drivers/parisc/hppb.c

   1 /*
   2 ** hppb.c:
   3 **      HP-PB bus driver for the NOVA and K-Class systems.
   4 **
   5 **      (c) Copyright 2002 Ryan Bradetich
   6 **      (c) Copyright 2002 Hewlett-Packard Company
   7 **
   8 ** This program is free software; you can redistribute it and/or modify
   9 ** it under the terms of the GNU General Public License as published by
  10 ** the Free Software Foundation; either version 2 of the License, or
  11 ** (at your option) any later version.
  12 **
  13 ** This Driver currently only supports the console (port 0) on the MUX.
  14 ** Additional work will be needed on this driver to enable the full
  15 ** functionality of the MUX.
  16 **
  17 */
  18
  19 #include <linux/types.h>
  20 #include <linux/init.h>
  21 #include <linux/mm.h>
  22 #include <linux/slab.h>
  23 #include <linux/ioport.h>
  24
  25 #include <asm/io.h>
  26 #include <asm/hardware.h>
  27 #include <asm/parisc-device.h>
  28
  29 #include <linux/pci.h>
  30
  31 struct hppb_card {
  32         unsigned long hpa;
  33         struct resource mmio_region;
  34         struct hppb_card *next;
  35 };
  36
  37 struct hppb_card hppb_card_head = {
  38         .hpa = 0,
  39         .next = NULL,
  40 };
  41
  42 #define IO_IO_LOW  offsetof(struct bc_module, io_io_low)
  43 #define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
  44
  45 /**
  46  * hppb_probe - Determine if the hppb driver should claim this device.
  47  * @dev: The device which has been found
  48  *
  49  * Determine if hppb driver should claim this chip (return 0) or not
  50  * (return 1). If so, initialize the chip and tell other partners in crime
  51  * they have work to do.
  52  */
  53 static int hppb_probe(struct parisc_device *dev)
  54 {
  55         int status;
  56         struct hppb_card *card = &hppb_card_head;
  57
  58         while(card->next) {
  59                 card = card->next;
  60         }
  61
  62         if(card->hpa) {
  63                 card->next = kmalloc(sizeof(struct hppb_card), GFP_KERNEL);
  64                 if(!card->next) {
  65                         printk(KERN_ERR "HP-PB: Unable to allocate memory.\n");
  66                         return 1;
  67                 }
  68                 memset(card->next, '\0', sizeof(struct hppb_card));
  69                 card = card->next;
  70         }
  71         printk(KERN_INFO "Found GeckoBoa at 0x%lx\n", dev->hpa.start);
  72
  73         card->hpa = dev->hpa.start;
  74         card->mmio_region.name = "HP-PB Bus";
  75         card->mmio_region.flags = IORESOURCE_MEM;
  76
  77         card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW);
  78         card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1;
  79
  80         status = ccio_request_resource(dev, &card->mmio_region);
  81         if(status < 0) {
  82                 printk(KERN_ERR "%s: failed to claim HP-PB bus space (%08lx, %08lx)\n",
  83                         __FILE__, card->mmio_region.start, card->mmio_region.end);
  84         }
  85
  86         return 0;
  87 }
  88
  89
  90 static struct parisc_device_id hppb_tbl[] = {
  91         { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc },
  92         { 0, }
  93 };
  94
  95 static struct parisc_driver hppb_driver = {
  96         .name =         "gecko_boa",
  97         .id_table =     hppb_tbl,
  98         .probe =        hppb_probe,
  99 };
 100
 101 /**
 102  * hppb_init - HP-PB bus initalization procedure.
 103  *
 104  * Register this driver.
 105  */
 106 void __init hppb_init(void)
 107 {
 108         register_parisc_driver(&hppb_driver);
 109 }