drivers/usb/host/ehci-npcm7xx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Nuvoton NPCM7xx driver for EHCI HCD
   4  *
   5  * Copyright (C) 2018 Nuvoton Technologies,
   6  * Avi Fishman <avi.fishman@nuvoton.com> <avifishman70@gmail.com>
   7  * Tomer Maimon <tomer.maimon@nuvoton.com> <tmaimon77@gmail.com>
   8  *
   9  * Based on various ehci-spear.c driver
  10  */
  11
  12
  13 #include <linux/dma-mapping.h>
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/pm.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/hcd.h>
  22
  23 #include "ehci.h"
  24
  25 #include <linux/regmap.h>
  26 #include <linux/mfd/syscon.h>
  27
  28 #define DRIVER_DESC "EHCI npcm7xx driver"
  29
  30 static const char hcd_name[] = "npcm7xx-ehci";
  31
  32 #define  USB2PHYCTL_OFFSET 0x144
  33
  34 #define  IPSRST2_OFFSET 0x24
  35 #define  IPSRST3_OFFSET 0x34
  36
  37
  38 static struct hc_driver __read_mostly ehci_npcm7xx_hc_driver;
  39
  40 #ifdef CONFIG_PM_SLEEP
  41 static int ehci_npcm7xx_drv_suspend(struct device *dev)
  42 {
  43         struct usb_hcd *hcd = dev_get_drvdata(dev);
  44         bool do_wakeup = device_may_wakeup(dev);
  45
  46         return ehci_suspend(hcd, do_wakeup);
  47 }
  48
  49 static int ehci_npcm7xx_drv_resume(struct device *dev)
  50 {
  51         struct usb_hcd *hcd = dev_get_drvdata(dev);
  52
  53         ehci_resume(hcd, false);
  54         return 0;
  55 }
  56 #endif /* CONFIG_PM_SLEEP */
  57
  58 static SIMPLE_DEV_PM_OPS(ehci_npcm7xx_pm_ops, ehci_npcm7xx_drv_suspend,
  59                 ehci_npcm7xx_drv_resume);
  60
  61 static int npcm7xx_ehci_hcd_drv_probe(struct platform_device *pdev)
  62 {
  63         struct usb_hcd *hcd;
  64         struct resource *res;
  65         struct regmap *gcr_regmap;
  66         struct regmap *rst_regmap;
  67         const struct hc_driver *driver = &ehci_npcm7xx_hc_driver;
  68         int irq;
  69         int retval;
  70
  71         dev_dbg(&pdev->dev,     "initializing npcm7xx ehci USB Controller\n");
  72
  73         gcr_regmap = syscon_regmap_lookup_by_compatible("nuvoton,npcm750-gcr");
  74         if (IS_ERR(gcr_regmap)) {
  75                 dev_err(&pdev->dev, "%s: failed to find nuvoton,npcm750-gcr\n",
  76                         __func__);
  77                 return PTR_ERR(gcr_regmap);
  78         }
  79
  80         rst_regmap = syscon_regmap_lookup_by_compatible("nuvoton,npcm750-rst");
  81         if (IS_ERR(rst_regmap)) {
  82                 dev_err(&pdev->dev, "%s: failed to find nuvoton,npcm750-rst\n",
  83                         __func__);
  84                 return PTR_ERR(rst_regmap);
  85         }
  86
  87         /********* phy init  ******/
  88         // reset usb host
  89         regmap_update_bits(rst_regmap, IPSRST2_OFFSET,
  90                         (0x1 << 26), (0x1 << 26));
  91         regmap_update_bits(rst_regmap, IPSRST3_OFFSET,
  92                         (0x1 << 25), (0x1 << 25));
  93         regmap_update_bits(gcr_regmap, USB2PHYCTL_OFFSET,
  94                         (0x1 << 28), 0);
  95
  96         udelay(1);
  97
  98         // enable phy
  99         regmap_update_bits(rst_regmap, IPSRST3_OFFSET,
 100                         (0x1 << 25), 0);
 101
 102         udelay(50); // enable phy
 103
 104         regmap_update_bits(gcr_regmap, USB2PHYCTL_OFFSET,
 105                         (0x1 << 28), (0x1 << 28));
 106
 107         // enable host
 108         regmap_update_bits(rst_regmap, IPSRST2_OFFSET,
 109                         (0x1 << 26), 0);
 110
 111         if (usb_disabled())
 112                 return -ENODEV;
 113
 114         irq = platform_get_irq(pdev, 0);
 115         if (irq < 0) {
 116                 retval = irq;
 117                 goto fail;
 118         }
 119
 120         /*
 121          * Right now device-tree probed devices don't get dma_mask set.
