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 const struct ehci_driver_overrides orion_overrides __initconst = {
 186         .extra_priv_size =      sizeof(struct orion_ehci_hcd),
 187         .reset = ehci_orion_drv_reset,
 188 };
 189
 190 static int ehci_orion_drv_probe(struct platform_device *pdev)
 191 {
 192         struct orion_ehci_data *pd = dev_get_platdata(&pdev->dev);
 193         const struct mbus_dram_target_info *dram;
 194         struct resource *res;
 195         struct usb_hcd *hcd;
 196         struct ehci_hcd *ehci;
 197         void __iomem *regs;
 198         int irq, err;
 199         enum orion_ehci_phy_ver phy_version;
 200         struct orion_ehci_hcd *priv;
 201
 202         if (usb_disabled())
 203                 return -ENODEV;
 204
 205         pr_debug("Initializing Orion-SoC USB Host Controller\n");
 206
 207         irq = platform_get_irq(pdev, 0);
 208         if (irq <= 0) {
 209                 dev_err(&pdev->dev,
 210                         "Found HC with no IRQ. Check %s setup!\n",
 211                         dev_name(&pdev->dev));
 212                 err = -ENODEV;
 213                 goto err;
 214         }
 215
 216         /*
 217          * Right now device-tree probed devices don't get dma_mask
 218          * set. Since shared usb code relies on it, set it here for
 219          * now. Once we have dma capability bindings this can go away.
 220          */
 221         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 222         if (err)
 223                 goto err;
 224
 225         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 226         regs = devm_ioremap_resource(&pdev->dev, res);
 227         if (IS_ERR(regs)) {
 228                 err = PTR_ERR(regs);
 229                 goto err;
 230         }
 231
 232         hcd = usb_create_hcd(&ehci_orion_hc_driver,
 233                         &pdev->dev, dev_name(&pdev->dev));
 234         if (!hcd) {
 235                 err = -ENOMEM;
 236                 goto err;
 237         }
 238
 239         hcd->rsrc_start = res->start;
 240         hcd->rsrc_len = resource_size(res);
 241         hcd->regs = regs;
 242
 243         ehci = hcd_to_ehci(hcd);
 244         ehci->caps = hcd->regs + 0x100;
 245         hcd->has_tt = 1;
 246
 247         priv = hcd_to_orion_priv(hcd);
 248         /*
 249          * Not all platforms can gate the clock, so it is not an error if
 250          * the clock does not exists.
 251          */
 252         priv->clk = devm_clk_get(&pdev->dev, NULL);
 253         if (!IS_ERR(priv->clk))
 254                 clk_prepare_enable(priv->clk);
 255
 256         priv->phy = devm_phy_optional_get(&pdev->dev, "usb");
 257         if (IS_ERR(priv->phy)) {
 258                 err = PTR_ERR(priv->phy);
 259                 if (err != -ENOSYS)
 260                         goto err_phy_get;
 261         } else {
 262                 err = phy_init(priv->phy);
 263                 if (err)
 264                         goto err_phy_init;
 265
 266                 err = phy_power_on(priv->phy);
 267                 if (err)
 268                         goto err_phy_power_on;
 269         }
 270
 271         /*
 272          * (Re-)program MBUS remapping windows if we are asked to.
 273          */
 274         dram = mv_mbus_dram_info();
 275         if (dram)
 276                 ehci_orion_conf_mbus_windows(hcd, dram);
 277
 278         /*
 279          * setup Orion USB controller.
 280          */
 281         if (pdev->dev.of_node)
 282                 phy_version = EHCI_PHY_NA;
 283         else
 284                 phy_version = pd->phy_version;
 285
 286         switch (phy_version) {
 287         case EHCI_PHY_NA:       /* dont change USB phy settings */
 288                 break;
 289         case EHCI_PHY_ORION:
 290                 orion_usb_phy_v1_setup(hcd);
 291                 break;
 292         case EHCI_PHY_DD:
 293         case EHCI_PHY_KW:
 294         default:
 295                 dev_warn(&pdev->dev, "USB phy version isn't supported.\n");
 296         }
 297
 298         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 299         if (err)
 300                 goto err_add_hcd;
 301
 302         device_wakeup_enable(hcd->self.controller);
 303         return 0;
 304
 305 err_add_hcd:
 306         if (!IS_ERR(priv->phy))
 307                 phy_power_off(priv->phy);
 308 err_phy_power_on:
 309         if (!IS_ERR(priv->phy))
 310                 phy_exit(priv->phy);
 311 err_phy_init:
 312 err_phy_get:
 313         if (!IS_ERR(priv->clk))
 314                 clk_disable_unprepare(priv->clk);
 315         usb_put_hcd(hcd);
 316 err:
 317         dev_err(&pdev->dev, "init %s fail, %d\n",
 318                 dev_name(&pdev->dev), err);
 319
 320         return err;
 321 }
 322
 323 static int ehci_orion_drv_remove(struct platform_device *pdev)
 324 {
 325         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 326         struct orion_ehci_hcd *priv = hcd_to_orion_priv(hcd);
 327
 328         usb_remove_hcd(hcd);
 329
 330         if (!IS_ERR(priv->phy)) {
 331                 phy_power_off(priv->phy);
 332                 phy_exit(priv->phy);
 333         }
 334
 335         if (!IS_ERR(priv->clk))
 336                 clk_disable_unprepare(priv->clk);
 337
 338         usb_put_hcd(hcd);
 339
 340         return 0;
 341 }
 342
 343 static const struct of_device_id ehci_orion_dt_ids[] = {
 344         { .compatible = "marvell,orion-ehci", },
 345         { .compatible = "marvell,armada-3700-ehci", },
 346         {},
 347 };
 348 MODULE_DEVICE_TABLE(of, ehci_orion_dt_ids);
 349
 350 static struct platform_driver ehci_orion_driver = {
 351         .probe          = ehci_orion_drv_probe,
 352         .remove         = ehci_orion_drv_remove,
 353         .shutdown       = usb_hcd_platform_shutdown,
 354         .driver = {
 355                 .name   = "orion-ehci",
 356                 .of_match_table = ehci_orion_dt_ids,
 357         },
 358 };
 359
 360 static int __init ehci_orion_init(void)
 361 {
 362         if (usb_disabled())
 363                 return -ENODEV;
 364
 365         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 366
 367         ehci_init_driver(&ehci_orion_hc_driver, &orion_overrides);
 368         return platform_driver_register(&ehci_orion_driver);
 369 }
 370 module_init(ehci_orion_init);
 371
 372 static void __exit ehci_orion_cleanup(void)
 373 {
 374         platform_driver_unregister(&ehci_orion_driver);
 375 }
 376 module_exit(ehci_orion_cleanup);
 377
 378 MODULE_DESCRIPTION(DRIVER_DESC);
 379 MODULE_ALIAS("platform:orion-ehci");
 380 MODULE_AUTHOR("Tzachi Perelstein");
 381 MODULE_LICENSE("GPL v2");