4d8bde883b
Now that we can track upstream DMA constraints properly with bus_dma_mask instead of trying (and failing) to maintain it in coherent_dma_mask, it doesn't make much sense for the firmware code to be touching the latter at all. It's merely papering over bugs wherein a driver has failed to call dma_set_coherent_mask() *and* the bus code has not initialised any default value. We don't really want to encourage more drivers coercing dma_mask so we'll continue to fix that up if necessary, but add a warning to help flush out any such buggy bus code that remains. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Christoph Hellwig <hch@lst.de>
346 lines
8.3 KiB
C
346 lines
8.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_iommu.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <asm/errno.h>
|
|
#include "of_private.h"
|
|
|
|
/**
|
|
* of_match_device - Tell if a struct device matches an of_device_id list
|
|
* @ids: array of of device match structures to search in
|
|
* @dev: the of device structure to match against
|
|
*
|
|
* Used by a driver to check whether an platform_device present in the
|
|
* system is in its list of supported devices.
|
|
*/
|
|
const struct of_device_id *of_match_device(const struct of_device_id *matches,
|
|
const struct device *dev)
|
|
{
|
|
if ((!matches) || (!dev->of_node))
|
|
return NULL;
|
|
return of_match_node(matches, dev->of_node);
|
|
}
|
|
EXPORT_SYMBOL(of_match_device);
|
|
|
|
struct platform_device *of_dev_get(struct platform_device *dev)
|
|
{
|
|
struct device *tmp;
|
|
|
|
if (!dev)
|
|
return NULL;
|
|
tmp = get_device(&dev->dev);
|
|
if (tmp)
|
|
return to_platform_device(tmp);
|
|
else
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(of_dev_get);
|
|
|
|
void of_dev_put(struct platform_device *dev)
|
|
{
|
|
if (dev)
|
|
put_device(&dev->dev);
|
|
}
|
|
EXPORT_SYMBOL(of_dev_put);
|
|
|
|
int of_device_add(struct platform_device *ofdev)
|
|
{
|
|
BUG_ON(ofdev->dev.of_node == NULL);
|
|
|
|
/* name and id have to be set so that the platform bus doesn't get
|
|
* confused on matching */
|
|
ofdev->name = dev_name(&ofdev->dev);
|
|
ofdev->id = PLATFORM_DEVID_NONE;
|
|
|
|
/*
|
|
* If this device has not binding numa node in devicetree, that is
|
|
* of_node_to_nid returns NUMA_NO_NODE. device_add will assume that this
|
|
* device is on the same node as the parent.
|
|
*/
|
|
set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
|
|
|
|
return device_add(&ofdev->dev);
|
|
}
|
|
|
|
/**
|
|
* of_dma_configure - Setup DMA configuration
|
|
* @dev: Device to apply DMA configuration
|
|
* @np: Pointer to OF node having DMA configuration
|
|
* @force_dma: Whether device is to be set up by of_dma_configure() even if
|
|
* DMA capability is not explicitly described by firmware.
|
|
*
|
|
* Try to get devices's DMA configuration from DT and update it
|
|
* accordingly.
|
|
*
|
|
* If platform code needs to use its own special DMA configuration, it
|
|
* can use a platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE events
|
|
* to fix up DMA configuration.
|
|
*/
|
|
int of_dma_configure(struct device *dev, struct device_node *np, bool force_dma)
|
|
{
|
|
u64 dma_addr, paddr, size = 0;
|
|
int ret;
|
|
bool coherent;
|
|
unsigned long offset;
|
|
const struct iommu_ops *iommu;
|
|
u64 mask;
|
|
|
|
ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
|
|
if (ret < 0) {
|
|
/*
|
|
* For legacy reasons, we have to assume some devices need
|
|
* DMA configuration regardless of whether "dma-ranges" is
|
|
* correctly specified or not.
|
|
*/
|
|
if (!force_dma)
|
|
return ret == -ENODEV ? 0 : ret;
|
|
|
|
dma_addr = offset = 0;
|
|
} else {
|
|
offset = PFN_DOWN(paddr - dma_addr);
|
|
|
|
/*
|
|
* Add a work around to treat the size as mask + 1 in case
|
|
* it is defined in DT as a mask.
|
|
*/
|
|
if (size & 1) {
|
|
dev_warn(dev, "Invalid size 0x%llx for dma-range\n",
|
|
size);
|
|
size = size + 1;
|
|
}
|
|
|
|
if (!size) {
|
|
dev_err(dev, "Adjusted size 0x%llx invalid\n", size);
|
|
return -EINVAL;
|
|
}
|
|
dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset);
|
|
}
|
|
|
|
/*
|
|
* If @dev is expected to be DMA-capable then the bus code that created
|
|
* it should have initialised its dma_mask pointer by this point. For
|
|
* now, we'll continue the legacy behaviour of coercing it to the
|
|
* coherent mask if not, but we'll no longer do so quietly.
|
|
*/
|
|
if (!dev->dma_mask) {
|
|
dev_warn(dev, "DMA mask not set\n");
|
|
dev->dma_mask = &dev->coherent_dma_mask;
|
|
}
|
|
|
|
if (!size && dev->coherent_dma_mask)
|
|
size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
|
|
else if (!size)
|
|
size = 1ULL << 32;
|
|
|
|
dev->dma_pfn_offset = offset;
|
|
|
|
/*
|
|
* Limit coherent and dma mask based on size and default mask
|
|
* set by the driver.
