1 /* 2 * Linux ARCnet driver - "RIM I" (entirely mem-mapped) cards 3 * 4 * Written 1994-1999 by Avery Pennarun. 5 * Written 1999-2000 by Martin Mares <mj@ucw.cz>. 6 * Derived from skeleton.c by Donald Becker. 7 * 8 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com) 9 * for sponsoring the further development of this driver. 10 * 11 * ********************** 12 * 13 * The original copyright of skeleton.c was as follows: 14 * 15 * skeleton.c Written 1993 by Donald Becker. 16 * Copyright 1993 United States Government as represented by the 17 * Director, National Security Agency. This software may only be used 18 * and distributed according to the terms of the GNU General Public License as 19 * modified by SRC, incorporated herein by reference. 20 * 21 * ********************** 22 * 23 * For more details, see drivers/net/arcnet.c 24 * 25 * ********************** 26 */ 27 28 #define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt 29 30 #include <linux/kernel.h> 31 #include <linux/module.h> 32 #include <linux/moduleparam.h> 33 #include <linux/ioport.h> 34 #include <linux/delay.h> 35 #include <linux/netdevice.h> 36 #include <linux/memblock.h> 37 #include <linux/init.h> 38 #include <linux/interrupt.h> 39 #include <linux/io.h> 40 41 #include "arcdevice.h" 42 #include "com9026.h" 43 44 /* Internal function declarations */ 45 46 static int arcrimi_probe(struct net_device *dev); 47 static int arcrimi_found(struct net_device *dev); 48 static void arcrimi_command(struct net_device *dev, int command); 49 static int arcrimi_status(struct net_device *dev); 50 static void arcrimi_setmask(struct net_device *dev, int mask); 51 static int arcrimi_reset(struct net_device *dev, int really_reset); 52 static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset, 53 void *buf, int count); 54 static void arcrimi_copy_from_card(struct net_device *dev, int bufnum, 55 int offset, void *buf, int count); 56 57 /* Handy defines for ARCnet specific stuff */ 58 59 /* Amount of I/O memory used by the card */ 60 #define BUFFER_SIZE (512) 61 #define MIRROR_SIZE (BUFFER_SIZE * 4) 62 63 /* We cannot probe for a RIM I card; one reason is I don't know how to reset 64 * them. In fact, we can't even get their node ID automatically. So, we 65 * need to be passed a specific shmem address, IRQ, and node ID. 66 */ 67 static int __init arcrimi_probe(struct net_device *dev) 68 { 69 if (BUGLVL(D_NORMAL)) { 70 pr_info("%s\n", "RIM I (entirely mem-mapped) support"); 71 pr_info("E-mail me if you actually test the RIM I driver, please!\n"); 72 pr_info("Given: node %02Xh, shmem %lXh, irq %d\n", 73 dev->dev_addr[0], dev->mem_start, dev->irq); 74 } 75 76 if (dev->mem_start <= 0 || dev->irq <= 0) { 77 if (BUGLVL(D_NORMAL)) 78 pr_err("No autoprobe for RIM I; you must specify the shmem and irq!\n"); 79 return -ENODEV; 80 } 81 if (dev->dev_addr[0] == 0) { 82 if (BUGLVL(D_NORMAL)) 83 pr_err("You need to specify your card's station ID!\n"); 84 return -ENODEV; 85 } 86 /* Grab the memory region at mem_start for MIRROR_SIZE bytes. 87 * Later in arcrimi_found() the real size will be determined 88 * and this reserve will be released and the correct size 89 * will be taken. 90 */ 91 if (!request_mem_region(dev->mem_start, MIRROR_SIZE, "arcnet (90xx)")) { 92 if (BUGLVL(D_NORMAL)) 93 pr_notice("Card memory already allocated\n"); 94 return -ENODEV; 95 } 96 return arcrimi_found(dev); 97 } 98 99 static int check_mirror(unsigned long addr, size_t size) 100 { 101 void __iomem *p; 102 int res = -1; 103 104 if (!request_mem_region(addr, size, "arcnet (90xx)")) 105 return -1; 106 107 p = ioremap(addr, size); 108 if (p) { 109 if (arcnet_readb(p, COM9026_REG_R_STATUS) == TESTvalue) 110 res = 1; 111 else 112 res = 0; 113 iounmap(p); 114 } 115 116 release_mem_region(addr, size); 117 return res; 118 } 119 120 /* Set up the struct net_device associated with this card. 121 * Called after probing succeeds. 