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Message-Id: <5501f28372f1f3ce1f86288c3de056d2799370a7.1626126198.git.mchehab+huawei@kernel.org>
Date: Mon, 12 Jul 2021 23:46:43 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: linuxarm@...wei.com, mauro.chehab@...wei.com,
Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
"Manivannan Sadhasivam" <mani@...nel.org>,
"Rob Herring" <robh@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Kishon Vijay Abraham I <kishon@...com>,
Vinod Koul <vkoul@...nel.org>, linux-kernel@...r.kernel.org,
linux-phy@...ts.infradead.org
Subject: [PATCH v4 5/8] phy: HiSilicon: Add driver for Kirin 960 PCIe PHY
The pcie-kirin PCIe driver contains internally a PHY interface for
a Kirin 960. As we'll be adding support also for Kirin 970 PHY, we
need to first split the PHY into a separate driver.
So, add a new driver with just the PHY part of
drivers/pci/controller/dwc/pcie-kirin.c.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
drivers/phy/hisilicon/Kconfig | 10 +
drivers/phy/hisilicon/Makefile | 1 +
drivers/phy/hisilicon/phy-hi3660-pcie.c | 325 ++++++++++++++++++++++++
3 files changed, 336 insertions(+)
create mode 100644 drivers/phy/hisilicon/phy-hi3660-pcie.c
diff --git a/drivers/phy/hisilicon/Kconfig b/drivers/phy/hisilicon/Kconfig
index 4d008cfc279c..30b7f1187965 100644
--- a/drivers/phy/hisilicon/Kconfig
+++ b/drivers/phy/hisilicon/Kconfig
@@ -23,6 +23,16 @@ config PHY_HI3660_USB
To compile this driver as a module, choose M here.
+config PHY_HI3660_PCIE
+ tristate "hi3660 PCIe PHY support"
+ depends on (ARCH_HISI && ARM64) || COMPILE_TEST
+ select GENERIC_PHY
+ select MFD_SYSCON
+ help
+ Enable this to support the HiSilicon hi3660 PCIe PHY.
+
+ To compile this driver as a module, choose M here.
+
config PHY_HI3670_USB
tristate "hi3670 USB PHY support"
depends on (ARCH_HISI && ARM64) || COMPILE_TEST
diff --git a/drivers/phy/hisilicon/Makefile b/drivers/phy/hisilicon/Makefile
index 51729868145b..3c3d70dd7469 100644
--- a/drivers/phy/hisilicon/Makefile
+++ b/drivers/phy/hisilicon/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_PHY_HI6220_USB) += phy-hi6220-usb.o
obj-$(CONFIG_PHY_HI3660_USB) += phy-hi3660-usb3.o
+obj-$(CONFIG_PHY_HI3660_PCIE) += phy-hi3660-pcie.o
obj-$(CONFIG_PHY_HI3670_USB) += phy-hi3670-usb3.o
obj-$(CONFIG_PHY_HISTB_COMBPHY) += phy-histb-combphy.o
obj-$(CONFIG_PHY_HISI_INNO_USB2) += phy-hisi-inno-usb2.o
diff --git a/drivers/phy/hisilicon/phy-hi3660-pcie.c b/drivers/phy/hisilicon/phy-hi3660-pcie.c
new file mode 100644
index 000000000000..130314b0e8cb
--- /dev/null
+++ b/drivers/phy/hisilicon/phy-hi3660-pcie.c
@@ -0,0 +1,325 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe phy driver for Kirin 960
+ *
+ * Copyright (C) 2017 HiSilicon Electronics Co., Ltd.
+ * https://www.huawei.com
+ *
+ * Copyright (C) 2021 Huawei Electronics Co., Ltd.
