d1cc1732cc
This change adds support for accessing the USB shim from within the kernel. Note that this change by itself does not allow the kernel to act as a host or as a device; it merely exposes the built-in on-chip hardware to the kernel. The <arch/usb_host.h> and <arch/usb_host_def.h> headers are empty at the moment because the kernel does not require any types or definitions specific to the tilegx USB shim; the generic USB core code is all we need. The headers are left in as stubs so that we don't need to modify the hypervisor header (drv_usb_host_intf.h) from upstream. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
91 lines
2 KiB
C
91 lines
2 KiB
C
/*
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* Copyright 2012 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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/*
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*
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* Implementation of USB gxio calls.
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*/
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#include <linux/io.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <gxio/iorpc_globals.h>
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#include <gxio/iorpc_usb_host.h>
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#include <gxio/kiorpc.h>
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#include <gxio/usb_host.h>
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int gxio_usb_host_init(gxio_usb_host_context_t * context, int usb_index,
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int is_ehci)
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{
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char file[32];
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int fd;
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if (is_ehci)
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snprintf(file, sizeof(file), "usb_host/%d/iorpc/ehci",
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usb_index);
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else
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snprintf(file, sizeof(file), "usb_host/%d/iorpc/ohci",
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usb_index);
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fd = hv_dev_open((HV_VirtAddr) file, 0);
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if (fd < 0) {
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if (fd >= GXIO_ERR_MIN && fd <= GXIO_ERR_MAX)
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return fd;
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else
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return -ENODEV;
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}
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context->fd = fd;
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// Map in the MMIO space.
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context->mmio_base =
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(void __force *)iorpc_ioremap(fd, 0, HV_USB_HOST_MMIO_SIZE);
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if (context->mmio_base == NULL) {
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hv_dev_close(context->fd);
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return -ENODEV;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(gxio_usb_host_init);
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int gxio_usb_host_destroy(gxio_usb_host_context_t * context)
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{
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iounmap((void __force __iomem *)(context->mmio_base));
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hv_dev_close(context->fd);
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context->mmio_base = NULL;
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context->fd = -1;
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return 0;
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}
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EXPORT_SYMBOL_GPL(gxio_usb_host_destroy);
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void *gxio_usb_host_get_reg_start(gxio_usb_host_context_t * context)
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{
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return context->mmio_base;
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}
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EXPORT_SYMBOL_GPL(gxio_usb_host_get_reg_start);
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size_t gxio_usb_host_get_reg_len(gxio_usb_host_context_t * context)
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{
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return HV_USB_HOST_MMIO_SIZE;
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}
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EXPORT_SYMBOL_GPL(gxio_usb_host_get_reg_len);
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