1 // SPDX-License-Identifier: GPL-2.0-only
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 *
8 * Driver for STM32 MDMA controller
9 *
10 * Inspired by stm32-dma.c and dma-jz4780.c
11 */
12
13 #include <linux/bitfield.h>
14 #include <linux/clk.h>
15 #include <linux/delay.h>
16 #include <linux/dmaengine.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/dmapool.h>
19 #include <linux/err.h>
20 #include <linux/init.h>
21 #include <linux/iopoll.h>
22 #include <linux/jiffies.h>
23 #include <linux/list.h>
24 #include <linux/log2.h>
25 #include <linux/module.h>
26 #include <linux/of.h>
27 #include <linux/of_dma.h>
28 #include <linux/platform_device.h>
29 #include <linux/pm_runtime.h>
30 #include <linux/reset.h>
31 #include <linux/slab.h>
32
33 #include "../virt-dma.h"
34
35 #define STM32_MDMA_GISR0 0x0000 /* MDMA Int Status Reg 1 */
36
37 /* MDMA Channel x interrupt/status register */
38 #define STM32_MDMA_CISR(x) (0x40 + 0x40 * (x)) /* x = 0..62 */
39 #define STM32_MDMA_CISR_CRQA BIT(16)
40 #define STM32_MDMA_CISR_TCIF BIT(4)
41 #define STM32_MDMA_CISR_BTIF BIT(3)
42 #define STM32_MDMA_CISR_BRTIF BIT(2)
43 #define STM32_MDMA_CISR_CTCIF BIT(1)
44 #define STM32_MDMA_CISR_TEIF BIT(0)
45
46 /* MDMA Channel x interrupt flag clear register */
47 #define STM32_MDMA_CIFCR(x) (0x44 + 0x40 * (x))
48 #define STM32_MDMA_CIFCR_CLTCIF BIT(4)
49 #define STM32_MDMA_CIFCR_CBTIF BIT(3)
50 #define STM32_MDMA_CIFCR_CBRTIF BIT(2)
51 #define STM32_MDMA_CIFCR_CCTCIF BIT(1)
52 #define STM32_MDMA_CIFCR_CTEIF BIT(0)
53 #define STM32_MDMA_CIFCR_CLEAR_ALL (STM32_MDMA_CIFCR_CLTCIF \
54 | STM32_MDMA_CIFCR_CBTIF \
55 | STM32_MDMA_CIFCR_CBRTIF \
56 | STM32_MDMA_CIFCR_CCTCIF \
57 | STM32_MDMA_CIFCR_CTEIF)
58
59 /* MDMA Channel x error status register */
60 #define STM32_MDMA_CESR(x) (0x48 + 0x40 * (x))
61 #define STM32_MDMA_CESR_BSE BIT(11)
62 #define STM32_MDMA_CESR_ASR BIT(10)
63 #define STM32_MDMA_CESR_TEMD BIT(9)
64 #define STM32_MDMA_CESR_TELD BIT(8)
65 #define STM32_MDMA_CESR_TED BIT(7)
66 #define STM32_MDMA_CESR_TEA_MASK GENMASK(6, 0)
67
68 /* MDMA Channel x control register */
69 #define STM32_MDMA_CCR(x) (0x4C + 0x40 * (x))
70 #define STM32_MDMA_CCR_SWRQ BIT(16)
71 #define STM32_MDMA_CCR_WEX BIT(14)
72 #define STM32_MDMA_CCR_HEX BIT(13)
73 #define STM32_MDMA_CCR_BEX BIT(12)
74 #define STM32_MDMA_CCR_SM BIT(8)
75 #define STM32_MDMA_CCR_PL_MASK GENMASK(7, 6)
76 #define STM32_MDMA_CCR_PL(n) FIELD_PREP(STM32_MDMA_CCR_PL_MASK, (n))
77 #define STM32_MDMA_CCR_TCIE BIT(5)
78 #define STM32_MDMA_CCR_BTIE BIT(4)
79 #define STM32_MDMA_CCR_BRTIE BIT(3)
80 #define STM32_MDMA_CCR_CTCIE BIT(2)
81 #define STM32_MDMA_CCR_TEIE BIT(1)
82 #define STM32_MDMA_CCR_EN BIT(0)
83 #define STM32_MDMA_CCR_IRQ_MASK (STM32_MDMA_CCR_TCIE \
84 | STM32_MDMA_CCR_BTIE \
85 | STM32_MDMA_CCR_BRTIE \
86 | STM32_MDMA_CCR_CTCIE \
87 | STM32_MDMA_CCR_TEIE)
88
89 /* MDMA Channel x transfer configuration register */
90 #define STM32_MDMA_CTCR(x) (0x50 + 0x40 * (x))
