drivers/usb/musb/ux500.c

   1 /*
   2  * Copyright (C) 2010 ST-Ericsson AB
   3  * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
   4  *
   5  * Based on omap2430.c
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/clk.h>
  25 #include <linux/err.h>
  26 #include <linux/io.h>
  27 #include <linux/of.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/usb/musb-ux500.h>
  30
  31 #include "musb_core.h"
  32
  33 static struct musb_hdrc_config ux500_musb_hdrc_config = {
  34         .multipoint     = true,
  35         .dyn_fifo       = true,
  36         .num_eps        = 16,
  37         .ram_bits       = 16,
  38 };
  39
  40 struct ux500_glue {
  41         struct device           *dev;
  42         struct platform_device  *musb;
  43         struct clk              *clk;
  44 };
  45 #define glue_to_musb(g) platform_get_drvdata(g->musb)
  46
  47 static void ux500_musb_set_vbus(struct musb *musb, int is_on)
  48 {
  49         u8            devctl;
  50         unsigned long timeout = jiffies + msecs_to_jiffies(1000);
  51         /* HDRC controls CPEN, but beware current surges during device
  52          * connect.  They can trigger transient overcurrent conditions
  53          * that must be ignored.
  54          */
  55
  56         devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
  57
  58         if (is_on) {
  59                 if (musb->xceiv->otg->state == OTG_STATE_A_IDLE) {
  60                         /* start the session */
  61                         devctl |= MUSB_DEVCTL_SESSION;
  62                         musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
  63                         /*
  64                          * Wait for the musb to set as A device to enable the
  65                          * VBUS
  66                          */
  67                         while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {
  68
  69                                 if (time_after(jiffies, timeout)) {
  70                                         dev_err(musb->controller,
  71                                         "configured as A device timeout");
  72                                         break;
  73                                 }
  74                         }
  75
  76                 } else {
  77                         musb->is_active = 1;
  78                         musb->xceiv->otg->default_a = 1;
  79                         musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
  80                         devctl |= MUSB_DEVCTL_SESSION;
  81                         MUSB_HST_MODE(musb);
  82                 }
  83         } else {
  84                 musb->is_active = 0;
  85
  86                 /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping
  87                  * right to B_IDLE...
  88                  */
  89                 musb->xceiv->otg->default_a = 0;
  90                 devctl &= ~MUSB_DEVCTL_SESSION;
  91                 MUSB_DEV_MODE(musb);
  92         }
  93         musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
  94
  95         /*
  96          * Devctl values will be updated after vbus goes below
  97          * session_valid. The time taken depends on the capacitance
  98          * on VBUS line. The max discharge time can be upto 1 sec
  99          * as per the spec. Typically on our platform, it is 200ms
 100          */
 101         if (!is_on)
 102                 mdelay(200);
 103
 104         dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
 105                 usb_otg_state_string(musb->xceiv->otg->state),
 106                 musb_readb(musb->mregs, MUSB_DEVCTL));
 107 }
 108
 109 static int musb_otg_notifications(struct notifier_block *nb,
 110                 unsigned long event, void *unused)
 111 {
 112         struct musb *musb = container_of(nb, struct musb, nb);
 113
 114         dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n",
 115                         event, usb_otg_state_string(musb->xceiv->otg->state));
 116
 117         switch (event) {
 118         case UX500_MUSB_ID:
 119                 dev_dbg(musb->controller, "ID GND\n");
 120                 ux500_musb_set_vbus(musb, 1);
 121                 break;
 122         case UX500_MUSB_VBUS:
 123                 dev_dbg(musb->controller, "VBUS Connect\n");
 124                 break;
 125         case UX500_MUSB_NONE:
 126                 dev_dbg(musb->controller, "VBUS Disconnect\n");
 127                 if (is_host_active(musb))