+ * https://www.huawei.com
+ *
+ * Author:
+ * Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
+ */
+
+#include <linux/clk.h>
+#include <linux/gpio.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define REF_CLK_FREQ 100000000
+
+/* info located in APB PHY */
+#define PCIE_APB_PHY_CTRL0 0x0
+#define PCIE_APB_PHY_CTRL1 0x4
+#define PCIE_APB_PHY_STATUS0 0x400
+#define PIPE_CLK_STABLE BIT(19)
+#define PHY_REF_PAD_BIT BIT(8)
+#define PHY_PWR_DOWN_BIT BIT(22)
+#define PHY_RST_ACK_BIT BIT(16)
+
+/* info located in sysctrl */
+#define SCTRL_PCIE_CMOS_OFFSET 0x60
+#define SCTRL_PCIE_CMOS_BIT 0x10
+#define SCTRL_PCIE_ISO_OFFSET 0x44
+#define SCTRL_PCIE_ISO_BIT 0x30
+#define SCTRL_PCIE_HPCLK_OFFSET 0x190
+#define SCTRL_PCIE_HPCLK_BIT 0x184000
+#define SCTRL_PCIE_OE_OFFSET 0x14a
+#define PCIE_DEBOUNCE_PARAM 0xF0F400
+#define PCIE_OE_BYPASS (0x3 << 28)
+
+/* peri_crg ctrl */
+#define CRGCTRL_PCIE_ASSERT_OFFSET 0x88
+#define CRGCTRL_PCIE_ASSERT_BIT 0x8c000000
+
+/* Time for delay */
+#define REF_2_PERST_MIN 20000
+#define REF_2_PERST_MAX 25000
+#define PERST_2_ACCESS_MIN 10000
+#define PERST_2_ACCESS_MAX 12000
+#define PIPE_CLK_WAIT_MIN 550
+#define PIPE_CLK_WAIT_MAX 600
+#define TIME_CMOS_MIN 100
+#define TIME_CMOS_MAX 105
+#define TIME_PHY_PD_MIN 10
+#define TIME_PHY_PD_MAX 11
+
+struct hi3660_pcie_phy {
+ struct device *dev;
+ void __iomem *base;
+ struct regmap *crgctrl;
+ struct regmap *sysctrl;
+ struct clk *apb_sys_clk;
+ struct clk *apb_phy_clk;
+ struct clk *phy_ref_clk;
+ struct clk *pcie_aclk;
+ struct clk *pcie_aux_clk;
+ int gpio_id_reset;
+};
+
+/* Registers in PCIePHY */
+static inline void kirin_apb_phy_writel(struct hi3660_pcie_phy *hi3660_pcie_phy,
+ u32 val, u32 reg)
+{
+ writel(val, hi3660_pcie_phy->base + reg);
+}
+
+static inline u32 kirin_apb_phy_readl(struct hi3660_pcie_phy *hi3660_pcie_phy,
+ u32 reg)
+{
+ return readl(hi3660_pcie_phy->base + reg);
+}
+
+static void hi3660_pcie_phy_oe_enable(struct hi3660_pcie_phy *phy)
+{
+ u32 val;
+
+ regmap_read(phy->sysctrl, SCTRL_PCIE_OE_OFFSET, &val);
+ val |= PCIE_DEBOUNCE_PARAM;
+ val &= ~PCIE_OE_BYPASS;
+ regmap_write(phy->sysctrl, SCTRL_PCIE_OE_OFFSET, val);
+}
+
+
+static int kirin_pcie_clk_ctrl(struct hi3660_pcie_phy *phy, bool enable)
+{
+ int ret = 0;
+
+ if (!enable)
+ goto close_clk;
+
+ ret = clk_set_rate(phy->phy_ref_clk, REF_CLK_FREQ);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(phy->phy_ref_clk);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(phy->apb_sys_clk);
+ if (ret)
+ goto apb_sys_fail;
+
+ ret = clk_prepare_enable(phy->apb_phy_clk);
+ if (ret)
+ goto apb_phy_fail;
+
+ ret = clk_prepare_enable(phy->pcie_aclk);
+ if (ret)
