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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2016 MediaTek Inc.
4 *
5 * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
6 */
7
8#include <linux/dma-mapping.h>
9#include <linux/iopoll.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/of_address.h>
13#include <linux/of_irq.h>
14#include <linux/platform_device.h>
15
16#include "mtu3.h"
17#include "mtu3_dr.h"
18#include "mtu3_debug.h"
19
20/* u2-port0 should be powered on and enabled; */
21int ssusb_check_clocks(struct ssusb_mtk *ssusb, u32 ex_clks)
22{
23 void __iomem *ibase = ssusb->ippc_base;
24 u32 value, check_val;
25 int ret;
26
27 check_val = ex_clks | SSUSB_SYS125_RST_B_STS | SSUSB_SYSPLL_STABLE |
28 SSUSB_REF_RST_B_STS;
29
30 ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS1, value,
31 (check_val == (value & check_val)), 100, 20000);
32 if (ret) {
33 dev_err(ssusb->dev, "clks of sts1 are not stable!\n");
34 return ret;
35 }
36
37 ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS2, value,
38 (value & SSUSB_U2_MAC_SYS_RST_B_STS), 100, 10000);
39 if (ret) {
40 dev_err(ssusb->dev, "mac2 clock is not stable\n");
41 return ret;
42 }
43
44 return 0;
45}
46
47static int ssusb_phy_init(struct ssusb_mtk *ssusb)
48{
49 int i;
50 int ret;
51
52 for (i = 0; i < ssusb->num_phys; i++) {
53 ret = phy_init(ssusb->phys[i]);
54 if (ret)
55 goto exit_phy;
56 }
57 return 0;
58
59exit_phy:
60 for (; i > 0; i--)
61 phy_exit(ssusb->phys[i - 1]);
62
63 return ret;
64}
65
66static int ssusb_phy_exit(struct ssusb_mtk *ssusb)
67{
68 int i;
69
70 for (i = 0; i < ssusb->num_phys; i++)
71 phy_exit(ssusb->phys[i]);
72
73 return 0;
74}
75
76static int ssusb_phy_power_on(struct ssusb_mtk *ssusb)
77{
78 int i;
79 int ret;
80
81 for (i = 0; i < ssusb->num_phys; i++) {
82 ret = phy_power_on(ssusb->phys[i]);
83 if (ret)
84 goto power_off_phy;
85 }
86 return 0;
87
88power_off_phy:
89 for (; i > 0; i--)
90 phy_power_off(ssusb->phys[i - 1]);
91
92 return ret;
93}
94
95static void ssusb_phy_power_off(struct ssusb_mtk *ssusb)
96{
97 unsigned int i;
98
99 for (i = 0; i < ssusb->num_phys; i++)
100 phy_power_off(ssusb->phys[i]);
101}
102
103static int ssusb_rscs_init(struct ssusb_mtk *ssusb)
104{
105 int ret = 0;
106
107 ret = regulator_enable(ssusb->vusb33);
108 if (ret) {
109 dev_err(ssusb->dev, "failed to enable vusb33\n");
110 goto vusb33_err;
111 }
112
113 ret = clk_bulk_prepare_enable(BULK_CLKS_CNT, ssusb->clks);
114 if (ret)
115 goto clks_err;
116
117 ret = ssusb_phy_init(ssusb);
118 if (ret) {
119 dev_err(ssusb->dev, "failed to init phy\n");
120 goto phy_init_err;
121 }
122
123 ret = ssusb_phy_power_on(ssusb);
124 if (ret) {
125 dev_err(ssusb->dev, "failed to power on phy\n");
126 goto phy_err;
127 }
128
129 return 0;
130
131phy_err:
132 ssusb_phy_exit(ssusb);
133phy_init_err:
134 clk_bulk_disable_unprepare(BULK_CLKS_CNT, ssusb->clks);
135clks_err:
136 regulator_disable(ssusb->vusb33);
