From: Jianguo Sun <sunjianguo1@xxxxxxxxxx> This commit adds support for HiSilicon STB xHCI host controller. Signed-off-by: Jianguo Sun <sunjianguo1@xxxxxxxxxx> --- drivers/usb/host/Kconfig | 7 + drivers/usb/host/Makefile | 1 + drivers/usb/host/xhci-histb.c | 409 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 417 insertions(+) create mode 100644 drivers/usb/host/xhci-histb.c diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig index 5d958da..c813fc4 100644 --- a/drivers/usb/host/Kconfig +++ b/drivers/usb/host/Kconfig @@ -52,6 +52,13 @@ config USB_XHCI_PLATFORM If unsure, say N. +config USB_XHCI_HISTB + tristate "xHCI support for HiSilicon STB SoCs" + depends on USB_XHCI_PLATFORM && (ARCH_HISI || COMPILE_TEST) + help + Say 'Y' to enable the support for the xHCI host controller + found in HiSilicon STB SoCs. + config USB_XHCI_MTK tristate "xHCI support for MediaTek SoCs" select MFD_SYSCON diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile index 8a8cffe..9b669c9 100644 --- a/drivers/usb/host/Makefile +++ b/drivers/usb/host/Makefile @@ -74,6 +74,7 @@ obj-$(CONFIG_USB_FHCI_HCD) += fhci.o obj-$(CONFIG_USB_XHCI_HCD) += xhci-hcd.o obj-$(CONFIG_USB_XHCI_PCI) += xhci-pci.o obj-$(CONFIG_USB_XHCI_PLATFORM) += xhci-plat-hcd.o +obj-$(CONFIG_USB_XHCI_HISTB) += xhci-histb.o obj-$(CONFIG_USB_XHCI_MTK) += xhci-mtk.o obj-$(CONFIG_USB_XHCI_TEGRA) += xhci-tegra.o obj-$(CONFIG_USB_SL811_HCD) += sl811-hcd.o diff --git a/drivers/usb/host/xhci-histb.c b/drivers/usb/host/xhci-histb.c new file mode 100644 index 0000000..5ec549f --- /dev/null +++ b/drivers/usb/host/xhci-histb.c @@ -0,0 +1,409 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * xHCI host controller driver for HiSilicon STB SoCs + * + * Copyright (C) 2017-2018 HiSilicon Co., Ltd. http://www.hisilicon.com + * + * Authors: Jianguo Sun <sunjianguo1@xxxxxxxxxx> + * + * 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/dma-mapping.h> +#include <linux/kernel.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/regmap.h> +#include <linux/reset.h> + +#include "xhci.h" + +#define GTXTHRCFG 0xc108 +#define GRXTHRCFG 0xc10c +#define REG_GUSB2PHYCFG0 0xc200 +#define BIT_UTMI_8_16 BIT(3) +#define BIT_UTMI_ULPI BIT(4) +#define BIT_FREECLK_EXIST BIT(30) + +#define REG_GUSB3PIPECTL0 0xc2c0 +#define USB3_DEEMPHASIS_MASK GENMASK(2, 1) +#define USB3_DEEMPHASIS0 BIT(1) +#define USB3_TX_MARGIN1 BIT(4) + +struct xhci_hcd_histb { + struct device *dev; + struct usb_hcd *hcd; + void __iomem *ctrl; + struct clk *bus_clk; + struct clk *utmi_clk; + struct clk *pipe_clk; + struct clk *suspend_clk; + struct reset_control *soft_reset; +}; + +static inline struct xhci_hcd_histb *hcd_to_histb(struct usb_hcd *hcd) +{ + return dev_get_drvdata(hcd->self.controller); +} + +static int xhci_histb_config(struct xhci_hcd_histb *histb) +{ + struct device_node *np = histb->dev->of_node; + u32 regval; + + if (of_property_match_string(np, "phys-names", "inno") >= 0) { + /* USB2 PHY chose ulpi 8bit interface */ + regval = readl(histb->ctrl + REG_GUSB2PHYCFG0); + regval &= ~BIT_UTMI_ULPI; + regval &= ~(BIT_UTMI_8_16); + regval &= ~BIT_FREECLK_EXIST; + writel(regval, histb->ctrl + REG_GUSB2PHYCFG0); + } + + if (of_property_match_string(np, "phys-names", "combo") >= 0) { + /* + * write 0x010c0012 to GUSB3PIPECTL0 + * GUSB3PIPECTL0[5:3] = 010 : Tx Margin = 900mV , + * decrease TX voltage + * GUSB3PIPECTL0[2:1] = 01 : Tx Deemphasis = -3.5dB, + * refer to xHCI spec + */ + regval = readl(histb->ctrl + REG_GUSB3PIPECTL0); + regval &= ~USB3_DEEMPHASIS_MASK; + regval |= USB3_DEEMPHASIS0; + regval |= USB3_TX_MARGIN1; + writel(regval, histb->ctrl + REG_GUSB3PIPECTL0); + } + + writel(0x23100000, histb->ctrl + GTXTHRCFG); + writel(0x23100000, histb->ctrl + GRXTHRCFG); + + return 0; +} + +static int