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, 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 .endpoint_reset = ehci_endpoint_reset, 76 77 /* 78 * scheduling support 79 */ 80 .get_frame_number = ehci_get_frame, 81 82 /* 83 * root hub support 84 */ 85 .hub_status_data = ehci_hub_status_data, 86 .hub_control = ehci_hub_control, 87 88 #ifdef CONFIG_PM 89 .bus_suspend = ehci_bus_suspend, 90 .bus_resume = ehci_bus_resume, 91 #endif 92 93 .relinquish_port = ehci_relinquish_port, 94 .port_handed_over = ehci_port_handed_over, 95 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 96 }; 97 98 static int ehci_hcd_sh_probe(struct platform_device *pdev) 99 { 100 const struct hc_driver *driver = &ehci_sh_hc_driver; 101 struct resource *res; 102 struct ehci_sh_priv *priv; 103 struct usb_hcd *hcd; 104 int irq, ret; 105 106 if (usb_disabled()) 107 return -ENODEV; 108 109 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 110 if (!res) { 111 dev_err(&pdev->dev, 112 "Found HC with no register addr. Check %s setup!\n", 113 dev_name(&pdev->dev)); 114 ret = -ENODEV; 115 goto fail_create_hcd; 116 } 117 118 irq = platform_get_irq(pdev, 0); 119 if (irq <= 0) { 120 dev_err(&pdev->dev, 121 "Found HC with no IRQ. Check %s setup!\n", 122 dev_name(&pdev->dev)); 123 ret = -ENODEV; 124 goto fail_create_hcd; 125 } 126 127 /* initialize hcd */ 128 hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev, 129 dev_name(&pdev->dev)); 130 if (!hcd) { 131 ret = -ENOMEM; 132 goto fail_create_hcd; 133 } 134 135 hcd->rsrc_start = res->start; 136 hcd->rsrc_len = resource_size(res); 137 138 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, 139 driver->description)) { 140 dev_dbg(&pdev->dev, "controller already in use\n"); 141 ret = -EBUSY; 142 goto fail_request_resource; 143 } 144 145 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len); 146 if (hcd->regs == NULL) { 147 dev_dbg(&pdev->dev, "error mapping memory\n"); 148 ret = -ENXIO; 149 goto fail_ioremap; 150 } 151 152 priv = kmalloc(sizeof(struct ehci_sh_priv), GFP_KERNEL); 153 if (!priv) { 154 dev_dbg(&pdev->dev, "error allocating priv data\n"); 155 ret = -ENOMEM; 156 goto fail_alloc; 157 } 158 159 /* These are optional, we don't care if they fail */ 160 priv->fclk = clk_get(&pdev->dev, "usb_fck"); 161 if (IS_ERR(priv->fclk)) 162 priv->fclk = NULL; 163 164 priv->iclk = clk_get(&pdev->dev, "usb_ick"); 165 if (IS_ERR(priv->iclk)) 166 priv->iclk = NULL; 167 168 clk_enable(priv->fclk); 169 clk_enable(priv->iclk); 170 171 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 172 if (ret != 0) { 173 dev_err(&pdev->dev, "Failed to add hcd"); 174 goto fail_add_hcd; 175 } 176 177 priv->hcd = hcd; 178 platform_set_drvdata(pdev, priv); 179 180 return ret; 181 182 fail_add_hcd: 183 clk_disable(priv->iclk); 184 clk_disable(priv->fclk); 185 186 clk_put(priv->iclk); 187 clk_put(priv->fclk); 188 189 kfree(priv); 190 fail_alloc: 191 iounmap(hcd->regs); 192 fail_ioremap: 193 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 194 fail_request_resource: 195 usb_put_hcd(hcd); 196 fail_create_hcd: 197 dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret); 198 199 return ret; 200 } 201 202 static int __exit ehci_hcd_sh_remove(struct platform_device *pdev) 203 { 204 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 205 struct usb_hcd *hcd = priv->hcd; 206 207 usb_remove_hcd(hcd); 208 iounmap(hcd->regs); 209 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 210 usb_put_hcd(hcd); 211 platform_set_drvdata(pdev, NULL); 212 213 clk_disable(priv->fclk); 214 clk_disable(priv->iclk); 215 216 clk_put(priv->fclk); 217 clk_put(priv->iclk); 218 219 kfree(priv); 220 221 return 0; 222 } 223 224 static void ehci_hcd_sh_shutdown(struct platform_device *pdev) 225 { 226 struct ehci_sh_priv *priv = platform_get_drvdata(pdev); 227 struct usb_hcd *hcd = priv->hcd; 228 229 if (hcd->driver->shutdown) 230 hcd->driver->shutdown(hcd); 231 } 232 233 static struct platform_driver ehci_hcd_sh_driver = { 234 .probe = ehci_hcd_sh_probe, 235 .remove = __exit_p(ehci_hcd_sh_remove), 236 .shutdown = ehci_hcd_sh_shutdown, 237 .driver = { 238 .name = "sh_ehci", 239 .owner = THIS_MODULE, 240 }, 241 }; 242 243 MODULE_ALIAS("platform:sh_ehci"); 244