Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 453 insertions, 0 deletions

diff --git a/drivers/pci/controller/dwc/pcie-uniphier-ep.c b/drivers/pci/controller/dwc/pcie-uniphier-ep.c
new file mode 100644
index 0000000000..cba3c88fcf
--- /dev/null
+++ b/drivers/pci/controller/dwc/pcie-uniphier-ep.c
@@ -0,0 +1,453 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe endpoint controller driver for UniPhier SoCs
+ * Copyright 2018 Socionext Inc.
+ * Author: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/iopoll.h>
+#include <linux/of.h>
+#include <linux/pci.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#include "pcie-designware.h"
+
+/* Link Glue registers */
+#define PCL_RSTCTRL0			0x0010
+#define PCL_RSTCTRL_AXI_REG		BIT(3)
+#define PCL_RSTCTRL_AXI_SLAVE		BIT(2)
+#define PCL_RSTCTRL_AXI_MASTER		BIT(1)
+#define PCL_RSTCTRL_PIPE3		BIT(0)
+
+#define PCL_RSTCTRL1			0x0020
+#define PCL_RSTCTRL_PERST		BIT(0)
+
+#define PCL_RSTCTRL2			0x0024
+#define PCL_RSTCTRL_PHY_RESET		BIT(0)
+
+#define PCL_PINCTRL0			0x002c
+#define PCL_PERST_PLDN_REGEN		BIT(12)
+#define PCL_PERST_NOE_REGEN		BIT(11)
+#define PCL_PERST_OUT_REGEN		BIT(8)
+#define PCL_PERST_PLDN_REGVAL		BIT(4)
+#define PCL_PERST_NOE_REGVAL		BIT(3)
+#define PCL_PERST_OUT_REGVAL		BIT(0)
+
+#define PCL_PIPEMON			0x0044
+#define PCL_PCLK_ALIVE			BIT(15)
+
+#define PCL_MODE			0x8000
+#define PCL_MODE_REGEN			BIT(8)
+#define PCL_MODE_REGVAL			BIT(0)
+
+#define PCL_APP_CLK_CTRL		0x8004
+#define PCL_APP_CLK_REQ			BIT(0)
+
+#define PCL_APP_READY_CTRL		0x8008
+#define PCL_APP_LTSSM_ENABLE		BIT(0)
+
+#define PCL_APP_MSI0			0x8040
+#define PCL_APP_VEN_MSI_TC_MASK		GENMASK(10, 8)
+#define PCL_APP_VEN_MSI_VECTOR_MASK	GENMASK(4, 0)
+
+#define PCL_APP_MSI1			0x8044
+#define PCL_APP_MSI_REQ			BIT(0)
+
+#define PCL_APP_INTX			0x8074
+#define PCL_APP_INTX_SYS_INT		BIT(0)
+
+#define PCL_APP_PM0			0x8078
+#define PCL_SYS_AUX_PWR_DET		BIT(8)
+
+/* assertion time of INTx in usec */
+#define PCL_INTX_WIDTH_USEC		30
+
+struct uniphier_pcie_ep_priv {
+	void __iomem *base;
+	struct dw_pcie pci;
+	struct clk *clk, *clk_gio;
+	struct reset_control *rst, *rst_gio;
+	struct phy *phy;
+	const struct uniphier_pcie_ep_soc_data *data;
+};
+
+struct uniphier_pcie_ep_soc_data {
+	bool has_gio;
+	void (*init)(struct uniphier_pcie_ep_priv *priv);
+	int (*wait)(struct uniphier_pcie_ep_priv *priv);
+	const struct pci_epc_features features;
+};
+
+#define to_uniphier_pcie(x)	dev_get_drvdata((x)->dev)
+
+static void uniphier_pcie_ltssm_enable(struct uniphier_pcie_ep_priv *priv,
+				       bool enable)
+{
+	u32 val;
+
+	val = readl(priv->base + PCL_APP_READY_CTRL);
+	if (enable)
+		val |= PCL_APP_LTSSM_ENABLE;
+	else
+		val &= ~PCL_APP_LTSSM_ENABLE;
+	writel(val, priv->base + PCL_APP_READY_CTRL);
+}
+
+static void uniphier_pcie_phy_reset(struct uniphier_pcie_ep_priv *priv,
+				    bool assert)
+{
+	u32 val;
+
+	val = readl(priv->base + PCL_RSTCTRL2);
+	if (assert)
+		val |= PCL_RSTCTRL_PHY_RESET;
