[mirror_ubuntu-bionic-kernel.git] / drivers / dma / dw / regs.h

/*
 * Driver for the Synopsys DesignWare AHB DMA Controller
 *
 * Copyright (C) 2005-2007 Atmel Corporation
 * Copyright (C) 2010-2011 ST Microelectronics
 *
 * 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.
 */

#include <linux/interrupt.h>
#include <linux/dmaengine.h>

#include "internal.h"

#define DW_DMA_MAX_NR_REQUESTS	16

/* flow controller */
enum dw_dma_fc {
	DW_DMA_FC_D_M2M,
	DW_DMA_FC_D_M2P,
	DW_DMA_FC_D_P2M,
	DW_DMA_FC_D_P2P,
	DW_DMA_FC_P_P2M,
	DW_DMA_FC_SP_P2P,
	DW_DMA_FC_P_M2P,
	DW_DMA_FC_DP_P2P,
};

/*
 * Redefine this macro to handle differences between 32- and 64-bit
 * addressing, big vs. little endian, etc.
 */
#define DW_REG(name)		u32 name; u32 __pad_##name

/* Hardware register definitions. */
struct dw_dma_chan_regs {
	DW_REG(SAR);		/* Source Address Register */
	DW_REG(DAR);		/* Destination Address Register */
	DW_REG(LLP);		/* Linked List Pointer */
	u32	CTL_LO;		/* Control Register Low */
	u32	CTL_HI;		/* Control Register High */
	DW_REG(SSTAT);
	DW_REG(DSTAT);
	DW_REG(SSTATAR);
	DW_REG(DSTATAR);
	u32	CFG_LO;		/* Configuration Register Low */
	u32	CFG_HI;		/* Configuration Register High */
	DW_REG(SGR);
	DW_REG(DSR);
};

struct dw_dma_irq_regs {
	DW_REG(XFER);
	DW_REG(BLOCK);
	DW_REG(SRC_TRAN);
	DW_REG(DST_TRAN);
	DW_REG(ERROR);
};

struct dw_dma_regs {
	/* per-channel registers */
	struct dw_dma_chan_regs	CHAN[DW_DMA_MAX_NR_CHANNELS];

	/* irq handling */
	struct dw_dma_irq_regs	RAW;		/* r */
	struct dw_dma_irq_regs	STATUS;		/* r (raw & mask) */
	struct dw_dma_irq_regs	MASK;		/* rw (set = irq enabled) */
	struct dw_dma_irq_regs	CLEAR;		/* w (ack, affects "raw") */

	DW_REG(STATUS_INT);			/* r */

	/* software handshaking */
	DW_REG(REQ_SRC);
	DW_REG(REQ_DST);
	DW_REG(SGL_REQ_SRC);
	DW_REG(SGL_REQ_DST);
	DW_REG(LAST_SRC);
	DW_REG(LAST_DST);

	/* miscellaneous */
	DW_REG(CFG);
	DW_REG(CH_EN);
	DW_REG(ID);
	DW_REG(TEST);

	/* reserved */
	DW_REG(__reserved0);
	DW_REG(__reserved1);

	/* optional encoded params, 0x3c8..0x3f7 */
	u32	__reserved;

	/* per-channel configuration registers */
	u32	DWC_PARAMS[DW_DMA_MAX_NR_CHANNELS];
	u32	MULTI_BLK_TYPE;
	u32	MAX_BLK_SIZE;

	/* top-level parameters */
	u32	DW_PARAMS;
};

/*
 * Big endian I/O access when reading and writing to the DMA controller
 * registers.  This is needed on some platforms, like the Atmel AVR32
 * architecture.
 */

#ifdef CONFIG_DW_DMAC_BIG_ENDIAN_IO
#define dma_readl_native ioread32be
#define dma_writel_native iowrite32be
#else
#define dma_readl_native readl
#define dma_writel_native writel
#endif

/* Bitfields in DW_PARAMS */
#define DW_PARAMS_NR_CHAN	8		/* number of channels */
#define DW_PARAMS_NR_MASTER	11		/* number of AHB masters */
#define DW_PARAMS_DATA_WIDTH(n)	(15 + 2 * (n))
#define DW_PARAMS_DATA_WIDTH1	15		/* master 1 data width */
#define DW_PARAMS_DATA_WIDTH2	17		/* master 2 data width */
#define DW_PARAMS_DATA_WIDTH3	19		/* master 3 data width */
#define DW_PARAMS_DATA_WIDTH4	21		/* master 4 data width */
#define DW_PARAMS_EN		28		/* encoded parameters */

