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