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426 lines
12 KiB
426 lines
12 KiB
/* |
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* Linux ARCnet driver - COM90xx chipset (IO-mapped buffers) |
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* |
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* Written 1997 by David Woodhouse. |
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* Written 1994-1999 by Avery Pennarun. |
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* Written 1999-2000 by Martin Mares <[email protected]>. |
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* Derived from skeleton.c by Donald Becker. |
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* |
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* Special thanks to Contemporary Controls, Inc. (www.ccontrols.com) |
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* for sponsoring the further development of this driver. |
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* |
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* ********************** |
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* |
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* The original copyright of skeleton.c was as follows: |
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* |
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* skeleton.c Written 1993 by Donald Becker. |
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* Copyright 1993 United States Government as represented by the |
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* Director, National Security Agency. This software may only be used |
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* and distributed according to the terms of the GNU General Public License as |
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* modified by SRC, incorporated herein by reference. |
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* |
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* ********************** |
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* |
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* For more details, see drivers/net/arcnet.c |
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* |
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* ********************** |
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*/ |
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#define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/ioport.h> |
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#include <linux/delay.h> |
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#include <linux/netdevice.h> |
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#include <linux/memblock.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include "arcdevice.h" |
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#include "com9026.h" |
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/* Internal function declarations */ |
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static int com90io_found(struct net_device *dev); |
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static void com90io_command(struct net_device *dev, int command); |
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static int com90io_status(struct net_device *dev); |
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static void com90io_setmask(struct net_device *dev, int mask); |
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static int com90io_reset(struct net_device *dev, int really_reset); |
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static void com90io_copy_to_card(struct net_device *dev, int bufnum, int offset, |
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void *buf, int count); |
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static void com90io_copy_from_card(struct net_device *dev, int bufnum, |
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int offset, void *buf, int count); |
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/* Handy defines for ARCnet specific stuff */ |
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/* The number of low I/O ports used by the card. */ |
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#define ARCNET_TOTAL_SIZE 16 |
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/**************************************************************************** |
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* * |
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* IO-mapped operation routines * |
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* * |
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****************************************************************************/ |
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#undef ONE_AT_A_TIME_TX |
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#undef ONE_AT_A_TIME_RX |
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static u_char get_buffer_byte(struct net_device *dev, unsigned offset) |
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{ |
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int ioaddr = dev->base_addr; |
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arcnet_outb(offset >> 8, ioaddr, COM9026_REG_W_ADDR_HI); |
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arcnet_outb(offset & 0xff, ioaddr, COM9026_REG_W_ADDR_LO); |
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return arcnet_inb(ioaddr, COM9026_REG_RW_MEMDATA); |
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} |
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#ifdef ONE_AT_A_TIME_TX |
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static void put_buffer_byte(struct net_device *dev, unsigned offset, |
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u_char datum) |
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{ |
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int ioaddr = dev->base_addr; |
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arcnet_outb(offset >> 8, ioaddr, COM9026_REG_W_ADDR_HI); |
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arcnet_outb(offset & 0xff, ioaddr, COM9026_REG_W_ADDR_LO); |
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arcnet_outb(datum, ioaddr, COM9026_REG_RW_MEMDATA); |
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} |
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#endif |
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static void get_whole_buffer(struct net_device *dev, unsigned offset, |
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unsigned length, char *dest) |
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{ |
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int ioaddr = dev->base_addr; |
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arcnet_outb((offset >> 8) | AUTOINCflag, ioaddr, COM9026_REG_W_ADDR_HI); |
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arcnet_outb(offset & 0xff, ioaddr, COM9026_REG_W_ADDR_LO); |
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while (length--) |
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#ifdef ONE_AT_A_TIME_RX |
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*(dest++) = get_buffer_byte(dev, offset++); |
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#else |
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*(dest++) = arcnet_inb(ioaddr, COM9026_REG_RW_MEMDATA); |
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#endif |