/* Bitfields in DWC_PARAMS */
#define DWC_PARAMS_MBLK_EN	11		/* multi block transfer */

/* bursts size */
enum dw_dma_msize {
	DW_DMA_MSIZE_1,
	DW_DMA_MSIZE_4,
	DW_DMA_MSIZE_8,
	DW_DMA_MSIZE_16,
	DW_DMA_MSIZE_32,
	DW_DMA_MSIZE_64,
	DW_DMA_MSIZE_128,
	DW_DMA_MSIZE_256,
};

/* Bitfields in LLP */
#define DWC_LLP_LMS(x)		((x) & 3)	/* list master select */
#define DWC_LLP_LOC(x)		((x) & ~3)	/* next lli */

/* Bitfields in CTL_LO */
#define DWC_CTLL_INT_EN		(1 << 0)	/* irqs enabled? */
#define DWC_CTLL_DST_WIDTH(n)	((n)<<1)	/* bytes per element */
#define DWC_CTLL_SRC_WIDTH(n)	((n)<<4)
#define DWC_CTLL_DST_INC	(0<<7)		/* DAR update/not */
#define DWC_CTLL_DST_DEC	(1<<7)
#define DWC_CTLL_DST_FIX	(2<<7)
#define DWC_CTLL_SRC_INC	(0<<9)		/* SAR update/not */
#define DWC_CTLL_SRC_DEC	(1<<9)
#define DWC_CTLL_SRC_FIX	(2<<9)
#define DWC_CTLL_DST_MSIZE(n)	((n)<<11)	/* burst, #elements */
#define DWC_CTLL_SRC_MSIZE(n)	((n)<<14)
#define DWC_CTLL_S_GATH_EN	(1 << 17)	/* src gather, !FIX */
#define DWC_CTLL_D_SCAT_EN	(1 << 18)	/* dst scatter, !FIX */
#define DWC_CTLL_FC(n)		((n) << 20)
#define DWC_CTLL_FC_M2M		(0 << 20)	/* mem-to-mem */
#define DWC_CTLL_FC_M2P		(1 << 20)	/* mem-to-periph */
#define DWC_CTLL_FC_P2M		(2 << 20)	/* periph-to-mem */
#define DWC_CTLL_FC_P2P		(3 << 20)	/* periph-to-periph */
/* plus 4 transfer types for peripheral-as-flow-controller */
#define DWC_CTLL_DMS(n)		((n)<<23)	/* dst master select */
#define DWC_CTLL_SMS(n)		((n)<<25)	/* src master select */
#define DWC_CTLL_LLP_D_EN	(1 << 27)	/* dest block chain */
#define DWC_CTLL_LLP_S_EN	(1 << 28)	/* src block chain */

/* Bitfields in CTL_HI */
#define DWC_CTLH_DONE		0x00001000
#define DWC_CTLH_BLOCK_TS_MASK	0x00000fff

/* Bitfields in CFG_LO */
#define DWC_CFGL_CH_PRIOR_MASK	(0x7 << 5)	/* priority mask */
#define DWC_CFGL_CH_PRIOR(x)	((x) << 5)	/* priority */
#define DWC_CFGL_CH_SUSP	(1 << 8)	/* pause xfer */
#define DWC_CFGL_FIFO_EMPTY	(1 << 9)	/* pause xfer */
#define DWC_CFGL_HS_DST		(1 << 10)	/* handshake w/dst */
#define DWC_CFGL_HS_SRC		(1 << 11)	/* handshake w/src */
#define DWC_CFGL_LOCK_CH_XFER	(0 << 12)	/* scope of LOCK_CH */
#define DWC_CFGL_LOCK_CH_BLOCK	(1 << 12)
#define DWC_CFGL_LOCK_CH_XACT	(2 << 12)
#define DWC_CFGL_LOCK_BUS_XFER	(0 << 14)	/* scope of LOCK_BUS */
#define DWC_CFGL_LOCK_BUS_BLOCK	(1 << 14)
#define DWC_CFGL_LOCK_BUS_XACT	(2 << 14)
#define DWC_CFGL_LOCK_CH	(1 << 15)	/* channel lockout */
#define DWC_CFGL_LOCK_BUS	(1 << 16)	/* busmaster lockout */
#define DWC_CFGL_HS_DST_POL	(1 << 18)	/* dst handshake active low */
#define DWC_CFGL_HS_SRC_POL	(1 << 19)	/* src handshake active low */
#define DWC_CFGL_MAX_BURST(x)	((x) << 20)
#define DWC_CFGL_RELOAD_SAR	(1 << 30)
#define DWC_CFGL_RELOAD_DAR	(1 << 31)

