drivers/usb/cdns3/cdns3-imx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /**
   3  * cdns3-imx.c - NXP i.MX specific Glue layer for Cadence USB Controller
   4  *
   5  * Copyright (C) 2019 NXP
   6  */
   7
   8 #include <linux/bits.h>
   9 #include <linux/clk.h>
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/dma-mapping.h>
  15 #include <linux/io.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/iopoll.h>
  18 #include <linux/pm_runtime.h>
  19 #include "core.h"
  20
  21 #define USB3_CORE_CTRL1    0x00
  22 #define USB3_CORE_CTRL2    0x04
  23 #define USB3_INT_REG       0x08
  24 #define USB3_CORE_STATUS   0x0c
  25 #define XHCI_DEBUG_LINK_ST 0x10
  26 #define XHCI_DEBUG_BUS     0x14
  27 #define USB3_SSPHY_CTRL1   0x40
  28 #define USB3_SSPHY_CTRL2   0x44
  29 #define USB3_SSPHY_STATUS  0x4c
  30 #define USB2_PHY_CTRL1     0x50
  31 #define USB2_PHY_CTRL2     0x54
  32 #define USB2_PHY_STATUS    0x5c
  33
  34 /* Register bits definition */
  35
  36 /* USB3_CORE_CTRL1 */
  37 #define SW_RESET_MASK   GENMASK(31, 26)
  38 #define PWR_SW_RESET    BIT(31)
  39 #define APB_SW_RESET    BIT(30)
  40 #define AXI_SW_RESET    BIT(29)
  41 #define RW_SW_RESET     BIT(28)
  42 #define PHY_SW_RESET    BIT(27)
  43 #define PHYAHB_SW_RESET BIT(26)
  44 #define ALL_SW_RESET    (PWR_SW_RESET | APB_SW_RESET | AXI_SW_RESET | \
  45                 RW_SW_RESET | PHY_SW_RESET | PHYAHB_SW_RESET)
  46 #define OC_DISABLE      BIT(9)
  47 #define MDCTRL_CLK_SEL  BIT(7)
  48 #define MODE_STRAP_MASK (0x7)
  49 #define DEV_MODE        (1 << 2)
  50 #define HOST_MODE       (1 << 1)
  51 #define OTG_MODE        (1 << 0)
  52
  53 /* USB3_INT_REG */
  54 #define CLK_125_REQ     BIT(29)
  55 #define LPM_CLK_REQ     BIT(28)
  56 #define DEVU3_WAEKUP_EN BIT(14)
  57 #define OTG_WAKEUP_EN   BIT(12)
  58 #define DEV_INT_EN      (3 << 8) /* DEV INT b9:8 */
  59 #define HOST_INT1_EN    (1 << 0) /* HOST INT b7:0 */
  60
  61 /* USB3_CORE_STATUS */
  62 #define MDCTRL_CLK_STATUS       BIT(15)
  63 #define DEV_POWER_ON_READY      BIT(13)
  64 #define HOST_POWER_ON_READY     BIT(12)
  65
  66 /* USB3_SSPHY_STATUS */
  67 #define CLK_VALID_MASK          (0x3f << 26)
  68 #define CLK_VALID_COMPARE_BITS  (0xf << 28)
  69 #define PHY_REFCLK_REQ          (1 << 0)
  70
  71 /* OTG registers definition */
  72 #define OTGSTS          0x4
  73 /* OTGSTS */
  74 #define OTG_NRDY        BIT(11)
  75
  76 /* xHCI registers definition  */
  77 #define XECP_PM_PMCSR           0x8018
  78 #define XECP_AUX_CTRL_REG1      0x8120
  79
  80 /* Register bits definition */
  81 /* XECP_AUX_CTRL_REG1 */
  82 #define CFG_RXDET_P3_EN         BIT(15)
  83
  84 /* XECP_PM_PMCSR */
  85 #define PS_MASK                 GENMASK(1, 0)
  86 #define PS_D0                   0
  87 #define PS_D1                   1
  88
  89 struct cdns_imx {
  90         struct device *dev;
  91         void __iomem *noncore;
  92         struct clk_bulk_data *clks;
  93         int num_clks;
  94         struct platform_device *cdns3_pdev;
  95 };
  96
  97 static inline u32 cdns_imx_readl(struct cdns_imx *data, u32 offset)
  98 {
  99         return readl(data->noncore + offset);
 100 }
 101
 102 static inline void cdns_imx_writel(struct cdns_imx *data, u32 offset, u32 value)
 103 {
 104         writel(value, data->noncore + offset);
 105 }
 106
 107 static const struct clk_bulk_data imx_cdns3_core_clks[] = {
 108         { .id = "usb3_lpm_clk" },
 109         { .id = "usb3_bus_clk" },
 110         { .id = "usb3_aclk" },
 111         { .id = "usb3_ipg_clk" },
 112         { .id = "usb3_core_pclk" },
