smc-ultra32.c
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上传日期:2013-02-24
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- /* smc-ultra32.c: An SMC Ultra32 EISA ethernet driver for linux.
- Sources:
- This driver is based on (cloned from) the ISA SMC Ultra driver
- written by Donald Becker. Modifications to support the EISA
- version of the card by Paul Gortmaker and Leonard N. Zubkoff.
- This software may be used and distributed according to the terms
- of the GNU General Public License, incorporated herein by reference.
- Theory of Operation:
- The SMC Ultra32C card uses the SMC 83c790 chip which is also
- found on the ISA SMC Ultra cards. It has a shared memory mode of
- operation that makes it similar to the ISA version of the card.
- The main difference is that the EISA card has 32KB of RAM, but
- only an 8KB window into that memory. The EISA card also can be
- set for a bus-mastering mode of operation via the ECU, but that
- is not (and probably will never be) supported by this driver.
- The ECU should be run to enable shared memory and to disable the
- bus-mastering feature for use with linux.
- By programming the 8390 to use only 8KB RAM, the modifications
- to the ISA driver can be limited to the probe and initialization
- code. This allows easy integration of EISA support into the ISA
- driver. However, the driver development kit from SMC provided the
- register information for sliding the 8KB window, and hence the 8390
- is programmed to use the full 32KB RAM.
- Unfortunately this required code changes outside the probe/init
- routines, and thus we decided to separate the EISA driver from
- the ISA one. In this way, ISA users don't end up with a larger
- driver due to the EISA code, and EISA users don't end up with a
- larger driver due to the ISA EtherEZ PIO code. The driver is
- similar to the 3c503/16 driver, in that the window must be set
- back to the 1st 8KB of space for access to the two 8390 Tx slots.
- In testing, using only 8KB RAM (3 Tx / 5 Rx) didn't appear to
- be a limiting factor, since the EISA bus could get packets off
- the card fast enough, but having the use of lots of RAM as Rx
- space is extra insurance if interrupt latencies become excessive.
- */
- static const char *version = "smc-ultra32.c: 06/97 v1.00n";
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/errno.h>
- #include <linux/string.h>
- #include <linux/init.h>
- #include <asm/io.h>
- #include <asm/system.h>
- #include <linux/netdevice.h>
- #include <linux/etherdevice.h>
- #include "8390.h"
- int ultra32_probe(struct net_device *dev);
- static int ultra32_probe1(struct net_device *dev, int ioaddr);
- static int ultra32_open(struct net_device *dev);
- static void ultra32_reset_8390(struct net_device *dev);
- static void ultra32_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
- int ring_page);
- static void ultra32_block_input(struct net_device *dev, int count,
- struct sk_buff *skb, int ring_offset);
- static void ultra32_block_output(struct net_device *dev, int count,
- const unsigned char *buf,
- const int start_page);
- static int ultra32_close(struct net_device *dev);
- #define ULTRA32_CMDREG 0 /* Offset to ASIC command register. */
- #define ULTRA32_RESET 0x80 /* Board reset, in ULTRA32_CMDREG. */
- #define ULTRA32_MEMENB 0x40 /* Enable the shared memory. */
- #define ULTRA32_NIC_OFFSET 16 /* NIC register offset from the base_addr. */
- #define ULTRA32_IO_EXTENT 32
- #define EN0_ERWCNT 0x08 /* Early receive warning count. */
- /*
- * Defines that apply only to the Ultra32 EISA card. Note that
- * "smc" = 10011 01101 00011 = 0x4da3, and hence !smc8010.cfg translates
- * into an EISA ID of 0x1080A34D
- */
- #define ULTRA32_BASE 0xca0
- #define ULTRA32_ID 0x1080a34d
- #define ULTRA32_IDPORT (-0x20) /* 0xc80 */
- /* Config regs 1->7 from the EISA !SMC8010.CFG file. */
- #define ULTRA32_CFG1 0x04 /* 0xca4 */
- #define ULTRA32_CFG2 0x05 /* 0xca5 */
- #define ULTRA32_CFG3 (-0x18) /* 0xc88 */
- #define ULTRA32_CFG4 (-0x17) /* 0xc89 */
- #define ULTRA32_CFG5 (-0x16) /* 0xc8a */
- #define ULTRA32_CFG6 (-0x15) /* 0xc8b */
- #define ULTRA32_CFG7 0x0d /* 0xcad */
- /* Probe for the Ultra32. This looks like a 8013 with the station
- address PROM at I/O ports <base>+8 to <base>+13, with a checksum
- following.
