This patch adds a generic PCIe PHY driver for Mediatek SoCs.
Signed-off-by: Ryder Lee <ryder.lee@xxxxxxxxxxxx>
---
drivers/phy/Kconfig | 8 ++
drivers/phy/Makefile | 1 +
drivers/phy/phy-mediatek-pcie.c | 290 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 299 insertions(+)
create mode 100644 drivers/phy/phy-mediatek-pcie.c
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index afaf7b6..220f12f 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -241,6 +241,14 @@ config PHY_MT65XX_USB3
Say 'Y' here to add support for Mediatek USB3.0 PHY driver,
it supports multiple usb2.0 and usb3.0 ports.
+config PHY_MEDIATEK_PCIE
+ tristate "Mediatek PCIe PHY driver"
+ depends on ARCH_MEDIATEK && OF
+ select GENERIC_PHY
+ select MFD_SYSCON
+ help
+ Say 'Y' here to add support for generic Mediatek PCIe PHY driver.
+
config PHY_HI6220_USB
tristate "hi6220 USB PHY support"
depends on (ARCH_HISI && ARM64) || COMPILE_TEST
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index f8047b4..b337ae9 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_PHY_EXYNOS5250_SATA) += phy-exynos5250-sata.o
obj-$(CONFIG_PHY_HIX5HD2_SATA) += phy-hix5hd2-sata.o
obj-$(CONFIG_PHY_HI6220_USB) += phy-hi6220-usb.o
obj-$(CONFIG_PHY_MT65XX_USB3) += phy-mt65xx-usb3.o
+obj-$(CONFIG_PHY_MEDIATEK_PCIE) += phy-mediatek-pcie.o
obj-$(CONFIG_PHY_SUN4I_USB) += phy-sun4i-usb.o
obj-$(CONFIG_PHY_SUN9I_USB) += phy-sun9i-usb.o
obj-$(CONFIG_PHY_SAMSUNG_USB2) += phy-exynos-usb2.o
diff --git a/drivers/phy/phy-mediatek-pcie.c b/drivers/phy/phy-mediatek-pcie.c
new file mode 100644
index 0000000..7c6f5aa
--- /dev/null
+++ b/drivers/phy/phy-mediatek-pcie.c
@@ -0,0 +1,290 @@
+/*
+ * Copyright (c) 2017 MediaTek Inc.
+ * Author: Ryder Lee <ryder.lee@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+/* Offsets of sub-segment in each port registers */
+#define PCIE_SIFSLV_PHYD_BANK2_BASE 0xa00
+#define SSUSB_SIFSLV_PHYA_BASE 0xb00
+#define SSUSB_SIFSLV_PHYA_DA_BASE 0xc00
+
+/*
+ * RX detection stable - 1 scale represent 8 reference cycles
+ * cover reference clock from 1M~100MHz, 7us~40us
+ */
+#define B2_PHYD_RXDET1 (PCIE_SIFSLV_PHYD_BANK2_BASE + 0x28)
+#define RG_SSUSB_RXDET_STB2 GENMASK(17, 9)
+#define RG_SSUSB_RXDET_STB2_VAL(x) ((0x1ff & (x)) << 9)
+
+#define B2_PHYD_RXDET2 (PCIE_SIFSLV_PHYD_BANK2_BASE + 0x2c)
+#define RG_SSUSB_RXDET_STB2_P3 GENMASK(8, 0)
+#define RG_SSUSB_RXDET_STB2_P3_VAL(x) (0x1ff & (x))
+
+#define U3_PHYA_REG0 (SSUSB_SIFSLV_PHYA_BASE + 0x00)
+#define RG_PCIE_CLKDRV_OFFSET GENMASK(3, 1)
