rtl8187_dev.c

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/*
 * Linux device driver for RTL8187
 *
 * Copyright 2007 Michael Wu <[e-mail]>
 * Copyright 2007 Andrea Merello <[e-mail]>
 *
 * Based on the r8187 driver, which is:
 * Copyright 2005 Andrea Merello <[e-mail]>, et al.
 *
 * Magic delays and register offsets below are taken from the original
 * r8187 driver sources.  Thanks to Realtek for their support!
 *
 * 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/usb.h>
#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/eeprom_93cx6.h>
#include <net/mac80211.h>

#include "rtl8187.h"
#include "rtl8187_rtl8225.h"

MODULE_AUTHOR("Michael Wu <[e-mail]>");
MODULE_AUTHOR("Andrea Merello <[e-mail]>");
MODULE_DESCRIPTION("RTL8187 USB wireless driver");
MODULE_LICENSE("GPL");

static struct usb_device_id rtl8187_table[] __devinitdata = {
	/* Realtek */
	{USB_DEVICE(0x0bda, 0x8187)},
	/* Netgear */
	{USB_DEVICE(0x0846, 0x6100)},
	{USB_DEVICE(0x0846, 0x6a00)},
	/* HP */
	{USB_DEVICE(0x03f0, 0xca02)},
	/* Sitecom */
	{USB_DEVICE(0x0df6, 0x000d)},
	{}
};

MODULE_DEVICE_TABLE(usb, rtl8187_table);

static void rtl8187_iowrite_async_cb(struct urb *urb)
{
	kfree(urb->context);
	usb_free_urb(urb);
}

static void rtl8187_iowrite_async(struct rtl8187_priv *priv, __le16 addr,
				  void *data, u16 len)
{
	struct usb_ctrlrequest *dr;
	struct urb *urb;
	struct rtl8187_async_write_data {
		u8 data[4];
		struct usb_ctrlrequest dr;
	} *buf;

	buf = kmalloc(sizeof(*buf), GFP_ATOMIC);
	if (!buf)
		return;

	urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!urb) {
		kfree(buf);
		return;
	}

	dr = &buf->dr;

	dr->bRequestType = RTL8187_REQT_WRITE;
	dr->bRequest = RTL8187_REQ_SET_REG;
	dr->wValue = addr;
	dr->wIndex = 0;
	dr->wLength = cpu_to_le16(len);

	memcpy(buf, data, len);

	usb_fill_control_urb(urb, priv->udev, usb_sndctrlpipe(priv->udev, 0),
			     (unsigned char *)dr, buf, len,
			     rtl8187_iowrite_async_cb, buf);
	usb_submit_urb(urb, GFP_ATOMIC);
}

static inline void rtl818x_iowrite32_async(struct rtl8187_priv *priv,
					   __le32 *addr, u32 val)
{
	__le32 buf = cpu_to_le32(val);

	rtl8187_iowrite_async(priv, cpu_to_le16((unsigned long)addr),
			      &buf, sizeof(buf));
}

void rtl8187_write_phy(struct ieee80211_hw *dev, u8 addr, u32 data)
{
	struct rtl8187_priv *priv = dev->priv;

	data <<= 8;
	data |= addr | 0x80;

	rtl818x_iowrite8(priv, &priv->map->PHY[3], (data >> 24) & 0xFF);
	rtl818x_iowrite8(priv, &priv->map->PHY[2], (data >> 16) & 0xFF);
	rtl818x_iowrite8(priv, &priv->map->PHY[1], (data >> 8) & 0xFF);
	rtl818x_iowrite8(priv, &priv->map->PHY[0], data & 0xFF);

	msleep(1);
}

static void rtl8187_tx_cb(struct urb *urb)
{
	struct ieee80211_tx_status status = { {0} };
	struct sk_buff *skb = (struct sk_buff *)urb->context;
	struct rtl8187_tx_info *info = (struct rtl8187_tx_info *)skb->cb;

	usb_free_urb(info->urb);
	if (info->control)
		memcpy(&status.control, info->control, sizeof(status.control));
	kfree(info->control);
	skb_pull(skb, sizeof(struct rtl8187_tx_hdr));
	status.flags |= IEEE80211_TX_STATUS_ACK;
	ieee80211_tx_status_irqsafe(info->dev, skb, &status);
}

