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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 | /* * OHCI HCD (Host Controller Driver) for USB. * * Copyright (C) 2010 ST Microelectronics. * Deepak Sikri<deepak.sikri@st.com> * * Based on various ohci-*.c drivers * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #include <linux/clk.h> #include <linux/dma-mapping.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/signal.h> #include <linux/usb.h> #include <linux/usb/hcd.h> #include "ohci.h" #define DRIVER_DESC "OHCI SPEAr driver" static const char hcd_name[] = "SPEAr-ohci"; struct spear_ohci { struct clk *clk; }; #define to_spear_ohci(hcd) (struct spear_ohci *)(hcd_to_ohci(hcd)->priv) static struct hc_driver __read_mostly ohci_spear_hc_driver; static int spear_ohci_hcd_drv_probe(struct platform_device *pdev) { const struct hc_driver *driver = &ohci_spear_hc_driver; struct ohci_hcd *ohci; struct usb_hcd *hcd = NULL; struct clk *usbh_clk; struct spear_ohci *sohci_p; struct resource *res; int retval, irq; 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); hcd->regs = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(hcd->regs)) { retval = PTR_ERR(hcd->regs); goto err_put_hcd; } hcd->rsrc_start = pdev->resource[0].start; hcd->rsrc_len = resource_size(res); sohci_p = to_spear_ohci(hcd); sohci_p->clk = usbh_clk; clk_prepare_enable(sohci_p->clk); ohci = hcd_to_ohci(hcd); retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0); if (retval == 0) { device_wakeup_enable(hcd->self.controller); return retval; } clk_disable_unprepare(sohci_p->clk); err_put_hcd: usb_put_hcd(hcd); fail: dev_err(&pdev->dev, "init fail, %d\n", retval); return retval; } static int spear_ohci_hcd_drv_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct spear_ohci *sohci_p = to_spear_ohci(hcd); usb_remove_hcd(hcd); if (sohci_p->clk) clk_disable_unprepare(sohci_p->clk); usb_put_hcd(hcd); return 0; } #if defined(CONFIG_PM) static int spear_ohci_hcd_drv_suspend(struct platform_device *pdev, pm_message_t message) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct ohci_hcd *ohci = hcd_to_ohci(hcd); struct spear_ohci *sohci_p = to_spear_ohci(hcd); bool do_wakeup = device_may_wakeup(&pdev->dev); int ret; if (time_before(jiffies, ohci->next_statechange)) msleep(5); ohci->next_statechange = jiffies; ret = ohci_suspend(hcd, do_wakeup); if (ret) return ret; clk_disable_unprepare(sohci_p->clk); return ret; } static int spear_ohci_hcd_drv_resume(struct platform_device *dev) { struct usb_hcd *hcd = platform_get_drvdata(dev); struct ohci_hcd *ohci = hcd_to_ohci(hcd); struct spear_ohci *sohci_p = to_spear_ohci(hcd); if (time_before(jiffies, ohci->next_statechange)) msleep(5); ohci->next_statechange = jiffies; clk_prepare_enable(sohci_p->clk); ohci_resume(hcd, false); return 0; } #endif static const struct of_device_id spear_ohci_id_table[] = { { .compatible = "st,spear600-ohci", }, { }, }; /* Driver definition to register with the platform bus */ static struct platform_driver spear_ohci_hcd_driver = { .probe = spear_ohci_hcd_drv_probe, .remove = spear_ohci_hcd_drv_remove, #ifdef CONFIG_PM .suspend = spear_ohci_hcd_drv_suspend, .resume = spear_ohci_hcd_drv_resume, #endif .driver = { .name = "spear-ohci", .of_match_table = spear_ohci_id_table, }, }; static const struct ohci_driver_overrides spear_overrides __initconst = { .extra_priv_size = sizeof(struct spear_ohci), }; static int __init ohci_spear_init(void) { if (usb_disabled()) return -ENODEV; pr_info("%s: " DRIVER_DESC "\n", hcd_name); ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides); return platform_driver_register(&spear_ohci_hcd_driver); } module_init(ohci_spear_init); static void __exit ohci_spear_cleanup(void) { platform_driver_unregister(&spear_ohci_hcd_driver); } module_exit(ohci_spear_cleanup); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_AUTHOR("Deepak Sikri"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:spear-ohci"); |