453 lines
13 KiB
C
453 lines
13 KiB
C
/* smc-ultra32.c: An SMC Ultra32 EISA ethernet driver for linux.
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Sources:
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This driver is based on (cloned from) the ISA SMC Ultra driver
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written by Donald Becker. Modifications to support the EISA
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version of the card by Paul Gortmaker and Leonard N. Zubkoff.
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This software may be used and distributed according to the terms
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of the GNU General Public License, incorporated herein by reference.
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Theory of Operation:
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The SMC Ultra32C card uses the SMC 83c790 chip which is also
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found on the ISA SMC Ultra cards. It has a shared memory mode of
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operation that makes it similar to the ISA version of the card.
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The main difference is that the EISA card has 32KB of RAM, but
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only an 8KB window into that memory. The EISA card also can be
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set for a bus-mastering mode of operation via the ECU, but that
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is not (and probably will never be) supported by this driver.
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The ECU should be run to enable shared memory and to disable the
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bus-mastering feature for use with linux.
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By programming the 8390 to use only 8KB RAM, the modifications
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to the ISA driver can be limited to the probe and initialization
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code. This allows easy integration of EISA support into the ISA
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driver. However, the driver development kit from SMC provided the
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register information for sliding the 8KB window, and hence the 8390
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is programmed to use the full 32KB RAM.
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Unfortunately this required code changes outside the probe/init
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routines, and thus we decided to separate the EISA driver from
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the ISA one. In this way, ISA users don't end up with a larger
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driver due to the EISA code, and EISA users don't end up with a
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larger driver due to the ISA EtherEZ PIO code. The driver is
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similar to the 3c503/16 driver, in that the window must be set
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back to the 1st 8KB of space for access to the two 8390 Tx slots.
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In testing, using only 8KB RAM (3 Tx / 5 Rx) didn't appear to
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be a limiting factor, since the EISA bus could get packets off
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the card fast enough, but having the use of lots of RAM as Rx
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space is extra insurance if interrupt latencies become excessive.
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*/
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static const char *version = "smc-ultra32.c: 06/97 v1.00\n";
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#include <linux/module.h>
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#include <linux/eisa.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <asm/io.h>
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#include <asm/system.h>
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#include "8390.h"
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#define DRV_NAME "smc-ultra32"
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static int ultra32_probe1(struct net_device *dev, int ioaddr);
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static int ultra32_open(struct net_device *dev);
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static void ultra32_reset_8390(struct net_device *dev);
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static void ultra32_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
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int ring_page);
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static void ultra32_block_input(struct net_device *dev, int count,
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struct sk_buff *skb, int ring_offset);
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static void ultra32_block_output(struct net_device *dev, int count,
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const unsigned char *buf,
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const int start_page);
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static int ultra32_close(struct net_device *dev);
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#define ULTRA32_CMDREG 0 /* Offset to ASIC command register. */
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#define ULTRA32_RESET 0x80 /* Board reset, in ULTRA32_CMDREG. */
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#define ULTRA32_MEMENB 0x40 /* Enable the shared memory. */
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#define ULTRA32_NIC_OFFSET 16 /* NIC register offset from the base_addr. */
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#define ULTRA32_IO_EXTENT 32
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#define EN0_ERWCNT 0x08 /* Early receive warning count. */
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/*
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* Defines that apply only to the Ultra32 EISA card. Note that
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* "smc" = 10011 01101 00011 = 0x4da3, and hence !smc8010.cfg translates
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* into an EISA ID of 0x1080A34D
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*/
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#define ULTRA32_BASE 0xca0
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#define ULTRA32_ID 0x1080a34d
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#define ULTRA32_IDPORT (-0x20) /* 0xc80 */
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/* Config regs 1->7 from the EISA !SMC8010.CFG file. */
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#define ULTRA32_CFG1 0x04 /* 0xca4 */
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#define ULTRA32_CFG2 0x05 /* 0xca5 */
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#define ULTRA32_CFG3 (-0x18) /* 0xc88 */
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#define ULTRA32_CFG4 (-0x17) /* 0xc89 */
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#define ULTRA32_CFG5 (-0x16) /* 0xc8a */
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#define ULTRA32_CFG6 (-0x15) /* 0xc8b */
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#define ULTRA32_CFG7 0x0d /* 0xcad */
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static void cleanup_card(struct net_device *dev)
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{
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int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET;
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/* NB: ultra32_close_card() does free_irq */
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release_region(ioaddr, ULTRA32_IO_EXTENT);
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iounmap(ei_status.mem);
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}
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/* Probe for the Ultra32. This looks like a 8013 with the station
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address PROM at I/O ports <base>+8 to <base>+13, with a checksum
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following.