 113 };
 114
 115 static int cdns_imx_noncore_init(struct cdns_imx *data)
 116 {
 117         u32 value;
 118         int ret;
 119         struct device *dev = data->dev;
 120
 121         cdns_imx_writel(data, USB3_SSPHY_STATUS, CLK_VALID_MASK);
 122         udelay(1);
 123         ret = readl_poll_timeout(data->noncore + USB3_SSPHY_STATUS, value,
 124                 (value & CLK_VALID_COMPARE_BITS) == CLK_VALID_COMPARE_BITS,
 125                 10, 100000);
 126         if (ret) {
 127                 dev_err(dev, "wait clkvld timeout\n");
 128                 return ret;
 129         }
 130
 131         value = cdns_imx_readl(data, USB3_CORE_CTRL1);
 132         value |= ALL_SW_RESET;
 133         cdns_imx_writel(data, USB3_CORE_CTRL1, value);
 134         udelay(1);
 135
 136         value = cdns_imx_readl(data, USB3_CORE_CTRL1);
 137         value = (value & ~MODE_STRAP_MASK) | OTG_MODE | OC_DISABLE;
 138         cdns_imx_writel(data, USB3_CORE_CTRL1, value);
 139
 140         value = cdns_imx_readl(data, USB3_INT_REG);
 141         value |= HOST_INT1_EN | DEV_INT_EN;
 142         cdns_imx_writel(data, USB3_INT_REG, value);
 143
 144         value = cdns_imx_readl(data, USB3_CORE_CTRL1);
 145         value &= ~ALL_SW_RESET;
 146         cdns_imx_writel(data, USB3_CORE_CTRL1, value);
 147         return ret;
 148 }
 149
 150 static int cdns_imx_platform_suspend(struct device *dev,
 151         bool suspend, bool wakeup);
 152 static struct cdns3_platform_data cdns_imx_pdata = {
 153         .platform_suspend = cdns_imx_platform_suspend,
 154         .quirks           = CDNS3_DEFAULT_PM_RUNTIME_ALLOW,
 155 };
 156
 157 static const struct of_dev_auxdata cdns_imx_auxdata[] = {
 158         {
 159                 .compatible = "cdns,usb3",
 160                 .platform_data = &cdns_imx_pdata,
 161         },
 162         {},
 163 };
 164
 165 static int cdns_imx_probe(struct platform_device *pdev)
 166 {
 167         struct device *dev = &pdev->dev;
 168         struct device_node *node = dev->of_node;
 169         struct cdns_imx *data;
 170         int ret;
 171
 172         if (!node)
 173                 return -ENODEV;
 174
 175         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 176         if (!data)
 177                 return -ENOMEM;
 178
 179         platform_set_drvdata(pdev, data);
 180         data->dev = dev;
 181         data->noncore = devm_platform_ioremap_resource(pdev, 0);
 182         if (IS_ERR(data->noncore)) {
 183                 dev_err(dev, "can't map IOMEM resource\n");
 184                 return PTR_ERR(data->noncore);
 185         }
 186
 187         data->num_clks = ARRAY_SIZE(imx_cdns3_core_clks);
 188         data->clks = (struct clk_bulk_data *)imx_cdns3_core_clks;
 189         ret = devm_clk_bulk_get(dev, data->num_clks, data->clks);
 190         if (ret)
 191                 return ret;
 192
 193         ret = clk_bulk_prepare_enable(data->num_clks, data->clks);
 194         if (ret)
 195                 return ret;
 196
 197         ret = cdns_imx_noncore_init(data);
 198         if (ret)
 199                 goto err;
 200
 201         ret = of_platform_populate(node, NULL, cdns_imx_auxdata, dev);
 202         if (ret) {
 203                 dev_err(dev, "failed to create children: %d\n", ret);
 204                 goto err;
 205         }
 206
 207         device_set_wakeup_capable(dev, true);
 208         pm_runtime_set_active(dev);
 209         pm_runtime_enable(dev);
 210
 211         return ret;
 212 err:
 213         clk_bulk_disable_unprepare(data->num_clks, data->clks);
