2022-10-23 22:47:07 +08:00
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Central probing code for the FOTG210 dual role driver
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* We register one driver for the hardware and then we decide
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* whether to proceed with probing the host or the peripheral
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* driver.
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*/
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2022-11-10 04:05:54 +08:00
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#include <linux/bitops.h>
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2023-01-18 15:09:18 +08:00
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#include <linux/clk.h>
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2022-10-23 22:47:07 +08:00
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#include <linux/device.h>
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2022-11-10 04:05:54 +08:00
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#include <linux/mfd/syscon.h>
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2022-10-23 22:47:07 +08:00
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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2022-11-10 04:05:54 +08:00
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#include <linux/regmap.h>
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2022-10-23 22:47:07 +08:00
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#include <linux/usb.h>
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#include <linux/usb/otg.h>
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2022-10-23 22:47:07 +08:00
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#include "fotg210.h"
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2023-01-18 15:09:19 +08:00
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/* Role Register 0x80 */
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#define FOTG210_RR 0x80
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#define FOTG210_RR_ID BIT(21) /* 1 = B-device, 0 = A-device */
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#define FOTG210_RR_CROLE BIT(20) /* 1 = device, 0 = host */
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2022-11-10 04:05:54 +08:00
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/*
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* Gemini-specific initialization function, only executed on the
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* Gemini SoC using the global misc control register.
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*
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* The gemini USB blocks are connected to either Mini-A (host mode) or
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* Mini-B (peripheral mode) plugs. There is no role switch support on the
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* Gemini SoC, just either-or.
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*/
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#define GEMINI_GLOBAL_MISC_CTRL 0x30
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#define GEMINI_MISC_USB0_WAKEUP BIT(14)
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#define GEMINI_MISC_USB1_WAKEUP BIT(15)
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#define GEMINI_MISC_USB0_VBUS_ON BIT(22)
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#define GEMINI_MISC_USB1_VBUS_ON BIT(23)
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#define GEMINI_MISC_USB0_MINI_B BIT(29)
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#define GEMINI_MISC_USB1_MINI_B BIT(30)
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2023-01-18 15:09:17 +08:00
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static int fotg210_gemini_init(struct fotg210 *fotg, struct resource *res,
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enum usb_dr_mode mode)
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{
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struct device *dev = fotg->dev;
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2022-11-10 04:05:54 +08:00
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struct device_node *np = dev->of_node;
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struct regmap *map;
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bool wakeup;
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u32 mask, val;
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int ret;
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map = syscon_regmap_lookup_by_phandle(np, "syscon");
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2023-01-20 23:44:36 +08:00
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if (IS_ERR(map))
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return dev_err_probe(dev, PTR_ERR(map), "no syscon\n");
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fotg->map = map;
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wakeup = of_property_read_bool(np, "wakeup-source");
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/*
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* Figure out if this is USB0 or USB1 by simply checking the
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* physical base address.
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*/
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mask = 0;
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if (res->start == 0x69000000) {
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fotg->port = GEMINI_PORT_1;
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mask = GEMINI_MISC_USB1_VBUS_ON | GEMINI_MISC_USB1_MINI_B |
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GEMINI_MISC_USB1_WAKEUP;
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if (mode == USB_DR_MODE_HOST)
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val = GEMINI_MISC_USB1_VBUS_ON;
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else
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val = GEMINI_MISC_USB1_MINI_B;
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if (wakeup)
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val |= GEMINI_MISC_USB1_WAKEUP;
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} else {
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fotg->port = GEMINI_PORT_0;
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mask = GEMINI_MISC_USB0_VBUS_ON | GEMINI_MISC_USB0_MINI_B |
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GEMINI_MISC_USB0_WAKEUP;
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if (mode == USB_DR_MODE_HOST)
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val = GEMINI_MISC_USB0_VBUS_ON;
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else
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val = GEMINI_MISC_USB0_MINI_B;
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if (wakeup)
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val |= GEMINI_MISC_USB0_WAKEUP;
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}
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ret = regmap_update_bits(map, GEMINI_GLOBAL_MISC_CTRL, mask, val);
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if (ret) {
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dev_err(dev, "failed to initialize Gemini PHY\n");
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return ret;
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}
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dev_info(dev, "initialized Gemini PHY in %s mode\n",
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(mode == USB_DR_MODE_HOST) ? "host" : "gadget");
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return 0;
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}
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2023-01-18 15:09:21 +08:00
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/**
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* fotg210_vbus() - Called by gadget driver to enable/disable VBUS
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* @enable: true to enable VBUS, false to disable VBUS
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*/
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void fotg210_vbus(struct fotg210 *fotg, bool enable)
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{
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u32 mask;