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} |
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static void put_whole_buffer(struct net_device *dev, unsigned offset, |
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unsigned length, char *dest) |
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{ |
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int ioaddr = dev->base_addr; |
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arcnet_outb((offset >> 8) | AUTOINCflag, ioaddr, COM9026_REG_W_ADDR_HI); |
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arcnet_outb(offset & 0xff, ioaddr,COM9026_REG_W_ADDR_LO); |
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while (length--) |
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#ifdef ONE_AT_A_TIME_TX |
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put_buffer_byte(dev, offset++, *(dest++)); |
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#else |
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arcnet_outb(*(dest++), ioaddr, COM9026_REG_RW_MEMDATA); |
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#endif |
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} |
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/* We cannot probe for an IO mapped card either, although we can check that |
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* it's where we were told it was, and even autoirq |
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*/ |
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static int __init com90io_probe(struct net_device *dev) |
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{ |
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int ioaddr = dev->base_addr, status; |
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unsigned long airqmask; |
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if (BUGLVL(D_NORMAL)) { |
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pr_info("%s\n", "COM90xx IO-mapped mode support (by David Woodhouse et el.)"); |
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pr_info("E-mail me if you actually test this driver, please!\n"); |
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} |
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if (!ioaddr) { |
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arc_printk(D_NORMAL, dev, "No autoprobe for IO mapped cards; you must specify the base address!\n"); |
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return -ENODEV; |
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} |
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if (!request_region(ioaddr, ARCNET_TOTAL_SIZE, "com90io probe")) { |
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arc_printk(D_INIT_REASONS, dev, "IO request_region %x-%x failed\n", |
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ioaddr, ioaddr + ARCNET_TOTAL_SIZE - 1); |
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return -ENXIO; |
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} |
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if (arcnet_inb(ioaddr, COM9026_REG_R_STATUS) == 0xFF) { |
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arc_printk(D_INIT_REASONS, dev, "IO address %x empty\n", |
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ioaddr); |
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goto err_out; |
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} |
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arcnet_inb(ioaddr, COM9026_REG_R_RESET); |
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mdelay(RESETtime); |
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status = arcnet_inb(ioaddr, COM9026_REG_R_STATUS); |
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if ((status & 0x9D) != (NORXflag | RECONflag | TXFREEflag | RESETflag)) { |
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arc_printk(D_INIT_REASONS, dev, "Status invalid (%Xh)\n", |
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status); |
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goto err_out; |
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} |
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arc_printk(D_INIT_REASONS, dev, "Status after reset: %X\n", status); |
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arcnet_outb(CFLAGScmd | RESETclear | CONFIGclear, |
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ioaddr, COM9026_REG_W_COMMAND); |
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arc_printk(D_INIT_REASONS, dev, "Status after reset acknowledged: %X\n", |
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status); |
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status = arcnet_inb(ioaddr, COM9026_REG_R_STATUS); |
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if (status & RESETflag) { |
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arc_printk(D_INIT_REASONS, dev, "Eternal reset (status=%Xh)\n", |
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status); |
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goto err_out; |
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} |
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arcnet_outb((0x16 | IOMAPflag) & ~ENABLE16flag, |
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ioaddr, COM9026_REG_RW_CONFIG); |
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/* Read first loc'n of memory */ |
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arcnet_outb(AUTOINCflag, ioaddr, COM9026_REG_W_ADDR_HI); |
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arcnet_outb(0, ioaddr, COM9026_REG_W_ADDR_LO); |
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status = arcnet_inb(ioaddr, COM9026_REG_RW_MEMDATA); |
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if (status != 0xd1) { |
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arc_printk(D_INIT_REASONS, dev, "Signature byte not found (%Xh instead).\n", |
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status); |
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goto err_out; |
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} |
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if (!dev->irq) { |
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/* if we do this, we're sure to get an IRQ since the |
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* card has just reset and the NORXflag is on until |
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* we tell it to start receiving. |
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*/ |
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airqmask = probe_irq_on(); |
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arcnet_outb(NORXflag, ioaddr, COM9026_REG_W_INTMASK); |
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udelay(1); |
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arcnet_outb(0, ioaddr, COM9026_REG_W_INTMASK); |
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dev->irq = probe_irq_off(airqmask); |
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if ((int)dev->irq <= 0) { |
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arc_printk(D_INIT_REASONS, dev, "Autoprobe IRQ failed\n"); |
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goto err_out; |
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} |
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} |