- */
- int __init ultra32_probe(struct net_device *dev)
- {
- int ioaddr;
- if (!EISA_bus) return -ENODEV;
- SET_MODULE_OWNER(dev);
- /* EISA spec allows for up to 16 slots, but 8 is typical. */
- for (ioaddr = 0x1000 + ULTRA32_BASE; ioaddr < 0x9000; ioaddr += 0x1000)
- if (ultra32_probe1(dev, ioaddr) == 0)
- return 0;
- return -ENODEV;
- }
- static int __init ultra32_probe1(struct net_device *dev, int ioaddr)
- {
- int i, edge, media, retval;
- int checksum = 0;
- const char *model_name;
- static unsigned version_printed;
- /* Values from various config regs. */
- unsigned char idreg;
- unsigned char reg4;
- const char *ifmap[] = {"UTP No Link", "", "UTP/AUI", "UTP/BNC"};
- if (!request_region(ioaddr, ULTRA32_IO_EXTENT, dev->name))
- return -EBUSY;
- if (inb(ioaddr + ULTRA32_IDPORT) == 0xff ||
- inl(ioaddr + ULTRA32_IDPORT) != ULTRA32_ID) {
- retval = -ENODEV;
- goto out;
- }
- media = inb(ioaddr + ULTRA32_CFG7) & 0x03;
- edge = inb(ioaddr + ULTRA32_CFG5) & 0x08;
- printk("SMC Ultra32 in EISA Slot %d, Media: %s, %s IRQs.n",
- ioaddr >> 12, ifmap[media],
- (edge ? "Edge Triggered" : "Level Sensitive"));
- idreg = inb(ioaddr + 7);
- reg4 = inb(ioaddr + 4) & 0x7f;
- /* Check the ID nibble. */
- if ((idreg & 0xf0) != 0x20) { /* SMC Ultra */
- retval = -ENODEV;
- goto out;
- }
- /* Select the station address register set. */
- outb(reg4, ioaddr + 4);
- for (i = 0; i < 8; i++)
- checksum += inb(ioaddr + 8 + i);
- if ((checksum & 0xff) != 0xff) {
- retval = -ENODEV;
- goto out;
- }
- if (ei_debug && version_printed++ == 0)
- printk(version);
- model_name = "SMC Ultra32";
- printk("%s: %s at 0x%X,", dev->name, model_name, ioaddr);
- for (i = 0; i < 6; i++)
- printk(" %2.2X", dev->dev_addr[i] = inb(ioaddr + 8 + i));
- /* Switch from the station address to the alternate register set and
- read the useful registers there. */
- outb(0x80 | reg4, ioaddr + 4);
- /* Enable FINE16 mode to avoid BIOS ROM width mismatches @ reboot. */
- outb(0x80 | inb(ioaddr + 0x0c), ioaddr + 0x0c);
- /* Reset RAM addr. */
- outb(0x00, ioaddr + 0x0b);
- /* Switch back to the station address register set so that the
- MS-DOS driver can find the card after a warm boot. */
- outb(reg4, ioaddr + 4);
- if ((inb(ioaddr + ULTRA32_CFG5) & 0x40) == 0) {
- printk("nsmc-ultra32: Card RAM is disabled! "
- "Run EISA config utility.n");
- retval = -ENODEV;
- goto out;
- }
- if ((inb(ioaddr + ULTRA32_CFG2) & 0x04) == 0)
- printk("nsmc-ultra32: Ignoring Bus-Master enable bit. "
- "Run EISA config utility.n");
- if (dev->irq < 2) {
- unsigned char irqmap[] = {0, 9, 3, 5, 7, 10, 11, 15};
- int irq = irqmap[inb(ioaddr + ULTRA32_CFG5) & 0x07];
- if (irq == 0) {
- printk(", failed to detect IRQ line.n");
- retval = -EAGAIN;
- goto out;
- }
- dev->irq = irq;
- }
- /* Allocate dev->priv and fill in 8390 specific dev fields. */
- if (ethdev_init(dev)) {
- printk (", no memory for dev->priv.n");
- retval = -ENOMEM;
- goto out;
- }
- /* The 8390 isn't at the base address, so fake the offset */
- dev->base_addr = ioaddr + ULTRA32_NIC_OFFSET;