+#define RG_PCIE_CLKDRV_OFFSET_VAL(x) ((0x3 & (x)) << 2)
+
+#define U3_PHYA_REG1 (SSUSB_SIFSLV_PHYA_BASE + 0x04)
+#define RG_PCIE_CLKDRV_AMP GENMASK(31, 29)
+#define RG_PCIE_CLKDRV_AMP_VAL(x) ((0x7 & (x)) << 29)
+
+#define DA_SSUSB_CDR_REFCK_SEL (SSUSB_SIFSLV_PHYA_DA_BASE + 0x00)
+#define RG_SSUSB_XTAL_EXT_PE1H GENMASK(13, 12)
+#define RG_SSUSB_XTAL_EXT_PE1H_VAL(x) ((0x3 & (x)) << 12)
+#define RG_SSUSB_XTAL_EXT_PE2H GENMASK(17, 16)
+#define RG_SSUSB_XTAL_EXT_PE2H_VAL(x) ((0x3 & (x)) << 16)
+
+#define DA_SSUSB_PLL_IC (SSUSB_SIFSLV_PHYA_DA_BASE + 0x0c)
+#define RG_SSUSB_PLL_IC_PE2H GENMASK(15, 12)
+#define RG_SSUSB_PLL_IC_PE2H_VAL(x) ((0xf & (x)) << 12)
+#define RG_SSUSB_PLL_BR_PE2H GENMASK(29, 28)
+#define RG_SSUSB_PLL_BR_PE2H_VAL(x) ((0x3 & (x)) << 28)
+
+#define DA_SSUSB_PLL_BC (SSUSB_SIFSLV_PHYA_DA_BASE + 0x08)
+#define RG_SSUSB_PLL_DIVEN_PE2H GENMASK(21, 19)
+#define RG_SSUSB_PLL_BC_PE2H GENMASK(7, 6)
+#define RG_SSUSB_PLL_BC_PE2H_VAL(x) ((0x3 & (x)) << 6)
+
+#define DA_SSUSB_PLL_IR (SSUSB_SIFSLV_PHYA_DA_BASE + 0x10)
+#define RG_SSUSB_PLL_IR_PE2H GENMASK(19, 16)
+#define RG_SSUSB_PLL_IR_PE2H_VAL(x) ((0xf & (x)) << 16)
+
+#define DA_SSUSB_PLL_BP (SSUSB_SIFSLV_PHYA_DA_BASE + 0x14)
+#define RG_SSUSB_PLL_BP_PE2H GENMASK(19, 16)
+#define RG_SSUSB_PLL_BP_PE2H_VAL(x) ((0xf & (x)) << 16)
+
+#define DA_SSUSB_PLL_SSC_DELTA1_REG20 (SSUSB_SIFSLV_PHYA_DA_BASE + 0x3c)
+#define RG_SSUSB_PLL_SSC_DELTA1_PE2H GENMASK(31, 16)
+#define RG_SSUSB_PLL_SSC_DELTA1_PE2H_VAL(x) ((0xffff & (x)) << 16)
+
+#define DA_SSUSB_PLL_SSC_DELTA_REG25 (SSUSB_SIFSLV_PHYA_DA_BASE + 0x48)
+#define RG_SSUSB_PLL_SSC_DELTA_PE2H GENMASK(15, 0)
+#define RG_SSUSB_PLL_SSC_DELTA_PE2H_VAL(x) (0xffff & (x))
+
+#define HIF_SYSCFG1 0x14
+#define HIF_SYSCFG1_PHY2_MASK (0x3 << 20)
+
+struct mtk_pcie_phy {
+ struct device *dev;
+ void __iomem *base;
+ struct regmap *hif;
+ struct clk *phya_ref;
+ struct phy *phy;
+};
+
+static inline u32 phy_read(struct mtk_pcie_phy *phy, u32 reg)
+{
+ return readl(phy->base + reg);
+}
+
+static inline void phy_write(struct mtk_pcie_phy *phy, u32 val, u32 reg)
+{
+ writel(val, phy->base + reg);
+}
+
+static int mtk_pcie_phy_power_on(struct phy *phy)
+{
+ struct mtk_pcie_phy *mtk_phy = phy_get_drvdata(phy);
+ int err;
+ u32 val;
+
+ /* enable PCIe mode if needed */
+ if (mtk_phy->hif)
+ regmap_update_bits(mtk_phy->hif, HIF_SYSCFG1,
+ HIF_SYSCFG1_PHY2_MASK, 0);
+
+ err = clk_prepare_enable(mtk_phy->phya_ref);
+ if (err) {
+ dev_err(mtk_phy->dev, "failed to enable PCIe phy clock\n");
+ return err;
+ }
+
