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 */
  14
  15 #include <linux/types.h>
  16 #include <linux/init.h>
  17 #include <linux/mm.h>
  18 #include <linux/slab.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/ioport.h>
  21
  22 #include <asm/io.h>
  23 #include <asm/hardware.h>
  24 #include <asm/parisc-device.h>
  25
  26 #include "iommu.h"
  27
  28 struct hppb_card {
  29         unsigned long hpa;
  30         struct resource mmio_region;
  31         struct hppb_card *next;
  32 };
  33
  34 static struct hppb_card hppb_card_head = {
  35         .hpa = 0,
  36         .next = NULL,
  37 };
  38
  39 #define IO_IO_LOW  offsetof(struct bc_module, io_io_low)
  40 #define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
  41
  42 /**
  43  * hppb_probe - Determine if the hppb driver should claim this device.
  44  * @dev: The device which has been found
  45  *
  46  * Determine if hppb driver should claim this chip (return 0) or not
  47  * (return 1). If so, initialize the chip and tell other partners in crime
  48  * they have work to do.
  49  */
  50 static int __init hppb_probe(struct parisc_device *dev)
  51 {
  52         int status;
  53         struct hppb_card *card = &hppb_card_head;
  54
  55         while(card->next) {
  56                 card = card->next;
  57         }
  58
  59         if(card->hpa) {
  60                 card->next = kzalloc(sizeof(struct hppb_card), GFP_KERNEL);
  61                 if(!card->next) {
  62                         printk(KERN_ERR "HP-PB: Unable to allocate memory.\n");
  63                         return 1;
  64                 }
  65                 card = card->next;
  66         }
  67         printk(KERN_INFO "Found GeckoBoa at 0x%llx\n",
  68                         (unsigned long long) dev->hpa.start);
  69
  70         card->hpa = dev->hpa.start;
  71         card->mmio_region.name = "HP-PB Bus";
  72         card->mmio_region.flags = IORESOURCE_MEM;
  73
  74         card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW);
  75         card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1;
  76
  77         status = ccio_request_resource(dev, &card->mmio_region);
  78         if(status < 0) {
  79                 printk(KERN_ERR "%s: failed to claim HP-PB bus space (%pR)\n",
  80                         __FILE__, &card->mmio_region);
  81         }
  82
  83         return 0;
  84 }
  85
  86 static const struct parisc_device_id hppb_tbl[] __initconst = {
  87         { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, /* E25 and K */
  88         { HPHW_BCPORT, 0x0, 0x501, 0xc }, /* E35 */
  89         { HPHW_BCPORT, 0x0, 0x502, 0xc }, /* E45 */
  90         { HPHW_BCPORT, 0x0, 0x503, 0xc }, /* E55 */
  91         { 0, }
  92 };
  93
  94 static struct parisc_driver hppb_driver __refdata = {
  95         .name =         "gecko_boa",
  96         .id_table =     hppb_tbl,
  97         .probe =        hppb_probe,
  98 };
  99
 100 /**
 101  * hppb_init - HP-PB bus initialization procedure.
 102  *
 103  * Register this driver.
 104  */
 105 void __init hppb_init(void)
 106 {
 107         register_parisc_driver(&hppb_driver);
 108 }