irq_domain/c6x: Convert c6x to use generic irq_domain support.
The C6X IRQ support was copied almost verbatim from the PowerPC virtual IRQ code. The PowerPC code was used as the basis for generic irq_domain support, so this patch mostly copies what what done to arch/powerpc by Grant Likely in his irq_domain patch series. Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Aurelien Jacquiot <a-jacquiot@ti.com> Cc: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
parent
a18dc81bf5
commit
0bd761e1b6
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@ -12,6 +12,7 @@ config TMS320C6X
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select HAVE_GENERIC_HARDIRQS
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select HAVE_GENERIC_HARDIRQS
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select HAVE_MEMBLOCK
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select HAVE_MEMBLOCK
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select HAVE_SPARSE_IRQ
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select HAVE_SPARSE_IRQ
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select IRQ_DOMAIN
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select OF
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select OF
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select OF_EARLY_FLATTREE
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select OF_EARLY_FLATTREE
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@ -13,6 +13,7 @@
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#ifndef _ASM_C6X_IRQ_H
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#ifndef _ASM_C6X_IRQ_H
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#define _ASM_C6X_IRQ_H
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#define _ASM_C6X_IRQ_H
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#include <linux/irqdomain.h>
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#include <linux/threads.h>
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#include <linux/threads.h>
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#include <linux/list.h>
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#include <linux/list.h>
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#include <linux/radix-tree.h>
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#include <linux/radix-tree.h>
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@ -41,253 +42,9 @@
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/* This number is used when no interrupt has been assigned */
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/* This number is used when no interrupt has been assigned */
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#define NO_IRQ 0
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#define NO_IRQ 0
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/* This type is the placeholder for a hardware interrupt number. It has to
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* be big enough to enclose whatever representation is used by a given
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* platform.
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*/
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typedef unsigned long irq_hw_number_t;
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/* Interrupt controller "host" data structure. This could be defined as a
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* irq domain controller. That is, it handles the mapping between hardware
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* and virtual interrupt numbers for a given interrupt domain. The host
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* structure is generally created by the PIC code for a given PIC instance
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* (though a host can cover more than one PIC if they have a flat number
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* model). It's the host callbacks that are responsible for setting the
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* irq_chip on a given irq_desc after it's been mapped.
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*
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* The host code and data structures are fairly agnostic to the fact that
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* we use an open firmware device-tree. We do have references to struct
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* device_node in two places: in irq_find_host() to find the host matching
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* a given interrupt controller node, and of course as an argument to its
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* counterpart host->ops->match() callback. However, those are treated as
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* generic pointers by the core and the fact that it's actually a device-node
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* pointer is purely a convention between callers and implementation. This
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* code could thus be used on other architectures by replacing those two
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* by some sort of arch-specific void * "token" used to identify interrupt
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* controllers.
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*/
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struct irq_host;
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struct radix_tree_root;
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struct device_node;
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/* Functions below are provided by the host and called whenever a new mapping
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* is created or an old mapping is disposed. The host can then proceed to
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* whatever internal data structures management is required. It also needs
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* to setup the irq_desc when returning from map().
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*/
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struct irq_host_ops {
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/* Match an interrupt controller device node to a host, returns
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* 1 on a match
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*/
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int (*match)(struct irq_host *h, struct device_node *node);
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/* Create or update a mapping between a virtual irq number and a hw
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* irq number. This is called only once for a given mapping.
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*/
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int (*map)(struct irq_host *h, unsigned int virq, irq_hw_number_t hw);
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/* Dispose of such a mapping */
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void (*unmap)(struct irq_host *h, unsigned int virq);
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/* Translate device-tree interrupt specifier from raw format coming
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* from the firmware to a irq_hw_number_t (interrupt line number) and
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* type (sense) that can be passed to set_irq_type(). In the absence
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* of this callback, irq_create_of_mapping() and irq_of_parse_and_map()
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* will return the hw number in the first cell and IRQ_TYPE_NONE for
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* the type (which amount to keeping whatever default value the
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* interrupt controller has for that line)
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*/
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int (*xlate)(struct irq_host *h, struct device_node *ctrler,
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const u32 *intspec, unsigned int intsize,
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irq_hw_number_t *out_hwirq, unsigned int *out_type);
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};
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struct irq_host {
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struct list_head link;
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/* type of reverse mapping technique */
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unsigned int revmap_type;
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#define IRQ_HOST_MAP_PRIORITY 0 /* core priority irqs, get irqs 1..15 */
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#define IRQ_HOST_MAP_NOMAP 1 /* no fast reverse mapping */
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#define IRQ_HOST_MAP_LINEAR 2 /* linear map of interrupts */
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#define IRQ_HOST_MAP_TREE 3 /* radix tree */
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union {
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struct {
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unsigned int size;
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unsigned int *revmap;
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} linear;
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struct radix_tree_root tree;
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} revmap_data;
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struct irq_host_ops *ops;
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void *host_data;
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irq_hw_number_t inval_irq;
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/* Optional device node pointer */
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struct device_node *of_node;
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};
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struct irq_data;
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struct irq_data;
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extern irq_hw_number_t irqd_to_hwirq(struct irq_data *d);
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extern irq_hw_number_t irqd_to_hwirq(struct irq_data *d);
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extern irq_hw_number_t virq_to_hw(unsigned int virq);
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extern irq_hw_number_t virq_to_hw(unsigned int virq);
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extern bool virq_is_host(unsigned int virq, struct irq_host *host);
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/**
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* irq_alloc_host - Allocate a new irq_host data structure
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* @of_node: optional device-tree node of the interrupt controller
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* @revmap_type: type of reverse mapping to use
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* @revmap_arg: for IRQ_HOST_MAP_LINEAR linear only: size of the map
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* @ops: map/unmap host callbacks
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* @inval_irq: provide a hw number in that host space that is always invalid
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*
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* Allocates and initialize and irq_host structure. Note that in the case of
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* IRQ_HOST_MAP_LEGACY, the map() callback will be called before this returns
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* for all legacy interrupts except 0 (which is always the invalid irq for
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* a legacy controller). For a IRQ_HOST_MAP_LINEAR, the map is allocated by
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* this call as well. For a IRQ_HOST_MAP_TREE, the radix tree will be allocated
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* later during boot automatically (the reverse mapping will use the slow path
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* until that happens).
