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-rw-r--r--drivers/fmc/fmc-sdb.c265
1 files changed, 265 insertions, 0 deletions
diff --git a/drivers/fmc/fmc-sdb.c b/drivers/fmc/fmc-sdb.c
new file mode 100644
index 000000000000..74fb326f4af1
--- /dev/null
+++ b/drivers/fmc/fmc-sdb.c
@@ -0,0 +1,265 @@
+/*
+ * Copyright (C) 2012 CERN (www.cern.ch)
+ * Author: Alessandro Rubini <rubini@gnudd.com>
+ *
+ * Released according to the GNU GPL, version 2 or any later version.
+ *
+ * This work is part of the White Rabbit project, a research effort led
+ * by CERN, the European Institute for Nuclear Research.
+ */
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/fmc.h>
+#include <linux/sdb.h>
+#include <linux/err.h>
+#include <linux/fmc-sdb.h>
+#include <asm/byteorder.h>
+
+static uint32_t __sdb_rd(struct fmc_device *fmc, unsigned long address,
+ int convert)
+{
+ uint32_t res = fmc_readl(fmc, address);
+ if (convert)
+ return __be32_to_cpu(res);
+ return res;
+}
+
+static struct sdb_array *__fmc_scan_sdb_tree(struct fmc_device *fmc,
+ unsigned long sdb_addr,
+ unsigned long reg_base, int level)
+{
+ uint32_t onew;
+ int i, j, n, convert = 0;
+ struct sdb_array *arr, *sub;
+
+ onew = fmc_readl(fmc, sdb_addr);
+ if (onew == SDB_MAGIC) {
+ /* Uh! If we are little-endian, we must convert */
+ if (SDB_MAGIC != __be32_to_cpu(SDB_MAGIC))
+ convert = 1;
+ } else if (onew == __be32_to_cpu(SDB_MAGIC)) {
+ /* ok, don't convert */
+ } else {
+ return ERR_PTR(-ENOENT);
+ }
+ /* So, the magic was there: get the count from offset 4*/
+ onew = __sdb_rd(fmc, sdb_addr + 4, convert);
+ n = __be16_to_cpu(*(uint16_t *)&onew);
+ arr = kzalloc(sizeof(*arr), GFP_KERNEL);
+ if (arr) {
+ arr->record = kzalloc(sizeof(arr->record[0]) * n, GFP_KERNEL);
+ arr->subtree = kzalloc(sizeof(arr->subtree[0]) * n, GFP_KERNEL);
+ }
+ if (!arr || !arr->record || !arr->subtree) {
+ kfree(arr->record);
+ kfree(arr->subtree);
+ kfree(arr);
+ return ERR_PTR(-ENOMEM);
+ }
+ arr->len = n;
+ arr->level = level;
+ arr->fmc = fmc;
+ for (i = 0; i < n; i++) {
+ union sdb_record *r;
+
+ for (j = 0; j < sizeof(arr->record[0]); j += 4) {
+ *(uint32_t *)((void *)(arr->record + i) + j) =
+ __sdb_rd(fmc, sdb_addr + (i * 64) + j, convert);
+ }
+ r = &arr->record[i];
+ arr->subtree[i] = ERR_PTR(-ENODEV);
+ if (r->empty.record_type == sdb_type_bridge) {
+ struct sdb_component *c = &r->bridge.sdb_component;
+ uint64_t subaddr = __be64_to_cpu(r->bridge.sdb_child);
+ uint64_t newbase = __be64_to_cpu(c->addr_first);
+
+ subaddr += reg_base;
+ newbase += reg_base;
+ sub = __fmc_scan_sdb_tree(fmc, subaddr, newbase,
+ level + 1);
+ arr->subtree[i] = sub; /* may be error */
+ if (IS_ERR(sub))
+ continue;
+ sub->parent = arr;
+ sub->baseaddr = newbase;
+ }
+ }
+ return arr;
+}
+
+int fmc_scan_sdb_tree(struct fmc_device *fmc, unsigned long address)
+{
+ struct sdb_array *ret;
+ if (fmc->sdb)
+ return -EBUSY;
+ ret = __fmc_scan_sdb_tree(fmc, address, 0 /* regs */, 0);
+ if (IS_ERR(ret))
+ return PTR_ERR(ret);
+ fmc->sdb = ret;
+ return 0;
+}
+EXPORT_SYMBOL(fmc_scan_sdb_tree);
+
+static void __fmc_sdb_free(struct sdb_array *arr)
+{
+ int i, n;
+
+ if (!arr)
+ return;
+ n = arr->len;
+ for (i = 0; i < n; i++) {
+ if (IS_ERR(arr->subtree[i]))
+ continue;
+ __fmc_sdb_free(arr->subtree[i]);
+ }
+ kfree(arr->record);
+ kfree(arr->subtree);
+ kfree(arr);
+}
+
+int fmc_free_sdb_tree(struct fmc_device *fmc)
+{
+ __fmc_sdb_free(fmc->sdb);
+ fmc->sdb = NULL;
+ return 0;
+}
+EXPORT_SYMBOL(fmc_free_sdb_tree);
