[02/16] PCI: exynos: Rename Exynos PCIe driver to Samsung PCIe

diff --git a/MAINTAINERS b/MAINTAINERS
index a9d38274bd4d..e61374adf193 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -16084,13 +16084,13 @@  S:	Maintained
 F:	Documentation/devicetree/bindings/pci/*rcar*
 F:	drivers/pci/controller/*rcar*
 
-PCI DRIVER FOR SAMSUNG EXYNOS
+PCI DRIVER FOR SAMSUNG
 M:	Jingoo Han <jingoohan1@gmail.com>
 L:	linux-pci@vger.kernel.org
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 L:	linux-samsung-soc@vger.kernel.org
 S:	Maintained
-F:	drivers/pci/controller/dwc/pci-exynos.c
+F:	drivers/pci/controller/dwc/pci-samsung.c
 
 PCI DRIVER FOR SYNOPSYS DESIGNWARE
 M:	Jingoo Han <jingoohan1@gmail.com>
diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
index 434f6a4f4041..837c7693ac6e 100644
--- a/drivers/pci/controller/dwc/Kconfig
+++ b/drivers/pci/controller/dwc/Kconfig
@@ -80,13 +80,13 @@  config PCIE_DW_PLAT_EP
 	  order to enable device-specific features PCI_DW_PLAT_EP must be
 	  selected.
 
-config PCI_EXYNOS
-	tristate "Samsung Exynos PCIe controller"
+config PCI_SAMSUNG
+	tristate "Samsung PCIe controller"
 	depends on ARCH_EXYNOS || COMPILE_TEST
 	depends on PCI_MSI
 	select PCIE_DW_HOST
 	help
-	  Enables support for the PCIe controller in the Samsung Exynos SoCs
+	  Enables support for the PCIe controller in the Samsung SoCs
 	  to work in host mode. The PCI controller is based on the DesignWare
 	  hardware and therefore the driver re-uses the DesignWare core
 	  functions to implement the driver.
diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile
index bf5c311875a1..9daf9643342d 100644
--- a/drivers/pci/controller/dwc/Makefile
+++ b/drivers/pci/controller/dwc/Makefile
@@ -5,7 +5,7 @@  obj-$(CONFIG_PCIE_DW_EP) += pcie-designware-ep.o
 obj-$(CONFIG_PCIE_DW_PLAT) += pcie-designware-plat.o
 obj-$(CONFIG_PCIE_BT1) += pcie-bt1.o
 obj-$(CONFIG_PCI_DRA7XX) += pci-dra7xx.o
-obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o
+obj-$(CONFIG_PCI_SAMSUNG) += pci-samsung.o
 obj-$(CONFIG_PCIE_FU740) += pcie-fu740.o
 obj-$(CONFIG_PCI_IMX6) += pci-imx6.o
 obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o
diff --git a/drivers/pci/controller/dwc/pci-samsung.c b/drivers/pci/controller/dwc/pci-samsung.c
new file mode 100644
index 000000000000..cc562a8694fb
--- /dev/null
+++ b/drivers/pci/controller/dwc/pci-samsung.c
@@ -0,0 +1,443 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe host controller driver for Samsung SoCs
+ *
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ *		https://www.samsung.com
+ *
+ * Author: Jingoo Han <jg1.han@samsung.com>
+ *	   Jaehoon Chung <jh80.chung@samsung.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/of_device.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+#include <linux/regulator/consumer.h>
+#include <linux/module.h>
+
+#include "pcie-designware.h"
+
+#define to_exynos_pcie(x)	dev_get_drvdata((x)->dev)
+
+/* PCIe ELBI registers */
+#define PCIE_IRQ_PULSE			0x000
+#define IRQ_INTA_ASSERT			BIT(0)
+#define IRQ_INTB_ASSERT			BIT(2)
+#define IRQ_INTC_ASSERT			BIT(4)
+#define IRQ_INTD_ASSERT			BIT(6)
+#define PCIE_IRQ_LEVEL			0x004
+#define PCIE_IRQ_SPECIAL		0x008
+#define PCIE_IRQ_EN_PULSE		0x00c
+#define PCIE_IRQ_EN_LEVEL		0x010
+#define PCIE_IRQ_EN_SPECIAL		0x014
+#define PCIE_SW_WAKE			0x018
+#define PCIE_BUS_EN			BIT(1)
+#define PCIE_CORE_RESET			0x01c
+#define PCIE_CORE_RESET_ENABLE		BIT(0)