/* Bitfields in CFG_HI */
#define DWC_CFGH_FCMODE		(1 << 0)
#define DWC_CFGH_FIFO_MODE	(1 << 1)
#define DWC_CFGH_PROTCTL(x)	((x) << 2)
#define DWC_CFGH_DS_UPD_EN	(1 << 5)
#define DWC_CFGH_SS_UPD_EN	(1 << 6)
#define DWC_CFGH_SRC_PER(x)	((x) << 7)
#define DWC_CFGH_DST_PER(x)	((x) << 11)

/* Bitfields in SGR */
#define DWC_SGR_SGI(x)		((x) << 0)
#define DWC_SGR_SGC(x)		((x) << 20)

/* Bitfields in DSR */
#define DWC_DSR_DSI(x)		((x) << 0)
#define DWC_DSR_DSC(x)		((x) << 20)

/* Bitfields in CFG */
#define DW_CFG_DMA_EN		(1 << 0)

enum dw_dmac_flags {
	DW_DMA_IS_CYCLIC = 0,
	DW_DMA_IS_SOFT_LLP = 1,
	DW_DMA_IS_PAUSED = 2,
	DW_DMA_IS_INITIALIZED = 3,
};

struct dw_dma_chan {
	struct dma_chan			chan;
	void __iomem			*ch_regs;
	u8				mask;
	u8				priority;
	enum dma_transfer_direction	direction;

	/* software emulation of the LLP transfers */
	struct list_head	*tx_node_active;

	spinlock_t		lock;

	/* these other elements are all protected by lock */
	unsigned long		flags;
	struct list_head	active_list;
	struct list_head	queue;
	struct dw_cyclic_desc	*cdesc;

	unsigned int		descs_allocated;

	/* hardware configuration */
	unsigned int		block_size;
	bool			nollp;

	/* custom slave configuration */
	struct dw_dma_slave	dws;

	/* configuration passed via .device_config */
	struct dma_slave_config dma_sconfig;
};

static inline struct dw_dma_chan_regs __iomem *
__dwc_regs(struct dw_dma_chan *dwc)
{
	return dwc->ch_regs;
}

#define channel_readl(dwc, name) \
	dma_readl_native(&(__dwc_regs(dwc)->name))
#define channel_writel(dwc, name, val) \
	dma_writel_native((val), &(__dwc_regs(dwc)->name))

static inline struct dw_dma_chan *to_dw_dma_chan(struct dma_chan *chan)
{
	return container_of(chan, struct dw_dma_chan, chan);
}

struct dw_dma {
	struct dma_device	dma;
	void __iomem		*regs;
	struct dma_pool		*desc_pool;
	struct tasklet_struct	tasklet;

	/* channels */
	struct dw_dma_chan	*chan;
	u8			all_chan_mask;
	u8			in_use;

	/* platform data */
	struct dw_dma_platform_data	*pdata;
};

static inline struct dw_dma_regs __iomem *__dw_regs(struct dw_dma *dw)
{
	return dw->regs;
}

#define dma_readl(dw, name) \
	dma_readl_native(&(__dw_regs(dw)->name))
#define dma_writel(dw, name, val) \
	dma_writel_native((val), &(__dw_regs(dw)->name))

#define channel_set_bit(dw, reg, mask) \
	dma_writel(dw, reg, ((mask) << 8) | (mask))
#define channel_clear_bit(dw, reg, mask) \
	dma_writel(dw, reg, ((mask) << 8) | 0)

static inline struct dw_dma *to_dw_dma(struct dma_device *ddev)
{
	return container_of(ddev, struct dw_dma, dma);
}

