175 lines
3.7 KiB
C
175 lines
3.7 KiB
C
#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/irq.h>
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#include <linux/of_device.h>
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#include <linux/of_platform.h>
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#include "of_device_common.h"
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static int node_match(struct device *dev, void *data)
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{
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struct of_device *op = to_of_device(dev);
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struct device_node *dp = data;
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return (op->node == dp);
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}
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struct of_device *of_find_device_by_node(struct device_node *dp)
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{
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struct device *dev = bus_find_device(&of_platform_bus_type, NULL,
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dp, node_match);
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if (dev)
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return to_of_device(dev);
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return NULL;
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}
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EXPORT_SYMBOL(of_find_device_by_node);
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unsigned int irq_of_parse_and_map(struct device_node *node, int index)
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{
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struct of_device *op = of_find_device_by_node(node);
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if (!op || index >= op->num_irqs)
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return 0;
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return op->irqs[index];
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}
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EXPORT_SYMBOL(irq_of_parse_and_map);
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/* Take the archdata values for IOMMU, STC, and HOSTDATA found in
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* BUS and propagate to all child of_device objects.
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*/
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void of_propagate_archdata(struct of_device *bus)
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{
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struct dev_archdata *bus_sd = &bus->dev.archdata;
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struct device_node *bus_dp = bus->node;
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struct device_node *dp;
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for (dp = bus_dp->child; dp; dp = dp->sibling) {
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struct of_device *op = of_find_device_by_node(dp);
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op->dev.archdata.iommu = bus_sd->iommu;
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op->dev.archdata.stc = bus_sd->stc;
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op->dev.archdata.host_controller = bus_sd->host_controller;
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op->dev.archdata.numa_node = bus_sd->numa_node;
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if (dp->child)
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of_propagate_archdata(op);
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}
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}
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struct bus_type of_platform_bus_type;
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EXPORT_SYMBOL(of_platform_bus_type);
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static void get_cells(struct device_node *dp, int *addrc, int *sizec)
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{
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if (addrc)
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*addrc = of_n_addr_cells(dp);
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if (sizec)
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*sizec = of_n_size_cells(dp);
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}
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/*
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* Default translator (generic bus)
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*/
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void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec)
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{
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get_cells(dev, addrc, sizec);
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}
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/* Make sure the least significant 64-bits are in-range. Even
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* for 3 or 4 cell values it is a good enough approximation.
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*/
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int of_out_of_range(const u32 *addr, const u32 *base,
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const u32 *size, int na, int ns)
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{
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u64 a = of_read_addr(addr, na);
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u64 b = of_read_addr(base, na);
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if (a < b)
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return 1;
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b += of_read_addr(size, ns);
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if (a >= b)
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return 1;
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return 0;
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}
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int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna)
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{
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u32 result[OF_MAX_ADDR_CELLS];
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int i;
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if (ns > 2) {
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printk("of_device: Cannot handle size cells (%d) > 2.", ns);
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return -EINVAL;
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}
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if (of_out_of_range(addr, range, range + na + pna, na, ns))
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return -EINVAL;
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/* Start with the parent range base. */
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memcpy(result, range + na, pna * 4);
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/* Add in the child address offset. */
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for (i = 0; i < na; i++)
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result[pna - 1 - i] +=
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(addr[na - 1 - i] -
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range[na - 1 - i]);
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memcpy(addr, result, pna * 4);
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return 0;
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}
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unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
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{
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if (flags)
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return flags;
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return IORESOURCE_MEM;
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}
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/*
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* SBUS bus specific translator
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*/
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int of_bus_sbus_match(struct device_node *np)
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{
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struct device_node *dp = np;
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while (dp) {
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if (!strcmp(dp->name, "sbus") ||
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!strcmp(dp->name, "sbi"))
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return 1;
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/* Have a look at use_1to1_mapping(). We're trying
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* to match SBUS if that's the top-level bus and we
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* don't have some intervening real bus that provides
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* ranges based translations.
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*/
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if (of_find_property(dp, "ranges", NULL) != NULL)
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break;
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dp = dp->parent;
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}
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return 0;
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}
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void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec)
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{
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if (addrc)
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*addrc = 2;
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if (sizec)
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*sizec = 1;
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}
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