

  err_free_desc:
 	pci_free_consistent(pdev, sizeof(*priv->ring_control),
 			    priv->ring_control, priv->ring_control_dma);

  err_iounmap:
 	iounmap(priv->map);

  err_free_dev:
 	pci_set_drvdata(pdev, NULL);
 	ieee80211_free_hw(dev);

  err_free_reg:
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
 	return err;
 }

 static void __devexit p54p_remove(struct pci_dev *pdev)
 {
 	struct ieee80211_hw *dev = pci_get_drvdata(pdev);
 	struct p54p_priv *priv;

 	if (!dev)
 		return;

 	ieee80211_unregister_hw(dev);
 	priv = dev->priv;
 	pci_free_consistent(pdev, sizeof(*priv->ring_control),
 			    priv->ring_control, priv->ring_control_dma);
 	p54_free_common(dev);
 	iounmap(priv->map);
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
 	ieee80211_free_hw(dev);
 }

 #ifdef CONFIG_PM
 static int p54p_suspend(struct pci_dev *pdev, pm_message_t state)
 {
 	struct ieee80211_hw *dev = pci_get_drvdata(pdev);
 	struct p54p_priv *priv = dev->priv;

 	if (priv->common.mode != IEEE80211_IF_TYPE_INVALID) {
 		ieee80211_stop_queues(dev);
 		p54p_stop(dev);
 	}

 	pci_save_state(pdev);
 	pci_set_power_state(pdev, pci_choose_state(pdev, state));
 	return 0;
 }

 static int p54p_resume(struct pci_dev *pdev)
 {
 	struct ieee80211_hw *dev = pci_get_drvdata(pdev);
 	struct p54p_priv *priv = dev->priv;

 	pci_set_power_state(pdev, PCI_D0);
 	pci_restore_state(pdev);

 	if (priv->common.mode != IEEE80211_IF_TYPE_INVALID) {
 		p54p_open(dev);
 		ieee80211_wake_queues(dev);
 	}

 	return 0;
 }
 #endif /* CONFIG_PM */

 static struct pci_driver p54p_driver = {
 	.name		= "p54pci",
 	.id_table	= p54p_table,
 	.probe		= p54p_probe,
 	.remove		= __devexit_p(p54p_remove),
 #ifdef CONFIG_PM
 	.suspend	= p54p_suspend,
 	.resume		= p54p_resume,
 #endif /* CONFIG_PM */
 };

 static int __init p54p_init(void)
 {
 	return pci_register_driver(&p54p_driver);
 }

 static void __exit p54p_exit(void)
 {
 	pci_unregister_driver(&p54p_driver);
 }

 module_init(p54p_init);
 module_exit(p54p_exit);

	/*
	* Linux device driver for PCI based Prism54
	*
	* Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
	* Copyright (c) 2008, Christian Lamparter <chunkeey@web.de>
	*
	* Based on the islsm (softmac prism54) driver, which is:
	* Copyright 2004-2006 Jean-Baptiste Note <jean-baptiste.note@m4x.org>, et al.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/init.h>
	#include <linux/pci.h>
	#include <linux/firmware.h>
	#include <linux/etherdevice.h>
	#include <linux/delay.h>
	#include <linux/completion.h>
	#include <net/mac80211.h>

	#include "p54.h"
	#include "p54pci.h"

	MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
	MODULE_DESCRIPTION("Prism54 PCI wireless driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("prism54pci");

	static struct pci_device_id p54p_table[] __devinitdata = {
	/* Intersil PRISM Duette/Prism GT Wireless LAN adapter */
	{ PCI_DEVICE(0x1260, 0x3890) },
	/* 3COM 3CRWE154G72 Wireless LAN adapter */
	{ PCI_DEVICE(0x10b7, 0x6001) },
	/* Intersil PRISM Indigo Wireless LAN adapter */
	{ PCI_DEVICE(0x1260, 0x3877) },
	/* Intersil PRISM Javelin/Xbow Wireless LAN adapter */
	{ PCI_DEVICE(0x1260, 0x3886) },
	{ },
	};