+
+/* This helper calls reprogram and inizialized sdb as well */
+int fmc_reprogram(struct fmc_device *fmc, struct fmc_driver *d, char *gw,
+ int sdb_entry)
+{
+ int ret;
+
+ ret = fmc->op->reprogram(fmc, d, gw);
+ if (ret < 0)
+ return ret;
+ if (sdb_entry < 0)
+ return ret;
+
+ /* We are required to find SDB at a given offset */
+ ret = fmc_scan_sdb_tree(fmc, sdb_entry);
+ if (ret < 0) {
+ dev_err(&fmc->dev, "Can't find SDB at address 0x%x\n",
+ sdb_entry);
+ return -ENODEV;
+ }
+ fmc_dump_sdb(fmc);
+ return 0;
+}
+EXPORT_SYMBOL(fmc_reprogram);
+
+static void __fmc_show_sdb_tree(const struct fmc_device *fmc,
+ const struct sdb_array *arr)
+{
+ int i, j, n = arr->len, level = arr->level;
+ const struct sdb_array *ap;
+
+ for (i = 0; i < n; i++) {
+ unsigned long base;
+ union sdb_record *r;
+ struct sdb_product *p;
+ struct sdb_component *c;
+ r = &arr->record[i];
+ c = &r->dev.sdb_component;
+ p = &c->product;
+ base = 0;
+ for (ap = arr; ap; ap = ap->parent)
+ base += ap->baseaddr;
+ dev_info(&fmc->dev, "SDB: ");
+
+ for (j = 0; j < level; j++)
+ printk(KERN_CONT " ");
+ switch (r->empty.record_type) {
+ case sdb_type_interconnect:
+ printk(KERN_CONT "%08llx:%08x %.19s\n",
+ __be64_to_cpu(p->vendor_id),
+ __be32_to_cpu(p->device_id),
+ p->name);
+ break;
+ case sdb_type_device:
+ printk(KERN_CONT "%08llx:%08x %.19s (%08llx-%08llx)\n",
+ __be64_to_cpu(p->vendor_id),
+ __be32_to_cpu(p->device_id),
+ p->name,
+ __be64_to_cpu(c->addr_first) + base,
+ __be64_to_cpu(c->addr_last) + base);
+ break;
+ case sdb_type_bridge:
+ printk(KERN_CONT "%08llx:%08x %.19s (bridge: %08llx)\n",
+ __be64_to_cpu(p->vendor_id),
+ __be32_to_cpu(p->device_id),
+ p->name,
+ __be64_to_cpu(c->addr_first) + base);
+ if (IS_ERR(arr->subtree[i])) {
+ printk(KERN_CONT "(bridge error %li)\n",
+ PTR_ERR(arr->subtree[i]));
+ break;
+ }
+ __fmc_show_sdb_tree(fmc, arr->subtree[i]);
+ break;
+ case sdb_type_integration:
+ printk(KERN_CONT "integration\n");
+ break;
+ case sdb_type_repo_url:
+ printk(KERN_CONT "repo-url\n");
+ break;
+ case sdb_type_synthesis:
+ printk(KERN_CONT "synthesis-info\n");
+ break;
+ case sdb_type_empty:
+ printk(KERN_CONT "empty\n");
+ break;
+ default:
+ printk(KERN_CONT "UNKNOWN TYPE 0x%02x\n",
+ r->empty.record_type);
+ break;
+ }
+ }
+}
+
+void fmc_show_sdb_tree(const struct fmc_device *fmc)
+{
+ if (!fmc->sdb)
+ return;
+ __fmc_show_sdb_tree(fmc, fmc->sdb);
+}
+EXPORT_SYMBOL(fmc_show_sdb_tree);
+
+signed long fmc_find_sdb_device(struct sdb_array *tree,
+ uint64_t vid, uint32_t did, unsigned long *sz)
+{
+ signed long res = -ENODEV;
+ union sdb_record *r;
+ struct sdb_product *p;
+ struct sdb_component *c;
+ int i, n = tree->len;
+ uint64_t last, first;
+
+ /* FIXME: what if the first interconnect is not at zero? */
+ for (i = 0; i < n; i++) {
+ r = &tree->record[i];
+ c = &r->dev.sdb_component;
+ p = &c->product;
+
+ if (!IS_ERR(tree->subtree[i]))
+ res = fmc_find_sdb_device(tree->subtree[i],
+ vid, did, sz);
+ if (res >= 0)
+ return res + tree->baseaddr;
+ if (r->empty.record_type != sdb_type_device)
+ continue;
+ if (__be64_to_cpu(p->vendor_id) != vid)
+ continue;
+ if (__be32_to_cpu(p->device_id) != did)
+ continue;
+ /* found */
+ last = __be64_to_cpu(c->addr_last);
+ first = __be64_to_cpu(c->addr_first);
+ if (sz)
+ *sz = (typeof(*sz))(last + 1 - first);
+ return first + tree->baseaddr;
+ }
+ return res;
+}
+EXPORT_SYMBOL(fmc_find_sdb_device);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-11 15:47:32 +0000