+	else
+		val &= ~PCL_RSTCTRL_PHY_RESET;
+	writel(val, priv->base + PCL_RSTCTRL2);
+}
+
+static void uniphier_pcie_pro5_init_ep(struct uniphier_pcie_ep_priv *priv)
+{
+	u32 val;
+
+	/* set EP mode */
+	val = readl(priv->base + PCL_MODE);
+	val |= PCL_MODE_REGEN | PCL_MODE_REGVAL;
+	writel(val, priv->base + PCL_MODE);
+
+	/* clock request */
+	val = readl(priv->base + PCL_APP_CLK_CTRL);
+	val &= ~PCL_APP_CLK_REQ;
+	writel(val, priv->base + PCL_APP_CLK_CTRL);
+
+	/* deassert PIPE3 and AXI reset */
+	val = readl(priv->base + PCL_RSTCTRL0);
+	val |= PCL_RSTCTRL_AXI_REG | PCL_RSTCTRL_AXI_SLAVE
+		| PCL_RSTCTRL_AXI_MASTER | PCL_RSTCTRL_PIPE3;
+	writel(val, priv->base + PCL_RSTCTRL0);
+
+	uniphier_pcie_ltssm_enable(priv, false);
+
+	msleep(100);
+}
+
+static void uniphier_pcie_nx1_init_ep(struct uniphier_pcie_ep_priv *priv)
+{
+	u32 val;
+
+	/* set EP mode */
+	val = readl(priv->base + PCL_MODE);
+	val |= PCL_MODE_REGEN | PCL_MODE_REGVAL;
+	writel(val, priv->base + PCL_MODE);
+
+	/* use auxiliary power detection */
+	val = readl(priv->base + PCL_APP_PM0);
+	val |= PCL_SYS_AUX_PWR_DET;
+	writel(val, priv->base + PCL_APP_PM0);
+
+	/* assert PERST# */
+	val = readl(priv->base + PCL_PINCTRL0);
+	val &= ~(PCL_PERST_NOE_REGVAL | PCL_PERST_OUT_REGVAL
+		 | PCL_PERST_PLDN_REGVAL);
+	val |= PCL_PERST_NOE_REGEN | PCL_PERST_OUT_REGEN
+		| PCL_PERST_PLDN_REGEN;
+	writel(val, priv->base + PCL_PINCTRL0);
+
+	uniphier_pcie_ltssm_enable(priv, false);
+
+	usleep_range(100000, 200000);
+
+	/* deassert PERST# */
+	val = readl(priv->base + PCL_PINCTRL0);
+	val |= PCL_PERST_OUT_REGVAL | PCL_PERST_OUT_REGEN;
+	writel(val, priv->base + PCL_PINCTRL0);
+}
+
+static int uniphier_pcie_nx1_wait_ep(struct uniphier_pcie_ep_priv *priv)
+{
+	u32 status;
+	int ret;
+
+	/* wait PIPE clock */
+	ret = readl_poll_timeout(priv->base + PCL_PIPEMON, status,
+				 status & PCL_PCLK_ALIVE, 100000, 1000000);
+	if (ret) {
+		dev_err(priv->pci.dev,
+			"Failed to initialize controller in EP mode\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int uniphier_pcie_start_link(struct dw_pcie *pci)
+{
+	struct uniphier_pcie_ep_priv *priv = to_uniphier_pcie(pci);
+
+	uniphier_pcie_ltssm_enable(priv, true);
+
+	return 0;
+}
+
+static void uniphier_pcie_stop_link(struct dw_pcie *pci)
+{
+	struct uniphier_pcie_ep_priv *priv = to_uniphier_pcie(pci);
+
+	uniphier_pcie_ltssm_enable(priv, false);
+}
+
+static void uniphier_pcie_ep_init(struct dw_pcie_ep *ep)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	enum pci_barno bar;
+
+	for (bar = BAR_0; bar <= BAR_5; bar++)
+		dw_pcie_ep_reset_bar(pci, bar);
+}
+
+static int uniphier_pcie_ep_raise_legacy_irq(struct dw_pcie_ep *ep)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	struct uniphier_pcie_ep_priv *priv = to_uniphier_pcie(pci);
+	u32 val;
+
+	/*
+	 * This makes pulse signal to send INTx to the RC, so this should
+	 * be cleared as soon as possible. This sequence is covered with
+	 * mutex in pci_epc_raise_irq().
