sparc: move of_device common code to of_device_common

This patch moves code common to of_device_32.c and of_device_64.c into
of_device_common.h and of_device_common.c.

The only functional difference is in sparc32 where of_bus_default_map is
used in place of of_bus_sbus_map because they are equivelent.

There is still room for further code consolidation with some minor
refactoring.

Boot tested on sparc32 and compile tested on sparc64.

Signed-off-by: Robert Reif <reif@earthlink.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 174 insertions, 0 deletions

diff --git a/arch/sparc/kernel/of_device_common.c b/arch/sparc/kernel/of_device_common.c
new file mode 100644
index 000000000000..cb8eb799bb6c
--- /dev/null
+++ b/arch/sparc/kernel/of_device_common.c
@@ -0,0 +1,174 @@
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/irq.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+
+#include "of_device_common.h"
+
+static int node_match(struct device *dev, void *data)
+{
+        struct of_device *op = to_of_device(dev);
+        struct device_node *dp = data;
+
+        return (op->node == dp);
+}
+
+struct of_device *of_find_device_by_node(struct device_node *dp)
+{
+        struct device *dev = bus_find_device(&of_platform_bus_type, NULL,
+                                             dp, node_match);
+
+        if (dev)
+                return to_of_device(dev);
+
+        return NULL;
+}
+EXPORT_SYMBOL(of_find_device_by_node);
+
+unsigned int irq_of_parse_and_map(struct device_node *node, int index)
+{
+        struct of_device *op = of_find_device_by_node(node);
+
+        if (!op || index >= op->num_irqs)
+                return 0;
+
+        return op->irqs[index];
+}
+EXPORT_SYMBOL(irq_of_parse_and_map);
+
+/* Take the archdata values for IOMMU, STC, and HOSTDATA found in
+ * BUS and propagate to all child of_device objects.
+ */
+void of_propagate_archdata(struct of_device *bus)
+{
+        struct dev_archdata *bus_sd = &bus->dev.archdata;
+        struct device_node *bus_dp = bus->node;
+        struct device_node *dp;
+
+        for (dp = bus_dp->child; dp; dp = dp->sibling) {
+                struct of_device *op = of_find_device_by_node(dp);
+
+                op->dev.archdata.iommu = bus_sd->iommu;
+                op->dev.archdata.stc = bus_sd->stc;
+                op->dev.archdata.host_controller = bus_sd->host_controller;
+                op->dev.archdata.numa_node = bus_sd->numa_node;
+
+                if (dp->child)
+                        of_propagate_archdata(op);
+        }
+}
+
+struct bus_type of_platform_bus_type;
+EXPORT_SYMBOL(of_platform_bus_type);
+
+static void get_cells(struct device_node *dp, int *addrc, int *sizec)
+{
+        if (addrc)
+                *addrc = of_n_addr_cells(dp);
+        if (sizec)
+                *sizec = of_n_size_cells(dp);
+}
+
+/*
+ * Default translator (generic bus)
+ */
+
+void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec)
+{
+        get_cells(dev, addrc, sizec);
+}
+
+/* Make sure the least significant 64-bits are in-range.  Even
+ * for 3 or 4 cell values it is a good enough approximation.
+ */
+int of_out_of_range(const u32 *addr, const u32 *base,
+                    const u32 *size, int na, int ns)
+{
+        u64 a = of_read_addr(addr, na);
+        u64 b = of_read_addr(base, na);
+
+        if (a < b)
+                return 1;
+
+        b += of_read_addr(size, ns);
+        if (a >= b)
+                return 1;
+
+        return 0;
+}
+
+int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna)
+{
+        u32 result[OF_MAX_ADDR_CELLS];
+        int i;
+
+        if (ns > 2) {
+                printk("of_device: Cannot handle size cells (%d) > 2.", ns);
+                return -EINVAL;
+        }
+
+        if (of_out_of_range(addr, range, range + na + pna, na, ns))
+                return -EINVAL;
+
+        /* Start with the parent range base.  */
+        memcpy(result, range + na, pna * 4);
+
+        /* Add in the child address offset.  */
+        for (i = 0; i < na; i++)
+                result[pna - 1 - i] +=
+                        (addr[na - 1 - i] -
+                         range[na - 1 - i]);
+
+        memcpy(addr, result, pna * 4);
+
+        return 0;
+}
+
+unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
+{
+        if (flags)
+                return flags;
+        return IORESOURCE_MEM;
+}
+
+/*
+ * SBUS bus specific translator
+ */
+
+int of_bus_sbus_match(struct device_node *np)
+{
+        struct device_node *dp = np;
+
+        while (dp) {
+                if (!strcmp(dp->name, "sbus") ||
+                    !strcmp(dp->name, "sbi"))
+                        return 1;
+
+                /* Have a look at use_1to1_mapping().  We're trying
+                 * to match SBUS if that's the top-level bus and we
+                 * don't have some intervening real bus that provides
+                 * ranges based translations.
+                 */
+                if (of_find_property(dp, "ranges", NULL) != NULL)
+                        break;
+
+                dp = dp->parent;
+        }
+
+        return 0;
+}
+
+void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec)
+{
+        if (addrc)
+                *addrc = 2;
+        if (sizec)
+                *sizec = 1;
+}