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/*
*
* Copyright 2011-2012 Freescale Semiconductor, Inc.
*
* TDM Loopback Test Module.
* This TDM test module is a small test module which registers with the
* TDM framework and transfer and receive data in loopback mode and also
* compares if the data sent is received correctly.
*
* Author: Sandeep Kumar Singh <sandeep@freescale.com>
*
* 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.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <linux/wait.h>
#include <linux/param.h>
#include <linux/tdm.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/tdm.h>
#define DRV_DESC "Test Module for Freescale Platforms with TDM support"
#define DRV_NAME "tdm_test"
#define POLL_COUNT 38
#define TDM_FRAME_LENGTH NUM_SAMPLES_PER_FRAME
#define TDM_E_OK 0
#define BUF_COUNT 7
#define DEBUG 0
int poll_count = POLL_COUNT;
module_param(poll_count, int, 0);
static struct task_struct *tdm_thread_task;
static struct tdm_driver test_tdmdev_driver;
struct tdm_port *tdmport;
int tdm_thread_state;
static int tdm_check_data(unsigned short *tx_data, unsigned short *rx_data)
{
int i, error = 0;
static int call_count;
for (i = 1; i < TDM_FRAME_LENGTH; i++) {
if (tx_data[i] != rx_data[i])
error++;
else
continue;
}
pr_info("Iteration: %d\n", ++call_count);
#if DEBUG
pr_info("TX DATA:\n");
for (i = 0; i < TDM_FRAME_LENGTH; i++) {
pr_info("%5x ", tx_data[i]);
if (i%20 == 19)
pr_info("\n");
}
pr_info("RX DATA:\n");
for (i = 0; i < TDM_FRAME_LENGTH; i++) {
pr_info("%5x ", rx_data[i]);
if (i%20 == 19)
pr_info("\n");
}
#endif
if (error)
pr_info("TX and RX buffer do NOT match. Err_count:"
"%d\n", error);
else
pr_info("TX and RX buffer MATCH\n");
return error;
}
static int tdm_thread(void *ptr)
{
void *h_port;
void *h_channel1;
int ret = TDM_E_OK;
int poll = 0;
int i = 0, j = 0;
int index = 0;
int error_count = 0;
int buffer_size;
uint16_t size = TDM_FRAME_LENGTH;
u16 ch1_id = 0;
unsigned short *tx_data[BUF_COUNT];
unsigned short *rx_data[BUF_COUNT];
tdm_thread_state = 1;
/* Open port */
ret = tdm_port_open(&test_tdmdev_driver, &h_port);
pr_debug("%s tdm_port_open ret = %d\n", __func__, ret);
if ((ret != TDM_E_OK) || (h_port == NULL)) {
pr_err("Error in tdm_port_open- ret %x\n", ret);
goto port1_failed;
}
/* Open Channel 1*/
ret = tdm_channel_open(ch1_id, 1, h_port, &h_channel1);
if ((ret != TDM_E_OK) || (h_channel1 == NULL)) {
pr_err("Error in tdm_channel_open(%d)- ret %x\n", ch1_id, ret);
goto ch1_failed;
}
buffer_size = sizeof(unsigned short)*BUF_COUNT*TDM_FRAME_LENGTH;
tx_data[0] = kmalloc(buffer_size, GFP_KERNEL);
rx_data[0] = kmalloc(buffer_size, GFP_KERNEL);
if ((tx_data[0] == NULL) || (rx_data[0] == NULL)) {
pr_err("Failed to get memory for buffer");
return 0;
}
for (i = 0; i < BUF_COUNT-1; i++) {
tx_data[i+1] = tx_data[i] + TDM_FRAME_LENGTH;
rx_data[i+1] = rx_data[i] + TDM_FRAME_LENGTH;
}
while ((poll < poll_count) && !kthread_should_stop()) {
poll++;
while (tdm_ch_poll(h_channel1, 10) != TDM_E_OK)
continue;
for (i = 0; i < TDM_FRAME_LENGTH; i++)
tx_data[index][i] = j*TDM_FRAME_LENGTH+i;
ret = tdm_channel_write(h_port, h_channel1, tx_data[index],
size);
if (ret != TDM_E_OK)
pr_info("Error in tdm_channel_write\n");
ret = tdm_channel_read(h_port, h_channel1, rx_data[index],
&size);
if (ret != TDM_E_OK)
pr_info("Error in tdm_channel_read\n");
/*
* There is a delay of 6 frame between transmitted data and
* received data. Hence we compare tx_data[0] with rx data[6]
* and so on
*/
if (j++ > BUF_COUNT)
error_count += tdm_check_data(tx_data[(index + 1)
%BUF_COUNT], rx_data[index]);
index++;
index = index%BUF_COUNT;
}
pr_info("\nTDM Loppback test completed.\n");
if (error_count == 0)
pr_info("TDM loopback test PASSED!\n");
else
pr_info("TDM loopback test FAILED!\n");
ret = tdm_channel_close(ch1_id, 1, h_port, h_channel1);
if (ret != TDM_E_OK) {
pr_err("Error in tdm_channel_close(%d)- ret %x\n", ch1_id, ret);
ret = -ENXIO;
}
ret = tdm_port_close(h_port);
pr_debug("%s tdm_port_close ret = %d\n", __func__, ret);
if (ret != TDM_E_OK) {
pr_err("Error in tdm_port_close- ret %x\n", ret);
ret = -ENXIO;
}
tdm_thread_state = 0;
return ret;
ch1_failed:
tdm_channel_close(ch1_id, 1, h_port, h_channel1);
port1_failed:
tdm_port_close(h_port);
return -ENXIO;
}
static int test_attach_adapter(struct tdm_adapter *adap)
{
tdm_thread_state = 0;
tdm_thread_task = kthread_run(tdm_thread, NULL, "tdm_thread");
return 0;
}
static int test_detach_adapter(struct tdm_adapter *adap)
{
if (tdm_thread_state)
kthread_stop(tdm_thread_task);
return 0;
}
static const struct tdm_device_id tdm_loopback_test_id[] = {
{ "fsl_tdm", 0 },
{ }
};
static struct tdm_driver test_tdmdev_driver = {
.attach_adapter = test_attach_adapter,
.detach_adapter = test_detach_adapter,
.id_table = tdm_loopback_test_id,
};
static int __init tdm_loopback_test_init(void)
{
int ret;
pr_info("TDM LOOPBACK TEST: \n");
test_tdmdev_driver.id = 1;
/* create a binding with TDM driver */
ret = tdm_add_driver(&test_tdmdev_driver);
if (ret == 0)
pr_info("TDM LOOPBACK TEST module installed\n");
else
pr_err("%s tdm_port_init failed\n", __func__);
return ret;
}
static void __exit tdm_loopback_test_exit(void)
{
tdm_unregister_driver(&test_tdmdev_driver);
pr_info("TDM LOOPBACK TEST module un-installed\n");
}
module_init(tdm_loopback_test_init);
module_exit(tdm_loopback_test_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sandeep Kumar Singh <sandeep@freescale.com>");
MODULE_DESCRIPTION("Test Loopback Test Module for Freescale Platforms"
" with TDM support");
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