 128                         ux500_musb_set_vbus(musb, 0);
 129                 else
 130                         musb->xceiv->otg->state = OTG_STATE_B_IDLE;
 131                 break;
 132         default:
 133                 dev_dbg(musb->controller, "ID float\n");
 134                 return NOTIFY_DONE;
 135         }
 136         return NOTIFY_OK;
 137 }
 138
 139 static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
 140 {
 141         unsigned long   flags;
 142         irqreturn_t     retval = IRQ_NONE;
 143         struct musb     *musb = __hci;
 144
 145         spin_lock_irqsave(&musb->lock, flags);
 146
 147         musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
 148         musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
 149         musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
 150
 151         if (musb->int_usb || musb->int_tx || musb->int_rx)
 152                 retval = musb_interrupt(musb);
 153
 154         spin_unlock_irqrestore(&musb->lock, flags);
 155
 156         return retval;
 157 }
 158
 159 static int ux500_musb_init(struct musb *musb)
 160 {
 161         int status;
 162
 163         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
 164         if (IS_ERR_OR_NULL(musb->xceiv)) {
 165                 pr_err("HS USB OTG: no transceiver configured\n");
 166                 return -EPROBE_DEFER;
 167         }
 168
 169         musb->nb.notifier_call = musb_otg_notifications;
 170         status = usb_register_notifier(musb->xceiv, &musb->nb);
 171         if (status < 0) {
 172                 dev_dbg(musb->controller, "notification register failed\n");
 173                 return status;
 174         }
 175
 176         musb->isr = ux500_musb_interrupt;
 177
 178         return 0;
 179 }
 180
 181 static int ux500_musb_exit(struct musb *musb)
 182 {
 183         usb_unregister_notifier(musb->xceiv, &musb->nb);
 184
 185         usb_put_phy(musb->xceiv);
 186
 187         return 0;
 188 }
 189
 190 static const struct musb_platform_ops ux500_ops = {
 191         .init           = ux500_musb_init,
 192         .exit           = ux500_musb_exit,
 193
 194         .set_vbus       = ux500_musb_set_vbus,
 195 };
 196
 197 static struct musb_hdrc_platform_data *
 198 ux500_of_probe(struct platform_device *pdev, struct device_node *np)
 199 {
 200         struct musb_hdrc_platform_data *pdata;
 201         const char *mode;
 202         int strlen;
 203
 204         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 205         if (!pdata)
 206                 return NULL;
 207
 208         mode = of_get_property(np, "dr_mode", &strlen);
 209         if (!mode) {
 210                 dev_err(&pdev->dev, "No 'dr_mode' property found\n");
 211                 return NULL;
 212         }
 213
 214         if (strlen > 0) {
 215                 if (!strcmp(mode, "host"))
 216                         pdata->mode = MUSB_HOST;
 217                 if (!strcmp(mode, "otg"))
 218                         pdata->mode = MUSB_OTG;
 219                 if (!strcmp(mode, "peripheral"))
 220                         pdata->mode = MUSB_PERIPHERAL;
 221         }
 222
 223         return pdata;
 224 }
 225
 226 static int ux500_probe(struct platform_device *pdev)
 227 {
 228         struct resource musb_resources[2];
 229         struct musb_hdrc_platform_data  *pdata = dev_get_platdata(&pdev->dev);
 230         struct device_node              *np = pdev->dev.of_node;
 231         struct platform_device          *musb;
 232         struct ux500_glue               *glue;
 233         struct clk                      *clk;
 234         int                             ret = -ENOMEM;
 235
 236         if (!pdata) {
 237                 if (np) {
 238                         pdata = ux500_of_probe(pdev, np);
 239                         if (!pdata)
 240                                 goto err0;
 241
 242                         pdev->dev.platform_data = pdata;
 243                 } else {
 244                         dev_err(&pdev->dev, "no pdata or device tree found\n");
 245                         goto err0;
 246                 }
 247         }
 248
 249         glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
 250         if (!glue)
 251                 goto err0;
 252
 253         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
 254         if (!musb) {
 255                 dev_err(&pdev->dev, "failed to allocate musb device\n");
