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Diffstat (limited to 'arch/ia64/sn/pci/pcibr/pcibr_ate.c')
-rw-r--r--arch/ia64/sn/pci/pcibr/pcibr_ate.c188
1 files changed, 188 insertions, 0 deletions
diff --git a/arch/ia64/sn/pci/pcibr/pcibr_ate.c b/arch/ia64/sn/pci/pcibr/pcibr_ate.c
new file mode 100644
index 000000000000..9d6854666f9b
--- /dev/null
+++ b/arch/ia64/sn/pci/pcibr/pcibr_ate.c
@@ -0,0 +1,188 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001-2004 Silicon Graphics, Inc. All rights reserved.
+ */
+
+#include <linux/types.h>
+#include <asm/sn/sn_sal.h>
+#include "pci/pcibus_provider_defs.h"
+#include "pci/pcidev.h"
+#include "pci/pcibr_provider.h"
+
+int pcibr_invalidate_ate = 0; /* by default don't invalidate ATE on free */
+
+/*
+ * mark_ate: Mark the ate as either free or inuse.
+ */
+static void mark_ate(struct ate_resource *ate_resource, int start, int number,
+ uint64_t value)
+{
+
+ uint64_t *ate = ate_resource->ate;
+ int index;
+ int length = 0;
+
+ for (index = start; length < number; index++, length++)
+ ate[index] = value;
+
+}
+
+/*
+ * find_free_ate: Find the first free ate index starting from the given
+ * index for the desired consequtive count.
+ */
+static int find_free_ate(struct ate_resource *ate_resource, int start,
+ int count)
+{
+
+ uint64_t *ate = ate_resource->ate;
+ int index;
+ int start_free;
+
+ for (index = start; index < ate_resource->num_ate;) {
+ if (!ate[index]) {
+ int i;
+ int free;
+ free = 0;
+ start_free = index; /* Found start free ate */
+ for (i = start_free; i < ate_resource->num_ate; i++) {
+ if (!ate[i]) { /* This is free */
+ if (++free == count)
+ return start_free;
+ } else {
+ index = i + 1;
+ break;
+ }
+ }
+ } else
+ index++; /* Try next ate */
+ }
+
+ return -1;
+}
+
+/*
+ * free_ate_resource: Free the requested number of ATEs.
+ */
+static inline void free_ate_resource(struct ate_resource *ate_resource,
+ int start)
+{
+
+ mark_ate(ate_resource, start, ate_resource->ate[start], 0);
+ if ((ate_resource->lowest_free_index > start) ||
+ (ate_resource->lowest_free_index < 0))
+ ate_resource->lowest_free_index = start;
+
+}
+
+/*
+ * alloc_ate_resource: Allocate the requested number of ATEs.
+ */
+static inline int alloc_ate_resource(struct ate_resource *ate_resource,
+ int ate_needed)
+{
+
+ int start_index;
+
+ /*
+ * Check for ate exhaustion.
+ */
+ if (ate_resource->lowest_free_index < 0)
+ return -1;
+
+ /*
+ * Find the required number of free consequtive ates.
+ */
+ start_index =
+ find_free_ate(ate_resource, ate_resource->lowest_free_index,
+ ate_needed);
+ if (start_index >= 0)
+ mark_ate(ate_resource, start_index, ate_needed, ate_needed);
+
+ ate_resource->lowest_free_index =
+ find_free_ate(ate_resource, ate_resource->lowest_free_index, 1);
+
+ return start_index;
+}
+
+/*
+ * Allocate "count" contiguous Bridge Address Translation Entries
+ * on the specified bridge to be used for PCI to XTALK mappings.
+ * Indices in rm map range from 1..num_entries. Indicies returned
+ * to caller range from 0..num_entries-1.
+ *
+ * Return the start index on success, -1 on failure.
+ */
+int pcibr_ate_alloc(struct pcibus_info *pcibus_info, int count)
+{
+ int status = 0;
+ uint64_t flag;
+
+ flag = pcibr_lock(pcibus_info);
+ status = alloc_ate_resource(&pcibus_info->pbi_int_ate_resource, count);
+
+ if (status < 0) {
+ /* Failed to allocate */
+ pcibr_unlock(pcibus_info, flag);
+ return -1;
+ }
+
+ pcibr_unlock(pcibus_info, flag);
+
+ return status;
+}
+
+/*
+ * Setup an Address Translation Entry as specified. Use either the Bridge
+ * internal maps or the external map RAM, as appropriate.
+ */
+static inline uint64_t *pcibr_ate_addr(struct pcibus_info *pcibus_info,
+ int ate_index)
+{
+ if (ate_index < pcibus_info->pbi_int_ate_size) {
+ return pcireg_int_ate_addr(pcibus_info, ate_index);
+ }
+ panic("pcibr_ate_addr: invalid ate_index 0x%x", ate_index);
+}
+
+/*
+ * Update the ate.
+ */
+void inline
+ate_write(struct pcibus_info *pcibus_info, int ate_index, int count,
+ volatile uint64_t ate)
+{
+ while (count-- > 0) {
+ if (ate_index < pcibus_info->pbi_int_ate_size) {
+ pcireg_int_ate_set(pcibus_info, ate_index, ate);
+ } else {
+ panic("ate_write: invalid ate_index 0x%x", ate_index);
+ }
+ ate_index++;
+ ate += IOPGSIZE;
+ }
+
+ pcireg_tflush_get(pcibus_info); /* wait until Bridge PIO complete */
+}
+
+void pcibr_ate_free(struct pcibus_info *pcibus_info, int index)
+{
+
+ volatile uint64_t ate;
+ int count;
+ uint64_t flags;
+
+ if (pcibr_invalidate_ate) {
+ /* For debugging purposes, clear the valid bit in the ATE */
+ ate = *pcibr_ate_addr(pcibus_info, index);
+ count = pcibus_info->pbi_int_ate_resource.ate[index];
+ ate_write(pcibus_info, index, count, (ate & ~PCI32_ATE_V));
+ }
+
+ flags = pcibr_lock(pcibus_info);
+ free_ate_resource(&pcibus_info->pbi_int_ate_resource, index);
+ pcibr_unlock(pcibus_info, flags);
+}