Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $Id: cosa.c,v 1.31 2000/03/08 17:47:16 kas Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (C) 1995-1997 Jan "Yenya" Kasprzak <kas@fi.muni.cz> |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 5 | * Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 20 | */ |
| 21 | |
| 22 | /* |
| 23 | * The driver for the SRP and COSA synchronous serial cards. |
| 24 | * |
| 25 | * HARDWARE INFO |
| 26 | * |
| 27 | * Both cards are developed at the Institute of Computer Science, |
| 28 | * Masaryk University (http://www.ics.muni.cz/). The hardware is |
| 29 | * developed by Jiri Novotny <novotny@ics.muni.cz>. More information |
| 30 | * and the photo of both cards is available at |
| 31 | * http://www.pavoucek.cz/cosa.html. The card documentation, firmwares |
| 32 | * and other goods can be downloaded from ftp://ftp.ics.muni.cz/pub/cosa/. |
| 33 | * For Linux-specific utilities, see below in the "Software info" section. |
| 34 | * If you want to order the card, contact Jiri Novotny. |
| 35 | * |
| 36 | * The SRP (serial port?, the Czech word "srp" means "sickle") card |
| 37 | * is a 2-port intelligent (with its own 8-bit CPU) synchronous serial card |
| 38 | * with V.24 interfaces up to 80kb/s each. |
| 39 | * |
| 40 | * The COSA (communication serial adapter?, the Czech word "kosa" means |
| 41 | * "scythe") is a next-generation sync/async board with two interfaces |
| 42 | * - currently any of V.24, X.21, V.35 and V.36 can be selected. |
| 43 | * It has a 16-bit SAB80166 CPU and can do up to 10 Mb/s per channel. |
| 44 | * The 8-channels version is in development. |
| 45 | * |
| 46 | * Both types have downloadable firmware and communicate via ISA DMA. |
| 47 | * COSA can be also a bus-mastering device. |
| 48 | * |
| 49 | * SOFTWARE INFO |
| 50 | * |
| 51 | * The homepage of the Linux driver is at http://www.fi.muni.cz/~kas/cosa/. |
| 52 | * The CVS tree of Linux driver can be viewed there, as well as the |
| 53 | * firmware binaries and user-space utilities for downloading the firmware |
| 54 | * into the card and setting up the card. |
| 55 | * |
| 56 | * The Linux driver (unlike the present *BSD drivers :-) can work even |
| 57 | * for the COSA and SRP in one computer and allows each channel to work |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 58 | * in one of the two modes (character or network device). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | * |
| 60 | * AUTHOR |
| 61 | * |
| 62 | * The Linux driver was written by Jan "Yenya" Kasprzak <kas@fi.muni.cz>. |
| 63 | * |
| 64 | * You can mail me bugfixes and even success reports. I am especially |
| 65 | * interested in the SMP and/or muliti-channel success/failure reports |
| 66 | * (I wonder if I did the locking properly :-). |
| 67 | * |
| 68 | * THE AUTHOR USED THE FOLLOWING SOURCES WHEN PROGRAMMING THE DRIVER |
| 69 | * |
| 70 | * The COSA/SRP NetBSD driver by Zdenek Salvet and Ivos Cernohlavek |
| 71 | * The skeleton.c by Donald Becker |
| 72 | * The SDL Riscom/N2 driver by Mike Natale |
| 73 | * The Comtrol Hostess SV11 driver by Alan Cox |
| 74 | * The Sync PPP/Cisco HDLC layer (syncppp.c) ported to Linux by Alan Cox |
| 75 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | #include <linux/module.h> |
| 78 | #include <linux/kernel.h> |
| 79 | #include <linux/slab.h> |
| 80 | #include <linux/poll.h> |
| 81 | #include <linux/fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | #include <linux/interrupt.h> |
| 83 | #include <linux/delay.h> |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 84 | #include <linux/hdlc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | #include <linux/errno.h> |
| 86 | #include <linux/ioport.h> |
| 87 | #include <linux/netdevice.h> |
| 88 | #include <linux/spinlock.h> |
Matthias Kaehlcke | 6387c4b | 2008-03-05 18:53:01 -0800 | [diff] [blame] | 89 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | #include <linux/device.h> |
Jonathan Corbet | 0911810 | 2008-05-15 09:21:33 -0600 | [diff] [blame] | 91 | #include <linux/smp_lock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | #include <asm/io.h> |
| 93 | #include <asm/dma.h> |
| 94 | #include <asm/byteorder.h> |
| 95 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 96 | #undef COSA_SLOW_IO /* for testing purposes only */ |
| 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | #include "cosa.h" |
| 99 | |
| 100 | /* Maximum length of the identification string. */ |
| 101 | #define COSA_MAX_ID_STRING 128 |
| 102 | |
| 103 | /* Maximum length of the channel name */ |
| 104 | #define COSA_MAX_NAME (sizeof("cosaXXXcXXX")+1) |
| 105 | |
| 106 | /* Per-channel data structure */ |
| 107 | |
| 108 | struct channel_data { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | int usage; /* Usage count; >0 for chrdev, -1 for netdev */ |
| 110 | int num; /* Number of the channel */ |
| 111 | struct cosa_data *cosa; /* Pointer to the per-card structure */ |
| 112 | int txsize; /* Size of transmitted data */ |
| 113 | char *txbuf; /* Transmit buffer */ |
| 114 | char name[COSA_MAX_NAME]; /* channel name */ |
| 115 | |
| 116 | /* The HW layer interface */ |
| 117 | /* routine called from the RX interrupt */ |
| 118 | char *(*setup_rx)(struct channel_data *channel, int size); |
| 119 | /* routine called when the RX is done (from the EOT interrupt) */ |
| 120 | int (*rx_done)(struct channel_data *channel); |
| 121 | /* routine called when the TX is done (from the EOT interrupt) */ |
| 122 | int (*tx_done)(struct channel_data *channel, int size); |
| 123 | |
| 124 | /* Character device parts */ |
Matthias Kaehlcke | 6387c4b | 2008-03-05 18:53:01 -0800 | [diff] [blame] | 125 | struct mutex rlock; |
| 126 | struct semaphore wsem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | char *rxdata; |
| 128 | int rxsize; |
| 129 | wait_queue_head_t txwaitq, rxwaitq; |
| 130 | int tx_status, rx_status; |
| 131 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 132 | /* generic HDLC device parts */ |
| 133 | struct net_device *netdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | struct sk_buff *rx_skb, *tx_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | }; |
| 136 | |
| 137 | /* cosa->firmware_status bits */ |
| 138 | #define COSA_FW_RESET (1<<0) /* Is the ROM monitor active? */ |
| 139 | #define COSA_FW_DOWNLOAD (1<<1) /* Is the microcode downloaded? */ |
| 140 | #define COSA_FW_START (1<<2) /* Is the microcode running? */ |
| 141 | |
| 142 | struct cosa_data { |
| 143 | int num; /* Card number */ |
| 144 | char name[COSA_MAX_NAME]; /* Card name - e.g "cosa0" */ |
| 145 | unsigned int datareg, statusreg; /* I/O ports */ |
| 146 | unsigned short irq, dma; /* IRQ and DMA number */ |
| 147 | unsigned short startaddr; /* Firmware start address */ |
| 148 | unsigned short busmaster; /* Use busmastering? */ |
| 149 | int nchannels; /* # of channels on this card */ |
| 150 | int driver_status; /* For communicating with firmware */ |
| 151 | int firmware_status; /* Downloaded, reseted, etc. */ |
Al Viro | 64b3361 | 2007-10-14 19:35:20 +0100 | [diff] [blame] | 152 | unsigned long rxbitmap, txbitmap;/* Bitmap of channels who are willing to send/receive data */ |
| 153 | unsigned long rxtx; /* RX or TX in progress? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | int enabled; |
| 155 | int usage; /* usage count */ |
| 156 | int txchan, txsize, rxsize; |
| 157 | struct channel_data *rxchan; |
| 158 | char *bouncebuf; |
| 159 | char *txbuf, *rxbuf; |
| 160 | struct channel_data *chan; |
| 161 | spinlock_t lock; /* For exclusive operations on this structure */ |
| 162 | char id_string[COSA_MAX_ID_STRING]; /* ROM monitor ID string */ |
| 163 | char *type; /* card type */ |
| 164 | }; |
| 165 | |
| 166 | /* |
| 167 | * Define this if you want all the possible ports to be autoprobed. |
| 168 | * It is here but it probably is not a good idea to use this. |
| 169 | */ |
| 170 | /* #define COSA_ISA_AUTOPROBE 1 */ |
| 171 | |
| 172 | /* |
| 173 | * Character device major number. 117 was allocated for us. |
| 174 | * The value of 0 means to allocate a first free one. |
| 175 | */ |
| 176 | static int cosa_major = 117; |
| 177 | |
| 178 | /* |
| 179 | * Encoding of the minor numbers: |
| 180 | * The lowest CARD_MINOR_BITS bits means the channel on the single card, |
| 181 | * the highest bits means the card number. |
| 182 | */ |
| 183 | #define CARD_MINOR_BITS 4 /* How many bits in minor number are reserved |
| 184 | * for the single card */ |
| 185 | /* |
| 186 | * The following depends on CARD_MINOR_BITS. Unfortunately, the "MODULE_STRING" |
| 187 | * macro doesn't like anything other than the raw number as an argument :-( |
| 188 | */ |
| 189 | #define MAX_CARDS 16 |
| 190 | /* #define MAX_CARDS (1 << (8-CARD_MINOR_BITS)) */ |
| 191 | |
| 192 | #define DRIVER_RX_READY 0x0001 |
| 193 | #define DRIVER_TX_READY 0x0002 |
| 194 | #define DRIVER_TXMAP_SHIFT 2 |
| 195 | #define DRIVER_TXMAP_MASK 0x0c /* FIXME: 0xfc for 8-channel version */ |
| 196 | |
| 197 | /* |
| 198 | * for cosa->rxtx - indicates whether either transmit or receive is |
| 199 | * in progress. These values are mean number of the bit. |
| 200 | */ |
| 201 | #define TXBIT 0 |
| 202 | #define RXBIT 1 |
| 203 | #define IRQBIT 2 |
| 204 | |
| 205 | #define COSA_MTU 2000 /* FIXME: I don't know this exactly */ |
| 206 | |
| 207 | #undef DEBUG_DATA //1 /* Dump the data read or written to the channel */ |
| 208 | #undef DEBUG_IRQS //1 /* Print the message when the IRQ is received */ |
| 209 | #undef DEBUG_IO //1 /* Dump the I/O traffic */ |
| 210 | |
| 211 | #define TX_TIMEOUT (5*HZ) |
| 212 | |
| 213 | /* Maybe the following should be allocated dynamically */ |
| 214 | static struct cosa_data cosa_cards[MAX_CARDS]; |
| 215 | static int nr_cards; |
| 216 | |
| 217 | #ifdef COSA_ISA_AUTOPROBE |
| 218 | static int io[MAX_CARDS+1] = { 0x220, 0x228, 0x210, 0x218, 0, }; |
| 219 | /* NOTE: DMA is not autoprobed!!! */ |
| 220 | static int dma[MAX_CARDS+1] = { 1, 7, 1, 7, 1, 7, 1, 7, 0, }; |
| 221 | #else |
| 222 | static int io[MAX_CARDS+1]; |
| 223 | static int dma[MAX_CARDS+1]; |
| 224 | #endif |
| 225 | /* IRQ can be safely autoprobed */ |
| 226 | static int irq[MAX_CARDS+1] = { -1, -1, -1, -1, -1, -1, 0, }; |
| 227 | |
| 228 | /* for class stuff*/ |
gregkh@suse.de | 56b2293 | 2005-03-23 10:01:41 -0800 | [diff] [blame] | 229 | static struct class *cosa_class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
| 231 | #ifdef MODULE |
| 232 | module_param_array(io, int, NULL, 0); |
| 233 | MODULE_PARM_DESC(io, "The I/O bases of the COSA or SRP cards"); |
| 234 | module_param_array(irq, int, NULL, 0); |
