drivers/dma/fsl-edma-common.h - linux/kernel/git/viro/vfs - Git at Google

 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Copyright 2013-2014 Freescale Semiconductor, Inc.
  * Copyright 2018 Angelo Dureghello <angelo@sysam.it>
  */
 #ifndef _FSL_EDMA_COMMON_H_
 #define _FSL_EDMA_COMMON_H_

 #include "virt-dma.h"

 #define EDMA_CR_EDBG		BIT(1)
 #define EDMA_CR_ERCA		BIT(2)
 #define EDMA_CR_ERGA		BIT(3)
 #define EDMA_CR_HOE		BIT(4)
 #define EDMA_CR_HALT		BIT(5)
 #define EDMA_CR_CLM		BIT(6)
 #define EDMA_CR_EMLM		BIT(7)
 #define EDMA_CR_ECX		BIT(16)
 #define EDMA_CR_CX		BIT(17)

 #define EDMA_SEEI_SEEI(x)	((x) & GENMASK(4, 0))
 #define EDMA_CEEI_CEEI(x)	((x) & GENMASK(4, 0))
 #define EDMA_CINT_CINT(x)	((x) & GENMASK(4, 0))
 #define EDMA_CERR_CERR(x)	((x) & GENMASK(4, 0))

 #define EDMA_TCD_ATTR_DSIZE(x)		(((x) & GENMASK(2, 0)))
 #define EDMA_TCD_ATTR_DMOD(x)		(((x) & GENMASK(4, 0)) << 3)
 #define EDMA_TCD_ATTR_SSIZE(x)		(((x) & GENMASK(2, 0)) << 8)
 #define EDMA_TCD_ATTR_SMOD(x)		(((x) & GENMASK(4, 0)) << 11)
 #define EDMA_TCD_ATTR_DSIZE_8BIT	0
 #define EDMA_TCD_ATTR_DSIZE_16BIT	BIT(0)
 #define EDMA_TCD_ATTR_DSIZE_32BIT	BIT(1)
 #define EDMA_TCD_ATTR_DSIZE_64BIT	(BIT(0) | BIT(1))
 #define EDMA_TCD_ATTR_DSIZE_32BYTE	(BIT(3) | BIT(0))
 #define EDMA_TCD_ATTR_SSIZE_8BIT	0
 #define EDMA_TCD_ATTR_SSIZE_16BIT	(EDMA_TCD_ATTR_DSIZE_16BIT << 8)
 #define EDMA_TCD_ATTR_SSIZE_32BIT	(EDMA_TCD_ATTR_DSIZE_32BIT << 8)
 #define EDMA_TCD_ATTR_SSIZE_64BIT	(EDMA_TCD_ATTR_DSIZE_64BIT << 8)
 #define EDMA_TCD_ATTR_SSIZE_32BYTE	(EDMA_TCD_ATTR_DSIZE_32BYTE << 8)

 #define EDMA_TCD_CITER_CITER(x)		((x) & GENMASK(14, 0))
 #define EDMA_TCD_BITER_BITER(x)		((x) & GENMASK(14, 0))

 #define EDMA_TCD_CSR_START		BIT(0)
 #define EDMA_TCD_CSR_INT_MAJOR		BIT(1)
 #define EDMA_TCD_CSR_INT_HALF		BIT(2)
 #define EDMA_TCD_CSR_D_REQ		BIT(3)
 #define EDMA_TCD_CSR_E_SG		BIT(4)
 #define EDMA_TCD_CSR_E_LINK		BIT(5)
 #define EDMA_TCD_CSR_ACTIVE		BIT(6)
 #define EDMA_TCD_CSR_DONE		BIT(7)

 #define EDMAMUX_CHCFG_DIS		0x0
 #define EDMAMUX_CHCFG_ENBL		0x80
 #define EDMAMUX_CHCFG_SOURCE(n)		((n) & 0x3F)

 #define DMAMUX_NR	2

 #define FSL_EDMA_BUSWIDTHS	(BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
 				 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
 				 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
 				 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
 enum fsl_edma_pm_state {
 	RUNNING = 0,
 	SUSPENDED,
 };

 struct fsl_edma_hw_tcd {
 	__le32	saddr;
 	__le16	soff;
 	__le16	attr;
 	__le32	nbytes;
 	__le32	slast;
 	__le32	daddr;
 	__le16	doff;
 	__le16	citer;
 	__le32	dlast_sga;
 	__le16	csr;
 	__le16	biter;
 };