#ifdef CONFIG_DW_DMAC_BIG_ENDIAN_IO
typedef __be32 __dw32;
#else
typedef __le32 __dw32;
#endif

/* LLI == Linked List Item; a.k.a. DMA block descriptor */
struct dw_lli {
	/* values that are not changed by hardware */
	__dw32		sar;
	__dw32		dar;
	__dw32		llp;		/* chain to next lli */
	__dw32		ctllo;
	/* values that may get written back: */
	__dw32		ctlhi;
	/* sstat and dstat can snapshot peripheral register state.
	 * silicon config may discard either or both...
	 */
	__dw32		sstat;
	__dw32		dstat;
};

struct dw_desc {
	/* FIRST values the hardware uses */
	struct dw_lli			lli;

#ifdef CONFIG_DW_DMAC_BIG_ENDIAN_IO
#define lli_set(d, reg, v)		((d)->lli.reg |= cpu_to_be32(v))
#define lli_clear(d, reg, v)		((d)->lli.reg &= ~cpu_to_be32(v))
#define lli_read(d, reg)		be32_to_cpu((d)->lli.reg)
#define lli_write(d, reg, v)		((d)->lli.reg = cpu_to_be32(v))
#else
#define lli_set(d, reg, v)		((d)->lli.reg |= cpu_to_le32(v))
#define lli_clear(d, reg, v)		((d)->lli.reg &= ~cpu_to_le32(v))
#define lli_read(d, reg)		le32_to_cpu((d)->lli.reg)
#define lli_write(d, reg, v)		((d)->lli.reg = cpu_to_le32(v))
#endif

	/* THEN values for driver housekeeping */
	struct list_head		desc_node;
	struct list_head		tx_list;
	struct dma_async_tx_descriptor	txd;
	size_t				len;
	size_t				total_len;
	u32				residue;
};

#define to_dw_desc(h)	list_entry(h, struct dw_desc, desc_node)

