1 files changed, 381 insertions, 55 deletions

diff --git a/include/asm-powerpc/irq.h b/include/asm-powerpc/irq.h
index 7bc6d73b282..d903a62959d 100644
--- a/include/asm-powerpc/irq.h
+++ b/include/asm-powerpc/irq.h
@@ -11,30 +11,12 @@
 
 #include <linux/config.h>
 #include <linux/threads.h>
+#include <linux/list.h>
+#include <linux/radix-tree.h>
 
 #include <asm/types.h>
 #include <asm/atomic.h>
 
-/* this number is used when no interrupt has been assigned */
-#define NO_IRQ                  (-1)
-
-/*
- * 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_MASK       0x2
-#define IRQ_POLARITY_POSITIVE   0x2     /* high level or low->high edge */
-#define IRQ_POLARITY_NEGATIVE   0x0     /* low level or high->low edge */
-
-/*
- * IRQ line status macro IRQ_PER_CPU is used
- */
-#define ARCH_HAS_IRQ_PER_CPU
 
 #define get_irq_desc(irq) (&irq_desc[(irq)])
 
@@ -42,50 +24,313 @@
 #define for_each_irq(i) \
         for ((i) = 0; (i) < NR_IRQS; ++(i))
 
-#ifdef CONFIG_PPC64
+extern atomic_t ppc_n_lost_interrupts;
 
-/*
- * Maximum number of interrupt sources that we can handle.
+#ifdef CONFIG_PPC_MERGE
+
+/* 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
 
-/* Interrupt numbers are virtual in case they are sparsely
- * distributed by the hardware.
+/* Number of irqs reserved for the legacy controller */
+#define NUM_ISA_INTERRUPTS      16
+
+/* 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);
+
+        /* 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;
+};
+
+/* 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];
+
+
+/***
+ * irq_alloc_host - Allocate a new irq_host data structure
+ * @node: 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(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_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 virt_irq_to_real_map[NR_IRQS];
+extern unsigned int irq_create_of_mapping(struct device_node *controller,
+                                          u32 *intspec, unsigned int intsize);
 
-/* The maximum virtual IRQ number that we support.  This
- * can be set by the platform and will be reduced by the
- * value of __irq_offset_value.  It defaults to and is
- * capped by (NR_IRQS - 1).
+
+/* 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 virt_irq_max;
+extern unsigned int irq_of_parse_and_map(struct device_node *dev, int index);
+
+/* -- End OF helpers -- */
 
-/* Create a mapping for a real_irq if it doesn't already exist.
- * Return the virtual irq as a convenience.
+/***
+ * irq_early_init - Init irq remapping subsystem
  */
-int virt_irq_create_mapping(unsigned int real_irq);
-void virt_irq_init(void);
+extern void irq_early_init(void);
 
-static inline unsigned int virt_irq_to_real(unsigned int virt_irq)
+static __inline__ int irq_canonicalize(int irq)
 {
-        return virt_irq_to_real_map[virt_irq];
+        return irq;
 }
 
-extern unsigned int real_irq_to_virt_slowpath(unsigned int real_irq);
+
+#else /* CONFIG_PPC_MERGE */
+
+/* This number is used when no interrupt has been assigned */
+#define NO_IRQ                  (-1)
+#define NO_IRQ_IGNORE           (-2)
+
 
 /*
- * List of interrupt controllers.
+ * These constants are used for passing information about interrupt
+ * signal polarity and level/edge sensing to the low-level PIC chip
+ * drivers.
  */
-#define IC_INVALID    0
-#define IC_OPEN_PIC   1
-#define IC_PPC_XIC    2
-#define IC_CELL_PIC   3
-#define IC_ISERIES    4
+#define IRQ_SENSE_MASK          0x1
+#define IRQ_SENSE_LEVEL         0x1     /* interrupt on active level */
+#define IRQ_SENSE_EDGE          0x0     /* interrupt triggered by edge */
 
-extern u64 ppc64_interrupt_controller;
+#define IRQ_POLARITY_MASK       0x2
+#define IRQ_POLARITY_POSITIVE   0x2     /* high level or low->high edge */
+#define IRQ_POLARITY_NEGATIVE   0x0     /* low level or high->low edge */
 
-#else /* 32-bit */
 
 #if defined(CONFIG_40x)
 #include <asm/ibm4xx.h>
@@ -348,6 +593,92 @@ extern u64 ppc64_interrupt_controller;
 #define SIU_INT_PC1             ((uint)0x3e+CPM_IRQ_OFFSET)
 #define SIU_INT_PC0             ((uint)0x3f+CPM_IRQ_OFFSET)
 
