diff options
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/base.c | 84 | ||||
| -rw-r--r-- | drivers/of/fdt.c | 7 | ||||
| -rw-r--r-- | drivers/of/irq.c | 107 | ||||
| -rw-r--r-- | drivers/of/platform.c | 28 |
4 files changed, 213 insertions, 13 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index b970562..9b6588e 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -716,6 +716,90 @@ int of_property_read_string(struct device_node *np, const char *propname, EXPORT_SYMBOL_GPL(of_property_read_string); /** + * of_property_read_string_index - Find and read a string from a multiple + * strings property. + * @np: device node from which the property value is to be read. + * @propname: name of the property to be searched. + * @index: index of the string in the list of strings + * @out_string: pointer to null terminated return string, modified only if + * return value is 0. + * + * Search for a property in a device tree node and retrieve a null + * terminated string value (pointer to data, not a copy) in the list of strings + * contained in that property. + * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if + * property does not have a value, and -EILSEQ if the string is not + * null-terminated within the length of the property data. + * + * The out_string pointer is modified only if a valid string can be decoded. + */ +int of_property_read_string_index(struct device_node *np, const char *propname, + int index, const char **output) +{ + struct property *prop = of_find_property(np, propname, NULL); + int i = 0; + size_t l = 0, total = 0; + const char *p; + + if (!prop) + return -EINVAL; + if (!prop->value) + return -ENODATA; + if (strnlen(prop->value, prop->length) >= prop->length) + return -EILSEQ; + + p = prop->value; + + for (i = 0; total < prop->length; total += l, p += l) { + l = strlen(p) + 1; + if ((*p != 0) && (i++ == index)) { + *output = p; + return 0; + } + } + return -ENODATA; +} +EXPORT_SYMBOL_GPL(of_property_read_string_index); + + +/** + * of_property_count_strings - Find and return the number of strings from a + * multiple strings property. + * @np: device node from which the property value is to be read. + * @propname: name of the property to be searched. + * + * Search for a property in a device tree node and retrieve the number of null + * terminated string contain in it. Returns the number of strings on + * success, -EINVAL if the property does not exist, -ENODATA if property + * does not have a value, and -EILSEQ if the string is not null-terminated + * within the length of the property data. + */ +int of_property_count_strings(struct device_node *np, const char *propname) +{ + struct property *prop = of_find_property(np, propname, NULL); + int i = 0; + size_t l = 0, total = 0; + const char *p; + + if (!prop) + return -EINVAL; + if (!prop->value) + return -ENODATA; + if (strnlen(prop->value, prop->length) >= prop->length) + return -EILSEQ; + + p = prop->value; + + for (i = 0; total < prop->length; total += l, p += l) { + l = strlen(p) + 1; + if (*p != 0) + i++; + } + return i; +} +EXPORT_SYMBOL_GPL(of_property_count_strings); + +/** * of_parse_phandle - Resolve a phandle property to a device_node pointer * @np: Pointer to device node holding phandle property * @phandle_name: Name of property holding a phandle value diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index aeec35b..fd85fa2 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -681,9 +681,14 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, if (p != NULL && l > 0) strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE)); + /* + * CONFIG_CMDLINE is meant to be a default in case nothing else + * managed to set the command line, unless CONFIG_CMDLINE_FORCE + * is set in which case we override whatever was found earlier. + */ #ifdef CONFIG_CMDLINE #ifndef CONFIG_CMDLINE_FORCE - if (p == NULL || l == 0 || (l == 1 && (*p) == 0)) + if (!((char *)data)[0]) #endif strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); #endif /* CONFIG_CMDLINE */ diff --git a/drivers/of/irq.c b/drivers/of/irq.c index 6a5b5e7..6d3dd39 100644 --- a/drivers/of/irq.c +++ b/drivers/of/irq.c @@ -19,10 +19,12 @@ */ #include <linux/errno.h> +#include <linux/list.