1 files changed, 109 insertions, 58 deletions

diff --git a/arch/sparc/kernel/of_device.c b/arch/sparc/kernel/of_device.c
index bbd3203b86af..5a2faad5d043 100644
--- a/arch/sparc/kernel/of_device.c
+++ b/arch/sparc/kernel/of_device.c
@@ -183,7 +183,7 @@ struct bus_type of_bus_type = {
 };
 EXPORT_SYMBOL(of_bus_type);
 
-static inline u64 of_read_addr(u32 *cell, int size)
+static inline u64 of_read_addr(const u32 *cell, int size)
 {
         u64 r = 0;
         while (size--)
@@ -209,8 +209,8 @@ struct of_bus {
         int             (*match)(struct device_node *parent);
         void            (*count_cells)(struct device_node *child,
                                        int *addrc, int *sizec);
-        u64             (*map)(u32 *addr, u32 *range, int na, int ns, int pna);
-        int             (*translate)(u32 *addr, u64 offset, int na);
+        int             (*map)(u32 *addr, const u32 *range,
+                               int na, int ns, int pna);
         unsigned int    (*get_flags)(u32 *addr);
 };
 
@@ -224,27 +224,49 @@ static void of_bus_default_count_cells(struct device_node *dev,
         get_cells(dev, addrc, sizec);
 }
 
-static u64 of_bus_default_map(u32 *addr, u32 *range, int na, int ns, int pna)
+/* Make sure the least significant 64-bits are in-range.  Even
+ * for 3 or 4 cell values it is a good enough approximation.
+ */
+static int of_out_of_range(const u32 *addr, const u32 *base,
+                           const u32 *size, int na, int ns)
 {
-        u64 cp, s, da;
+        u64 a = of_read_addr(addr, na);
+        u64 b = of_read_addr(base, na);
+
+        if (a < b)
+                return 1;
 
-        cp = of_read_addr(range, na);
-        s  = of_read_addr(range + na + pna, ns);
-        da = of_read_addr(addr, na);
+        b += of_read_addr(size, ns);
+        if (a >= b)
+                return 1;
 
-        if (da < cp || da >= (cp + s))
-                return OF_BAD_ADDR;
-        return da - cp;
+        return 0;
 }
 
-static int of_bus_default_translate(u32 *addr, u64 offset, int na)
+static int of_bus_default_map(u32 *addr, const u32 *range,
+                              int na, int ns, int pna)
 {
-        u64 a = of_read_addr(addr, na);
-        memset(addr, 0, na * 4);
-        a += offset;
-        if (na > 1)
-                addr[na - 2] = a >> 32;
-        addr[na - 1] = a & 0xffffffffu;
+        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;
 }
@@ -254,14 +276,26 @@ static unsigned int of_bus_default_get_flags(u32 *addr)
         return IORESOURCE_MEM;
 }
 
-
 /*
  * PCI bus specific translator
  */
 
 static int of_bus_pci_match(struct device_node *np)
 {
-        return !strcmp(np->type, "pci") || !strcmp(np->type, "pciex");
+        if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
+                /* Do not do PCI specific frobbing if the
+                 * PCI bridge lacks a ranges property.  We
+                 * want to pass it through up to the next
+                 * parent as-is, not with the PCI translate
+                 * method which chops off the top address cell.
+                 */
+                if (!of_find_property(np, "ranges", NULL))
+                        return 0;
+
+                return 1;
+        }
+
+        return 0;
 }
 
 static void of_bus_pci_count_cells(struct device_node *np,
@@ -273,27 +307,32 @@ static void of_bus_pci_count_cells(struct device_node *np,
                 *sizec = 2;
 }
 
-static u64 of_bus_pci_map(u32 *addr, u32 *range, int na, int ns, int pna)
+static int of_bus_pci_map(u32 *addr, const u32 *range,
+                          int na, int ns, int pna)
 {
-        u64 cp, s, da;
+        u32 result[OF_MAX_ADDR_CELLS];
+        int i;
 
         /* Check address type match */
         if ((addr[0] ^ range[0]) & 0x03000000)
-                return OF_BAD_ADDR;
+                return -EINVAL;
 
-        /* Read address values, skipping high cell */
-        cp = of_read_addr(range + 1, na - 1);
-        s  = of_read_addr(range + na + pna, ns);
-        da = of_read_addr(addr + 1, na - 1);
+        if (of_out_of_range(addr + 1, range + 1, range + na + pna,
+                            na - 1, ns))
+                return -EINVAL;
 
-        if (da < cp || da >= (cp + s))
-                return OF_BAD_ADDR;
-        return da - cp;
-}
+        /* Start with the parent range base.  */
+        memcpy(result, range + na, pna * 4);
 
