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Annotation of Gnu-Mach/linux/src/drivers/net/smc-ultra32.c, revision 1.1

1.1     ! root        1: /*     smc-ultra32.c: An SMC Ultra32 EISA ethernet driver for linux.
        !             2: 
        !             3: Sources:
        !             4: 
        !             5:        This driver is based on (cloned from) the ISA SMC Ultra driver
        !             6:        written by Donald Becker. Modifications to support the EISA
        !             7:        version of the card by Paul Gortmaker and Leonard N. Zubkoff.
        !             8: 
        !             9:        This software may be used and distributed according to the terms
        !            10:        of the GNU Public License, incorporated herein by reference.
        !            11: 
        !            12: Theory of Operation:
        !            13: 
        !            14:        The SMC Ultra32C card uses the SMC 83c790 chip which is also
        !            15:        found on the ISA SMC Ultra cards. It has a shared memory mode of
        !            16:        operation that makes it similar to the ISA version of the card.
        !            17:        The main difference is that the EISA card has 32KB of RAM, but
        !            18:        only an 8KB window into that memory. The EISA card also can be
        !            19:        set for a bus-mastering mode of operation via the ECU, but that
        !            20:        is not (and probably will never be) supported by this driver.
        !            21:        The ECU should be run to enable shared memory and to disable the
        !            22:        bus-mastering feature for use with linux.
        !            23: 
        !            24:        By programming the 8390 to use only 8KB RAM, the modifications
        !            25:        to the ISA driver can be limited to the probe and initialization
        !            26:        code. This allows easy integration of EISA support into the ISA
        !            27:        driver. However, the driver development kit from SMC provided the
        !            28:        register information for sliding the 8KB window, and hence the 8390
        !            29:        is programmed to use the full 32KB RAM.
        !            30: 
        !            31:        Unfortunately this required code changes outside the probe/init
        !            32:        routines, and thus we decided to separate the EISA driver from
        !            33:        the ISA one. In this way, ISA users don't end up with a larger
        !            34:        driver due to the EISA code, and EISA users don't end up with a
        !            35:        larger driver due to the ISA EtherEZ PIO code. The driver is
        !            36:        similar to the 3c503/16 driver, in that the window must be set
        !            37:        back to the 1st 8KB of space for access to the two 8390 Tx slots.
        !            38: 
        !            39:        In testing, using only 8KB RAM (3 Tx / 5 Rx) didn't appear to
        !            40:        be a limiting factor, since the EISA bus could get packets off
        !            41:        the card fast enough, but having the use of lots of RAM as Rx
        !            42:        space is extra insurance if interrupt latencies become excessive.
        !            43: 
        !            44: */
        !            45: 
        !            46: static const char *version = "smc-ultra32.c: 06/97 v1.00\n";
        !            47: 
        !            48: 
        !            49: #include <linux/module.h>
        !            50: #include <linux/kernel.h>
        !            51: #include <linux/sched.h>
        !            52: #include <linux/errno.h>
        !            53: #include <linux/string.h>
        !            54: 
        !            55: #include <asm/io.h>
        !            56: #include <asm/system.h>
        !            57: 
        !            58: #include <linux/netdevice.h>
        !            59: #include <linux/etherdevice.h>
        !            60: #include "8390.h"
        !            61: 
        !            62: int ultra32_probe(struct device *dev);
        !            63: int ultra32_probe1(struct device *dev, int ioaddr);
        !            64: static int ultra32_open(struct device *dev);
        !            65: static void ultra32_reset_8390(struct device *dev);
        !            66: static void ultra32_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr,
        !            67:                                 int ring_page);
        !            68: static void ultra32_block_input(struct device *dev, int count,
        !            69:                                struct sk_buff *skb, int ring_offset);
        !            70: static void ultra32_block_output(struct device *dev, int count,
        !            71:                                 const unsigned char *buf, const int start_page);
        !            72: static int ultra32_close(struct device *dev);
        !            73: 
        !            74: #define ULTRA32_CMDREG 0       /* Offset to ASIC command register. */
