From: Nicolas Saenz Julienne Date: Tue, 12 Jan 2021 12:55:22 +0000 (+0100) Subject: dm: Introduce xxx_get_dma_range() X-Git-Tag: accepted/tizen/6.0/unified/20211220.133120~39 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=cac56301cf1a48bc56b4ebad94846d83b68f5c60;p=platform%2Fkernel%2Fu-boot.git dm: Introduce xxx_get_dma_range() Add the following functions to get a specific device's DMA ranges: - dev_get_dma_range() - ofnode_get_dma_range() - of_get_dma_range() - fdt_get_dma_range() They are specially useful in oder to be able validate a physical address space range into a bus's and to convert addresses from and to address spaces. Change-Id: Ib15b8a346390bf698dbc274f58ae646ba0fd6711 Signed-off-by: Nicolas Saenz Julienne Reviewed-by: Simon Glass Tested-by: Peter Robinson Signed-off-by: Jaehoon Chung --- diff --git a/common/fdt_support.c b/common/fdt_support.c index f6b26d0..5b4cb64 100644 --- a/common/fdt_support.c +++ b/common/fdt_support.c @@ -1302,6 +1302,79 @@ u64 fdt_translate_dma_address(const void *blob, int node_offset, return __of_translate_address(blob, node_offset, in_addr, "dma-ranges"); } +int fdt_get_dma_range(const void *blob, int node, phys_addr_t *cpu, + dma_addr_t *bus, u64 *size) +{ + bool found_dma_ranges = false; + struct of_bus *bus_node; + const fdt32_t *ranges; + int na, ns, pna, pns; + int parent = node; + int ret = 0; + int len; + + /* Find the closest dma-ranges property */ + while (parent >= 0) { + ranges = fdt_getprop(blob, parent, "dma-ranges", &len); + + /* Ignore empty ranges, they imply no translation required */ + if (ranges && len > 0) + break; + + /* Once we find 'dma-ranges', then a missing one is an error */ + if (found_dma_ranges && !ranges) { + ret = -EINVAL; + goto out; + } + + if (ranges) + found_dma_ranges = true; + + parent = fdt_parent_offset(blob, parent); + } + + if (!ranges || parent < 0) { + debug("no dma-ranges found for node %s\n", + fdt_get_name(blob, node, NULL)); + ret = -ENOENT; + goto out; + } + + /* switch to that node */ + node = parent; + parent = fdt_parent_offset(blob, node); + if (parent < 0) { + printf("Found dma-ranges in root node, shoudln't happen\n"); + ret = -EINVAL; + goto out; + } + + /* Get the address sizes both for the bus and its parent */ + bus_node = of_match_bus(blob, node); + bus_node->count_cells(blob, node, &na, &ns); + if (!OF_CHECK_COUNTS(na, ns)) { + printf("%s: Bad cell count for %s\n", __FUNCTION__, + fdt_get_name(blob, node, NULL)); + return -EINVAL; + goto out; + } + + bus_node = of_match_bus(blob, parent); + bus_node->count_cells(blob, parent, &pna, &pns); + if (!OF_CHECK_COUNTS(pna, pns)) { + printf("%s: Bad cell count for %s\n", __FUNCTION__, + fdt_get_name(blob, parent, NULL)); + return -EINVAL; + goto out; + } + + *bus = fdt_read_number(ranges, na); + *cpu = fdt_translate_dma_address(blob, node, ranges + na); + *size = fdt_read_number(ranges + na + pna, ns); +out: + return ret; +} + /** * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and * who's reg property matches a physical cpu address diff --git a/drivers/core/of_addr.c b/drivers/core/of_addr.c index 4e256d9..ff8d93f 100644 --- a/drivers/core/of_addr.c +++ b/drivers/core/of_addr.c @@ -323,6 +323,84 @@ u64 of_translate_dma_address(const struct device_node *dev, const __be32 *in_add return __of_translate_address(dev, in_addr, "dma-ranges"); } +int of_get_dma_range(const struct device_node *dev, phys_addr_t *cpu, + dma_addr_t *bus, u64 *size) +{ + bool found_dma_ranges = false; + struct device_node *parent; + struct of_bus *bus_node; + int na, ns, pna, pns; + const __be32 *ranges; + int ret = 0; + int len; + + /* Find the closest dma-ranges property */ + dev = of_node_get(dev); + while (dev) { + ranges = of_get_property(dev, "dma-ranges", &len); + + /* Ignore empty ranges, they imply no translation required */ + if (ranges && len > 0) + break; + + /* Once we find 'dma-ranges', then a missing one is an error */ + if (found_dma_ranges && !ranges) { + ret = -EINVAL; + goto out; + } + + if (ranges) + found_dma_ranges = true; + + parent = of_get_parent(dev); + of_node_put(dev); + dev = parent; + } + + if (!dev || !ranges) { + debug("no dma-ranges found for node %s\n", + of_node_full_name(dev)); + ret = -ENOENT; + goto out; + } + + /* switch to that node */ + parent = of_get_parent(dev); + if (!parent) { + printf("Found dma-ranges in root node, shoudln't happen\n"); + ret = -EINVAL; + goto out; + } + + /* Get the address sizes both for the bus and its parent */ + bus_node = of_match_bus((struct device_node*)dev); + bus_node->count_cells(dev, &na, &ns); + if (!OF_CHECK_COUNTS(na, ns)) { + printf("Bad cell count for %s\n", of_node_full_name(dev)); + return -EINVAL; + goto out_parent; + } + + bus_node = of_match_bus(parent); + bus_node->count_cells(parent, &pna, &pns); + if (!OF_CHECK_COUNTS(pna, pns)) { + printf("Bad cell count for %s\n", of_node_full_name(parent)); + return -EINVAL; + goto out_parent; + } + + *bus = of_read_number(ranges, na); + *cpu = of_translate_dma_address(dev, ranges + na); + *size = of_read_number(ranges + na + pna, ns); + +out_parent: + of_node_put(parent); +out: + of_node_put(dev); + return ret; +} + + static int __of_address_to_resource(const struct device_node *dev, const __be32 *addrp, u64 size, unsigned int flags, const char *name, struct resource *r) diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c index 297f0a0..d87b79e 100644 --- a/drivers/core/ofnode.c +++ b/drivers/core/ofnode.c @@ -785,6 +785,15 @@ u64 ofnode_translate_dma_address(ofnode node, const fdt32_t *in_addr) return fdt_translate_dma_address(gd->fdt_blob, ofnode_to_offset(node), in_addr); } +int ofnode_get_dma_range(ofnode node, phys_addr_t *cpu, dma_addr_t *bus, u64 *size) +{ + if (ofnode_is_np(node)) + return of_get_dma_range(ofnode_to_np(node), cpu, bus, size); + else + return fdt_get_dma_range(gd->fdt_blob, ofnode_to_offset(node), + cpu, bus, size); +} + int ofnode_device_is_compatible(ofnode node, const char *compat) { if (ofnode_is_np(node)) diff --git a/drivers/core/read.c b/drivers/core/read.c index fb3dcd9..59e0cd4 100644 --- a/drivers/core/read.c +++ b/drivers/core/read.c @@ -300,6 +300,12 @@ u64 dev_translate_dma_address(struct udevice *dev, const fdt32_t *in_addr) return ofnode_translate_dma_address(dev_ofnode(dev), in_addr); } +int dev_get_dma_range(const struct udevice *dev, phys_addr_t *cpu, + dma_addr_t *bus, u64 *size) +{ + return ofnode_get_dma_range(dev_ofnode(dev), cpu, bus, size); +} + int dev_read_alias_highest_id(const char *stem) { if (of_live_active()) diff --git a/include/dm/of_addr.h b/include/dm/of_addr.h index 3fa1ffc..ee21d5c 100644 --- a/include/dm/of_addr.h +++ b/include/dm/of_addr.h @@ -44,6 +44,23 @@ u64 of_translate_address(const struct device_node *no, const __be32 *in_addr); */ u64 of_translate_dma_address(const struct device_node *no, const __be32 *in_addr); + +/** + * of_get_dma_range() - get dma-ranges for a specific DT node + * + * Get DMA ranges for a specifc node, this is useful to perform bus->cpu and + * cpu->bus address translations + * + * @param blob Pointer to device tree blob + * @param node_offset Node DT offset + * @param cpu Pointer to variable storing the range's cpu address + * @param bus Pointer to variable storing the range's bus address + * @param size Pointer to variable storing the range's size + * @return translated DMA address or