 /*
  * These are iomem pointers, for both v32 and v64.
  */
 struct edma_regs {
 	void __iomem *cr;
 	void __iomem *es;
 	void __iomem *erqh;
 	void __iomem *erql;	/* aka erq on v32 */
 	void __iomem *eeih;
 	void __iomem *eeil;	/* aka eei on v32 */
 	void __iomem *seei;
 	void __iomem *ceei;
 	void __iomem *serq;
 	void __iomem *cerq;
 	void __iomem *cint;
 	void __iomem *cerr;
 	void __iomem *ssrt;
 	void __iomem *cdne;
 	void __iomem *inth;
 	void __iomem *intl;
 	void __iomem *errh;
 	void __iomem *errl;
 	struct fsl_edma_hw_tcd __iomem *tcd;
 };

 struct fsl_edma_sw_tcd {
 	dma_addr_t			ptcd;
 	struct fsl_edma_hw_tcd		*vtcd;
 };

 struct fsl_edma_chan {
 	struct virt_dma_chan		vchan;
 	enum dma_status			status;
 	enum fsl_edma_pm_state		pm_state;
 	bool				idle;
 	u32				slave_id;
 	struct fsl_edma_engine		*edma;
 	struct fsl_edma_desc		*edesc;
 	struct dma_slave_config		cfg;
 	u32				attr;
 	struct dma_pool			*tcd_pool;
 };

 struct fsl_edma_desc {
 	struct virt_dma_desc		vdesc;
 	struct fsl_edma_chan		*echan;
 	bool				iscyclic;
 	enum dma_transfer_direction	dirn;
 	unsigned int			n_tcds;
 	struct fsl_edma_sw_tcd		tcd[];
 };

 enum edma_version {
 	v1, /* 32ch, Vybdir, mpc57x, etc */
 	v2, /* 64ch Coldfire */
 };

 struct fsl_edma_engine {
 	struct dma_device	dma_dev;
 	void __iomem		*membase;
 	void __iomem		*muxbase[DMAMUX_NR];
 	struct clk		*muxclk[DMAMUX_NR];
 	struct mutex		fsl_edma_mutex;
 	u32			n_chans;
 	int			txirq;
 	int			errirq;
 	bool			big_endian;
 	enum edma_version	version;
 	struct edma_regs	regs;
 	struct fsl_edma_chan	chans[];
 };

 /*
  * R/W functions for big- or little-endian registers:
  * The eDMA controller's endian is independent of the CPU core's endian.
  * For the big-endian IP module, the offset for 8-bit or 16-bit registers
  * should also be swapped opposite to that in little-endian IP.
  */
 static inline u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)
 {
 	if (edma->big_endian)
 		return ioread32be(addr);
 	else
 		return ioread32(addr);
 }

 static inline void edma_writeb(struct fsl_edma_engine *edma,
 			       u8 val, void __iomem *addr)
 {
 	/* swap the reg offset for these in big-endian mode */
 	if (edma->big_endian)
 		iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3));
 	else
 		iowrite8(val, addr);
 }

 static inline void edma_writew(struct fsl_edma_engine *edma,
 			       u16 val, void __iomem *addr)
 {
 	/* swap the reg offset for these in big-endian mode */
 	if (edma->big_endian)
 		iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2));
 	else
 		iowrite16(val, addr);
 }

 static inline void edma_writel(struct fsl_edma_engine *edma,
 			       u32 val, void __iomem *addr)
 {
 	if (edma->big_endian)
 		iowrite32be(val, addr);
 	else
 		iowrite32(val, addr);
 }

 static inline struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan)
 {
 	return container_of(chan, struct fsl_edma_chan, vchan.chan);
 }

 static inline struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd)
 {
 	return container_of(vd, struct fsl_edma_desc, vdesc);
 }

 void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan);
 void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
 			unsigned int slot, bool enable);
 void fsl_edma_free_desc(struct virt_dma_desc *vdesc);
 int fsl_edma_terminate_all(struct dma_chan *chan);
 int fsl_edma_pause(struct dma_chan *chan);
 int fsl_edma_resume(struct dma_chan *chan);
 int fsl_edma_slave_config(struct dma_chan *chan,
 				 struct dma_slave_config *cfg);
 enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
 		dma_cookie_t cookie, struct dma_tx_state *txstate);
 struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
 		struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
 		size_t period_len, enum dma_transfer_direction direction,
 		unsigned long flags);
 struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
 		struct dma_chan *chan, struct scatterlist *sgl,
 		unsigned int sg_len, enum dma_transfer_direction direction,
 		unsigned long flags, void *context);
 void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan);
 void fsl_edma_issue_pending(struct dma_chan *chan);
 int fsl_edma_alloc_chan_resources(struct dma_chan *chan);
 void fsl_edma_free_chan_resources(struct dma_chan *chan);
 void fsl_edma_cleanup_vchan(struct dma_device *dmadev);
 void fsl_edma_setup_regs(struct fsl_edma_engine *edma);

