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- /*
- * Copyright 2012 Tilera Corporation. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for
- * more details.
- *
- * TILE-Gx IORPC support for kernel I/O drivers.
- */
- #include <linux/mmzone.h>
- #include <linux/module.h>
- #include <linux/io.h>
- #include <gxio/iorpc_globals.h>
- #include <gxio/kiorpc.h>
- #ifdef DEBUG_IORPC
- #define TRACE(FMT, ...) pr_info(SIMPLE_MSG_LINE FMT, ## __VA_ARGS__)
- #else
- #define TRACE(...)
- #endif
- /* Create kernel-VA-space MMIO mapping for an on-chip IO device. */
- void __iomem *iorpc_ioremap(int hv_fd, resource_size_t offset,
- unsigned long size)
- {
- pgprot_t mmio_base, prot = { 0 };
- unsigned long pfn;
- int err;
- /* Look up the shim's lotar and base PA. */
- err = __iorpc_get_mmio_base(hv_fd, &mmio_base);
- if (err) {
- TRACE("get_mmio_base() failure: %d\n", err);
- return NULL;
- }
- /* Make sure the HV driver approves of our offset and size. */
- err = __iorpc_check_mmio_offset(hv_fd, offset, size);
- if (err) {
- TRACE("check_mmio_offset() failure: %d\n", err);
- return NULL;
- }
- /*
- * mmio_base contains a base pfn and homing coordinates. Turn
- * it into an MMIO pgprot and offset pfn.
- */
- prot = hv_pte_set_lotar(prot, hv_pte_get_lotar(mmio_base));
- pfn = pte_pfn(mmio_base) + PFN_DOWN(offset);
- return ioremap_prot(PFN_PHYS(pfn), size, prot);
- }
- EXPORT_SYMBOL(iorpc_ioremap);
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