drivers/net/wireless/zydas/zd1211rw/zd_usb.h

   1 /* ZD1211 USB-WLAN driver for Linux
   2  *
   3  * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
   4  * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef _ZD_USB_H
  21 #define _ZD_USB_H
  22
  23 #include <linux/completion.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/usb.h>
  28
  29 #include "zd_def.h"
  30
  31 #define ZD_USB_TX_HIGH  5
  32 #define ZD_USB_TX_LOW   2
  33
  34 #define ZD_TX_TIMEOUT           (HZ * 5)
  35 #define ZD_TX_WATCHDOG_INTERVAL round_jiffies_relative(HZ)
  36 #define ZD_RX_IDLE_INTERVAL     round_jiffies_relative(30 * HZ)
  37
  38 enum devicetype {
  39         DEVICE_ZD1211  = 0,
  40         DEVICE_ZD1211B = 1,
  41         DEVICE_INSTALLER = 2,
  42 };
  43
  44 enum endpoints {
  45         EP_CTRL     = 0,
  46         EP_DATA_OUT = 1,
  47         EP_DATA_IN  = 2,
  48         EP_INT_IN   = 3,
  49         EP_REGS_OUT = 4,
  50 };
  51
  52 enum {
  53         USB_MAX_TRANSFER_SIZE           = 4096, /* bytes */
  54         /* FIXME: The original driver uses this value. We have to check,
  55          * whether the MAX_TRANSFER_SIZE is sufficient and this needs only be
  56          * used if one combined frame is split over two USB transactions.
  57          */
  58         USB_MAX_RX_SIZE                 = 4800, /* bytes */
  59         USB_MAX_IOWRITE16_COUNT         = 15,
  60         USB_MAX_IOWRITE32_COUNT         = USB_MAX_IOWRITE16_COUNT/2,
  61         USB_MAX_IOREAD16_COUNT          = 15,
  62         USB_MAX_IOREAD32_COUNT          = USB_MAX_IOREAD16_COUNT/2,
  63         USB_MIN_RFWRITE_BIT_COUNT       = 16,
  64         USB_MAX_RFWRITE_BIT_COUNT       = 28,
  65         USB_MAX_EP_INT_BUFFER           = 64,
  66         USB_ZD1211B_BCD_DEVICE          = 0x4810,
  67 };
  68
  69 enum control_requests {
  70         USB_REQ_WRITE_REGS              = 0x21,
  71         USB_REQ_READ_REGS               = 0x22,
  72         USB_REQ_WRITE_RF                = 0x23,
  73         USB_REQ_PROG_FLASH              = 0x24,
  74         USB_REQ_EEPROM_START            = 0x0128, /* ? request is a byte */
  75         USB_REQ_EEPROM_MID              = 0x28,
  76         USB_REQ_EEPROM_END              = 0x0228, /* ? request is a byte */
  77         USB_REQ_FIRMWARE_DOWNLOAD       = 0x30,
  78         USB_REQ_FIRMWARE_CONFIRM        = 0x31,
  79         USB_REQ_FIRMWARE_READ_DATA      = 0x32,
  80 };
  81
  82 struct usb_req_read_regs {
  83         __le16 id;
  84         __le16 addr[0];
  85 } __packed;
  86
  87 struct reg_data {
  88         __le16 addr;
  89         __le16 value;
  90 } __packed;
  91
  92 struct usb_req_write_regs {
  93         __le16 id;
  94         struct reg_data reg_writes[0];
  95 } __packed;
  96
  97 enum {
  98         RF_IF_LE = 0x02,
  99         RF_CLK   = 0x04,
 100         RF_DATA  = 0x08,
 101 };
 102
 103 struct usb_req_rfwrite {
 104         __le16 id;
 105         __le16 value;
 106         /* 1: 3683a */
 107         /* 2: other (default) */
 108         __le16 bits;
 109         /* RF2595: 24 */
 110         __le16 bit_values[0];
 111         /* (ZD_CR203 & ~(RF_IF_LE | RF_CLK | RF_DATA)) | (bit ? RF_DATA : 0) */
 112 } __packed;
 113
 114 /* USB interrupt */
 115
 116 enum usb_int_id {
 117         USB_INT_TYPE                    = 0x01,
 118         USB_INT_ID_REGS                 = 0x90,
 119         USB_INT_ID_RETRY_FAILED         = 0xa0,
 120 };
 121
 122 enum usb_int_flags {
 123         USB_INT_READ_REGS_EN            = 0x01,
 124 };
 125
 126 struct usb_int_header {
 127         u8 type;        /* must always be 1 */
 128         u8 id;
 129 } __packed;
 130
 131 struct usb_int_regs {
 132         struct usb_int_header hdr;
 133         struct reg_data regs[0];
 134 } __packed;
 135
 136 struct usb_int_retry_fail {
 137         struct usb_int_header hdr;
 138         u8 new_rate;
 139         u8 _dummy;
 140         u8 addr[ETH_ALEN];
 141         u8 ibss_wakeup_dest;
 142 } __packed;
 143
 144 struct read_regs_int {
 145         struct completion completion;
 146         struct usb_req_read_regs *req;
 147         unsigned int req_count;
 148         /* Stores the USB int structure and contains the USB address of the
 149          * first requested register before request.
