Commit d642a8ad authored by Graf Yang's avatar Graf Yang Committed by Bryan Wu
Browse files

Blackfin arch: implement support for /proc/dma 



Signed-off-by: default avatarGraf Yang <graf.yang@analog.com>
Signed-off-by: default avatarBryan Wu <cooloney@kernel.org>
parent dbc895f9

arch/blackfin/kernel/bfin_dma_5xx.c

+40 −4
Original line number Diff line number Diff line
@@ -29,7 +29,9 @@ 


#include <linux/errno.h>

#include <linux/module.h>

#include <linux/proc_fs.h>

#include <linux/sched.h>

#include <linux/seq_file.h>

#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <linux/param.h>
@@ -67,26 +69,60 @@ static int __init blackfin_dma_init(void) 
		mutex_init(&(dma_ch[i].dmalock));

	}

	/* Mark MEMDMA Channel 0 as requested since we're using it internally */

	dma_ch[CH_MEM_STREAM0_DEST].chan_status = DMA_CHANNEL_REQUESTED;

	dma_ch[CH_MEM_STREAM0_SRC].chan_status = DMA_CHANNEL_REQUESTED;

	request_dma(CH_MEM_STREAM0_DEST, "Blackfin dma_memcpy");

	request_dma(CH_MEM_STREAM0_SRC, "Blackfin dma_memcpy");



#if defined(CONFIG_DEB_DMA_URGENT)

	bfin_write_EBIU_DDRQUE(bfin_read_EBIU_DDRQUE()

			 | DEB1_URGENT | DEB2_URGENT | DEB3_URGENT);

#endif



	return 0;

}



arch_initcall(blackfin_dma_init);



#ifdef CONFIG_PROC_FS



static int proc_dma_show(struct seq_file *m, void *v)

{

	int i;



	for (i = 0 ; i < MAX_BLACKFIN_DMA_CHANNEL; ++i)

		if (dma_ch[i].chan_status != DMA_CHANNEL_FREE)

			seq_printf(m, "%2d: %s\n", i, dma_ch[i].device_id);



	return 0;

}



static int proc_dma_open(struct inode *inode, struct file *file)

{

	return single_open(file, proc_dma_show, NULL);

}



static const struct file_operations proc_dma_operations = {

	.open		= proc_dma_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};



static int __init proc_dma_init(void)

{

	return proc_create("dma", 0, NULL, &proc_dma_operations) != NULL;

}

late_initcall(proc_dma_init);

#endif



/*------------------------------------------------------------------------------

 *	Request the specific DMA channel from the system.

 *-----------------------------------------------------------------------------*/

int request_dma(unsigned int channel, char *device_id)

{



	pr_debug("request_dma() : BEGIN \n");



	if (device_id == NULL)

		printk(KERN_WARNING "request_dma(%u): no device_id given\n", channel);



#if defined(CONFIG_BF561) && ANOMALY_05000182

	if (channel >= CH_IMEM_STREAM0_DEST && channel <= CH_IMEM_STREAM1_DEST) {

		if (get_cclk() > 500000000) {