91 #define STM32_MDMA_CTCR_BWM BIT(31)
92 #define STM32_MDMA_CTCR_SWRM BIT(30)
93 #define STM32_MDMA_CTCR_TRGM_MSK GENMASK(29, 28)
94 #define STM32_MDMA_CTCR_TRGM(n) FIELD_PREP(STM32_MDMA_CTCR_TRGM_MSK, (n))
95 #define STM32_MDMA_CTCR_TRGM_GET(n) FIELD_GET(STM32_MDMA_CTCR_TRGM_MSK, (n))
96 #define STM32_MDMA_CTCR_PAM_MASK GENMASK(27, 26)
97 #define STM32_MDMA_CTCR_PAM(n) FIELD_PREP(STM32_MDMA_CTCR_PAM_MASK, (n))
98 #define STM32_MDMA_CTCR_PKE BIT(25)
99 #define STM32_MDMA_CTCR_TLEN_MSK GENMASK(24, 18)
100 #define STM32_MDMA_CTCR_TLEN(n) FIELD_PREP(STM32_MDMA_CTCR_TLEN_MSK, (n))
101 #define STM32_MDMA_CTCR_TLEN_GET(n) FIELD_GET(STM32_MDMA_CTCR_TLEN_MSK, (n))
102 #define STM32_MDMA_CTCR_LEN2_MSK GENMASK(25, 18)
103 #define STM32_MDMA_CTCR_LEN2(n) FIELD_PREP(STM32_MDMA_CTCR_LEN2_MSK, (n))
104 #define STM32_MDMA_CTCR_LEN2_GET(n) FIELD_GET(STM32_MDMA_CTCR_LEN2_MSK, (n))
105 #define STM32_MDMA_CTCR_DBURST_MASK GENMASK(17, 15)
106 #define STM32_MDMA_CTCR_DBURST(n) FIELD_PREP(STM32_MDMA_CTCR_DBURST_MASK, (n))
107 #define STM32_MDMA_CTCR_SBURST_MASK GENMASK(14, 12)
108 #define STM32_MDMA_CTCR_SBURST(n) FIELD_PREP(STM32_MDMA_CTCR_SBURST_MASK, (n))
109 #define STM32_MDMA_CTCR_DINCOS_MASK GENMASK(11, 10)
110 #define STM32_MDMA_CTCR_DINCOS(n) FIELD_PREP(STM32_MDMA_CTCR_DINCOS_MASK, (n))
111 #define STM32_MDMA_CTCR_SINCOS_MASK GENMASK(9, 8)
112 #define STM32_MDMA_CTCR_SINCOS(n) FIELD_PREP(STM32_MDMA_CTCR_SINCOS_MASK, (n))
113 #define STM32_MDMA_CTCR_DSIZE_MASK GENMASK(7, 6)
114 #define STM32_MDMA_CTCR_DSIZE(n) FIELD_PREP(STM32_MDMA_CTCR_DSIZE_MASK, (n))
115 #define STM32_MDMA_CTCR_SSIZE_MASK GENMASK(5, 4)
116 #define STM32_MDMA_CTCR_SSIZE(n) FIELD_PREP(STM32_MDMA_CTCR_SSIZE_MASK, (n))
117 #define STM32_MDMA_CTCR_DINC_MASK GENMASK(3, 2)
118 #define STM32_MDMA_CTCR_DINC(n) FIELD_PREP(STM32_MDMA_CTCR_DINC_MASK, (n))
119 #define STM32_MDMA_CTCR_SINC_MASK GENMASK(1, 0)
120 #define STM32_MDMA_CTCR_SINC(n) FIELD_PREP(STM32_MDMA_CTCR_SINC_MASK, (n))
121 #define STM32_MDMA_CTCR_CFG_MASK (STM32_MDMA_CTCR_SINC_MASK \
122 | STM32_MDMA_CTCR_DINC_MASK \
123 | STM32_MDMA_CTCR_SINCOS_MASK \
124 | STM32_MDMA_CTCR_DINCOS_MASK \
125 | STM32_MDMA_CTCR_LEN2_MSK \
126 | STM32_MDMA_CTCR_TRGM_MSK)
127
128 /* MDMA Channel x block number of data register */
129 #define STM32_MDMA_CBNDTR(x) (0x54 + 0x40 * (x))
130 #define STM32_MDMA_CBNDTR_BRC_MK GENMASK(31, 20)
131 #define STM32_MDMA_CBNDTR_BRC(n) FIELD_PREP(STM32_MDMA_CBNDTR_BRC_MK, (n))
132 #define STM32_MDMA_CBNDTR_BRC_GET(n) FIELD_GET(STM32_MDMA_CBNDTR_BRC_MK, (n))
133
134 #define STM32_MDMA_CBNDTR_BRDUM BIT(19)
135 #define STM32_MDMA_CBNDTR_BRSUM BIT(18)
136 #define STM32_MDMA_CBNDTR_BNDT_MASK GENMASK(16, 0)
137 #define STM32_MDMA_CBNDTR_BNDT(n) FIELD_PREP(STM32_MDMA_CBNDTR_BNDT_MASK, (n))
138
139 /* MDMA Channel x source address register */
140 #define STM32_MDMA_CSAR(x) (0x58 + 0x40 * (x))
141
142 /* MDMA Channel x destination address register */
