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

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Date:   Mon, 25 Mar 2019 15:09:32 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Murali Karicheri <m-karicheri2@...com>
CC:     Kishon Vijay Abraham I <kishon@...com>,
        Jingoo Han <jingoohan1@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-arm-kernel@...s.com>, Minghuan Lian <minghuan.Lian@....com>,
        Mingkai Hu <mingkai.hu@....com>, Roy Zang <roy.zang@....com>,
        Jesper Nilsson <jesper.nilsson@...s.com>
Subject: [PATCH v3 11/26] PCI: dwc: Fix ATU identification for designware version >= 4.80

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@...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