drivers/usb/host/ehci-orion.c

   1 /*
   2  * drivers/usb/host/ehci-orion.c
   3  *
   4  * Tzachi Perelstein <[email protected]>
   5  *
   6  * This file is licensed under  the terms of the GNU General Public
   7  * License version 2. This program is licensed "as is" without any
   8  * warranty of any kind, whether express or implied.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/mbus.h>
  15 #include <linux/clk.h>
  16 #include <linux/platform_data/usb-ehci-orion.h>
  17 #include <linux/of.h>
  18 #include <linux/of_device.h>
  19 #include <linux/of_irq.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/hcd.h>
  22 #include <linux/io.h>
  23 #include <linux/dma-mapping.h>
  24
  25 #include "ehci.h"
  26
  27 #define rdl(off)        __raw_readl(hcd->regs + (off))
  28 #define wrl(off, val)   __raw_writel((val), hcd->regs + (off))
  29
  30 #define USB_CMD                 0x140
  31 #define USB_MODE                0x1a8
  32 #define USB_CAUSE               0x310
  33 #define USB_MASK                0x314
  34 #define USB_WINDOW_CTRL(i)      (0x320 + ((i) << 4))
  35 #define USB_WINDOW_BASE(i)      (0x324 + ((i) << 4))
  36 #define USB_IPG                 0x360
  37 #define USB_PHY_PWR_CTRL        0x400
  38 #define USB_PHY_TX_CTRL         0x420
  39 #define USB_PHY_RX_CTRL         0x430
  40 #define USB_PHY_IVREF_CTRL      0x440
  41 #define USB_PHY_TST_GRP_CTRL    0x450
  42
  43 #define DRIVER_DESC "EHCI orion driver"
  44
  45 static const char hcd_name[] = "ehci-orion";
  46
  47 static struct hc_driver __read_mostly ehci_orion_hc_driver;
  48
  49 /*
  50  * Implement Orion USB controller specification guidelines
  51  */
  52 static void orion_usb_phy_v1_setup(struct usb_hcd *hcd)
  53 {
  54         /* The below GLs are according to the Orion Errata document */
  55         /*
  56          * Clear interrupt cause and mask
  57          */
  58         wrl(USB_CAUSE, 0);
  59         wrl(USB_MASK, 0);
  60
  61         /*
  62          * Reset controller
  63          */
  64         wrl(USB_CMD, rdl(USB_CMD) | 0x2);
  65         while (rdl(USB_CMD) & 0x2);
  66
  67         /*
  68          * GL# USB-10: Set IPG for non start of frame packets
  69          * Bits[14:8]=0xc
  70          */
  71         wrl(USB_IPG, (rdl(USB_IPG) & ~0x7f00) | 0xc00);
  72
  73         /*
  74          * GL# USB-9: USB 2.0 Power Control
  75          * BG_VSEL[7:6]=0x1
  76          */
  77         wrl(USB_PHY_PWR_CTRL, (rdl(USB_PHY_PWR_CTRL) & ~0xc0)| 0x40);
  78
  79         /*
  80          * GL# USB-1: USB PHY Tx Control - force calibration to '8'
  81          * TXDATA_BLOCK_EN[21]=0x1, EXT_RCAL_EN[13]=0x1, IMP_CAL[6:3]=0x8
  82          */
  83         wrl(USB_PHY_TX_CTRL, (rdl(USB_PHY_TX_CTRL) & ~0x78) | 0x202040);
  84
  85         /*
  86          * GL# USB-3 GL# USB-9: USB PHY Rx Control
  87          * RXDATA_BLOCK_LENGHT[31:30]=0x3, EDGE_DET_SEL[27:26]=0,
  88          * CDR_FASTLOCK_EN[21]=0, DISCON_THRESHOLD[9:8]=0, SQ_THRESH[7:4]=0x1
  89          */
  90         wrl(USB_PHY_RX_CTRL, (rdl(USB_PHY_RX_CTRL) & ~0xc2003f0) | 0xc0000010);
  91
  92         /*
  93          * GL# USB-3 GL# USB-9: USB PHY IVREF Control
  94          * PLLVDD12[1:0]=0x2, RXVDD[5:4]=0x3, Reserved[19]=0
  95          */
  96         wrl(USB_PHY_IVREF_CTRL, (rdl(USB_PHY_IVREF_CTRL) & ~0x80003 ) | 0x32);
  97
  98         /*
  99          * GL# USB-3 GL# USB-9: USB PHY Test Group Control
 100          * REG_FIFO_SQ_RST[15]=0
 101          */
 102         wrl(USB_PHY_TST_GRP_CTRL, rdl(USB_PHY_TST_GRP_CTRL) & ~0x8000);
 103
 104         /*
 105          * Stop and reset controller
 106          */
 107         wrl(USB_CMD, rdl(USB_CMD) & ~0x1);
 108         wrl(USB_CMD, rdl(USB_CMD) | 0x2);
 109         while (rdl(USB_CMD) & 0x2);
 110
 111         /*
 112          * GL# USB-5 Streaming disable REG_USB_MODE[4]=1
 113          * TBD: This need to be done after each reset!
