Loading...
Note: File does not exist in v3.1.
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/clk.h>
9#include <linux/dma-mapping.h>
10#include <linux/iopoll.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/of_address.h>
14#include <linux/of_irq.h>
15#include <linux/platform_device.h>
16
17#include "mtu3.h"
18#include "mtu3_dr.h"
19#include "mtu3_debug.h"
20
21/* u2-port0 should be powered on and enabled; */
22int ssusb_check_clocks(struct ssusb_mtk *ssusb, u32 ex_clks)
23{
24 void __iomem *ibase = ssusb->ippc_base;
25 u32 value, check_val;
26 int ret;
27
28 check_val = ex_clks | SSUSB_SYS125_RST_B_STS | SSUSB_SYSPLL_STABLE |
29 SSUSB_REF_RST_B_STS;
30
31 ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS1, value,
32 (check_val == (value & check_val)), 100, 20000);
33 if (ret) {
34 dev_err(ssusb->dev, "clks of sts1 are not stable!\n");
35 return ret;
36 }
37
38 ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS2, value,
39 (value & SSUSB_U2_MAC_SYS_RST_B_STS), 100, 10000);
40 if (ret) {
41 dev_err(ssusb->dev, "mac2 clock is not stable\n");
42 return ret;
43 }
44
45 return 0;
46}
47
48static int ssusb_phy_init(struct ssusb_mtk *ssusb)
49{
50 int i;
51 int ret;
52
53 for (i = 0; i < ssusb->num_phys; i++) {
54 ret = phy_init(ssusb->phys[i]);
55 if (ret)
56 goto exit_phy;
57 }
58 return 0;
59
60exit_phy:
61 for (; i > 0; i--)
62 phy_exit(ssusb->phys[i - 1]);
63
64 return ret;
65}
66
67static int ssusb_phy_exit(struct ssusb_mtk *ssusb)
68{
69 int i;
70
71 for (i = 0; i < ssusb->num_phys; i++)
72 phy_exit(ssusb->phys[i]);
73
74 return 0;
75}
76
77static int ssusb_phy_power_on(struct ssusb_mtk *ssusb)
78{
79 int i;
80 int ret;
81
82 for (i = 0; i < ssusb->num_phys; i++) {
83 ret = phy_power_on(ssusb->phys[i]);
84 if (ret)
85 goto power_off_phy;
86 }
87 return 0;
88
89power_off_phy:
90 for (; i > 0; i--)
91 phy_power_off(ssusb->phys[i - 1]);
92
93 return ret;
94}
95
96static void ssusb_phy_power_off(struct ssusb_mtk *ssusb)
97{
98 unsigned int i;
99
100 for (i = 0; i < ssusb->num_phys; i++)
101 phy_power_off(ssusb->phys[i]);
102}
103
104static int ssusb_clks_enable(struct ssusb_mtk *ssusb)
105{
106 int ret;
107
108 ret = clk_prepare_enable(ssusb->sys_clk);
109 if (ret) {
110 dev_err(ssusb->dev, "failed to enable sys_clk\n");
111 goto sys_clk_err;
112 }
113
114 ret = clk_prepare_enable(ssusb->ref_clk);
115 if (ret) {
116 dev_err(ssusb->dev, "failed to enable ref_clk\n");
117 goto ref_clk_err;
118 }
119
120 ret = clk_prepare_enable(ssusb->mcu_clk);
121 if (ret) {
122 dev_err(ssusb->dev, "failed to enable mcu_clk\n");
123 goto mcu_clk_err;
124 }
125
126 ret = clk_prepare_enable(ssusb->dma_clk);
127 if (ret) {
128 dev_err(ssusb->dev, "failed to enable dma_clk\n");
129 goto dma_clk_err;
130 }
131
132 return 0;
133
134dma_clk_err:
135 clk_disable_unprepare(ssusb->mcu_clk);
136mcu_clk_err:
137 clk_disable_unprepare(ssusb->ref_clk);
138ref_clk_err:
139 clk_disable_unprepare(ssusb->sys_clk);
140sys_clk_err:
141 return ret;
142}
143
144static void ssusb_clks_disable(struct ssusb_mtk *ssusb)
145{
146 clk_disable_unprepare(ssusb->dma_clk);
147 clk_disable_unprepare(ssusb->mcu_clk);
148 clk_disable_unprepare(ssusb->ref_clk);
149 clk_disable_unprepare(ssusb->sys_clk);
150}
151
