2 * Copyright (C) 2016 MediaTek Inc.
4 * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
17 #include <linux/clk.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/iopoll.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/of_address.h>
23 #include <linux/of_irq.h>
24 #include <linux/pinctrl/consumer.h>
25 #include <linux/platform_device.h>
30 /* u2-port0 should be powered on and enabled; */
31 int ssusb_check_clocks(struct ssusb_mtk *ssusb, u32 ex_clks)
33 void __iomem *ibase = ssusb->ippc_base;
37 check_val = ex_clks | SSUSB_SYS125_RST_B_STS | SSUSB_SYSPLL_STABLE |
40 ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS1, value,
41 (check_val == (value & check_val)), 100, 20000);
43 dev_err(ssusb->dev, "clks of sts1 are not stable!\n");
47 ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS2, value,
48 (value & SSUSB_U2_MAC_SYS_RST_B_STS), 100, 10000);
50 dev_err(ssusb->dev, "mac2 clock is not stable\n");
57 static int ssusb_phy_init(struct ssusb_mtk *ssusb)
62 for (i = 0; i < ssusb->num_phys; i++) {
63 ret = phy_init(ssusb->phys[i]);
71 phy_exit(ssusb->phys[i - 1]);
76 static int ssusb_phy_exit(struct ssusb_mtk *ssusb)
80 for (i = 0; i < ssusb->num_phys; i++)
81 phy_exit(ssusb->phys[i]);
86 static int ssusb_phy_power_on(struct ssusb_mtk *ssusb)
91 for (i = 0; i < ssusb->num_phys; i++) {
92 ret = phy_power_on(ssusb->phys[i]);
100 phy_power_off(ssusb->phys[i - 1]);
105 static void ssusb_phy_power_off(struct ssusb_mtk *ssusb)
109 for (i = 0; i < ssusb->num_phys; i++)
110 phy_power_off(ssusb->phys[i]);
113 static int ssusb_rscs_init(struct ssusb_mtk *ssusb)
117 ret = regulator_enable(ssusb->vusb33);
119 dev_err(ssusb->dev, "failed to enable vusb33\n");
123 ret = clk_prepare_enable(ssusb->sys_clk);
125 dev_err(ssusb->dev, "failed to enable sys_clk\n");
129 ret = ssusb_phy_init(ssusb);
131 dev_err(ssusb->dev, "failed to init phy\n");
135 ret = ssusb_phy_power_on(ssusb);
137 dev_err(ssusb->dev, "failed to power on phy\n");
144 ssusb_phy_exit(ssusb);
146 clk_disable_unprepare(ssusb->sys_clk);
148 regulator_disable(ssusb->vusb33);
154 static void ssusb_rscs_exit(struct ssusb_mtk *ssusb)
156 clk_disable_unprepare(ssusb->sys_clk);
157 regulator_disable(ssusb->vusb33);
158 ssusb_phy_power_off(ssusb);
159 ssusb_phy_exit(ssusb);
162 static void ssusb_ip_sw_reset(struct ssusb_mtk *ssusb)
164 /* reset whole ip (xhci & u3d) */
165 mtu3_setbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
167 mtu3_clrbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
170 static int get_iddig_pinctrl(struct ssusb_mtk *ssusb)
172 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
174 otg_sx->id_pinctrl = devm_pinctrl_get(ssusb->dev);
175 if (IS_ERR(otg_sx->id_pinctrl)) {
176 dev_err(ssusb->dev, "Cannot find id pinctrl!\n");
177 return PTR_ERR(otg_sx->id_pinctrl);
181 pinctrl_lookup_state(otg_sx->id_pinctrl, "id_float");
182 if (IS_ERR(otg_sx->id_float)) {
183 dev_err(ssusb->dev, "Cannot find pinctrl id_float!\n");
184 return PTR_ERR(otg_sx->id_float);
188 pinctrl_lookup_state(otg_sx->id_pinctrl, "id_ground");
