1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 ** hppb.c: 4 ** HP-PB bus driver for the NOVA and K-Class systems. 5 ** 6 ** (c) Copyright 2002 Ryan Bradetich 7 ** (c) Copyright 2002 Hewlett-Packard Company 8 ** 9 ** 10 */ 11 12 #include <linux/types.h> 13 #include <linux/init.h> 14 #include <linux/mm.h> 15 #include <linux/slab.h> 16 #include <linux/dma-mapping.h> 17 #include <linux/ioport.h> 18 19 #include <asm/io.h> 20 #include <asm/hardware.h> 21 #include <asm/parisc-device.h> 22 23 #include "iommu.h" 24 25 struct hppb_card { 26 unsigned long hpa; 27 struct resource mmio_region; 28 struct hppb_card *next; 29 }; 30 31 static 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 __init 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%llx\n", 65 (unsigned long long) dev->hpa.start); 66 67 card->hpa = dev->hpa.start; 68 card->mmio_region.name = "HP-PB Bus"; 69 card->mmio_region.flags = IORESOURCE_MEM; 70 71 card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW); 72 card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1; 73 74 status = ccio_request_resource(dev, &card->mmio_region); 75 if(status < 0) { 76 printk(KERN_ERR "%s: failed to claim HP-PB bus space (%pR)\n", 77 __FILE__, &card->mmio_region); 78 } 79 80 return 0; 81 } 82 83 static const struct parisc_device_id hppb_tbl[] __initconst = { 84 { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, /* E25 and K */ 85 { HPHW_BCPORT, 0x0, 0x501, 0xc }, /* E35 */ 86 { HPHW_BCPORT, 0x0, 0x502, 0xc }, /* E45 */ 87 { HPHW_BCPORT, 0x0, 0x503, 0xc }, /* E55 */ 88 { 0, } 89 }; 90 91 static struct parisc_driver hppb_driver __refdata = { 92 .name = "gecko_boa", 93 .id_table = hppb_tbl, 94 .probe = hppb_probe, 95 }; 96 97 /** 98 * hppb_init - HP-PB bus initialization procedure. 99 * 100 * Register this driver. 101 */ 102 void __init hppb_init(void) 103 { 104 register_parisc_driver(&hppb_driver); 105 } 106