+ goto aclk_fail;
+
+ ret = clk_prepare_enable(phy->pcie_aux_clk);
+ if (ret)
+ goto aux_clk_fail;
+
+ return 0;
+
+close_clk:
+ clk_disable_unprepare(phy->pcie_aux_clk);
+aux_clk_fail:
+ clk_disable_unprepare(phy->pcie_aclk);
+aclk_fail:
+ clk_disable_unprepare(phy->apb_phy_clk);
+apb_phy_fail:
+ clk_disable_unprepare(phy->apb_sys_clk);
+apb_sys_fail:
+ clk_disable_unprepare(phy->phy_ref_clk);
+
+ return ret;
+}
+
+static int hi3660_pcie_phy_power_on(struct phy *generic_phy)
+{
+ struct hi3660_pcie_phy *phy = phy_get_drvdata(generic_phy);
+ struct device *dev = phy->dev;
+ u32 reg_val;
+ int ret;
+
+ /* Power supply for Host */
+ regmap_write(phy->sysctrl,
+ SCTRL_PCIE_CMOS_OFFSET, SCTRL_PCIE_CMOS_BIT);
+ usleep_range(TIME_CMOS_MIN, TIME_CMOS_MAX);
+
+ hi3660_pcie_phy_oe_enable(phy);
+
+ ret = kirin_pcie_clk_ctrl(phy, true);
+ if (ret)
+ return ret;
+
+ /* ISO disable, PCIeCtrl, PHY assert and clk gate clear */
+ regmap_write(phy->sysctrl,
+ SCTRL_PCIE_ISO_OFFSET, SCTRL_PCIE_ISO_BIT);
+ regmap_write(phy->crgctrl,
+ CRGCTRL_PCIE_ASSERT_OFFSET, CRGCTRL_PCIE_ASSERT_BIT);
+ regmap_write(phy->sysctrl,
+ SCTRL_PCIE_HPCLK_OFFSET, SCTRL_PCIE_HPCLK_BIT);
+
+ reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_CTRL1);
+ reg_val &= ~PHY_REF_PAD_BIT;
+ kirin_apb_phy_writel(phy, reg_val, PCIE_APB_PHY_CTRL1);
+
+ reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_CTRL0);
+ reg_val &= ~PHY_PWR_DOWN_BIT;
+ kirin_apb_phy_writel(phy, reg_val, PCIE_APB_PHY_CTRL0);
+ usleep_range(TIME_PHY_PD_MIN, TIME_PHY_PD_MAX);
+
+ reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_CTRL1);
+ reg_val &= ~PHY_RST_ACK_BIT;
+ kirin_apb_phy_writel(phy, reg_val, PCIE_APB_PHY_CTRL1);
+
+ usleep_range(PIPE_CLK_WAIT_MIN, PIPE_CLK_WAIT_MAX);
+ reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_STATUS0);
+ if (reg_val & PIPE_CLK_STABLE) {
+ dev_err(dev, "PIPE clk is not stable\n");
+ ret = -EINVAL;
+ goto disable_clks;
+ }
+
+ /* perst assert Endpoint */
+ if (!gpio_request(phy->gpio_id_reset, "pcie_perst")) {
+ usleep_range(REF_2_PERST_MIN, REF_2_PERST_MAX);
+ ret = gpio_direction_output(phy->gpio_id_reset, 1);
+ if (ret)
+ goto disable_clks;
+ usleep_range(PERST_2_ACCESS_MIN, PERST_2_ACCESS_MAX);
+ return 0;
+ }
+
+disable_clks:
+ kirin_pcie_clk_ctrl(phy, false);
+ return ret;
+}
+
+static int hi3660_pcie_phy_power_off(struct phy *generic_phy)
+{
+ struct hi3660_pcie_phy *phy = phy_get_drvdata(generic_phy);
+
+ /* Drop power supply for Host */
+ regmap_write(phy->sysctrl, SCTRL_PCIE_CMOS_OFFSET, 0x00);
+
+ kirin_pcie_clk_ctrl(phy, false);
+
+ return 0;
+}
+
+static const struct phy_ops hi3660_phy_ops = {
+ .power_on = hi3660_pcie_phy_power_on,
