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1.1 ! root 1: /* hp-plus.c: A HP PCLAN/plus ethernet driver for linux. */ ! 2: /* ! 3: Written 1994 by Donald Becker. ! 4: ! 5: This driver is for the Hewlett Packard PC LAN (27***) plus ethercards. ! 6: These cards are sold under several model numbers, usually 2724*. ! 7: ! 8: This software may be used and distributed according to the terms ! 9: of the GNU Public License, incorporated herein by reference. ! 10: ! 11: The author may be reached as [email protected], or C/O ! 12: ! 13: Center of Excellence in Space Data and Information Sciences ! 14: Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771 ! 15: ! 16: As is often the case, a great deal of credit is owed to Russ Nelson. ! 17: The Crynwr packet driver was my primary source of HP-specific ! 18: programming information. ! 19: */ ! 20: ! 21: static const char *version = ! 22: "hp-plus.c:v1.10 9/24/94 Donald Becker ([email protected])\n"; ! 23: ! 24: #include <linux/module.h> ! 25: ! 26: #include <linux/string.h> /* Important -- this inlines word moves. */ ! 27: #include <linux/kernel.h> ! 28: #include <linux/sched.h> ! 29: #include <linux/errno.h> ! 30: #include <linux/ioport.h> ! 31: #include <linux/netdevice.h> ! 32: #include <linux/etherdevice.h> ! 33: ! 34: #include <asm/system.h> ! 35: #include <asm/io.h> ! 36: ! 37: ! 38: #include "8390.h" ! 39: ! 40: /* A zero-terminated list of I/O addresses to be probed. */ ! 41: static unsigned int hpplus_portlist[] = ! 42: {0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0}; ! 43: ! 44: /* ! 45: The HP EtherTwist chip implementation is a fairly routine DP8390 ! 46: implementation. It allows both shared memory and programmed-I/O buffer ! 47: access, using a custom interface for both. The programmed-I/O mode is ! 48: entirely implemented in the HP EtherTwist chip, bypassing the problem ! 49: ridden built-in 8390 facilities used on NE2000 designs. The shared ! 50: memory mode is likewise special, with an offset register used to make ! 51: packets appear at the shared memory base. Both modes use a base and bounds ! 52: page register to hide the Rx ring buffer wrap -- a packet that spans the ! 53: end of physical buffer memory appears continuous to the driver. (c.f. the ! 54: 3c503 and Cabletron E2100) ! 55: ! 56: A special note: the internal buffer of the board is only 8 bits wide. ! 57: This lays several nasty traps for the unaware: ! 58: - the 8390 must be programmed for byte-wide operations ! 59: - all I/O and memory operations must work on whole words (the access ! 60: latches are serially preloaded and have no byte-swapping ability). ! 61: ! 62: This board is laid out in I/O space much like the earlier HP boards: ! 63: the first 16 locations are for the board registers, and the second 16 are ! 64: for the 8390. The board is easy to identify, with both a dedicated 16 bit ! 65: ID register and a constant 0x530* value in the upper bits of the paging ! 66: register. ! 67: */ ! 68: ! 69: #define HP_ID 0x00 /* ID register, always 0x4850. */ ! 70: #define HP_PAGING 0x02 /* Registers visible @ 8-f, see PageName. */ ! 71: #define HPP_OPTION 0x04 /* Bitmapped options, see HP_Option. */ ! 72: #define HPP_OUT_ADDR 0x08 /* I/O output location in Perf_Page. */ ! 73: #define HPP_IN_ADDR 0x0A /* I/O input location in Perf_Page. */ ! 74: #define HP_DATAPORT 0x0c /* I/O data transfer in Perf_Page. */ ! 75: #define NIC_OFFSET 0x10 /* Offset to the 8390 registers. */ ! 76: #define HP_IO_EXTENT 32 ! 77: ! 78: #define HP_START_PG 0x00 /* First page of TX buffer */ ! 