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 #include "iommu.h" 27 28 struct hppb_card { 29 unsigned long hpa; 30 struct resource mmio_region; 31 struct hppb_card *next; 32 }; 33 34 static struct hppb_card hppb_card_head = { 35 .hpa = 0, 36 .next = NULL, 37 }; 38 39 #define IO_IO_LOW offsetof(struct bc_module, io_io_low) 40 #define IO_IO_HIGH offsetof(struct bc_module, io_io_high) 41 42 /** 43 * hppb_probe - Determine if the hppb driver should claim this device. 44 * @dev: The device which has been found 45 * 46 * Determine if hppb driver should claim this chip (return 0) or not 47 * (return 1). If so, initialize the chip and tell other partners in crime 48 * they have work to do. 49 */ 50 static int __init hppb_probe(struct parisc_device *dev) 51 { 52 int status; 53 struct hppb_card *card = &hppb_card_head; 54 55 while(card->next) { 56 card = card->next; 57 } 58 59 if(card->hpa) { 60 card->next = kzalloc(sizeof(struct hppb_card), GFP_KERNEL); 61 if(!card->next) { 62 printk(KERN_ERR "HP-PB: Unable to allocate memory.\n"); 63 return 1; 64 } 65 card = card->next; 66 } 67 printk(KERN_INFO "Found GeckoBoa at 0x%llx\n", 68 (unsigned long long) dev->hpa.start); 69 70 card->hpa = dev->hpa.start; 71 card->mmio_region.name = "HP-PB Bus"; 72 card->mmio_region.flags = IORESOURCE_MEM; 73 74 card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW); 75 card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1; 76 77 status = ccio_request_resource(dev, &card->mmio_region); 78 if(status < 0) { 79 printk(KERN_ERR "%s: failed to claim HP-PB bus space (%pR)\n", 80 __FILE__, &card->mmio_region); 81 } 82 83 return 0; 84 } 85 86 static const struct parisc_device_id hppb_tbl[] __initconst = { 87 { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, /* E25 and K */ 88 { HPHW_BCPORT, 0x0, 0x501, 0xc }, /* E35 */ 89 { HPHW_BCPORT, 0x0, 0x502, 0xc }, /* E45 */ 90 { HPHW_BCPORT, 0x0, 0x503, 0xc }, /* E55 */ 91 { 0, } 92 }; 93 94 static struct parisc_driver hppb_driver __refdata = { 95 .name = "gecko_boa", 96 .id_table = hppb_tbl, 97 .probe = hppb_probe, 98 }; 99 100 /** 101 * hppb_init - HP-PB bus initialization procedure. 102 * 103 * Register this driver. 104 */ 105 void __init hppb_init(void) 106 { 107 register_parisc_driver(&hppb_driver); 108 } 109