+#define PCIE_STICKY_RESET		0x020
+#define PCIE_NONSTICKY_RESET		0x024
+#define PCIE_APP_INIT_RESET		0x028
+#define PCIE_APP_LTSSM_ENABLE		0x02c
+#define PCIE_ELBI_RDLH_LINKUP		0x074
+#define PCIE_ELBI_XMLH_LINKUP		BIT(4)
+#define PCIE_ELBI_LTSSM_ENABLE		0x1
+#define PCIE_ELBI_SLV_AWMISC		0x11c
+#define PCIE_ELBI_SLV_ARMISC		0x120
+#define PCIE_ELBI_SLV_DBI_ENABLE	BIT(21)
+
+struct exynos_pcie {
+	struct dw_pcie			pci;
+	void __iomem			*elbi_base;
+	struct clk			*clk;
+	struct clk			*bus_clk;
+	struct phy			*phy;
+	struct regulator_bulk_data	supplies[2];
+};
+
+static int exynos_pcie_init_clk_resources(struct exynos_pcie *ep)
+{
+	struct device *dev = ep->pci.dev;
+	int ret;
+
+	ret = clk_prepare_enable(ep->clk);
+	if (ret) {
+		dev_err(dev, "cannot enable pcie rc clock");
+		return ret;
+	}
+
+	ret = clk_prepare_enable(ep->bus_clk);
+	if (ret) {
+		dev_err(dev, "cannot enable pcie bus clock");
+		goto err_bus_clk;
+	}
+
+	return 0;
+
+err_bus_clk:
+	clk_disable_unprepare(ep->clk);
+
+	return ret;
+}
+
+static void exynos_pcie_deinit_clk_resources(struct exynos_pcie *ep)
+{
+	clk_disable_unprepare(ep->bus_clk);
+	clk_disable_unprepare(ep->clk);
+}
+
+static void exynos_pcie_writel(void __iomem *base, u32 val, u32 reg)
+{
+	writel(val, base + reg);
+}
+
+static u32 exynos_pcie_readl(void __iomem *base, u32 reg)
+{
+	return readl(base + reg);
+}
+
+static void exynos_pcie_sideband_dbi_w_mode(struct exynos_pcie *ep, bool on)
+{
+	u32 val;
+
+	val = exynos_pcie_readl(ep->elbi_base, PCIE_ELBI_SLV_AWMISC);
+	if (on)
+		val |= PCIE_ELBI_SLV_DBI_ENABLE;
+	else
+		val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
+	exynos_pcie_writel(ep->elbi_base, val, PCIE_ELBI_SLV_AWMISC);
+}
+
+static void exynos_pcie_sideband_dbi_r_mode(struct exynos_pcie *ep, bool on)
+{
+	u32 val;
+
+	val = exynos_pcie_readl(ep->elbi_base, PCIE_ELBI_SLV_ARMISC);
+	if (on)
+		val |= PCIE_ELBI_SLV_DBI_ENABLE;
+	else
+		val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
+	exynos_pcie_writel(ep->elbi_base, val, PCIE_ELBI_SLV_ARMISC);
+}
+
+static void exynos_pcie_assert_core_reset(struct exynos_pcie *ep)
+{
+	u32 val;
+
+	val = exynos_pcie_readl(ep->elbi_base, PCIE_CORE_RESET);
+	val &= ~PCIE_CORE_RESET_ENABLE;
+	exynos_pcie_writel(ep->elbi_base, val, PCIE_CORE_RESET);
+	exynos_pcie_writel(ep->elbi_base, 0, PCIE_STICKY_RESET);
+	exynos_pcie_writel(ep->elbi_base, 0, PCIE_NONSTICKY_RESET);
+}
+
+static void exynos_pcie_deassert_core_reset(struct exynos_pcie *ep)
+{
+	u32 val;
+
+	val = exynos_pcie_readl(ep->elbi_base, PCIE_CORE_RESET);
+	val |= PCIE_CORE_RESET_ENABLE;
+
+	exynos_pcie_writel(ep->elbi_base, val, PCIE_CORE_RESET);
+	exynos_pcie_writel(ep->elbi_base, 1, PCIE_STICKY_RESET);
+	exynos_pcie_writel(ep->elbi_base, 1, PCIE_NONSTICKY_RESET);
+	exynos_pcie_writel(ep->elbi_base, 1, PCIE_APP_INIT_RESET);
+	exynos_pcie_writel(ep->elbi_base, 0, PCIE_APP_INIT_RESET);
+}
+
+static int exynos_pcie_start_link(struct dw_pcie *pci)
+{
+	struct exynos_pcie *ep = to_exynos_pcie(pci);
+	u32 val;
+
+	val = exynos_pcie_readl(ep->elbi_base, PCIE_SW_WAKE);
+	val &= ~PCIE_BUS_EN;
+	exynos_pcie_writel(ep->elbi_base, val, PCIE_SW_WAKE);
+
+	/* assert LTSSM enable */
+	exynos_pcie_writel(ep->elbi_base, PCIE_ELBI_LTSSM_ENABLE,
+			  PCIE_APP_LTSSM_ENABLE);
+	return 0;
+}
+
+static void exynos_pcie_clear_irq_pulse(struct exynos_pcie *ep)
+{
+	u32 val = exynos_pcie_readl(ep->elbi_base, PCIE_IRQ_PULSE);
+
