[PATCH v3 11/26] PCI: dwc: Fix ATU identification for designware version >= 4.80

Kishon Vijay Abraham I
2019-03-25T09:43:18Z

Synopsys designware version >= 4.80 uses a separate register space
for programming ATU. The current code identifies if there exists a
separate register space by accessing the register address of ATUs
in designware version < 4.80. Accessing this address results in
abort in the case of K2G.

Fix it here by adding "version" member to struct dw_pcie. This should
be set by platform specific drivers and designware core will use it
to identify if the platform has a separate ATU space. For platforms
which hasn't populated the version member, the old method of
identification will still be used.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
drivers/pci/controller/dwc/pcie-designware.c | 14 ++++++++------
drivers/pci/controller/dwc/pcie-designware.h | 1 +
2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index a14ca00f72aa..4e2f7946da89 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -358,13 +358,15 @@ void dw_pcie_setup(struct dw_pcie *pci)
struct device *dev = pci->dev;
struct device_node *np = dev->of_node;

- /* Get iATU unroll support */
- pci->iatu_unroll_enabled = dw_pcie_iatu_unroll_enabled(pci);
- dev_dbg(pci->dev, "iATU unroll: %s\n",
- pci->iatu_unroll_enabled ? "enabled" : "disabled");
+ if (pci->version >= 0x480A || (!pci->version &&
+ dw_pcie_iatu_unroll_enabled(pci))) {
+ pci->iatu_unroll_enabled = true;
+ if (!pci->atu_base)
+ pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET;
+ }
+ dev_dbg(pci->dev, "iATU unroll: %s\n", pci->iatu_unroll_enabled ?
+ "enabled" : "disabled");

- if (pci->iatu_unroll_enabled && !pci->atu_base)
- pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET;

ret = of_property_read_u32(np, "num-lanes", &lanes);
if (ret)
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index ca3a3190a6f5..90a5b1215344 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -234,6 +234,7 @@ struct dw_pcie {
struct pcie_port pp;
struct dw_pcie_ep ep;
const struct dw_pcie_ops *ops;
+ unsigned int version;
};

#define to_dw_pcie_from_pp(port) container_of((port), struct dw_pcie, pp)
--
2.17.1