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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a4ffb13c PYM |
2 | /* |
3 | * | |
4 | * Copyright (C) STMicroelectronics SA 2017 | |
5 | * Author(s): M'boumba Cedric Madianga <cedric.madianga@gmail.com> | |
6 | * Pierre-Yves Mordret <pierre-yves.mordret@st.com> | |
7 | * | |
a4ffb13c PYM |
8 | * Driver for STM32 MDMA controller |
9 | * | |
10 | * Inspired by stm32-dma.c and dma-jz4780.c | |
a4ffb13c PYM |
11 | */ |
12 | ||
13 | #include <linux/clk.h> | |
14 | #include <linux/delay.h> | |
15 | #include <linux/dmaengine.h> | |
16 | #include <linux/dma-mapping.h> | |
17 | #include <linux/dmapool.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/iopoll.h> | |
21 | #include <linux/jiffies.h> | |
22 | #include <linux/list.h> | |
23 | #include <linux/log2.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/of.h> | |
26 | #include <linux/of_device.h> | |
27 | #include <linux/of_dma.h> | |
28 | #include <linux/platform_device.h> | |
89e987e3 | 29 | #include <linux/pm_runtime.h> |
a4ffb13c PYM |
30 | #include <linux/reset.h> |
31 | #include <linux/slab.h> | |
32 | ||
33 | #include "virt-dma.h" | |
34 | ||
35 | /* MDMA Generic getter/setter */ | |
36 | #define STM32_MDMA_SHIFT(n) (ffs(n) - 1) | |
37 | #define STM32_MDMA_SET(n, mask) (((n) << STM32_MDMA_SHIFT(mask)) & \ | |
38 | (mask)) | |
39 | #define STM32_MDMA_GET(n, mask) (((n) & (mask)) >> \ | |
40 | STM32_MDMA_SHIFT(mask)) | |
41 | ||
42 | #define STM32_MDMA_GISR0 0x0000 /* MDMA Int Status Reg 1 */ | |
43 | #define STM32_MDMA_GISR1 0x0004 /* MDMA Int Status Reg 2 */ | |
44 | ||
45 | /* MDMA Channel x interrupt/status register */ | |
46 | #define STM32_MDMA_CISR(x) (0x40 + 0x40 * (x)) /* x = 0..62 */ | |
47 | #define STM32_MDMA_CISR_CRQA BIT(16) | |
48 | #define STM32_MDMA_CISR_TCIF BIT(4) | |
49 | #define STM32_MDMA_CISR_BTIF BIT(3) | |
50 | #define STM32_MDMA_CISR_BRTIF BIT(2) | |
51 | #define STM32_MDMA_CISR_CTCIF BIT(1) | |
52 | #define STM32_MDMA_CISR_TEIF BIT(0) | |
53 | ||
54 | /* MDMA Channel x interrupt flag clear register */ | |
55 | #define STM32_MDMA_CIFCR(x) (0x44 + 0x40 * (x)) | |
56 | #define STM32_MDMA_CIFCR_CLTCIF BIT(4) | |
57 | #define STM32_MDMA_CIFCR_CBTIF BIT(3) | |
58 | #define STM32_MDMA_CIFCR_CBRTIF BIT(2) | |
59 | #define STM32_MDMA_CIFCR_CCTCIF BIT(1) | |
60 | #define STM32_MDMA_CIFCR_CTEIF BIT(0) | |
61 | #define STM32_MDMA_CIFCR_CLEAR_ALL (STM32_MDMA_CIFCR_CLTCIF \ | |
62 | | STM32_MDMA_CIFCR_CBTIF \ | |
63 | | STM32_MDMA_CIFCR_CBRTIF \ | |
64 | | STM32_MDMA_CIFCR_CCTCIF \ | |
65 | | STM32_MDMA_CIFCR_CTEIF) | |
66 | ||
67 | /* MDMA Channel x error status register */ | |
68 | #define STM32_MDMA_CESR(x) (0x48 + 0x40 * (x)) | |
69 | #define STM32_MDMA_CESR_BSE BIT(11) | |
70 | #define STM32_MDMA_CESR_ASR BIT(10) | |
71 | #define STM32_MDMA_CESR_TEMD BIT(9) | |
72 | #define STM32_MDMA_CESR_TELD BIT(8) | |
73 | #define STM32_MDMA_CESR_TED BIT(7) | |
74 | #define STM32_MDMA_CESR_TEA_MASK GENMASK(6, 0) | |
75 | ||
76 | /* MDMA Channel x control register */ | |
77 | #define STM32_MDMA_CCR(x) (0x4C + 0x40 * (x)) | |
78 | #define STM32_MDMA_CCR_SWRQ BIT(16) | |
79 | #define STM32_MDMA_CCR_WEX BIT(14) | |
80 | #define STM32_MDMA_CCR_HEX BIT(13) | |
81 | #define STM32_MDMA_CCR_BEX BIT(12) | |
82 | #define STM32_MDMA_CCR_PL_MASK GENMASK(7, 6) | |
83 | #define STM32_MDMA_CCR_PL(n) STM32_MDMA_SET(n, \ | |
84 | STM32_MDMA_CCR_PL_MASK) | |
85 | #define STM32_MDMA_CCR_TCIE BIT(5) | |
86 | #define STM32_MDMA_CCR_BTIE BIT(4) | |
87 | #define STM32_MDMA_CCR_BRTIE BIT(3) | |
88 | #define STM32_MDMA_CCR_CTCIE BIT(2) | |
89 | #define STM32_MDMA_CCR_TEIE BIT(1) | |
90 | #define STM32_MDMA_CCR_EN BIT(0) | |
91 | #define STM32_MDMA_CCR_IRQ_MASK (STM32_MDMA_CCR_TCIE \ | |
92 | | STM32_MDMA_CCR_BTIE \ | |
93 | | STM32_MDMA_CCR_BRTIE \ | |
94 | | STM32_MDMA_CCR_CTCIE \ | |
95 | | STM32_MDMA_CCR_TEIE) | |
96 | ||
97 | /* MDMA Channel x transfer configuration register */ | |
98 | #define STM32_MDMA_CTCR(x) (0x50 + 0x40 * (x)) | |
99 | #define STM32_MDMA_CTCR_BWM BIT(31) | |
100 | #define STM32_MDMA_CTCR_SWRM BIT(30) | |
101 | #define STM32_MDMA_CTCR_TRGM_MSK GENMASK(29, 28) | |
102 | #define STM32_MDMA_CTCR_TRGM(n) STM32_MDMA_SET((n), \ | |
103 | STM32_MDMA_CTCR_TRGM_MSK) | |
104 | #define STM32_MDMA_CTCR_TRGM_GET(n) STM32_MDMA_GET((n), \ | |
105 | STM32_MDMA_CTCR_TRGM_MSK) | |
106 | #define STM32_MDMA_CTCR_PAM_MASK GENMASK(27, 26) | |
107 | #define STM32_MDMA_CTCR_PAM(n) STM32_MDMA_SET(n, \ | |
108 | STM32_MDMA_CTCR_PAM_MASK) | |
109 | #define STM32_MDMA_CTCR_PKE BIT(25) | |
110 | #define STM32_MDMA_CTCR_TLEN_MSK GENMASK(24, 18) | |
111 | #define STM32_MDMA_CTCR_TLEN(n) STM32_MDMA_SET((n), \ | |
112 | STM32_MDMA_CTCR_TLEN_MSK) | |
113 | #define STM32_MDMA_CTCR_TLEN_GET(n) STM32_MDMA_GET((n), \ | |
114 | STM32_MDMA_CTCR_TLEN_MSK) | |
115 | #define STM32_MDMA_CTCR_LEN2_MSK GENMASK(25, 18) | |
116 | #define STM32_MDMA_CTCR_LEN2(n) STM32_MDMA_SET((n), \ | |
117 | STM32_MDMA_CTCR_LEN2_MSK) | |
118 | #define STM32_MDMA_CTCR_LEN2_GET(n) STM32_MDMA_GET((n), \ | |
119 | STM32_MDMA_CTCR_LEN2_MSK) | |
120 | #define STM32_MDMA_CTCR_DBURST_MASK GENMASK(17, 15) | |
121 | #define STM32_MDMA_CTCR_DBURST(n) STM32_MDMA_SET(n, \ | |
122 | STM32_MDMA_CTCR_DBURST_MASK) | |
123 | #define STM32_MDMA_CTCR_SBURST_MASK GENMASK(14, 12) | |
124 | #define STM32_MDMA_CTCR_SBURST(n) STM32_MDMA_SET(n, \ | |
125 | STM32_MDMA_CTCR_SBURST_MASK) | |
126 | #define STM32_MDMA_CTCR_DINCOS_MASK GENMASK(11, 10) | |
127 | #define STM32_MDMA_CTCR_DINCOS(n) STM32_MDMA_SET((n), \ | |
128 | STM32_MDMA_CTCR_DINCOS_MASK) | |
129 | #define STM32_MDMA_CTCR_SINCOS_MASK GENMASK(9, 8) | |
130 | #define STM32_MDMA_CTCR_SINCOS(n) STM32_MDMA_SET((n), \ | |
131 | STM32_MDMA_CTCR_SINCOS_MASK) | |
132 | #define STM32_MDMA_CTCR_DSIZE_MASK GENMASK(7, 6) | |
133 | #define STM32_MDMA_CTCR_DSIZE(n) STM32_MDMA_SET(n, \ | |
134 | STM32_MDMA_CTCR_DSIZE_MASK) | |
135 | #define STM32_MDMA_CTCR_SSIZE_MASK GENMASK(5, 4) | |
136 | #define STM32_MDMA_CTCR_SSIZE(n) STM32_MDMA_SET(n, \ | |
137 | STM32_MDMA_CTCR_SSIZE_MASK) | |
138 | #define STM32_MDMA_CTCR_DINC_MASK GENMASK(3, 2) | |
139 | #define STM32_MDMA_CTCR_DINC(n) STM32_MDMA_SET((n), \ | |
140 | STM32_MDMA_CTCR_DINC_MASK) | |
141 | #define STM32_MDMA_CTCR_SINC_MASK GENMASK(1, 0) | |
142 | #define STM32_MDMA_CTCR_SINC(n) STM32_MDMA_SET((n), \ | |
143 | STM32_MDMA_CTCR_SINC_MASK) | |
144 | #define STM32_MDMA_CTCR_CFG_MASK (STM32_MDMA_CTCR_SINC_MASK \ | |
145 | | STM32_MDMA_CTCR_DINC_MASK \ | |
146 | | STM32_MDMA_CTCR_SINCOS_MASK \ | |
147 | | STM32_MDMA_CTCR_DINCOS_MASK \ | |
148 | | STM32_MDMA_CTCR_LEN2_MSK \ | |
149 | | STM32_MDMA_CTCR_TRGM_MSK) | |
150 | ||
151 | /* MDMA Channel x block number of data register */ | |
152 | #define STM32_MDMA_CBNDTR(x) (0x54 + 0x40 * (x)) | |
153 | #define STM32_MDMA_CBNDTR_BRC_MK GENMASK(31, 20) | |
154 | #define STM32_MDMA_CBNDTR_BRC(n) STM32_MDMA_SET(n, \ | |
155 | STM32_MDMA_CBNDTR_BRC_MK) | |
156 | #define STM32_MDMA_CBNDTR_BRC_GET(n) STM32_MDMA_GET((n), \ | |
157 | STM32_MDMA_CBNDTR_BRC_MK) | |
158 | ||
159 | #define STM32_MDMA_CBNDTR_BRDUM BIT(19) | |
160 | #define STM32_MDMA_CBNDTR_BRSUM BIT(18) | |
161 | #define STM32_MDMA_CBNDTR_BNDT_MASK GENMASK(16, 0) | |
162 | #define STM32_MDMA_CBNDTR_BNDT(n) STM32_MDMA_SET(n, \ | |
163 | STM32_MDMA_CBNDTR_BNDT_MASK) | |
164 | ||
165 | /* MDMA Channel x source address register */ | |
166 | #define STM32_MDMA_CSAR(x) (0x58 + 0x40 * (x)) | |
167 | ||
168 | /* MDMA Channel x destination address register */ | |
169 | #define STM32_MDMA_CDAR(x) (0x5C + 0x40 * (x)) | |
170 | ||
171 | /* MDMA Channel x block repeat address update register */ | |
172 | #define STM32_MDMA_CBRUR(x) (0x60 + 0x40 * (x)) | |
173 | #define STM32_MDMA_CBRUR_DUV_MASK GENMASK(31, 16) | |
174 | #define STM32_MDMA_CBRUR_DUV(n) STM32_MDMA_SET(n, \ | |
175 | STM32_MDMA_CBRUR_DUV_MASK) | |
176 | #define STM32_MDMA_CBRUR_SUV_MASK GENMASK(15, 0) | |
177 | #define STM32_MDMA_CBRUR_SUV(n) STM32_MDMA_SET(n, \ | |
178 | STM32_MDMA_CBRUR_SUV_MASK) | |
179 | ||
180 | /* MDMA Channel x link address register */ | |
181 | #define STM32_MDMA_CLAR(x) (0x64 + 0x40 * (x)) | |
182 | ||
183 | /* MDMA Channel x trigger and bus selection register */ | |
184 | #define STM32_MDMA_CTBR(x) (0x68 + 0x40 * (x)) | |
185 | #define STM32_MDMA_CTBR_DBUS BIT(17) | |
