| Message ID | 20170531070109.81569-4-songxiaowei@hisilicon.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Wednesday, May 31, 2017 3:01 AM, Xiaowei Song wrote: > > Hisilicon PCIe Driver shares the common functions for PCIe dw-host > > The poweron functions is developed on hi3660 SoC, > while Others Functions are common for Kirin series SoCs. > > Low power mode (L1 sub-state and Suspend/Resume), hotplug > and MSI feature are not supported currently. > > Cc: Guodong Xu <guodong.xu@linaro.org> > Signed-off-by: Xiaowei Song <songxiaowei@hisilicon.com> Reviewed-by: Jingoo Han <jingoohan1@gmail.com> Best regards, Jingoo Han > --- > drivers/pci/dwc/Kconfig | 10 + > drivers/pci/dwc/Makefile | 1 + > drivers/pci/dwc/pcie-kirin.c | 514 > +++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 525 insertions(+) > create mode 100644 drivers/pci/dwc/pcie-kirin.c > > diff --git a/drivers/pci/dwc/Kconfig b/drivers/pci/dwc/Kconfig > index d2d2ba5b8a68..afecfb2b6ff4 100644 > --- a/drivers/pci/dwc/Kconfig > +++ b/drivers/pci/dwc/Kconfig > @@ -130,4 +130,14 @@ config PCIE_ARTPEC6 > Say Y here to enable PCIe controller support on Axis ARTPEC-6 > SoCs. This PCIe controller uses the DesignWare core. > > +config PCIE_KIRIN > + depends on OF && ARM64 > + bool "HiSilicon Kirin series SoCs PCIe controllers" > + depends on PCI > + select PCIEPORTBUS > + select PCIE_DW_HOST > + help > + Say Y here if you want PCIe controller support > + on HiSilicon Kirin series SoCs. > + > endmenu > diff --git a/drivers/pci/dwc/Makefile b/drivers/pci/dwc/Makefile > index a2df13c28798..4bd69bacd4ab 100644 > --- a/drivers/pci/dwc/Makefile > +++ b/drivers/pci/dwc/Makefile > @@ -10,6 +10,7 @@ obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o > obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o > obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o > obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o > +obj-$(CONFIG_PCIE_KIRIN) += pcie-kirin.o > > # The following drivers are for devices that use the generic ACPI > # pci_root.c driver but don't support standard ECAM config access. > diff --git a/drivers/pci/dwc/pcie-kirin.c b/drivers/pci/dwc/pcie-kirin.c > new file mode 100644 > index 000000000000..f63e6548efae > --- /dev/null > +++ b/drivers/pci/dwc/pcie-kirin.c > @@ -0,0 +1,514 @@ > +/* > + * PCIe host controller driver for Kirin Phone SoCs > + * > + * Copyright (C) 2017 Hilisicon Electronics Co., Ltd. > + * http://www.huawei.com > + * > + * Author: Xiaowei Song <songxiaowei@huawei.com> > + * > + * 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 <asm/compiler.h> > +#include <linux/compiler.h> > +#include <linux/clk.h> > +#include <linux/delay.h> > +#include <linux/err.h> > +#include <linux/gpio.h> > +#include <linux/interrupt.h> > +#include <linux/mfd/syscon.h> > +#include <linux/of_address.h> > +#include <linux/of_gpio.h> > +#include <linux/of_pci.h> > +#include <linux/pci.h> > +#include <linux/pci_regs.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > +#include <linux/resource.h> > +#include <linux/types.h> > +#include "pcie-designware.h" > + > +#define to_kirin_pcie(x) dev_get_drvdata((x)->dev) > + > +#define REF_CLK_FREQ 100000000 > + > +/* PCIe ELBI registers */ > +#define SOC_PCIECTRL_CTRL0_ADDR 0x000 > +#define SOC_PCIECTRL_CTRL1_ADDR 0x004 > +#define SOC_PCIEPHY_CTRL2_ADDR 0x008 > +#define SOC_PCIEPHY_CTRL3_ADDR 0x00c > +#define PCIE_ELBI_SLV_DBI_ENABLE (0x1 << 21) > + > +/* info located in APB */ > +#define PCIE_APP_LTSSM_ENABLE 0x01c > +#define PCIE_APB_PHY_CTRL0 0x0 > +#define PCIE_APB_PHY_CTRL1 0x4 > +#define PCIE_APB_PHY_STATUS0 0x400 > +#define PCIE_LINKUP_ENABLE (0x8020) > +#define PCIE_LTSSM_ENABLE_BIT (0x1 << 11) > +#define PIPE_CLK_STABLE (0x1 << 19) > +#define PIPE_CLK_MAX_TRY_TIMES 10 > +#define PHY_REF_PAD_BIT (0x1 << 8) > +#define PHY_PWR_DOWN_BIT (0x1 << 22) > +#define PHY_RST_ACK_BIT (0x1 << 16) > + > +/* info located in sysctrl */ > +#define SCTRL_PCIE_CMOS_OFFSET 