This patch adds PCIe host support for Hisilicon Soc Hip05. Signed-off-by: Zhou Wang <wangzhou1@xxxxxxxxxxxxx> --- drivers/pci/host/Kconfig | 5 + drivers/pci/host/Makefile | 1 + drivers/pci/host/pcie-hisi.c | 257 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 263 insertions(+) create mode 100644 drivers/pci/host/pcie-hisi.c diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig index c132bdd..37f2075 100644 --- a/drivers/pci/host/Kconfig +++ b/drivers/pci/host/Kconfig @@ -145,4 +145,9 @@ config PCIE_IPROC_BCMA Say Y here if you want to use the Broadcom iProc PCIe controller through the BCMA bus interface +config PCI_HISI + depends on OF && ARM64 + bool "Hisilicon Soc HIP05 PCIe controller" + select PCIE_DW + endmenu diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile index 140d66f..ea1dbf2 100644 --- a/drivers/pci/host/Makefile +++ b/drivers/pci/host/Makefile @@ -17,3 +17,4 @@ obj-$(CONFIG_PCI_VERSATILE) += pci-versatile.o obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o obj-$(CONFIG_PCIE_IPROC_PLATFORM) += pcie-iproc-platform.o obj-$(CONFIG_PCIE_IPROC_BCMA) += pcie-iproc-bcma.o +obj-$(CONFIG_PCI_HISI) += pcie-hisi.o diff --git a/drivers/pci/host/pcie-hisi.c b/drivers/pci/host/pcie-hisi.c new file mode 100644 index 0000000..9f2fac1 --- /dev/null +++ b/drivers/pci/host/pcie-hisi.c @@ -0,0 +1,257 @@ +/* + * PCIe host controller driver for Hisilicon Hip05 SoCs + * + * Copyright (C) 2015 Hisilicon Co., Ltd. http://www.hisilicon.com + * + * Author: Zhou Wang <wangzhou1@xxxxxxxxxxxxx> + * Dacai Zhu <zhudacai@xxxxxxxxxxxxx> + * + * 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/interrupt.h> +#include <linux/irqdomain.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_pci.h> +#include <linux/platform_device.h> + +#include "pcie-designware.h" + +#define PCIE_SUBCTRL_MODE_REG 0x2800 +#define PCIE_SUBCTRL_SYS_STATE4_REG 0x6818 +#define PCIE_SLV_DBI_MODE 0x0 +#define PCIE_SLV_SYSCTRL_MODE 0x1 +#define PCIE_SLV_CONTENT_MODE 0x2 +#define PCIE_SLV_MSI_ASID 0x10 +#define PCIE_LTSSM_LINKUP_STATE 0x11 +#define PCIE_LTSSM_STATE_MASK 0x3F +#define PCIE_MSI_ASID_ENABLE (0x1 << 12) +#define PCIE_MSI_ASID_VALUE (0x1 << 16) +#define PCIE_MSI_TRANS_ENABLE (0x1 << 12) +#define PCIE_MSI_TRANS_REG 0x1c8 +#define PCIE_MSI_LOW_ADDRESS 0x1b4 +#define PCIE_MSI_HIGH_ADDRESS 0x1c4 +#define PCIE_MSI_ADDRESS_VAL 0xb7010040 + +#define to_hisi_pcie(x) container_of(x, struct hisi_pcie, pp) + +struct hisi_pcie { + void __iomem *subctrl_base; + void __iomem *reg_base; + struct msi_controller *msi; + u32 port_id; + struct pcie_port pp; +}; + +static inline void hisi_pcie_subctrl_writel(struct hisi_pcie *pcie, + u32 val, u32 reg) +{ + writel(val, pcie->subctrl_base + reg); +} + +static inline u32 hisi_pcie_subctrl_readl(struct hisi_pcie *pcie, u32 reg) +{ + return readl(pcie->subctrl_base + reg); +} + +static inline void hisi_pcie_apb_writel(struct hisi_pcie *pcie, + u32 val, u32 reg) +{ + writel(val, pcie->reg_base + reg); +} + +static inline u32 hisi_pcie_apb_readl(struct hisi_pcie *pcie, u32 reg) +{ + return readl(pcie->reg_base + reg); +} + +/* + * Change mode to indicate the same reg_base to base of PCIe host configure + * registers, base of RC configure space or base of vmid/asid context table + */ +static void hisi_pcie_change_apb_mode(struct hisi_pcie *pcie, u32 mode) +{ + u32 val; + u32 bit_mask; + u32 bit_shift; + u32 port_id = pcie->port_id; + u32 reg = PCIE_SUBCTRL_MODE_REG + 0x100 * port_id; + + if ((port_id == 1) || (port_id == 2)) { + bit_mask = 0xc; + bit_shift = 0x2; + } else { + bit_mask = 0x6; + bit_shift = 0x1; + } + + val = hisi_pcie_subctrl_readl(pcie, reg); + val = (val & (~bit_mask)) | (mode << bit_shift); + hisi_pcie_subctrl_writel(pcie, val, reg); +} + +/* Configure vmid/asid table in PCIe host */ +static void hisi_pcie_config_context(struct hisi_pcie *pcie) +{ + int i; + + hisi_pcie_change_apb_mode(pcie, PCIE_SLV_CONTENT_MODE); + + /* + * init vmid and asid