drivers/usb/host/ehci-orion.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * drivers/usb/host/ehci-orion.c
   4  *
   5  * Tzachi Perelstein <tzachi@marvell.com>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/mbus.h>
  12 #include <linux/clk.h>
  13 #include <linux/platform_data/usb-ehci-orion.h>
  14 #include <linux/of.h>
  15 #include <linux/phy/phy.h>
  16 #include <linux/of_device.h>
  17 #include <linux/of_irq.h>
  18 #include <linux/usb.h>
  19 #include <linux/usb/hcd.h>
  20 #include <linux/io.h>
  21 #include <linux/dma-mapping.h>
  22
  23 #include "ehci.h"
  24
  25 #define rdl(off)        readl_relaxed(hcd->regs + (off))
  26 #define wrl(off, val)   writel_relaxed((val), hcd->regs + (off))
  27
  28 #define USB_CMD                 0x140
  29 #define   USB_CMD_RUN           BIT(0)
  30 #define   USB_CMD_RESET         BIT(1)
  31 #define USB_MODE                0x1a8
  32 #define   USB_MODE_MASK         GENMASK(1, 0)
  33 #define   USB_MODE_DEVICE       0x2
  34 #define   USB_MODE_HOST         0x3
  35 #define   USB_MODE_SDIS         BIT(4)
  36 #define USB_CAUSE               0x310
  37 #define USB_MASK                0x314
  38 #define USB_WINDOW_CTRL(i)      (0x320 + ((i) << 4))
  39 #define USB_WINDOW_BASE(i)      (0x324 + ((i) << 4))
  40 #define USB_IPG                 0x360
  41 #define USB_PHY_PWR_CTRL        0x400
  42 #define USB_PHY_TX_CTRL         0x420
  43 #define USB_PHY_RX_CTRL         0x430
  44 #define USB_PHY_IVREF_CTRL      0x440
  45 #define USB_PHY_TST_GRP_CTRL    0x450
  46
  47 #define USB_SBUSCFG             0x90
  48
  49 /* BAWR = BARD = 3 : Align read/write bursts packets larger than 128 bytes */
  50 #define USB_SBUSCFG_BAWR_ALIGN_128B     (0x3 << 6)
  51 #define USB_SBUSCFG_BARD_ALIGN_128B     (0x3 << 3)
  52 /* AHBBRST = 3     : Align AHB Burst to INCR16 (64 bytes) */
  53 #define USB_SBUSCFG_AHBBRST_INCR16      (0x3 << 0)
  54
  55 #define USB_SBUSCFG_DEF_VAL (USB_SBUSCFG_BAWR_ALIGN_128B        \
  56                              | USB_SBUSCFG_BARD_ALIGN_128B      \
  57                              | USB_SBUSCFG_AHBBRST_INCR16)
  58
  59 #define DRIVER_DESC "EHCI orion driver"
  60
  61 #define hcd_to_orion_priv(h) ((struct orion_ehci_hcd *)hcd_to_ehci(h)->priv)
  62
  63 struct orion_ehci_hcd {
  64         struct clk *clk;
  65         struct phy *phy;
  66 };
  67
  68 static const char hcd_name[] = "ehci-orion";
  69
  70 static struct hc_driver __read_mostly ehci_orion_hc_driver;
  71
  72 /*
  73  * Implement Orion USB controller specification guidelines
  74  */
  75 static void orion_usb_phy_v1_setup(struct usb_hcd *hcd)
  76 {
  77         /* The below GLs are according to the Orion Errata document */
  78         /*
  79          * Clear interrupt cause and mask
  80          */
  81         wrl(USB_CAUSE, 0);
  82         wrl(USB_MASK, 0);
  83
  84         /*
  85          * Reset controller
  86          */
  87         wrl(USB_CMD, rdl(USB_CMD) | USB_CMD_RESET);
  88         while (rdl(USB_CMD) & USB_CMD_RESET);
  89
  90         /*
  91          * GL# USB-10: Set IPG for non start of frame packets