 256                 goto err0;
 257         }
 258
 259         clk = devm_clk_get(&pdev->dev, NULL);
 260         if (IS_ERR(clk)) {
 261                 dev_err(&pdev->dev, "failed to get clock\n");
 262                 ret = PTR_ERR(clk);
 263                 goto err1;
 264         }
 265
 266         ret = clk_prepare_enable(clk);
 267         if (ret) {
 268                 dev_err(&pdev->dev, "failed to enable clock\n");
 269                 goto err1;
 270         }
 271
 272         musb->dev.parent                = &pdev->dev;
 273         musb->dev.dma_mask              = &pdev->dev.coherent_dma_mask;
 274         musb->dev.coherent_dma_mask     = pdev->dev.coherent_dma_mask;
 275
 276         glue->dev                       = &pdev->dev;
 277         glue->musb                      = musb;
 278         glue->clk                       = clk;
 279
 280         pdata->platform_ops             = &ux500_ops;
 281         pdata->config                   = &ux500_musb_hdrc_config;
 282
 283         platform_set_drvdata(pdev, glue);
 284
 285         memset(musb_resources, 0x00, sizeof(*musb_resources) *
 286                         ARRAY_SIZE(musb_resources));
 287
 288         musb_resources[0].name = pdev->resource[0].name;
 289         musb_resources[0].start = pdev->resource[0].start;
 290         musb_resources[0].end = pdev->resource[0].end;
 291         musb_resources[0].flags = pdev->resource[0].flags;
 292
 293         musb_resources[1].name = pdev->resource[1].name;
 294         musb_resources[1].start = pdev->resource[1].start;
 295         musb_resources[1].end = pdev->resource[1].end;
 296         musb_resources[1].flags = pdev->resource[1].flags;
 297
 298         ret = platform_device_add_resources(musb, musb_resources,
 299                         ARRAY_SIZE(musb_resources));
 300         if (ret) {
 301                 dev_err(&pdev->dev, "failed to add resources\n");
 302                 goto err2;
 303         }
 304
 305         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 306         if (ret) {
 307                 dev_err(&pdev->dev, "failed to add platform_data\n");
 308                 goto err2;
 309         }
 310
 311         ret = platform_device_add(musb);
 312         if (ret) {
 313                 dev_err(&pdev->dev, "failed to register musb device\n");
 314                 goto err2;
 315         }
 316
 317         return 0;
 318
 319 err2:
 320         clk_disable_unprepare(clk);
 321
 322 err1:
 323         platform_device_put(musb);
 324
 325 err0:
 326         return ret;
 327 }
 328
 329 static int ux500_remove(struct platform_device *pdev)
 330 {
 331         struct ux500_glue       *glue = platform_get_drvdata(pdev);
 332
 333         platform_device_unregister(glue->musb);
 334         clk_disable_unprepare(glue->clk);
 335
 336         return 0;
 337 }
 338
 339 #ifdef CONFIG_PM
 340 static int ux500_suspend(struct device *dev)
 341 {
 342         struct ux500_glue       *glue = dev_get_drvdata(dev);
 343         struct musb             *musb = glue_to_musb(glue);
 344
 345         usb_phy_set_suspend(musb->xceiv, 1);
 346         clk_disable_unprepare(glue->clk);
 347
 348         return 0;
 349 }
 350
 351 static int ux500_resume(struct device *dev)
 352 {
 353         struct ux500_glue       *glue = dev_get_drvdata(dev);
 354         struct musb             *musb = glue_to_musb(glue);
 355         int                     ret;
 356
 357         ret = clk_prepare_enable(glue->clk);
 358         if (ret) {
 359                 dev_err(dev, "failed to enable clock\n");
 360                 return ret;
 361         }
 362
 363         usb_phy_set_suspend(musb->xceiv, 0);
 364
 365         return 0;
 366 }
 367 #endif
 368
 369 static SIMPLE_DEV_PM_OPS(ux500_pm_ops, ux500_suspend, ux500_resume);
 370
 371 static const struct of_device_id ux500_match[] = {
 372         { .compatible = "stericsson,db8500-musb", },
 373         {}
 374 };
 375
 376 static struct platform_driver ux500_driver = {
 377         .probe          = ux500_probe,
 378         .remove         = ux500_remove,
 379         .driver         = {
 380                 .name   = "musb-ux500",
 381                 .pm     = &ux500_pm_ops,
 382                 .of_match_table = ux500_match,
 383         },
 384 };
 385
 386 MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
 387 MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
 388 MODULE_LICENSE("GPL v2");
 389 module_platform_driver(ux500_driver);