186 | #define STM32_MDMA_CTBR_SBUS BIT(16) | |
187 | #define STM32_MDMA_CTBR_TSEL_MASK GENMASK(7, 0) | |
188 | #define STM32_MDMA_CTBR_TSEL(n) STM32_MDMA_SET(n, \ | |
189 | STM32_MDMA_CTBR_TSEL_MASK) | |
190 | ||
191 | /* MDMA Channel x mask address register */ | |
192 | #define STM32_MDMA_CMAR(x) (0x70 + 0x40 * (x)) | |
193 | ||
194 | /* MDMA Channel x mask data register */ | |
195 | #define STM32_MDMA_CMDR(x) (0x74 + 0x40 * (x)) | |
196 | ||
197 | #define STM32_MDMA_MAX_BUF_LEN 128 | |
198 | #define STM32_MDMA_MAX_BLOCK_LEN 65536 | |
199 | #define STM32_MDMA_MAX_CHANNELS 63 | |
200 | #define STM32_MDMA_MAX_REQUESTS 256 | |
201 | #define STM32_MDMA_MAX_BURST 128 | |
202 | #define STM32_MDMA_VERY_HIGH_PRIORITY 0x11 | |
203 | ||
204 | enum stm32_mdma_trigger_mode { | |
205 | STM32_MDMA_BUFFER, | |
206 | STM32_MDMA_BLOCK, | |
207 | STM32_MDMA_BLOCK_REP, | |
208 | STM32_MDMA_LINKED_LIST, | |
209 | }; | |
210 | ||
211 | enum stm32_mdma_width { | |
212 | STM32_MDMA_BYTE, | |
213 | STM32_MDMA_HALF_WORD, | |
214 | STM32_MDMA_WORD, | |
215 | STM32_MDMA_DOUBLE_WORD, | |
216 | }; | |
217 | ||
218 | enum stm32_mdma_inc_mode { | |
219 | STM32_MDMA_FIXED = 0, | |
220 | STM32_MDMA_INC = 2, | |
221 | STM32_MDMA_DEC = 3, | |
222 | }; | |
223 | ||
224 | struct stm32_mdma_chan_config { | |
225 | u32 request; | |
226 | u32 priority_level; | |
227 | u32 transfer_config; | |
228 | u32 mask_addr; | |
229 | u32 mask_data; | |
230 | }; | |
231 | ||
232 | struct stm32_mdma_hwdesc { | |
233 | u32 ctcr; | |
234 | u32 cbndtr; | |
235 | u32 csar; | |
236 | u32 cdar; | |
237 | u32 cbrur; | |
238 | u32 clar; | |
239 | u32 ctbr; | |
240 | u32 dummy; | |
241 | u32 cmar; | |
242 | u32 cmdr; | |
243 | } __aligned(64); | |
244 | ||
bbb5a4e1 PYM |
245 | struct stm32_mdma_desc_node { |
246 | struct stm32_mdma_hwdesc *hwdesc; | |
247 | dma_addr_t hwdesc_phys; | |
248 | }; | |
249 | ||
a4ffb13c PYM |
250 | struct stm32_mdma_desc { |
251 | struct virt_dma_desc vdesc; | |
252 | u32 ccr; | |
a4ffb13c PYM |
253 | bool cyclic; |
254 | u32 count; | |
bbb5a4e1 | 255 | struct stm32_mdma_desc_node node[]; |
a4ffb13c PYM |
256 | }; |
257 | ||
258 | struct stm32_mdma_chan { | |
259 | struct virt_dma_chan vchan; | |
260 | struct dma_pool *desc_pool; | |
261 | u32 id; | |
262 | struct stm32_mdma_desc *desc; | |
263 | u32 curr_hwdesc; | |
264 | struct dma_slave_config dma_config; | |
265 | struct stm32_mdma_chan_config chan_config; | |
266 | bool busy; | |
267 | u32 mem_burst; | |
268 | u32 mem_width; | |
269 | }; | |
270 | ||
271 | struct stm32_mdma_device { | |
272 | struct dma_device ddev; | |
273 | void __iomem *base; | |
274 | struct clk *clk; | |
275 | int irq; | |
276 | struct reset_control *rst; | |
277 | u32 nr_channels; | |
278 | u32 nr_requests; | |
279 | u32 nr_ahb_addr_masks; | |
280 | struct stm32_mdma_chan chan[STM32_MDMA_MAX_CHANNELS]; | |
281 | u32 ahb_addr_masks[]; | |
282 | }; | |
283 | ||
284 | static struct stm32_mdma_device *stm32_mdma_get_dev( | |
285 | struct stm32_mdma_chan *chan) | |
286 | { | |
287 | return container_of(chan->vchan.chan.device, struct stm32_mdma_device, | |
288 | ddev); | |
289 | } | |
290 | ||
291 | static struct stm32_mdma_chan *to_stm32_mdma_chan(struct dma_chan *c) | |
292 | { | |
293 | return container_of(c, struct stm32_mdma_chan, vchan.chan); | |
294 | } | |
295 | ||
296 | static struct stm32_mdma_desc *to_stm32_mdma_desc(struct virt_dma_desc *vdesc) | |
297 | { | |
298 | return container_of(vdesc, struct stm32_mdma_desc, vdesc); | |
299 | } | |
300 | ||
301 | static struct device *chan2dev(struct stm32_mdma_chan *chan) | |
302 | { | |
303 | return &chan->vchan.chan.dev->device; | |
304 | } | |
305 | ||
306 | static struct device *mdma2dev(struct stm32_mdma_device *mdma_dev) | |
307 | { | |
308 | return mdma_dev->ddev.dev; | |
309 | } | |
310 | ||
311 | static u32 stm32_mdma_read(struct stm32_mdma_device *dmadev, u32 reg) | |
312 | { | |
313 | return readl_relaxed(dmadev->base + reg); | |
314 | } | |
315 | ||
316 | static void stm32_mdma_write(struct stm32_mdma_device *dmadev, u32 reg, u32 val) | |
317 | { | |
318 | writel_relaxed(val, dmadev->base + reg); | |
319 | } | |
320 | ||
321 | static void stm32_mdma_set_bits(struct stm32_mdma_device *dmadev, u32 reg, | |
322 | u32 mask) | |
323 | { | |
324 | void __iomem *addr = dmadev->base + reg; | |
325 | ||
326 | writel_relaxed(readl_relaxed(addr) | mask, addr); | |
327 | } | |
328 | ||
329 | static void stm32_mdma_clr_bits(struct stm32_mdma_device *dmadev, u32 reg, | |
330 | u32 mask) | |
331 | { | |
332 | void __iomem *addr = dmadev->base + reg; | |
333 | ||
334 | writel_relaxed(readl_relaxed(addr) & ~mask, addr); | |
335 | } | |
336 | ||
337 | static struct stm32_mdma_desc *stm32_mdma_alloc_desc( | |
338 | struct stm32_mdma_chan *chan, u32 count) | |
339 | { | |
340 | struct stm32_mdma_desc *desc; | |
bbb5a4e1 | 341 | int i; |
a4ffb13c | 342 | |
bbb5a4e1 | 343 | desc = kzalloc(offsetof(typeof(*desc), node[count]), GFP_NOWAIT); |
a4ffb13c PYM |
344 | if (!desc) |
345 | return NULL; | |
346 | ||
bbb5a4e1 PYM |
347 | for (i = 0; i < count; i++) { |
348 | desc->node[i].hwdesc = | |
349 | dma_pool_alloc(chan->desc_pool, GFP_NOWAIT, | |
350 | &desc->node[i].hwdesc_phys); | |
351 | if (!desc->node[i].hwdesc) | |
352 | goto err; | |
a4ffb13c PYM |
353 | } |
354 | ||
355 | desc->count = count; | |
356 | ||
357 | return desc; | |
bbb5a4e1 PYM |
358 | |
359 | err: | |
360 | dev_err(chan2dev(chan), "Failed to allocate descriptor\n"); | |
361 | while (--i >= 0) | |
362 | dma_pool_free(chan->desc_pool, desc->node[i].hwdesc, | |
363 | desc->node[i].hwdesc_phys); | |
364 | kfree(desc); | |
365 | return NULL; | |
a4ffb13c PYM |
366 | } |
367 | ||
368 | static void stm32_mdma_desc_free(struct virt_dma_desc *vdesc) | |
369 | { | |
370 | struct stm32_mdma_desc *desc = to_stm32_mdma_desc(vdesc); | |
371 | struct stm32_mdma_chan *chan = to_stm32_mdma_chan(vdesc->tx.chan); | |
bbb5a4e1 | 372 | int i; |
a4ffb13c | 373 | |
bbb5a4e1 PYM |
374 | for (i = 0; i < desc->count; i++) |
375 | dma_pool_free(chan->desc_pool, desc->node[i].hwdesc, | |
376 | desc->node[i].hwdesc_phys); | |
a4ffb13c PYM |
377 | kfree(desc); |
378 | } | |
379 | ||
380 | static int stm32_mdma_get_width(struct stm32_mdma_chan *chan, | |
381 | enum dma_slave_buswidth width) | |
382 | { | |
383 | switch (width) { | |
384 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
385 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
386 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
387 | case DMA_SLAVE_BUSWIDTH_8_BYTES: | |
388 | return ffs(width) - 1; | |
389 | default: | |
390 | dev_err(chan2dev(chan), "Dma bus width %i not supported\n", | |
391 | width); | |
392 | return -EINVAL; | |
393 | } | |
394 | } | |
395 | ||
d83f4131 PYM |
396 | static enum dma_slave_buswidth stm32_mdma_get_max_width(dma_addr_t addr, |
397 | u32 buf_len, u32 tlen) | |
a4ffb13c PYM |
398 | { |
399 | enum dma_slave_buswidth max_width = DMA_SLAVE_BUSWIDTH_8_BYTES; | |
400 | ||
401 | for (max_width = DMA_SLAVE_BUSWIDTH_8_BYTES; | |
402 | max_width > DMA_SLAVE_BUSWIDTH_1_BYTE; | |
403 | max_width >>= 1) { | |
d83f4131 PYM |
404 | /* |
405 | * Address and buffer length both have to be aligned on | |
406 | * bus width | |
407 | */ | |
408 | if ((((buf_len | addr) & (max_width - 1)) == 0) && | |
409 | tlen >= max_width) | |
a4ffb13c PYM |
410 | break; |
411 | } | |
412 | ||
413 | return max_width; | |
414 | } | |
415 | ||
416 | static u32 stm32_mdma_get_best_burst(u32 buf_len, u32 tlen, u32 max_burst, | |
417 | enum dma_slave_buswidth width) | |
418 | { | |
ee6de9ac | 419 | u32 best_burst; |
a4ffb13c | 420 | |
ee6de9ac PYM |
421 | best_burst = min((u32)1 << __ffs(tlen | buf_len), |
422 | max_burst * width) / width; | |
a4ffb13c PYM |
423 | |
424 | return (best_burst > 0) ? best_burst : 1; | |
425 | } | |
426 | ||
427 | static int stm32_mdma_disable_chan(struct stm32_mdma_chan *chan) | |
428 | { | |
429 | struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan); | |
430 | u32 ccr, cisr, id, reg; | |
431 | int ret; | |
432 | ||
433 | id = chan->id; | |
434 | reg = STM32_MDMA_CCR(id); | |
435 | ||
436 | /* Disable interrupts */ | |
437 | stm32_mdma_clr_bits(dmadev, reg, STM32_MDMA_CCR_IRQ_MASK); | |
438 | ||
439 | ccr = stm32_mdma_read(dmadev, reg); | |
440 | if (ccr & STM32_MDMA_CCR_EN) { | |
441 | stm32_mdma_clr_bits(dmadev, reg, STM32_MDMA_CCR_EN); | |
