arch/sparc/kernel/of_device_common.c

   1 #include <linux/string.h>
   2 #include <linux/kernel.h>
   3 #include <linux/of.h>
   4 #include <linux/init.h>
   5 #include <linux/module.h>
   6 #include <linux/mod_devicetable.h>
   7 #include <linux/slab.h>
   8 #include <linux/errno.h>
   9 #include <linux/irq.h>
  10 #include <linux/of_device.h>
  11 #include <linux/of_platform.h>
  12
  13 #include "of_device_common.h"
  14
  15 static int node_match(struct device *dev, void *data)
  16 {
  17         struct of_device *op = to_of_device(dev);
  18         struct device_node *dp = data;
  19
  20         return (op->node == dp);
  21 }
  22
  23 struct of_device *of_find_device_by_node(struct device_node *dp)
  24 {
  25         struct device *dev = bus_find_device(&of_platform_bus_type, NULL,
  26                                              dp, node_match);
  27
  28         if (dev)
  29                 return to_of_device(dev);
  30
  31         return NULL;
  32 }
  33 EXPORT_SYMBOL(of_find_device_by_node);
  34
  35 unsigned int irq_of_parse_and_map(struct device_node *node, int index)
  36 {
  37         struct of_device *op = of_find_device_by_node(node);
  38
  39         if (!op || index >= op->num_irqs)
  40                 return 0;
  41
  42         return op->irqs[index];
  43 }
  44 EXPORT_SYMBOL(irq_of_parse_and_map);
  45
  46 /* Take the archdata values for IOMMU, STC, and HOSTDATA found in
  47  * BUS and propagate to all child of_device objects.
  48  */
  49 void of_propagate_archdata(struct of_device *bus)
  50 {
  51         struct dev_archdata *bus_sd = &bus->dev.archdata;
  52         struct device_node *bus_dp = bus->node;
  53         struct device_node *dp;
  54
  55         for (dp = bus_dp->child; dp; dp = dp->sibling) {
  56                 struct of_device *op = of_find_device_by_node(dp);
  57
  58                 op->dev.archdata.iommu = bus_sd->iommu;
  59                 op->dev.archdata.stc = bus_sd->stc;
  60                 op->dev.archdata.host_controller = bus_sd->host_controller;
  61                 op->dev.archdata.numa_node = bus_sd->numa_node;
  62
  63                 if (dp->child)
  64                         of_propagate_archdata(op);
  65         }
  66 }
  67
  68 struct bus_type of_platform_bus_type;
  69 EXPORT_SYMBOL(of_platform_bus_type);
  70
  71 static void get_cells(struct device_node *dp, int *addrc, int *sizec)
  72 {
  73         if (addrc)
  74                 *addrc = of_n_addr_cells(dp);
  75         if (sizec)
  76                 *sizec = of_n_size_cells(dp);
  77 }
  78
  79 /*
  80  * Default translator (generic bus)
  81  */
  82
  83 void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec)
  84 {
  85         get_cells(dev, addrc, sizec);
  86 }
  87
  88 /* Make sure the least significant 64-bits are in-range.  Even
  89  * for 3 or 4 cell values it is a good enough approximation.
  90  */
  91 int of_out_of_range(const u32 *addr, const u32 *base,
  92                     const u32 *size, int na, int ns)
  93 {
  94         u64 a = of_read_addr(addr, na);
  95         u64 b = of_read_addr(base, na);
  96
  97         if (a < b)
  98                 return 1;
  99
 100         b += of_read_addr(size, ns);
 101         if (a >= b)
 102                 return 1;
 103
 104         return 0;
 105 }
 106
 107 int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna)
 108 {
 109         u32 result[OF_MAX_ADDR_CELLS];
 110         int i;
 111
 112         if (ns > 2) {
 113                 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
 114                 return -EINVAL;
 115         }
 116
 117         if (of_out_of_range(addr, range, range + na + pna, na, ns))
 118                 return -EINVAL;
 119
 120         /* Start with the parent range base.  */
 121         memcpy(result, range + na, pna * 4);
 122
 123         /* Add in the child address offset.  */
 124         for (i = 0; i < na; i++)
 125                 result[pna - 1 - i] +=
 126                         (addr[na - 1 - i] -
 127                          range[na - 1 - i]);
 128
 129         memcpy(addr, result, pna * 4);
 130
 131         return 0;
 132 }
 133
 134 unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
 135 {
 136         if (flags)
 137                 return flags;
 138         return IORESOURCE_MEM;
 139 }
 140
 141 /*
 142  * SBUS bus specific translator
 143  */
 144
 145 int of_bus_sbus_match(struct device_node *np)
 146 {
 147         struct device_node *dp = np;
 148
 149         while (dp) {
 150                 if (!strcmp(dp->name, "sbus") ||
 151                     !strcmp(dp->name, "sbi"))
 152                         return 1;
 153
 154                 /* Have a look at use_1to1_mapping().  We're trying
 155                  * to match SBUS if that's the top-level bus and we
 156                  * don't have some intervening real bus that provides
 157                  * ranges based translations.
 158                  */
 159                 if (of_find_property(dp, "ranges", NULL) != NULL)
 160                         break;
 161
 162                 dp = dp->parent;
 163         }
 164
 165         return 0;
 166 }
 167
 168 void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec)
 169 {
 170         if (addrc)
 171                 *addrc = 2;
 172         if (sizec)
 173                 *sizec = 1;
 174 }