1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2019 MediaTek Inc.
6 * Min Guo <min.guo@mediatek.com>
7 * Yonglong Wu <yonglong.wu@mediatek.com>
10 #include <linux/clk.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/module.h>
14 #include <linux/of_platform.h>
15 #include <linux/platform_device.h>
16 #include <linux/usb/role.h>
17 #include <linux/usb/usb_phy_generic.h>
18 #include "musb_core.h"
21 #define USB_L1INTS 0x00a0
22 #define USB_L1INTM 0x00a4
23 #define MTK_MUSB_TXFUNCADDR 0x0480
25 /* MediaTek controller toggle enable and status reg */
26 #define MUSB_RXTOG 0x80
27 #define MUSB_RXTOGEN 0x82
28 #define MUSB_TXTOG 0x84
29 #define MUSB_TXTOGEN 0x86
30 #define MTK_TOGGLE_EN GENMASK(15, 0)
32 #define TX_INT_STATUS BIT(0)
33 #define RX_INT_STATUS BIT(1)
34 #define USBCOM_INT_STATUS BIT(2)
35 #define DMA_INT_STATUS BIT(3)
37 #define DMA_INTR_STATUS_MSK GENMASK(7, 0)
38 #define DMA_INTR_UNMASK_SET_MSK GENMASK(31, 24)
40 #define MTK_MUSB_CLKS_NUM 3
45 struct platform_device *musb_pdev;
46 struct platform_device *usb_phy;
48 struct usb_phy *xceiv;
49 enum phy_mode phy_mode;
50 struct clk_bulk_data clks[MTK_MUSB_CLKS_NUM];
52 struct usb_role_switch *role_sw;
55 static int mtk_musb_clks_get(struct mtk_glue *glue)
57 struct device *dev = glue->dev;
59 glue->clks[0].id = "main";
60 glue->clks[1].id = "mcu";
61 glue->clks[2].id = "univpll";
63 return devm_clk_bulk_get(dev, MTK_MUSB_CLKS_NUM, glue->clks);
66 static int mtk_otg_switch_set(struct mtk_glue *glue, enum usb_role role)
68 struct musb *musb = glue->musb;
69 u8 devctl = readb(musb->mregs + MUSB_DEVCTL);
70 enum usb_role new_role;
72 if (role == glue->role)
77 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
78 glue->phy_mode = PHY_MODE_USB_HOST;
79 new_role = USB_ROLE_HOST;
80 if (glue->role == USB_ROLE_NONE)
81 phy_power_on(glue->phy);
83 devctl |= MUSB_DEVCTL_SESSION;
84 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
88 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
89 glue->phy_mode = PHY_MODE_USB_DEVICE;
90 new_role = USB_ROLE_DEVICE;
91 devctl &= ~MUSB_DEVCTL_SESSION;
92 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
93 if (glue->role == USB_ROLE_NONE)
94 phy_power_on(glue->phy);
99 glue->phy_mode = PHY_MODE_USB_OTG;
100 new_role = USB_ROLE_NONE;
101 devctl &= ~MUSB_DEVCTL_SESSION;
102 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
103 if (glue->role != USB_ROLE_NONE)
104 phy_power_off(glue->phy);
108 dev_err(glue->dev, "Invalid State\n");
112 glue->role = new_role;
113 phy_set_mode(glue->phy, glue->phy_mode);
118 static int musb_usb_role_sx_set(struct usb_role_switch *sw, enum usb_role role)
120 return mtk_otg_switch_set(usb_role_switch_get_drvdata(sw), role);
123 static enum usb_role musb_usb_role_sx_get(struct usb_role_switch *sw)
125 struct mtk_glue *glue = usb_role_switch_get_drvdata(sw);
130 static int mtk_otg_switch_init(struct mtk_glue *glue)
132 struct usb_role_switch_desc role_sx_desc = { 0 };
134 role_sx_desc.set = musb_usb_role_sx_set;
135 role_sx_desc.get = musb_usb_role_sx_get;
136 role_sx_desc.allow_userspace_control = true;
137 role_sx_desc.fwnode = dev_fwnode(glue->dev);
138 role_sx_desc.driver_data = glue;
