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"); 213