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*/
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struct net_device * __init ultra32_probe(int unit)
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{
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struct net_device *dev;
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int base;
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int irq;
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int err = -ENODEV;
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if (!EISA_bus)
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return ERR_PTR(-ENODEV);
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dev = alloc_ei_netdev();
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if (!dev)
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return ERR_PTR(-ENOMEM);
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if (unit >= 0) {
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sprintf(dev->name, "eth%d", unit);
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netdev_boot_setup_check(dev);
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}
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irq = dev->irq;
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/* EISA spec allows for up to 16 slots, but 8 is typical. */
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for (base = 0x1000 + ULTRA32_BASE; base < 0x9000; base += 0x1000) {
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if (ultra32_probe1(dev, base) == 0)
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break;
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dev->irq = irq;
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}
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if (base >= 0x9000)
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goto out;
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err = register_netdev(dev);
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if (err)
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goto out1;
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return dev;
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out1:
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cleanup_card(dev);
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out:
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free_netdev(dev);
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return ERR_PTR(err);
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}
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static int __init ultra32_probe1(struct net_device *dev, int ioaddr)
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{
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int i, edge, media, retval;
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int checksum = 0;
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const char *model_name;
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static unsigned version_printed;
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/* Values from various config regs. */
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unsigned char idreg;
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unsigned char reg4;
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const char *ifmap[] = {"UTP No Link", "", "UTP/AUI", "UTP/BNC"};
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if (!request_region(ioaddr, ULTRA32_IO_EXTENT, DRV_NAME))
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return -EBUSY;
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if (inb(ioaddr + ULTRA32_IDPORT) == 0xff ||
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inl(ioaddr + ULTRA32_IDPORT) != ULTRA32_ID) {
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retval = -ENODEV;
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goto out;
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}
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media = inb(ioaddr + ULTRA32_CFG7) & 0x03;
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edge = inb(ioaddr + ULTRA32_CFG5) & 0x08;
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printk("SMC Ultra32 in EISA Slot %d, Media: %s, %s IRQs.\n",
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ioaddr >> 12, ifmap[media],
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(edge ? "Edge Triggered" : "Level Sensitive"));
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idreg = inb(ioaddr + 7);
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reg4 = inb(ioaddr + 4) & 0x7f;
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/* Check the ID nibble. */
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if ((idreg & 0xf0) != 0x20) { /* SMC Ultra */
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retval = -ENODEV;
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goto out;
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}
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/* Select the station address register set. */
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outb(reg4, ioaddr + 4);
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for (i = 0; i < 8; i++)
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checksum += inb(ioaddr + 8 + i);
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if ((checksum & 0xff) != 0xff) {
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retval = -ENODEV;
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goto out;
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}
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if (ei_debug && version_printed++ == 0)
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printk(version);
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model_name = "SMC Ultra32";
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for (i = 0; i < 6; i++)
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dev->dev_addr[i] = inb(ioaddr + 8 + i);
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printk("%s: %s at 0x%X, %pM",
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dev->name, model_name, ioaddr, dev->dev_addr);
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/* Switch from the station address to the alternate register set and
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read the useful registers there. */
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outb(0x80 | reg4, ioaddr + 4);
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/* Enable FINE16 mode to avoid BIOS ROM width mismatches @ reboot. */
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outb(0x80 | inb(ioaddr + 0x0c), ioaddr + 0x0c);
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/* Reset RAM addr. */
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outb(0x00, ioaddr + 0x0b);
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/* Switch back to the station address register set so that the
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MS-DOS driver can find the card after a warm boot. */
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outb(reg4, ioaddr + 4);
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if ((inb(ioaddr + ULTRA32_CFG5) & 0x40) == 0) {
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printk("\nsmc-ultra32: Card RAM is disabled! "
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"Run EISA config utility.\n");
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retval = -ENODEV;
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goto out;
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}
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if ((inb(ioaddr + ULTRA32_CFG2) & 0x04) == 0)
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printk("\nsmc-ultra32: Ignoring Bus-Master enable bit. "
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"Run EISA config utility.\n");
