arch/sparc/kernel/of_device_common.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #include <linux/string.h>
   3 #include <linux/kernel.h>
   4 #include <linux/of.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_platform.h>
  10 #include <linux/of_address.h>
  11 #include <linux/of_device.h>
  12 #include <linux/of_irq.h>
  13
  14 #include "of_device_common.h"
  15
  16 unsigned int irq_of_parse_and_map(struct device_node *node, int index)
  17 {
  18         struct platform_device *op = of_find_device_by_node(node);
  19
  20         if (!op || index >= op->archdata.num_irqs)
  21                 return 0;
  22
  23         return op->archdata.irqs[index];
  24 }
  25 EXPORT_SYMBOL(irq_of_parse_and_map);
  26
  27 int of_address_to_resource(struct device_node *node, int index,
  28                            struct resource *r)
  29 {
  30         struct platform_device *op = of_find_device_by_node(node);
  31
  32         if (!op || index >= op->num_resources)
  33                 return -EINVAL;
  34
  35         memcpy(r, &op->archdata.resource[index], sizeof(*r));
  36         return 0;
  37 }
  38 EXPORT_SYMBOL_GPL(of_address_to_resource);
  39
  40 void __iomem *of_iomap(struct device_node *node, int index)
  41 {
  42         struct platform_device *op = of_find_device_by_node(node);
  43         struct resource *r;
  44
  45         if (!op || index >= op->num_resources)
  46                 return NULL;
  47
  48         r = &op->archdata.resource[index];
  49
  50         return of_ioremap(r, 0, resource_size(r), (char *) r->name);
  51 }
  52 EXPORT_SYMBOL(of_iomap);
  53
  54 /* Take the archdata values for IOMMU, STC, and HOSTDATA found in
  55  * BUS and propagate to all child platform_device objects.
  56  */
  57 void of_propagate_archdata(struct platform_device *bus)
  58 {
  59         struct dev_archdata *bus_sd = &bus->dev.archdata;
  60         struct device_node *bus_dp = bus->dev.of_node;
  61         struct device_node *dp;
  62
  63         for (dp = bus_dp->child; dp; dp = dp->sibling) {
  64                 struct platform_device *op = of_find_device_by_node(dp);
  65
  66                 op->dev.archdata.iommu = bus_sd->iommu;
  67                 op->dev.archdata.stc = bus_sd->stc;
  68                 op->dev.archdata.host_controller = bus_sd->host_controller;
  69                 op->dev.archdata.numa_node = bus_sd->numa_node;
  70
  71                 if (dp->child)
  72                         of_propagate_archdata(op);
  73         }
  74 }
  75
  76 static void get_cells(struct device_node *dp, int *addrc, int *sizec)
  77 {
  78         if (addrc)
  79                 *addrc = of_n_addr_cells(dp);
  80         if (sizec)
  81                 *sizec = of_n_size_cells(dp);
  82 }
  83
  84 /*
  85  * Default translator (generic bus)
  86  */
  87
  88 void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec)
  89 {
  90         get_cells(dev, addrc, sizec);
  91 }
  92
  93 /* Make sure the least significant 64-bits are in-range.  Even
  94  * for 3 or 4 cell values it is a good enough approximation.
  95  */
  96 int of_out_of_range(const u32 *addr, const u32 *base,
  97                     const u32 *size, int na, int ns)
  98 {
  99         u64 a = of_read_addr(addr, na);
 100         u64 b = of_read_addr(base, na);
 101
 102         if (a < b)
 103                 return 1;
 104
 105         b += of_read_addr(size, ns);
 106         if (a >= b)
 107                 return 1;
 108
 109         return 0;
 110 }
 111
 112 int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna)
 113 {
 114         u32 result[OF_MAX_ADDR_CELLS];
 115         int i;
 116
 117         if (ns > 2) {
 118                 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
 119                 return -EINVAL;
 120         }
 121
 122         if (of_out_of_range(addr, range, range + na + pna, na, ns))
 123                 return -EINVAL;
 124
 125         /* Start with the parent range base.  */
 126         memcpy(result, range + na, pna * 4);
 127
 128         /* Add in the child address offset.  */
 129         for (i = 0; i < na; i++)
 130                 result[pna - 1 - i] +=
 131                         (addr[na - 1 - i] -
 132                          range[na - 1 - i]);
 133
 134         memcpy(addr, result, pna * 4);
 135
 136         return 0;
 137 }
 138
 139 unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
 140 {
 141         if (flags)
 142                 return flags;
 143         return IORESOURCE_MEM;
 144 }
 145
 146 /*
 147  * SBUS bus specific translator
 148  */
 149
 150 int of_bus_sbus_match(struct device_node *np)
 151 {
 152         struct device_node *dp = np;
 153
 154         while (dp) {
 155                 if (of_node_name_eq(dp, "sbus") ||
 156                     of_node_name_eq(dp, "sbi"))
 157                         return 1;
 158
 159                 /* Have a look at use_1to1_mapping().  We're trying
 160                  * to match SBUS if that's the top-level bus and we
 161                  * don't have some intervening real bus that provides
 162                  * ranges based translations.
 163                  */
 164                 if (of_find_property(dp, "ranges", NULL) != NULL)
 165                         break;
 166
 167                 dp = dp->parent;
 168         }
 169
 170         return 0;
 171 }
 172
 173 void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec)
 174 {
 175         if (addrc)
 176                 *addrc = 2;
 177         if (sizec)
 178                 *sizec = 1;
 179 }