143 #define STM32_MDMA_CDAR(x) (0x5C + 0x40 * (x))
144
145 /* MDMA Channel x block repeat address update register */
146 #define STM32_MDMA_CBRUR(x) (0x60 + 0x40 * (x))
147 #define STM32_MDMA_CBRUR_DUV_MASK GENMASK(31, 16)
148 #define STM32_MDMA_CBRUR_DUV(n) FIELD_PREP(STM32_MDMA_CBRUR_DUV_MASK, (n))
149 #define STM32_MDMA_CBRUR_SUV_MASK GENMASK(15, 0)
150 #define STM32_MDMA_CBRUR_SUV(n) FIELD_PREP(STM32_MDMA_CBRUR_SUV_MASK, (n))
151
152 /* MDMA Channel x link address register */
153 #define STM32_MDMA_CLAR(x) (0x64 + 0x40 * (x))
154
155 /* MDMA Channel x trigger and bus selection register */
156 #define STM32_MDMA_CTBR(x) (0x68 + 0x40 * (x))
157 #define STM32_MDMA_CTBR_DBUS BIT(17)
158 #define STM32_MDMA_CTBR_SBUS BIT(16)
159 #define STM32_MDMA_CTBR_TSEL_MASK GENMASK(5, 0)
160 #define STM32_MDMA_CTBR_TSEL(n) FIELD_PREP(STM32_MDMA_CTBR_TSEL_MASK, (n))
161
162 /* MDMA Channel x mask address register */
163 #define STM32_MDMA_CMAR(x) (0x70 + 0x40 * (x))
164
165 /* MDMA Channel x mask data register */
166 #define STM32_MDMA_CMDR(x) (0x74 + 0x40 * (x))
167
168 #define STM32_MDMA_MAX_BUF_LEN 128
169 #define STM32_MDMA_MAX_BLOCK_LEN 65536
170 #define STM32_MDMA_MAX_CHANNELS 32
171 #define STM32_MDMA_MAX_REQUESTS 256
172 #define STM32_MDMA_MAX_BURST 128
173 #define STM32_MDMA_VERY_HIGH_PRIORITY 0x3
174
175 enum stm32_mdma_trigger_mode {
176 STM32_MDMA_BUFFER,
177 STM32_MDMA_BLOCK,
178 STM32_MDMA_BLOCK_REP,
179 STM32_MDMA_LINKED_LIST,
180 };
181
182 enum stm32_mdma_width {
183 STM32_MDMA_BYTE,
184 STM32_MDMA_HALF_WORD,
185 STM32_MDMA_WORD,
186 STM32_MDMA_DOUBLE_WORD,
187 };
188
189 enum stm32_mdma_inc_mode {
190 STM32_MDMA_FIXED = 0,
191 STM32_MDMA_INC = 2,
192 STM32_MDMA_DEC = 3,
193 };
194
195 struct stm32_mdma_chan_config {
196 u32 request;
197 u32 priority_level;
198 u32 transfer_config;
199 u32 mask_addr;
200 u32 mask_data;
201 bool m2m_hw; /* True when MDMA is triggered by STM32 DMA */
202 };
203
204 struct stm32_mdma_hwdesc {
205 u32 ctcr;
206 u32 cbndtr;
207 u32 csar;
208 u32 cdar;
209 u32 cbrur;
210 u32 clar;
211 u32 ctbr;
212 u32 dummy;
213 u32 cmar;
214 u32 cmdr;
215 } __aligned(64);
216
217 struct stm32_mdma_desc_node {
218 struct stm32_mdma_hwdesc *hwdesc;
219 dma_addr_t hwdesc_phys;
220 };
221
222 struct stm32_mdma_desc {
223 struct virt_dma_desc vdesc;
224 u32 ccr;
225 bool cyclic;
226 u32 count;
227 struct stm32_mdma_desc_node node[] __counted_by(count);
228 };
229
230 struct stm32_mdma_dma_config {
231 u32 request; /* STM32 DMA channel stream id, triggering MDMA */
232 u32 cmar; /* STM32 DMA interrupt flag clear register address */
233 u32 cmdr; /* STM32 DMA Transfer Complete flag */
234 };
235
236 struct stm32_mdma_chan {
237 struct virt_dma_chan vchan;
238 struct dma_pool *desc_pool;
239 u32 id;
240 struct stm32_mdma_desc *desc;
241 u32 curr_hwdesc;
242 struct dma_slave_config dma_config;
243 struct stm32_mdma_chan_config chan_config;
244 bool busy;
245 u32 mem_burst;
246 u32 mem_width;
