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Date: Mon, 28 Sep 2015 18:27:38 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: <bhelgaas@...gle.com>
CC: <linux-omap@...r.kernel.org>, <linux-pci@...r.kernel.org>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<nsekhar@...com>, <kishon@...com>
Subject: [RFC PATCH 2/2] pci: host: pci-dra7xx: Enable x2 mode support
Perform syscon configurations to get x2 mode to working in DRA74x and
DRA72x. Also add a new compatible string to dfferentiate
DRA72x and DRA74x, since b1c0 mask is different for both these platforms.
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
Documentation/devicetree/bindings/pci/ti-pci.txt | 7 +-
drivers/pci/host/pci-dra7xx.c | 81 +++++++++++++++++++++-
2 files changed, 86 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/pci/ti-pci.txt b/Documentation/devicetree/bindings/pci/ti-pci.txt
index 60e2516..1ae1705 100644
--- a/Documentation/devicetree/bindings/pci/ti-pci.txt
+++ b/Documentation/devicetree/bindings/pci/ti-pci.txt
@@ -1,7 +1,8 @@
TI PCI Controllers
PCIe Designware Controller
- - compatible: Should be "ti,dra7-pcie""
+ - compatible: Should be "ti,dra7-pcie" for DRA74x
+ Should be "ti,dra72-pcie" for DRA72x
- reg : Two register ranges as listed in the reg-names property
- reg-names : The first entry must be "ti-conf" for the TI specific registers
The second entry must be "rc-dbics" for the designware pcie
@@ -14,6 +15,10 @@ PCIe Designware Controller
where <X> is the instance number of the pcie from the HW spec.
- interrupts : Two interrupt entries must be specified. The first one is for
main interrupt line and the second for MSI interrupt line.
+ - syscon-lane-conf : phandle/offset pair. Phandle to the system control module and the
+ register offset to specify 1 lane or 2 lane.
+ - syscon-lane-sel : phandle/offset pair. Phandle to the system control module and the
+ register offset to specify lane selection.
- #address-cells,
#size-cells,
#interrupt-cells,
diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
index e15b2e2..fb23a58 100644
--- a/drivers/pci/host/pci-dra7xx.c
+++ b/drivers/pci/host/pci-dra7xx.c
@@ -22,8 +22,11 @@
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
+#include <linux/of_platform.h>
#include <linux/resource.h>
#include <linux/types.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
#include "pcie-designware.h"
@@ -63,14 +66,22 @@
#define PCIECTRL_DRA7XX_CONF_PHY_CS 0x010C
#define LINK_UP BIT(16)
+#define PCIE_1LANE_2LANE_SELECTION BIT(13)
+#define PCIE_B1C0_MODE_SEL BIT(2)
+
struct dra7xx_pcie {
void __iomem *base;
+ u32 *b1c0_mask;
struct phy **phy;
int lanes;
struct device *dev;
struct pcie_port pp;
};
+struct dra7xx_pcie_data {
+ u32 b1co_mode_sel_mask;
+};
+
#define to_dra7xx_pcie(x) container_of((x), struct dra7xx_pcie, pp)
static inline u32 dra7xx_pcie_readl(struct dra7xx_pcie *pcie, u32 offset)
@@ -322,6 +333,57 @@ static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
return 0;
}
+static const struct of_device_id of_dra7xx_pcie_match[];
+
+static int dra7xx_pcie_configure_two_lane(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct regmap *pcie_syscon;
+ unsigned int pcie_reg;
+ struct dra7xx_pcie_data *data;
+ const struct of_device_id *match;
+
+ match = of_match_device(of_dra7xx_pcie_match, dev);
+ if (!match)
+ return -EINVAL;
+
+ data = (struct dra7xx_pcie_data *)match->data;
+ if (!data) {
+ dev_err(dev, "no b1c0 mask data\n");
+ return -EINVAL;
+ }
+
+ 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, data->b1co_mode_sel_mask,
+ PCIE_B1C0_MODE_SEL);
+
+ return 0;
+}
+
static int __init dra7xx_pcie_probe(struct platform_device *pdev)
{
u32 reg;
@@ -386,6 +448,14 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
phy_exit(phy[i]);
goto err_phy;
}
+
+ if (i == 1) {
+ ret = dra7xx_pcie_configure_two_lane(dev);
+ if (ret < 0) {
+ i++;
+ goto err_phy;
+ }
+ }
}
dra7xx->base = base;
@@ -541,8 +611,17 @@ static const struct dev_pm_ops dra7xx_pcie_pm_ops = {
dra7xx_pcie_resume_noirq)
};
+static const struct dra7xx_pcie_data dra7_pcie_data = {
+ .b1co_mode_sel_mask = BIT(2),
+};
+
+static const struct dra7xx_pcie_data dra72_pcie_data = {
+ .b1co_mode_sel_mask = GENMASK(2, 3),
+};
+
static const struct of_device_id of_dra7xx_pcie_match[] = {
- { .compatible = "ti,dra7-pcie", },
+ { .compatible = "ti,dra7-pcie", .data = &dra7_pcie_data },
+ { .compatible = "ti,dra72-pcie", .data = &dra72_pcie_data },
{},
};
MODULE_DEVICE_TABLE(of, of_dra7xx_pcie_match);
--
1.7.9.5
--
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