 114          * GL# USB-4 Setup USB Host mode
 115          */
 116         wrl(USB_MODE, 0x13);
 117 }
 118
 119 static void
 120 ehci_orion_conf_mbus_windows(struct usb_hcd *hcd,
 121                              const struct mbus_dram_target_info *dram)
 122 {
 123         int i;
 124
 125         for (i = 0; i < 4; i++) {
 126                 wrl(USB_WINDOW_CTRL(i), 0);
 127                 wrl(USB_WINDOW_BASE(i), 0);
 128         }
 129
 130         for (i = 0; i < dram->num_cs; i++) {
 131                 const struct mbus_dram_window *cs = dram->cs + i;
 132
 133                 wrl(USB_WINDOW_CTRL(i), ((cs->size - 1) & 0xffff0000) |
 134                                         (cs->mbus_attr << 8) |
 135                                         (dram->mbus_dram_target_id << 4) | 1);
 136                 wrl(USB_WINDOW_BASE(i), cs->base);
 137         }
 138 }
 139
 140 static int ehci_orion_drv_probe(struct platform_device *pdev)
 141 {
 142         struct orion_ehci_data *pd = dev_get_platdata(&pdev->dev);
 143         const struct mbus_dram_target_info *dram;
 144         struct resource *res;
 145         struct usb_hcd *hcd;
 146         struct ehci_hcd *ehci;
 147         struct clk *clk;
 148         void __iomem *regs;
 149         int irq, err;
 150         enum orion_ehci_phy_ver phy_version;
 151
 152         if (usb_disabled())
 153                 return -ENODEV;
 154
 155         pr_debug("Initializing Orion-SoC USB Host Controller\n");
 156
 157         if (pdev->dev.of_node)
 158                 irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
 159         else
 160                 irq = platform_get_irq(pdev, 0);
 161         if (irq <= 0) {
 162                 dev_err(&pdev->dev,
 163                         "Found HC with no IRQ. Check %s setup!\n",
 164                         dev_name(&pdev->dev));
 165                 err = -ENODEV;
 166                 goto err1;
 167         }
 168
 169         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 170         if (!res) {
 171                 dev_err(&pdev->dev,
 172                         "Found HC with no register addr. Check %s setup!\n",
 173                         dev_name(&pdev->dev));
 174                 err = -ENODEV;
 175                 goto err1;
 176         }
 177
 178         /*
 179          * Right now device-tree probed devices don't get dma_mask
 180          * set. Since shared usb code relies on it, set it here for
 181          * now. Once we have dma capability bindings this can go away.
