drivers/usb/host/xhci-histb.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * xHCI host controller driver for HiSilicon STB SoCs
   4  *
   5  * Copyright (C) 2017-2018 HiSilicon Co., Ltd. http://www.hisilicon.com
   6  *
   7  * Authors: Jianguo Sun <sunjianguo1@huawei.com>
   8  */
   9
  10 #include <linux/clk.h>
  11 #include <linux/dma-mapping.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/reset.h>
  18
  19 #include "xhci.h"
  20
  21 #define GTXTHRCFG               0xc108
  22 #define GRXTHRCFG               0xc10c
  23 #define REG_GUSB2PHYCFG0        0xc200
  24 #define BIT_UTMI_8_16           BIT(3)
  25 #define BIT_UTMI_ULPI           BIT(4)
  26 #define BIT_FREECLK_EXIST       BIT(30)
  27
  28 #define REG_GUSB3PIPECTL0       0xc2c0
  29 #define USB3_DEEMPHASIS_MASK    GENMASK(2, 1)
  30 #define USB3_DEEMPHASIS0        BIT(1)
  31 #define USB3_TX_MARGIN1         BIT(4)
  32
  33 struct xhci_hcd_histb {
  34         struct device           *dev;
  35         struct usb_hcd          *hcd;
  36         void __iomem            *ctrl;
  37         struct clk              *bus_clk;
  38         struct clk              *utmi_clk;
  39         struct clk              *pipe_clk;
  40         struct clk              *suspend_clk;
  41         struct reset_control    *soft_reset;
  42 };
  43
  44 static inline struct xhci_hcd_histb *hcd_to_histb(struct usb_hcd *hcd)
  45 {
  46         return dev_get_drvdata(hcd->self.controller);
  47 }
  48
  49 static int xhci_histb_config(struct xhci_hcd_histb *histb)
  50 {
  51         struct device_node *np = histb->dev->of_node;
  52         u32 regval;
  53
  54         if (of_property_match_string(np, "phys-names", "inno") >= 0) {
  55                 /* USB2 PHY chose ulpi 8bit interface */
  56                 regval = readl(histb->ctrl + REG_GUSB2PHYCFG0);
  57                 regval &= ~BIT_UTMI_ULPI;
  58                 regval &= ~(BIT_UTMI_8_16);
  59                 regval &= ~BIT_FREECLK_EXIST;
  60                 writel(regval, histb->ctrl + REG_GUSB2PHYCFG0);
  61         }
  62
  63         if (of_property_match_string(np, "phys-names", "combo") >= 0) {
  64                 /*
  65                  * write 0x010c0012 to GUSB3PIPECTL0
  66                  * GUSB3PIPECTL0[5:3] = 010 : Tx Margin = 900mV ,
  67                  * decrease TX voltage
  68                  * GUSB3PIPECTL0[2:1] = 01 : Tx Deemphasis = -3.5dB,
  69                  * refer to xHCI spec
  70                  */
  71                 regval = readl(histb->ctrl + REG_GUSB3PIPECTL0);
  72                 regval &= ~USB3_DEEMPHASIS_MASK;
  73                 regval |= USB3_DEEMPHASIS0;
  74                 regval |= USB3_TX_MARGIN1;
  75                 writel(regval, histb->ctrl + REG_GUSB3PIPECTL0);
  76         }
  77
  78         writel(0x23100000, histb->ctrl + GTXTHRCFG);
  79         writel(0x23100000, histb->ctrl + GRXTHRCFG);
  80
  81         return 0;
  82 }
  83
  84 static int xhci_histb_clks_get(struct xhci_hcd_histb *histb)
  85 {
  86         struct device *dev = histb->dev;
  87
  88         histb->bus_clk = devm_clk_get(dev, "bus");
  89         if (IS_ERR(histb->bus_clk)) {
  90                 dev_err(dev, "fail to get bus clk\n");
  91                 return PTR_ERR(histb->bus_clk);
  92         }
  93
  94         histb->utmi_clk = devm_clk_get(dev, "utmi");
  95         if (IS_ERR(histb->utmi_clk)) {
  96                 dev_err(dev, "fail to get utmi clk\n");
  97                 return PTR_ERR(histb->utmi_clk);
