patch-2.0.31 linux/drivers/net/smc-ultra32.c

• Lines: 414
• Date: Tue Aug 12 16:04:57 1997
• Orig file: v2.0.30/linux/drivers/net/smc-ultra32.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.0.30/linux/drivers/net/smc-ultra32.c linux/drivers/net/smc-ultra32.c
@@ -0,0 +1,413 @@
+/* 	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 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 v1.00\n";
+
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+
+#include <asm/io.h>
+#include <asm/system.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include "8390.h"
+
+int ultra32_probe(struct device *dev);
+int ultra32_probe1(struct device *dev, int ioaddr);
+static int ultra32_open(struct device *dev);
+static void ultra32_reset_8390(struct device *dev);
+static void ultra32_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr,
+				 int ring_page);
+static void ultra32_block_input(struct device *dev, int count,
+				struct sk_buff *skb, int ring_offset);
+static void ultra32_block_output(struct device *dev, int count,
+				 const unsigned char *buf, const start_page);
+static int ultra32_close(struct 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 ultra32_probe(struct device *dev)
+{
+	const char *ifmap[] = {"UTP No Link", "", "UTP/AUI", "UTP/BNC"};
+	int ioaddr, edge, media;
+
+	if (!EISA_bus) return ENODEV;
+
+	/* EISA spec allows for up to 16 slots, but 8 is typical. */
+	for (ioaddr = 0x1000 + ULTRA32_BASE; ioaddr < 0x9000; ioaddr += 0x1000)
+	if (check_region(ioaddr, ULTRA32_IO_EXTENT) == 0 &&
+	    inb(ioaddr + ULTRA32_IDPORT) != 0xff &&
+	    inl(ioaddr + ULTRA32_IDPORT) == ULTRA32_ID) {
+		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"));
+		if (ultra32_probe1(dev, ioaddr) == 0)
+		  return 0;
+	}
+	return ENODEV;
+}
+
+int ultra32_probe1(struct device *dev, int ioaddr)
+{
+	int i;
+	int checksum = 0;
+	const char *model_name;
+	static unsigned version_printed = 0;
+	/* Values from various config regs. */
+	unsigned char idreg = inb(ioaddr + 7);
+	unsigned char reg4 = inb(ioaddr + 4) & 0x7f;
+
+	/* Check the ID nibble. */
+	if ((idreg & 0xf0) != 0x20) 			/* SMC Ultra */
+		return ENODEV;
+
+	/* 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)
+		return ENODEV;
+
+	/* We should have a "dev" from Space.c or the static module table. */
+	if (dev == NULL) {
+		printk("smc-ultra32.c: Passed a NULL device.\n");
+		dev = init_etherdev(0, 0);
+	}
+
+	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");
+		return ENODEV;
+	}
+	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");
+			return -EAGAIN;
+		}
+		dev->irq = irq;
+	}
+
+	/* Allocate dev->priv and fill in 8390 specific dev fields. */
+	if (ethdev_init(dev)) {
+		printk (", no memory for dev->priv.\n");
+                return -ENOMEM;
+        }
+
+	/* OK, we are certain this is going to work.  Setup the device. */
+	request_region(ioaddr, ULTRA32_IO_EXTENT, model_name);
+
+	/* 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;
+}
+
+static int ultra32_open(struct device *dev)
+{
+	int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET; /* ASIC addr */
+
+	if (request_irq(dev->irq, ei_interrupt, 0, ei_status.name, NULL))
+		return -EAGAIN;
+
+	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);
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+static int ultra32_close(struct device *dev)
+{
+	int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET; /* CMDREG */
+
+	dev->start = 0;
+	dev->tbusy = 1;
+
+	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, NULL);
+	irq2dev_map[dev->irq] = 0;
+
+	NS8390_init(dev, 0);
+
+	MOD_DEC_USE_COUNT;
+
+	return 0;
+}
+
+static void ultra32_reset_8390(struct 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 done\n");
+	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 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 */
+	memcpy_fromio(hdr, hdr_start, sizeof(struct e8390_pkt_hdr));
+#else
+	((unsigned int*)hdr)[0] = 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 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);
+		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);
+			memcpy_fromio(skb->data + semi_count, dev->mem_start, count);
+		} else {
+			/* Select first 8KB Window. */
+			outb(ei_status.reg0, RamReg);
+			memcpy_fromio(skb->data + semi_count, dev->rmem_start, count);
+		}
+	} else {
+		/* Packet is in one chunk -- we can copy + cksum. */
+		eth_io_copy_and_sum(skb, xfer_start, count, 0);
+	}
+}
+
+static void ultra32_block_output(struct 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);
+
+	memcpy_toio(xfer_start, buf, count);
+}
+
+#ifdef MODULE
+#define MAX_ULTRA32_CARDS   4	/* Max number of Ultra cards per module */
+#define NAMELEN		    8	/* # of chars for storing dev->name */
+static char namelist[NAMELEN * MAX_ULTRA32_CARDS] = { 0, };
+static struct device dev_ultra[MAX_ULTRA32_CARDS] = {
+	{
+		NULL,		/* assign a chunk of namelist[] below */
+		0, 0, 0, 0,
+		0, 0,
+		0, 0, 0, NULL, NULL
+	},
+};
+
+int init_module(void)
+{
+	int this_dev, found = 0;
+
+	for (this_dev = 0; this_dev < MAX_ULTRA32_CARDS; this_dev++) {
+		struct device *dev = &dev_ultra[this_dev];
+		dev->name = namelist+(NAMELEN*this_dev);
+		dev->init = ultra32_probe;
+		if (register_netdev(dev) != 0) {
+			if (found > 0) return 0; /* Got at least one. */
+			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 device *dev = &dev_ultra[this_dev];
+		if (dev->priv != NULL) {
+			/* NB: ultra32_close_card() does free_irq + irq2dev */
+			int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET;
+			kfree(dev->priv);
+			dev->priv = NULL;
+			release_region(ioaddr, ULTRA32_IO_EXTENT);
+			unregister_netdev(dev);
+		}
+	}
+}
+#endif /* MODULE */