bce5bbbb23
Provide kernel support for the tilegx "Transaction I/O" (TRIO) on-chip hardware. This hardware implements the PCIe interface for tilegx; the driver changes to use TRIO for PCIe are in a subsequent commit. The change is layered on top of the tilegx GXIO IORPC subsystem. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
49 lines
1.2 KiB
C
49 lines
1.2 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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* Implementation of trio gxio calls.
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*/
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <gxio/trio.h>
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#include <gxio/iorpc_globals.h>
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#include <gxio/iorpc_trio.h>
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#include <gxio/kiorpc.h>
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int gxio_trio_init(gxio_trio_context_t *context, unsigned int trio_index)
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{
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char file[32];
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int fd;
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snprintf(file, sizeof(file), "trio/%d/iorpc", trio_index);
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fd = hv_dev_open((HV_VirtAddr) file, 0);
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if (fd < 0) {
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context->fd = -1;
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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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return 0;
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}
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EXPORT_SYMBOL_GPL(gxio_trio_init);
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