| 235 | MODULE_PARM_DESC(irq, "The IRQ lines of the COSA or SRP cards"); |
| 236 | module_param_array(dma, int, NULL, 0); |
| 237 | MODULE_PARM_DESC(dma, "The DMA channels of the COSA or SRP cards"); |
| 238 | |
| 239 | MODULE_AUTHOR("Jan \"Yenya\" Kasprzak, <kas@fi.muni.cz>"); |
| 240 | MODULE_DESCRIPTION("Modular driver for the COSA or SRP synchronous card"); |
| 241 | MODULE_LICENSE("GPL"); |
| 242 | #endif |
| 243 | |
| 244 | /* I use this mainly for testing purposes */ |
| 245 | #ifdef COSA_SLOW_IO |
| 246 | #define cosa_outb outb_p |
| 247 | #define cosa_outw outw_p |
| 248 | #define cosa_inb inb_p |
| 249 | #define cosa_inw inw_p |
| 250 | #else |
| 251 | #define cosa_outb outb |
| 252 | #define cosa_outw outw |
| 253 | #define cosa_inb inb |
| 254 | #define cosa_inw inw |
| 255 | #endif |
| 256 | |
| 257 | #define is_8bit(cosa) (!(cosa->datareg & 0x08)) |
| 258 | |
| 259 | #define cosa_getstatus(cosa) (cosa_inb(cosa->statusreg)) |
| 260 | #define cosa_putstatus(cosa, stat) (cosa_outb(stat, cosa->statusreg)) |
| 261 | #define cosa_getdata16(cosa) (cosa_inw(cosa->datareg)) |
| 262 | #define cosa_getdata8(cosa) (cosa_inb(cosa->datareg)) |
| 263 | #define cosa_putdata16(cosa, dt) (cosa_outw(dt, cosa->datareg)) |
| 264 | #define cosa_putdata8(cosa, dt) (cosa_outb(dt, cosa->datareg)) |
| 265 | |
| 266 | /* Initialization stuff */ |
| 267 | static int cosa_probe(int ioaddr, int irq, int dma); |
| 268 | |
| 269 | /* HW interface */ |
| 270 | static void cosa_enable_rx(struct channel_data *chan); |
| 271 | static void cosa_disable_rx(struct channel_data *chan); |
| 272 | static int cosa_start_tx(struct channel_data *channel, char *buf, int size); |
| 273 | static void cosa_kick(struct cosa_data *cosa); |
| 274 | static int cosa_dma_able(struct channel_data *chan, char *buf, int data); |
| 275 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 276 | /* Network device stuff */ |
| 277 | static int cosa_net_attach(struct net_device *dev, unsigned short encoding, |
| 278 | unsigned short parity); |
| 279 | static int cosa_net_open(struct net_device *d); |
| 280 | static int cosa_net_close(struct net_device *d); |
| 281 | static void cosa_net_timeout(struct net_device *d); |
Stephen Hemminger | d71a674 | 2009-08-31 19:50:47 +0000 | [diff] [blame] | 282 | static netdev_tx_t cosa_net_tx(struct sk_buff *skb, struct net_device *d); |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 283 | static char *cosa_net_setup_rx(struct channel_data *channel, int size); |
| 284 | static int cosa_net_rx_done(struct channel_data *channel); |
| 285 | static int cosa_net_tx_done(struct channel_data *channel, int size); |
| 286 | static int cosa_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | |
| 288 | /* Character device */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | static char *chrdev_setup_rx(struct channel_data *channel, int size); |
| 290 | static int chrdev_rx_done(struct channel_data *channel); |
| 291 | static int chrdev_tx_done(struct channel_data *channel, int size); |
| 292 | static ssize_t cosa_read(struct file *file, |
| 293 | char __user *buf, size_t count, loff_t *ppos); |
| 294 | static ssize_t cosa_write(struct file *file, |
| 295 | const char __user *buf, size_t count, loff_t *ppos); |
| 296 | static unsigned int cosa_poll(struct file *file, poll_table *poll); |
| 297 | static int cosa_open(struct inode *inode, struct file *file); |
| 298 | static int cosa_release(struct inode *inode, struct file *file); |
| 299 | static int cosa_chardev_ioctl(struct inode *inode, struct file *file, |
| 300 | unsigned int cmd, unsigned long arg); |
| 301 | #ifdef COSA_FASYNC_WORKING |
| 302 | static int cosa_fasync(struct inode *inode, struct file *file, int on); |
| 303 | #endif |
| 304 | |
Arjan van de Ven | d54b1fd | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 305 | static const struct file_operations cosa_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | .owner = THIS_MODULE, |
| 307 | .llseek = no_llseek, |
| 308 | .read = cosa_read, |
| 309 | .write = cosa_write, |
| 310 | .poll = cosa_poll, |
| 311 | .ioctl = cosa_chardev_ioctl, |
| 312 | .open = cosa_open, |
| 313 | .release = cosa_release, |
| 314 | #ifdef COSA_FASYNC_WORKING |
| 315 | .fasync = cosa_fasync, |
| 316 | #endif |
| 317 | }; |
| 318 | |
| 319 | /* Ioctls */ |
| 320 | static int cosa_start(struct cosa_data *cosa, int address); |
| 321 | static int cosa_reset(struct cosa_data *cosa); |
| 322 | static int cosa_download(struct cosa_data *cosa, void __user *a); |
| 323 | static int cosa_readmem(struct cosa_data *cosa, void __user *a); |
| 324 | |
| 325 | /* COSA/SRP ROM monitor */ |
| 326 | static int download(struct cosa_data *cosa, const char __user *data, int addr, int len); |
| 327 | static int startmicrocode(struct cosa_data *cosa, int address); |
| 328 | static int readmem(struct cosa_data *cosa, char __user *data, int addr, int len); |
| 329 | static int cosa_reset_and_read_id(struct cosa_data *cosa, char *id); |
| 330 | |
| 331 | /* Auxilliary functions */ |
| 332 | static int get_wait_data(struct cosa_data *cosa); |
| 333 | static int put_wait_data(struct cosa_data *cosa, int data); |
| 334 | static int puthexnumber(struct cosa_data *cosa, int number); |
| 335 | static void put_driver_status(struct cosa_data *cosa); |
| 336 | static void put_driver_status_nolock(struct cosa_data *cosa); |
| 337 | |
| 338 | /* Interrupt handling */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 339 | static irqreturn_t cosa_interrupt(int irq, void *cosa); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
| 341 | /* I/O ops debugging */ |
| 342 | #ifdef DEBUG_IO |
| 343 | static void debug_data_in(struct cosa_data *cosa, int data); |
| 344 | static void debug_data_out(struct cosa_data *cosa, int data); |
| 345 | static void debug_data_cmd(struct cosa_data *cosa, int data); |
| 346 | static void debug_status_in(struct cosa_data *cosa, int status); |
| 347 | static void debug_status_out(struct cosa_data *cosa, int status); |
| 348 | #endif |
| 349 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 350 | static inline struct channel_data* dev_to_chan(struct net_device *dev) |
| 351 | { |
| 352 | return (struct channel_data *)dev_to_hdlc(dev)->priv; |
| 353 | } |
| 354 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | /* ---------- Initialization stuff ---------- */ |
| 356 | |
| 357 | static int __init cosa_init(void) |
| 358 | { |
| 359 | int i, err = 0; |
| 360 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | if (cosa_major > 0) { |
| 362 | if (register_chrdev(cosa_major, "cosa", &cosa_fops)) { |
| 363 | printk(KERN_WARNING "cosa: unable to get major %d\n", |
| 364 | cosa_major); |
| 365 | err = -EIO; |
| 366 | goto out; |
| 367 | } |
| 368 | } else { |
| 369 | if (!(cosa_major=register_chrdev(0, "cosa", &cosa_fops))) { |
| 370 | printk(KERN_WARNING "cosa: unable to register chardev\n"); |
| 371 | err = -EIO; |
| 372 | goto out; |
| 373 | } |
| 374 | } |
| 375 | for (i=0; i<MAX_CARDS; i++) |
| 376 | cosa_cards[i].num = -1; |
| 377 | for (i=0; io[i] != 0 && i < MAX_CARDS; i++) |
| 378 | cosa_probe(io[i], irq[i], dma[i]); |
| 379 | if (!nr_cards) { |
| 380 | printk(KERN_WARNING "cosa: no devices found.\n"); |
| 381 | unregister_chrdev(cosa_major, "cosa"); |
| 382 | err = -ENODEV; |
| 383 | goto out; |
| 384 | } |
gregkh@suse.de | 56b2293 | 2005-03-23 10:01:41 -0800 | [diff] [blame] | 385 | cosa_class = class_create(THIS_MODULE, "cosa"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | if (IS_ERR(cosa_class)) { |
| 387 | err = PTR_ERR(cosa_class); |
| 388 | goto out_chrdev; |
| 389 | } |
Greg Kroah-Hartman | e17da9c | 2008-05-21 12:52:33 -0700 | [diff] [blame] | 390 | for (i = 0; i < nr_cards; i++) |
Greg Kroah-Hartman | 6e05d6c | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 391 | device_create(cosa_class, NULL, MKDEV(cosa_major, i), NULL, |
| 392 | "cosa%d", i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | err = 0; |
| 394 | goto out; |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | out_chrdev: |
| 397 | unregister_chrdev(cosa_major, "cosa"); |
| 398 | out: |
| 399 | return err; |
| 400 | } |
| 401 | module_init(cosa_init); |
| 402 | |
| 403 | static void __exit cosa_exit(void) |
| 404 | { |
| 405 | struct cosa_data *cosa; |
| 406 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 408 | for (i = 0; i < nr_cards; i++) |
Tony Jones | 02ff82c | 2007-09-25 02:03:03 +0200 | [diff] [blame] | 409 | device_destroy(cosa_class, MKDEV(cosa_major, i)); |
gregkh@suse.de | 56b2293 | 2005-03-23 10:01:41 -0800 | [diff] [blame] | 410 | class_destroy(cosa_class); |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 411 | |
| 412 | for (cosa = cosa_cards; nr_cards--; cosa++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | /* Clean up the per-channel data */ |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 414 | for (i = 0; i < cosa->nchannels; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | /* Chardev driver has no alloc'd per-channel data */ |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 416 | unregister_hdlc_device(cosa->chan[i].netdev); |
| 417 | free_netdev(cosa->chan[i].netdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | } |
| 419 | /* Clean up the per-card data */ |
| 420 | kfree(cosa->chan); |
| 421 | kfree(cosa->bouncebuf); |
| 422 | free_irq(cosa->irq, cosa); |
| 423 | free_dma(cosa->dma); |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 424 | release_region(cosa->datareg, is_8bit(cosa) ? 2 : 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | } |
| 426 | unregister_chrdev(cosa_major, "cosa"); |
| 427 | } |
| 428 | module_exit(cosa_exit); |
| 429 | |
Krzysztof Hałasa | 991990a | 2009-01-08 22:52:11 +0100 | [diff] [blame] | 430 | static const struct net_device_ops cosa_ops = { |
| 431 | .ndo_open = cosa_net_open, |
| 432 | .ndo_stop = cosa_net_close, |
| 433 | .ndo_change_mtu = hdlc_change_mtu, |
| 434 | .ndo_start_xmit = hdlc_start_xmit, |
| 435 | .ndo_do_ioctl = cosa_net_ioctl, |
| 436 | .ndo_tx_timeout = cosa_net_timeout, |
| 437 | }; |
| 438 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | static int cosa_probe(int base, int irq, int dma) |
| 440 | { |
| 441 | struct cosa_data *cosa = cosa_cards+nr_cards; |
| 442 | int i, err = 0; |
| 443 | |
| 444 | memset(cosa, 0, sizeof(struct cosa_data)); |
| 445 | |
| 446 | /* Checking validity of parameters: */ |
| 447 | /* IRQ should be 2-7 or 10-15; negative IRQ means autoprobe */ |
| 448 | if ((irq >= 0 && irq < 2) || irq > 15 || (irq < 10 && irq > 7)) { |
| 449 | printk (KERN_INFO "cosa_probe: invalid IRQ %d\n", irq); |
| 450 | return -1; |
| 451 | } |
| 452 | /* I/O address should be between 0x100 and 0x3ff and should be |