139 glue->role_sw = usb_role_switch_register(glue->dev, &role_sx_desc);
141 return PTR_ERR_OR_ZERO(glue->role_sw);
144 static void mtk_otg_switch_exit(struct mtk_glue *glue)
146 return usb_role_switch_unregister(glue->role_sw);
149 static irqreturn_t generic_interrupt(int irq, void *__hci)
152 irqreturn_t retval = IRQ_NONE;
153 struct musb *musb = __hci;
155 spin_lock_irqsave(&musb->lock, flags);
156 musb->int_usb = musb_clearb(musb->mregs, MUSB_INTRUSB);
157 musb->int_rx = musb_clearw(musb->mregs, MUSB_INTRRX);
158 musb->int_tx = musb_clearw(musb->mregs, MUSB_INTRTX);
160 if ((musb->int_usb & MUSB_INTR_RESET) && !is_host_active(musb)) {
161 /* ep0 FADDR must be 0 when (re)entering peripheral mode */
162 musb_ep_select(musb->mregs, 0);
163 musb_writeb(musb->mregs, MUSB_FADDR, 0);
166 if (musb->int_usb || musb->int_tx || musb->int_rx)
167 retval = musb_interrupt(musb);
169 spin_unlock_irqrestore(&musb->lock, flags);
174 static irqreturn_t mtk_musb_interrupt(int irq, void *dev_id)
176 irqreturn_t retval = IRQ_NONE;
177 struct musb *musb = (struct musb *)dev_id;
180 l1_ints = musb_readl(musb->mregs, USB_L1INTS) &
181 musb_readl(musb->mregs, USB_L1INTM);
183 if (l1_ints & (TX_INT_STATUS | RX_INT_STATUS | USBCOM_INT_STATUS))
184 retval = generic_interrupt(irq, musb);
186 #if defined(CONFIG_USB_INVENTRA_DMA)
187 if (l1_ints & DMA_INT_STATUS)
188 retval = dma_controller_irq(irq, musb->dma_controller);
193 static u32 mtk_musb_busctl_offset(u8 epnum, u16 offset)
195 return MTK_MUSB_TXFUNCADDR + offset + 8 * epnum;
198 static u8 mtk_musb_clearb(void __iomem *addr, unsigned int offset)
203 data = musb_readb(addr, offset);
204 musb_writeb(addr, offset, data);
208 static u16 mtk_musb_clearw(void __iomem *addr, unsigned int offset)
213 data = musb_readw(addr, offset);
214 musb_writew(addr, offset, data);
218 static int mtk_musb_set_mode(struct musb *musb, u8 mode)
220 struct device *dev = musb->controller;
221 struct mtk_glue *glue = dev_get_drvdata(dev->parent);
222 enum phy_mode new_mode;
223 enum usb_role new_role;
227 new_mode = PHY_MODE_USB_HOST;
228 new_role = USB_ROLE_HOST;
230 case MUSB_PERIPHERAL:
231 new_mode = PHY_MODE_USB_DEVICE;
232 new_role = USB_ROLE_DEVICE;
235 new_mode = PHY_MODE_USB_OTG;
236 new_role = USB_ROLE_NONE;
239 dev_err(glue->dev, "Invalid mode request\n");
243 if (glue->phy_mode == new_mode)
246 if (musb->port_mode != MUSB_OTG) {
247 dev_err(glue->dev, "Does not support changing modes\n");
251 mtk_otg_switch_set(glue, new_role);
255 static int mtk_musb_init(struct musb *musb)
257 struct device *dev = musb->controller;
258 struct mtk_glue *glue = dev_get_drvdata(dev->parent);
262 musb->phy = glue->phy;
263 musb->xceiv = glue->xceiv;
264 musb->is_host = false;
265 musb->isr = mtk_musb_interrupt;
267 /* Set TX/RX toggle enable */
268 musb_writew(musb->mregs, MUSB_TXTOGEN, MTK_TOGGLE_EN);
269 musb_writew(musb->mregs, MUSB_RXTOGEN, MTK_TOGGLE_EN);
271 if (musb->port_mode == MUSB_OTG) {
272 ret = mtk_otg_switch_init(glue);
277 ret = phy_init(glue->phy);
281 ret = phy_power_on(glue->phy);
283 goto err_phy_power_on;
285 phy_set_mode(glue->phy, glue->phy_mode);
287 #if defined(CONFIG_USB_INVENTRA_DMA)
288 musb_writel(musb->mregs, MUSB_HSDMA_INTR,
289 DMA_INTR_STATUS_MSK | DMA_INTR_UNMASK_SET_MSK);
