[RT2x00]: add driver for Ralink wireless hardware

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 481 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00pci.c b/drivers/net/wireless/rt2x00/rt2x00pci.c
new file mode 100644
index 000000000000..85629f1999ab
--- /dev/null
+++ b/drivers/net/wireless/rt2x00/rt2x00pci.c
@@ -0,0 +1,481 @@
+/*
+	Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
+	<http://rt2x00.serialmonkey.com>
+
+	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.
+ */
+
+/*
+ * Set enviroment defines for rt2x00.h
+ */
+#define DRV_NAME "rt2x00pci"
+
+#include <linux/dma-mapping.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include "rt2x00.h"
+#include "rt2x00pci.h"
+
+/*
+ * Beacon handlers.
+ */
+int rt2x00pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
+			    struct ieee80211_tx_control *control)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct data_ring *ring =
+	    rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
+	struct data_entry *entry = rt2x00_get_data_entry(ring);
+
+	/*
+	 * Just in case mac80211 doesn't set this correctly,
+	 * but we need this queue set for the descriptor
+	 * initialization.
+	 */
+	control->queue = IEEE80211_TX_QUEUE_BEACON;
+
+	/*
+	 * Update the beacon entry.
+	 */
+	memcpy(entry->data_addr, skb->data, skb->len);
+	rt2x00lib_write_tx_desc(rt2x00dev, entry->priv,
+				(struct ieee80211_hdr *)skb->data,
+				skb->len, control);
+
+	/*
+	 * Enable beacon generation.
+	 */
+	rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00pci_beacon_update);
+
+/*
+ * TX data handlers.
+ */
+int rt2x00pci_write_tx_data(struct rt2x00_dev *rt2x00dev,
+			    struct data_ring *ring, struct sk_buff *skb,
+			    struct ieee80211_tx_control *control)
+{
+	struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
+	struct data_entry *entry = rt2x00_get_data_entry(ring);
+	struct data_desc *txd = entry->priv;
+	u32 word;
+
+	if (rt2x00_ring_full(ring)) {
+		ieee80211_stop_queue(rt2x00dev->hw, control->queue);
+		return -EINVAL;
+	}
+
+	rt2x00_desc_read(txd, 0, &word);
+
+	if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
+	    rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
+		ERROR(rt2x00dev,
+		      "Arrived at non-free entry in the non-full queue %d.\n"
+		      "Please file bug report to %s.\n",
+		      control->queue, DRV_PROJECT);
+		ieee80211_stop_queue(rt2x00dev->hw, control->queue);
+		return -EINVAL;
+	}
+
+	entry->skb = skb;
+	memcpy(&entry->tx_status.control, control, sizeof(*control));
+	memcpy(entry->data_addr, skb->data, skb->len);
+	rt2x00lib_write_tx_desc(rt2x00dev, txd, ieee80211hdr,
+				skb->len, control);
+
+	rt2x00_ring_index_inc(ring);
+
+	if (rt2x00_ring_full(ring))
+		ieee80211_stop_queue(rt2x00dev->hw, control->queue);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
+
+/*
+ * RX data handlers.
+ */
+void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
+{
+	struct data_ring *ring = rt2x00dev->rx;
+	struct data_entry *entry;
+	struct data_desc *rxd;
+	struct sk_buff *skb;
+	u32 desc;
+	int retval;
+	int signal;
+	int rssi;
+	int ofdm;
+	int size;
+
+	while (1) {
+		entry = rt2x00_get_data_entry(ring);
+		rxd = entry->priv;
+		rt2x00_desc_read(rxd, 0, &desc);
+
+		if (rt2x00_get_field32(desc, RXD_ENTRY_OWNER_NIC))
+			break;
+
+		retval = rt2x00dev->ops->lib->fill_rxdone(entry, &signal,
+							  &rssi, &ofdm, &size);
+		if (retval)
+			goto skip_entry;
+
+		/*
+		 * Allocate the sk_buffer, initialize it and copy
+		 * all data into it.
