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@@ -0,0 +1,137 @@
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+/*
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+ * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
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+ * <benh@kernel.crashing.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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+ * the GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+ */
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+
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+#undef DEBUG
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+
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+#include <linux/kernel.h>
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+#include <asm/prom.h>
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+#include <asm/dcr.h>
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+
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+unsigned int dcr_resource_start(struct device_node *np, unsigned int index)
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+{
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+ unsigned int ds;
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+ const u32 *dr = get_property(np, "dcr-reg", &ds);
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+
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+ if (dr == NULL || ds & 1 || index >= (ds / 8))
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+ return 0;
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+
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+ return dr[index * 2];
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+}
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+
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+unsigned int dcr_resource_len(struct device_node *np, unsigned int index)
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+{
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+ unsigned int ds;
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+ const u32 *dr = get_property(np, "dcr-reg", &ds);
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+
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+ if (dr == NULL || ds & 1 || index >= (ds / 8))
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+ return 0;
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+
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+ return dr[index * 2 + 1];
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+}
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+
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+#ifndef CONFIG_PPC_DCR_NATIVE
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+
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+static struct device_node * find_dcr_parent(struct device_node * node)
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+{
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+ struct device_node *par, *tmp;
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+ const u32 *p;
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+
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+ for (par = of_node_get(node); par;) {
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+ if (get_property(par, "dcr-controller", NULL))
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+ break;
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+ p = get_property(par, "dcr-parent", NULL);
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+ tmp = par;
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+ if (p == NULL)
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+ par = of_get_parent(par);
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+ else
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+ par = of_find_node_by_phandle(*p);
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+ of_node_put(tmp);
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+ }
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+ return par;
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+}
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+
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+u64 of_translate_dcr_address(struct device_node *dev,
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+ unsigned int dcr_n,
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+ unsigned int *out_stride)
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+{
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+ struct device_node *dp;
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+ const u32 *p;
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+ unsigned int stride;
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+ u64 ret;
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+
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+ dp = find_dcr_parent(dev);
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+ if (dp == NULL)
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+ return OF_BAD_ADDR;
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+
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+ /* Stride is not properly defined yet, default to 0x10 for Axon */
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+ p = get_property(dp, "dcr-mmio-stride", NULL);
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+ stride = (p == NULL) ? 0x10 : *p;
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+
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+ /* XXX FIXME: Which property name is to use of the 2 following ? */
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+ p = get_property(dp, "dcr-mmio-range", NULL);
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+ if (p == NULL)
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+ p = get_property(dp, "dcr-mmio-space", NULL);
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+ if (p == NULL)
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+ return OF_BAD_ADDR;
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+
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+ /* Maybe could do some better range checking here */
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+ ret = of_translate_address(dp, p);
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+ if (ret != OF_BAD_ADDR)
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+ ret += (u64)(stride) * (u64)dcr_n;
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+ if (out_stride)
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+ *out_stride = stride;
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+ return ret;
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+}
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+
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+dcr_host_t dcr_map(struct device_node *dev, unsigned int dcr_n,
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+ unsigned int dcr_c)
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+{
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+ dcr_host_t ret = { .token = NULL, .stride = 0 };
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+ u64 addr;
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+
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+ pr_debug("dcr_map(%s, 0x%x, 0x%x)\n",
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+ dev->full_name, dcr_n, dcr_c);
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+
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+ addr = of_translate_dcr_address(dev, dcr_n, &ret.stride);
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+ pr_debug("translates to addr: 0x%lx, stride: 0x%x\n",
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+ addr, ret.stride);
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+ if (addr == OF_BAD_ADDR)
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+ return ret;
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+ pr_debug("mapping 0x%x bytes\n", dcr_c * ret.stride);
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+ ret.token = ioremap(addr, dcr_c * ret.stride);
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+ if (ret.token == NULL)
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+ return ret;
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+ pr_debug("mapped at 0x%p -> base is 0x%p\n",
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+ ret.token, ret.token - dcr_n * ret.stride);
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+ ret.token -= dcr_n * ret.stride;
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+ return ret;
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+}
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+
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+void dcr_unmap(dcr_host_t host, unsigned int dcr_n, unsigned int dcr_c)
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+{
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+ dcr_host_t h = host;
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+
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+ if (h.token == NULL)
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+ return;
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+ h.token -= dcr_n * h.stride;
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+ iounmap(h.token);
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+ h.token = NULL;
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+}
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+
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+#endif /* !defined(CONFIG_PPC_DCR_NATIVE) */
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Benjamin Herrenschmidt