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