247 };
248
249 struct stm32_mdma_device {
250 struct dma_device ddev;
251 void __iomem *base;
252 struct clk *clk;
253 int irq;
254 u32 nr_channels;
255 u32 nr_requests;
256 u32 nr_ahb_addr_masks;
257 u32 chan_reserved;
258 struct stm32_mdma_chan chan[STM32_MDMA_MAX_CHANNELS];
259 u32 ahb_addr_masks[] __counted_by(nr_ahb_addr_masks);
260 };
261
stm32_mdma_get_dev(struct stm32_mdma_chan * chan)262 static struct stm32_mdma_device *stm32_mdma_get_dev(
263 struct stm32_mdma_chan *chan)
264 {
265 return container_of(chan->vchan.chan.device, struct stm32_mdma_device,
266 ddev);
267 }
268
to_stm32_mdma_chan(struct dma_chan * c)269 static struct stm32_mdma_chan *to_stm32_mdma_chan(struct dma_chan *c)
270 {
271 return container_of(c, struct stm32_mdma_chan, vchan.chan);
272 }
273
to_stm32_mdma_desc(struct virt_dma_desc * vdesc)274 static struct stm32_mdma_desc *to_stm32_mdma_desc(struct virt_dma_desc *vdesc)
275 {
276 return container_of(vdesc, struct stm32_mdma_desc, vdesc);
277 }
278
chan2dev(struct stm32_mdma_chan * chan)279 static struct device *chan2dev(struct stm32_mdma_chan *chan)
280 {
281 return &chan->vchan.chan.dev->device;
282 }
283
mdma2dev(struct stm32_mdma_device * mdma_dev)284 static struct device *mdma2dev(struct stm32_mdma_device *mdma_dev)
285 {
286 return mdma_dev->ddev.dev;
287 }
288
stm32_mdma_read(struct stm32_mdma_device * dmadev,u32 reg)289 static u32 stm32_mdma_read(struct stm32_mdma_device *dmadev, u32 reg)
290 {
291 return readl_relaxed(dmadev->base + reg);
292 }
293
stm32_mdma_write(struct stm32_mdma_device * dmadev,u32 reg,u32 val)294 static void stm32_mdma_write(struct stm32_mdma_device *dmadev, u32 reg, u32 val)
295 {
296 writel_relaxed(val, dmadev->base + reg);
297 }
298
stm32_mdma_set_bits(struct stm32_mdma_device * dmadev,u32 reg,u32 mask)299 static void stm32_mdma_set_bits(struct stm32_mdma_device *dmadev, u32 reg,
300 u32 mask)
301 {
302 void __iomem *addr = dmadev->base + reg;
303
304 writel_relaxed(readl_relaxed(addr) | mask, addr);
305 }
306
stm32_mdma_clr_bits(struct stm32_mdma_device * dmadev,u32 reg,u32 mask)307 static void stm32_mdma_clr_bits(struct stm32_mdma_device *dmadev, u32 reg,
308 u32 mask)
309 {
310 void __iomem *addr = dmadev->base + reg;
311
312 writel_relaxed(readl_relaxed(addr) & ~mask, addr);
313 }
314
stm32_mdma_alloc_desc(struct stm32_mdma_chan * chan,u32 count)315 static struct stm32_mdma_desc *stm32_mdma_alloc_desc(
316 struct stm32_mdma_chan *chan, u32 count)
317 {
318 struct stm32_mdma_desc *desc;
319 int i;
320
321 desc = kzalloc(struct_size(desc, node, count), GFP_NOWAIT);
322 if (!desc)
323 return NULL;
324 desc->count = count;
325
326 for (i = 0; i < count; i++) {
327 desc->node[i].hwdesc =
328 dma_pool_alloc(chan->desc_pool, GFP_NOWAIT,
329 &desc->node[i].hwdesc_phys);
330 if (!desc->node[i].hwdesc)
331 goto err;
332 }
333
334 return desc;
335
336 err:
337 dev_err(chan2dev(chan), "Failed to allocate descriptor\n");