| 453 | * multiple of 8. */ |
| 454 | if (base < 0x100 || base > 0x3ff || base & 0x7) { |
| 455 | printk (KERN_INFO "cosa_probe: invalid I/O address 0x%x\n", |
| 456 | base); |
| 457 | return -1; |
| 458 | } |
| 459 | /* DMA should be 0,1 or 3-7 */ |
| 460 | if (dma < 0 || dma == 4 || dma > 7) { |
| 461 | printk (KERN_INFO "cosa_probe: invalid DMA %d\n", dma); |
| 462 | return -1; |
| 463 | } |
| 464 | /* and finally, on 16-bit COSA DMA should be 4-7 and |
| 465 | * I/O base should not be multiple of 0x10 */ |
| 466 | if (((base & 0x8) && dma < 4) || (!(base & 0x8) && dma > 3)) { |
| 467 | printk (KERN_INFO "cosa_probe: 8/16 bit base and DMA mismatch" |
| 468 | " (base=0x%x, dma=%d)\n", base, dma); |
| 469 | return -1; |
| 470 | } |
| 471 | |
| 472 | cosa->dma = dma; |
| 473 | cosa->datareg = base; |
| 474 | cosa->statusreg = is_8bit(cosa)?base+1:base+2; |
| 475 | spin_lock_init(&cosa->lock); |
| 476 | |
| 477 | if (!request_region(base, is_8bit(cosa)?2:4,"cosa")) |
| 478 | return -1; |
| 479 | |
| 480 | if (cosa_reset_and_read_id(cosa, cosa->id_string) < 0) { |
| 481 | printk(KERN_DEBUG "cosa: probe at 0x%x failed.\n", base); |
| 482 | err = -1; |
| 483 | goto err_out; |
| 484 | } |
| 485 | |
| 486 | /* Test the validity of identification string */ |
| 487 | if (!strncmp(cosa->id_string, "SRP", 3)) |
| 488 | cosa->type = "srp"; |
| 489 | else if (!strncmp(cosa->id_string, "COSA", 4)) |
| 490 | cosa->type = is_8bit(cosa)? "cosa8": "cosa16"; |
| 491 | else { |
| 492 | /* Print a warning only if we are not autoprobing */ |
| 493 | #ifndef COSA_ISA_AUTOPROBE |
| 494 | printk(KERN_INFO "cosa: valid signature not found at 0x%x.\n", |
| 495 | base); |
| 496 | #endif |
| 497 | err = -1; |
| 498 | goto err_out; |
| 499 | } |
| 500 | /* Update the name of the region now we know the type of card */ |
| 501 | release_region(base, is_8bit(cosa)?2:4); |
| 502 | if (!request_region(base, is_8bit(cosa)?2:4, cosa->type)) { |
| 503 | printk(KERN_DEBUG "cosa: changing name at 0x%x failed.\n", base); |
| 504 | return -1; |
| 505 | } |
| 506 | |
| 507 | /* Now do IRQ autoprobe */ |
| 508 | if (irq < 0) { |
| 509 | unsigned long irqs; |
| 510 | /* printk(KERN_INFO "IRQ autoprobe\n"); */ |
| 511 | irqs = probe_irq_on(); |
| 512 | /* |
| 513 | * Enable interrupt on tx buffer empty (it sure is) |
| 514 | * really sure ? |
| 515 | * FIXME: When this code is not used as module, we should |
| 516 | * probably call udelay() instead of the interruptible sleep. |
| 517 | */ |
| 518 | set_current_state(TASK_INTERRUPTIBLE); |
| 519 | cosa_putstatus(cosa, SR_TX_INT_ENA); |
| 520 | schedule_timeout(30); |
| 521 | irq = probe_irq_off(irqs); |
| 522 | /* Disable all IRQs from the card */ |
| 523 | cosa_putstatus(cosa, 0); |
| 524 | /* Empty the received data register */ |
| 525 | cosa_getdata8(cosa); |
| 526 | |
| 527 | if (irq < 0) { |
| 528 | printk (KERN_INFO "cosa IRQ autoprobe: multiple interrupts obtained (%d, board at 0x%x)\n", |
| 529 | irq, cosa->datareg); |
| 530 | err = -1; |
| 531 | goto err_out; |
| 532 | } |
| 533 | if (irq == 0) { |
| 534 | printk (KERN_INFO "cosa IRQ autoprobe: no interrupt obtained (board at 0x%x)\n", |
| 535 | cosa->datareg); |
| 536 | /* return -1; */ |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | cosa->irq = irq; |
| 541 | cosa->num = nr_cards; |
| 542 | cosa->usage = 0; |
| 543 | cosa->nchannels = 2; /* FIXME: how to determine this? */ |
| 544 | |
| 545 | if (request_irq(cosa->irq, cosa_interrupt, 0, cosa->type, cosa)) { |
| 546 | err = -1; |
| 547 | goto err_out; |
| 548 | } |
| 549 | if (request_dma(cosa->dma, cosa->type)) { |
| 550 | err = -1; |
| 551 | goto err_out1; |
| 552 | } |
| 553 | |
| 554 | cosa->bouncebuf = kmalloc(COSA_MTU, GFP_KERNEL|GFP_DMA); |
| 555 | if (!cosa->bouncebuf) { |
| 556 | err = -ENOMEM; |
| 557 | goto err_out2; |
| 558 | } |
| 559 | sprintf(cosa->name, "cosa%d", cosa->num); |
| 560 | |
| 561 | /* Initialize the per-channel data */ |
Yoann Padioleau | dd00cc4 | 2007-07-19 01:49:03 -0700 | [diff] [blame] | 562 | cosa->chan = kcalloc(cosa->nchannels, sizeof(struct channel_data), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | if (!cosa->chan) { |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 564 | err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | goto err_out3; |
| 566 | } |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 567 | |
| 568 | for (i = 0; i < cosa->nchannels; i++) { |
| 569 | struct channel_data *chan = &cosa->chan[i]; |
| 570 | |
| 571 | chan->cosa = cosa; |
| 572 | chan->num = i; |
| 573 | sprintf(chan->name, "cosa%dc%d", chan->cosa->num, i); |
| 574 | |
| 575 | /* Initialize the chardev data structures */ |
| 576 | mutex_init(&chan->rlock); |
| 577 | init_MUTEX(&chan->wsem); |
| 578 | |
| 579 | /* Register the network interface */ |
| 580 | if (!(chan->netdev = alloc_hdlcdev(chan))) { |
| 581 | printk(KERN_WARNING "%s: alloc_hdlcdev failed.\n", |
| 582 | chan->name); |
| 583 | goto err_hdlcdev; |
| 584 | } |
| 585 | dev_to_hdlc(chan->netdev)->attach = cosa_net_attach; |
| 586 | dev_to_hdlc(chan->netdev)->xmit = cosa_net_tx; |
Krzysztof Hałasa | 991990a | 2009-01-08 22:52:11 +0100 | [diff] [blame] | 587 | chan->netdev->netdev_ops = &cosa_ops; |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 588 | chan->netdev->watchdog_timeo = TX_TIMEOUT; |
| 589 | chan->netdev->base_addr = chan->cosa->datareg; |
| 590 | chan->netdev->irq = chan->cosa->irq; |
| 591 | chan->netdev->dma = chan->cosa->dma; |
| 592 | if (register_hdlc_device(chan->netdev)) { |
| 593 | printk(KERN_WARNING "%s: register_hdlc_device()" |
| 594 | " failed.\n", chan->netdev->name); |
| 595 | free_netdev(chan->netdev); |
| 596 | goto err_hdlcdev; |
| 597 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | } |
| 599 | |
| 600 | printk (KERN_INFO "cosa%d: %s (%s at 0x%x irq %d dma %d), %d channels\n", |
| 601 | cosa->num, cosa->id_string, cosa->type, |
| 602 | cosa->datareg, cosa->irq, cosa->dma, cosa->nchannels); |
| 603 | |
| 604 | return nr_cards++; |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 605 | |
| 606 | err_hdlcdev: |
| 607 | while (i-- > 0) { |
| 608 | unregister_hdlc_device(cosa->chan[i].netdev); |
| 609 | free_netdev(cosa->chan[i].netdev); |
| 610 | } |
| 611 | kfree(cosa->chan); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | err_out3: |
| 613 | kfree(cosa->bouncebuf); |
| 614 | err_out2: |
| 615 | free_dma(cosa->dma); |
| 616 | err_out1: |
| 617 | free_irq(cosa->irq, cosa); |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 618 | err_out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | release_region(cosa->datareg,is_8bit(cosa)?2:4); |
| 620 | printk(KERN_NOTICE "cosa%d: allocating resources failed\n", |
| 621 | cosa->num); |
| 622 | return err; |
| 623 | } |
| 624 | |
| 625 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 626 | /*---------- network device ---------- */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 628 | static int cosa_net_attach(struct net_device *dev, unsigned short encoding, |
| 629 | unsigned short parity) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | { |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 631 | if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT) |
| 632 | return 0; |
| 633 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | } |
| 635 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 636 | static int cosa_net_open(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | { |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 638 | struct channel_data *chan = dev_to_chan(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | int err; |
| 640 | unsigned long flags; |
| 641 | |
| 642 | if (!(chan->cosa->firmware_status & COSA_FW_START)) { |
| 643 | printk(KERN_NOTICE "%s: start the firmware first (status %d)\n", |
| 644 | chan->cosa->name, chan->cosa->firmware_status); |
| 645 | return -EPERM; |
| 646 | } |
| 647 | spin_lock_irqsave(&chan->cosa->lock, flags); |
| 648 | if (chan->usage != 0) { |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 649 | printk(KERN_WARNING "%s: cosa_net_open called with usage count" |
| 650 | " %d\n", chan->name, chan->usage); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | spin_unlock_irqrestore(&chan->cosa->lock, flags); |
| 652 | return -EBUSY; |
| 653 | } |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 654 | chan->setup_rx = cosa_net_setup_rx; |
| 655 | chan->tx_done = cosa_net_tx_done; |
| 656 | chan->rx_done = cosa_net_rx_done; |
| 657 | chan->usage = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | chan->cosa->usage++; |
| 659 | spin_unlock_irqrestore(&chan->cosa->lock, flags); |
| 660 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 661 | err = hdlc_open(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | if (err) { |
| 663 | spin_lock_irqsave(&chan->cosa->lock, flags); |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 664 | chan->usage = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | chan->cosa->usage--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | spin_unlock_irqrestore(&chan->cosa->lock, flags); |
| 667 | return err; |
| 668 | } |
| 669 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 670 | netif_start_queue(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | cosa_enable_rx(chan); |
| 672 | return 0; |
| 673 | } |
| 674 | |
Stephen Hemminger | d71a674 | 2009-08-31 19:50:47 +0000 | [diff] [blame] | 675 | static netdev_tx_t cosa_net_tx(struct sk_buff *skb, |
| 676 | struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | { |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 678 | struct channel_data *chan = dev_to_chan(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
| 680 | netif_stop_queue(dev); |
| 681 | |
| 682 | chan->tx_skb = skb; |
| 683 | cosa_start_tx(chan, skb->data, skb->len); |
Stephen Hemminger | d71a674 | 2009-08-31 19:50:47 +0000 | [diff] [blame] | 684 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | } |
| 686 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 687 | static void cosa_net_timeout(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | { |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 689 | struct channel_data *chan = dev_to_chan(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
| 691 | if (test_bit(RXBIT, &chan->cosa->rxtx)) { |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 692 | chan->netdev->stats.rx_errors++; |
| 693 | chan->netdev->stats.rx_missed_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | } else { |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 695 | chan->netdev->stats.tx_errors++; |
| 696 | chan->netdev->stats.tx_aborted_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | } |
