xref: /openbmc/linux/drivers/dma/fsl-edma-common.h (revision c91c8d38)
1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Copyright 2013-2014 Freescale Semiconductor, Inc.
4  * Copyright 2018 Angelo Dureghello <angelo@sysam.it>
5  */
6 #ifndef _FSL_EDMA_COMMON_H_
7 #define _FSL_EDMA_COMMON_H_
8 
9 #include <linux/dma-direction.h>
10 #include <linux/platform_device.h>
11 #include "virt-dma.h"
12 
13 #define EDMA_CR_EDBG		BIT(1)
14 #define EDMA_CR_ERCA		BIT(2)
15 #define EDMA_CR_ERGA		BIT(3)
16 #define EDMA_CR_HOE		BIT(4)
17 #define EDMA_CR_HALT		BIT(5)
18 #define EDMA_CR_CLM		BIT(6)
19 #define EDMA_CR_EMLM		BIT(7)
20 #define EDMA_CR_ECX		BIT(16)
21 #define EDMA_CR_CX		BIT(17)
22 
23 #define EDMA_SEEI_SEEI(x)	((x) & GENMASK(4, 0))
24 #define EDMA_CEEI_CEEI(x)	((x) & GENMASK(4, 0))
25 #define EDMA_CINT_CINT(x)	((x) & GENMASK(4, 0))
26 #define EDMA_CERR_CERR(x)	((x) & GENMASK(4, 0))
27 
28 #define EDMA_TCD_ATTR_DSIZE(x)		(((x) & GENMASK(2, 0)))
29 #define EDMA_TCD_ATTR_DMOD(x)		(((x) & GENMASK(4, 0)) << 3)
30 #define EDMA_TCD_ATTR_SSIZE(x)		(((x) & GENMASK(2, 0)) << 8)
31 #define EDMA_TCD_ATTR_SMOD(x)		(((x) & GENMASK(4, 0)) << 11)
32 
33 #define EDMA_TCD_ITER_MASK		GENMASK(14, 0)
34 #define EDMA_TCD_CITER_CITER(x)		((x) & EDMA_TCD_ITER_MASK)
35 #define EDMA_TCD_BITER_BITER(x)		((x) & EDMA_TCD_ITER_MASK)
36 
37 #define EDMA_TCD_CSR_START		BIT(0)
38 #define EDMA_TCD_CSR_INT_MAJOR		BIT(1)
39 #define EDMA_TCD_CSR_INT_HALF		BIT(2)
40 #define EDMA_TCD_CSR_D_REQ		BIT(3)
41 #define EDMA_TCD_CSR_E_SG		BIT(4)
42 #define EDMA_TCD_CSR_E_LINK		BIT(5)
43 #define EDMA_TCD_CSR_ACTIVE		BIT(6)
44 #define EDMA_TCD_CSR_DONE		BIT(7)
45 
46 #define EDMA_V3_TCD_NBYTES_MLOFF_NBYTES(x) ((x) & GENMASK(9, 0))
47 #define EDMA_V3_TCD_NBYTES_MLOFF(x)        (x << 10)
48 #define EDMA_V3_TCD_NBYTES_DMLOE           (1 << 30)
49 #define EDMA_V3_TCD_NBYTES_SMLOE           (1 << 31)
50 
51 #define EDMAMUX_CHCFG_DIS		0x0
52 #define EDMAMUX_CHCFG_ENBL		0x80
53 #define EDMAMUX_CHCFG_SOURCE(n)		((n) & 0x3F)
54 
55 #define DMAMUX_NR	2
56 
57 #define EDMA_TCD                0x1000
58 
59 #define FSL_EDMA_BUSWIDTHS	(BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
60 				 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
61 				 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
62 				 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
63 
64 #define EDMA_V3_CH_SBR_RD          BIT(22)
65 #define EDMA_V3_CH_SBR_WR          BIT(21)
66 #define EDMA_V3_CH_CSR_ERQ         BIT(0)
67 #define EDMA_V3_CH_CSR_EARQ        BIT(1)
68 #define EDMA_V3_CH_CSR_EEI         BIT(2)
69 #define EDMA_V3_CH_CSR_DONE        BIT(30)
70 #define EDMA_V3_CH_CSR_ACTIVE      BIT(31)
71 
72 enum fsl_edma_pm_state {
73 	RUNNING = 0,
74 	SUSPENDED,
75 };
76 
77 struct fsl_edma_hw_tcd {
78 	__le32	saddr;
79 	__le16	soff;
80 	__le16	attr;
81 	__le32	nbytes;
82 	__le32	slast;
83 	__le32	daddr;
84 	__le16	doff;
85 	__le16	citer;
86 	__le32	dlast_sga;
87 	__le16	csr;
88 	__le16	biter;
89 };
90 
91 struct fsl_edma3_ch_reg {
92 	__le32	ch_csr;
93 	__le32	ch_es;
94 	__le32	ch_int;
95 	__le32	ch_sbr;
96 	__le32	ch_pri;
97 	__le32	ch_mux;
98 	__le32  ch_mattr; /* edma4, reserved for edma3 */
99 	__le32  ch_reserved;
100 	struct fsl_edma_hw_tcd tcd;
101 } __packed;
102 
103 /*
104  * These are iomem pointers, for both v32 and v64.