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release_region(ioaddr, ARCNET_TOTAL_SIZE); /* end of probing */ |
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return com90io_found(dev); |
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err_out: |
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release_region(ioaddr, ARCNET_TOTAL_SIZE); |
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return -ENODEV; |
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} |
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/* Set up the struct net_device associated with this card. Called after |
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* probing succeeds. |
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*/ |
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static int __init com90io_found(struct net_device *dev) |
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{ |
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struct arcnet_local *lp; |
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int ioaddr = dev->base_addr; |
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int err; |
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/* Reserve the irq */ |
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if (request_irq(dev->irq, arcnet_interrupt, 0, |
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"arcnet (COM90xx-IO)", dev)) { |
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arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", dev->irq); |
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return -ENODEV; |
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} |
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/* Reserve the I/O region */ |
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if (!request_region(dev->base_addr, ARCNET_TOTAL_SIZE, |
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"arcnet (COM90xx-IO)")) { |
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free_irq(dev->irq, dev); |
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return -EBUSY; |
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} |
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lp = netdev_priv(dev); |
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lp->card_name = "COM90xx I/O"; |
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lp->hw.command = com90io_command; |
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lp->hw.status = com90io_status; |
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lp->hw.intmask = com90io_setmask; |
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lp->hw.reset = com90io_reset; |
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lp->hw.owner = THIS_MODULE; |
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lp->hw.copy_to_card = com90io_copy_to_card; |
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lp->hw.copy_from_card = com90io_copy_from_card; |
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lp->config = (0x16 | IOMAPflag) & ~ENABLE16flag; |
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arcnet_outb(lp->config, ioaddr, COM9026_REG_RW_CONFIG); |
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/* get and check the station ID from offset 1 in shmem */ |
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dev->dev_addr[0] = get_buffer_byte(dev, 1); |
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err = register_netdev(dev); |
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if (err) { |
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arcnet_outb(arcnet_inb(ioaddr, COM9026_REG_RW_CONFIG) & ~IOMAPflag, |
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ioaddr, COM9026_REG_RW_CONFIG); |
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free_irq(dev->irq, dev); |
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release_region(dev->base_addr, ARCNET_TOTAL_SIZE); |
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return err; |
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} |
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arc_printk(D_NORMAL, dev, "COM90IO: station %02Xh found at %03lXh, IRQ %d.\n", |
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dev->dev_addr[0], dev->base_addr, dev->irq); |
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return 0; |
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} |
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/* Do a hardware reset on the card, and set up necessary registers. |
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* |
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* This should be called as little as possible, because it disrupts the |
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* token on the network (causes a RECON) and requires a significant delay. |
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* |
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* However, it does make sure the card is in a defined state. |
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*/ |
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static int com90io_reset(struct net_device *dev, int really_reset) |
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{ |
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struct arcnet_local *lp = netdev_priv(dev); |
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short ioaddr = dev->base_addr; |
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arc_printk(D_INIT, dev, "Resetting %s (status=%02Xh)\n", |
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dev->name, arcnet_inb(ioaddr, COM9026_REG_R_STATUS)); |
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if (really_reset) { |
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/* reset the card */ |
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arcnet_inb(ioaddr, COM9026_REG_R_RESET); |
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mdelay(RESETtime); |
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} |
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/* Set the thing to IO-mapped, 8-bit mode */ |
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lp->config = (0x1C | IOMAPflag) & ~ENABLE16flag; |
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arcnet_outb(lp->config, ioaddr, COM9026_REG_RW_CONFIG); |
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arcnet_outb(CFLAGScmd | RESETclear, ioaddr, COM9026_REG_W_COMMAND); |
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/* clear flags & end reset */ |
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arcnet_outb(CFLAGScmd | CONFIGclear, ioaddr, COM9026_REG_W_COMMAND); |
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/* verify that the ARCnet signature byte is present */ |
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if (get_buffer_byte(dev, 0) != TESTvalue) { |
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arc_printk(D_NORMAL, dev, "reset failed: TESTvalue not present.\n"); |
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return 1; |
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} |
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/* enable extended (512-byte) packets */ |
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arcnet_outb(CONFIGcmd | EXTconf, ioaddr, COM9026_REG_W_COMMAND); |
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/* done! return success. */ |
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return 0; |
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} |
