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/*
* Copyright 2012 Freescale Semiconductor, Inc.
*
* Author: Andrey Butok
*
* Simple test/example module for Coldfire eDMA.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
***************************************************************************
* Changes:
* v0.001 29 February 2008 Andrey Butok
* Initial Release
*
* NOTE: This module tests eDMA driver performing
* a simple memory to memory transfer with a 32 bit
* source and destination transfer size that generates
* an interrupt when the transfer is complete.
*/
#include <linux/device.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <asm/cacheflush.h>
#include <mach/mcf_edma.h>
#include <linux/slab.h>
#define MCF_EDMA_TEST_DRIVER_VERSION "Revision: 0.001"
#define MCF_EDMA_TEST_DRIVER_AUTHOR \
"Freescale Semiconductor Inc, Andrey Butok"
#define MCF_EDMA_TEST_DRIVER_DESC \
"Simple testing module for Coldfire eDMA "
#define MCF_EDMA_TEST_DRIVER_INFO \
MCF_EDMA_TEST_DRIVER_VERSION " " MCF_EDMA_TEST_DRIVER_DESC
#define MCF_EDMA_TEST_DRIVER_LICENSE "GPL"
#define MCF_EDMA_TEST_DRIVER_NAME "mcf_edma_test"
#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif
/* Global variable used to signal main process when interrupt is recognized */
static int mcf_edma_test_interrupt;
int *mcf_edma_test_interrupt_p = &mcf_edma_test_interrupt;
/********************************************************************/
static int
mcf_edma_test_handler(int channel, void *dev_id)
{
/* Clear interrupt flag */
mcf_edma_confirm_interrupt_handled(channel);
/* Set interrupt status flag to TRUE */
mcf_edma_test_interrupt = TRUE;
return IRQ_HANDLED;
}
/********************************************************************/
int
mcf_edma_test_block_compare(u8 *block1, u8 *block2, u32 size)
{
u32 i;
asm("nop;\n");
asm("nop;\n");
for (i = 0; i < (size); i++) {
if ((*(u8 *) (block1 + i)) != (*(u8 *) (block2 + i))) {
printk(KERN_INFO "Invalid edma test value: ");
printk(KERN_INFO "0x%x != 0x%x\n", *(u8 *)(block1 + i),
*(u8 *)(block2 + i));
return FALSE;
}
}
return TRUE;
}
/********************************************************************/
void
mcf_edma_test_run(void)
{
u16 byte_count;
u32 i, j;
u8 *start_address;
u8 *dest_address;
u32 test_data;
int channel;
u32 allocated_channels = 0;
printk(KERN_INFO "\n===============================================\n");
printk(KERN_INFO "\nStarting eDMA transfer tests!\n");
/* Initialize test variables */
byte_count = 0x20;
test_data = 0xA5A5A5A5;
/* DMA buffer must be from GFP_DMA zone, so it will not be cached */
start_address = kmalloc(byte_count, GFP_DMA);
if (start_address == NULL) {
printk(KERN_INFO MCF_EDMA_TEST_DRIVER_NAME
": failed to allocate DMA[%d] buffer\n", byte_count);
goto err_out;
}
dest_address = kmalloc(byte_count, GFP_DMA);
if (dest_address == NULL) {
printk(KERN_INFO MCF_EDMA_TEST_DRIVER_NAME
": failed to allocate DMA[%d] buffer\n", byte_count);
goto err_free_mem;
}
/* Test all automatically allocated DMA channels. The test data is
* complemented at the end of the loop, so that the testData value
* isn't the same twice in a row */
for (i = 0; i < 16; i++) {
/* request eDMA channel */
channel = mcf_edma_request_channel(
/* MCF_EDMA_CHANNEL_ANY*/i,
mcf_edma_test_handler,
NULL,
0x6,
NULL,
NULL,
MCF_EDMA_TEST_DRIVER_NAME);
if (channel < 0)
goto test_end;
allocated_channels |= (1 << channel);
/* Initialize data for DMA to move */
for (j = 0; j < byte_count; j = j + 4)
*((u32 *) (start_address + j)) = test_data;
flush_cache_all();
/* Clear interrupt status indicator */
mcf_edma_test_interrupt = FALSE;
/* Configure DMA Channel TCD */
mcf_edma_set_tcd_params(channel, (u32) start_address,
(u32) dest_address,
(0 | MCF_EDMA_TCD_ATTR_SSIZE_32BIT |
MCF_EDMA_TCD_ATTR_DSIZE_32BIT), 0x04,
byte_count, 0x0, 1, 1, 0x04, 0x0, 0x1,
0x0, 0x0);
/* Start DMA. */
mcf_edma_start_transfer(channel);
printk(KERN_INFO "DMA channel %d testing started.\n", channel);
/* Wait for DMA to complete */
while (!*mcf_edma_test_interrupt_p)
;
/* Test data */
if (mcf_edma_test_block_compare
(start_address, dest_address, byte_count))
printk(KERN_INFO "Data transfered correctly.\n");
else
printk(KERN_INFO "ERROR: Data error!\n");
printk(KERN_INFO "DMA channel %d testing complete.\n", channel);
printk(KERN_INFO "-------------------------------\n");
/* Complement test data so next channel test does not
* use same values */
test_data = ~test_data;
}
test_end:
printk(KERN_INFO "All tests have completed\n\n");
printk(KERN_INFO "Automatically allocated %d eDMA channels:\n", i);
for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
if (allocated_channels & (1 << i)) {
printk(KERN_INFO "%d,\n", i);
mcf_edma_free_channel(i, NULL);
}
}
printk(KERN_INFO "===============================================\n\n");
kfree(dest_address);
err_free_mem:
kfree(start_address);
err_out:
return;
}
/********************************************************************/
static int __init
mcf_edma_test_init(void)
{
mcf_edma_test_run();
/* We intentionaly return -EAGAIN to prevent keeping
* the module. It does all its work from init()
* and doesn't offer any runtime functionality */
return -EAGAIN;
}
static void __exit
mcf_edma_test_exit(void)
{
}
module_init(mcf_edma_test_init);
module_exit(mcf_edma_test_exit);
MODULE_DESCRIPTION(MCF_EDMA_TEST_DRIVER_INFO);
MODULE_AUTHOR(MCF_EDMA_TEST_DRIVER_AUTHOR);
MODULE_LICENSE(MCF_EDMA_TEST_DRIVER_LICENSE);
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