LXR linux/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
  25struct hppb_card {
  26        unsigned long hpa;
  27        struct resource mmio_region;
  28        struct hppb_card *next;
  29};
  30
  31static 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 */
  47static 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
  82static 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
  90static 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 */
 101void __init hppb_init(void)
 102{
 103        register_parisc_driver(&hppb_driver);
 104}
 105