	MODULE_DEVICE_TABLE(pci, p54p_table);

	static int p54p_upload_firmware(struct ieee80211_hw *dev)
	{
	struct p54p_priv *priv = dev->priv;
	const struct firmware *fw_entry = NULL;
	__le32 reg;
	int err;
	__le32 *data;
	u32 remains, left, device_addr;

	P54P_WRITE(int_enable, cpu_to_le32(0));
	P54P_READ(int_enable);
	udelay(10);

	reg = P54P_READ(ctrl_stat);
	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RAMBOOT);
	P54P_WRITE(ctrl_stat, reg);
	P54P_READ(ctrl_stat);
	udelay(10);

	reg \|= cpu_to_le32(ISL38XX_CTRL_STAT_RESET);
	P54P_WRITE(ctrl_stat, reg);
	wmb();
	udelay(10);

	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
	P54P_WRITE(ctrl_stat, reg);
	wmb();

	mdelay(50);

	err = request_firmware(&fw_entry, "isl3886", &priv->pdev->dev);
	if (err) {
	printk(KERN_ERR "%s (p54pci): cannot find firmware "
	"(isl3886)\n", pci_name(priv->pdev));
	return err;
	}

	p54_parse_firmware(dev, fw_entry);

	data = (__le32 *) fw_entry->data;
	remains = fw_entry->size;
	device_addr = ISL38XX_DEV_FIRMWARE_ADDR;
	while (remains) {
	u32 i = 0;
	left = min((u32)0x1000, remains);
	P54P_WRITE(direct_mem_base, cpu_to_le32(device_addr));
	P54P_READ(int_enable);

	device_addr += 0x1000;
	while (i < left) {
	P54P_WRITE(direct_mem_win[i], *data++);
	i += sizeof(u32);
	}

	remains -= left;
	P54P_READ(int_enable);
	}

	release_firmware(fw_entry);

	reg = P54P_READ(ctrl_stat);
	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_CLKRUN);
	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
	reg \|= cpu_to_le32(ISL38XX_CTRL_STAT_RAMBOOT);
	P54P_WRITE(ctrl_stat, reg);
	P54P_READ(ctrl_stat);
	udelay(10);

	reg \|= cpu_to_le32(ISL38XX_CTRL_STAT_RESET);
	P54P_WRITE(ctrl_stat, reg);
	wmb();
	udelay(10);

	reg &= cpu_to_le32(~ISL38XX_CTRL_STAT_RESET);
	P54P_WRITE(ctrl_stat, reg);
	wmb();
	udelay(10);

	return 0;
	}

	static irqreturn_t p54p_simple_interrupt(int irq, void *dev_id)
	{
	struct p54p_priv priv = (struct p54p_priv ) dev_id;
	__le32 reg;

	reg = P54P_READ(int_ident);
	P54P_WRITE(int_ack, reg);

	if (reg & P54P_READ(int_enable))
	complete(&priv->boot_comp);

	return IRQ_HANDLED;
	}

	static int p54p_read_eeprom(struct ieee80211_hw *dev)
	{
	struct p54p_priv *priv = dev->priv;
	struct p54p_ring_control *ring_control = priv->ring_control;
	int err;
	struct p54_control_hdr *hdr;
	void *eeprom;
	dma_addr_t rx_mapping, tx_mapping;
	u16 alen;

	init_completion(&priv->boot_comp);
	err = request_irq(priv->pdev->irq, &p54p_simple_interrupt,
	IRQF_SHARED, "p54pci", priv);
	if (err) {
	printk(KERN_ERR "%s (p54pci): failed to register IRQ handler\n",
	pci_name(priv->pdev));
	return err;
	}

	eeprom = kmalloc(0x2010 + EEPROM_READBACK_LEN, GFP_KERNEL);
	if (!eeprom) {
	printk(KERN_ERR "%s (p54pci): no memory for eeprom!\n",
	pci_name(priv->pdev));
	err = -ENOMEM;
	goto out;
	}

	memset(ring_control, 0, sizeof(*ring_control));
	P54P_WRITE(ring_control_base, cpu_to_le32(priv->ring_control_dma));
	P54P_READ(ring_control_base);
	udelay(10);

	P54P_WRITE(int_enable, cpu_to_le32(ISL38XX_INT_IDENT_INIT));
	P54P_READ(int_enable);
	udelay(10);

