[RFC/RFT v2 04/11] phy: rockchip: Support PCIe v3
Frank Wunderlich
linux at fw-web.de
Tue Apr 26 06:21:32 PDT 2022
From: Frank Wunderlich <frank-w at public-files.de>
RK3568 supports PCIe v3 using not Combphy like PCIe v2 on rk3566.
It use a dedicated PCIe-phy. Add support for this.
Signed-off-by: Frank Wunderlich <frank-w at public-files.de>
---
changes in v2:
- move dt-bindings header into separate patch
- use BIT-macro
- make constants better readable
- use dev_err instead of pr_*
- change dt-binding include due to renaming (phy-snps-pcie3.h => phy-rockchip-pcie3.h)
- use exclusive variant of devm_reset_control_get{,_exclusive}
- fix semicolon.cocci warnings reported by kernel test robot <lkp at intel.com>
---
driver was taken from linux 5.10 based on in
https://github.com/JeffyCN/mirrors
which now has disappeared
---
drivers/phy/rockchip/Kconfig | 9 +
drivers/phy/rockchip/Makefile | 1 +
.../phy/rockchip/phy-rockchip-snps-pcie3.c | 278 ++++++++++++++++++
include/linux/phy/pcie.h | 12 +
4 files changed, 300 insertions(+)
create mode 100644 drivers/phy/rockchip/phy-rockchip-snps-pcie3.c
create mode 100644 include/linux/phy/pcie.h
diff --git a/drivers/phy/rockchip/Kconfig b/drivers/phy/rockchip/Kconfig
index 9022e395c056..94360fc96a6f 100644
--- a/drivers/phy/rockchip/Kconfig
+++ b/drivers/phy/rockchip/Kconfig
@@ -83,6 +83,15 @@ config PHY_ROCKCHIP_PCIE
help
Enable this to support the Rockchip PCIe PHY.
+config PHY_ROCKCHIP_SNPS_PCIE3
+ tristate "Rockchip Snps PCIe3 PHY Driver"
+ depends on (ARCH_ROCKCHIP && OF) || COMPILE_TEST
+ depends on HAS_IOMEM
+ select GENERIC_PHY
+ select MFD_SYSCON
+ help
+ Enable this to support the Rockchip snps PCIe3 PHY.
+
config PHY_ROCKCHIP_TYPEC
tristate "Rockchip TYPEC PHY Driver"
depends on OF && (ARCH_ROCKCHIP || COMPILE_TEST)
diff --git a/drivers/phy/rockchip/Makefile b/drivers/phy/rockchip/Makefile
index a5041efb5b8f..7eab129230d1 100644
--- a/drivers/phy/rockchip/Makefile
+++ b/drivers/phy/rockchip/Makefile
@@ -8,5 +8,6 @@ obj-$(CONFIG_PHY_ROCKCHIP_INNO_HDMI) += phy-rockchip-inno-hdmi.o
obj-$(CONFIG_PHY_ROCKCHIP_INNO_USB2) += phy-rockchip-inno-usb2.o
obj-$(CONFIG_PHY_ROCKCHIP_NANENG_COMBO_PHY) += phy-rockchip-naneng-combphy.o
obj-$(CONFIG_PHY_ROCKCHIP_PCIE) += phy-rockchip-pcie.o
+obj-$(CONFIG_PHY_ROCKCHIP_SNPS_PCIE3) += phy-rockchip-snps-pcie3.o
obj-$(CONFIG_PHY_ROCKCHIP_TYPEC) += phy-rockchip-typec.o
obj-$(CONFIG_PHY_ROCKCHIP_USB) += phy-rockchip-usb.o
diff --git a/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c b/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c
new file mode 100644
index 000000000000..e228a0f2cb72
--- /dev/null
+++ b/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c
@@ -0,0 +1,278 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Rockchip PCIE3.0 phy driver
+ *
+ * Copyright (C) 2020 Rockchip Electronics Co., Ltd.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/phy/pcie.h>
+#include <linux/phy/phy.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <dt-bindings/phy/phy-rockchip-pcie3.h>
+
+/* Register for RK3568 */
+#define GRF_PCIE30PHY_CON1 0x4
+#define GRF_PCIE30PHY_CON6 0x18
+#define GRF_PCIE30PHY_CON9 0x24
+#define GRF_PCIE30PHY_STATUS0 0x80
+#define SRAM_INIT_DONE(reg) (reg & BIT(14))
+
+/* Register for RK3588 */
+#define PHP_GRF_PCIESEL_CON 0x100
+#define RK3588_PCIE3PHY_GRF_CMN_CON0 0x0
+#define RK3588_PCIE3PHY_GRF_PHY0_STATUS1 0x904