  98         }
  99
 100         histb->pipe_clk = devm_clk_get(dev, "pipe");
 101         if (IS_ERR(histb->pipe_clk)) {
 102                 dev_err(dev, "fail to get pipe clk\n");
 103                 return PTR_ERR(histb->pipe_clk);
 104         }
 105
 106         histb->suspend_clk = devm_clk_get(dev, "suspend");
 107         if (IS_ERR(histb->suspend_clk)) {
 108                 dev_err(dev, "fail to get suspend clk\n");
 109                 return PTR_ERR(histb->suspend_clk);
 110         }
 111
 112         return 0;
 113 }
 114
 115 static int xhci_histb_host_enable(struct xhci_hcd_histb *histb)
 116 {
 117         int ret;
 118
 119         ret = clk_prepare_enable(histb->bus_clk);
 120         if (ret) {
 121                 dev_err(histb->dev, "failed to enable bus clk\n");
 122                 return ret;
 123         }
 124
 125         ret = clk_prepare_enable(histb->utmi_clk);
 126         if (ret) {
 127                 dev_err(histb->dev, "failed to enable utmi clk\n");
 128                 goto err_utmi_clk;
 129         }
 130
 131         ret = clk_prepare_enable(histb->pipe_clk);
 132         if (ret) {
 133                 dev_err(histb->dev, "failed to enable pipe clk\n");
 134                 goto err_pipe_clk;
 135         }
 136
 137         ret = clk_prepare_enable(histb->suspend_clk);
 138         if (ret) {
 139                 dev_err(histb->dev, "failed to enable suspend clk\n");
 140                 goto err_suspend_clk;
 141         }
 142
 143         reset_control_deassert(histb->soft_reset);
 144
 145         return 0;
 146
 147 err_suspend_clk:
 148         clk_disable_unprepare(histb->pipe_clk);
 149 err_pipe_clk:
 150         clk_disable_unprepare(histb->utmi_clk);
 151 err_utmi_clk:
 152         clk_disable_unprepare(histb->bus_clk);
 153
 154         return ret;
 155 }
 156
 157 static void xhci_histb_host_disable(struct xhci_hcd_histb *histb)
 158 {
 159         reset_control_assert(histb->soft_reset);
 160
 161         clk_disable_unprepare(histb->suspend_clk);
 162         clk_disable_unprepare(histb->pipe_clk);
 163         clk_disable_unprepare(histb->utmi_clk);
 164         clk_disable_unprepare(histb->bus_clk);
 165 }
 166
 167 static void xhci_histb_quirks(struct device *dev, struct xhci_hcd *xhci)
 168 {
 169         /*
 170          * As of now platform drivers don't provide MSI support so we ensure
 171          * here that the generic code does not try to make a pci_dev from our
 172          * dev struct in order to setup MSI
 173          */
 174         xhci->quirks |= XHCI_PLAT;
 175 }
 176
 177 /* called during probe() after chip reset completes */
 178 static int xhci_histb_setup(struct usb_hcd *hcd)
 179 {
 180         struct xhci_hcd_histb *histb = hcd_to_histb(hcd);
 181         int ret;
 182
 183         if (usb_hcd_is_primary_hcd(hcd)) {
 184                 ret = xhci_histb_config(histb);
 185                 if (ret)
 186                         return ret;
 187         }
 188
 189         return xhci_gen_setup(hcd, xhci_histb_quirks);
 190 }
 191
 192 static const struct xhci_driver_overrides xhci_histb_overrides __initconst = {
 193         .reset = xhci_histb_setup,
 194 };
 195
 196 static struct hc_driver __read_mostly xhci_histb_hc_driver;
 197 static int xhci_histb_probe(struct platform_device *pdev)
 198 {
 199         struct device *dev = &pdev->dev;
 200         struct xhci_hcd_histb *histb;
 201         const struct hc_driver *driver;
 202         struct usb_hcd *hcd;
