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