137vusb33_err:
138 return ret;
139}
140
141static void ssusb_rscs_exit(struct ssusb_mtk *ssusb)
142{
143 clk_bulk_disable_unprepare(BULK_CLKS_CNT, ssusb->clks);
144 regulator_disable(ssusb->vusb33);
145 ssusb_phy_power_off(ssusb);
146 ssusb_phy_exit(ssusb);
147}
148
149static void ssusb_ip_sw_reset(struct ssusb_mtk *ssusb)
150{
151 /* reset whole ip (xhci & u3d) */
152 mtu3_setbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
153 udelay(1);
154 mtu3_clrbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
155
156 /*
157 * device ip may be powered on in firmware/BROM stage before entering
158 * kernel stage;
159 * power down device ip, otherwise ip-sleep will fail when working as
160 * host only mode
161 */
162 mtu3_setbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
163}
164
165static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
166{
167 struct device_node *node = pdev->dev.of_node;
168 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
169 struct clk_bulk_data *clks = ssusb->clks;
170 struct device *dev = &pdev->dev;
171 int i;
172 int ret;
173
174 ssusb->vusb33 = devm_regulator_get(dev, "vusb33");
175 if (IS_ERR(ssusb->vusb33)) {
176 dev_err(dev, "failed to get vusb33\n");
177 return PTR_ERR(ssusb->vusb33);
178 }
179
180 clks[0].id = "sys_ck";
181 clks[1].id = "ref_ck";
182 clks[2].id = "mcu_ck";
183 clks[3].id = "dma_ck";
184 ret = devm_clk_bulk_get_optional(dev, BULK_CLKS_CNT, clks);
185 if (ret)
186 return ret;
187
188 ssusb->num_phys = of_count_phandle_with_args(node,
189 "phys", "#phy-cells");
190 if (ssusb->num_phys > 0) {
191 ssusb->phys = devm_kcalloc(dev, ssusb->num_phys,
192 sizeof(*ssusb->phys), GFP_KERNEL);
193 if (!ssusb->phys)
194 return -ENOMEM;
195 } else {
196 ssusb->num_phys = 0;
197 }
198
199 for (i = 0; i < ssusb->num_phys; i++) {
200 ssusb->phys[i] = devm_of_phy_get_by_index(dev, node, i);
201 if (IS_ERR(ssusb->phys[i])) {
202 dev_err(dev, "failed to get phy-%d\n", i);
203 return PTR_ERR(ssusb->phys[i]);
204 }
205 }
206
207 ssusb->ippc_base = devm_platform_ioremap_resource_byname(pdev, "ippc");
208 if (IS_ERR(ssusb->ippc_base))
209 return PTR_ERR(ssusb->ippc_base);
210
211 ssusb->dr_mode = usb_get_dr_mode(dev);
212 if (ssusb->dr_mode == USB_DR_MODE_UNKNOWN)
213 ssusb->dr_mode = USB_DR_MODE_OTG;
214
215 if (ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
216 goto out;
217
218 /* if host role is supported */
219 ret = ssusb_wakeup_of_property_parse(ssusb, node);
220 if (ret) {
221 dev_err(dev, "failed to parse uwk property\n");
222 return ret;
223 }
224
225 /* optional property, ignore the error if it does not exist */
226 of_property_read_u32(node, "mediatek,u3p-dis-msk",
227 &ssusb->u3p_dis_msk);
228
229 otg_sx->vbus = devm_regulator_get(dev, "vbus");
230 if (IS_ERR(otg_sx->vbus)) {
231 dev_err(dev, "failed to get vbus\n");
232 return PTR_ERR(otg_sx->vbus);
233 }
234
235 if (ssusb->dr_mode == USB_DR_MODE_HOST)
236 goto out;