  92          * Bits[14:8]=0xc
  93          */
  94         wrl(USB_IPG, (rdl(USB_IPG) & ~0x7f00) | 0xc00);
  95
  96         /*
  97          * GL# USB-9: USB 2.0 Power Control
  98          * BG_VSEL[7:6]=0x1
  99          */
 100         wrl(USB_PHY_PWR_CTRL, (rdl(USB_PHY_PWR_CTRL) & ~0xc0)| 0x40);
 101
 102         /*
 103          * GL# USB-1: USB PHY Tx Control - force calibration to '8'
 104          * TXDATA_BLOCK_EN[21]=0x1, EXT_RCAL_EN[13]=0x1, IMP_CAL[6:3]=0x8
 105          */
 106         wrl(USB_PHY_TX_CTRL, (rdl(USB_PHY_TX_CTRL) & ~0x78) | 0x202040);
 107
 108         /*
 109          * GL# USB-3 GL# USB-9: USB PHY Rx Control
 110          * RXDATA_BLOCK_LENGHT[31:30]=0x3, EDGE_DET_SEL[27:26]=0,
 111          * CDR_FASTLOCK_EN[21]=0, DISCON_THRESHOLD[9:8]=0, SQ_THRESH[7:4]=0x1
 112          */
 113         wrl(USB_PHY_RX_CTRL, (rdl(USB_PHY_RX_CTRL) & ~0xc2003f0) | 0xc0000010);
 114
 115         /*
 116          * GL# USB-3 GL# USB-9: USB PHY IVREF Control
 117          * PLLVDD12[1:0]=0x2, RXVDD[5:4]=0x3, Reserved[19]=0
 118          */
 119         wrl(USB_PHY_IVREF_CTRL, (rdl(USB_PHY_IVREF_CTRL) & ~0x80003 ) | 0x32);
 120
 121         /*
 122          * GL# USB-3 GL# USB-9: USB PHY Test Group Control
 123          * REG_FIFO_SQ_RST[15]=0
 124          */
 125         wrl(USB_PHY_TST_GRP_CTRL, rdl(USB_PHY_TST_GRP_CTRL) & ~0x8000);
 126
 127         /*
 128          * Stop and reset controller
 129          */
 130         wrl(USB_CMD, rdl(USB_CMD) & ~USB_CMD_RUN);
 131         wrl(USB_CMD, rdl(USB_CMD) | USB_CMD_RESET);
 132         while (rdl(USB_CMD) & USB_CMD_RESET);
 133
 134         /*
 135          * GL# USB-5 Streaming disable REG_USB_MODE[4]=1
 136          * TBD: This need to be done after each reset!
 137          * GL# USB-4 Setup USB Host mode
 138          */
 139         wrl(USB_MODE, USB_MODE_SDIS | USB_MODE_HOST);
 140 }
 141
 142 static void
 143 ehci_orion_conf_mbus_windows(struct usb_hcd *hcd,
 144                              const struct mbus_dram_target_info *dram)
 145 {
 146         int i;
 147
 148         for (i = 0; i < 4; i++) {
 149                 wrl(USB_WINDOW_CTRL(i), 0);
 150                 wrl(USB_WINDOW_BASE(i), 0);
 151         }
 152
 153         for (i = 0; i < dram->num_cs; i++) {
 154                 const struct mbus_dram_window *cs = dram->cs + i;
 155
 156                 wrl(USB_WINDOW_CTRL(i), ((cs->size - 1) & 0xffff0000) |
 157                                         (cs->mbus_attr << 8) |
 158                                         (dram->mbus_dram_target_id << 4) | 1);
 159                 wrl(USB_WINDOW_BASE(i), cs->base);
 160         }
 161 }
 162
 163 static int ehci_orion_drv_reset(struct usb_hcd *hcd)
 164 {
 165         struct device *dev = hcd->self.controller;
 166         int ret;
 167
 168         ret = ehci_setup(hcd);
 169         if (ret)
 170                 return ret;
 171
 172         /*
 173          * For SoC without hlock, need to program sbuscfg value to guarantee
 174          * AHB master's burst would not overrun or underrun FIFO.
