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ramips: mt7621: setup memory region for pcie controller memory

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

Signed-off-by: Nikolay Martynov <mar.kolya@gmail.com>

SVN-Revision: 47904
This commit is contained in:
John Crispin 2015-12-17 09:26:35 +00:00
parent e8890c6be0
commit 622e268710
1 changed files with 42 additions and 0 deletions
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42
target/linux/ramips/patches-4.3/0061-mt7621-set-up-pci-memory-region.patch Normal file
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@ -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;