        !            75: #define         ULTRA32_RESET  0x80    /* Board reset, in ULTRA32_CMDREG. */
        !            76: #define         ULTRA32_MEMENB 0x40    /* Enable the shared memory. */
        !            77: #define ULTRA32_NIC_OFFSET 16  /* NIC register offset from the base_addr. */
        !            78: #define ULTRA32_IO_EXTENT 32
        !            79: #define EN0_ERWCNT             0x08    /* Early receive warning count. */
        !            80: 
        !            81: /*
        !            82:  * Defines that apply only to the Ultra32 EISA card. Note that
        !            83:  * "smc" = 10011 01101 00011 = 0x4da3, and hence !smc8010.cfg translates
        !            84:  * into an EISA ID of 0x1080A34D
        !            85:  */
        !            86: #define ULTRA32_BASE   0xca0
        !            87: #define ULTRA32_ID     0x1080a34d
        !            88: #define ULTRA32_IDPORT (-0x20) /* 0xc80 */
        !            89: /* Config regs 1->7 from the EISA !SMC8010.CFG file. */
        !            90: #define ULTRA32_CFG1   0x04    /* 0xca4 */
        !            91: #define ULTRA32_CFG2   0x05    /* 0xca5 */
        !            92: #define ULTRA32_CFG3   (-0x18) /* 0xc88 */
        !            93: #define ULTRA32_CFG4   (-0x17) /* 0xc89 */
        !            94: #define ULTRA32_CFG5   (-0x16) /* 0xc8a */
        !            95: #define ULTRA32_CFG6   (-0x15) /* 0xc8b */
        !            96: #define ULTRA32_CFG7   0x0d    /* 0xcad */
        !            97: 
        !            98: 
        !            99: /*     Probe for the Ultra32.  This looks like a 8013 with the station
        !           100:        address PROM at I/O ports <base>+8 to <base>+13, with a checksum
        !           101:        following.
        !           102: */
        !           103: 
        !           104: int ultra32_probe(struct device *dev)
        !           105: {
        !           106:        const char *ifmap[] = {"UTP No Link", "", "UTP/AUI", "UTP/BNC"};
        !           107:        int ioaddr, edge, media;
        !           108: 
        !           109:        if (!EISA_bus) return ENODEV;
        !           110: 
        !           111:        /* EISA spec allows for up to 16 slots, but 8 is typical. */
        !           112:        for (ioaddr = 0x1000 + ULTRA32_BASE; ioaddr < 0x9000; ioaddr += 0x1000)
        !           113:        if (check_region(ioaddr, ULTRA32_IO_EXTENT) == 0 &&
        !           114:            inb(ioaddr + ULTRA32_IDPORT) != 0xff &&
        !           115:            inl(ioaddr + ULTRA32_IDPORT) == ULTRA32_ID) {
        !           116:                media = inb(ioaddr + ULTRA32_CFG7) & 0x03;
        !           117:                edge = inb(ioaddr + ULTRA32_CFG5) & 0x08;
        !           118:                printk("SMC Ultra32 in EISA Slot %d, Media: %s, %s IRQs.\n",
        !           119:                       ioaddr >> 12, ifmap[media],
        !           120:                       (edge ? "Edge Triggered" : "Level Sensitive"));
        !           121:                if (ultra32_probe1(dev, ioaddr) == 0)
        !           122:                  return 0;
        !           123:        }
        !           124:        return ENODEV;
        !           125: }
        !           126: 
        !           127: int ultra32_probe1(struct device *dev, int ioaddr)
        !           128: {
        !           129:        int i;
        !           130:        int checksum = 0;
        !           131:        const char *model_name;
        !           132:        static unsigned version_printed = 0;
        !           133:        /* Values from various config regs. */
        !           134:        unsigned char idreg = inb(ioaddr + 7);
        !           135:        unsigned char reg4 = inb(ioaddr + 4) & 0x7f;
        !           136: 
        !           137:        /* Check the ID nibble. */
        !           138:        if ((idreg & 0xf0) != 0x20)                     /* SMC Ultra */
        !           139:                return ENODEV;
        !           140: 
        !           141:        /* Select the station address register set. */
        !           142:        outb(reg4, ioaddr + 4);
        !           143: 
        !           144:        for (i = 0; i < 8; i++)
        !           145:                checksum += inb(ioaddr + 8 + i);
        !           146:        if ((checksum & 0xff) != 0xff)
        !           147:                return ENODEV;
        !           148: 
        !           149:        /* We should have a "dev" from Space.c or the static module table. */
        !           150:        if (dev == NULL) {
        !           151:                printk("smc-ultra32.c: Passed a NULL device.\n");
        !           152:                dev = init_etherdev(0, 0);
        !           153:        }
        !           154: 
        !           155:        if (ei_debug  &&  version_printed++ == 0)
        !           156:                printk(version);
        !           157: 
        !           158:        model_name = "SMC Ultra32";
        !           159: 
        !           160:        printk("%s: %s at 0x%X,", dev->name, model_name, ioaddr);
