1 files changed, 519 insertions, 0 deletions

diff --git a/drivers/net/wireless/prism54/islpci_eth.c b/drivers/net/wireless/prism54/islpci_eth.c
new file mode 100644
index 000000000000..5952e9960499
--- /dev/null
+++ b/drivers/net/wireless/prism54/islpci_eth.c
@@ -0,0 +1,519 @@
+/*
+ *  
+ *  Copyright (C) 2002 Intersil Americas Inc.
+ *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
+ *  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
+ *
+ *  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
+ *
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+
+#include "prismcompat.h"
+#include "isl_38xx.h"
+#include "islpci_eth.h"
+#include "islpci_mgt.h"
+#include "oid_mgt.h"
+
+/******************************************************************************
+    Network Interface functions
+******************************************************************************/
+void
+islpci_eth_cleanup_transmit(islpci_private *priv,
+                            isl38xx_control_block *control_block)
+{
+        struct sk_buff *skb;
+        u32 index;
+
+        /* compare the control block read pointer with the free pointer */
+        while (priv->free_data_tx !=
+               le32_to_cpu(control_block->
+                           device_curr_frag[ISL38XX_CB_TX_DATA_LQ])) {
+                /* read the index of the first fragment to be freed */
+                index = priv->free_data_tx % ISL38XX_CB_TX_QSIZE;
+
+                /* check for holes in the arrays caused by multi fragment frames 
+                 * searching for the last fragment of a frame */
+                if (priv->pci_map_tx_address[index] != (dma_addr_t) NULL) {
+                        /* entry is the last fragment of a frame
+                         * free the skb structure and unmap pci memory */
+                        skb = priv->data_low_tx[index];
+
+#if VERBOSE > SHOW_ERROR_MESSAGES
+                        DEBUG(SHOW_TRACING,
+                              "cleanup skb %p skb->data %p skb->len %u truesize %u\n ",
+                              skb, skb->data, skb->len, skb->truesize);
+#endif
+
+                        pci_unmap_single(priv->pdev,
+                                         priv->pci_map_tx_address[index],
+                                         skb->len, PCI_DMA_TODEVICE);
+                        dev_kfree_skb_irq(skb);
+                        skb = NULL;
+                }
+                /* increment the free data low queue pointer */
+                priv->free_data_tx++;
+        }
+}
+
+int
+islpci_eth_transmit(struct sk_buff *skb, struct net_device *ndev)
+{
+        islpci_private *priv = netdev_priv(ndev);
+        isl38xx_control_block *cb = priv->control_block;
+        u32 index;
+        dma_addr_t pci_map_address;
+        int frame_size;
+        isl38xx_fragment *fragment;
+        int offset;
+        struct sk_buff *newskb;
+        int newskb_offset;
+        unsigned long flags;
+        unsigned char wds_mac[6];
+        u32 curr_frag;
+        int err = 0;
+
+#if VERBOSE > SHOW_ERROR_MESSAGES
+        DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_transmit \n");
+#endif
+
+        /* lock the driver code */
+        spin_lock_irqsave(&priv->slock, flags);
+
+        /* determine the amount of fragments needed to store the frame */
+
+        frame_size = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
+        if (init_wds)
+                frame_size += 6;
+
+        /* check whether the destination queue has enough fragments for the frame */
+        curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ]);
+        if (unlikely(curr_frag - priv->free_data_tx >= ISL38XX_CB_TX_QSIZE)) {
+                printk(KERN_ERR "%s: transmit device queue full when awake\n",
+                       ndev->name);
+                netif_stop_queue(ndev);
+
+                /* trigger the device */
+                isl38xx_w32_flush(priv->device_base, ISL38XX_DEV_INT_UPDATE,
+                                  ISL38XX_DEV_INT_REG);
