drivers/usb/musb/mediatek.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2019 MediaTek Inc.
   4  *
   5  * Author:
   6  *  Min Guo <[email protected]>
   7  *  Yonglong Wu <[email protected]>
   8  */
   9
  10 #include <linux/clk.h>
  11 #include <linux/dma-mapping.h>
  12 #include <linux/module.h>
  13 #include <linux/of.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"
  19 #include "musb_dma.h"
  20
  21 #define USB_L1INTS              0x00a0
  22 #define USB_L1INTM              0x00a4
  23 #define MTK_MUSB_TXFUNCADDR     0x0480
  24
  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)
  31
  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)
  36
  37 #define DMA_INTR_STATUS_MSK     GENMASK(7, 0)
  38 #define DMA_INTR_UNMASK_SET_MSK GENMASK(31, 24)
  39
  40 #define MTK_MUSB_CLKS_NUM       3
  41
  42 struct mtk_glue {
  43         struct device *dev;
  44         struct musb *musb;
  45         struct platform_device *musb_pdev;
  46         struct platform_device *usb_phy;
  47         struct phy *phy;
  48         struct usb_phy *xceiv;
  49         enum phy_mode phy_mode;
  50         struct clk_bulk_data clks[MTK_MUSB_CLKS_NUM];
  51         enum usb_role role;
  52         struct usb_role_switch *role_sw;
  53 };
  54
  55 static int mtk_musb_clks_get(struct mtk_glue *glue)
  56 {
  57         struct device *dev = glue->dev;
  58
  59         glue->clks[0].id = "main";
  60         glue->clks[1].id = "mcu";
  61         glue->clks[2].id = "univpll";
  62
  63         return devm_clk_bulk_get(dev, MTK_MUSB_CLKS_NUM, glue->clks);
  64 }
  65
  66 static int mtk_otg_switch_set(struct mtk_glue *glue, enum usb_role role)
  67 {
  68         struct musb *musb = glue->musb;
  69         u8 devctl = readb(musb->mregs + MUSB_DEVCTL);
  70         enum usb_role new_role;
  71
  72         if (role == glue->role)
  73                 return 0;
  74
  75         switch (role) {
  76         case USB_ROLE_HOST:
  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);
  82
  83                 devctl |= MUSB_DEVCTL_SESSION;
  84                 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
  85                 MUSB_HST_MODE(musb);
  86                 break;
  87         case USB_ROLE_DEVICE:
  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);
  95
  96                 MUSB_DEV_MODE(musb);
  97                 break;
  98         case USB_ROLE_NONE:
  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);
 105
 106                 break;
 107         default:
 108                 dev_err(glue->dev, "Invalid State\n");
 109                 return -EINVAL;
 110         }
 111
 112         glue->role = new_role;
 113         phy_set_mode(glue->phy, glue->phy_mode);
 114
 115         return 0;
 116 }
 117
 118 static int musb_usb_role_sx_set(struct usb_role_switch *sw, enum usb_role role)
 119 {
 120         return mtk_otg_switch_set(usb_role_switch_get_drvdata(sw), role);
 121 }
 122
 123 static enum usb_role musb_usb_role_sx_get(struct usb_role_switch *sw)
 124 {
 125         struct mtk_glue *glue = usb_role_switch_get_drvdata(sw);
 126
 127         return glue->role;
 128 }
 129
 130 static int mtk_otg_switch_init(struct mtk_glue *glue)
 131 {
 132         struct usb_role_switch_desc role_sx_desc = { 0 };
 133
 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);
 140
 141         return PTR_ERR_OR_ZERO(glue->role_sw);
 142 }
 143
 144 static void mtk_otg_switch_exit(struct mtk_glue *glue)
 145 {
 146         return usb_role_switch_unregister(glue->role_sw);
 147 }
 148
 149 static irqreturn_t generic_interrupt(int irq, void *__hci)
 150 {
 151         unsigned long flags;
 152         irqreturn_t retval = IRQ_NONE;
 153         struct musb *musb = __hci;
 154
 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);
 159