+ .power_off = hi3660_pcie_phy_power_off,
+ .owner = THIS_MODULE,
+};
+
+static int kirin_pcie_get_resources(struct hi3660_pcie_phy *phy,
+ struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+
+ /* syscon */
+ phy->crgctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3660-crgctrl");
+ if (IS_ERR(phy->crgctrl))
+ return PTR_ERR(phy->crgctrl);
+
+ phy->sysctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3660-sctrl");
+ if (IS_ERR(phy->sysctrl))
+ return PTR_ERR(phy->sysctrl);
+
+ /* clocks */
+ phy->phy_ref_clk = devm_clk_get(dev, "pcie_phy_ref");
+ if (IS_ERR(phy->phy_ref_clk))
+ return PTR_ERR(phy->phy_ref_clk);
+
+ phy->pcie_aux_clk = devm_clk_get(dev, "pcie_aux");
+ if (IS_ERR(phy->pcie_aux_clk))
+ return PTR_ERR(phy->pcie_aux_clk);
+
+ phy->apb_phy_clk = devm_clk_get(dev, "pcie_apb_phy");
+ if (IS_ERR(phy->apb_phy_clk))
+ return PTR_ERR(phy->apb_phy_clk);
+
+ phy->apb_sys_clk = devm_clk_get(dev, "pcie_apb_sys");
+ if (IS_ERR(phy->apb_sys_clk))
+ return PTR_ERR(phy->apb_sys_clk);
+
+ phy->pcie_aclk = devm_clk_get(dev, "pcie_aclk");
+ if (IS_ERR(phy->pcie_aclk))
+ return PTR_ERR(phy->pcie_aclk);
+
+ /* registers */
+ phy->base = devm_platform_ioremap_resource_byname(pdev, "phy");
+ if (IS_ERR(phy->base))
+ return PTR_ERR(phy->base);
+
+ /* gpios */
+ phy->gpio_id_reset = of_get_named_gpio(dev->of_node,
+ "reset-gpios", 0);
+ if (phy->gpio_id_reset == -EPROBE_DEFER) {
+ return -EPROBE_DEFER;
+ } else if (!gpio_is_valid(phy->gpio_id_reset)) {
+ dev_err(dev, "unable to get a valid gpio pin\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int hi3660_pcie_phy_probe(struct platform_device *pdev)
+{
+ struct phy_provider *phy_provider;
+ struct device *dev = &pdev->dev;
+ struct hi3660_pcie_phy *phy;
+ struct phy *generic_phy;
+ int ret;
+
+ phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
+ if (!phy)
+ return -ENOMEM;
+
+ phy->dev = dev;
+
+ ret = kirin_pcie_get_resources(phy, pdev);
+ if (ret)
+ return ret;
+
+ generic_phy = devm_phy_create(dev, dev->of_node, &hi3660_phy_ops);
+ if (IS_ERR(generic_phy)) {
+ dev_err(dev, "failed to create PHY\n");
+ return PTR_ERR(generic_phy);
+ }
+
+ phy_set_drvdata(generic_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 hi3660_pcie_phy_match[] = {
+ {
+ .compatible = "hisilicon,hi960-pcie-phy",
+ },
+ {},
+};
+
+static struct platform_driver hi3660_pcie_phy_driver = {
+ .probe = hi3660_pcie_phy_probe,
+ .driver = {
+ .of_match_table = hi3660_pcie_phy_match,
+ .name = "hi3660_pcie_phy",
+ .suppress_bind_attrs = true,
+ }
+};
+builtin_platform_driver(hi3660_pcie_phy_driver);
--
2.31.1
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