| 698 | cosa_kick(chan->cosa); |
| 699 | if (chan->tx_skb) { |
| 700 | dev_kfree_skb(chan->tx_skb); |
| 701 | chan->tx_skb = NULL; |
| 702 | } |
| 703 | netif_wake_queue(dev); |
| 704 | } |
| 705 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 706 | static int cosa_net_close(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | { |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 708 | struct channel_data *chan = dev_to_chan(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | unsigned long flags; |
| 710 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 711 | netif_stop_queue(dev); |
| 712 | hdlc_close(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | cosa_disable_rx(chan); |
| 714 | spin_lock_irqsave(&chan->cosa->lock, flags); |
| 715 | if (chan->rx_skb) { |
| 716 | kfree_skb(chan->rx_skb); |
| 717 | chan->rx_skb = NULL; |
| 718 | } |
| 719 | if (chan->tx_skb) { |
| 720 | kfree_skb(chan->tx_skb); |
| 721 | chan->tx_skb = NULL; |
| 722 | } |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 723 | chan->usage = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | chan->cosa->usage--; |
| 725 | spin_unlock_irqrestore(&chan->cosa->lock, flags); |
| 726 | return 0; |
| 727 | } |
| 728 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 729 | static char *cosa_net_setup_rx(struct channel_data *chan, int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | { |
| 731 | /* |
| 732 | * We can safely fall back to non-dma-able memory, because we have |
| 733 | * the cosa->bouncebuf pre-allocated. |
| 734 | */ |
Wei Yongjun | fbbfb98 | 2009-02-25 00:22:41 +0000 | [diff] [blame] | 735 | kfree_skb(chan->rx_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | chan->rx_skb = dev_alloc_skb(size); |
| 737 | if (chan->rx_skb == NULL) { |
| 738 | printk(KERN_NOTICE "%s: Memory squeeze, dropping packet\n", |
| 739 | chan->name); |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 740 | chan->netdev->stats.rx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | return NULL; |
| 742 | } |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 743 | chan->netdev->trans_start = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | return skb_put(chan->rx_skb, size); |
| 745 | } |
| 746 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 747 | static int cosa_net_rx_done(struct channel_data *chan) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | { |
| 749 | if (!chan->rx_skb) { |
| 750 | printk(KERN_WARNING "%s: rx_done with empty skb!\n", |
| 751 | chan->name); |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 752 | chan->netdev->stats.rx_errors++; |
| 753 | chan->netdev->stats.rx_frame_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | return 0; |
| 755 | } |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 756 | chan->rx_skb->protocol = hdlc_type_trans(chan->rx_skb, chan->netdev); |
| 757 | chan->rx_skb->dev = chan->netdev; |
David S. Miller | 2f7826c | 2007-03-26 02:00:58 -0700 | [diff] [blame] | 758 | skb_reset_mac_header(chan->rx_skb); |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 759 | chan->netdev->stats.rx_packets++; |
| 760 | chan->netdev->stats.rx_bytes += chan->cosa->rxsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | netif_rx(chan->rx_skb); |
| 762 | chan->rx_skb = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | return 0; |
| 764 | } |
| 765 | |
| 766 | /* ARGSUSED */ |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 767 | static int cosa_net_tx_done(struct channel_data *chan, int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | { |
| 769 | if (!chan->tx_skb) { |
| 770 | printk(KERN_WARNING "%s: tx_done with empty skb!\n", |
| 771 | chan->name); |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 772 | chan->netdev->stats.tx_errors++; |
| 773 | chan->netdev->stats.tx_aborted_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | return 1; |
| 775 | } |
| 776 | dev_kfree_skb_irq(chan->tx_skb); |
| 777 | chan->tx_skb = NULL; |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 778 | chan->netdev->stats.tx_packets++; |
| 779 | chan->netdev->stats.tx_bytes += size; |
| 780 | netif_wake_queue(chan->netdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | return 1; |
| 782 | } |
| 783 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | /*---------- Character device ---------- */ |
| 785 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | static ssize_t cosa_read(struct file *file, |
| 787 | char __user *buf, size_t count, loff_t *ppos) |
| 788 | { |
| 789 | DECLARE_WAITQUEUE(wait, current); |
| 790 | unsigned long flags; |
| 791 | struct channel_data *chan = file->private_data; |
| 792 | struct cosa_data *cosa = chan->cosa; |
| 793 | char *kbuf; |
| 794 | |
| 795 | if (!(cosa->firmware_status & COSA_FW_START)) { |
| 796 | printk(KERN_NOTICE "%s: start the firmware first (status %d)\n", |
| 797 | cosa->name, cosa->firmware_status); |
| 798 | return -EPERM; |
| 799 | } |
Matthias Kaehlcke | 6387c4b | 2008-03-05 18:53:01 -0800 | [diff] [blame] | 800 | if (mutex_lock_interruptible(&chan->rlock)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | return -ERESTARTSYS; |
| 802 | |
| 803 | if ((chan->rxdata = kmalloc(COSA_MTU, GFP_DMA|GFP_KERNEL)) == NULL) { |
| 804 | printk(KERN_INFO "%s: cosa_read() - OOM\n", cosa->name); |
Matthias Kaehlcke | 6387c4b | 2008-03-05 18:53:01 -0800 | [diff] [blame] | 805 | mutex_unlock(&chan->rlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | return -ENOMEM; |
| 807 | } |
| 808 | |
| 809 | chan->rx_status = 0; |
| 810 | cosa_enable_rx(chan); |
| 811 | spin_lock_irqsave(&cosa->lock, flags); |
| 812 | add_wait_queue(&chan->rxwaitq, &wait); |
| 813 | while(!chan->rx_status) { |
| 814 | current->state = TASK_INTERRUPTIBLE; |
| 815 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 816 | schedule(); |
| 817 | spin_lock_irqsave(&cosa->lock, flags); |
| 818 | if (signal_pending(current) && chan->rx_status == 0) { |
| 819 | chan->rx_status = 1; |
| 820 | remove_wait_queue(&chan->rxwaitq, &wait); |
| 821 | current->state = TASK_RUNNING; |
| 822 | spin_unlock_irqrestore(&cosa->lock, flags); |
Matthias Kaehlcke | 6387c4b | 2008-03-05 18:53:01 -0800 | [diff] [blame] | 823 | mutex_unlock(&chan->rlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | return -ERESTARTSYS; |
| 825 | } |
| 826 | } |
| 827 | remove_wait_queue(&chan->rxwaitq, &wait); |
| 828 | current->state = TASK_RUNNING; |
| 829 | kbuf = chan->rxdata; |
| 830 | count = chan->rxsize; |
| 831 | spin_unlock_irqrestore(&cosa->lock, flags); |
Matthias Kaehlcke | 6387c4b | 2008-03-05 18:53:01 -0800 | [diff] [blame] | 832 | mutex_unlock(&chan->rlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | |
| 834 | if (copy_to_user(buf, kbuf, count)) { |
| 835 | kfree(kbuf); |
| 836 | return -EFAULT; |
| 837 | } |
| 838 | kfree(kbuf); |
| 839 | return count; |
| 840 | } |
| 841 | |
| 842 | static char *chrdev_setup_rx(struct channel_data *chan, int size) |
| 843 | { |
| 844 | /* Expect size <= COSA_MTU */ |
| 845 | chan->rxsize = size; |
| 846 | return chan->rxdata; |
| 847 | } |
| 848 | |
| 849 | static int chrdev_rx_done(struct channel_data *chan) |
| 850 | { |
| 851 | if (chan->rx_status) { /* Reader has died */ |
| 852 | kfree(chan->rxdata); |
| 853 | up(&chan->wsem); |
| 854 | } |
| 855 | chan->rx_status = 1; |
| 856 | wake_up_interruptible(&chan->rxwaitq); |
| 857 | return 1; |
| 858 | } |
| 859 | |
| 860 | |
| 861 | static ssize_t cosa_write(struct file *file, |
| 862 | const char __user *buf, size_t count, loff_t *ppos) |
| 863 | { |
| 864 | DECLARE_WAITQUEUE(wait, current); |
| 865 | struct channel_data *chan = file->private_data; |
| 866 | struct cosa_data *cosa = chan->cosa; |
| 867 | unsigned long flags; |
| 868 | char *kbuf; |
| 869 | |
| 870 | if (!(cosa->firmware_status & COSA_FW_START)) { |
| 871 | printk(KERN_NOTICE "%s: start the firmware first (status %d)\n", |
| 872 | cosa->name, cosa->firmware_status); |
| 873 | return -EPERM; |
| 874 | } |
| 875 | if (down_interruptible(&chan->wsem)) |
| 876 | return -ERESTARTSYS; |
| 877 | |
| 878 | if (count > COSA_MTU) |
| 879 | count = COSA_MTU; |
| 880 | |
| 881 | /* Allocate the buffer */ |
| 882 | if ((kbuf = kmalloc(count, GFP_KERNEL|GFP_DMA)) == NULL) { |
| 883 | printk(KERN_NOTICE "%s: cosa_write() OOM - dropping packet\n", |
| 884 | cosa->name); |
| 885 | up(&chan->wsem); |
| 886 | return -ENOMEM; |
| 887 | } |
| 888 | if (copy_from_user(kbuf, buf, count)) { |
| 889 | up(&chan->wsem); |
| 890 | kfree(kbuf); |
| 891 | return -EFAULT; |
| 892 | } |
| 893 | chan->tx_status=0; |
| 894 | cosa_start_tx(chan, kbuf, count); |
| 895 | |
| 896 | spin_lock_irqsave(&cosa->lock, flags); |
| 897 | add_wait_queue(&chan->txwaitq, &wait); |
| 898 | while(!chan->tx_status) { |
| 899 | current->state = TASK_INTERRUPTIBLE; |
| 900 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 901 | schedule(); |
| 902 | spin_lock_irqsave(&cosa->lock, flags); |
| 903 | if (signal_pending(current) && chan->tx_status == 0) { |
| 904 | chan->tx_status = 1; |
| 905 | remove_wait_queue(&chan->txwaitq, &wait); |
| 906 | current->state = TASK_RUNNING; |
| 907 | chan->tx_status = 1; |
| 908 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 909 | return -ERESTARTSYS; |
| 910 | } |
| 911 | } |
| 912 | remove_wait_queue(&chan->txwaitq, &wait); |
| 913 | current->state = TASK_RUNNING; |
| 914 | up(&chan->wsem); |
| 915 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 916 | kfree(kbuf); |
| 917 | return count; |
| 918 | } |
| 919 | |
| 920 | static int chrdev_tx_done(struct channel_data *chan, int size) |
| 921 | { |
| 922 | if (chan->tx_status) { /* Writer was interrupted */ |
| 923 | kfree(chan->txbuf); |
| 924 | up(&chan->wsem); |
| 925 | } |
| 926 | chan->tx_status = 1; |
| 927 | wake_up_interruptible(&chan->txwaitq); |
| 928 | return 1; |
| 929 | } |
| 930 | |
| 931 | static unsigned int cosa_poll(struct file *file, poll_table *poll) |
| 932 | { |
| 933 | printk(KERN_INFO "cosa_poll is here\n"); |
| 934 | return 0; |
| 935 | } |
| 936 | |
| 937 | static int cosa_open(struct inode *inode, struct file *file) |
| 938 | { |
| 939 | struct cosa_data *cosa; |
| 940 | struct channel_data *chan; |
| 941 | unsigned long flags; |
| 942 | int n; |
Jonathan Corbet | 0911810 | 2008-05-15 09:21:33 -0600 | [diff] [blame] | 943 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | |
Jonathan Corbet | 0911810 | 2008-05-15 09:21:33 -0600 | [diff] [blame] | 945 | lock_kernel(); |
Josef Sipek | f04538c | 2006-12-08 02:36:57 -0800 | [diff] [blame] | 946 | if ((n=iminor(file->f_path.dentry->d_inode)>>CARD_MINOR_BITS) |
Jonathan Corbet | 0911810 | 2008-05-15 09:21:33 -0600 | [diff] [blame] | 947 | >= nr_cards) { |