- /* Save RAM address in the unused reg0 to avoid excess inb's. */
- ei_status.reg0 = inb(ioaddr + ULTRA32_CFG3) & 0xfc;
- dev->mem_start = 0xc0000 + ((ei_status.reg0 & 0x7c) << 11);
- ei_status.name = model_name;
- ei_status.word16 = 1;
- ei_status.tx_start_page = 0;
- ei_status.rx_start_page = TX_PAGES;
- /* All Ultra32 cards have 32KB memory with an 8KB window. */
- ei_status.stop_page = 128;
- dev->rmem_start = dev->mem_start + TX_PAGES*256;
- dev->mem_end = dev->rmem_end = dev->mem_start + 0x1fff;
- printk(", IRQ %d, 32KB memory, 8KB window at 0x%lx-0x%lx.n",
- dev->irq, dev->mem_start, dev->mem_end);
- ei_status.block_input = &ultra32_block_input;
- ei_status.block_output = &ultra32_block_output;
- ei_status.get_8390_hdr = &ultra32_get_8390_hdr;
- ei_status.reset_8390 = &ultra32_reset_8390;
- dev->open = &ultra32_open;
- dev->stop = &ultra32_close;
- NS8390_init(dev, 0);
- return 0;
- out:
- release_region(ioaddr, ULTRA32_IO_EXTENT);
- return retval;
- }
- static int ultra32_open(struct net_device *dev)
- {
- int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET; /* ASIC addr */
- int irq_flags = (inb(ioaddr + ULTRA32_CFG5) & 0x08) ? 0 : SA_SHIRQ;
- int retval;
- retval = request_irq(dev->irq, ei_interrupt, irq_flags, dev->name, dev);
- if (retval)
- return retval;
- outb(ULTRA32_MEMENB, ioaddr); /* Enable Shared Memory. */
- outb(0x80, ioaddr + ULTRA32_CFG6); /* Enable Interrupts. */
- outb(0x84, ioaddr + 5); /* Enable MEM16 & Disable Bus Master. */
- outb(0x01, ioaddr + 6); /* Enable Interrupts. */
- /* Set the early receive warning level in window 0 high enough not
- to receive ERW interrupts. */
- outb_p(E8390_NODMA+E8390_PAGE0, dev->base_addr);
- outb(0xff, dev->base_addr + EN0_ERWCNT);
- ei_open(dev);
- return 0;
- }
- static int ultra32_close(struct net_device *dev)
- {
- int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET; /* CMDREG */
- netif_stop_queue(dev);
-
- if (ei_debug > 1)
- printk("%s: Shutting down ethercard.n", dev->name);
- outb(0x00, ioaddr + ULTRA32_CFG6); /* Disable Interrupts. */
- outb(0x00, ioaddr + 6); /* Disable interrupts. */
- free_irq(dev->irq, dev);
- NS8390_init(dev, 0);
- return 0;
- }
- static void ultra32_reset_8390(struct net_device *dev)
- {
- int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET; /* ASIC base addr */
- outb(ULTRA32_RESET, ioaddr);
- if (ei_debug > 1) printk("resetting Ultra32, t=%ld...", jiffies);
- ei_status.txing = 0;
- outb(ULTRA32_MEMENB, ioaddr); /* Enable Shared Memory. */
- outb(0x80, ioaddr + ULTRA32_CFG6); /* Enable Interrupts. */
- outb(0x84, ioaddr + 5); /* Enable MEM16 & Disable Bus Master. */
- outb(0x01, ioaddr + 6); /* Enable Interrupts. */
- if (ei_debug > 1) printk("reset donen");
- return;
- }
- /* Grab the 8390 specific header. Similar to the block_input routine, but
- we don't need to be concerned with ring wrap as the header will be at
- the start of a page, so we optimize accordingly. */
- static void ultra32_get_8390_hdr(struct net_device *dev,
- struct e8390_pkt_hdr *hdr,
- int ring_page)
- {
