1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * OHCI HCD (Host Controller Driver) for USB. 4 * 5 * Copyright (C) 2010 ST Microelectronics. 6 * Deepak Sikri<deepak.sikri@st.com> 7 * 8 * Based on various ohci-*.c drivers 9 */ 10 11 #include <linux/clk.h> 12 #include <linux/dma-mapping.h> 13 #include <linux/io.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/of.h> 17 #include <linux/platform_device.h> 18 #include <linux/signal.h> 19 #include <linux/usb.h> 20 #include <linux/usb/hcd.h> 21 22 #include "ohci.h" 23 24 #define DRIVER_DESC "OHCI SPEAr driver" 25 26 struct spear_ohci { 27 struct clk *clk; 28 }; 29 30 #define to_spear_ohci(hcd) (struct spear_ohci *)(hcd_to_ohci(hcd)->priv) 31 32 static struct hc_driver __read_mostly ohci_spear_hc_driver; 33 34 static int spear_ohci_hcd_drv_probe(struct platform_device *pdev) 35 { 36 const struct hc_driver *driver = &ohci_spear_hc_driver; 37 struct usb_hcd *hcd = NULL; 38 struct clk *usbh_clk; 39 struct spear_ohci *sohci_p; 40 struct resource *res; 41 int retval, irq; 42 43 irq = platform_get_irq(pdev, 0); 44 if (irq < 0) { 45 retval = irq; 46 goto fail; 47 } 48 49 /* 50 * Right now device-tree probed devices don't get dma_mask set. 51 * Since shared usb code relies on it, set it here for now. 52 * Once we have dma capability bindings this can go away. 53 */ 54 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 55 if (retval) 56 goto fail; 57 58 usbh_clk = devm_clk_get(&pdev->dev, NULL); 59 if (IS_ERR(usbh_clk)) { 60 dev_err(&pdev->dev, "Error getting interface clock\n"); 61 retval = PTR_ERR(usbh_clk); 62 goto fail; 63 } 64 65 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); 66 if (!hcd) { 67 retval = -ENOMEM; 68 goto fail; 69 } 70 71 hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 72 if (IS_ERR(hcd->regs)) { 73 retval = PTR_ERR(hcd->regs); 74 goto err_put_hcd; 75 } 76 77 hcd->rsrc_start = res->start; 78 hcd->rsrc_len = resource_size(res); 79 80 sohci_p = to_spear_ohci(hcd); 81 sohci_p->clk = usbh_clk; 82 83 clk_prepare_enable(sohci_p->clk); 84 85 retval = usb_add_hcd(hcd, irq, 0); 86 if (retval == 0) { 87 device_wakeup_enable(hcd->self.controller); 88 return retval; 89 } 90 91 clk_disable_unprepare(sohci_p->clk); 92 err_put_hcd: 93 usb_put_hcd(hcd); 94 fail: 95 dev_err(&pdev->dev, "init fail, %d\n", retval); 96 97 return retval; 98 } 99 100 static void spear_ohci_hcd_drv_remove(struct platform_device *pdev) 101 { 102 struct usb_hcd *hcd = platform_get_drvdata(pdev); 103 struct spear_ohci *sohci_p = to_spear_ohci(hcd); 104 105 usb_remove_hcd(hcd); 106 if (sohci_p->clk) 107 clk_disable_unprepare(sohci_p->clk); 108 109 usb_put_hcd(hcd); 110 } 111 112 #if defined(CONFIG_PM) 113 static int spear_ohci_hcd_drv_suspend(struct platform_device *pdev, 114 pm_message_t message) 115 { 116 struct usb_hcd *hcd = platform_get_drvdata(pdev); 117 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 118 struct spear_ohci *sohci_p = to_spear_ohci(hcd); 119 bool do_wakeup = device_may_wakeup(&pdev->dev); 120 int ret; 121 122 if (time_before(jiffies, ohci->next_statechange)) 123 msleep(5); 124 ohci->next_statechange = jiffies; 125 126 ret = ohci_suspend(hcd, do_wakeup); 127 if (ret) 128 return ret; 129 130 clk_disable_unprepare(sohci_p->clk); 131 132 return ret; 133 } 134 135 static int spear_ohci_hcd_drv_resume(struct platform_device *dev) 136 { 137 struct usb_hcd *hcd = platform_get_drvdata(dev); 138 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 139 struct spear_ohci *sohci_p = to_spear_ohci(hcd); 140 141 if (time_before(jiffies, ohci->next_statechange)) 142 msleep(5); 143 ohci->next_statechange = jiffies; 144 145 clk_prepare_enable(sohci_p->clk); 146 ohci_resume(hcd, false); 147 return 0; 148 } 149 #endif 150 151 static const struct of_device_id spear_ohci_id_table[] = { 152 { .compatible = "st,spear600-ohci", }, 153 { }, 154 }; 155 MODULE_DEVICE_TABLE(of, spear_ohci_id_table); 156 157 /* Driver definition to register with the platform bus */ 158 static struct platform_driver spear_ohci_hcd_driver = { 159 .probe = spear_ohci_hcd_drv_probe, 160 .remove = spear_ohci_hcd_drv_remove, 161 #ifdef CONFIG_PM 162 .suspend = spear_ohci_hcd_drv_suspend, 163 .resume = spear_ohci_hcd_drv_resume, 164 #endif 165 .driver = { 166 .name = "spear-ohci", 167 .of_match_table = spear_ohci_id_table, 168 }, 169 }; 170 171 static const struct ohci_driver_overrides spear_overrides __initconst = { 172 .extra_priv_size = sizeof(struct spear_ohci), 173 }; 174 static int __init ohci_spear_init(void) 175 { 176 if (usb_disabled()) 177 return -ENODEV; 178 179 ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides); 180 return platform_driver_register(&spear_ohci_hcd_driver); 181 } 182 module_init(ohci_spear_init); 183 184 static void __exit ohci_spear_cleanup(void) 185 { 186 platform_driver_unregister(&spear_ohci_hcd_driver); 187 } 188 module_exit(ohci_spear_cleanup); 189 190 MODULE_DESCRIPTION(DRIVER_DESC); 191 MODULE_AUTHOR("Deepak Sikri"); 192 MODULE_LICENSE("GPL v2"); 193 MODULE_ALIAS("platform:spear-ohci"); 194