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_platform.h>
   9 #include <linux/of_address.h>
  10 #include <linux/of_device.h>
  11 #include <linux/of_irq.h>
  12
  13 #include "of_device_common.h"
  14
  15 unsigned int irq_of_parse_and_map(struct device_node *node, int index)
  16 {
  17         struct platform_device *op = of_find_device_by_node(node);
  18
  19         if (!op || index >= op->archdata.num_irqs)
  20                 return 0;
  21
  22         return op->archdata.irqs[index];
  23 }
  24 EXPORT_SYMBOL(irq_of_parse_and_map);
  25
  26 int of_address_to_resource(struct device_node *node, int index,
  27                            struct resource *r)
  28 {
  29         struct platform_device *op = of_find_device_by_node(node);
  30
  31         if (!op || index >= op->num_resources)
  32                 return -EINVAL;
  33
  34         memcpy(r, &op->archdata.resource[index], sizeof(*r));
  35         return 0;
  36 }
  37 EXPORT_SYMBOL_GPL(of_address_to_resource);
  38
  39 void __iomem *of_iomap(struct device_node *node, int index)
  40 {
  41         struct platform_device *op = of_find_device_by_node(node);
  42         struct resource *r;
  43
  44         if (!op || index >= op->num_resources)
  45                 return NULL;
  46
  47         r = &op->archdata.resource[index];
  48
  49         return of_ioremap(r, 0, resource_size(r), (char *) r->name);
  50 }
  51 EXPORT_SYMBOL(of_iomap);
  52
  53 /* Take the archdata values for IOMMU, STC, and HOSTDATA found in
  54  * BUS and propagate to all child platform_device objects.
  55  */
  56 void of_propagate_archdata(struct platform_device *bus)
  57 {
  58         struct dev_archdata *bus_sd = &bus->dev.archdata;
  59         struct device_node *bus_dp = bus->dev.of_node;
  60         struct device_node *dp;
  61
  62         for (dp = bus_dp->child; dp; dp = dp->sibling) {
  63                 struct platform_device *op = of_find_device_by_node(dp);
  64
  65                 op->dev.archdata.iommu = bus_sd->iommu;
  66                 op->dev.archdata.stc = bus_sd->stc;
  67                 op->dev.archdata.host_controller = bus_sd->host_controller;
  68                 op->dev.archdata.numa_node = bus_sd->numa_node;
  69
  70                 if (dp->child)
  71                         of_propagate_archdata(op);
  72         }
  73 }
  74
  75 static void get_cells(struct device_node *dp, int *addrc, int *sizec)
  76 {
  77         if (addrc)
  78                 *addrc = of_n_addr_cells(dp);
  79         if (sizec)
  80                 *sizec = of_n_size_cells(dp);
  81 }
  82
  83 /*
  84  * Default translator (generic bus)
  85  */
  86
  87 void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec)
  88 {
  89         get_cells(dev, addrc, sizec);
  90 }
  91
  92 /* Make sure the least significant 64-bits are in-range.  Even
  93  * for 3 or 4 cell values it is a good enough approximation.
  94  */
  95 int of_out_of_range(const u32 *addr, const u32 *base,
  96                     const u32 *size, int na, int ns)
  97 {
  98         u64 a = of_read_addr(addr, na);
  99         u64 b = of_read_addr(base, na);
 100
 101         if (a < b)
 102                 return 1;
 103
 104         b += of_read_addr(size, ns);
 105         if (a >= b)
 106                 return 1;
 107
 108         return 0;
 109 }
 110
 111 int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna)
 112 {
 113         u32 result[OF_MAX_ADDR_CELLS];
 114         int i;
 115
 116         if (ns > 2) {
 117                 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
 118                 return -EINVAL;
 119         }
 120
 121         if (of_out_of_range(addr, range, range + na + pna, na, ns))
 122                 return -EINVAL;
 123
 124         /* Start with the parent range base.  */
 125         memcpy(result, range + na, pna * 4);
 126
 127         /* Add in the child address offset.  */
 128         for (i = 0; i < na; i++)
 129                 result[pna - 1 - i] +=
 130                         (addr[na - 1 - i] -
 131                          range[na - 1 - i]);
 132
 133         memcpy(addr, result, pna * 4);
 134
 135         return 0;
 136 }
 137
 138 unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
 139 {
 140         if (flags)
 141                 return flags;
 142         return IORESOURCE_MEM;
 143 }
 144
 145 /*
 146  * SBUS bus specific translator
 147  */
 148
 149 int of_bus_sbus_match(struct device_node *np)
 150 {
 151         struct device_node *dp = np;
 152
 153         while (dp) {
 154                 if (!strcmp(dp->name, "sbus") ||
 155                     !strcmp(dp->name, "sbi"))
 156                         return 1;
 157
 158                 /* Have a look at use_1to1_mapping().  We're trying
 159                  * to match SBUS if that's the top-level bus and we
 160                  * don't have some intervening real bus that provides
 161                  * ranges based translations.
 162                  */
 163                 if (of_find_property(dp, "ranges", NULL) != NULL)
 164                         break;
 165
 166                 dp = dp->parent;
 167         }
 168
 169         return 0;
 170 }
 171
 172 void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec)
 173 {
 174         if (addrc)
 175                 *addrc = 2;
 176         if (sizec)
 177                 *sizec = 1;
 178 }