+#define RK3588_PCIE3PHY_GRF_PHY1_STATUS1 0xa04
+#define RK3588_SRAM_INIT_DONE(reg) (reg & BIT(0))
+
+struct rockchip_p3phy_ops;
+
+struct rockchip_p3phy_priv {
+ const struct rockchip_p3phy_ops *ops;
+ void __iomem *mmio;
+ /* mode: RC, EP */
+ int mode;
+ /* pcie30_phymode: Aggregation, Bifurcation */
+ int pcie30_phymode;
+ struct regmap *phy_grf;
+ struct regmap *pipe_grf;
+ struct reset_control *p30phy;
+ struct phy *phy;
+ struct clk_bulk_data *clks;
+ int num_clks;
+ bool is_bifurcation;
+};
+
+struct rockchip_p3phy_ops {
+ int (*phy_init)(struct rockchip_p3phy_priv *priv);
+};
+
+static int rockchip_p3phy_set_mode(struct phy *phy, enum phy_mode mode, int submode)
+{
+ struct rockchip_p3phy_priv *priv = phy_get_drvdata(phy);
+
+ /* Actually We don't care EP/RC mode, but just record it */
+ switch (submode) {
+ case PHY_MODE_PCIE_RC:
+ priv->mode = PHY_MODE_PCIE_RC;
+ break;
+ case PHY_MODE_PCIE_EP:
+ priv->mode = PHY_MODE_PCIE_EP;
+ break;
+ case PHY_MODE_PCIE_BIFURCATION:
+ priv->is_bifurcation = true;
+ break;
+ default:
+ dev_err(&phy->dev, "%s, invalid mode\n", __func__);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int rockchip_p3phy_rk3568_init(struct rockchip_p3phy_priv *priv)
+{
+ int ret;
+ u32 reg;
+
+ /* Deassert PCIe PMA output clamp mode */
+ regmap_write(priv->phy_grf, GRF_PCIE30PHY_CON9,
+ BIT(15) | BIT(31));
+ /* Set bifurcation if needed, and it doesn't care RC/EP */
+ if (priv->is_bifurcation) {
+ regmap_write(priv->phy_grf, GRF_PCIE30PHY_CON6,
+ 0x1 | (0xf << 16));
+ regmap_write(priv->phy_grf, GRF_PCIE30PHY_CON1,
+ BIT(15) | BIT(31));
+ }
+
+ reset_control_deassert(priv->p30phy);
+
+ ret = regmap_read_poll_timeout(priv->phy_grf,
+ GRF_PCIE30PHY_STATUS0,
+ reg, SRAM_INIT_DONE(reg),
+ 0, 500);
+ if (ret)
+ dev_err(&priv->phy->dev, "%s: lock failed 0x%x, check input refclk and power supply\n",
+ __func__, reg);
+ return ret;
+}
+
+static const struct rockchip_p3phy_ops rk3568_ops = {
+ .phy_init = rockchip_p3phy_rk3568_init,
+};
+
+static int rockchip_p3phy_rk3588_init(struct rockchip_p3phy_priv *priv)
+{
+ int ret;
+ u32 reg;
+
+ /* Deassert PCIe PMA output clamp mode */
+ regmap_write(priv->phy_grf, RK3588_PCIE3PHY_GRF_CMN_CON0,
+ BIT(8) | BIT(24));
+
+ reset_control_deassert(priv->p30phy);
+
+ ret = regmap_read_poll_timeout(priv->phy_grf,
+ RK3588_PCIE3PHY_GRF_PHY0_STATUS1,
+ reg, RK3588_SRAM_INIT_DONE(reg),
+ 0, 500);
+ ret |= regmap_read_poll_timeout(priv->phy_grf,
+ RK3588_PCIE3PHY_GRF_PHY1_STATUS1,
+ reg, RK3588_SRAM_INIT_DONE(reg),
+ 0, 500);
+ if (ret)
+ pr_err("%s: lock failed 0x%x, check input refclk and power supply\n",
+ __func__, reg);
+ return ret;
+}
+
+static const struct rockchip_p3phy_ops rk3588_ops = {
+ .phy_init = rockchip_p3phy_rk3588_init,
+};
+
+static int rochchip_p3phy_init(struct phy *phy)
+{
+ struct rockchip_p3phy_priv *priv = phy_get_drvdata(phy);
+ int ret;
+
+ ret = clk_bulk_prepare_enable(priv->num_clks, priv->clks);
+ if (ret) {
+ pr_err("failed to enable PCIe bulk clks %d\n", ret);
+ return ret;
+ }
+
+ reset_control_assert(priv->p30phy);
+ udelay(1);
+
+ if (priv->ops->phy_init) {
+ ret = priv->ops->phy_init(priv);
+ if (ret)
+ clk_bulk_disable_unprepare(priv->num_clks, priv->clks);
+ }
+
+ return ret;
+}
+
+static int rochchip_p3phy_exit(struct phy *phy)
+{
+ struct rockchip_p3phy_priv *priv = phy_get_drvdata(phy);
+
+ clk_bulk_disable_unprepare(priv->num_clks, priv->clks);
