1 /* 2 * Driver for EHCI HCD on SPEAR SOC 3 * 4 * Copyright (C) 2010 ST Micro Electronics, 5 * Deepak Sikri <deepak.sikri@st.com> 6 * 7 * Based on various ehci-*.c drivers 8 * 9 * This file is subject to the terms and conditions of the GNU General Public 10 * License. See the file COPYING in the main directory of this archive for 11 * more details. 12 */ 13 14 #include <linux/platform_device.h> 15 #include <linux/clk.h> 16 17 struct spear_ehci { 18 struct ehci_hcd ehci; 19 struct clk *clk; 20 }; 21 22 #define to_spear_ehci(hcd) (struct spear_ehci *)hcd_to_ehci(hcd) 23 24 static void spear_start_ehci(struct spear_ehci *ehci) 25 { 26 clk_enable(ehci->clk); 27 } 28 29 static void spear_stop_ehci(struct spear_ehci *ehci) 30 { 31 clk_disable(ehci->clk); 32 } 33 34 static int ehci_spear_setup(struct usb_hcd *hcd) 35 { 36 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 37 int retval = 0; 38 39 /* registers start at offset 0x0 */ 40 ehci->caps = hcd->regs; 41 ehci->regs = hcd->regs + HC_LENGTH(ehci, ehci_readl(ehci, 42 &ehci->caps->hc_capbase)); 43 /* cache this readonly data; minimize chip reads */ 44 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); 45 retval = ehci_halt(ehci); 46 if (retval) 47 return retval; 48 49 retval = ehci_init(hcd); 50 if (retval) 51 return retval; 52 53 ehci_reset(ehci); 54 ehci_port_power(ehci, 0); 55 56 return retval; 57 } 58 59 static const struct hc_driver ehci_spear_hc_driver = { 60 .description = hcd_name, 61 .product_desc = "SPEAr EHCI", 62 .hcd_priv_size = sizeof(struct spear_ehci), 63 64 /* generic hardware linkage */ 65 .irq = ehci_irq, 66 .flags = HCD_MEMORY | HCD_USB2, 67 68 /* basic lifecycle operations */ 69 .reset = ehci_spear_setup, 70 .start = ehci_run, 71 .stop = ehci_stop, 72 .shutdown = ehci_shutdown, 73 74 /* managing i/o requests and associated device resources */ 75 .urb_enqueue = ehci_urb_enqueue, 76 .urb_dequeue = ehci_urb_dequeue, 77 .endpoint_disable = ehci_endpoint_disable, 78 .endpoint_reset = ehci_endpoint_reset, 79 80 /* scheduling support */ 81 .get_frame_number = ehci_get_frame, 82 83 /* root hub support */ 84 .hub_status_data = ehci_hub_status_data, 85 .hub_control = ehci_hub_control, 86 .bus_suspend = ehci_bus_suspend, 87 .bus_resume = ehci_bus_resume, 88 .relinquish_port = ehci_relinquish_port, 89 .port_handed_over = ehci_port_handed_over, 90 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 91 }; 92 93 static int spear_ehci_hcd_drv_probe(struct platform_device *pdev) 94 { 95 struct usb_hcd *hcd ; 96 struct spear_ehci *ehci; 97 struct resource *res; 98 struct clk *usbh_clk; 99 const struct hc_driver *driver = &ehci_spear_hc_driver; 100 int *pdata = pdev->dev.platform_data; 101 int irq, retval; 102 char clk_name[20] = "usbh_clk"; 103 104 if (pdata == NULL) 105 return -EFAULT; 106 107 if (usb_disabled()) 108 return -ENODEV; 109 110 irq = platform_get_irq(pdev, 0); 111 if (irq < 0) { 112 retval = irq; 113 goto fail_irq_get; 114 } 115 116 if (*pdata >= 0) 117 sprintf(clk_name, "usbh.%01d_clk", *pdata); 118 119 usbh_clk = clk_get(NULL, clk_name); 120 if (IS_ERR(usbh_clk)) { 121 dev_err(&pdev->dev, "Error getting interface clock\n"); 122 retval = PTR_ERR(usbh_clk); 123 goto fail_get_usbh_clk; 124 } 125 126 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); 127 if (!hcd) { 128 retval = -ENOMEM; 129 goto fail_create_hcd; 130 } 131 132 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 133 if (!res) { 134 retval = -ENODEV; 135 goto fail_request_resource; 136 } 137 138 hcd->rsrc_start = res->start; 139 hcd->rsrc_len = resource_size(res); 140 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, 141 driver->description)) { 142 retval = -EBUSY; 143 goto fail_request_resource; 144 } 145 146 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 147 if (hcd->regs == NULL) { 148 dev_dbg(&pdev->dev, "error mapping memory\n"); 149 retval = -ENOMEM; 150 goto fail_ioremap; 151 } 152 153 ehci = (struct spear_ehci *)hcd_to_ehci(hcd); 154 ehci->clk = usbh_clk; 155 156 spear_start_ehci(ehci); 157 retval = usb_add_hcd(hcd, irq, IRQF_SHARED); 158 if (retval) 159 goto fail_add_hcd; 160 161 return retval; 162 163 fail_add_hcd: 164 spear_stop_ehci(ehci); 165 iounmap(hcd->regs); 166 fail_ioremap: 167 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 168 fail_request_resource: 169 usb_put_hcd(hcd); 170 fail_create_hcd: 171 clk_put(usbh_clk); 172 fail_get_usbh_clk: 173 fail_irq_get: 174 dev_err(&pdev->dev, "init fail, %d\n", retval); 175 176 return retval ; 177 } 178 179 static int spear_ehci_hcd_drv_remove(struct platform_device *pdev) 180 { 181 struct usb_hcd *hcd = platform_get_drvdata(pdev); 182 struct spear_ehci *ehci_p = to_spear_ehci(hcd); 183 184 if (!hcd) 185 return 0; 186 if (in_interrupt()) 187 BUG(); 188 usb_remove_hcd(hcd); 189 190 if (ehci_p->clk) 191 spear_stop_ehci(ehci_p); 192 iounmap(hcd->regs); 193 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 194 usb_put_hcd(hcd); 195 196 if (ehci_p->clk) 197 clk_put(ehci_p->clk); 198 199 return 0; 200 } 201 202 static struct platform_driver spear_ehci_hcd_driver = { 203 .probe = spear_ehci_hcd_drv_probe, 204 .remove = spear_ehci_hcd_drv_remove, 205 .shutdown = usb_hcd_platform_shutdown, 206 .driver = { 207 .name = "spear-ehci", 208 .bus = &platform_bus_type 209 } 210 }; 211 212 MODULE_ALIAS("platform:spear-ehci"); 213