| 948 | ret = -ENODEV; |
| 949 | goto out; |
| 950 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | cosa = cosa_cards+n; |
| 952 | |
Josef Sipek | f04538c | 2006-12-08 02:36:57 -0800 | [diff] [blame] | 953 | if ((n=iminor(file->f_path.dentry->d_inode) |
Jonathan Corbet | 0911810 | 2008-05-15 09:21:33 -0600 | [diff] [blame] | 954 | & ((1<<CARD_MINOR_BITS)-1)) >= cosa->nchannels) { |
| 955 | ret = -ENODEV; |
| 956 | goto out; |
| 957 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | chan = cosa->chan + n; |
| 959 | |
| 960 | file->private_data = chan; |
| 961 | |
| 962 | spin_lock_irqsave(&cosa->lock, flags); |
| 963 | |
| 964 | if (chan->usage < 0) { /* in netdev mode */ |
| 965 | spin_unlock_irqrestore(&cosa->lock, flags); |
Jonathan Corbet | 0911810 | 2008-05-15 09:21:33 -0600 | [diff] [blame] | 966 | ret = -EBUSY; |
| 967 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | } |
| 969 | cosa->usage++; |
| 970 | chan->usage++; |
| 971 | |
| 972 | chan->tx_done = chrdev_tx_done; |
| 973 | chan->setup_rx = chrdev_setup_rx; |
| 974 | chan->rx_done = chrdev_rx_done; |
| 975 | spin_unlock_irqrestore(&cosa->lock, flags); |
Jonathan Corbet | 0911810 | 2008-05-15 09:21:33 -0600 | [diff] [blame] | 976 | out: |
| 977 | unlock_kernel(); |
| 978 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | } |
| 980 | |
| 981 | static int cosa_release(struct inode *inode, struct file *file) |
| 982 | { |
| 983 | struct channel_data *channel = file->private_data; |
| 984 | struct cosa_data *cosa; |
| 985 | unsigned long flags; |
| 986 | |
| 987 | cosa = channel->cosa; |
| 988 | spin_lock_irqsave(&cosa->lock, flags); |
| 989 | cosa->usage--; |
| 990 | channel->usage--; |
| 991 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 992 | return 0; |
| 993 | } |
| 994 | |
| 995 | #ifdef COSA_FASYNC_WORKING |
| 996 | static struct fasync_struct *fasync[256] = { NULL, }; |
| 997 | |
| 998 | /* To be done ... */ |
| 999 | static int cosa_fasync(struct inode *inode, struct file *file, int on) |
| 1000 | { |
| 1001 | int port = iminor(inode); |
Jonathan Corbet | 60aa492 | 2009-02-01 14:52:56 -0700 | [diff] [blame] | 1002 | |
| 1003 | return fasync_helper(inode, file, on, &fasync[port]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | } |
| 1005 | #endif |
| 1006 | |
| 1007 | |
| 1008 | /* ---------- Ioctls ---------- */ |
| 1009 | |
| 1010 | /* |
| 1011 | * Ioctl subroutines can safely be made inline, because they are called |
| 1012 | * only from cosa_ioctl(). |
| 1013 | */ |
| 1014 | static inline int cosa_reset(struct cosa_data *cosa) |
| 1015 | { |
| 1016 | char idstring[COSA_MAX_ID_STRING]; |
| 1017 | if (cosa->usage > 1) |
| 1018 | printk(KERN_INFO "cosa%d: WARNING: reset requested with cosa->usage > 1 (%d). Odd things may happen.\n", |
| 1019 | cosa->num, cosa->usage); |
| 1020 | cosa->firmware_status &= ~(COSA_FW_RESET|COSA_FW_START); |
| 1021 | if (cosa_reset_and_read_id(cosa, idstring) < 0) { |
| 1022 | printk(KERN_NOTICE "cosa%d: reset failed\n", cosa->num); |
| 1023 | return -EIO; |
| 1024 | } |
| 1025 | printk(KERN_INFO "cosa%d: resetting device: %s\n", cosa->num, |
| 1026 | idstring); |
| 1027 | cosa->firmware_status |= COSA_FW_RESET; |
| 1028 | return 0; |
| 1029 | } |
| 1030 | |
| 1031 | /* High-level function to download data into COSA memory. Calls download() */ |
| 1032 | static inline int cosa_download(struct cosa_data *cosa, void __user *arg) |
| 1033 | { |
| 1034 | struct cosa_download d; |
| 1035 | int i; |
| 1036 | |
| 1037 | if (cosa->usage > 1) |
| 1038 | printk(KERN_INFO "%s: WARNING: download of microcode requested with cosa->usage > 1 (%d). Odd things may happen.\n", |
| 1039 | cosa->name, cosa->usage); |
| 1040 | if (!(cosa->firmware_status & COSA_FW_RESET)) { |
| 1041 | printk(KERN_NOTICE "%s: reset the card first (status %d).\n", |
| 1042 | cosa->name, cosa->firmware_status); |
| 1043 | return -EPERM; |
| 1044 | } |
| 1045 | |
| 1046 | if (copy_from_user(&d, arg, sizeof(d))) |
| 1047 | return -EFAULT; |
| 1048 | |
| 1049 | if (d.addr < 0 || d.addr > COSA_MAX_FIRMWARE_SIZE) |
| 1050 | return -EINVAL; |
| 1051 | if (d.len < 0 || d.len > COSA_MAX_FIRMWARE_SIZE) |
| 1052 | return -EINVAL; |
| 1053 | |
| 1054 | |
| 1055 | /* If something fails, force the user to reset the card */ |
| 1056 | cosa->firmware_status &= ~(COSA_FW_RESET|COSA_FW_DOWNLOAD); |
| 1057 | |
| 1058 | i = download(cosa, d.code, d.len, d.addr); |
| 1059 | if (i < 0) { |
| 1060 | printk(KERN_NOTICE "cosa%d: microcode download failed: %d\n", |
| 1061 | cosa->num, i); |
| 1062 | return -EIO; |
| 1063 | } |
| 1064 | printk(KERN_INFO "cosa%d: downloading microcode - 0x%04x bytes at 0x%04x\n", |
| 1065 | cosa->num, d.len, d.addr); |
| 1066 | cosa->firmware_status |= COSA_FW_RESET|COSA_FW_DOWNLOAD; |
| 1067 | return 0; |
| 1068 | } |
| 1069 | |
| 1070 | /* High-level function to read COSA memory. Calls readmem() */ |
| 1071 | static inline int cosa_readmem(struct cosa_data *cosa, void __user *arg) |
| 1072 | { |
| 1073 | struct cosa_download d; |
| 1074 | int i; |
| 1075 | |
| 1076 | if (cosa->usage > 1) |
| 1077 | printk(KERN_INFO "cosa%d: WARNING: readmem requested with " |
| 1078 | "cosa->usage > 1 (%d). Odd things may happen.\n", |
| 1079 | cosa->num, cosa->usage); |
| 1080 | if (!(cosa->firmware_status & COSA_FW_RESET)) { |
| 1081 | printk(KERN_NOTICE "%s: reset the card first (status %d).\n", |
| 1082 | cosa->name, cosa->firmware_status); |
| 1083 | return -EPERM; |
| 1084 | } |
| 1085 | |
| 1086 | if (copy_from_user(&d, arg, sizeof(d))) |
| 1087 | return -EFAULT; |
| 1088 | |
| 1089 | /* If something fails, force the user to reset the card */ |
| 1090 | cosa->firmware_status &= ~COSA_FW_RESET; |
| 1091 | |
| 1092 | i = readmem(cosa, d.code, d.len, d.addr); |
| 1093 | if (i < 0) { |
| 1094 | printk(KERN_NOTICE "cosa%d: reading memory failed: %d\n", |
| 1095 | cosa->num, i); |
| 1096 | return -EIO; |
| 1097 | } |
| 1098 | printk(KERN_INFO "cosa%d: reading card memory - 0x%04x bytes at 0x%04x\n", |
| 1099 | cosa->num, d.len, d.addr); |
| 1100 | cosa->firmware_status |= COSA_FW_RESET; |
| 1101 | return 0; |
| 1102 | } |
| 1103 | |
| 1104 | /* High-level function to start microcode. Calls startmicrocode(). */ |
| 1105 | static inline int cosa_start(struct cosa_data *cosa, int address) |
| 1106 | { |
| 1107 | int i; |
| 1108 | |
| 1109 | if (cosa->usage > 1) |
| 1110 | printk(KERN_INFO "cosa%d: WARNING: start microcode requested with cosa->usage > 1 (%d). Odd things may happen.\n", |
| 1111 | cosa->num, cosa->usage); |
| 1112 | |
| 1113 | if ((cosa->firmware_status & (COSA_FW_RESET|COSA_FW_DOWNLOAD)) |
| 1114 | != (COSA_FW_RESET|COSA_FW_DOWNLOAD)) { |
| 1115 | printk(KERN_NOTICE "%s: download the microcode and/or reset the card first (status %d).\n", |
| 1116 | cosa->name, cosa->firmware_status); |
| 1117 | return -EPERM; |
| 1118 | } |
| 1119 | cosa->firmware_status &= ~COSA_FW_RESET; |
| 1120 | if ((i=startmicrocode(cosa, address)) < 0) { |
| 1121 | printk(KERN_NOTICE "cosa%d: start microcode at 0x%04x failed: %d\n", |
| 1122 | cosa->num, address, i); |
| 1123 | return -EIO; |
| 1124 | } |
| 1125 | printk(KERN_INFO "cosa%d: starting microcode at 0x%04x\n", |
| 1126 | cosa->num, address); |
| 1127 | cosa->startaddr = address; |
| 1128 | cosa->firmware_status |= COSA_FW_START; |
| 1129 | return 0; |
| 1130 | } |
| 1131 | |
| 1132 | /* Buffer of size at least COSA_MAX_ID_STRING is expected */ |
| 1133 | static inline int cosa_getidstr(struct cosa_data *cosa, char __user *string) |
| 1134 | { |
| 1135 | int l = strlen(cosa->id_string)+1; |
| 1136 | if (copy_to_user(string, cosa->id_string, l)) |
| 1137 | return -EFAULT; |
| 1138 | return l; |
| 1139 | } |
| 1140 | |
| 1141 | /* Buffer of size at least COSA_MAX_ID_STRING is expected */ |
| 1142 | static inline int cosa_gettype(struct cosa_data *cosa, char __user *string) |
| 1143 | { |
| 1144 | int l = strlen(cosa->type)+1; |
| 1145 | if (copy_to_user(string, cosa->type, l)) |
| 1146 | return -EFAULT; |
| 1147 | return l; |
| 1148 | } |
| 1149 | |
| 1150 | static int cosa_ioctl_common(struct cosa_data *cosa, |
| 1151 | struct channel_data *channel, unsigned int cmd, unsigned long arg) |
| 1152 | { |
| 1153 | void __user *argp = (void __user *)arg; |
| 1154 | switch(cmd) { |
| 1155 | case COSAIORSET: /* Reset the device */ |
| 1156 | if (!capable(CAP_NET_ADMIN)) |
| 1157 | return -EACCES; |
| 1158 | return cosa_reset(cosa); |
| 1159 | case COSAIOSTRT: /* Start the firmware */ |
| 1160 | if (!capable(CAP_SYS_RAWIO)) |
| 1161 | return -EACCES; |
| 1162 | return cosa_start(cosa, arg); |
| 1163 | case COSAIODOWNLD: /* Download the firmware */ |
| 1164 | if (!capable(CAP_SYS_RAWIO)) |
| 1165 | return -EACCES; |
| 1166 | |
| 1167 | return cosa_download(cosa, argp); |
| 1168 | case COSAIORMEM: |
| 1169 | if (!capable(CAP_SYS_RAWIO)) |
| 1170 | return -EACCES; |
| 1171 | return cosa_readmem(cosa, argp); |
| 1172 | case COSAIORTYPE: |
| 1173 | return cosa_gettype(cosa, argp); |
| 1174 | case COSAIORIDSTR: |
| 1175 | return cosa_getidstr(cosa, argp); |
| 1176 | case COSAIONRCARDS: |
| 1177 | return nr_cards; |
| 1178 | case COSAIONRCHANS: |
| 1179 | return cosa->nchannels; |
| 1180 | case COSAIOBMSET: |
| 1181 | if (!capable(CAP_SYS_RAWIO)) |
| 1182 | return -EACCES; |
| 1183 | if (is_8bit(cosa)) |
| 1184 | return -EINVAL; |
| 1185 | if (arg != COSA_BM_OFF && arg != COSA_BM_ON) |
| 1186 | return -EINVAL; |
| 1187 | cosa->busmaster = arg; |
| 1188 | return 0; |
| 1189 | case COSAIOBMGET: |
| 1190 | return cosa->busmaster; |
| 1191 | } |
| 1192 | return -ENOIOCTLCMD; |
| 1193 | } |
| 1194 | |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 1195 | static int cosa_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | { |
| 1197 | int rv; |
Krzysztof Hałasa | aca2575 | 2008-07-01 23:40:29 +0200 | [diff] [blame] | 1198 | struct channel_data *chan = dev_to_chan(dev); |
| 1199 | rv = cosa_ioctl_common(chan->cosa, chan, cmd, |
| 1200 | (unsigned long)ifr->ifr_data); |
| 1201 | if (rv != -ENOIOCTLCMD) |
| 1202 | return rv; |
| 1203 | return hdlc_ioctl(dev, ifr, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | } |
| 1205 | |
| 1206 | static int cosa_chardev_ioctl(struct inode *inode, struct file *file, |
| 1207 | unsigned int cmd, unsigned long arg) |
| 1208 | { |
| 1209 | struct channel_data *channel = file->private_data; |
| 1210 | struct cosa_data *cosa = channel->cosa; |
| 1211 | return cosa_ioctl_common(cosa, channel, cmd, arg); |
| 1212 | } |
| 1213 | |
| 1214 | |
| 1215 | /*---------- HW layer interface ---------- */ |
| 1216 | |
| 1217 | /* |
| 1218 | * The higher layer can bind itself to the HW layer by setting the callbacks |
