drivers/usb/host/ehci-atmel.c

   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 #include <linux/of.h>
  17 #include <linux/of_platform.h>
  18
  19 /* interface and function clocks */
  20 static struct clk *iclk, *fclk;
  21 static int clocked;
  22
  23 /*-------------------------------------------------------------------------*/
  24
  25 static void atmel_start_clock(void)
  26 {
  27         clk_enable(iclk);
  28         clk_enable(fclk);
  29         clocked = 1;
  30 }
  31
  32 static void atmel_stop_clock(void)
  33 {
  34         clk_disable(fclk);
  35         clk_disable(iclk);
  36         clocked = 0;
  37 }
  38
  39 static void atmel_start_ehci(struct platform_device *pdev)
  40 {
  41         dev_dbg(&pdev->dev, "start\n");
  42         atmel_start_clock();
  43 }
  44
  45 static void atmel_stop_ehci(struct platform_device *pdev)
  46 {
  47         dev_dbg(&pdev->dev, "stop\n");
  48         atmel_stop_clock();
  49 }
  50
  51 /*-------------------------------------------------------------------------*/
  52
  53 static int ehci_atmel_setup(struct usb_hcd *hcd)
  54 {
  55         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  56         int retval;
  57
  58         /* registers start at offset 0x0 */
  59         ehci->caps = hcd->regs;
  60
  61         retval = ehci_setup(hcd);
  62         if (retval)
  63                 return retval;
  64
  65         ehci_port_power(ehci, 0);
  66
  67         return retval;
  68 }
  69
  70 static const struct hc_driver ehci_atmel_hc_driver = {
  71         .description            = hcd_name,
  72         .product_desc           = "Atmel EHCI UHP HS",
  73         .hcd_priv_size          = sizeof(struct ehci_hcd),
  74
  75         /* generic hardware linkage */
  76         .irq                    = ehci_irq,
  77         .flags                  = HCD_MEMORY | HCD_USB2,
  78
  79         /* basic lifecycle operations */
  80         .reset                  = ehci_atmel_setup,
  81         .start                  = ehci_run,
  82         .stop                   = ehci_stop,
  83         .shutdown               = ehci_shutdown,
  84
  85         /* managing i/o requests and associated device resources */
  86         .urb_enqueue            = ehci_urb_enqueue,
  87         .urb_dequeue            = ehci_urb_dequeue,
  88         .endpoint_disable       = ehci_endpoint_disable,
  89         .endpoint_reset         = ehci_endpoint_reset,
  90
  91         /* scheduling support */
  92         .get_frame_number       = ehci_get_frame,
  93
  94         /* root hub support */
  95         .hub_status_data        = ehci_hub_status_data,
  96         .hub_control            = ehci_hub_control,
  97         .bus_suspend            = ehci_bus_suspend,
  98         .bus_resume             = ehci_bus_resume,
  99         .relinquish_port        = ehci_relinquish_port,
 100         .port_handed_over       = ehci_port_handed_over,
 101
 102         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
 103 };
 104
 105 static u64 at91_ehci_dma_mask = DMA_BIT_MASK(32);
 106
 107 static int __devinit ehci_atmel_drv_probe(struct platform_device *pdev)
 108 {
 109         struct usb_hcd *hcd;
 110         const struct hc_driver *driver = &ehci_atmel_hc_driver;
 111         struct resource *res;
 112         int irq;
 113         int retval;
 114
 115         if (usb_disabled())
 116                 return -ENODEV;
 117
 118         pr_debug("Initializing Atmel-SoC USB Host Controller\n");
 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                 retval = -ENODEV;
 126                 goto fail_create_hcd;
 127         }
 128
 129         /* Right now device-tree probed devices don't get dma_mask set.
 130          * Since shared usb code relies on it, set it here for now.
 131          * Once we have dma capability bindings this can go away.
 132          */
 133         if (!pdev->dev.dma_mask)
 134                 pdev->dev.dma_mask = &at91_ehci_dma_mask;
 135
 136         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 137         if (!hcd) {
 138                 retval = -ENOMEM;
 139                 goto fail_create_hcd;
 140         }
 141
 142         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 143         if (!res) {
 144                 dev_err(&pdev->dev,
 145                         "Found HC with no register addr. Check %s setup!\n",
 146                         dev_name(&pdev->dev));
 147                 retval = -ENODEV;
 148                 goto fail_request_resource;
 149         }
 150         hcd->rsrc_start = res->start;
 151         hcd->rsrc_len = resource_size(res);
 152
 153         hcd->regs = devm_request_and_ioremap(&pdev->dev, res);
 154         if (hcd->regs == NULL) {
 155                 dev_dbg(&pdev->dev, "error mapping memory\n");
 156                 retval = -EFAULT;
 157                 goto fail_request_resource;
 158         }
 159
 160         iclk = devm_clk_get(&pdev->dev, "ehci_clk");
 161         if (IS_ERR(iclk)) {
 162                 dev_err(&pdev->dev, "Error getting interface clock\n");
 163                 retval = -ENOENT;
 164                 goto fail_request_resource;
 165         }
 166         fclk = devm_clk_get(&pdev->dev, "uhpck");
 167         if (IS_ERR(fclk)) {
 168                 dev_err(&pdev->dev, "Error getting function clock\n");
 169                 retval = -ENOENT;
 170                 goto fail_request_resource;
 171         }
 172
 173         atmel_start_ehci(pdev);
 174
 175         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 176         if (retval)
 177                 goto fail_add_hcd;
 178
 179         return retval;
 180
 181 fail_add_hcd:
 182         atmel_stop_ehci(pdev);
 183 fail_request_resource:
 184         usb_put_hcd(hcd);
 185 fail_create_hcd:
 186         dev_err(&pdev->dev, "init %s fail, %d\n",
 187                 dev_name(&pdev->dev), retval);
 188
 189         return retval;
 190 }
 191
 192 static int __devexit ehci_atmel_drv_remove(struct platform_device *pdev)
 193 {
 194         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 195
 196         ehci_shutdown(hcd);
 197         usb_remove_hcd(hcd);
 198         usb_put_hcd(hcd);
 199
 200         atmel_stop_ehci(pdev);
 201         fclk = iclk = NULL;
 202
 203         return 0;
 204 }
 205
 206 #ifdef CONFIG_OF
 207 static const struct of_device_id atmel_ehci_dt_ids[] = {
 208         { .compatible = "atmel,at91sam9g45-ehci" },
 209         { /* sentinel */ }
 210 };
 211
 212 MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids);
 213 #endif
 214
 215 static struct platform_driver ehci_atmel_driver = {
 216         .probe          = ehci_atmel_drv_probe,
 217         .remove         = __devexit_p(ehci_atmel_drv_remove),
 218         .shutdown       = usb_hcd_platform_shutdown,
 219         .driver         = {
 220                 .name   = "atmel-ehci",
 221                 .of_match_table = of_match_ptr(atmel_ehci_dt_ids),
 222         },
 223 };