+#elif defined(CONFIG_PPC_86xx)
+#include <asm/mpc86xx.h>
+
+#define NR_EPIC_INTS 48
+#ifndef NR_8259_INTS
+#define NR_8259_INTS 16 /*ULI 1575 can route 12 interrupts */
+#endif
+#define NUM_8259_INTERRUPTS NR_8259_INTS
+
+#ifndef I8259_OFFSET
+#define I8259_OFFSET 0
+#endif
+
+#define NR_IRQS 256
+
+/* Internal IRQs on MPC86xx OpenPIC */
+
+#ifndef MPC86xx_OPENPIC_IRQ_OFFSET
+#define MPC86xx_OPENPIC_IRQ_OFFSET NR_8259_INTS
+#endif
+
+/* The 48 internal sources */
+#define MPC86xx_IRQ_NULL        ( 0 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_MCM         ( 1 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_DDR         ( 2 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_LBC         ( 3 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_DMA0        ( 4 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_DMA1        ( 5 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_DMA2        ( 6 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_DMA3        ( 7 + MPC86xx_OPENPIC_IRQ_OFFSET)
+
+/* no 10,11 */
+#define MPC86xx_IRQ_UART2       (12 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_TSEC1_TX    (13 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_TSEC1_RX    (14 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_TSEC3_TX    (15 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_TSEC3_RX    (16 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_TSEC3_ERROR (17 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_TSEC1_ERROR (18 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_TSEC2_TX    (19 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_TSEC2_RX    (20 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_TSEC4_TX    (21 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_TSEC4_RX    (22 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_TSEC4_ERROR (23 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_TSEC2_ERROR (24 + MPC86xx_OPENPIC_IRQ_OFFSET)
+/* no 25 */
+#define MPC86xx_IRQ_UART1       (26 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_IIC         (27 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_PERFMON       (28 + MPC86xx_OPENPIC_IRQ_OFFSET)
+/* no 29,30,31 */
+#define MPC86xx_IRQ_SRIO_ERROR    (32 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_SRIO_OUT_BELL (33 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_SRIO_IN_BELL  (34 + MPC86xx_OPENPIC_IRQ_OFFSET)
+/* no 35,36 */
+#define MPC86xx_IRQ_SRIO_OUT_MSG1 (37 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_SRIO_IN_MSG1  (38 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_SRIO_OUT_MSG2 (39 + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_SRIO_IN_MSG2  (40 + MPC86xx_OPENPIC_IRQ_OFFSET)
+
+/* The 12 external interrupt lines */
+#define MPC86xx_IRQ_EXT_BASE    48
+#define MPC86xx_IRQ_EXT0        (0 + MPC86xx_IRQ_EXT_BASE \
+                + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_EXT1        (1 + MPC86xx_IRQ_EXT_BASE \
+                + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_EXT2        (2 + MPC86xx_IRQ_EXT_BASE \
+                + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_EXT3        (3 + MPC86xx_IRQ_EXT_BASE \
+                + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_EXT4        (4 + MPC86xx_IRQ_EXT_BASE \
+                + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_EXT5        (5 + MPC86xx_IRQ_EXT_BASE \
+                + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_EXT6        (6 + MPC86xx_IRQ_EXT_BASE \
+                + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_EXT7        (7 + MPC86xx_IRQ_EXT_BASE \
+                + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_EXT8        (8 + MPC86xx_IRQ_EXT_BASE \
+                + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_EXT9        (9 + MPC86xx_IRQ_EXT_BASE \
+                + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_EXT10       (10 + MPC86xx_IRQ_EXT_BASE \
+                + MPC86xx_OPENPIC_IRQ_OFFSET)
+#define MPC86xx_IRQ_EXT11       (11 + MPC86xx_IRQ_EXT_BASE \
+                + MPC86xx_OPENPIC_IRQ_OFFSET)
+
 #else /* CONFIG_40x + CONFIG_8xx */
 /*
  * this is the # irq's for all ppc arch's (pmac/chrp/prep)
@@ -432,16 +763,11 @@ extern u64 ppc64_interrupt_controller;
 
 #endif /* CONFIG_8260 */
 
-#endif
+#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];
-extern atomic_t ppc_n_lost_interrupts;
-
-#define virt_irq_create_mapping(x)      (x)
-
-#endif
 
 /*
  * Because many systems have two overlapping names spaces for
@@ -480,6 +806,7 @@ static __inline__ int irq_canonicalize(int irq)
                 irq = 9;
         return irq;
 }
+#endif /* CONFIG_PPC_MERGE */
 
 extern int distribute_irqs;
 
@@ -499,9 +826,8 @@ 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___do_IRQ(int irq, struct pt_regs *regs,
-                struct thread_info *tp);
-
+extern int call_handle_irq(int irq, void *p1, void *p2,
+                           struct thread_info *tp, void *func);
 #else
 #define irq_ctx_init()