powerpc/fsl_msi: enable msi sharing through AMP OSes

Make a single PCIe MSI bank shareable through CAMP OSes. The number of
MSI used by each core can be configured by dts file.

Signed-off-by: Zhao Chenhui <b26998@freescale.com>
Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/arch/powerpc/sysdev/fsl_msi.c b/arch/powerpc/sysdev/fsl_msi.c
index efffcbd190a1..1ab703915972 100644
--- a/arch/powerpc/sysdev/fsl_msi.c
+++ b/arch/powerpc/sysdev/fsl_msi.c
@@ -261,6 +261,8 @@ static int __devinit fsl_of_msi_probe(struct of_device *dev,
         const u32 *p;
         struct fsl_msi_feature *features = match->data;
         struct fsl_msi_cascade_data *cascade_data = NULL;
+        int len;
+        u32 offset;
 
         printk(KERN_DEBUG "Setting up Freescale MSI support\n");
 
@@ -320,6 +322,10 @@ static int __devinit fsl_of_msi_probe(struct of_device *dev,
                 err = -EINVAL;
                 goto error_out;
         }
+        offset = 0;
+        p = of_get_property(dev->node, "msi-available-ranges", &len);
+        if (p)
+                offset = *p / IRQS_PER_MSI_REG;
 
         count /= sizeof(u32);
         for (i = 0; i < count / 2; i++) {
@@ -336,7 +342,7 @@ static int __devinit fsl_of_msi_probe(struct of_device *dev,
                                 err = -ENOMEM;
                                 goto error_out;
                         }
-                        cascade_data->index = i;
+                        cascade_data->index = i + offset;
                         cascade_data->msi_data = msi;
                         set_irq_data(virt_msir, (void *)cascade_data);
                         set_irq_chained_handler(virt_msir, fsl_msi_cascade);