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*/
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extern struct irq_host *irq_alloc_host(struct device_node *of_node,
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unsigned int revmap_type,
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unsigned int revmap_arg,
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struct irq_host_ops *ops,
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irq_hw_number_t inval_irq);
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/**
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* irq_find_host - Locates a host for a given device node
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* @node: device-tree node of the interrupt controller
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*/
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extern struct irq_host *irq_find_host(struct device_node *node);
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/**
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* irq_set_default_host - Set a "default" host
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* @host: default host pointer
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*
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* For convenience, it's possible to set a "default" host that will be used
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* whenever NULL is passed to irq_create_mapping(). It makes life easier for
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* platforms that want to manipulate a few hard coded interrupt numbers that
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* aren't properly represented in the device-tree.
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*/
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extern void irq_set_default_host(struct irq_host *host);
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/**
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* irq_set_virq_count - Set the maximum number of virt irqs
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* @count: number of linux virtual irqs, capped with NR_IRQS
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*
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* This is mainly for use by platforms like iSeries who want to program
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* the virtual irq number in the controller to avoid the reverse mapping
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*/
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extern void irq_set_virq_count(unsigned int count);
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/**
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* irq_create_mapping - Map a hardware interrupt into linux virq space
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* @host: host owning this hardware interrupt or NULL for default host
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* @hwirq: hardware irq number in that host space
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*
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* Only one mapping per hardware interrupt is permitted. Returns a linux
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* virq number.
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* If the sense/trigger is to be specified, set_irq_type() should be called
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* on the number returned from that call.
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*/
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extern unsigned int irq_create_mapping(struct irq_host *host,
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irq_hw_number_t hwirq);
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/**
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* irq_dispose_mapping - Unmap an interrupt
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* @virq: linux virq number of the interrupt to unmap
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*/
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extern void irq_dispose_mapping(unsigned int virq);
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/**
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* irq_find_mapping - Find a linux virq from an hw irq number.
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* @host: host owning this hardware interrupt
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* @hwirq: hardware irq number in that host space
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*
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* This is a slow path, for use by generic code. It's expected that an
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* irq controller implementation directly calls the appropriate low level
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* mapping function.
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*/
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extern unsigned int irq_find_mapping(struct irq_host *host,
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irq_hw_number_t hwirq);
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/**
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* irq_create_direct_mapping - Allocate a virq for direct mapping
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* @host: host to allocate the virq for or NULL for default host
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*
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* This routine is used for irq controllers which can choose the hardware
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* interrupt numbers they generate. In such a case it's simplest to use
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* the linux virq as the hardware interrupt number.
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*/
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extern unsigned int irq_create_direct_mapping(struct irq_host *host);
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/**
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* irq_radix_revmap_insert - Insert a hw irq to linux virq number mapping.
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* @host: host owning this hardware interrupt
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* @virq: linux irq number
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* @hwirq: hardware irq number in that host space
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*
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* This is for use by irq controllers that use a radix tree reverse
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* mapping for fast lookup.
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*/
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extern void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
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irq_hw_number_t hwirq);
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/**
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* irq_radix_revmap_lookup - Find a linux virq from a hw irq number.
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* @host: host owning this hardware interrupt
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* @hwirq: hardware irq number in that host space
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*
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* This is a fast path, for use by irq controller code that uses radix tree
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* revmaps
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*/
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extern unsigned int irq_radix_revmap_lookup(struct irq_host *host,
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irq_hw_number_t hwirq);
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/**
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* irq_linear_revmap - Find a linux virq from a hw irq number.
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* @host: host owning this hardware interrupt
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* @hwirq: hardware irq number in that host space
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*
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* This is a fast path, for use by irq controller code that uses linear
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* revmaps. It does fallback to the slow path if the revmap doesn't exist
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* yet and will create the revmap entry with appropriate locking
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*/
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extern unsigned int irq_linear_revmap(struct irq_host *host,
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irq_hw_number_t hwirq);
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/**
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* irq_alloc_virt - Allocate virtual irq numbers
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* @host: host owning these new virtual irqs
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* @count: number of consecutive numbers to allocate
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* @hint: pass a hint number, the allocator will try to use a 1:1 mapping
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*
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* This is a low level function that is used internally by irq_create_mapping()
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* and that can be used by some irq controllers implementations for things
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* like allocating ranges of numbers for MSIs. The revmaps are left untouched.