	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_RESET));

	if (!wait_for_completion_interruptible_timeout(&priv->boot_comp, HZ)) {
	printk(KERN_ERR "%s (p54pci): Cannot boot firmware!\n",
	pci_name(priv->pdev));
	err = -EINVAL;
	goto out;
	}

	P54P_WRITE(int_enable, cpu_to_le32(ISL38XX_INT_IDENT_UPDATE));
	P54P_READ(int_enable);

	hdr = eeprom + 0x2010;
	p54_fill_eeprom_readback(hdr);
	hdr->req_id = cpu_to_le32(priv->common.rx_start);

	rx_mapping = pci_map_single(priv->pdev, eeprom,
	0x2010, PCI_DMA_FROMDEVICE);
	tx_mapping = pci_map_single(priv->pdev, (void *)hdr,
	EEPROM_READBACK_LEN, PCI_DMA_TODEVICE);

	ring_control->rx_mgmt[0].host_addr = cpu_to_le32(rx_mapping);
	ring_control->rx_mgmt[0].len = cpu_to_le16(0x2010);
	ring_control->tx_data[0].host_addr = cpu_to_le32(tx_mapping);
	ring_control->tx_data[0].device_addr = hdr->req_id;
	ring_control->tx_data[0].len = cpu_to_le16(EEPROM_READBACK_LEN);

	ring_control->host_idx[2] = cpu_to_le32(1);
	ring_control->host_idx[1] = cpu_to_le32(1);

	wmb();
	mdelay(100);
	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_UPDATE));

	wait_for_completion_interruptible_timeout(&priv->boot_comp, HZ);
	wait_for_completion_interruptible_timeout(&priv->boot_comp, HZ);

	pci_unmap_single(priv->pdev, tx_mapping,
	EEPROM_READBACK_LEN, PCI_DMA_TODEVICE);
	pci_unmap_single(priv->pdev, rx_mapping,
	0x2010, PCI_DMA_FROMDEVICE);

	alen = le16_to_cpu(ring_control->rx_mgmt[0].len);
	if (le32_to_cpu(ring_control->device_idx[2]) != 1 \|\|
	alen < 0x10) {
	printk(KERN_ERR "%s (p54pci): Cannot read eeprom!\n",
	pci_name(priv->pdev));
	err = -EINVAL;
	goto out;
	}

	p54_parse_eeprom(dev, (u8 *)eeprom + 0x10, alen - 0x10);

	out:
	kfree(eeprom);
	P54P_WRITE(int_enable, cpu_to_le32(0));
	P54P_READ(int_enable);
	udelay(10);
	free_irq(priv->pdev->irq, priv);
	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_RESET));
	return err;
	}

	static void p54p_refill_rx_ring(struct ieee80211_hw *dev,
	int ring_index, struct p54p_desc *ring, u32 ring_limit,
	struct sk_buff **rx_buf)
	{
	struct p54p_priv *priv = dev->priv;
	struct p54p_ring_control *ring_control = priv->ring_control;
	u32 limit, idx, i;

	idx = le32_to_cpu(ring_control->host_idx[ring_index]);
	limit = idx;
	limit -= le32_to_cpu(ring_control->device_idx[ring_index]);
	limit = ring_limit - limit;

	i = idx % ring_limit;
	while (limit-- > 1) {
	struct p54p_desc *desc = &ring[i];

	if (!desc->host_addr) {
	struct sk_buff *skb;
	dma_addr_t mapping;
	skb = dev_alloc_skb(MAX_RX_SIZE);
	if (!skb)
	break;

	mapping = pci_map_single(priv->pdev,
	skb_tail_pointer(skb),
	MAX_RX_SIZE,
	PCI_DMA_FROMDEVICE);
	desc->host_addr = cpu_to_le32(mapping);
	desc->device_addr = 0; // FIXME: necessary?
	desc->len = cpu_to_le16(MAX_RX_SIZE);
	desc->flags = 0;
	rx_buf[i] = skb;
	}