 #endif /* _FSL_EDMA_COMMON_H_ */
	/* SPDX-License-Identifier: GPL-2.0+ */
	/*
	* Copyright 2013-2014 Freescale Semiconductor, Inc.
	* Copyright 2018 Angelo Dureghello <angelo@sysam.it>
	*/
	#ifndef _FSL_EDMA_COMMON_H_
	#define _FSL_EDMA_COMMON_H_

	#include "virt-dma.h"

	#define EDMA_CR_EDBG BIT(1)
	#define EDMA_CR_ERCA BIT(2)
	#define EDMA_CR_ERGA BIT(3)
	#define EDMA_CR_HOE BIT(4)
	#define EDMA_CR_HALT BIT(5)
	#define EDMA_CR_CLM BIT(6)
	#define EDMA_CR_EMLM BIT(7)
	#define EDMA_CR_ECX BIT(16)
	#define EDMA_CR_CX BIT(17)

	#define EDMA_SEEI_SEEI(x) ((x) & GENMASK(4, 0))
	#define EDMA_CEEI_CEEI(x) ((x) & GENMASK(4, 0))
	#define EDMA_CINT_CINT(x) ((x) & GENMASK(4, 0))
	#define EDMA_CERR_CERR(x) ((x) & GENMASK(4, 0))

	#define EDMA_TCD_ATTR_DSIZE(x) (((x) & GENMASK(2, 0)))
	#define EDMA_TCD_ATTR_DMOD(x) (((x) & GENMASK(4, 0)) << 3)
	#define EDMA_TCD_ATTR_SSIZE(x) (((x) & GENMASK(2, 0)) << 8)
	#define EDMA_TCD_ATTR_SMOD(x) (((x) & GENMASK(4, 0)) << 11)
	#define EDMA_TCD_ATTR_DSIZE_8BIT 0
	#define EDMA_TCD_ATTR_DSIZE_16BIT BIT(0)
	#define EDMA_TCD_ATTR_DSIZE_32BIT BIT(1)
	#define EDMA_TCD_ATTR_DSIZE_64BIT (BIT(0) \| BIT(1))
	#define EDMA_TCD_ATTR_DSIZE_32BYTE (BIT(3) \| BIT(0))
	#define EDMA_TCD_ATTR_SSIZE_8BIT 0
	#define EDMA_TCD_ATTR_SSIZE_16BIT (EDMA_TCD_ATTR_DSIZE_16BIT << 8)
	#define EDMA_TCD_ATTR_SSIZE_32BIT (EDMA_TCD_ATTR_DSIZE_32BIT << 8)
	#define EDMA_TCD_ATTR_SSIZE_64BIT (EDMA_TCD_ATTR_DSIZE_64BIT << 8)
	#define EDMA_TCD_ATTR_SSIZE_32BYTE (EDMA_TCD_ATTR_DSIZE_32BYTE << 8)

	#define EDMA_TCD_CITER_CITER(x) ((x) & GENMASK(14, 0))
	#define EDMA_TCD_BITER_BITER(x) ((x) & GENMASK(14, 0))

	#define EDMA_TCD_CSR_START BIT(0)
	#define EDMA_TCD_CSR_INT_MAJOR BIT(1)
	#define EDMA_TCD_CSR_INT_HALF BIT(2)
	#define EDMA_TCD_CSR_D_REQ BIT(3)
	#define EDMA_TCD_CSR_E_SG BIT(4)
	#define EDMA_TCD_CSR_E_LINK BIT(5)
	#define EDMA_TCD_CSR_ACTIVE BIT(6)
	#define EDMA_TCD_CSR_DONE BIT(7)

	#define EDMAMUX_CHCFG_DIS 0x0
	#define EDMAMUX_CHCFG_ENBL 0x80
	#define EDMAMUX_CHCFG_SOURCE(n) ((n) & 0x3F)

	#define DMAMUX_NR 2

	#define FSL_EDMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) \| \
	BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) \| \
	BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) \| \
	BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
	enum fsl_edma_pm_state {
	RUNNING = 0,
	SUSPENDED,
	};

	struct fsl_edma_hw_tcd {
	__le32 saddr;
	__le16 soff;
	__le16 attr;
	__le32 nbytes;
	__le32 slast;
	__le32 daddr;
	__le16 doff;
	__le16 citer;
	__le32 dlast_sga;
	__le16 csr;
	__le16 biter;
	};