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if (dev->irq < 2) {
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unsigned char irqmap[] = {0, 9, 3, 5, 7, 10, 11, 15};
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int irq = irqmap[inb(ioaddr + ULTRA32_CFG5) & 0x07];
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if (irq == 0) {
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printk(", failed to detect IRQ line.\n");
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retval = -EAGAIN;
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goto out;
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}
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dev->irq = irq;
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}
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/* The 8390 isn't at the base address, so fake the offset */
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dev->base_addr = ioaddr + ULTRA32_NIC_OFFSET;
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/* Save RAM address in the unused reg0 to avoid excess inb's. */
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ei_status.reg0 = inb(ioaddr + ULTRA32_CFG3) & 0xfc;
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dev->mem_start = 0xc0000 + ((ei_status.reg0 & 0x7c) << 11);
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ei_status.name = model_name;
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ei_status.word16 = 1;
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ei_status.tx_start_page = 0;
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ei_status.rx_start_page = TX_PAGES;
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/* All Ultra32 cards have 32KB memory with an 8KB window. */
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ei_status.stop_page = 128;
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ei_status.mem = ioremap(dev->mem_start, 0x2000);
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if (!ei_status.mem) {
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printk(", failed to ioremap.\n");
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retval = -ENOMEM;
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goto out;
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}
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dev->mem_end = dev->mem_start + 0x1fff;
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printk(", IRQ %d, 32KB memory, 8KB window at 0x%lx-0x%lx.\n",
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dev->irq, dev->mem_start, dev->mem_end);
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ei_status.block_input = &ultra32_block_input;
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ei_status.block_output = &ultra32_block_output;
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ei_status.get_8390_hdr = &ultra32_get_8390_hdr;
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ei_status.reset_8390 = &ultra32_reset_8390;
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dev->open = &ultra32_open;
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dev->stop = &ultra32_close;
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#ifdef CONFIG_NET_POLL_CONTROLLER
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dev->poll_controller = ei_poll;
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#endif
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NS8390_init(dev, 0);
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return 0;
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out:
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release_region(ioaddr, ULTRA32_IO_EXTENT);
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return retval;
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}
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static int ultra32_open(struct net_device *dev)
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{
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int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET; /* ASIC addr */
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int irq_flags = (inb(ioaddr + ULTRA32_CFG5) & 0x08) ? 0 : IRQF_SHARED;
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int retval;
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retval = request_irq(dev->irq, ei_interrupt, irq_flags, dev->name, dev);
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if (retval)
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return retval;
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outb(ULTRA32_MEMENB, ioaddr); /* Enable Shared Memory. */
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outb(0x80, ioaddr + ULTRA32_CFG6); /* Enable Interrupts. */
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outb(0x84, ioaddr + 5); /* Enable MEM16 & Disable Bus Master. */
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outb(0x01, ioaddr + 6); /* Enable Interrupts. */
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/* Set the early receive warning level in window 0 high enough not
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to receive ERW interrupts. */
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outb_p(E8390_NODMA+E8390_PAGE0, dev->base_addr);
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outb(0xff, dev->base_addr + EN0_ERWCNT);
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ei_open(dev);
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return 0;
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}
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static int ultra32_close(struct net_device *dev)
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{
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int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET; /* CMDREG */
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netif_stop_queue(dev);
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if (ei_debug > 1)
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printk("%s: Shutting down ethercard.\n", dev->name);
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outb(0x00, ioaddr + ULTRA32_CFG6); /* Disable Interrupts. */
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outb(0x00, ioaddr + 6); /* Disable interrupts. */
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free_irq(dev->irq, dev);
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NS8390_init(dev, 0);
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return 0;
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}
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static void ultra32_reset_8390(struct net_device *dev)
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{
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int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET; /* ASIC base addr */
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outb(ULTRA32_RESET, ioaddr);
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if (ei_debug > 1) printk("resetting Ultra32, t=%ld...", jiffies);
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ei_status.txing = 0;
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outb(ULTRA32_MEMENB, ioaddr); /* Enable Shared Memory. */
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outb(0x80, ioaddr + ULTRA32_CFG6); /* Enable Interrupts. */
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outb(0x84, ioaddr + 5); /* Enable MEM16 & Disable Bus Master. */
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outb(0x01, ioaddr + 6); /* Enable Interrupts. */
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if (ei_debug > 1) printk("reset done\n");
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return;
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}
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/* Grab the 8390 specific header. Similar to the block_input routine, but