static inline struct dw_desc *
txd_to_dw_desc(struct dma_async_tx_descriptor *txd)
{
	return container_of(txd, struct dw_desc, txd);
}
Commit	Line	Data
3bfb1d20 HS	1	/*
	2	* Driver for the Synopsys DesignWare AHB DMA Controller
	3	*
	4	* Copyright (C) 2005-2007 Atmel Corporation
aecb7b64	5	* Copyright (C) 2010-2011 ST Microelectronics
3bfb1d20 HS	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
9cade1a4	12	#include <linux/interrupt.h>
0fdb567f	13	#include <linux/dmaengine.h>
3bfb1d20	14
bd2c6636 EP	15	#include "internal.h"
bd2c6636 EP	16
f9c6a655	17	#define DW_DMA_MAX_NR_REQUESTS 16
3bfb1d20	18
a1c46016 VK	19	/* flow controller */
	20	enum dw_dma_fc {
	21	DW_DMA_FC_D_M2M,
	22	DW_DMA_FC_D_M2P,
	23	DW_DMA_FC_D_P2M,
	24	DW_DMA_FC_D_P2P,
	25	DW_DMA_FC_P_P2M,
	26	DW_DMA_FC_SP_P2P,
	27	DW_DMA_FC_P_M2P,
	28	DW_DMA_FC_DP_P2P,
	29	};
	30
3bfb1d20 HS	31	/*
	32	* Redefine this macro to handle differences between 32- and 64-bit
	33	* addressing, big vs. little endian, etc.
	34	*/
	35	#define DW_REG(name) u32 name; u32 __pad_##name
	36
	37	/* Hardware register definitions. */
	38	struct dw_dma_chan_regs {
	39	DW_REG(SAR); /* Source Address Register */
	40	DW_REG(DAR); /* Destination Address Register */
	41	DW_REG(LLP); /* Linked List Pointer */
	42	u32 CTL_LO; /* Control Register Low */
	43	u32 CTL_HI; /* Control Register High */
	44	DW_REG(SSTAT);
	45	DW_REG(DSTAT);
	46	DW_REG(SSTATAR);
	47	DW_REG(DSTATAR);
	48	u32 CFG_LO; /* Configuration Register Low */
	49	u32 CFG_HI; /* Configuration Register High */
	50	DW_REG(SGR);
	51	DW_REG(DSR);
	52	};
	53
	54	struct dw_dma_irq_regs {
	55	DW_REG(XFER);
	56	DW_REG(BLOCK);
	57	DW_REG(SRC_TRAN);
	58	DW_REG(DST_TRAN);
	59	DW_REG(ERROR);
	60	};
	61
	62	struct dw_dma_regs {
	63	/* per-channel registers */
	64	struct dw_dma_chan_regs CHAN[DW_DMA_MAX_NR_CHANNELS];
	65
	66	/* irq handling */
	67	struct dw_dma_irq_regs RAW; /* r */
	68	struct dw_dma_irq_regs STATUS; /* r (raw & mask) */
	69	struct dw_dma_irq_regs MASK; /* rw (set = irq enabled) */
	70	struct dw_dma_irq_regs CLEAR; /* w (ack, affects "raw") */
	71
	72	DW_REG(STATUS_INT); /* r */
	73
	74	/* software handshaking */
	75	DW_REG(REQ_SRC);
	76	DW_REG(REQ_DST);
	77	DW_REG(SGL_REQ_SRC);
	78	DW_REG(SGL_REQ_DST);
	79	DW_REG(LAST_SRC);
	80	DW_REG(LAST_DST);
	81
	82	/* miscellaneous */
	83	DW_REG(CFG);
	84	DW_REG(CH_EN);
	85	DW_REG(ID);
	86	DW_REG(TEST);
	87
2a9fe9ae AS	88	/* reserved */
	89	DW_REG(__reserved0);
	90	DW_REG(__reserved1);
	91
745664eb	92	/* optional encoded params, 0x3c8..0x3f7 */
2a9fe9ae AS	93	u32 __reserved;
	94
	95	/* per-channel configuration registers */
	96	u32 DWC_PARAMS[DW_DMA_MAX_NR_CHANNELS];
	97	u32 MULTI_BLK_TYPE;
	98	u32 MAX_BLK_SIZE;
	99
	100	/* top-level parameters */
	101	u32 DW_PARAMS;
3bfb1d20 HS	102	};
3bfb1d20 HS	103
e368b510 VK	104	/*
	105	* Big endian I/O access when reading and writing to the DMA controller
	106	* registers. This is needed on some platforms, like the Atmel AVR32
	107	* architecture.
	108	*/
	109
d5ea7b5e HT	110	#ifdef CONFIG_DW_DMAC_BIG_ENDIAN_IO
	111	#define dma_readl_native ioread32be
	112	#define dma_writel_native iowrite32be