tables for all PCIes device as 0 + * vmid table: 0 ~ 0x3ff, asid table: 0x400 ~ 0x7ff + */ + for (i = 0; i < 0x800; i++) + hisi_pcie_apb_writel(pcie, 0x0, i * 4); + + hisi_pcie_change_apb_mode(pcie, PCIE_SLV_SYSCTRL_MODE); + + hisi_pcie_apb_writel(pcie, PCIE_MSI_ADDRESS_VAL, PCIE_MSI_LOW_ADDRESS); + hisi_pcie_apb_writel(pcie, 0x0, PCIE_MSI_HIGH_ADDRESS); + hisi_pcie_apb_writel(pcie, PCIE_MSI_ASID_ENABLE | PCIE_MSI_ASID_VALUE, + PCIE_SLV_MSI_ASID); + hisi_pcie_apb_writel(pcie, PCIE_MSI_TRANS_ENABLE, PCIE_MSI_TRANS_REG); + + hisi_pcie_change_apb_mode(pcie, PCIE_SLV_DBI_MODE); +} + +static int hisi_pcie_link_up(struct pcie_port *pp) +{ + u32 val; + + struct hisi_pcie *hisi_pcie = to_hisi_pcie(pp); + + val = hisi_pcie_subctrl_readl(hisi_pcie, PCIE_SUBCTRL_SYS_STATE4_REG + + 0x100 * hisi_pcie->port_id); + + return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE); +} + +static +int hisi_pcie_msi_host_init(struct pcie_port *pp, struct msi_controller *chip) +{ + struct device_node *msi_node; + struct irq_domain *irq_domain; + struct device_node *np = pp->dev->of_node; + + msi_node = of_parse_phandle(np, "msi-parent", 0); + if (!msi_node) { + pr_err("failed to find msi-parent\n"); + return -ENODEV; + } + + irq_domain = irq_find_host(msi_node); + if (!irq_domain) { + pr_err("failed to find irq domain\n"); + return -ENODEV; + } + + pp->irq_domain = irq_domain; + + return 0; +} + +static struct pcie_host_ops hisi_pcie_host_ops = { + .link_up = hisi_pcie_link_up, + .msi_host_init = hisi_pcie_msi_host_init, +}; + +static int __init hisi_add_pcie_port(struct pcie_port *pp, + struct platform_device *pdev) +{ + int ret; + u32 port_id; + struct resource busn; + + struct hisi_pcie *hisi_pcie = to_hisi_pcie(pp); + + if (of_property_read_u32(pdev->dev.of_node, "port-id", &port_id)) { + dev_err(&pdev->dev, "failed to read port-id\n"); + return -EINVAL; + } + if (port_id > 3) { + dev_err(&pdev->dev, "Invalid port-id\n"); + return -EINVAL; + } + + hisi_pcie->port_id = port_id; + + if (of_pci_parse_bus_range(pdev->dev.of_node, &busn)) { + dev_err(&pdev->dev, "failed to parse bus-ranges\n"); + return -EINVAL; + } + + pp->root_bus_nr = busn.start; + pp->ops = &hisi_pcie_host_ops; + + hisi_pcie_config_context(hisi_pcie); + + ret = dw_pcie_host_init(pp); + if (ret) { + dev_err(&pdev->dev, "failed to initialize host\n"); + return ret; + } + + return 0; +} + +static int __init hisi_pcie_probe(struct platform_device *pdev) +{ + struct hisi_pcie *hisi_pcie; + struct pcie_port *pp; + struct resource *reg; + struct resource *subctrl; + int ret; + + hisi_pcie = devm_kzalloc(&pdev->dev, sizeof(*hisi_pcie), GFP_KERNEL); + if (!hisi_pcie) + return -ENOMEM; + + pp = &hisi_pcie->pp; + pp->dev = &pdev->dev; + + subctrl = platform_get_resource_byname(pdev, IORESOURCE_MEM, "subctrl"); + hisi_pcie->subctrl_base = devm_ioremap_nocache(&pdev->dev, + subctrl->start, resource_size(subctrl)); + if (IS_ERR(hisi_pcie->subctrl_base)) { + dev_err(pp->dev, "cannot get subctrl base\n"); + return PTR_ERR(hisi_pcie->subctrl_base); + } + + reg = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc_dbi"); + hisi_pcie->reg_base = devm_ioremap_resource(&pdev->dev, reg); + if (IS_ERR(hisi_pcie->reg_base)) { + dev_err(pp->dev, "cannot get reg base\n"); + return PTR_ERR(hisi_pcie->reg_base); + } + + hisi_pcie->pp.dbi_base = hisi_pcie->reg_base; + + ret = hisi_add_pcie_port(pp, pdev); + if (ret < 0) + return ret; + + platform_set_drvdata(pdev, hisi_pcie); + + return ret; +} + +static const struct of_device_id hisi_pcie_of_match[] = { + {.compatible = "hisilicon,hip05-pcie",}, + {}, +}; + +MODULE_DEVICE_TABLE(of, hisi_pcie_of_match); + +static struct platform_driver hisi_pcie_driver = { + .probe = hisi_pcie_probe, + .driver = { + .name = "hisi-pcie", + .owner = THIS_MODULE, + .of_match_table = hisi_pcie_of_match, + }, +}; + +module_platform_driver(hisi_pcie_driver); -- 1.9.1 -- 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
