drivers/usb/gadget/udc/snps_udc_plat.c

   1 /*
   2  * snps_udc_plat.c - Synopsys UDC Platform Driver
   3  *
   4  * Copyright (C) 2016 Broadcom
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation version 2.
   9  *
  10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  11  * kind, whether express or implied; without even the implied warranty
  12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/extcon.h>
  17 #include <linux/of_address.h>
  18 #include <linux/of_irq.h>
  19 #include <linux/of_gpio.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/phy/phy.h>
  22 #include <linux/module.h>
  23 #include <linux/dmapool.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/moduleparam.h>
  26 #include "amd5536udc.h"
  27
  28 /* description */
  29 #define UDC_MOD_DESCRIPTION     "Synopsys UDC platform driver"
  30
  31 static void start_udc(struct udc *udc)
  32 {
  33         if (udc->driver) {
  34                 dev_info(udc->dev, "Connecting...\n");
  35                 udc_enable_dev_setup_interrupts(udc);
  36                 udc_basic_init(udc);
  37                 udc->connected = 1;
  38         }
  39 }
  40
  41 static void stop_udc(struct udc *udc)
  42 {
  43         int tmp;
  44         u32 reg;
  45
  46         spin_lock(&udc->lock);
  47
  48         /* Flush the receieve fifo */
  49         reg = readl(&udc->regs->ctl);
  50         reg |= AMD_BIT(UDC_DEVCTL_SRX_FLUSH);
  51         writel(reg, &udc->regs->ctl);
  52
  53         reg = readl(&udc->regs->ctl);
  54         reg &= ~(AMD_BIT(UDC_DEVCTL_SRX_FLUSH));
  55         writel(reg, &udc->regs->ctl);
  56         dev_dbg(udc->dev, "ep rx queue flushed\n");
  57
  58         /* Mask interrupts. Required more so when the
  59          * UDC is connected to a DRD phy.
  60          */
  61         udc_mask_unused_interrupts(udc);
  62
  63         /* Disconnect gadget driver */
  64         if (udc->driver) {
  65                 spin_unlock(&udc->lock);
  66                 udc->driver->disconnect(&udc->gadget);
  67                 spin_lock(&udc->lock);
  68
  69                 /* empty queues */
  70                 for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
  71                         empty_req_queue(&udc->ep[tmp]);
  72         }
  73         udc->connected = 0;
  74
  75         spin_unlock(&udc->lock);
  76         dev_info(udc->dev, "Device disconnected\n");
  77 }
  78
  79 static void udc_drd_work(struct work_struct *work)
  80 {
  81         struct udc *udc;
  82
  83         udc = container_of(to_delayed_work(work),
  84                            struct udc, drd_work);
  85
  86         if (udc->conn_type) {
  87                 dev_dbg(udc->dev, "idle -> device\n");
  88                 start_udc(udc);
  89         } else {
  90                 dev_dbg(udc->dev, "device -> idle\n");
  91                 stop_udc(udc);
  92         }
  93 }
  94
  95 static int usbd_connect_notify(struct notifier_block *self,
  96                                unsigned long event, void *ptr)
  97 {
  98         struct udc *udc = container_of(self, struct udc, nb);
  99
 100         dev_dbg(udc->dev, "%s: event: %lu\n", __func__, event);
 101
 102         udc->conn_type = event;
 103
 104         schedule_delayed_work(&udc->drd_work, 0);
 105
 106         return NOTIFY_OK;
 107 }
 108
 109 static int udc_plat_probe(struct platform_device *pdev)
 110 {
 111         struct device *dev = &pdev->dev;
 112         struct resource *res;
 113         struct udc *udc;
 114         int ret;
 115
 116         udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
 117         if (!udc)
 118                 return -ENOMEM;
 119
 120         spin_lock_init(&udc->lock);
 121         udc->dev = dev;
 122
