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112 lines
2.6 KiB
112 lines
2.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* starfire.c: Starfire/E10000 support. |
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* |
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* Copyright (C) 1998 David S. Miller ([email protected]) |
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* Copyright (C) 2000 Anton Blanchard ([email protected]) |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <asm/page.h> |
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#include <asm/oplib.h> |
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#include <asm/smp.h> |
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#include <asm/upa.h> |
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#include <asm/starfire.h> |
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/* |
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* A few places around the kernel check this to see if |
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* they need to call us to do things in a Starfire specific |
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* way. |
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*/ |
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int this_is_starfire = 0; |
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void check_if_starfire(void) |
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{ |
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phandle ssnode = prom_finddevice("/ssp-serial"); |
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if (ssnode != 0 && (s32)ssnode != -1) |
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this_is_starfire = 1; |
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} |
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/* |
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* Each Starfire board has 32 registers which perform translation |
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* and delivery of traditional interrupt packets into the extended |
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* Starfire hardware format. Essentially UPAID's now have 2 more |
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* bits than in all previous Sun5 systems. |
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*/ |
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struct starfire_irqinfo { |
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unsigned long imap_slots[32]; |
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unsigned long tregs[32]; |
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struct starfire_irqinfo *next; |
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int upaid, hwmid; |
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}; |
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static struct starfire_irqinfo *sflist = NULL; |
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/* Beam me up Scott(McNeil)y... */ |
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void starfire_hookup(int upaid) |
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{ |
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struct starfire_irqinfo *p; |
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unsigned long treg_base, hwmid, i; |
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p = kmalloc(sizeof(*p), GFP_KERNEL); |
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if (!p) { |
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prom_printf("starfire_hookup: No memory, this is insane.\n"); |
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prom_halt(); |
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} |
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treg_base = 0x100fc000000UL; |
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hwmid = ((upaid & 0x3c) << 1) | |
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((upaid & 0x40) >> 4) | |
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(upaid & 0x3); |
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p->hwmid = hwmid; |
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treg_base += (hwmid << 33UL); |
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treg_base += 0x200UL; |
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for (i = 0; i < 32; i++) { |
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p->imap_slots[i] = 0UL; |
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p->tregs[i] = treg_base + (i * 0x10UL); |
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/* Lets play it safe and not overwrite existing mappings */ |
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if (upa_readl(p->tregs[i]) != 0) |
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p->imap_slots[i] = 0xdeadbeaf; |
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} |
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p->upaid = upaid; |
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p->next = sflist; |
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sflist = p; |
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} |
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unsigned int starfire_translate(unsigned long imap, |
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unsigned int upaid) |
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{ |
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struct starfire_irqinfo *p; |
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unsigned int bus_hwmid; |
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unsigned int i; |
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bus_hwmid = (((unsigned long)imap) >> 33) & 0x7f; |
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for (p = sflist; p != NULL; p = p->next) |
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if (p->hwmid == bus_hwmid) |
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break; |
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if (p == NULL) { |
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prom_printf("XFIRE: Cannot find irqinfo for imap %016lx\n", |
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((unsigned long)imap)); |
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prom_halt(); |
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} |
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for (i = 0; i < 32; i++) { |
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if (p->imap_slots[i] == imap || |
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p->imap_slots[i] == 0UL) |
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break; |
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} |
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if (i == 32) { |
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printk("starfire_translate: Are you kidding me?\n"); |
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panic("Lucy in the sky...."); |
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} |
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p->imap_slots[i] = imap; |
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/* map to real upaid */ |
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upaid = (((upaid & 0x3c) << 1) | |
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((upaid & 0x40) >> 4) | |
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(upaid & 0x3)); |
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upa_writel(upaid, p->tregs[i]); |
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return i; |
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}
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