79: #define HP_STOP_PG 0x80 /* Last page +1 of RX ring */ ! 80: ! 81: /* The register set selected in HP_PAGING. */ ! 82: enum PageName { ! 83: Perf_Page = 0, /* Normal operation. */ ! 84: MAC_Page = 1, /* The ethernet address (+checksum). */ ! 85: HW_Page = 2, /* EEPROM-loaded hardware parameters. */ ! 86: LAN_Page = 4, /* Transceiver selection, testing, etc. */ ! 87: ID_Page = 6 }; ! 88: ! 89: /* The bit definitions for the HPP_OPTION register. */ ! 90: enum HP_Option { ! 91: NICReset = 1, ChipReset = 2, /* Active low, really UNreset. */ ! 92: EnableIRQ = 4, FakeIntr = 8, BootROMEnb = 0x10, IOEnb = 0x20, ! 93: MemEnable = 0x40, ZeroWait = 0x80, MemDisable = 0x1000, }; ! 94: ! 95: int hp_plus_probe(struct device *dev); ! 96: int hpp_probe1(struct device *dev, int ioaddr); ! 97: ! 98: static void hpp_reset_8390(struct device *dev); ! 99: static int hpp_open(struct device *dev); ! 100: static int hpp_close(struct device *dev); ! 101: static void hpp_mem_block_input(struct device *dev, int count, ! 102: struct sk_buff *skb, int ring_offset); ! 103: static void hpp_mem_block_output(struct device *dev, int count, ! 104: const unsigned char *buf, const int start_page); ! 105: static void hpp_mem_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, ! 106: int ring_page); ! 107: static void hpp_io_block_input(struct device *dev, int count, ! 108: struct sk_buff *skb, int ring_offset); ! 109: static void hpp_io_block_output(struct device *dev, int count, ! 110: const unsigned char *buf, const int start_page); ! 111: static void hpp_io_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, ! 112: int ring_page); ! 113: ! 114: ! 115: /* Probe a list of addresses for an HP LAN+ adaptor. ! 116: This routine is almost boilerplate. */ ! 117: #ifdef HAVE_DEVLIST ! 118: /* Support for a alternate probe manager, which will eliminate the ! 119: boilerplate below. */ ! 120: struct netdev_entry hpplus_drv = ! 121: {"hpplus", hpp_probe1, HP_IO_EXTENT, hpplus_portlist}; ! 122: #else ! 123: ! 124: int hp_plus_probe(struct device *dev) ! 125: { ! 126: int i; ! 127: int base_addr = dev ? dev->base_addr : 0; ! 128: ! 129: if (base_addr > 0x1ff) /* Check a single specified location. */ ! 130: return hpp_probe1(dev, base_addr); ! 131: else if (base_addr != 0) /* Don't probe at all. */ ! 132: return ENXIO; ! 133: ! 134: for (i = 0; hpplus_portlist[i]; i++) { ! 135: int ioaddr = hpplus_portlist[i]; ! 136: if (check_region(ioaddr, HP_IO_EXTENT)) ! 137: continue; ! 138: if (hpp_probe1(dev, ioaddr) == 0) ! 139: return 0; ! 140: } ! 141: ! 142: return ENODEV; ! 143: } ! 144: #endif ! 145: ! 146: /* Do the interesting part of the probe at a single address. */ ! 147: int hpp_probe1(struct device *dev, int ioaddr) ! 148: { ! 149: int i; ! 150: unsigned char checksum = 0; ! 151: const char *name = "HP-PC-LAN+"; ! 152: int mem_start; ! 153: static unsigned version_printed = 0; ! 154: ! 155: /* Check for the HP+ signature, 50 48 0x 53. */ ! 156: if (inw(ioaddr + HP_ID) != 0x4850 ! 157: || (inw(ioaddr + HP_PAGING) & 0xfff0) != 0x5300) ! 158: return ENODEV; ! 159: ! 160: /* We should have a "dev" from Space.c or the static module table. */ ! 161: if (dev == NULL) { ! 162: printk("hp-plus.c: Passed a NULL device.\n"); ! 163: dev = init_etherdev(0, 0); ! 164: } ! 165: ! 166: if (ei_debug && version_printed++ == 0) ! 167: printk(version); ! 168: ! 169: printk("%s: %s at %#3x,", dev->name, name, ioaddr); ! 170: ! 171: /* Retrieve and checksum the station address. */ ! 172: outw(MAC_Page, ioaddr + HP_PAGING); ! 