+	exynos_pcie_writel(ep->elbi_base, val, PCIE_IRQ_PULSE);
+}
+
+static irqreturn_t exynos_pcie_irq_handler(int irq, void *arg)
+{
+	struct exynos_pcie *ep = arg;
+
+	exynos_pcie_clear_irq_pulse(ep);
+	return IRQ_HANDLED;
+}
+
+static void exynos_pcie_enable_irq_pulse(struct exynos_pcie *ep)
+{
+	u32 val = IRQ_INTA_ASSERT | IRQ_INTB_ASSERT |
+		  IRQ_INTC_ASSERT | IRQ_INTD_ASSERT;
+
+	exynos_pcie_writel(ep->elbi_base, val, PCIE_IRQ_EN_PULSE);
+	exynos_pcie_writel(ep->elbi_base, 0, PCIE_IRQ_EN_LEVEL);
+	exynos_pcie_writel(ep->elbi_base, 0, PCIE_IRQ_EN_SPECIAL);
+}
+
+static u32 exynos_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base,
+				u32 reg, size_t size)
+{
+	struct exynos_pcie *ep = to_exynos_pcie(pci);
+	u32 val;
+
+	exynos_pcie_sideband_dbi_r_mode(ep, true);
+	dw_pcie_read(base + reg, size, &val);
+	exynos_pcie_sideband_dbi_r_mode(ep, false);
+	return val;
+}
+
+static void exynos_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base,
+				  u32 reg, size_t size, u32 val)
+{
+	struct exynos_pcie *ep = to_exynos_pcie(pci);
+
+	exynos_pcie_sideband_dbi_w_mode(ep, true);
+	dw_pcie_write(base + reg, size, val);
+	exynos_pcie_sideband_dbi_w_mode(ep, false);
+}
+
+static int exynos_pcie_rd_own_conf(struct pci_bus *bus, unsigned int devfn,
+				   int where, int size, u32 *val)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata);
+
+	if (PCI_SLOT(devfn))
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	*val = dw_pcie_read_dbi(pci, where, size);
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int exynos_pcie_wr_own_conf(struct pci_bus *bus, unsigned int devfn,
+				   int where, int size, u32 val)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata);
+
+	if (PCI_SLOT(devfn))
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	dw_pcie_write_dbi(pci, where, size, val);
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops exynos_pci_ops = {
+	.read = exynos_pcie_rd_own_conf,
+	.write = exynos_pcie_wr_own_conf,
+};
+
+static int exynos_pcie_link_up(struct dw_pcie *pci)
+{
+	struct exynos_pcie *ep = to_exynos_pcie(pci);
+	u32 val = exynos_pcie_readl(ep->elbi_base, PCIE_ELBI_RDLH_LINKUP);
+
+	return (val & PCIE_ELBI_XMLH_LINKUP);
+}
+
+static int exynos_pcie_host_init(struct dw_pcie_rp *pp)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct exynos_pcie *ep = to_exynos_pcie(pci);
+
+	pp->bridge->ops = &exynos_pci_ops;
+
+	exynos_pcie_assert_core_reset(ep);
+
+	phy_init(ep->phy);
+	phy_power_on(ep->phy);
+
+	exynos_pcie_deassert_core_reset(ep);
+	exynos_pcie_enable_irq_pulse(ep);
+
+	return 0;
+}
+
+static const struct dw_pcie_host_ops exynos_pcie_host_ops = {
+	.host_init = exynos_pcie_host_init,
+};
+
+static int exynos_add_pcie_port(struct exynos_pcie *ep,
+				       struct platform_device *pdev)
+{
+	struct dw_pcie *pci = &ep->pci;
+	struct dw_pcie_rp *pp = &pci->pp;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	pp->irq = platform_get_irq(pdev, 0);
+	if (pp->irq < 0)
+		return pp->irq;
+
+	ret = devm_request_irq(dev, pp->irq, exynos_pcie_irq_handler,
+			       IRQF_SHARED, "exynos-pcie", ep);
+	if (ret) {
+		dev_err(dev, "failed to request irq\n");
+		return ret;
+	}
+
+	pp->ops = &exynos_pcie_host_ops;
+	pp->msi_irq[0] = -ENODEV;
+
+	ret = dw_pcie_host_init(pp);
+	if (ret) {
+		dev_err(dev, "failed to initialize host\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct dw_pcie_ops dw_pcie_ops = {
+	.read_dbi = exynos_pcie_read_dbi,