338 while (--i >= 0)
339 dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
340 desc->node[i].hwdesc_phys);
341 kfree(desc);
342 return NULL;
343 }
344
stm32_mdma_desc_free(struct virt_dma_desc * vdesc)345 static void stm32_mdma_desc_free(struct virt_dma_desc *vdesc)
346 {
347 struct stm32_mdma_desc *desc = to_stm32_mdma_desc(vdesc);
348 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(vdesc->tx.chan);
349 int i;
350
351 for (i = 0; i < desc->count; i++)
352 dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
353 desc->node[i].hwdesc_phys);
354 kfree(desc);
355 }
356
stm32_mdma_get_width(struct stm32_mdma_chan * chan,enum dma_slave_buswidth width)357 static int stm32_mdma_get_width(struct stm32_mdma_chan *chan,
358 enum dma_slave_buswidth width)
359 {
360 switch (width) {
361 case DMA_SLAVE_BUSWIDTH_1_BYTE:
362 case DMA_SLAVE_BUSWIDTH_2_BYTES:
363 case DMA_SLAVE_BUSWIDTH_4_BYTES:
364 case DMA_SLAVE_BUSWIDTH_8_BYTES:
365 return ffs(width) - 1;
366 default:
367 dev_err(chan2dev(chan), "Dma bus width %i not supported\n",
368 width);
369 return -EINVAL;
370 }
371 }
372
stm32_mdma_get_max_width(dma_addr_t addr,u32 buf_len,u32 tlen)373 static enum dma_slave_buswidth stm32_mdma_get_max_width(dma_addr_t addr,
374 u32 buf_len, u32 tlen)
375 {
376 enum dma_slave_buswidth max_width = DMA_SLAVE_BUSWIDTH_8_BYTES;
377
378 for (max_width = DMA_SLAVE_BUSWIDTH_8_BYTES;
379 max_width > DMA_SLAVE_BUSWIDTH_1_BYTE;
380 max_width >>= 1) {
381 /*
382 * Address and buffer length both have to be aligned on
383 * bus width
384 */
385 if ((((buf_len | addr) & (max_width - 1)) == 0) &&
386 tlen >= max_width)
387 break;
388 }
389
390 return max_width;
391 }
392
stm32_mdma_get_best_burst(u32 buf_len,u32 tlen,u32 max_burst,enum dma_slave_buswidth width)393 static u32 stm32_mdma_get_best_burst(u32 buf_len, u32 tlen, u32 max_burst,
394 enum dma_slave_buswidth width)
395 {
396 u32 best_burst;
397
398 best_burst = min((u32)1 << __ffs(tlen | buf_len),
399 max_burst * width) / width;
400
401 return (best_burst > 0) ? best_burst : 1;
402 }
403
stm32_mdma_disable_chan(struct stm32_mdma_chan * chan)404 static int stm32_mdma_disable_chan(struct stm32_mdma_chan *chan)
405 {
406 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
407 u32 ccr, cisr, id, reg;
408 int ret;
409
410 id = chan->id;
411 reg = STM32_MDMA_CCR(id);
412
413 /* Disable interrupts */
414 stm32_mdma_clr_bits(dmadev, reg, STM32_MDMA_CCR_IRQ_MASK);
415
416 ccr = stm32_mdma_read(dmadev, reg);
417 if (ccr & STM32_MDMA_CCR_EN) {
418 stm32_mdma_clr_bits(dmadev, reg, STM32_MDMA_CCR_EN);
419
420 /* Ensure that any ongoing transfer has been completed */
421 ret = readl_relaxed_poll_timeout_atomic(
422 dmadev->base + STM32_MDMA_CISR(id), cisr,
423 (cisr & STM32_MDMA_CISR_CTCIF), 10, 1000);
424 if (ret) {
425 dev_err(chan2dev(chan), "%s: timeout!\n", __func__);
426 return -EBUSY;
427 }
428 }
429
430 return 0;
431 }
432