173: ! 174: for(i = 0; i < ETHER_ADDR_LEN; i++) { ! 175: unsigned char inval = inb(ioaddr + 8 + i); ! 176: dev->dev_addr[i] = inval; ! 177: checksum += inval; ! 178: printk(" %2.2x", inval); ! 179: } ! 180: checksum += inb(ioaddr + 14); ! 181: ! 182: if (checksum != 0xff) { ! 183: printk(" bad checksum %2.2x.\n", checksum); ! 184: return ENODEV; ! 185: } else { ! 186: /* Point at the Software Configuration Flags. */ ! 187: outw(ID_Page, ioaddr + HP_PAGING); ! 188: printk(" ID %4.4x", inw(ioaddr + 12)); ! 189: } ! 190: ! 191: /* Allocate dev->priv and fill in 8390 specific dev fields. */ ! 192: if (ethdev_init(dev)) { ! 193: printk ("hp-plus.c: unable to allocate memory for dev->priv.\n"); ! 194: return -ENOMEM; ! 195: } ! 196: ! 197: /* Grab the region so we can find another board if something fails. */ ! 198: request_region(ioaddr, HP_IO_EXTENT,"hp-plus"); ! 199: ! 200: /* Read the IRQ line. */ ! 201: outw(HW_Page, ioaddr + HP_PAGING); ! 202: { ! 203: int irq = inb(ioaddr + 13) & 0x0f; ! 204: int option = inw(ioaddr + HPP_OPTION); ! 205: ! 206: dev->irq = irq; ! 207: if (option & MemEnable) { ! 208: mem_start = inw(ioaddr + 9) << 8; ! 209: printk(", IRQ %d, memory address %#x.\n", irq, mem_start); ! 210: } else { ! 211: mem_start = 0; ! 212: printk(", IRQ %d, programmed-I/O mode.\n", irq); ! 213: } ! 214: } ! 215: ! 216: /* Set the wrap registers for string I/O reads. */ ! 217: outw((HP_START_PG + TX_2X_PAGES) | ((HP_STOP_PG - 1) << 8), ioaddr + 14); ! 218: ! 219: /* Set the base address to point to the NIC, not the "real" base! */ ! 220: dev->base_addr = ioaddr + NIC_OFFSET; ! 221: ! 222: dev->open = &hpp_open; ! 223: dev->stop = &hpp_close; ! 224: ! 225: ei_status.name = name; ! 226: ei_status.word16 = 0; /* Agggghhhhh! Debug time: 2 days! */ ! 227: ei_status.tx_start_page = HP_START_PG; ! 228: ei_status.rx_start_page = HP_START_PG + TX_2X_PAGES; ! 229: ei_status.stop_page = HP_STOP_PG; ! 230: ! 231: ei_status.reset_8390 = &hpp_reset_8390; ! 232: ei_status.block_input = &hpp_io_block_input; ! 233: ei_status.block_output = &hpp_io_block_output; ! 234: ei_status.get_8390_hdr = &hpp_io_get_8390_hdr; ! 235: ! 236: /* Check if the memory_enable flag is set in the option register. */ ! 237: if (mem_start) { ! 238: ei_status.block_input = &hpp_mem_block_input; ! 239: ei_status.block_output = &hpp_mem_block_output; ! 240: ei_status.get_8390_hdr = &hpp_mem_get_8390_hdr; ! 241: dev->mem_start = mem_start; ! 242: dev->rmem_start = dev->mem_start + TX_2X_PAGES*256; ! 243: dev->mem_end = dev->rmem_end ! 244: = dev->mem_start + (HP_STOP_PG - HP_START_PG)*256; ! 245: } ! 246: ! 247: outw(Perf_Page, ioaddr + HP_PAGING); ! 248: NS8390_init(dev, 0); ! 249: /* Leave the 8390 and HP chip reset. */ ! 250: outw(inw(ioaddr + HPP_OPTION) & ~EnableIRQ, ioaddr + HPP_OPTION); ! 251: ! 252: return 0; ! 253: } ! 254: ! 255: static int ! 256: hpp_open(struct device *dev) ! 257: { ! 258: int ioaddr = dev->base_addr - NIC_OFFSET; ! 259: int option_reg; ! 260: ! 261: if (request_irq(dev->irq, &ei_interrupt, 0, "hp-plus", NULL)) { ! 262: return -EAGAIN; ! 263: } ! 264: ! 265: /* Reset the 8390 and HP chip. */ ! 266: option_reg = inw(ioaddr + HPP_OPTION); ! 267: outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION); ! 268: SLOW_DOWN_IO; SLOW_DOWN_IO; ! 269: /* Unreset the board and enable interrupts. */ ! 270: outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION); ! 271: ! 272: /* Set the wrap registers for programmed-I/O operation. */ ! 273: outw(HW_Page, ioaddr + HP_PAGING); ! 