152static int ssusb_rscs_init(struct ssusb_mtk *ssusb)
153{
154 int ret = 0;
155
156 ret = regulator_enable(ssusb->vusb33);
157 if (ret) {
158 dev_err(ssusb->dev, "failed to enable vusb33\n");
159 goto vusb33_err;
160 }
161
162 ret = ssusb_clks_enable(ssusb);
163 if (ret)
164 goto clks_err;
165
166 ret = ssusb_phy_init(ssusb);
167 if (ret) {
168 dev_err(ssusb->dev, "failed to init phy\n");
169 goto phy_init_err;
170 }
171
172 ret = ssusb_phy_power_on(ssusb);
173 if (ret) {
174 dev_err(ssusb->dev, "failed to power on phy\n");
175 goto phy_err;
176 }
177
178 return 0;
179
180phy_err:
181 ssusb_phy_exit(ssusb);
182phy_init_err:
183 ssusb_clks_disable(ssusb);
184clks_err:
185 regulator_disable(ssusb->vusb33);
186vusb33_err:
187 return ret;
188}
189
190static void ssusb_rscs_exit(struct ssusb_mtk *ssusb)
191{
192 ssusb_clks_disable(ssusb);
193 regulator_disable(ssusb->vusb33);
194 ssusb_phy_power_off(ssusb);
195 ssusb_phy_exit(ssusb);
196}
197
198static void ssusb_ip_sw_reset(struct ssusb_mtk *ssusb)
199{
200 /* reset whole ip (xhci & u3d) */
201 mtu3_setbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
202 udelay(1);
203 mtu3_clrbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
204
205 /*
206 * device ip may be powered on in firmware/BROM stage before entering
207 * kernel stage;
208 * power down device ip, otherwise ip-sleep will fail when working as
209 * host only mode
210 */
211 mtu3_setbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
212}
213
214static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
215{
216 struct device_node *node = pdev->dev.of_node;
217 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
218 struct device *dev = &pdev->dev;
219 int i;
220 int ret;
221
222 ssusb->vusb33 = devm_regulator_get(dev, "vusb33");
223 if (IS_ERR(ssusb->vusb33)) {
224 dev_err(dev, "failed to get vusb33\n");
225 return PTR_ERR(ssusb->vusb33);
226 }
227
228 ssusb->sys_clk = devm_clk_get(dev, "sys_ck");
229 if (IS_ERR(ssusb->sys_clk)) {
230 dev_err(dev, "failed to get sys clock\n");
231 return PTR_ERR(ssusb->sys_clk);
232 }
233
234 ssusb->ref_clk = devm_clk_get_optional(dev, "ref_ck");
235 if (IS_ERR(ssusb->ref_clk))
236 return PTR_ERR(ssusb->ref_clk);
237
238 ssusb->mcu_clk = devm_clk_get_optional(dev, "mcu_ck");
239 if (IS_ERR(ssusb->mcu_clk))
240 return PTR_ERR(ssusb->mcu_clk);
241
242 ssusb->dma_clk = devm_clk_get_optional(dev, "dma_ck");
243 if (IS_ERR(ssusb->dma_clk))
244 return PTR_ERR(ssusb->dma_clk);
245
246 ssusb->num_phys = of_count_phandle_with_args(node,
247 "phys", "#phy-cells");
248 if (ssusb->num_phys > 0) {
249 ssusb->phys = devm_kcalloc(dev, ssusb->num_phys,
250 sizeof(*ssusb->phys), GFP_KERNEL);
251 if (!ssusb->phys)
252 return -ENOMEM;
253 } else {
254 ssusb->num_phys = 0;
255 }
256
257 for (i = 0; i < ssusb->num_phys; i++) {
258 ssusb->phys[i] = devm_of_phy_get_by_index(dev, node, i);
259 if (IS_ERR(ssusb->phys[i])) {
260 dev_err(dev, "failed to get phy-%d\n", i);
261 return PTR_ERR(ssusb->phys[i]);
262 }
263 }
264
265 ssusb->ippc_base = devm_platform_ioremap_resource_byname(pdev, "ippc");
266 if (IS_ERR(ssusb->ippc_base))
267 return PTR_ERR(ssusb->ippc_base);
268
269 ssusb->dr_mode = usb_get_dr_mode(dev);
270 if (ssusb->dr_mode == USB_DR_MODE_UNKNOWN)