	i++;
	idx++;
	i %= ring_limit;
	}

	wmb();
	ring_control->host_idx[ring_index] = cpu_to_le32(idx);
	}

	static void p54p_check_rx_ring(struct ieee80211_hw dev, u32 index,
	int ring_index, struct p54p_desc *ring, u32 ring_limit,
	struct sk_buff **rx_buf)
	{
	struct p54p_priv *priv = dev->priv;
	struct p54p_ring_control *ring_control = priv->ring_control;
	struct p54p_desc *desc;
	u32 idx, i;

	i = (*index) % ring_limit;
	(*index) = idx = le32_to_cpu(ring_control->device_idx[ring_index]);
	idx %= ring_limit;
	while (i != idx) {
	u16 len;
	struct sk_buff *skb;
	desc = &ring[i];
	len = le16_to_cpu(desc->len);
	skb = rx_buf[i];

	if (!skb)
	continue;

	skb_put(skb, len);

	if (p54_rx(dev, skb)) {
	pci_unmap_single(priv->pdev,
	le32_to_cpu(desc->host_addr),
	MAX_RX_SIZE, PCI_DMA_FROMDEVICE);
	rx_buf[i] = NULL;
	desc->host_addr = 0;
	} else {
	skb_trim(skb, 0);
	desc->len = cpu_to_le16(MAX_RX_SIZE);
	}

	i++;
	i %= ring_limit;
	}

	p54p_refill_rx_ring(dev, ring_index, ring, ring_limit, rx_buf);
	}

	/* caller must hold priv->lock */
	static void p54p_check_tx_ring(struct ieee80211_hw dev, u32 index,
	int ring_index, struct p54p_desc *ring, u32 ring_limit,
	void **tx_buf)
	{
	struct p54p_priv *priv = dev->priv;
	struct p54p_ring_control *ring_control = priv->ring_control;
	struct p54p_desc *desc;
	u32 idx, i;

	i = (*index) % ring_limit;
	(*index) = idx = le32_to_cpu(ring_control->device_idx[1]);
	idx %= ring_limit;

	while (i != idx) {
	desc = &ring[i];
	kfree(tx_buf[i]);
	tx_buf[i] = NULL;

	pci_unmap_single(priv->pdev, le32_to_cpu(desc->host_addr),
	le16_to_cpu(desc->len), PCI_DMA_TODEVICE);

	desc->host_addr = 0;
	desc->device_addr = 0;
	desc->len = 0;
	desc->flags = 0;

	i++;
	i %= ring_limit;
	}
	}

	static void p54p_rx_tasklet(unsigned long dev_id)
	{
	struct ieee80211_hw dev = (struct ieee80211_hw )dev_id;
	struct p54p_priv *priv = dev->priv;
	struct p54p_ring_control *ring_control = priv->ring_control;

	p54p_check_rx_ring(dev, &priv->rx_idx_mgmt, 2, ring_control->rx_mgmt,
	ARRAY_SIZE(ring_control->rx_mgmt), priv->rx_buf_mgmt);

	p54p_check_rx_ring(dev, &priv->rx_idx_data, 0, ring_control->rx_data,
	ARRAY_SIZE(ring_control->rx_data), priv->rx_buf_data);

	wmb();
	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_UPDATE));
	}

	static irqreturn_t p54p_interrupt(int irq, void *dev_id)
	{
	struct ieee80211_hw *dev = dev_id;
	struct p54p_priv *priv = dev->priv;
	struct p54p_ring_control *ring_control = priv->ring_control;
	__le32 reg;

	spin_lock(&priv->lock);
	reg = P54P_READ(int_ident);
	if (unlikely(reg == cpu_to_le32(0xFFFFFFFF))) {
	spin_unlock(&priv->lock);
	return IRQ_HANDLED;
	}

	P54P_WRITE(int_ack, reg);

	reg &= P54P_READ(int_enable);

	if (reg & cpu_to_le32(ISL38XX_INT_IDENT_UPDATE)) {
	p54p_check_tx_ring(dev, &priv->tx_idx_mgmt,
	3, ring_control->tx_mgmt,
	ARRAY_SIZE(ring_control->tx_mgmt),
	priv->tx_buf_mgmt);

	p54p_check_tx_ring(dev, &priv->tx_idx_data,
	1, ring_control->tx_data,
	ARRAY_SIZE(ring_control->tx_data),
	priv->tx_buf_data);

	tasklet_schedule(&priv->rx_tasklet);

