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authorGanesan Ramalingam <ganesanr@netlogicmicro.com>2011-08-23 13:36:10 +0530
committerRalf Baechle <ralf@linux-mips.org>2011-12-07 22:04:54 +0000
commitf32671a867523e830887983891d99d3ac4842ccf (patch)
treed9c4c35b9a0ddb8cea352752dd5e6152b977ffc1 /arch/mips/pci
parentb66f953cd00e7c309c33ea35acd95b13a027050f (diff)
MIPS: Netlogic: Add basic MSI support for XLR/XLS
Add basic support for MSI. Signed-off-by: Ganesan Ramalingam <ganesanr@netlogicmicro.com> Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/2730/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/pci')
-rw-r--r--arch/mips/pci/pci-xlr.c51
1 files changed, 50 insertions, 1 deletions
diff --git a/arch/mips/pci/pci-xlr.c b/arch/mips/pci/pci-xlr.c
index 38fece16c43..87404d0034d 100644
--- a/arch/mips/pci/pci-xlr.c
+++ b/arch/mips/pci/pci-xlr.c
@@ -36,12 +36,16 @@
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>
+#include <linux/msi.h>
#include <linux/mm.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
#include <linux/console.h>
#include <asm/io.h>
#include <asm/netlogic/interrupt.h>
+#include <asm/netlogic/xlr/msidef.h>
#include <asm/netlogic/xlr/iomap.h>
#include <asm/netlogic/xlr/pic.h>
#include <asm/netlogic/xlr/xlr.h>
@@ -150,7 +154,7 @@ struct pci_controller nlm_pci_controller = {
.io_offset = 0x00000000UL,
};
-int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+static int get_irq_vector(const struct pci_dev *dev)
{
if (!nlm_chip_is_xls())
return PIC_PCIX_IRQ; /* for XLR just one IRQ*/
@@ -182,6 +186,51 @@ int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return 0;
}
+#ifdef CONFIG_PCI_MSI
+void destroy_irq(unsigned int irq)
+{
+ /* nothing to do yet */
+}
+
+void arch_teardown_msi_irq(unsigned int irq)
+{
+ destroy_irq(irq);
+}
+
+int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
+{
+ struct msi_msg msg;
+ int irq, ret;
+
+ irq = get_irq_vector(dev);
+ if (irq <= 0)
+ return 1;
+
+ msg.address_hi = MSI_ADDR_BASE_HI;
+ msg.address_lo = MSI_ADDR_BASE_LO |
+ MSI_ADDR_DEST_MODE_PHYSICAL |
+ MSI_ADDR_REDIRECTION_CPU;
+
+ msg.data = MSI_DATA_TRIGGER_EDGE |
+ MSI_DATA_LEVEL_ASSERT |
+ MSI_DATA_DELIVERY_FIXED;
+
+ ret = irq_set_msi_desc(irq, desc);
+ if (ret < 0) {
+ destroy_irq(irq);
+ return ret;
+ }
+
+ write_msi_msg(irq, &msg);
+ return 0;
+}
+#endif
+
+int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+ return get_irq_vector(dev);
+}
+
/* Do platform specific device initialization at pci_enable_device() time */
int pcibios_plat_dev_init(struct pci_dev *dev)
{