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_request_and_ioremap(&pdev->dev, res); 122 if (hcd->regs == NULL) { 123 dev_dbg(&pdev->dev, "error mapping memory\n"); 124 ret = -ENXIO; 125 goto fail_request_resource; 126 } 127 128 priv = devm_kzalloc(&pdev->dev, sizeof(struct ehci_sh_priv), 129 GFP_KERNEL); 130 if (!priv) { 131 dev_dbg(&pdev->dev, "error allocating priv data\n"); 132 ret = -ENOMEM; 133 goto fail_request_resource; 134 } 135 136 /* These are optional, we don't care if they fail */ 137 priv->fclk = devm_clk_get(&pdev->dev, "usb_fck"); 138 if (IS_ERR(priv->fclk)) 139 priv->fclk = NULL; 140 141 priv->iclk = devm_clk_get(&pdev->dev, "usb_ick"); 142 if (IS_ERR(priv->iclk)) 143 priv->iclk = NULL; 144 145 clk_enable(priv->fclk); 146 clk_enable(priv->iclk); 147 148 if (pdata && pdata->phy_init) 149 pdata->phy_init(); 150 151 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 152 if (ret != 0) { 153 dev_err(&pdev->dev, "Failed to add hcd"); 154 goto fail_add_hcd; 155 } 156 157 priv->hcd = hcd; 158 platform_set_drvdata(pdev, priv); 159 160 return ret; 161 162 fail_add_hcd: 163 clk_disable(priv->iclk); 164 clk_disable(priv->fclk); 165 166 fail_request_resource: 167 usb_put_hcd(hcd); 168 fail_create_hcd: 169 dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret); 170 171 return ret; 172 } 173 174 static int __exit ehci_hcd_sh_remove(struct platform_device *pdev) 175 { 176 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 177 struct usb_hcd *hcd = priv->hcd; 178 179 usb_remove_hcd(hcd); 180 usb_put_hcd(hcd); 181 platform_set_drvdata(pdev, NULL); 182 183 clk_disable(priv->fclk); 184 clk_disable(priv->iclk); 185 186 return 0; 187 } 188 189 static void ehci_hcd_sh_shutdown(struct platform_device *pdev) 190 { 191 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 192 struct usb_hcd *hcd = priv->hcd; 193 194 if (hcd->driver->shutdown) 195 hcd->driver->shutdown(hcd); 196 } 197 198 static struct platform_driver ehci_hcd_sh_driver = { 199 .probe = ehci_hcd_sh_probe, 200 .remove = __exit_p(ehci_hcd_sh_remove), 201 .shutdown = ehci_hcd_sh_shutdown, 202 .driver = { 203 .name = "sh_ehci", 204 .owner = THIS_MODULE, 205 }, 206 }; 207 208 MODULE_ALIAS("platform:sh_ehci"); 209