 203         struct xhci_hcd *xhci;
 204         struct resource *res;
 205         int irq;
 206         int ret = -ENODEV;
 207
 208         if (usb_disabled())
 209                 return -ENODEV;
 210
 211         driver = &xhci_histb_hc_driver;
 212         histb = devm_kzalloc(dev, sizeof(*histb), GFP_KERNEL);
 213         if (!histb)
 214                 return -ENOMEM;
 215
 216         histb->dev = dev;
 217
 218         irq = platform_get_irq(pdev, 0);
 219         if (irq < 0)
 220                 return irq;
 221
 222         histb->ctrl = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 223         if (IS_ERR(histb->ctrl))
 224                 return PTR_ERR(histb->ctrl);
 225
 226         ret = xhci_histb_clks_get(histb);
 227         if (ret)
 228                 return ret;
 229
 230         histb->soft_reset = devm_reset_control_get(dev, "soft");
 231         if (IS_ERR(histb->soft_reset)) {
 232                 dev_err(dev, "failed to get soft reset\n");
 233                 return PTR_ERR(histb->soft_reset);
 234         }
 235
 236         pm_runtime_enable(dev);
 237         pm_runtime_get_sync(dev);
 238         device_enable_async_suspend(dev);
 239
 240         /* Initialize dma_mask and coherent_dma_mask to 32-bits */
 241         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 242         if (ret)
 243                 goto disable_pm;
 244
 245         hcd = usb_create_hcd(driver, dev, dev_name(dev));
 246         if (!hcd) {
 247                 ret = -ENOMEM;
 248                 goto disable_pm;
 249         }
 250
 251         hcd->regs = histb->ctrl;
 252         hcd->rsrc_start = res->start;
 253         hcd->rsrc_len = resource_size(res);
 254
 255         histb->hcd = hcd;
 256         dev_set_drvdata(hcd->self.controller, histb);
 257
 258         ret = xhci_histb_host_enable(histb);
 259         if (ret)
 260                 goto put_hcd;
 261
 262         xhci = hcd_to_xhci(hcd);
 263
 264         device_wakeup_enable(hcd->self.controller);
 265
 266         xhci->main_hcd = hcd;
 267         xhci->shared_hcd = usb_create_shared_hcd(driver, dev, dev_name(dev),
 268                                                  hcd);
 269         if (!xhci->shared_hcd) {
 270                 ret = -ENOMEM;
 271                 goto disable_host;
 272         }
 273
 274         if (device_property_read_bool(dev, "usb2-lpm-disable"))
 275                 xhci->quirks |= XHCI_HW_LPM_DISABLE;
 276
 277         if (device_property_read_bool(dev, "usb3-lpm-capable"))
 278                 xhci->quirks |= XHCI_LPM_SUPPORT;
 279
 280         /* imod_interval is the interrupt moderation value in nanoseconds. */
 281         xhci->imod_interval = 40000;
 282         device_property_read_u32(dev, "imod-interval-ns",
 283                                  &xhci->imod_interval);
 284
 285         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 286         if (ret)
 287                 goto put_usb3_hcd;
 288
 289         if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
 290                 xhci->shared_hcd->can_do_streams = 1;
 291
 292         ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
 293         if (ret)
 294                 goto dealloc_usb2_hcd;
 295
 296         device_enable_async_suspend(dev);
 297         pm_runtime_put_noidle(dev);
 298
 299         /*
 300          * Prevent runtime pm from being on as default, users should enable
 301          * runtime pm using power/control in sysfs.