- unsigned long hdr_start = dev->mem_start + ((ring_page & 0x1f) << 8);
- unsigned int RamReg = dev->base_addr - ULTRA32_NIC_OFFSET + ULTRA32_CFG3;
- /* Select correct 8KB Window. */
- outb(ei_status.reg0 | ((ring_page & 0x60) >> 5), RamReg);
- #ifdef notdef
- /* Officially this is what we are doing, but the readl() is faster */
- isa_memcpy_fromio(hdr, hdr_start, sizeof(struct e8390_pkt_hdr));
- #else
- ((unsigned int*)hdr)[0] = isa_readl(hdr_start);
- #endif
- }
- /* Block input and output are easy on shared memory ethercards, the only
- complication is when the ring buffer wraps, or in this case, when a
- packet spans an 8KB boundary. Note that the current 8KB segment is
- already set by the get_8390_hdr routine. */
- static void ultra32_block_input(struct net_device *dev,
- int count,
- struct sk_buff *skb,
- int ring_offset)
- {
- unsigned long xfer_start = dev->mem_start + (ring_offset & 0x1fff);
- unsigned int RamReg = dev->base_addr - ULTRA32_NIC_OFFSET + ULTRA32_CFG3;
- if ((ring_offset & ~0x1fff) != ((ring_offset + count - 1) & ~0x1fff)) {
- int semi_count = 8192 - (ring_offset & 0x1FFF);
- isa_memcpy_fromio(skb->data, xfer_start, semi_count);
- count -= semi_count;
- if (ring_offset < 96*256) {
- /* Select next 8KB Window. */
- ring_offset += semi_count;
- outb(ei_status.reg0 | ((ring_offset & 0x6000) >> 13), RamReg);
- isa_memcpy_fromio(skb->data + semi_count, dev->mem_start, count);
- } else {
- /* Select first 8KB Window. */
- outb(ei_status.reg0, RamReg);
- isa_memcpy_fromio(skb->data + semi_count, dev->rmem_start, count);
- }
- } else {
- /* Packet is in one chunk -- we can copy + cksum. */
- isa_eth_io_copy_and_sum(skb, xfer_start, count, 0);
- }
- }
- static void ultra32_block_output(struct net_device *dev,
- int count,
- const unsigned char *buf,
- int start_page)
- {
- unsigned long xfer_start = dev->mem_start + (start_page<<8);
- unsigned int RamReg = dev->base_addr - ULTRA32_NIC_OFFSET + ULTRA32_CFG3;
- /* Select first 8KB Window. */
- outb(ei_status.reg0, RamReg);
- isa_memcpy_toio(xfer_start, buf, count);
- }
- #ifdef MODULE
- #define MAX_ULTRA32_CARDS 4 /* Max number of Ultra cards per module */
- static struct net_device dev_ultra[MAX_ULTRA32_CARDS];
- int init_module(void)
- {
- int this_dev, found = 0;
- for (this_dev = 0; this_dev < MAX_ULTRA32_CARDS; this_dev++) {
- struct net_device *dev = &dev_ultra[this_dev];
- dev->init = ultra32_probe;
- if (register_netdev(dev) != 0) {
- if (found > 0) { /* Got at least one. */
- return 0;
- }
- printk(KERN_WARNING "smc-ultra32.c: No SMC Ultra32 found.n");
- return -ENXIO;
- }
- found++;
- }
- return 0;
- }
- void cleanup_module(void)
- {
- int this_dev;
- for (this_dev = 0; this_dev < MAX_ULTRA32_CARDS; this_dev++) {
- struct net_device *dev = &dev_ultra[this_dev];
- if (dev->priv != NULL) {
- int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET;
- void *priv = dev->priv;
- /* NB: ultra32_close_card() does free_irq */
- release_region(ioaddr, ULTRA32_IO_EXTENT);
- unregister_netdev(dev);
- kfree(priv);
- }
- }
- }
- #endif /* MODULE */
- MODULE_LICENSE("GPL");