105  */
106 struct edma_regs {
107 	void __iomem *cr;
108 	void __iomem *es;
109 	void __iomem *erqh;
110 	void __iomem *erql;	/* aka erq on v32 */
111 	void __iomem *eeih;
112 	void __iomem *eeil;	/* aka eei on v32 */
113 	void __iomem *seei;
114 	void __iomem *ceei;
115 	void __iomem *serq;
116 	void __iomem *cerq;
117 	void __iomem *cint;
118 	void __iomem *cerr;
119 	void __iomem *ssrt;
120 	void __iomem *cdne;
121 	void __iomem *inth;
122 	void __iomem *intl;
123 	void __iomem *errh;
124 	void __iomem *errl;
125 };
126 
127 struct fsl_edma_sw_tcd {
128 	dma_addr_t			ptcd;
129 	struct fsl_edma_hw_tcd		*vtcd;
130 };
131 
132 struct fsl_edma_chan {
133 	struct virt_dma_chan		vchan;
134 	enum dma_status			status;
135 	enum fsl_edma_pm_state		pm_state;
136 	bool				idle;
137 	u32				slave_id;
138 	struct fsl_edma_engine		*edma;
139 	struct fsl_edma_desc		*edesc;
140 	struct dma_slave_config		cfg;
141 	u32				attr;
142 	bool                            is_sw;
143 	struct dma_pool			*tcd_pool;
144 	dma_addr_t			dma_dev_addr;
145 	u32				dma_dev_size;
146 	enum dma_data_direction		dma_dir;
147 	char				chan_name[32];
148 	struct fsl_edma_hw_tcd __iomem *tcd;
149 	void __iomem			*mux_addr;
150 	u32				real_count;
151 	struct work_struct		issue_worker;
152 	struct platform_device		*pdev;
153 	struct device			*pd_dev;
154 	u32				srcid;
155 	struct clk			*clk;
156 	int                             priority;
157 	int				hw_chanid;
158 	int				txirq;
159 	bool				is_rxchan;
160 	bool				is_remote;
161 	bool				is_multi_fifo;
162 };
163 
164 struct fsl_edma_desc {
165 	struct virt_dma_desc		vdesc;
166 	struct fsl_edma_chan		*echan;
167 	bool				iscyclic;
168 	enum dma_transfer_direction	dirn;
169 	unsigned int			n_tcds;
170 	struct fsl_edma_sw_tcd		tcd[];
171 };
172 
173 #define FSL_EDMA_DRV_HAS_DMACLK		BIT(0)
174 #define FSL_EDMA_DRV_MUX_SWAP		BIT(1)
175 #define FSL_EDMA_DRV_CONFIG32		BIT(2)
176 #define FSL_EDMA_DRV_WRAP_IO		BIT(3)
177 #define FSL_EDMA_DRV_EDMA64		BIT(4)
178 #define FSL_EDMA_DRV_HAS_PD		BIT(5)
179 #define FSL_EDMA_DRV_HAS_CHCLK		BIT(6)
180 #define FSL_EDMA_DRV_HAS_CHMUX		BIT(7)
181 #define FSL_EDMA_DRV_MEM_REMOTE		BIT(8)
182 /* control and status register is in tcd address space, edma3 reg layout */
183 #define FSL_EDMA_DRV_SPLIT_REG		BIT(9)
184 #define FSL_EDMA_DRV_BUS_8BYTE		BIT(10)
185 #define FSL_EDMA_DRV_DEV_TO_DEV		BIT(11)
186 #define FSL_EDMA_DRV_ALIGN_64BYTE	BIT(12)
187 /* Need clean CHn_CSR DONE before enable TCD's ESG */
188 #define FSL_EDMA_DRV_CLEAR_DONE_E_SG	BIT(13)