122 */ 123 static int __init arcrimi_found(struct net_device *dev) 124 { 125 struct arcnet_local *lp; 126 unsigned long first_mirror, last_mirror, shmem; 127 void __iomem *p; 128 int mirror_size; 129 int err; 130 131 p = ioremap(dev->mem_start, MIRROR_SIZE); 132 if (!p) { 133 release_mem_region(dev->mem_start, MIRROR_SIZE); 134 arc_printk(D_NORMAL, dev, "Can't ioremap\n"); 135 return -ENODEV; 136 } 137 138 /* reserve the irq */ 139 if (request_irq(dev->irq, arcnet_interrupt, 0, "arcnet (RIM I)", dev)) { 140 iounmap(p); 141 release_mem_region(dev->mem_start, MIRROR_SIZE); 142 arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", dev->irq); 143 return -ENODEV; 144 } 145 146 shmem = dev->mem_start; 147 arcnet_writeb(TESTvalue, p, COM9026_REG_W_INTMASK); 148 arcnet_writeb(TESTvalue, p, COM9026_REG_W_COMMAND); 149 /* actually the station/node ID */ 150 151 /* find the real shared memory start/end points, including mirrors */ 152 153 /* guess the actual size of one "memory mirror" - the number of 154 * bytes between copies of the shared memory. On most cards, it's 155 * 2k (or there are no mirrors at all) but on some, it's 4k. 156 */ 157 mirror_size = MIRROR_SIZE; 158 if (arcnet_readb(p, COM9026_REG_R_STATUS) == TESTvalue && 159 check_mirror(shmem - MIRROR_SIZE, MIRROR_SIZE) == 0 && 160 check_mirror(shmem - 2 * MIRROR_SIZE, MIRROR_SIZE) == 1) 161 mirror_size = 2 * MIRROR_SIZE; 162 163 first_mirror = shmem - mirror_size; 164 while (check_mirror(first_mirror, mirror_size) == 1) 165 first_mirror -= mirror_size; 166 first_mirror += mirror_size; 167 168 last_mirror = shmem + mirror_size; 169 while (check_mirror(last_mirror, mirror_size) == 1) 170 last_mirror += mirror_size; 171 last_mirror -= mirror_size; 172 173 dev->mem_start = first_mirror; 174 dev->mem_end = last_mirror + MIRROR_SIZE - 1; 175 176 /* initialize the rest of the device structure. */ 177 178 lp = netdev_priv(dev); 179 lp->card_name = "RIM I"; 180 lp->hw.command = arcrimi_command; 181 lp->hw.status = arcrimi_status; 182 lp->hw.intmask = arcrimi_setmask; 183 lp->hw.reset = arcrimi_reset; 184 lp->hw.owner = THIS_MODULE; 185 lp->hw.copy_to_card = arcrimi_copy_to_card; 186 lp->hw.copy_from_card = arcrimi_copy_from_card; 187 188 /* re-reserve the memory region - arcrimi_probe() alloced this reqion 189 * but didn't know the real size. Free that region and then re-get 190 * with the correct size. There is a VERY slim chance this could 191 * fail. 192 */ 193 iounmap(p); 194 release_mem_region(shmem, MIRROR_SIZE); 195 if (!request_mem_region(dev->mem_start, 196 dev->mem_end - dev->mem_start + 1, 197 "arcnet (90xx)")) { 198 arc_printk(D_NORMAL, dev, "Card memory already allocated\n"); 199 goto err_free_irq; 200 } 201 202 lp->mem_start = ioremap(dev->mem_start, 203 dev->mem_end - dev->mem_start + 1); 204 if (!lp->mem_start) { 205 arc_printk(D_NORMAL, dev, "Can't remap device memory!\n"); 206 goto err_release_mem; 207 } 208 209 /* get and check the station ID from offset 1 in shmem */ 210 dev->dev_addr[0] = arcnet_readb(lp->mem_start, COM9026_REG_R_STATION); 211 212 arc_printk(D_NORMAL, dev, "ARCnet RIM I: station %02Xh found at IRQ %d, ShMem %lXh (%ld*%d bytes)\n", 213 dev->dev_addr[0], 214 dev->irq, dev->mem_start, 215 (dev->mem_end - dev->mem_start + 1) / mirror_size, 216 mirror_size); 217 218 err = register_netdev(dev); 219 if (err) 220 goto err_unmap; 221 222 return 0; 223 224 err_unmap: 225 iounmap(lp->mem_start); 226 err_release_mem: 227 release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1); 228 err_free_irq: 229 free_irq(dev->irq, dev); 230 return -EIO; 231 } 232 233 /* Do a hardware reset on the card, and set up necessary registers. 234 * 235 * This should be called as little as possible, because it disrupts the 236 * token on the network (causes a RECON) and requires a significant delay. 237 * 238 * However, it does make sure the card is in a defined state. 