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 struct resource *res; 81 struct ehci_sh_priv *priv; 82 struct ehci_sh_platdata *pdata; 83 struct usb_hcd *hcd; 84 int irq, ret; 85 86 if (usb_disabled()) 87 return -ENODEV; 88 89 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 90 if (!res) { 91 dev_err(&pdev->dev, 92 "Found HC with no register addr. Check %s setup!\n", 93 dev_name(&pdev->dev)); 94 ret = -ENODEV; 95 goto fail_create_hcd; 96 } 97 98 irq = platform_get_irq(pdev, 0); 99 if (irq <= 0) { 100 dev_err(&pdev->dev, 101 "Found HC with no IRQ. Check %s setup!\n", 102 dev_name(&pdev->dev)); 103 ret = -ENODEV; 104 goto fail_create_hcd; 105 } 106 107 pdata = dev_get_platdata(&pdev->dev); 108 109 /* initialize hcd */ 110 hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev, 111 dev_name(&pdev->dev)); 112 if (!hcd) { 113 ret = -ENOMEM; 114 goto fail_create_hcd; 115 } 116 117 hcd->rsrc_start = res->start; 118 hcd->rsrc_len = resource_size(res); 119 120 hcd->regs = devm_ioremap_resource(&pdev->dev, res); 121 if (IS_ERR(hcd->regs)) { 122 ret = PTR_ERR(hcd->regs); 123 goto fail_request_resource; 124 } 125 126 priv = devm_kzalloc(&pdev->dev, sizeof(struct ehci_sh_priv), 127 GFP_KERNEL); 128 if (!priv) { 129 dev_dbg(&pdev->dev, "error allocating priv data\n"); 130 ret = -ENOMEM; 131 goto fail_request_resource; 132 } 133 134 /* These are optional, we don't care if they fail */ 135 priv->fclk = devm_clk_get(&pdev->dev, "usb_fck"); 136 if (IS_ERR(priv->fclk)) 137 priv->fclk = NULL; 138 139 priv->iclk = devm_clk_get(&pdev->dev, "usb_ick"); 140 if (IS_ERR(priv->iclk)) 141 priv->iclk = NULL; 142 143 clk_enable(priv->fclk); 144 clk_enable(priv->iclk); 145 146 if (pdata && pdata->phy_init) 147 pdata->phy_init(); 148 149 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 150 if (ret != 0) { 151 dev_err(&pdev->dev, "Failed to add hcd"); 152 goto fail_add_hcd; 153 } 154 155 priv->hcd = hcd; 156 platform_set_drvdata(pdev, priv); 157 158 return ret; 159 160 fail_add_hcd: 161 clk_disable(priv->iclk); 162 clk_disable(priv->fclk); 163 164 fail_request_resource: 165 usb_put_hcd(hcd); 166 fail_create_hcd: 167 dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret); 168 169 return ret; 170 } 171 172 static int ehci_hcd_sh_remove(struct platform_device *pdev) 173 { 174 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 175 struct usb_hcd *hcd = priv->hcd; 176 177 usb_remove_hcd(hcd); 178 usb_put_hcd(hcd); 179 180 clk_disable(priv->fclk); 181 clk_disable(priv->iclk); 182 183 return 0; 184 } 185 186 static void ehci_hcd_sh_shutdown(struct platform_device *pdev) 187 { 188 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 189 struct usb_hcd *hcd = priv->hcd; 190 191 if (hcd->driver->shutdown) 192 hcd->driver->shutdown(hcd); 193 } 194 195 static struct platform_driver ehci_hcd_sh_driver = { 196 .probe = ehci_hcd_sh_probe, 197 .remove = ehci_hcd_sh_remove, 198 .shutdown = ehci_hcd_sh_shutdown, 199 .driver = { 200 .name = "sh_ehci", 201 .owner = THIS_MODULE, 202 }, 203 }; 204 205 MODULE_ALIAS("platform:sh_ehci"); 206