[PATCH 4/4] PCI: dwc: pci-dra7xx: Enable x2 mode support

[Kishon Vijay Abraham I]

Perform syscon configurations to get x2 mode to working in dra74x
(and dra76x).

Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
Signed-off-by: Sekhar Nori <nsekhar@xxxxxx>
---
 drivers/pci/dwc/pci-dra7xx.c | 68 ++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 66 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
index 78a87a8f1362..a43c904310f3 100644
--- a/drivers/pci/dwc/pci-dra7xx.c
+++ b/drivers/pci/dwc/pci-dra7xx.c
@@ -21,6 +21,7 @@
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/of_pci.h>
+#include <linux/of_platform.h>
 #include <linux/pci.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
@@ -83,6 +84,9 @@
 #define MSI_REQ_GRANT					BIT(0)
 #define MSI_VECTOR_SHIFT				7
 
+#define PCIE_1LANE_2LANE_SELECTION			BIT(13)
+#define PCIE_B1C0_MODE_SEL				BIT(2)
+
 struct dra7xx_pcie {
 	struct dw_pcie		*pci;
 	void __iomem		*base;		/* DT ti_conf */
@@ -95,6 +99,10 @@ struct dra7xx_pcie {
 
 struct dra7xx_pcie_of_data {
 	enum dw_pcie_device_mode mode;
+	u32 b1co_mode_sel_mask;
+};
+
+struct dra7xx_pcie_data {
 };
 
 #define to_dra7xx_pcie(x)	dev_get_drvdata((x)->dev)
@@ -533,6 +541,16 @@ static const struct dra7xx_pcie_of_data dra7xx_pcie_ep_of_data = {
 	.mode = DW_PCIE_EP_TYPE,
 };
 
+static const struct dra7xx_pcie_of_data dra746_pcie_rc_of_data = {
+	.b1co_mode_sel_mask = BIT(2),
+	.mode = DW_PCIE_RC_TYPE,
+};
+
+static const struct dra7xx_pcie_of_data dra746_pcie_ep_of_data = {
+	.b1co_mode_sel_mask = BIT(2),
+	.mode = DW_PCIE_EP_TYPE,
+};
+
 static const struct of_device_id of_dra7xx_pcie_match[] = {
 	{
 		.compatible = "ti,dra7-pcie",
@@ -544,11 +562,11 @@ static const struct of_device_id of_dra7xx_pcie_match[] = {
 	},
 	{
 		.compatible = "ti,dra746-pcie-rc",
-		.data = &dra7xx_pcie_rc_of_data,
+		.data = &dra746_pcie_rc_of_data,
 	},
 	{
 		.compatible = "ti,dra746-pcie-ep",
-		.data = &dra7xx_pcie_ep_of_data,
+		.data = &dra746_pcie_ep_of_data,
 	},
 	{
 		.compatible = "ti,dra726-pcie-rc",
@@ -603,6 +621,44 @@ static int dra7xx_pcie_ep_unaligned_memaccess(struct device *dev)
 	return ret;
 }
 
+static int dra7xx_pcie_configure_two_lane(struct device *dev,
+					  u32 b1co_mode_sel_mask)
+{
+	struct device_node *np = dev->of_node;
+	struct regmap *pcie_syscon;
+	unsigned int pcie_reg;
+
+	pcie_syscon = syscon_regmap_lookup_by_phandle(np, "syscon-lane-conf");
+	if (IS_ERR(pcie_syscon)) {
+		dev_err(dev, "unable to get syscon-lane-conf\n");
+		return -EINVAL;
+	}
+
+	if (of_property_read_u32_index(np, "syscon-lane-conf", 1, &pcie_reg)) {
+		dev_err(dev, "couldn't get lane configuration reg offset\n");
+		return -EINVAL;
+	}
+
+	regmap_update_bits(pcie_syscon, pcie_reg, PCIE_1LANE_2LANE_SELECTION,
+			   PCIE_1LANE_2LANE_SELECTION);
+
+	pcie_syscon = syscon_regmap_lookup_by_phandle(np, "syscon-lane-sel");
+	if (IS_ERR(pcie_syscon)) {
+		dev_err(dev, "unable to get syscon-lane-sel\n");
+		return -EINVAL;
+	}
+
+	if (of_property_read_u32_index(np, "syscon-lane-sel", 1, &pcie_reg)) {
+		dev_err(dev, "couldn't get lane selection reg offset\n");
+		return -EINVAL;
+	}
+
+	regmap_update_bits(pcie_syscon, pcie_reg, b1co_mode_sel_mask,
+			   PCIE_B1C0_MODE_SEL);
+
+	return 0;
+}
+
 static int __init dra7xx_pcie_probe(struct platform_device *pdev)
 {
 	u32 reg;
@@ -624,6 +680,7 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
 	const struct of_device_id *match;
 	const struct dra7xx_pcie_of_data *data;
 	enum dw_pcie_device_mode mode;
+	u32 b1co_mode_sel_mask;
 
 	match = of_match_device(of_match_ptr(of_dra7xx_pcie_match), dev);
 	if (!match)
@@ -631,6 +688,7 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
 
 	data = (struct dra7xx_pcie_of_data *)match->data;
 	mode = (enum dw_pcie_device_mode)data->mode;
+	b1co_mode_sel_mask = data->b1co_mode_sel_mask;
 
 	dra7xx = devm_kzalloc(dev, sizeof(*dra7xx), GFP_KERNEL);
 	if (!dra7xx)
@@ -689,6 +747,12 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
 	dra7xx->pci = pci;
 	dra7xx->phy_count = phy_count;
 
+	if (phy_count == 2) {
+		ret = dra7xx_pcie_configure_two_lane(dev, b1co_mode_sel_mask);
+		if (ret < 0)
+			goto err_link;
+	}
+
 	ret = dra7xx_pcie_enable_phy(dra7xx);
 	if (ret) {
 		dev_err(dev, "failed to enable phy\n");
-- 
2.11.0