drivers/usb/gadget/udc/snps_udc_plat.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * snps_udc_plat.c - Synopsys UDC Platform Driver
   4  *
   5  * Copyright (C) 2016 Broadcom
   6  */
   7
   8 #include <linux/extcon.h>
   9 #include <linux/of_address.h>
  10 #include <linux/of_irq.h>
  11 #include <linux/of_gpio.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/phy/phy.h>
  14 #include <linux/module.h>
  15 #include <linux/dmapool.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/moduleparam.h>
  18 #include "amd5536udc.h"
  19
  20 /* description */
  21 #define UDC_MOD_DESCRIPTION     "Synopsys UDC platform driver"
  22
  23 static void start_udc(struct udc *udc)
  24 {
  25         if (udc->driver) {
  26                 dev_info(udc->dev, "Connecting...\n");
  27                 udc_enable_dev_setup_interrupts(udc);
  28                 udc_basic_init(udc);
  29                 udc->connected = 1;
  30         }
  31 }
  32
  33 static void stop_udc(struct udc *udc)
  34 {
  35         int tmp;
  36         u32 reg;
  37
  38         spin_lock(&udc->lock);
  39
  40         /* Flush the receieve fifo */
  41         reg = readl(&udc->regs->ctl);
  42         reg |= AMD_BIT(UDC_DEVCTL_SRX_FLUSH);
  43         writel(reg, &udc->regs->ctl);
  44
  45         reg = readl(&udc->regs->ctl);
  46         reg &= ~(AMD_BIT(UDC_DEVCTL_SRX_FLUSH));
  47         writel(reg, &udc->regs->ctl);
  48         dev_dbg(udc->dev, "ep rx queue flushed\n");
  49
  50         /* Mask interrupts. Required more so when the
  51          * UDC is connected to a DRD phy.
  52          */
  53         udc_mask_unused_interrupts(udc);
  54
  55         /* Disconnect gadget driver */
  56         if (udc->driver) {
  57                 spin_unlock(&udc->lock);
  58                 udc->driver->disconnect(&udc->gadget);
  59                 spin_lock(&udc->lock);
  60
  61                 /* empty queues */
  62                 for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
  63                         empty_req_queue(&udc->ep[tmp]);
  64         }
  65         udc->connected = 0;
  66
  67         spin_unlock(&udc->lock);
  68         dev_info(udc->dev, "Device disconnected\n");
  69 }
  70
  71 static void udc_drd_work(struct work_struct *work)
  72 {
  73         struct udc *udc;
  74
  75         udc = container_of(to_delayed_work(work),
  76                            struct udc, drd_work);
  77
  78         if (udc->conn_type) {
  79                 dev_dbg(udc->dev, "idle -> device\n");
  80                 start_udc(udc);
  81         } else {
  82                 dev_dbg(udc->dev, "device -> idle\n");
  83                 stop_udc(udc);
  84         }
  85 }
  86
  87 static int usbd_connect_notify(struct notifier_block *self,
  88                                unsigned long event, void *ptr)
  89 {
  90         struct udc *udc = container_of(self, struct udc, nb);
  91
  92         dev_dbg(udc->dev, "%s: event: %lu\n", __func__, event);
  93
  94         udc->conn_type = event;
  95
  96         schedule_delayed_work(&udc->drd_work, 0);
  97
  98         return NOTIFY_OK;
  99 }
 100
 101 static int udc_plat_probe(struct platform_device *pdev)
 102 {
 103         struct device *dev = &pdev->dev;
 104         struct resource *res;
 105         struct udc *udc;
 106         int ret;
 107
 108         udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
 109         if (!udc)
 110                 return -ENOMEM;
 111
 112         spin_lock_init(&udc->lock);
 113         udc->dev = dev;
 114
 115         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 116         udc->virt_addr = devm_ioremap_resource(dev, res);
 117         if (IS_ERR(udc->regs))