	} else if (reg & cpu_to_le32(ISL38XX_INT_IDENT_INIT))
	complete(&priv->boot_comp);

	spin_unlock(&priv->lock);

	return reg ? IRQ_HANDLED : IRQ_NONE;
	}

	static void p54p_tx(struct ieee80211_hw dev, struct p54_control_hdr data,
	size_t len, int free_on_tx)
	{
	struct p54p_priv *priv = dev->priv;
	struct p54p_ring_control *ring_control = priv->ring_control;
	unsigned long flags;
	struct p54p_desc *desc;
	dma_addr_t mapping;
	u32 device_idx, idx, i;

	spin_lock_irqsave(&priv->lock, flags);

	device_idx = le32_to_cpu(ring_control->device_idx[1]);
	idx = le32_to_cpu(ring_control->host_idx[1]);
	i = idx % ARRAY_SIZE(ring_control->tx_data);

	mapping = pci_map_single(priv->pdev, data, len, PCI_DMA_TODEVICE);
	desc = &ring_control->tx_data[i];
	desc->host_addr = cpu_to_le32(mapping);
	desc->device_addr = data->req_id;
	desc->len = cpu_to_le16(len);
	desc->flags = 0;

	wmb();
	ring_control->host_idx[1] = cpu_to_le32(idx + 1);

	if (free_on_tx)
	priv->tx_buf_data[i] = data;

	spin_unlock_irqrestore(&priv->lock, flags);

	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_UPDATE));
	P54P_READ(dev_int);

	/* FIXME: unlikely to happen because the device usually runs out of
	memory before we fill the ring up, but we can make it impossible */
	if (idx - device_idx > ARRAY_SIZE(ring_control->tx_data) - 2)
	printk(KERN_INFO "%s: tx overflow.\n", wiphy_name(dev->wiphy));
	}

	static int p54p_open(struct ieee80211_hw *dev)
	{
	struct p54p_priv *priv = dev->priv;
	int err;

	init_completion(&priv->boot_comp);
	err = request_irq(priv->pdev->irq, &p54p_interrupt,
	IRQF_SHARED, "p54pci", dev);
	if (err) {
	printk(KERN_ERR "%s: failed to register IRQ handler\n",
	wiphy_name(dev->wiphy));
	return err;
	}

	memset(priv->ring_control, 0, sizeof(*priv->ring_control));
	priv->rx_idx_data = priv->tx_idx_data = 0;
	priv->rx_idx_mgmt = priv->tx_idx_mgmt = 0;

	p54p_refill_rx_ring(dev, 0, priv->ring_control->rx_data,
	ARRAY_SIZE(priv->ring_control->rx_data), priv->rx_buf_data);

	p54p_refill_rx_ring(dev, 2, priv->ring_control->rx_mgmt,
	ARRAY_SIZE(priv->ring_control->rx_mgmt), priv->rx_buf_mgmt);

	p54p_upload_firmware(dev);

	P54P_WRITE(ring_control_base, cpu_to_le32(priv->ring_control_dma));
	P54P_READ(ring_control_base);
	wmb();
	udelay(10);

	P54P_WRITE(int_enable, cpu_to_le32(ISL38XX_INT_IDENT_INIT));
	P54P_READ(int_enable);
	wmb();
	udelay(10);

	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_RESET));
	P54P_READ(dev_int);

	if (!wait_for_completion_interruptible_timeout(&priv->boot_comp, HZ)) {
	printk(KERN_ERR "%s: Cannot boot firmware!\n",
	wiphy_name(dev->wiphy));
	free_irq(priv->pdev->irq, dev);
	return -ETIMEDOUT;
	}

	P54P_WRITE(int_enable, cpu_to_le32(ISL38XX_INT_IDENT_UPDATE));
	P54P_READ(int_enable);
	wmb();
	udelay(10);

	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_UPDATE));
	P54P_READ(dev_int);
	wmb();
	udelay(10);

	return 0;
	}

	static void p54p_stop(struct ieee80211_hw *dev)
	{
	struct p54p_priv *priv = dev->priv;
	struct p54p_ring_control *ring_control = priv->ring_control;
	unsigned int i;
	struct p54p_desc *desc;

	tasklet_kill(&priv->rx_tasklet);

