[PATCH] Initial generic hypertransport interrupt support

This patch implements two functions ht_create_irq and ht_destroy_irq for
use by drivers.  Several other functions are implemented as helpers for
arch specific irq_chip handlers.

The driver for the card I tested this on isn't yet ready to be merged.
However this code is and hypertransport irqs are in use in a few other
places in the kernel.  Not that any of this will get merged before 2.6.19

Because the ipath-ht400 is slightly out of spec this code will need to be
generalized to work there.

I think all of the powerpc uses are for a plain interrupt controller in a
chipset so support for native hypertransport devices is a little less
interesting.

However I think this is a half way decent model on how to separate arch
specific and generic helper code, and I think this is a functional model of
how to get the architecture dependencies out of the msi code.

[akpm@osdl.org: Kconfig fix]
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Greg KH <greg@kroah.com>
Cc: Andi Kleen <ak@muc.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 101 insertions, 0 deletions

diff --git a/include/asm-i386/hypertransport.h b/include/asm-i386/hypertransport.h
new file mode 100644
index 000000000000..c16c6ff4bdd7
--- /dev/null
+++ b/include/asm-i386/hypertransport.h
@@ -0,0 +1,42 @@
+#ifndef ASM_HYPERTRANSPORT_H
+#define ASM_HYPERTRANSPORT_H
+
+/*
+ * Constants for x86 Hypertransport Interrupts.
+ */
+
+#define HT_IRQ_LOW_BASE                 0xf8000000
+
+#define HT_IRQ_LOW_VECTOR_SHIFT         16
+#define  HT_IRQ_LOW_VECTOR_MASK         0x00ff0000
+#define  HT_IRQ_LOW_VECTOR(v)           (((v) << HT_IRQ_LOW_VECTOR_SHIFT) & HT_IRQ_LOW_VECTOR_MASK)
+
+#define HT_IRQ_LOW_DEST_ID_SHIFT        8
+#define  HT_IRQ_LOW_DEST_ID_MASK        0x0000ff00
+#define  HT_IRQ_LOW_DEST_ID(v)          (((v) << HT_IRQ_LOW_DEST_ID_SHIFT) & HT_IRQ_LOW_DEST_ID_MASK)
+
+#define HT_IRQ_LOW_DM_PHYSICAL          0x0000000
+#define HT_IRQ_LOW_DM_LOGICAL           0x0000040
+
+#define HT_IRQ_LOW_RQEOI_EDGE           0x0000000
+#define HT_IRQ_LOW_RQEOI_LEVEL          0x0000020
+
+
+#define HT_IRQ_LOW_MT_FIXED             0x0000000
+#define HT_IRQ_LOW_MT_ARBITRATED        0x0000004
+#define HT_IRQ_LOW_MT_SMI               0x0000008
+#define HT_IRQ_LOW_MT_NMI               0x000000c
+#define HT_IRQ_LOW_MT_INIT              0x0000010
+#define HT_IRQ_LOW_MT_STARTUP           0x0000014
+#define HT_IRQ_LOW_MT_EXTINT            0x0000018
+#define HT_IRQ_LOW_MT_LINT1             0x000008c
+#define HT_IRQ_LOW_MT_LINT0             0x0000098
+
+#define HT_IRQ_LOW_IRQ_MASKED           0x0000001
+
+
+#define HT_IRQ_HIGH_DEST_ID_SHIFT       0
+#define  HT_IRQ_HIGH_DEST_ID_MASK       0x00ffffff
+#define  HT_IRQ_HIGH_DEST_ID(v)         ((((v) >> 8) << HT_IRQ_HIGH_DEST_ID_SHIFT) & HT_IRQ_HIGH_DEST_ID_MASK)
+
+#endif /* ASM_HYPERTRANSPORT_H */
diff --git a/include/asm-x86_64/hypertransport.h b/include/asm-x86_64/hypertransport.h
new file mode 100644
index 000000000000..c16c6ff4bdd7
--- /dev/null
+++ b/include/asm-x86_64/hypertransport.h
@@ -0,0 +1,42 @@
+#ifndef ASM_HYPERTRANSPORT_H
+#define ASM_HYPERTRANSPORT_H
+
+/*
+ * Constants for x86 Hypertransport Interrupts.
+ */
+
+#define HT_IRQ_LOW_BASE                 0xf8000000
+
+#define HT_IRQ_LOW_VECTOR_SHIFT         16
+#define  HT_IRQ_LOW_VECTOR_MASK         0x00ff0000
+#define  HT_IRQ_LOW_VECTOR(v)           (((v) << HT_IRQ_LOW_VECTOR_SHIFT) & HT_IRQ_LOW_VECTOR_MASK)
+
+#define HT_IRQ_LOW_DEST_ID_SHIFT        8
+#define  HT_IRQ_LOW_DEST_ID_MASK        0x0000ff00
+#define  HT_IRQ_LOW_DEST_ID(v)          (((v) << HT_IRQ_LOW_DEST_ID_SHIFT) & HT_IRQ_LOW_DEST_ID_MASK)
+
+#define HT_IRQ_LOW_DM_PHYSICAL          0x0000000
+#define HT_IRQ_LOW_DM_LOGICAL           0x0000040
+
+#define HT_IRQ_LOW_RQEOI_EDGE           0x0000000
+#define HT_IRQ_LOW_RQEOI_LEVEL          0x0000020
+
+
+#define HT_IRQ_LOW_MT_FIXED             0x0000000
+#define HT_IRQ_LOW_MT_ARBITRATED        0x0000004
+#define HT_IRQ_LOW_MT_SMI               0x0000008
+#define HT_IRQ_LOW_MT_NMI               0x000000c
+#define HT_IRQ_LOW_MT_INIT              0x0000010
+#define HT_IRQ_LOW_MT_STARTUP           0x0000014
+#define HT_IRQ_LOW_MT_EXTINT            0x0000018
+#define HT_IRQ_LOW_MT_LINT1             0x000008c
+#define HT_IRQ_LOW_MT_LINT0             0x0000098
+
+#define HT_IRQ_LOW_IRQ_MASKED           0x0000001
+
+
+#define HT_IRQ_HIGH_DEST_ID_SHIFT       0
+#define  HT_IRQ_HIGH_DEST_ID_MASK       0x00ffffff
+#define  HT_IRQ_HIGH_DEST_ID(v)         ((((v) >> 8) << HT_IRQ_HIGH_DEST_ID_SHIFT) & HT_IRQ_HIGH_DEST_ID_MASK)
+
+#endif /* ASM_HYPERTRANSPORT_H */
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 2aabe90f1cd2..9b34bc8f34e4 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -681,6 +681,23 @@ extern int msi_register(struct msi_ops *ops);
 
 #endif
 
+#ifdef CONFIG_HT_IRQ
+/* Helper functions.. */
+void write_ht_irq_low(unsigned int irq, u32 data);
+void write_ht_irq_high(unsigned int irq, u32 data);
+u32  read_ht_irq_low(unsigned int irq);
+u32  read_ht_irq_high(unsigned int irq);
+void mask_ht_irq(unsigned int irq);
+void unmask_ht_irq(unsigned int irq);
+
+/* The functions a driver should call */
+int  ht_create_irq(struct pci_dev *dev, int idx);
+void ht_destroy_irq(unsigned int irq);
+
+/* The arch hook for getting things started */
+int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev);
+#endif /* CONFIG_HT_IRQ */
+
 extern void pci_block_user_cfg_access(struct pci_dev *dev);
 extern void pci_unblock_user_cfg_access(struct pci_dev *dev);