mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-26 16:30:55 +07:00
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
|
/*
|
||
|
|
* 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);
|