+                udelay(ISL38XX_WRITEIO_DELAY);
+
+                err = -EBUSY;
+                goto drop_free;
+        }
+        /* Check alignment and WDS frame formatting. The start of the packet should
+         * be aligned on a 4-byte boundary. If WDS is enabled add another 6 bytes
+         * and add WDS address information */
+        if (likely(((long) skb->data & 0x03) | init_wds)) {
+                /* get the number of bytes to add and re-allign */
+                offset = (4 - (long) skb->data) & 0x03;
+                offset += init_wds ? 6 : 0;
+
+                /* check whether the current skb can be used  */
+                if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
+                        unsigned char *src = skb->data;
+
+#if VERBOSE > SHOW_ERROR_MESSAGES
+                        DEBUG(SHOW_TRACING, "skb offset %i wds %i\n", offset,
+                              init_wds);
+#endif
+
+                        /* align the buffer on 4-byte boundary */
+                        skb_reserve(skb, (4 - (long) skb->data) & 0x03);
+                        if (init_wds) {
+                                /* wds requires an additional address field of 6 bytes */
+                                skb_put(skb, 6);
+#ifdef ISLPCI_ETH_DEBUG
+                                printk("islpci_eth_transmit:wds_mac\n");
+#endif
+                                memmove(skb->data + 6, src, skb->len);
+                                memcpy(skb->data, wds_mac, 6);
+                        } else {
+                                memmove(skb->data, src, skb->len);
+                        }
+
+#if VERBOSE > SHOW_ERROR_MESSAGES
+                        DEBUG(SHOW_TRACING, "memmove %p %p %i \n", skb->data,
+                              src, skb->len);
+#endif
+                } else {
+                        newskb =
+                            dev_alloc_skb(init_wds ? skb->len + 6 : skb->len);
+                        if (unlikely(newskb == NULL)) {
+                                printk(KERN_ERR "%s: Cannot allocate skb\n",
+                                       ndev->name);
+                                err = -ENOMEM;
+                                goto drop_free;
+                        }
+                        newskb_offset = (4 - (long) newskb->data) & 0x03;
+
+                        /* Check if newskb->data is aligned */
+                        if (newskb_offset)
+                                skb_reserve(newskb, newskb_offset);
+
+                        skb_put(newskb, init_wds ? skb->len + 6 : skb->len);
+                        if (init_wds) {
+                                memcpy(newskb->data + 6, skb->data, skb->len);
+                                memcpy(newskb->data, wds_mac, 6);
+#ifdef ISLPCI_ETH_DEBUG
+                                printk("islpci_eth_transmit:wds_mac\n");
+#endif
+                        } else
+                                memcpy(newskb->data, skb->data, skb->len);
+
+#if VERBOSE > SHOW_ERROR_MESSAGES
+                        DEBUG(SHOW_TRACING, "memcpy %p %p %i wds %i\n",
+                              newskb->data, skb->data, skb->len, init_wds);
+#endif
+
+                        newskb->dev = skb->dev;
+                        dev_kfree_skb(skb);
+                        skb = newskb;
+                }
+        }
+        /* display the buffer contents for debugging */
+#if VERBOSE > SHOW_ERROR_MESSAGES
+        DEBUG(SHOW_BUFFER_CONTENTS, "\ntx %p ", skb->data);
+        display_buffer((char *) skb->data, skb->len);
+#endif
+
+        /* map the skb buffer to pci memory for DMA operation */
+        pci_map_address = pci_map_single(priv->pdev,
+                                         (void *) skb->data, skb->len,
+                                         PCI_DMA_TODEVICE);
+        if (unlikely(pci_map_address == 0)) {
+                printk(KERN_WARNING "%s: cannot map buffer to PCI\n",
+                       ndev->name);
+
+                err = -EIO;
+                goto drop_free;
