mirror of https://gitee.com/openkylin/linux.git
277 lines
6.8 KiB
C
277 lines
6.8 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/of_device.h>
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#include <linux/of_address.h>
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#include <linux/of_iommu.h>
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#include <linux/dma-mapping.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 <asm/errno.h>
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#include "of_private.h"
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/**
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* of_match_device - Tell if a struct device matches an of_device_id list
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* @ids: array of of device match structures to search in
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* @dev: the of device structure to match against
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*
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* Used by a driver to check whether an platform_device present in the
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* system is in its list of supported devices.
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*/
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const struct of_device_id *of_match_device(const struct of_device_id *matches,
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const struct device *dev)
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{
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if ((!matches) || (!dev->of_node))
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return NULL;
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return of_match_node(matches, dev->of_node);
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}
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EXPORT_SYMBOL(of_match_device);
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struct platform_device *of_dev_get(struct platform_device *dev)
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{
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struct device *tmp;
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if (!dev)
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return NULL;
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tmp = get_device(&dev->dev);
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if (tmp)
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return to_platform_device(tmp);
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else
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return NULL;
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}
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EXPORT_SYMBOL(of_dev_get);
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void of_dev_put(struct platform_device *dev)
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{
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if (dev)
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put_device(&dev->dev);
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}
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EXPORT_SYMBOL(of_dev_put);
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int of_device_add(struct platform_device *ofdev)
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{
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BUG_ON(ofdev->dev.of_node == NULL);
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/* name and id have to be set so that the platform bus doesn't get
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* confused on matching */
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ofdev->name = dev_name(&ofdev->dev);
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ofdev->id = -1;
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/* device_add will assume that this device is on the same node as
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* the parent. If there is no parent defined, set the node
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* explicitly */
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if (!ofdev->dev.parent)
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set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
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return device_add(&ofdev->dev);
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}
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/**
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* of_dma_configure - Setup DMA configuration
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* @dev: Device to apply DMA configuration
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* @np: Pointer to OF node having DMA configuration
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*
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* Try to get devices's DMA configuration from DT and update it
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* accordingly.
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*
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* If platform code needs to use its own special DMA configuration, it
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* can use a platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE events
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* to fix up DMA configuration.
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*/
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void of_dma_configure(struct device *dev, struct device_node *np)
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{
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u64 dma_addr, paddr, size;
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int ret;
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bool coherent;
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unsigned long offset;
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struct iommu_ops *iommu;
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/*
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* Set default coherent_dma_mask to 32 bit. Drivers are expected to
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* setup the correct supported mask.
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*/
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if (!dev->coherent_dma_mask)
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dev->coherent_dma_mask = DMA_BIT_MASK(32);
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/*
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* Set it to coherent_dma_mask by default if the architecture
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* code has not set it.
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*/
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if (!dev->dma_mask)
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dev->dma_mask = &dev->coherent_dma_mask;
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ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
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if (ret < 0) {
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dma_addr = offset = 0;
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size = dev->coherent_dma_mask + 1;
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} else {
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offset = PFN_DOWN(paddr - dma_addr);
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/*
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* Add a work around to treat the size as mask + 1 in case
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* it is defined in DT as a mask.
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*/
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if (size & 1) {
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dev_warn(dev, "Invalid size 0x%llx for dma-range\n",
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size);
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size = size + 1;
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}
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if (!size) {
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dev_err(dev, "Adjusted size 0x%llx invalid\n", size);
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return;
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}
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dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset);
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}
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dev->dma_pfn_offset = offset;
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/*
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* Limit coherent and dma mask based on size and default mask
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* set by the driver.
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*/
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dev->coherent_dma_mask = min(dev->coherent_dma_mask,
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DMA_BIT_MASK(ilog2(dma_addr + size)));
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*dev->dma_mask = min((*dev->dma_mask),
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DMA_BIT_MASK(ilog2(dma_addr + size)));
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coherent = of_dma_is_coherent(np);
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dev_dbg(dev, "device is%sdma coherent\n",
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coherent ? " " : " not ");
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iommu = of_iommu_configure(dev, np);
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dev_dbg(dev, "device is%sbehind an iommu\n",
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iommu ? " " : " not ");
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arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent);
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}
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EXPORT_SYMBOL_GPL(of_dma_configure);
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int of_device_register(struct platform_device *pdev)
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{
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device_initialize(&pdev->dev);
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return of_device_add(pdev);
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}
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EXPORT_SYMBOL(of_device_register);
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void of_device_unregister(struct platform_device *ofdev)
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{
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device_unregister(&ofdev->dev);
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}
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EXPORT_SYMBOL(of_device_unregister);
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ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
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{
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const char *compat;
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int cplen, i;
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ssize_t tsize, csize, repend;
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if ((!dev) || (!dev->of_node))
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return -ENODEV;
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/* Name & Type */
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csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,
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dev->of_node->type);
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/* Get compatible property if any */
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compat = of_get_property(dev->of_node, "compatible", &cplen);
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if (!compat)
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return csize;
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/* Find true end (we tolerate multiple \0 at the end */
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for (i = (cplen - 1); i >= 0 && !compat[i]; i--)
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cplen--;
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if (!cplen)
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return csize;
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cplen++;
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/* Check space (need cplen+1 chars including final \0) */
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tsize = csize + cplen;
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repend = tsize;
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if (csize >= len) /* @ the limit, all is already filled */
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return tsize;
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if (tsize >= len) { /* limit compat list */
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cplen = len - csize - 1;
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repend = len;
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}
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/* Copy and do char replacement */
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memcpy(&str[csize + 1], compat, cplen);
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for (i = csize; i < repend; i++) {
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char c = str[i];
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if (c == '\0')
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str[i] = 'C';
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else if (c == ' ')
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str[i] = '_';
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}
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return tsize;
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}
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/**
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* of_device_uevent - Display OF related uevent information
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*/
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void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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const char *compat;
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struct alias_prop *app;
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int seen = 0, cplen, sl;
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if ((!dev) || (!dev->of_node))
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return;
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add_uevent_var(env, "OF_NAME=%s", dev->of_node->name);
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add_uevent_var(env, "OF_FULLNAME=%s", dev->of_node->full_name);
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if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0)
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add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type);
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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(dev->of_node, "compatible", &cplen);
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while (compat && *compat && cplen > 0) {
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add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
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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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add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
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seen = 0;
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mutex_lock(&of_mutex);
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list_for_each_entry(app, &aliases_lookup, link) {
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if (dev->of_node == app->np) {
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add_uevent_var(env, "OF_ALIAS_%d=%s", seen,
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app->alias);
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seen++;
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}
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}
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mutex_unlock(&of_mutex);
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}
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int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
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{
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int sl;
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if ((!dev) || (!dev->of_node))
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return -ENODEV;
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/* Devicetree modalias is tricky, 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(dev, &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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