 150          */
 151         u8 buffer[USB_MAX_EP_INT_BUFFER];
 152         int length;
 153         __le16 cr_int_addr;
 154 };
 155
 156 struct zd_ioreq16 {
 157         zd_addr_t addr;
 158         u16 value;
 159 };
 160
 161 struct zd_ioreq32 {
 162         zd_addr_t addr;
 163         u32 value;
 164 };
 165
 166 struct zd_usb_interrupt {
 167         struct read_regs_int read_regs;
 168         spinlock_t lock;
 169         struct urb *urb;
 170         void *buffer;
 171         dma_addr_t buffer_dma;
 172         int interval;
 173         atomic_t read_regs_enabled;
 174         u8 read_regs_int_overridden:1;
 175 };
 176
 177 static inline struct usb_int_regs *get_read_regs(struct zd_usb_interrupt *intr)
 178 {
 179         return (struct usb_int_regs *)intr->read_regs.buffer;
 180 }
 181
 182 #define RX_URBS_COUNT 5
 183
 184 struct zd_usb_rx {
 185         spinlock_t lock;
 186         struct mutex setup_mutex;
 187         struct delayed_work idle_work;
 188         struct tasklet_struct reset_timer_tasklet;
 189         u8 fragment[2 * USB_MAX_RX_SIZE];
 190         unsigned int fragment_length;
 191         unsigned int usb_packet_size;
 192         struct urb **urbs;
 193         int urbs_count;
 194 };
 195
 196 /**
 197  * struct zd_usb_tx - structure used for transmitting frames
 198  * @enabled: atomic enabled flag, indicates whether tx is enabled
 199  * @lock: lock for transmission
 200  * @submitted: anchor for URBs sent to device
 201  * @submitted_urbs: atomic integer that counts the URBs having sent to the
 202  *      device, which haven't been completed
 203  * @stopped: indicates whether higher level tx queues are stopped
 204  */
 205 struct zd_usb_tx {
 206         atomic_t enabled;
 207         spinlock_t lock;
 208         struct delayed_work watchdog_work;
 209         struct sk_buff_head submitted_skbs;
 210         struct usb_anchor submitted;
 211         int submitted_urbs;
 212         u8 stopped:1, watchdog_enabled:1;
 213 };
 214
 215 /* Contains the usb parts. The structure doesn't require a lock because intf
 216  * will not be changed after initialization.
 217  */
 218 struct zd_usb {
 219         struct zd_usb_interrupt intr;
 220         struct zd_usb_rx rx;
 221         struct zd_usb_tx tx;
 222         struct usb_interface *intf;
 223         struct usb_anchor submitted_cmds;
 224         struct urb *urb_async_waiting;
 225         int cmd_error;
 226         u8 req_buf[64]; /* zd_usb_iowrite16v needs 62 bytes */
 227         u8 is_zd1211b:1, initialized:1, was_running:1, in_async:1;
 228 };
 229
 230 #define zd_usb_dev(usb) (&usb->intf->dev)
 231
 232 static inline struct usb_device *zd_usb_to_usbdev(struct zd_usb *usb)
 233 {
 234         return interface_to_usbdev(usb->intf);
 235 }
 236
 237 static inline struct ieee80211_hw *zd_intf_to_hw(struct usb_interface *intf)
 238 {
 239         return usb_get_intfdata(intf);
 240 }
 241
 242 static inline struct ieee80211_hw *zd_usb_to_hw(struct zd_usb *usb)
 243 {
 244         return zd_intf_to_hw(usb->intf);
 245 }
 246
 247 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
 248                  struct usb_interface *intf);
 249 int zd_usb_init_hw(struct zd_usb *usb);
 250 void zd_usb_clear(struct zd_usb *usb);
 251
 252 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size);
 253
 254 void zd_tx_watchdog_enable(struct zd_usb *usb);
 255 void zd_tx_watchdog_disable(struct zd_usb *usb);
 256
 257 int zd_usb_enable_int(struct zd_usb *usb);
 258 void zd_usb_disable_int(struct zd_usb *usb);
 259
 260 int zd_usb_enable_rx(struct zd_usb *usb);
 261 void zd_usb_disable_rx(struct zd_usb *usb);
 262
 263 void zd_usb_reset_rx_idle_timer(struct zd_usb *usb);
 264
 265 void zd_usb_enable_tx(struct zd_usb *usb);
 266 void zd_usb_disable_tx(struct zd_usb *usb);
 267
 268 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb);
 269
 270 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
 271                  const zd_addr_t *addresses, unsigned int count);
 272
 273 static inline int zd_usb_ioread16(struct zd_usb *usb, u16 *value,
 274                               const zd_addr_t addr)
 275 {
 276         return zd_usb_ioread16v(usb, value, &addr, 1);
 277 }
 278
 279 void zd_usb_iowrite16v_async_start(struct zd_usb *usb);
 280 int zd_usb_iowrite16v_async_end(struct zd_usb *usb, unsigned int timeout);
 281 int zd_usb_iowrite16v_async(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
 282                             unsigned int count);
 283 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
 284                       unsigned int count);
 285
 286 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits);
 287
 288 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len);
 289
 290 extern struct workqueue_struct *zd_workqueue;
 291
 292 #endif /* _ZD_USB_H */