0x60 > +#define SCTRL_PCIE_CMOS_BIT 0x10 > +#define SCTRL_PCIE_ISO_OFFSET 0x44 > +#define SCTRL_PCIE_ISO_BIT 0x30 > +#define SCTRL_PCIE_HPCLK_OFFSET 0x190 > +#define SCTRL_PCIE_HPCLK_BIT 0x184000 > +#define SCTRL_PCIE_OE_OFFSET 0x14a > +#define PCIE_DEBOUNCE_PARAM 0xF0F400 > +#define PCIE_OE_BYPASS (0x3 << 28) > + > +/* peri_crg ctrl */ > +#define CRGCTRL_PCIE_ASSERT_OFFSET 0x88 > +#define CRGCTRL_PCIE_ASSERT_BIT 0x8c000000 > + > +/* Time for delay */ > +#define REF_2_PERST_MIN 20000 > +#define REF_2_PERST_MAX 25000 > +#define PERST_2_ACCESS_MIN 10000 > +#define PERST_2_ACCESS_MAX 12000 > +#define LINK_WAIT_MIN 900 > +#define LINK_WAIT_MAX 1000 > +#define PIPE_CLK_WAIT_MIN 550 > +#define PIPE_CLK_WAIT_MAX 600 > + > +struct kirin_pcie { > + struct dw_pcie *pci; > + void __iomem *apb_base; > + void __iomem *phy_base; > + struct regmap *crgctrl; > + struct regmap *sysctrl; > + struct clk *apb_sys_clk; > + struct clk *apb_phy_clk; > + struct clk *phy_ref_clk; > + struct clk *pcie_aclk; > + struct clk *pcie_aux_clk; > + int gpio_id_reset; > +}; > + > +/* Registers in PCIeCTRL */ > +static inline void kirin_apb_ctrl_writel(struct kirin_pcie *kirin_pcie, > + u32 val, u32 reg) > +{ > + writel(val, kirin_pcie->apb_base + reg); > +} > + > +static inline u32 kirin_apb_ctrl_readl(struct kirin_pcie *kirin_pcie, u32 > reg) > +{ > + return readl(kirin_pcie->apb_base + reg); > +} > + > +/* Registers in PCIePHY */ > +static inline void kirin_apb_phy_writel(struct kirin_pcie *kirin_pcie, > + u32 val, u32 reg) > +{ > + writel(val, kirin_pcie->phy_base + reg); > +} > + > +static inline u32 kirin_apb_phy_readl(struct kirin_pcie *kirin_pcie, u32 > reg) > +{ > + return readl(kirin_pcie->phy_base + reg); > +} > + > +static long kirin_pcie_get_clk(struct kirin_pcie *kirin_pcie, > + struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + > + kirin_pcie->phy_ref_clk = devm_clk_get(dev, "pcie_phy_ref"); > + if (IS_ERR(kirin_pcie->phy_ref_clk)) > + return PTR_ERR(kirin_pcie->phy_ref_clk); > + > + kirin_pcie->pcie_aux_clk = devm_clk_get(dev, "pcie_aux"); > + if (IS_ERR(kirin_pcie->pcie_aux_clk)) > + return PTR_ERR(kirin_pcie->pcie_aux_clk); > + > + kirin_pcie->apb_phy_clk = devm_clk_get(dev, "pcie_apb_phy"); > + if (IS_ERR(kirin_pcie->apb_phy_clk)) > + return PTR_ERR(kirin_pcie->apb_phy_clk); > + > + kirin_pcie->apb_sys_clk = devm_clk_get(dev, "pcie_apb_sys"); > + if (IS_ERR(kirin_pcie->apb_sys_clk)) > + return PTR_ERR(kirin_pcie->apb_sys_clk); > + > + kirin_pcie->pcie_aclk = devm_clk_get(dev, "pcie_aclk"); > + if (IS_ERR(kirin_pcie->pcie_aclk)) > + return PTR_ERR(kirin_pcie->pcie_aclk); > + > + return 0; > +} > + > +static long kirin_pcie_get_resource(struct kirin_pcie *kirin_pcie, > + struct platform_device *pdev) > +{ > + struct resource *apb; > + struct resource *phy; > + struct resource *dbi; > + struct device *dev = &pdev->dev; > + > + apb = platform_get_resource_byname(pdev, IORESOURCE_MEM, "apb"); > + kirin_pcie->apb_base = devm_ioremap_resource(dev, apb); > + if (IS_ERR(kirin_pcie->apb_base)) > + return PTR_ERR(kirin_pcie->apb_base); > + > + phy = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy"); > + kirin_pcie->phy_base = devm_ioremap_resource(dev, phy); > + if (IS_ERR(kirin_pcie->phy_base)) > + return PTR_ERR(kirin_pcie->phy_base); > + > + dbi = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi"); > + kirin_pcie->pci->dbi_base = devm_ioremap_resource(dev, dbi); > + if (IS_ERR(kirin_pcie->pci->dbi_base)) > + return PTR_ERR(kirin_pcie->pci->dbi_base); > + > + kirin_pcie->crgctrl = > + syscon_regmap_lookup_by_compatible("hisilicon,hi3660- > crgctrl"); > + if (IS_ERR(kirin_pcie->crgctrl)) > + return PTR_ERR(kirin_pcie->crgctrl); > + > + kirin_pcie->sysctrl = > + syscon_regmap_lookup_by_compatible("hisilicon,hi3660-sctrl"); > + if (IS_ERR(kirin_pcie->sysctrl)) > + return PTR_ERR(kirin_pcie->sysctrl); > + > + return 0; > +} > + > +static int kirin_pcie_phy_init(struct kirin_pcie *kirin_pcie) > +{ > + u32 reg_val; > + u32 time = PIPE_CLK_MAX_TRY_TIMES; > + > + reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL1); > + reg_val &= ~PHY_REF_PAD_BIT; > + kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL1); > + > + reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL0); > + reg_val &= ~PHY_PWR_DOWN_BIT; > + kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL0); > + udelay(10); > + > + reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL1); > + reg_val &= ~PHY_RST_ACK_BIT; > + kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL1); > + > + usleep_range(PIPE_CLK_WAIT_MIN, PIPE_CLK_WAIT_MAX); > + reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_STATUS0); > + if (reg_val & PIPE_CLK_STABLE) { > + dev_err(kirin_pcie->pci->dev, "PIPE clk is not stable\n"); > + return -EINVAL; > + } > + > + return 0; > +} > + > +static void kirin_pcie_oe_enable(struct kirin_pcie *kirin_pcie) > +{ > + u32 val; > + > + regmap_read(kirin_pcie->sysctrl, SCTRL_PCIE_OE_OFFSET, &val); > + val |= PCIE_DEBOUNCE_PARAM; > + val &= ~PCIE_OE_BYPASS; > + regmap_write(kirin_pcie->sysctrl, SCTRL_PCIE_OE_OFFSET, val); > +} > + > +static int kirin_pcie_clk_ctrl(struct kirin_pcie *kirin_pcie, bool enable) > +{ > + int ret = 0; > + > + if (!enable) > + goto close_clk; > + > + ret = clk_set_rate(kirin_pcie->phy_ref_clk, REF_CLK_FREQ); > + if (ret) > + return ret; > + > + ret = clk_prepare_enable(kirin_pcie->phy_ref_clk); > + if (ret) > + return ret; > + > + ret = clk_prepare_enable(kirin_pcie->apb_sys_clk); > + if (ret) > + goto apb_sys_fail; > + > + ret = clk_prepare_enable(kirin_pcie->apb_phy_clk); > + if (ret) > + goto apb_phy_fail; > + > + ret = clk_prepare_enable(kirin_pcie->pcie_aclk); > + if (ret) > + goto aclk_fail; > + > + ret = clk_prepare_enable(kirin_pcie->pcie_aux_clk); > + if (ret) > + goto aux_clk_fail; > + > + return 0; > + > +close_clk: > + clk_disable_unprepare(kirin_pcie->pcie_aux_clk); > +aux_clk_fail: > + clk_disable_unprepare(kirin_pcie->pcie_aclk); > +aclk_fail: > + clk_disable_unprepare(kirin_pcie->apb_phy_clk); > +apb_phy_fail: > + clk_disable_unprepare(kirin_pcie->apb_sys_clk); > +apb_sys_fail: > + clk_disable_unprepare(kirin_pcie->phy_ref_clk); > + > + return ret; > +} > + > +static int kirin_pcie_power_on(struct kirin_pcie *kirin_pcie) > +{ > + int ret; > + > + /* Power supply for Host */ > + regmap_write(kirin_pcie->sysctrl, > + SCTRL_PCIE_CMOS_OFFSET, SCTRL_PCIE_CMOS_BIT); > + udelay(100); > + kirin_pcie_oe_enable(kirin_pcie); > + > + ret = kirin_pcie_clk_ctrl(kirin_pcie, true); > + if (ret) > + return ret; > + > + /* ISO disable, PCIeCtrl, PHY assert and clk gate clear */ > + regmap_write(kirin_pcie->sysctrl, > + SCTRL_PCIE_ISO_OFFSET, SCTRL_PCIE_ISO_BIT); > + regmap_write(kirin_pcie->crgctrl, > + CRGCTRL_PCIE_ASSERT_OFFSET, CRGCTRL_PCIE_ASSERT_BIT); > + regmap_write(kirin_pcie->sysctrl, > + SCTRL_PCIE_HPCLK_OFFSET, SCTRL_PCIE_HPCLK_BIT); > + > + ret = kirin_pcie_phy_init(kirin_pcie); > + if (ret) > + goto close_clk; > + > + /* perst assert Endpoint */ > + if (!gpio_request(kirin_pcie->gpio_id_reset, "pcie_perst")) { > + usleep_range(REF_2_PERST_MIN, REF_2_PERST_MAX); > + ret = gpio_direction_output(kirin_pcie->gpio_id_reset, 1); > + if (ret) > + goto close_clk; > + usleep_range(PERST_2_ACCESS_MIN, PERST_2_ACCESS_MAX); > + > + return 0; > + } > + > +close_clk: > + kirin_pcie_clk_ctrl(kirin_pcie, false); > + return ret; > +} > + > +static void kirin_pcie_sideband_dbi_w_mode(struct kirin_pcie *kirin_pcie, > + bool on) > +{ > + u32 val; > + > + val = kirin_apb_ctrl_readl(kirin_pcie, SOC_PCIECTRL_CTRL0_ADDR); > + if (on) > + val = val | PCIE_ELBI_SLV_DBI_ENABLE; > + else > + val = val & ~PCIE_ELBI_SLV_DBI_ENABLE; > + > + kirin_apb_ctrl_writel(kirin_pcie, val, SOC_PCIECTRL_CTRL0_ADDR); > +} > + > +static void kirin_pcie_sideband_dbi_r_mode(struct kirin_pcie *kirin_pcie, > + bool on) > +{ > + u32 val; > + > + val = kirin_apb_ctrl_readl(kirin_pcie, SOC_PCIECTRL_CTRL1_ADDR); > + if (on) > + val = val | PCIE_ELBI_SLV_DBI_ENABLE; > + else > + val = val & ~PCIE_ELBI_SLV_DBI_ENABLE; > + > + kirin_apb_ctrl_writel(kirin_pcie, val, SOC_PCIECTRL_CTRL1_ADDR); > +} > + > +static int kirin_pcie_rd_own_conf(struct pcie_port *pp, > + int where, int size, u32 *val) > +{ > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > + struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); > + int ret; > + > + kirin_pcie_sideband_dbi_r_mode(kirin_pcie, true); > + ret = dw_pcie_read(pci->dbi_base + where, size, val); > + kirin_pcie_sideband_dbi_r_mode(kirin_pcie, false); > + > + return ret; > +} > + > +static int kirin_pcie_wr_own_conf(struct pcie_port *pp, > + int where, int size, u32 val) > +{ > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > + struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); > + int ret; > + > + kirin_pcie_sideband_dbi_w_mode(kirin_pcie, true); > + ret = dw_pcie_write(pci->dbi_base + where, size, val); > + kirin_pcie_sideband_dbi_w_mode(kirin_pcie, false); > + > + return ret; > +} > + > +static u32 kirin_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, > + u32 reg, size_t size) > +{ > + struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); > + u32 ret; > + > + kirin_pcie_sideband_dbi_r_mode(kirin_pcie, true); > + dw_pcie_read(base + reg, size, &ret); > + kirin_pcie_sideband_dbi_r_mode(kirin_pcie, false); > + > + return ret; > +} > + > +static void kirin_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, > + u32 reg, size_t size, u32 val) > +{ > + struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); > + > + kirin_pcie_sideband_dbi_w_mode(kirin_pcie, true); > + dw_pcie_write(base + reg, size, val); > + kirin_pcie_sideband_dbi_w_mode(kirin_pcie, false); > +} > + > +static int kirin_pcie_link_up(struct dw_pcie *pci) > +{ > + struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); > + u32 val = kirin_apb_ctrl_readl(kirin_pcie, PCIE_APB_PHY_STATUS0); > + > + if ((val & PCIE_LINKUP_ENABLE) == PCIE_LINKUP_ENABLE) > + return 1; > + > + return 0; > +} > + > +static int kirin_pcie_establish_link(struct pcie_port *pp) > +{ > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > + struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); > + int count = 0; > + > + if (kirin_pcie_link_up(pci)) > + return 0; > + > + dw_pcie_setup_rc(pp); > + > + /* assert LTSSM enable */ > + kirin_apb_ctrl_writel(kirin_pcie, PCIE_LTSSM_ENABLE_BIT, > + PCIE_APP_LTSSM_ENABLE); > + > + /* check if the link is up or not */ > + while (!kirin_pcie_link_up(pci)) { > + usleep_range(LINK_WAIT_MIN, LINK_WAIT_MAX); > + count++; > + if (count == 1000) { > + dev_err(pci->dev, "Link Fail\n"); > + return -EINVAL; > + } > + } > + > + return 0; > +} > + > +static void kirin_pcie_host_init(struct pcie_port *pp) > +{ > + kirin_pcie_establish_link(pp); > +} > + > +static struct dw_pcie_ops kirin_dw_pcie_ops = { > + .read_dbi = kirin_pcie_read_dbi, > + .write_dbi = kirin_pcie_write_dbi, > + .link_up = kirin_pcie_link_up, > +}; > + > +static struct dw_pcie_host_ops kirin_pcie_host_ops = { > + .rd_own_conf = kirin_pcie_rd_own_conf, > + .wr_own_conf = kirin_pcie_wr_own_conf, > + .host_init = kirin_pcie_host_init, > +}; > + > +static int __init kirin_add_pcie_port(struct dw_pcie *pci, > + struct platform_device *pdev) > +{ > + pci->pp.ops = &kirin_pcie_host_ops; > + > + return dw_pcie_host_init(&pci->pp); > +} > + > +static int kirin_pcie_probe(struct platform_device *pdev) > +{ > + struct kirin_pcie *kirin_pcie; > + struct dw_pcie *pci; > + struct device *dev = &pdev->dev; > + int ret; > + > + if (!dev->of_node) { > + dev_err(&pdev->dev, "NULL node\n"); > + return -EINVAL; > + } > + > + kirin_pcie = devm_kzalloc(dev, sizeof(struct kirin_pcie), > GFP_KERNEL); > + if (!kirin_pcie) > + return -ENOMEM; > + > + pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); > + if (!pci) > + return -ENOMEM; > + > + pci->dev = dev; > + pci->ops = &kirin_dw_pcie_ops; > + kirin_pcie->pci = pci; > + > + ret = kirin_pcie_get_clk(kirin_pcie, pdev); > + if (ret) > + return ret; > + > + ret = kirin_pcie_get_resource(kirin_pcie, pdev); > + if (ret) > + return ret; > + > + kirin_pcie->gpio_id_reset = of_get_named_gpio(dev->of_node, > + "reset-gpio", 0); > + if (kirin_pcie->gpio_id_reset < 0) > + return -ENODEV; > + > + ret = kirin_pcie_power_on(kirin_pcie); > + if (ret) > + return ret; > + > + platform_set_drvdata(pdev, kirin_pcie); > + > + return kirin_add_pcie_port(pci, pdev); > +} > + > +static const struct of_device_id kirin_pcie_match[] = { > + { .compatible = "hisilicon,kirin960-pcie" }, > + {}, > +}; > + > +struct platform_driver kirin_pcie_driver = { > + .probe = kirin_pcie_probe, > + .driver = { > + .name = "kirin-pcie", > + .of_match_table = kirin_pcie_match, > + .suppress_bind_attrs = true, > + }, > +}; > + > +builtin_platform_driver(kirin_pcie_driver); > -- > 2.11.GIT
diff --git a/drivers/pci/dwc/Kconfig b/drivers/pci/dwc/Kconfig index d2d2ba5b8a68..afecfb2b6ff4 100644 --- a/drivers/pci/dwc/Kconfig +++ b/drivers/pci/dwc/Kconfig @@ -130,4 +130,14 @@ config PCIE_ARTPEC6 Say Y here to enable PCIe controller support on Axis ARTPEC-6 SoCs. This PCIe controller uses the DesignWare core. +config PCIE_KIRIN + depends on OF && ARM64 + bool "HiSilicon Kirin series SoCs PCIe controllers" + depends on PCI + select PCIEPORTBUS + select PCIE_DW_HOST + help + Say Y here if you want PCIe controller support + on HiSilicon Kirin series SoCs. + endmenu diff --git a/drivers/pci/dwc/Makefile b/drivers/pci/dwc/Makefile index a2df13c28798..4bd69bacd4ab 100644 --- a/drivers/pci/dwc/Makefile +++ b/drivers/pci/dwc/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o +obj-$(CONFIG_PCIE_KIRIN) += pcie-kirin.o # The following drivers are for devices that use the generic ACPI # pci_root.c driver but don't support standard ECAM config access. diff --git a/drivers/pci/dwc/pcie-kirin.c b/drivers/pci/dwc/pcie-kirin.c new file mode 100644 index 000000000000..f63e6548efae --- /dev/null +++ b/drivers/pci/dwc/pcie-kirin.c @@ -0,0 +1,514 @@ +/* + * PCIe host controller driver for Kirin Phone SoCs + * + * Copyright (C) 2017 Hilisicon Electronics Co., Ltd. + * http://www.huawei.com + * + * Author: Xiaowei Song <songxiaowei@huawei.com> + * + * 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 <asm/compiler.h> +#include <linux/compiler.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/interrupt.h> +#include <linux/mfd/syscon.h> +#include <linux/of_address.h> +#include <linux/of_gpio.h> +#include <linux/of_pci.h> +#include <linux/pci.h> +#include <linux/pci_regs.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/resource.h> +#include <linux/types.h> +#include "pcie-designware.h" + +#define to_kirin_pcie(x) dev_get_drvdata((x)->dev) + +#define REF_CLK_FREQ 100000000 + +/* PCIe ELBI registers */ +#define SOC_PCIECTRL_CTRL0_ADDR 0x000 +#define SOC_PCIECTRL_CTRL1_ADDR 0x004 +#define SOC_PCIEPHY_CTRL2_ADDR 0x008 +#define SOC_PCIEPHY_CTRL3_ADDR 0x00c +#define PCIE_ELBI_SLV_DBI_ENABLE (0x1 << 21) + +/* info located in APB */ +#define PCIE_APP_LTSSM_ENABLE 0x01c +#define PCIE_APB_PHY_CTRL0 0x0 +#define PCIE_APB_PHY_CTRL1 0x4 +#define PCIE_APB_PHY_STATUS0 0x400 +#define PCIE_LINKUP_ENABLE (0x8020) +#define PCIE_LTSSM_ENABLE_BIT (0x1 << 11) +#define PIPE_CLK_STABLE (0x1 << 19) +#define PIPE_CLK_MAX_TRY_TIMES 10 +#define PHY_REF_PAD_BIT (0x1 << 8) +#define PHY_PWR_DOWN_BIT (0x1 << 22) +#define PHY_RST_ACK_BIT (0x1 << 16) + +/* info located in sysctrl */ +#define SCTRL_PCIE_CMOS_OFFSET 0x60 +#define SCTRL_PCIE_CMOS_BIT 0x10 +#define SCTRL_PCIE_ISO_OFFSET 0x44 +#define SCTRL_PCIE_ISO_BIT 0x30 +#define SCTRL_PCIE_HPCLK_OFFSET 0x190 +#define SCTRL_PCIE_HPCLK_BIT 0x184000 +#define SCTRL_PCIE_OE_OFFSET 0x14a +#define PCIE_DEBOUNCE_PARAM 0xF0F400 +#define PCIE_OE_BYPASS (0x3 << 28) + +/* peri_crg ctrl */ +#define CRGCTRL_PCIE_ASSERT_OFFSET 0x88 +#define CRGCTRL_PCIE_ASSERT_BIT 0x8c000000 + +/* Time for delay */ +#define REF_2_PERST_MIN 20000 +#define REF_2_PERST_MAX 25000 +#define PERST_2_ACCESS_MIN 10000 +#define PERST_2_ACCESS_MAX 12000 +#define LINK_WAIT_MIN 900 +#define LINK_WAIT_MAX 1000 +#define PIPE_CLK_WAIT_MIN 550 +#define PIPE_CLK_WAIT_MAX 600 + +struct kirin_pcie { + struct dw_pcie *pci; + void __iomem *apb_base; + void __iomem *phy_base; + struct regmap *crgctrl; + struct regmap *sysctrl; + struct clk *apb_sys_clk; + struct clk *apb_phy_clk; + struct clk *phy_ref_clk; + struct clk *pcie_aclk; + struct clk *pcie_aux_clk; + int gpio_id_reset; +}; + +/* Registers in PCIeCTRL */ +static inline void kirin_apb_ctrl_writel(struct kirin_pcie *kirin_pcie, + u32 val, u32 reg) +{ + writel(val, kirin_pcie->apb_base + reg); +} + +static inline u32 kirin_apb_ctrl_readl(struct kirin_pcie *kirin_pcie, u32 reg) +{ + return readl(kirin_pcie->apb_base + reg); +} + +/* Registers in PCIePHY */ +static inline void kirin_apb_phy_writel(struct kirin_pcie *kirin_pcie, + u32 val, u32 reg) +{ + writel(val, kirin_pcie->phy_base + reg); +} + +static inline u32 kirin_apb_phy_readl(struct kirin_pcie *kirin_pcie, u32 reg) +{ + return readl(kirin_pcie->phy_base + reg); +} + +static long kirin_pcie_get_clk(struct kirin_pcie *kirin_pcie, + struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + + kirin_pcie->phy_ref_clk = devm_clk_get(dev, "pcie_phy_ref"); + if (IS_ERR(kirin_pcie->phy_ref_clk)) + return PTR_ERR(kirin_pcie->phy_ref_clk); + + kirin_pcie->pcie_aux_clk = devm_clk_get(dev, "pcie_aux"); + if (IS_ERR(kirin_pcie->pcie_aux_clk)) + return PTR_ERR(kirin_pcie->pcie_aux_clk); + + kirin_pcie->apb_phy_clk = devm_clk_get(dev, "pcie_apb_phy"); + if (IS_ERR(kirin_pcie->apb_phy_clk)) + return PTR_ERR(kirin_pcie->apb_phy_clk); + + kirin_pcie->apb_sys_clk = devm_clk_get(dev, "pcie_apb_sys"); + if (IS_ERR(kirin_pcie->apb_sys_clk)) + return PTR_ERR(kirin_pcie->apb_sys_clk); + + kirin_pcie->pcie_aclk = devm_clk_get(dev, "pcie_aclk"); + if (IS_ERR(kirin_pcie->pcie_aclk)) + return PTR_ERR(kirin_pcie->pcie_aclk); + + return 0; +} + +static long kirin_pcie_get_resource(struct kirin_pcie *kirin_pcie, + struct platform_device *pdev) +{ + struct resource *apb; + struct resource *phy; + struct resource *dbi; + struct device *dev = &pdev->dev; + + apb = platform_get_resource_byname(pdev, IORESOURCE_MEM, "apb"); + kirin_pcie->apb_base = devm_ioremap_resource(dev, apb); + if (IS_ERR(kirin_pcie->apb_base)) + return PTR_ERR(kirin_pcie->apb_base); + + phy = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy"); + kirin_pcie->phy_base = devm_ioremap_resource(dev, phy); + if (IS_ERR(kirin_pcie->phy_base)) + return PTR_ERR(kirin_pcie->phy_base); + + dbi = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi"); + kirin_pcie->pci->dbi_base = devm_ioremap_resource(dev, dbi); + if (IS_ERR(kirin_pcie->pci->dbi_base)) + return PTR_ERR(kirin_pcie->pci->dbi_base); + + kirin_pcie->crgctrl = + syscon_regmap_lookup_by_compatible("hisilicon,hi3660-crgctrl"); + if (IS_ERR(kirin_pcie->crgctrl)) + return PTR_ERR(kirin_pcie->crgctrl); + + kirin_pcie->sysctrl = + syscon_regmap_lookup_by_compatible("hisilicon,hi3660-sctrl"); + if (IS_ERR(kirin_pcie->sysctrl)) + return PTR_ERR(kirin_pcie->sysctrl); + + return 0; +} + +static int kirin_pcie_phy_init(struct kirin_pcie *kirin_pcie) +{ + u32 reg_val; + u32 time = PIPE_CLK_MAX_TRY_TIMES; + + reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL1); + reg_val &= ~PHY_REF_PAD_BIT; + kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL1); + + reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL0); + reg_val &= ~PHY_PWR_DOWN_BIT; + kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL0); + udelay(10); + + reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL1); + reg_val &= ~PHY_RST_ACK_BIT; + kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL1); + + usleep_range(PIPE_CLK_WAIT_MIN, PIPE_CLK_WAIT_MAX); + reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_STATUS0); + if (reg_val & PIPE_CLK_STABLE) { + dev_err(kirin_pcie->pci->dev, "PIPE clk is not stable\n"); + return -EINVAL; + } + + return 0; +} + +static void kirin_pcie_oe_enable(struct kirin_pcie *kirin_pcie) +{ + u32 val; + + regmap_read(kirin_pcie->sysctrl, SCTRL_PCIE_OE_OFFSET, &val); + val |= PCIE_DEBOUNCE_PARAM; + val &= ~PCIE_OE_BYPASS; + regmap_write(kirin_pcie->sysctrl, SCTRL_PCIE_OE_OFFSET, val); +} + +static int kirin_pcie_clk_ctrl(struct kirin_pcie *kirin_pcie, bool enable) +{ + int ret = 0; + + if (!enable) + goto close_clk; + + ret = clk_set_rate(kirin_pcie->phy_ref_clk, REF_CLK_FREQ); + if (ret) + return ret; + + ret = clk_prepare_enable(kirin_pcie->phy_ref_clk); + if (ret) + return ret; + + ret = clk_prepare_enable(kirin_pcie->apb_sys_clk); + if (ret) + goto apb_sys_fail; + + ret = clk_prepare_enable(kirin_pcie->apb_phy_clk); + if (ret) + goto apb_phy_fail; + + ret = clk_prepare_enable(kirin_pcie->pcie_aclk); + if (ret) + goto aclk_fail; + + ret = clk_prepare_enable(kirin_pcie->pcie_aux_clk); + if (ret) + goto aux_clk_fail; + + return 0; + +close_clk: + clk_disable_unprepare(kirin_pcie->pcie_aux_clk); +aux_clk_fail: + clk_disable_unprepare(kirin_pcie->pcie_aclk); +aclk_fail: + clk_disable_unprepare(kirin_pcie->apb_phy_clk); +apb_phy_fail: + clk_disable_unprepare(kirin_pcie->apb_sys_clk); +apb_sys_fail: + clk_disable_unprepare(kirin_pcie->phy_ref_clk); + + return ret; +} + +static int kirin_pcie_power_on(struct kirin_pcie *kirin_pcie) +{ + int ret; + + /* Power supply for Host */ + regmap_write(kirin_pcie->sysctrl, + SCTRL_PCIE_CMOS_OFFSET, SCTRL_PCIE_CMOS_BIT); + udelay(100); + kirin_pcie_oe_enable(kirin_pcie); + + ret = kirin_pcie_clk_ctrl(kirin_pcie, true); + if (ret) + return ret; + + /* ISO disable, PCIeCtrl, PHY assert and clk gate clear */ + regmap_write(kirin_pcie->sysctrl, + SCTRL_PCIE_ISO_OFFSET, SCTRL_PCIE_ISO_BIT); + regmap_write(kirin_pcie->crgctrl, + CRGCTRL_PCIE_ASSERT_OFFSET, CRGCTRL_PCIE_ASSERT_BIT); + regmap_write(kirin_pcie->sysctrl, + SCTRL_PCIE_HPCLK_OFFSET, SCTRL_PCIE_HPCLK_BIT); + + ret = kirin_pcie_phy_init(kirin_pcie); + if (ret) + goto close_clk; + + /* perst assert Endpoint */ + if (!gpio_request(kirin_pcie->gpio_id_reset, "pcie_perst")) { + usleep_range(REF_2_PERST_MIN, REF_2_PERST_MAX); + ret = gpio_direction_output(kirin_pcie->gpio_id_reset, 1); + if (ret) + goto close_clk; + usleep_range(PERST_2_ACCESS_MIN, PERST_2_ACCESS_MAX); + + return 0; + } + +close_clk: + kirin_pcie_clk_ctrl(kirin_pcie, false); + return ret; +} + +static void kirin_pcie_sideband_dbi_w_mode(struct kirin_pcie *kirin_pcie, + bool on) +{ + u32 val; + + val = kirin_apb_ctrl_readl(kirin_pcie, SOC_PCIECTRL_CTRL0_ADDR); + if (on) + val = val | PCIE_ELBI_SLV_DBI_ENABLE; + else + val = val & ~PCIE_ELBI_SLV_DBI_ENABLE; + + kirin_apb_ctrl_writel(kirin_pcie, val, SOC_PCIECTRL_CTRL0_ADDR); +} + +static void kirin_pcie_sideband_dbi_r_mode(struct kirin_pcie *kirin_pcie, + bool on) +{ + u32 val; + + val = kirin_apb_ctrl_readl(kirin_pcie, SOC_PCIECTRL_CTRL1_ADDR); + if (on) + val = val | PCIE_ELBI_SLV_DBI_ENABLE; + else + val = val & ~PCIE_ELBI_SLV_DBI_ENABLE; + + kirin_apb_ctrl_writel(kirin_pcie, val, SOC_PCIECTRL_CTRL1_ADDR); +} + +static int kirin_pcie_rd_own_conf(struct pcie_port *pp, + int where, int size, u32 *val) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); + int ret; + + kirin_pcie_sideband_dbi_r_mode(kirin_pcie, true); + ret = dw_pcie_read(pci->dbi_base + where, size, val); + kirin_pcie_sideband_dbi_r_mode(kirin_pcie, false); + + return ret; +} + +static int kirin_pcie_wr_own_conf(struct pcie_port *pp, + int where, int size, u32 val) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); + int ret; + + kirin_pcie_sideband_dbi_w_mode(kirin_pcie, true); + ret = dw_pcie_write(pci->dbi_base + where, size, val); + kirin_pcie_sideband_dbi_w_mode(kirin_pcie, false); + + return ret; +} + +static u32 kirin_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, + u32 