ramips: mt7621: setup memory region for pcie controller memory

Only compile tested since I do not have any hardware with
devices on pcie bus.

Signed-off-by: Nikolay Martynov <mar.kolya@gmail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@47904 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/ramips/patches-4.3/0061-mt7621-set-up-pci-memory-region.patch b/target/linux/ramips/patches-4.3/0061-mt7621-set-up-pci-memory-region.patch
new file mode 100644 (file)
index 0000000..e6338a9
--- /dev/null
+++ b/target/linux/ramips/patches-4.3/0061-mt7621-set-up-pci-memory-region.patch
@@ -0,0 +1,42 @@
+--- a/arch/mips/pci/pci-mt7621.c
++++ b/arch/mips/pci/pci-mt7621.c
+@@ -46,6 +46,7 @@
+ #include <linux/version.h>
+ #include <asm/pci.h>
+ #include <asm/io.h>
++#include <asm/mips-cm.h>
+ #include <linux/init.h>
+ #include <linux/module.h>
+ #include <linux/delay.h>
+@@ -553,6 +554,23 @@ set_phy_for_ssc(void)
+ #endif
+ }
+ 
++void setup_cm_memory_region(struct resource *mem_resource)
++{
++      resource_size_t mask;
++      if (mips_cm_numiocu()) {
++              /* FIXME: hardware doesn't accept mask values with 1s after
++                 0s (e.g. 0xffef), so it would be great to warn if that's
++                 about to happen */
++              mask = ~(mem_resource->end - mem_resource->start);
++
++              write_gcr_reg1_base(mem_resource->start);
++              write_gcr_reg1_mask(mask | CM_GCR_REGn_MASK_CMTGT_IOCU0);
++              printk("PCI coherence region base: 0x%08lx, mask/settings: 0x%08lx\n",
++                     read_gcr_reg1_base(),
++                     read_gcr_reg1_mask());
++      }
++}
++
+ static int mt7621_pci_probe(struct platform_device *pdev)
+ {
+       unsigned long val = 0;
+@@ -780,6 +798,7 @@ pcie(2/1/0) link status    pcie2_num       pcie1_
+       }
+ 
+       pci_load_of_ranges(&mt7621_controller, pdev->dev.of_node);
++      setup_cm_memory_region(mt7621_controller.mem_resource);
+       register_pci_controller(&mt7621_controller);
+       return 0;
+