        !           161: 
        !           162:        for (i = 0; i < 6; i++)
        !           163:                printk(" %2.2X", dev->dev_addr[i] = inb(ioaddr + 8 + i));
        !           164: 
        !           165:        /* Switch from the station address to the alternate register set and
        !           166:           read the useful registers there. */
        !           167:        outb(0x80 | reg4, ioaddr + 4);
        !           168: 
        !           169:        /* Enable FINE16 mode to avoid BIOS ROM width mismatches @ reboot. */
        !           170:        outb(0x80 | inb(ioaddr + 0x0c), ioaddr + 0x0c);
        !           171: 
        !           172:        /* Reset RAM addr. */
        !           173:        outb(0x00, ioaddr + 0x0b);
        !           174: 
        !           175:        /* Switch back to the station address register set so that the
        !           176:           MS-DOS driver can find the card after a warm boot. */
        !           177:        outb(reg4, ioaddr + 4);
        !           178: 
        !           179:        if ((inb(ioaddr + ULTRA32_CFG5) & 0x40) == 0) {
        !           180:                printk("\nsmc-ultra32: Card RAM is disabled!  "
        !           181:                       "Run EISA config utility.\n");
        !           182:                return ENODEV;
        !           183:        }
        !           184:        if ((inb(ioaddr + ULTRA32_CFG2) & 0x04) == 0)
        !           185:                printk("\nsmc-ultra32: Ignoring Bus-Master enable bit.  "
        !           186:                       "Run EISA config utility.\n");
        !           187: 
        !           188:        if (dev->irq < 2) {
        !           189:                unsigned char irqmap[] = {0, 9, 3, 5, 7, 10, 11, 15};
        !           190:                int irq = irqmap[inb(ioaddr + ULTRA32_CFG5) & 0x07];
        !           191:                if (irq == 0) {
        !           192:                        printk(", failed to detect IRQ line.\n");
        !           193:                        return -EAGAIN;
        !           194:                }
        !           195:                dev->irq = irq;
        !           196:        }
        !           197: 
        !           198:        /* Allocate dev->priv and fill in 8390 specific dev fields. */
        !           199:        if (ethdev_init(dev)) {
        !           200:                printk (", no memory for dev->priv.\n");
        !           201:                 return -ENOMEM;
        !           202:         }
        !           203: 
        !           204:        /* OK, we are certain this is going to work.  Setup the device. */
        !           205:        request_region(ioaddr, ULTRA32_IO_EXTENT, model_name);
        !           206: 
        !           207:        /* The 8390 isn't at the base address, so fake the offset */
        !           208:        dev->base_addr = ioaddr + ULTRA32_NIC_OFFSET;
        !           209: 
        !           210:        /* Save RAM address in the unused reg0 to avoid excess inb's. */
        !           211:        ei_status.reg0 = inb(ioaddr + ULTRA32_CFG3) & 0xfc;
        !           212: 
        !           213:        dev->mem_start =  0xc0000 + ((ei_status.reg0 & 0x7c) << 11);
        !           214: 
        !           215:        ei_status.name = model_name;
        !           216:        ei_status.word16 = 1;
        !           217:        ei_status.tx_start_page = 0;
        !           218:        ei_status.rx_start_page = TX_PAGES;
        !           219:        /* All Ultra32 cards have 32KB memory with an 8KB window. */
        !           220:        ei_status.stop_page = 128;
        !           221: 
        !           222:        dev->rmem_start = dev->mem_start + TX_PAGES*256;
        !           223:        dev->mem_end = dev->rmem_end = dev->mem_start + 0x1fff;
        !           224: 
        !           225:        printk(", IRQ %d, 32KB memory, 8KB window at 0x%lx-0x%lx.\n",
        !           226:               dev->irq, dev->mem_start, dev->mem_end);
        !           227:        ei_status.block_input = &ultra32_block_input;
        !           228:        ei_status.block_output = &ultra32_block_output;
        !           229:        ei_status.get_8390_hdr = &ultra32_get_8390_hdr;
        !           230:        ei_status.reset_8390 = &ultra32_reset_8390;
        !           231:        dev->open = &ultra32_open;
        !           232:        dev->stop = &ultra32_close;
        !           233:        NS8390_init(dev, 0);
        !           234: 
        !           235:        return 0;
        !           236: }
        !           237: 
        !           238: static int ultra32_open(struct device *dev)
        !           239: {
        !           240:        int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET; /* ASIC addr */
        !           241: 
        !           242:        if (request_irq(dev->irq, ei_interrupt, 0, ei_status.name, dev))
        !           243:                return -EAGAIN;
        !           244: 
