path: root/drivers/dma/stm32-mdma.c

/*
 *
 * Copyright (C) STMicroelectronics SA 2017
 * Author(s): M'boumba Cedric Madianga <cedric.madianga@gmail.com>
 *            Pierre-Yves Mordret <pierre-yves.mordret@st.com>
 *
 * License terms: GPL V2.0.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * 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.
 *
 * Driver for STM32 MDMA controller
 *
 * Inspired by stm32-dma.c and dma-jz4780.c
 *
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/iopoll.h>
#include <linux/jiffies.h>
#include <linux/list.h>
#include <linux/log2.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/slab.h>

#include "virt-dma.h"

/*  MDMA Generic getter/setter */
#define STM32_MDMA_SHIFT(n)		(ffs(n) - 1)
#define STM32_MDMA_SET(n, mask)		(((n) << STM32_MDMA_SHIFT(mask)) & \
					 (mask))
#define STM32_MDMA_GET(n, mask)		(((n) & (mask)) >> \
					 STM32_MDMA_SHIFT(mask))

#define STM32_MDMA_GISR0		0x0000 /* MDMA Int Status Reg 1 */
#define STM32_MDMA_GISR1		0x0004 /* MDMA Int Status Reg 2 */

/* MDMA Channel x interrupt/status register */
#define STM32_MDMA_CISR(x)		(0x40 + 0x40 * (x)) /* x = 0..62 */
#define STM32_MDMA_CISR_CRQA		BIT(16)
#define STM32_MDMA_CISR_TCIF		BIT(4)
#define STM32_MDMA_CISR_BTIF		BIT(3)
#define STM32_MDMA_CISR_B