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*/
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extern unsigned int irq_alloc_virt(struct irq_host *host,
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unsigned int count,
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unsigned int hint);
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/**
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* irq_free_virt - Free virtual irq numbers
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* @virq: virtual irq number of the first interrupt to free
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* @count: number of interrupts to free
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*
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* This function is the opposite of irq_alloc_virt. It will not clear reverse
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* maps, this should be done previously by unmap'ing the interrupt. In fact,
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* all interrupts covered by the range being freed should have been unmapped
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* prior to calling this.
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*/
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extern void irq_free_virt(unsigned int virq, unsigned int count);
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extern void __init init_pic_c64xplus(void);
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extern void __init init_pic_c64xplus(void);
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@ -73,9 +73,9 @@ asmlinkage void c6x_do_IRQ(unsigned int prio, struct pt_regs *regs)
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set_irq_regs(old_regs);
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set_irq_regs(old_regs);
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}
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}
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static struct irq_host *core_host;
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static struct irq_domain *core_domain;
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static int core_host_map(struct irq_host *h, unsigned int virq,
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static int core_domain_map(struct irq_domain *h, unsigned int virq,
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irq_hw_number_t hw)
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irq_hw_number_t hw)
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{
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{
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if (hw < 4 || hw >= NR_PRIORITY_IRQS)
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if (hw < 4 || hw >= NR_PRIORITY_IRQS)
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@ -86,8 +86,8 @@ static int core_host_map(struct irq_host *h, unsigned int virq,
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return 0;
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return 0;
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}
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}
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static struct irq_host_ops core_host_ops = {
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static struct irq_domain_ops core_domain_ops = {
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.map = core_host_map,
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.map = core_domain_map,
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};
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};
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void __init init_IRQ(void)
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void __init init_IRQ(void)
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np = of_find_compatible_node(NULL, NULL, "ti,c64x+core-pic");
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np = of_find_compatible_node(NULL, NULL, "ti,c64x+core-pic");
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if (np != NULL) {
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if (np != NULL) {
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/* create the core host */
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/* create the core host */
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core_host = irq_alloc_host(np, IRQ_HOST_MAP_PRIORITY, 0,
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core_domain = irq_domain_add_legacy(np, NR_PRIORITY_IRQS,
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&core_host_ops, 0);
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0, 0, &core_domain_ops,
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if (core_host)
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NULL);
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irq_set_default_host(core_host);
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if (core_domain)
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irq_set_default_host(core_domain);
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of_node_put(np);
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of_node_put(np);
