blob: 5089deb8fec3f0fcf744d1647eea5475202555a1 [file] [log] [blame]
#ifdef __KERNEL__
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
#include <linux/threads.h>
#include <linux/list.h>
#include <linux/radix-tree.h>
#include <asm/types.h>
#include <asm/atomic.h>
#define get_irq_desc(irq) (&irq_desc[(irq)])
/* Define a way to iterate across irqs. */
#define for_each_irq(i) \
for ((i) = 0; (i) < NR_IRQS; ++(i))
extern atomic_t ppc_n_lost_interrupts;
/* This number is used when no interrupt has been assigned */
#define NO_IRQ (0)
/* This is a special irq number to return from get_irq() to tell that
* no interrupt happened _and_ ignore it (don't count it as bad). Some
* platforms like iSeries rely on that.
#define NO_IRQ_IGNORE ((unsigned int)-1)
/* Total number of virq in the platform (make it a CONFIG_* option ? */
#define NR_IRQS 512
/* Number of irqs reserved for the legacy controller */
/* This type is the placeholder for a hardware interrupt number. It has to
* be big enough to enclose whatever representation is used by a given
* platform.
typedef unsigned long irq_hw_number_t;
/* Interrupt controller "host" data structure. This could be defined as a
* irq domain controller. That is, it handles the mapping between hardware
* and virtual interrupt numbers for a given interrupt domain. The host
* structure is generally created by the PIC code for a given PIC instance
* (though a host can cover more than one PIC if they have a flat number
* model). It's the host callbacks that are responsible for setting the
* irq_chip on a given irq_desc after it's been mapped.
* The host code and data structures are fairly agnostic to the fact that
* we use an open firmware device-tree. We do have references to struct
* device_node in two places: in irq_find_host() to find the host matching
* a given interrupt controller node, and of course as an argument to its
* counterpart host->ops->match() callback. However, those are treated as
* generic pointers by the core and the fact that it's actually a device-node
* pointer is purely a convention between callers and implementation. This
* code could thus be used on other architectures by replacing those two
* by some sort of arch-specific void * "token" used to identify interrupt
* controllers.
struct irq_host;
struct radix_tree_root;
/* Functions below are provided by the host and called whenever a new mapping
* is created or an old mapping is disposed. The host can then proceed to
* whatever internal data structures management is required. It also needs
* to setup the irq_desc when returning from map().
struct irq_host_ops {
/* Match an interrupt controller device node to a host, returns
* 1 on a match
int (*match)(struct irq_host *h, struct device_node *node);
/* Create or update a mapping between a virtual irq number and a hw
* irq number. This is called only once for a given mapping.
int (*map)(struct irq_host *h, unsigned int virq, irq_hw_number_t hw);
/* Dispose of such a mapping */
void (*unmap)(struct irq_host *h, unsigned int virq);
/* Update of such a mapping */
void (*remap)(struct irq_host *h, unsigned int virq, irq_hw_number_t hw);
/* Translate device-tree interrupt specifier from raw format coming
* from the firmware to a irq_hw_number_t (interrupt line number) and
* type (sense) that can be passed to set_irq_type(). In the absence
* of this callback, irq_create_of_mapping() and irq_of_parse_and_map()
* will return the hw number in the first cell and IRQ_TYPE_NONE for
* the type (which amount to keeping whatever default value the
* interrupt controller has for that line)
int (*xlate)(struct irq_host *h, struct device_node *ctrler,
u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq, unsigned int *out_type);
struct irq_host {
struct list_head link;
/* type of reverse mapping technique */
unsigned int revmap_type;
#define IRQ_HOST_MAP_LEGACY 0 /* legacy 8259, gets irqs 1..15 */
#define IRQ_HOST_MAP_NOMAP 1 /* no fast reverse mapping */
#define IRQ_HOST_MAP_LINEAR 2 /* linear map of interrupts */
#define IRQ_HOST_MAP_TREE 3 /* radix tree */
union {
struct {
unsigned int size;
unsigned int *revmap;
} linear;
struct radix_tree_root tree;
} revmap_data;
struct irq_host_ops *ops;
void *host_data;
irq_hw_number_t inval_irq;
/* Optional device node pointer */
struct device_node *of_node;
/* The main irq map itself is an array of NR_IRQ entries containing the
* associate host and irq number. An entry with a host of NULL is free.