	P54P_WRITE(int_enable, cpu_to_le32(0));
	P54P_READ(int_enable);
	udelay(10);

	free_irq(priv->pdev->irq, dev);

	P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_RESET));

	for (i = 0; i < ARRAY_SIZE(priv->rx_buf_data); i++) {
	desc = &ring_control->rx_data[i];
	if (desc->host_addr)
	pci_unmap_single(priv->pdev,
	le32_to_cpu(desc->host_addr),
	MAX_RX_SIZE, PCI_DMA_FROMDEVICE);
	kfree_skb(priv->rx_buf_data[i]);
	priv->rx_buf_data[i] = NULL;
	}

	for (i = 0; i < ARRAY_SIZE(priv->rx_buf_mgmt); i++) {
	desc = &ring_control->rx_mgmt[i];
	if (desc->host_addr)
	pci_unmap_single(priv->pdev,
	le32_to_cpu(desc->host_addr),
	MAX_RX_SIZE, PCI_DMA_FROMDEVICE);
	kfree_skb(priv->rx_buf_mgmt[i]);
	priv->rx_buf_mgmt[i] = NULL;
	}

	for (i = 0; i < ARRAY_SIZE(priv->tx_buf_data); i++) {
	desc = &ring_control->tx_data[i];
	if (desc->host_addr)
	pci_unmap_single(priv->pdev,
	le32_to_cpu(desc->host_addr),
	le16_to_cpu(desc->len),
	PCI_DMA_TODEVICE);

	kfree(priv->tx_buf_data[i]);
	priv->tx_buf_data[i] = NULL;
	}

	for (i = 0; i < ARRAY_SIZE(priv->tx_buf_mgmt); i++) {
	desc = &ring_control->tx_mgmt[i];
	if (desc->host_addr)
	pci_unmap_single(priv->pdev,
	le32_to_cpu(desc->host_addr),
	le16_to_cpu(desc->len),
	PCI_DMA_TODEVICE);

	kfree(priv->tx_buf_mgmt[i]);
	priv->tx_buf_mgmt[i] = NULL;
	}

	memset(ring_control, 0, sizeof(*ring_control));
	}

	static int __devinit p54p_probe(struct pci_dev *pdev,
	const struct pci_device_id *id)
	{
	struct p54p_priv *priv;
	struct ieee80211_hw *dev;
	unsigned long mem_addr, mem_len;
	int err;
	DECLARE_MAC_BUF(mac);

	err = pci_enable_device(pdev);
	if (err) {
	printk(KERN_ERR "%s (p54pci): Cannot enable new PCI device\n",
	pci_name(pdev));
	return err;
	}

	mem_addr = pci_resource_start(pdev, 0);
	mem_len = pci_resource_len(pdev, 0);
	if (mem_len < sizeof(struct p54p_csr)) {
	printk(KERN_ERR "%s (p54pci): Too short PCI resources\n",
	pci_name(pdev));
	pci_disable_device(pdev);
	return err;
	}

	err = pci_request_regions(pdev, "p54pci");
	if (err) {
	printk(KERN_ERR "%s (p54pci): Cannot obtain PCI resources\n",
	pci_name(pdev));
	return err;
	}

	if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) \|\|
	pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK)) {
	printk(KERN_ERR "%s (p54pci): No suitable DMA available\n",
	pci_name(pdev));
	goto err_free_reg;
	}

	pci_set_master(pdev);
	pci_try_set_mwi(pdev);

	pci_write_config_byte(pdev, 0x40, 0);
	pci_write_config_byte(pdev, 0x41, 0);

	dev = p54_init_common(sizeof(*priv));
	if (!dev) {
	printk(KERN_ERR "%s (p54pci): ieee80211 alloc failed\n",
	pci_name(pdev));
	err = -ENOMEM;
	goto err_free_reg;
	}

	priv = dev->priv;
	priv->pdev = pdev;

