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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 | /* * Driver for EHCI HCD on SPEAr SOC * * Copyright (C) 2010 ST Micro Electronics, * Deepak Sikri <deepak.sikri@st.com> * * Based on various ehci-*.c drivers * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive for * more details. */ #include <linux/clk.h> #include <linux/dma-mapping.h> #include <linux/io.h> #include <linux/jiffies.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pm.h> #include <linux/usb.h> #include <linux/usb/hcd.h> #include "ehci.h" #define DRIVER_DESC "EHCI SPEAr driver" static const char hcd_name[] = "SPEAr-ehci"; struct spear_ehci { struct clk *clk; }; #define to_spear_ehci(hcd) (struct spear_ehci *)(hcd_to_ehci(hcd)->priv) static struct hc_driver __read_mostly ehci_spear_hc_driver; #ifdef CONFIG_PM_SLEEP static int ehci_spear_drv_suspend(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); bool do_wakeup = device_may_wakeup(dev); return ehci_suspend(hcd, do_wakeup); } static int ehci_spear_drv_resume(struct device *dev) { struct usb_hcd *hcd = dev_get_drvdata(dev); ehci_resume(hcd, false); return 0; } #endif /* CONFIG_PM_SLEEP */ static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend, ehci_spear_drv_resume); static int spear_ehci_hcd_drv_probe(struct platform_device *pdev) { struct usb_hcd *hcd ; struct spear_ehci *sehci; struct resource *res; struct clk *usbh_clk; const struct hc_driver *driver = &ehci_spear_hc_driver; int irq, retval; if (usb_disabled()) return -ENODEV; irq = platform_get_irq(pdev, 0); if (irq < 0) { retval = irq; goto fail; } /* * Right now device-tree probed devices don't get dma_mask set. * Since shared usb code relies on it, set it here for now. * Once we have dma capability bindings this can go away. */ retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); if (retval) goto fail; usbh_clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(usbh_clk)) { dev_err(&pdev->dev, "Error getting interface clock\n"); retval = PTR_ERR(usbh_clk); goto fail; } hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); if (!hcd) { retval = -ENOMEM; goto fail; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { retval = -ENODEV; goto err_put_hcd; } hcd->rsrc_start = res->start; hcd->rsrc_len = resource_size(res); hcd->regs = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(hcd->regs)) { retval = PTR_ERR(hcd->regs); goto err_put_hcd; } sehci = to_spear_ehci(hcd); sehci->clk = usbh_clk; /* registers start at offset 0x0 */ hcd_to_ehci(hcd)->caps = hcd->regs; clk_prepare_enable(sehci->clk); retval = usb_add_hcd(hcd, irq, IRQF_SHARED); if (retval) goto err_stop_ehci; device_wakeup_enable(hcd->self.controller); return retval; err_stop_ehci: clk_disable_unprepare(sehci->clk); err_put_hcd: usb_put_hcd(hcd); fail: dev_err(&pdev->dev, "init fail, %d\n", retval); return retval ; } static int spear_ehci_hcd_drv_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct spear_ehci *sehci = to_spear_ehci(hcd); usb_remove_hcd(hcd); if (sehci->clk) clk_disable_unprepare(sehci->clk); usb_put_hcd(hcd); return 0; } static const struct of_device_id spear_ehci_id_table[] = { { .compatible = "st,spear600-ehci", }, { }, }; static struct platform_driver spear_ehci_hcd_driver = { .probe = spear_ehci_hcd_drv_probe, .remove = spear_ehci_hcd_drv_remove, .shutdown = usb_hcd_platform_shutdown, .driver = { .name = "spear-ehci", .bus = &platform_bus_type, .pm = &ehci_spear_pm_ops, .of_match_table = spear_ehci_id_table, } }; static const struct ehci_driver_overrides spear_overrides __initdata = { .extra_priv_size = sizeof(struct spear_ehci), }; static int __init ehci_spear_init(void) { if (usb_disabled()) return -ENODEV; pr_info("%s: " DRIVER_DESC "\n", hcd_name); ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides); return platform_driver_register(&spear_ehci_hcd_driver); } module_init(ehci_spear_init); static void __exit ehci_spear_cleanup(void) { platform_driver_unregister(&spear_ehci_hcd_driver); } module_exit(ehci_spear_cleanup); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_ALIAS("platform:spear-ehci"); MODULE_AUTHOR("Deepak Sikri"); MODULE_LICENSE("GPL"); |