usb: add support for generic EHCI devices

This driver is meant to be used with any EHCI-compatible host
controller in case if there's no need for platform-specific
glue such as setup of controller or PHY's power mode via
GPIOs etc.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Stephen Warren <swarren@nvidia.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Marek Vasut <marex@denx.de>

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 2a2bffe06fe0ec8c311b4b2e7b8f2a2687691581..0096a2fdd9da5cc304446c37d80a2f3131c1bf5f 100644 (file)
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -73,4 +73,12 @@ config USB_EHCI_UNIPHIER
        ---help---
          Enables support for the on-chip EHCI controller on UniPhier SoCs.
 
+config USB_EHCI_GENERIC
+       bool "Support for generic EHCI USB controller"
+       depends on OF_CONTROL
+       depends on DM_USB
+       default n
+       ---help---
+         Enables support for generic EHCI controller.
+
 endif

diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 645b990c76b8e3e43af096d3cc194a91dad40f30..0b4b458ccacb1d9f1a9a28f742f381426b73e059 100644 (file)
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -32,6 +32,7 @@ else
 obj-$(CONFIG_USB_EHCI_FSL) += ehci-fsl.o
 endif
 obj-$(CONFIG_USB_EHCI_FARADAY) += ehci-faraday.o
+obj-$(CONFIG_USB_EHCI_GENERIC) += ehci-generic.o
 obj-$(CONFIG_USB_EHCI_EXYNOS) += ehci-exynos.o
 obj-$(CONFIG_USB_EHCI_MXC) += ehci-mxc.o
 obj-$(CONFIG_USB_EHCI_MXS) += ehci-mxs.o

diff --git a/drivers/usb/host/ehci-generic.c b/drivers/usb/host/ehci-generic.c
new file mode 100644 (file)
index 0000000..1292caa
--- /dev/null
+++ b/drivers/usb/host/ehci-generic.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2015 Alexey Brodkin <abrodkin@synopsys.com>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include "ehci.h"
+
+/*
+ * Even though here we don't explicitly use "struct ehci_ctrl"
+ * ehci_register() expects it to be the first thing that resides in
+ * device's private data.
+ */
+struct generic_ehci {
+       struct ehci_ctrl ctrl;
+};
+
+static int ehci_usb_probe(struct udevice *dev)
+{
+       struct ehci_hccr *hccr = (struct ehci_hccr *)dev_get_addr(dev);
+       struct ehci_hcor *hcor;
+
+       hcor = (struct ehci_hcor *)((uintptr_t)hccr +
+                                   HC_LENGTH(ehci_readl(&hccr->cr_capbase)));
+
+       return ehci_register(dev, hccr, hcor, NULL, 0, USB_INIT_HOST);
+}
+
+static int ehci_usb_remove(struct udevice *dev)
+{
+       return ehci_deregister(dev);
+}
+
+static const struct udevice_id ehci_usb_ids[] = {
+       { .compatible = "generic-ehci" },
+       { }
+};
+
+U_BOOT_DRIVER(ehci_generic) = {
+       .name   = "ehci_generic",
+       .id     = UCLASS_USB,
+       .of_match = ehci_usb_ids,
+       .probe = ehci_usb_probe,
+       .remove = ehci_usb_remove,
+       .ops    = &ehci_usb_ops,
+       .priv_auto_alloc_size = sizeof(struct generic_ehci),
+       .flags  = DM_FLAG_ALLOC_PRIV_DMA,
+};