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