1 /* 2 * OHCI HCD (Host Controller Driver) for USB. 3 * 4 * Copyright (C) 2010 ST Microelectronics. 5 * Deepak Sikri<deepak.sikri@st.com> 6 * 7 * Based on various ohci-*.c drivers 8 * 9 * This file is licensed under the terms of the GNU General Public 10 * License version 2. This program is licensed "as is" without any 11 * warranty of any kind, whether express or implied. 12 */ 13 14 #include <linux/clk.h> 15 #include <linux/dma-mapping.h> 16 #include <linux/io.h> 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/of.h> 20 #include <linux/platform_device.h> 21 #include <linux/signal.h> 22 #include <linux/usb.h> 23 #include <linux/usb/hcd.h> 24 25 #include "ohci.h" 26 27 #define DRIVER_DESC "OHCI SPEAr driver" 28 29 static const char hcd_name[] = "SPEAr-ohci"; 30 struct spear_ohci { 31 struct clk *clk; 32 }; 33 34 #define to_spear_ohci(hcd) (struct spear_ohci *)(hcd_to_ohci(hcd)->priv) 35 36 static struct hc_driver __read_mostly ohci_spear_hc_driver; 37 38 static int spear_ohci_hcd_drv_probe(struct platform_device *pdev) 39 { 40 const struct hc_driver *driver = &ohci_spear_hc_driver; 41 struct ohci_hcd *ohci; 42 struct usb_hcd *hcd = NULL; 43 struct clk *usbh_clk; 44 struct spear_ohci *sohci_p; 45 struct resource *res; 46 int retval, irq; 47 48 irq = platform_get_irq(pdev, 0); 49 if (irq < 0) { 50 retval = irq; 51 goto fail; 52 } 53 54 /* 55 * Right now device-tree probed devices don't get dma_mask set. 56 * Since shared usb code relies on it, set it here for now. 57 * Once we have dma capability bindings this can go away. 58 */ 59 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 60 if (retval) 61 goto fail; 62 63 usbh_clk = devm_clk_get(&pdev->dev, NULL); 64 if (IS_ERR(usbh_clk)) { 65 dev_err(&pdev->dev, "Error getting interface clock\n"); 66 retval = PTR_ERR(usbh_clk); 67 goto fail; 68 } 69 70 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); 71 if (!hcd) { 72 retval = -ENOMEM; 73 goto fail; 74 } 75 76 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 77 hcd->regs = devm_ioremap_resource(&pdev->dev, res); 78 if (IS_ERR(hcd->regs)) { 79 retval = PTR_ERR(hcd->regs); 80 goto err_put_hcd; 81 } 82 83 hcd->rsrc_start = pdev->resource[0].start; 84 hcd->rsrc_len = resource_size(res); 85 86 sohci_p = to_spear_ohci(hcd); 87 sohci_p->clk = usbh_clk; 88 89 clk_prepare_enable(sohci_p->clk); 90 91 ohci = hcd_to_ohci(hcd); 92 93 retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0); 94 if (retval == 0) { 95 device_wakeup_enable(hcd->self.controller); 96 return retval; 97 } 98 99 clk_disable_unprepare(sohci_p->clk); 100 err_put_hcd: 101 usb_put_hcd(hcd); 102 fail: 103 dev_err(&pdev->dev, "init fail, %d\n", retval); 104 105 return retval; 106 } 107 108 static int spear_ohci_hcd_drv_remove(struct platform_device *pdev) 109 { 110 struct usb_hcd *hcd = platform_get_drvdata(pdev); 111 struct spear_ohci *sohci_p = to_spear_ohci(hcd); 112 113 usb_remove_hcd(hcd); 114 if (sohci_p->clk) 115 clk_disable_unprepare(sohci_p->clk); 116 117 usb_put_hcd(hcd); 118 return 0; 119 } 120 121 #if defined(CONFIG_PM) 122 static int spear_ohci_hcd_drv_suspend(struct platform_device *pdev, 123 pm_message_t message) 124 { 125 struct usb_hcd *hcd = platform_get_drvdata(pdev); 126 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 127 struct spear_ohci *sohci_p = to_spear_ohci(hcd); 128 bool do_wakeup = device_may_wakeup(&pdev->dev); 129 int ret; 130 131 if (time_before(jiffies, ohci->next_statechange)) 132 msleep(5); 133 ohci->next_statechange = jiffies; 134 135 ret = ohci_suspend(hcd, do_wakeup); 136 if (ret) 137 return ret; 138 139 clk_disable_unprepare(sohci_p->clk); 140 141 return ret; 142 } 143 144 static int spear_ohci_hcd_drv_resume(struct platform_device *dev) 145 { 146 struct usb_hcd *hcd = platform_get_drvdata(dev); 147 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 148 struct spear_ohci *sohci_p = to_spear_ohci(hcd); 149 150 if (time_before(jiffies, ohci->next_statechange)) 151 msleep(5); 152 ohci->next_statechange = jiffies; 153 154 clk_prepare_enable(sohci_p->clk); 155 ohci_resume(hcd, false); 156 return 0; 157 } 158 #endif 159 160 static const struct of_device_id spear_ohci_id_table[] = { 161 { .compatible = "st,spear600-ohci", }, 162 { }, 163 }; 164 165 /* Driver definition to register with the platform bus */ 166 static struct platform_driver spear_ohci_hcd_driver = { 167 .probe = spear_ohci_hcd_drv_probe, 168 .remove = spear_ohci_hcd_drv_remove, 169 #ifdef CONFIG_PM 170 .suspend = spear_ohci_hcd_drv_suspend, 171 .resume = spear_ohci_hcd_drv_resume, 172 #endif 173 .driver = { 174 .name = "spear-ohci", 175 .of_match_table = spear_ohci_id_table, 176 }, 177 }; 178 179 static const struct ohci_driver_overrides spear_overrides __initconst = { 180 .extra_priv_size = sizeof(struct spear_ohci), 181 }; 182 static int __init ohci_spear_init(void) 183 { 184 if (usb_disabled()) 185 return -ENODEV; 186 187 pr_info("%s: " DRIVER_DESC "\n", hcd_name); 188 189 ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides); 190 return platform_driver_register(&spear_ohci_hcd_driver); 191 } 192 module_init(ohci_spear_init); 193 194 static void __exit ohci_spear_cleanup(void) 195 { 196 platform_driver_unregister(&spear_ohci_hcd_driver); 197 } 198 module_exit(ohci_spear_cleanup); 199 200 MODULE_DESCRIPTION(DRIVER_DESC); 201 MODULE_AUTHOR("Deepak Sikri"); 202 MODULE_LICENSE("GPL v2"); 203 MODULE_ALIAS("platform:spear-ohci"); 204