274: outw((HP_START_PG + TX_2X_PAGES) | ((HP_STOP_PG - 1) << 8), ioaddr + 14); ! 275: ! 276: /* Select the operational page. */ ! 277: outw(Perf_Page, ioaddr + HP_PAGING); ! 278: ! 279: ei_open(dev); ! 280: MOD_INC_USE_COUNT; ! 281: return 0; ! 282: } ! 283: ! 284: static int ! 285: hpp_close(struct device *dev) ! 286: { ! 287: int ioaddr = dev->base_addr - NIC_OFFSET; ! 288: int option_reg = inw(ioaddr + HPP_OPTION); ! 289: ! 290: free_irq(dev->irq, NULL); ! 291: irq2dev_map[dev->irq] = NULL; ! 292: ei_close(dev); ! 293: outw((option_reg & ~EnableIRQ) | MemDisable | NICReset | ChipReset, ! 294: ioaddr + HPP_OPTION); ! 295: ! 296: MOD_DEC_USE_COUNT; ! 297: return 0; ! 298: } ! 299: ! 300: static void ! 301: hpp_reset_8390(struct device *dev) ! 302: { ! 303: int ioaddr = dev->base_addr - NIC_OFFSET; ! 304: int option_reg = inw(ioaddr + HPP_OPTION); ! 305: ! 306: if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies); ! 307: ! 308: outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION); ! 309: /* Pause a few cycles for the hardware reset to take place. */ ! 310: SLOW_DOWN_IO; ! 311: SLOW_DOWN_IO; ! 312: ei_status.txing = 0; ! 313: outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION); ! 314: ! 315: SLOW_DOWN_IO; SLOW_DOWN_IO; ! 316: ! 317: ! 318: if ((inb_p(ioaddr+NIC_OFFSET+EN0_ISR) & ENISR_RESET) == 0) ! 319: printk("%s: hp_reset_8390() did not complete.\n", dev->name); ! 320: ! 321: if (ei_debug > 1) printk("8390 reset done (%ld).", jiffies); ! 322: return; ! 323: } ! 324: ! 325: /* The programmed-I/O version of reading the 4 byte 8390 specific header. ! 326: Note that transfer with the EtherTwist+ must be on word boundaries. */ ! 327: ! 328: static void ! 329: hpp_io_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, int ring_page) ! 330: { ! 331: int ioaddr = dev->base_addr - NIC_OFFSET; ! 332: ! 333: outw((ring_page<<8), ioaddr + HPP_IN_ADDR); ! 334: insw(ioaddr + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1); ! 335: } ! 336: ! 337: /* Block input and output, similar to the Crynwr packet driver. */ ! 338: ! 339: static void ! 340: hpp_io_block_input(struct device *dev, int count, struct sk_buff *skb, int ring_offset) ! 341: { ! 342: int ioaddr = dev->base_addr - NIC_OFFSET; ! 343: char *buf = skb->data; ! 344: ! 345: outw(ring_offset, ioaddr + HPP_IN_ADDR); ! 346: insw(ioaddr + HP_DATAPORT, buf, count>>1); ! 347: if (count & 0x01) ! 348: buf[count-1] = inw(ioaddr + HP_DATAPORT); ! 349: } ! 350: ! 351: /* The corresponding shared memory versions of the above 2 functions. */ ! 352: ! 353: static void ! 354: hpp_mem_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, int ring_page) ! 355: { ! 356: int ioaddr = dev->base_addr - NIC_OFFSET; ! 357: int option_reg = inw(ioaddr + HPP_OPTION); ! 358: ! 359: outw((ring_page<<8), ioaddr + HPP_IN_ADDR); ! 360: outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION); ! 361: memcpy_fromio(hdr, dev->mem_start, sizeof(struct e8390_pkt_hdr)); ! 362: outw(option_reg, ioaddr + HPP_OPTION); ! 363: hdr->count = (hdr->count + 3) & ~3; /* Round up allocation. */ ! 364: } ! 365: ! 366: static void ! 367: hpp_mem_block_input(struct device *dev, int count, struct sk_buff *skb, int ring_offset) ! 368: { ! 369: int ioaddr = dev->base_addr - NIC_OFFSET; ! 370: int option_reg = inw(ioaddr + HPP_OPTION); ! 371: ! 372: outw(ring_offset, ioaddr + HPP_IN_ADDR); ! 373: ! 374: outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION); ! 375: ! 376: /* Caution: this relies on get_8390_hdr() rounding up count! ! 