 122          * Since shared usb code relies on it, set it here for now.
 123          * Once we have dma capability bindings this can go away.
 124          */
 125         retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 126         if (retval)
 127                 goto fail;
 128
 129         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 130         if (!hcd) {
 131                 retval = -ENOMEM;
 132                 goto fail;
 133         }
 134
 135         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 136         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 137         if (IS_ERR(hcd->regs)) {
 138                 retval = PTR_ERR(hcd->regs);
 139                 goto err_put_hcd;
 140         }
 141         hcd->rsrc_start = res->start;
 142         hcd->rsrc_len = resource_size(res);
 143
 144         /* registers start at offset 0x0 */
 145         hcd_to_ehci(hcd)->caps = hcd->regs;
 146
 147         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 148         if (retval)
 149                 goto err_put_hcd;
 150
 151         device_wakeup_enable(hcd->self.controller);
 152         return retval;
 153
 154 err_put_hcd:
 155         usb_put_hcd(hcd);
 156 fail:
 157         dev_err(&pdev->dev, "init fail, %d\n", retval);
 158
 159         return retval;
 160 }
 161
 162 static int npcm7xx_ehci_hcd_drv_remove(struct platform_device *pdev)
 163 {
 164         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 165
 166         usb_remove_hcd(hcd);
 167
 168         usb_put_hcd(hcd);
 169
 170         return 0;
 171 }
 172
 173 static const struct of_device_id npcm7xx_ehci_id_table[] = {
 174         { .compatible = "nuvoton,npcm750-ehci" },
 175         { },
 176 };
 177 MODULE_DEVICE_TABLE(of, npcm7xx_ehci_id_table);
 178
 179 static struct platform_driver npcm7xx_ehci_hcd_driver = {
 180         .probe          = npcm7xx_ehci_hcd_drv_probe,
 181         .remove         = npcm7xx_ehci_hcd_drv_remove,
 182         .shutdown       = usb_hcd_platform_shutdown,
 183         .driver         = {
 184                 .name = "npcm7xx-ehci",
 185                 .bus = &platform_bus_type,
 186                 .pm = &ehci_npcm7xx_pm_ops,
 187                 .of_match_table = npcm7xx_ehci_id_table,
 188         }
 189 };
 190
 191 static int __init ehci_npcm7xx_init(void)
 192 {
 193         if (usb_disabled())
 194                 return -ENODEV;
 195
 196         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 197
 198         ehci_init_driver(&ehci_npcm7xx_hc_driver, NULL);
 199         return platform_driver_register(&npcm7xx_ehci_hcd_driver);
 200 }
 201 module_init(ehci_npcm7xx_init);
 202
 203 static void __exit ehci_npcm7xx_cleanup(void)
 204 {
 205         platform_driver_unregister(&npcm7xx_ehci_hcd_driver);
 206 }
 207 module_exit(ehci_npcm7xx_cleanup);
 208
 209 MODULE_DESCRIPTION(DRIVER_DESC);
 210 MODULE_ALIAS("platform:npcm7xx-ehci");
 211 MODULE_AUTHOR("Avi Fishman");
 212 MODULE_LICENSE("GPL v2");