271 ssusb->dr_mode = USB_DR_MODE_OTG;
272
273 if (ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
274 goto out;
275
276 /* if host role is supported */
277 ret = ssusb_wakeup_of_property_parse(ssusb, node);
278 if (ret) {
279 dev_err(dev, "failed to parse uwk property\n");
280 return ret;
281 }
282
283 /* optional property, ignore the error if it does not exist */
284 of_property_read_u32(node, "mediatek,u3p-dis-msk",
285 &ssusb->u3p_dis_msk);
286
287 otg_sx->vbus = devm_regulator_get(dev, "vbus");
288 if (IS_ERR(otg_sx->vbus)) {
289 dev_err(dev, "failed to get vbus\n");
290 return PTR_ERR(otg_sx->vbus);
291 }
292
293 if (ssusb->dr_mode == USB_DR_MODE_HOST)
294 goto out;
295
296 /* if dual-role mode is supported */
297 otg_sx->is_u3_drd = of_property_read_bool(node, "mediatek,usb3-drd");
298 otg_sx->manual_drd_enabled =
299 of_property_read_bool(node, "enable-manual-drd");
300 otg_sx->role_sw_used = of_property_read_bool(node, "usb-role-switch");
301
302 if (!otg_sx->role_sw_used && of_property_read_bool(node, "extcon")) {
303 otg_sx->edev = extcon_get_edev_by_phandle(ssusb->dev, 0);
304 if (IS_ERR(otg_sx->edev)) {
305 dev_err(ssusb->dev, "couldn't get extcon device\n");
306 return PTR_ERR(otg_sx->edev);
307 }
308 }
309
310out:
311 dev_info(dev, "dr_mode: %d, is_u3_dr: %d, u3p_dis_msk: %x, drd: %s\n",
312 ssusb->dr_mode, otg_sx->is_u3_drd, ssusb->u3p_dis_msk,
313 otg_sx->manual_drd_enabled ? "manual" : "auto");
314
315 return 0;
316}
317
318static int mtu3_probe(struct platform_device *pdev)
319{
320 struct device_node *node = pdev->dev.of_node;
321 struct device *dev = &pdev->dev;
322 struct ssusb_mtk *ssusb;
323 int ret = -ENOMEM;
324
325 /* all elements are set to ZERO as default value */
326 ssusb = devm_kzalloc(dev, sizeof(*ssusb), GFP_KERNEL);
327 if (!ssusb)
328 return -ENOMEM;
329
330 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
331 if (ret) {
332 dev_err(dev, "No suitable DMA config available\n");
333 return -ENOTSUPP;
334 }
335
336 platform_set_drvdata(pdev, ssusb);
337 ssusb->dev = dev;
338
339 ret = get_ssusb_rscs(pdev, ssusb);
340 if (ret)
341 return ret;
342
343 ssusb_debugfs_create_root(ssusb);
344
345 /* enable power domain */
346 pm_runtime_enable(dev);
347 pm_runtime_get_sync(dev);
348 device_enable_async_suspend(dev);
349
350 ret = ssusb_rscs_init(ssusb);
351 if (ret)
352 goto comm_init_err;
353
354 ssusb_ip_sw_reset(ssusb);
355
356 if (IS_ENABLED(CONFIG_USB_MTU3_HOST))
357 ssusb->dr_mode = USB_DR_MODE_HOST;
358 else if (IS_ENABLED(CONFIG_USB_MTU3_GADGET))
359 ssusb->dr_mode = USB_DR_MODE_PERIPHERAL;
360
361 /* default as host */
362 ssusb->is_host = !(ssusb->dr_mode == USB_DR_MODE_PERIPHERAL);
363
364 switch (ssusb->dr_mode) {
365 case USB_DR_MODE_PERIPHERAL:
366 ret = ssusb_gadget_init(ssusb);
367 if (ret) {
368 dev_err(dev, "failed to initialize gadget\n");
369 goto comm_exit;
370 }
371 break;
372 case USB_DR_MODE_HOST:
373 ret = ssusb_host_init(ssusb, node);
374 if (ret) {
375 dev_err(dev, "failed to initialize host\n");
376 goto comm_exit;
377 }
378 break;
379 case USB_DR_MODE_OTG:
380 ret = ssusb_gadget_init(ssusb);
381 if (ret) {
382 dev_err(dev, "failed to initialize gadget\n");
383 goto comm_exit;
384 }
385
