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-rw-r--r--drivers/of/base.c84
-rw-r--r--drivers/of/fdt.c7
-rw-r--r--drivers/of/irq.c107
-rw-r--r--drivers/of/platform.c28
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.
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