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Diffstat (limited to 'linux/src/drivers/net/hp-plus.c')
| -rw-r--r-- | linux/src/drivers/net/hp-plus.c | 483 |
1 files changed, 483 insertions, 0 deletions
diff --git a/linux/src/drivers/net/hp-plus.c b/linux/src/drivers/net/hp-plus.c new file mode 100644 index 0000000..c8e3611 --- /dev/null +++ b/linux/src/drivers/net/hp-plus.c @@ -0,0 +1,483 @@ +/* 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 Public License, incorporated herein by reference. + + The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O + + Center of Excellence in Space Data and Information Sciences + Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771 + + 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/sched.h> +#include <linux/errno.h> +#include <linux/ioport.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> + +#include <asm/system.h> +#include <asm/io.h> + + +#include "8390.h" + +/* A zero-terminated list of I/O addresses to be probed. */ +static unsigned int hpplus_portlist[] = +{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, }; + +int hp_plus_probe(struct device *dev); +int hpp_probe1(struct device *dev, int ioaddr); + +static void hpp_reset_8390(struct device *dev); +static int hpp_open(struct device *dev); +static int hpp_close(struct device *dev); +static void hpp_mem_block_input(struct device *dev, int count, + struct sk_buff *skb, int ring_offset); +static void hpp_mem_block_output(struct device *dev, int count, + const unsigned char *buf, const int start_page); +static void hpp_mem_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, + int ring_page); +static void hpp_io_block_input(struct device *dev, int count, + struct sk_buff *skb, int ring_offset); +static void hpp_io_block_output(struct device *dev, int count, + const unsigned char *buf, const int start_page); +static void hpp_io_get_8390_hdr(struct 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. */ +#ifdef HAVE_DEVLIST +/* Support for a alternate probe manager, which will eliminate the + boilerplate below. */ +struct netdev_entry hpplus_drv = +{"hpplus", hpp_probe1, HP_IO_EXTENT, hpplus_portlist}; +#else + +int hp_plus_probe(struct device *dev) +{ + int i; + int base_addr = dev ? dev->base_addr : 0; + + 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++) { + int ioaddr = hpplus_portlist[i]; + if (check_region(ioaddr, HP_IO_EXTENT)) + continue; + if (hpp_probe1(dev, ioaddr) == 0) + return 0; + } + + return ENODEV; +} +#endif + +/* Do the interesting part of the probe at a single address. */ +int hpp_probe1(struct device *dev, int ioaddr) +{ + int i; + unsigned char checksum = 0; + const char *name = "HP-PC-LAN+"; + int mem_start; + static unsigned version_printed = 0; + + /* Check for the HP+ signature, 50 48 0x 53. */ + if (inw(ioaddr + HP_ID) != 0x4850 + || (inw(ioaddr + HP_PAGING) & 0xfff0) != 0x5300) + return ENODEV; + + /* We should have a "dev" from Space.c or the static module table. */ + if (dev == NULL) { + printk("hp-plus.c: Passed a NULL device.\n"); + dev = init_etherdev(0, 0); + } + + 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); + return ENODEV; + } else { + /* Point at the Software Configuration Flags. */ + outw(ID_Page, ioaddr + HP_PAGING); + printk(" ID %4.4x", inw(ioaddr + 12)); + } + + /* Allocate dev->priv and fill in 8390 specific dev fields. */ + if (ethdev_init(dev)) { + printk ("hp-plus.c: unable to allocate memory for dev->priv.\n"); + return -ENOMEM; + } + + /* Grab the region so we can find another board if something fails. */ + request_region(ioaddr, HP_IO_EXTENT,"hp-plus"); + + /* 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_2X_PAGES) | ((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; + + 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_2X_PAGES; + 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; + dev->rmem_start = dev->mem_start + TX_2X_PAGES*256; + dev->mem_end = dev->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); + + return 0; +} + +static int +hpp_open(struct device *dev) +{ + int ioaddr = dev->base_addr - NIC_OFFSET; + int option_reg; + + if (request_irq(dev->irq, &ei_interrupt, 0, "hp-plus", NULL)) { + return -EAGAIN; + } + + /* Reset the 8390 and HP chip. */ + option_reg = inw(ioaddr + HPP_OPTION); + outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION); + SLOW_DOWN_IO; SLOW_DOWN_IO; + /* 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_2X_PAGES) | ((HP_STOP_PG - 1) << 8), ioaddr + 14); + + /* Select the operational page. */ + outw(Perf_Page, ioaddr + HP_PAGING); + + ei_open(dev); + MOD_INC_USE_COUNT; + return 0; +} + +static int +hpp_close(struct device *dev) +{ + int ioaddr = dev->base_addr - NIC_OFFSET; + int option_reg = inw(ioaddr + HPP_OPTION); + + free_irq(dev->irq, NULL); + irq2dev_map[dev->irq] = NULL; + ei_close(dev); + outw((option_reg & ~EnableIRQ) | MemDisable | NICReset | ChipReset, + ioaddr + HPP_OPTION); + + MOD_DEC_USE_COUNT; + return 0; +} + +static void +hpp_reset_8390(struct 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. */ + SLOW_DOWN_IO; + SLOW_DOWN_IO; + ei_status.txing = 0; + outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION); + + SLOW_DOWN_IO; SLOW_DOWN_IO; + + + 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 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 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 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, dev->mem_start, sizeof(struct e8390_pkt_hdr)); + outw(option_reg, ioaddr + HPP_OPTION); + hdr->count = (hdr->count + 3) & ~3; /* Round up allocation. */ +} + +static void +hpp_mem_block_input(struct 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, dev->mem_start, 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 device *dev, int count, + const unsigned char *buf, const 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 device *dev, int count, + const unsigned char *buf, const 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(dev->mem_start, 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 */ +#define NAMELEN 8 /* # of chars for storing dev->name */ +static char namelist[NAMELEN * MAX_HPP_CARDS] = { 0, }; +static struct device dev_hpp[MAX_HPP_CARDS] = { + { + NULL, /* assign a chunk of namelist[] below */ + 0, 0, 0, 0, + 0, 0, + 0, 0, 0, NULL, NULL + }, +}; + +static int io[MAX_HPP_CARDS] = { 0, }; +static int irq[MAX_HPP_CARDS] = { 0, }; + +/* 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) +{ + int this_dev, found = 0; + + for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) { + struct device *dev = &dev_hpp[this_dev]; + dev->name = namelist+(NAMELEN*this_dev); + dev->irq = irq[this_dev]; + dev->base_addr = io[this_dev]; + dev->init = hp_plus_probe; + 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"); + } + if (register_netdev(dev) != 0) { + printk(KERN_WARNING "hp-plus.c: No HP-Plus card found (i/o = 0x%x).\n", io[this_dev]); + if (found != 0) return 0; /* Got at least one. */ + return -ENXIO; + } + found++; + } + + return 0; +} + +void +cleanup_module(void) +{ + int this_dev; + + for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) { + struct device *dev = &dev_hpp[this_dev]; + if (dev->priv != NULL) { + /* NB: hpp_close() handles free_irq + irq2dev map */ + int ioaddr = dev->base_addr - NIC_OFFSET; + kfree(dev->priv); + dev->priv = NULL; + release_region(ioaddr, HP_IO_EXTENT); + unregister_netdev(dev); + } + } +} +#endif /* MODULE */ + +/* + * Local variables: + * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c hp-plus.c" + * version-control: t + * kept-new-versions: 5 + * tab-width: 4 + * c-indent-level: 4 + * End: + */ |