USB: Add platform device support for the ISP1760 USB chip

Currently, the driver only supports PCI and PPC_OF but there are
boards like ARM RealView where this is a platform device. The patch adds
the necessary functions and registration to the isp1760-if.c file and
modifies the corresponding Makefile and Kconfig to be able to use this
driver even if PCI and PPC_OF are not enabled.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 80 insertions, 17 deletions

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index c1cfed7eefb..845479f7c70 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -120,7 +120,7 @@ config USB_ISP116X_HCD
 
 config USB_ISP1760_HCD
         tristate "ISP 1760 HCD support"
-        depends on USB && EXPERIMENTAL && (PCI || PPC_OF)
+        depends on USB && EXPERIMENTAL
         ---help---
           The ISP1760 chip is a USB 2.0 host controller.
 
diff --git a/drivers/usb/host/isp1760-if.c b/drivers/usb/host/isp1760-if.c
index 4cf7ca428b3..3fa3a170279 100644
--- a/drivers/usb/host/isp1760-if.c
+++ b/drivers/usb/host/isp1760-if.c
@@ -10,6 +10,7 @@
 
 #include <linux/usb.h>
 #include <linux/io.h>
+#include <linux/platform_device.h>
 
 #include "../core/hcd.h"
 #include "isp1760-hcd.h"
@@ -300,39 +301,101 @@ static struct pci_driver isp1761_pci_driver = {
 };
 #endif
 
+static int __devinit isp1760_plat_probe(struct platform_device *pdev)
+{
+        int ret = 0;
+        struct usb_hcd *hcd;
+        struct resource *mem_res;
+        struct resource *irq_res;
+        resource_size_t mem_size;
+        unsigned long irqflags = IRQF_SHARED | IRQF_DISABLED;
+
+        mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!mem_res) {
+                pr_warning("isp1760: Memory resource not available\n");
+                ret = -ENODEV;
+                goto out;
+        }
+        mem_size = resource_size(mem_res);
+        if (!request_mem_region(mem_res->start, mem_size, "isp1760")) {
+                pr_warning("isp1760: Cannot reserve the memory resource\n");
+                ret = -EBUSY;
+                goto out;
+        }
+
+        irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        if (!irq_res) {
+                pr_warning("isp1760: IRQ resource not available\n");
+                return -ENODEV;
+        }
+        irqflags |= irq_res->flags & IRQF_TRIGGER_MASK;
+
+        hcd = isp1760_register(mem_res->start, mem_size, irq_res->start,
+                               irqflags, &pdev->dev, dev_name(&pdev->dev), 0);
+        if (IS_ERR(hcd)) {
+                pr_warning("isp1760: Failed to register the HCD device\n");
+                ret = -ENODEV;
+                goto cleanup;
+        }
+
+        pr_info("ISP1760 USB device initialised\n");
+        return ret;
+
+cleanup:
+        release_mem_region(mem_res->start, mem_size);
+out:
+        return ret;
+}
+
+static int __devexit isp1760_plat_remove(struct platform_device *pdev)
+{
+        struct resource *mem_res;
+        resource_size_t mem_size;
+
+        mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        mem_size = resource_size(mem_res);
+        release_mem_region(mem_res->start, mem_size);
+
+        return 0;
+}
+
+static struct platform_driver isp1760_plat_driver = {
+        .probe  = isp1760_plat_probe,
+        .remove = isp1760_plat_remove,
+        .driver = {
+                .name   = "isp1760",
+        },
+};
+
 static int __init isp1760_init(void)
 {
-        int ret;
+        int ret, any_ret = -ENODEV;
 
         init_kmem_once();
 
+        ret = platform_driver_register(&isp1760_plat_driver);
+        if (!ret)
+                any_ret = 0;
 #ifdef CONFIG_PPC_OF
         ret = of_register_platform_driver(&isp1760_of_driver);
-        if (ret) {
-                deinit_kmem_cache();
-                return ret;
-        }
+        if (!ret)
+                any_ret = 0;
 #endif
 #ifdef CONFIG_PCI
         ret = pci_register_driver(&isp1761_pci_driver);
-        if (ret)
-                goto unreg_of;
+        if (!ret)
+                any_ret = 0;
 #endif
-        return ret;
 
-#ifdef CONFIG_PCI
-unreg_of:
-#endif
-#ifdef CONFIG_PPC_OF
-        of_unregister_platform_driver(&isp1760_of_driver);
-#endif
-        deinit_kmem_cache();
-        return ret;
+        if (any_ret)
+                deinit_kmem_cache();
+        return any_ret;
 }
 module_init(isp1760_init);
 
 static void __exit isp1760_exit(void)
 {
+        platform_driver_unregister(&isp1760_plat_driver);
 #ifdef CONFIG_PPC_OF
         of_unregister_platform_driver(&isp1760_of_driver);
 #endif