239 */ 240 static int arcrimi_reset(struct net_device *dev, int really_reset) 241 { 242 struct arcnet_local *lp = netdev_priv(dev); 243 void __iomem *ioaddr = lp->mem_start + 0x800; 244 245 arc_printk(D_INIT, dev, "Resetting %s (status=%02Xh)\n", 246 dev->name, arcnet_readb(ioaddr, COM9026_REG_R_STATUS)); 247 248 if (really_reset) { 249 arcnet_writeb(TESTvalue, ioaddr, -0x800); /* fake reset */ 250 return 0; 251 } 252 /* clear flags & end reset */ 253 arcnet_writeb(CFLAGScmd | RESETclear, ioaddr, COM9026_REG_W_COMMAND); 254 arcnet_writeb(CFLAGScmd | CONFIGclear, ioaddr, COM9026_REG_W_COMMAND); 255 256 /* enable extended (512-byte) packets */ 257 arcnet_writeb(CONFIGcmd | EXTconf, ioaddr, COM9026_REG_W_COMMAND); 258 259 /* done! return success. */ 260 return 0; 261 } 262 263 static void arcrimi_setmask(struct net_device *dev, int mask) 264 { 265 struct arcnet_local *lp = netdev_priv(dev); 266 void __iomem *ioaddr = lp->mem_start + 0x800; 267 268 arcnet_writeb(mask, ioaddr, COM9026_REG_W_INTMASK); 269 } 270 271 static int arcrimi_status(struct net_device *dev) 272 { 273 struct arcnet_local *lp = netdev_priv(dev); 274 void __iomem *ioaddr = lp->mem_start + 0x800; 275 276 return arcnet_readb(ioaddr, COM9026_REG_R_STATUS); 277 } 278 279 static void arcrimi_command(struct net_device *dev, int cmd) 280 { 281 struct arcnet_local *lp = netdev_priv(dev); 282 void __iomem *ioaddr = lp->mem_start + 0x800; 283 284 arcnet_writeb(cmd, ioaddr, COM9026_REG_W_COMMAND); 285 } 286 287 static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset, 288 void *buf, int count) 289 { 290 struct arcnet_local *lp = netdev_priv(dev); 291 void __iomem *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset; 292 293 TIME(dev, "memcpy_toio", count, memcpy_toio(memaddr, buf, count)); 294 } 295 296 static void arcrimi_copy_from_card(struct net_device *dev, int bufnum, 297 int offset, void *buf, int count) 298 { 299 struct arcnet_local *lp = netdev_priv(dev); 300 void __iomem *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset; 301 302 TIME(dev, "memcpy_fromio", count, memcpy_fromio(buf, memaddr, count)); 303 } 304 305 static int node; 306 static int io; /* use the insmod io= irq= node= options */ 307 static int irq; 308 static char device[9]; /* use eg. device=arc1 to change name */ 309 310 module_param(node, int, 0); 311 module_param(io, int, 0); 312 module_param(irq, int, 0); 313 module_param_string(device, device, sizeof(device), 0); 314 MODULE_LICENSE("GPL"); 315 316 static struct net_device *my_dev; 317 318 static int __init arc_rimi_init(void) 319 { 320 struct net_device *dev; 321 322 dev = alloc_arcdev(device); 323 if (!dev) 324 return -ENOMEM; 325 326 if (node && node != 0xff) 327 dev->dev_addr[0] = node; 328 329 dev->mem_start = io; 330 dev->irq = irq; 331 if (dev->irq == 2) 332 dev->irq = 9; 333 334 if (arcrimi_probe(dev)) { 335 free_netdev(dev); 336 return -EIO; 337 } 338 339 my_dev = dev; 340 return 0; 341 } 342 343 static void __exit arc_rimi_exit(void) 344 { 345 struct net_device *dev = my_dev; 346 struct arcnet_local *lp = netdev_priv(dev); 347 348 unregister_netdev(dev); 349 iounmap(lp->mem_start); 350 release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1); 351 free_irq(dev->irq, dev); 352 free_netdev(dev); 353 } 354 355 #ifndef MODULE 356 static int __init arcrimi_setup(char *s) 357 { 358 int ints[8]; 359 360 s = get_options(s, 8, ints); 361 if (!ints[0]) 362 return 1; 363 switch (ints[0]) { 364 default: /* ERROR */ 365 pr_err("Too many arguments\n"); 366 case 3: /* Node ID */ 367 node = ints[3]; 368 case 2: /* IRQ */ 369 irq = ints[2]; 370 case 1: /* IO address */ 371 io = ints[1]; 372 } 373 if (*s) 374 snprintf(device, sizeof(device), "%s", s); 375 return 1; 376 } 377 __setup("arcrimi=", arcrimi_setup); 378 #endif /* MODULE */ 379 380 module_init(arc_rimi_init) 381 module_exit(arc_rimi_exit) 382