+ reset_control_assert(priv->p30phy);
+ return 0;
+}
+
+static const struct phy_ops rochchip_p3phy_ops = {
+ .init = rochchip_p3phy_init,
+ .exit = rochchip_p3phy_exit,
+ .set_mode = rockchip_p3phy_set_mode,
+ .owner = THIS_MODULE,
+};
+
+static int rockchip_p3phy_probe(struct platform_device *pdev)
+{
+ struct phy_provider *phy_provider;
+ struct device *dev = &pdev->dev;
+ struct rockchip_p3phy_priv *priv;
+ struct device_node *np = dev->of_node;
+ struct resource *res;
+ int ret;
+ u32 val, reg;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->mmio = devm_ioremap_resource(dev, res);
+ if (IS_ERR(priv->mmio)) {
+ ret = PTR_ERR(priv->mmio);
+ return ret;
+ }
+
+ priv->ops = of_device_get_match_data(&pdev->dev);
+ if (!priv->ops) {
+ dev_err(&pdev->dev, "no of match data provided\n");
+ return -EINVAL;
+ }
+
+ priv->phy_grf = syscon_regmap_lookup_by_phandle(np, "rockchip,phy-grf");
+ if (IS_ERR(priv->phy_grf)) {
+ dev_err(dev, "failed to find rockchip,phy_grf regmap\n");
+ return PTR_ERR(priv->phy_grf);
+ }
+
+ priv->pipe_grf = syscon_regmap_lookup_by_phandle(dev->of_node,
+ "rockchip,pipe-grf");
+ if (IS_ERR(priv->pipe_grf))
+ dev_info(dev, "failed to find rockchip,pipe_grf regmap\n");
+
+ ret = device_property_read_u32(dev, "rockchip,pcie30-phymode", &val);
+ if (!ret)
+ priv->pcie30_phymode = val;
+ else
+ priv->pcie30_phymode = PHY_MODE_PCIE_AGGREGATION;
+
+ /* Select correct pcie30_phymode */
+ if (priv->pcie30_phymode > 4)
+ priv->pcie30_phymode = PHY_MODE_PCIE_AGGREGATION;
+
+ regmap_write(priv->phy_grf, RK3588_PCIE3PHY_GRF_CMN_CON0,
+ (0x7<<16) | priv->pcie30_phymode);
+
+ /* Set pcie1ln_sel in PHP_GRF_PCIESEL_CON */
+ if (!IS_ERR(priv->pipe_grf)) {
+ reg = priv->pcie30_phymode & 3;
+ if (reg)
+ regmap_write(priv->pipe_grf, PHP_GRF_PCIESEL_CON,
+ (reg << 16) | reg);
+ }
+
+ priv->phy = devm_phy_create(dev, NULL, &rochchip_p3phy_ops);
+ if (IS_ERR(priv->phy)) {
+ dev_err(dev, "failed to create combphy\n");
+ return PTR_ERR(priv->phy);
+ }
+
+ priv->p30phy = devm_reset_control_get_exclusive(dev, "phy");
+ if (IS_ERR(priv->p30phy)) {
+ dev_warn(dev, "no phy reset control specified\n");
+ priv->p30phy = NULL;
+ }
+
+ priv->num_clks = devm_clk_bulk_get_all(dev, &priv->clks);
+ if (priv->num_clks < 1)
+ return -ENODEV;
+
+ dev_set_drvdata(dev, priv);
+ phy_set_drvdata(priv->phy, priv);
+ 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 rockchip_p3phy_of_match[] = {
+ { .compatible = "rockchip,rk3568-pcie3-phy", .data = &rk3568_ops },
+ { .compatible = "rockchip,rk3588-pcie3-phy", .data = &rk3588_ops },
+ { },
+};
+MODULE_DEVICE_TABLE(of, rockchip_p3phy_of_match);
+
+static struct platform_driver rockchip_p3phy_driver = {
+ .probe = rockchip_p3phy_probe,
+ .driver = {
+ .name = "rockchip-snps-pcie3-phy",
+ .of_match_table = rockchip_p3phy_of_match,
+ },
+};
+module_platform_driver(rockchip_p3phy_driver);
+MODULE_DESCRIPTION("Rockchip Synopsys PCIe 3.0 PHY driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/phy/pcie.h b/include/linux/phy/pcie.h
new file mode 100644
index 000000000000..93c997f520fe
--- /dev/null
+++ b/include/linux/phy/pcie.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2021 Rockchip Electronics Co., Ltd.
+ */
+#ifndef __PHY_PCIE_H
+#define __PHY_PCIE_H
+
+#define PHY_MODE_PCIE_RC 20
+#define PHY_MODE_PCIE_EP 21
+#define PHY_MODE_PCIE_BIFURCATION 22
+
+#endif
--
2.25.1
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