-static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
-{
-        return of_bus_default_translate(addr + 1, offset, na - 1);
+        /* Add in the child address offset, skipping high cell.  */
+        for (i = 0; i < na - 1; i++)
+                result[pna - 1 - i] +=
+                        (addr[na - 1 - i] -
+                         range[na - 1 - i]);
+
+        memcpy(addr, result, pna * 4);
+
+        return 0;
 }
 
 static unsigned int of_bus_pci_get_flags(u32 *addr)
@@ -332,16 +371,11 @@ static void of_bus_sbus_count_cells(struct device_node *child,
                 *sizec = 1;
 }
 
-static u64 of_bus_sbus_map(u32 *addr, u32 *range, int na, int ns, int pna)
+static int of_bus_sbus_map(u32 *addr, const u32 *range, int na, int ns, int pna)
 {
         return of_bus_default_map(addr, range, na, ns, pna);
 }
 
-static int of_bus_sbus_translate(u32 *addr, u64 offset, int na)
-{
-        return of_bus_default_translate(addr, offset, na);
-}
-
 static unsigned int of_bus_sbus_get_flags(u32 *addr)
 {
         return IORESOURCE_MEM;
@@ -360,7 +394,6 @@ static struct of_bus of_busses[] = {
                 .match = of_bus_pci_match,
                 .count_cells = of_bus_pci_count_cells,
                 .map = of_bus_pci_map,
-                .translate = of_bus_pci_translate,
                 .get_flags = of_bus_pci_get_flags,
         },
         /* SBUS */
@@ -370,7 +403,6 @@ static struct of_bus of_busses[] = {
                 .match = of_bus_sbus_match,
                 .count_cells = of_bus_sbus_count_cells,
                 .map = of_bus_sbus_map,
-                .translate = of_bus_sbus_translate,
                 .get_flags = of_bus_sbus_get_flags,
         },
         /* Default */
@@ -380,7 +412,6 @@ static struct of_bus of_busses[] = {
                 .match = NULL,
                 .count_cells = of_bus_default_count_cells,
                 .map = of_bus_default_map,
-                .translate = of_bus_default_translate,
                 .get_flags = of_bus_default_get_flags,
         },
 };
@@ -405,33 +436,34 @@ static int __init build_one_resource(struct device_node *parent,
         u32 *ranges;
         unsigned int rlen;
         int rone;
-        u64 offset = OF_BAD_ADDR;
 
         ranges = of_get_property(parent, "ranges", &rlen);
         if (ranges == NULL || rlen == 0) {
-                offset = of_read_addr(addr, na);
-                memset(addr, 0, pna * 4);
-                goto finish;
+                u32 result[OF_MAX_ADDR_CELLS];
+                int i;
+
+                memset(result, 0, pna * 4);
+                for (i = 0; i < na; i++)
+                        result[pna - 1 - i] =
+                                addr[na - 1 - i];
+
+                memcpy(addr, result, pna * 4);
+                return 0;
         }
 
         /* Now walk through the ranges */
         rlen /= 4;
         rone = na + pna + ns;
         for (; rlen >= rone; rlen -= rone, ranges += rone) {
-                offset = bus->map(addr, ranges, na, ns, pna);
-                if (offset != OF_BAD_ADDR)
-                        break;
+                if (!bus->map(addr, ranges, na, ns, pna))
+                        return 0;
         }
-        if (offset == OF_BAD_ADDR)
-                return 1;
-
-        memcpy(addr, ranges + na, 4 * pna);
 
-finish:
-        /* Translate it into parent bus space */
-        return pbus->translate(addr, offset, pna);
+        return 1;
 }
 
+static int of_resource_verbose;
+
 static void __init build_device_resources(struct of_device *op,
                                           struct device *parent)
 {
@@ -497,7 +529,8 @@ static void __init build_device_resources(struct of_device *op,
                         pbus = of_match_bus(pp);
                         pbus->count_cells(dp, &pna, &pns);
 
-                        if (build_one_resource(dp, bus, pbus, addr, dna, dns, pna))
+                        if (build_one_resource(dp, bus, pbus, addr,
+                                               dna, dns, pna))
                                 break;
 
                         dna = pna;
@@ -507,6 +540,12 @@ static void __init build_device_resources(struct of_device *op,
 
         build_res:
                 memset(r, 0, sizeof(*r));
+
+                if (of_resource_verbose)
+                        printk("%s reg[%d] -> %llx\n",
+                               op->node->full_name, index,
+                               result);
+
                 if (result != OF_BAD_ADDR) {
                         r->start = result & 0xffffffff;
                         r->end = result + size - 1;
@@ -643,6 +682,18 @@ static int __init of_bus_driver_init(void)
 
 postcore_initcall(of_bus_driver_init);
 
+static int __init of_debug(char *str)
+{
+        int val = 0;
+
+        get_option(&str, &val);
+        if (val & 1)
+                of_resource_verbose = 1;
+        return 1;
+}
+
+__setup("of_debug=", of_debug);
+
 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
 {
         /* initialize common driver fields */