	113	#else
	114	#define dma_readl_native readl
	115	#define dma_writel_native writel
	116	#endif
	117
2a9fe9ae AS	118	/* Bitfields in DW_PARAMS */
	119	#define DW_PARAMS_NR_CHAN 8 /* number of channels */
	120	#define DW_PARAMS_NR_MASTER 11 /* number of AHB masters */
	121	#define DW_PARAMS_DATA_WIDTH(n) (15 + 2 * (n))
	122	#define DW_PARAMS_DATA_WIDTH1 15 /* master 1 data width */
	123	#define DW_PARAMS_DATA_WIDTH2 17 /* master 2 data width */
	124	#define DW_PARAMS_DATA_WIDTH3 19 /* master 3 data width */
	125	#define DW_PARAMS_DATA_WIDTH4 21 /* master 4 data width */
	126	#define DW_PARAMS_EN 28 /* encoded parameters */
	127
	128	/* Bitfields in DWC_PARAMS */
	129	#define DWC_PARAMS_MBLK_EN 11 /* multi block transfer */
	130
46e8c83c AS	131	/* bursts size */
	132	enum dw_dma_msize {
	133	DW_DMA_MSIZE_1,
	134	DW_DMA_MSIZE_4,
	135	DW_DMA_MSIZE_8,
	136	DW_DMA_MSIZE_16,
	137	DW_DMA_MSIZE_32,
	138	DW_DMA_MSIZE_64,
	139	DW_DMA_MSIZE_128,
	140	DW_DMA_MSIZE_256,
	141	};
	142
2a0fae02 MR	143	/* Bitfields in LLP */
	144	#define DWC_LLP_LMS(x) ((x) & 3) /* list master select */
	145	#define DWC_LLP_LOC(x) ((x) & ~3) /* next lli */
	146
3bfb1d20 HS	147	/* Bitfields in CTL_LO */
	148	#define DWC_CTLL_INT_EN (1 << 0) /* irqs enabled? */
	149	#define DWC_CTLL_DST_WIDTH(n) ((n)<<1) /* bytes per element */
	150	#define DWC_CTLL_SRC_WIDTH(n) ((n)<<4)
	151	#define DWC_CTLL_DST_INC (0<<7) /* DAR update/not */
	152	#define DWC_CTLL_DST_DEC (1<<7)
	153	#define DWC_CTLL_DST_FIX (2<<7)
c9784a46	154	#define DWC_CTLL_SRC_INC (0<<9) /* SAR update/not */
3bfb1d20 HS	155	#define DWC_CTLL_SRC_DEC (1<<9)
	156	#define DWC_CTLL_SRC_FIX (2<<9)
	157	#define DWC_CTLL_DST_MSIZE(n) ((n)<<11) /* burst, #elements */
	158	#define DWC_CTLL_SRC_MSIZE(n) ((n)<<14)
	159	#define DWC_CTLL_S_GATH_EN (1 << 17) /* src gather, !FIX */
	160	#define DWC_CTLL_D_SCAT_EN (1 << 18) /* dst scatter, !FIX */
ee66509d	161	#define DWC_CTLL_FC(n) ((n) << 20)
3bfb1d20 HS	162	#define DWC_CTLL_FC_M2M (0 << 20) /* mem-to-mem */
	163	#define DWC_CTLL_FC_M2P (1 << 20) /* mem-to-periph */
	164	#define DWC_CTLL_FC_P2M (2 << 20) /* periph-to-mem */
	165	#define DWC_CTLL_FC_P2P (3 << 20) /* periph-to-periph */
	166	/* plus 4 transfer types for peripheral-as-flow-controller */
	167	#define DWC_CTLL_DMS(n) ((n)<<23) /* dst master select */
	168	#define DWC_CTLL_SMS(n) ((n)<<25) /* src master select */
	169	#define DWC_CTLL_LLP_D_EN (1 << 27) /* dest block chain */
	170	#define DWC_CTLL_LLP_S_EN (1 << 28) /* src block chain */
	171
	172	/* Bitfields in CTL_HI */
	173	#define DWC_CTLH_DONE 0x00001000
	174	#define DWC_CTLH_BLOCK_TS_MASK 0x00000fff
	175
46e8c83c	176	/* Bitfields in CFG_LO */
93317e8e VK	177	#define DWC_CFGL_CH_PRIOR_MASK (0x7 << 5) /* priority mask */
93317e8e VK	178	#define DWC_CFGL_CH_PRIOR(x) ((x) << 5) /* priority */
3bfb1d20 HS	179	#define DWC_CFGL_CH_SUSP (1 << 8) /* pause xfer */
	180	#define DWC_CFGL_FIFO_EMPTY (1 << 9) /* pause xfer */
	181	#define DWC_CFGL_HS_DST (1 << 10) /* handshake w/dst */
	182	#define DWC_CFGL_HS_SRC (1 << 11) /* handshake w/src */