        !           245:        outb(ULTRA32_MEMENB, ioaddr); /* Enable Shared Memory. */
        !           246:        outb(0x80, ioaddr + ULTRA32_CFG6); /* Enable Interrupts. */
        !           247:        outb(0x84, ioaddr + 5); /* Enable MEM16 & Disable Bus Master. */
        !           248:        outb(0x01, ioaddr + 6); /* Enable Interrupts. */
        !           249:        /* Set the early receive warning level in window 0 high enough not
        !           250:           to receive ERW interrupts. */
        !           251:        outb_p(E8390_NODMA+E8390_PAGE0, dev->base_addr);
        !           252:        outb(0xff, dev->base_addr + EN0_ERWCNT);
        !           253:        ei_open(dev);
        !           254:        MOD_INC_USE_COUNT;
        !           255:        return 0;
        !           256: }
        !           257: 
        !           258: static int ultra32_close(struct device *dev)
        !           259: {
        !           260:        int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET; /* CMDREG */
        !           261: 
        !           262:        dev->start = 0;
        !           263:        dev->tbusy = 1;
        !           264: 
        !           265:        if (ei_debug > 1)
        !           266:                printk("%s: Shutting down ethercard.\n", dev->name);
        !           267: 
        !           268:        outb(0x00, ioaddr + ULTRA32_CFG6); /* Disable Interrupts. */
        !           269:        outb(0x00, ioaddr + 6);         /* Disable interrupts. */
        !           270:        free_irq(dev->irq, dev);
        !           271:        irq2dev_map[dev->irq] = 0;
        !           272: 
        !           273:        NS8390_init(dev, 0);
        !           274: 
        !           275:        MOD_DEC_USE_COUNT;
        !           276: 
        !           277:        return 0;
        !           278: }
        !           279: 
        !           280: static void ultra32_reset_8390(struct device *dev)
        !           281: {
        !           282:        int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET; /* ASIC base addr */
        !           283: 
        !           284:        outb(ULTRA32_RESET, ioaddr);
        !           285:        if (ei_debug > 1) printk("resetting Ultra32, t=%ld...", jiffies);
        !           286:        ei_status.txing = 0;
        !           287: 
        !           288:        outb(ULTRA32_MEMENB, ioaddr); /* Enable Shared Memory. */
        !           289:        outb(0x80, ioaddr + ULTRA32_CFG6); /* Enable Interrupts. */
        !           290:        outb(0x84, ioaddr + 5); /* Enable MEM16 & Disable Bus Master. */
        !           291:        outb(0x01, ioaddr + 6); /* Enable Interrupts. */
        !           292:        if (ei_debug > 1) printk("reset done\n");
        !           293:        return;
        !           294: }
        !           295: 
        !           296: /* Grab the 8390 specific header. Similar to the block_input routine, but
        !           297:    we don't need to be concerned with ring wrap as the header will be at
        !           298:    the start of a page, so we optimize accordingly. */
        !           299: 
        !           300: static void ultra32_get_8390_hdr(struct device *dev,
        !           301:                                 struct e8390_pkt_hdr *hdr,
        !           302:                                 int ring_page)
        !           303: {
        !           304:        unsigned long hdr_start = dev->mem_start + ((ring_page & 0x1f) << 8);
        !           305:        unsigned int RamReg = dev->base_addr - ULTRA32_NIC_OFFSET + ULTRA32_CFG3;
        !           306: 
        !           307:        /* Select correct 8KB Window. */
        !           308:        outb(ei_status.reg0 | ((ring_page & 0x60) >> 5), RamReg);
        !           309: 
        !           310: #ifdef notdef
        !           311:        /* Officially this is what we are doing, but the readl() is faster */
        !           312:        memcpy_fromio(hdr, hdr_start, sizeof(struct e8390_pkt_hdr));
        !           313: #else
        !           314:        ((unsigned int*)hdr)[0] = readl(hdr_start);
        !           315: #endif
        !           316: }
        !           317: 
        !           318: /* Block input and output are easy on shared memory ethercards, the only
        !           319:    complication is when the ring buffer wraps, or in this case, when a
        !           320:    packet spans an 8KB boundary. Note that the current 8KB segment is
        !           321:    already set by the get_8390_hdr routine. */
        !           322: 
        !           323: static void ultra32_block_input(struct device *dev,
        !           324:                                int count,
        !           325:                                struct sk_buff *skb,
        !           326:                                int ring_offset)
        !           327: {
        !           328:        unsigned long xfer_start = dev->mem_start + (ring_offset & 0x1fff);
        !           329:        unsigned int RamReg = dev->base_addr - ULTRA32_NIC_OFFSET + ULTRA32_CFG3;
