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Subject[PATCH v2 3/3] PCI: dra7xx: Enable x2 mode support for dra74x, dra76x and dra72x
Date
dra74x/dra76x and dra72x has separate compatible strings. Add support
for these compatible strings in pci-dra7xx driver to perform syscon
configurations required to get x2 mode working.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
drivers/pci/dwc/pci-dra7xx.c | 90 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 90 insertions(+)

diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
index e77a4ceed74c..3b4427c10228 100644
--- a/drivers/pci/dwc/pci-dra7xx.c
+++ b/drivers/pci/dwc/pci-dra7xx.c
@@ -83,11 +83,15 @@
#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 */
int phy_count; /* DT phy-names count */
struct phy **phy;
+ u32 *b1c0_mask;
int link_gen;
struct irq_domain *irq_domain;
enum dw_pcie_device_mode mode;
@@ -95,6 +99,7 @@ struct dra7xx_pcie {

struct dra7xx_pcie_of_data {
enum dw_pcie_device_mode mode;
+ u32 b1co_mode_sel_mask;
};

#define to_dra7xx_pcie(x) dev_get_drvdata((x)->dev)
@@ -533,6 +538,26 @@ 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 dra726_pcie_rc_of_data = {
+ .b1co_mode_sel_mask = GENMASK(3, 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 dra7xx_pcie_of_data dra726_pcie_ep_of_data = {
+ .b1co_mode_sel_mask = GENMASK(3, 2),
+ .mode = DW_PCIE_EP_TYPE,
+};
+
static const struct of_device_id of_dra7xx_pcie_match[] = {
{
.compatible = "ti,dra7-pcie",
@@ -542,6 +567,22 @@ static const struct of_device_id of_dra7xx_pcie_match[] = {
.compatible = "ti,dra7-pcie-ep",
.data = &dra7xx_pcie_ep_of_data,
},
+ {
+ .compatible = "ti,dra746-pcie-rc",
+ .data = &dra746_pcie_rc_of_data,
+ },
+ {
+ .compatible = "ti,dra726-pcie-rc",
+ .data = &dra726_pcie_rc_of_data,
+ },
+ {
+ .compatible = "ti,dra746-pcie-ep",
+ .data = &dra746_pcie_ep_of_data,
+ },
+ {
+ .compatible = "ti,dra726-pcie-ep",
+ .data = &dra726_pcie_ep_of_data,
+ },
{},
};

@@ -587,6 +628,47 @@ 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,
+ "ti,syscon-lane-conf");
+ if (IS_ERR(pcie_syscon)) {
+ dev_err(dev, "unable to get ti,syscon-lane-conf\n");
+ return -EINVAL;
+ }
+
+ if (of_property_read_u32_index(np, "ti,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, "ti,syscon-lane-sel");
+ if (IS_ERR(pcie_syscon)) {
+ dev_err(dev, "unable to get ti,syscon-lane-sel\n");
+ return -EINVAL;
+ }
+
+ if (of_property_read_u32_index(np, "ti,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;
@@ -608,6 +690,7 @@ 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)
@@ -615,6 +698,7 @@ 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)
@@ -673,6 +757,12 @@ 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
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