377: Also note that we *can't* use eth_io_copy_and_sum() because ! 378: it will not always copy "count" bytes (e.g. padded IP). */ ! 379: ! 380: memcpy_fromio(skb->data, dev->mem_start, count); ! 381: outw(option_reg, ioaddr + HPP_OPTION); ! 382: } ! 383: ! 384: /* A special note: we *must* always transfer >=16 bit words. ! 385: It's always safe to round up, so we do. */ ! 386: static void ! 387: hpp_io_block_output(struct device *dev, int count, ! 388: const unsigned char *buf, const int start_page) ! 389: { ! 390: int ioaddr = dev->base_addr - NIC_OFFSET; ! 391: outw(start_page << 8, ioaddr + HPP_OUT_ADDR); ! 392: outsl(ioaddr + HP_DATAPORT, buf, (count+3)>>2); ! 393: return; ! 394: } ! 395: ! 396: static void ! 397: hpp_mem_block_output(struct device *dev, int count, ! 398: const unsigned char *buf, const int start_page) ! 399: { ! 400: int ioaddr = dev->base_addr - NIC_OFFSET; ! 401: int option_reg = inw(ioaddr + HPP_OPTION); ! 402: ! 403: outw(start_page << 8, ioaddr + HPP_OUT_ADDR); ! 404: outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION); ! 405: memcpy_toio(dev->mem_start, buf, (count + 3) & ~3); ! 406: outw(option_reg, ioaddr + HPP_OPTION); ! 407: ! 408: return; ! 409: } ! 410: ! 411: ! 412: #ifdef MODULE ! 413: #define MAX_HPP_CARDS 4 /* Max number of HPP cards per module */ ! 414: #define NAMELEN 8 /* # of chars for storing dev->name */ ! 415: static char namelist[NAMELEN * MAX_HPP_CARDS] = { 0, }; ! 416: static struct device dev_hpp[MAX_HPP_CARDS] = { ! 417: { ! 418: NULL, /* assign a chunk of namelist[] below */ ! 419: 0, 0, 0, 0, ! 420: 0, 0, ! 421: 0, 0, 0, NULL, NULL ! 422: }, ! 423: }; ! 424: ! 425: static int io[MAX_HPP_CARDS] = { 0, }; ! 426: static int irq[MAX_HPP_CARDS] = { 0, }; ! 427: ! 428: /* This is set up so that only a single autoprobe takes place per call. ! 429: ISA device autoprobes on a running machine are not recommended. */ ! 430: int ! 431: init_module(void) ! 432: { ! 433: int this_dev, found = 0; ! 434: ! 435: for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) { ! 436: struct device *dev = &dev_hpp[this_dev]; ! 437: dev->name = namelist+(NAMELEN*this_dev); ! 438: dev->irq = irq[this_dev]; ! 439: dev->base_addr = io[this_dev]; ! 440: dev->init = hp_plus_probe; ! 441: if (io[this_dev] == 0) { ! 442: if (this_dev != 0) break; /* only autoprobe 1st one */ ! 443: printk(KERN_NOTICE "hp-plus.c: Presently autoprobing (not recommended) for a single card.\n"); ! 444: } ! 445: if (register_netdev(dev) != 0) { ! 446: printk(KERN_WARNING "hp-plus.c: No HP-Plus card found (i/o = 0x%x).\n", io[this_dev]); ! 447: if (found != 0) return 0; /* Got at least one. */ ! 448: return -ENXIO; ! 449: } ! 450: found++; ! 451: } ! 452: ! 453: return 0; ! 454: } ! 455: ! 456: void ! 457: cleanup_module(void) ! 458: { ! 459: int this_dev; ! 460: ! 461: for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) { ! 462: struct device *dev = &dev_hpp[this_dev]; ! 463: if (dev->priv != NULL) { ! 464: /* NB: hpp_close() handles free_irq + irq2dev map */ ! 465: int ioaddr = dev->base_addr - NIC_OFFSET; ! 466: kfree(dev->priv); ! 467: dev->priv = NULL; ! 468: release_region(ioaddr, HP_IO_EXTENT); ! 469: unregister_netdev(dev); ! 470: } ! 471: } ! 472: } ! 473: #endif /* MODULE */ ! 474: ! 475: /* ! 476: * Local variables: ! 477: * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c hp-plus.c" ! 478: * version-control: t ! 479: * kept-new-versions: 5 ! 480: * tab-width: 4 ! 481: * c-indent-level: 4 ! 482: * End: ! 483: */
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