442 | ||
443 | /* Ensure that any ongoing transfer has been completed */ | |
444 | ret = readl_relaxed_poll_timeout_atomic( | |
445 | dmadev->base + STM32_MDMA_CISR(id), cisr, | |
446 | (cisr & STM32_MDMA_CISR_CTCIF), 10, 1000); | |
447 | if (ret) { | |
448 | dev_err(chan2dev(chan), "%s: timeout!\n", __func__); | |
449 | return -EBUSY; | |
450 | } | |
451 | } | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
456 | static void stm32_mdma_stop(struct stm32_mdma_chan *chan) | |
457 | { | |
458 | struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan); | |
459 | u32 status; | |
460 | int ret; | |
461 | ||
462 | /* Disable DMA */ | |
463 | ret = stm32_mdma_disable_chan(chan); | |
464 | if (ret < 0) | |
465 | return; | |
466 | ||
467 | /* Clear interrupt status if it is there */ | |
468 | status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id)); | |
469 | if (status) { | |
470 | dev_dbg(chan2dev(chan), "%s(): clearing interrupt: 0x%08x\n", | |
471 | __func__, status); | |
472 | stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(chan->id), status); | |
473 | } | |
474 | ||
475 | chan->busy = false; | |
476 | } | |
477 | ||
478 | static void stm32_mdma_set_bus(struct stm32_mdma_device *dmadev, u32 *ctbr, | |
479 | u32 ctbr_mask, u32 src_addr) | |
480 | { | |
481 | u32 mask; | |
482 | int i; | |
483 | ||
484 | /* Check if memory device is on AHB or AXI */ | |
485 | *ctbr &= ~ctbr_mask; | |
486 | mask = src_addr & 0xF0000000; | |
487 | for (i = 0; i < dmadev->nr_ahb_addr_masks; i++) { | |
488 | if (mask == dmadev->ahb_addr_masks[i]) { | |
489 | *ctbr |= ctbr_mask; | |
490 | break; | |
491 | } | |
492 | } | |
493 | } | |
494 | ||
495 | static int stm32_mdma_set_xfer_param(struct stm32_mdma_chan *chan, | |
496 | enum dma_transfer_direction direction, | |
497 | u32 *mdma_ccr, u32 *mdma_ctcr, | |
d83f4131 PYM |
498 | u32 *mdma_ctbr, dma_addr_t addr, |
499 | u32 buf_len) | |
a4ffb13c PYM |
500 | { |
501 | struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan); | |
502 | struct stm32_mdma_chan_config *chan_config = &chan->chan_config; | |
503 | enum dma_slave_buswidth src_addr_width, dst_addr_width; | |
504 | phys_addr_t src_addr, dst_addr; | |
505 | int src_bus_width, dst_bus_width; | |
506 | u32 src_maxburst, dst_maxburst, src_best_burst, dst_best_burst; | |
507 | u32 ccr, ctcr, ctbr, tlen; | |
508 | ||
509 | src_addr_width = chan->dma_config.src_addr_width; | |
510 | dst_addr_width = chan->dma_config.dst_addr_width; | |
511 | src_maxburst = chan->dma_config.src_maxburst; | |
512 | dst_maxburst = chan->dma_config.dst_maxburst; | |
513 | ||
514 | ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)); | |
515 | ctcr = stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id)); | |
516 | ctbr = stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id)); | |
517 | ||
518 | /* Enable HW request mode */ | |
519 | ctcr &= ~STM32_MDMA_CTCR_SWRM; | |
520 | ||
521 | /* Set DINC, SINC, DINCOS, SINCOS, TRGM and TLEN retrieve from DT */ | |
522 | ctcr &= ~STM32_MDMA_CTCR_CFG_MASK; | |
523 | ctcr |= chan_config->transfer_config & STM32_MDMA_CTCR_CFG_MASK; | |
524 | ||
525 | /* | |
526 | * For buffer transfer length (TLEN) we have to set | |
527 | * the number of bytes - 1 in CTCR register | |
528 | */ | |
529 | tlen = STM32_MDMA_CTCR_LEN2_GET(ctcr); | |
530 | ctcr &= ~STM32_MDMA_CTCR_LEN2_MSK; | |
531 | ctcr |= STM32_MDMA_CTCR_TLEN((tlen - 1)); | |
532 | ||
d83f4131 PYM |
533 | /* Disable Pack Enable */ |
534 | ctcr &= ~STM32_MDMA_CTCR_PKE; | |
535 | ||
a4ffb13c PYM |
536 | /* Check burst size constraints */ |
537 | if (src_maxburst * src_addr_width > STM32_MDMA_MAX_BURST || | |
538 | dst_maxburst * dst_addr_width > STM32_MDMA_MAX_BURST) { | |
539 | dev_err(chan2dev(chan), | |
540 | "burst size * bus width higher than %d bytes\n", | |
541 | STM32_MDMA_MAX_BURST); | |
542 | return -EINVAL; | |
543 | } | |
544 | ||
545 | if ((!is_power_of_2(src_maxburst) && src_maxburst > 0) || | |
546 | (!is_power_of_2(dst_maxburst) && dst_maxburst > 0)) { | |
547 | dev_err(chan2dev(chan), "burst size must be a power of 2\n"); | |
548 | return -EINVAL; | |
549 | } | |
550 | ||
551 | /* | |
552 | * Configure channel control: | |
553 | * - Clear SW request as in this case this is a HW one | |
554 | * - Clear WEX, HEX and BEX bits | |
555 | * - Set priority level | |
556 | */ | |
557 | ccr &= ~(STM32_MDMA_CCR_SWRQ | STM32_MDMA_CCR_WEX | STM32_MDMA_CCR_HEX | | |
558 | STM32_MDMA_CCR_BEX | STM32_MDMA_CCR_PL_MASK); | |
559 | ccr |= STM32_MDMA_CCR_PL(chan_config->priority_level); | |
560 | ||
561 | /* Configure Trigger selection */ | |
562 | ctbr &= ~STM32_MDMA_CTBR_TSEL_MASK; | |
563 | ctbr |= STM32_MDMA_CTBR_TSEL(chan_config->request); | |
564 | ||
565 | switch (direction) { | |
566 | case DMA_MEM_TO_DEV: | |
d83f4131 PYM |
567 | dst_addr = chan->dma_config.dst_addr; |
568 | ||
a4ffb13c PYM |
569 | /* Set device data size */ |
570 | dst_bus_width = stm32_mdma_get_width(chan, dst_addr_width); | |
571 | if (dst_bus_width < 0) | |
572 | return dst_bus_width; | |
573 | ctcr &= ~STM32_MDMA_CTCR_DSIZE_MASK; | |
574 | ctcr |= STM32_MDMA_CTCR_DSIZE(dst_bus_width); | |
575 | ||
576 | /* Set device burst value */ | |
577 | dst_best_burst = stm32_mdma_get_best_burst(buf_len, tlen, | |
578 | dst_maxburst, | |
579 | dst_addr_width); | |
580 | chan->mem_burst = dst_best_burst; | |
581 | ctcr &= ~STM32_MDMA_CTCR_DBURST_MASK; | |
582 | ctcr |= STM32_MDMA_CTCR_DBURST((ilog2(dst_best_burst))); | |
583 | ||
584 | /* Set memory data size */ | |
d83f4131 | 585 | src_addr_width = stm32_mdma_get_max_width(addr, buf_len, tlen); |
a4ffb13c PYM |
586 | chan->mem_width = src_addr_width; |
587 | src_bus_width = stm32_mdma_get_width(chan, src_addr_width); | |
588 | if (src_bus_width < 0) | |
589 | return src_bus_width; | |
590 | ctcr &= ~STM32_MDMA_CTCR_SSIZE_MASK | | |
591 | STM32_MDMA_CTCR_SINCOS_MASK; | |
592 | ctcr |= STM32_MDMA_CTCR_SSIZE(src_bus_width) | | |
593 | STM32_MDMA_CTCR_SINCOS(src_bus_width); | |
594 | ||
595 | /* Set memory burst value */ | |
596 | src_maxburst = STM32_MDMA_MAX_BUF_LEN / src_addr_width; | |
597 | src_best_burst = stm32_mdma_get_best_burst(buf_len, tlen, | |
598 | src_maxburst, | |
599 | src_addr_width); | |
600 | chan->mem_burst = src_best_burst; | |
601 | ctcr &= ~STM32_MDMA_CTCR_SBURST_MASK; | |
602 | ctcr |= STM32_MDMA_CTCR_SBURST((ilog2(src_best_burst))); | |
603 | ||
604 | /* Select bus */ | |
a4ffb13c PYM |
605 | stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS, |
606 | dst_addr); | |
607 | ||
d83f4131 PYM |
608 | if (dst_bus_width != src_bus_width) |
609 | ctcr |= STM32_MDMA_CTCR_PKE; | |
610 | ||
a4ffb13c PYM |
611 | /* Set destination address */ |
612 | stm32_mdma_write(dmadev, STM32_MDMA_CDAR(chan->id), dst_addr); | |
613 | break; | |
614 | ||
615 | case DMA_DEV_TO_MEM: | |
d83f4131 PYM |
616 | src_addr = chan->dma_config.src_addr; |
617 | ||
a4ffb13c PYM |
618 | /* Set device data size */ |
619 | src_bus_width = stm32_mdma_get_width(chan, src_addr_width); | |
620 | if (src_bus_width < 0) | |
621 | return src_bus_width; | |
622 | ctcr &= ~STM32_MDMA_CTCR_SSIZE_MASK; | |
623 | ctcr |= STM32_MDMA_CTCR_SSIZE(src_bus_width); | |
624 | ||
625 | /* Set device burst value */ | |
626 | src_best_burst = stm32_mdma_get_best_burst(buf_len, tlen, | |
627 | src_maxburst, | |
628 | src_addr_width); | |
629 | ctcr &= ~STM32_MDMA_CTCR_SBURST_MASK; | |
630 | ctcr |= STM32_MDMA_CTCR_SBURST((ilog2(src_best_burst))); | |
631 | ||
632 | /* Set memory data size */ | |
d83f4131 | 633 | dst_addr_width = stm32_mdma_get_max_width(addr, buf_len, tlen); |
a4ffb13c PYM |
634 | chan->mem_width = dst_addr_width; |
635 | dst_bus_width = stm32_mdma_get_width(chan, dst_addr_width); | |
636 | if (dst_bus_width < 0) | |
637 | return dst_bus_width; | |
638 | ctcr &= ~(STM32_MDMA_CTCR_DSIZE_MASK | | |
639 | STM32_MDMA_CTCR_DINCOS_MASK); | |
640 | ctcr |= STM32_MDMA_CTCR_DSIZE(dst_bus_width) | | |
641 | STM32_MDMA_CTCR_DINCOS(dst_bus_width); | |
642 | ||
643 | /* Set memory burst value */ | |
644 | dst_maxburst = STM32_MDMA_MAX_BUF_LEN / dst_addr_width; | |
645 | dst_best_burst = stm32_mdma_get_best_burst(buf_len, tlen, | |
646 | dst_maxburst, | |
647 | dst_addr_width); | |
648 | ctcr &= ~STM32_MDMA_CTCR_DBURST_MASK; | |
649 | ctcr |= STM32_MDMA_CTCR_DBURST((ilog2(dst_best_burst))); | |