stm32_mdma_stop(struct stm32_mdma_chan * chan)433 static void stm32_mdma_stop(struct stm32_mdma_chan *chan)
434 {
435 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
436 u32 status;
437 int ret;
438
439 /* Disable DMA */
440 ret = stm32_mdma_disable_chan(chan);
441 if (ret < 0)
442 return;
443
444 /* Clear interrupt status if it is there */
445 status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id));
446 if (status) {
447 dev_dbg(chan2dev(chan), "%s(): clearing interrupt: 0x%08x\n",
448 __func__, status);
449 stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(chan->id), status);
450 }
451
452 chan->busy = false;
453 }
454
stm32_mdma_set_bus(struct stm32_mdma_device * dmadev,u32 * ctbr,u32 ctbr_mask,u32 src_addr)455 static void stm32_mdma_set_bus(struct stm32_mdma_device *dmadev, u32 *ctbr,
456 u32 ctbr_mask, u32 src_addr)
457 {
458 u32 mask;
459 int i;
460
461 /* Check if memory device is on AHB or AXI */
462 *ctbr &= ~ctbr_mask;
463 mask = src_addr & 0xF0000000;
464 for (i = 0; i < dmadev->nr_ahb_addr_masks; i++) {
465 if (mask == dmadev->ahb_addr_masks[i]) {
466 *ctbr |= ctbr_mask;
467 break;
468 }
469 }
470 }
471
stm32_mdma_set_xfer_param(struct stm32_mdma_chan * chan,enum dma_transfer_direction direction,u32 * mdma_ccr,u32 * mdma_ctcr,u32 * mdma_ctbr,dma_addr_t addr,u32 buf_len)472 static int stm32_mdma_set_xfer_param(struct stm32_mdma_chan *chan,
473 enum dma_transfer_direction direction,
474 u32 *mdma_ccr, u32 *mdma_ctcr,
475 u32 *mdma_ctbr, dma_addr_t addr,
476 u32 buf_len)
477 {
478 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
479 struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
480 enum dma_slave_buswidth src_addr_width, dst_addr_width;
481 phys_addr_t src_addr, dst_addr;
482 int src_bus_width, dst_bus_width;
483 u32 src_maxburst, dst_maxburst, src_best_burst, dst_best_burst;
484 u32 ccr, ctcr, ctbr, tlen;
485
486 src_addr_width = chan->dma_config.src_addr_width;
487 dst_addr_width = chan->dma_config.dst_addr_width;
488 src_maxburst = chan->dma_config.src_maxburst;
489 dst_maxburst = chan->dma_config.dst_maxburst;
490
491 ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)) & ~STM32_MDMA_CCR_EN;
492 ctcr = stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id));
493 ctbr = stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id));
494
495 /* Enable HW request mode */
496 ctcr &= ~STM32_MDMA_CTCR_SWRM;
497
498 /* Set DINC, SINC, DINCOS, SINCOS, TRGM and TLEN retrieve from DT */
499 ctcr &= ~STM32_MDMA_CTCR_CFG_MASK;
500 ctcr |= chan_config->transfer_config & STM32_MDMA_CTCR_CFG_MASK;
501
502 /*
503 * For buffer transfer length (TLEN) we have to set
504 * the number of bytes - 1 in CTCR register
505 */
506 tlen = STM32_MDMA_CTCR_LEN2_GET(ctcr);
507 ctcr &= ~STM32_MDMA_CTCR_LEN2_MSK;
508 ctcr |= STM32_MDMA_CTCR_TLEN((tlen - 1));
509
510 /* Disable Pack Enable */
511 ctcr &= ~STM32_MDMA_CTCR_PKE;
512
513 /* Check burst size constraints */
514 if (src_maxburst * src_addr_width > STM32_MDMA_MAX_BURST ||
