[SPARC64]: Virtualize IRQ numbers.
Inspired by PowerPC XICS interrupt support code.
All IRQs are virtualized in order to keep NR_IRQS from needing
to be too large. Interrupts on sparc64 are arbitrary 11-bit
values, but we don't need to define NR_IRQS to 2048 if we
virtualize the IRQs.
As PCI and SBUS controller drivers build device IRQs, we divy
out virtual IRQ numbers incrementally starting at 1. Zero is
a special virtual IRQ used for the timer interrupt.
So device drivers all see virtual IRQs, and all the normal
interfaces such as request_irq(), enable_irq(), etc. translate
that into a real IRQ number in order to configure the IRQ.
At this point knowledge of the struct ino_bucket is almost
entirely contained within arch/sparc64/kernel/irq.c There are
a few small bits in the PCI controller drivers that need to
be swept away before we can remove ino_bucket's definition
out of asm-sparc64/irq.h and privately into kernel/irq.c
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/pci_schizo.c b/arch/sparc64/kernel/pci_schizo.c
index ca49ef0..0c400b5 100644
--- a/arch/sparc64/kernel/pci_schizo.c
+++ b/arch/sparc64/kernel/pci_schizo.c
@@ -270,25 +270,33 @@
}
}
+static unsigned long schizo_ino_to_iclr(struct pci_pbm_info *pbm,
+ unsigned int ino)
+{
+ ino &= PCI_IRQ_INO;
+ return pbm->pbm_regs + schizo_iclr_offset(ino) + 4;
+}
+
+static unsigned long schizo_ino_to_imap(struct pci_pbm_info *pbm,
+ unsigned int ino)
+{
+ ino &= PCI_IRQ_INO;
+ return pbm->pbm_regs + schizo_imap_offset(ino) + 4;
+}
+
static unsigned int schizo_irq_build(struct pci_pbm_info *pbm,
struct pci_dev *pdev,
unsigned int ino)
{
- struct ino_bucket *bucket;
unsigned long imap, iclr;
- unsigned long imap_off, iclr_off;
int ign_fixup;
+ int virt_irq;
ino &= PCI_IRQ_INO;
- imap_off = schizo_imap_offset(ino);
/* Now build the IRQ bucket. */
- imap = pbm->pbm_regs + imap_off;
- imap += 4;
-
- iclr_off = schizo_iclr_offset(ino);
- iclr = pbm->pbm_regs + iclr_off;
- iclr += 4;
+ imap = schizo_ino_to_imap(pbm, ino);
+ iclr = schizo_ino_to_iclr(pbm, ino);
/* On Schizo, no inofixup occurs. This is because each
* INO has it's own IMAP register. On Psycho and Sabre
@@ -305,19 +313,17 @@
ign_fixup = (1 << 6);
}
- bucket = __bucket(build_irq(ign_fixup, iclr, imap));
- bucket->flags |= IBF_PCI;
+ virt_irq = build_irq(ign_fixup, iclr, imap, IBF_PCI);
if (pdev && pbm->chip_type == PBM_CHIP_TYPE_TOMATILLO) {
- struct irq_desc *p = bucket->irq_info;
-
- p->pre_handler = tomatillo_wsync_handler;
- p->pre_handler_arg1 = ((pbm->chip_version <= 4) ?
- (void *) 1 : (void *) 0);
- p->pre_handler_arg2 = (void *) pbm->sync_reg;
+ irq_install_pre_handler(virt_irq,
+ tomatillo_wsync_handler,
+ ((pbm->chip_version <= 4) ?
+ (void *) 1 : (void *) 0),
+ (void *) pbm->sync_reg);
}
- return __irq(bucket);
+ return virt_irq;
}
/* SCHIZO error handling support. */
@@ -358,7 +364,6 @@
static void schizo_clear_other_err_intr(struct pci_controller_info *p, int irq)
{
struct pci_pbm_info *pbm;
- struct ino_bucket *bucket;
unsigned long iclr;
/* Do not clear the interrupt for the other PCI bus.