650 | ||
651 | /* Select bus */ | |
a4ffb13c PYM |
652 | stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS, |
653 | src_addr); | |
654 | ||
d83f4131 PYM |
655 | if (dst_bus_width != src_bus_width) |
656 | ctcr |= STM32_MDMA_CTCR_PKE; | |
657 | ||
a4ffb13c PYM |
658 | /* Set source address */ |
659 | stm32_mdma_write(dmadev, STM32_MDMA_CSAR(chan->id), src_addr); | |
660 | break; | |
661 | ||
662 | default: | |
663 | dev_err(chan2dev(chan), "Dma direction is not supported\n"); | |
664 | return -EINVAL; | |
665 | } | |
666 | ||
667 | *mdma_ccr = ccr; | |
668 | *mdma_ctcr = ctcr; | |
669 | *mdma_ctbr = ctbr; | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | static void stm32_mdma_dump_hwdesc(struct stm32_mdma_chan *chan, | |
bbb5a4e1 | 675 | struct stm32_mdma_desc_node *node) |
a4ffb13c | 676 | { |
bbb5a4e1 PYM |
677 | dev_dbg(chan2dev(chan), "hwdesc: %pad\n", &node->hwdesc_phys); |
678 | dev_dbg(chan2dev(chan), "CTCR: 0x%08x\n", node->hwdesc->ctcr); | |
679 | dev_dbg(chan2dev(chan), "CBNDTR: 0x%08x\n", node->hwdesc->cbndtr); | |
680 | dev_dbg(chan2dev(chan), "CSAR: 0x%08x\n", node->hwdesc->csar); | |
681 | dev_dbg(chan2dev(chan), "CDAR: 0x%08x\n", node->hwdesc->cdar); | |
682 | dev_dbg(chan2dev(chan), "CBRUR: 0x%08x\n", node->hwdesc->cbrur); | |
683 | dev_dbg(chan2dev(chan), "CLAR: 0x%08x\n", node->hwdesc->clar); | |
684 | dev_dbg(chan2dev(chan), "CTBR: 0x%08x\n", node->hwdesc->ctbr); | |
685 | dev_dbg(chan2dev(chan), "CMAR: 0x%08x\n", node->hwdesc->cmar); | |
686 | dev_dbg(chan2dev(chan), "CMDR: 0x%08x\n\n", node->hwdesc->cmdr); | |
a4ffb13c PYM |
687 | } |
688 | ||
689 | static void stm32_mdma_setup_hwdesc(struct stm32_mdma_chan *chan, | |
690 | struct stm32_mdma_desc *desc, | |
691 | enum dma_transfer_direction dir, u32 count, | |
692 | dma_addr_t src_addr, dma_addr_t dst_addr, | |
693 | u32 len, u32 ctcr, u32 ctbr, bool is_last, | |
694 | bool is_first, bool is_cyclic) | |
695 | { | |
696 | struct stm32_mdma_chan_config *config = &chan->chan_config; | |
697 | struct stm32_mdma_hwdesc *hwdesc; | |
698 | u32 next = count + 1; | |
699 | ||
bbb5a4e1 | 700 | hwdesc = desc->node[count].hwdesc; |
a4ffb13c PYM |
701 | hwdesc->ctcr = ctcr; |
702 | hwdesc->cbndtr &= ~(STM32_MDMA_CBNDTR_BRC_MK | | |
703 | STM32_MDMA_CBNDTR_BRDUM | | |
704 | STM32_MDMA_CBNDTR_BRSUM | | |
705 | STM32_MDMA_CBNDTR_BNDT_MASK); | |
706 | hwdesc->cbndtr |= STM32_MDMA_CBNDTR_BNDT(len); | |
707 | hwdesc->csar = src_addr; | |
708 | hwdesc->cdar = dst_addr; | |
709 | hwdesc->cbrur = 0; | |
a4ffb13c PYM |
710 | hwdesc->ctbr = ctbr; |
711 | hwdesc->cmar = config->mask_addr; | |
712 | hwdesc->cmdr = config->mask_data; | |
713 | ||
714 | if (is_last) { | |
715 | if (is_cyclic) | |
bbb5a4e1 | 716 | hwdesc->clar = desc->node[0].hwdesc_phys; |
a4ffb13c PYM |
717 | else |
718 | hwdesc->clar = 0; | |
bbb5a4e1 PYM |
719 | } else { |
720 | hwdesc->clar = desc->node[next].hwdesc_phys; | |
a4ffb13c PYM |
721 | } |
722 | ||
bbb5a4e1 | 723 | stm32_mdma_dump_hwdesc(chan, &desc->node[count]); |
a4ffb13c PYM |
724 | } |
725 | ||
726 | static int stm32_mdma_setup_xfer(struct stm32_mdma_chan *chan, | |
727 | struct stm32_mdma_desc *desc, | |
728 | struct scatterlist *sgl, u32 sg_len, | |
729 | enum dma_transfer_direction direction) | |
730 | { | |
731 | struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan); | |
732 | struct dma_slave_config *dma_config = &chan->dma_config; | |
733 | struct scatterlist *sg; | |
734 | dma_addr_t src_addr, dst_addr; | |
735 | u32 ccr, ctcr, ctbr; | |
736 | int i, ret = 0; | |
737 | ||
738 | for_each_sg(sgl, sg, sg_len, i) { | |
739 | if (sg_dma_len(sg) > STM32_MDMA_MAX_BLOCK_LEN) { | |
740 | dev_err(chan2dev(chan), "Invalid block len\n"); | |
741 | return -EINVAL; | |
742 | } | |
743 | ||
a4ffb13c PYM |
744 | if (direction == DMA_MEM_TO_DEV) { |
745 | src_addr = sg_dma_address(sg); | |
746 | dst_addr = dma_config->dst_addr; | |
d83f4131 PYM |
747 | ret = stm32_mdma_set_xfer_param(chan, direction, &ccr, |
748 | &ctcr, &ctbr, src_addr, | |
749 | sg_dma_len(sg)); | |
a4ffb13c PYM |
750 | stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS, |
751 | src_addr); | |
752 | } else { | |
753 | src_addr = dma_config->src_addr; | |
754 | dst_addr = sg_dma_address(sg); | |
d83f4131 PYM |
755 | ret = stm32_mdma_set_xfer_param(chan, direction, &ccr, |
756 | &ctcr, &ctbr, dst_addr, | |
757 | sg_dma_len(sg)); | |
a4ffb13c PYM |
758 | stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS, |
759 | dst_addr); | |
760 | } | |
761 | ||
d83f4131 PYM |
762 | if (ret < 0) |
763 | return ret; | |
764 | ||
a4ffb13c PYM |
765 | stm32_mdma_setup_hwdesc(chan, desc, direction, i, src_addr, |
766 | dst_addr, sg_dma_len(sg), ctcr, ctbr, | |
767 | i == sg_len - 1, i == 0, false); | |
768 | } | |
769 | ||
770 | /* Enable interrupts */ | |
771 | ccr &= ~STM32_MDMA_CCR_IRQ_MASK; | |
772 | ccr |= STM32_MDMA_CCR_TEIE | STM32_MDMA_CCR_CTCIE; | |
773 | if (sg_len > 1) | |
774 | ccr |= STM32_MDMA_CCR_BTIE; | |
775 | desc->ccr = ccr; | |
776 | ||
777 | return 0; | |
778 | } | |
779 | ||
780 | static struct dma_async_tx_descriptor * | |
781 | stm32_mdma_prep_slave_sg(struct dma_chan *c, struct scatterlist *sgl, | |
782 | u32 sg_len, enum dma_transfer_direction direction, | |
783 | unsigned long flags, void *context) | |
784 | { | |
785 | struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c); | |
786 | struct stm32_mdma_desc *desc; | |
bbb5a4e1 | 787 | int i, ret; |
a4ffb13c PYM |
788 | |
789 | /* | |
790 | * Once DMA is in setup cyclic mode the channel we cannot assign this | |
791 | * channel anymore. The DMA channel needs to be aborted or terminated | |
792 | * for allowing another request. | |
793 | */ | |
794 | if (chan->desc && chan->desc->cyclic) { | |
795 | dev_err(chan2dev(chan), | |
796 | "Request not allowed when dma in cyclic mode\n"); | |
797 | return NULL; | |
798 | } | |
799 | ||
800 | desc = stm32_mdma_alloc_desc(chan, sg_len); | |
801 | if (!desc) | |
802 | return NULL; | |
803 | ||
804 | ret = stm32_mdma_setup_xfer(chan, desc, sgl, sg_len, direction); | |
805 | if (ret < 0) | |
806 | goto xfer_setup_err; | |
807 | ||
808 | desc->cyclic = false; | |
809 | ||
810 | return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags); | |
811 | ||
812 | xfer_setup_err: | |
bbb5a4e1 PYM |
813 | for (i = 0; i < desc->count; i++) |
814 | dma_pool_free(chan->desc_pool, desc->node[i].hwdesc, | |
815 | desc->node[i].hwdesc_phys); | |
a4ffb13c PYM |
816 | kfree(desc); |
817 | return NULL; | |
818 | } | |
819 | ||
820 | static struct dma_async_tx_descriptor * | |
821 | stm32_mdma_prep_dma_cyclic(struct dma_chan *c, dma_addr_t buf_addr, | |
822 | size_t buf_len, size_t period_len, | |
823 | enum dma_transfer_direction direction, | |
824 | unsigned long flags) | |
825 | { | |
826 | struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c); | |
827 | struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan); | |
828 | struct dma_slave_config *dma_config = &chan->dma_config; | |
829 | struct stm32_mdma_desc *desc; | |
830 | dma_addr_t src_addr, dst_addr; | |
831 | u32 ccr, ctcr, ctbr, count; | |
832 | int i, ret; | |
833 | ||
834 | /* | |
835 | * Once DMA is in setup cyclic mode the channel we cannot assign this | |
836 | * channel anymore. The DMA channel needs to be aborted or terminated | |
837 | * for allowing another request. | |
838 | */ | |
839 | if (chan->desc && chan->desc->cyclic) { | |
840 | dev_err(chan2dev(chan), | |
841 | "Request not allowed when dma in cyclic mode\n"); | |
842 | return NULL; | |
843 | } | |
844 | ||
845 | if (!buf_len || !period_len || period_len > STM32_MDMA_MAX_BLOCK_LEN) { | |
846 | dev_err(chan2dev(chan), "Invalid buffer/period len\n"); | |
847 | return NULL; | |
848 | } | |
849 | ||
850 | if (buf_len % period_len) { | |
851 | dev_err(chan2dev(chan), "buf_len not multiple of period_len\n"); | |
852 | return NULL; | |
853 | } | |
854 | ||
855 | count = buf_len / period_len; | |
856 | ||
857 | desc = stm32_mdma_alloc_desc(chan, count); | |
858 | if (!desc) | |
859 | return NULL; | |
860 | ||
a4ffb13c PYM |
861 | /* Select bus */ |
862 | if (direction == DMA_MEM_TO_DEV) { | |
863 | src_addr = buf_addr; | |
d83f4131 PYM |
864 | ret = stm32_mdma_set_xfer_param(chan, direction, &ccr, &ctcr, |
865 | &ctbr, src_addr, period_len); | |
a4ffb13c PYM |
866 | stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS, |