386 ret = ssusb_host_init(ssusb, node);
387 if (ret) {
388 dev_err(dev, "failed to initialize host\n");
389 goto gadget_exit;
390 }
391
392 ret = ssusb_otg_switch_init(ssusb);
393 if (ret) {
394 dev_err(dev, "failed to initialize switch\n");
395 goto host_exit;
396 }
397 break;
398 default:
399 dev_err(dev, "unsupported mode: %d\n", ssusb->dr_mode);
400 ret = -EINVAL;
401 goto comm_exit;
402 }
403
404 return 0;
405
406host_exit:
407 ssusb_host_exit(ssusb);
408gadget_exit:
409 ssusb_gadget_exit(ssusb);
410comm_exit:
411 ssusb_rscs_exit(ssusb);
412comm_init_err:
413 pm_runtime_put_sync(dev);
414 pm_runtime_disable(dev);
415 ssusb_debugfs_remove_root(ssusb);
416
417 return ret;
418}
419
420static int mtu3_remove(struct platform_device *pdev)
421{
422 struct ssusb_mtk *ssusb = platform_get_drvdata(pdev);
423
424 switch (ssusb->dr_mode) {
425 case USB_DR_MODE_PERIPHERAL:
426 ssusb_gadget_exit(ssusb);
427 break;
428 case USB_DR_MODE_HOST:
429 ssusb_host_exit(ssusb);
430 break;
431 case USB_DR_MODE_OTG:
432 ssusb_otg_switch_exit(ssusb);
433 ssusb_gadget_exit(ssusb);
434 ssusb_host_exit(ssusb);
435 break;
436 default:
437 return -EINVAL;
438 }
439
440 ssusb_rscs_exit(ssusb);
441 pm_runtime_put_sync(&pdev->dev);
442 pm_runtime_disable(&pdev->dev);
443 ssusb_debugfs_remove_root(ssusb);
444
445 return 0;
446}
447
448/*
449 * when support dual-role mode, we reject suspend when
450 * it works as device mode;
451 */
452static int __maybe_unused mtu3_suspend(struct device *dev)
453{
454 struct ssusb_mtk *ssusb = dev_get_drvdata(dev);
455
456 dev_dbg(dev, "%s\n", __func__);
457
458 /* REVISIT: disconnect it for only device mode? */
459 if (!ssusb->is_host)
460 return 0;
461
462 ssusb_host_disable(ssusb, true);
463 ssusb_phy_power_off(ssusb);
464 ssusb_clks_disable(ssusb);
465 ssusb_wakeup_set(ssusb, true);
466
467 return 0;
468}
469
470static int __maybe_unused mtu3_resume(struct device *dev)
471{
472 struct ssusb_mtk *ssusb = dev_get_drvdata(dev);
473 int ret;
474
475 dev_dbg(dev, "%s\n", __func__);
476
477 if (!ssusb->is_host)
478 return 0;
479
480 ssusb_wakeup_set(ssusb, false);
481 ret = ssusb_clks_enable(ssusb);
482 if (ret)
483 goto clks_err;
484
485 ret = ssusb_phy_power_on(ssusb);
486 if (ret)
487 goto phy_err;
488
489 ssusb_host_enable(ssusb);
490
491 return 0;
492
493phy_err:
494 ssusb_clks_disable(ssusb);
495clks_err:
496 return ret;
497}
498
499static const struct dev_pm_ops mtu3_pm_ops = {
500 SET_SYSTEM_SLEEP_PM_OPS(mtu3_suspend, mtu3_resume)
501};
502
503#define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &mtu3_pm_ops : NULL)
504
505#ifdef CONFIG_OF
506
507static const struct of_device_id mtu3_of_match[] = {
508 {.compatible = "mediatek,mt8173-mtu3",},
509 {.compatible = "mediatek,mtu3",},
510 {},
511};
512
513MODULE_DEVICE_TABLE(of, mtu3_of_match);
514
515#endif
516
517static struct platform_driver mtu3_driver = {
518 .probe = mtu3_probe,
519 .remove = mtu3_remove,
520 .driver = {
521 .name = MTU3_DRIVER_NAME,
522 .pm = DEV_PM_OPS,
523 .of_match_table = of_match_ptr(mtu3_of_match),
524 },
525};
526module_platform_driver(mtu3_driver);
527
528MODULE_AUTHOR("Chunfeng Yun <chunfeng.yun@mediatek.com>");
529MODULE_LICENSE("GPL v2");
530MODULE_DESCRIPTION("MediaTek USB3 DRD Controller Driver");