        !           330: 
        !           331:        if ((ring_offset & ~0x1fff) != ((ring_offset + count - 1) & ~0x1fff)) {
        !           332:                int semi_count = 8192 - (ring_offset & 0x1FFF);
        !           333:                memcpy_fromio(skb->data, xfer_start, semi_count);
        !           334:                count -= semi_count;
        !           335:                if (ring_offset < 96*256) {
        !           336:                        /* Select next 8KB Window. */
        !           337:                        ring_offset += semi_count;
        !           338:                        outb(ei_status.reg0 | ((ring_offset & 0x6000) >> 13), RamReg);
        !           339:                        memcpy_fromio(skb->data + semi_count, dev->mem_start, count);
        !           340:                } else {
        !           341:                        /* Select first 8KB Window. */
        !           342:                        outb(ei_status.reg0, RamReg);
        !           343:                        memcpy_fromio(skb->data + semi_count, dev->rmem_start, count);
        !           344:                }
        !           345:        } else {
        !           346:                /* Packet is in one chunk -- we can copy + cksum. */
        !           347:                eth_io_copy_and_sum(skb, xfer_start, count, 0);
        !           348:        }
        !           349: }
        !           350: 
        !           351: static void ultra32_block_output(struct device *dev,
        !           352:                                 int count,
        !           353:                                 const unsigned char *buf,
        !           354:                                 int start_page)
        !           355: {
        !           356:        unsigned long xfer_start = dev->mem_start + (start_page<<8);
        !           357:        unsigned int RamReg = dev->base_addr - ULTRA32_NIC_OFFSET + ULTRA32_CFG3;
        !           358: 
        !           359:        /* Select first 8KB Window. */
        !           360:        outb(ei_status.reg0, RamReg);
        !           361: 
        !           362:        memcpy_toio(xfer_start, buf, count);
        !           363: }
        !           364: 
        !           365: #ifdef MODULE
        !           366: #define MAX_ULTRA32_CARDS   4  /* Max number of Ultra cards per module */
        !           367: #define NAMELEN                    8   /* # of chars for storing dev->name */
        !           368: static char namelist[NAMELEN * MAX_ULTRA32_CARDS] = { 0, };
        !           369: static struct device dev_ultra[MAX_ULTRA32_CARDS] = {
        !           370:        {
        !           371:                NULL,           /* assign a chunk of namelist[] below */
        !           372:                0, 0, 0, 0,
        !           373:                0, 0,
        !           374:                0, 0, 0, NULL, NULL
        !           375:        },
        !           376: };
        !           377: 
        !           378: int init_module(void)
        !           379: {
        !           380:        int this_dev, found = 0;
        !           381: 
        !           382:        for (this_dev = 0; this_dev < MAX_ULTRA32_CARDS; this_dev++) {
        !           383:                struct device *dev = &dev_ultra[this_dev];
        !           384:                dev->name = namelist+(NAMELEN*this_dev);
        !           385:                dev->init = ultra32_probe;
        !           386:                if (register_netdev(dev) != 0) {
        !           387:                        if (found > 0) return 0; /* Got at least one. */
        !           388:                        printk(KERN_WARNING "smc-ultra32.c: No SMC Ultra32 found.\n");
        !           389:                        return -ENXIO;
        !           390:                }
        !           391:                found++;
        !           392:        }
        !           393: 
        !           394:        return 0;
        !           395: }
        !           396: 
        !           397: void cleanup_module(void)
        !           398: {
        !           399:        int this_dev;
        !           400: 
        !           401:        for (this_dev = 0; this_dev < MAX_ULTRA32_CARDS; this_dev++) {
        !           402:                struct device *dev = &dev_ultra[this_dev];
        !           403:                if (dev->priv != NULL) {
        !           404:                        /* NB: ultra32_close_card() does free_irq + irq2dev */
        !           405:                        int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET;
        !           406:                        kfree(dev->priv);
        !           407:                        dev->priv = NULL;
        !           408:                        release_region(ioaddr, ULTRA32_IO_EXTENT);
        !           409:                        unregister_netdev(dev);
        !           410:                }
        !           411:        }
        !           412: }
        !           413: #endif /* MODULE */

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