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/*
* Copyright (c) 2013-2014 NVIDIA 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/list.h>
#include <linux/completion.h>
#include <linux/workqueue.h>
#include <linux/bitops.h>
#include <linux/uaccess.h>
#include <linux/dma-mapping.h>
#include "ote_protocol.h"
static DECLARE_COMPLETION(req_ready);
static DECLARE_COMPLETION(req_complete);
static struct te_ss_op *ss_op_shmem;
static uint32_t ss_op_size;
static void indicate_ss_op_complete(void)
{
tlk_generic_smc(TE_SMC_SS_REQ_COMPLETE, 0, 0);
}
int te_handle_ss_ioctl(struct file *file, unsigned int ioctl_num,
unsigned long ioctl_param)
{
switch (ioctl_num) {
case TE_IOCTL_SS_NEW_REQ:
/* wait for a new request */
if (wait_for_completion_interruptible(&req_ready))
return -ENODATA;
/* transfer pending request to daemon's buffer */
if (copy_to_user((void __user *)ioctl_param, ss_op_shmem,
ss_op_size)) {
pr_err("copy_to_user failed for new request\n");
return -EFAULT;
}
break;
case TE_IOCTL_SS_REQ_COMPLETE: /* request complete */
if (copy_from_user(ss_op_shmem, (void __user *)ioctl_param,
ss_op_size)) {
pr_err("copy_from_user failed for request\n");
return -EFAULT;
}
/* signal the producer */
complete(&req_complete);
break;
}
return 0;
}
void tlk_ss_op(uint32_t size)
{
/* store size of request */
ss_op_size = size;
/* signal consumer */
complete(&req_ready);
/* wait for the consumer's signal */
wait_for_completion(&req_complete);
/* signal completion to the secure world */
indicate_ss_op_complete();
}
static int __init tlk_ss_init(void)
{
dma_addr_t ss_op_shmem_dma;
/* allocate shared memory buffer */
ss_op_shmem = dma_alloc_coherent(NULL, sizeof(struct te_ss_op),
&ss_op_shmem_dma, GFP_KERNEL);
if (!ss_op_shmem) {
pr_err("%s: no memory available for fs operations\n", __func__);
return -ENOMEM;
}
tlk_generic_smc(TE_SMC_SS_REGISTER_HANDLER,
(uintptr_t)tlk_ss_op, (uintptr_t)ss_op_shmem);
return 0;
}
arch_initcall(tlk_ss_init);
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