static int rtl8187_tx(struct ieee80211_hw *dev, struct sk_buff *skb,
		      struct ieee80211_tx_control *control)
{
	struct rtl8187_priv *priv = dev->priv;
	struct rtl8187_tx_hdr *hdr;
	struct rtl8187_tx_info *info;
	struct urb *urb;
	__le16 rts_dur = 0;
	u32 flags;

	urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!urb) {
		kfree_skb(skb);
		return 0;
	}

	flags = skb->len;
	flags |= RTL8187_TX_FLAG_NO_ENCRYPT;
	flags |= control->rts_cts_rate << 19;
	flags |= control->tx_rate << 24;
	if (ieee80211_get_morefrag((struct ieee80211_hdr *)skb->data))
		flags |= RTL8187_TX_FLAG_MORE_FRAG;
	if (control->flags & IEEE80211_TXCTL_USE_RTS_CTS) {
		flags |= RTL8187_TX_FLAG_RTS;
		rts_dur = ieee80211_rts_duration(dev, priv->if_id, skb->len, control);
	}
	if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
		flags |= RTL8187_TX_FLAG_CTS;

	hdr = (struct rtl8187_tx_hdr *)skb_push(skb, sizeof(*hdr));
	hdr->flags = cpu_to_le32(flags);
	hdr->len = 0;
	hdr->rts_duration = rts_dur;
	hdr->retry = cpu_to_le32(control->retry_limit << 8);

	info = (struct rtl8187_tx_info *)skb->cb;
	info->control = kmemdup(control, sizeof(*control), GFP_ATOMIC);
	info->urb = urb;
	info->dev = dev;
	usb_fill_bulk_urb(urb, priv->udev, usb_sndbulkpipe(priv->udev, 2),
			  hdr, skb->len, rtl8187_tx_cb, skb);
	usb_submit_urb(urb, GFP_ATOMIC);

	return 0;
}

static void rtl8187_rx_cb(struct urb *urb)
{
	struct sk_buff *skb = (struct sk_buff *)urb->context;
	struct rtl8187_rx_info *info = (struct rtl8187_rx_info *)skb->cb;
	struct ieee80211_hw *dev = info->dev;
	struct rtl8187_priv *priv = dev->priv;
	struct rtl8187_rx_hdr *hdr;
	struct ieee80211_rx_status rx_status = { 0 };
	int rate, signal;
	u32 flags;

	spin_lock(&priv->rx_queue.lock);
	if (skb->next)
		__skb_unlink(skb, &priv->rx_queue);
	else {
		spin_unlock(&priv->rx_queue.lock);
		return;
	}
	spin_unlock(&priv->rx_queue.lock);

	if (unlikely(urb->status)) {
		usb_free_urb(urb);
		dev_kfree_skb_irq(skb);
		return;
	}

	skb_put(skb, urb->actual_length);
	hdr = (struct rtl8187_rx_hdr *)(skb_tail_pointer(skb) - sizeof(*hdr));
	flags = le32_to_cpu(hdr->flags);
	skb_trim(skb, flags & 0x0FFF);

	signal = hdr->agc >> 1;
	rate = (flags >> 20) & 0xF;
	if (rate > 3) {	/* OFDM rate */
		if (signal > 90)
			signal = 90;
		else if (signal < 25)
			signal = 25;
		signal = 90 - signal;
	} else {	/* CCK rate */
		if (signal > 95)
			signal = 95;
		else if (signal < 30)
			signal = 30;
		signal = 95 - signal;
	}

	rx_status.antenna = (hdr->signal >> 7) & 1;
	rx_status.signal = 64 - min(hdr->noise, (u8)64);
	rx_status.ssi = signal;
	rx_status.rate = rate;
	rx_status.freq = dev->conf.freq;
	rx_status.channel = dev->conf.channel;
	rx_status.phymode = dev->conf.phymode;
	rx_status.mactime = le64_to_cpu(hdr->mac_time);
	if (flags & (1 << 13))
		rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
	ieee80211_rx_irqsafe(dev, skb, &rx_status);

	skb = dev_alloc_skb(RTL8187_MAX_RX);
	if (unlikely(!skb)) {
		usb_free_urb(urb);
		/* TODO check rx queue length and refill *somewhere* */
		return;
	}

	info = (struct rtl8187_rx_info *)skb->cb;
	info->urb = urb;
	info->dev = dev;
	urb->transfer_buffer = skb_tail_pointer(skb);
	urb->context = skb;
	skb_queue_tail(&priv->rx_queue, skb);