* An entry can be allocated if it's free, the allocator always then sets
* hwirq first to the host's invalid irq number and then fills ops.
struct irq_map_entry {
irq_hw_number_t hwirq;
struct irq_host *host;
extern struct irq_map_entry irq_map[NR_IRQS];
extern irq_hw_number_t virq_to_hw(unsigned int virq);
* irq_alloc_host - Allocate a new irq_host data structure
* @of_node: optional device-tree node of the interrupt controller
* @revmap_type: type of reverse mapping to use
* @revmap_arg: for IRQ_HOST_MAP_LINEAR linear only: size of the map
* @ops: map/unmap host callbacks
* @inval_irq: provide a hw number in that host space that is always invalid
* Allocates and initialize and irq_host structure. Note that in the case of
* IRQ_HOST_MAP_LEGACY, the map() callback will be called before this returns
* for all legacy interrupts except 0 (which is always the invalid irq for
* a legacy controller). For a IRQ_HOST_MAP_LINEAR, the map is allocated by
* this call as well. For a IRQ_HOST_MAP_TREE, the radix tree will be allocated
* later during boot automatically (the reverse mapping will use the slow path
* until that happens).
extern 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);
* irq_find_host - Locates a host for a given device node
* @node: device-tree node of the interrupt controller
extern struct irq_host *irq_find_host(struct device_node *node);
* irq_set_default_host - Set a "default" host
* @host: default host pointer
* For convenience, it's possible to set a "default" host that will be used
* whenever NULL is passed to irq_create_mapping(). It makes life easier for
* platforms that want to manipulate a few hard coded interrupt numbers that
* aren't properly represented in the device-tree.
extern void irq_set_default_host(struct irq_host *host);
* irq_set_virq_count - Set the maximum number of virt irqs
* @count: number of linux virtual irqs, capped with NR_IRQS
* This is mainly for use by platforms like iSeries who want to program
* the virtual irq number in the controller to avoid the reverse mapping
extern void irq_set_virq_count(unsigned int count);
* irq_create_mapping - Map a hardware interrupt into linux virq space
* @host: host owning this hardware interrupt or NULL for default host
* @hwirq: hardware irq number in that host space
* Only one mapping per hardware interrupt is permitted. Returns a linux
* virq number.
* If the sense/trigger is to be specified, set_irq_type() should be called
* on the number returned from that call.
extern unsigned int irq_create_mapping(struct irq_host *host,
irq_hw_number_t hwirq);
* irq_dispose_mapping - Unmap an interrupt
* @virq: linux virq number of the interrupt to unmap
extern void irq_dispose_mapping(unsigned int virq);
* irq_find_mapping - Find a linux virq from an hw irq number.
* @host: host owning this hardware interrupt
* @hwirq: hardware irq number in that host space
* This is a slow path, for use by generic code. It's expected that an
* irq controller implementation directly calls the appropriate low level
* mapping function.
extern unsigned int irq_find_mapping(struct irq_host *host,
irq_hw_number_t hwirq);
* irq_create_direct_mapping - Allocate a virq for direct mapping
* @host: host to allocate the virq for or NULL for default host
* This routine is used for irq controllers which can choose the hardware
* interrupt numbers they generate. In such a case it's simplest to use
* the linux virq as the hardware interrupt number.
extern unsigned int irq_create_direct_mapping(struct irq_host *host);
* irq_radix_revmap - Find a linux virq from a hw irq number.
* @host: host owning this hardware interrupt
* @hwirq: hardware irq number in that host space
* This is a fast path, for use by irq controller code that uses radix tree
* revmaps
extern unsigned int irq_radix_revmap(struct irq_host *host,
irq_hw_number_t hwirq);
* irq_linear_revmap - Find a linux virq from a hw irq number.
* @host: host owning this hardware interrupt
* @hwirq: hardware irq number in that host space
* This is a fast path, for use by irq controller code that uses linear
* revmaps. It does fallback to the slow path if the revmap doesn't exist
* yet and will create the revmap entry with appropriate locking
extern unsigned int irq_linear_revmap(struct irq_host *host,
irq_hw_number_t hwirq);
* irq_alloc_virt - Allocate virtual irq numbers
* @host: host owning these new virtual irqs
* @count: number of consecutive numbers to allocate
* @hint: pass a hint number, the allocator will try to use a 1:1 mapping
* This is a low level function that is used internally by irq_create_mapping()
* and that can be used by some irq controllers implementations for things
* like allocating ranges of numbers for MSIs. The revmaps are left untouched.
