diff options
Diffstat (limited to 'drivers/net/smc-ultra32.c')
| -rw-r--r-- | drivers/net/smc-ultra32.c | 454 |
1 files changed, 454 insertions, 0 deletions
diff --git a/drivers/net/smc-ultra32.c b/drivers/net/smc-ultra32.c new file mode 100644 index 000000000000..b3e397d7ca85 --- /dev/null +++ b/drivers/net/smc-ultra32.c @@ -0,0 +1,454 @@ +/* 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 v1.00\n"; + + +#include <linux/module.h> +#include <linux/eisa.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> + +#include <asm/io.h> +#include <asm/system.h> + +#include "8390.h" + +#define DRV_NAME "smc-ultra32" + +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 */ + +static void cleanup_card(struct net_device *dev) +{ + int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET; + /* NB: ultra32_close_card() does free_irq */ + release_region(ioaddr, ULTRA32_IO_EXTENT); + iounmap(ei_status.mem); +} + +/* 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. +*/ + +struct net_device * __init ultra32_probe(int unit) +{ + struct net_device *dev; + int base; + int irq; + int err = -ENODEV; + + if (!EISA_bus) + return ERR_PTR(-ENODEV); + + dev = alloc_ei_netdev(); + + if (!dev) + return ERR_PTR(-ENOMEM); + + if (unit >= 0) { + sprintf(dev->name, "eth%d", unit); + netdev_boot_setup_check(dev); + } + + SET_MODULE_OWNER(dev); + + irq = dev->irq; + + /* EISA spec allows for up to 16 slots, but 8 is typical. */ + for (base = 0x1000 + ULTRA32_BASE; base < 0x9000; base += 0x1000) { + if (ultra32_probe1(dev, base) == 0) + break; + dev->irq = irq; + } + if (base >= 0x9000) + goto out; + err = register_netdev(dev); + if (err) + goto out1; + return dev; +out1: + cleanup_card(dev); +out: + free_netdev(dev); + return ERR_PTR(err); +} + +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, DRV_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; + } + + /* 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; + + ei_status.mem = ioremap(dev->mem_start, 0x2000); + if (!ei_status.mem) { + printk(", failed to ioremap.\n"); + retval = -ENOMEM; + goto out; + } + dev->mem_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; +#ifdef CONFIG_NET_POLL_CONTROLLER + dev->poll_controller = ei_poll; +#endif + 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 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 net_device *dev, + struct e8390_pkt_hdr *hdr, + int ring_page) +{ + void __iomem *hdr_start = ei_status.mem + ((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 __BIG_ENDIAN + /* Officially this is what we are doing, but the readl() is faster */ + /* unfortunately it isn't endian aware of the struct */ + memcpy_fromio(hdr, hdr_start, sizeof(struct e8390_pkt_hdr)); + hdr->count = le16_to_cpu(hdr->count); +#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 net_device *dev, + int count, + struct sk_buff *skb, + int ring_offset) +{ + void __iomem *xfer_start = ei_status.mem + (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, ei_status.mem, count); + } else { + /* Select first 8KB Window. */ + outb(ei_status.reg0, RamReg); + memcpy_fromio(skb->data + semi_count, ei_status.mem + TX_PAGES * 256, 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 net_device *dev, + int count, + const unsigned char *buf, + int start_page) +{ + void __iomem *xfer_start = ei_status.mem + (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 */ +static struct net_device *dev_ultra[MAX_ULTRA32_CARDS]; + +MODULE_DESCRIPTION("SMC Ultra32 EISA ethernet driver"); +MODULE_LICENSE("GPL"); + +int init_module(void) +{ + int this_dev, found = 0; + + for (this_dev = 0; this_dev < MAX_ULTRA32_CARDS; this_dev++) { + struct net_device *dev = ultra32_probe(-1); + if (IS_ERR(dev)) + break; + dev_ultra[found++] = dev; + } + if (found) + return 0; + printk(KERN_WARNING "smc-ultra32.c: No SMC Ultra32 found.\n"); + return -ENXIO; +} + +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) { + unregister_netdev(dev); + cleanup_card(dev); + free_netdev(dev); + } + } +} +#endif /* MODULE */ + |