 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);
 164         }
 165
 166         if (musb->int_usb || musb->int_tx || musb->int_rx)
 167                 retval = musb_interrupt(musb);
 168
 169         spin_unlock_irqrestore(&musb->lock, flags);
 170
 171         return retval;
 172 }
 173
 174 static irqreturn_t mtk_musb_interrupt(int irq, void *dev_id)
 175 {
 176         irqreturn_t retval = IRQ_NONE;
 177         struct musb *musb = (struct musb *)dev_id;
 178         u32 l1_ints;
 179
 180         l1_ints = musb_readl(musb->mregs, USB_L1INTS) &
 181                         musb_readl(musb->mregs, USB_L1INTM);
 182
 183         if (l1_ints & (TX_INT_STATUS | RX_INT_STATUS | USBCOM_INT_STATUS))
 184                 retval = generic_interrupt(irq, musb);
 185
 186 #if defined(CONFIG_USB_INVENTRA_DMA)
 187         if (l1_ints & DMA_INT_STATUS)
 188                 retval = dma_controller_irq(irq, musb->dma_controller);
 189 #endif
 190         return retval;
 191 }
 192
 193 static u32 mtk_musb_busctl_offset(u8 epnum, u16 offset)
 194 {
 195         return MTK_MUSB_TXFUNCADDR + offset + 8 * epnum;
 196 }
 197
 198 static u8 mtk_musb_clearb(void __iomem *addr, unsigned int offset)
 199 {
 200         u8 data;
 201
 202         /* W1C */
 203         data = musb_readb(addr, offset);
 204         musb_writeb(addr, offset, data);
 205         return data;
 206 }
 207
 208 static u16 mtk_musb_clearw(void __iomem *addr, unsigned int offset)
 209 {
 210         u16 data;
 211
 212         /* W1C */
 213         data = musb_readw(addr, offset);
 214         musb_writew(addr, offset, data);
 215         return data;
 216 }
 217
 218 static int mtk_musb_set_mode(struct musb *musb, u8 mode)
 219 {
 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;
 224
 225         switch (mode) {
 226         case MUSB_HOST:
 227                 new_mode = PHY_MODE_USB_HOST;
 228                 new_role = USB_ROLE_HOST;
 229                 break;
 230         case MUSB_PERIPHERAL:
 231                 new_mode = PHY_MODE_USB_DEVICE;
 232                 new_role = USB_ROLE_DEVICE;
 233                 break;
 234         case MUSB_OTG:
 235                 new_mode = PHY_MODE_USB_OTG;
 236                 new_role = USB_ROLE_NONE;
 237                 break;
 238         default:
 239                 dev_err(glue->dev, "Invalid mode request\n");
 240                 return -EINVAL;
 241         }
 242
 243         if (glue->phy_mode == new_mode)
 244                 return 0;
 245
 246         if (musb->port_mode != MUSB_OTG) {
 247                 dev_err(glue->dev, "Does not support changing modes\n");
 248                 return -EINVAL;
 249         }
 250
 251         mtk_otg_switch_set(glue, new_role);
 252         return 0;
 253 }
 254
 255 static int mtk_musb_init(struct musb *musb)
 256 {
 257         struct device *dev = musb->controller;
 258         struct mtk_glue *glue = dev_get_drvdata(dev->parent);
 259         int ret;
 260
 261         glue->musb = musb;
 262         musb->phy = glue->phy;
 263         musb->xceiv = glue->xceiv;
 264         musb->is_host = false;
 265         musb->isr = mtk_musb_interrupt;
 266
 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);
 270
 271         if (musb->port_mode == MUSB_OTG) {
 272                 ret = mtk_otg_switch_init(glue);
 273                 if (ret)
 274                         return ret;
 275         }
 276
 277         ret = phy_init(glue->phy);
 278         if (ret)
 279                 goto err_phy_init;
 280
 281         ret = phy_power_on(glue->phy);
 282         if (ret)
 283                 goto err_phy_power_on;
 284
 285         phy_set_mode(glue->phy, glue->phy_mode);
 286
 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);
 290 #endif
 291         musb_writel(musb->mregs, USB_L1INTM, TX_INT_STATUS | RX_INT_STATUS |
