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path: root/drivers/pci/controller/dwc/pcie-uniphier-ep.c
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Diffstat (limited to 'drivers/pci/controller/dwc/pcie-uniphier-ep.c')
-rw-r--r--drivers/pci/controller/dwc/pcie-uniphier-ep.c453
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 000000000..4d0a587c0
--- /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_device.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);