189 /* Need clean CHn_CSR DONE before enable TCD's MAJORELINK */
190 #define FSL_EDMA_DRV_CLEAR_DONE_E_LINK	BIT(14)
191 
192 #define FSL_EDMA_DRV_EDMA3	(FSL_EDMA_DRV_SPLIT_REG |	\
193 				 FSL_EDMA_DRV_BUS_8BYTE |	\
194 				 FSL_EDMA_DRV_DEV_TO_DEV |	\
195 				 FSL_EDMA_DRV_ALIGN_64BYTE |	\
196 				 FSL_EDMA_DRV_CLEAR_DONE_E_SG |	\
197 				 FSL_EDMA_DRV_CLEAR_DONE_E_LINK)
198 
199 #define FSL_EDMA_DRV_EDMA4	(FSL_EDMA_DRV_SPLIT_REG |	\
200 				 FSL_EDMA_DRV_BUS_8BYTE |	\
201 				 FSL_EDMA_DRV_DEV_TO_DEV |	\
202 				 FSL_EDMA_DRV_ALIGN_64BYTE |	\
203 				 FSL_EDMA_DRV_CLEAR_DONE_E_LINK)
204 
205 struct fsl_edma_drvdata {
206 	u32			dmamuxs; /* only used before v3 */
207 	u32			chreg_off;
208 	u32			chreg_space_sz;
209 	u32			flags;
210 	u32			mux_off;	/* channel mux register offset */
211 	u32			mux_skip;	/* how much skip for each channel */
212 	int			(*setup_irq)(struct platform_device *pdev,
213 					     struct fsl_edma_engine *fsl_edma);
214 };
215 
216 struct fsl_edma_engine {
217 	struct dma_device	dma_dev;
218 	void __iomem		*membase;
219 	void __iomem		*muxbase[DMAMUX_NR];
220 	struct clk		*muxclk[DMAMUX_NR];
221 	struct clk		*dmaclk;
222 	struct clk		*chclk;
223 	struct mutex		fsl_edma_mutex;
224 	const struct fsl_edma_drvdata *drvdata;
225 	u32			n_chans;
226 	int			txirq;
227 	int			errirq;
228 	bool			big_endian;
229 	struct edma_regs	regs;
230 	u64			chan_masked;
231 	struct fsl_edma_chan	chans[];
232 };
233 
234 #define edma_read_tcdreg(chan, __name)				\
235 (sizeof(chan->tcd->__name) == sizeof(u32) ?			\
236 	edma_readl(chan->edma, &chan->tcd->__name) :		\
237 	edma_readw(chan->edma, &chan->tcd->__name))
238 
239 #define edma_write_tcdreg(chan, val, __name)			\
240 (sizeof(chan->tcd->__name) == sizeof(u32) ?			\
241 	edma_writel(chan->edma, (u32 __force)val, &chan->tcd->__name) :	\
242 	edma_writew(chan->edma, (u16 __force)val, &chan->tcd->__name))
243 
244 #define edma_readl_chreg(chan, __name)				\
245 	edma_readl(chan->edma,					\
246 		   (void __iomem *)&(container_of(chan->tcd, struct fsl_edma3_ch_reg, tcd)->__name))
247 
248 #define edma_writel_chreg(chan, val,  __name)			\
249 	edma_writel(chan->edma, val,				\
250 		   (void __iomem *)&(container_of(chan->tcd, struct fsl_edma3_ch_reg, tcd)->__name))
251 
252 /*
253  * R/W functions for big- or little-endian registers:
254  * The eDMA controller's endian is independent of the CPU core's endian.
255  * For the big-endian IP module, the offset for 8-bit or 16-bit registers
256  * should also be swapped opposite to that in little-endian IP.
