Broadcom BCM281xx parts have a PHY control block that operates in conjunction with the DWC2 USB OTG. This driver exposes an API that allows control of power/reset for a connected USB PHY. Signed-off-by: Matt Porter <matt.porter@xxxxxxxxxx> Reviewed-by: Markus Mayer <markus.mayer@xxxxxxxxxx> Reviewed-by: Tim Kryger <tim.kryger@xxxxxxxxxx> --- .../devicetree/bindings/usb/bcm-kona-usb-ctrl.txt | 12 ++ drivers/usb/phy/Kconfig | 5 + drivers/usb/phy/Makefile | 1 + drivers/usb/phy/bcm-kona-usb.h | 31 +++++ drivers/usb/phy/phy-bcm-kona-ctrl.c | 151 +++++++++++++++++++++ 5 files changed, 200 insertions(+) create mode 100644 Documentation/devicetree/bindings/usb/bcm-kona-usb-ctrl.txt create mode 100644 drivers/usb/phy/bcm-kona-usb.h create mode 100644 drivers/usb/phy/phy-bcm-kona-ctrl.c diff --git a/Documentation/devicetree/bindings/usb/bcm-kona-usb-ctrl.txt b/Documentation/devicetree/bindings/usb/bcm-kona-usb-ctrl.txt new file mode 100644 index 0000000..98163f6 --- /dev/null +++ b/Documentation/devicetree/bindings/usb/bcm-kona-usb-ctrl.txt @@ -0,0 +1,12 @@ +BROADCOM KONA USB CONTROL + +Required properties: + - compatible: brcm,kona-ctrl-usb + - reg: offset and length of the USB control registers + +Example: + + usbctl: usbctl@3f130000 { + compatible = "brcm,kona-ctrl-usb"; + reg = <0x3f130000 0x28>; + }; diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig index d5589f9..2b7b4f1 100644 --- a/drivers/usb/phy/Kconfig +++ b/drivers/usb/phy/Kconfig @@ -100,6 +100,11 @@ config AM335X_PHY_USB This driver provides PHY support for that phy which part for the AM335x SoC. +config BCM_KONA_CTRL_USB + tristate + help + Enable this to support the Broadcom Kona USB control block + config SAMSUNG_USBPHY tristate help diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile index 2135e85..98c545e 100644 --- a/drivers/usb/phy/Makefile +++ b/drivers/usb/phy/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_NOP_USB_XCEIV) += phy-generic.o obj-$(CONFIG_OMAP_CONTROL_USB) += phy-omap-control.o obj-$(CONFIG_AM335X_CONTROL_USB) += phy-am335x-control.o obj-$(CONFIG_AM335X_PHY_USB) += phy-am335x.o +obj-$(CONFIG_BCM_KONA_CTRL_USB) += phy-bcm-kona-ctrl.o obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o obj-$(CONFIG_OMAP_USB3) += phy-omap-usb3.o obj-$(CONFIG_SAMSUNG_USBPHY) += phy-samsung-usb.o diff --git a/drivers/usb/phy/bcm-kona-usb.h b/drivers/usb/phy/bcm-kona-usb.h new file mode 100644 index 0000000..4563dd6 --- /dev/null +++ b/drivers/usb/phy/bcm-kona-usb.h @@ -0,0 +1,31 @@ +/* + * bcm_kona_usb.h -- Broadcom Kona USB header file + * + * Copyright (C) 2013 Linaro Limited + * Matt Porter <matt.porter@xxxxxxxxxx> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __BCM_KONA_USB_H +#define __BCM_KONA_USB_H + +#include <linux/usb/phy.h> + +struct bcm_kona_usb { + struct usb_phy phy; + struct device *dev; + struct device *ctrl_dev; +}; + +extern struct device *bcm_kona_get_ctrl_dev(void); +extern void bcm_kona_ctrl_usb_phy_power(struct device *, int); + +#endif /* __BCM_KONA_USB_H */ diff --git a/drivers/usb/phy/phy-bcm-kona-ctrl.c b/drivers/usb/phy/phy-bcm-kona-ctrl.c new file mode 100644 index 0000000..d2936b6 --- /dev/null +++ b/drivers/usb/phy/phy-bcm-kona-ctrl.c @@ -0,0 +1,151 @@ +/* + * phy-bcm-kona-ctrl.c - Broadcom Kona USB Control Driver + * + * Based on phy-omap-control.c + * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com + * Copyright (C) 2013 Linaro Limited + * Matt Porter <matt.porter@xxxxxxxxxx> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/clk.h> + +#include "bcm-kona-usb.h" + +#define OTGCTL_OTGSTAT2 (1 << 31) +#define OTGCTL_OTGSTAT1 (1 << 30) +#define OTGCTL_PRST_N_SW (1 << 11) +#define OTGCTL_HRESET_N (1 << 10) +#define OTGCTL_UTMI_LINE_STATE1 (1 << 9) +#define OTGCTL_UTMI_LINE_STATE0 (1 << 8) + +#define P1CTL_SOFT_RESET (1 << 1) +#define P1CTL_NON_DRIVING (1 << 0) + +struct bcm_kona_usb_ctrl_regs { + u32 ctrl; + u32 cfg; + u32 p1ctl; + u32 status; + u32 bc_cfg; + u32 tp_in; + u32 tp_out; + u32 phy_ctrl; + u32 usbreg; + u32 usbproben; +}; + +struct bcm_kona_ctrl_usb { + struct device *dev; + struct bcm_kona_usb_ctrl_regs *regs; +}; + +static struct bcm_kona_ctrl_usb *ctrl_usb; + +/** + * bcm_kona_ctrl_dev - returns the device pointer for this control device + * + * This API should be called to get the device pointer for the Kona USB + * control device. This device pointer should be used when calling the + * exported bcm_kona_ctrl_usb_phy_power() API. + */ +struct device *bcm_kona_get_ctrl_dev(void) +{ + if (!ctrl_usb) + return ERR_PTR(-ENODEV); + + return ctrl_usb->dev; +} +EXPORT_SYMBOL_GPL(bcm_kona_get_ctrl_dev); + +/** + * bcm_kona_ctrl_usb_phy_power - power on/off the phy using control module reg + * @dev: the control module device + * @on: 0 or 1, based on powering on or off the PHY + */ +void bcm_kona_ctrl_usb_phy_power(struct device *dev, int on) +{ + struct bcm_kona_ctrl_usb *ctrl = dev_get_drvdata(dev); + u32 val; + + val = readl(&ctrl->regs->ctrl); + if (on) { + /* Configure and power PHY */ + val &= ~(OTGCTL_OTGSTAT2 | OTGCTL_OTGSTAT1 | + OTGCTL_UTMI_LINE_STATE1 | OTGCTL_UTMI_LINE_STATE0); + val |= OTGCTL_PRST_N_SW | OTGCTL_HRESET_N; + writel(val, &ctrl->regs->ctrl); + + /* Soft reset PHY */ + val = readl(&ctrl->regs->p1ctl); + val &= ~P1CTL_NON_DRIVING; + val |= P1CTL_SOFT_RESET; + writel(val, &ctrl->regs->p1ctl); + writel(val & ~P1CTL_SOFT_RESET, &ctrl->regs->p1ctl); + /* Reset needs to be asserted for 2ms */ + mdelay(2); + writel(val | P1CTL_SOFT_RESET, &ctrl->regs->p1ctl); + } else { + val &= ~(OTGCTL_PRST_N_SW | OTGCTL_HRESET_N); + writel(val, &ctrl->regs->ctrl); + } +} +EXPORT_SYMBOL_GPL(bcm_kona_ctrl_usb_phy_power); + +static int bcm_kona_ctrl_usb_probe(struct platform_device *pdev) +{ + struct resource *res; + + ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL); + if (!ctrl_usb) { + dev_err(&pdev->dev, "unable to alloc memory for control usb\n"); + return -ENOMEM; + } + + ctrl_usb->dev = &pdev->dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + ctrl_usb->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(ctrl_usb->regs)) + return PTR_ERR(ctrl_usb->regs); + + dev_set_drvdata(ctrl_usb->dev, ctrl_usb); + + return 0; +} + +static const struct of_device_id bcm_kona_ctrl_usb_id_table[] = { + { .compatible = "brcm,kona-ctrl-usb" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, bcm_kona_ctrl_usb_id_table); + +static struct platform_driver bcm_kona_ctrl_usb_driver = { + .probe = bcm_kona_ctrl_usb_probe, + .driver = { + .name = "bcm-kona-ctrl-usb", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(bcm_kona_ctrl_usb_id_table), + }, +}; + +module_platform_driver(bcm_kona_ctrl_usb_driver); + +MODULE_ALIAS("platform:bcm-kona-ctrl-usb"); +MODULE_AUTHOR("Matt Porter"); +MODULE_DESCRIPTION("Broadcom Kona USB Control Driver"); +MODULE_LICENSE("GPL v2"); -- 1.8.4 -- 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