diff options
Diffstat (limited to 'drivers/of/base.c')
| -rw-r--r-- | drivers/of/base.c | 205 |
1 files changed, 11 insertions, 194 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index ac6fde53342f..166fb7d75337 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -287,193 +287,6 @@ const void *of_get_property(const struct device_node *np, const char *name, EXPORT_SYMBOL(of_get_property); /** - * of_get_cpu_hwid - Get the hardware ID from a CPU device node - * - * @cpun: CPU number(logical index) for which device node is required - * @thread: The local thread number to get the hardware ID for. - * - * Return: The hardware ID for the CPU node or ~0ULL if not found. - */ -u64 of_get_cpu_hwid(struct device_node *cpun, unsigned int thread) -{ - const __be32 *cell; - int ac, len; - - ac = of_n_addr_cells(cpun); - cell = of_get_property(cpun, "reg", &len); - if (!cell || !ac || ((sizeof(*cell) * ac * (thread + 1)) > len)) - return ~0ULL; - - cell += ac * thread; - return of_read_number(cell, ac); -} - -/* - * arch_match_cpu_phys_id - Match the given logical CPU and physical id - * - * @cpu: logical cpu index of a core/thread - * @phys_id: physical identifier of a core/thread - * - * CPU logical to physical index mapping is architecture specific. - * However this __weak function provides a default match of physical - * id to logical cpu index. phys_id provided here is usually values read - * from the device tree which must match the hardware internal registers. - * - * Returns true if the physical identifier and the logical cpu index - * correspond to the same core/thread, false otherwise. - */ -bool __weak arch_match_cpu_phys_id(int cpu, u64 phys_id) -{ - return (u32)phys_id == cpu; -} - -/* - * Checks if the given "prop_name" property holds the physical id of the - * core/thread corresponding to the logical cpu 'cpu'. If 'thread' is not - * NULL, local thread number within the core is returned in it. - */ -static bool __of_find_n_match_cpu_property(struct device_node *cpun, - const char *prop_name, int cpu, unsigned int *thread) -{ - const __be32 *cell; - int ac, prop_len, tid; - u64 hwid; - - ac = of_n_addr_cells(cpun); - cell = of_get_property(cpun, prop_name, &prop_len); - if (!cell && !ac && arch_match_cpu_phys_id(cpu, 0)) - return true; - if (!cell || !ac) - return false; - prop_len /= sizeof(*cell) * ac; - for (tid = 0; tid < prop_len; tid++) { - hwid = of_read_number(cell, ac); - if (arch_match_cpu_phys_id(cpu, hwid)) { - if (thread) - *thread = tid; - return true; - } - cell += ac; - } - return false; -} - -/* - * arch_find_n_match_cpu_physical_id - See if the given device node is - * for the cpu corresponding to logical cpu 'cpu'. Return true if so, - * else false. If 'thread' is non-NULL, the local thread number within the - * core is returned in it. - */ -bool __weak arch_find_n_match_cpu_physical_id(struct device_node *cpun, - int cpu, unsigned int *thread) -{ - /* Check for non-standard "ibm,ppc-interrupt-server#s" property - * for thread ids on PowerPC. If it doesn't exist fallback to - * standard "reg" property. - */ - if (IS_ENABLED(CONFIG_PPC) && - __of_find_n_match_cpu_property(cpun, - "ibm,ppc-interrupt-server#s", - cpu, thread)) - return true; - - return __of_find_n_match_cpu_property(cpun, "reg", cpu, thread); -} - -/** - * of_get_cpu_node - Get device node associated with the given logical CPU - * - * @cpu: CPU number(logical index) for which device node is required - * @thread: if not NULL, local thread number within the physical core is - * returned - * - * The main purpose of this function is to retrieve the device node for the - * given logical CPU index. It should be used to initialize the of_node in - * cpu device. Once of_node in cpu device is populated, all the further - * references can use that instead. - * - * CPU logical to physical index mapping is architecture specific and is built - * before booting secondary cores. This function uses arch_match_cpu_phys_id - * which can be overridden by architecture specific implementation. - * - * Return: A node pointer for the logical cpu