	usb_submit_urb(urb, GFP_ATOMIC);
}

static int rtl8187_init_urbs(struct ieee80211_hw *dev)
{
	struct rtl8187_priv *priv = dev->priv;
	struct urb *entry;
	struct sk_buff *skb;
	struct rtl8187_rx_info *info;

	while (skb_queue_len(&priv->rx_queue) < 8) {
		skb = __dev_alloc_skb(RTL8187_MAX_RX, GFP_KERNEL);
		if (!skb)
			break;
		entry = usb_alloc_urb(0, GFP_KERNEL);
		if (!entry) {
			kfree_skb(skb);
			break;
		}
		usb_fill_bulk_urb(entry, priv->udev,
				  usb_rcvbulkpipe(priv->udev, 1),
				  skb_tail_pointer(skb),
				  RTL8187_MAX_RX, rtl8187_rx_cb, skb);
		info = (struct rtl8187_rx_info *)skb->cb;
		info->urb = entry;
		info->dev = dev;
		skb_queue_tail(&priv->rx_queue, skb);
		usb_submit_urb(entry, GFP_KERNEL);
	}

	return 0;
}

static int rtl8187_init_hw(struct ieee80211_hw *dev)
{
	struct rtl8187_priv *priv = dev->priv;
	u8 reg;
	int i;

	/* reset */
	rtl818x_iowrite8(priv, &priv->map->EEPROM_CMD, RTL818X_EEPROM_CMD_CONFIG);
	reg = rtl818x_ioread8(priv, &priv->map->CONFIG3);
	rtl818x_iowrite8(priv, &priv->map->CONFIG3, reg | RTL818X_CONFIG3_ANAPARAM_WRITE);
	rtl818x_iowrite32(priv, &priv->map->ANAPARAM, RTL8225_ANAPARAM_ON);
	rtl818x_iowrite32(priv, &priv->map->ANAPARAM2, RTL8225_ANAPARAM2_ON);
	rtl818x_iowrite8(priv, &priv->map->CONFIG3, reg & ~RTL818X_CONFIG3_ANAPARAM_WRITE);
	rtl818x_iowrite8(priv, &priv->map->EEPROM_CMD, RTL818X_EEPROM_CMD_NORMAL);

	rtl818x_iowrite16(priv, &priv->map->INT_MASK, 0);

	msleep(200);
	rtl818x_iowrite8(priv, (u8 *)0xFE18, 0x10);
	rtl818x_iowrite8(priv, (u8 *)0xFE18, 0x11);
	rtl818x_iowrite8(priv, (u8 *)0xFE18, 0x00);
	msleep(200);

	reg = rtl818x_ioread8(priv, &priv->map->CMD);
	reg &= (1 << 1);
	reg |= RTL818X_CMD_RESET;
	rtl818x_iowrite8(priv, &priv->map->CMD, reg);

	i = 10;
	do {
		msleep(2);
		if (!(rtl818x_ioread8(priv, &priv->map->CMD) &
		      RTL818X_CMD_RESET))
			break;
	} while (--i);

	if (!i) {
		printk(KERN_ERR "%s: Reset timeout!\n", wiphy_name(dev->wiphy));
		return -ETIMEDOUT;
	}

	/* reload registers from eeprom */
	rtl818x_iowrite8(priv, &priv->map->EEPROM_CMD, RTL818X_EEPROM_CMD_LOAD);

	i = 10;
	do {
		msleep(4);
		if (!(rtl818x_ioread8(priv, &priv->map->EEPROM_CMD) &
		      RTL818X_EEPROM_CMD_CONFIG))
			break;
	} while (--i);

	if (!i) {
		printk(KERN_ERR "%s: eeprom reset timeout!\n",
		       wiphy_name(dev->wiphy));
		return -ETIMEDOUT;
	}

	rtl818x_iowrite8(priv, &priv->map->EEPROM_CMD, RTL818X_EEPROM_CMD_CONFIG);
	reg = rtl818x_ioread8(priv, &priv->map->CONFIG3);
	rtl818x_iowrite8(priv, &priv->map->CONFIG3, reg | RTL818X_CONFIG3_ANAPARAM_WRITE);
	rtl818x_iowrite32(priv, &priv->map->ANAPARAM, RTL8225_ANAPARAM_ON);
	rtl818x_iowrite32(priv, &priv->map->ANAPARAM2, RTL8225_ANAPARAM2_ON);
	rtl818x_iowrite8(priv, &priv->map->CONFIG3, reg & ~RTL818X_CONFIG3_ANAPARAM_WRITE);
	rtl818x_iowrite8(priv, &priv->map->EEPROM_CMD, RTL818X_EEPROM_CMD_NORMAL);

