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 int ret; 25 26 ehci->caps = hcd->regs; 27 28 ret = ehci_setup(hcd); 29 if (unlikely(ret)) 30 return ret; 31 32 ehci_port_power(ehci, 0); 33 34 return ret; 35 } 36 37 static const struct hc_driver ehci_sh_hc_driver = { 38 .description = hcd_name, 39 .product_desc = "SuperH EHCI", 40 .hcd_priv_size = sizeof(struct ehci_hcd), 41 42 /* 43 * generic hardware linkage 44 */ 45 .irq = ehci_irq, 46 .flags = HCD_USB2 | HCD_MEMORY, 47 48 /* 49 * basic lifecycle operations 50 */ 51 .reset = ehci_sh_reset, 52 .start = ehci_run, 53 .stop = ehci_stop, 54 .shutdown = ehci_shutdown, 55 56 /* 57 * managing i/o requests and associated device resources 58 */ 59 .urb_enqueue = ehci_urb_enqueue, 60 .urb_dequeue = ehci_urb_dequeue, 61 .endpoint_disable = ehci_endpoint_disable, 62 .endpoint_reset = ehci_endpoint_reset, 63 64 /* 65 * scheduling support 66 */ 67 .get_frame_number = ehci_get_frame, 68 69 /* 70 * root hub support 71 */ 72 .hub_status_data = ehci_hub_status_data, 73 .hub_control = ehci_hub_control, 74 75 #ifdef CONFIG_PM 76 .bus_suspend = ehci_bus_suspend, 77 .bus_resume = ehci_bus_resume, 78 #endif 79 80 .relinquish_port = ehci_relinquish_port, 81 .port_handed_over = ehci_port_handed_over, 82 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 83 }; 84 85 static int ehci_hcd_sh_probe(struct platform_device *pdev) 86 { 87 const struct hc_driver *driver = &ehci_sh_hc_driver; 88 struct resource *res; 89 struct ehci_sh_priv *priv; 90 struct ehci_sh_platdata *pdata; 91 struct usb_hcd *hcd; 92 int irq, ret; 93 94 if (usb_disabled()) 95 return -ENODEV; 96 97 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 98 if (!res) { 99 dev_err(&pdev->dev, 100 "Found HC with no register addr. Check %s setup!\n", 101 dev_name(&pdev->dev)); 102 ret = -ENODEV; 103 goto fail_create_hcd; 104 } 105 106 irq = platform_get_irq(pdev, 0); 107 if (irq <= 0) { 108 dev_err(&pdev->dev, 109 "Found HC with no IRQ. Check %s setup!\n", 110 dev_name(&pdev->dev)); 111 ret = -ENODEV; 112 goto fail_create_hcd; 113 } 114 115 pdata = pdev->dev.platform_data; 116 117 /* initialize hcd */ 118 hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev, 119 dev_name(&pdev->dev)); 120 if (!hcd) { 121 ret = -ENOMEM; 122 goto fail_create_hcd; 123 } 124 125 hcd->rsrc_start = res->start; 126 hcd->rsrc_len = resource_size(res); 127 128 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, 129 driver->description)) { 130 dev_dbg(&pdev->dev, "controller already in use\n"); 131 ret = -EBUSY; 132 goto fail_request_resource; 133 } 134 135 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len); 136 if (hcd->regs == NULL) { 137 dev_dbg(&pdev->dev, "error mapping memory\n"); 138 ret = -ENXIO; 139 goto fail_ioremap; 140 } 141 142 priv = kmalloc(sizeof(struct ehci_sh_priv), GFP_KERNEL); 143 if (!priv) { 144 dev_dbg(&pdev->dev, "error allocating priv data\n"); 145 ret = -ENOMEM; 146 goto fail_alloc; 147 } 148 149 /* These are optional, we don't care if they fail */ 150 priv->fclk = clk_get(&pdev->dev, "usb_fck"); 151 if (IS_ERR(priv->fclk)) 152 priv->fclk = NULL; 153 154 priv->iclk = clk_get(&pdev->dev, "usb_ick"); 155 if (IS_ERR(priv->iclk)) 156 priv->iclk = NULL; 157 158 clk_enable(priv->fclk); 159 clk_enable(priv->iclk); 160 161 if (pdata && pdata->phy_init) 162 pdata->phy_init(); 163 164 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 165 if (ret != 0) { 166 dev_err(&pdev->dev, "Failed to add hcd"); 167 goto fail_add_hcd; 168 } 169 170 priv->hcd = hcd; 171 platform_set_drvdata(pdev, priv); 172 173 return ret; 174 175 fail_add_hcd: 176 clk_disable(priv->iclk); 177 clk_disable(priv->fclk); 178 179 clk_put(priv->iclk); 180 clk_put(priv->fclk); 181 182 kfree(priv); 183 fail_alloc: 184 iounmap(hcd->regs); 185 fail_ioremap: 186 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 187 fail_request_resource: 188 usb_put_hcd(hcd); 189 fail_create_hcd: 190 dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret); 191 192 return ret; 193 } 194 195 static int __exit ehci_hcd_sh_remove(struct platform_device *pdev) 196 { 197 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 198 struct usb_hcd *hcd = priv->hcd; 199 200 usb_remove_hcd(hcd); 201 iounmap(hcd->regs); 202 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 203 usb_put_hcd(hcd); 204 platform_set_drvdata(pdev, NULL); 205 206 clk_disable(priv->fclk); 207 clk_disable(priv->iclk); 208 209 clk_put(priv->fclk); 210 clk_put(priv->iclk); 211 212 kfree(priv); 213 214 return 0; 215 } 216 217 static void ehci_hcd_sh_shutdown(struct platform_device *pdev) 218 { 219 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 220 struct usb_hcd *hcd = priv->hcd; 221 222 if (hcd->driver->shutdown) 223 hcd->driver->shutdown(hcd); 224 } 225 226 static struct platform_driver ehci_hcd_sh_driver = { 227 .probe = ehci_hcd_sh_probe, 228 .remove = __exit_p(ehci_hcd_sh_remove), 229 .shutdown = ehci_hcd_sh_shutdown, 230 .driver = { 231 .name = "sh_ehci", 232 .owner = THIS_MODULE, 233 }, 234 }; 235 236 MODULE_ALIAS("platform:sh_ehci"); 237