 182          */
 183         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 184         if (err)
 185                 goto err1;
 186
 187         regs = devm_ioremap_resource(&pdev->dev, res);
 188         if (IS_ERR(regs)) {
 189                 err = PTR_ERR(regs);
 190                 goto err1;
 191         }
 192
 193         /* Not all platforms can gate the clock, so it is not
 194            an error if the clock does not exists. */
 195         clk = devm_clk_get(&pdev->dev, NULL);
 196         if (!IS_ERR(clk))
 197                 clk_prepare_enable(clk);
 198
 199         hcd = usb_create_hcd(&ehci_orion_hc_driver,
 200                         &pdev->dev, dev_name(&pdev->dev));
 201         if (!hcd) {
 202                 err = -ENOMEM;
 203                 goto err2;
 204         }
 205
 206         hcd->rsrc_start = res->start;
 207         hcd->rsrc_len = resource_size(res);
 208         hcd->regs = regs;
 209
 210         ehci = hcd_to_ehci(hcd);
 211         ehci->caps = hcd->regs + 0x100;
 212         hcd->has_tt = 1;
 213
 214         /*
 215          * (Re-)program MBUS remapping windows if we are asked to.
 216          */
 217         dram = mv_mbus_dram_info();
 218         if (dram)
 219                 ehci_orion_conf_mbus_windows(hcd, dram);
 220
 221         /*
 222          * setup Orion USB controller.
 223          */
 224         if (pdev->dev.of_node)
 225                 phy_version = EHCI_PHY_NA;
 226         else
 227                 phy_version = pd->phy_version;
 228
 229         switch (phy_version) {
 230         case EHCI_PHY_NA:       /* dont change USB phy settings */
 231                 break;
 232         case EHCI_PHY_ORION:
 233                 orion_usb_phy_v1_setup(hcd);
 234                 break;
 235         case EHCI_PHY_DD:
 236         case EHCI_PHY_KW:
 237         default:
 238                 dev_warn(&pdev->dev, "USB phy version isn't supported.\n");
 239         }
 240
 241         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 242         if (err)
 243                 goto err3;
 244
 245         device_wakeup_enable(hcd->self.controller);
 246         return 0;
 247
 248 err3:
 249         usb_put_hcd(hcd);
 250 err2:
 251         if (!IS_ERR(clk))
 252                 clk_disable_unprepare(clk);
 253 err1:
 254         dev_err(&pdev->dev, "init %s fail, %d\n",
 255                 dev_name(&pdev->dev), err);
 256
 257         return err;
 258 }
 259
 260 static int ehci_orion_drv_remove(struct platform_device *pdev)
 261 {
 262         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 263         struct clk *clk;
 264
 265         usb_remove_hcd(hcd);
 266         usb_put_hcd(hcd);
 267
 268         clk = devm_clk_get(&pdev->dev, NULL);
 269         if (!IS_ERR(clk))
 270                 clk_disable_unprepare(clk);
 271         return 0;
 272 }
 273
 274 static const struct of_device_id ehci_orion_dt_ids[] = {
 275         { .compatible = "marvell,orion-ehci", },
 276         {},
 277 };
 278 MODULE_DEVICE_TABLE(of, ehci_orion_dt_ids);
 279
 280 static struct platform_driver ehci_orion_driver = {
 281         .probe          = ehci_orion_drv_probe,
 282         .remove         = ehci_orion_drv_remove,
 283         .shutdown       = usb_hcd_platform_shutdown,
 284         .driver = {
 285                 .name   = "orion-ehci",
 286                 .owner  = THIS_MODULE,
 287                 .of_match_table = ehci_orion_dt_ids,
 288         },
 289 };
 290
 291 static int __init ehci_orion_init(void)
 292 {
 293         if (usb_disabled())
 294                 return -ENODEV;
 295
 296         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 297
 298         ehci_init_driver(&ehci_orion_hc_driver, NULL);
 299         return platform_driver_register(&ehci_orion_driver);
 300 }
 301 module_init(ehci_orion_init);
 302
 303 static void __exit ehci_orion_cleanup(void)
 304 {
 305         platform_driver_unregister(&ehci_orion_driver);
 306 }
 307 module_exit(ehci_orion_cleanup);
 308
 309 MODULE_DESCRIPTION(DRIVER_DESC);
 310 MODULE_ALIAS("platform:orion-ehci");
 311 MODULE_AUTHOR("Tzachi Perelstein");
 312 MODULE_LICENSE("GPL v2");