127 lines
3.2 KiB
C
127 lines
3.2 KiB
C
/*
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* Driver for the High Speed UART DMA
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*
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* Copyright (C) 2015 Intel Corporation
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*
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* Partially based on the bits found in drivers/tty/serial/mfd.c.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __DMA_HSU_H__
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#define __DMA_HSU_H__
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#include <linux/spinlock.h>
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#include <linux/dma/hsu.h>
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#include "../virt-dma.h"
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#define HSU_CH_SR 0x00 /* channel status */
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#define HSU_CH_CR 0x04 /* channel control */
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#define HSU_CH_DCR 0x08 /* descriptor control */
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#define HSU_CH_BSR 0x10 /* FIFO buffer size */
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#define HSU_CH_MTSR 0x14 /* minimum transfer size */
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#define HSU_CH_DxSAR(x) (0x20 + 8 * (x)) /* desc start addr */
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#define HSU_CH_DxTSR(x) (0x24 + 8 * (x)) /* desc transfer size */
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#define HSU_CH_D0SAR 0x20 /* desc 0 start addr */
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#define HSU_CH_D0TSR 0x24 /* desc 0 transfer size */
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#define HSU_CH_D1SAR 0x28
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#define HSU_CH_D1TSR 0x2c
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#define HSU_CH_D2SAR 0x30
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#define HSU_CH_D2TSR 0x34
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#define HSU_CH_D3SAR 0x38
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#define HSU_CH_D3TSR 0x3c
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#define HSU_DMA_CHAN_NR_DESC 4
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#define HSU_DMA_CHAN_LENGTH 0x40
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/* Bits in HSU_CH_SR */
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#define HSU_CH_SR_DESCTO(x) BIT(8 + (x))
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#define HSU_CH_SR_DESCTO_ANY (BIT(11) | BIT(10) | BIT(9) | BIT(8))
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#define HSU_CH_SR_CHE BIT(15)
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#define HSU_CH_SR_DESCE(x) BIT(16 + (x))
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#define HSU_CH_SR_DESCE_ANY (BIT(19) | BIT(18) | BIT(17) | BIT(16))
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#define HSU_CH_SR_CDESC_ANY (BIT(31) | BIT(30))
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/* Bits in HSU_CH_CR */
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#define HSU_CH_CR_CHA BIT(0)
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#define HSU_CH_CR_CHD BIT(1)
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/* Bits in HSU_CH_DCR */
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#define HSU_CH_DCR_DESCA(x) BIT(0 + (x))
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#define HSU_CH_DCR_CHSOD(x) BIT(8 + (x))
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#define HSU_CH_DCR_CHSOTO BIT(14)
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#define HSU_CH_DCR_CHSOE BIT(15)
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#define HSU_CH_DCR_CHDI(x) BIT(16 + (x))
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#define HSU_CH_DCR_CHEI BIT(23)
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#define HSU_CH_DCR_CHTOI(x) BIT(24 + (x))
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/* Bits in HSU_CH_DxTSR */
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#define HSU_CH_DxTSR_MASK GENMASK(15, 0)
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#define HSU_CH_DxTSR_TSR(x) ((x) & HSU_CH_DxTSR_MASK)
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struct hsu_dma_sg {
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dma_addr_t addr;
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unsigned int len;
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};
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struct hsu_dma_desc {
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struct virt_dma_desc vdesc;
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enum dma_transfer_direction direction;
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struct hsu_dma_sg *sg;
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unsigned int nents;
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size_t length;
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unsigned int active;
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enum dma_status status;
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};
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static inline struct hsu_dma_desc *to_hsu_dma_desc(struct virt_dma_desc *vdesc)
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{
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return container_of(vdesc, struct hsu_dma_desc, vdesc);
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}
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struct hsu_dma_chan {
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struct virt_dma_chan vchan;
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void __iomem *reg;
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/* hardware configuration */
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enum dma_transfer_direction direction;
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struct dma_slave_config config;
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struct hsu_dma_desc *desc;
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};
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static inline struct hsu_dma_chan *to_hsu_dma_chan(struct dma_chan *chan)
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{
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return container_of(chan, struct hsu_dma_chan, vchan.chan);
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}
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static inline u32 hsu_chan_readl(struct hsu_dma_chan *hsuc, int offset)
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{
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return readl(hsuc->reg + offset);
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}
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static inline void hsu_chan_writel(struct hsu_dma_chan *hsuc, int offset,
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u32 value)
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{
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writel(value, hsuc->reg + offset);
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}
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struct hsu_dma {
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struct dma_device dma;
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/* channels */
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struct hsu_dma_chan *chan;
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unsigned short nr_channels;
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};
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static inline struct hsu_dma *to_hsu_dma(struct dma_device *ddev)
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{
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return container_of(ddev, struct hsu_dma, dma);
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}
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#endif /* __DMA_HSU_H__ */
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