 118                 return PTR_ERR(udc->regs);
 119
 120         /* udc csr registers base */
 121         udc->csr = udc->virt_addr + UDC_CSR_ADDR;
 122
 123         /* dev registers base */
 124         udc->regs = udc->virt_addr + UDC_DEVCFG_ADDR;
 125
 126         /* ep registers base */
 127         udc->ep_regs = udc->virt_addr + UDC_EPREGS_ADDR;
 128
 129         /* fifo's base */
 130         udc->rxfifo = (u32 __iomem *)(udc->virt_addr + UDC_RXFIFO_ADDR);
 131         udc->txfifo = (u32 __iomem *)(udc->virt_addr + UDC_TXFIFO_ADDR);
 132
 133         udc->phys_addr = (unsigned long)res->start;
 134
 135         udc->irq = irq_of_parse_and_map(dev->of_node, 0);
 136         if (udc->irq <= 0) {
 137                 dev_err(dev, "Can't parse and map interrupt\n");
 138                 return -EINVAL;
 139         }
 140
 141         udc->udc_phy = devm_of_phy_get_by_index(dev, dev->of_node, 0);
 142         if (IS_ERR(udc->udc_phy)) {
 143                 dev_err(dev, "Failed to obtain phy from device tree\n");
 144                 return PTR_ERR(udc->udc_phy);
 145         }
 146
 147         ret = phy_init(udc->udc_phy);
 148         if (ret) {
 149                 dev_err(dev, "UDC phy init failed");
 150                 return ret;
 151         }
 152
 153         ret = phy_power_on(udc->udc_phy);
 154         if (ret) {
 155                 dev_err(dev, "UDC phy power on failed");
 156                 phy_exit(udc->udc_phy);
 157                 return ret;
 158         }
 159
 160         /* Register for extcon if supported */
 161         if (of_get_property(dev->of_node, "extcon", NULL)) {
 162                 udc->edev = extcon_get_edev_by_phandle(dev, 0);
 163                 if (IS_ERR(udc->edev)) {
 164                         if (PTR_ERR(udc->edev) == -EPROBE_DEFER)
 165                                 return -EPROBE_DEFER;
 166                         dev_err(dev, "Invalid or missing extcon\n");
 167                         ret = PTR_ERR(udc->edev);
 168                         goto exit_phy;
 169                 }
 170
 171                 udc->nb.notifier_call = usbd_connect_notify;
 172                 ret = extcon_register_notifier(udc->edev, EXTCON_USB,
 173                                                &udc->nb);
 174                 if (ret < 0) {
 175                         dev_err(dev, "Can't register extcon device\n");
 176                         goto exit_phy;
 177                 }
 178
 179                 ret = extcon_get_state(udc->edev, EXTCON_USB);
 180                 if (ret < 0) {
 181                         dev_err(dev, "Can't get cable state\n");
 182                         goto exit_extcon;
 183                 } else if (ret) {
 184                         udc->conn_type = ret;
 185                 }
 186                 INIT_DELAYED_WORK(&udc->drd_work, udc_drd_work);
 187         }
 188
 189         /* init dma pools */
 190         if (use_dma) {
 191                 ret = init_dma_pools(udc);
 192                 if (ret != 0)
 193                         goto exit_extcon;
 194         }
 195
 196         ret = devm_request_irq(dev, udc->irq, udc_irq, IRQF_SHARED,
 197                                "snps-udc", udc);
 198         if (ret < 0) {
 199                 dev_err(dev, "Request irq %d failed for UDC\n", udc->irq);
 200                 goto exit_dma;
 201         }
 202
 203         platform_set_drvdata(pdev, udc);
 204         udc->chiprev = UDC_BCM_REV;
 205
 206         if (udc_probe(udc)) {
 207                 ret = -ENODEV;
 208                 goto exit_dma;
 209         }
 210         dev_info(dev, "Synopsys UDC platform driver probe successful\n");
 211
 212         return 0;