 214         return ret;
 215 }
 216
 217 static int cdns_imx_remove_core(struct device *dev, void *data)
 218 {
 219         struct platform_device *pdev = to_platform_device(dev);
 220
 221         platform_device_unregister(pdev);
 222
 223         return 0;
 224 }
 225
 226 static int cdns_imx_remove(struct platform_device *pdev)
 227 {
 228         struct device *dev = &pdev->dev;
 229
 230         device_for_each_child(dev, NULL, cdns_imx_remove_core);
 231         platform_set_drvdata(pdev, NULL);
 232
 233         return 0;
 234 }
 235
 236 #ifdef CONFIG_PM
 237 static void cdns3_set_wakeup(struct cdns_imx *data, bool enable)
 238 {
 239         u32 value;
 240
 241         value = cdns_imx_readl(data, USB3_INT_REG);
 242         if (enable)
 243                 value |= OTG_WAKEUP_EN | DEVU3_WAEKUP_EN;
 244         else
 245                 value &= ~(OTG_WAKEUP_EN | DEVU3_WAEKUP_EN);
 246
 247         cdns_imx_writel(data, USB3_INT_REG, value);
 248 }
 249
 250 static int cdns_imx_platform_suspend(struct device *dev,
 251                 bool suspend, bool wakeup)
 252 {
 253         struct cdns3 *cdns = dev_get_drvdata(dev);
 254         struct device *parent = dev->parent;
 255         struct cdns_imx *data = dev_get_drvdata(parent);
 256         void __iomem *otg_regs = (void __iomem *)(cdns->otg_regs);
 257         void __iomem *xhci_regs = cdns->xhci_regs;
 258         u32 value;
 259         int ret = 0;
 260
 261         if (cdns->role != USB_ROLE_HOST)
 262                 return 0;
 263
 264         if (suspend) {
 265                 /* SW request low power when all usb ports allow to it ??? */
 266                 value = readl(xhci_regs + XECP_PM_PMCSR);
 267                 value &= ~PS_MASK;
 268                 value |= PS_D1;
 269                 writel(value, xhci_regs + XECP_PM_PMCSR);
 270
 271                 /* mdctrl_clk_sel */
 272                 value = cdns_imx_readl(data, USB3_CORE_CTRL1);
 273                 value |= MDCTRL_CLK_SEL;
 274                 cdns_imx_writel(data, USB3_CORE_CTRL1, value);
 275
 276                 /* wait for mdctrl_clk_status */
 277                 value = cdns_imx_readl(data, USB3_CORE_STATUS);
 278                 ret = readl_poll_timeout(data->noncore + USB3_CORE_STATUS, value,
 279                         (value & MDCTRL_CLK_STATUS) == MDCTRL_CLK_STATUS,
 280                         10, 100000);
 281                 if (ret)
 282                         dev_warn(parent, "wait mdctrl_clk_status timeout\n");
 283
 284                 /* wait lpm_clk_req to be 0 */
 285                 value = cdns_imx_readl(data, USB3_INT_REG);
 286                 ret = readl_poll_timeout(data->noncore + USB3_INT_REG, value,
 287                         (value & LPM_CLK_REQ) != LPM_CLK_REQ,
 288                         10, 100000);
 289                 if (ret)
 290                         dev_warn(parent, "wait lpm_clk_req timeout\n");
 291
 292                 /* wait phy_refclk_req to be 0 */
 293                 value = cdns_imx_readl(data, USB3_SSPHY_STATUS);
 294                 ret = readl_poll_timeout(data->noncore + USB3_SSPHY_STATUS, value,
 295                         (value & PHY_REFCLK_REQ) != PHY_REFCLK_REQ,
 296                         10, 100000);
 297                 if (ret)
 298                         dev_warn(parent, "wait phy_refclk_req timeout\n");
 299
 300                 cdns3_set_wakeup(data, wakeup);
 301         } else {
 302                 cdns3_set_wakeup(data, false);
 303
 304                 /* SW request D0 */
