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 struct hppb_card {
  27         unsigned long hpa;
  28         struct resource mmio_region;
  29         struct hppb_card *next;
  30 };
  31
  32 static struct hppb_card hppb_card_head = {
  33         .hpa = 0,
  34         .next = NULL,
  35 };
  36
  37 #define IO_IO_LOW  offsetof(struct bc_module, io_io_low)
  38 #define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
  39
  40 /**
  41  * hppb_probe - Determine if the hppb driver should claim this device.
  42  * @dev: The device which has been found
  43  *
  44  * Determine if hppb driver should claim this chip (return 0) or not
  45  * (return 1). If so, initialize the chip and tell other partners in crime
  46  * they have work to do.
  47  */
  48 static int hppb_probe(struct parisc_device *dev)
  49 {
  50         int status;
  51         struct hppb_card *card = &hppb_card_head;
  52
  53         while(card->next) {
  54                 card = card->next;
  55         }
  56
  57         if(card->hpa) {
  58                 card->next = kzalloc(sizeof(struct hppb_card), GFP_KERNEL);
  59                 if(!card->next) {
  60                         printk(KERN_ERR "HP-PB: Unable to allocate memory.\n");
  61                         return 1;
  62                 }
  63                 card = card->next;
  64         }
  65         printk(KERN_INFO "Found GeckoBoa at 0x%x\n", dev->hpa.start);
  66
  67         card->hpa = dev->hpa.start;
  68         card->mmio_region.name = "HP-PB Bus";
  69         card->mmio_region.flags = IORESOURCE_MEM;
  70
  71         card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW);
  72         card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1;
  73
  74         status = ccio_request_resource(dev, &card->mmio_region);
  75         if(status < 0) {
  76                 printk(KERN_ERR "%s: failed to claim HP-PB bus space (%08x, %08x)\n",
  77                         __FILE__, card->mmio_region.start, card->mmio_region.end);
  78         }
  79
  80         return 0;
  81 }
  82
  83 static struct parisc_device_id hppb_tbl[] = {
  84         { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, /* E25 and K */
  85         { HPHW_BCPORT, 0x0, 0x501, 0xc }, /* E35 */
  86         { HPHW_BCPORT, 0x0, 0x502, 0xc }, /* E45 */
  87         { HPHW_BCPORT, 0x0, 0x503, 0xc }, /* E55 */
  88         { 0, }
  89 };
  90
  91 static struct parisc_driver hppb_driver = {
  92         .name =         "gecko_boa",
  93         .id_table =     hppb_tbl,
  94         .probe =        hppb_probe,
  95 };
  96
  97 /**
  98  * hppb_init - HP-PB bus initialization procedure.
  99  *
 100  * Register this driver.
 101  */
 102 void __init hppb_init(void)
 103 {
 104         register_parisc_driver(&hppb_driver);
 105 }