+	 */
+	/* assert INTx */
+	val = readl(priv->base + PCL_APP_INTX);
+	val |= PCL_APP_INTX_SYS_INT;
+	writel(val, priv->base + PCL_APP_INTX);
+
+	udelay(PCL_INTX_WIDTH_USEC);
+
+	/* deassert INTx */
+	val &= ~PCL_APP_INTX_SYS_INT;
+	writel(val, priv->base + PCL_APP_INTX);
+
+	return 0;
+}
+
+static int uniphier_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep,
+					  u8 func_no, u16 interrupt_num)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	struct uniphier_pcie_ep_priv *priv = to_uniphier_pcie(pci);
+	u32 val;
+
+	val = FIELD_PREP(PCL_APP_VEN_MSI_TC_MASK, func_no)
+		| FIELD_PREP(PCL_APP_VEN_MSI_VECTOR_MASK, interrupt_num - 1);
+	writel(val, priv->base + PCL_APP_MSI0);
+
+	val = readl(priv->base + PCL_APP_MSI1);
+	val |= PCL_APP_MSI_REQ;
+	writel(val, priv->base + PCL_APP_MSI1);
+
+	return 0;
+}
+
+static int uniphier_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
+				      enum pci_epc_irq_type type,
+				      u16 interrupt_num)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+
+	switch (type) {
+	case PCI_EPC_IRQ_LEGACY:
+		return uniphier_pcie_ep_raise_legacy_irq(ep);
+	case PCI_EPC_IRQ_MSI:
+		return uniphier_pcie_ep_raise_msi_irq(ep, func_no,
+						      interrupt_num);
+	default:
+		dev_err(pci->dev, "UNKNOWN IRQ type (%d)\n", type);
+	}
+
+	return 0;
+}
+
+static const struct pci_epc_features*
+uniphier_pcie_get_features(struct dw_pcie_ep *ep)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	struct uniphier_pcie_ep_priv *priv = to_uniphier_pcie(pci);
+
+	return &priv->data->features;
+}
+
+static const struct dw_pcie_ep_ops uniphier_pcie_ep_ops = {
+	.ep_init = uniphier_pcie_ep_init,
+	.raise_irq = uniphier_pcie_ep_raise_irq,
+	.get_features = uniphier_pcie_get_features,
+};
+
+static int uniphier_pcie_ep_enable(struct uniphier_pcie_ep_priv *priv)
+{
+	int ret;
+
+	ret = clk_prepare_enable(priv->clk);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(priv->clk_gio);
+	if (ret)
+		goto out_clk_disable;
+
+	ret = reset_control_deassert(priv->rst);
+	if (ret)
+		goto out_clk_gio_disable;
+
+	ret = reset_control_deassert(priv->rst_gio);
+	if (ret)
+		goto out_rst_assert;
+
+	if (priv->data->init)
+		priv->data->init(priv);
+
+	uniphier_pcie_phy_reset(priv, true);
+
+	ret = phy_init(priv->phy);
+	if (ret)
+		goto out_rst_gio_assert;
+
+	uniphier_pcie_phy_reset(priv, false);
+
+	if (priv->data->wait) {
+		ret = priv->data->wait(priv);
+		if (ret)
+			goto out_phy_exit;
+	}
+
+	return 0;
+
+out_phy_exit:
+	phy_exit(priv->phy);
+out_rst_gio_assert:
+	reset_control_assert(priv->rst_gio);
+out_rst_assert:
+	reset_control_assert(priv->rst);
+out_clk_gio_disable:
+	clk_disable_unprepare(priv->clk_gio);
+out_clk_disable:
+	clk_disable_unprepare(priv->clk);