	/*
	* These are iomem pointers, for both v32 and v64.
	*/
	struct edma_regs {
	void __iomem *cr;
	void __iomem *es;
	void __iomem *erqh;
	void __iomem erql; / aka erq on v32 */
	void __iomem *eeih;
	void __iomem eeil; / aka eei on v32 */
	void __iomem *seei;
	void __iomem *ceei;
	void __iomem *serq;
	void __iomem *cerq;
	void __iomem *cint;
	void __iomem *cerr;
	void __iomem *ssrt;
	void __iomem *cdne;
	void __iomem *inth;
	void __iomem *intl;
	void __iomem *errh;
	void __iomem *errl;
	struct fsl_edma_hw_tcd __iomem *tcd;
	};

	struct fsl_edma_sw_tcd {
	dma_addr_t ptcd;
	struct fsl_edma_hw_tcd *vtcd;
	};

	struct fsl_edma_chan {
	struct virt_dma_chan vchan;
	enum dma_status status;
	enum fsl_edma_pm_state pm_state;
	bool idle;
	u32 slave_id;
	struct fsl_edma_engine *edma;
	struct fsl_edma_desc *edesc;
	struct dma_slave_config cfg;
	u32 attr;
	struct dma_pool *tcd_pool;
	};

	struct fsl_edma_desc {
	struct virt_dma_desc vdesc;
	struct fsl_edma_chan *echan;
	bool iscyclic;
	enum dma_transfer_direction dirn;
	unsigned int n_tcds;
	struct fsl_edma_sw_tcd tcd[];
	};

	enum edma_version {
	v1, /* 32ch, Vybdir, mpc57x, etc */
	v2, /* 64ch Coldfire */
	};

	struct fsl_edma_engine {
	struct dma_device dma_dev;
	void __iomem *membase;
	void __iomem *muxbase[DMAMUX_NR];
	struct clk *muxclk[DMAMUX_NR];
	struct mutex fsl_edma_mutex;
	u32 n_chans;
	int txirq;
	int errirq;
	bool big_endian;
	enum edma_version version;
	struct edma_regs regs;
	struct fsl_edma_chan chans[];
	};

	/*
	* R/W functions for big- or little-endian registers:
	* The eDMA controller's endian is independent of the CPU core's endian.
	* For the big-endian IP module, the offset for 8-bit or 16-bit registers
	* should also be swapped opposite to that in little-endian IP.
	*/
	static inline u32 edma_readl(struct fsl_edma_engine edma, void __iomem addr)
	{
	if (edma->big_endian)
	return ioread32be(addr);
	else
	return ioread32(addr);
	}

	static inline void edma_writeb(struct fsl_edma_engine *edma,
	u8 val, void __iomem *addr)
	{
	/* swap the reg offset for these in big-endian mode */
	if (edma->big_endian)
	iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3));
	else
	iowrite8(val, addr);
	}

	static inline void edma_writew(struct fsl_edma_engine *edma,
	u16 val, void __iomem *addr)
	{
	/* swap the reg offset for these in big-endian mode */
	if (edma->big_endian)
	iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2));
	else
	iowrite16(val, addr);
	}

	static inline void edma_writel(struct fsl_edma_engine *edma,
	u32 val, void __iomem *addr)
	{
	if (edma->big_endian)
	iowrite32be(val, addr);
	else
	iowrite32(val, addr);
	}

	static inline struct fsl_edma_chan to_fsl_edma_chan(struct dma_chan chan)
	{
	return container_of(chan, struct fsl_edma_chan, vchan.chan);
	}

	static inline struct fsl_edma_desc to_fsl_edma_desc(struct virt_dma_desc vd)
	{
	return container_of(vd, struct fsl_edma_desc, vdesc);
	}

	void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan);
	void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
	unsigned int slot, bool enable);
	void fsl_edma_free_desc(struct virt_dma_desc *vdesc);
	int fsl_edma_terminate_all(struct dma_chan *chan);
	int fsl_edma_pause(struct dma_chan *chan);
	int fsl_edma_resume(struct dma_chan *chan);
	int fsl_edma_slave_config(struct dma_chan *chan,
	struct dma_slave_config *cfg);
	enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
	dma_cookie_t cookie, struct dma_tx_state *txstate);
	struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
	struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
	size_t period_len, enum dma_transfer_direction direction,
	unsigned long flags);
	struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
	struct dma_chan chan, struct scatterlist sgl,
	unsigned int sg_len, enum dma_transfer_direction direction,
	unsigned long flags, void *context);
	void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan);
	void fsl_edma_issue_pending(struct dma_chan *chan);
	int fsl_edma_alloc_chan_resources(struct dma_chan *chan);
	void fsl_edma_free_chan_resources(struct dma_chan *chan);
	void fsl_edma_cleanup_vchan(struct dma_device *dmadev);
	void fsl_edma_setup_regs(struct fsl_edma_engine *edma);

	#endif /* _FSL_EDMA_COMMON_H_ */