291 musb_writel(musb->mregs, USB_L1INTM, TX_INT_STATUS | RX_INT_STATUS |
292 USBCOM_INT_STATUS | DMA_INT_STATUS);
298 if (musb->port_mode == MUSB_OTG)
299 mtk_otg_switch_exit(glue);
303 static u16 mtk_musb_get_toggle(struct musb_qh *qh, int is_out)
305 struct musb *musb = qh->hw_ep->musb;
306 u8 epnum = qh->hw_ep->epnum;
309 toggle = musb_readw(musb->mregs, is_out ? MUSB_TXTOG : MUSB_RXTOG);
310 return toggle & (1 << epnum);
313 static u16 mtk_musb_set_toggle(struct musb_qh *qh, int is_out, struct urb *urb)
315 struct musb *musb = qh->hw_ep->musb;
316 u8 epnum = qh->hw_ep->epnum;
319 toggle = usb_gettoggle(urb->dev, qh->epnum, is_out);
322 value = musb_readw(musb->mregs, MUSB_TXTOG);
323 value |= toggle << epnum;
324 musb_writew(musb->mregs, MUSB_TXTOG, value);
326 value = musb_readw(musb->mregs, MUSB_RXTOG);
327 value |= toggle << epnum;
328 musb_writew(musb->mregs, MUSB_RXTOG, value);
334 static int mtk_musb_exit(struct musb *musb)
336 struct device *dev = musb->controller;
337 struct mtk_glue *glue = dev_get_drvdata(dev->parent);
339 mtk_otg_switch_exit(glue);
340 phy_power_off(glue->phy);
342 clk_bulk_disable_unprepare(MTK_MUSB_CLKS_NUM, glue->clks);
344 pm_runtime_put_sync(dev);
345 pm_runtime_disable(dev);
349 static const struct musb_platform_ops mtk_musb_ops = {
350 .quirks = MUSB_DMA_INVENTRA,
351 .init = mtk_musb_init,
352 .get_toggle = mtk_musb_get_toggle,
353 .set_toggle = mtk_musb_set_toggle,
354 .exit = mtk_musb_exit,
355 #ifdef CONFIG_USB_INVENTRA_DMA
356 .dma_init = musbhs_dma_controller_create_noirq,
357 .dma_exit = musbhs_dma_controller_destroy,
359 .clearb = mtk_musb_clearb,
360 .clearw = mtk_musb_clearw,
361 .busctl_offset = mtk_musb_busctl_offset,
362 .set_mode = mtk_musb_set_mode,
365 #define MTK_MUSB_MAX_EP_NUM 8
366 #define MTK_MUSB_RAM_BITS 11
368 static struct musb_fifo_cfg mtk_musb_mode_cfg[] = {
369 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
370 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
371 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
372 { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
373 { .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
374 { .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
375 { .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
376 { .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
377 { .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
378 { .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
379 { .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 1024, },
380 { .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 1024, },
381 { .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, },
382 { .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 64, },
385 static const struct musb_hdrc_config mtk_musb_hdrc_config = {
386 .fifo_cfg = mtk_musb_mode_cfg,
387 .fifo_cfg_size = ARRAY_SIZE(mtk_musb_mode_cfg),
390 .num_eps = MTK_MUSB_MAX_EP_NUM,
391 .ram_bits = MTK_MUSB_RAM_BITS,
394 static const struct platform_device_info mtk_dev_info = {
396 .id = PLATFORM_DEVID_AUTO,
397 .dma_mask = DMA_BIT_MASK(32),
400 static int mtk_musb_probe(struct platform_device *pdev)
402 struct musb_hdrc_platform_data *pdata;
