[net-next-2.6.git] / drivers / dma / dw_dmac_regs.h

/*
 * Driver for the Synopsys DesignWare AHB DMA Controller
 *
 * Copyright (C) 2005-2007 Atmel Corporation
 *
 * 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/dw_dmac.h>

#define DW_DMA_MAX_NR_CHANNELS	8

/*
 * 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);

	/* optional encoded params, 0x3c8..0x3 */
};

/* 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<<7)		/* 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_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. Platform-configurable bits are in <linux/dw_dmac.h> */
#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_MAX_BURST(x)	((x) << 20)
#define DWC_CFGL_RELOAD_SAR	(1 << 30)
#define DWC_CFGL_RELOAD_DAR	(1 << 31)

/* Bitfields in CFG_HI. Platform-configurable bits are in <linux/dw_dmac.h> */
#define DWC_CFGH_DS_UPD_EN	(1 << 5)
#define DWC_CFGH_SS_UPD_EN	(1 << 6)

/* 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)

#define DW_REGLEN		0x400

enum dw_dmac_flags {
	DW_DMA_IS_CYCLIC = 0,
};

struct dw_dma_chan {
	struct dma_chan		chan;
	void __iomem		*ch_regs;
	u8			mask;

	spinlock_t		lock;

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

	unsigned int		descs_allocated;
};

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

#define channel_readl(dwc, name) \
	__raw_readl(&(__dwc_regs(dwc)->name))
#define channel_writel(dwc, name, val) \
	__raw_writel((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 tasklet_struct	tasklet;
	struct clk		*clk;

	u8			all_chan_mask;

	struct dw_dma_chan	chan[0];
};

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

#define dma_readl(dw, name) \
	__raw_readl(&(__dw_regs(dw)->name))
#define dma_writel(dw, name, val) \
	__raw_writel((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);
}

/* LLI == Linked List Item; a.k.a. DMA block descriptor */
struct dw_lli {
	/* values that are not changed by hardware */
	dma_addr_t	sar;
	dma_addr_t	dar;
	dma_addr_t	llp;		/* chain to next lli */
	u32		ctllo;
	/* values that may get written back: */
	u32		ctlhi;
	/* sstat and dstat can snapshot peripheral register state.
	 * silicon config may discard either or both...
	 */
	u32		sstat;
	u32		dstat;
};

