Hello Jaehoon, Às 5:20 AM de 12/26/2016, Jaehoon Chung escreveu: > Exynos5433 supports the PCIe. > This patch adds new pci-exynos5433.c file for Exynos ARM64. > > Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx> > --- > drivers/pci/host/Kconfig | 9 + > drivers/pci/host/Makefile | 1 + > drivers/pci/host/pci-exynos5433.c | 338 ++++++++++++++++++++++++++++++++++++++ > 3 files changed, 348 insertions(+) > create mode 100644 drivers/pci/host/pci-exynos5433.c > > diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig > index d7e7c0a..3d77d0b 100644 > --- a/drivers/pci/host/Kconfig > +++ b/drivers/pci/host/Kconfig > @@ -60,6 +60,15 @@ config PCI_EXYNOS > select PCIEPORTBUS > select PCIE_DW > > +config PCI_EXYNOS5433 > + bool "Samsung Exynos5433 PCIe controller" > + depends on ARCH_EXYNOS && ARM64 > + depends on PCI_MSI_IRQ_DOMAIN > + select PCIEPORTBUS > + select PCIE_DW > + help > + If you want support for Exynos5433 PCIe host controller, say Y. > + > config PCI_IMX6 > bool "Freescale i.MX6 PCIe controller" > depends on SOC_IMX6Q > diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile > index 084cb49..2168de2 100644 > --- a/drivers/pci/host/Makefile > +++ b/drivers/pci/host/Makefile > @@ -2,6 +2,7 @@ obj-$(CONFIG_PCIE_DW) += pcie-designware.o > obj-$(CONFIG_PCIE_DW_PLAT) += pcie-designware-plat.o > obj-$(CONFIG_PCI_DRA7XX) += pci-dra7xx.o > obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o > +obj-$(CONFIG_PCI_EXYNOS5433) += pci-exynos5433.o > obj-$(CONFIG_PCI_IMX6) += pci-imx6.o > obj-$(CONFIG_PCI_HYPERV) += pci-hyperv.o > obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o > diff --git a/drivers/pci/host/pci-exynos5433.c b/drivers/pci/host/pci-exynos5433.c > new file mode 100644 > index 0000000..ff254ca > --- /dev/null > +++ b/drivers/pci/host/pci-exynos5433.c > @@ -0,0 +1,338 @@ > +/* > + * PCIe host controller driver for Samsung EXYNOS5433 SoCs > + * > + * Copyright (C) 2016 Samsung Electronics Co., Ltd. > + * https://urldefense.proofpoint.com/v2/url?u=http-3A__www.samsung.com&d=DgIBAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=s2fO0hii0OGNOv9qQy_HRXy-xAJUD1NNoEcc3io_kx0&m=fUwnZks1U2AwaOxMkLdSnE700sfQXpB3WAg_EJw7NaE&s=IwRYD8maTuXG57Q0qlAmFNh3_TSfUTE27xq8p13FFKI&e= > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 as > + * published by the Free Software Foundation. > + */ > + > +#include <linux/clk.h> > +#include <linux/gpio.h> > +#include <linux/delay.h> > +#include <linux/interrupt.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/of_gpio.h> > +#include <linux/pci.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > +#include <linux/resource.h> > +#include <linux/signal.h> > +#include <linux/types.h> > +#include <linux/mfd/syscon.h> > +#include <linux/phy/phy.h> > + > +#include "pcie-designware.h" > + > +#define to_exynos_pcie(x) container_of(x, struct exynos_pcie, pp) > + > +/* Pcie structure for Exynos specific data */ > +struct exynos_pcie { > + void __iomem *elbi_base; > + struct clk *clk; > + struct clk *bus_clk; > + struct pcie_port pp; > + struct phy *phy; > +}; > + > +/* 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 IRQ_INTX_ASSERT (IRQ_INTA_ASSERT | IRQ_INTB_ASSERT | \ > + IRQ_INTC_ASSERT | IRQ_INTD_ASSERT) > +#define PCIE_IRQ_EN_PULSE 0x00c > +#define PCIE_IRQ_EN_LEVEL 0x010 > +#define PCIE_SW_WAKE 0x018 > +#define PCIE_BUS_EN BIT(1) > +#define PCIE_APP_LTSSM_ENABLE 0x02c > +#define PCIE_ELBI_LTSSM_ENABLE 0x1 > +#define PCIE_ELBI_DEBUG_L 0x074 > +#define PCIE_ELBI_XMLH_LINK_UP BIT(4) > +#define PCIE_ELBI_SLV_AWMISC 0x11c > +#define PCIE_ELBI_SLV_ARMISC 0x120 > +#define PCIE_ELBI_SLV_DBI_ENABLE BIT(21) > + > +/* DBI register */ > +#define PCIE_MISC_CONTROL_1_OFF 0x8BC > +#define DBI_RO_WR_EN BIT(0) > + > +static inline void