257  */
edma_readl(struct fsl_edma_engine * edma,void __iomem * addr)258 static inline u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)
259 {
260 	if (edma->big_endian)
261 		return ioread32be(addr);
262 	else
263 		return ioread32(addr);
264 }
265 
edma_readw(struct fsl_edma_engine * edma,void __iomem * addr)266 static inline u16 edma_readw(struct fsl_edma_engine *edma, void __iomem *addr)
267 {
268 	if (edma->big_endian)
269 		return ioread16be(addr);
270 	else
271 		return ioread16(addr);
272 }
273 
edma_writeb(struct fsl_edma_engine * edma,u8 val,void __iomem * addr)274 static inline void edma_writeb(struct fsl_edma_engine *edma,
275 			       u8 val, void __iomem *addr)
276 {
277 	/* swap the reg offset for these in big-endian mode */
278 	if (edma->big_endian)
279 		iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3));
280 	else
281 		iowrite8(val, addr);
282 }
283 
edma_writew(struct fsl_edma_engine * edma,u16 val,void __iomem * addr)284 static inline void edma_writew(struct fsl_edma_engine *edma,
285 			       u16 val, void __iomem *addr)
286 {
287 	/* swap the reg offset for these in big-endian mode */
288 	if (edma->big_endian)
289 		iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2));
290 	else
291 		iowrite16(val, addr);
292 }
293 
edma_writel(struct fsl_edma_engine * edma,u32 val,void __iomem * addr)294 static inline void edma_writel(struct fsl_edma_engine *edma,
295 			       u32 val, void __iomem *addr)
296 {
297 	if (edma->big_endian)
298 		iowrite32be(val, addr);
299 	else
300 		iowrite32(val, addr);
301 }
302 
to_fsl_edma_chan(struct dma_chan * chan)303 static inline struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan)
304 {
305 	return container_of(chan, struct fsl_edma_chan, vchan.chan);
306 }
307 
fsl_edma_drvflags(struct fsl_edma_chan * fsl_chan)308 static inline u32 fsl_edma_drvflags(struct fsl_edma_chan *fsl_chan)
309 {
310 	return fsl_chan->edma->drvdata->flags;
311 }
312 
to_fsl_edma_desc(struct virt_dma_desc * vd)313 static inline struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd)
314 {
315 	return container_of(vd, struct fsl_edma_desc, vdesc);
316 }
317 
fsl_edma_err_chan_handler(struct fsl_edma_chan * fsl_chan)318 static inline void fsl_edma_err_chan_handler(struct fsl_edma_chan *fsl_chan)
319 {
320 	fsl_chan->status = DMA_ERROR;
321 	fsl_chan->idle = true;
322 }
323 
324 void fsl_edma_tx_chan_handler(struct fsl_edma_chan *fsl_chan);
325 void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan);
326 void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
327 			unsigned int slot, bool enable);
328 void fsl_edma_free_desc(struct virt_dma_desc *vdesc);
329 int fsl_edma_terminate_all(struct dma_chan *chan);
330 int fsl_edma_pause(struct dma_chan *chan);
331 int fsl_edma_resume(struct dma_chan *chan);
332 int fsl_edma_slave_config(struct dma_chan *chan,
333 				 struct dma_slave_config *cfg);
334 enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
335 		dma_cookie_t cookie, struct dma_tx_state *txstate);
336 struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
337 		struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
338 		size_t period_len, enum dma_transfer_direction direction,
339 		unsigned long flags);
340 struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
341 		struct dma_chan *chan, struct scatterlist *sgl,
342 		unsigned int sg_len, enum dma_transfer_direction direction,
343 		unsigned long flags, void *context);
344 struct dma_async_tx_descriptor *fsl_edma_prep_memcpy(
345 		struct dma_chan *chan, dma_addr_t dma_dst, dma_addr_t dma_src,
346 		size_t len, unsigned long flags);
347 void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan);
348 void fsl_edma_issue_pending(struct dma_chan *chan);
349 int fsl_edma_alloc_chan_resources(struct dma_chan *chan);
350 void fsl_edma_free_chan_resources(struct dma_chan *chan);
351 void fsl_edma_cleanup_vchan(struct dma_device *dmadev);
352 void fsl_edma_setup_regs(struct fsl_edma_engine *edma);
353 
354 #endif /* _FSL_EDMA_COMMON_H_ */
355