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/export.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 int of_address_to_resource(struct device_node *node, int index,
  26                            struct resource *r)
  27 {
  28         struct platform_device *op = of_find_device_by_node(node);
  29
  30         if (!op || index >= op->num_resources)
  31                 return -EINVAL;
  32
  33         memcpy(r, &op->archdata.resource[index], sizeof(*r));
  34         return 0;
  35 }
  36 EXPORT_SYMBOL_GPL(of_address_to_resource);
  37
  38 void __iomem *of_iomap(struct device_node *node, int index)
  39 {
  40         struct platform_device *op = of_find_device_by_node(node);
  41         struct resource *r;
  42
  43         if (!op || index >= op->num_resources)
  44                 return NULL;
  45
  46         r = &op->archdata.resource[index];
  47
  48         return of_ioremap(r, 0, resource_size(r), (char *) r->name);
  49 }
  50 EXPORT_SYMBOL(of_iomap);
  51
  52 /* Take the archdata values for IOMMU, STC, and HOSTDATA found in
  53  * BUS and propagate to all child platform_device objects.
  54  */
  55 void of_propagate_archdata(struct platform_device *bus)
  56 {
  57         struct dev_archdata *bus_sd = &bus->dev.archdata;
  58         struct device_node *bus_dp = bus->dev.of_node;
  59         struct device_node *dp;
  60
  61         for (dp = bus_dp->child; dp; dp = dp->sibling) {
  62                 struct platform_device *op = of_find_device_by_node(dp);
  63
  64                 op->dev.archdata.iommu = bus_sd->iommu;
  65                 op->dev.archdata.stc = bus_sd->stc;
  66                 op->dev.archdata.host_controller = bus_sd->host_controller;
  67                 op->dev.archdata.numa_node = bus_sd->numa_node;
  68
  69                 if (dp->child)
  70                         of_propagate_archdata(op);
  71         }
  72 }
  73
  74 static void get_cells(struct device_node *dp, int *addrc, int *sizec)
  75 {
  76         if (addrc)
  77                 *addrc = of_n_addr_cells(dp);
  78         if (sizec)
  79                 *sizec = of_n_size_cells(dp);
  80 }
  81
  82 /*
  83  * Default translator (generic bus)
  84  */
  85
  86 void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec)
  87 {
  88         get_cells(dev, addrc, sizec);
  89 }
  90
  91 /* Make sure the least significant 64-bits are in-range.  Even
  92  * for 3 or 4 cell values it is a good enough approximation.
  93  */
  94 int of_out_of_range(const u32 *addr, const u32 *base,
  95                     const u32 *size, int na, int ns)
  96 {
  97         u64 a = of_read_addr(addr, na);
  98         u64 b = of_read_addr(base, na);
  99
 100         if (a < b)
 101                 return 1;
 102
 103         b += of_read_addr(size, ns);
 104         if (a >= b)
 105                 return 1;
 106
 107         return 0;
 108 }
 109
 110 int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna)
 111 {
 112         u32 result[OF_MAX_ADDR_CELLS];
 113         int i;
 114
 115         if (ns > 2) {
 116                 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
 117                 return -EINVAL;
 118         }
 119
 120         if (of_out_of_range(addr, range, range + na + pna, na, ns))
 121                 return -EINVAL;
 122
 123         /* Start with the parent range base.  */
 124         memcpy(result, range + na, pna * 4);
 125
 126         /* Add in the child address offset.  */
 127         for (i = 0; i < na; i++)
 128                 result[pna - 1 - i] +=
 129                         (addr[na - 1 - i] -
 130                          range[na - 1 - i]);
 131
 132         memcpy(addr, result, pna * 4);
 133
 134         return 0;
 135 }
 136
 137 unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
 138 {
 139         if (flags)
 140                 return flags;
 141         return IORESOURCE_MEM;
 142 }
 143
 144 /*
 145  * SBUS bus specific translator
 146  */
 147
 148 int of_bus_sbus_match(struct device_node *np)
 149 {
 150         struct device_node *dp = np;
 151
 152         while (dp) {
 153                 if (!strcmp(dp->name, "sbus") ||
 154                     !strcmp(dp->name, "sbi"))
 155                         return 1;
 156
 157                 /* Have a look at use_1to1_mapping().  We're trying
 158                  * to match SBUS if that's the top-level bus and we
 159                  * don't have some intervening real bus that provides
 160                  * ranges based translations.
 161                  */
 162                 if (of_find_property(dp, "ranges", NULL) != NULL)
 163                         break;
 164
 165                 dp = dp->parent;
 166         }
 167
 168         return 0;
 169 }
 170
 171 void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec)
 172 {
 173         if (addrc)
 174                 *addrc = 2;
 175         if (sizec)
 176                 *sizec = 1;
 177 }