189 if (IS_ERR(otg_sx->id_ground)) {
190 dev_err(ssusb->dev, "Cannot find pinctrl id_ground!\n");
191 return PTR_ERR(otg_sx->id_ground);
197 static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
199 struct device_node *node = pdev->dev.of_node;
200 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
201 struct device *dev = &pdev->dev;
202 struct regulator *vbus;
203 struct resource *res;
207 ssusb->num_phys = of_count_phandle_with_args(node,
208 "phys", "#phy-cells");
209 if (ssusb->num_phys > 0) {
210 ssusb->phys = devm_kcalloc(dev, ssusb->num_phys,
211 sizeof(*ssusb->phys), GFP_KERNEL);
218 for (i = 0; i < ssusb->num_phys; i++) {
219 ssusb->phys[i] = devm_of_phy_get_by_index(dev, node, i);
220 if (IS_ERR(ssusb->phys[i])) {
221 dev_err(dev, "failed to get phy-%d\n", i);
222 return PTR_ERR(ssusb->phys[i]);
226 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ippc");
227 ssusb->ippc_base = devm_ioremap_resource(dev, res);
228 if (IS_ERR(ssusb->ippc_base)) {
229 dev_err(dev, "failed to map memory for ippc\n");
230 return PTR_ERR(ssusb->ippc_base);
233 ssusb->vusb33 = devm_regulator_get(&pdev->dev, "vusb33");
234 if (IS_ERR(ssusb->vusb33)) {
235 dev_err(dev, "failed to get vusb33\n");
236 return PTR_ERR(ssusb->vusb33);
239 ssusb->sys_clk = devm_clk_get(dev, "sys_ck");
240 if (IS_ERR(ssusb->sys_clk)) {
241 dev_err(dev, "failed to get sys clock\n");
242 return PTR_ERR(ssusb->sys_clk);
245 ssusb->dr_mode = usb_get_dr_mode(dev);
246 if (ssusb->dr_mode == USB_DR_MODE_UNKNOWN) {
247 dev_err(dev, "dr_mode is error\n");
251 if (ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
254 /* if host role is supported */
255 ret = ssusb_wakeup_of_property_parse(ssusb, node);
259 if (ssusb->dr_mode != USB_DR_MODE_OTG)
262 /* if dual-role mode is supported */
263 vbus = devm_regulator_get(&pdev->dev, "vbus");
265 dev_err(dev, "failed to get vbus\n");
266 return PTR_ERR(vbus);
270 otg_sx->is_u3_drd = of_property_read_bool(node, "mediatek,usb3-drd");
271 otg_sx->manual_drd_enabled =
272 of_property_read_bool(node, "enable-manual-drd");
274 if (of_property_read_bool(node, "extcon")) {
275 otg_sx->edev = extcon_get_edev_by_phandle(ssusb->dev, 0);
276 if (IS_ERR(otg_sx->edev)) {
277 dev_err(ssusb->dev, "couldn't get extcon device\n");
278 return -EPROBE_DEFER;
280 if (otg_sx->manual_drd_enabled) {
281 ret = get_iddig_pinctrl(ssusb);
287 dev_info(dev, "dr_mode: %d, is_u3_dr: %d\n",
288 ssusb->dr_mode, otg_sx->is_u3_drd);
293 static int mtu3_probe(struct platform_device *pdev)
295 struct device_node *node = pdev->dev.of_node;
296 struct device *dev = &pdev->dev;
297 struct ssusb_mtk *ssusb;
300 /* all elements are set to ZERO as default value */
301 ssusb = devm_kzalloc(dev, sizeof(*ssusb), GFP_KERNEL);
305 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
307 dev_err(dev, "No suitable DMA config available\n");
311 platform_set_drvdata(pdev, ssusb);
314 ret = get_ssusb_rscs(pdev, ssusb);
318 /* enable power domain */
319 pm_runtime_enable(dev);
320 pm_runtime_get_sync(dev);
321 device_enable_async_suspend(dev);
