[PATCH v8 4/5] phy: starfive: Add JH7110 PCIE 2.0 PHY driver
From: Minda Chen
Date: Thu Jun 29 2023 - 03:53:35 EST
Add Starfive JH7110 SoC PCIe 2.0 PHY driver support.
PCIe 2.0 PHY default connect to PCIe controller.
PCIe PHY can connect to USB 3.0 controller.
Signed-off-by: Minda Chen <minda.chen@xxxxxxxxxxxxxxxx>
Reviewed-by: Roger Quadros <rogerq@xxxxxxxxxx>
---
MAINTAINERS | 4 +-
drivers/phy/starfive/Kconfig | 10 ++
drivers/phy/starfive/Makefile | 1 +
drivers/phy/starfive/phy-jh7110-pcie.c | 204 +++++++++++++++++++++++++
4 files changed, 218 insertions(+), 1 deletion(-)
create mode 100644 drivers/phy/starfive/phy-jh7110-pcie.c
diff --git a/MAINTAINERS b/MAINTAINERS
index d2ce89a8d31c..b5d0a9e391bb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20174,10 +20174,12 @@ S: Supported
F: Documentation/devicetree/bindings/watchdog/starfive*
F: drivers/watchdog/starfive-wdt.c
-STARFIVE JH71X0 USB PHY DRIVER
+STARFIVE JH71X0 PCIE AND USB PHY DRIVER
M: Minda Chen <minda.chen@xxxxxxxxxxxxxxxx>
S: Supported
+F: Documentation/devicetree/bindings/phy/starfive,jh7110-pcie-phy.yaml
F: Documentation/devicetree/bindings/phy/starfive,jh7110-usb-phy.yaml
+F: drivers/phy/starfive/phy-jh7110-pcie.c
F: drivers/phy/starfive/phy-jh7110-usb.c
STATIC BRANCH/CALL
diff --git a/drivers/phy/starfive/Kconfig b/drivers/phy/starfive/Kconfig
index 65b5f879bbf9..da9a98cdf7e3 100644
--- a/drivers/phy/starfive/Kconfig
+++ b/drivers/phy/starfive/Kconfig
@@ -3,6 +3,16 @@
# Phy drivers for StarFive platforms
#
+config PHY_STARFIVE_JH7110_PCIE
+ tristate "Starfive JH7110 PCIE 2.0/USB 3.0 PHY support"
+ depends on HAS_IOMEM
+ select GENERIC_PHY
+ help
+ Enable this to support the StarFive PCIe 2.0 PHY,
+ or used as USB 3.0 PHY.
+ If M is selected, the module will be called
+ phy-jh7110-pcie.ko.
+
config PHY_STARFIVE_JH7110_USB
tristate "Starfive JH7110 USB 2.0 PHY support"
depends on USB_SUPPORT
diff --git a/drivers/phy/starfive/Makefile b/drivers/phy/starfive/Makefile
index 52e9a09cc619..1c62d93e3280 100644
--- a/drivers/phy/starfive/Makefile
+++ b/drivers/phy/starfive/Makefile
@@ -1,2 +1,3 @@
# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_PHY_STARFIVE_JH7110_PCIE) += phy-jh7110-pcie.o
obj-$(CONFIG_PHY_STARFIVE_JH7110_USB) += phy-jh7110-usb.o
diff --git a/drivers/phy/starfive/phy-jh7110-pcie.c b/drivers/phy/starfive/phy-jh7110-pcie.c
new file mode 100644
index 000000000000..cbe79c1f59d3
--- /dev/null
+++ b/drivers/phy/starfive/phy-jh7110-pcie.c
@@ -0,0 +1,204 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * StarFive JH7110 PCIe 2.0 PHY driver
+ *
+ * Copyright (C) 2023 StarFive Technology Co., Ltd.
+ * Author: Minda Chen <minda.chen@xxxxxxxxxxxxxxxx>
+ */
+
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/mfd/syscon.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define PCIE_KVCO_LEVEL_OFF 0x28
+#define PCIE_USB3_PHY_PLL_CTL_OFF 0x7c
+#define PCIE_KVCO_TUNE_SIGNAL_OFF 0x80
+#define PCIE_USB3_PHY_ENABLE BIT(4)
+#define PHY_KVCO_FINE_TUNE_LEVEL 0x91
+#define PHY_KVCO_FINE_TUNE_SIGNALS 0xc
+
+#define USB_PDRSTN_SPLIT BIT(17)
+
+#define PCIE_PHY_MODE BIT(20)
+#define PCIE_PHY_MODE_MASK GENMASK(21, 20)
+#define PCIE_USB3_BUS_WIDTH_MASK GENMASK(3, 2)
+#define PCIE_USB3_BUS_WIDTH BIT(3)
+#define PCIE_USB3_RATE_MASK GENMASK(6, 5)
+#define PCIE_USB3_RX_STANDBY_MASK BIT(7)
+#define PCIE_USB3_PHY_ENABLE BIT(4)
+
+struct jh7110_pcie_phy {
+ struct phy *phy;
+ struct regmap *stg_syscon;
+ struct regmap *sys_syscon;
+ void __iomem *regs;
+ u32 sys_phy_connect;
+ u32 stg_pcie_mode;
+ u32 stg_pcie_usb;
+ enum phy_mode mode;
+};
+
+static int phy_usb3_mode_set(struct jh7110_pcie_phy *data)
+{
+ if (!data->stg_syscon || !data->sys_syscon) {
+ dev_err(&data->phy->dev, "doesn't support usb3 mode\n");
+ return -EINVAL;
+ }
+
+ regmap_update_bits(data->stg_syscon, data->stg_pcie_mode,
+ PCIE_PHY_MODE_MASK, PCIE_PHY_MODE);