 123         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 124         udc->virt_addr = devm_ioremap_resource(dev, res);
 125         if (IS_ERR(udc->regs))
 126                 return PTR_ERR(udc->regs);
 127
 128         /* udc csr registers base */
 129         udc->csr = udc->virt_addr + UDC_CSR_ADDR;
 130
 131         /* dev registers base */
 132         udc->regs = udc->virt_addr + UDC_DEVCFG_ADDR;
 133
 134         /* ep registers base */
 135         udc->ep_regs = udc->virt_addr + UDC_EPREGS_ADDR;
 136
 137         /* fifo's base */
 138         udc->rxfifo = (u32 __iomem *)(udc->virt_addr + UDC_RXFIFO_ADDR);
 139         udc->txfifo = (u32 __iomem *)(udc->virt_addr + UDC_TXFIFO_ADDR);
 140
 141         udc->phys_addr = (unsigned long)res->start;
 142
 143         udc->irq = irq_of_parse_and_map(dev->of_node, 0);
 144         if (udc->irq <= 0) {
 145                 dev_err(dev, "Can't parse and map interrupt\n");
 146                 return -EINVAL;
 147         }
 148
 149         udc->udc_phy = devm_of_phy_get_by_index(dev, dev->of_node, 0);
 150         if (IS_ERR(udc->udc_phy)) {
 151                 dev_err(dev, "Failed to obtain phy from device tree\n");
 152                 return PTR_ERR(udc->udc_phy);
 153         }
 154
 155         ret = phy_init(udc->udc_phy);
 156         if (ret) {
 157                 dev_err(dev, "UDC phy init failed");
 158                 return ret;
 159         }
 160
 161         ret = phy_power_on(udc->udc_phy);
 162         if (ret) {
 163                 dev_err(dev, "UDC phy power on failed");
 164                 phy_exit(udc->udc_phy);
 165                 return ret;
 166         }
 167
 168         /* Register for extcon if supported */
 169         if (of_get_property(dev->of_node, "extcon", NULL)) {
 170                 udc->edev = extcon_get_edev_by_phandle(dev, 0);
 171                 if (IS_ERR(udc->edev)) {
 172                         if (PTR_ERR(udc->edev) == -EPROBE_DEFER)
 173                                 return -EPROBE_DEFER;
 174                         dev_err(dev, "Invalid or missing extcon\n");
 175                         ret = PTR_ERR(udc->edev);
 176                         goto exit_phy;
 177                 }
 178
 179                 udc->nb.notifier_call = usbd_connect_notify;
 180                 ret = extcon_register_notifier(udc->edev, EXTCON_USB,
 181                                                &udc->nb);
 182                 if (ret < 0) {
 183                         dev_err(dev, "Can't register extcon device\n");
 184                         goto exit_phy;
 185                 }
 186
 187                 ret = extcon_get_cable_state_(udc->edev, EXTCON_USB);
 188                 if (ret < 0) {
 189                         dev_err(dev, "Can't get cable state\n");
 190                         goto exit_extcon;
 191                 } else if (ret) {
 192                         udc->conn_type = ret;
 193                 }
 194                 INIT_DELAYED_WORK(&udc->drd_work, udc_drd_work);
 195         }
 196
 197         /* init dma pools */
 198         if (use_dma) {
 199                 ret = init_dma_pools(udc);
 200                 if (ret != 0)
 201                         goto exit_extcon;
 202         }
 203
 204         ret = devm_request_irq(dev, udc->irq, udc_irq, IRQF_SHARED,
 205                                "snps-udc", udc);
 206         if (ret < 0) {
 207                 dev_err(dev, "Request irq %d failed for UDC\n", udc->irq);
 208                 goto exit_dma;
 209         }
 210
 211         platform_set_drvdata(pdev, udc);
 212         udc->chiprev = UDC_BCM_REV;
 213
 214         if (udc_probe(udc)) {
 215                 ret = -ENODEV;
 216                 goto exit_dma;
 217         }
