text: // SPDX-License-Identifier: GPL-2.0-or-later
  /*
  ** hppb.c:
  **      HP-PB bus driver for the NOVA and K-Class systems.
  **
  **      (c) Copyright 2002 Ryan Bradetich
  **      (c) Copyright 2002 Hewlett-Packard Company
  **
  **
  */
  
  #include <linux/types.h>
  #include <linux/init.h>
  #include <linux/mm.h>
  #include <linux/slab.h>
  #include <linux/dma-mapping.h>
  #include <linux/ioport.h>
  
  #include <asm/io.h>
  #include <asm/hardware.h>
  #include <asm/parisc-device.h>
  
  #include "iommu.h"
  
  struct hppb_card {
  	unsigned long hpa;
  	struct resource mmio_region;
  	struct hppb_card *next;
  };
  
  static struct hppb_card hppb_card_head = {
  	.hpa = 0,
  	.next = NULL,
  };
  
  #define IO_IO_LOW  offsetof(struct bc_module, io_io_low)
  #define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
  
  /**
   * hppb_probe - Determine if the hppb driver should claim this device.
   * @dev: The device which has been found
   *
   * Determine if hppb driver should claim this chip (return 0) or not 
   * (return 1). If so, initialize the chip and tell other partners in crime 
   * they have work to do.
   */
  static int __init hppb_probe(struct parisc_device *dev)
  {
  	int status;
  	struct hppb_card *card = &hppb_card_head;
  
  	while(card->next) {
  		card = card->next;
  	}
  
  	if(card->hpa) {
  		card->next = kzalloc(sizeof(struct hppb_card), GFP_KERNEL);
  		if(!card->next) {
  			printk(KERN_ERR "HP-PB: Unable to allocate memory.\n");
  			return 1;
  		}
  		card = card->next;
  	}
  	printk(KERN_INFO "Found GeckoBoa at 0x%llx\n",
  			(unsigned long long) dev->hpa.start);
  
  	card->hpa = dev->hpa.start;
  	card->mmio_region.name = "HP-PB Bus";
  	card->mmio_region.flags = IORESOURCE_MEM;
  
  	card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW);
  	card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1;
  
  	status = ccio_request_resource(dev, &card->mmio_region);
  	if(status < 0) {
  		printk(KERN_ERR "%s: failed to claim HP-PB bus space (%pR)\n",
  			__FILE__, &card->mmio_region);
  	}
  
          return 0;
  }
  
  static const struct parisc_device_id hppb_tbl[] __initconst = {
          { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, /* E25 and K */
          { HPHW_BCPORT, 0x0, 0x501, 0xc }, /* E35 */
          { HPHW_BCPORT, 0x0, 0x502, 0xc }, /* E45 */
          { HPHW_BCPORT, 0x0, 0x503, 0xc }, /* E55 */
          { 0, }
  };
  
  static struct parisc_driver hppb_driver __refdata = {
          .name =         "gecko_boa",
          .id_table =     hppb_tbl,
  	.probe =        hppb_probe,
  };
  
  /**
   * hppb_init - HP-PB bus initialization procedure.
   *
   * Register this driver.   
   */
  void __init hppb_init(void)
  {
          register_parisc_driver(&hppb_driver);
  }
  