drivers/parisc/hppb.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3 ** hppb.c:
   4 **      HP-PB bus driver for the NOVA and K-Class systems.
   5 **
   6 **      (c) Copyright 2002 Ryan Bradetich
   7 **      (c) Copyright 2002 Hewlett-Packard Company
   8 **
   9 **
  10 */
  11
  12 #include <linux/types.h>
  13 #include <linux/init.h>
  14 #include <linux/mm.h>
  15 #include <linux/slab.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/ioport.h>
  18
  19 #include <asm/io.h>
  20 #include <asm/hardware.h>
  21 #include <asm/parisc-device.h>
  22
  23 #include "iommu.h"
  24
  25 struct hppb_card {
  26         unsigned long hpa;
  27         struct resource mmio_region;
  28         struct hppb_card *next;
  29 };
  30
  31 static struct hppb_card hppb_card_head = {
  32         .hpa = 0,
  33         .next = NULL,
  34 };
  35
  36 #define IO_IO_LOW  offsetof(struct bc_module, io_io_low)
  37 #define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
  38
  39 /**
  40  * hppb_probe - Determine if the hppb driver should claim this device.
  41  * @dev: The device which has been found
  42  *
  43  * Determine if hppb driver should claim this chip (return 0) or not
  44  * (return 1). If so, initialize the chip and tell other partners in crime
  45  * they have work to do.
  46  */
  47 static int __init hppb_probe(struct parisc_device *dev)
  48 {
  49         int status;
  50         struct hppb_card *card = &hppb_card_head;
  51
  52         while(card->next) {
  53                 card = card->next;
  54         }
  55
  56         if(card->hpa) {
  57                 card->next = kzalloc(sizeof(struct hppb_card), GFP_KERNEL);
  58                 if(!card->next) {
  59                         printk(KERN_ERR "HP-PB: Unable to allocate memory.\n");
  60                         return 1;
  61                 }
  62                 card = card->next;
  63         }
  64
  65         card->hpa = dev->hpa.start;
  66         card->mmio_region.name = "HP-PB Bus";
  67         card->mmio_region.flags = IORESOURCE_MEM;
  68
  69         card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW);
  70         card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1;
  71
  72         status = ccio_request_resource(dev, &card->mmio_region);
  73
  74         pr_info("Found GeckoBoa at %pap, bus space %pR,%s claimed.\n",
  75                         &dev->hpa.start,
  76                         &card->mmio_region,
  77                         (status < 0) ? " not":"" );
  78
  79         return 0;
  80 }
  81
  82 static const struct parisc_device_id hppb_tbl[] __initconst = {
  83         { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, /* E25 and K */
  84         { HPHW_BCPORT, 0x0, 0x501, 0xc }, /* E35 */
  85         { HPHW_BCPORT, 0x0, 0x502, 0xc }, /* E45 */
  86         { HPHW_BCPORT, 0x0, 0x503, 0xc }, /* E55 */
  87         { 0, }
  88 };
  89
  90 static struct parisc_driver hppb_driver __refdata = {
  91         .name =         "gecko_boa",
  92         .id_table =     hppb_tbl,
  93         .probe =        hppb_probe,
  94 };
  95
  96 /**
  97  * hppb_init - HP-PB bus initialization procedure.
  98  *
  99  * Register this driver.
 100  */
 101 void __init hppb_init(void)
 102 {
 103         register_parisc_driver(&hppb_driver);
 104 }