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 = -ENODEV; 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 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 99 hcd->regs = devm_ioremap_resource(&pdev->dev, res); 100 if (IS_ERR(hcd->regs)) { 101 ret = PTR_ERR(hcd->regs); 102 goto fail_request_resource; 103 } 104 hcd->rsrc_start = res->start; 105 hcd->rsrc_len = resource_size(res); 106 107 priv = devm_kzalloc(&pdev->dev, sizeof(struct ehci_sh_priv), 108 GFP_KERNEL); 109 if (!priv) { 110 ret = -ENOMEM; 111 goto fail_request_resource; 112 } 113 114 /* These are optional, we don't care if they fail */ 115 priv->fclk = devm_clk_get(&pdev->dev, "usb_fck"); 116 if (IS_ERR(priv->fclk)) 117 priv->fclk = NULL; 118 119 priv->iclk = devm_clk_get(&pdev->dev, "usb_ick"); 120 if (IS_ERR(priv->iclk)) 121 priv->iclk = NULL; 122 123 clk_enable(priv->fclk); 124 clk_enable(priv->iclk); 125 126 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 127 if (ret != 0) { 128 dev_err(&pdev->dev, "Failed to add hcd"); 129 goto fail_add_hcd; 130 } 131 device_wakeup_enable(hcd->self.controller); 132 133 priv->hcd = hcd; 134 platform_set_drvdata(pdev, priv); 135 136 return ret; 137 138 fail_add_hcd: 139 clk_disable(priv->iclk); 140 clk_disable(priv->fclk); 141 142 fail_request_resource: 143 usb_put_hcd(hcd); 144 fail_create_hcd: 145 dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret); 146 147 return ret; 148 } 149 150 static int ehci_hcd_sh_remove(struct platform_device *pdev) 151 { 152 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 153 struct usb_hcd *hcd = priv->hcd; 154 155 usb_remove_hcd(hcd); 156 usb_put_hcd(hcd); 157 158 clk_disable(priv->fclk); 159 clk_disable(priv->iclk); 160 161 return 0; 162 } 163 164 static void ehci_hcd_sh_shutdown(struct platform_device *pdev) 165 { 166 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 167 struct usb_hcd *hcd = priv->hcd; 168 169 if (hcd->driver->shutdown) 170 hcd->driver->shutdown(hcd); 171 } 172 173 static struct platform_driver ehci_hcd_sh_driver = { 174 .probe = ehci_hcd_sh_probe, 175 .remove = ehci_hcd_sh_remove, 176 .shutdown = ehci_hcd_sh_shutdown, 177 .driver = { 178 .name = "sh_ehci", 179 }, 180 }; 181 182 MODULE_ALIAS("platform:sh_ehci"); 183