+        }
+        /* Place the fragment in the control block structure. */
+        index = curr_frag % ISL38XX_CB_TX_QSIZE;
+        fragment = &cb->tx_data_low[index];
+
+        priv->pci_map_tx_address[index] = pci_map_address;
+        /* store the skb address for future freeing  */
+        priv->data_low_tx[index] = skb;
+        /* set the proper fragment start address and size information */
+        fragment->size = cpu_to_le16(frame_size);
+        fragment->flags = cpu_to_le16(0);       /* set to 1 if more fragments */
+        fragment->address = cpu_to_le32(pci_map_address);
+        curr_frag++;
+
+        /* The fragment address in the control block must have been
+         * written before announcing the frame buffer to device. */
+        wmb();
+        cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag);
+
+        if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD
+            > ISL38XX_CB_TX_QSIZE) {
+                /* stop sends from upper layers */
+                netif_stop_queue(ndev);
+
+                /* set the full flag for the transmission queue */
+                priv->data_low_tx_full = 1;
+        }
+
+        /* trigger the device */
+        islpci_trigger(priv);
+
+        /* unlock the driver code */
+        spin_unlock_irqrestore(&priv->slock, flags);
+
+        /* set the transmission time */
+        ndev->trans_start = jiffies;
+        priv->statistics.tx_packets++;
+        priv->statistics.tx_bytes += skb->len;
+
+        return 0;
+
+      drop_free:
+        /* free the skbuf structure before aborting */
+        dev_kfree_skb(skb);
+        skb = NULL;
+
+        priv->statistics.tx_dropped++;
+        spin_unlock_irqrestore(&priv->slock, flags);
+        return err;
+}
+
+static inline int
+islpci_monitor_rx(islpci_private *priv, struct sk_buff **skb)
+{
+        /* The card reports full 802.11 packets but with a 20 bytes
+         * header and without the FCS. But there a is a bit that
+         * indicates if the packet is corrupted :-) */
+        struct rfmon_header *hdr = (struct rfmon_header *) (*skb)->data;
+        if (hdr->flags & 0x01)
+                /* This one is bad. Drop it ! */
+                return -1;
+        if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) {
+                struct avs_80211_1_header *avs;
+                /* extract the relevant data from the header */
+                u32 clock = le32_to_cpu(hdr->clock);
+                u8 rate = hdr->rate;
+                u16 freq = le16_to_cpu(hdr->freq);
+                u8 rssi = hdr->rssi;
+
+                skb_pull(*skb, sizeof (struct rfmon_header));
+
+                if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) {
+                        struct sk_buff *newskb = skb_copy_expand(*skb,
+                                                                 sizeof (struct
+                                                                         avs_80211_1_header),
+                                                                 0, GFP_ATOMIC);
+                        if (newskb) {
+                                dev_kfree_skb_irq(*skb);
+                                *skb = newskb;
+                        } else
+                                return -1;
+                        /* This behavior is not very subtile... */
+                }
+
+                /* make room for the new header and fill it. */
+                avs =
+                    (struct avs_80211_1_header *) skb_push(*skb,
+                                                           sizeof (struct
+                                                                   avs_80211_1_header));
+                
+                avs->version = cpu_to_be32(P80211CAPTURE_VERSION);
+                avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header));
+                avs->mactime = cpu_to_be64(le64_to_cpu(clock));
+                avs->hosttime = cpu_to_be64(jiffies);
+                avs->phytype = cpu_to_be32(6);  /*OFDM: 6 for (g), 8 for (a) */
