/* hp-plus.c: A HP PCLAN/plus ethernet driver for linux. */ /* Written 1994 by Donald Becker. This driver is for the Hewlett Packard PC LAN (27***) plus ethercards. These cards are sold under several model numbers, usually 2724*. This software may be used and distributed according to the terms of the GNU General Public License, incorporated herein by reference. The author may be reached as becker@scyld.com, or C/O Scyld Computing Corporation 410 Severn Ave., Suite 210 Annapolis MD 21403 As is often the case, a great deal of credit is owed to Russ Nelson. The Crynwr packet driver was my primary source of HP-specific programming information. */ static const char version[] = "hp-plus.c:v1.10 9/24/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n"; #include <linux/module.h> #include <linux/string.h> /* Important -- this inlines word moves. */ #include <linux/kernel.h> #include <linux/errno.h> #include <linux/ioport.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/init.h> #include <linux/delay.h> #include <asm/system.h> #include <asm/io.h> #include "8390.h" #define DRV_NAME "hp-plus" /* A zero-terminated list of I/O addresses to be probed. */ static unsigned int hpplus_portlist[] __initdata = {0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0}; /* The HP EtherTwist chip implementation is a fairly routine DP8390 implementation. It allows both shared memory and programmed-I/O buffer access, using a custom interface for both. The programmed-I/O mode is entirely implemented in the HP EtherTwist chip, bypassing the problem ridden built-in 8390 facilities used on NE2000 designs. The shared memory mode is likewise special, with an offset register used to make packets appear at the shared memory base. Both modes use a base and bounds page register to hide the Rx ring buffer wrap -- a packet that spans the end of physical buffer memory appears continuous to the driver. (c.f. the 3c503 and Cabletron E2100) A special note: the internal buffer of the board is only 8 bits wide. This lays several nasty traps for the unaware: - the 8390 must be programmed for byte-wide operations - all I/O and memory operations must work on whole words (the access latches are serially preloaded and have no byte-swapping ability). This board is laid out in I/O space much like the earlier HP boards: the first 16 locations are for the board registers, and the second 16 are for the 8390. The board is easy to identify, with both a dedicated 16 bit ID register and a constant 0x530* value in the upper bits of the paging register. */ #define HP_ID 0x00 /* ID register, always 0x4850. */ #define HP_PAGING 0x02 /* Registers visible @ 8-f, see PageName. */ #define HPP_OPTION 0x04 /* Bitmapped options, see HP_Option. */ #define HPP_OUT_ADDR 0x08 /* I/O output location in Perf_Page. */ #define HPP_IN_ADDR 0x0A /* I/O input location in Perf_Page. */ #define HP_DATAPORT 0x0c /* I/O data transfer in Perf_Page. */ #define NIC_OFFSET 0x10 /* Offset to the 8390 registers. */ #define HP_IO_EXTENT 32 #define HP_START_PG 0x00 /* First page of TX buffer */ #define HP_STOP_PG 0x80 /* Last page +1 of RX ring */ /* The register set selected in HP_PAGING. */ enum PageName { Perf_Page = 0, /* Normal operation. */ MAC_Page = 1, /* The ethernet address (+checksum). */ HW_Page = 2, /* EEPROM-loaded hardware parameters. */ LAN_Page = 4, /* Transceiver selection, testing, etc. */ ID_Page = 6 }; /* The bit definitions for the HPP_OPTION register. */ enum HP_Option { NICReset = 1, ChipReset = 2, /* Active low, really UNreset. */ EnableIRQ = 4, FakeIntr = 8, BootROMEnb = 0x10, IOEnb = 0x20, MemEnable = 0x40, ZeroWait = 0x80, MemDisable = 0x1000, }; static int hpp_probe1(struct net_device *dev, int ioaddr); static void hpp_reset_8390(struct net_device *dev); static int hpp_open(struct net_device *dev); static int hpp_close(struct net_device *dev); static void hpp_mem_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset); static void hpp_mem_block_output(struct net_device *dev, int count, const unsigned char *buf, int start_page); static void hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page); static void hpp_io_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset); static void hpp_io_block_output(struct net_device *dev, int count, const unsigned char *buf, int start_page); static void hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page); /* Probe a list of addresses for an HP LAN+ adaptor. This routine is almost boilerplate. */ static int __init do_hpp_probe(struct net_device *dev) { int i; int base_addr = dev->base_addr; int irq = dev->irq; SET_MODULE_OWNER(dev); if (base_addr > 0x1ff) /* Check a single specified location. */ return