extern unsigned int irq_alloc_virt(struct irq_host *host,
unsigned int count,
unsigned int hint);
* irq_free_virt - Free virtual irq numbers
* @virq: virtual irq number of the first interrupt to free
* @count: number of interrupts to free
* This function is the opposite of irq_alloc_virt. It will not clear reverse
* maps, this should be done previously by unmap'ing the interrupt. In fact,
* all interrupts covered by the range being freed should have been unmapped
* prior to calling this.
extern void irq_free_virt(unsigned int virq, unsigned int count);
/* -- OF helpers -- */
/* irq_create_of_mapping - Map a hardware interrupt into linux virq space
* @controller: Device node of the interrupt controller
* @inspec: Interrupt specifier from the device-tree
* @intsize: Size of the interrupt specifier from the device-tree
* This function is identical to irq_create_mapping except that it takes
* as input informations straight from the device-tree (typically the results
* of the of_irq_map_*() functions.
extern unsigned int irq_create_of_mapping(struct device_node *controller,
u32 *intspec, unsigned int intsize);
/* irq_of_parse_and_map - Parse nad Map an interrupt into linux virq space
* @device: Device node of the device whose interrupt is to be mapped
* @index: Index of the interrupt to map
* This function is a wrapper that chains of_irq_map_one() and
* irq_create_of_mapping() to make things easier to callers
extern unsigned int irq_of_parse_and_map(struct device_node *dev, int index);
/* -- End OF helpers -- */
* irq_early_init - Init irq remapping subsystem
extern void irq_early_init(void);
static __inline__ int irq_canonicalize(int irq)
return irq;
#else /* CONFIG_PPC_MERGE */
/* This number is used when no interrupt has been assigned */
#define NO_IRQ (-1)
#define NO_IRQ_IGNORE (-2)
* These constants are used for passing information about interrupt
* signal polarity and level/edge sensing to the low-level PIC chip
* drivers.
#define IRQ_SENSE_MASK 0x1
#define IRQ_SENSE_LEVEL 0x1 /* interrupt on active level */
#define IRQ_SENSE_EDGE 0x0 /* interrupt triggered by edge */
#define IRQ_POLARITY_POSITIVE 0x2 /* high level or low->high edge */
#define IRQ_POLARITY_NEGATIVE 0x0 /* low level or high->low edge */
#if defined(CONFIG_40x)
#include <asm/ibm4xx.h>
#define NR_BOARD_IRQS 0
#ifndef UIC_WIDTH /* Number of interrupts per device */
#define UIC_WIDTH 32
#ifndef NR_UICS /* number of UIC devices */
#define NR_UICS 1
#if defined (CONFIG_403)
* The PowerPC 403 cores' Asynchronous Interrupt Controller (AIC) has
* 32 possible interrupts, a majority of which are not implemented on
* all cores. There are six configurable, external interrupt pins and
* there are eight internal interrupts for the on-chip serial port
* (SPU), DMA controller, and JTAG controller.
#define NR_AIC_IRQS 32
#elif !defined (CONFIG_403)
* The PowerPC 405 cores' Universal Interrupt Controller (UIC) has 32
* possible interrupts as well. There are seven, configurable external
* interrupt pins and there are 17 internal interrupts for the on-chip
* serial port, DMA controller, on-chip Ethernet controller, PCI, etc.
#elif defined(CONFIG_44x)
#include <asm/ibm44x.h>
#define NR_UIC_IRQS 32
#elif defined(CONFIG_8xx)
/* Now include the board configuration specific associations.
#include <asm/mpc8xx.h>
/* The MPC8xx cores have 16 possible interrupts. There are eight
* possible level sensitive interrupts assigned and generated internally
* from such devices as CPM, PCMCIA, RTC, PIT, TimeBase and Decrementer.
* There are eight external interrupts (IRQs) that can be configured
* as either level or edge sensitive.
* On some implementations, there is also the possibility of an 8259
* through the PCI and PCI-ISA bridges.
* We are "flattening" the interrupt vectors of the cascaded CPM
* and 8259 interrupt controllers so that we can uniquely identify
* any interrupt source with a single integer.
#define NR_SIU_INTS 16
#define NR_CPM_INTS 32
#ifndef NR_8259_INTS
#define NR_8259_INTS 0
#define SIU_IRQ_OFFSET 0
/* These values must be zero-based and map 1:1 with the SIU configuration.
* They are used throughout the 8xx I/O subsystem to generate
* interrupt masks, flags, and other control patterns. This is why the
* current kernel assumption of the 8259 as the base controller is such
* a pain in the butt.
