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- /* 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 <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"
- 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:
- */
-