hpp_probe1(dev, base_addr); else if (base_addr != 0) /* Don't probe at all. */ return -ENXIO; for (i = 0; hpplus_portlist[i]; i++) { if (hpp_probe1(dev, hpplus_portlist[i]) == 0) return 0; dev->irq = irq; } return -ENODEV; } #ifndef MODULE struct net_device * __init hp_plus_probe(int unit) { struct net_device *dev = alloc_ei_netdev(); int err; if (!dev) return ERR_PTR(-ENOMEM); sprintf(dev->name, "eth%d", unit); netdev_boot_setup_check(dev); err = do_hpp_probe(dev); if (err) goto out; return dev; out: free_netdev(dev); return ERR_PTR(err); } #endif /* Do the interesting part of the probe at a single address. */ static int __init hpp_probe1(struct net_device *dev, int ioaddr) { int i, retval; unsigned char checksum = 0; const char name[] = "HP-PC-LAN+"; int mem_start; static unsigned version_printed; if (!request_region(ioaddr, HP_IO_EXTENT, DRV_NAME)) return -EBUSY; /* Check for the HP+ signature, 50 48 0x 53. */ if (inw(ioaddr + HP_ID) != 0x4850 || (inw(ioaddr + HP_PAGING) & 0xfff0) != 0x5300) { retval = -ENODEV; goto out; } if (ei_debug && version_printed++ == 0) printk(version); printk("%s: %s at %#3x,", dev->name, name, ioaddr); /* Retrieve and checksum the station address. */ outw(MAC_Page, ioaddr + HP_PAGING); for(i = 0; i < ETHER_ADDR_LEN; i++) { unsigned char inval = inb(ioaddr + 8 + i); dev->dev_addr[i] = inval; checksum += inval; printk(" %2.2x", inval); } checksum += inb(ioaddr + 14); if (checksum != 0xff) { printk(" bad checksum %2.2x.\n", checksum); retval = -ENODEV; goto out; } else { /* Point at the Software Configuration Flags. */ outw(ID_Page, ioaddr + HP_PAGING); printk(" ID %4.4x", inw(ioaddr + 12)); } /* Read the IRQ line. */ outw(HW_Page, ioaddr + HP_PAGING); { int irq = inb(ioaddr + 13) & 0x0f; int option = inw(ioaddr + HPP_OPTION); dev->irq = irq; if (option & MemEnable) { mem_start = inw(ioaddr + 9) << 8; printk(", IRQ %d, memory address %#x.\n", irq, mem_start); } else { mem_start = 0; printk(", IRQ %d, programmed-I/O mode.\n", irq); } } /* Set the wrap registers for string I/O reads. */ outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14); /* Set the base address to point to the NIC, not the "real" base! */ dev->base_addr = ioaddr + NIC_OFFSET; dev->open = &hpp_open; dev->stop = &hpp_close; #ifdef CONFIG_NET_POLL_CONTROLLER dev->poll_controller = ei_poll; #endif ei_status.name = name; ei_status.word16 = 0; /* Agggghhhhh! Debug time: 2 days! */ ei_status.tx_start_page = HP_START_PG; ei_status.rx_start_page = HP_START_PG + TX_PAGES/2; ei_status.stop_page = HP_STOP_PG; ei_status.reset_8390 = &hpp_reset_8390; ei_status.block_input = &hpp_io_block_input; ei_status.block_output = &hpp_io_block_output; ei_status.get_8390_hdr = &hpp_io_get_8390_hdr; /* Check if the memory_enable flag is set in the option register. */ if (mem_start) { ei_status.block_input = &hpp_mem_block_input; ei_status.block_output = &hpp_mem_block_output; ei_status.get_8390_hdr = &hpp_mem_get_8390_hdr; dev->mem_start = mem_start; ei_status.mem = ioremap(mem_start, (HP_STOP_PG - HP_START_PG)*256); if (!ei_status.mem) { retval = -ENOMEM; goto out; } ei_status.rmem_start = dev->mem_start + TX_PAGES/2*256; dev->mem_end = ei_status.rmem_end = dev->mem_start + (HP_STOP_PG - HP_START_PG)*256; } outw(Perf_Page, ioaddr + HP_PAGING); NS8390_init(dev, 0); /* Leave the 8390 and HP chip reset. */ outw(inw(ioaddr + HPP_OPTION) & ~EnableIRQ, ioaddr + HPP_OPTION); retval = register_netdev(dev); if (retval) goto out1; return 0; out1: iounmap(ei_status.mem); out: release_region(ioaddr, HP_IO_EXTENT); return retval; } static int hpp_open(struct net_device *dev) { int ioaddr = dev->base_addr - NIC_OFFSET; int option_reg; int retval; if ((retval = request_irq(dev->irq, ei_interrupt, 0, dev->name, dev))) { return retval; } /* Reset the 8390 and HP chip. */ option_reg = inw(ioaddr + HPP_OPTION); outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION); udelay(5); /* Unreset the board and enable interrupts. */ outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION); /* Set the wrap registers for programmed-I/O operation. */ outw(HW_Page, ioaddr + HP_PAGING); outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14); /* Select the operational page. */ outw(Perf_Page, ioaddr + HP_PAGING); ei_open(dev); return 0; } static int hpp_close(struct net_device *dev) { int ioaddr = dev->base_addr - NIC_OFFSET; int option_reg = inw(ioaddr + HPP_OPTION); free_irq(dev->irq, dev); ei_close(dev); outw((option_reg & ~EnableIRQ) | MemDisable | NICReset | ChipReset, ioaddr + HPP_OPTION); return 0; } static void hpp_reset_8390(struct net_device *dev) { int ioaddr = dev->base_addr - NIC_OFFSET; int option_reg = inw(ioaddr + HPP_OPTION); if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies); outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION); /* Pause a few cycles for the hardware reset to take place. */ udelay(5); ei_status.txing = 0; outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION); udelay(5); if ((inb_p(ioaddr+NIC_OFFSET+EN0_ISR) & ENISR_RESET) == 0) printk("%s: hp_reset_8390() did not complete.