+                avs->channel = cpu_to_be32(channel_of_freq(freq));
+                avs->datarate = cpu_to_be32(rate * 5);
+                avs->antenna = cpu_to_be32(0);  /*unknown */
+                avs->priority = cpu_to_be32(0); /*unknown */
+                avs->ssi_type = cpu_to_be32(3); /*2: dBm, 3: raw RSSI */
+                avs->ssi_signal = cpu_to_be32(rssi & 0x7f);
+                avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise);      /*better than 'undefined', I assume */
+                avs->preamble = cpu_to_be32(0); /*unknown */
+                avs->encoding = cpu_to_be32(0); /*unknown */
+        } else
+                skb_pull(*skb, sizeof (struct rfmon_header));
+
+        (*skb)->protocol = htons(ETH_P_802_2);
+        (*skb)->mac.raw = (*skb)->data;
+        (*skb)->pkt_type = PACKET_OTHERHOST;
+
+        return 0;
+}
+
+int
+islpci_eth_receive(islpci_private *priv)
+{
+        struct net_device *ndev = priv->ndev;
+        isl38xx_control_block *control_block = priv->control_block;
+        struct sk_buff *skb;
+        u16 size;
+        u32 index, offset;
+        unsigned char *src;
+        int discard = 0;
+
+#if VERBOSE > SHOW_ERROR_MESSAGES
+        DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive \n");
+#endif
+
+        /* the device has written an Ethernet frame in the data area
+         * of the sk_buff without updating the structure, do it now */
+        index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE;
+        size = le16_to_cpu(control_block->rx_data_low[index].size);
+        skb = priv->data_low_rx[index];
+        offset = ((unsigned long)
+                  le32_to_cpu(control_block->rx_data_low[index].address) -
+                  (unsigned long) skb->data) & 3;
+
+#if VERBOSE > SHOW_ERROR_MESSAGES
+        DEBUG(SHOW_TRACING,
+              "frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n ",
+              control_block->rx_data_low[priv->free_data_rx].address, skb->data,
+              skb->len, offset, skb->truesize);
+#endif
+
+        /* delete the streaming DMA mapping before processing the skb */
+        pci_unmap_single(priv->pdev,
+                         priv->pci_map_rx_address[index],
+                         MAX_FRAGMENT_SIZE_RX + 2, PCI_DMA_FROMDEVICE);
+
+        /* update the skb structure and allign the buffer */
+        skb_put(skb, size);
+        if (offset) {
+                /* shift the buffer allocation offset bytes to get the right frame */
+                skb_pull(skb, 2);
+                skb_put(skb, 2);
+        }
+#if VERBOSE > SHOW_ERROR_MESSAGES
+        /* display the buffer contents for debugging */
+        DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
+        display_buffer((char *) skb->data, skb->len);
+#endif
+
+        /* check whether WDS is enabled and whether the data frame is a WDS frame */
+
+        if (init_wds) {
+                /* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
+                src = skb->data + 6;
+                memmove(skb->data, src, skb->len - 6);
+                skb_trim(skb, skb->len - 6);
+        }
+#if VERBOSE > SHOW_ERROR_MESSAGES
+        DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb);
+        DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len);
+
+        /* display the buffer contents for debugging */
+        DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
+        display_buffer((char *) skb->data, skb->len);
+#endif
+
+        /* do some additional sk_buff and network layer parameters */
+        skb->dev = ndev;
+
+        /* take care of monitor mode and spy monitoring. */
+        if (unlikely(priv->iw_mode == IW_MODE_MONITOR))
+                discard = islpci_monitor_rx(priv, &skb);
+        else {
+                if (unlikely(skb->data[2 * ETH_ALEN] == 0)) {
+                        /* The packet has a rx_annex. Read it for spy monitoring, Then
+                         * remove it, while keeping the 2 leading MAC addr.
