FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/pcicx.c

     /*-
      * TODO:
      * [1] integrate into current if_ed.c
      * [2] parse tuples to find out where to map the shared memory buffer,
      *     and what to write into the configuration register
      * [3] move pcic-specific code into a separate module.
      *
      * Device driver for IBM PCMCIA Credit Card Adapter for Ethernet,
      * if_ze.c
     *
     * Based on the Device driver for National Semiconductor DS8390 ethernet
     * adapters by David Greenman.  Modifications for PCMCIA by Keith Moore.
     * Adapted for FreeBSD 1.1.5 by Jordan Hubbard.
     *
     * Currently supports only the IBM Credit Card Adapter for Ethernet, but
     * could probably work with other PCMCIA cards also, if it were modified
     * to get the locations of the PCMCIA configuration option register (COR)
     * by parsing the configuration tuples, rather than by hard-coding in
     * the value expected by IBM's card.
     *
     * Sources for data on the PCMCIA/IBM CCAE specific portions of the driver:
     *
     * [1] _Local Area Network Credit Card Adapters Technical Reference_,
     *     IBM Corp., SC30-3585-00, part # 33G9243.
     * [2] "pre-alpha" PCMCIA support code for Linux by Barry Jaspan.
     * [3] Intel 82536SL PC Card Interface Controller Data Sheet, Intel
     *     Order Number 290423-002
     * [4] National Semiconductor DP83902A ST-NIC (tm) Serial Network
     *     Interface Controller for Twisted Pair data sheet.
     *
     *
     * Copyright (C) 1993, David Greenman. This software may be used, modified,
     *   copied, distributed, and sold, in both source and binary form provided
     *   that the above copyright and these terms are retained. Under no
     *   circumstances is the author responsible for the proper functioning
     *   of this software, nor does the author assume any responsibility
     *   for damages incurred with its use.
     */
    #include <sys/param.h>
    #if defined(__FreeBSD__)
    #include <sys/systm.h>
    #include <machine/clock.h>
    #endif
    #include <i386/isa/isa_device.h>
    #include <i386/isa/pcic.h>
    
    /*
     * map a portion of the card's memory space into system memory
     * space.
     *
     * slot = # of the slot the card is plugged into
     * window = which pcic memory map registers to use (0..4)
     * sys_addr = base system PHYSICAL memory address where we want it.  must
     *            be on an appropriate boundary (lower 12 bits are zero).
     * card_addr = the base address of the card's memory to correspond
     *             to sys_addr
     * length = length of the segment to map (may be rounded up as necessary)
     * type = which card memory space to map (attribute or shared)
     * width = 1 for byte-wide mapping; 2 for word (16-bit) mapping.
     */
    
    void
    pcic_map_memory (int slot, int window, unsigned long sys_addr,
                     unsigned long card_addr, unsigned long length,
                     enum memtype type, int width)
    {
        unsigned short offset;
        unsigned short mem_start_addr;
        unsigned short mem_stop_addr;
    
        sys_addr >>= 12;
        card_addr >>= 12;
        length >>= 12;
        /*
         * compute an offset for the chip such that
         * (sys_addr + offset) = card_addr
         * but the arithmetic is done modulo 2^14
         */
        offset = (card_addr - sys_addr) & 0x3FFF;
        /*
         * now OR in the bit for "attribute memory" if necessary
         */
        if (type == ATTRIBUTE) {
            offset |= (PCIC_REG << 8);
            /* REG == "region active" pin on card */
        }
        /*
         * okay, set up the chip memory mapping registers, and turn
         * on the enable bit for this window.
         * if we are doing 16-bit wide accesses (width == 2),
         * turn on the appropriate bit.
         *
         * XXX for now, we set all of the wait state bits to zero.
         * Not really sure how they should be set.
         */
        mem_start_addr = sys_addr & 0xFFF;
        if (width == 2)
            mem_start_addr |= (PCIC_DATA16 << 8);
        mem_stop_addr = (sys_addr + length) & 0xFFF;
   
       pcic_putw (slot, MEM_START_ADDR(window), mem_start_addr);
       pcic_putw (slot, MEM_STOP_ADDR(window), mem_stop_addr);
       pcic_putw (slot, MEM_OFFSET(window), offset);
       /*
        * Assert the bit (PCIC_MEMCS16) that says to decode all of
        * the address lines.
        */
       pcic_putb (slot, PCIC_ADDRWINE,
                  pcic_getb (slot, PCIC_ADDRWINE) |
                  MEM_ENABLE_BIT(window) | PCIC_MEMCS16);
   }
   
   void
   pcic_unmap_memory (int slot, int window)
   {
       /*
        * seems like we need to turn off the enable bit first, after which
        * we can clear the registers out just to be sure.
        */
       pcic_putb (slot, PCIC_ADDRWINE,
                  pcic_getb (slot, PCIC_ADDRWINE) & ~MEM_ENABLE_BIT(window));
       pcic_putw (slot, MEM_START_ADDR(window), 0);
       pcic_putw (slot, MEM_STOP_ADDR(window), 0);
       pcic_putw (slot, MEM_OFFSET(window), 0);
   }
   
