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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315// SPDX-License-Identifier: GPL-2.0#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/of_reserved_mem.h>#include <linux/dma-direct.h> /* for bus_dma_region */#include <linux/dma-map-ops.h>#include <linux/init.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 * @matches: array of of_device_id 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 || dev_of_node_reused(dev)) return NULL; return of_match_node(matches, dev->of_node);}EXPORT_SYMBOL(of_match_device);
static voidof_dma_set_restricted_buffer(struct device *dev, struct device_node *np){ struct device_node *of_node = dev->of_node; struct of_phandle_iterator it; int rc, i = 0;
if (!IS_ENABLED(CONFIG_DMA_RESTRICTED_POOL)) return;
/* * If dev->of_node doesn't exist or doesn't contain memory-region, try * the OF node having DMA configuration. */ if (!of_property_present(of_node, "memory-region")) of_node = np;
of_for_each_phandle(&it, rc, of_node, "memory-region", NULL, 0) { /* * There might be multiple memory regions, but only one * restricted-dma-pool region is allowed. */ if (of_device_is_compatible(it.node, "restricted-dma-pool") && of_device_is_available(it.node)) { if (of_reserved_mem_device_init_by_idx(dev, of_node, i)) dev_warn(dev, "failed to initialise \"restricted-dma-pool\" memory node\n"); of_node_put(it.node); break; } i++; }
}
/** * of_dma_configure_id - 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. * @id: Optional const pointer value input id * * 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_id(struct device *dev, struct device_node *np, bool force_dma, const u32 *id){ const struct bus_dma_region *map = NULL; struct device_node *bus_np; u64 mask, end = 0; bool coherent, set_map = false; int ret;
if (dev->dma_range_map) { dev_dbg(dev, "dma_range_map already set\n"); goto skip_map; }
if (np == dev->of_node) bus_np = __of_get_dma_parent(np); else bus_np = of_node_get(np);
ret = of_dma_get_range(bus_np, &map); of_node_put(bus_np); 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; } else { /* Determine the overall bounds of all DMA regions */ end = dma_range_map_max(map); set_map = true; }skip_map: /* * 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 (!end && dev->coherent_dma_mask) end = dev->coherent_dma_mask; else if (!end) end = (1ULL << 32) - 1;
/* * Limit coherent and dma mask based on size and default mask * set by the driver. */ mask = DMA_BIT_MASK(ilog2(end) + 1); dev->coherent_dma_mask &= mask; *dev->dma_mask &= mask; /* ...but only set bus limit and range map if we found valid dma-ranges earlier */ if (set_map) { dev->bus_dma_limit = end; dev->dma_range_map = map; }
coherent = of_dma_is_coherent(np); dev_dbg(dev, "device is%sdma coherent\n", coherent ? " " : " not ");
ret = of_iommu_configure(dev, np, id); if (ret == -EPROBE_DEFER) { /* Don't touch range map if it wasn't set from a valid dma-ranges */ if (set_map) dev->dma_range_map = NULL; kfree(map); return -EPROBE_DEFER; } /* Take all other IOMMU errors to mean we'll just carry on without it */ dev_dbg(dev, "device is%sbehind an iommu\n", !ret ? " " : " not ");
arch_setup_dma_ops(dev, coherent);
if (ret) of_dma_set_restricted_buffer(dev, np);
return 0;}EXPORT_SYMBOL_GPL(of_dma_configure_id);
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);
/** * of_device_modalias - Fill buffer with newline terminated modalias string * @dev: Calling device * @str: Modalias string * @len: Size of @str */ssize_t of_device_modalias(struct device *dev, char *str, ssize_t len){ ssize_t sl;
if (!dev || !dev->of_node || dev_of_node_reused(dev)) return -ENODEV;
sl = of_modalias(dev->of_node, 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 * @dev: Device to display the uevent information for * @env: Kernel object's userspace event reference to fill up */void of_device_uevent(const struct device *dev, struct kobj_uevent_env *env){ const char *compat, *type; struct alias_prop *app; struct property *p; int seen = 0;
if ((!dev) || (!dev->of_node)) return;
add_uevent_var(env, "OF_NAME=%pOFn", dev->of_node); add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node); type = of_node_get_device_type(dev->of_node); if (type) add_uevent_var(env, "OF_TYPE=%s", 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);}EXPORT_SYMBOL_GPL(of_device_uevent);
int of_device_uevent_modalias(const struct device *dev, struct kobj_uevent_env *env){ int sl;
if ((!dev) || (!dev->of_node) || dev_of_node_reused(dev)) return -ENODEV;
/* Devicetree modalias is tricky, we add it in 2 steps */ if (add_uevent_var(env, "MODALIAS=")) return -ENOMEM;
sl = of_modalias(dev->of_node, &env->buf[env->buflen-1], sizeof(env->buf) - env->buflen); if (sl < 0) return sl; if (sl >= (sizeof(env->buf) - env->buflen)) return -ENOMEM; env->buflen += sl;
return 0;}EXPORT_SYMBOL_GPL(of_device_uevent_modalias);
/** * of_device_make_bus_id - Use the device node data to assign a unique name * @dev: pointer to device structure that is linked to a device tree node * * This routine will first try using the translated bus address to * derive a unique name. If it cannot, then it will prepend names from * parent nodes until a unique name can be derived. */void of_device_make_bus_id(struct device *dev){ struct device_node *node = dev->of_node; const __be32 *reg; u64 addr; u32 mask;
/* Construct the name, using parent nodes if necessary to ensure uniqueness */ while (node->parent) { /* * If the address can be translated, then that is as much * uniqueness as we need. Make it the first component and return */ reg = of_get_property(node, "reg", NULL); if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) { if (!of_property_read_u32(node, "mask", &mask)) dev_set_name(dev, dev_name(dev) ? "%llx.%x.%pOFn:%s" : "%llx.%x.%pOFn", addr, ffs(mask) - 1, node, dev_name(dev));
else dev_set_name(dev, dev_name(dev) ? "%llx.%pOFn:%s" : "%llx.%pOFn", addr, node, dev_name(dev)); return; }
/* format arguments only used if dev_name() resolves to NULL */ dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s", kbasename(node->full_name), dev_name(dev)); node = node->parent; }}EXPORT_SYMBOL_GPL(of_device_make_bus_id);