+
+	return ret;
+}
+
+static const struct dw_pcie_ops dw_pcie_ops = {
+	.start_link = uniphier_pcie_start_link,
+	.stop_link = uniphier_pcie_stop_link,
+};
+
+static int uniphier_pcie_ep_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct uniphier_pcie_ep_priv *priv;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->data = of_device_get_match_data(dev);
+	if (WARN_ON(!priv->data))
+		return -EINVAL;
+
+	priv->pci.dev = dev;
+	priv->pci.ops = &dw_pcie_ops;
+
+	priv->base = devm_platform_ioremap_resource_byname(pdev, "link");
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	if (priv->data->has_gio) {
+		priv->clk_gio = devm_clk_get(dev, "gio");
+		if (IS_ERR(priv->clk_gio))
+			return PTR_ERR(priv->clk_gio);
+
+		priv->rst_gio = devm_reset_control_get_shared(dev, "gio");
+		if (IS_ERR(priv->rst_gio))
+			return PTR_ERR(priv->rst_gio);
+	}
+
+	priv->clk = devm_clk_get(dev, "link");
+	if (IS_ERR(priv->clk))
+		return PTR_ERR(priv->clk);
+
+	priv->rst = devm_reset_control_get_shared(dev, "link");
+	if (IS_ERR(priv->rst))
+		return PTR_ERR(priv->rst);
+
+	priv->phy = devm_phy_optional_get(dev, "pcie-phy");
+	if (IS_ERR(priv->phy)) {
+		ret = PTR_ERR(priv->phy);
+		dev_err(dev, "Failed to get phy (%d)\n", ret);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	ret = uniphier_pcie_ep_enable(priv);
+	if (ret)
+		return ret;
+
+	priv->pci.ep.ops = &uniphier_pcie_ep_ops;
+	return dw_pcie_ep_init(&priv->pci.ep);
+}
+
+static const struct uniphier_pcie_ep_soc_data uniphier_pro5_data = {
+	.has_gio = true,
+	.init = uniphier_pcie_pro5_init_ep,
+	.wait = NULL,
+	.features = {
+		.linkup_notifier = false,
+		.msi_capable = true,
+		.msix_capable = false,
+		.align = 1 << 16,
+		.bar_fixed_64bit = BIT(BAR_0) | BIT(BAR_2) | BIT(BAR_4),
+		.reserved_bar =  BIT(BAR_4),
+	},
+};
+
+static const struct uniphier_pcie_ep_soc_data uniphier_nx1_data = {
+	.has_gio = false,
+	.init = uniphier_pcie_nx1_init_ep,
+	.wait = uniphier_pcie_nx1_wait_ep,
+	.features = {
+		.linkup_notifier = false,
+		.msi_capable = true,
+		.msix_capable = false,
+		.align = 1 << 12,
+		.bar_fixed_64bit = BIT(BAR_0) | BIT(BAR_2) | BIT(BAR_4),
+	},
+};
+
+static const struct of_device_id uniphier_pcie_ep_match[] = {
+	{
+		.compatible = "socionext,uniphier-pro5-pcie-ep",
+		.data = &uniphier_pro5_data,
+	},
+	{
+		.compatible = "socionext,uniphier-nx1-pcie-ep",
+		.data = &uniphier_nx1_data,
+	},
+	{ /* sentinel */ },
+};
+
+static struct platform_driver uniphier_pcie_ep_driver = {
+	.probe  = uniphier_pcie_ep_probe,
+	.driver = {
+		.name = "uniphier-pcie-ep",
+		.of_match_table = uniphier_pcie_ep_match,
+		.suppress_bind_attrs = true,
+	},
+};
+builtin_platform_driver(uniphier_pcie_ep_driver);