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 #include <linux/platform_data/ehci-sh.h> 12 13 struct ehci_sh_priv { 14 struct clk *iclk, *fclk; 15 struct usb_hcd *hcd; 16 }; 17 18 static int ehci_sh_reset(struct usb_hcd *hcd) 19 { 20 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 21 22 ehci->caps = hcd->regs; 23 24 return ehci_setup(hcd); 25 } 26 27 static const struct hc_driver ehci_sh_hc_driver = { 28 .description = hcd_name, 29 .product_desc = "SuperH EHCI", 30 .hcd_priv_size = sizeof(struct ehci_hcd), 31 32 /* 33 * generic hardware linkage 34 */ 35 .irq = ehci_irq, 36 .flags = HCD_USB2 | HCD_MEMORY | HCD_BH, 37 38 /* 39 * basic lifecycle operations 40 */ 41 .reset = ehci_sh_reset, 42 .start = ehci_run, 43 .stop = ehci_stop, 44 .shutdown = ehci_shutdown, 45 46 /* 47 * managing i/o requests and associated device resources 48 */ 49 .urb_enqueue = ehci_urb_enqueue, 50 .urb_dequeue = ehci_urb_dequeue, 51 .endpoint_disable = ehci_endpoint_disable, 52 .endpoint_reset = ehci_endpoint_reset, 53 54 /* 55 * scheduling support 56 */ 57 .get_frame_number = ehci_get_frame, 58 59 /* 60 * root hub support 61 */ 62 .hub_status_data = ehci_hub_status_data, 63 .hub_control = ehci_hub_control, 64 65 #ifdef CONFIG_PM 66 .bus_suspend = ehci_bus_suspend, 67 .bus_resume = ehci_bus_resume, 68 #endif 69 70 .relinquish_port = ehci_relinquish_port, 71 .port_handed_over = ehci_port_handed_over, 72 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 73 }; 74 75 static int ehci_hcd_sh_probe(struct platform_device *pdev) 76 { 77 struct resource *res; 78 struct ehci_sh_priv *priv; 79 struct ehci_sh_platdata *pdata; 80 struct usb_hcd *hcd; 81 int irq, ret; 82 83 if (usb_disabled()) 84 return -ENODEV; 85 86 irq = platform_get_irq(pdev, 0); 87 if (irq <= 0) { 88 dev_err(&pdev->dev, 89 "Found HC with no IRQ. Check %s setup!\n", 90 dev_name(&pdev->dev)); 91 ret = -ENODEV; 92 goto fail_create_hcd; 93 } 94 95 pdata = dev_get_platdata(&pdev->dev); 96 97 /* initialize hcd */ 98 hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev, 99 dev_name(&pdev->dev)); 100 if (!hcd) { 101 ret = -ENOMEM; 102 goto fail_create_hcd; 103 } 104 105 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 106 hcd->regs = devm_ioremap_resource(&pdev->dev, res); 107 if (IS_ERR(hcd->regs)) { 108 ret = PTR_ERR(hcd->regs); 109 goto fail_request_resource; 110 } 111 hcd->rsrc_start = res->start; 112 hcd->rsrc_len = resource_size(res); 113 114 priv = devm_kzalloc(&pdev->dev, sizeof(struct ehci_sh_priv), 115 GFP_KERNEL); 116 if (!priv) { 117 ret = -ENOMEM; 118 goto fail_request_resource; 119 } 120 121 /* These are optional, we don't care if they fail */ 122 priv->fclk = devm_clk_get(&pdev->dev, "usb_fck"); 123 if (IS_ERR(priv->fclk)) 124 priv->fclk = NULL; 125 126 priv->iclk = devm_clk_get(&pdev->dev, "usb_ick"); 127 if (IS_ERR(priv->iclk)) 128 priv->iclk = NULL; 129 130 clk_enable(priv->fclk); 131 clk_enable(priv->iclk); 132 133 if (pdata && pdata->phy_init) 134 pdata->phy_init(); 135 136 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 137 if (ret != 0) { 138 dev_err(&pdev->dev, "Failed to add hcd"); 139 goto fail_add_hcd; 140 } 141 device_wakeup_enable(hcd->self.controller); 142 143 priv->hcd = hcd; 144 platform_set_drvdata(pdev, priv); 145 146 return ret; 147 148 fail_add_hcd: 149 clk_disable(priv->iclk); 150 clk_disable(priv->fclk); 151 152 fail_request_resource: 153 usb_put_hcd(hcd); 154 fail_create_hcd: 155 dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret); 156 157 return ret; 158 } 159 160 static int ehci_hcd_sh_remove(struct platform_device *pdev) 161 { 162 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 163 struct usb_hcd *hcd = priv->hcd; 164 165 usb_remove_hcd(hcd); 166 usb_put_hcd(hcd); 167 168 clk_disable(priv->fclk); 169 clk_disable(priv->iclk); 170 171 return 0; 172 } 173 174 static void ehci_hcd_sh_shutdown(struct platform_device *pdev) 175 { 176 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 177 struct usb_hcd *hcd = priv->hcd; 178 179 if (hcd->driver->shutdown) 180 hcd->driver->shutdown(hcd); 181 } 182 183 static struct platform_driver ehci_hcd_sh_driver = { 184 .probe = ehci_hcd_sh_probe, 185 .remove = ehci_hcd_sh_remove, 186 .shutdown = ehci_hcd_sh_shutdown, 187 .driver = { 188 .name = "sh_ehci", 189 }, 190 }; 191 192 MODULE_ALIAS("platform:sh_ehci"); 193