+		 */
+		skb = dev_alloc_skb(size + NET_IP_ALIGN);
+		if (!skb)
+			return;
+
+		skb_reserve(skb, NET_IP_ALIGN);
+		skb_put(skb, size);
+		memcpy(skb->data, entry->data_addr, size);
+
+		/*
+		 * Send the frame to rt2x00lib for further processing.
+		 */
+		rt2x00lib_rxdone(entry, skb, signal, rssi, ofdm);
+
+skip_entry:
+		if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
+			rt2x00_set_field32(&desc, RXD_ENTRY_OWNER_NIC, 1);
+			rt2x00_desc_write(rxd, 0, desc);
+		}
+
+		rt2x00_ring_index_inc(ring);
+	}
+}
+EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
+
+/*
+ * Device initialization handlers.
+ */
+#define priv_offset(__ring, __i)				\
+({								\
+	ring->data_addr + (i * ring->desc_size);		\
+})
+
+#define data_addr_offset(__ring, __i)				\
+({								\
+	(__ring)->data_addr +					\
+	    ((__ring)->stats.limit * (__ring)->desc_size) +	\
+	    ((__i) * (__ring)->data_size);			\
+})
+
+#define data_dma_offset(__ring, __i)				\
+({								\
+	(__ring)->data_dma +					\
+	    ((__ring)->stats.limit * (__ring)->desc_size) +	\
+	    ((__i) * (__ring)->data_size);			\
+})
+
+static int rt2x00pci_alloc_dma(struct rt2x00_dev *rt2x00dev,
+			       struct data_ring *ring)
+{
+	unsigned int i;
+
+	/*
+	 * Allocate DMA memory for descriptor and buffer.
+	 */
+	ring->data_addr = pci_alloc_consistent(rt2x00dev_pci(rt2x00dev),
+					       rt2x00_get_ring_size(ring),
+					       &ring->data_dma);
+	if (!ring->data_addr)
+		return -ENOMEM;
+
+	/*
+	 * Initialize all ring entries to contain valid
+	 * addresses.
+	 */
+	for (i = 0; i < ring->stats.limit; i++) {
+		ring->entry[i].priv = priv_offset(ring, i);
+		ring->entry[i].data_addr = data_addr_offset(ring, i);
+		ring->entry[i].data_dma = data_dma_offset(ring, i);
+	}
+
+	return 0;
+}
+
+static void rt2x00pci_free_dma(struct rt2x00_dev *rt2x00dev,
+			       struct data_ring *ring)
+{
+	if (ring->data_addr)
+		pci_free_consistent(rt2x00dev_pci(rt2x00dev),
+				    rt2x00_get_ring_size(ring),
+				    ring->data_addr, ring->data_dma);
+	ring->data_addr = NULL;
+}
+
+int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
+{
+	struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
+	struct data_ring *ring;
+	int status;
+
+	/*
+	 * Allocate DMA
+	 */
+	ring_for_each(rt2x00dev, ring) {
+		status = rt2x00pci_alloc_dma(rt2x00dev, ring);
+		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);
+		return status;
+	}
+
+	return 0;
+
+exit:
+	rt2x00pci_uninitialize(rt2x00dev);
+
+	return status;
+}
+EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
+
+void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
+{
+	struct data_ring *ring;
+
+	/*
+	 * Free irq line.
+	 */
+	free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
+
+	/*
+	 * Free DMA
+	 */
+	ring_for_each(rt2x00dev, ring)
+		rt2x00pci_free_dma(rt2x00dev, ring);
+}
+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_addr) {
+		iounmap(rt2x00dev->csr_addr);
+		rt2x00dev->csr_addr = NULL;
+	}
+}
+
+static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
+{
+	struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
+
+	rt2x00dev->csr_addr = ioremap(pci_resource_start(pci_dev, 0),
+				      pci_resource_len(pci_dev, 0));
+	if (!rt2x00dev->csr_addr)
+		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 (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
+	    pci_set_dma_mask(pci_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;
+	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 library");
+MODULE_LICENSE("GPL");