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u32 val;
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int ret;
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switch (fotg->port) {
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case GEMINI_PORT_0:
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mask = GEMINI_MISC_USB0_VBUS_ON;
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val = enable ? GEMINI_MISC_USB0_VBUS_ON : 0;
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break;
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case GEMINI_PORT_1:
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mask = GEMINI_MISC_USB1_VBUS_ON;
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val = enable ? GEMINI_MISC_USB1_VBUS_ON : 0;
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break;
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default:
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return;
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}
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ret = regmap_update_bits(fotg->map, GEMINI_GLOBAL_MISC_CTRL, mask, val);
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if (ret)
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dev_err(fotg->dev, "failed to %s VBUS\n",
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enable ? "enable" : "disable");
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dev_info(fotg->dev, "%s: %s VBUS\n", __func__, enable ? "enable" : "disable");
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}
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2022-10-23 22:47:07 +08:00
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static int fotg210_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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enum usb_dr_mode mode;
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struct fotg210 *fotg;
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u32 val;
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int ret;
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2023-01-18 15:09:17 +08:00
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fotg = devm_kzalloc(dev, sizeof(*fotg), GFP_KERNEL);
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if (!fotg)
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return -ENOMEM;
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fotg->dev = dev;
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2023-01-20 23:44:37 +08:00
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fotg->base = devm_platform_get_and_ioremap_resource(pdev, 0, &fotg->res);
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2023-01-30 20:06:33 +08:00
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if (IS_ERR(fotg->base))
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return PTR_ERR(fotg->base);
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2023-01-18 15:09:17 +08:00
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2023-01-18 15:09:18 +08:00
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fotg->pclk = devm_clk_get_optional_enabled(dev, "PCLK");
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if (IS_ERR(fotg->pclk))
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return PTR_ERR(fotg->pclk);
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2022-10-23 22:47:08 +08:00
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mode = usb_get_dr_mode(dev);
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2022-11-10 04:05:54 +08:00
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if (of_device_is_compatible(dev->of_node, "cortina,gemini-usb")) {
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ret = fotg210_gemini_init(fotg, fotg->res, mode);
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if (ret)
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return ret;
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}
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2023-01-18 15:09:19 +08:00
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val = readl(fotg->base + FOTG210_RR);
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if (mode == USB_DR_MODE_PERIPHERAL) {
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if (!(val & FOTG210_RR_CROLE))
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dev_err(dev, "block not in device role\n");
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ret = fotg210_udc_probe(pdev, fotg);
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} else {
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if (val & FOTG210_RR_CROLE)
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dev_err(dev, "block not in host role\n");
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ret = fotg210_hcd_probe(pdev, fotg);
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}
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return ret;
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}
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2023-05-18 07:01:25 +08:00
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static void fotg210_remove(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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enum usb_dr_mode mode;
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mode = usb_get_dr_mode(dev);
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if (mode == USB_DR_MODE_PERIPHERAL)
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fotg210_udc_remove(pdev);
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else
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fotg210_hcd_remove(pdev);
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2022-10-23 22:47:07 +08:00
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}
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#ifdef CONFIG_OF
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static const struct of_device_id fotg210_of_match[] = {
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{ .compatible = "faraday,fotg200" },
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{ .compatible = "faraday,fotg210" },
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/* TODO: can we also handle FUSB220? */
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{},
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};
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MODULE_DEVICE_TABLE(of, fotg210_of_match);
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#endif
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static struct platform_driver fotg210_driver = {
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.driver = {
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.name = "fotg210",
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.of_match_table = of_match_ptr(fotg210_of_match),
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},
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.probe = fotg210_probe,
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.remove_new = fotg210_remove,
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};
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static int __init fotg210_init(void)
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{
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2022-12-16 00:57:20 +08:00
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if (IS_ENABLED(CONFIG_USB_FOTG210_HCD) && !usb_disabled())
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fotg210_hcd_init();
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return platform_driver_register(&fotg210_driver);
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}
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module_init(fotg210_init);
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static void __exit fotg210_cleanup(void)
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{
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platform_driver_unregister(&fotg210_driver);
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if (IS_ENABLED(CONFIG_USB_FOTG210_HCD))
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fotg210_hcd_cleanup();
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}
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module_exit(fotg210_cleanup);
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MODULE_AUTHOR("Yuan-Hsin Chen, Feng-Hsin Chiang");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("FOTG210 Dual Role Controller Driver");
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