/* 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 char *version = "hp-plus.c:v1.10 9/24/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n"; #include /* Important -- this inlines word moves. */ #include #include #include #include #include #include #include #include #include "8390.h" extern struct device *init_etherdev(struct device *dev, int sizeof_private, unsigned long *mem_startp); /* 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 hpplus_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 int hpp_mem_block_input(struct device *dev, int count, char *buf, int ring_offset); static void hpp_mem_block_output(struct device *dev, int count, const unsigned char *buf, const start_page); static int hpp_io_block_input(struct device *dev, int count, char *buf, int ring_offset); static void hpp_io_block_output(struct device *dev, int count, const unsigned char *buf, const start_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; char *name = "HP-PC-LAN+"; int mem_start; /* Check for the HP+ signature, 50 48 0x 53. */ if (inw(ioaddr + HP_ID) != 0x4850 || (inw(ioaddr + HP_PAGING) & 0xfff0) != 0x5300) return ENODEV; if (dev == NULL) dev = init_etherdev(0, sizeof(struct ei_device), 0); 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)); } /* 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); } } printk( "%s%s", KERN_INFO, version); /* 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; ethdev_init(dev); 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; /* 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; 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")) { 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); return ei_open(dev); } 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); irq2dev_map[dev->irq] = NULL; NS8390_init(dev, 0); outw((option_reg & ~EnableIRQ) | MemDisable | NICReset | ChipReset, ioaddr + HPP_OPTION); 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; } /* Block input and output, similar to the Crynwr packet driver. Note that transfer with the EtherTwist+ must be on word boundaries. */ static int hpp_io_block_input(struct device *dev, int count, char *buf, int ring_offset) { int ioaddr = dev->base_addr - NIC_OFFSET; outw(ring_offset, ioaddr + HPP_IN_ADDR); insw(ioaddr + HP_DATAPORT, buf, count>>1); if (count & 0x01) buf[count-1] = inw(ioaddr + HP_DATAPORT); return ring_offset + count; } static int hpp_mem_block_input(struct device *dev, int count, char *buf, 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 8390.c rounding up allocations! */ memcpy(buf, (char*)dev->mem_start, (count + 3) & ~3); outw(option_reg, ioaddr + HPP_OPTION); return ring_offset + count; } /* 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 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 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((char *)dev->mem_start, buf, (count + 3) & ~3); outw(option_reg, ioaddr + HPP_OPTION); return; } /* * 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: */