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 pdata = pdev->dev.platform_data; 130 131 /* initialize hcd */ 132 hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev, 133 dev_name(&pdev->dev)); 134 if (!hcd) { 135 ret = -ENOMEM; 136 goto fail_create_hcd; 137 } 138 139 hcd->rsrc_start = res->start; 140 hcd->rsrc_len = resource_size(res); 141 142 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, 143 driver->description)) { 144 dev_dbg(&pdev->dev, "controller already in use\n"); 145 ret = -EBUSY; 146 goto fail_request_resource; 147 } 148 149 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len); 150 if (hcd->regs == NULL) { 151 dev_dbg(&pdev->dev, "error mapping memory\n"); 152 ret = -ENXIO; 153 goto fail_ioremap; 154 } 155 156 priv = kmalloc(sizeof(struct ehci_sh_priv), GFP_KERNEL); 157 if (!priv) { 158 dev_dbg(&pdev->dev, "error allocating priv data\n"); 159 ret = -ENOMEM; 160 goto fail_alloc; 161 } 162 163 /* These are optional, we don't care if they fail */ 164 priv->fclk = clk_get(&pdev->dev, "usb_fck"); 165 if (IS_ERR(priv->fclk)) 166 priv->fclk = NULL; 167 168 priv->iclk = clk_get(&pdev->dev, "usb_ick"); 169 if (IS_ERR(priv->iclk)) 170 priv->iclk = NULL; 171 172 clk_enable(priv->fclk); 173 clk_enable(priv->iclk); 174 175 if (pdata && pdata->phy_init) 176 pdata->phy_init(); 177 178 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 179 if (ret != 0) { 180 dev_err(&pdev->dev, "Failed to add hcd"); 181 goto fail_add_hcd; 182 } 183 184 priv->hcd = hcd; 185 platform_set_drvdata(pdev, priv); 186 187 return ret; 188 189 fail_add_hcd: 190 clk_disable(priv->iclk); 191 clk_disable(priv->fclk); 192 193 clk_put(priv->iclk); 194 clk_put(priv->fclk); 195 196 kfree(priv); 197 fail_alloc: 198 iounmap(hcd->regs); 199 fail_ioremap: 200 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 201 fail_request_resource: 202 usb_put_hcd(hcd); 203 fail_create_hcd: 204 dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret); 205 206 return ret; 207 } 208 209 static int __exit ehci_hcd_sh_remove(struct platform_device *pdev) 210 { 211 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 212 struct usb_hcd *hcd = priv->hcd; 213 214 usb_remove_hcd(hcd); 215 iounmap(hcd->regs); 216 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 217 usb_put_hcd(hcd); 218 platform_set_drvdata(pdev, NULL); 219 220 clk_disable(priv->fclk); 221 clk_disable(priv->iclk); 222 223 clk_put(priv->fclk); 224 clk_put(priv->iclk); 225 226 kfree(priv); 227 228 return 0; 229 } 230 231 static void ehci_hcd_sh_shutdown(struct platform_device *pdev) 232 { 233 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 234 struct usb_hcd *hcd = priv->hcd; 235 236 if (hcd->driver->shutdown) 237 hcd->driver->shutdown(hcd); 238 } 239 240 static struct platform_driver ehci_hcd_sh_driver = { 241 .probe = ehci_hcd_sh_probe, 242 .remove = __exit_p(ehci_hcd_sh_remove), 243 .shutdown = ehci_hcd_sh_shutdown, 244 .driver = { 245 .name = "sh_ehci", 246 .owner = THIS_MODULE, 247 }, 248 }; 249 250 MODULE_ALIAS("platform:sh_ehci"); 251