| 1219 | * in the channel_data structure and by using these routines. |
| 1220 | */ |
| 1221 | static void cosa_enable_rx(struct channel_data *chan) |
| 1222 | { |
| 1223 | struct cosa_data *cosa = chan->cosa; |
| 1224 | |
| 1225 | if (!test_and_set_bit(chan->num, &cosa->rxbitmap)) |
| 1226 | put_driver_status(cosa); |
| 1227 | } |
| 1228 | |
| 1229 | static void cosa_disable_rx(struct channel_data *chan) |
| 1230 | { |
| 1231 | struct cosa_data *cosa = chan->cosa; |
| 1232 | |
| 1233 | if (test_and_clear_bit(chan->num, &cosa->rxbitmap)) |
| 1234 | put_driver_status(cosa); |
| 1235 | } |
| 1236 | |
| 1237 | /* |
| 1238 | * FIXME: This routine probably should check for cosa_start_tx() called when |
| 1239 | * the previous transmit is still unfinished. In this case the non-zero |
| 1240 | * return value should indicate to the caller that the queuing(sp?) up |
| 1241 | * the transmit has failed. |
| 1242 | */ |
| 1243 | static int cosa_start_tx(struct channel_data *chan, char *buf, int len) |
| 1244 | { |
| 1245 | struct cosa_data *cosa = chan->cosa; |
| 1246 | unsigned long flags; |
| 1247 | #ifdef DEBUG_DATA |
| 1248 | int i; |
| 1249 | |
| 1250 | printk(KERN_INFO "cosa%dc%d: starting tx(0x%x)", chan->cosa->num, |
| 1251 | chan->num, len); |
| 1252 | for (i=0; i<len; i++) |
| 1253 | printk(" %02x", buf[i]&0xff); |
| 1254 | printk("\n"); |
| 1255 | #endif |
| 1256 | spin_lock_irqsave(&cosa->lock, flags); |
| 1257 | chan->txbuf = buf; |
| 1258 | chan->txsize = len; |
| 1259 | if (len > COSA_MTU) |
| 1260 | chan->txsize = COSA_MTU; |
| 1261 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 1262 | |
| 1263 | /* Tell the firmware we are ready */ |
| 1264 | set_bit(chan->num, &cosa->txbitmap); |
| 1265 | put_driver_status(cosa); |
| 1266 | |
| 1267 | return 0; |
| 1268 | } |
| 1269 | |
| 1270 | static void put_driver_status(struct cosa_data *cosa) |
| 1271 | { |
| 1272 | unsigned long flags; |
| 1273 | int status; |
| 1274 | |
| 1275 | spin_lock_irqsave(&cosa->lock, flags); |
| 1276 | |
| 1277 | status = (cosa->rxbitmap ? DRIVER_RX_READY : 0) |
| 1278 | | (cosa->txbitmap ? DRIVER_TX_READY : 0) |
| 1279 | | (cosa->txbitmap? ~(cosa->txbitmap<<DRIVER_TXMAP_SHIFT) |
| 1280 | &DRIVER_TXMAP_MASK : 0); |
| 1281 | if (!cosa->rxtx) { |
| 1282 | if (cosa->rxbitmap|cosa->txbitmap) { |
| 1283 | if (!cosa->enabled) { |
| 1284 | cosa_putstatus(cosa, SR_RX_INT_ENA); |
| 1285 | #ifdef DEBUG_IO |
| 1286 | debug_status_out(cosa, SR_RX_INT_ENA); |
| 1287 | #endif |
| 1288 | cosa->enabled = 1; |
| 1289 | } |
| 1290 | } else if (cosa->enabled) { |
| 1291 | cosa->enabled = 0; |
| 1292 | cosa_putstatus(cosa, 0); |
| 1293 | #ifdef DEBUG_IO |
| 1294 | debug_status_out(cosa, 0); |
| 1295 | #endif |
| 1296 | } |
| 1297 | cosa_putdata8(cosa, status); |
| 1298 | #ifdef DEBUG_IO |
| 1299 | debug_data_cmd(cosa, status); |
| 1300 | #endif |
| 1301 | } |
| 1302 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 1303 | } |
| 1304 | |
| 1305 | static void put_driver_status_nolock(struct cosa_data *cosa) |
| 1306 | { |
| 1307 | int status; |
| 1308 | |
| 1309 | status = (cosa->rxbitmap ? DRIVER_RX_READY : 0) |
| 1310 | | (cosa->txbitmap ? DRIVER_TX_READY : 0) |
| 1311 | | (cosa->txbitmap? ~(cosa->txbitmap<<DRIVER_TXMAP_SHIFT) |
| 1312 | &DRIVER_TXMAP_MASK : 0); |
| 1313 | |
| 1314 | if (cosa->rxbitmap|cosa->txbitmap) { |
| 1315 | cosa_putstatus(cosa, SR_RX_INT_ENA); |
| 1316 | #ifdef DEBUG_IO |
| 1317 | debug_status_out(cosa, SR_RX_INT_ENA); |
| 1318 | #endif |
| 1319 | cosa->enabled = 1; |
| 1320 | } else { |
| 1321 | cosa_putstatus(cosa, 0); |
| 1322 | #ifdef DEBUG_IO |
| 1323 | debug_status_out(cosa, 0); |
| 1324 | #endif |
| 1325 | cosa->enabled = 0; |
| 1326 | } |
| 1327 | cosa_putdata8(cosa, status); |
| 1328 | #ifdef DEBUG_IO |
| 1329 | debug_data_cmd(cosa, status); |
| 1330 | #endif |
| 1331 | } |
| 1332 | |
| 1333 | /* |
| 1334 | * The "kickme" function: When the DMA times out, this is called to |
| 1335 | * clean up the driver status. |
| 1336 | * FIXME: Preliminary support, the interface is probably wrong. |
| 1337 | */ |
| 1338 | static void cosa_kick(struct cosa_data *cosa) |
| 1339 | { |
| 1340 | unsigned long flags, flags1; |
| 1341 | char *s = "(probably) IRQ"; |
| 1342 | |
| 1343 | if (test_bit(RXBIT, &cosa->rxtx)) |
| 1344 | s = "RX DMA"; |
| 1345 | if (test_bit(TXBIT, &cosa->rxtx)) |
| 1346 | s = "TX DMA"; |
| 1347 | |
| 1348 | printk(KERN_INFO "%s: %s timeout - restarting.\n", cosa->name, s); |
| 1349 | spin_lock_irqsave(&cosa->lock, flags); |
| 1350 | cosa->rxtx = 0; |
| 1351 | |
| 1352 | flags1 = claim_dma_lock(); |
| 1353 | disable_dma(cosa->dma); |
| 1354 | clear_dma_ff(cosa->dma); |
| 1355 | release_dma_lock(flags1); |
| 1356 | |
| 1357 | /* FIXME: Anything else? */ |
| 1358 | udelay(100); |
| 1359 | cosa_putstatus(cosa, 0); |
| 1360 | udelay(100); |
| 1361 | (void) cosa_getdata8(cosa); |
| 1362 | udelay(100); |
| 1363 | cosa_putdata8(cosa, 0); |
| 1364 | udelay(100); |
| 1365 | put_driver_status_nolock(cosa); |
| 1366 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 1367 | } |
| 1368 | |
| 1369 | /* |
| 1370 | * Check if the whole buffer is DMA-able. It means it is below the 16M of |
| 1371 | * physical memory and doesn't span the 64k boundary. For now it seems |
| 1372 | * SKB's never do this, but we'll check this anyway. |
| 1373 | */ |
| 1374 | static int cosa_dma_able(struct channel_data *chan, char *buf, int len) |
| 1375 | { |
| 1376 | static int count; |
| 1377 | unsigned long b = (unsigned long)buf; |
| 1378 | if (b+len >= MAX_DMA_ADDRESS) |
| 1379 | return 0; |
| 1380 | if ((b^ (b+len)) & 0x10000) { |
| 1381 | if (count++ < 5) |
| 1382 | printk(KERN_INFO "%s: packet spanning a 64k boundary\n", |
| 1383 | chan->name); |
| 1384 | return 0; |
| 1385 | } |
| 1386 | return 1; |
| 1387 | } |
| 1388 | |
| 1389 | |
| 1390 | /* ---------- The SRP/COSA ROM monitor functions ---------- */ |
| 1391 | |
| 1392 | /* |
| 1393 | * Downloading SRP microcode: say "w" to SRP monitor, it answers by "w=", |
| 1394 | * drivers need to say 4-digit hex number meaning start address of the microcode |
| 1395 | * separated by a single space. Monitor replies by saying " =". Now driver |
| 1396 | * has to write 4-digit hex number meaning the last byte address ended |
| 1397 | * by a single space. Monitor has to reply with a space. Now the download |
| 1398 | * begins. After the download monitor replies with "\r\n." (CR LF dot). |
| 1399 | */ |
| 1400 | static int download(struct cosa_data *cosa, const char __user *microcode, int length, int address) |
| 1401 | { |
| 1402 | int i; |
| 1403 | |
| 1404 | if (put_wait_data(cosa, 'w') == -1) return -1; |
| 1405 | if ((i=get_wait_data(cosa)) != 'w') { printk("dnld: 0x%04x\n",i); return -2;} |
| 1406 | if (get_wait_data(cosa) != '=') return -3; |
| 1407 | |
| 1408 | if (puthexnumber(cosa, address) < 0) return -4; |
| 1409 | if (put_wait_data(cosa, ' ') == -1) return -10; |
| 1410 | if (get_wait_data(cosa) != ' ') return -11; |
| 1411 | if (get_wait_data(cosa) != '=') return -12; |
| 1412 | |
| 1413 | if (puthexnumber(cosa, address+length-1) < 0) return -13; |
| 1414 | if (put_wait_data(cosa, ' ') == -1) return -18; |
| 1415 | if (get_wait_data(cosa) != ' ') return -19; |
| 1416 | |
| 1417 | while (length--) { |
| 1418 | char c; |
| 1419 | #ifndef SRP_DOWNLOAD_AT_BOOT |
| 1420 | if (get_user(c, microcode)) |
| 1421 | return -23; /* ??? */ |
| 1422 | #else |
| 1423 | c = *microcode; |
| 1424 | #endif |
| 1425 | if (put_wait_data(cosa, c) == -1) |
| 1426 | return -20; |
| 1427 | microcode++; |
| 1428 | } |
| 1429 | |
| 1430 | if (get_wait_data(cosa) != '\r') return -21; |
| 1431 | if (get_wait_data(cosa) != '\n') return -22; |
| 1432 | if (get_wait_data(cosa) != '.') return -23; |
| 1433 | #if 0 |
| 1434 | printk(KERN_DEBUG "cosa%d: download completed.\n", cosa->num); |
| 1435 | #endif |
| 1436 | return 0; |
| 1437 | } |
| 1438 | |
| 1439 | |
| 1440 | /* |
| 1441 | * Starting microcode is done via the "g" command of the SRP monitor. |
| 1442 | * The chat should be the following: "g" "g=" "<addr><CR>" |
| 1443 | * "<CR><CR><LF><CR><LF>". |
| 1444 | */ |
| 1445 | static int startmicrocode(struct cosa_data *cosa, int address) |
| 1446 | { |
| 1447 | if (put_wait_data(cosa, 'g') == -1) return -1; |
| 1448 | if (get_wait_data(cosa) != 'g') return -2; |
| 1449 | if (get_wait_data(cosa) != '=') return -3; |
| 1450 | |
| 1451 | if (puthexnumber(cosa, address) < 0) return -4; |
| 1452 | if (put_wait_data(cosa, '\r') == -1) return -5; |
| 1453 | |
| 1454 | if (get_wait_data(cosa) != '\r') return -6; |
| 1455 | if (get_wait_data(cosa) != '\r') return -7; |
| 1456 | if (get_wait_data(cosa) != '\n') return -8; |
| 1457 | if (get_wait_data(cosa) != '\r') return -9; |
| 1458 | if (get_wait_data(cosa) != '\n') return -10; |
| 1459 | #if 0 |
| 1460 | printk(KERN_DEBUG "cosa%d: microcode started\n", cosa->num); |
| 1461 | #endif |
| 1462 | return 0; |
| 1463 | } |
| 1464 | |
| 1465 | /* |
| 1466 | * Reading memory is done via the "r" command of the SRP monitor. |
| 1467 | * The chat is the following "r" "r=" "<addr> " " =" "<last_byte> " " " |
| 1468 | * Then driver can read the data and the conversation is finished |
| 1469 | * by SRP monitor sending "<CR><LF>." (dot at the end). |
| 1470 | * |
| 1471 | * This routine is not needed during the normal operation and serves |
| 1472 | * for debugging purposes only. |
| 1473 | */ |
| 1474 | static int readmem(struct cosa_data *cosa, char __user *microcode, int length, int address) |
| 1475 | { |
| 1476 | if (put_wait_data(cosa, 'r') == -1) return -1; |
| 1477 | if ((get_wait_data(cosa)) != 'r') return -2; |
| 1478 | if ((get_wait_data(cosa)) != '=') return -3; |
| 1479 | |
| 1480 | if (puthexnumber(cosa, address) < 0) return -4; |
| 1481 | if (put_wait_data(cosa, ' ') == -1) return -5; |
| 1482 | if (get_wait_data(cosa) != ' ') return -6; |
| 1483 | if (get_wait_data(cosa) != '=') return -7; |
| 1484 | |
| 1485 | if (puthexnumber(cosa, address+length-1) < 0) return -8; |
| 1486 | if (put_wait_data(cosa, ' ') == -1) return -9; |
| 1487 | if (get_wait_data(cosa) != ' ') return -10; |
| 1488 | |
| 1489 | while (length--) { |
| 1490 | char c; |
| 1491 | int i; |
| 1492 | if ((i=get_wait_data(cosa)) == -1) { |
| 1493 | printk (KERN_INFO "cosa: 0x%04x bytes remaining\n", |
| 1494 | length); |
| 1495 | return -11; |
| 1496 | } |
| 1497 | c=i; |
| 1498 | #if 1 |
| 1499 | if (put_user(c, microcode)) |
| 1500 | return -23; /* ??? */ |
| 1501 | #else |
| 1502 | *microcode = c; |
| 1503 | #endif |
| 1504 | microcode++; |
| 1505 | } |
| 1506 | |
| 1507 | if (get_wait_data(cosa) != '\r') return -21; |
| 1508 | if (get_wait_data(cosa) != '\n') return -22; |