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}
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}
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@ -128,601 +129,15 @@ int arch_show_interrupts(struct seq_file *p, int prec)
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return 0;
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return 0;
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}
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}
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/*
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* IRQ controller and virtual interrupts
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*/
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/* The main irq map itself is an array of NR_IRQ entries containing the
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* associate host and irq number. An entry with a host of NULL is free.
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* An entry can be allocated if it's free, the allocator always then sets
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* hwirq first to the host's invalid irq number and then fills ops.
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*/
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struct irq_map_entry {
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irq_hw_number_t hwirq;
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struct irq_host *host;
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};
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static LIST_HEAD(irq_hosts);
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static DEFINE_RAW_SPINLOCK(irq_big_lock);
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static DEFINE_MUTEX(revmap_trees_mutex);
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static struct irq_map_entry irq_map[NR_IRQS];
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static unsigned int irq_virq_count = NR_IRQS;
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static struct irq_host *irq_default_host;
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irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
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irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
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{
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{
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return irq_map[d->irq].hwirq;
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return d->hwirq;
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}
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}
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EXPORT_SYMBOL_GPL(irqd_to_hwirq);
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EXPORT_SYMBOL_GPL(irqd_to_hwirq);
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irq_hw_number_t virq_to_hw(unsigned int virq)
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irq_hw_number_t virq_to_hw(unsigned int virq)
|
||||||
{
|
{
|
||||||
return irq_map[virq].hwirq;
|
struct irq_data *irq_data = irq_get_irq_data(virq);
|
||||||
|
return WARN_ON(!irq_data) ? 0 : irq_data->hwirq;
|
||||||
}
|
}
|
||||||
EXPORT_SYMBOL_GPL(virq_to_hw);
|
EXPORT_SYMBOL_GPL(virq_to_hw);
|
||||||
|
|
||||||
bool virq_is_host(unsigned int virq, struct irq_host *host)
|
|
||||||
{
|
|
||||||
return irq_map[virq].host == host;
|
|
||||||
}
|
|
||||||
EXPORT_SYMBOL_GPL(virq_is_host);
|
|
||||||
|
|
||||||
static int default_irq_host_match(struct irq_host *h, struct device_node *np)
|
|
||||||
{
|
|
||||||
return h->of_node != NULL && h->of_node == np;
|
|
||||||
}
|
|
||||||
|
|
||||||
struct irq_host *irq_alloc_host(struct device_node *of_node,
|
|
||||||
unsigned int revmap_type,
|
|
||||||
unsigned int revmap_arg,
|
|
||||||
struct irq_host_ops *ops,
|
|
||||||
irq_hw_number_t inval_irq)
|
|
||||||
{
|
|
||||||
struct irq_host *host;
|
|
||||||
unsigned int size = sizeof(struct irq_host);
|
|
||||||
unsigned int i;
|
|
||||||
unsigned int *rmap;
|
|
||||||
unsigned long flags;
|
|
||||||
|
|
||||||
/* Allocate structure and revmap table if using linear mapping */
|
|
||||||
if (revmap_type == IRQ_HOST_MAP_LINEAR)
|
|
||||||
size += revmap_arg * sizeof(unsigned int);
|
|
||||||
host = kzalloc(size, GFP_KERNEL);
|
|
||||||
if (host == NULL)
|
|
||||||
return NULL;
|
|
||||||
|
|
||||||
/* Fill structure */
|
|
||||||
host->revmap_type = revmap_type;
|
|
||||||
host->inval_irq = inval_irq;
|
|
||||||
host->ops = ops;
|
|
||||||
host->of_node = of_node_get(of_node);
|
|
||||||
|
|
||||||
if (host->ops->match == NULL)
|
|
||||||
host->ops->match = default_irq_host_match;
|
|
||||||
|
|
||||||
raw_spin_lock_irqsave(&irq_big_lock, flags);
|
|
||||||
|
|
||||||
/* Check for the priority controller. */
|
|
||||||
if (revmap_type == IRQ_HOST_MAP_PRIORITY) {
|
|
||||||
if (irq_map[0].host != NULL) {
|
|
||||||
raw_spin_unlock_irqrestore(&irq_big_lock, flags);
|
|
||||||
of_node_put(host->of_node);
|
|
||||||
kfree(host);
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
irq_map[0].host = host;
|
|
||||||
}
|
|
||||||
|
|
||||||