515 dst_maxburst * dst_addr_width > STM32_MDMA_MAX_BURST) {
516 dev_err(chan2dev(chan),
517 "burst size * bus width higher than %d bytes\n",
518 STM32_MDMA_MAX_BURST);
519 return -EINVAL;
520 }
521
522 if ((!is_power_of_2(src_maxburst) && src_maxburst > 0) ||
523 (!is_power_of_2(dst_maxburst) && dst_maxburst > 0)) {
524 dev_err(chan2dev(chan), "burst size must be a power of 2\n");
525 return -EINVAL;
526 }
527
528 /*
529 * Configure channel control:
530 * - Clear SW request as in this case this is a HW one
531 * - Clear WEX, HEX and BEX bits
532 * - Set priority level
533 */
534 ccr &= ~(STM32_MDMA_CCR_SWRQ | STM32_MDMA_CCR_WEX | STM32_MDMA_CCR_HEX |
535 STM32_MDMA_CCR_BEX | STM32_MDMA_CCR_PL_MASK);
536 ccr |= STM32_MDMA_CCR_PL(chan_config->priority_level);
537
538 /* Configure Trigger selection */
539 ctbr &= ~STM32_MDMA_CTBR_TSEL_MASK;
540 ctbr |= STM32_MDMA_CTBR_TSEL(chan_config->request);
541
542 switch (direction) {
543 case DMA_MEM_TO_DEV:
544 dst_addr = chan->dma_config.dst_addr;
545
546 /* Set device data size */
547 if (chan_config->m2m_hw)
548 dst_addr_width = stm32_mdma_get_max_width(dst_addr, buf_len,
549 STM32_MDMA_MAX_BUF_LEN);
550 dst_bus_width = stm32_mdma_get_width(chan, dst_addr_width);
551 if (dst_bus_width < 0)
552 return dst_bus_width;
553 ctcr &= ~STM32_MDMA_CTCR_DSIZE_MASK;
554 ctcr |= STM32_MDMA_CTCR_DSIZE(dst_bus_width);
555 if (chan_config->m2m_hw) {
556 ctcr &= ~STM32_MDMA_CTCR_DINCOS_MASK;
557 ctcr |= STM32_MDMA_CTCR_DINCOS(dst_bus_width);
558 }
559
560 /* Set device burst value */
561 if (chan_config->m2m_hw)
562 dst_maxburst = STM32_MDMA_MAX_BUF_LEN / dst_addr_width;
563
564 dst_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
565 dst_maxburst,
566 dst_addr_width);
567 chan->mem_burst = dst_best_burst;
568 ctcr &= ~STM32_MDMA_CTCR_DBURST_MASK;
569 ctcr |= STM32_MDMA_CTCR_DBURST((ilog2(dst_best_burst)));
570
571 /* Set memory data size */
572 src_addr_width = stm32_mdma_get_max_width(addr, buf_len, tlen);
573 chan->mem_width = src_addr_width;
574 src_bus_width = stm32_mdma_get_width(chan, src_addr_width);
575 if (src_bus_width < 0)
576 return src_bus_width;
577 ctcr &= ~STM32_MDMA_CTCR_SSIZE_MASK |
578 STM32_MDMA_CTCR_SINCOS_MASK;
579 ctcr |= STM32_MDMA_CTCR_SSIZE(src_bus_width) |
580 STM32_MDMA_CTCR_SINCOS(src_bus_width);
581
582 /* Set memory burst value */
583 src_maxburst = STM32_MDMA_MAX_BUF_LEN / src_addr_width;
584 src_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
585 src_maxburst,
586 src_addr_width);
587 chan->mem_burst = src_best_burst;
588 ctcr &= ~STM32_MDMA_CTCR_SBURST_MASK;
589 ctcr |= STM32_MDMA_CTCR_SBURST((ilog2(src_best_burst)));
590
591 /* Select bus */
592 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS,
593 dst_addr);
594
595 if (dst_bus_width != src_bus_width)
596 ctcr |= STM32_MDMA_CTCR_PKE;
597
598 /* Set destination address */
599 stm32_mdma_write(dmadev, STM32_MDMA_CDAR(chan->id), dst_addr);