 292                     USBCOM_INT_STATUS | DMA_INT_STATUS);
 293         return 0;
 294
 295 err_phy_power_on:
 296         phy_exit(glue->phy);
 297 err_phy_init:
 298         if (musb->port_mode == MUSB_OTG)
 299                 mtk_otg_switch_exit(glue);
 300         return ret;
 301 }
 302
 303 static u16 mtk_musb_get_toggle(struct musb_qh *qh, int is_out)
 304 {
 305         struct musb *musb = qh->hw_ep->musb;
 306         u8 epnum = qh->hw_ep->epnum;
 307         u16 toggle;
 308
 309         toggle = musb_readw(musb->mregs, is_out ? MUSB_TXTOG : MUSB_RXTOG);
 310         return toggle & (1 << epnum);
 311 }
 312
 313 static u16 mtk_musb_set_toggle(struct musb_qh *qh, int is_out, struct urb *urb)
 314 {
 315         struct musb *musb = qh->hw_ep->musb;
 316         u8 epnum = qh->hw_ep->epnum;
 317         u16 value, toggle;
 318
 319         toggle = usb_gettoggle(urb->dev, qh->epnum, is_out);
 320
 321         if (is_out) {
 322                 value = musb_readw(musb->mregs, MUSB_TXTOG);
 323                 value |= toggle << epnum;
 324                 musb_writew(musb->mregs, MUSB_TXTOG, value);
 325         } else {
 326                 value = musb_readw(musb->mregs, MUSB_RXTOG);
 327                 value |= toggle << epnum;
 328                 musb_writew(musb->mregs, MUSB_RXTOG, value);
 329         }
 330
 331         return 0;
 332 }
 333
 334 static int mtk_musb_exit(struct musb *musb)
 335 {
 336         struct device *dev = musb->controller;
 337         struct mtk_glue *glue = dev_get_drvdata(dev->parent);
 338
 339         mtk_otg_switch_exit(glue);
 340         phy_power_off(glue->phy);
 341         phy_exit(glue->phy);
 342         clk_bulk_disable_unprepare(MTK_MUSB_CLKS_NUM, glue->clks);
 343
 344         pm_runtime_put_sync(dev);
 345         pm_runtime_disable(dev);
 346         return 0;
 347 }
 348
 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,
 358 #endif
 359         .clearb = mtk_musb_clearb,
 360         .clearw = mtk_musb_clearw,
 361         .busctl_offset = mtk_musb_busctl_offset,
 362         .set_mode = mtk_musb_set_mode,
 363 };
 364
 365 #define MTK_MUSB_MAX_EP_NUM     8
 366 #define MTK_MUSB_RAM_BITS       11
 367
 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, },
 383 };
 384
 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),
 388         .multipoint = true,
 389         .dyn_fifo = true,
 390         .num_eps = MTK_MUSB_MAX_EP_NUM,
 391         .ram_bits = MTK_MUSB_RAM_BITS,
 392 };
 393
 394 static const struct platform_device_info mtk_dev_info = {
 395         .name = "musb-hdrc",
 396         .id = PLATFORM_DEVID_AUTO,
 397         .dma_mask = DMA_BIT_MASK(32),
 398 };
 399
 400 static int mtk_musb_probe(struct platform_device *pdev)
 401 {
 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;
 407         int ret;
 408
 409         glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL);
 410         if (!glue)
 411                 return -ENOMEM;
 412
 413         glue->dev = dev;
 414         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 415         if (!pdata)
 416                 return -ENOMEM;
 417
 418         ret = of_platform_populate(np, NULL, NULL, dev);
 419         if (ret)
 420                 return dev_err_probe(dev, ret,
 421                                 "failed to create child devices at %p\n", np);
 422
 423         ret = mtk_musb_clks_get(glue);
 424         if (ret)
 425                 return ret;
 426
 427         pdata->config = &mtk_musb_hdrc_config;
 428         pdata->platform_ops = &mtk_musb_ops;
 429         pdata->mode = usb_get_dr_mode(dev);
 430
 431         if (IS_ENABLED(CONFIG_USB_MUSB_HOST))
 432                 pdata->mode = USB_DR_MODE_HOST;
 433         else if (IS_ENABLED(CONFIG_USB_MUSB_GADGET))
 434                 pdata->mode = USB_DR_MODE_PERIPHERAL;