237
238 /* if dual-role mode is supported */
239 otg_sx->is_u3_drd = of_property_read_bool(node, "mediatek,usb3-drd");
240 otg_sx->manual_drd_enabled =
241 of_property_read_bool(node, "enable-manual-drd");
242 otg_sx->role_sw_used = of_property_read_bool(node, "usb-role-switch");
243
244 if (otg_sx->role_sw_used || otg_sx->manual_drd_enabled)
245 goto out;
246
247 if (of_property_read_bool(node, "extcon")) {
248 otg_sx->edev = extcon_get_edev_by_phandle(ssusb->dev, 0);
249 if (IS_ERR(otg_sx->edev)) {
250 return dev_err_probe(dev, PTR_ERR(otg_sx->edev),
251 "couldn't get extcon device\n");
252 }
253 }
254
255out:
256 dev_info(dev, "dr_mode: %d, is_u3_dr: %d, u3p_dis_msk: %x, drd: %s\n",
257 ssusb->dr_mode, otg_sx->is_u3_drd, ssusb->u3p_dis_msk,
258 otg_sx->manual_drd_enabled ? "manual" : "auto");
259
260 return 0;
261}
262
263static int mtu3_probe(struct platform_device *pdev)
264{
265 struct device_node *node = pdev->dev.of_node;
266 struct device *dev = &pdev->dev;
267 struct ssusb_mtk *ssusb;
268 int ret = -ENOMEM;
269
270 /* all elements are set to ZERO as default value */
271 ssusb = devm_kzalloc(dev, sizeof(*ssusb), GFP_KERNEL);
272 if (!ssusb)
273 return -ENOMEM;
274
275 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
276 if (ret) {
277 dev_err(dev, "No suitable DMA config available\n");
278 return -ENOTSUPP;
279 }
280
281 platform_set_drvdata(pdev, ssusb);
282 ssusb->dev = dev;
283
284 ret = get_ssusb_rscs(pdev, ssusb);
285 if (ret)
286 return ret;
287
288 ssusb_debugfs_create_root(ssusb);
289
290 /* enable power domain */
291 pm_runtime_enable(dev);
292 pm_runtime_get_sync(dev);
293 device_enable_async_suspend(dev);
294
295 ret = ssusb_rscs_init(ssusb);
296 if (ret)
297 goto comm_init_err;
298
299 ssusb_ip_sw_reset(ssusb);
300
301 if (IS_ENABLED(CONFIG_USB_MTU3_HOST))
302 ssusb->dr_mode = USB_DR_MODE_HOST;
303 else if (IS_ENABLED(CONFIG_USB_MTU3_GADGET))
304 ssusb->dr_mode = USB_DR_MODE_PERIPHERAL;
305
306 /* default as host */
307 ssusb->is_host = !(ssusb->dr_mode == USB_DR_MODE_PERIPHERAL);
308
309 switch (ssusb->dr_mode) {
310 case USB_DR_MODE_PERIPHERAL:
311 ret = ssusb_gadget_init(ssusb);
312 if (ret) {
313 dev_err(dev, "failed to initialize gadget\n");
314 goto comm_exit;
315 }
316 break;
317 case USB_DR_MODE_HOST:
318 ret = ssusb_host_init(ssusb, node);
319 if (ret) {
320 dev_err(dev, "failed to initialize host\n");
321 goto comm_exit;
322 }
323 break;
324 case USB_DR_MODE_OTG:
325 ret = ssusb_gadget_init(ssusb);
326 if (ret) {
327 dev_err(dev, "failed to initialize gadget\n");
328 goto comm_exit;
329 }
330
331 ret = ssusb_host_init(ssusb, node);
332 if (ret) {
333 dev_err(dev, "failed to initialize host\n");
334 goto gadget_exit;
335 }
336
337 ret = ssusb_otg_switch_init(ssusb);
338 if (ret) {
339 dev_err(dev, "failed to initialize switch\n");
340 goto host_exit;
341 }
342 break;
343 default:
344 dev_err(dev, "unsupported mode: %d\n", ssusb->dr_mode);