 175          *
 176          * sbuscfg reg has to be set after usb controller reset, otherwise
 177          * the value would be override to 0.
 178          */
 179         if (of_device_is_compatible(dev->of_node, "marvell,armada-3700-ehci"))
 180                 wrl(USB_SBUSCFG, USB_SBUSCFG_DEF_VAL);
 181
 182         return ret;
 183 }
 184
 185 static int __maybe_unused ehci_orion_drv_suspend(struct device *dev)
 186 {
 187         struct usb_hcd *hcd = dev_get_drvdata(dev);
 188
 189         return ehci_suspend(hcd, device_may_wakeup(dev));
 190 }
 191
 192 static int __maybe_unused ehci_orion_drv_resume(struct device *dev)
 193 {
 194         struct usb_hcd *hcd = dev_get_drvdata(dev);
 195
 196         return ehci_resume(hcd, false);
 197 }
 198
 199 static SIMPLE_DEV_PM_OPS(ehci_orion_pm_ops, ehci_orion_drv_suspend,
 200                          ehci_orion_drv_resume);
 201
 202 static const struct ehci_driver_overrides orion_overrides __initconst = {
 203         .extra_priv_size =      sizeof(struct orion_ehci_hcd),
 204         .reset = ehci_orion_drv_reset,
 205 };
 206
 207 static int ehci_orion_drv_probe(struct platform_device *pdev)
 208 {
 209         struct orion_ehci_data *pd = dev_get_platdata(&pdev->dev);
 210         const struct mbus_dram_target_info *dram;
 211         struct resource *res;
 212         struct usb_hcd *hcd;
 213         struct ehci_hcd *ehci;
 214         void __iomem *regs;
 215         int irq, err;
 216         enum orion_ehci_phy_ver phy_version;
 217         struct orion_ehci_hcd *priv;
 218
 219         if (usb_disabled())
 220                 return -ENODEV;
 221
 222         pr_debug("Initializing Orion-SoC USB Host Controller\n");
 223
 224         irq = platform_get_irq(pdev, 0);
 225         if (irq <= 0) {
 226                 err = -ENODEV;
 227                 goto err;
 228         }
 229
 230         /*
 231          * Right now device-tree probed devices don't get dma_mask
 232          * set. Since shared usb code relies on it, set it here for
 233          * now. Once we have dma capability bindings this can go away.
 234          */
 235         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 236         if (err)
 237                 goto err;
 238
 239         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 240         regs = devm_ioremap_resource(&pdev->dev, res);
 241         if (IS_ERR(regs)) {
 242                 err = PTR_ERR(regs);
 243                 goto err;
 244         }
 245
 246         hcd = usb_create_hcd(&ehci_orion_hc_driver,
 247                         &pdev->dev, dev_name(&pdev->dev));
 248         if (!hcd) {
 249                 err = -ENOMEM;
 250                 goto err;
 251         }
 252
 253         hcd->rsrc_start = res->start;
 254         hcd->rsrc_len = resource_size(res);
 255         hcd->regs = regs;
 256
 257         ehci = hcd_to_ehci(hcd);
 258         ehci->caps = hcd->regs + 0x100;
 259         hcd->has_tt = 1;
 260
 261         priv = hcd_to_orion_priv(hcd);
 262         /*
 263          * Not all platforms can gate the clock, so it is not an error if
 264          * the clock does not exists.