867 | src_addr); | |
868 | } else { | |
869 | dst_addr = buf_addr; | |
d83f4131 PYM |
870 | ret = stm32_mdma_set_xfer_param(chan, direction, &ccr, &ctcr, |
871 | &ctbr, dst_addr, period_len); | |
a4ffb13c PYM |
872 | stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS, |
873 | dst_addr); | |
874 | } | |
875 | ||
d83f4131 PYM |
876 | if (ret < 0) |
877 | goto xfer_setup_err; | |
878 | ||
879 | /* Enable interrupts */ | |
880 | ccr &= ~STM32_MDMA_CCR_IRQ_MASK; | |
881 | ccr |= STM32_MDMA_CCR_TEIE | STM32_MDMA_CCR_CTCIE | STM32_MDMA_CCR_BTIE; | |
882 | desc->ccr = ccr; | |
883 | ||
a4ffb13c PYM |
884 | /* Configure hwdesc list */ |
885 | for (i = 0; i < count; i++) { | |
886 | if (direction == DMA_MEM_TO_DEV) { | |
887 | src_addr = buf_addr + i * period_len; | |
888 | dst_addr = dma_config->dst_addr; | |
889 | } else { | |
890 | src_addr = dma_config->src_addr; | |
891 | dst_addr = buf_addr + i * period_len; | |
892 | } | |
893 | ||
894 | stm32_mdma_setup_hwdesc(chan, desc, direction, i, src_addr, | |
895 | dst_addr, period_len, ctcr, ctbr, | |
896 | i == count - 1, i == 0, true); | |
897 | } | |
898 | ||
899 | desc->cyclic = true; | |
900 | ||
901 | return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags); | |
902 | ||
903 | xfer_setup_err: | |
bbb5a4e1 PYM |
904 | for (i = 0; i < desc->count; i++) |
905 | dma_pool_free(chan->desc_pool, desc->node[i].hwdesc, | |
906 | desc->node[i].hwdesc_phys); | |
a4ffb13c PYM |
907 | kfree(desc); |
908 | return NULL; | |
909 | } | |
910 | ||
911 | static struct dma_async_tx_descriptor * | |
912 | stm32_mdma_prep_dma_memcpy(struct dma_chan *c, dma_addr_t dest, dma_addr_t src, | |
913 | size_t len, unsigned long flags) | |
914 | { | |
915 | struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c); | |
916 | struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan); | |
917 | enum dma_slave_buswidth max_width; | |
918 | struct stm32_mdma_desc *desc; | |
919 | struct stm32_mdma_hwdesc *hwdesc; | |
920 | u32 ccr, ctcr, ctbr, cbndtr, count, max_burst, mdma_burst; | |
921 | u32 best_burst, tlen; | |
922 | size_t xfer_count, offset; | |
923 | int src_bus_width, dst_bus_width; | |
924 | int i; | |
925 | ||
926 | /* | |
927 | * Once DMA is in setup cyclic mode the channel we cannot assign this | |
928 | * channel anymore. The DMA channel needs to be aborted or terminated | |
929 | * to allow another request | |
930 | */ | |
931 | if (chan->desc && chan->desc->cyclic) { | |
932 | dev_err(chan2dev(chan), | |
933 | "Request not allowed when dma in cyclic mode\n"); | |
934 | return NULL; | |
935 | } | |
936 | ||
937 | count = DIV_ROUND_UP(len, STM32_MDMA_MAX_BLOCK_LEN); | |
938 | desc = stm32_mdma_alloc_desc(chan, count); | |
939 | if (!desc) | |
940 | return NULL; | |
941 | ||
942 | ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)); | |
943 | ctcr = stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id)); | |
944 | ctbr = stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id)); | |
945 | cbndtr = stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id)); | |
946 | ||
947 | /* Enable sw req, some interrupts and clear other bits */ | |
948 | ccr &= ~(STM32_MDMA_CCR_WEX | STM32_MDMA_CCR_HEX | | |
949 | STM32_MDMA_CCR_BEX | STM32_MDMA_CCR_PL_MASK | | |
950 | STM32_MDMA_CCR_IRQ_MASK); | |
951 | ccr |= STM32_MDMA_CCR_TEIE; | |
952 | ||
953 | /* Enable SW request mode, dest/src inc and clear other bits */ | |
954 | ctcr &= ~(STM32_MDMA_CTCR_BWM | STM32_MDMA_CTCR_TRGM_MSK | | |
955 | STM32_MDMA_CTCR_PAM_MASK | STM32_MDMA_CTCR_PKE | | |
956 | STM32_MDMA_CTCR_TLEN_MSK | STM32_MDMA_CTCR_DBURST_MASK | | |
957 | STM32_MDMA_CTCR_SBURST_MASK | STM32_MDMA_CTCR_DINCOS_MASK | | |
958 | STM32_MDMA_CTCR_SINCOS_MASK | STM32_MDMA_CTCR_DSIZE_MASK | | |
959 | STM32_MDMA_CTCR_SSIZE_MASK | STM32_MDMA_CTCR_DINC_MASK | | |
960 | STM32_MDMA_CTCR_SINC_MASK); | |
961 | ctcr |= STM32_MDMA_CTCR_SWRM | STM32_MDMA_CTCR_SINC(STM32_MDMA_INC) | | |
962 | STM32_MDMA_CTCR_DINC(STM32_MDMA_INC); | |
963 | ||
964 | /* Reset HW request */ | |
965 | ctbr &= ~STM32_MDMA_CTBR_TSEL_MASK; | |
966 | ||
967 | /* Select bus */ | |
968 | stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS, src); | |
969 | stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS, dest); | |
970 | ||
971 | /* Clear CBNDTR registers */ | |
972 | cbndtr &= ~(STM32_MDMA_CBNDTR_BRC_MK | STM32_MDMA_CBNDTR_BRDUM | | |
973 | STM32_MDMA_CBNDTR_BRSUM | STM32_MDMA_CBNDTR_BNDT_MASK); | |
974 | ||
975 | if (len <= STM32_MDMA_MAX_BLOCK_LEN) { | |
976 | cbndtr |= STM32_MDMA_CBNDTR_BNDT(len); | |
977 | if (len <= STM32_MDMA_MAX_BUF_LEN) { | |
978 | /* Setup a buffer transfer */ | |
979 | ccr |= STM32_MDMA_CCR_TCIE | STM32_MDMA_CCR_CTCIE; | |
980 | ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_BUFFER); | |
981 | } else { | |
982 | /* Setup a block transfer */ | |
983 | ccr |= STM32_MDMA_CCR_BTIE | STM32_MDMA_CCR_CTCIE; | |
984 | ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_BLOCK); | |
985 | } | |
986 | ||
987 | tlen = STM32_MDMA_MAX_BUF_LEN; | |
988 | ctcr |= STM32_MDMA_CTCR_TLEN((tlen - 1)); | |
989 | ||
990 | /* Set source best burst size */ | |
d83f4131 | 991 | max_width = stm32_mdma_get_max_width(src, len, tlen); |
a4ffb13c PYM |
992 | src_bus_width = stm32_mdma_get_width(chan, max_width); |
993 | ||
994 | max_burst = tlen / max_width; | |
995 | best_burst = stm32_mdma_get_best_burst(len, tlen, max_burst, | |
996 | max_width); | |
997 | mdma_burst = ilog2(best_burst); | |
998 | ||
999 | ctcr |= STM32_MDMA_CTCR_SBURST(mdma_burst) | | |
1000 | STM32_MDMA_CTCR_SSIZE(src_bus_width) | | |
1001 | STM32_MDMA_CTCR_SINCOS(src_bus_width); | |
1002 | ||
1003 | /* Set destination best burst size */ | |
d83f4131 | 1004 | max_width = stm32_mdma_get_max_width(dest, len, tlen); |
a4ffb13c PYM |
1005 | dst_bus_width = stm32_mdma_get_width(chan, max_width); |
1006 | ||
1007 | max_burst = tlen / max_width; | |
1008 | best_burst = stm32_mdma_get_best_burst(len, tlen, max_burst, | |
1009 | max_width); | |
1010 | mdma_burst = ilog2(best_burst); | |
1011 | ||
1012 | ctcr |= STM32_MDMA_CTCR_DBURST(mdma_burst) | | |
1013 | STM32_MDMA_CTCR_DSIZE(dst_bus_width) | | |
1014 | STM32_MDMA_CTCR_DINCOS(dst_bus_width); | |
1015 | ||
1016 | if (dst_bus_width != src_bus_width) | |
1017 | ctcr |= STM32_MDMA_CTCR_PKE; | |
1018 | ||
1019 | /* Prepare hardware descriptor */ | |
bbb5a4e1 | 1020 | hwdesc = desc->node[0].hwdesc; |
a4ffb13c PYM |
1021 | hwdesc->ctcr = ctcr; |
1022 | hwdesc->cbndtr = cbndtr; | |
1023 | hwdesc->csar = src; | |
1024 | hwdesc->cdar = dest; | |
1025 | hwdesc->cbrur = 0; | |
1026 | hwdesc->clar = 0; | |
1027 | hwdesc->ctbr = ctbr; | |
1028 | hwdesc->cmar = 0; | |
1029 | hwdesc->cmdr = 0; | |
1030 | ||
bbb5a4e1 | 1031 | stm32_mdma_dump_hwdesc(chan, &desc->node[0]); |
a4ffb13c PYM |
1032 | } else { |
1033 | /* Setup a LLI transfer */ | |
1034 | ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_LINKED_LIST) | | |
1035 | STM32_MDMA_CTCR_TLEN((STM32_MDMA_MAX_BUF_LEN - 1)); | |
1036 | ccr |= STM32_MDMA_CCR_BTIE | STM32_MDMA_CCR_CTCIE; | |
1037 | tlen = STM32_MDMA_MAX_BUF_LEN; | |
1038 | ||
1039 | for (i = 0, offset = 0; offset < len; | |
1040 | i++, offset += xfer_count) { | |
1041 | xfer_count = min_t(size_t, len - offset, | |
1042 | STM32_MDMA_MAX_BLOCK_LEN); | |
1043 | ||
1044 | /* Set source best burst size */ | |
d83f4131 | 1045 | max_width = stm32_mdma_get_max_width(src, len, tlen); |
a4ffb13c PYM |
1046 | src_bus_width = stm32_mdma_get_width(chan, max_width); |
1047 | ||
1048 | max_burst = tlen / max_width; | |
1049 | best_burst = stm32_mdma_get_best_burst(len, tlen, | |
1050 | max_burst, | |
1051 | max_width); | |
1052 | mdma_burst = ilog2(best_burst); | |
1053 | ||
1054 | ctcr |= STM32_MDMA_CTCR_SBURST(mdma_burst) | | |
1055 | STM32_MDMA_CTCR_SSIZE(src_bus_width) | | |
1056 | STM32_MDMA_CTCR_SINCOS(src_bus_width); | |
1057 | ||
1058 | /* Set destination best burst size */ | |
d83f4131 | 1059 | max_width = stm32_mdma_get_max_width(dest, len, tlen); |
a4ffb13c PYM |
1060 | dst_bus_width = stm32_mdma_get_width(chan, max_width); |
1061 | ||
1062 | max_burst = tlen / max_width; | |
1063 | best_burst = stm32_mdma_get_best_burst(len, tlen, | |
1064 | max_burst, | |
1065 | max_width); | |
1066 | mdma_burst = ilog2(best_burst); | |
1067 | ||
1068 | ctcr |= STM32_MDMA_CTCR_DBURST(mdma_burst) | | |