	SET_IEEE80211_DEV(dev, &pdev->dev);
	pci_set_drvdata(pdev, dev);

	priv->map = ioremap(mem_addr, mem_len);
	if (!priv->map) {
	printk(KERN_ERR "%s (p54pci): Cannot map device memory\n",
	pci_name(pdev));
	err = -EINVAL; // TODO: use a better error code?
	goto err_free_dev;
	}

	priv->ring_control = pci_alloc_consistent(pdev, sizeof(*priv->ring_control),
	&priv->ring_control_dma);
	if (!priv->ring_control) {
	printk(KERN_ERR "%s (p54pci): Cannot allocate rings\n",
	pci_name(pdev));
	err = -ENOMEM;
	goto err_iounmap;
	}
	memset(priv->ring_control, 0, sizeof(*priv->ring_control));

	err = p54p_upload_firmware(dev);
	if (err)
	goto err_free_desc;

	err = p54p_read_eeprom(dev);
	if (err)
	goto err_free_desc;

	priv->common.open = p54p_open;
	priv->common.stop = p54p_stop;
	priv->common.tx = p54p_tx;

	spin_lock_init(&priv->lock);
	tasklet_init(&priv->rx_tasklet, p54p_rx_tasklet, (unsigned long)dev);

	err = ieee80211_register_hw(dev);
	if (err) {
	printk(KERN_ERR "%s (p54pci): Cannot register netdevice\n",
	pci_name(pdev));
	goto err_free_common;
	}

	printk(KERN_INFO "%s: hwaddr %s, isl38%02x\n",
	wiphy_name(dev->wiphy),
	print_mac(mac, dev->wiphy->perm_addr),
	priv->common.version);

	return 0;

	err_free_common:
	p54_free_common(dev);

	err_free_desc:
	pci_free_consistent(pdev, sizeof(*priv->ring_control),
	priv->ring_control, priv->ring_control_dma);

	err_iounmap:
	iounmap(priv->map);

	err_free_dev:
	pci_set_drvdata(pdev, NULL);
	ieee80211_free_hw(dev);

	err_free_reg:
	pci_release_regions(pdev);
	pci_disable_device(pdev);
	return err;
	}

	static void __devexit p54p_remove(struct pci_dev *pdev)
	{
	struct ieee80211_hw *dev = pci_get_drvdata(pdev);
	struct p54p_priv *priv;

	if (!dev)
	return;

	ieee80211_unregister_hw(dev);
	priv = dev->priv;
	pci_free_consistent(pdev, sizeof(*priv->ring_control),
	priv->ring_control, priv->ring_control_dma);
	p54_free_common(dev);
	iounmap(priv->map);
	pci_release_regions(pdev);
	pci_disable_device(pdev);
	ieee80211_free_hw(dev);
	}

	#ifdef CONFIG_PM
	static int p54p_suspend(struct pci_dev *pdev, pm_message_t state)
	{
	struct ieee80211_hw *dev = pci_get_drvdata(pdev);
	struct p54p_priv *priv = dev->priv;

	if (priv->common.mode != IEEE80211_IF_TYPE_INVALID) {
	ieee80211_stop_queues(dev);
	p54p_stop(dev);
	}

	pci_save_state(pdev);
	pci_set_power_state(pdev, pci_choose_state(pdev, state));
	return 0;
	}

	static int p54p_resume(struct pci_dev *pdev)
	{
	struct ieee80211_hw *dev = pci_get_drvdata(pdev);
	struct p54p_priv *priv = dev->priv;

	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);

	if (priv->common.mode != IEEE80211_IF_TYPE_INVALID) {
	p54p_open(dev);
	ieee80211_wake_queues(dev);
	}

	return 0;
	}
	#endif /* CONFIG_PM */

	static struct pci_driver p54p_driver = {
	.name = "p54pci",
	.id_table = p54p_table,
	.probe = p54p_probe,
	.remove = __devexit_p(p54p_remove),
	#ifdef CONFIG_PM
	.suspend = p54p_suspend,
	.resume = p54p_resume,
	#endif /* CONFIG_PM */
	};

	static int __init p54p_init(void)
	{
	return pci_register_driver(&p54p_driver);
	}

	static void __exit p54p_exit(void)
	{
	pci_unregister_driver(&p54p_driver);
	}

	module_init(p54p_init);
	module_exit(p54p_exit);