178 lines
4.5 KiB
C
178 lines
4.5 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001-2006 Silicon Graphics, Inc. All rights reserved.
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*/
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#include <linux/types.h>
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#include <asm/sn/sn_sal.h>
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#include <asm/sn/pcibr_provider.h>
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#include <asm/sn/pcibus_provider_defs.h>
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#include <asm/sn/pcidev.h>
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int pcibr_invalidate_ate; /* by default don't invalidate ATE on free */
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/*
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* mark_ate: Mark the ate as either free or inuse.
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*/
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static void mark_ate(struct ate_resource *ate_resource, int start, int number,
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u64 value)
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{
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u64 *ate = ate_resource->ate;
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int index;
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int length = 0;
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for (index = start; length < number; index++, length++)
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ate[index] = value;
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}
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/*
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* find_free_ate: Find the first free ate index starting from the given
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* index for the desired consecutive count.
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*/
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static int find_free_ate(struct ate_resource *ate_resource, int start,
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int count)
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{
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u64 *ate = ate_resource->ate;
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int index;
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int start_free;
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for (index = start; index < ate_resource->num_ate;) {
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if (!ate[index]) {
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int i;
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int free;
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free = 0;
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start_free = index; /* Found start free ate */
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for (i = start_free; i < ate_resource->num_ate; i++) {
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if (!ate[i]) { /* This is free */
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if (++free == count)
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return start_free;
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} else {
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index = i + 1;
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break;
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}
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}
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if (i >= ate_resource->num_ate)
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return -1;
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} else
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index++; /* Try next ate */
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}
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return -1;
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}
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/*
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* free_ate_resource: Free the requested number of ATEs.
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*/
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static inline void free_ate_resource(struct ate_resource *ate_resource,
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int start)
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{
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mark_ate(ate_resource, start, ate_resource->ate[start], 0);
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if ((ate_resource->lowest_free_index > start) ||
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(ate_resource->lowest_free_index < 0))
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ate_resource->lowest_free_index = start;
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}
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/*
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* alloc_ate_resource: Allocate the requested number of ATEs.
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*/
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static inline int alloc_ate_resource(struct ate_resource *ate_resource,
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int ate_needed)
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{
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int start_index;
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/*
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* Check for ate exhaustion.
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*/
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if (ate_resource->lowest_free_index < 0)
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return -1;
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/*
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* Find the required number of free consecutive ates.
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*/
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start_index =
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find_free_ate(ate_resource, ate_resource->lowest_free_index,
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ate_needed);
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if (start_index >= 0)
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mark_ate(ate_resource, start_index, ate_needed, ate_needed);
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ate_resource->lowest_free_index =
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find_free_ate(ate_resource, ate_resource->lowest_free_index, 1);
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return start_index;
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}
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/*
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* Allocate "count" contiguous Bridge Address Translation Entries
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* on the specified bridge to be used for PCI to XTALK mappings.
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* Indices in rm map range from 1..num_entries. Indices returned
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* to caller range from 0..num_entries-1.
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*
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* Return the start index on success, -1 on failure.
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*/
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int pcibr_ate_alloc(struct pcibus_info *pcibus_info, int count)
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{
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int status;
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unsigned long flags;
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spin_lock_irqsave(&pcibus_info->pbi_lock, flags);
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status = alloc_ate_resource(&pcibus_info->pbi_int_ate_resource, count);
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spin_unlock_irqrestore(&pcibus_info->pbi_lock, flags);
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return status;
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}
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/*
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* Setup an Address Translation Entry as specified. Use either the Bridge
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* internal maps or the external map RAM, as appropriate.
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*/
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static inline u64 __iomem *pcibr_ate_addr(struct pcibus_info *pcibus_info,
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int ate_index)
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{
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if (ate_index < pcibus_info->pbi_int_ate_size) {
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return pcireg_int_ate_addr(pcibus_info, ate_index);
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}
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panic("pcibr_ate_addr: invalid ate_index 0x%x", ate_index);
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}
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/*
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* Update the ate.
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*/
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inline void
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ate_write(struct pcibus_info *pcibus_info, int ate_index, int count,
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volatile u64 ate)
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{
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while (count-- > 0) {
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if (ate_index < pcibus_info->pbi_int_ate_size) {
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pcireg_int_ate_set(pcibus_info, ate_index, ate);
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} else {
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panic("ate_write: invalid ate_index 0x%x", ate_index);
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}
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ate_index++;
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ate += IOPGSIZE;
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}
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pcireg_tflush_get(pcibus_info); /* wait until Bridge PIO complete */
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}
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void pcibr_ate_free(struct pcibus_info *pcibus_info, int index)
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{
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volatile u64 ate;
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int count;
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unsigned long flags;
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if (pcibr_invalidate_ate) {
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/* For debugging purposes, clear the valid bit in the ATE */
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ate = *pcibr_ate_addr(pcibus_info, index);
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count = pcibus_info->pbi_int_ate_resource.ate[index];
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ate_write(pcibus_info, index, count, (ate & ~PCI32_ATE_V));
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}
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spin_lock_irqsave(&pcibus_info->pbi_lock, flags);
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free_ate_resource(&pcibus_info->pbi_int_ate_resource, index);
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spin_unlock_irqrestore(&pcibus_info->pbi_lock, flags);
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}
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