|
|
*/
|
|
mask = DMA_BIT_MASK(ilog2(dma_addr + size - 1) + 1);
|
|
dev->bus_dma_mask = mask;
|
|
dev->coherent_dma_mask &= mask;
|
|
*dev->dma_mask &= mask;
|
|
|
|
coherent = of_dma_is_coherent(np);
|
|
dev_dbg(dev, "device is%sdma coherent\n",
|
|
coherent ? " " : " not ");
|
|
|
|
iommu = of_iommu_configure(dev, np);
|
|
if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
|
|
return -EPROBE_DEFER;
|
|
|
|
dev_dbg(dev, "device is%sbehind an iommu\n",
|
|
iommu ? " " : " not ");
|
|
|
|
arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_dma_configure);
|
|
|
|
/**
|
|
* of_dma_deconfigure - Clean up DMA configuration
|
|
* @dev: Device for which to clean up DMA configuration
|
|
*
|
|
* Clean up all configuration performed by of_dma_configure_ops() and free all
|
|
* resources that have been allocated.
|
|
*/
|
|
void of_dma_deconfigure(struct device *dev)
|
|
{
|
|
arch_teardown_dma_ops(dev);
|
|
}
|
|
|
|
int of_device_register(struct platform_device *pdev)
|
|
{
|
|
device_initialize(&pdev->dev);
|
|
return of_device_add(pdev);
|
|
}
|
|
EXPORT_SYMBOL(of_device_register);
|
|
|
|
void of_device_unregister(struct platform_device *ofdev)
|
|
{
|
|
device_unregister(&ofdev->dev);
|
|
}
|
|
EXPORT_SYMBOL(of_device_unregister);
|
|
|
|
const void *of_device_get_match_data(const struct device *dev)
|
|
{
|
|
const struct of_device_id *match;
|
|
|
|
match = of_match_device(dev->driver->of_match_table, dev);
|
|
if (!match)
|
|
return NULL;
|
|
|
|
return match->data;
|
|
}
|
|
EXPORT_SYMBOL(of_device_get_match_data);
|
|
|
|
static ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
|
|
{
|
|
const char *compat;
|
|
char *c;
|
|
struct property *p;
|
|
ssize_t csize;
|
|
ssize_t tsize;
|
|
|
|
if ((!dev) || (!dev->of_node))
|
|
return -ENODEV;
|
|
|
|
/* Name & Type */
|
|
csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,
|
|
dev->of_node->type);
|
|
tsize = csize;
|
|
len -= csize;
|
|
if (str)
|
|
str += csize;
|
|
|
|
of_property_for_each_string(dev->of_node, "compatible", p, compat) {
|
|
csize = strlen(compat) + 1;
|
|
tsize += csize;
|
|
if (csize > len)
|
|
continue;
|
|
|
|
csize = snprintf(str, len, "C%s", compat);
|
|
for (c = str; c; ) {
|
|
c = strchr(c, ' ');
|
|
if (c)
|
|
*c++ = '_';
|
|
}
|
|
len -= csize;
|
|
str += csize;
|
|
}
|
|
|
|
return tsize;
|
|
}
|
|
|
|
int of_device_request_module(struct device *dev)
|
|
{
|
|
char *str;
|
|
ssize_t size;
|
|
int ret;
|
|
|
|
size = of_device_get_modalias(dev, NULL, 0);
|
|
if (size < 0)
|
|
return size;
|
|
|
|
str = kmalloc(size + 1, GFP_KERNEL);
|
|
if (!str)
|
|
return -ENOMEM;
|
|
|
|
of_device_get_modalias(dev, str, size);
|
|
str[size] = '\0';
|
|
ret = request_module(str);
|
|
kfree(str);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_device_request_module);
|
|
|
|
/**
|
|
* of_device_modalias - Fill buffer with newline terminated modalias string
|
|
*/
|
|
ssize_t of_device_modalias(struct device *dev, char *str, ssize_t len)
|
|
{
|
|
ssize_t sl = of_device_get_modalias(dev, str, len - 2);
|
|
if (sl < 0)
|
|
return sl;
|
|
if (sl > len - 2)
|
|
return -ENOMEM;
|
|
|
|
str[sl++] = '\n';
|
|
str[sl] = 0;
|
|
return sl;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_device_modalias);
|
|
|
|
/**
|
|
* of_device_uevent - Display OF related uevent information
|
|
*/
|
|
void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
const char *compat;
|
|
struct alias_prop *app;
|
|
struct property *p;
|
|
int seen = 0;
|
|
|
|
if ((!dev) || (!dev->of_node))
|
|
return;
|
|
|
|
add_uevent_var(env, "OF_NAME=%s", dev->of_node->name);
|
|
add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node);
|
|
if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0)
|
|
add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type);
|
|
|
|
/* Since the compatible field can contain pretty much anything
|
|
* it's not really legal to split it out with commas. We split it
|
|
* up using a number of environment variables instead. */
|
|
of_property_for_each_string(dev->of_node, "compatible", p, compat) {
|
|
add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
|
|
seen++;
|
|
}
|
|
add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
|
|
|
|
seen = 0;
|
|
mutex_lock(&of_mutex);
|
|
list_for_each_entry(app, &aliases_lookup, link) {
|
|
if (dev->of_node == app->np) {
|
|
add_uevent_var(env, "OF_ALIAS_%d=%s", seen,
|
|
app->alias);
|
|
seen++;
|
|
}
|
|
}
|
|
mutex_unlock(&of_mutex);
|
|
}
|
|
|
|
int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
int sl;
|
|
|
|
if ((!dev) || (!dev->of_node))
|
|
return -ENODEV;
|
|
|
|
/* Devicetree modalias is tricky, we add it in 2 steps */
|
|
if (add_uevent_var(env, "MODALIAS="))
|
|
return -ENOMEM;
|
|
|
|
sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],
|
|
sizeof(env->buf) - env->buflen);
|
|
if (sl >= (sizeof(env->buf) - env->buflen))
|
|
return -ENOMEM;
|
|
env->buflen += sl;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_device_uevent_modalias);
|