| 1509 | if (get_wait_data(cosa) != '.') return -23; |
| 1510 | #if 0 |
| 1511 | printk(KERN_DEBUG "cosa%d: readmem completed.\n", cosa->num); |
| 1512 | #endif |
| 1513 | return 0; |
| 1514 | } |
| 1515 | |
| 1516 | /* |
| 1517 | * This function resets the device and reads the initial prompt |
| 1518 | * of the device's ROM monitor. |
| 1519 | */ |
| 1520 | static int cosa_reset_and_read_id(struct cosa_data *cosa, char *idstring) |
| 1521 | { |
| 1522 | int i=0, id=0, prev=0, curr=0; |
| 1523 | |
| 1524 | /* Reset the card ... */ |
| 1525 | cosa_putstatus(cosa, 0); |
| 1526 | cosa_getdata8(cosa); |
| 1527 | cosa_putstatus(cosa, SR_RST); |
| 1528 | #ifdef MODULE |
| 1529 | msleep(500); |
| 1530 | #else |
| 1531 | udelay(5*100000); |
| 1532 | #endif |
| 1533 | /* Disable all IRQs from the card */ |
| 1534 | cosa_putstatus(cosa, 0); |
| 1535 | |
| 1536 | /* |
| 1537 | * Try to read the ID string. The card then prints out the |
| 1538 | * identification string ended by the "\n\x2e". |
| 1539 | * |
| 1540 | * The following loop is indexed through i (instead of id) |
| 1541 | * to avoid looping forever when for any reason |
| 1542 | * the port returns '\r', '\n' or '\x2e' permanently. |
| 1543 | */ |
| 1544 | for (i=0; i<COSA_MAX_ID_STRING-1; i++, prev=curr) { |
| 1545 | if ((curr = get_wait_data(cosa)) == -1) { |
| 1546 | return -1; |
| 1547 | } |
| 1548 | curr &= 0xff; |
| 1549 | if (curr != '\r' && curr != '\n' && curr != 0x2e) |
| 1550 | idstring[id++] = curr; |
| 1551 | if (curr == 0x2e && prev == '\n') |
| 1552 | break; |
| 1553 | } |
| 1554 | /* Perhaps we should fail when i==COSA_MAX_ID_STRING-1 ? */ |
| 1555 | idstring[id] = '\0'; |
| 1556 | return id; |
| 1557 | } |
| 1558 | |
| 1559 | |
| 1560 | /* ---------- Auxiliary routines for COSA/SRP monitor ---------- */ |
| 1561 | |
| 1562 | /* |
| 1563 | * This routine gets the data byte from the card waiting for the SR_RX_RDY |
| 1564 | * bit to be set in a loop. It should be used in the exceptional cases |
| 1565 | * only (for example when resetting the card or downloading the firmware. |
| 1566 | */ |
| 1567 | static int get_wait_data(struct cosa_data *cosa) |
| 1568 | { |
| 1569 | int retries = 1000; |
| 1570 | |
| 1571 | while (--retries) { |
| 1572 | /* read data and return them */ |
| 1573 | if (cosa_getstatus(cosa) & SR_RX_RDY) { |
| 1574 | short r; |
| 1575 | r = cosa_getdata8(cosa); |
| 1576 | #if 0 |
| 1577 | printk(KERN_INFO "cosa: get_wait_data returning after %d retries\n", 999-retries); |
| 1578 | #endif |
| 1579 | return r; |
| 1580 | } |
| 1581 | /* sleep if not ready to read */ |
Nishanth Aravamudan | 3173c89 | 2005-09-11 02:09:55 -0700 | [diff] [blame] | 1582 | schedule_timeout_interruptible(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | } |
| 1584 | printk(KERN_INFO "cosa: timeout in get_wait_data (status 0x%x)\n", |
| 1585 | cosa_getstatus(cosa)); |
| 1586 | return -1; |
| 1587 | } |
| 1588 | |
| 1589 | /* |
| 1590 | * This routine puts the data byte to the card waiting for the SR_TX_RDY |
| 1591 | * bit to be set in a loop. It should be used in the exceptional cases |
| 1592 | * only (for example when resetting the card or downloading the firmware). |
| 1593 | */ |
| 1594 | static int put_wait_data(struct cosa_data *cosa, int data) |
| 1595 | { |
| 1596 | int retries = 1000; |
| 1597 | while (--retries) { |
| 1598 | /* read data and return them */ |
| 1599 | if (cosa_getstatus(cosa) & SR_TX_RDY) { |
| 1600 | cosa_putdata8(cosa, data); |
| 1601 | #if 0 |
| 1602 | printk(KERN_INFO "Putdata: %d retries\n", 999-retries); |
| 1603 | #endif |
| 1604 | return 0; |
| 1605 | } |
| 1606 | #if 0 |
| 1607 | /* sleep if not ready to read */ |
Nishanth Aravamudan | 3173c89 | 2005-09-11 02:09:55 -0700 | [diff] [blame] | 1608 | schedule_timeout_interruptible(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | #endif |
| 1610 | } |
| 1611 | printk(KERN_INFO "cosa%d: timeout in put_wait_data (status 0x%x)\n", |
| 1612 | cosa->num, cosa_getstatus(cosa)); |
| 1613 | return -1; |
| 1614 | } |
| 1615 | |
| 1616 | /* |
| 1617 | * The following routine puts the hexadecimal number into the SRP monitor |
| 1618 | * and verifies the proper echo of the sent bytes. Returns 0 on success, |
| 1619 | * negative number on failure (-1,-3,-5,-7) means that put_wait_data() failed, |
| 1620 | * (-2,-4,-6,-8) means that reading echo failed. |
| 1621 | */ |
| 1622 | static int puthexnumber(struct cosa_data *cosa, int number) |
| 1623 | { |
| 1624 | char temp[5]; |
| 1625 | int i; |
| 1626 | |
| 1627 | /* Well, I should probably replace this by something faster. */ |
| 1628 | sprintf(temp, "%04X", number); |
| 1629 | for (i=0; i<4; i++) { |
| 1630 | if (put_wait_data(cosa, temp[i]) == -1) { |
| 1631 | printk(KERN_NOTICE "cosa%d: puthexnumber failed to write byte %d\n", |
| 1632 | cosa->num, i); |
| 1633 | return -1-2*i; |
| 1634 | } |
| 1635 | if (get_wait_data(cosa) != temp[i]) { |
| 1636 | printk(KERN_NOTICE "cosa%d: puthexhumber failed to read echo of byte %d\n", |
| 1637 | cosa->num, i); |
| 1638 | return -2-2*i; |
| 1639 | } |
| 1640 | } |
| 1641 | return 0; |
| 1642 | } |
| 1643 | |
| 1644 | |
| 1645 | /* ---------- Interrupt routines ---------- */ |
| 1646 | |
| 1647 | /* |
| 1648 | * There are three types of interrupt: |
| 1649 | * At the beginning of transmit - this handled is in tx_interrupt(), |
| 1650 | * at the beginning of receive - it is in rx_interrupt() and |
| 1651 | * at the end of transmit/receive - it is the eot_interrupt() function. |
| 1652 | * These functions are multiplexed by cosa_interrupt() according to the |
| 1653 | * COSA status byte. I have moved the rx/tx/eot interrupt handling into |
| 1654 | * separate functions to make it more readable. These functions are inline, |
| 1655 | * so there should be no overhead of function call. |
| 1656 | * |
| 1657 | * In the COSA bus-master mode, we need to tell the card the address of a |
| 1658 | * buffer. Unfortunately, COSA may be too slow for us, so we must busy-wait. |
| 1659 | * It's time to use the bottom half :-( |
| 1660 | */ |
| 1661 | |
| 1662 | /* |
| 1663 | * Transmit interrupt routine - called when COSA is willing to obtain |
| 1664 | * data from the OS. The most tricky part of the routine is selection |
| 1665 | * of channel we (OS) want to send packet for. For SRP we should probably |
| 1666 | * use the round-robin approach. The newer COSA firmwares have a simple |
| 1667 | * flow-control - in the status word has bits 2 and 3 set to 1 means that the |
| 1668 | * channel 0 or 1 doesn't want to receive data. |
| 1669 | * |
| 1670 | * It seems there is a bug in COSA firmware (need to trace it further): |
| 1671 | * When the driver status says that the kernel has no more data for transmit |
| 1672 | * (e.g. at the end of TX DMA) and then the kernel changes its mind |
| 1673 | * (e.g. new packet is queued to hard_start_xmit()), the card issues |
| 1674 | * the TX interrupt but does not mark the channel as ready-to-transmit. |
| 1675 | * The fix seems to be to push the packet to COSA despite its request. |
| 1676 | * We first try to obey the card's opinion, and then fall back to forced TX. |
| 1677 | */ |
| 1678 | static inline void tx_interrupt(struct cosa_data *cosa, int status) |
| 1679 | { |
| 1680 | unsigned long flags, flags1; |
| 1681 | #ifdef DEBUG_IRQS |
| 1682 | printk(KERN_INFO "cosa%d: SR_DOWN_REQUEST status=0x%04x\n", |
| 1683 | cosa->num, status); |
| 1684 | #endif |
| 1685 | spin_lock_irqsave(&cosa->lock, flags); |
| 1686 | set_bit(TXBIT, &cosa->rxtx); |
| 1687 | if (!test_bit(IRQBIT, &cosa->rxtx)) { |
| 1688 | /* flow control, see the comment above */ |
| 1689 | int i=0; |
| 1690 | if (!cosa->txbitmap) { |
| 1691 | printk(KERN_WARNING "%s: No channel wants data " |
| 1692 | "in TX IRQ. Expect DMA timeout.", |
| 1693 | cosa->name); |
| 1694 | put_driver_status_nolock(cosa); |
| 1695 | clear_bit(TXBIT, &cosa->rxtx); |
| 1696 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 1697 | return; |
| 1698 | } |
| 1699 | while(1) { |
| 1700 | cosa->txchan++; |
| 1701 | i++; |
| 1702 | if (cosa->txchan >= cosa->nchannels) |
| 1703 | cosa->txchan = 0; |
| 1704 | if (!(cosa->txbitmap & (1<<cosa->txchan))) |
| 1705 | continue; |
| 1706 | if (~status & (1 << (cosa->txchan+DRIVER_TXMAP_SHIFT))) |
| 1707 | break; |
| 1708 | /* in second pass, accept first ready-to-TX channel */ |
| 1709 | if (i > cosa->nchannels) { |
| 1710 | /* Can be safely ignored */ |
| 1711 | #ifdef DEBUG_IRQS |
| 1712 | printk(KERN_DEBUG "%s: Forcing TX " |
| 1713 | "to not-ready channel %d\n", |
| 1714 | cosa->name, cosa->txchan); |
| 1715 | #endif |
| 1716 | break; |
| 1717 | } |
| 1718 | } |
| 1719 | |
| 1720 | cosa->txsize = cosa->chan[cosa->txchan].txsize; |
| 1721 | if (cosa_dma_able(cosa->chan+cosa->txchan, |
| 1722 | cosa->chan[cosa->txchan].txbuf, cosa->txsize)) { |
| 1723 | cosa->txbuf = cosa->chan[cosa->txchan].txbuf; |
| 1724 | } else { |
| 1725 | memcpy(cosa->bouncebuf, cosa->chan[cosa->txchan].txbuf, |
| 1726 | cosa->txsize); |
| 1727 | cosa->txbuf = cosa->bouncebuf; |
| 1728 | } |
| 1729 | } |
| 1730 | |
| 1731 | if (is_8bit(cosa)) { |
| 1732 | if (!test_bit(IRQBIT, &cosa->rxtx)) { |
| 1733 | cosa_putstatus(cosa, SR_TX_INT_ENA); |
| 1734 | cosa_putdata8(cosa, ((cosa->txchan << 5) & 0xe0)| |
| 1735 | ((cosa->txsize >> 8) & 0x1f)); |
| 1736 | #ifdef DEBUG_IO |
| 1737 | debug_status_out(cosa, SR_TX_INT_ENA); |
| 1738 | debug_data_out(cosa, ((cosa->txchan << 5) & 0xe0)| |
| 1739 | ((cosa->txsize >> 8) & 0x1f)); |
| 1740 | debug_data_in(cosa, cosa_getdata8(cosa)); |
| 1741 | #else |
| 1742 | cosa_getdata8(cosa); |
| 1743 | #endif |
| 1744 | set_bit(IRQBIT, &cosa->rxtx); |
| 1745 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 1746 | return; |
| 1747 | } else { |
| 1748 | clear_bit(IRQBIT, &cosa->rxtx); |
| 1749 | cosa_putstatus(cosa, 0); |
| 1750 | cosa_putdata8(cosa, cosa->txsize&0xff); |
| 1751 | #ifdef DEBUG_IO |
| 1752 | debug_status_out(cosa, 0); |
| 1753 | debug_data_out(cosa, cosa->txsize&0xff); |
| 1754 | #endif |
| 1755 | } |
| 1756 | } else { |
| 1757 | cosa_putstatus(cosa, SR_TX_INT_ENA); |
| 1758 | cosa_putdata16(cosa, ((cosa->txchan<<13) & 0xe000) |
| 1759 | | (cosa->txsize & 0x1fff)); |
| 1760 | #ifdef DEBUG_IO |
| 1761 | debug_status_out(cosa, SR_TX_INT_ENA); |
| 1762 | debug_data_out(cosa, ((cosa->txchan<<13) & 0xe000) |
| 1763 | | (cosa->txsize & 0x1fff)); |
| 1764 | debug_data_in(cosa, cosa_getdata8(cosa)); |
| 1765 | debug_status_out(cosa, 0); |
| 1766 | #else |
| 1767 | cosa_getdata8(cosa); |
| 1768 | #endif |
| 1769 | cosa_putstatus(cosa, 0); |
| 1770 | } |
| 1771 | |
| 1772 | if (cosa->busmaster) { |
| 1773 | unsigned long addr = virt_to_bus(cosa->txbuf); |