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static void com90io_command(struct net_device *dev, int cmd) |
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{ |
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short ioaddr = dev->base_addr; |
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arcnet_outb(cmd, ioaddr, COM9026_REG_W_COMMAND); |
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} |
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static int com90io_status(struct net_device *dev) |
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{ |
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short ioaddr = dev->base_addr; |
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return arcnet_inb(ioaddr, COM9026_REG_R_STATUS); |
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} |
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static void com90io_setmask(struct net_device *dev, int mask) |
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{ |
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short ioaddr = dev->base_addr; |
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arcnet_outb(mask, ioaddr, COM9026_REG_W_INTMASK); |
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} |
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static void com90io_copy_to_card(struct net_device *dev, int bufnum, |
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int offset, void *buf, int count) |
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{ |
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TIME(dev, "put_whole_buffer", count, |
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put_whole_buffer(dev, bufnum * 512 + offset, count, buf)); |
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} |
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static void com90io_copy_from_card(struct net_device *dev, int bufnum, |
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int offset, void *buf, int count) |
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{ |
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TIME(dev, "get_whole_buffer", count, |
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get_whole_buffer(dev, bufnum * 512 + offset, count, buf)); |
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} |
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static int io; /* use the insmod io= irq= shmem= options */ |
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static int irq; |
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static char device[9]; /* use eg. device=arc1 to change name */ |
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module_param_hw(io, int, ioport, 0); |
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module_param_hw(irq, int, irq, 0); |
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module_param_string(device, device, sizeof(device), 0); |
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MODULE_LICENSE("GPL"); |
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#ifndef MODULE |
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static int __init com90io_setup(char *s) |
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{ |
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int ints[4]; |
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s = get_options(s, 4, ints); |
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if (!ints[0]) |
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return 0; |
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switch (ints[0]) { |
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default: /* ERROR */ |
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pr_err("Too many arguments\n"); |
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fallthrough; |
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case 2: /* IRQ */ |
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irq = ints[2]; |
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fallthrough; |
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case 1: /* IO address */ |
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io = ints[1]; |
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} |
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if (*s) |
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snprintf(device, sizeof(device), "%s", s); |
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return 1; |
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} |
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__setup("com90io=", com90io_setup); |
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#endif |
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static struct net_device *my_dev; |
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static int __init com90io_init(void) |
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{ |
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struct net_device *dev; |
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int err; |
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dev = alloc_arcdev(device); |
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if (!dev) |
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return -ENOMEM; |
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dev->base_addr = io; |
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dev->irq = irq; |
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if (dev->irq == 2) |
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dev->irq = 9; |
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err = com90io_probe(dev); |
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if (err) { |
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free_arcdev(dev); |
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return err; |
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} |
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my_dev = dev; |
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return 0; |
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} |
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static void __exit com90io_exit(void) |
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{ |
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struct net_device *dev = my_dev; |
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int ioaddr = dev->base_addr; |
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unregister_netdev(dev); |
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/* In case the old driver is loaded later, |
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* set the thing back to MMAP mode |
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*/ |
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arcnet_outb(arcnet_inb(ioaddr, COM9026_REG_RW_CONFIG) & ~IOMAPflag, |
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ioaddr, COM9026_REG_RW_CONFIG); |
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free_irq(dev->irq, dev); |
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release_region(dev->base_addr, ARCNET_TOTAL_SIZE); |
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free_arcdev(dev); |
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} |
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module_init(com90io_init) |
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module_exit(com90io_exit)
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