	/* setup card */
	rtl818x_iowrite16(priv, &priv->map->RFPinsSelect, 0);
	rtl818x_iowrite8(priv, &priv->map->GPIO, 0);

	rtl818x_iowrite16(priv, &priv->map->RFPinsSelect, (4 << 8));
	rtl818x_iowrite8(priv, &priv->map->GPIO, 1);
	rtl818x_iowrite8(priv, &priv->map->GP_ENABLE, 0);

	rtl818x_iowrite8(priv, &priv->map->EEPROM_CMD, RTL818X_EEPROM_CMD_CONFIG);

	rtl818x_iowrite16(priv, (__le16 *)0xFFF4, 0xFFFF);
	reg = rtl818x_ioread8(priv, &priv->map->CONFIG1);
	reg &= 0x3F;
	reg |= 0x80;
	rtl818x_iowrite8(priv, &priv->map->CONFIG1, reg);

	rtl818x_iowrite8(priv, &priv->map->EEPROM_CMD, RTL818X_EEPROM_CMD_NORMAL);

	rtl818x_iowrite32(priv, &priv->map->INT_TIMEOUT, 0);
	rtl818x_iowrite8(priv, &priv->map->WPA_CONF, 0);
	rtl818x_iowrite8(priv, &priv->map->RATE_FALLBACK, 0x81);

	// TODO: set RESP_RATE and BRSR properly
	rtl818x_iowrite8(priv, &priv->map->RESP_RATE, (8 << 4) | 0);
	rtl818x_iowrite16(priv, &priv->map->BRSR, 0x01F3);

	/* host_usb_init */
	rtl818x_iowrite16(priv, &priv->map->RFPinsSelect, 0);
	rtl818x_iowrite8(priv, &priv->map->GPIO, 0);
	reg = rtl818x_ioread8(priv, (u8 *)0xFE53);
	rtl818x_iowrite8(priv, (u8 *)0xFE53, reg | (1 << 7));
	rtl818x_iowrite16(priv, &priv->map->RFPinsSelect, (4 << 8));
	rtl818x_iowrite8(priv, &priv->map->GPIO, 0x20);
	rtl818x_iowrite8(priv, &priv->map->GP_ENABLE, 0);
	rtl818x_iowrite16(priv, &priv->map->RFPinsOutput, 0x80);
	rtl818x_iowrite16(priv, &priv->map->RFPinsSelect, 0x80);
	rtl818x_iowrite16(priv, &priv->map->RFPinsEnable, 0x80);
	msleep(100);

	rtl818x_iowrite32(priv, &priv->map->RF_TIMING, 0x000a8008);
	rtl818x_iowrite16(priv, &priv->map->BRSR, 0xFFFF);
	rtl818x_iowrite32(priv, &priv->map->RF_PARA, 0x00100044);
	rtl818x_iowrite8(priv, &priv->map->EEPROM_CMD, RTL818X_EEPROM_CMD_CONFIG);
	rtl818x_iowrite8(priv, &priv->map->CONFIG3, 0x44);
	rtl818x_iowrite8(priv, &priv->map->EEPROM_CMD, RTL818X_EEPROM_CMD_NORMAL);
	rtl818x_iowrite16(priv, &priv->map->RFPinsEnable, 0x1FF7);
	msleep(100);

	priv->rf_init(dev);

	rtl818x_iowrite16(priv, &priv->map->BRSR, 0x01F3);
	reg = rtl818x_ioread16(priv, &priv->map->PGSELECT) & 0xfffe;
	rtl818x_iowrite16(priv, &priv->map->PGSELECT, reg | 0x1);
	rtl818x_iowrite16(priv, (__le16 *)0xFFFE, 0x10);
	rtl818x_iowrite8(priv, &priv->map->TALLY_SEL, 0x80);
	rtl818x_iowrite8(priv, (u8 *)0xFFFF, 0x60);
	rtl818x_iowrite16(priv, &priv->map->PGSELECT, reg);

	return 0;
}

static void rtl8187_set_channel(struct ieee80211_hw *dev, int channel)
{
	u32 reg;
	struct rtl8187_priv *priv = dev->priv;

	reg = rtl818x_ioread32(priv, &priv->map->TX_CONF);
	/* Enable TX loopback on MAC level to avoid TX during channel