| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 | } |