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[PATCH 3/3] USB: ohci: add bus glue for the Atheros AR71XX/AR7240 SoCs

To: Ralf Baechle <ralf@linux-mips.org>
Subject: [PATCH 3/3] USB: ohci: add bus glue for the Atheros AR71XX/AR7240 SoCs
From: Gabor Juhos <juhosg@openwrt.org>
Date: Sun, 10 Apr 2011 22:05:00 +0200
Cc: linux-mips@linux-mips.org, Gabor Juhos <juhosg@openwrt.org>, Imre Kaloz <kaloz@openwrt.org>, Greg Kroah-Hartman <gregkh@suse.de>, Alan Stern <stern@rowland.harvard.edu>, linux-usb@vger.kernel.org
In-reply-to: <1302465900-16814-1-git-send-email-juhosg@openwrt.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <1302465900-16814-1-git-send-email-juhosg@openwrt.org>
Sender: linux-mips-bounce@linux-mips.org
The Atheros AR71XX/AR7240 SoCs have a built-in OHCI controller.
This patch adds the necessary glue code to make the generic OHCI
driver usable for them.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: linux-usb@vger.kernel.org
---
 arch/mips/ath79/Kconfig       |    2 +
 drivers/usb/host/Kconfig      |    8 ++
 drivers/usb/host/ohci-ath79.c |  151 +++++++++++++++++++++++++++++++++++++++++
 drivers/usb/host/ohci-hcd.c   |    5 ++
 4 files changed, 166 insertions(+), 0 deletions(-)
 create mode 100644 drivers/usb/host/ohci-ath79.c

diff --git a/arch/mips/ath79/Kconfig b/arch/mips/ath79/Kconfig
index 649a2a3..4770741 100644
--- a/arch/mips/ath79/Kconfig
+++ b/arch/mips/ath79/Kconfig
@@ -27,10 +27,12 @@ endmenu
 
 config SOC_AR71XX
        select USB_ARCH_HAS_EHCI
+       select USB_ARCH_HAS_OHCI
        def_bool n
 
 config SOC_AR724X
        select USB_ARCH_HAS_EHCI
+       select USB_ARCH_HAS_OHCI
        def_bool n
 
 config SOC_AR913X
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 9970c86..9a6751e 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -295,6 +295,14 @@ config USB_OHCI_HCD_OMAP3
          Enables support for the on-chip OHCI controller on
          OMAP3 and later chips.
 