list_add(&host->link, &irq_hosts);
|
|
||||||
raw_spin_unlock_irqrestore(&irq_big_lock, flags);
|
|
||||||
|
|
||||||
/* Additional setups per revmap type */
|
|
||||||
switch (revmap_type) {
|
|
||||||
case IRQ_HOST_MAP_PRIORITY:
|
|
||||||
/* 0 is always the invalid number for priority */
|
|
||||||
host->inval_irq = 0;
|
|
||||||
/* setup us as the host for all priority interrupts */
|
|
||||||
for (i = 1; i < NR_PRIORITY_IRQS; i++) {
|
|
||||||
irq_map[i].hwirq = i;
|
|
||||||
smp_wmb();
|
|
||||||
irq_map[i].host = host;
|
|
||||||
smp_wmb();
|
|
||||||
|
|
||||||
ops->map(host, i, i);
|
|
||||||
}
|
|
||||||
break;
|
|
||||||
case IRQ_HOST_MAP_LINEAR:
|
|
||||||
rmap = (unsigned int *)(host + 1);
|
|
||||||
for (i = 0; i < revmap_arg; i++)
|
|
||||||
rmap[i] = NO_IRQ;
|
|
||||||
host->revmap_data.linear.size = revmap_arg;
|
|
||||||
smp_wmb();
|
|
||||||
host->revmap_data.linear.revmap = rmap;
|
|
||||||
break;
|
|
||||||
case IRQ_HOST_MAP_TREE:
|
|
||||||
INIT_RADIX_TREE(&host->revmap_data.tree, GFP_KERNEL);
|
|
||||||
break;
|
|
||||||
default:
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
|
|
||||||
pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
|
|
||||||
|
|
||||||
return host;
|
|
||||||
}
|
|
||||||
|
|
||||||
struct irq_host *irq_find_host(struct device_node *node)
|
|
||||||
{
|
|
||||||
struct irq_host *h, *found = NULL;
|
|
||||||
unsigned long flags;
|
|
||||||
|
|
||||||
/* We might want to match the legacy controller last since
|
|
||||||
* it might potentially be set to match all interrupts in
|
|
||||||
* the absence of a device node. This isn't a problem so far
|
|
||||||
* yet though...
|
|
||||||
*/
|
|
||||||
raw_spin_lock_irqsave(&irq_big_lock, flags);
|
|
||||||
list_for_each_entry(h, &irq_hosts, link)
|
|
||||||
if (h->ops->match(h, node)) {
|
|
||||||
found = h;
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
raw_spin_unlock_irqrestore(&irq_big_lock, flags);
|
|
||||||
return found;
|
|
||||||
}
|
|
||||||
EXPORT_SYMBOL_GPL(irq_find_host);
|
|
||||||
|
|
||||||
void irq_set_default_host(struct irq_host *host)
|
|
||||||
{
|
|
||||||
pr_debug("irq: Default host set to @0x%p\n", host);
|
|
||||||
|
|
||||||
irq_default_host = host;
|
|
||||||
}
|
|
||||||
|
|
||||||
void irq_set_virq_count(unsigned int count)
|
|
||||||
{
|
|
||||||
pr_debug("irq: Trying to set virq count to %d\n", count);
|
|
||||||
|
|
||||||
BUG_ON(count < NR_PRIORITY_IRQS);
|
|
||||||
if (count < NR_IRQS)
|
|
||||||
irq_virq_count = count;
|
|
||||||
}
|
|
||||||
|
|
||||||
static int irq_setup_virq(struct irq_host *host, unsigned int virq,
|
|
||||||
irq_hw_number_t hwirq)
|
|
||||||
{
|
|
||||||
int res;
|
|
||||||
|
|
||||||
res = irq_alloc_desc_at(virq, 0);
|
|
||||||
if (res != virq) {
|
|
||||||
pr_debug("irq: -> allocating desc failed\n");
|
|
||||||
goto error;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* map it */
|
|
||||||
smp_wmb();
|
|
||||||
irq_map[virq].hwirq = hwirq;
|
|
||||||
smp_mb();
|
|
||||||
|
|
||||||
if (host->ops->map(host, virq, hwirq)) {
|
|
||||||
pr_debug("irq: -> mapping failed, freeing\n");
|
|
||||||
goto errdesc;
|
|
||||||
}
|
|
||||||
|
|
||||||
irq_clear_status_flags(virq, IRQ_NOREQUEST);
|
|
||||||
|
|
||||||
return 0;
|
|
||||||
|
|
||||||
errdesc:
|
|
||||||
irq_free_descs(virq, 1);
|
|
||||||
error:
|
|
||||||
irq_free_virt(virq, 1);
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
|
|
||||||
unsigned int irq_create_direct_mapping(struct irq_host *host)
|
|
||||||
{
|
|
||||||
unsigned int virq;
|
|
||||||
|
|
||||||
if (host == NULL)
|
|
||||||
host = irq_default_host;
|
|
||||||
|
|
||||||
BUG_ON(host == NULL);
|
|
||||||
WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
|
|
||||||
|
|
||||||
virq = irq_alloc_virt(host, 1, 0);
|
|
||||||
if (virq == NO_IRQ) {
|
|
||||||
pr_debug("irq: create_direct virq allocation failed\n");
|
|
||||||
return NO_IRQ;
|
|
||||||
}
|
|
||||||
|
|
||||||
pr_debug("irq: create_direct obtained virq %d\n", virq);
|
|
||||||
|
|
||||||
if (irq_setup_virq(host, virq, virq))
|
|
||||||
return NO_IRQ;
|
|
||||||
|
|
||||||
return virq;
|
|
||||||
}
|
|
||||||
|
|
||||||
unsigned int irq_create_mapping(struct irq_host *host,
|
|
||||||
irq_hw_number_t hwirq)
|
|
||||||
{
|
|
||||||
unsigned int virq, hint;
|
|
||||||
|
|
||||||
pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
|
|
||||||
|
|
||||||
/* Look for default host if nececssary */
|
|
||||||
if (host == NULL)
|
|
||||||
host = irq_default_host;
|
|
||||||
if (host == NULL) {
|
|
||||||
printk(KERN_WARNING "irq_create_mapping called for"
|
|
||||||
" NULL host, hwirq=%lx\n", hwirq);
|
|
||||||
WARN_ON(1);
|
|
||||||
return NO_IRQ;
|
|
||||||
}
|
|
||||||
pr_debug("irq: -> using host @%p\n", host);
|
|
||||||
|
|
||||||
/* Check if mapping already exists */
|
|
||||||
virq = irq_find_mapping(host, hwirq);
|
|
||||||
if (virq != NO_IRQ) {
|
|
||||||
pr_debug("irq: -> existing mapping on virq %d\n", virq);
|
|
||||||
return virq;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Allocate a virtual interrupt number */
|
|
||||||
hint = hwirq % irq_virq_count;
|
|
||||||
virq = irq_alloc_virt(host, 1, hint);
|
|
||||||
if (virq == NO_IRQ) {
|
|
||||||