reg, size_t size) +{ + struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); + u32 ret; + + kirin_pcie_sideband_dbi_r_mode(kirin_pcie, true); + dw_pcie_read(base + reg, size, &ret); + kirin_pcie_sideband_dbi_r_mode(kirin_pcie, false); + + return ret; +} + +static void kirin_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, + u32 reg, size_t size, u32 val) +{ + struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); + + kirin_pcie_sideband_dbi_w_mode(kirin_pcie, true); + dw_pcie_write(base + reg, size, val); + kirin_pcie_sideband_dbi_w_mode(kirin_pcie, false); +} + +static int kirin_pcie_link_up(struct dw_pcie *pci) +{ + struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); + u32 val = kirin_apb_ctrl_readl(kirin_pcie, PCIE_APB_PHY_STATUS0); + + if ((val & PCIE_LINKUP_ENABLE) == PCIE_LINKUP_ENABLE) + return 1; + + return 0; +} + +static int kirin_pcie_establish_link(struct pcie_port *pp) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); + int count = 0; + + if (kirin_pcie_link_up(pci)) + return 0; + + dw_pcie_setup_rc(pp); + + /* assert LTSSM enable */ + kirin_apb_ctrl_writel(kirin_pcie, PCIE_LTSSM_ENABLE_BIT, + PCIE_APP_LTSSM_ENABLE); + + /* check if the link is up or not */ + while (!kirin_pcie_link_up(pci)) { + usleep_range(LINK_WAIT_MIN, LINK_WAIT_MAX); + count++; + if (count == 1000) { + dev_err(pci->dev, "Link Fail\n"); + return -EINVAL; + } + } + + return 0; +} + +static void kirin_pcie_host_init(struct pcie_port *pp) +{ + kirin_pcie_establish_link(pp); +} + +static struct dw_pcie_ops kirin_dw_pcie_ops = { + .read_dbi = kirin_pcie_read_dbi, + .write_dbi = kirin_pcie_write_dbi, + .link_up = kirin_pcie_link_up, +}; + +static struct dw_pcie_host_ops kirin_pcie_host_ops = { + .rd_own_conf = kirin_pcie_rd_own_conf, + .wr_own_conf = kirin_pcie_wr_own_conf, + .host_init = kirin_pcie_host_init, +}; + +static int __init kirin_add_pcie_port(struct dw_pcie *pci, + struct platform_device *pdev) +{ + pci->pp.ops = &kirin_pcie_host_ops; + + return dw_pcie_host_init(&pci->pp); +} + +static int kirin_pcie_probe(struct platform_device *pdev) +{ + struct kirin_pcie *kirin_pcie; + struct dw_pcie *pci; + struct device *dev = &pdev->dev; + int ret; + + if (!dev->of_node) { + dev_err(&pdev->dev, "NULL node\n"); + return -EINVAL; + } + + kirin_pcie = devm_kzalloc(dev, sizeof(struct kirin_pcie), GFP_KERNEL); + if (!kirin_pcie) + return -ENOMEM; + + pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); + if (!pci) + return -ENOMEM; + + pci->dev = dev; + pci->ops = &kirin_dw_pcie_ops; + kirin_pcie->pci = pci; + + ret = kirin_pcie_get_clk(kirin_pcie, pdev); + if (ret) + return ret; + + ret = kirin_pcie_get_resource(kirin_pcie, pdev); + if (ret) + return ret; + + kirin_pcie->gpio_id_reset = of_get_named_gpio(dev->of_node, + "reset-gpio", 0); + if (kirin_pcie->gpio_id_reset < 0) + return -ENODEV; + + ret = kirin_pcie_power_on(kirin_pcie); + if (ret) + return ret; + + platform_set_drvdata(pdev, kirin_pcie); + + return kirin_add_pcie_port(pci, pdev); +} + +static const struct of_device_id kirin_pcie_match[] = { + { .compatible = "hisilicon,kirin960-pcie" }, + {}, +}; + +struct platform_driver kirin_pcie_driver = { + .probe = kirin_pcie_probe, + .driver = { + .name = "kirin-pcie", + .of_match_table = kirin_pcie_match, + .suppress_bind_attrs = true, + }, +}; + +builtin_platform_driver(kirin_pcie_driver);
Hisilicon PCIe Driver shares the common functions for PCIe dw-host The poweron functions is developed on hi3660 SoC, while Others Functions are common for Kirin series SoCs. Low power mode (L1 sub-state and Suspend/Resume), hotplug and MSI feature are not supported currently. Cc: Guodong Xu <guodong.xu@linaro.org> Signed-off-by: Xiaowei Song <songxiaowei@hisilicon.com> --- drivers/pci/dwc/Kconfig | 10 + drivers/pci/dwc/Makefile | 1 + drivers/pci/dwc/pcie-kirin.c | 514 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 525 insertions(+) create mode 100644 drivers/pci/dwc/pcie-kirin.c