ssb: Fix support for PCI devices behind a SSB->PCI bridge

We must pin all resources and make sure the PCI subsystem
won't relocate us, as the addresses are hardwired into hardware.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 12 insertions, 5 deletions

diff --git a/drivers/ssb/driver_pcicore.c b/drivers/ssb/driver_pcicore.c
index 059452fbb168..6d99a9880055 100644
--- a/drivers/ssb/driver_pcicore.c
+++ b/drivers/ssb/driver_pcicore.c
@@ -79,6 +79,7 @@ int pcibios_plat_dev_init(struct pci_dev *d)
                         base = &ssb_pcicore_pcibus_iobase;
                 else
                         base = &ssb_pcicore_pcibus_membase;
+                res->flags |= IORESOURCE_PCI_FIXED;
                 if (res->end) {
                         size = res->end - res->start + 1;
                         if (*base & (size - 1))
@@ -101,10 +102,12 @@ int pcibios_plat_dev_init(struct pci_dev *d)
 
 static void __init ssb_fixup_pcibridge(struct pci_dev *dev)
 {
+        u8 lat;
+
         if (dev->bus->number != 0 || PCI_SLOT(dev->devfn) != 0)
                 return;
 
-        ssb_printk(KERN_INFO "PCI: fixing up bridge\n");
+        ssb_printk(KERN_INFO "PCI: Fixing up bridge %s\n", pci_name(dev));
 
         /* Enable PCI bridge bus mastering and memory space */
         pci_set_master(dev);
@@ -114,7 +117,10 @@ static void __init ssb_fixup_pcibridge(struct pci_dev *dev)
         pci_write_config_dword(dev, SSB_BAR1_CONTROL, 3);
 
         /* Make sure our latency is high enough to handle the devices behind us */
-        pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xa8);
+        lat = 168;
+        ssb_printk(KERN_INFO "PCI: Fixing latency timer of device %s to %u\n",
+                   pci_name(dev), lat);
+        pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
 }
 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ssb_fixup_pcibridge);
 
@@ -294,14 +300,14 @@ static struct resource ssb_pcicore_mem_resource = {
         .name   = "SSB PCIcore external memory",
         .start  = SSB_PCI_DMA,
         .end    = SSB_PCI_DMA + SSB_PCI_DMA_SZ - 1,
-        .flags  = IORESOURCE_MEM,
+        .flags  = IORESOURCE_MEM | IORESOURCE_PCI_FIXED,
 };
 
 static struct resource ssb_pcicore_io_resource = {
         .name   = "SSB PCIcore external I/O",
         .start  = 0x100,
         .end    = 0x7FF,
-        .flags  = IORESOURCE_IO,
+        .flags  = IORESOURCE_IO | IORESOURCE_PCI_FIXED,
 };
 
 static struct pci_controller ssb_pcicore_controller = {
@@ -368,7 +374,8 @@ static void ssb_pcicore_init_hostmode(struct ssb_pcicore *pc)
         /* Ok, ready to run, register it to the system.
          * The following needs change, if we want to port hostmode
          * to non-MIPS platform. */
-        set_io_port_base((unsigned long)ioremap_nocache(SSB_PCI_MEM, 0x04000000));
+        ssb_pcicore_controller.io_map_base = (unsigned long)ioremap_nocache(SSB_PCI_MEM, 0x04000000);
+        set_io_port_base(ssb_pcicore_controller.io_map_base);
         /* Give some time to the PCI controller to configure itself with the new
          * values. Not waiting at this point causes crashes of the machine. */
         mdelay(10);