 218         dev_info(dev, "Synopsys UDC platform driver probe successful\n");
 219
 220         return 0;
 221
 222 exit_dma:
 223         if (use_dma)
 224                 free_dma_pools(udc);
 225 exit_extcon:
 226         if (udc->edev)
 227                 extcon_unregister_notifier(udc->edev, EXTCON_USB, &udc->nb);
 228 exit_phy:
 229         if (udc->udc_phy) {
 230                 phy_power_off(udc->udc_phy);
 231                 phy_exit(udc->udc_phy);
 232         }
 233         return ret;
 234 }
 235
 236 static int udc_plat_remove(struct platform_device *pdev)
 237 {
 238         struct udc *dev;
 239
 240         dev = platform_get_drvdata(pdev);
 241
 242         usb_del_gadget_udc(&dev->gadget);
 243         /* gadget driver must not be registered */
 244         if (WARN_ON(dev->driver))
 245                 return 0;
 246
 247         /* dma pool cleanup */
 248         free_dma_pools(dev);
 249
 250         udc_remove(dev);
 251
 252         platform_set_drvdata(pdev, NULL);
 253
 254         if (dev->drd_wq) {
 255                 flush_workqueue(dev->drd_wq);
 256                 destroy_workqueue(dev->drd_wq);
 257         }
 258
 259         phy_power_off(dev->udc_phy);
 260         phy_exit(dev->udc_phy);
 261         extcon_unregister_notifier(dev->edev, EXTCON_USB, &dev->nb);
 262
 263         dev_info(&pdev->dev, "Synopsys UDC platform driver removed\n");
 264
 265         return 0;
 266 }
 267
 268 #ifdef CONFIG_PM_SLEEP
 269 static int udc_plat_suspend(struct device *dev)
 270 {
 271         struct udc *udc;
 272
 273         udc = dev_get_drvdata(dev);
 274         stop_udc(udc);
 275
 276         if (extcon_get_cable_state_(udc->edev, EXTCON_USB) > 0) {
 277                 dev_dbg(udc->dev, "device -> idle\n");
 278                 stop_udc(udc);
 279         }
 280         phy_power_off(udc->udc_phy);
 281         phy_exit(udc->udc_phy);
 282
 283         return 0;
 284 }
 285
 286 static int udc_plat_resume(struct device *dev)
 287 {
 288         struct udc *udc;
 289         int ret;
 290
 291         udc = dev_get_drvdata(dev);
 292
 293         ret = phy_init(udc->udc_phy);
 294         if (ret) {
 295                 dev_err(udc->dev, "UDC phy init failure");
 296                 return ret;
 297         }
 298
 299         ret = phy_power_on(udc->udc_phy);
 300         if (ret) {
 301                 dev_err(udc->dev, "UDC phy power on failure");
 302                 phy_exit(udc->udc_phy);
 303                 return ret;
 304         }
 305
 306         if (extcon_get_cable_state_(udc->edev, EXTCON_USB) > 0) {
 307                 dev_dbg(udc->dev, "idle -> device\n");
 308                 start_udc(udc);
 309         }
 310
 311         return 0;
 312 }
 313 static const struct dev_pm_ops udc_plat_pm_ops = {
 314         .suspend        = udc_plat_suspend,
 315         .resume         = udc_plat_resume,
 316 };
 317 #endif
 318
 319 #if defined(CONFIG_OF)
 320 static const struct of_device_id of_udc_match[] = {
 321         { .compatible = "brcm,ns2-udc", },
 322         { .compatible = "brcm,cygnus-udc", },
 323         { .compatible = "brcm,iproc-udc", },
 324         { }
 325 };
 326 MODULE_DEVICE_TABLE(of, of_udc_match);
 327 #endif
 328
 329 static struct platform_driver udc_plat_driver = {
 330         .probe          = udc_plat_probe,
 331         .remove         = udc_plat_remove,
 332         .driver         = {
 333                 .name   = "snps-udc-plat",
 334                 .of_match_table = of_match_ptr(of_udc_match),
 335 #ifdef CONFIG_PM_SLEEP
 336                 .pm     = &udc_plat_pm_ops,
 337 #endif
 338         },
 339 };
 340 module_platform_driver(udc_plat_driver);
 341
 342 MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
 343 MODULE_AUTHOR("Broadcom");
 344 MODULE_LICENSE("GPL v2");