   /*
    * map a range of addresses into system i/o space
    * (no translation of i/o addresses is possible)
    *
    * 'width' is:
    * + 0 to tell the PCIC to generate the ISA IOCS16* signal from
    *   the PCMCIA IOIS16* signal.
    * + 1 to select 8-bit width
    * + 2 to select 16-bit width
    */
   
   void
   pcic_map_io (int slot, int window, unsigned short base, unsigned short length,
                unsigned short width)
   {
       unsigned char x;
   
       pcic_putw (slot, IO_START_ADDR(window), base);
       pcic_putw (slot, IO_STOP_ADDR(window), base+length-1);
       /*
        * select the bits that determine whether
        * an i/o operation is 8 or 16 bits wide
        */
       x = pcic_getb (slot, PCIC_IOCTL);
       switch (width) {
       case 0:                     /* PCMCIA card decides */
           if (window)
               x = (x & 0xf0) | PCIC_IO1_CS16;
           else
               x = (x & 0x0f) | PCIC_IO0_CS16;
           break;
       case 1:                     /* 8 bits wide */
           break;
       case 2:                     /* 16 bits wide */
           if (window)
               x = (x & 0xf0) | PCIC_IO1_16BIT;
           else
               x = (x & 0x0f) | PCIC_IO0_16BIT;
           break;
       }
       pcic_putb (slot, PCIC_IOCTL, x);
       pcic_putb (slot, PCIC_ADDRWINE,
                  pcic_getb (slot, PCIC_ADDRWINE) | IO_ENABLE_BIT(window));
   }
   
   #ifdef TEST
   void
   pcic_unmap_io (int slot, int window)
   {
       pcic_putb (slot, PCIC_ADDRWINE,
                  pcic_getb (slot, PCIC_ADDRWINE) & ~IO_ENABLE_BIT(window));
       pcic_putw (slot, IO_START_ADDR(window), 0);
       pcic_putw (slot, IO_STOP_ADDR(window), 0);
   }
   #endif /* TEST */
   
   /*
    * tell the PCIC which irq we want to use.  only the following are legal:
    * 3, 4, 5, 7, 9, 10, 11, 12, 14, 15
    *
    * NB: 'irq' is an interrupt NUMBER, not a MASK as in struct isa_device.
    */
   
   void
   pcic_map_irq (int slot, int irq)
   {
       if (irq < 3 || irq == 6 || irq == 8 || irq == 13 || irq > 15) {
           printf ("zp: pcic_map_irq (slot %d): illegal irq %d\n", slot, irq);
           return;
       }
       pcic_putb (slot, PCIC_INT_GEN,
                  pcic_getb (slot, PCIC_INT_GEN) | (irq & 0x0F));
   }
   
   void
   pcic_power_on (int slot)
   {
       pcic_putb (slot, PCIC_STATUS,
                  pcic_getb (slot, PCIC_STATUS) | PCIC_POW);
       DELAY (100000);
       pcic_putb (slot, PCIC_POWER,
                  pcic_getb (slot, PCIC_POWER) | PCIC_DISRST | PCIC_PCPWRE);
       DELAY (100000);
       pcic_putb (slot, PCIC_POWER,
                  pcic_getb (slot, PCIC_POWER) | PCIC_OUTENA);
   }
   
   void
   pcic_power_off (int slot)
   {
       pcic_putb (slot, PCIC_POWER,
                  pcic_getb (slot, PCIC_POWER) & ~(PCIC_OUTENA|PCIC_PCPWRE));
   }
   
   void
   pcic_reset (int slot)
   {
       /* assert RESET (by clearing a bit!), wait a bit, and de-assert it */
       pcic_putb (slot, PCIC_INT_GEN,
                  pcic_getb (slot, PCIC_INT_GEN) & ~PCIC_CARDRESET);
       DELAY (100000);
       pcic_putb (slot, PCIC_INT_GEN,
                  pcic_getb (slot, PCIC_INT_GEN) | PCIC_CARDRESET);
   }
   

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