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/ioport.h> 20 21 #include <asm/io.h> 22 #include <asm/hardware.h> 23 #include <asm/parisc-device.h> 24 25 struct hppb_card { 26 unsigned long hpa; 27 struct resource mmio_region; 28 struct hppb_card *next; 29 }; 30 31 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 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 printk(KERN_INFO "Found GeckoBoa at 0x%x\n", dev->hpa.start); 65 66 card->hpa = dev->hpa.start; 67 card->mmio_region.name = "HP-PB Bus"; 68 card->mmio_region.flags = IORESOURCE_MEM; 69 70 card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW); 71 card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1; 72 73 status = ccio_request_resource(dev, &card->mmio_region); 74 if(status < 0) { 75 printk(KERN_ERR "%s: failed to claim HP-PB bus space (%08x, %08x)\n", 76 __FILE__, card->mmio_region.start, card->mmio_region.end); 77 } 78 79 return 0; 80 } 81 82 static struct parisc_device_id hppb_tbl[] = { 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 = { 91 .name = "gecko_boa", 92 .id_table = hppb_tbl, 93 .probe = hppb_probe, 94 }; 95 96 /** 97 * hppb_init - HP-PB bus initalization procedure. 98 * 99 * Register this driver. 100 */ 101 void __init hppb_init(void) 102 { 103 register_parisc_driver(&hppb_driver); 104 } 105