From: Thierry Reding <treding@xxxxxxxxxx>
Track the offsets of the bus -> CPU mapping for I/O and memory. This is
cosmetic for current Tegra chips because the offset is always 0. But to
properly support legacy use-cases, like VGA, this would be needed so
that PCI bus addresses can be relocated.
While at it, also request the I/O resource both in physical memory and
I/O space to make /proc/iomem consistent, as well as add the I/O region
to the list of host bridge resources.
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
drivers/pci/host/pci-tegra.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index 82d7ad3a1c3a..f6fc54b48606 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -281,6 +281,11 @@ struct tegra_pcie {
struct resource prefetch;
struct resource busn;
+ struct {
+ resource_size_t mem;
+ resource_size_t io;
+ } offset;
+
struct clk *pex_clk;
struct clk *afi_clk;
struct clk *pll_e;
@@ -614,6 +619,17 @@ static int tegra_pcie_setup(int nr, struct pci_sys_data *sys)
struct tegra_pcie *pcie = sys_to_pcie(sys);
int err;
+ sys->mem_offset = pcie->offset.mem;
+ sys->io_offset = pcie->offset.io;
+
+ err = devm_request_resource(pcie->dev, &pcie->all, &pcie->io);
+ if (err < 0)
+ return err;
+
+ err = devm_request_resource(pcie->dev, &ioport_resource, &pcie->pio);
+ if (err < 0)
+ return err;
+
err = devm_request_resource(pcie->dev, &pcie->all, &pcie->mem);
if (err < 0)
return err;
@@ -622,6 +638,7 @@ static int tegra_pcie_setup(int nr, struct pci_sys_data *sys)
if (err)
return err;
+ pci_add_resource_offset(&sys->resources, &pcie->pio, sys->io_offset);
pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
pci_add_resource_offset(&sys->resources, &pcie->prefetch,
sys->mem_offset);
@@ -1729,6 +1746,9 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
switch (res.flags & IORESOURCE_TYPE_BITS) {
case IORESOURCE_IO:
+ /* Track the bus -> CPU I/O mapping offset. */
+ pcie->offset.io = res.start - range.pci_addr;
+
memcpy(&pcie->pio, &res, sizeof(res));
pcie->pio.name = np->full_name;
@@ -1749,6 +1769,14 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
break;
case IORESOURCE_MEM:
+ /*
+ * Track the bus -> CPU memory mapping offset. This
+ * assumes that the prefetchable and non-prefetchable
+ * regions will be the last of type IORESOURCE_MEM in
+ * the ranges property.
+ * */
+ pcie->offset.mem = res.start - range.pci_addr;
+
if (res.flags & IORESOURCE_PREFETCH) {
memcpy(&pcie->prefetch, &res, sizeof(res));
pcie->prefetch.name = "prefetchable";
--
2.7.1
--
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