1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * SuperH EHCI host controller driver 4 * 5 * Copyright (C) 2010 Paul Mundt 6 * 7 * Based on ohci-sh.c and ehci-atmel.c. 8 */ 9 #include <linux/platform_device.h> 10 #include <linux/clk.h> 11 12 struct ehci_sh_priv { 13 struct clk *iclk, *fclk; 14 struct usb_hcd *hcd; 15 }; 16 17 static int ehci_sh_reset(struct usb_hcd *hcd) 18 { 19 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 20 21 ehci->caps = hcd->regs; 22 23 return ehci_setup(hcd); 24 } 25 26 static const struct hc_driver ehci_sh_hc_driver = { 27 .description = hcd_name, 28 .product_desc = "SuperH EHCI", 29 .hcd_priv_size = sizeof(struct ehci_hcd), 30 31 /* 32 * generic hardware linkage 33 */ 34 .irq = ehci_irq, 35 .flags = HCD_USB2 | HCD_DMA | HCD_MEMORY | HCD_BH, 36 37 /* 38 * basic lifecycle operations 39 */ 40 .reset = ehci_sh_reset, 41 .start = ehci_run, 42 .stop = ehci_stop, 43 .shutdown = ehci_shutdown, 44 45 /* 46 * managing i/o requests and associated device resources 47 */ 48 .urb_enqueue = ehci_urb_enqueue, 49 .urb_dequeue = ehci_urb_dequeue, 50 .endpoint_disable = ehci_endpoint_disable, 51 .endpoint_reset = ehci_endpoint_reset, 52 53 /* 54 * scheduling support 55 */ 56 .get_frame_number = ehci_get_frame, 57 58 /* 59 * root hub support 60 */ 61 .hub_status_data = ehci_hub_status_data, 62 .hub_control = ehci_hub_control, 63 64 #ifdef CONFIG_PM 65 .bus_suspend = ehci_bus_suspend, 66 .bus_resume = ehci_bus_resume, 67 #endif 68 69 .relinquish_port = ehci_relinquish_port, 70 .port_handed_over = ehci_port_handed_over, 71 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 72 }; 73 74 static int ehci_hcd_sh_probe(struct platform_device *pdev) 75 { 76 struct resource *res; 77 struct ehci_sh_priv *priv; 78 struct usb_hcd *hcd; 79 int irq, ret; 80 81 if (usb_disabled()) 82 return -ENODEV; 83 84 irq = platform_get_irq(pdev, 0); 85 if (irq < 0) { 86 ret = irq; 87 goto fail_create_hcd; 88 } 89 90 /* initialize hcd */ 91 hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev, 92 dev_name(&pdev->dev)); 93 if (!hcd) { 94 ret = -ENOMEM; 95 goto fail_create_hcd; 96 } 97 98 hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 99 if (IS_ERR(hcd->regs)) { 100 ret = PTR_ERR(hcd->regs); 101 goto fail_request_resource; 102 } 103 hcd->rsrc_start = res->start; 104 hcd->rsrc_len = resource_size(res); 105 106 priv = devm_kzalloc(&pdev->dev, sizeof(struct ehci_sh_priv), 107 GFP_KERNEL); 108 if (!priv) { 109 ret = -ENOMEM; 110 goto fail_request_resource; 111 } 112 113 /* These are optional, we don't care if they fail */ 114 priv->fclk = devm_clk_get(&pdev->dev, "usb_fck"); 115 if (IS_ERR(priv->fclk)) 116 priv->fclk = NULL; 117 118 priv->iclk = devm_clk_get(&pdev->dev, "usb_ick"); 119 if (IS_ERR(priv->iclk)) 120 priv->iclk = NULL; 121 122 clk_enable(priv->fclk); 123 clk_enable(priv->iclk); 124 125 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 126 if (ret != 0) { 127 dev_err(&pdev->dev, "Failed to add hcd"); 128 goto fail_add_hcd; 129 } 130 device_wakeup_enable(hcd->self.controller); 131 132 priv->hcd = hcd; 133 platform_set_drvdata(pdev, priv); 134 135 return ret; 136 137 fail_add_hcd: 138 clk_disable(priv->iclk); 139 clk_disable(priv->fclk); 140 141 fail_request_resource: 142 usb_put_hcd(hcd); 143 fail_create_hcd: 144 dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret); 145 146 return ret; 147 } 148 149 static void ehci_hcd_sh_remove(struct platform_device *pdev) 150 { 151 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 152 struct usb_hcd *hcd = priv->hcd; 153 154 usb_remove_hcd(hcd); 155 usb_put_hcd(hcd); 156 157 clk_disable(priv->fclk); 158 clk_disable(priv->iclk); 159 } 160 161 static void ehci_hcd_sh_shutdown(struct platform_device *pdev) 162 { 163 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 164 struct usb_hcd *hcd = priv->hcd; 165 166 if (hcd->driver->shutdown) 167 hcd->driver->shutdown(hcd); 168 } 169 170 static struct platform_driver ehci_hcd_sh_driver = { 171 .probe = ehci_hcd_sh_probe, 172 .remove_new = ehci_hcd_sh_remove, 173 .shutdown = ehci_hcd_sh_shutdown, 174 .driver = { 175 .name = "sh_ehci", 176 }, 177 }; 178 179 MODULE_ALIAS("platform:sh_ehci"); 180