@@ -376,11 +381,11 @@
else
pbm = &p->pbm_A;
- irq = schizo_irq_build(pbm, NULL,
- (pbm->portid << 6) | (irq & IMAP_INO));
- bucket = __bucket(irq);
- iclr = bucket->iclr;
+ schizo_irq_build(pbm, NULL,
+ (pbm->portid << 6) | (irq & IMAP_INO));
+ iclr = schizo_ino_to_iclr(pbm,
+ (pbm->portid << 6) | (irq & IMAP_INO));
upa_writel(ICLR_IDLE, iclr);
}
@@ -1125,7 +1130,6 @@
{
struct pci_pbm_info *pbm;
unsigned int irq;
- struct ino_bucket *bucket;
u64 tmp, err_mask, err_no_mask;
/* Build IRQs and register handlers. */
@@ -1137,8 +1141,7 @@
pbm->name);
prom_halt();
}
- bucket = __bucket(irq);
- tmp = upa_readl(bucket->imap);
+ tmp = upa_readl(schizo_ino_to_imap(pbm, (pbm->portid << 6) | SCHIZO_UE_INO));
upa_writel(tmp, (pbm->pbm_regs +
schizo_imap_offset(SCHIZO_UE_INO) + 4));
@@ -1150,8 +1153,7 @@
pbm->name);
prom_halt();
}
- bucket = __bucket(irq);
- tmp = upa_readl(bucket->imap);
+ tmp = upa_readl(schizo_ino_to_imap(pbm, (pbm->portid << 6) | SCHIZO_CE_INO));
upa_writel(tmp, (pbm->pbm_regs +
schizo_imap_offset(SCHIZO_CE_INO) + 4));
@@ -1164,8 +1166,8 @@
pbm->name);
prom_halt();
}
- bucket = __bucket(irq);
- tmp = upa_readl(bucket->imap);
+ tmp = upa_readl(schizo_ino_to_imap(pbm, ((pbm->portid << 6) |
+ SCHIZO_PCIERR_A_INO)));
upa_writel(tmp, (pbm->pbm_regs +
schizo_imap_offset(SCHIZO_PCIERR_A_INO) + 4));
@@ -1178,8 +1180,8 @@
pbm->name);
prom_halt();
}
- bucket = __bucket(irq);
- tmp = upa_readl(bucket->imap);
+ tmp = upa_readl(schizo_ino_to_imap(pbm, ((pbm->portid << 6) |
+ SCHIZO_PCIERR_B_INO)));
upa_writel(tmp, (pbm->pbm_regs +
schizo_imap_offset(SCHIZO_PCIERR_B_INO) + 4));
@@ -1191,8 +1193,8 @@
pbm->name);
prom_halt();
}
- bucket = __bucket(irq);
- tmp = upa_readl(bucket->imap);
+ tmp = upa_readl(schizo_ino_to_imap(pbm, ((pbm->portid << 6) |
+ SCHIZO_SERR_INO)));
upa_writel(tmp, (pbm->pbm_regs +
schizo_imap_offset(SCHIZO_SERR_INO) + 4));
@@ -1263,7 +1265,6 @@
{
struct pci_pbm_info *pbm;
unsigned int irq;
- struct ino_bucket *bucket;
u64 tmp, err_mask, err_no_mask;
/* Build IRQs and register handlers. */
@@ -1275,8 +1276,7 @@
pbm->name);
prom_halt();
}
- bucket = __bucket(irq);
- tmp = upa_readl(bucket->imap);
+ tmp = upa_readl(schizo_ino_to_imap(pbm, (pbm->portid << 6) | SCHIZO_UE_INO));
upa_writel(tmp, (pbm->pbm_regs + schizo_imap_offset(SCHIZO_UE_INO) + 4));
pbm = pbm_for_ino(p, SCHIZO_CE_INO);
@@ -1287,8 +1287,7 @@
pbm->name);
prom_halt();
}
- bucket = __bucket(irq);
- tmp = upa_readl(bucket->imap);
+ tmp = upa_readl(schizo_ino_to_imap(pbm, (pbm->portid << 6) | SCHIZO_CE_INO));
upa_writel(tmp, (pbm->pbm_regs + schizo_imap_offset(SCHIZO_CE_INO) + 4));
pbm = pbm_for_ino(p, SCHIZO_PCIERR_A_INO);
@@ -1299,8 +1298,7 @@
pbm->name);
prom_halt();
}
- bucket = __bucket(irq);
- tmp = upa_readl(bucket->imap);
+ tmp = upa_readl(schizo_ino_to_imap(pbm, (pbm->portid << 6) | SCHIZO_PCIERR_A_INO));
upa_writel(tmp, (pbm->pbm_regs + schizo_imap_offset(SCHIZO_PCIERR_A_INO) + 4));
pbm = pbm_for_ino(p, SCHIZO_PCIERR_B_INO);
@@ -1311,8 +1309,7 @@
pbm->name);
prom_halt();
}
- bucket = __bucket(irq);
- tmp = upa_readl(bucket->imap);
+ tmp = upa_readl(schizo_ino_to_imap(pbm, (pbm->portid << 6) | SCHIZO_PCIERR_B_INO));
upa_writel(tmp, (pbm->pbm_regs + schizo_imap_offset(SCHIZO_PCIERR_B_INO) + 4));
pbm = pbm_for_ino(p, SCHIZO_SERR_INO);
@@ -1323,8 +1320,7 @@
pbm->name);
prom_halt();
}
- bucket = __bucket(irq);
- tmp = upa_readl(bucket->imap);
+ tmp = upa_readl(schizo_ino_to_imap(pbm, (pbm->portid << 6) | SCHIZO_SERR_INO));
upa_writel(tmp, (pbm->pbm_regs + schizo_imap_offset(SCHIZO_SERR_INO) + 4));
/* Enable UE and CE interrupts for controller. */