diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/sh/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/sh/intc.c | 91 |
2 files changed, 99 insertions, 1 deletions
diff --git a/drivers/sh/Kconfig b/drivers/sh/Kconfig index 1dc8b7ae35fb..e01ae42774af 100644 --- a/drivers/sh/Kconfig +++ b/drivers/sh/Kconfig @@ -22,3 +22,12 @@ config INTC_BALANCING vectors. If in doubt, say N. + +config INTC_MAPPING_DEBUG + bool "Expose IRQ to per-controller id mapping via debugfs" + depends on DEBUG_FS + help + This will create a debugfs entry for showing the relationship + between system IRQs and the per-controller id tables. + + If in doubt, say N. diff --git a/drivers/sh/intc.c b/drivers/sh/intc.c index 4e01d65e5edb..a27dcb4254c7 100644 --- a/drivers/sh/intc.c +++ b/drivers/sh/intc.c @@ -30,6 +30,11 @@ #include <linux/topology.h> #include <linux/bitmap.h> #include <linux/cpumask.h> +#include <linux/spinlock.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <linux/radix-tree.h> +#include <linux/mutex.h> #include <asm/sizes.h> #define _INTC_MK(fn, mode, addr_e, addr_d, width, shift) \ @@ -54,9 +59,15 @@ struct intc_window { unsigned long size; }; +struct intc_map_entry { + intc_enum enum_id; + struct intc_desc_int *desc; +}; + struct intc_desc_int { struct list_head list; struct sys_device sysdev; + struct radix_tree_root tree; pm_message_t state; unsigned long *reg; #ifdef CONFIG_SMP @@ -86,7 +97,9 @@ static LIST_HEAD(intc_list); * unused irq_desc positions in the sparse array. */ static DECLARE_BITMAP(intc_irq_map, NR_IRQS); +static struct intc_map_entry intc_irq_xlate[NR_IRQS]; static DEFINE_SPINLOCK(vector_lock); +static DEFINE_MUTEX(irq_xlate_mutex); #ifdef CONFIG_SMP #define IS_SMP(x) x.smp @@ -828,6 +841,26 @@ static unsigned int __init intc_sense_data(struct intc_desc *desc, return 0; } +unsigned int intc_irq_lookup(const char *chipname, intc_enum enum_id) +{ + struct intc_map_entry *ptr; + struct intc_desc_int *d; + unsigned int irq = 0; + + list_for_each_entry(d, &intc_list, list) { + if (strcmp(d->chip.name, chipname) == 0) { + ptr = radix_tree_lookup(&d->tree, enum_id); + if (ptr) { + irq = ptr - intc_irq_xlate; + break; + } + } + } + + return irq; +} +EXPORT_SYMBOL_GPL(intc_irq_lookup); + static void __init intc_register_irq(struct intc_desc *desc, struct intc_desc_int *d, intc_enum enum_id, @@ -837,10 +870,15 @@ static void __init intc_register_irq(struct intc_desc *desc, unsigned int data[2], primary; /* - * Register the IRQ position with the global IRQ map + * Register the IRQ position with the global IRQ map, then insert + * it in to the radix tree. */ set_bit(irq, intc_irq_map); + mutex_lock(&irq_xlate_mutex); + radix_tree_insert(&d->tree, enum_id, &intc_irq_xlate[irq]); + mutex_unlock(&irq_xlate_mutex); + /* * Prefer single interrupt source bitmap over other combinations: * @@ -1082,6 +1120,9 @@ int __init register_intc_controller(struct intc_desc *desc) continue; } + intc_irq_xlate[irq].enum_id = vect->enum_id; + intc_irq_xlate[irq].desc = d; + intc_register_irq(desc, d, vect->enum_id, irq); for (k = i + 1; k < hw->nr_vectors; k++) { @@ -1196,6 +1237,54 @@ static SYSDEV_CLASS_ATTR(userimask, S_IRUSR | S_IWUSR, show_intc_userimask, store_intc_userimask); #endif +#ifdef CONFIG_INTC_MAPPING_DEBUG +static int intc_irq_xlate_debug(struct seq_file *m, void *priv) +{ + int i; + + seq_printf(m, "%-5s %-7s %-15s\n", "irq", "enum", "chip name"); + + for (i = 1; i < nr_irqs; i++) { + struct intc_desc_int *desc = intc_irq_xlate[i].desc; + + if (!desc) + continue; + + seq_printf(m, "%5d ", i); + seq_printf(m, "0x%05x ", intc_irq_xlate[i].enum_id); + seq_printf(m, "%-15s\n", desc->chip.name); + } + + return 0; +} + +static int intc_irq_xlate_open(struct inode *inode, struct file *file) +{ + return single_open(file, intc_irq_xlate_debug, inode->i_private); +} + +static const struct file_operations intc_irq_xlate_fops = { + .open = intc_irq_xlate_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int __init intc_irq_xlate_init(void) +{ + /* + * XXX.. use arch_debugfs_dir here when all of the intc users are + * converted. + */ + if (debugfs_create_file("intc_irq_xlate", S_IRUGO, NULL, NULL, + &intc_irq_xlate_fops) == NULL) + return -ENOMEM; + + return 0; +} +fs_initcall(intc_irq_xlate_init); +#endif + static ssize_t show_intc_name(struct sys_device *dev, struct sysdev_attribute *attr, char *buf) { |