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 ** This Driver currently only supports the console (port 0) on the MUX. 14 ** Additional work will be needed on this driver to enable the full 15 ** functionality of the MUX. 16 ** 17 */ 18 19 #include <linux/types.h> 20 #include <linux/init.h> 21 #include <linux/mm.h> 22 #include <linux/slab.h> 23 #include <linux/ioport.h> 24 25 #include <asm/io.h> 26 #include <asm/hardware.h> 27 #include <asm/parisc-device.h> 28 29 #include <linux/pci.h> 30 31 struct hppb_card { 32 unsigned long hpa; 33 struct resource mmio_region; 34 struct hppb_card *next; 35 }; 36 37 struct hppb_card hppb_card_head = { 38 .hpa = 0, 39 .next = NULL, 40 }; 41 42 #define IO_IO_LOW offsetof(struct bc_module, io_io_low) 43 #define IO_IO_HIGH offsetof(struct bc_module, io_io_high) 44 45 /** 46 * hppb_probe - Determine if the hppb driver should claim this device. 47 * @dev: The device which has been found 48 * 49 * Determine if hppb driver should claim this chip (return 0) or not 50 * (return 1). If so, initialize the chip and tell other partners in crime 51 * they have work to do. 52 */ 53 static int hppb_probe(struct parisc_device *dev) 54 { 55 int status; 56 struct hppb_card *card = &hppb_card_head; 57 58 while(card->next) { 59 card = card->next; 60 } 61 62 if(card->hpa) { 63 card->next = kmalloc(sizeof(struct hppb_card), GFP_KERNEL); 64 if(!card->next) { 65 printk(KERN_ERR "HP-PB: Unable to allocate memory.\n"); 66 return 1; 67 } 68 memset(card->next, '\0', sizeof(struct hppb_card)); 69 card = card->next; 70 } 71 printk(KERN_INFO "Found GeckoBoa at 0x%lx\n", dev->hpa.start); 72 73 card->hpa = dev->hpa.start; 74 card->mmio_region.name = "HP-PB Bus"; 75 card->mmio_region.flags = IORESOURCE_MEM; 76 77 card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW); 78 card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1; 79 80 status = ccio_request_resource(dev, &card->mmio_region); 81 if(status < 0) { 82 printk(KERN_ERR "%s: failed to claim HP-PB bus space (%08lx, %08lx)\n", 83 __FILE__, card->mmio_region.start, card->mmio_region.end); 84 } 85 86 return 0; 87 } 88 89 90 static struct parisc_device_id hppb_tbl[] = { 91 { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, 92 { 0, } 93 }; 94 95 static struct parisc_driver hppb_driver = { 96 .name = "gecko_boa", 97 .id_table = hppb_tbl, 98 .probe = hppb_probe, 99 }; 100 101 /** 102 * hppb_init - HP-PB bus initalization procedure. 103 * 104 * Register this driver. 105 */ 106 void __init hppb_init(void) 107 { 108 register_parisc_driver(&hppb_driver); 109 } 110