drivers/usb/chipidea/ci_hdrc_npcm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2023 Nuvoton Technology corporation.
   3
   4 #include <linux/module.h>
   5 #include <linux/platform_device.h>
   6 #include <linux/pm_runtime.h>
   7 #include <linux/usb/chipidea.h>
   8 #include <linux/clk.h>
   9 #include <linux/io.h>
  10 #include <linux/reset-controller.h>
  11 #include <linux/of.h>
  12
  13 #include "ci.h"
  14
  15 struct npcm_udc_data {
  16         struct platform_device  *ci;
  17         struct clk              *core_clk;
  18         struct ci_hdrc_platform_data pdata;
  19 };
  20
  21 static int npcm_udc_notify_event(struct ci_hdrc *ci, unsigned int event)
  22 {
  23         struct device *dev = ci->dev->parent;
  24
  25         switch (event) {
  26         case CI_HDRC_CONTROLLER_RESET_EVENT:
  27                 /* clear all mode bits */
  28                 hw_write(ci, OP_USBMODE, 0xffffffff, 0x0);
  29                 break;
  30         default:
  31                 dev_dbg(dev, "unknown ci_hdrc event (%d)\n", event);
  32                 break;
  33         }
  34
  35         return 0;
  36 }
  37
  38 static int npcm_udc_probe(struct platform_device *pdev)
  39 {
  40         int ret;
  41         struct npcm_udc_data *ci;
  42         struct platform_device *plat_ci;
  43         struct device *dev = &pdev->dev;
  44
  45         ci = devm_kzalloc(&pdev->dev, sizeof(*ci), GFP_KERNEL);
  46         if (!ci)
  47                 return -ENOMEM;
  48         platform_set_drvdata(pdev, ci);
  49
  50         ci->core_clk = devm_clk_get_optional(dev, NULL);
  51         if (IS_ERR(ci->core_clk))
  52                 return PTR_ERR(ci->core_clk);
  53
  54         ret = clk_prepare_enable(ci->core_clk);
  55         if (ret)
  56                 return dev_err_probe(dev, ret, "failed to enable the clock: %d\n", ret);
  57
  58         ci->pdata.name = dev_name(dev);
  59         ci->pdata.capoffset = DEF_CAPOFFSET;
  60         ci->pdata.flags = CI_HDRC_REQUIRES_ALIGNED_DMA |
  61                 CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS;
  62         ci->pdata.phy_mode = USBPHY_INTERFACE_MODE_UTMI;
  63         ci->pdata.notify_event = npcm_udc_notify_event;
  64
  65         plat_ci = ci_hdrc_add_device(dev, pdev->resource, pdev->num_resources,
  66                                      &ci->pdata);
  67         if (IS_ERR(plat_ci)) {
  68                 ret = PTR_ERR(plat_ci);
  69                 dev_err(dev, "failed to register HDRC NPCM device: %d\n", ret);
  70                 goto clk_err;
  71         }
  72
  73         pm_runtime_no_callbacks(dev);
  74         pm_runtime_enable(dev);
  75
  76         return 0;
  77
  78 clk_err:
  79         clk_disable_unprepare(ci->core_clk);
  80         return ret;
  81 }
  82
  83 static void npcm_udc_remove(struct platform_device *pdev)
  84 {
  85         struct npcm_udc_data *ci = platform_get_drvdata(pdev);
  86
  87         pm_runtime_disable(&pdev->dev);
  88         ci_hdrc_remove_device(ci->ci);
  89         clk_disable_unprepare(ci->core_clk);
  90 }
  91
  92 static const struct of_device_id npcm_udc_dt_match[] = {
  93         { .compatible = "nuvoton,npcm750-udc", },
  94         { .compatible = "nuvoton,npcm845-udc", },
  95         { }
  96 };
  97 MODULE_DEVICE_TABLE(of, npcm_udc_dt_match);
  98
  99 static struct platform_driver npcm_udc_driver = {
 100         .probe = npcm_udc_probe,
 101         .remove = npcm_udc_remove,
 102         .driver = {
 103                 .name = "npcm_udc",
 104                 .of_match_table = npcm_udc_dt_match,
 105         },
 106 };
 107
 108 module_platform_driver(npcm_udc_driver);
 109
 110 MODULE_DESCRIPTION("NPCM USB device controller driver");
 111 MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
 112 MODULE_LICENSE("GPL v2");