pr_debug("irq: -> virq allocation failed\n");
|
|
||||||
return NO_IRQ;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (irq_setup_virq(host, virq, hwirq))
|
|
||||||
return NO_IRQ;
|
|
||||||
|
|
||||||
pr_debug("irq: irq %lu on host %s mapped to virtual irq %u\n",
|
|
||||||
hwirq, host->of_node ? host->of_node->full_name : "null", virq);
|
|
||||||
|
|
||||||
return virq;
|
|
||||||
}
|
|
||||||
EXPORT_SYMBOL_GPL(irq_create_mapping);
|
|
||||||
|
|
||||||
unsigned int irq_create_of_mapping(struct device_node *controller,
|
|
||||||
const u32 *intspec, unsigned int intsize)
|
|
||||||
{
|
|
||||||
struct irq_host *host;
|
|
||||||
irq_hw_number_t hwirq;
|
|
||||||
unsigned int type = IRQ_TYPE_NONE;
|
|
||||||
unsigned int virq;
|
|
||||||
|
|
||||||
if (controller == NULL)
|
|
||||||
host = irq_default_host;
|
|
||||||
else
|
|
||||||
host = irq_find_host(controller);
|
|
||||||
if (host == NULL) {
|
|
||||||
printk(KERN_WARNING "irq: no irq host found for %s !\n",
|
|
||||||
controller->full_name);
|
|
||||||
return NO_IRQ;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* If host has no translation, then we assume interrupt line */
|
|
||||||
if (host->ops->xlate == NULL)
|
|
||||||
hwirq = intspec[0];
|
|
||||||
else {
|
|
||||||
if (host->ops->xlate(host, controller, intspec, intsize,
|
|
||||||
&hwirq, &type))
|
|
||||||
return NO_IRQ;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Create mapping */
|
|
||||||
virq = irq_create_mapping(host, hwirq);
|
|
||||||
if (virq == NO_IRQ)
|
|
||||||
return virq;
|
|
||||||
|
|
||||||
/* Set type if specified and different than the current one */
|
|
||||||
if (type != IRQ_TYPE_NONE &&
|
|
||||||
type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
|
|
||||||
irq_set_irq_type(virq, type);
|
|
||||||
return virq;
|
|
||||||
}
|
|
||||||
EXPORT_SYMBOL_GPL(irq_create_of_mapping);
|
|
||||||
|
|
||||||
void irq_dispose_mapping(unsigned int virq)
|
|
||||||
{
|
|
||||||
struct irq_host *host;
|
|
||||||
irq_hw_number_t hwirq;
|
|
||||||
|
|
||||||
if (virq == NO_IRQ)
|
|
||||||
return;
|
|
||||||
|
|
||||||
/* Never unmap priority interrupts */
|
|
||||||
if (virq < NR_PRIORITY_IRQS)
|
|
||||||
return;
|
|
||||||
|
|
||||||
host = irq_map[virq].host;
|
|
||||||
if (WARN_ON(host == NULL))
|
|
||||||
return;
|
|
||||||
|
|
||||||
irq_set_status_flags(virq, IRQ_NOREQUEST);
|
|
||||||
|
|
||||||
/* remove chip and handler */
|
|
||||||
irq_set_chip_and_handler(virq, NULL, NULL);
|
|
||||||
|
|
||||||
/* Make sure it's completed */
|
|
||||||
synchronize_irq(virq);
|
|
||||||
|
|
||||||
/* Tell the PIC about it */
|
|
||||||
if (host->ops->unmap)
|
|
||||||
host->ops->unmap(host, virq);
|
|
||||||
smp_mb();
|
|
||||||
|
|
||||||
/* Clear reverse map */
|
|
||||||
hwirq = irq_map[virq].hwirq;
|
|
||||||
switch (host->revmap_type) {
|
|
||||||
case IRQ_HOST_MAP_LINEAR:
|
|
||||||
if (hwirq < host->revmap_data.linear.size)
|
|
||||||
host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
|
|
||||||
break;
|
|
||||||
case IRQ_HOST_MAP_TREE:
|
|
||||||
mutex_lock(&revmap_trees_mutex);
|
|
||||||
radix_tree_delete(&host->revmap_data.tree, hwirq);
|
|
||||||
mutex_unlock(&revmap_trees_mutex);
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Destroy map */
|
|
||||||
smp_mb();
|
|
||||||
irq_map[virq].hwirq = host->inval_irq;
|
|
||||||
|
|
||||||
irq_free_descs(virq, 1);
|
|
||||||
/* Free it */
|
|
||||||
irq_free_virt(virq, 1);
|
|
||||||
}
|
|
||||||
EXPORT_SYMBOL_GPL(irq_dispose_mapping);
|
|
||||||
|
|
||||||
unsigned int irq_find_mapping(struct irq_host *host,
|
|
||||||
irq_hw_number_t hwirq)
|
|
||||||
{
|
|
||||||
unsigned int i;
|
|
||||||
unsigned int hint = hwirq % irq_virq_count;
|
|
||||||
|
|
||||||
/* Look for default host if nececssary */
|
|
||||||
if (host == NULL)
|
|
||||||
host = irq_default_host;
|
|
||||||
if (host == NULL)
|
|
||||||
return NO_IRQ;
|
|
||||||
|
|
||||||
/* Slow path does a linear search of the map */
|
|
||||||
i = hint;
|
|
||||||
do {
|
|
||||||
if (irq_map[i].host == host &&
|
|
||||||
irq_map[i].hwirq == hwirq)
|
|
||||||
return i;
|
|
||||||
i++;
|
|
||||||
if (i >= irq_virq_count)
|
|
||||||
i = 4;
|
|
||||||
} while (i != hint);
|
|
||||||
return NO_IRQ;
|
|
||||||
}
|
|
||||||
EXPORT_SYMBOL_GPL(irq_find_mapping);
|
|
||||||
|
|
||||||
unsigned int irq_radix_revmap_lookup(struct irq_host *host,
|
|
||||||
irq_hw_number_t hwirq)
|
|
||||||
{
|
|
||||||
struct irq_map_entry *ptr;
|
|
||||||
unsigned int virq;
|
|
||||||
|
|
||||||
if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_TREE))
|
|
||||||
return irq_find_mapping(host, hwirq);
|
|
||||||
|
|
||||||
/*
|
|
||||||
* The ptr returned references the static global irq_map.
|
|
||||||
* but freeing an irq can delete nodes along the path to
|
|
||||||
* do the lookup via call_rcu.
|
|
||||||
*/
|
|
||||||
rcu_read_lock();
|
|
||||||
ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
|
|
||||||
rcu_read_unlock();
|
|
||||||
|
|
||||||
/*
|
|
||||||
* If found in radix tree, then fine.
|
|
||||||
* Else fallback to linear lookup - this should not happen in practice
|
|
||||||
* as it means that we failed to insert the node in the radix tree.
