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 ehci->regs = hcd->regs + HC_LENGTH(ehci, ehci_readl(ehci, 28 &ehci->caps->hc_capbase)); 29 30 dbg_hcs_params(ehci, "reset"); 31 dbg_hcc_params(ehci, "reset"); 32 33 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); 34 35 ret = ehci_halt(ehci); 36 if (unlikely(ret)) 37 return ret; 38 39 ret = ehci_init(hcd); 40 if (unlikely(ret)) 41 return ret; 42 43 ehci->sbrn = 0x20; 44 45 ehci_reset(ehci); 46 ehci_port_power(ehci, 0); 47 48 return ret; 49 } 50 51 static const struct hc_driver ehci_sh_hc_driver = { 52 .description = hcd_name, 53 .product_desc = "SuperH EHCI", 54 .hcd_priv_size = sizeof(struct ehci_hcd), 55 56 /* 57 * generic hardware linkage 58 */ 59 .irq = ehci_irq, 60 .flags = HCD_USB2 | HCD_MEMORY, 61 62 /* 63 * basic lifecycle operations 64 */ 65 .reset = ehci_sh_reset, 66 .start = ehci_run, 67 .stop = ehci_stop, 68 .shutdown = ehci_shutdown, 69 70 /* 71 * managing i/o requests and associated device resources 72 */ 73 .urb_enqueue = ehci_urb_enqueue, 74 .urb_dequeue = ehci_urb_dequeue, 75 .endpoint_disable = ehci_endpoint_disable, 76 .endpoint_reset = ehci_endpoint_reset, 77 78 /* 79 * scheduling support 80 */ 81 .get_frame_number = ehci_get_frame, 82 83 /* 84 * root hub support 85 */ 86 .hub_status_data = ehci_hub_status_data, 87 .hub_control = ehci_hub_control, 88 89 #ifdef CONFIG_PM 90 .bus_suspend = ehci_bus_suspend, 91 .bus_resume = ehci_bus_resume, 92 #endif 93 94 .relinquish_port = ehci_relinquish_port, 95 .port_handed_over = ehci_port_handed_over, 96 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 97 }; 98 99 static int ehci_hcd_sh_probe(struct platform_device *pdev) 100 { 101 const struct hc_driver *driver = &ehci_sh_hc_driver; 102 struct resource *res; 103 struct ehci_sh_priv *priv; 104 struct ehci_sh_platdata *pdata; 105 struct usb_hcd *hcd; 106 int irq, ret; 107 108 if (usb_disabled()) 109 return -ENODEV; 110 111 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 112 if (!res) { 113 dev_err(&pdev->dev, 114 "Found HC with no register addr. Check %s setup!\n", 115 dev_name(&pdev->dev)); 116 ret = -ENODEV; 117 goto fail_create_hcd; 118 } 119 120 irq = platform_get_irq(pdev, 0); 121 if (irq <= 0) { 122 dev_err(&pdev->dev, 123 "Found HC with no IRQ. Check %s setup!\n", 124 dev_name(&pdev->dev)); 125 ret = -ENODEV; 126 goto fail_create_hcd; 127 } 128 129 if (pdev->dev.platform_data != NULL) 130 pdata = pdev->dev.platform_data; 131 132 /* initialize hcd */ 133 hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev, 134 dev_name(&pdev->dev)); 135 if (!hcd) { 136 ret = -ENOMEM; 137 goto fail_create_hcd; 138 } 139 140 hcd->rsrc_start = res->start; 141 hcd->rsrc_len = resource_size(res); 142 143 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, 144 driver->description)) { 145 dev_dbg(&pdev->dev, "controller already in use\n"); 146 ret = -EBUSY; 147 goto fail_request_resource; 148 } 149 150 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len); 151 if (hcd->regs == NULL) { 152 dev_dbg(&pdev->dev, "error mapping memory\n"); 153 ret = -ENXIO; 154 goto fail_ioremap; 155 } 156 157 priv = kmalloc(sizeof(struct ehci_sh_priv), GFP_KERNEL); 158 if (!priv) { 159 dev_dbg(&pdev->dev, "error allocating priv data\n"); 160 ret = -ENOMEM; 161 goto fail_alloc; 162 } 163 164 /* These are optional, we don't care if they fail */ 165 priv->fclk = clk_get(&pdev->dev, "usb_fck"); 166 if (IS_ERR(priv->fclk)) 167 priv->fclk = NULL; 168 169 priv->iclk = clk_get(&pdev->dev, "usb_ick"); 170 if (IS_ERR(priv->iclk)) 171 priv->iclk = NULL; 172 173 clk_enable(priv->fclk); 174 clk_enable(priv->iclk); 175 176 if (pdata && pdata->phy_init) 177 pdata->phy_init(); 178 179 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 180 if (ret != 0) { 181 dev_err(&pdev->dev, "Failed to add hcd"); 182 goto fail_add_hcd; 183 } 184 185 priv->hcd = hcd; 186 platform_set_drvdata(pdev, priv); 187 188 return ret; 189 190 fail_add_hcd: 191 clk_disable(priv->iclk); 192 clk_disable(priv->fclk); 193 194 clk_put(priv->iclk); 195 clk_put(priv->fclk); 196 197 kfree(priv); 198 fail_alloc: 199 iounmap(hcd->regs); 200 fail_ioremap: 201 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 202 fail_request_resource: 203 usb_put_hcd(hcd); 204 fail_create_hcd: 205 dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret); 206 207 return ret; 208 } 209 210 static int __exit ehci_hcd_sh_remove(struct platform_device *pdev) 211 { 212 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 213 struct usb_hcd *hcd = priv->hcd; 214 215 usb_remove_hcd(hcd); 216 iounmap(hcd->regs); 217 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 218 usb_put_hcd(hcd); 219 platform_set_drvdata(pdev, NULL); 220 221 clk_disable(priv->fclk); 222 clk_disable(priv->iclk); 223 224 clk_put(priv->fclk); 225 clk_put(priv->iclk); 226 227 kfree(priv); 228 229 return 0; 230 } 231 232 static void ehci_hcd_sh_shutdown(struct platform_device *pdev) 233 { 234 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 235 struct usb_hcd *hcd = priv->hcd; 236 237 if (hcd->driver->shutdown) 238 hcd->driver->shutdown(hcd); 239 } 240 241 static struct platform_driver ehci_hcd_sh_driver = { 242 .probe = ehci_hcd_sh_probe, 243 .remove = __exit_p(ehci_hcd_sh_remove), 244 .shutdown = ehci_hcd_sh_shutdown, 245 .driver = { 246 .name = "sh_ehci", 247 .owner = THIS_MODULE, 248 }, 249 }; 250 251 MODULE_ALIAS("platform:sh_ehci"); 252