323 ret = ssusb_rscs_init(ssusb);
327 ssusb_ip_sw_reset(ssusb);
329 if (IS_ENABLED(CONFIG_USB_MTU3_HOST))
330 ssusb->dr_mode = USB_DR_MODE_HOST;
331 else if (IS_ENABLED(CONFIG_USB_MTU3_GADGET))
332 ssusb->dr_mode = USB_DR_MODE_PERIPHERAL;
334 /* default as host */
335 ssusb->is_host = !(ssusb->dr_mode == USB_DR_MODE_PERIPHERAL);
337 switch (ssusb->dr_mode) {
338 case USB_DR_MODE_PERIPHERAL:
339 ret = ssusb_gadget_init(ssusb);
341 dev_err(dev, "failed to initialize gadget\n");
345 case USB_DR_MODE_HOST:
346 ret = ssusb_host_init(ssusb, node);
348 dev_err(dev, "failed to initialize host\n");
352 case USB_DR_MODE_OTG:
353 ret = ssusb_gadget_init(ssusb);
355 dev_err(dev, "failed to initialize gadget\n");
359 ret = ssusb_host_init(ssusb, node);
361 dev_err(dev, "failed to initialize host\n");
365 ssusb_otg_switch_init(ssusb);
368 dev_err(dev, "unsupported mode: %d\n", ssusb->dr_mode);
376 ssusb_gadget_exit(ssusb);
378 ssusb_rscs_exit(ssusb);
380 pm_runtime_put_sync(dev);
381 pm_runtime_disable(dev);
386 static int mtu3_remove(struct platform_device *pdev)
388 struct ssusb_mtk *ssusb = platform_get_drvdata(pdev);
390 switch (ssusb->dr_mode) {
391 case USB_DR_MODE_PERIPHERAL:
392 ssusb_gadget_exit(ssusb);
394 case USB_DR_MODE_HOST:
395 ssusb_host_exit(ssusb);
397 case USB_DR_MODE_OTG:
398 ssusb_otg_switch_exit(ssusb);
399 ssusb_gadget_exit(ssusb);
400 ssusb_host_exit(ssusb);
406 ssusb_rscs_exit(ssusb);
407 pm_runtime_put_sync(&pdev->dev);
408 pm_runtime_disable(&pdev->dev);
414 * when support dual-role mode, we reject suspend when
415 * it works as device mode;
417 static int __maybe_unused mtu3_suspend(struct device *dev)
419 struct platform_device *pdev = to_platform_device(dev);
420 struct ssusb_mtk *ssusb = platform_get_drvdata(pdev);
422 dev_dbg(dev, "%s\n", __func__);
424 /* REVISIT: disconnect it for only device mode? */
428 ssusb_host_disable(ssusb, true);
429 ssusb_phy_power_off(ssusb);
430 clk_disable_unprepare(ssusb->sys_clk);
431 ssusb_wakeup_enable(ssusb);
436 static int __maybe_unused mtu3_resume(struct device *dev)
438 struct platform_device *pdev = to_platform_device(dev);
439 struct ssusb_mtk *ssusb = platform_get_drvdata(pdev);
441 dev_dbg(dev, "%s\n", __func__);
446 ssusb_wakeup_disable(ssusb);
447 clk_prepare_enable(ssusb->sys_clk);
448 ssusb_phy_power_on(ssusb);
449 ssusb_host_enable(ssusb);
454 static const struct dev_pm_ops mtu3_pm_ops = {
455 SET_SYSTEM_SLEEP_PM_OPS(mtu3_suspend, mtu3_resume)
458 #define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &mtu3_pm_ops : NULL)
462 static const struct of_device_id mtu3_of_match[] = {
463 {.compatible = "mediatek,mt8173-mtu3",},
467 MODULE_DEVICE_TABLE(of, mtu3_of_match);
471 static struct platform_driver mtu3_driver = {
473 .remove = mtu3_remove,
475 .name = MTU3_DRIVER_NAME,
477 .of_match_table = of_match_ptr(mtu3_of_match),
480 module_platform_driver(mtu3_driver);
482 MODULE_AUTHOR("Chunfeng Yun <chunfeng.yun@mediatek.com>");
483 MODULE_LICENSE("GPL v2");
484 MODULE_DESCRIPTION("MediaTek USB3 DRD Controller Driver");