345 ret = -EINVAL;
346 goto comm_exit;
347 }
348
349 return 0;
350
351host_exit:
352 ssusb_host_exit(ssusb);
353gadget_exit:
354 ssusb_gadget_exit(ssusb);
355comm_exit:
356 ssusb_rscs_exit(ssusb);
357comm_init_err:
358 pm_runtime_put_sync(dev);
359 pm_runtime_disable(dev);
360 ssusb_debugfs_remove_root(ssusb);
361
362 return ret;
363}
364
365static int mtu3_remove(struct platform_device *pdev)
366{
367 struct ssusb_mtk *ssusb = platform_get_drvdata(pdev);
368
369 switch (ssusb->dr_mode) {
370 case USB_DR_MODE_PERIPHERAL:
371 ssusb_gadget_exit(ssusb);
372 break;
373 case USB_DR_MODE_HOST:
374 ssusb_host_exit(ssusb);
375 break;
376 case USB_DR_MODE_OTG:
377 ssusb_otg_switch_exit(ssusb);
378 ssusb_gadget_exit(ssusb);
379 ssusb_host_exit(ssusb);
380 break;
381 default:
382 return -EINVAL;
383 }
384
385 ssusb_rscs_exit(ssusb);
386 pm_runtime_put_sync(&pdev->dev);
387 pm_runtime_disable(&pdev->dev);
388 ssusb_debugfs_remove_root(ssusb);
389
390 return 0;
391}
392
393/*
394 * when support dual-role mode, we reject suspend when
395 * it works as device mode;
396 */
397static int __maybe_unused mtu3_suspend(struct device *dev)
398{
399 struct ssusb_mtk *ssusb = dev_get_drvdata(dev);
400
401 dev_dbg(dev, "%s\n", __func__);
402
403 /* REVISIT: disconnect it for only device mode? */
404 if (!ssusb->is_host)
405 return 0;
406
407 ssusb_host_disable(ssusb, true);
408 ssusb_phy_power_off(ssusb);
409 clk_bulk_disable_unprepare(BULK_CLKS_CNT, ssusb->clks);
410 ssusb_wakeup_set(ssusb, true);
411
412 return 0;
413}
414
415static int __maybe_unused mtu3_resume(struct device *dev)
416{
417 struct ssusb_mtk *ssusb = dev_get_drvdata(dev);
418 int ret;
419
420 dev_dbg(dev, "%s\n", __func__);
421
422 if (!ssusb->is_host)
423 return 0;
424
425 ssusb_wakeup_set(ssusb, false);
426 ret = clk_bulk_prepare_enable(BULK_CLKS_CNT, ssusb->clks);
427 if (ret)
428 goto clks_err;
429
430 ret = ssusb_phy_power_on(ssusb);
431 if (ret)
432 goto phy_err;
433
434 ssusb_host_enable(ssusb);
435
436 return 0;
437
438phy_err:
439 clk_bulk_disable_unprepare(BULK_CLKS_CNT, ssusb->clks);
440clks_err:
441 return ret;
442}
443
444static const struct dev_pm_ops mtu3_pm_ops = {
445 SET_SYSTEM_SLEEP_PM_OPS(mtu3_suspend, mtu3_resume)
446};
447
448#define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &mtu3_pm_ops : NULL)
449
450static const struct of_device_id mtu3_of_match[] = {
451 {.compatible = "mediatek,mt8173-mtu3",},
452 {.compatible = "mediatek,mtu3",},
453 {},
454};
455MODULE_DEVICE_TABLE(of, mtu3_of_match);
456
457static struct platform_driver mtu3_driver = {
458 .probe = mtu3_probe,
459 .remove = mtu3_remove,
460 .driver = {
461 .name = MTU3_DRIVER_NAME,
462 .pm = DEV_PM_OPS,
463 .of_match_table = mtu3_of_match,
464 },
465};
466module_platform_driver(mtu3_driver);
467
468MODULE_AUTHOR("Chunfeng Yun <chunfeng.yun@mediatek.com>");
469MODULE_LICENSE("GPL v2");
470MODULE_DESCRIPTION("MediaTek USB3 DRD Controller Driver");