1 /* 2 * Driver for EHCI UHP on Atmel chips 3 * 4 * Copyright (C) 2009 Atmel Corporation, 5 * Nicolas Ferre <nicolas.ferre@atmel.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/clk.h> 15 #include <linux/platform_device.h> 16 17 /* interface and function clocks */ 18 static struct clk *iclk, *fclk; 19 static int clocked; 20 21 /*-------------------------------------------------------------------------*/ 22 23 static void atmel_start_clock(void) 24 { 25 clk_enable(iclk); 26 clk_enable(fclk); 27 clocked = 1; 28 } 29 30 static void atmel_stop_clock(void) 31 { 32 clk_disable(fclk); 33 clk_disable(iclk); 34 clocked = 0; 35 } 36 37 static void atmel_start_ehci(struct platform_device *pdev) 38 { 39 dev_dbg(&pdev->dev, "start\n"); 40 atmel_start_clock(); 41 } 42 43 static void atmel_stop_ehci(struct platform_device *pdev) 44 { 45 dev_dbg(&pdev->dev, "stop\n"); 46 atmel_stop_clock(); 47 } 48 49 /*-------------------------------------------------------------------------*/ 50 51 static int ehci_atmel_setup(struct usb_hcd *hcd) 52 { 53 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 54 int retval = 0; 55 56 /* registers start at offset 0x0 */ 57 ehci->caps = hcd->regs; 58 ehci->regs = hcd->regs + 59 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase)); 60 dbg_hcs_params(ehci, "reset"); 61 dbg_hcc_params(ehci, "reset"); 62 63 /* cache this readonly data; minimize chip reads */ 64 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); 65 66 retval = ehci_halt(ehci); 67 if (retval) 68 return retval; 69 70 /* data structure init */ 71 retval = ehci_init(hcd); 72 if (retval) 73 return retval; 74 75 ehci->sbrn = 0x20; 76 77 ehci_reset(ehci); 78 ehci_port_power(ehci, 0); 79 80 return retval; 81 } 82 83 static const struct hc_driver ehci_atmel_hc_driver = { 84 .description = hcd_name, 85 .product_desc = "Atmel EHCI UHP HS", 86 .hcd_priv_size = sizeof(struct ehci_hcd), 87 88 /* generic hardware linkage */ 89 .irq = ehci_irq, 90 .flags = HCD_MEMORY | HCD_USB2, 91 92 /* basic lifecycle operations */ 93 .reset = ehci_atmel_setup, 94 .start = ehci_run, 95 .stop = ehci_stop, 96 .shutdown = ehci_shutdown, 97 98 /* managing i/o requests and associated device resources */ 99 .urb_enqueue = ehci_urb_enqueue, 100 .urb_dequeue = ehci_urb_dequeue, 101 .endpoint_disable = ehci_endpoint_disable, 102 .endpoint_reset = ehci_endpoint_reset, 103 104 /* scheduling support */ 105 .get_frame_number = ehci_get_frame, 106 107 /* root hub support */ 108 .hub_status_data = ehci_hub_status_data, 109 .hub_control = ehci_hub_control, 110 .bus_suspend = ehci_bus_suspend, 111 .bus_resume = ehci_bus_resume, 112 .relinquish_port = ehci_relinquish_port, 113 .port_handed_over = ehci_port_handed_over, 114 115 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 116 }; 117 118 static int __devinit ehci_atmel_drv_probe(struct platform_device *pdev) 119 { 120 struct usb_hcd *hcd; 121 const struct hc_driver *driver = &ehci_atmel_hc_driver; 122 struct resource *res; 123 int irq; 124 int retval; 125 126 if (usb_disabled()) 127 return -ENODEV; 128 129 pr_debug("Initializing Atmel-SoC USB Host Controller\n"); 130 131 irq = platform_get_irq(pdev, 0); 132 if (irq <= 0) { 133 dev_err(&pdev->dev, 134 "Found HC with no IRQ. Check %s setup!\n", 135 dev_name(&pdev->dev)); 136 retval = -ENODEV; 137 goto fail_create_hcd; 138 } 139 140 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); 141 if (!hcd) { 142 retval = -ENOMEM; 143 goto fail_create_hcd; 144 } 145 146 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 147 if (!res) { 148 dev_err(&pdev->dev, 149 "Found HC with no register addr. Check %s setup!\n", 150 dev_name(&pdev->dev)); 151 retval = -ENODEV; 152 goto fail_request_resource; 153 } 154 hcd->rsrc_start = res->start; 155 hcd->rsrc_len = resource_size(res); 156 157 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, 158 driver->description)) { 159 dev_dbg(&pdev->dev, "controller already in use\n"); 160 retval = -EBUSY; 161 goto fail_request_resource; 162 } 163 164 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len); 165 if (hcd->regs == NULL) { 166 dev_dbg(&pdev->dev, "error mapping memory\n"); 167 retval = -EFAULT; 168 goto fail_ioremap; 169 } 170 171 iclk = clk_get(&pdev->dev, "ehci_clk"); 172 if (IS_ERR(iclk)) { 173 dev_err(&pdev->dev, "Error getting interface clock\n"); 174 retval = -ENOENT; 175 goto fail_get_iclk; 176 } 177 fclk = clk_get(&pdev->dev, "uhpck"); 178 if (IS_ERR(fclk)) { 179 dev_err(&pdev->dev, "Error getting function clock\n"); 180 retval = -ENOENT; 181 goto fail_get_fclk; 182 } 183 184 atmel_start_ehci(pdev); 185 186 retval = usb_add_hcd(hcd, irq, IRQF_SHARED); 187 if (retval) 188 goto fail_add_hcd; 189 190 return retval; 191 192 fail_add_hcd: 193 atmel_stop_ehci(pdev); 194 clk_put(fclk); 195 fail_get_fclk: 196 clk_put(iclk); 197 fail_get_iclk: 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", 205 dev_name(&pdev->dev), retval); 206 207 return retval; 208 } 209 210 static int __devexit ehci_atmel_drv_remove(struct platform_device *pdev) 211 { 212 struct usb_hcd *hcd = platform_get_drvdata(pdev); 213 214 ehci_shutdown(hcd); 215 usb_remove_hcd(hcd); 216 iounmap(hcd->regs); 217 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 218 usb_put_hcd(hcd); 219 220 atmel_stop_ehci(pdev); 221 clk_put(fclk); 222 clk_put(iclk); 223 fclk = iclk = NULL; 224 225 return 0; 226 } 227 228 static struct platform_driver ehci_atmel_driver = { 229 .probe = ehci_atmel_drv_probe, 230 .remove = __devexit_p(ehci_atmel_drv_remove), 231 .shutdown = usb_hcd_platform_shutdown, 232 .driver.name = "atmel-ehci", 233 }; 234