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/*
* Driver for the High Speed UART DMA
*
* Copyright (C) 2015 Intel Corporation
*
* Partially based on the bits found in drivers/tty/serial/mfd.c.
*
* 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.
*/
#ifndef __DMA_HSU_H__
#define __DMA_HSU_H__
#include <linux/spinlock.h>
#include <linux/dma/hsu.h>
#include "../virt-dma.h"
#define HSU_CH_SR 0x00 /* channel status */
#define HSU_CH_CR 0x04 /* channel control */
#define HSU_CH_DCR 0x08 /* descriptor control */
#define HSU_CH_BSR 0x10 /* FIFO buffer size */
#define HSU_CH_MTSR 0x14 /* minimum transfer size */
#define HSU_CH_DxSAR(x) (0x20 + 8 * (x)) /* desc start addr */
#define HSU_CH_DxTSR(x) (0x24 + 8 * (x)) /* desc transfer size */
#define HSU_CH_D0SAR 0x20 /* desc 0 start addr */
#define HSU_CH_D0TSR 0x24 /* desc 0 transfer size */
#define HSU_CH_D1SAR 0x28
#define HSU_CH_D1TSR 0x2c
#define HSU_CH_D2SAR 0x30
#define HSU_CH_D2TSR 0x34
#define HSU_CH_D3SAR 0x38
#define HSU_CH_D3TSR 0x3c
#define HSU_DMA_CHAN_NR_DESC 4
#define HSU_DMA_CHAN_LENGTH 0x40
/* Bits in HSU_CH_SR */
#define HSU_CH_SR_DESCTO(x) BIT(8 + (x))
#define HSU_CH_SR_DESCTO_ANY (BIT(11) | BIT(10) | BIT(9) | BIT(8))
#define HSU_CH_SR_CHE BIT(15)
#define HSU_CH_SR_DESCE(x) BIT(16 + (x))
#define HSU_CH_SR_DESCE_ANY (BIT(19) | BIT(18) | BIT(17) | BIT(16))
#define HSU_CH_SR_CDESC_ANY (BIT(31) | BIT(30))
/* Bits in HSU_CH_CR */
#define HSU_CH_CR_CHA BIT(0)
#define HSU_CH_CR_CHD BIT(1)
/* Bits in HSU_CH_DCR */
#define HSU_CH_DCR_DESCA(x) BIT(0 + (x))
#define HSU_CH_DCR_CHSOD(x) BIT(8 + (x))
#define HSU_CH_DCR_CHSOTO BIT(14)
#define HSU_CH_DCR_CHSOE BIT(15)
#define HSU_CH_DCR_CHDI(x) BIT(16 + (x))
#define HSU_CH_DCR_CHEI BIT(23)
#define HSU_CH_DCR_CHTOI(x) BIT(24 + (x))
struct hsu_dma_sg {
dma_addr_t addr;
unsigned int len;
};
struct hsu_dma_desc {
struct virt_dma_desc vdesc;
enum dma_transfer_direction direction;
struct hsu_dma_sg *sg;
unsigned int nents;
size_t length;
unsigned int active;
enum dma_status status;
};
static inline struct hsu_dma_desc *to_hsu_dma_desc(struct virt_dma_desc *vdesc)
{
return container_of(vdesc, struct hsu_dma_desc, vdesc);
}
struct hsu_dma_chan {
struct virt_dma_chan vchan;
void __iomem *reg;
/* hardware configuration */
enum dma_transfer_direction direction;
struct dma_slave_config config;
struct hsu_dma_desc *desc;
};
static inline struct hsu_dma_chan *to_hsu_dma_chan(struct dma_chan *chan)
{
return container_of(chan, struct hsu_dma_chan, vchan.chan);
}
static inline u32 hsu_chan_readl(struct hsu_dma_chan *hsuc, int offset)
{
return readl(hsuc->reg + offset);
}
static inline void hsu_chan_writel(struct hsu_dma_chan *hsuc, int offset,
u32 value)
{
writel(value, hsuc->reg + offset);
}
struct hsu_dma {
struct dma_device dma;
/* channels */
struct hsu_dma_chan *chan;
unsigned short nr_channels;
};
static inline struct hsu_dma *to_hsu_dma(struct dma_device *ddev)
{
return container_of(ddev, struct hsu_dma, dma);
}
#endif /* __DMA_HSU_H__ */
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