+ regmap_update_bits(data->stg_syscon, data->stg_pcie_usb,
+ PCIE_USB3_BUS_WIDTH_MASK, 0);
+ regmap_update_bits(data->stg_syscon, data->stg_pcie_usb,
+ PCIE_USB3_PHY_ENABLE, PCIE_USB3_PHY_ENABLE);
+
+ /* Connect usb 3.0 phy mode */
+ regmap_update_bits(data->sys_syscon, data->sys_phy_connect,
+ USB_PDRSTN_SPLIT, 0);
+
+ /* Configuare spread-spectrum mode: down-spread-spectrum */
+ writel(PCIE_USB3_PHY_ENABLE, data->regs + PCIE_USB3_PHY_PLL_CTL_OFF);
+
+ return 0;
+}
+
+static void phy_pcie_mode_set(struct jh7110_pcie_phy *data)
+{
+ u32 val;
+
+ /* default is PCIe mode */
+ if (!data->stg_syscon || !data->sys_syscon)
+ return;
+
+ regmap_update_bits(data->stg_syscon, data->stg_pcie_mode,
+ PCIE_PHY_MODE_MASK, 0);
+ regmap_update_bits(data->stg_syscon, data->stg_pcie_usb,
+ PCIE_USB3_BUS_WIDTH_MASK,
+ PCIE_USB3_BUS_WIDTH);
+ regmap_update_bits(data->stg_syscon, data->stg_pcie_usb,
+ PCIE_USB3_PHY_ENABLE, 0);
+
+ regmap_update_bits(data->sys_syscon, data->sys_phy_connect,
+ USB_PDRSTN_SPLIT, 0);
+
+ val = readl(data->regs + PCIE_USB3_PHY_PLL_CTL_OFF);
+ val &= ~PCIE_USB3_PHY_ENABLE;
+ writel(val, data->regs + PCIE_USB3_PHY_PLL_CTL_OFF);
+}
+
+static void phy_kvco_gain_set(struct jh7110_pcie_phy *phy)
+{
+ /* PCIe Multi-PHY PLL KVCO Gain fine tune settings: */
+ writel(PHY_KVCO_FINE_TUNE_LEVEL, phy->regs + PCIE_KVCO_LEVEL_OFF);
+ writel(PHY_KVCO_FINE_TUNE_SIGNALS, phy->regs + PCIE_KVCO_TUNE_SIGNAL_OFF);
+}
+
+static int jh7110_pcie_phy_set_mode(struct phy *_phy,
+ enum phy_mode mode, int submode)
+{
+ struct jh7110_pcie_phy *phy = phy_get_drvdata(_phy);
+ int ret;
+
+ if (mode == phy->mode)
+ return 0;
+
+ switch (mode) {
+ case PHY_MODE_USB_HOST:
+ case PHY_MODE_USB_DEVICE:
+ case PHY_MODE_USB_OTG:
+ ret = phy_usb3_mode_set(phy);
+ if (ret)
+ return ret;
+ break;
+ case PHY_MODE_PCIE:
+ phy_pcie_mode_set(phy);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ dev_dbg(&_phy->dev, "Changing phy mode to %d\n", mode);
+ phy->mode = mode;
+
+ return 0;
+}
+
+static const struct phy_ops jh7110_pcie_phy_ops = {
+ .set_mode = jh7110_pcie_phy_set_mode,
+ .owner = THIS_MODULE,
+};
+
+static int jh7110_pcie_phy_probe(struct platform_device *pdev)
+{
+ struct jh7110_pcie_phy *phy;
+ struct device *dev = &pdev->dev;
+ struct phy_provider *phy_provider;
+ u32 args[2];
+
+ phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
+ if (!phy)
+ return -ENOMEM;
+
+ phy->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(phy->regs))
+ return PTR_ERR(phy->regs);
+
+ phy->phy = devm_phy_create(dev, NULL, &jh7110_pcie_phy_ops);
+ if (IS_ERR(phy->phy))
+ return dev_err_probe(dev, PTR_ERR(phy->regs),
+ "Failed to map phy base\n");
+
+ phy->sys_syscon =
+ syscon_regmap_lookup_by_phandle_args(pdev->dev.of_node,
+ "starfive,sys-syscon",
+ 1, args);
+
+ if (!IS_ERR_OR_NULL(phy->sys_syscon))
+ phy->sys_phy_connect = args[0];
+ else
+ phy->sys_syscon = NULL;
+
+ phy->stg_syscon =
+ syscon_regmap_lookup_by_phandle_args(pdev->dev.of_node,
+ "starfive,stg-syscon",
+ 2, args);
+
+ if (!IS_ERR_OR_NULL(phy->stg_syscon)) {
+ phy->stg_pcie_mode = args[0];
+ phy->stg_pcie_usb = args[1];
+ } else {
+ phy->stg_syscon = NULL;
+ }
+
+ phy_kvco_gain_set(phy);
+
+ phy_set_drvdata(phy->phy, phy);
+ phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+ return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct of_device_id jh7110_pcie_phy_of_match[] = {
+ { .compatible = "starfive,jh7110-pcie-phy" },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, jh7110_pcie_phy_of_match);
+
+static struct platform_driver jh7110_pcie_phy_driver = {
+ .probe = jh7110_pcie_phy_probe,
+ .driver = {
+ .of_match_table = jh7110_pcie_phy_of_match,
+ .name = "jh7110-pcie-phy",
+ }
+};
+module_platform_driver(jh7110_pcie_phy_driver);
+
+MODULE_DESCRIPTION("StarFive JH7110 PCIe 2.0 PHY driver");
+MODULE_AUTHOR("Minda Chen <minda.chen@xxxxxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
--
2.17.1