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/export.h>
   5 #include <linux/mod_devicetable.h>
   6 #include <linux/errno.h>
   7 #include <linux/irq.h>
   8 #include <linux/of_device.h>
   9 #include <linux/of_platform.h>
  10
  11 #include "of_device_common.h"
  12
  13 unsigned int irq_of_parse_and_map(struct device_node *node, int index)
  14 {
  15         struct platform_device *op = of_find_device_by_node(node);
  16
  17         if (!op || index >= op->archdata.num_irqs)
  18                 return 0;
  19
  20         return op->archdata.irqs[index];
  21 }
  22 EXPORT_SYMBOL(irq_of_parse_and_map);
  23
  24 int of_address_to_resource(struct device_node *node, int index,
  25                            struct resource *r)
  26 {
  27         struct platform_device *op = of_find_device_by_node(node);
  28
  29         if (!op || index >= op->num_resources)
  30                 return -EINVAL;
  31
  32         memcpy(r, &op->archdata.resource[index], sizeof(*r));
  33         return 0;
  34 }
  35 EXPORT_SYMBOL_GPL(of_address_to_resource);
  36
  37 void __iomem *of_iomap(struct device_node *node, int index)
  38 {
  39         struct platform_device *op = of_find_device_by_node(node);
  40         struct resource *r;
  41
  42         if (!op || index >= op->num_resources)
  43                 return NULL;
  44
  45         r = &op->archdata.resource[index];
  46
  47         return of_ioremap(r, 0, resource_size(r), (char *) r->name);
  48 }
  49 EXPORT_SYMBOL(of_iomap);
  50
  51 /* Take the archdata values for IOMMU, STC, and HOSTDATA found in
  52  * BUS and propagate to all child platform_device objects.
  53  */
  54 void of_propagate_archdata(struct platform_device *bus)
  55 {
  56         struct dev_archdata *bus_sd = &bus->dev.archdata;
  57         struct device_node *bus_dp = bus->dev.of_node;
  58         struct device_node *dp;
  59
  60         for (dp = bus_dp->child; dp; dp = dp->sibling) {
  61                 struct platform_device *op = of_find_device_by_node(dp);
  62
  63                 op->dev.archdata.iommu = bus_sd->iommu;
  64                 op->dev.archdata.stc = bus_sd->stc;
  65                 op->dev.archdata.host_controller = bus_sd->host_controller;
  66                 op->dev.archdata.numa_node = bus_sd->numa_node;
  67
  68                 if (dp->child)
  69                         of_propagate_archdata(op);
  70         }
  71 }
  72
  73 static void get_cells(struct device_node *dp, int *addrc, int *sizec)
  74 {
  75         if (addrc)
  76                 *addrc = of_n_addr_cells(dp);
  77         if (sizec)
  78                 *sizec = of_n_size_cells(dp);
  79 }
  80
  81 /*
  82  * Default translator (generic bus)
  83  */
  84
  85 void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec)
  86 {
  87         get_cells(dev, addrc, sizec);
  88 }
  89
  90 /* Make sure the least significant 64-bits are in-range.  Even
  91  * for 3 or 4 cell values it is a good enough approximation.
  92  */
  93 int of_out_of_range(const u32 *addr, const u32 *base,
  94                     const u32 *size, int na, int ns)
  95 {
  96         u64 a = of_read_addr(addr, na);
  97         u64 b = of_read_addr(base, na);
  98
  99         if (a < b)
 100                 return 1;
 101
 102         b += of_read_addr(size, ns);
 103         if (a >= b)
 104                 return 1;
 105
 106         return 0;
 107 }
 108
 109 int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna)
 110 {
 111         u32 result[OF_MAX_ADDR_CELLS];
 112         int i;
 113
 114         if (ns > 2) {
 115                 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
 116                 return -EINVAL;
 117         }
 118
 119         if (of_out_of_range(addr, range, range + na + pna, na, ns))
 120                 return -EINVAL;
 121
 122         /* Start with the parent range base.  */
 123         memcpy(result, range + na, pna * 4);
 124
 125         /* Add in the child address offset.  */
 126         for (i = 0; i < na; i++)
 127                 result[pna - 1 - i] +=
 128                         (addr[na - 1 - i] -
 129                          range[na - 1 - i]);
 130
 131         memcpy(addr, result, pna * 4);
 132
 133         return 0;
 134 }
 135
 136 unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
 137 {
 138         if (flags)
 139                 return flags;
 140         return IORESOURCE_MEM;
 141 }
 142
 143 /*
 144  * SBUS bus specific translator
 145  */
 146
 147 int of_bus_sbus_match(struct device_node *np)
 148 {
 149         struct device_node *dp = np;
 150
 151         while (dp) {
 152                 if (!strcmp(dp->name, "sbus") ||
 153                     !strcmp(dp->name, "sbi"))
 154                         return 1;
 155
 156                 /* Have a look at use_1to1_mapping().  We're trying
 157                  * to match SBUS if that's the top-level bus and we
 158                  * don't have some intervening real bus that provides
 159                  * ranges based translations.
 160                  */
 161                 if (of_find_property(dp, "ranges", NULL) != NULL)
 162                         break;
 163
 164                 dp = dp->parent;
 165         }
 166
 167         return 0;
 168 }
 169
 170 void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec)
 171 {
 172         if (addrc)
 173                 *addrc = 2;
 174         if (sizec)
 175                 *sizec = 1;
 176 }