\n", dev->name); if (ei_debug > 1) printk("8390 reset done (%ld).", jiffies); return; } /* The programmed-I/O version of reading the 4 byte 8390 specific header. Note that transfer with the EtherTwist+ must be on word boundaries. */ static void hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page) { int ioaddr = dev->base_addr - NIC_OFFSET; outw((ring_page<<8), ioaddr + HPP_IN_ADDR); insw(ioaddr + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1); } /* Block input and output, similar to the Crynwr packet driver. */ static void hpp_io_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset) { int ioaddr = dev->base_addr - NIC_OFFSET; char *buf = skb->data; outw(ring_offset, ioaddr + HPP_IN_ADDR); insw(ioaddr + HP_DATAPORT, buf, count>>1); if (count & 0x01) buf[count-1] = inw(ioaddr + HP_DATAPORT); } /* The corresponding shared memory versions of the above 2 functions. */ static void hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page) { int ioaddr = dev->base_addr - NIC_OFFSET; int option_reg = inw(ioaddr + HPP_OPTION); outw((ring_page<<8), ioaddr + HPP_IN_ADDR); outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION); memcpy_fromio(hdr, ei_status.mem, sizeof(struct e8390_pkt_hdr)); outw(option_reg, ioaddr + HPP_OPTION); hdr->count = (le16_to_cpu(hdr->count) + 3) & ~3; /* Round up allocation. */ } static void hpp_mem_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset) { int ioaddr = dev->base_addr - NIC_OFFSET; int option_reg = inw(ioaddr + HPP_OPTION); outw(ring_offset, ioaddr + HPP_IN_ADDR); outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION); /* Caution: this relies on get_8390_hdr() rounding up count! Also note that we *can't* use eth_io_copy_and_sum() because it will not always copy "count" bytes (e.g. padded IP). */ memcpy_fromio(skb->data, ei_status.mem, count); outw(option_reg, ioaddr + HPP_OPTION); } /* A special note: we *must* always transfer >=16 bit words. It's always safe to round up, so we do. */ static void hpp_io_block_output(struct net_device *dev, int count, const unsigned char *buf, int start_page) { int ioaddr = dev->base_addr - NIC_OFFSET; outw(start_page << 8, ioaddr + HPP_OUT_ADDR); outsl(ioaddr + HP_DATAPORT, buf, (count+3)>>2); return; } static void hpp_mem_block_output(struct net_device *dev, int count, const unsigned char *buf, int start_page) { int ioaddr = dev->base_addr - NIC_OFFSET; int option_reg = inw(ioaddr + HPP_OPTION); outw(start_page << 8, ioaddr + HPP_OUT_ADDR); outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION); memcpy_toio(ei_status.mem, buf, (count + 3) & ~3); outw(option_reg, ioaddr + HPP_OPTION); return; } #ifdef MODULE #define MAX_HPP_CARDS 4 /* Max number of HPP cards per module */ static struct net_device *dev_hpp[MAX_HPP_CARDS]; static int io[MAX_HPP_CARDS]; static int irq[MAX_HPP_CARDS]; module_param_array(io, int, NULL, 0); module_param_array(irq, int, NULL, 0); MODULE_PARM_DESC(io, "I/O port address(es)"); MODULE_PARM_DESC(irq, "IRQ number(s); ignored if properly detected"); MODULE_DESCRIPTION("HP PC-LAN+ ISA ethernet driver"); MODULE_LICENSE("GPL"); /* This is set up so that only a single autoprobe takes place per call. ISA device autoprobes on a running machine are not recommended. */ int init_module(void) { struct net_device *dev; int this_dev, found = 0; for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) { if (io[this_dev] == 0) { if (this_dev != 0) break; /* only autoprobe 1st one */ printk(KERN_NOTICE "hp-plus.c: Presently autoprobing (not recommended) for a single card.\n"); } dev = alloc_ei_netdev(); if (!dev) break; dev->irq = irq[this_dev]; dev->base_addr = io[this_dev]; if (do_hpp_probe(dev) == 0) { dev_hpp[found++] = dev; continue; } free_netdev(dev); printk(KERN_WARNING "hp-plus.c: No HP-Plus card found (i/o = 0x%x).\n", io[this_dev]); break; } if (found) return 0; return -ENXIO; } static void cleanup_card(struct net_device *dev) { /* NB: hpp_close() handles free_irq */ iounmap(ei_status.mem); release_region(dev->base_addr - NIC_OFFSET, HP_IO_EXTENT); } void cleanup_module(void) { int this_dev; for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) { struct net_device *dev = dev_hpp[this_dev]; if (dev) { unregister_netdev(dev); cleanup_card(dev); free_netdev(dev); } } } #endif /* MODULE */