1069 | STM32_MDMA_CTCR_DSIZE(dst_bus_width) | | |
1070 | STM32_MDMA_CTCR_DINCOS(dst_bus_width); | |
1071 | ||
1072 | if (dst_bus_width != src_bus_width) | |
1073 | ctcr |= STM32_MDMA_CTCR_PKE; | |
1074 | ||
1075 | /* Prepare hardware descriptor */ | |
1076 | stm32_mdma_setup_hwdesc(chan, desc, DMA_MEM_TO_MEM, i, | |
1077 | src + offset, dest + offset, | |
1078 | xfer_count, ctcr, ctbr, | |
1079 | i == count - 1, i == 0, false); | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | desc->ccr = ccr; | |
1084 | ||
1085 | desc->cyclic = false; | |
1086 | ||
1087 | return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags); | |
1088 | } | |
1089 | ||
1090 | static void stm32_mdma_dump_reg(struct stm32_mdma_chan *chan) | |
1091 | { | |
1092 | struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan); | |
1093 | ||
1094 | dev_dbg(chan2dev(chan), "CCR: 0x%08x\n", | |
1095 | stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id))); | |
1096 | dev_dbg(chan2dev(chan), "CTCR: 0x%08x\n", | |
1097 | stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id))); | |
1098 | dev_dbg(chan2dev(chan), "CBNDTR: 0x%08x\n", | |
1099 | stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id))); | |
1100 | dev_dbg(chan2dev(chan), "CSAR: 0x%08x\n", | |
1101 | stm32_mdma_read(dmadev, STM32_MDMA_CSAR(chan->id))); | |
1102 | dev_dbg(chan2dev(chan), "CDAR: 0x%08x\n", | |
1103 | stm32_mdma_read(dmadev, STM32_MDMA_CDAR(chan->id))); | |
1104 | dev_dbg(chan2dev(chan), "CBRUR: 0x%08x\n", | |
1105 | stm32_mdma_read(dmadev, STM32_MDMA_CBRUR(chan->id))); | |
1106 | dev_dbg(chan2dev(chan), "CLAR: 0x%08x\n", | |
1107 | stm32_mdma_read(dmadev, STM32_MDMA_CLAR(chan->id))); | |
1108 | dev_dbg(chan2dev(chan), "CTBR: 0x%08x\n", | |
1109 | stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id))); | |
1110 | dev_dbg(chan2dev(chan), "CMAR: 0x%08x\n", | |
1111 | stm32_mdma_read(dmadev, STM32_MDMA_CMAR(chan->id))); | |
1112 | dev_dbg(chan2dev(chan), "CMDR: 0x%08x\n", | |
1113 | stm32_mdma_read(dmadev, STM32_MDMA_CMDR(chan->id))); | |
1114 | } | |
1115 | ||
1116 | static void stm32_mdma_start_transfer(struct stm32_mdma_chan *chan) | |
1117 | { | |
1118 | struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan); | |
1119 | struct virt_dma_desc *vdesc; | |
1120 | struct stm32_mdma_hwdesc *hwdesc; | |
1121 | u32 id = chan->id; | |
1122 | u32 status, reg; | |
1123 | ||
1124 | vdesc = vchan_next_desc(&chan->vchan); | |
1125 | if (!vdesc) { | |
1126 | chan->desc = NULL; | |
1127 | return; | |
1128 | } | |
1129 | ||
1130 | chan->desc = to_stm32_mdma_desc(vdesc); | |
bbb5a4e1 | 1131 | hwdesc = chan->desc->node[0].hwdesc; |
a4ffb13c PYM |
1132 | chan->curr_hwdesc = 0; |
1133 | ||
1134 | stm32_mdma_write(dmadev, STM32_MDMA_CCR(id), chan->desc->ccr); | |
1135 | stm32_mdma_write(dmadev, STM32_MDMA_CTCR(id), hwdesc->ctcr); | |
1136 | stm32_mdma_write(dmadev, STM32_MDMA_CBNDTR(id), hwdesc->cbndtr); | |
1137 | stm32_mdma_write(dmadev, STM32_MDMA_CSAR(id), hwdesc->csar); | |
1138 | stm32_mdma_write(dmadev, STM32_MDMA_CDAR(id), hwdesc->cdar); | |
1139 | stm32_mdma_write(dmadev, STM32_MDMA_CBRUR(id), hwdesc->cbrur); | |
1140 | stm32_mdma_write(dmadev, STM32_MDMA_CLAR(id), hwdesc->clar); | |
1141 | stm32_mdma_write(dmadev, STM32_MDMA_CTBR(id), hwdesc->ctbr); | |
1142 | stm32_mdma_write(dmadev, STM32_MDMA_CMAR(id), hwdesc->cmar); | |
1143 | stm32_mdma_write(dmadev, STM32_MDMA_CMDR(id), hwdesc->cmdr); | |
1144 | ||
1145 | /* Clear interrupt status if it is there */ | |
1146 | status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(id)); | |
1147 | if (status) | |
1148 | stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(id), status); | |
1149 | ||
1150 | stm32_mdma_dump_reg(chan); | |
1151 | ||
1152 | /* Start DMA */ | |
1153 | stm32_mdma_set_bits(dmadev, STM32_MDMA_CCR(id), STM32_MDMA_CCR_EN); | |
1154 | ||
1155 | /* Set SW request in case of MEM2MEM transfer */ | |
1156 | if (hwdesc->ctcr & STM32_MDMA_CTCR_SWRM) { | |
1157 | reg = STM32_MDMA_CCR(id); | |
1158 | stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_SWRQ); | |
1159 | } | |
1160 | ||
1161 | chan->busy = true; | |
1162 | ||
90ec93cb | 1163 | dev_dbg(chan2dev(chan), "vchan %pK: started\n", &chan->vchan); |
a4ffb13c PYM |
1164 | } |
1165 | ||
1166 | static void stm32_mdma_issue_pending(struct dma_chan *c) | |
1167 | { | |
1168 | struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c); | |
1169 | unsigned long flags; | |
1170 | ||
1171 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
1172 | ||
1173 | if (!vchan_issue_pending(&chan->vchan)) | |
1174 | goto end; | |
1175 | ||
90ec93cb | 1176 | dev_dbg(chan2dev(chan), "vchan %pK: issued\n", &chan->vchan); |
a4ffb13c PYM |
1177 | |
1178 | if (!chan->desc && !chan->busy) | |
1179 | stm32_mdma_start_transfer(chan); | |
1180 | ||
1181 | end: | |
1182 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
1183 | } | |
1184 | ||
1185 | static int stm32_mdma_pause(struct dma_chan *c) | |
1186 | { | |
1187 | struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c); | |
1188 | unsigned long flags; | |
1189 | int ret; | |
1190 | ||
1191 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
1192 | ret = stm32_mdma_disable_chan(chan); | |
1193 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
1194 | ||
1195 | if (!ret) | |
90ec93cb | 1196 | dev_dbg(chan2dev(chan), "vchan %pK: pause\n", &chan->vchan); |
a4ffb13c PYM |
1197 | |
1198 | return ret; | |
1199 | } | |
1200 | ||
1201 | static int stm32_mdma_resume(struct dma_chan *c) | |
1202 | { | |
1203 | struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c); | |
1204 | struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan); | |
1205 | struct stm32_mdma_hwdesc *hwdesc; | |
1206 | unsigned long flags; | |
1207 | u32 status, reg; | |
1208 | ||
bbb5a4e1 | 1209 | hwdesc = chan->desc->node[chan->curr_hwdesc].hwdesc; |
a4ffb13c PYM |
1210 | |
1211 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
1212 | ||
1213 | /* Re-configure control register */ | |
1214 | stm32_mdma_write(dmadev, STM32_MDMA_CCR(chan->id), chan->desc->ccr); | |
1215 | ||
1216 | /* Clear interrupt status if it is there */ | |
1217 | status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id)); | |
1218 | if (status) | |
1219 | stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(chan->id), status); | |
1220 | ||
1221 | stm32_mdma_dump_reg(chan); | |
1222 | ||
1223 | /* Re-start DMA */ | |
1224 | reg = STM32_MDMA_CCR(chan->id); | |
1225 | stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_EN); | |
1226 | ||
1227 | /* Set SW request in case of MEM2MEM transfer */ | |
1228 | if (hwdesc->ctcr & STM32_MDMA_CTCR_SWRM) | |
1229 | stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_SWRQ); | |
1230 | ||
1231 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
1232 | ||
90ec93cb | 1233 | dev_dbg(chan2dev(chan), "vchan %pK: resume\n", &chan->vchan); |
a4ffb13c PYM |
1234 | |
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | static int stm32_mdma_terminate_all(struct dma_chan *c) | |
1239 | { | |
1240 | struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c); | |
1241 | unsigned long flags; | |
1242 | LIST_HEAD(head); | |
1243 | ||
1244 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
1245 | if (chan->busy) { | |
1246 | stm32_mdma_stop(chan); | |
1247 | chan->desc = NULL; | |
1248 | } | |
1249 | vchan_get_all_descriptors(&chan->vchan, &head); | |
1250 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
1251 | ||
1252 | vchan_dma_desc_free_list(&chan->vchan, &head); | |
1253 | ||
1254 | return 0; | |
1255 | } | |
1256 | ||
1257 | static void stm32_mdma_synchronize(struct dma_chan *c) | |
1258 | { | |
1259 | struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c); | |
1260 | ||
1261 | vchan_synchronize(&chan->vchan); | |
1262 | } | |
1263 | ||
1264 | static int stm32_mdma_slave_config(struct dma_chan *c, | |
1265 | struct dma_slave_config *config) | |
1266 | { | |
1267 | struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c); | |
1268 | ||
1269 | memcpy(&chan->dma_config, config, sizeof(*config)); | |
1270 | ||
1271 | return 0; | |
1272 | } | |
1273 | ||
1274 | static size_t stm32_mdma_desc_residue(struct stm32_mdma_chan *chan, | |
1275 | struct stm32_mdma_desc *desc, | |
1276 | u32 curr_hwdesc) | |
1277 | { | |
