1 /* 2 * SuperH EHCI host controller driver 3 * 4 * Copyright (C) 2010 Paul Mundt 5 * 6 * Based on ohci-sh.c and ehci-atmel.c. 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License. See the file "COPYING" in the main directory of this archive 10 * for more details. 11 */ 12 #include <linux/platform_device.h> 13 #include <linux/clk.h> 14 #include <linux/platform_data/ehci-sh.h> 15 16 struct ehci_sh_priv { 17 struct clk *iclk, *fclk; 18 struct usb_hcd *hcd; 19 }; 20 21 static int ehci_sh_reset(struct usb_hcd *hcd) 22 { 23 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 24 25 ehci->caps = hcd->regs; 26 27 return ehci_setup(hcd); 28 } 29 30 static const struct hc_driver ehci_sh_hc_driver = { 31 .description = hcd_name, 32 .product_desc = "SuperH EHCI", 33 .hcd_priv_size = sizeof(struct ehci_hcd), 34 35 /* 36 * generic hardware linkage 37 */ 38 .irq = ehci_irq, 39 .flags = HCD_USB2 | HCD_MEMORY, 40 41 /* 42 * basic lifecycle operations 43 */ 44 .reset = ehci_sh_reset, 45 .start = ehci_run, 46 .stop = ehci_stop, 47 .shutdown = ehci_shutdown, 48 49 /* 50 * managing i/o requests and associated device resources 51 */ 52 .urb_enqueue = ehci_urb_enqueue, 53 .urb_dequeue = ehci_urb_dequeue, 54 .endpoint_disable = ehci_endpoint_disable, 55 .endpoint_reset = ehci_endpoint_reset, 56 57 /* 58 * scheduling support 59 */ 60 .get_frame_number = ehci_get_frame, 61 62 /* 63 * root hub support 64 */ 65 .hub_status_data = ehci_hub_status_data, 66 .hub_control = ehci_hub_control, 67 68 #ifdef CONFIG_PM 69 .bus_suspend = ehci_bus_suspend, 70 .bus_resume = ehci_bus_resume, 71 #endif 72 73 .relinquish_port = ehci_relinquish_port, 74 .port_handed_over = ehci_port_handed_over, 75 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 76 }; 77 78 static int ehci_hcd_sh_probe(struct platform_device *pdev) 79 { 80 const struct hc_driver *driver = &ehci_sh_hc_driver; 81 struct resource *res; 82 struct ehci_sh_priv *priv; 83 struct ehci_sh_platdata *pdata; 84 struct usb_hcd *hcd; 85 int irq, ret; 86 87 if (usb_disabled()) 88 return -ENODEV; 89 90 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 91 if (!res) { 92 dev_err(&pdev->dev, 93 "Found HC with no register addr. Check %s setup!\n", 94 dev_name(&pdev->dev)); 95 ret = -ENODEV; 96 goto fail_create_hcd; 97 } 98 99 irq = platform_get_irq(pdev, 0); 100 if (irq <= 0) { 101 dev_err(&pdev->dev, 102 "Found HC with no IRQ. Check %s setup!\n", 103 dev_name(&pdev->dev)); 104 ret = -ENODEV; 105 goto fail_create_hcd; 106 } 107 108 pdata = pdev->dev.platform_data; 109 110 /* initialize hcd */ 111 hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev, 112 dev_name(&pdev->dev)); 113 if (!hcd) { 114 ret = -ENOMEM; 115 goto fail_create_hcd; 116 } 117 118 hcd->rsrc_start = res->start; 119 hcd->rsrc_len = resource_size(res); 120 121 hcd->regs = devm_ioremap_resource(&pdev->dev, res); 122 if (IS_ERR(hcd->regs)) { 123 ret = PTR_ERR(hcd->regs); 124 goto fail_request_resource; 125 } 126 127 priv = devm_kzalloc(&pdev->dev, sizeof(struct ehci_sh_priv), 128 GFP_KERNEL); 129 if (!priv) { 130 dev_dbg(&pdev->dev, "error allocating priv data\n"); 131 ret = -ENOMEM; 132 goto fail_request_resource; 133 } 134 135 /* These are optional, we don't care if they fail */ 136 priv->fclk = devm_clk_get(&pdev->dev, "usb_fck"); 137 if (IS_ERR(priv->fclk)) 138 priv->fclk = NULL; 139 140 priv->iclk = devm_clk_get(&pdev->dev, "usb_ick"); 141 if (IS_ERR(priv->iclk)) 142 priv->iclk = NULL; 143 144 clk_enable(priv->fclk); 145 clk_enable(priv->iclk); 146 147 if (pdata && pdata->phy_init) 148 pdata->phy_init(); 149 150 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 151 if (ret != 0) { 152 dev_err(&pdev->dev, "Failed to add hcd"); 153 goto fail_add_hcd; 154 } 155 156 priv->hcd = hcd; 157 platform_set_drvdata(pdev, priv); 158 159 return ret; 160 161 fail_add_hcd: 162 clk_disable(priv->iclk); 163 clk_disable(priv->fclk); 164 165 fail_request_resource: 166 usb_put_hcd(hcd); 167 fail_create_hcd: 168 dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret); 169 170 return ret; 171 } 172 173 static int ehci_hcd_sh_remove(struct platform_device *pdev) 174 { 175 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 176 struct usb_hcd *hcd = priv->hcd; 177 178 usb_remove_hcd(hcd); 179 usb_put_hcd(hcd); 180 platform_set_drvdata(pdev, NULL); 181 182 clk_disable(priv->fclk); 183 clk_disable(priv->iclk); 184 185 return 0; 186 } 187 188 static void ehci_hcd_sh_shutdown(struct platform_device *pdev) 189 { 190 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 191 struct usb_hcd *hcd = priv->hcd; 192 193 if (hcd->driver->shutdown) 194 hcd->driver->shutdown(hcd); 195 } 196 197 static struct platform_driver ehci_hcd_sh_driver = { 198 .probe = ehci_hcd_sh_probe, 199 .remove = ehci_hcd_sh_remove, 200 .shutdown = ehci_hcd_sh_shutdown, 201 .driver = { 202 .name = "sh_ehci", 203 .owner = THIS_MODULE, 204 }, 205 }; 206 207 MODULE_ALIAS("platform:sh_ehci"); 208