OF_BAD_ADDR on error + */ +int of_get_dma_range(const struct device_node *dev, phys_addr_t *cpu, + dma_addr_t *bus, u64 *size); + /** * of_get_address() - obtain an address from a node * diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h index 5c4cbf0..763bdcd 100644 --- a/include/dm/ofnode.h +++ b/include/dm/ofnode.h @@ -795,6 +795,22 @@ u64 ofnode_translate_address(ofnode node, const fdt32_t *in_addr); u64 ofnode_translate_dma_address(ofnode node, const fdt32_t *in_addr); /** + * ofnode_get_dma_range() - get dma-ranges for a specific DT node + * + * Get DMA ranges for a specifc node, this is useful to perform bus->cpu and + * cpu->bus address translations + * + * @param blob Pointer to device tree blob + * @param node_offset Node DT offset + * @param cpu Pointer to variable storing the range's cpu address + * @param bus Pointer to variable storing the range's bus address + * @param size Pointer to variable storing the range's size + * @return translated DMA address or OF_BAD_ADDR on error + */ +int ofnode_get_dma_range(ofnode node, phys_addr_t *cpu, dma_addr_t *bus, + u64 *size); + +/** * ofnode_device_is_compatible() - check if the node is compatible with compat * * This allows to check whether the node is comaptible with the compat. diff --git a/include/dm/read.h b/include/dm/read.h index 70ce41b..507bcdf 100644 --- a/include/dm/read.h +++ b/include/dm/read.h @@ -573,6 +573,21 @@ u64 dev_translate_address(struct udevice *dev, const fdt32_t *in_addr); u64 dev_translate_dma_address(struct udevice *dev, const fdt32_t *in_addr); /** + * dev_get_dma_range() - Get a device's DMA constraints + * + * Provide the address bases and size of the linear mapping between the CPU and + * a device's BUS address space. + * + * @dev: device giving the context in which to translate the DMA address + * @cpu: base address for CPU's view of memory + * @bus: base address for BUS's view of memory + * @size: size of the address space + * @return 0 if ok, negative on error + */ +int dev_get_dma_range(const struct udevice *dev, phys_addr_t *cpu, + dma_addr_t *bus, u64 *size); + +/** * dev_read_alias_highest_id - Get highest alias id for the given stem * @stem: Alias stem to be examined * @@ -843,6 +858,12 @@ static inline u64 dev_translate_dma_address(struct udevice *dev, const fdt32_t * return ofnode_translate_dma_address(dev_ofnode(dev), in_addr); } +static inline int dev_get_dma_range(const struct udevice *dev, phys_addr_t *cpu, + dma_addr_t *bus, u64 *size) +{ + return ofnode_get_dma_range(dev_ofnode(dev), cpu, bus, size); +} + static inline int dev_read_alias_highest_id(const char *stem) { return fdtdec_get_alias_highest_id(gd->fdt_blob, stem); diff --git a/include/fdt_support.h b/include/fdt_support.h index dea55ee..8f11092 100644 --- a/include/fdt_support.h +++ b/include/fdt_support.h @@ -244,6 +244,20 @@ u64 fdt_translate_address(const void *blob, int node_offset, u64 fdt_translate_dma_address(const void *blob, int node_offset, const __be32 *in_addr); +/** + * Get DMA ranges for a specifc node, this is useful to perform bus->cpu and + * cpu->bus address translations + * + * @param blob Pointer to device tree blob + * @param node_offset Node DT offset + * @param cpu Pointer to variable storing the range's cpu address + * @param bus Pointer to variable storing the range's bus address + * @param size Pointer to variable storing the range's size + * @return translated DMA address or OF_BAD_ADDR on error + */ +int fdt_get_dma_range(const void *blob, int node_offset, phys_addr_t *cpu, + dma_addr_t *bus, u64 *size); + int fdt_node_offset_by_compat_reg(void *blob, const char *compat, phys_addr_t compat_off); int fdt_alloc_phandle(void *blob);