46e8c83c AS	183	#define DWC_CFGL_LOCK_CH_XFER (0 << 12) /* scope of LOCK_CH */
	184	#define DWC_CFGL_LOCK_CH_BLOCK (1 << 12)
	185	#define DWC_CFGL_LOCK_CH_XACT (2 << 12)
	186	#define DWC_CFGL_LOCK_BUS_XFER (0 << 14) /* scope of LOCK_BUS */
	187	#define DWC_CFGL_LOCK_BUS_BLOCK (1 << 14)
	188	#define DWC_CFGL_LOCK_BUS_XACT (2 << 14)
	189	#define DWC_CFGL_LOCK_CH (1 << 15) /* channel lockout */
	190	#define DWC_CFGL_LOCK_BUS (1 << 16) /* busmaster lockout */
	191	#define DWC_CFGL_HS_DST_POL (1 << 18) /* dst handshake active low */
	192	#define DWC_CFGL_HS_SRC_POL (1 << 19) /* src handshake active low */
3bfb1d20 HS	193	#define DWC_CFGL_MAX_BURST(x) ((x) << 20)
	194	#define DWC_CFGL_RELOAD_SAR (1 << 30)
	195	#define DWC_CFGL_RELOAD_DAR (1 << 31)
	196
46e8c83c AS	197	/* Bitfields in CFG_HI */
	198	#define DWC_CFGH_FCMODE (1 << 0)
	199	#define DWC_CFGH_FIFO_MODE (1 << 1)
	200	#define DWC_CFGH_PROTCTL(x) ((x) << 2)
3bfb1d20 HS	201	#define DWC_CFGH_DS_UPD_EN (1 << 5)
3bfb1d20 HS	202	#define DWC_CFGH_SS_UPD_EN (1 << 6)
46e8c83c AS	203	#define DWC_CFGH_SRC_PER(x) ((x) << 7)
46e8c83c AS	204	#define DWC_CFGH_DST_PER(x) ((x) << 11)
3bfb1d20 HS	205
	206	/* Bitfields in SGR */
	207	#define DWC_SGR_SGI(x) ((x) << 0)
	208	#define DWC_SGR_SGC(x) ((x) << 20)
	209
	210	/* Bitfields in DSR */
	211	#define DWC_DSR_DSI(x) ((x) << 0)
	212	#define DWC_DSR_DSC(x) ((x) << 20)
	213
	214	/* Bitfields in CFG */
	215	#define DW_CFG_DMA_EN (1 << 0)
	216
d9de4519 HCE	217	enum dw_dmac_flags {
d9de4519 HCE	218	DW_DMA_IS_CYCLIC = 0,
fed2574b	219	DW_DMA_IS_SOFT_LLP = 1,
5e09f98e	220	DW_DMA_IS_PAUSED = 2,
423f9cbf	221	DW_DMA_IS_INITIALIZED = 3,
d9de4519 HCE	222	};
d9de4519 HCE	223
3bfb1d20	224	struct dw_dma_chan {
0fdb567f AS	225	struct dma_chan chan;
	226	void __iomem *ch_regs;
	227	u8 mask;
	228	u8 priority;
	229	enum dma_transfer_direction direction;
3bfb1d20	230
fed2574b	231	/* software emulation of the LLP transfers */
fed2574b AS	232	struct list_head *tx_node_active;
fed2574b AS	233
3bfb1d20 HS	234	spinlock_t lock;
	235
	236	/* these other elements are all protected by lock */
d9de4519	237	unsigned long flags;
3bfb1d20 HS	238	struct list_head active_list;
3bfb1d20 HS	239	struct list_head queue;
d9de4519	240	struct dw_cyclic_desc *cdesc;
3bfb1d20	241
3bfb1d20	242	unsigned int descs_allocated;
327e6970	243
4a63a8b3 AS	244	/* hardware configuration */
4a63a8b3 AS	245	unsigned int block_size;
fed2574b	246	bool nollp;
f776076b AB	247
f776076b AB	248	/* custom slave configuration */
9217a5bf	249	struct dw_dma_slave dws;
4a63a8b3	250
295d3e10	251	/* configuration passed via .device_config */
327e6970	252	struct dma_slave_config dma_sconfig;
3bfb1d20 HS	253	};
	254
	255	static inline struct dw_dma_chan_regs __iomem *
	256	__dwc_regs(struct dw_dma_chan *dwc)
	257	{
	258	return dwc->ch_regs;
	259	}
	260
	261	#define channel_readl(dwc, name) \
d5ea7b5e	262	dma_readl_native(&(__dwc_regs(dwc)->name))
3bfb1d20	263	#define channel_writel(dwc, name, val) \
d5ea7b5e	264	dma_writel_native((val), &(__dwc_regs(dwc)->name))
3bfb1d20 HS	265
	266	static inline struct dw_dma_chan to_dw_dma_chan(struct dma_chan chan)
	267	{
