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linux/drivers/pci/setup-irq.c

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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
/*
* drivers/pci/setup-irq.c
*
* Extruded from code written by
* Dave Rusling (david.rusling@reo.mts.dec.com)
* David Mosberger (davidm@cs.arizona.edu)
* David Miller (davem@redhat.com)
*
* Support routines for initializing a PCI subsystem.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/cache.h>
PCI: Add pci_assign_irq() function and have pci_fixup_irqs() use it Here we delete the static pdev_fixup_irq() function which is currently what pci_fixup_irqs() uses to actually assign the IRQs and replace it with the pci_assign_irq() function which changes the interface and uses the new function pointers stored in the host bridge structure. Eventually this will allow pci_fixup_irqs() to be removed entirely and the new deferred assignment code path will call pci_assign_irq() directly. However to ensure current users continue to work, a new implementation of pci_fixup_irqs() is introduced which simply wraps the functionality of pci_assign_irq(). Signed-off-by: Matthew Minter <matt@masarand.com> [lorenzo.pieralisi@arm.com: reworked comments/log] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2017-06-28 20:14:02 +00:00
#include "pci.h"
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
PCI: Add pci_assign_irq() function and have pci_fixup_irqs() use it Here we delete the static pdev_fixup_irq() function which is currently what pci_fixup_irqs() uses to actually assign the IRQs and replace it with the pci_assign_irq() function which changes the interface and uses the new function pointers stored in the host bridge structure. Eventually this will allow pci_fixup_irqs() to be removed entirely and the new deferred assignment code path will call pci_assign_irq() directly. However to ensure current users continue to work, a new implementation of pci_fixup_irqs() is introduced which simply wraps the functionality of pci_assign_irq(). Signed-off-by: Matthew Minter <matt@masarand.com> [lorenzo.pieralisi@arm.com: reworked comments/log] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2017-06-28 20:14:02 +00:00
void pci_assign_irq(struct pci_dev *dev)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
{
PCI: Add pci_assign_irq() function and have pci_fixup_irqs() use it Here we delete the static pdev_fixup_irq() function which is currently what pci_fixup_irqs() uses to actually assign the IRQs and replace it with the pci_assign_irq() function which changes the interface and uses the new function pointers stored in the host bridge structure. Eventually this will allow pci_fixup_irqs() to be removed entirely and the new deferred assignment code path will call pci_assign_irq() directly. However to ensure current users continue to work, a new implementation of pci_fixup_irqs() is introduced which simply wraps the functionality of pci_assign_irq(). Signed-off-by: Matthew Minter <matt@masarand.com> [lorenzo.pieralisi@arm.com: reworked comments/log] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2017-06-28 20:14:02 +00:00
u8 pin;
u8 slot = -1;
PCI: PCI devices get assigned redundant IRQs I'm currently working on a port to a CPCI board with a MPC5200. When testing the PCI interrupt routing, I discovered the following: Even devices which don't use interrupts (-> PCI Spec.: Interrupt Pin Register is zero), get an interrupt assigned (this is at least true for most of the PPC-targets I looked at). The cause is pretty obvious in drivers/pci/setup-irq.c. I guess at least in an ideal world with correctly designed hardware, the code should rather look as in the patch below. Of course it doesn't hurt anybody to have an unuseable IRQ assigned to a PCI-to-PCI-bridge (or something alike), but to me it seems a bit strange. Please correct me, if I'm mislead. The patch below is tested on the above mentioned CPCI-MPC5200 board and is compiler tested with the latest git-repository kernel on x86. Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-02-06 00:36:07 +00:00
int irq = 0;
PCI: Add pci_assign_irq() function and have pci_fixup_irqs() use it Here we delete the static pdev_fixup_irq() function which is currently what pci_fixup_irqs() uses to actually assign the IRQs and replace it with the pci_assign_irq() function which changes the interface and uses the new function pointers stored in the host bridge structure. Eventually this will allow pci_fixup_irqs() to be removed entirely and the new deferred assignment code path will call pci_assign_irq() directly. However to ensure current users continue to work, a new implementation of pci_fixup_irqs() is introduced which simply wraps the functionality of pci_assign_irq(). Signed-off-by: Matthew Minter <matt@masarand.com> [lorenzo.pieralisi@arm.com: reworked comments/log] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2017-06-28 20:14:02 +00:00
struct pci_host_bridge *hbrg = pci_find_host_bridge(dev->bus);
if (!(hbrg->map_irq)) {
dev_dbg(&dev->dev, "runtime IRQ mapping not provided by arch\n");
return;
}
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
/* If this device is not on the primary bus, we need to figure out
which interrupt pin it will come in on. We know which slot it
will come in on 'cos that slot is where the bridge is. Each
time the interrupt line passes through a PCI-PCI bridge we must
apply the swizzle function. */
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
PCI: PCI devices get assigned redundant IRQs I'm currently working on a port to a CPCI board with a MPC5200. When testing the PCI interrupt routing, I discovered the following: Even devices which don't use interrupts (-> PCI Spec.: Interrupt Pin Register is zero), get an interrupt assigned (this is at least true for most of the PPC-targets I looked at). The cause is pretty obvious in drivers/pci/setup-irq.c. I guess at least in an ideal world with correctly designed hardware, the code should rather look as in the patch below. Of course it doesn't hurt anybody to have an unuseable IRQ assigned to a PCI-to-PCI-bridge (or something alike), but to me it seems a bit strange. Please correct me, if I'm mislead. The patch below is tested on the above mentioned CPCI-MPC5200 board and is compiler tested with the latest git-repository kernel on x86. Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-02-06 00:36:07 +00:00