exynos_pcie_writel(void __iomem *base, u32 val, u32 offset) > +{ > + writel(val, base + offset); > +} > + > +static inline u32 exynos_pcie_readl(void __iomem *base, u32 offset) > +{ > + return readl(base + offset); > +} > + > +static void exynos_pcie_clear_irq_pulse(struct exynos_pcie *ep) > +{ > + u32 val; > + > + val = exynos_pcie_readl(ep->elbi_base, PCIE_IRQ_PULSE); > + val &= ~IRQ_INTX_ASSERT; > + exynos_pcie_writel(ep->elbi_base, val, PCIE_IRQ_PULSE); > +} > + > +static void exynos_pcie_enable_irq_pulse(struct exynos_pcie *ep) > +{ > + exynos_pcie_writel(ep->elbi_base, IRQ_INTX_ASSERT, PCIE_IRQ_EN_PULSE); > + > + /* Clear PCIE_IRQ_EN_LEVEL register */ > + exynos_pcie_writel(ep->elbi_base, 0, PCIE_IRQ_EN_LEVEL); > +} > + > +static irqreturn_t exynos_pcie_irq_handler(int irq, void *arg) > +{ > + struct pcie_port *pp = arg; > + struct exynos_pcie *ep = to_exynos_pcie(pp); > + > + exynos_pcie_clear_irq_pulse(ep); > + > + return IRQ_HANDLED; > +} > + > +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 int exynos_pcie_establish_link(struct exynos_pcie *ep) > +{ > + struct pcie_port *pp = &ep->pp; > + u32 val; > + > + if (dw_pcie_link_up(pp)) { > + dev_info(pp->dev, "Link already up\n"); > + return 0; > + } > + > + phy_power_on(ep->phy); > + > + /* Exynos Pcie assert PHY reset and init */ > + phy_init(ep->phy); > + > + val = exynos_pcie_readl(ep->elbi_base, PCIE_SW_WAKE); > + val &= ~PCIE_BUS_EN; > + exynos_pcie_writel(ep->elbi_base, val, PCIE_SW_WAKE); > + > + /* > + * Enable DBI_RO_WR_EN bit. > + * - When set to 1, some RO and HWinit bits are wriatble from > + * the local application through the DBI. > + */ > + dw_pcie_writel_rc(pp, PCIE_MISC_CONTROL_1_OFF, DBI_RO_WR_EN); > + > + /* Setup root complex */ > + dw_pcie_setup_rc(pp); > + > + /* assert LTSSM enable */ > + exynos_pcie_writel(ep->elbi_base, PCIE_ELBI_LTSSM_ENABLE, > + PCIE_APP_LTSSM_ENABLE); > + > + return dw_pcie_wait_for_link(pp); > +} > + > + > +static int exynos_pcie_link_up(struct pcie_port *pp) > +{ > + struct exynos_pcie *ep = to_exynos_pcie(pp); > + u32 val; > + > + /* Check the Receive Transaction Layer Handler */ > + val = exynos_pcie_readl(ep->elbi_base, PCIE_ELBI_DEBUG_L); > + > + return (val & PCIE_ELBI_XMLH_LINK_UP); > +} > + > +static void exynos_pcie_host_init(struct pcie_port *pp) > +{ > + struct exynos_pcie *ep = to_exynos_pcie(pp); > + > + exynos_pcie_enable_irq_pulse(ep); > + exynos_pcie_establish_link(ep); > +} Your *_host_init callback should return to pci-designware its error/success status. There is a recent patch that added this capability to all vendor specific drivers that use pcie-designware. Please check it out and follow the same approach: https://patchwork.kernel.org/patch/9464223/ Thanks, Joao > + > +static u32 exynos_pcie_readl_rc(struct pcie_port *pp, u32 reg) > +{ > + struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp); > + u32 val; > + > + exynos_pcie_sideband_dbi_r_mode(exynos_pcie, true); > + val = readl(pp->dbi_base + reg); > + exynos_pcie_sideband_dbi_r_mode(exynos_pcie, false); > + return val; > +} > + > +static void exynos_pcie_writel_rc(struct pcie_port *pp, u32 reg, u32 val) > +{ > + struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp); > + > + exynos_pcie_sideband_dbi_w_mode(exynos_pcie, true); > + writel(val, pp->dbi_base + reg); > + exynos_pcie_sideband_dbi_w_mode(exynos_pcie, false); > +} > + > +static int exynos_pcie_rd_own_conf(struct pcie_port *pp, int where, int size, > + u32 *val) > +{ > + struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp); > + int ret; > + > + exynos_pcie_sideband_dbi_r_mode(exynos_pcie, true); > + ret = dw_pcie_cfg_read(pp->dbi_base + where, size, val); > + exynos_pcie_sideband_dbi_r_mode(exynos_pcie, false); > + return