#define SIU_IRQ0 (0) /* Highest priority */
#define SIU_LEVEL0 (1)
#define SIU_IRQ1 (2)
#define SIU_LEVEL1 (3)
#define SIU_IRQ2 (4)
#define SIU_LEVEL2 (5)
#define SIU_IRQ3 (6)
#define SIU_LEVEL3 (7)
#define SIU_IRQ4 (8)
#define SIU_LEVEL4 (9)
#define SIU_IRQ5 (10)
#define SIU_LEVEL5 (11)
#define SIU_IRQ6 (12)
#define SIU_LEVEL6 (13)
#define SIU_IRQ7 (14)
#define SIU_LEVEL7 (15)
#define MPC8xx_INT_FEC1 SIU_LEVEL1
#define MPC8xx_INT_FEC2 SIU_LEVEL3
/* The internal interrupts we can configure as we see fit.
* My personal preference is CPM at level 2, which puts it above the
* MBX PCI/ISA/IDE interrupts.
/* Some internal interrupt registers use an 8-bit mask for the interrupt
* level instead of a number.
#define mk_int_int_mask(IL) (1 << (7 - (IL/2)))
#else /* CONFIG_40x + CONFIG_8xx */
* this is the # irq's for all ppc arch's (pmac/chrp/prep)
* so it is the max of them all
#define NR_IRQS 256
#define __DO_IRQ_CANON 1
#ifndef CONFIG_8260
#define NUM_8259_INTERRUPTS 16
#else /* CONFIG_8260 */
/* The 8260 has an internal interrupt controller with a maximum of
* 64 IRQs. We will use NR_IRQs from above since it is large enough.
* Don't be confused by the 8260 documentation where they list an
* "interrupt number" and "interrupt vector". We are only interested
* in the interrupt vector. There are "reserved" holes where the
* vector number increases, but the interrupt number in the table does not.
* (Document errata updates have fixed this...make sure you have up to
* date processor documentation -- Dan).
#define CPM_IRQ_OFFSET 0
#define NR_CPM_INTS 64
#define SIU_INT_ERROR ((uint)0x00 + CPM_IRQ_OFFSET)
#define SIU_INT_I2C ((uint)0x01 + CPM_IRQ_OFFSET)
#define SIU_INT_SPI ((uint)0x02 + CPM_IRQ_OFFSET)
#define SIU_INT_RISC ((uint)0x03 + CPM_IRQ_OFFSET)
#define SIU_INT_SMC1 ((uint)0x04 + CPM_IRQ_OFFSET)
#define SIU_INT_SMC2 ((uint)0x05 + CPM_IRQ_OFFSET)
#define SIU_INT_IDMA1 ((uint)0x06 + CPM_IRQ_OFFSET)
#define SIU_INT_IDMA2 ((uint)0x07 + CPM_IRQ_OFFSET)
#define SIU_INT_IDMA3 ((uint)0x08 + CPM_IRQ_OFFSET)
#define SIU_INT_IDMA4 ((uint)0x09 + CPM_IRQ_OFFSET)
#define SIU_INT_SDMA ((uint)0x0a + CPM_IRQ_OFFSET)
#define SIU_INT_USB ((uint)0x0b + CPM_IRQ_OFFSET)
#define SIU_INT_TIMER1 ((uint)0x0c + CPM_IRQ_OFFSET)
#define SIU_INT_TIMER2 ((uint)0x0d + CPM_IRQ_OFFSET)
#define SIU_INT_TIMER3 ((uint)0x0e + CPM_IRQ_OFFSET)
#define SIU_INT_TIMER4 ((uint)0x0f + CPM_IRQ_OFFSET)
#define SIU_INT_TMCNT ((uint)0x10 + CPM_IRQ_OFFSET)
#define SIU_INT_PIT ((uint)0x11 + CPM_IRQ_OFFSET)
#define SIU_INT_PCI ((uint)0x12 + CPM_IRQ_OFFSET)
#define SIU_INT_IRQ1 ((uint)0x13 + CPM_IRQ_OFFSET)
#define SIU_INT_IRQ2 ((uint)0x14 + CPM_IRQ_OFFSET)
#define SIU_INT_IRQ3 ((uint)0x15 + CPM_IRQ_OFFSET)
#define SIU_INT_IRQ4 ((uint)0x16 + CPM_IRQ_OFFSET)
#define SIU_INT_IRQ5 ((uint)0x17 + CPM_IRQ_OFFSET)
#define SIU_INT_IRQ6 ((uint)0x18 + CPM_IRQ_OFFSET)