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

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

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
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/dw_dmac.h>
	12
	13	#define DW_DMA_MAX_NR_CHANNELS 8
	14
	15	/*
	16	* Redefine this macro to handle differences between 32- and 64-bit
	17	* addressing, big vs. little endian, etc.
	18	*/
	19	#define DW_REG(name) u32 name; u32 __pad_##name
	20
	21	/* Hardware register definitions. */
	22	struct dw_dma_chan_regs {
	23	DW_REG(SAR); /* Source Address Register */
	24	DW_REG(DAR); /* Destination Address Register */
	25	DW_REG(LLP); /* Linked List Pointer */
	26	u32 CTL_LO; /* Control Register Low */
	27	u32 CTL_HI; /* Control Register High */
	28	DW_REG(SSTAT);
	29	DW_REG(DSTAT);
	30	DW_REG(SSTATAR);
	31	DW_REG(DSTATAR);
	32	u32 CFG_LO; /* Configuration Register Low */
	33	u32 CFG_HI; /* Configuration Register High */
	34	DW_REG(SGR);
	35	DW_REG(DSR);
	36	};
	37
	38	struct dw_dma_irq_regs {
	39	DW_REG(XFER);
	40	DW_REG(BLOCK);
	41	DW_REG(SRC_TRAN);
	42	DW_REG(DST_TRAN);
	43	DW_REG(ERROR);
	44	};
	45
	46	struct dw_dma_regs {
	47	/* per-channel registers */
	48	struct dw_dma_chan_regs CHAN[DW_DMA_MAX_NR_CHANNELS];
	49
	50	/* irq handling */
	51	struct dw_dma_irq_regs RAW; /* r */
	52	struct dw_dma_irq_regs STATUS; /* r (raw & mask) */
	53	struct dw_dma_irq_regs MASK; /* rw (set = irq enabled) */
	54	struct dw_dma_irq_regs CLEAR; /* w (ack, affects "raw") */
	55
	56	DW_REG(STATUS_INT); /* r */
	57
	58	/* software handshaking */
	59	DW_REG(REQ_SRC);
	60	DW_REG(REQ_DST);
	61	DW_REG(SGL_REQ_SRC);
	62	DW_REG(SGL_REQ_DST);
	63	DW_REG(LAST_SRC);
	64	DW_REG(LAST_DST);
65
66	/* miscellaneous */
67	DW_REG(CFG);
68	DW_REG(CH_EN);
69	DW_REG(ID);
70	DW_REG(TEST);
71
72	/* optional encoded params, 0x3c8..0x3 */
73	};
74
75	/* Bitfields in CTL_LO */
76	#define DWC_CTLL_INT_EN (1 << 0) /* irqs enabled? */
77	#define DWC_CTLL_DST_WIDTH(n) ((n)<<1) /* bytes per element */
78	#define DWC_CTLL_SRC_WIDTH(n) ((n)<<4)
79	#define DWC_CTLL_DST_INC (0<<7) /* DAR update/not */
80	#define DWC_CTLL_DST_DEC (1<<7)
81	#define DWC_CTLL_DST_FIX (2<<7)
82	#define DWC_CTLL_SRC_INC (0<<7) /* SAR update/not */
83	#define DWC_CTLL_SRC_DEC (1<<9)
84	#define DWC_CTLL_SRC_FIX (2<<9)
85	#define DWC_CTLL_DST_MSIZE(n) ((n)<<11) /* burst, #elements */
86	#define DWC_CTLL_SRC_MSIZE(n) ((n)<<14)
87	#define DWC_CTLL_S_GATH_EN (1 << 17) /* src gather, !FIX */
88	#define DWC_CTLL_D_SCAT_EN (1 << 18) /* dst scatter, !FIX */
89	#define DWC_CTLL_FC_M2M (0 << 20) /* mem-to-mem */
90	#define DWC_CTLL_FC_M2P (1 << 20) /* mem-to-periph */
91	#define DWC_CTLL_FC_P2M (2 << 20) /* periph-to-mem */
92	#define DWC_CTLL_FC_P2P (3 << 20) /* periph-to-periph */
93	/* plus 4 transfer types for peripheral-as-flow-controller */
94	#define DWC_CTLL_DMS(n) ((n)<<23) /* dst master select */
95	#define DWC_CTLL_SMS(n) ((n)<<25) /* src master select */
96	#define DWC_CTLL_LLP_D_EN (1 << 27) /* dest block chain */
97	#define DWC_CTLL_LLP_S_EN (1 << 28) /* src block chain */
98
99	/* Bitfields in CTL_HI */
100	#define DWC_CTLH_DONE 0x00001000
101	#define DWC_CTLH_BLOCK_TS_MASK 0x00000fff
102
103	/* Bitfields in CFG_LO. Platform-configurable bits are in <linux/dw_dmac.h> */
104	#define DWC_CFGL_CH_SUSP (1 << 8) /* pause xfer */
105	#define DWC_CFGL_FIFO_EMPTY (1 << 9) /* pause xfer */
106	#define DWC_CFGL_HS_DST (1 << 10) /* handshake w/dst */