+	.write_dbi = exynos_pcie_write_dbi,
+	.link_up = exynos_pcie_link_up,
+	.start_link = exynos_pcie_start_link,
+};
+
+static int exynos_pcie_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct exynos_pcie *ep;
+	struct device_node *np = dev->of_node;
+	int ret;
+
+	ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
+	if (!ep)
+		return -ENOMEM;
+
+	ep->pci.dev = dev;
+	ep->pci.ops = &dw_pcie_ops;
+
+	ep->phy = devm_of_phy_get(dev, np, NULL);
+	if (IS_ERR(ep->phy))
+		return PTR_ERR(ep->phy);
+
+	/* External Local Bus interface (ELBI) registers */
+	ep->elbi_base = devm_platform_ioremap_resource_byname(pdev, "elbi");
+	if (IS_ERR(ep->elbi_base))
+		return PTR_ERR(ep->elbi_base);
+
+	ep->clk = devm_clk_get(dev, "pcie");
+	if (IS_ERR(ep->clk)) {
+		dev_err(dev, "Failed to get pcie rc clock\n");
+		return PTR_ERR(ep->clk);
+	}
+
+	ep->bus_clk = devm_clk_get(dev, "pcie_bus");
+	if (IS_ERR(ep->bus_clk)) {
+		dev_err(dev, "Failed to get pcie bus clock\n");
+		return PTR_ERR(ep->bus_clk);
+	}
+
+	ep->supplies[0].supply = "vdd18";
+	ep->supplies[1].supply = "vdd10";
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ep->supplies),
+				      ep->supplies);
+	if (ret)
+		return ret;
+
+	ret = exynos_pcie_init_clk_resources(ep);
+	if (ret)
+		return ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ep->supplies), ep->supplies);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, ep);
+
+	ret = exynos_add_pcie_port(ep, pdev);
+	if (ret < 0)
+		goto fail_probe;
+
+	return 0;
+
+fail_probe:
+	phy_exit(ep->phy);
+	exynos_pcie_deinit_clk_resources(ep);
+	regulator_bulk_disable(ARRAY_SIZE(ep->supplies), ep->supplies);
+
+	return ret;
+}
+
+static int __exit exynos_pcie_remove(struct platform_device *pdev)
+{
+	struct exynos_pcie *ep = platform_get_drvdata(pdev);
+
+	dw_pcie_host_deinit(&ep->pci.pp);
+	exynos_pcie_assert_core_reset(ep);
+	phy_power_off(ep->phy);
+	phy_exit(ep->phy);
+	exynos_pcie_deinit_clk_resources(ep);
+	regulator_bulk_disable(ARRAY_SIZE(ep->supplies), ep->supplies);
+
+	return 0;
+}
+
+static int exynos_pcie_suspend_noirq(struct device *dev)
+{
+	struct exynos_pcie *ep = dev_get_drvdata(dev);
+
+	exynos_pcie_assert_core_reset(ep);
+	phy_power_off(ep->phy);
+	phy_exit(ep->phy);
+	regulator_bulk_disable(ARRAY_SIZE(ep->supplies), ep->supplies);
+
+	return 0;
+}
+
+static int exynos_pcie_resume_noirq(struct device *dev)
+{
+	struct exynos_pcie *ep = dev_get_drvdata(dev);
+	struct dw_pcie *pci = &ep->pci;
+	struct dw_pcie_rp *pp = &pci->pp;
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ep->supplies), ep->supplies);
+	if (ret)
+		return ret;
+
+	/* exynos_pcie_host_init controls ep->phy */
+	exynos_pcie_host_init(pp);
+	dw_pcie_setup_rc(pp);
+	exynos_pcie_start_link(pci);
+	return dw_pcie_wait_for_link(pci);
+}
+
+static const struct dev_pm_ops exynos_pcie_pm_ops = {
+	NOIRQ_SYSTEM_SLEEP_PM_OPS(exynos_pcie_suspend_noirq,
+				  exynos_pcie_resume_noirq)
+};
+
+static const struct of_device_id exynos_pcie_of_match[] = {
+	{ .compatible = "samsung,exynos5433-pcie", },
+	{ },
+};
+
+static struct platform_driver exynos_pcie_driver = {
+	.probe		= exynos_pcie_probe,
+	.remove		= __exit_p(exynos_pcie_remove),
+	.driver = {
+		.name	= "exynos-pcie",
+		.of_match_table = exynos_pcie_of_match,
+		.pm		= &exynos_pcie_pm_ops,
+	},
+};
+module_platform_driver(exynos_pcie_driver);
+MODULE_LICENSE("GPL v2");
+MODULE_DEVICE_TABLE(of, exynos_pcie_of_match);