xhci_histb_clks_get(struct xhci_hcd_histb *histb) +{ + struct device *dev = histb->dev; + + histb->bus_clk = devm_clk_get(dev, "bus"); + if (IS_ERR(histb->bus_clk)) { + dev_err(dev, "fail to get bus clk\n"); + return PTR_ERR(histb->bus_clk); + } + + histb->utmi_clk = devm_clk_get(dev, "utmi"); + if (IS_ERR(histb->utmi_clk)) { + dev_err(dev, "fail to get utmi clk\n"); + return PTR_ERR(histb->utmi_clk); + } + + histb->pipe_clk = devm_clk_get(dev, "pipe"); + if (IS_ERR(histb->pipe_clk)) { + dev_err(dev, "fail to get pipe clk\n"); + return PTR_ERR(histb->pipe_clk); + } + + histb->suspend_clk = devm_clk_get(dev, "suspend"); + if (IS_ERR(histb->suspend_clk)) { + dev_err(dev, "fail to get suspend clk\n"); + return PTR_ERR(histb->suspend_clk); + } + + return 0; +} + +static int xhci_histb_host_enable(struct xhci_hcd_histb *histb) +{ + int ret; + + ret = clk_prepare_enable(histb->bus_clk); + if (ret) { + dev_err(histb->dev, "failed to enable bus clk\n"); + return ret; + } + + ret = clk_prepare_enable(histb->utmi_clk); + if (ret) { + dev_err(histb->dev, "failed to enable utmi clk\n"); + goto err_utmi_clk; + } + + ret = clk_prepare_enable(histb->pipe_clk); + if (ret) { + dev_err(histb->dev, "failed to enable pipe clk\n"); + goto err_pipe_clk; + } + + ret = clk_prepare_enable(histb->suspend_clk); + if (ret) { + dev_err(histb->dev, "failed to enable suspend clk\n"); + goto err_suspend_clk; + } + + reset_control_deassert(histb->soft_reset); + + return 0; + +err_suspend_clk: + clk_disable_unprepare(histb->pipe_clk); +err_pipe_clk: + clk_disable_unprepare(histb->utmi_clk); +err_utmi_clk: + clk_disable_unprepare(histb->bus_clk); + + return ret; +} + +static void xhci_histb_host_disable(struct xhci_hcd_histb *histb) +{ + reset_control_assert(histb->soft_reset); + + clk_disable_unprepare(histb->suspend_clk); + clk_disable_unprepare(histb->pipe_clk); + clk_disable_unprepare(histb->utmi_clk); + clk_disable_unprepare(histb->bus_clk); +} + +static void xhci_histb_quirks(struct device *dev, struct xhci_hcd *xhci) +{ + /* + * As of now platform drivers don't provide MSI support so we ensure + * here that the generic code does not try to make a pci_dev from our + * dev struct in order to setup MSI + */ + xhci->quirks |= XHCI_PLAT; +} + +/* called during probe() after chip reset completes */ +static int xhci_histb_setup(struct usb_hcd *hcd) +{ + struct xhci_hcd_histb *histb = hcd_to_histb(hcd); + int ret; + + if (usb_hcd_is_primary_hcd(hcd)) { + ret = xhci_histb_config(histb); + if (ret) + return ret; + } + + ret = xhci_gen_setup(hcd, xhci_histb_quirks); + if (ret) + return ret; + + return ret; +} + +static const struct xhci_driver_overrides xhci_histb_overrides __initconst = { + .reset = xhci_histb_setup, +}; + +static struct hc_driver __read_mostly xhci_histb_hc_driver; +static int xhci_histb_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct xhci_hcd_histb *histb; + const struct hc_driver *driver; + struct usb_hcd *hcd; + struct xhci_hcd *xhci; + struct resource *res; + int irq; + int ret = -ENODEV; + + if (usb_disabled()) + return -ENODEV; + + driver = &xhci_histb_hc_driver; + histb = devm_kzalloc(dev, sizeof(*histb), GFP_KERNEL); + if (!histb) + return -ENOMEM; + + histb->dev = dev; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + histb->ctrl = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(histb->ctrl)) + return PTR_ERR(histb->ctrl); + + ret = xhci_histb_clks_get(histb); + if (ret) + return ret; + + histb->soft_reset = devm_reset_control_get(dev, "soft"); + if (IS_ERR(histb->soft_reset)) { + dev_err(dev, "failed to get soft reset\n"); + return PTR_ERR(histb->soft_reset); + } + + pm_runtime_enable(dev); + pm_runtime_get_sync(dev); + device_enable_async_suspend(dev); + + /* Initialize dma_mask and coherent_dma_mask to 