 305                 value = readl(xhci_regs + XECP_PM_PMCSR);
 306                 value &= ~PS_MASK;
 307                 value |= PS_D0;
 308                 writel(value, xhci_regs + XECP_PM_PMCSR);
 309
 310                 /* clr CFG_RXDET_P3_EN */
 311                 value = readl(xhci_regs + XECP_AUX_CTRL_REG1);
 312                 value &= ~CFG_RXDET_P3_EN;
 313                 writel(value, xhci_regs + XECP_AUX_CTRL_REG1);
 314
 315                 /* clear mdctrl_clk_sel */
 316                 value = cdns_imx_readl(data, USB3_CORE_CTRL1);
 317                 value &= ~MDCTRL_CLK_SEL;
 318                 cdns_imx_writel(data, USB3_CORE_CTRL1, value);
 319
 320                 /* wait CLK_125_REQ to be 1 */
 321                 value = cdns_imx_readl(data, USB3_INT_REG);
 322                 ret = readl_poll_timeout(data->noncore + USB3_INT_REG, value,
 323                         (value & CLK_125_REQ) == CLK_125_REQ,
 324                         10, 100000);
 325                 if (ret)
 326                         dev_warn(parent, "wait CLK_125_REQ timeout\n");
 327
 328                 /* wait for mdctrl_clk_status is cleared */
 329                 value = cdns_imx_readl(data, USB3_CORE_STATUS);
 330                 ret = readl_poll_timeout(data->noncore + USB3_CORE_STATUS, value,
 331                         (value & MDCTRL_CLK_STATUS) != MDCTRL_CLK_STATUS,
 332                         10, 100000);
 333                 if (ret)
 334                         dev_warn(parent, "wait mdctrl_clk_status cleared timeout\n");
 335
 336                 /* Wait until OTG_NRDY is 0 */
 337                 value = readl(otg_regs + OTGSTS);
 338                 ret = readl_poll_timeout(otg_regs + OTGSTS, value,
 339                         (value & OTG_NRDY) != OTG_NRDY,
 340                         10, 100000);
 341                 if (ret)
 342                         dev_warn(parent, "wait OTG ready timeout\n");
 343         }
 344
 345         return ret;
 346
 347 }
 348
 349 static int cdns_imx_resume(struct device *dev)
 350 {
 351         struct cdns_imx *data = dev_get_drvdata(dev);
 352
 353         return clk_bulk_prepare_enable(data->num_clks, data->clks);
 354 }
 355
 356 static int cdns_imx_suspend(struct device *dev)
 357 {
 358         struct cdns_imx *data = dev_get_drvdata(dev);
 359
 360         clk_bulk_disable_unprepare(data->num_clks, data->clks);
 361
 362         return 0;
 363 }
 364 #else
 365 static int cdns_imx_platform_suspend(struct device *dev,
 366         bool suspend, bool wakeup)
 367 {
 368         return 0;
 369 }
 370
 371 #endif /* CONFIG_PM */
 372
 373 static const struct dev_pm_ops cdns_imx_pm_ops = {
 374         SET_RUNTIME_PM_OPS(cdns_imx_suspend, cdns_imx_resume, NULL)
 375 };
 376
 377 static const struct of_device_id cdns_imx_of_match[] = {
 378         { .compatible = "fsl,imx8qm-usb3", },
 379         {},
 380 };
 381 MODULE_DEVICE_TABLE(of, cdns_imx_of_match);
 382
 383 static struct platform_driver cdns_imx_driver = {
 384         .probe          = cdns_imx_probe,
 385         .remove         = cdns_imx_remove,
 386         .driver         = {
 387                 .name   = "cdns3-imx",
 388                 .of_match_table = cdns_imx_of_match,
 389                 .pm     = &cdns_imx_pm_ops,
 390         },
 391 };
 392 module_platform_driver(cdns_imx_driver);
 393
 394 MODULE_ALIAS("platform:cdns3-imx");
 395 MODULE_AUTHOR("Peter Chen <peter.chen@nxp.com>");
 396 MODULE_LICENSE("GPL v2");
 397 MODULE_DESCRIPTION("Cadence USB3 i.MX Glue Layer");