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 if (!pdev->dev.dma_mask) 85 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; 86 if (!pdev->dev.coherent_dma_mask) 87 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 88 89 usbh_clk = devm_clk_get(&pdev->dev, NULL); 90 if (IS_ERR(usbh_clk)) { 91 dev_err(&pdev->dev, "Error getting interface clock\n"); 92 retval = PTR_ERR(usbh_clk); 93 goto fail; 94 } 95 96 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); 97 if (!hcd) { 98 retval = -ENOMEM; 99 goto fail; 100 } 101 102 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 103 if (!res) { 104 retval = -ENODEV; 105 goto err_put_hcd; 106 } 107 108 hcd->rsrc_start = res->start; 109 hcd->rsrc_len = resource_size(res); 110 if (!devm_request_mem_region(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len, 111 driver->description)) { 112 retval = -EBUSY; 113 goto err_put_hcd; 114 } 115 116 hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len); 117 if (hcd->regs == NULL) { 118 dev_dbg(&pdev->dev, "error mapping memory\n"); 119 retval = -ENOMEM; 120 goto err_put_hcd; 121 } 122 123 sehci = to_spear_ehci(hcd); 124 sehci->clk = usbh_clk; 125 126 /* registers start at offset 0x0 */ 127 hcd_to_ehci(hcd)->caps = hcd->regs; 128 129 clk_prepare_enable(sehci->clk); 130 retval = usb_add_hcd(hcd, irq, IRQF_SHARED); 131 if (retval) 132 goto err_stop_ehci; 133 134 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 if (!hcd) 152 return 0; 153 if (in_interrupt()) 154 BUG(); 155 usb_remove_hcd(hcd); 156 157 if (sehci->clk) 158 clk_disable_unprepare(sehci->clk); 159 usb_put_hcd(hcd); 160 161 return 0; 162 } 163 164 static struct of_device_id spear_ehci_id_table[] = { 165 { .compatible = "st,spear600-ehci", }, 166 { }, 167 }; 168 169 static struct platform_driver spear_ehci_hcd_driver = { 170 .probe = spear_ehci_hcd_drv_probe, 171 .remove = spear_ehci_hcd_drv_remove, 172 .shutdown = usb_hcd_platform_shutdown, 173 .driver = { 174 .name = "spear-ehci", 175 .bus = &platform_bus_type, 176 .pm = &ehci_spear_pm_ops, 177 .of_match_table = of_match_ptr(spear_ehci_id_table), 178 } 179 }; 180 181 static const struct ehci_driver_overrides spear_overrides __initdata = { 182 .extra_priv_size = sizeof(struct spear_ehci), 183 }; 184 185 static int __init ehci_spear_init(void) 186 { 187 if (usb_disabled()) 188 return -ENODEV; 189 190 pr_info("%s: " DRIVER_DESC "\n", hcd_name); 191 192 ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides); 193 return platform_driver_register(&spear_ehci_hcd_driver); 194 } 195 module_init(ehci_spear_init); 196 197 static void __exit ehci_spear_cleanup(void) 198 { 199 platform_driver_unregister(&spear_ehci_hcd_driver); 200 } 201 module_exit(ehci_spear_cleanup); 202 203 MODULE_DESCRIPTION(DRIVER_DESC); 204 MODULE_ALIAS("platform:spear-ehci"); 205 MODULE_AUTHOR("Deepak Sikri"); 206 MODULE_LICENSE("GPL"); 207