+                         */
+                        struct iw_quality wstats;
+                        struct rx_annex_header *annex =
+                            (struct rx_annex_header *) skb->data;
+                        wstats.level = annex->rfmon.rssi;
+                        /* The noise value can be a bit outdated if nobody's 
+                         * reading wireless stats... */
+                        wstats.noise = priv->local_iwstatistics.qual.noise;
+                        wstats.qual = wstats.level - wstats.noise;
+                        wstats.updated = 0x07;
+                        /* Update spy records */
+                        wireless_spy_update(ndev, annex->addr2, &wstats);
+
+                        memcpy(skb->data + sizeof (struct rfmon_header),
+                               skb->data, 2 * ETH_ALEN);
+                        skb_pull(skb, sizeof (struct rfmon_header));
+                }
+                skb->protocol = eth_type_trans(skb, ndev);
+        }
+        skb->ip_summed = CHECKSUM_NONE;
+        priv->statistics.rx_packets++;
+        priv->statistics.rx_bytes += size;
+
+        /* deliver the skb to the network layer */
+#ifdef ISLPCI_ETH_DEBUG
+        printk
+            ("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
+             skb->data[0], skb->data[1], skb->data[2], skb->data[3],
+             skb->data[4], skb->data[5]);
+#endif
+        if (unlikely(discard)) {
+                dev_kfree_skb_irq(skb);
+                skb = NULL;
+        } else
+                netif_rx(skb);
+
+        /* increment the read index for the rx data low queue */
+        priv->free_data_rx++;
+
+        /* add one or more sk_buff structures */
+        while (index =
+               le32_to_cpu(control_block->
+                           driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]),
+               index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) {
+                /* allocate an sk_buff for received data frames storage
+                 * include any required allignment operations */
+                skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2);
+                if (unlikely(skb == NULL)) {
+                        /* error allocating an sk_buff structure elements */
+                        DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb \n");
+                        break;
+                }
+                skb_reserve(skb, (4 - (long) skb->data) & 0x03);
+                /* store the new skb structure pointer */
+                index = index % ISL38XX_CB_RX_QSIZE;
+                priv->data_low_rx[index] = skb;
+
+#if VERBOSE > SHOW_ERROR_MESSAGES
+                DEBUG(SHOW_TRACING,
+                      "new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n ",
+                      skb, skb->data, skb->len, index, skb->truesize);
+#endif
+
+                /* set the streaming DMA mapping for proper PCI bus operation */
+                priv->pci_map_rx_address[index] =
+                    pci_map_single(priv->pdev, (void *) skb->data,
+                                   MAX_FRAGMENT_SIZE_RX + 2,
+                                   PCI_DMA_FROMDEVICE);
+                if (unlikely(priv->pci_map_rx_address[index] == (dma_addr_t) NULL)) {
+                        /* error mapping the buffer to device accessable memory address */
+                        DEBUG(SHOW_ERROR_MESSAGES,
+                              "Error mapping DMA address\n");
+
+                        /* free the skbuf structure before aborting */
+                        dev_kfree_skb_irq((struct sk_buff *) skb);
+                        skb = NULL;
+                        break;
+                }
+                /* update the fragment address */
+                control_block->rx_data_low[index].address = cpu_to_le32((u32)
+                                                                        priv->
+                                                                        pci_map_rx_address
+                                                                        [index]);
+                wmb();
+
+                /* increment the driver read pointer */
+                add_le32p((u32 *) &control_block->
+                          driver_curr_frag[ISL38XX_CB_RX_DATA_LQ], 1);
+        }
+
+        /* trigger the device */
+        islpci_trigger(priv);
+
+        return 0;
+}
+
+void
+islpci_do_reset_and_wake(void *data)
+{
+        islpci_private *priv = (islpci_private *) data;
+        islpci_reset(priv, 1);
+        netif_wake_queue(priv->ndev);
+        priv->reset_task_pending = 0;
+}
+
+void
+islpci_eth_tx_timeout(struct net_device *ndev)
+{
+        islpci_private *priv = netdev_priv(ndev);
+        struct net_device_stats *statistics = &priv->statistics;
+
+        /* increment the transmit error counter */
+        statistics->tx_errors++;
+
+        printk(KERN_WARNING "%s: tx_timeout", ndev->name);
+        if (!priv->reset_task_pending) {
+                priv->reset_task_pending = 1;
+                printk(", scheduling a reset");
+                netif_stop_queue(ndev);
+                schedule_work(&priv->reset_task);
+        }
+        printk("\n");
+}