| 1774 | int count=0; |
| 1775 | printk(KERN_INFO "busmaster IRQ\n"); |
| 1776 | while (!(cosa_getstatus(cosa)&SR_TX_RDY)) { |
| 1777 | count++; |
| 1778 | udelay(10); |
| 1779 | if (count > 1000) break; |
| 1780 | } |
| 1781 | printk(KERN_INFO "status %x\n", cosa_getstatus(cosa)); |
| 1782 | printk(KERN_INFO "ready after %d loops\n", count); |
| 1783 | cosa_putdata16(cosa, (addr >> 16)&0xffff); |
| 1784 | |
| 1785 | count = 0; |
| 1786 | while (!(cosa_getstatus(cosa)&SR_TX_RDY)) { |
| 1787 | count++; |
| 1788 | if (count > 1000) break; |
| 1789 | udelay(10); |
| 1790 | } |
| 1791 | printk(KERN_INFO "ready after %d loops\n", count); |
| 1792 | cosa_putdata16(cosa, addr &0xffff); |
| 1793 | flags1 = claim_dma_lock(); |
| 1794 | set_dma_mode(cosa->dma, DMA_MODE_CASCADE); |
| 1795 | enable_dma(cosa->dma); |
| 1796 | release_dma_lock(flags1); |
| 1797 | } else { |
| 1798 | /* start the DMA */ |
| 1799 | flags1 = claim_dma_lock(); |
| 1800 | disable_dma(cosa->dma); |
| 1801 | clear_dma_ff(cosa->dma); |
| 1802 | set_dma_mode(cosa->dma, DMA_MODE_WRITE); |
| 1803 | set_dma_addr(cosa->dma, virt_to_bus(cosa->txbuf)); |
| 1804 | set_dma_count(cosa->dma, cosa->txsize); |
| 1805 | enable_dma(cosa->dma); |
| 1806 | release_dma_lock(flags1); |
| 1807 | } |
| 1808 | cosa_putstatus(cosa, SR_TX_DMA_ENA|SR_USR_INT_ENA); |
| 1809 | #ifdef DEBUG_IO |
| 1810 | debug_status_out(cosa, SR_TX_DMA_ENA|SR_USR_INT_ENA); |
| 1811 | #endif |
| 1812 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 1813 | } |
| 1814 | |
| 1815 | static inline void rx_interrupt(struct cosa_data *cosa, int status) |
| 1816 | { |
| 1817 | unsigned long flags; |
| 1818 | #ifdef DEBUG_IRQS |
| 1819 | printk(KERN_INFO "cosa%d: SR_UP_REQUEST\n", cosa->num); |
| 1820 | #endif |
| 1821 | |
| 1822 | spin_lock_irqsave(&cosa->lock, flags); |
| 1823 | set_bit(RXBIT, &cosa->rxtx); |
| 1824 | |
| 1825 | if (is_8bit(cosa)) { |
| 1826 | if (!test_bit(IRQBIT, &cosa->rxtx)) { |
| 1827 | set_bit(IRQBIT, &cosa->rxtx); |
| 1828 | put_driver_status_nolock(cosa); |
| 1829 | cosa->rxsize = cosa_getdata8(cosa) <<8; |
| 1830 | #ifdef DEBUG_IO |
| 1831 | debug_data_in(cosa, cosa->rxsize >> 8); |
| 1832 | #endif |
| 1833 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 1834 | return; |
| 1835 | } else { |
| 1836 | clear_bit(IRQBIT, &cosa->rxtx); |
| 1837 | cosa->rxsize |= cosa_getdata8(cosa) & 0xff; |
| 1838 | #ifdef DEBUG_IO |
| 1839 | debug_data_in(cosa, cosa->rxsize & 0xff); |
| 1840 | #endif |
| 1841 | #if 0 |
| 1842 | printk(KERN_INFO "cosa%d: receive rxsize = (0x%04x).\n", |
| 1843 | cosa->num, cosa->rxsize); |
| 1844 | #endif |
| 1845 | } |
| 1846 | } else { |
| 1847 | cosa->rxsize = cosa_getdata16(cosa); |
| 1848 | #ifdef DEBUG_IO |
| 1849 | debug_data_in(cosa, cosa->rxsize); |
| 1850 | #endif |
| 1851 | #if 0 |
| 1852 | printk(KERN_INFO "cosa%d: receive rxsize = (0x%04x).\n", |
| 1853 | cosa->num, cosa->rxsize); |
| 1854 | #endif |
| 1855 | } |
| 1856 | if (((cosa->rxsize & 0xe000) >> 13) >= cosa->nchannels) { |
| 1857 | printk(KERN_WARNING "%s: rx for unknown channel (0x%04x)\n", |
| 1858 | cosa->name, cosa->rxsize); |
| 1859 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 1860 | goto reject; |
| 1861 | } |
| 1862 | cosa->rxchan = cosa->chan + ((cosa->rxsize & 0xe000) >> 13); |
| 1863 | cosa->rxsize &= 0x1fff; |
| 1864 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 1865 | |
| 1866 | cosa->rxbuf = NULL; |
| 1867 | if (cosa->rxchan->setup_rx) |
| 1868 | cosa->rxbuf = cosa->rxchan->setup_rx(cosa->rxchan, cosa->rxsize); |
| 1869 | |
| 1870 | if (!cosa->rxbuf) { |
| 1871 | reject: /* Reject the packet */ |
| 1872 | printk(KERN_INFO "cosa%d: rejecting packet on channel %d\n", |
| 1873 | cosa->num, cosa->rxchan->num); |
| 1874 | cosa->rxbuf = cosa->bouncebuf; |
| 1875 | } |
| 1876 | |
| 1877 | /* start the DMA */ |
| 1878 | flags = claim_dma_lock(); |
| 1879 | disable_dma(cosa->dma); |
| 1880 | clear_dma_ff(cosa->dma); |
| 1881 | set_dma_mode(cosa->dma, DMA_MODE_READ); |
| 1882 | if (cosa_dma_able(cosa->rxchan, cosa->rxbuf, cosa->rxsize & 0x1fff)) { |
| 1883 | set_dma_addr(cosa->dma, virt_to_bus(cosa->rxbuf)); |
| 1884 | } else { |
| 1885 | set_dma_addr(cosa->dma, virt_to_bus(cosa->bouncebuf)); |
| 1886 | } |
| 1887 | set_dma_count(cosa->dma, (cosa->rxsize&0x1fff)); |
| 1888 | enable_dma(cosa->dma); |
| 1889 | release_dma_lock(flags); |
| 1890 | spin_lock_irqsave(&cosa->lock, flags); |
| 1891 | cosa_putstatus(cosa, SR_RX_DMA_ENA|SR_USR_INT_ENA); |
| 1892 | if (!is_8bit(cosa) && (status & SR_TX_RDY)) |
| 1893 | cosa_putdata8(cosa, DRIVER_RX_READY); |
| 1894 | #ifdef DEBUG_IO |
| 1895 | debug_status_out(cosa, SR_RX_DMA_ENA|SR_USR_INT_ENA); |
| 1896 | if (!is_8bit(cosa) && (status & SR_TX_RDY)) |
| 1897 | debug_data_cmd(cosa, DRIVER_RX_READY); |
| 1898 | #endif |
| 1899 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 1900 | } |
| 1901 | |
| 1902 | static inline void eot_interrupt(struct cosa_data *cosa, int status) |
| 1903 | { |
| 1904 | unsigned long flags, flags1; |
| 1905 | spin_lock_irqsave(&cosa->lock, flags); |
| 1906 | flags1 = claim_dma_lock(); |
| 1907 | disable_dma(cosa->dma); |
| 1908 | clear_dma_ff(cosa->dma); |
| 1909 | release_dma_lock(flags1); |
| 1910 | if (test_bit(TXBIT, &cosa->rxtx)) { |
| 1911 | struct channel_data *chan = cosa->chan+cosa->txchan; |
| 1912 | if (chan->tx_done) |
| 1913 | if (chan->tx_done(chan, cosa->txsize)) |
| 1914 | clear_bit(chan->num, &cosa->txbitmap); |
| 1915 | } else if (test_bit(RXBIT, &cosa->rxtx)) { |
| 1916 | #ifdef DEBUG_DATA |
| 1917 | { |
| 1918 | int i; |
| 1919 | printk(KERN_INFO "cosa%dc%d: done rx(0x%x)", cosa->num, |
| 1920 | cosa->rxchan->num, cosa->rxsize); |
| 1921 | for (i=0; i<cosa->rxsize; i++) |
| 1922 | printk (" %02x", cosa->rxbuf[i]&0xff); |
| 1923 | printk("\n"); |
| 1924 | } |
| 1925 | #endif |
| 1926 | /* Packet for unknown channel? */ |
| 1927 | if (cosa->rxbuf == cosa->bouncebuf) |
| 1928 | goto out; |
| 1929 | if (!cosa_dma_able(cosa->rxchan, cosa->rxbuf, cosa->rxsize)) |
| 1930 | memcpy(cosa->rxbuf, cosa->bouncebuf, cosa->rxsize); |
| 1931 | if (cosa->rxchan->rx_done) |
| 1932 | if (cosa->rxchan->rx_done(cosa->rxchan)) |
| 1933 | clear_bit(cosa->rxchan->num, &cosa->rxbitmap); |
| 1934 | } else { |
| 1935 | printk(KERN_NOTICE "cosa%d: unexpected EOT interrupt\n", |
| 1936 | cosa->num); |
| 1937 | } |
| 1938 | /* |
| 1939 | * Clear the RXBIT, TXBIT and IRQBIT (the latest should be |
| 1940 | * cleared anyway). We should do it as soon as possible |
| 1941 | * so that we can tell the COSA we are done and to give it a time |
| 1942 | * for recovery. |
| 1943 | */ |
| 1944 | out: |
| 1945 | cosa->rxtx = 0; |
| 1946 | put_driver_status_nolock(cosa); |
| 1947 | spin_unlock_irqrestore(&cosa->lock, flags); |
| 1948 | } |
| 1949 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1950 | static irqreturn_t cosa_interrupt(int irq, void *cosa_) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1951 | { |
| 1952 | unsigned status; |
| 1953 | int count = 0; |
| 1954 | struct cosa_data *cosa = cosa_; |
| 1955 | again: |
| 1956 | status = cosa_getstatus(cosa); |
| 1957 | #ifdef DEBUG_IRQS |
| 1958 | printk(KERN_INFO "cosa%d: got IRQ, status 0x%02x\n", cosa->num, |
| 1959 | status & 0xff); |
| 1960 | #endif |
| 1961 | #ifdef DEBUG_IO |
| 1962 | debug_status_in(cosa, status); |
| 1963 | #endif |
| 1964 | switch (status & SR_CMD_FROM_SRP_MASK) { |
| 1965 | case SR_DOWN_REQUEST: |
| 1966 | tx_interrupt(cosa, status); |
| 1967 | break; |
| 1968 | case SR_UP_REQUEST: |
| 1969 | rx_interrupt(cosa, status); |
| 1970 | break; |
| 1971 | case SR_END_OF_TRANSFER: |
| 1972 | eot_interrupt(cosa, status); |
| 1973 | break; |
| 1974 | default: |
| 1975 | /* We may be too fast for SRP. Try to wait a bit more. */ |
| 1976 | if (count++ < 100) { |
| 1977 | udelay(100); |
| 1978 | goto again; |
| 1979 | } |
| 1980 | printk(KERN_INFO "cosa%d: unknown status 0x%02x in IRQ after %d retries\n", |
| 1981 | cosa->num, status & 0xff, count); |
| 1982 | } |
| 1983 | #ifdef DEBUG_IRQS |
| 1984 | if (count) |
| 1985 | printk(KERN_INFO "%s: %d-times got unknown status in IRQ\n", |
| 1986 | cosa->name, count); |
| 1987 | else |
| 1988 | printk(KERN_INFO "%s: returning from IRQ\n", cosa->name); |
| 1989 | #endif |
| 1990 | return IRQ_HANDLED; |
| 1991 | } |
| 1992 | |
| 1993 | |
| 1994 | /* ---------- I/O debugging routines ---------- */ |
| 1995 | /* |
| 1996 | * These routines can be used to monitor COSA/SRP I/O and to printk() |
| 1997 | * the data being transferred on the data and status I/O port in a |
| 1998 | * readable way. |
| 1999 | */ |
| 2000 | |
| 2001 | #ifdef DEBUG_IO |
| 2002 | static void debug_status_in(struct cosa_data *cosa, int status) |
| 2003 | { |
| 2004 | char *s; |
| 2005 | switch(status & SR_CMD_FROM_SRP_MASK) { |
| 2006 | case SR_UP_REQUEST: |
| 2007 | s = "RX_REQ"; |
| 2008 | break; |
| 2009 | case SR_DOWN_REQUEST: |
| 2010 | s = "TX_REQ"; |
| 2011 | break; |
| 2012 | case SR_END_OF_TRANSFER: |
| 2013 | s = "ET_REQ"; |
| 2014 | break; |
| 2015 | default: |
| 2016 | s = "NO_REQ"; |
| 2017 | break; |
| 2018 | } |
| 2019 | printk(KERN_INFO "%s: IO: status -> 0x%02x (%s%s%s%s)\n", |
| 2020 | cosa->name, |
| 2021 | status, |
| 2022 | status & SR_USR_RQ ? "USR_RQ|":"", |
| 2023 | status & SR_TX_RDY ? "TX_RDY|":"", |
| 2024 | status & SR_RX_RDY ? "RX_RDY|":"", |
| 2025 | s); |
| 2026 | } |
| 2027 | |
| 2028 | static void debug_status_out(struct cosa_data *cosa, int status) |
| 2029 | { |
| 2030 | printk(KERN_INFO "%s: IO: status <- 0x%02x (%s%s%s%s%s%s)\n", |
| 2031 | cosa->name, |
| 2032 | status, |
| 2033 | status & SR_RX_DMA_ENA ? "RXDMA|":"!rxdma|", |
| 2034 | status & SR_TX_DMA_ENA ? "TXDMA|":"!txdma|", |
| 2035 | status & SR_RST ? "RESET|":"", |
| 2036 | status & SR_USR_INT_ENA ? "USRINT|":"!usrint|", |
| 2037 | status & SR_TX_INT_ENA ? "TXINT|":"!txint|", |
| 2038 | status & SR_RX_INT_ENA ? "RXINT":"!rxint"); |
| 2039 | } |
| 2040 | |
| 2041 | static void debug_data_in(struct cosa_data *cosa, int data) |
| 2042 | { |
| 2043 | printk(KERN_INFO "%s: IO: data -> 0x%04x\n", cosa->name, data); |
| 2044 | } |
| 2045 | |
| 2046 | static void debug_data_out(struct cosa_data *cosa, int data) |
| 2047 | { |
| 2048 | printk(KERN_INFO "%s: IO: data <- 0x%04x\n", cosa->name, data); |
| 2049 | } |
| 2050 | |
| 2051 | static void debug_data_cmd(struct cosa_data *cosa, int data) |
| 2052 | { |
| 2053 | printk(KERN_INFO "%s: IO: data <- 0x%04x (%s|%s)\n", |
| 2054 | cosa->name, data, |
| 2055 | data & SR_RDY_RCV ? "RX_RDY" : "!rx_rdy", |
| 2056 | data & SR_RDY_SND ? "TX_RDY" : "!tx_rdy"); |
| 2057 | } |
| 2058 | #endif |
| 2059 | |
| 2060 | /* EOF -- this file has not been truncated */ |