|
|
||||||
*/
|
|
||||||
if (ptr)
|
|
||||||
virq = ptr - irq_map;
|
|
||||||
else
|
|
||||||
virq = irq_find_mapping(host, hwirq);
|
|
||||||
|
|
||||||
return virq;
|
|
||||||
}
|
|
||||||
|
|
||||||
void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
|
|
||||||
irq_hw_number_t hwirq)
|
|
||||||
{
|
|
||||||
if (WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE))
|
|
||||||
return;
|
|
||||||
|
|
||||||
if (virq != NO_IRQ) {
|
|
||||||
mutex_lock(&revmap_trees_mutex);
|
|
||||||
radix_tree_insert(&host->revmap_data.tree, hwirq,
|
|
||||||
&irq_map[virq]);
|
|
||||||
mutex_unlock(&revmap_trees_mutex);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
unsigned int irq_linear_revmap(struct irq_host *host,
|
|
||||||
irq_hw_number_t hwirq)
|
|
||||||
{
|
|
||||||
unsigned int *revmap;
|
|
||||||
|
|
||||||
if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_LINEAR))
|
|
||||||
return irq_find_mapping(host, hwirq);
|
|
||||||
|
|
||||||
/* Check revmap bounds */
|
|
||||||
if (unlikely(hwirq >= host->revmap_data.linear.size))
|
|
||||||
return irq_find_mapping(host, hwirq);
|
|
||||||
|
|
||||||
/* Check if revmap was allocated */
|
|
||||||
revmap = host->revmap_data.linear.revmap;
|
|
||||||
if (unlikely(revmap == NULL))
|
|
||||||
return irq_find_mapping(host, hwirq);
|
|
||||||
|
|
||||||
/* Fill up revmap with slow path if no mapping found */
|
|
||||||
if (unlikely(revmap[hwirq] == NO_IRQ))
|
|
||||||
revmap[hwirq] = irq_find_mapping(host, hwirq);
|
|
||||||
|
|
||||||
return revmap[hwirq];
|
|
||||||
}
|
|
||||||
|
|
||||||
unsigned int irq_alloc_virt(struct irq_host *host,
|
|
||||||
unsigned int count,
|
|
||||||
unsigned int hint)
|
|
||||||
{
|
|
||||||
unsigned long flags;
|
|
||||||
unsigned int i, j, found = NO_IRQ;
|
|
||||||
|
|
||||||
if (count == 0 || count > (irq_virq_count - NR_PRIORITY_IRQS))
|
|
||||||
return NO_IRQ;
|
|
||||||
|
|
||||||
raw_spin_lock_irqsave(&irq_big_lock, flags);
|
|
||||||
|
|
||||||
/* Use hint for 1 interrupt if any */
|
|
||||||
if (count == 1 && hint >= NR_PRIORITY_IRQS &&
|
|
||||||
hint < irq_virq_count && irq_map[hint].host == NULL) {
|
|
||||||
found = hint;
|
|
||||||
goto hint_found;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Look for count consecutive numbers in the allocatable
|
|
||||||
* (non-legacy) space
|
|
||||||
*/
|
|
||||||
for (i = NR_PRIORITY_IRQS, j = 0; i < irq_virq_count; i++) {
|
|
||||||
if (irq_map[i].host != NULL)
|
|
||||||
j = 0;
|
|
||||||
else
|
|
||||||
j++;
|
|
||||||
|
|
||||||
if (j == count) {
|
|
||||||
found = i - count + 1;
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
if (found == NO_IRQ) {
|
|
||||||
raw_spin_unlock_irqrestore(&irq_big_lock, flags);
|
|
||||||
return NO_IRQ;
|
|
||||||
}
|
|
||||||
hint_found:
|
|
||||||
for (i = found; i < (found + count); i++) {
|
|
||||||
irq_map[i].hwirq = host->inval_irq;
|
|
||||||
smp_wmb();
|
|
||||||
irq_map[i].host = host;
|
|
||||||
}
|
|
||||||
raw_spin_unlock_irqrestore(&irq_big_lock, flags);
|
|
||||||
return found;
|
|
||||||
}
|
|
||||||
|
|
||||||
void irq_free_virt(unsigned int virq, unsigned int count)
|
|
||||||
{
|
|
||||||
unsigned long flags;
|
|
||||||
unsigned int i;
|
|
||||||
|
|
||||||
WARN_ON(virq < NR_PRIORITY_IRQS);
|
|
||||||
WARN_ON(count == 0 || (virq + count) > irq_virq_count);
|
|
||||||
|
|
||||||
if (virq < NR_PRIORITY_IRQS) {
|
|
||||||
if (virq + count < NR_PRIORITY_IRQS)
|
|
||||||
return;
|
|
||||||
count -= NR_PRIORITY_IRQS - virq;
|
|
||||||
virq = NR_PRIORITY_IRQS;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (count > irq_virq_count || virq > irq_virq_count - count) {
|
|
||||||
if (virq > irq_virq_count)
|
|
||||||
return;
|
|
||||||
count = irq_virq_count - virq;
|
|
||||||
}
|
|
||||||
|
|
||||||
raw_spin_lock_irqsave(&irq_big_lock, flags);
|
|
||||||
for (i = virq; i < (virq + count); i++) {
|
|
||||||
struct irq_host *host;
|
|
||||||
|
|
||||||
host = irq_map[i].host;
|
|
||||||
irq_map[i].hwirq = host->inval_irq;
|
|
||||||
smp_wmb();
|
|
||||||
irq_map[i].host = NULL;
|
|
||||||
}
|
|
||||||
raw_spin_unlock_irqrestore(&irq_big_lock, flags);
|
|
||||||
}
|
|
||||||
|
|
||||||
#ifdef CONFIG_VIRQ_DEBUG
|
|
||||||
static int virq_debug_show(struct seq_file *m, void *private)
|
|
||||||
{
|
|
||||||
unsigned long flags;
|
|
||||||
struct irq_desc *desc;
|
|
||||||
const char *p;
