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 15 struct ehci_sh_priv { 16 struct clk *iclk, *fclk; 17 struct usb_hcd *hcd; 18 }; 19 20 static int ehci_sh_reset(struct usb_hcd *hcd) 21 { 22 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 23 int ret; 24 25 ehci->caps = hcd->regs; 26 ehci->regs = hcd->regs + HC_LENGTH(ehci_readl(ehci, 27 &ehci->caps->hc_capbase)); 28 29 dbg_hcs_params(ehci, "reset"); 30 dbg_hcc_params(ehci, "reset"); 31 32 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); 33 34 ret = ehci_halt(ehci); 35 if (unlikely(ret)) 36 return ret; 37 38 ret = ehci_init(hcd); 39 if (unlikely(ret)) 40 return ret; 41 42 ehci->sbrn = 0x20; 43 44 ehci_reset(ehci); 45 ehci_port_power(ehci, 0); 46 47 return ret; 48 } 49 50 static const struct hc_driver ehci_sh_hc_driver = { 51 .description = hcd_name, 52 .product_desc = "SuperH EHCI", 53 .hcd_priv_size = sizeof(struct ehci_hcd), 54 55 /* 56 * generic hardware linkage 57 */ 58 .irq = ehci_irq, 59 .flags = HCD_USB2 | HCD_MEMORY, 60 61 /* 62 * basic lifecycle operations 63 */ 64 .reset = ehci_sh_reset, 65 .start = ehci_run, 66 .stop = ehci_stop, 67 .shutdown = ehci_shutdown, 68 69 /* 70 * managing i/o requests and associated device resources 71 */ 72 .urb_enqueue = ehci_urb_enqueue, 73 .urb_dequeue = ehci_urb_dequeue, 74 .endpoint_disable = ehci_endpoint_disable, 75 76 /* 77 * scheduling support 78 */ 79 .get_frame_number = ehci_get_frame, 80 81 /* 82 * root hub support 83 */ 84 .hub_status_data = ehci_hub_status_data, 85 .hub_control = ehci_hub_control, 86 87 #ifdef CONFIG_PM 88 .bus_suspend = ehci_bus_suspend, 89 .bus_resume = ehci_bus_resume, 90 #endif 91 92 .relinquish_port = ehci_relinquish_port, 93 .port_handed_over = ehci_port_handed_over, 94 }; 95 96 static int ehci_hcd_sh_probe(struct platform_device *pdev) 97 { 98 const struct hc_driver *driver = &ehci_sh_hc_driver; 99 struct resource *res; 100 struct ehci_sh_priv *priv; 101 struct usb_hcd *hcd; 102 int irq, ret; 103 104 if (usb_disabled()) 105 return -ENODEV; 106 107 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 108 if (!res) { 109 dev_err(&pdev->dev, 110 "Found HC with no register addr. Check %s setup!\n", 111 dev_name(&pdev->dev)); 112 ret = -ENODEV; 113 goto fail_create_hcd; 114 } 115 116 irq = platform_get_irq(pdev, 0); 117 if (irq <= 0) { 118 dev_err(&pdev->dev, 119 "Found HC with no IRQ. Check %s setup!\n", 120 dev_name(&pdev->dev)); 121 ret = -ENODEV; 122 goto fail_create_hcd; 123 } 124 125 /* initialize hcd */ 126 hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev, 127 dev_name(&pdev->dev)); 128 if (!hcd) { 129 ret = -ENOMEM; 130 goto fail_create_hcd; 131 } 132 133 hcd->rsrc_start = res->start; 134 hcd->rsrc_len = resource_size(res); 135 136 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, 137 driver->description)) { 138 dev_dbg(&pdev->dev, "controller already in use\n"); 139 ret = -EBUSY; 140 goto fail_request_resource; 141 } 142 143 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len); 144 if (hcd->regs == NULL) { 145 dev_dbg(&pdev->dev, "error mapping memory\n"); 146 ret = -ENXIO; 147 goto fail_ioremap; 148 } 149 150 priv = kmalloc(sizeof(struct ehci_sh_priv), GFP_KERNEL); 151 if (!priv) { 152 dev_dbg(&pdev->dev, "error allocating priv data\n"); 153 ret = -ENOMEM; 154 goto fail_alloc; 155 } 156 157 /* These are optional, we don't care if they fail */ 158 priv->fclk = clk_get(&pdev->dev, "usb_fck"); 159 if (IS_ERR(priv->fclk)) 160 priv->fclk = NULL; 161 162 priv->iclk = clk_get(&pdev->dev, "usb_ick"); 163 if (IS_ERR(priv->iclk)) 164 priv->iclk = NULL; 165 166 clk_enable(priv->fclk); 167 clk_enable(priv->iclk); 168 169 ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED); 170 if (ret != 0) { 171 dev_err(&pdev->dev, "Failed to add hcd"); 172 goto fail_add_hcd; 173 } 174 175 priv->hcd = hcd; 176 platform_set_drvdata(pdev, priv); 177 178 return ret; 179 180 fail_add_hcd: 181 clk_disable(priv->iclk); 182 clk_disable(priv->fclk); 183 184 clk_put(priv->iclk); 185 clk_put(priv->fclk); 186 187 kfree(priv); 188 fail_alloc: 189 iounmap(hcd->regs); 190 fail_ioremap: 191 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 192 fail_request_resource: 193 usb_put_hcd(hcd); 194 fail_create_hcd: 195 dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret); 196 197 return ret; 198 } 199 200 static int __exit ehci_hcd_sh_remove(struct platform_device *pdev) 201 { 202 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 203 struct usb_hcd *hcd = priv->hcd; 204 205 usb_remove_hcd(hcd); 206 iounmap(hcd->regs); 207 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 208 usb_put_hcd(hcd); 209 platform_set_drvdata(pdev, NULL); 210 211 clk_disable(priv->fclk); 212 clk_disable(priv->iclk); 213 214 clk_put(priv->fclk); 215 clk_put(priv->iclk); 216 217 kfree(priv); 218 219 return 0; 220 } 221 222 static void ehci_hcd_sh_shutdown(struct platform_device *pdev) 223 { 224 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 225 struct usb_hcd *hcd = priv->hcd; 226 227 if (hcd->driver->shutdown) 228 hcd->driver->shutdown(hcd); 229 } 230 231 static struct platform_driver ehci_hcd_sh_driver = { 232 .probe = ehci_hcd_sh_probe, 233 .remove = __exit_p(ehci_hcd_sh_remove), 234 .shutdown = ehci_hcd_sh_shutdown, 235 .driver = { 236 .name = "sh_ehci", 237 .owner = THIS_MODULE, 238 }, 239 }; 240 241 MODULE_ALIAS("platform:sh_ehci"); 242