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_irq.h> #include <linux/string.h> +#include <linux/slab.h> /* For archs that don't support NO_IRQ (such as x86), provide a dummy value */ #ifndef NO_IRQ @@ -386,3 +388,108 @@ int of_irq_to_resource_table(struct device_node *dev, struct resource *res, return i; } + +struct intc_desc { + struct list_head list; + struct device_node *dev; + struct device_node *interrupt_parent; +}; + +/** + * of_irq_init - Scan and init matching interrupt controllers in DT + * @matches: 0 terminated array of nodes to match and init function to call + * + * This function scans the device tree for matching interrupt controller nodes, + * and calls their initialization functions in order with parents first. + */ +void __init of_irq_init(const struct of_device_id *matches) +{ + struct device_node *np, *parent = NULL; + struct intc_desc *desc, *temp_desc; + struct list_head intc_desc_list, intc_parent_list; + + INIT_LIST_HEAD(&intc_desc_list); + INIT_LIST_HEAD(&intc_parent_list); + + for_each_matching_node(np, matches) { + if (!of_find_property(np, "interrupt-controller", NULL)) + continue; + /* + * Here, we allocate and populate an intc_desc with the node + * pointer, interrupt-parent device_node etc. + */ + desc = kzalloc(sizeof(*desc), GFP_KERNEL); + if (WARN_ON(!desc)) + goto err; + + desc->dev = np; + desc->interrupt_parent = of_irq_find_parent(np); + list_add_tail(&desc->list, &intc_desc_list); + } + + /* + * The root irq controller is the one without an interrupt-parent. + * That one goes first, followed by the controllers that reference it, + * followed by the ones that reference the 2nd level controllers, etc. + */ + while (!list_empty(&intc_desc_list)) { + /* + * Process all controllers with the current 'parent'. + * First pass will be looking for NULL as the parent. + * The assumption is that NULL parent means a root controller. + */ + list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { + const struct of_device_id *match; + int ret; + of_irq_init_cb_t irq_init_cb; + + if (desc->interrupt_parent != parent) + continue; + + list_del(&desc->list); + match = of_match_node(matches, desc->dev); + if (WARN(!match->data, + "of_irq_init: no init function for %s\n", + match->compatible)) { + kfree(desc); + continue; + } + + pr_debug("of_irq_init: init %s @ %p, parent %p\n", + match->compatible, + desc->dev, desc->interrupt_parent); + irq_init_cb = match->data; + ret = irq_init_cb(desc->dev, desc->interrupt_parent); + if (ret) { + kfree(desc); + continue; + } + + /* + * This one is now set up; add it to the parent list so + * its children can get processed in a subsequent pass. + */ + list_add_tail(&desc->list, &intc_parent_list); + } + + /* Get the next pending parent that might have children */ + desc = list_first_entry(&intc_parent_list, typeof(*desc), list); + if (list_empty(&intc_parent_list) || !desc) { + pr_err("of_irq_init: children remain, but no parents\n"); + break; + } + list_del(&desc->list); + parent = desc->dev; + kfree(desc); + } + + list_for_each_entry_safe(desc, temp_desc, &intc_parent_list, list) { + list_del(&desc->list); + kfree(desc); + } +err: + list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { + list_del(&desc->list); + kfree(desc); + } +} diff --git a/drivers/of/platform.c b/drivers/of/platform.c index ed5a6d3..cbd5d70 100644 --- a/drivers/of/platform.c +++ b/drivers/of/platform.c @@ -310,18 +310,21 @@ static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *l struct device_node *np) { struct resource res; - if (lookup) { - for(; lookup->name != NULL; lookup++) { - if (!of_device_is_compatible(np, lookup->compatible)) - continue; - if (of_address_to_resource(np, 0, &res)) - continue; - if (res.start != lookup->phys_addr) - continue; - pr_debug("%s: devname=%s\n", np->full_name, lookup->name); - return lookup; - } + + if (!lookup) + return NULL; + + for(; lookup->name != NULL; lookup++) { + if (!of_device_is_compatible(np, lookup->compatible)) + continue; + if (of_address_to_resource(np, 0, &res)) + continue; + if (res.start != lookup->phys_addr) + continue; + pr_debug("%s: devname=%s\n", np->full_name, lookup->name); + return lookup; } + return NULL; } @@ -329,8 +332,9 @@ static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *l * of_platform_bus_create() - Create a device for a node and its children. * @bus: device node of the bus to instantiate * @matches: match table for bus nodes - * disallow recursive creation of child buses + * @lookup: auxdata table for matching id and platform_data with device nodes * @parent: parent for new device, or NULL for top level. + * @strict: require compatible property * * Creates a platform_device for the provided device_node, and optionally * recursively create devices for all the child nodes. |