1278 | struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan); | |
bbb5a4e1 | 1279 | struct stm32_mdma_hwdesc *hwdesc = desc->node[0].hwdesc; |
a4ffb13c PYM |
1280 | u32 cbndtr, residue, modulo, burst_size; |
1281 | int i; | |
1282 | ||
1283 | residue = 0; | |
1284 | for (i = curr_hwdesc + 1; i < desc->count; i++) { | |
bbb5a4e1 | 1285 | hwdesc = desc->node[i].hwdesc; |
a4ffb13c PYM |
1286 | residue += STM32_MDMA_CBNDTR_BNDT(hwdesc->cbndtr); |
1287 | } | |
1288 | cbndtr = stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id)); | |
1289 | residue += cbndtr & STM32_MDMA_CBNDTR_BNDT_MASK; | |
1290 | ||
1291 | if (!chan->mem_burst) | |
1292 | return residue; | |
1293 | ||
1294 | burst_size = chan->mem_burst * chan->mem_width; | |
1295 | modulo = residue % burst_size; | |
1296 | if (modulo) | |
1297 | residue = residue - modulo + burst_size; | |
1298 | ||
1299 | return residue; | |
1300 | } | |
1301 | ||
1302 | static enum dma_status stm32_mdma_tx_status(struct dma_chan *c, | |
1303 | dma_cookie_t cookie, | |
1304 | struct dma_tx_state *state) | |
1305 | { | |
1306 | struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c); | |
1307 | struct virt_dma_desc *vdesc; | |
1308 | enum dma_status status; | |
1309 | unsigned long flags; | |
1310 | u32 residue = 0; | |
1311 | ||
1312 | status = dma_cookie_status(c, cookie, state); | |
1313 | if ((status == DMA_COMPLETE) || (!state)) | |
1314 | return status; | |
1315 | ||
1316 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
1317 | ||
1318 | vdesc = vchan_find_desc(&chan->vchan, cookie); | |
1319 | if (chan->desc && cookie == chan->desc->vdesc.tx.cookie) | |
1320 | residue = stm32_mdma_desc_residue(chan, chan->desc, | |
1321 | chan->curr_hwdesc); | |
1322 | else if (vdesc) | |
1323 | residue = stm32_mdma_desc_residue(chan, | |
1324 | to_stm32_mdma_desc(vdesc), 0); | |
1325 | dma_set_residue(state, residue); | |
1326 | ||
1327 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
1328 | ||
1329 | return status; | |
1330 | } | |
1331 | ||
1332 | static void stm32_mdma_xfer_end(struct stm32_mdma_chan *chan) | |
1333 | { | |
1334 | list_del(&chan->desc->vdesc.node); | |
1335 | vchan_cookie_complete(&chan->desc->vdesc); | |
1336 | chan->desc = NULL; | |
1337 | chan->busy = false; | |
1338 | ||
1339 | /* Start the next transfer if this driver has a next desc */ | |
1340 | stm32_mdma_start_transfer(chan); | |
1341 | } | |
1342 | ||
1343 | static irqreturn_t stm32_mdma_irq_handler(int irq, void *devid) | |
1344 | { | |
1345 | struct stm32_mdma_device *dmadev = devid; | |
1346 | struct stm32_mdma_chan *chan = devid; | |
1347 | u32 reg, id, ien, status, flag; | |
1348 | ||
1349 | /* Find out which channel generates the interrupt */ | |
1350 | status = readl_relaxed(dmadev->base + STM32_MDMA_GISR0); | |
1351 | if (status) { | |
1352 | id = __ffs(status); | |
1353 | } else { | |
1354 | status = readl_relaxed(dmadev->base + STM32_MDMA_GISR1); | |
1355 | if (!status) { | |
1356 | dev_dbg(mdma2dev(dmadev), "spurious it\n"); | |
1357 | return IRQ_NONE; | |
1358 | } | |
1359 | id = __ffs(status); | |
1360 | /* | |
1361 | * As GISR0 provides status for channel id from 0 to 31, | |
1362 | * so GISR1 provides status for channel id from 32 to 62 | |
1363 | */ | |
1364 | id += 32; | |
1365 | } | |
1366 | ||
1367 | chan = &dmadev->chan[id]; | |
1368 | if (!chan) { | |
1369 | dev_err(chan2dev(chan), "MDMA channel not initialized\n"); | |
1370 | goto exit; | |
1371 | } | |
1372 | ||
1373 | /* Handle interrupt for the channel */ | |
1374 | spin_lock(&chan->vchan.lock); | |
1375 | status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id)); | |
1376 | ien = stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)); | |
1377 | ien &= STM32_MDMA_CCR_IRQ_MASK; | |
1378 | ien >>= 1; | |
1379 | ||
1380 | if (!(status & ien)) { | |
1381 | spin_unlock(&chan->vchan.lock); | |
1382 | dev_dbg(chan2dev(chan), | |
1383 | "spurious it (status=0x%04x, ien=0x%04x)\n", | |
1384 | status, ien); | |
1385 | return IRQ_NONE; | |
1386 | } | |
1387 | ||
1388 | flag = __ffs(status & ien); | |
1389 | reg = STM32_MDMA_CIFCR(chan->id); | |
1390 | ||
1391 | switch (1 << flag) { | |
1392 | case STM32_MDMA_CISR_TEIF: | |
1393 | id = chan->id; | |
1394 | status = readl_relaxed(dmadev->base + STM32_MDMA_CESR(id)); | |
1395 | dev_err(chan2dev(chan), "Transfer Err: stat=0x%08x\n", status); | |
1396 | stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CTEIF); | |
1397 | break; | |
1398 | ||
1399 | case STM32_MDMA_CISR_CTCIF: | |
1400 | stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CCTCIF); | |
1401 | stm32_mdma_xfer_end(chan); | |
1402 | break; | |
1403 | ||
1404 | case STM32_MDMA_CISR_BRTIF: | |
1405 | stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CBRTIF); | |
1406 | break; | |
1407 | ||
1408 | case STM32_MDMA_CISR_BTIF: | |
1409 | stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CBTIF); | |
1410 | chan->curr_hwdesc++; | |
1411 | if (chan->desc && chan->desc->cyclic) { | |
1412 | if (chan->curr_hwdesc == chan->desc->count) | |
1413 | chan->curr_hwdesc = 0; | |
1414 | vchan_cyclic_callback(&chan->desc->vdesc); | |
1415 | } | |
1416 | break; | |
1417 | ||
1418 | case STM32_MDMA_CISR_TCIF: | |
1419 | stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CLTCIF); | |
1420 | break; | |
1421 | ||
1422 | default: | |
1423 | dev_err(chan2dev(chan), "it %d unhandled (status=0x%04x)\n", | |
1424 | 1 << flag, status); | |
1425 | } | |
1426 | ||
1427 | spin_unlock(&chan->vchan.lock); | |
1428 | ||
1429 | exit: | |
1430 | return IRQ_HANDLED; | |
1431 | } | |
1432 | ||
1433 | static int stm32_mdma_alloc_chan_resources(struct dma_chan *c) | |
1434 | { | |
1435 | struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c); | |
1436 | struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan); | |
1437 | int ret; | |
1438 | ||
1439 | chan->desc_pool = dmam_pool_create(dev_name(&c->dev->device), | |
1440 | c->device->dev, | |
1441 | sizeof(struct stm32_mdma_hwdesc), | |
1442 | __alignof__(struct stm32_mdma_hwdesc), | |
1443 | 0); | |
1444 | if (!chan->desc_pool) { | |
1445 | dev_err(chan2dev(chan), "failed to allocate descriptor pool\n"); | |
1446 | return -ENOMEM; | |
1447 | } | |
1448 | ||
89e987e3 PYM |
1449 | ret = pm_runtime_get_sync(dmadev->ddev.dev); |
1450 | if (ret < 0) | |
a4ffb13c | 1451 | return ret; |
a4ffb13c PYM |
1452 | |
1453 | ret = stm32_mdma_disable_chan(chan); | |
1454 | if (ret < 0) | |
89e987e3 | 1455 | pm_runtime_put(dmadev->ddev.dev); |
a4ffb13c PYM |
1456 | |
1457 | return ret; | |
1458 | } | |
1459 | ||
1460 | static void stm32_mdma_free_chan_resources(struct dma_chan *c) | |
1461 | { | |
1462 | struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c); | |
1463 | struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan); | |
1464 | unsigned long flags; | |
1465 | ||
1466 | dev_dbg(chan2dev(chan), "Freeing channel %d\n", chan->id); | |
1467 | ||
1468 | if (chan->busy) { | |
1469 | spin_lock_irqsave(&chan->vchan.lock, flags); | |
1470 | stm32_mdma_stop(chan); | |
1471 | chan->desc = NULL; | |
1472 | spin_unlock_irqrestore(&chan->vchan.lock, flags); | |
1473 | } | |
1474 | ||
89e987e3 | 1475 | pm_runtime_put(dmadev->ddev.dev); |
a4ffb13c PYM |
1476 | vchan_free_chan_resources(to_virt_chan(c)); |
1477 | dmam_pool_destroy(chan->desc_pool); | |
1478 | chan->desc_pool = NULL; | |
1479 | } | |
1480 | ||
1481 | static struct dma_chan *stm32_mdma_of_xlate(struct of_phandle_args *dma_spec, | |
1482 | struct of_dma *ofdma) | |
1483 | { | |
1484 | struct stm32_mdma_device *dmadev = ofdma->of_dma_data; | |
1485 | struct stm32_mdma_chan *chan; | |
1486 | struct dma_chan *c; | |
1487 | struct stm32_mdma_chan_config config; | |
1488 | ||
1489 | if (dma_spec->args_count < 5) { | |
1490 | dev_err(mdma2dev(dmadev), "Bad number of args\n"); | |
1491 | return NULL; | |
1492 | } | |
1493 | ||
1494 | config.request = dma_spec->args[0]; | |
1495 | config.priority_level = dma_spec->args[1]; | |
1496 | config.transfer_config = dma_spec->args[2]; | |
1497 | config.mask_addr = dma_spec->args[3]; | |
1498 | config.mask_data = dma_spec->args[4]; | |
1499 | ||
1500 | if (config.request >= dmadev->nr_requests) { | |
1501 | dev_err(mdma2dev(dmadev), "Bad request line\n"); | |
1502 | return NULL; | |
1503 | } | |
1504 | ||
1505 | if (config.priority_level > STM32_MDMA_VERY_HIGH_PRIORITY) { | |