107	#define DWC_CFGL_HS_SRC (1 << 11) /* handshake w/src */
108	#define DWC_CFGL_MAX_BURST(x) ((x) << 20)
109	#define DWC_CFGL_RELOAD_SAR (1 << 30)
110	#define DWC_CFGL_RELOAD_DAR (1 << 31)
111
112	/* Bitfields in CFG_HI. Platform-configurable bits are in <linux/dw_dmac.h> */
113	#define DWC_CFGH_DS_UPD_EN (1 << 5)
114	#define DWC_CFGH_SS_UPD_EN (1 << 6)
115
116	/* Bitfields in SGR */
117	#define DWC_SGR_SGI(x) ((x) << 0)
118	#define DWC_SGR_SGC(x) ((x) << 20)
119
120	/* Bitfields in DSR */
121	#define DWC_DSR_DSI(x) ((x) << 0)
122	#define DWC_DSR_DSC(x) ((x) << 20)
123
124	/* Bitfields in CFG */
125	#define DW_CFG_DMA_EN (1 << 0)
126
127	#define DW_REGLEN 0x400
128
d9de4519 HCE	129	enum dw_dmac_flags {
	130	DW_DMA_IS_CYCLIC = 0,
	131	};
	132
3bfb1d20 HS	133	struct dw_dma_chan {
	134	struct dma_chan chan;
	135	void __iomem *ch_regs;
	136	u8 mask;
	137
	138	spinlock_t lock;
	139
	140	/* these other elements are all protected by lock */
d9de4519	141	unsigned long flags;
3bfb1d20 HS	142	dma_cookie_t completed;
	143	struct list_head active_list;
	144	struct list_head queue;
	145	struct list_head free_list;
d9de4519	146	struct dw_cyclic_desc *cdesc;
3bfb1d20	147
3bfb1d20 HS	148	unsigned int descs_allocated;
	149	};
	150
	151	static inline struct dw_dma_chan_regs __iomem *
	152	__dwc_regs(struct dw_dma_chan *dwc)
	153	{
	154	return dwc->ch_regs;
	155	}
	156
	157	#define channel_readl(dwc, name) \
	158	__raw_readl(&(__dwc_regs(dwc)->name))
	159	#define channel_writel(dwc, name, val) \
	160	__raw_writel((val), &(__dwc_regs(dwc)->name))
	161
	162	static inline struct dw_dma_chan to_dw_dma_chan(struct dma_chan chan)
	163	{
	164	return container_of(chan, struct dw_dma_chan, chan);
	165	}
	166
3bfb1d20 HS	167	struct dw_dma {
	168	struct dma_device dma;
	169	void __iomem *regs;
	170	struct tasklet_struct tasklet;
	171	struct clk *clk;
	172
	173	u8 all_chan_mask;
	174
	175	struct dw_dma_chan chan[0];
	176	};
	177
	178	static inline struct dw_dma_regs __iomem __dw_regs(struct dw_dma dw)
	179	{
	180	return dw->regs;
	181	}
	182
	183	#define dma_readl(dw, name) \
	184	__raw_readl(&(__dw_regs(dw)->name))
	185	#define dma_writel(dw, name, val) \
	186	__raw_writel((val), &(__dw_regs(dw)->name))
	187
	188	#define channel_set_bit(dw, reg, mask) \
	189	dma_writel(dw, reg, ((mask) << 8) \| (mask))
	190	#define channel_clear_bit(dw, reg, mask) \
	191	dma_writel(dw, reg, ((mask) << 8) \| 0)
	192
	193	static inline struct dw_dma to_dw_dma(struct dma_device ddev)
	194	{
	195	return container_of(ddev, struct dw_dma, dma);
	196	}
	197
	198	/* LLI == Linked List Item; a.k.a. DMA block descriptor */
	199	struct dw_lli {
	200	/* values that are not changed by hardware */
	201	dma_addr_t sar;
	202	dma_addr_t dar;
	203	dma_addr_t llp; /* chain to next lli */
	204	u32 ctllo;
	205	/* values that may get written back: */
	206	u32 ctlhi;
	207	/* sstat and dstat can snapshot peripheral register state.
	208	* silicon config may discard either or both...
	209	*/
	210	u32 sstat;
	211	u32 dstat;
	212	};
	213
	214	struct dw_desc {
	215	/* FIRST values the hardware uses */
	216	struct dw_lli lli;
	217
	218	/* THEN values for driver housekeeping */
	219	struct list_head desc_node;
e0bd0f8c	220	struct list_head tx_list;
3bfb1d20 HS	221	struct dma_async_tx_descriptor txd;
	222	size_t len;
	223	};
	224
	225	static inline struct dw_desc *
	226	txd_to_dw_desc(struct dma_async_tx_descriptor *txd)
	227	{
	228	return container_of(txd, struct dw_desc, txd);
	229	}