#define SIU_INT_IRQ7 ((uint)0x19 + CPM_IRQ_OFFSET)
#define SIU_INT_FCC1 ((uint)0x20 + CPM_IRQ_OFFSET)
#define SIU_INT_FCC2 ((uint)0x21 + CPM_IRQ_OFFSET)
#define SIU_INT_FCC3 ((uint)0x22 + CPM_IRQ_OFFSET)
#define SIU_INT_MCC1 ((uint)0x24 + CPM_IRQ_OFFSET)
#define SIU_INT_MCC2 ((uint)0x25 + CPM_IRQ_OFFSET)
#define SIU_INT_SCC1 ((uint)0x28 + CPM_IRQ_OFFSET)
#define SIU_INT_SCC2 ((uint)0x29 + CPM_IRQ_OFFSET)
#define SIU_INT_SCC3 ((uint)0x2a + CPM_IRQ_OFFSET)
#define SIU_INT_SCC4 ((uint)0x2b + CPM_IRQ_OFFSET)
#define SIU_INT_PC15 ((uint)0x30 + CPM_IRQ_OFFSET)
#define SIU_INT_PC14 ((uint)0x31 + CPM_IRQ_OFFSET)
#define SIU_INT_PC13 ((uint)0x32 + CPM_IRQ_OFFSET)
#define SIU_INT_PC12 ((uint)0x33 + CPM_IRQ_OFFSET)
#define SIU_INT_PC11 ((uint)0x34 + CPM_IRQ_OFFSET)
#define SIU_INT_PC10 ((uint)0x35 + CPM_IRQ_OFFSET)
#define SIU_INT_PC9 ((uint)0x36 + CPM_IRQ_OFFSET)
#define SIU_INT_PC8 ((uint)0x37 + CPM_IRQ_OFFSET)
#define SIU_INT_PC7 ((uint)0x38 + CPM_IRQ_OFFSET)
#define SIU_INT_PC6 ((uint)0x39 + CPM_IRQ_OFFSET)
#define SIU_INT_PC5 ((uint)0x3a + CPM_IRQ_OFFSET)
#define SIU_INT_PC4 ((uint)0x3b + CPM_IRQ_OFFSET)
#define SIU_INT_PC3 ((uint)0x3c + CPM_IRQ_OFFSET)
#define SIU_INT_PC2 ((uint)0x3d + CPM_IRQ_OFFSET)
#define SIU_INT_PC1 ((uint)0x3e + CPM_IRQ_OFFSET)
#define SIU_INT_PC0 ((uint)0x3f + CPM_IRQ_OFFSET)
#endif /* CONFIG_8260 */
#endif /* Whatever way too big #ifdef */
#define NR_MASK_WORDS ((NR_IRQS + 31) / 32)
/* pedantic: these are long because they are used with set_bit --RR */
extern unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
* Because many systems have two overlapping names spaces for
* interrupts (ISA and XICS for example), and the ISA interrupts
* have historically not been easy to renumber, we allow ISA
* interrupts to take values 0 - 15, and shift up the remaining
* interrupts by 0x10.
extern int __irq_offset_value;
static inline int irq_offset_up(int irq)
return(irq + __irq_offset_value);
static inline int irq_offset_down(int irq)
return(irq - __irq_offset_value);
static inline int irq_offset_value(void)
return __irq_offset_value;
#ifdef __DO_IRQ_CANON
extern int ppc_do_canonicalize_irqs;
#define ppc_do_canonicalize_irqs 0
static __inline__ int irq_canonicalize(int irq)
if (ppc_do_canonicalize_irqs && irq == 2)
irq = 9;
return irq;
#endif /* CONFIG_PPC_MERGE */
extern int distribute_irqs;
struct irqaction;
struct pt_regs;
* Per-cpu stacks for handling hard and soft interrupts.
extern struct thread_info *hardirq_ctx[NR_CPUS];
extern struct thread_info *softirq_ctx[NR_CPUS];
extern void irq_ctx_init(void);
extern void call_do_softirq(struct thread_info *tp);
extern int call_handle_irq(int irq, void *p1,
struct thread_info *tp, void *func);
#define irq_ctx_init()
extern void do_IRQ(struct pt_regs *regs);
#endif /* _ASM_IRQ_H */
#endif /* __KERNEL__ */