1506 | dev_err(mdma2dev(dmadev), "Priority level not supported\n"); | |
1507 | return NULL; | |
1508 | } | |
1509 | ||
1510 | c = dma_get_any_slave_channel(&dmadev->ddev); | |
1511 | if (!c) { | |
d317d32b | 1512 | dev_err(mdma2dev(dmadev), "No more channels available\n"); |
a4ffb13c PYM |
1513 | return NULL; |
1514 | } | |
1515 | ||
1516 | chan = to_stm32_mdma_chan(c); | |
1517 | chan->chan_config = config; | |
1518 | ||
1519 | return c; | |
1520 | } | |
1521 | ||
1522 | static const struct of_device_id stm32_mdma_of_match[] = { | |
1523 | { .compatible = "st,stm32h7-mdma", }, | |
1524 | { /* sentinel */ }, | |
1525 | }; | |
1526 | MODULE_DEVICE_TABLE(of, stm32_mdma_of_match); | |
1527 | ||
1528 | static int stm32_mdma_probe(struct platform_device *pdev) | |
1529 | { | |
1530 | struct stm32_mdma_chan *chan; | |
1531 | struct stm32_mdma_device *dmadev; | |
1532 | struct dma_device *dd; | |
1533 | struct device_node *of_node; | |
1534 | struct resource *res; | |
1535 | u32 nr_channels, nr_requests; | |
1536 | int i, count, ret; | |
1537 | ||
1538 | of_node = pdev->dev.of_node; | |
1539 | if (!of_node) | |
1540 | return -ENODEV; | |
1541 | ||
1542 | ret = device_property_read_u32(&pdev->dev, "dma-channels", | |
1543 | &nr_channels); | |
1544 | if (ret) { | |
1545 | nr_channels = STM32_MDMA_MAX_CHANNELS; | |
1546 | dev_warn(&pdev->dev, "MDMA defaulting on %i channels\n", | |
1547 | nr_channels); | |
1548 | } | |
1549 | ||
1550 | ret = device_property_read_u32(&pdev->dev, "dma-requests", | |
1551 | &nr_requests); | |
1552 | if (ret) { | |
1553 | nr_requests = STM32_MDMA_MAX_REQUESTS; | |
1554 | dev_warn(&pdev->dev, "MDMA defaulting on %i request lines\n", | |
1555 | nr_requests); | |
1556 | } | |
1557 | ||
1558 | count = device_property_read_u32_array(&pdev->dev, "st,ahb-addr-masks", | |
1559 | NULL, 0); | |
1560 | if (count < 0) | |
1561 | count = 0; | |
1562 | ||
1563 | dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev) + sizeof(u32) * count, | |
1564 | GFP_KERNEL); | |
1565 | if (!dmadev) | |
1566 | return -ENOMEM; | |
1567 | ||
1568 | dmadev->nr_channels = nr_channels; | |
1569 | dmadev->nr_requests = nr_requests; | |
9dfec7ca | 1570 | device_property_read_u32_array(&pdev->dev, "st,ahb-addr-masks", |
a4ffb13c PYM |
1571 | dmadev->ahb_addr_masks, |
1572 | count); | |
1573 | dmadev->nr_ahb_addr_masks = count; | |
1574 | ||
1575 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1576 | dmadev->base = devm_ioremap_resource(&pdev->dev, res); | |
1577 | if (IS_ERR(dmadev->base)) | |
1578 | return PTR_ERR(dmadev->base); | |
1579 | ||
1580 | dmadev->clk = devm_clk_get(&pdev->dev, NULL); | |
1581 | if (IS_ERR(dmadev->clk)) { | |
1582 | ret = PTR_ERR(dmadev->clk); | |
1583 | if (ret == -EPROBE_DEFER) | |
1584 | dev_info(&pdev->dev, "Missing controller clock\n"); | |
1585 | return ret; | |
1586 | } | |
1587 | ||
89e987e3 PYM |
1588 | ret = clk_prepare_enable(dmadev->clk); |
1589 | if (ret < 0) { | |
1590 | dev_err(&pdev->dev, "clk_prep_enable error: %d\n", ret); | |
1591 | return ret; | |
1592 | } | |
1593 | ||
a4ffb13c PYM |
1594 | dmadev->rst = devm_reset_control_get(&pdev->dev, NULL); |
1595 | if (!IS_ERR(dmadev->rst)) { | |
1596 | reset_control_assert(dmadev->rst); | |
1597 | udelay(2); | |
1598 | reset_control_deassert(dmadev->rst); | |
1599 | } | |
1600 | ||
1601 | dd = &dmadev->ddev; | |
1602 | dma_cap_set(DMA_SLAVE, dd->cap_mask); | |
1603 | dma_cap_set(DMA_PRIVATE, dd->cap_mask); | |
1604 | dma_cap_set(DMA_CYCLIC, dd->cap_mask); | |
1605 | dma_cap_set(DMA_MEMCPY, dd->cap_mask); | |
1606 | dd->device_alloc_chan_resources = stm32_mdma_alloc_chan_resources; | |
1607 | dd->device_free_chan_resources = stm32_mdma_free_chan_resources; | |
1608 | dd->device_tx_status = stm32_mdma_tx_status; | |
1609 | dd->device_issue_pending = stm32_mdma_issue_pending; | |
1610 | dd->device_prep_slave_sg = stm32_mdma_prep_slave_sg; | |
1611 | dd->device_prep_dma_cyclic = stm32_mdma_prep_dma_cyclic; | |
1612 | dd->device_prep_dma_memcpy = stm32_mdma_prep_dma_memcpy; | |
1613 | dd->device_config = stm32_mdma_slave_config; | |
1614 | dd->device_pause = stm32_mdma_pause; | |
1615 | dd->device_resume = stm32_mdma_resume; | |
1616 | dd->device_terminate_all = stm32_mdma_terminate_all; | |
1617 | dd->device_synchronize = stm32_mdma_synchronize; | |
1618 | dd->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | | |
1619 | BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | | |
1620 | BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | | |
1621 | BIT(DMA_SLAVE_BUSWIDTH_8_BYTES); | |
1622 | dd->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | | |
1623 | BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | | |
1624 | BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | | |
1625 | BIT(DMA_SLAVE_BUSWIDTH_8_BYTES); | |
1626 | dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) | | |
1627 | BIT(DMA_MEM_TO_MEM); | |
1628 | dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; | |
1629 | dd->max_burst = STM32_MDMA_MAX_BURST; | |
1630 | dd->dev = &pdev->dev; | |
1631 | INIT_LIST_HEAD(&dd->channels); | |
1632 | ||
1633 | for (i = 0; i < dmadev->nr_channels; i++) { | |
1634 | chan = &dmadev->chan[i]; | |
1635 | chan->id = i; | |
1636 | chan->vchan.desc_free = stm32_mdma_desc_free; | |
1637 | vchan_init(&chan->vchan, dd); | |
1638 | } | |
1639 | ||
1640 | dmadev->irq = platform_get_irq(pdev, 0); | |
1641 | if (dmadev->irq < 0) { | |
1642 | dev_err(&pdev->dev, "failed to get IRQ\n"); | |
1643 | return dmadev->irq; | |
1644 | } | |
1645 | ||
1646 | ret = devm_request_irq(&pdev->dev, dmadev->irq, stm32_mdma_irq_handler, | |
1647 | 0, dev_name(&pdev->dev), dmadev); | |
1648 | if (ret) { | |
1649 | dev_err(&pdev->dev, "failed to request IRQ\n"); | |
1650 | return ret; | |
1651 | } | |
1652 | ||
42f604b6 | 1653 | ret = dmaenginem_async_device_register(dd); |
a4ffb13c PYM |
1654 | if (ret) |
1655 | return ret; | |
1656 | ||
1657 | ret = of_dma_controller_register(of_node, stm32_mdma_of_xlate, dmadev); | |
1658 | if (ret < 0) { | |
1659 | dev_err(&pdev->dev, | |
1660 | "STM32 MDMA DMA OF registration failed %d\n", ret); | |
1661 | goto err_unregister; | |
1662 | } | |
1663 | ||
1664 | platform_set_drvdata(pdev, dmadev); | |
89e987e3 PYM |
1665 | pm_runtime_set_active(&pdev->dev); |
1666 | pm_runtime_enable(&pdev->dev); | |
1667 | pm_runtime_get_noresume(&pdev->dev); | |
1668 | pm_runtime_put(&pdev->dev); | |
a4ffb13c PYM |
1669 | |
1670 | dev_info(&pdev->dev, "STM32 MDMA driver registered\n"); | |
1671 | ||
1672 | return 0; | |
1673 | ||
1674 | err_unregister: | |
a4ffb13c PYM |
1675 | return ret; |
1676 | } | |
1677 | ||
89e987e3 PYM |
1678 | #ifdef CONFIG_PM |
1679 | static int stm32_mdma_runtime_suspend(struct device *dev) | |
1680 | { | |
1681 | struct stm32_mdma_device *dmadev = dev_get_drvdata(dev); | |
1682 | ||
1683 | clk_disable_unprepare(dmadev->clk); | |
1684 | ||
1685 | return 0; | |
1686 | } | |
1687 | ||
1688 | static int stm32_mdma_runtime_resume(struct device *dev) | |
1689 | { | |
1690 | struct stm32_mdma_device *dmadev = dev_get_drvdata(dev); | |
1691 | int ret; | |
1692 | ||
1693 | ret = clk_prepare_enable(dmadev->clk); | |
1694 | if (ret) { | |
1695 | dev_err(dev, "failed to prepare_enable clock\n"); | |
1696 | return ret; | |
1697 | } | |
1698 | ||
1699 | return 0; | |
1700 | } | |
1701 | #endif | |
1702 | ||
1703 | static const struct dev_pm_ops stm32_mdma_pm_ops = { | |
1704 | SET_RUNTIME_PM_OPS(stm32_mdma_runtime_suspend, | |
1705 | stm32_mdma_runtime_resume, NULL) | |
1706 | }; | |
1707 | ||
a4ffb13c PYM |
1708 | static struct platform_driver stm32_mdma_driver = { |
1709 | .probe = stm32_mdma_probe, | |
1710 | .driver = { | |
1711 | .name = "stm32-mdma", | |
1712 | .of_match_table = stm32_mdma_of_match, | |
89e987e3 | 1713 | .pm = &stm32_mdma_pm_ops, |
a4ffb13c PYM |
1714 | }, |
1715 | }; | |
1716 | ||
1717 | static int __init stm32_mdma_init(void) | |
1718 | { | |
1719 | return platform_driver_register(&stm32_mdma_driver); | |
1720 | } | |
1721 | ||
1722 | subsys_initcall(stm32_mdma_init); | |
1723 | ||
1724 | MODULE_DESCRIPTION("Driver for STM32 MDMA controller"); | |
1725 | MODULE_AUTHOR("M'boumba Cedric Madianga <cedric.madianga@gmail.com>"); | |
1726 | MODULE_AUTHOR("Pierre-Yves Mordret <pierre-yves.mordret@st.com>"); | |
1727 | MODULE_LICENSE("GPL v2"); |