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%llx\n",
  66                         (unsigned long long) dev->hpa.start);
  67
  68         card->hpa = dev->hpa.start;
  69         card->mmio_region.name = "HP-PB Bus";
  70         card->mmio_region.flags = IORESOURCE_MEM;
  71
  72         card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW);
  73         card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1;
  74
  75         status = ccio_request_resource(dev, &card->mmio_region);
  76         if(status < 0) {
  77                 printk(KERN_ERR "%s: failed to claim HP-PB bus space (%pR)\n",
  78                         __FILE__, &card->mmio_region);
  79         }
  80
  81         return 0;
  82 }
  83
  84 static struct parisc_device_id hppb_tbl[] = {
  85         { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, /* E25 and K */
  86         { HPHW_BCPORT, 0x0, 0x501, 0xc }, /* E35 */
  87         { HPHW_BCPORT, 0x0, 0x502, 0xc }, /* E45 */
  88         { HPHW_BCPORT, 0x0, 0x503, 0xc }, /* E55 */
  89         { 0, }
  90 };
  91
  92 static struct parisc_driver hppb_driver = {
  93         .name =         "gecko_boa",
  94         .id_table =     hppb_tbl,
  95         .probe =        hppb_probe,
  96 };
  97
  98 /**
  99  * hppb_init - HP-PB bus initialization procedure.
 100  *
 101  * Register this driver.
 102  */
 103 void __init hppb_init(void)
 104 {
 105         register_parisc_driver(&hppb_driver);
 106 }