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62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
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/*
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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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* TILE-Gx IORPC support for kernel I/O drivers.
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*/
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#include <linux/mmzone.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <gxio/iorpc_globals.h>
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#include <gxio/kiorpc.h>
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#ifdef DEBUG_IORPC
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#define TRACE(FMT, ...) pr_info(SIMPLE_MSG_LINE FMT, ## __VA_ARGS__)
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#else
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#define TRACE(...)
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#endif
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/* Create kernel-VA-space MMIO mapping for an on-chip IO device. */
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void __iomem *iorpc_ioremap(int hv_fd, resource_size_t offset,
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unsigned long size)
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{
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pgprot_t mmio_base, prot = { 0 };
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unsigned long pfn;
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int err;
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/* Look up the shim's lotar and base PA. */
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err = __iorpc_get_mmio_base(hv_fd, &mmio_base);
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if (err) {
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TRACE("get_mmio_base() failure: %d\n", err);
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return NULL;
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}
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/* Make sure the HV driver approves of our offset and size. */
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err = __iorpc_check_mmio_offset(hv_fd, offset, size);
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if (err) {
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TRACE("check_mmio_offset() failure: %d\n", err);
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return NULL;
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}
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/*
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* mmio_base contains a base pfn and homing coordinates. Turn
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* it into an MMIO pgprot and offset pfn.
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*/
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prot = hv_pte_set_lotar(prot, hv_pte_get_lotar(mmio_base));
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pfn = pte_pfn(mmio_base) + PFN_DOWN(offset);
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return ioremap_prot(PFN_PHYS(pfn), size, prot);
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}
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EXPORT_SYMBOL(iorpc_ioremap);
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