 265          */
 266         priv->clk = devm_clk_get(&pdev->dev, NULL);
 267         if (!IS_ERR(priv->clk))
 268                 clk_prepare_enable(priv->clk);
 269
 270         priv->phy = devm_phy_optional_get(&pdev->dev, "usb");
 271         if (IS_ERR(priv->phy)) {
 272                 err = PTR_ERR(priv->phy);
 273                 if (err != -ENOSYS)
 274                         goto err_dis_clk;
 275         }
 276
 277         /*
 278          * (Re-)program MBUS remapping windows if we are asked to.
 279          */
 280         dram = mv_mbus_dram_info();
 281         if (dram)
 282                 ehci_orion_conf_mbus_windows(hcd, dram);
 283
 284         /*
 285          * setup Orion USB controller.
 286          */
 287         if (pdev->dev.of_node)
 288                 phy_version = EHCI_PHY_NA;
 289         else
 290                 phy_version = pd->phy_version;
 291
 292         switch (phy_version) {
 293         case EHCI_PHY_NA:       /* dont change USB phy settings */
 294                 break;
 295         case EHCI_PHY_ORION:
 296                 orion_usb_phy_v1_setup(hcd);
 297                 break;
 298         case EHCI_PHY_DD:
 299         case EHCI_PHY_KW:
 300         default:
 301                 dev_warn(&pdev->dev, "USB phy version isn't supported.\n");
 302         }
 303
 304         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 305         if (err)
 306                 goto err_dis_clk;
 307
 308         device_wakeup_enable(hcd->self.controller);
 309         return 0;
 310
 311 err_dis_clk:
 312         if (!IS_ERR(priv->clk))
 313                 clk_disable_unprepare(priv->clk);
 314         usb_put_hcd(hcd);
 315 err:
 316         dev_err(&pdev->dev, "init %s fail, %d\n",
 317                 dev_name(&pdev->dev), err);
 318
 319         return err;
 320 }
 321
 322 static int ehci_orion_drv_remove(struct platform_device *pdev)
 323 {
 324         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 325         struct orion_ehci_hcd *priv = hcd_to_orion_priv(hcd);
 326
 327         usb_remove_hcd(hcd);
 328
 329         if (!IS_ERR(priv->clk))
 330                 clk_disable_unprepare(priv->clk);
 331
 332         usb_put_hcd(hcd);
 333
 334         return 0;
 335 }
 336
 337 static const struct of_device_id ehci_orion_dt_ids[] = {
 338         { .compatible = "marvell,orion-ehci", },
 339         { .compatible = "marvell,armada-3700-ehci", },
 340         {},
 341 };
 342 MODULE_DEVICE_TABLE(of, ehci_orion_dt_ids);
 343
 344 static struct platform_driver ehci_orion_driver = {
 345         .probe          = ehci_orion_drv_probe,
 346         .remove         = ehci_orion_drv_remove,
 347         .shutdown       = usb_hcd_platform_shutdown,
 348         .driver = {
 349                 .name   = "orion-ehci",
 350                 .of_match_table = ehci_orion_dt_ids,
 351                 .pm = &ehci_orion_pm_ops,
 352         },
 353 };
 354
 355 static int __init ehci_orion_init(void)
 356 {
 357         if (usb_disabled())
 358                 return -ENODEV;
 359
 360         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 361
 362         ehci_init_driver(&ehci_orion_hc_driver, &orion_overrides);
 363         return platform_driver_register(&ehci_orion_driver);
 364 }
 365 module_init(ehci_orion_init);
 366
 367 static void __exit ehci_orion_cleanup(void)
 368 {
 369         platform_driver_unregister(&ehci_orion_driver);
 370 }
 371 module_exit(ehci_orion_cleanup);
 372
 373 MODULE_DESCRIPTION(DRIVER_DESC);
 374 MODULE_ALIAS("platform:orion-ehci");
 375 MODULE_AUTHOR("Tzachi Perelstein");
 376 MODULE_LICENSE("GPL v2");