mirror of https://gitee.com/openkylin/linux.git
135 lines
3.2 KiB
C
135 lines
3.2 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/of_device.h>
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#include <asm/errno.h>
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#include <asm/dcr.h>
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static void of_device_make_bus_id(struct of_device *dev)
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{
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static atomic_t bus_no_reg_magic;
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struct device_node *node = dev->node;
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const u32 *reg;
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u64 addr;
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int magic;
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/*
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* If it's a DCR based device, use 'd' for native DCRs
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* and 'D' for MMIO DCRs.
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*/
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#ifdef CONFIG_PPC_DCR
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reg = of_get_property(node, "dcr-reg", NULL);
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if (reg) {
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#ifdef CONFIG_PPC_DCR_NATIVE
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dev_set_name(&dev->dev, "d%x.%s", *reg, node->name);
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#else /* CONFIG_PPC_DCR_NATIVE */
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addr = of_translate_dcr_address(node, *reg, NULL);
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if (addr != OF_BAD_ADDR) {
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dev_set_name(&dev->dev, "D%llx.%s",
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(unsigned long long)addr, node->name);
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return;
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}
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#endif /* !CONFIG_PPC_DCR_NATIVE */
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}
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#endif /* CONFIG_PPC_DCR */
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/*
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* For MMIO, get the physical address
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*/
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reg = of_get_property(node, "reg", NULL);
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if (reg) {
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addr = of_translate_address(node, reg);
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if (addr != OF_BAD_ADDR) {
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dev_set_name(&dev->dev, "%llx.%s",
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(unsigned long long)addr, node->name);
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return;
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}
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}
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/*
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* No BusID, use the node name and add a globally incremented
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* counter (and pray...)
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*/
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magic = atomic_add_return(1, &bus_no_reg_magic);
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dev_set_name(&dev->dev, "%s.%d", node->name, magic - 1);
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}
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struct of_device *of_device_alloc(struct device_node *np,
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const char *bus_id,
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struct device *parent)
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{
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struct of_device *dev;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return NULL;
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dev->node = of_node_get(np);
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dev->dev.dma_mask = &dev->dma_mask;
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dev->dev.parent = parent;
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dev->dev.release = of_release_dev;
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dev->dev.archdata.of_node = np;
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if (bus_id)
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dev_set_name(&dev->dev, "%s", bus_id);
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else
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of_device_make_bus_id(dev);
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return dev;
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}
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EXPORT_SYMBOL(of_device_alloc);
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int of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct of_device *ofdev;
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const char *compat;
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int seen = 0, cplen, sl;
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if (!dev)
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return -ENODEV;
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ofdev = to_of_device(dev);
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if (add_uevent_var(env, "OF_NAME=%s", ofdev->node->name))
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return -ENOMEM;
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if (add_uevent_var(env, "OF_TYPE=%s", ofdev->node->type))
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return -ENOMEM;
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/* Since the compatible field can contain pretty much anything
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* it's not really legal to split it out with commas. We split it
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* up using a number of environment variables instead. */
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compat = of_get_property(ofdev->node, "compatible", &cplen);
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while (compat && *compat && cplen > 0) {
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if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat))
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return -ENOMEM;
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sl = strlen (compat) + 1;
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compat += sl;
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cplen -= sl;
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seen++;
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}
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if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))
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return -ENOMEM;
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/* modalias is trickier, we add it in 2 steps */
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if (add_uevent_var(env, "MODALIAS="))
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return -ENOMEM;
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sl = of_device_get_modalias(ofdev, &env->buf[env->buflen-1],
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sizeof(env->buf) - env->buflen);
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if (sl >= (sizeof(env->buf) - env->buflen))
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return -ENOMEM;
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env->buflen += sl;
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return 0;
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}
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EXPORT_SYMBOL(of_device_uevent);
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EXPORT_SYMBOL(of_device_get_modalias);
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