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we don't need to be concerned with ring wrap as the header will be at
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the start of a page, so we optimize accordingly. */
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static void ultra32_get_8390_hdr(struct net_device *dev,
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struct e8390_pkt_hdr *hdr,
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int ring_page)
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{
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void __iomem *hdr_start = ei_status.mem + ((ring_page & 0x1f) << 8);
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unsigned int RamReg = dev->base_addr - ULTRA32_NIC_OFFSET + ULTRA32_CFG3;
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/* Select correct 8KB Window. */
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outb(ei_status.reg0 | ((ring_page & 0x60) >> 5), RamReg);
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#ifdef __BIG_ENDIAN
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/* Officially this is what we are doing, but the readl() is faster */
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/* unfortunately it isn't endian aware of the struct */
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memcpy_fromio(hdr, hdr_start, sizeof(struct e8390_pkt_hdr));
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hdr->count = le16_to_cpu(hdr->count);
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#else
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((unsigned int*)hdr)[0] = readl(hdr_start);
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#endif
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}
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/* Block input and output are easy on shared memory ethercards, the only
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complication is when the ring buffer wraps, or in this case, when a
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packet spans an 8KB boundary. Note that the current 8KB segment is
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already set by the get_8390_hdr routine. */
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static void ultra32_block_input(struct net_device *dev,
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int count,
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struct sk_buff *skb,
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int ring_offset)
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{
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void __iomem *xfer_start = ei_status.mem + (ring_offset & 0x1fff);
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unsigned int RamReg = dev->base_addr - ULTRA32_NIC_OFFSET + ULTRA32_CFG3;
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if ((ring_offset & ~0x1fff) != ((ring_offset + count - 1) & ~0x1fff)) {
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int semi_count = 8192 - (ring_offset & 0x1FFF);
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memcpy_fromio(skb->data, xfer_start, semi_count);
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count -= semi_count;
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if (ring_offset < 96*256) {
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/* Select next 8KB Window. */
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ring_offset += semi_count;
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outb(ei_status.reg0 | ((ring_offset & 0x6000) >> 13), RamReg);
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memcpy_fromio(skb->data + semi_count, ei_status.mem, count);
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} else {
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/* Select first 8KB Window. */
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outb(ei_status.reg0, RamReg);
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memcpy_fromio(skb->data + semi_count, ei_status.mem + TX_PAGES * 256, count);
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}
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} else {
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memcpy_fromio(skb->data, xfer_start, count);
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}
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}
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static void ultra32_block_output(struct net_device *dev,
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int count,
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const unsigned char *buf,
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int start_page)
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{
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void __iomem *xfer_start = ei_status.mem + (start_page<<8);
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unsigned int RamReg = dev->base_addr - ULTRA32_NIC_OFFSET + ULTRA32_CFG3;
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/* Select first 8KB Window. */
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outb(ei_status.reg0, RamReg);
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memcpy_toio(xfer_start, buf, count);
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}
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#ifdef MODULE
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#define MAX_ULTRA32_CARDS 4 /* Max number of Ultra cards per module */
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static struct net_device *dev_ultra[MAX_ULTRA32_CARDS];
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MODULE_DESCRIPTION("SMC Ultra32 EISA ethernet driver");
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MODULE_LICENSE("GPL");
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int __init init_module(void)
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{
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int this_dev, found = 0;
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for (this_dev = 0; this_dev < MAX_ULTRA32_CARDS; this_dev++) {
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struct net_device *dev = ultra32_probe(-1);
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if (IS_ERR(dev))
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break;
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dev_ultra[found++] = dev;
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}
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if (found)
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return 0;
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printk(KERN_WARNING "smc-ultra32.c: No SMC Ultra32 found.\n");
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return -ENXIO;
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}
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void __exit cleanup_module(void)
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{
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int this_dev;
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for (this_dev = 0; this_dev < MAX_ULTRA32_CARDS; this_dev++) {
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struct net_device *dev = dev_ultra[this_dev];
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if (dev) {
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unregister_netdev(dev);
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cleanup_card(dev);
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free_netdev(dev);
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}
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}
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}
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#endif /* MODULE */
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