32-bits */ + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + hcd = usb_create_hcd(driver, dev, dev_name(dev)); + if (!hcd) { + ret = -ENOMEM; + goto disable_pm; + } + + hcd->regs = histb->ctrl; + hcd->rsrc_start = res->start; + hcd->rsrc_len = resource_size(res); + + histb->hcd = hcd; + dev_set_drvdata(hcd->self.controller, histb); + + ret = xhci_histb_host_enable(histb); + if (ret) + goto put_hcd; + + xhci = hcd_to_xhci(hcd); + + device_wakeup_enable(hcd->self.controller); + + xhci->main_hcd = hcd; + xhci->shared_hcd = usb_create_shared_hcd(driver, dev, dev_name(dev), + hcd); + if (!xhci->shared_hcd) { + ret = -ENOMEM; + goto disable_host; + } + + ret = usb_add_hcd(hcd, irq, IRQF_SHARED); + if (ret) + goto put_usb3_hcd; + + if (HCC_MAX_PSA(xhci->hcc_params) >= 4) + xhci->shared_hcd->can_do_streams = 1; + + ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED); + if (ret) + goto dealloc_usb2_hcd; + + device_enable_async_suspend(dev); + pm_runtime_put_noidle(dev); + + /* + * Prevent runtime pm from being on as default, users should enable + * runtime pm using power/control in sysfs. + */ + pm_runtime_forbid(dev); + + return 0; + +dealloc_usb2_hcd: + usb_remove_hcd(hcd); +put_usb3_hcd: + usb_put_hcd(xhci->shared_hcd); +disable_host: + xhci_histb_host_disable(histb); +put_hcd: + usb_put_hcd(hcd); +disable_pm: + pm_runtime_put_sync(dev); + pm_runtime_disable(dev); + + return ret; +} + +static int xhci_histb_remove(struct platform_device *dev) +{ + struct xhci_hcd_histb *histb = platform_get_drvdata(dev); + struct usb_hcd *hcd = histb->hcd; + struct xhci_hcd *xhci = hcd_to_xhci(hcd); + + xhci->xhc_state |= XHCI_STATE_REMOVING; + + usb_remove_hcd(xhci->shared_hcd); + device_wakeup_disable(&dev->dev); + + usb_remove_hcd(hcd); + usb_put_hcd(xhci->shared_hcd); + + xhci_histb_host_disable(histb); + usb_put_hcd(hcd); + pm_runtime_put_sync(&dev->dev); + pm_runtime_disable(&dev->dev); + + return 0; +} + +static int __maybe_unused xhci_histb_suspend(struct device *dev) +{ + struct xhci_hcd_histb *histb = dev_get_drvdata(dev); + struct usb_hcd *hcd = histb->hcd; + struct xhci_hcd *xhci = hcd_to_xhci(hcd); + int ret; + + ret = xhci_suspend(xhci, device_may_wakeup(dev)); + + if (!device_may_wakeup(dev)) + xhci_histb_host_disable(histb); + + return ret; +} + +static int __maybe_unused xhci_histb_resume(struct device *dev) +{ + struct xhci_hcd_histb *histb = dev_get_drvdata(dev); + struct usb_hcd *hcd = histb->hcd; + struct xhci_hcd *xhci = hcd_to_xhci(hcd); + + if (!device_may_wakeup(dev)) + xhci_histb_host_enable(histb); + + return xhci_resume(xhci, 0); +} + +static const struct dev_pm_ops xhci_histb_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(xhci_histb_suspend, xhci_histb_resume) +}; +#define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &xhci_histb_pm_ops : NULL) + +#ifdef CONFIG_OF +static const struct of_device_id histb_xhci_of_match[] = { + { .compatible = "hisilicon,hi3798cv200-xhci"}, + { }, +}; +MODULE_DEVICE_TABLE(of, histb_xhci_of_match); +#endif + +static struct platform_driver histb_xhci_driver = { + .probe = xhci_histb_probe, + .remove = xhci_histb_remove, + .driver = { + .name = "xhci-histb", + .pm = DEV_PM_OPS, + .of_match_table = of_match_ptr(histb_xhci_of_match), + }, +}; +MODULE_ALIAS("platform:xhci-histb"); + +static int __init xhci_histb_init(void) +{ + xhci_init_driver(&xhci_histb_hc_driver, &xhci_histb_overrides); + return platform_driver_register(&histb_xhci_driver); +} +module_init(xhci_histb_init); + +static void __exit xhci_histb_exit(void) +{ + platform_driver_unregister(&histb_xhci_driver); +} +module_exit(xhci_histb_exit); + +MODULE_DESCRIPTION("HiSilicon STB xHCI Host Controller Driver"); +MODULE_LICENSE("GPL v2"); -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