+config USB_OHCI_ATH79
+       bool "USB OHCI support for the Atheros AR71XX/AR7240 SoCs"
+       depends on USB_OHCI_HCD && (SOC_AR71XX || SOC_AR724X)
+       default y
+       help
+         Enables support for the built-in OHCI controller present on the
+         Atheros AR71XX/AR7240 SoCs.
+
 config USB_OHCI_HCD_PPC_SOC
        bool "OHCI support for on-chip PPC USB controller"
        depends on USB_OHCI_HCD && (STB03xxx || PPC_MPC52xx)
diff --git a/drivers/usb/host/ohci-ath79.c b/drivers/usb/host/ohci-ath79.c
new file mode 100644
index 0000000..ffea3e7
--- /dev/null
+++ b/drivers/usb/host/ohci-ath79.c
@@ -0,0 +1,151 @@
+/*
+ *  OHCI HCD (Host Controller Driver) for USB.
+ *
+ *  Bus Glue for Atheros AR71XX/AR724X built-in OHCI controller.
+ *
+ *  Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
+ *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ *
+ *  Parts of this file are based on Atheros' 2.6.15 BSP
+ *     Copyright (C) 2007 Atheros Communications, Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#include <linux/platform_device.h>
+
+static int __devinit ohci_ath79_start(struct usb_hcd *hcd)
+{
+       struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+       int ret;
+
+       ret = ohci_init(ohci);
+       if (ret < 0)
+               return ret;
+
+       ret = ohci_run(ohci);
+       if (ret < 0)
+               goto err;
+
+       return 0;
+
+err:
+       ohci_stop(hcd);
+       return ret;
+}
+
+static const struct hc_driver ohci_ath79_hc_driver = {
+       .description            = hcd_name,
+       .product_desc           = "Atheros built-in OHCI controller",
+       .hcd_priv_size          = sizeof(struct ohci_hcd),
+
+       .irq                    = ohci_irq,
+       .flags                  = HCD_USB11 | HCD_MEMORY,
+
+       .start                  = ohci_ath79_start,
+       .stop                   = ohci_stop,
+       .shutdown               = ohci_shutdown,
+
+       .urb_enqueue            = ohci_urb_enqueue,
+       .urb_dequeue            = ohci_urb_dequeue,
+       .endpoint_disable       = ohci_endpoint_disable,
+
+       /*
+        * scheduling support
+        */
+       .get_frame_number       = ohci_get_frame,
+
+       /*
+        * root hub support
+        */
+       .hub_status_data        = ohci_hub_status_data,
+       .hub_control            = ohci_hub_control,
+       .start_port_reset       = ohci_start_port_reset,
+};
+
+static int ohci_ath79_probe(struct platform_device *pdev)
+{
+       struct usb_hcd *hcd;
+       struct resource *res;
+       int irq;
+       int ret;
+
+       if (usb_disabled())
+               return -ENODEV;
+
+       res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+       if (!res) {
+               dev_dbg(&pdev->dev, "no IRQ specified\n");
+               return -ENODEV;
+       }
+       irq = res->start;
+
+       hcd = usb_create_hcd(&ohci_ath79_hc_driver, &pdev->dev,
+                            dev_name(&pdev->dev));
+       if (!hcd)
+               return -ENOMEM;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!res) {
+               dev_dbg(&pdev->dev, "no base address specified\n");
+               ret = -ENODEV;
+               goto err_put_hcd;
+       }
+       hcd->rsrc_start = res->start;
+       hcd->rsrc_len   = res->end - res->start + 1;
+
+       if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+               dev_dbg(&pdev->dev, "controller already in use\n");
+               ret = -EBUSY;
+               goto err_put_hcd;
+       }
+
+       hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+       if (!hcd->regs) {
+               dev_dbg(&pdev->dev, "error mapping memory\n");
+               ret = -EFAULT;
+               goto err_release_region;
+       }
+
+       ohci_hcd_init(hcd_to_ohci(hcd));
+
+       ret = usb_add_hcd(hcd, irq, IRQF_DISABLED);
+       if (ret)
+               goto err_stop_hcd;
+
+       return 0;
+
+err_stop_hcd:
+       iounmap(hcd->regs);
+err_release_region:
+       release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err_put_hcd:
+       usb_put_hcd(hcd);
+       return ret;
+}
+
+static int ohci_ath79_remove(struct platform_device *pdev)
+{
+       struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+       usb_remove_hcd(hcd);
+       iounmap(hcd->regs);
+       release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+       usb_put_hcd(hcd);
+
+       return 0;
+}
+
+static struct platform_driver ohci_hcd_ath79_driver = {
+       .probe          = ohci_ath79_probe,
+       .remove         = ohci_ath79_remove,
+       .shutdown       = usb_hcd_platform_shutdown,
+       .driver         = {
+               .name   = "ath79-ohci",
+               .owner  = THIS_MODULE,
+       },
+};
+
+MODULE_ALIAS(PLATFORM_MODULE_PREFIX "ath79-ohci");
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index e728863..8aec65f 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -1105,6 +1105,11 @@ MODULE_LICENSE ("GPL");
 #define PLATFORM_DRIVER                ohci_hcd_cns3xxx_driver
 #endif
 
+#ifdef CONFIG_USB_OHCI_ATH79
+#include "ohci-ath79.c"
+#define PLATFORM_DRIVER                ohci_hcd_ath79_driver
+#endif
+
 #if    !defined(PCI_DRIVER) &&         \
        !defined(PLATFORM_DRIVER) &&    \
        !defined(OMAP1_PLATFORM_DRIVER) &&      \
-- 
1.7.2.1


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