+ val = phy_read(mtk_phy, DA_SSUSB_CDR_REFCK_SEL);
+ val &= ~(RG_SSUSB_XTAL_EXT_PE1H | RG_SSUSB_XTAL_EXT_PE2H);
+ val |= RG_SSUSB_XTAL_EXT_PE1H_VAL(0x2) |
+ RG_SSUSB_XTAL_EXT_PE2H_VAL(0x2);
+ phy_write(mtk_phy, val, DA_SSUSB_CDR_REFCK_SEL);
+
+ /* ref clk drive */
+ val = phy_read(mtk_phy, U3_PHYA_REG1);
+ val &= ~RG_PCIE_CLKDRV_AMP;
+ val |= RG_PCIE_CLKDRV_AMP_VAL(0x4);
+ phy_write(mtk_phy, val, U3_PHYA_REG1);
+
+ val = phy_read(mtk_phy, U3_PHYA_REG0);
+ val &= ~RG_PCIE_CLKDRV_OFFSET;
+ val |= RG_PCIE_CLKDRV_OFFSET_VAL(0x1);
+ phy_write(mtk_phy, val, U3_PHYA_REG0);
+
+ /* SSC delta -5000ppm */
+ val = phy_read(mtk_phy, DA_SSUSB_PLL_SSC_DELTA1_REG20);
+ val &= ~RG_SSUSB_PLL_SSC_DELTA1_PE2H;
+ val |= RG_SSUSB_PLL_SSC_DELTA1_PE2H_VAL(0x3c);
+ phy_write(mtk_phy, val, DA_SSUSB_PLL_SSC_DELTA1_REG20);
+
+ val = phy_read(mtk_phy, DA_SSUSB_PLL_SSC_DELTA_REG25);
+ val &= ~RG_SSUSB_PLL_SSC_DELTA_PE2H;
+ val |= RG_SSUSB_PLL_SSC_DELTA_PE2H_VAL(0x36);
+ phy_write(mtk_phy, val, DA_SSUSB_PLL_SSC_DELTA_REG25);
+
+ /* change pll BW 0.6M */
+ val = phy_read(mtk_phy, DA_SSUSB_PLL_IC);
+ val &= ~RG_SSUSB_PLL_BR_PE2H;
+ val |= RG_SSUSB_PLL_BR_PE2H_VAL(0x1);
+ phy_write(mtk_phy, val, DA_SSUSB_PLL_IC);
+
+ val = phy_read(mtk_phy, DA_SSUSB_PLL_BC);
+ val &= ~(RG_SSUSB_PLL_DIVEN_PE2H | RG_SSUSB_PLL_BC_PE2H);
+ val |= RG_SSUSB_PLL_BC_PE2H_VAL(0x3);
+ phy_write(mtk_phy, val, DA_SSUSB_PLL_BC);
+
+ val = phy_read(mtk_phy, DA_SSUSB_PLL_IR);
+ val &= ~RG_SSUSB_PLL_IR_PE2H;
+ val |= RG_SSUSB_PLL_IR_PE2H_VAL(0x2);
+ phy_write(mtk_phy, val, DA_SSUSB_PLL_IR);
+
+ val = phy_read(mtk_phy, DA_SSUSB_PLL_IC);
+ val &= ~RG_SSUSB_PLL_IC_PE2H;
+ val |= RG_SSUSB_PLL_IC_PE2H_VAL(0x1);
+ phy_write(mtk_phy, val, DA_SSUSB_PLL_IC);
+
+ val = phy_read(mtk_phy, DA_SSUSB_PLL_BP);
+ val &= ~RG_SSUSB_PLL_BP_PE2H;
+ val |= RG_SSUSB_PLL_BP_PE2H_VAL(0xa);
+ phy_write(mtk_phy, val, DA_SSUSB_PLL_BP);
+
+ /* Tx Detect Rx Timing: 10us -> 5us */
+ val = phy_read(mtk_phy, B2_PHYD_RXDET1);
+ val &= ~RG_SSUSB_RXDET_STB2;
+ val |= RG_SSUSB_RXDET_STB2_VAL(0x10);
+ phy_write(mtk_phy, val, B2_PHYD_RXDET1);
+
+ val = phy_read(mtk_phy, B2_PHYD_RXDET2);
+ val &= ~RG_SSUSB_RXDET_STB2_P3;
+ val |= RG_SSUSB_RXDET_STB2_P3_VAL(0x10);
+ phy_write(mtk_phy, val, B2_PHYD_RXDET2);
+
+ /* wait for PCIe subsys register to active */
+ usleep_range(2500, 3000);
+
+ return 0;
+}
+
+static int mtk_pcie_phy_power_off(struct phy *phy)
+{
+ struct mtk_pcie_phy *mtk_phy = phy_get_drvdata(phy);
+
+ clk_disable_unprepare(mtk_phy->phya_ref);
+
+ return 0;
+}
+