/* Cope with illegal. */
if (pin > 4)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
pin = 1;
PCI: Add pci_assign_irq() function and have pci_fixup_irqs() use it Here we delete the static pdev_fixup_irq() function which is currently what pci_fixup_irqs() uses to actually assign the IRQs and replace it with the pci_assign_irq() function which changes the interface and uses the new function pointers stored in the host bridge structure. Eventually this will allow pci_fixup_irqs() to be removed entirely and the new deferred assignment code path will call pci_assign_irq() directly. However to ensure current users continue to work, a new implementation of pci_fixup_irqs() is introduced which simply wraps the functionality of pci_assign_irq(). Signed-off-by: Matthew Minter <matt@masarand.com> [lorenzo.pieralisi@arm.com: reworked comments/log] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2017-06-28 20:14:02 +00:00
if (pin) {
PCI: PCI devices get assigned redundant IRQs I'm currently working on a port to a CPCI board with a MPC5200. When testing the PCI interrupt routing, I discovered the following: Even devices which don't use interrupts (-> PCI Spec.: Interrupt Pin Register is zero), get an interrupt assigned (this is at least true for most of the PPC-targets I looked at). The cause is pretty obvious in drivers/pci/setup-irq.c. I guess at least in an ideal world with correctly designed hardware, the code should rather look as in the patch below. Of course it doesn't hurt anybody to have an unuseable IRQ assigned to a PCI-to-PCI-bridge (or something alike), but to me it seems a bit strange. Please correct me, if I'm mislead. The patch below is tested on the above mentioned CPCI-MPC5200 board and is compiler tested with the latest git-repository kernel on x86. Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-02-06 00:36:07 +00:00
/* Follow the chain of bridges, swizzling as we go. */
PCI: Add pci_assign_irq() function and have pci_fixup_irqs() use it Here we delete the static pdev_fixup_irq() function which is currently what pci_fixup_irqs() uses to actually assign the IRQs and replace it with the pci_assign_irq() function which changes the interface and uses the new function pointers stored in the host bridge structure. Eventually this will allow pci_fixup_irqs() to be removed entirely and the new deferred assignment code path will call pci_assign_irq() directly. However to ensure current users continue to work, a new implementation of pci_fixup_irqs() is introduced which simply wraps the functionality of pci_assign_irq(). Signed-off-by: Matthew Minter <matt@masarand.com> [lorenzo.pieralisi@arm.com: reworked comments/log] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2017-06-28 20:14:02 +00:00
if (hbrg->swizzle_irq)
slot = (*(hbrg->swizzle_irq))(dev, &pin);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
PCI: Add pci_assign_irq() function and have pci_fixup_irqs() use it Here we delete the static pdev_fixup_irq() function which is currently what pci_fixup_irqs() uses to actually assign the IRQs and replace it with the pci_assign_irq() function which changes the interface and uses the new function pointers stored in the host bridge structure. Eventually this will allow pci_fixup_irqs() to be removed entirely and the new deferred assignment code path will call pci_assign_irq() directly. However to ensure current users continue to work, a new implementation of pci_fixup_irqs() is introduced which simply wraps the functionality of pci_assign_irq(). Signed-off-by: Matthew Minter <matt@masarand.com> [lorenzo.pieralisi@arm.com: reworked comments/log] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2017-06-28 20:14:02 +00:00
/*
* If a swizzling function is not used map_irq must
* ignore slot
*/
irq = (*(hbrg->map_irq))(dev, slot, pin);
PCI: PCI devices get assigned redundant IRQs I'm currently working on a port to a CPCI board with a MPC5200. When testing the PCI interrupt routing, I discovered the following: Even devices which don't use interrupts (-> PCI Spec.: Interrupt Pin Register is zero), get an interrupt assigned (this is at least true for most of the PPC-targets I looked at). The cause is pretty obvious in drivers/pci/setup-irq.c. I guess at least in an ideal world with correctly designed hardware, the code should rather look as in the patch below. Of course it doesn't hurt anybody to have an unuseable IRQ assigned to a PCI-to-PCI-bridge (or something alike), but to me it seems a bit strange. Please correct me, if I'm mislead. The patch below is tested on the above mentioned CPCI-MPC5200 board and is compiler tested with the latest git-repository kernel on x86. Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-02-06 00:36:07 +00:00
if (irq == -1)
irq = 0;
}
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
dev->irq = irq;
PCI: Add pci_assign_irq() function and have pci_fixup_irqs() use it Here we delete the static pdev_fixup_irq() function which is currently what pci_fixup_irqs() uses to actually assign the IRQs and replace it with the pci_assign_irq() function which changes the interface and uses the new function pointers stored in the host bridge structure. Eventually this will allow pci_fixup_irqs() to be removed entirely and the new deferred assignment code path will call pci_assign_irq() directly. However to ensure current users continue to work, a new implementation of pci_fixup_irqs() is introduced which simply wraps the functionality of pci_assign_irq(). Signed-off-by: Matthew Minter <matt@masarand.com> [lorenzo.pieralisi@arm.com: reworked comments/log] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2017-06-28 20:14:02 +00:00
dev_dbg(&dev->dev, "assign IRQ: got %d\n", dev->irq);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
/* Always tell the device, so the driver knows what is
the real IRQ to use; the device does not use it. */
PCI: Inline and remove pcibios_update_irq() pcibios_update_irq() was a weak function with only one trivial implementation. Inline it and remove the weak function. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2017-08-10 17:49:57 +00:00
pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
}
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