USB: at91: Add USB EHCI driver for at91sam9g45 series
authorNicolas Ferre <nicolas.ferre@atmel.com>
Mon, 27 Jul 2009 21:47:40 +0000 (14:47 -0700)
committerGreg Kroah-Hartman <gregkh@suse.de>
Wed, 23 Sep 2009 13:46:30 +0000 (06:46 -0700)
Add host USB High speed driver for at91sam9g45 series.
The host driver is an EHCI with its companion OHCI. EHCI is
handled by the new ehci-atmel.c whereas the OHCI is always
handled by ohci-at91.c.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
drivers/usb/Kconfig
drivers/usb/host/ehci-atmel.c [new file with mode: 0644]
drivers/usb/host/ehci-hcd.c

index 93cee3e5ca5852e9144e9316cedfc1fdaa4b804e..ebd7237230e34107398929f6b662a0a04f54fc40 100644 (file)
@@ -60,6 +60,7 @@ config USB_ARCH_HAS_EHCI
        default y if SOC_AU1200
        default y if ARCH_IXP4XX
        default y if ARCH_W90X900
+       default y if ARCH_AT91SAM9G45
        default PCI
 
 # ARM SA1111 chips have a non-PCI based "OHCI-compatible" USB host interface.
diff --git a/drivers/usb/host/ehci-atmel.c b/drivers/usb/host/ehci-atmel.c
new file mode 100644 (file)
index 0000000..87c1b7c
--- /dev/null
@@ -0,0 +1,230 @@
+/*
+ * Driver for EHCI UHP on Atmel chips
+ *
+ *  Copyright (C) 2009 Atmel Corporation,
+ *                     Nicolas Ferre <nicolas.ferre@atmel.com>
+ *
+ *  Based on various ehci-*.c drivers
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive for
+ * more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+
+/* interface and function clocks */
+static struct clk *iclk, *fclk;
+static int clocked;
+
+/*-------------------------------------------------------------------------*/
+
+static void atmel_start_clock(void)
+{
+       clk_enable(iclk);
+       clk_enable(fclk);
+       clocked = 1;
+}
+
+static void atmel_stop_clock(void)
+{
+       clk_disable(fclk);
+       clk_disable(iclk);
+       clocked = 0;
+}
+
+static void atmel_start_ehci(struct platform_device *pdev)
+{
+       dev_dbg(&pdev->dev, "start\n");
+       atmel_start_clock();
+}
+
+static void atmel_stop_ehci(struct platform_device *pdev)
+{
+       dev_dbg(&pdev->dev, "stop\n");
+       atmel_stop_clock();
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int ehci_atmel_setup(struct usb_hcd *hcd)
+{
+       struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+       int retval = 0;
+
+       /* registers start at offset 0x0 */
+       ehci->caps = hcd->regs;
+       ehci->regs = hcd->regs +
+               HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
+       dbg_hcs_params(ehci, "reset");
+       dbg_hcc_params(ehci, "reset");
+
+       /* cache this readonly data; minimize chip reads */
+       ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
+
+       retval = ehci_halt(ehci);
+       if (retval)
+               return retval;
+
+       /* data structure init */
+       retval = ehci_init(hcd);
+       if (retval)
+               return retval;
+
+       ehci->sbrn = 0x20;
+
+       ehci_reset(ehci);
+       ehci_port_power(ehci, 0);
+
+       return retval;
+}
+
+static const struct hc_driver ehci_atmel_hc_driver = {
+       .description            = hcd_name,
+       .product_desc           = "Atmel EHCI UHP HS",
+       .hcd_priv_size          = sizeof(struct ehci_hcd),
+
+       /* generic hardware linkage */
+       .irq                    = ehci_irq,
+       .flags                  = HCD_MEMORY | HCD_USB2,
+
+       /* basic lifecycle operations */
+       .reset                  = ehci_atmel_setup,
+       .start                  = ehci_run,
+       .stop                   = ehci_stop,
+       .shutdown               = ehci_shutdown,
+
+       /* managing i/o requests and associated device resources */
+       .urb_enqueue            = ehci_urb_enqueue,
+       .urb_dequeue            = ehci_urb_dequeue,
+       .endpoint_disable       = ehci_endpoint_disable,
+
+       /* scheduling support */
+       .get_frame_number       = ehci_get_frame,
+
+       /* root hub support */
+       .hub_status_data        = ehci_hub_status_data,
+       .hub_control            = ehci_hub_control,
+       .bus_suspend            = ehci_bus_suspend,
+       .bus_resume             = ehci_bus_resume,