+static struct phy_ops mtk_pcie_phy_ops = {
+ .power_on = mtk_pcie_phy_power_on,
+ .power_off = mtk_pcie_phy_power_off,
+ .owner = THIS_MODULE,
+};
+
+static const struct of_device_id mtk_pcie_phy_of_match[];
+
+static int mtk_pcie_phy_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ const struct of_device_id *match;
+ struct phy_provider *phy_provider;
+ struct mtk_pcie_phy *mtk_phy;
+ struct resource *res;
+ struct phy *phy;
+
+ match = of_match_device(mtk_pcie_phy_of_match, &pdev->dev);
+ if (!match)
+ return -ENODEV;
+
+ mtk_phy = devm_kzalloc(&pdev->dev, sizeof(*mtk_phy), GFP_KERNEL);
+ if (!mtk_phy)
+ return -ENOMEM;
+
+ mtk_phy->dev = &pdev->dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ mtk_phy->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(mtk_phy->base)) {
+ dev_err(&pdev->dev, "failed to get phy base\n");
+ return PTR_ERR(mtk_phy->base);
+ }
+
+ mtk_phy->phya_ref = devm_clk_get(&pdev->dev, "pciephya_ref");
+ if (IS_ERR(mtk_phy->phya_ref)) {
+ dev_err(&pdev->dev, "error to get pciephya_ref\n");
+ return PTR_ERR(mtk_phy->phya_ref);
+ }
+
+ if (of_find_property(np, "mediatek,phy-switch", NULL)) {
+ mtk_phy->hif = syscon_regmap_lookup_by_phandle(
+ np, "mediatek,phy-switch");
+ if (IS_ERR(mtk_phy->hif)) {
+ dev_err(&pdev->dev, "missing \"mediatek,phy-switch\" phandle\n");
+ return PTR_ERR(mtk_phy->hif);
+ }
+ }
+
+ platform_set_drvdata(pdev, mtk_phy);
+ phy = devm_phy_create(&pdev->dev, NULL, &mtk_pcie_phy_ops);
+ if (IS_ERR(phy)) {
+ dev_err(&pdev->dev, "failed to create phy device\n");
+ return PTR_ERR(phy);
+ }
+
+ mtk_phy->phy = phy;
+ phy_set_drvdata(phy, mtk_phy);
+
+ phy_provider = devm_of_phy_provider_register(&pdev->dev,
+ of_phy_simple_xlate);
+ if (IS_ERR(phy_provider)) {
+ dev_err(&pdev->dev, "failed to register phy provider\n");
+ return PTR_ERR(phy_provider);
+ }
+
+ return 0;
+}
+
+static const struct of_device_id mtk_pcie_phy_of_match[] = {
+ { .compatible = "mediatek,mt7623-pcie-phy"},
+ { .compatible = "mediatek,mt2701-pcie-phy"},
+ {},
+};
+MODULE_DEVICE_TABLE(of, mtk_pcie_phy_of_match);
+
+static struct platform_driver mtk_pcie_phy_driver = {
+ .probe = mtk_pcie_phy_probe,
+ .driver = {
+ .name = "mtk-pcie-phy",
+ .of_match_table = mtk_pcie_phy_of_match,
+ }
+};
+module_platform_driver(mtk_pcie_phy_driver);
+
+MODULE_AUTHOR("Ryder Lee <ryder.lee@xxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Mediatek PCIe PHY driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1
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