[POWERPC] PowerPC MSI infrastructure
This provides the architecture specific hooks to support MSI on powerpc. We implement the newly added arch_setup_msi_irqs() and arch_teardown_msi_irqs(), and then delegate to ppc_md routines. Platforms that don't implement MSI will leave the ppc_md calls blank, arch_msi_check_device() will detect this and return ENOSYS. Drivers should detect this error and continue to use LSI. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
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@ -682,6 +682,7 @@ config PCI
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&& !PPC_85xx && !PPC_86xx
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default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
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default PCI_QSPAN if !4xx && !CPM2 && 8xx
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select ARCH_SUPPORTS_MSI
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help
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Find out whether your system includes a PCI bus. PCI is the name of
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a bus system, i.e. the way the CPU talks to the other stuff inside
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@ -68,6 +68,7 @@ obj-$(CONFIG_MODULES) += $(module-y)
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pci64-$(CONFIG_PPC64) += pci_64.o pci_dn.o
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pci32-$(CONFIG_PPC32) := pci_32.o
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obj-$(CONFIG_PCI) += $(pci64-y) $(pci32-y)
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obj-$(CONFIG_PCI_MSI) += msi.o
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kexec-$(CONFIG_PPC64) := machine_kexec_64.o
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kexec-$(CONFIG_PPC32) := machine_kexec_32.o
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obj-$(CONFIG_KEXEC) += machine_kexec.o crash.o $(kexec-y)
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@ -0,0 +1,38 @@
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/*
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* Copyright 2006-2007, Michael Ellerman, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/msi.h>
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#include <asm/machdep.h>
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int arch_msi_check_device(struct pci_dev* dev, int nvec, int type)
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{
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if (!ppc_md.setup_msi_irqs || !ppc_md.teardown_msi_irqs) {
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pr_debug("msi: Platform doesn't provide MSI callbacks.\n");
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return -ENOSYS;
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}
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if (ppc_md.msi_check_device) {
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pr_debug("msi: Using platform check routine.\n");
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return ppc_md.msi_check_device(dev, nvec, type);
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}
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return 0;
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}
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int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
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{
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return ppc_md.setup_msi_irqs(dev, nvec, type);
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}
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void arch_teardown_msi_irqs(struct pci_dev *dev)
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{
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return ppc_md.teardown_msi_irqs(dev);
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}
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@ -120,6 +120,14 @@ struct machdep_calls {
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/* To setup PHBs when using automatic OF platform driver for PCI */
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int (*pci_setup_phb)(struct pci_controller *host);
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#ifdef CONFIG_PCI_MSI
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int (*msi_check_device)(struct pci_dev* dev,
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int nvec, int type);
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int (*setup_msi_irqs)(struct pci_dev *dev,
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int nvec, int type);
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void (*teardown_msi_irqs)(struct pci_dev *dev);
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#endif
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void (*restart)(char *cmd);
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void (*power_off)(void);
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void (*halt)(void);
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