+       .relinquish_port        = ehci_relinquish_port,
+       .port_handed_over       = ehci_port_handed_over,
+};
+
+static int __init ehci_atmel_drv_probe(struct platform_device *pdev)
+{
+       struct usb_hcd *hcd;
+       const struct hc_driver *driver = &ehci_atmel_hc_driver;
+       struct resource *res;
+       int irq;
+       int retval;
+
+       if (usb_disabled())
+               return -ENODEV;
+
+       pr_debug("Initializing Atmel-SoC USB Host Controller\n");
+
+       irq = platform_get_irq(pdev, 0);
+       if (irq <= 0) {
+               dev_err(&pdev->dev,
+                       "Found HC with no IRQ. Check %s setup!\n",
+                       dev_name(&pdev->dev));
+               retval = -ENODEV;
+               goto fail_create_hcd;
+       }
+
+       hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
+       if (!hcd) {
+               retval = -ENOMEM;
+               goto fail_create_hcd;
+       }
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!res) {
+               dev_err(&pdev->dev,
+                       "Found HC with no register addr. Check %s setup!\n",
+                       dev_name(&pdev->dev));
+               retval = -ENODEV;
+               goto fail_request_resource;
+       }
+       hcd->rsrc_start = res->start;
+       hcd->rsrc_len = res->end - res->start + 1;
+
+       if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
+                               driver->description)) {
+               dev_dbg(&pdev->dev, "controller already in use\n");
+               retval = -EBUSY;
+               goto fail_request_resource;
+       }
+
+       hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
+       if (hcd->regs == NULL) {
+               dev_dbg(&pdev->dev, "error mapping memory\n");
+               retval = -EFAULT;
+               goto fail_ioremap;
+       }
+
+       iclk = clk_get(&pdev->dev, "ehci_clk");
+       if (IS_ERR(iclk)) {
+               dev_err(&pdev->dev, "Error getting interface clock\n");
+               retval = -ENOENT;
+               goto fail_get_iclk;
+       }
+       fclk = clk_get(&pdev->dev, "uhpck");
+       if (IS_ERR(fclk)) {
+               dev_err(&pdev->dev, "Error getting function clock\n");
+               retval = -ENOENT;
+               goto fail_get_fclk;
+       }
+
+       atmel_start_ehci(pdev);
+
+       retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
+       if (retval)
+               goto fail_add_hcd;
+
+       return retval;
+
+fail_add_hcd:
+       atmel_stop_ehci(pdev);
+       clk_put(fclk);
+fail_get_fclk:
+       clk_put(iclk);
+fail_get_iclk:
+       iounmap(hcd->regs);
+fail_ioremap:
+       release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+fail_request_resource:
+       usb_put_hcd(hcd);
+fail_create_hcd:
+       dev_err(&pdev->dev, "init %s fail, %d\n",
+               dev_name(&pdev->dev), retval);
+
+       return retval;
+}
+
+static int __exit ehci_atmel_drv_remove(struct platform_device *pdev)
+{
+       struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+       ehci_shutdown(hcd);
+       usb_remove_hcd(hcd);
+       iounmap(hcd->regs);
+       release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+       usb_put_hcd(hcd);
+
+       atmel_stop_ehci(pdev);
+       clk_put(fclk);
+       clk_put(iclk);
+       fclk = iclk = NULL;
+
+       return 0;
+}
+
+static struct platform_driver ehci_atmel_driver = {
+       .probe          = ehci_atmel_drv_probe,
+       .remove         = __exit_p(ehci_atmel_drv_remove),
+       .shutdown       = usb_hcd_platform_shutdown,
+       .driver.name    = "atmel-ehci",
+};
index 5fbc67c5a9136986930101eb2add9e225bc1394f..c227ba46d6f38608dc107f650a825437fef824ea 100644 (file)
@@ -1136,6 +1136,11 @@ MODULE_LICENSE ("GPL");
 #define        PLATFORM_DRIVER         ehci_hcd_w90x900_driver
 #endif
 
+#ifdef CONFIG_ARCH_AT91
+#include "ehci-atmel.c"
+#define        PLATFORM_DRIVER         ehci_atmel_driver
+#endif
+
 #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
     !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER)
 #error "missing bus glue for ehci-hcd"