 435
 436         switch (pdata->mode) {
 437         case USB_DR_MODE_HOST:
 438                 glue->phy_mode = PHY_MODE_USB_HOST;
 439                 glue->role = USB_ROLE_HOST;
 440                 break;
 441         case USB_DR_MODE_PERIPHERAL:
 442                 glue->phy_mode = PHY_MODE_USB_DEVICE;
 443                 glue->role = USB_ROLE_DEVICE;
 444                 break;
 445         case USB_DR_MODE_OTG:
 446                 glue->phy_mode = PHY_MODE_USB_OTG;
 447                 glue->role = USB_ROLE_NONE;
 448                 break;
 449         default:
 450                 return dev_err_probe(&pdev->dev, -EINVAL,
 451                                 "Error 'dr_mode' property\n");
 452         }
 453
 454         glue->phy = devm_of_phy_get_by_index(dev, np, 0);
 455         if (IS_ERR(glue->phy))
 456                 return dev_err_probe(dev, PTR_ERR(glue->phy),
 457                                 "fail to getting phy\n");
 458
 459         glue->usb_phy = usb_phy_generic_register();
 460         if (IS_ERR(glue->usb_phy))
 461                 return dev_err_probe(dev, PTR_ERR(glue->usb_phy),
 462                                 "fail to registering usb-phy\n");
 463
 464         glue->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
 465         if (IS_ERR(glue->xceiv)) {
 466                 ret = PTR_ERR(glue->xceiv);
 467                 dev_err(dev, "fail to getting usb-phy %d\n", ret);
 468                 goto err_unregister_usb_phy;
 469         }
 470
 471         platform_set_drvdata(pdev, glue);
 472         pm_runtime_enable(dev);
 473         pm_runtime_get_sync(dev);
 474
 475         ret = clk_bulk_prepare_enable(MTK_MUSB_CLKS_NUM, glue->clks);
 476         if (ret)
 477                 goto err_enable_clk;
 478
 479         pinfo = mtk_dev_info;
 480         pinfo.parent = dev;
 481         pinfo.res = pdev->resource;
 482         pinfo.num_res = pdev->num_resources;
 483         pinfo.data = pdata;
 484         pinfo.size_data = sizeof(*pdata);
 485         pinfo.fwnode = of_fwnode_handle(np);
 486         pinfo.of_node_reused = true;
 487
 488         glue->musb_pdev = platform_device_register_full(&pinfo);
 489         if (IS_ERR(glue->musb_pdev)) {
 490                 ret = PTR_ERR(glue->musb_pdev);
 491                 dev_err(dev, "failed to register musb device: %d\n", ret);
 492                 goto err_device_register;
 493         }
 494
 495         return 0;
 496
 497 err_device_register:
 498         clk_bulk_disable_unprepare(MTK_MUSB_CLKS_NUM, glue->clks);
 499 err_enable_clk:
 500         pm_runtime_put_sync(dev);
 501         pm_runtime_disable(dev);
 502 err_unregister_usb_phy:
 503         usb_phy_generic_unregister(glue->usb_phy);
 504         return ret;
 505 }
 506
 507 static void mtk_musb_remove(struct platform_device *pdev)
 508 {
 509         struct mtk_glue *glue = platform_get_drvdata(pdev);
 510         struct platform_device *usb_phy = glue->usb_phy;
 511
 512         platform_device_unregister(glue->musb_pdev);
 513         usb_phy_generic_unregister(usb_phy);
 514 }
 515
 516 #ifdef CONFIG_OF
 517 static const struct of_device_id mtk_musb_match[] = {
 518         {.compatible = "mediatek,mtk-musb",},
 519         {},
 520 };
 521 MODULE_DEVICE_TABLE(of, mtk_musb_match);
 522 #endif
 523
 524 static struct platform_driver mtk_musb_driver = {
 525         .probe = mtk_musb_probe,
 526         .remove = mtk_musb_remove,
 527         .driver = {
 528                    .name = "musb-mtk",
 529                    .of_match_table = of_match_ptr(mtk_musb_match),
 530         },
 531 };
 532
 533 module_platform_driver(mtk_musb_driver);
 534
 535 MODULE_DESCRIPTION("MediaTek MUSB Glue Layer");
 536 MODULE_AUTHOR("Min Guo <[email protected]>");
 537 MODULE_LICENSE("GPL v2");