 213
 214 exit_dma:
 215         if (use_dma)
 216                 free_dma_pools(udc);
 217 exit_extcon:
 218         if (udc->edev)
 219                 extcon_unregister_notifier(udc->edev, EXTCON_USB, &udc->nb);
 220 exit_phy:
 221         if (udc->udc_phy) {
 222                 phy_power_off(udc->udc_phy);
 223                 phy_exit(udc->udc_phy);
 224         }
 225         return ret;
 226 }
 227
 228 static int udc_plat_remove(struct platform_device *pdev)
 229 {
 230         struct udc *dev;
 231
 232         dev = platform_get_drvdata(pdev);
 233
 234         usb_del_gadget_udc(&dev->gadget);
 235         /* gadget driver must not be registered */
 236         if (WARN_ON(dev->driver))
 237                 return 0;
 238
 239         /* dma pool cleanup */
 240         free_dma_pools(dev);
 241
 242         udc_remove(dev);
 243
 244         platform_set_drvdata(pdev, NULL);
 245
 246         if (dev->drd_wq) {
 247                 flush_workqueue(dev->drd_wq);
 248                 destroy_workqueue(dev->drd_wq);
 249         }
 250
 251         phy_power_off(dev->udc_phy);
 252         phy_exit(dev->udc_phy);
 253         extcon_unregister_notifier(dev->edev, EXTCON_USB, &dev->nb);
 254
 255         dev_info(&pdev->dev, "Synopsys UDC platform driver removed\n");
 256
 257         return 0;
 258 }
 259
 260 #ifdef CONFIG_PM_SLEEP
 261 static int udc_plat_suspend(struct device *dev)
 262 {
 263         struct udc *udc;
 264
 265         udc = dev_get_drvdata(dev);
 266         stop_udc(udc);
 267
 268         if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
 269                 dev_dbg(udc->dev, "device -> idle\n");
 270                 stop_udc(udc);
 271         }
 272         phy_power_off(udc->udc_phy);
 273         phy_exit(udc->udc_phy);
 274
 275         return 0;
 276 }
 277
 278 static int udc_plat_resume(struct device *dev)
 279 {
 280         struct udc *udc;
 281         int ret;
 282
 283         udc = dev_get_drvdata(dev);
 284
 285         ret = phy_init(udc->udc_phy);
 286         if (ret) {
 287                 dev_err(udc->dev, "UDC phy init failure");
 288                 return ret;
 289         }
 290
 291         ret = phy_power_on(udc->udc_phy);
 292         if (ret) {
 293                 dev_err(udc->dev, "UDC phy power on failure");
 294                 phy_exit(udc->udc_phy);
 295                 return ret;
 296         }
 297
 298         if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
 299                 dev_dbg(udc->dev, "idle -> device\n");
 300                 start_udc(udc);
 301         }
 302
 303         return 0;
 304 }
 305 static const struct dev_pm_ops udc_plat_pm_ops = {
 306         .suspend        = udc_plat_suspend,
 307         .resume         = udc_plat_resume,
 308 };
 309 #endif
 310
 311 #if defined(CONFIG_OF)
 312 static const struct of_device_id of_udc_match[] = {
 313         { .compatible = "brcm,ns2-udc", },
 314         { .compatible = "brcm,cygnus-udc", },
 315         { .compatible = "brcm,iproc-udc", },
 316         { }
 317 };
 318 MODULE_DEVICE_TABLE(of, of_udc_match);
 319 #endif
 320
 321 static struct platform_driver udc_plat_driver = {
 322         .probe          = udc_plat_probe,
 323         .remove         = udc_plat_remove,
 324         .driver         = {
 325                 .name   = "snps-udc-plat",
 326                 .of_match_table = of_match_ptr(of_udc_match),
 327 #ifdef CONFIG_PM_SLEEP
 328                 .pm     = &udc_plat_pm_ops,
 329 #endif
 330         },
 331 };
 332 module_platform_driver(udc_plat_driver);
 333
 334 MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
 335 MODULE_AUTHOR("Broadcom");
 336 MODULE_LICENSE("GPL v2");