 302          */
 303         pm_runtime_forbid(dev);
 304
 305         return 0;
 306
 307 dealloc_usb2_hcd:
 308         usb_remove_hcd(hcd);
 309 put_usb3_hcd:
 310         usb_put_hcd(xhci->shared_hcd);
 311 disable_host:
 312         xhci_histb_host_disable(histb);
 313 put_hcd:
 314         usb_put_hcd(hcd);
 315 disable_pm:
 316         pm_runtime_put_sync(dev);
 317         pm_runtime_disable(dev);
 318
 319         return ret;
 320 }
 321
 322 static int xhci_histb_remove(struct platform_device *dev)
 323 {
 324         struct xhci_hcd_histb *histb = platform_get_drvdata(dev);
 325         struct usb_hcd *hcd = histb->hcd;
 326         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 327         struct usb_hcd *shared_hcd = xhci->shared_hcd;
 328
 329         xhci->xhc_state |= XHCI_STATE_REMOVING;
 330
 331         usb_remove_hcd(shared_hcd);
 332         xhci->shared_hcd = NULL;
 333         device_wakeup_disable(&dev->dev);
 334
 335         usb_remove_hcd(hcd);
 336         usb_put_hcd(shared_hcd);
 337
 338         xhci_histb_host_disable(histb);
 339         usb_put_hcd(hcd);
 340         pm_runtime_put_sync(&dev->dev);
 341         pm_runtime_disable(&dev->dev);
 342
 343         return 0;
 344 }
 345
 346 static int __maybe_unused xhci_histb_suspend(struct device *dev)
 347 {
 348         struct xhci_hcd_histb *histb = dev_get_drvdata(dev);
 349         struct usb_hcd *hcd = histb->hcd;
 350         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 351         int ret;
 352
 353         ret = xhci_suspend(xhci, device_may_wakeup(dev));
 354
 355         if (!device_may_wakeup(dev))
 356                 xhci_histb_host_disable(histb);
 357
 358         return ret;
 359 }
 360
 361 static int __maybe_unused xhci_histb_resume(struct device *dev)
 362 {
 363         struct xhci_hcd_histb *histb = dev_get_drvdata(dev);
 364         struct usb_hcd *hcd = histb->hcd;
 365         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 366
 367         if (!device_may_wakeup(dev))
 368                 xhci_histb_host_enable(histb);
 369
 370         return xhci_resume(xhci, 0);
 371 }
 372
 373 static const struct dev_pm_ops xhci_histb_pm_ops = {
 374         SET_SYSTEM_SLEEP_PM_OPS(xhci_histb_suspend, xhci_histb_resume)
 375 };
 376 #define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &xhci_histb_pm_ops : NULL)
 377
 378 #ifdef CONFIG_OF
 379 static const struct of_device_id histb_xhci_of_match[] = {
 380         { .compatible = "hisilicon,hi3798cv200-xhci"},
 381         { },
 382 };
 383 MODULE_DEVICE_TABLE(of, histb_xhci_of_match);
 384 #endif
 385
 386 static struct platform_driver histb_xhci_driver = {
 387         .probe  = xhci_histb_probe,
 388         .remove = xhci_histb_remove,
 389         .driver = {
 390                 .name = "xhci-histb",
 391                 .pm = DEV_PM_OPS,
 392                 .of_match_table = of_match_ptr(histb_xhci_of_match),
 393         },
 394 };
 395 MODULE_ALIAS("platform:xhci-histb");
 396
 397 static int __init xhci_histb_init(void)
 398 {
 399         xhci_init_driver(&xhci_histb_hc_driver, &xhci_histb_overrides);
 400         return platform_driver_register(&histb_xhci_driver);
 401 }
 402 module_init(xhci_histb_init);
 403
 404 static void __exit xhci_histb_exit(void)
 405 {
 406         platform_driver_unregister(&histb_xhci_driver);
 407 }
 408 module_exit(xhci_histb_exit);
 409
 410 MODULE_DESCRIPTION("HiSilicon STB xHCI Host Controller Driver");
 411 MODULE_LICENSE("GPL v2");