// 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.
  ");
  			return 1;
  		}

  		card = card->next;
  	}

  	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);

  
  	pr_info("Found GeckoBoa at %pap, bus space %pR,%s claimed.
  ",
  			&dev->hpa.start,
  			&card->mmio_region,
  			(status < 0) ? " not":"" );

  
          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);
  }