ret; > +} > + > +static int exynos_pcie_wr_own_conf(struct pcie_port *pp, int where, int size, > + u32 val) > +{ > + struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp); > + int ret; > + > + exynos_pcie_sideband_dbi_w_mode(exynos_pcie, true); > + ret = dw_pcie_cfg_write(pp->dbi_base + where, size, val); > + exynos_pcie_sideband_dbi_w_mode(exynos_pcie, false); > + return ret; > +} > + > +static struct pcie_host_ops exynos_pcie_host_ops = { > + .readl_rc = exynos_pcie_readl_rc, > + .writel_rc = exynos_pcie_writel_rc, > + .rd_own_conf = exynos_pcie_rd_own_conf, > + .wr_own_conf = exynos_pcie_wr_own_conf, > + .host_init = exynos_pcie_host_init, > + .link_up = exynos_pcie_link_up, > +}; > + > +static int __init exynos_pcie_probe(struct platform_device *pdev) > +{ > + struct exynos_pcie *exynos_pcie; > + struct pcie_port *pp; > + struct resource *res; > + int ret; > + > + exynos_pcie = devm_kzalloc(&pdev->dev, sizeof(*exynos_pcie), > + GFP_KERNEL); > + if (!exynos_pcie) > + return -ENOMEM; > + > + pp = &exynos_pcie->pp; > + pp->dev = &pdev->dev; > + > + exynos_pcie->clk = devm_clk_get(&pdev->dev, "pcie"); > + if (IS_ERR(exynos_pcie->clk)) { > + dev_err(&pdev->dev, "Failed to get pcie rc clock\n"); > + return PTR_ERR(exynos_pcie->clk); > + } > + ret = clk_prepare_enable(exynos_pcie->clk); > + if (ret) > + return ret; > + > + exynos_pcie->bus_clk = devm_clk_get(&pdev->dev, "pcie_bus"); > + if (IS_ERR(exynos_pcie->bus_clk)) { > + dev_err(&pdev->dev, "Failed to get pcie bus clock\n"); > + ret = PTR_ERR(exynos_pcie->bus_clk); > + goto fail_clk; > + } > + ret = clk_prepare_enable(exynos_pcie->bus_clk); > + if (ret) > + goto fail_clk; > + > + /* External Local Bus interface(ELBI) Register */ > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi"); > + exynos_pcie->elbi_base = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(exynos_pcie->elbi_base)) { > + ret = PTR_ERR(exynos_pcie->elbi_base); > + goto fail_bus_clk; > + } > + > + /* Data Bus Interface(DBI) Register */ > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi"); > + pp->dbi_base = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(pp->dbi_base)) { > + ret = PTR_ERR(pp->dbi_base); > + goto fail_bus_clk; > + } > + > + exynos_pcie->phy = devm_phy_get(&pdev->dev, "pcie-phy"); > + if (IS_ERR(exynos_pcie->phy)) { > + if (PTR_ERR(exynos_pcie->phy) != -EPROBE_DEFER) > + dev_err(&pdev->dev, "Can't find the pcie-phy\n"); > + return PTR_ERR(exynos_pcie->phy); > + } > + > + pp->irq = platform_get_irq_byname(pdev, "intr"); > + if (!pp->irq) { > + dev_err(&pdev->dev, "failed to get irq\n"); > + ret = -ENODEV; > + goto fail_bus_clk; > + } > + ret = devm_request_irq(&pdev->dev, pp->irq, exynos_pcie_irq_handler, > + IRQF_SHARED, "exynos-pcie", exynos_pcie); > + if (ret) { > + dev_err(&pdev->dev, "failed to request irq\n"); > + goto fail_bus_clk; > + } > + > + pp->root_bus_nr = -1; > + pp->ops = &exynos_pcie_host_ops; > + > + ret = dw_pcie_host_init(pp); > + if (ret) { > + dev_err(&pdev->dev, "failed to initialize host\n"); > + goto fail_bus_clk; > + } > + > + platform_set_drvdata(pdev, exynos_pcie); > + > + return 0; > + > +fail_bus_clk: > + clk_disable_unprepare(exynos_pcie->bus_clk); > +fail_clk: > + clk_disable_unprepare(exynos_pcie->clk); > + return ret; > +} > + > +static const struct of_device_id exynos_pcie_of_match[] = { > + { .compatible = "samsung,exynos5433-pcie", }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, exynos_pcie_of_match); > + > +static struct platform_driver exynos_pcie_driver = { > + .probe = exynos_pcie_probe, > + .driver = { > + .name = "exynos5433-pcie", > + .of_match_table = exynos_pcie_of_match, > + }, > +}; > +builtin_platform_driver(exynos_pcie_driver); > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
