1 /* 2 * Driver for EHCI HCD on SPEAr SOC 3 * 4 * Copyright (C) 2010 ST Micro Electronics, 5 * Deepak Sikri <deepak.sikri@st.com> 6 * 7 * Based on various ehci-*.c drivers 8 * 9 * This file is subject to the terms and conditions of the GNU General Public 10 * License. See the file COPYING in the main directory of this archive for 11 * more details. 12 */ 13 14 #include <linux/clk.h> 15 #include <linux/dma-mapping.h> 16 #include <linux/io.h> 17 #include <linux/jiffies.h> 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 #include <linux/of.h> 21 #include <linux/platform_device.h> 22 #include <linux/pm.h> 23 #include <linux/usb.h> 24 #include <linux/usb/hcd.h> 25 26 #include "ehci.h" 27 28 #define DRIVER_DESC "EHCI SPEAr driver" 29 30 static const char hcd_name[] = "SPEAr-ehci"; 31 32 struct spear_ehci { 33 struct clk *clk; 34 }; 35 36 #define to_spear_ehci(hcd) (struct spear_ehci *)(hcd_to_ehci(hcd)->priv) 37 38 static struct hc_driver __read_mostly ehci_spear_hc_driver; 39 40 #ifdef CONFIG_PM_SLEEP 41 static int ehci_spear_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_spear_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_spear_pm_ops, ehci_spear_drv_suspend, 59 ehci_spear_drv_resume); 60 61 static int spear_ehci_hcd_drv_probe(struct platform_device *pdev) 62 { 63 struct usb_hcd *hcd ; 64 struct spear_ehci *sehci; 65 struct resource *res; 66 struct clk *usbh_clk; 67 const struct hc_driver *driver = &ehci_spear_hc_driver; 68 int irq, retval; 69 70 if (usb_disabled()) 71 return -ENODEV; 72 73 irq = platform_get_irq(pdev, 0); 74 if (irq < 0) { 75 retval = irq; 76 goto fail; 77 } 78 79 /* 80 * Right now device-tree probed devices don't get dma_mask set. 81 * Since shared usb code relies on it, set it here for now. 82 * Once we have dma capability bindings this can go away. 83 */ 84 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 85 if (retval) 86 goto fail; 87 88 usbh_clk = devm_clk_get(&pdev->dev, NULL); 89 if (IS_ERR(usbh_clk)) { 90 dev_err(&pdev->dev, "Error getting interface clock\n"); 91 retval = PTR_ERR(usbh_clk); 92 goto fail; 93 } 94 95 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); 96 if (!hcd) { 97 retval = -ENOMEM; 98 goto fail; 99 } 100 101 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 102 if (!res) { 103 retval = -ENODEV; 104 goto err_put_hcd; 105 } 106 107 hcd->rsrc_start = res->start; 108 hcd->rsrc_len = resource_size(res); 109 if (!devm_request_mem_region(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len, 110 driver->description)) { 111 retval = -EBUSY; 112 goto err_put_hcd; 113 } 114 115 hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len); 116 if (hcd->regs == NULL) { 117 dev_dbg(&pdev->dev, "error mapping memory\n"); 118 retval = -ENOMEM; 119 goto err_put_hcd; 120 } 121 122 sehci = to_spear_ehci(hcd); 123 sehci->clk = usbh_clk; 124 125 /* registers start at offset 0x0 */ 126 hcd_to_ehci(hcd)->caps = hcd->regs; 127 128 clk_prepare_enable(sehci->clk); 129 retval = usb_add_hcd(hcd, irq, IRQF_SHARED); 130 if (retval) 131 goto err_stop_ehci; 132 133 device_wakeup_enable(hcd->self.controller); 134 return retval; 135 136 err_stop_ehci: 137 clk_disable_unprepare(sehci->clk); 138 err_put_hcd: 139 usb_put_hcd(hcd); 140 fail: 141 dev_err(&pdev->dev, "init fail, %d\n", retval); 142 143 return retval ; 144 } 145 146 static int spear_ehci_hcd_drv_remove(struct platform_device *pdev) 147 { 148 struct usb_hcd *hcd = platform_get_drvdata(pdev); 149 struct spear_ehci *sehci = to_spear_ehci(hcd); 150 151 usb_remove_hcd(hcd); 152 153 if (sehci->clk) 154 clk_disable_unprepare(sehci->clk); 155 usb_put_hcd(hcd); 156 157 return 0; 158 } 159 160 static struct of_device_id spear_ehci_id_table[] = { 161 { .compatible = "st,spear600-ehci", }, 162 { }, 163 }; 164 165 static struct platform_driver spear_ehci_hcd_driver = { 166 .probe = spear_ehci_hcd_drv_probe, 167 .remove = spear_ehci_hcd_drv_remove, 168 .shutdown = usb_hcd_platform_shutdown, 169 .driver = { 170 .name = "spear-ehci", 171 .bus = &platform_bus_type, 172 .pm = &ehci_spear_pm_ops, 173 .of_match_table = spear_ehci_id_table, 174 } 175 }; 176 177 static const struct ehci_driver_overrides spear_overrides __initdata = { 178 .extra_priv_size = sizeof(struct spear_ehci), 179 }; 180 181 static int __init ehci_spear_init(void) 182 { 183 if (usb_disabled()) 184 return -ENODEV; 185 186 pr_info("%s: " DRIVER_DESC "\n", hcd_name); 187 188 ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides); 189 return platform_driver_register(&spear_ehci_hcd_driver); 190 } 191 module_init(ehci_spear_init); 192 193 static void __exit ehci_spear_cleanup(void) 194 { 195 platform_driver_unregister(&spear_ehci_hcd_driver); 196 } 197 module_exit(ehci_spear_cleanup); 198 199 MODULE_DESCRIPTION(DRIVER_DESC); 200 MODULE_ALIAS("platform:spear-ehci"); 201 MODULE_AUTHOR("Deepak Sikri"); 202 MODULE_LICENSE("GPL"); 203