|
|
||||||
static const char none[] = "none";
|
|
||||||
void *data;
|
|
||||||
int i;
|
|
||||||
|
|
||||||
seq_printf(m, "%-5s %-7s %-15s %-18s %s\n", "virq", "hwirq",
|
|
||||||
"chip name", "chip data", "host name");
|
|
||||||
|
|
||||||
for (i = 1; i < nr_irqs; i++) {
|
|
||||||
desc = irq_to_desc(i);
|
|
||||||
if (!desc)
|
|
||||||
continue;
|
|
||||||
|
|
||||||
raw_spin_lock_irqsave(&desc->lock, flags);
|
|
||||||
|
|
||||||
if (desc->action && desc->action->handler) {
|
|
||||||
struct irq_chip *chip;
|
|
||||||
|
|
||||||
seq_printf(m, "%5d ", i);
|
|
||||||
seq_printf(m, "0x%05lx ", irq_map[i].hwirq);
|
|
||||||
|
|
||||||
chip = irq_desc_get_chip(desc);
|
|
||||||
if (chip && chip->name)
|
|
||||||
p = chip->name;
|
|
||||||
else
|
|
||||||
p = none;
|
|
||||||
seq_printf(m, "%-15s ", p);
|
|
||||||
|
|
||||||
data = irq_desc_get_chip_data(desc);
|
|
||||||
seq_printf(m, "0x%16p ", data);
|
|
||||||
|
|
||||||
if (irq_map[i].host && irq_map[i].host->of_node)
|
|
||||||
p = irq_map[i].host->of_node->full_name;
|
|
||||||
else
|
|
||||||
p = none;
|
|
||||||
seq_printf(m, "%s\n", p);
|
|
||||||
}
|
|
||||||
|
|
||||||
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
|
||||||
}
|
|
||||||
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
static int virq_debug_open(struct inode *inode, struct file *file)
|
|
||||||
{
|
|
||||||
return single_open(file, virq_debug_show, inode->i_private);
|
|
||||||
}
|
|
||||||
|
|
||||||
static const struct file_operations virq_debug_fops = {
|
|
||||||
.open = virq_debug_open,
|
|
||||||
.read = seq_read,
|
|
||||||
.llseek = seq_lseek,
|
|
||||||
.release = single_release,
|
|
||||||
};
|
|
||||||
|
|
||||||
static int __init irq_debugfs_init(void)
|
|
||||||
{
|
|
||||||
if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
|
|
||||||
NULL, &virq_debug_fops) == NULL)
|
|
||||||
return -ENOMEM;
|
|
||||||
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
device_initcall(irq_debugfs_init);
|
|
||||||
#endif /* CONFIG_VIRQ_DEBUG */
|
|
||||||
|
|
|
@ -48,7 +48,7 @@ struct megamod_regs {
|
||||||
};
|
};
|
||||||
|
|
||||||
struct megamod_pic {
|
struct megamod_pic {
|
||||||
struct irq_host *irqhost;
|
struct irq_domain *irqhost;
|
||||||
struct megamod_regs __iomem *regs;
|
struct megamod_regs __iomem *regs;
|
||||||
raw_spinlock_t lock;
|
raw_spinlock_t lock;
|
||||||
|
|
||||||
|
@ -116,7 +116,7 @@ static void megamod_irq_cascade(unsigned int irq, struct irq_desc *desc)
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
static int megamod_map(struct irq_host *h, unsigned int virq,
|
static int megamod_map(struct irq_domain *h, unsigned int virq,
|
||||||
irq_hw_number_t hw)
|
irq_hw_number_t hw)
|
||||||
{
|
{
|
||||||
struct megamod_pic *pic = h->host_data;
|
struct megamod_pic *pic = h->host_data;
|
||||||
|
@ -136,7 +136,7 @@ static int megamod_map(struct irq_host *h, unsigned int virq,
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
static int megamod_xlate(struct irq_host *h, struct device_node *ct,
|
static int megamod_xlate(struct irq_domain *h, struct device_node *ct,
|
||||||
const u32 *intspec, unsigned int intsize,
|
const u32 *intspec, unsigned int intsize,
|
||||||
irq_hw_number_t *out_hwirq, unsigned int *out_type)
|
irq_hw_number_t *out_hwirq, unsigned int *out_type)
|
||||||
|
|
||||||
|
@ -148,7 +148,7 @@ static int megamod_xlate(struct irq_host *h, struct device_node *ct,
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
static struct irq_host_ops megamod_host_ops = {
|
static struct irq_domain_ops megamod_domain_ops = {
|
||||||
.map = megamod_map,
|
.map = megamod_map,
|
||||||
.xlate = megamod_xlate,
|
.xlate = megamod_xlate,
|
||||||
};
|
};
|
||||||
|
@ -223,9 +223,8 @@ static struct megamod_pic * __init init_megamod_pic(struct device_node *np)
|
||||||
return NULL;
|
return NULL;
|
||||||
}
|
}
|
||||||
|
|
||||||
pic->irqhost = irq_alloc_host(np, IRQ_HOST_MAP_LINEAR,
|
pic->irqhost = irq_domain_add_linear(np, NR_COMBINERS * 32,
|
||||||
NR_COMBINERS * 32, &megamod_host_ops,
|
&megamod_domain_ops, pic);
|
||||||
IRQ_UNMAPPED);
|
|
||||||
if (!pic->irqhost) {
|
if (!pic->irqhost) {
|
||||||
pr_err("%s: Could not alloc host.\n", np->full_name);
|
pr_err("%s: Could not alloc host.\n", np->full_name);
|
||||||
goto error_free;
|
goto error_free;
|
||||||
|
|
Loading…
Reference in New Issue