1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * starfire.c: Starfire/E10000 support. 4 * 5 * Copyright (C) 1998 David S. Miller (davem@redhat.com) 6 * Copyright (C) 2000 Anton Blanchard (anton@samba.org) 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/slab.h> 11 12 #include <asm/page.h> 13 #include <asm/oplib.h> 14 #include <asm/smp.h> 15 #include <asm/upa.h> 16 #include <asm/starfire.h> 17 18 /* 19 * A few places around the kernel check this to see if 20 * they need to call us to do things in a Starfire specific 21 * way. 22 */ 23 int this_is_starfire = 0; 24 25 void check_if_starfire(void) 26 { 27 phandle ssnode = prom_finddevice("/ssp-serial"); 28 if (ssnode != 0 && (s32)ssnode != -1) 29 this_is_starfire = 1; 30 } 31 32 /* 33 * Each Starfire board has 32 registers which perform translation 34 * and delivery of traditional interrupt packets into the extended 35 * Starfire hardware format. Essentially UPAID's now have 2 more 36 * bits than in all previous Sun5 systems. 37 */ 38 struct starfire_irqinfo { 39 unsigned long imap_slots[32]; 40 unsigned long tregs[32]; 41 struct starfire_irqinfo *next; 42 int upaid, hwmid; 43 }; 44 45 static struct starfire_irqinfo *sflist = NULL; 46 47 /* Beam me up Scott(McNeil)y... */ 48 void starfire_hookup(int upaid) 49 { 50 struct starfire_irqinfo *p; 51 unsigned long treg_base, hwmid, i; 52 53 p = kmalloc(sizeof(*p), GFP_KERNEL); 54 if (!p) { 55 prom_printf("starfire_hookup: No memory, this is insane.\n"); 56 prom_halt(); 57 } 58 treg_base = 0x100fc000000UL; 59 hwmid = ((upaid & 0x3c) << 1) | 60 ((upaid & 0x40) >> 4) | 61 (upaid & 0x3); 62 p->hwmid = hwmid; 63 treg_base += (hwmid << 33UL); 64 treg_base += 0x200UL; 65 for (i = 0; i < 32; i++) { 66 p->imap_slots[i] = 0UL; 67 p->tregs[i] = treg_base + (i * 0x10UL); 68 /* Lets play it safe and not overwrite existing mappings */ 69 if (upa_readl(p->tregs[i]) != 0) 70 p->imap_slots[i] = 0xdeadbeaf; 71 } 72 p->upaid = upaid; 73 p->next = sflist; 74 sflist = p; 75 } 76 77 unsigned int starfire_translate(unsigned long imap, 78 unsigned int upaid) 79 { 80 struct starfire_irqinfo *p; 81 unsigned int bus_hwmid; 82 unsigned int i; 83 84 bus_hwmid = (((unsigned long)imap) >> 33) & 0x7f; 85 for (p = sflist; p != NULL; p = p->next) 86 if (p->hwmid == bus_hwmid) 87 break; 88 if (p == NULL) { 89 prom_printf("XFIRE: Cannot find irqinfo for imap %016lx\n", 90 ((unsigned long)imap)); 91 prom_halt(); 92 } 93 for (i = 0; i < 32; i++) { 94 if (p->imap_slots[i] == imap || 95 p->imap_slots[i] == 0UL) 96 break; 97 } 98 if (i == 32) { 99 printk("starfire_translate: Are you kidding me?\n"); 100 panic("Lucy in the sky...."); 101 } 102 p->imap_slots[i] = imap; 103 104 /* map to real upaid */ 105 upaid = (((upaid & 0x3c) << 1) | 106 ((upaid & 0x40) >> 4) | 107 (upaid & 0x3)); 108 109 upa_writel(upaid, p->tregs[i]); 110 111 return i; 112 } 113