with refcount incremented, use - * of_node_put() on it when done. Returns NULL if not found. - */ -struct device_node *of_get_cpu_node(int cpu, unsigned int *thread) -{ - struct device_node *cpun; - - for_each_of_cpu_node(cpun) { - if (arch_find_n_match_cpu_physical_id(cpun, cpu, thread)) - return cpun; - } - return NULL; -} -EXPORT_SYMBOL(of_get_cpu_node); - -/** - * of_cpu_node_to_id: Get the logical CPU number for a given device_node - * - * @cpu_node: Pointer to the device_node for CPU. - * - * Return: The logical CPU number of the given CPU device_node or -ENODEV if the - * CPU is not found. - */ -int of_cpu_node_to_id(struct device_node *cpu_node) -{ - int cpu; - bool found = false; - struct device_node *np; - - for_each_possible_cpu(cpu) { - np = of_cpu_device_node_get(cpu); - found = (cpu_node == np); - of_node_put(np); - if (found) - return cpu; - } - - return -ENODEV; -} -EXPORT_SYMBOL(of_cpu_node_to_id); - -/** - * of_get_cpu_state_node - Get CPU's idle state node at the given index - * - * @cpu_node: The device node for the CPU - * @index: The index in the list of the idle states - * - * Two generic methods can be used to describe a CPU's idle states, either via - * a flattened description through the "cpu-idle-states" binding or via the - * hierarchical layout, using the "power-domains" and the "domain-idle-states" - * bindings. This function check for both and returns the idle state node for - * the requested index. - * - * Return: An idle state node if found at @index. The refcount is incremented - * for it, so call of_node_put() on it when done. Returns NULL if not found. - */ -struct device_node *of_get_cpu_state_node(struct device_node *cpu_node, - int index) -{ - struct of_phandle_args args; - int err; - - err = of_parse_phandle_with_args(cpu_node, "power-domains", - "#power-domain-cells", 0, &args); - if (!err) { - struct device_node *state_node = - of_parse_phandle(args.np, "domain-idle-states", index); - - of_node_put(args.np); - if (state_node) - return state_node; - } - - return of_parse_phandle(cpu_node, "cpu-idle-states", index); -} -EXPORT_SYMBOL(of_get_cpu_state_node); - -/** * __of_device_is_compatible() - Check if the node matches given constraints * @device: pointer to node * @compat: required compatible string, NULL or "" for any match @@ -1208,19 +1021,23 @@ struct device_node *of_find_matching_node_and_match(struct device_node *from, EXPORT_SYMBOL(of_find_matching_node_and_match); /** - * of_modalias_node - Lookup appropriate modalias for a device node + * of_alias_from_compatible - Lookup appropriate alias for a device node + * depending on compatible * @node: pointer to a device tree node - * @modalias: Pointer to buffer that modalias value will be copied into - * @len: Length of modalias value + * @alias: Pointer to buffer that alias value will be copied into + * @len: Length of alias value * * Based on the value of the compatible property, this routine will attempt - * to choose an appropriate modalias value for a particular device tree node. + * to choose an appropriate alias value for a particular device tree node. * It does this by stripping the manufacturer prefix (as delimited by a ',') * from the first entry in the compatible list property. * + * Note: The matching on just the "product" side of the compatible is a relic + * from I2C and SPI. Please do not add any new user. + * * Return: This routine returns 0 on success, <0 on failure. */ -int of_modalias_node(struct device_node *node, char *modalias, int len) +int of_alias_from_compatible(const struct device_node *node, char *alias, int len) { const char *compatible, *p; int cplen; @@ -1229,10 +1046,10 @@ int of_modalias_node(struct device_node *node, char *modalias, int len) if (!compatible || strlen(compatible) > cplen) return -ENODEV; p = strchr(compatible, ','); - strscpy(modalias, p ? p + 1 : compatible, len); + strscpy(alias, p ? p + 1 : compatible, len); return 0; } -EXPORT_SYMBOL_GPL(of_modalias_node); +EXPORT_SYMBOL_GPL(of_alias_from_compatible); /** * of_find_node_by_phandle - Find a node given a phandle |