	268	return container_of(chan, struct dw_dma_chan, chan);
	269	}
	270
3bfb1d20 HS	271	struct dw_dma {
	272	struct dma_device dma;
	273	void __iomem *regs;
f8122a82	274	struct dma_pool *desc_pool;
3bfb1d20	275	struct tasklet_struct tasklet;
3bfb1d20	276
000871ce AS	277	/* channels */
000871ce AS	278	struct dw_dma_chan *chan;
3bfb1d20	279	u8 all_chan_mask;
99d9bf4e	280	u8 in_use;
3bfb1d20	281
161c3d04 AS	282	/* platform data */
161c3d04 AS	283	struct dw_dma_platform_data *pdata;
3bfb1d20 HS	284	};
	285
	286	static inline struct dw_dma_regs __iomem __dw_regs(struct dw_dma dw)
	287	{
	288	return dw->regs;
	289	}
	290
	291	#define dma_readl(dw, name) \
d5ea7b5e	292	dma_readl_native(&(__dw_regs(dw)->name))
3bfb1d20	293	#define dma_writel(dw, name, val) \
d5ea7b5e	294	dma_writel_native((val), &(__dw_regs(dw)->name))
3bfb1d20 HS	295
	296	#define channel_set_bit(dw, reg, mask) \
	297	dma_writel(dw, reg, ((mask) << 8) \| (mask))
	298	#define channel_clear_bit(dw, reg, mask) \
	299	dma_writel(dw, reg, ((mask) << 8) \| 0)
	300
	301	static inline struct dw_dma to_dw_dma(struct dma_device ddev)
	302	{
	303	return container_of(ddev, struct dw_dma, dma);
	304	}
	305
df1f3a23 MR	306	#ifdef CONFIG_DW_DMAC_BIG_ENDIAN_IO
	307	typedef __be32 __dw32;
	308	#else
	309	typedef __le32 __dw32;
	310	#endif
	311
3bfb1d20 HS	312	/* LLI == Linked List Item; a.k.a. DMA block descriptor */
	313	struct dw_lli {
	314	/* values that are not changed by hardware */
df1f3a23 MR	315	__dw32 sar;
	316	__dw32 dar;
	317	__dw32 llp; /* chain to next lli */
	318	__dw32 ctllo;
3bfb1d20	319	/* values that may get written back: */
df1f3a23	320	__dw32 ctlhi;
3bfb1d20 HS	321	/* sstat and dstat can snapshot peripheral register state.
	322	* silicon config may discard either or both...
	323	*/
df1f3a23 MR	324	__dw32 sstat;
df1f3a23 MR	325	__dw32 dstat;
3bfb1d20 HS	326	};
	327
	328	struct dw_desc {
	329	/* FIRST values the hardware uses */
	330	struct dw_lli lli;
	331
df1f3a23 MR	332	#ifdef CONFIG_DW_DMAC_BIG_ENDIAN_IO
	333	#define lli_set(d, reg, v) ((d)->lli.reg \|= cpu_to_be32(v))
	334	#define lli_clear(d, reg, v) ((d)->lli.reg &= ~cpu_to_be32(v))
	335	#define lli_read(d, reg) be32_to_cpu((d)->lli.reg)
	336	#define lli_write(d, reg, v) ((d)->lli.reg = cpu_to_be32(v))
	337	#else
	338	#define lli_set(d, reg, v) ((d)->lli.reg \|= cpu_to_le32(v))
	339	#define lli_clear(d, reg, v) ((d)->lli.reg &= ~cpu_to_le32(v))
	340	#define lli_read(d, reg) le32_to_cpu((d)->lli.reg)
	341	#define lli_write(d, reg, v) ((d)->lli.reg = cpu_to_le32(v))
	342	#endif
	343
3bfb1d20 HS	344	/* THEN values for driver housekeeping */
3bfb1d20 HS	345	struct list_head desc_node;
e0bd0f8c	346	struct list_head tx_list;
3bfb1d20 HS	347	struct dma_async_tx_descriptor txd;
3bfb1d20 HS	348	size_t len;
30d38a32	349	size_t total_len;
b68fd097	350	u32 residue;
3bfb1d20 HS	351	};
3bfb1d20 HS	352
e63a47a3 AS	353	#define to_dw_desc(h) list_entry(h, struct dw_desc, desc_node)
e63a47a3 AS	354
3bfb1d20 HS	355	static inline struct dw_desc *
	356	txd_to_dw_desc(struct dma_async_tx_descriptor *txd)
	357	{
	358	return container_of(txd, struct dw_desc, txd);
	359	}