403 struct mtk_glue *glue;
404 struct platform_device_info pinfo;
405 struct device *dev = &pdev->dev;
406 struct device_node *np = dev->of_node;
409 glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL);
414 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
418 ret = of_platform_populate(np, NULL, NULL, dev);
420 dev_err(dev, "failed to create child devices at %p\n", np);
424 ret = mtk_musb_clks_get(glue);
428 pdata->config = &mtk_musb_hdrc_config;
429 pdata->platform_ops = &mtk_musb_ops;
430 pdata->mode = usb_get_dr_mode(dev);
432 if (IS_ENABLED(CONFIG_USB_MUSB_HOST))
433 pdata->mode = USB_DR_MODE_HOST;
434 else if (IS_ENABLED(CONFIG_USB_MUSB_GADGET))
435 pdata->mode = USB_DR_MODE_PERIPHERAL;
437 switch (pdata->mode) {
438 case USB_DR_MODE_HOST:
439 glue->phy_mode = PHY_MODE_USB_HOST;
440 glue->role = USB_ROLE_HOST;
442 case USB_DR_MODE_PERIPHERAL:
443 glue->phy_mode = PHY_MODE_USB_DEVICE;
444 glue->role = USB_ROLE_DEVICE;
446 case USB_DR_MODE_OTG:
447 glue->phy_mode = PHY_MODE_USB_OTG;
448 glue->role = USB_ROLE_NONE;
451 dev_err(&pdev->dev, "Error 'dr_mode' property\n");
455 glue->phy = devm_of_phy_get_by_index(dev, np, 0);
456 if (IS_ERR(glue->phy)) {
457 dev_err(dev, "fail to getting phy %ld\n",
459 return PTR_ERR(glue->phy);
462 glue->usb_phy = usb_phy_generic_register();
463 if (IS_ERR(glue->usb_phy)) {
464 dev_err(dev, "fail to registering usb-phy %ld\n",
465 PTR_ERR(glue->usb_phy));
466 return PTR_ERR(glue->usb_phy);
469 glue->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
470 if (IS_ERR(glue->xceiv)) {
471 ret = PTR_ERR(glue->xceiv);
472 dev_err(dev, "fail to getting usb-phy %d\n", ret);
473 goto err_unregister_usb_phy;
476 platform_set_drvdata(pdev, glue);
477 pm_runtime_enable(dev);
478 pm_runtime_get_sync(dev);
480 ret = clk_bulk_prepare_enable(MTK_MUSB_CLKS_NUM, glue->clks);
484 pinfo = mtk_dev_info;
486 pinfo.res = pdev->resource;
487 pinfo.num_res = pdev->num_resources;
489 pinfo.size_data = sizeof(*pdata);
490 pinfo.fwnode = of_fwnode_handle(np);
491 pinfo.of_node_reused = true;
493 glue->musb_pdev = platform_device_register_full(&pinfo);
494 if (IS_ERR(glue->musb_pdev)) {
495 ret = PTR_ERR(glue->musb_pdev);
496 dev_err(dev, "failed to register musb device: %d\n", ret);
497 goto err_device_register;
503 clk_bulk_disable_unprepare(MTK_MUSB_CLKS_NUM, glue->clks);
505 pm_runtime_put_sync(dev);
506 pm_runtime_disable(dev);
507 err_unregister_usb_phy:
508 usb_phy_generic_unregister(glue->usb_phy);
512 static void mtk_musb_remove(struct platform_device *pdev)
514 struct mtk_glue *glue = platform_get_drvdata(pdev);
515 struct platform_device *usb_phy = glue->usb_phy;
517 platform_device_unregister(glue->musb_pdev);
518 usb_phy_generic_unregister(usb_phy);
522 static const struct of_device_id mtk_musb_match[] = {
523 {.compatible = "mediatek,mtk-musb",},
526 MODULE_DEVICE_TABLE(of, mtk_musb_match);
529 static struct platform_driver mtk_musb_driver = {
530 .probe = mtk_musb_probe,
531 .remove_new = mtk_musb_remove,
534 .of_match_table = of_match_ptr(mtk_musb_match),
538 module_platform_driver(mtk_musb_driver);
540 MODULE_DESCRIPTION("MediaTek MUSB Glue Layer");
541 MODULE_AUTHOR("Min Guo <min.guo@mediatek.com>");
542 MODULE_LICENSE("GPL v2");