600 break;
601
602 case DMA_DEV_TO_MEM:
603 src_addr = chan->dma_config.src_addr;
604
605 /* Set device data size */
606 if (chan_config->m2m_hw)
607 src_addr_width = stm32_mdma_get_max_width(src_addr, buf_len,
608 STM32_MDMA_MAX_BUF_LEN);
609
610 src_bus_width = stm32_mdma_get_width(chan, src_addr_width);
611 if (src_bus_width < 0)
612 return src_bus_width;
613 ctcr &= ~STM32_MDMA_CTCR_SSIZE_MASK;
614 ctcr |= STM32_MDMA_CTCR_SSIZE(src_bus_width);
615 if (chan_config->m2m_hw) {
616 ctcr &= ~STM32_MDMA_CTCR_SINCOS_MASK;
617 ctcr |= STM32_MDMA_CTCR_SINCOS(src_bus_width);
618 }
619
620 /* Set device burst value */
621 if (chan_config->m2m_hw)
622 src_maxburst = STM32_MDMA_MAX_BUF_LEN / src_addr_width;
623
624 src_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
625 src_maxburst,
626 src_addr_width);
627 ctcr &= ~STM32_MDMA_CTCR_SBURST_MASK;
628 ctcr |= STM32_MDMA_CTCR_SBURST((ilog2(src_best_burst)));
629
630 /* Set memory data size */
631 dst_addr_width = stm32_mdma_get_max_width(addr, buf_len, tlen);
632 chan->mem_width = dst_addr_width;
633 dst_bus_width = stm32_mdma_get_width(chan, dst_addr_width);
634 if (dst_bus_width < 0)
635 return dst_bus_width;
636 ctcr &= ~(STM32_MDMA_CTCR_DSIZE_MASK |
637 STM32_MDMA_CTCR_DINCOS_MASK);
638 ctcr |= STM32_MDMA_CTCR_DSIZE(dst_bus_width) |
639 STM32_MDMA_CTCR_DINCOS(dst_bus_width);
640
641 /* Set memory burst value */
642 dst_maxburst = STM32_MDMA_MAX_BUF_LEN / dst_addr_width;
643 dst_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
644 dst_maxburst,
645 dst_addr_width);
646 ctcr &= ~STM32_MDMA_CTCR_DBURST_MASK;
647 ctcr |= STM32_MDMA_CTCR_DBURST((ilog2(dst_best_burst)));
648
649 /* Select bus */
650 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS,
651 src_addr);
652
653 if (dst_bus_width != src_bus_width)
654 ctcr |= STM32_MDMA_CTCR_PKE;
655
656 /* Set source address */
657 stm32_mdma_write(dmadev, STM32_MDMA_CSAR(chan->id), src_addr);
658 break;
659
660 default:
661 dev_err(chan2dev(chan), "Dma direction is not supported\n");
662 return -EINVAL;
663 }
664
665 *mdma_ccr = ccr;
666 *mdma_ctcr = ctcr;
667 *mdma_ctbr = ctbr;
668
669 return 0;
670 }
671
stm32_mdma_dump_hwdesc(struct stm32_mdma_chan * chan,struct stm32_mdma_desc_node * node)672 static void stm32_mdma_dump_hwdesc(struct stm32_mdma_chan *chan,
673 struct stm32_mdma_desc_node *node)
674 {
675 dev_dbg(chan2dev(chan), "hwdesc: %pad\n", &node->hwdesc_phys);
676 dev_dbg(chan2dev(chan), "CTCR: 0x%08x\n", node->hwdesc->ctcr);
677 dev_dbg(chan2dev(chan), "CBNDTR: 0x%08x\n", node->hwdesc->cbndtr);
678 dev_dbg(chan2dev(chan), "CSAR: 0x%08x\n", node->hwdesc->csar);
679 dev_dbg(chan2dev(chan), "CDAR: 0x%08x\n", node->hwdesc->cdar);
680 dev_dbg(chan2dev(chan), "CBRUR: 0x%08x\n", node->hwdesc->cbrur);
681 dev_dbg(chan2dev(chan), "CLAR: 0x%08x\n", node->hwdesc->clar);
682 dev_dbg(chan2dev(chan), "CTBR: 0x%08x\n", node->hwdesc->ctbr);
683 dev_dbg(chan2dev(chan), "CMAR: 0x%08x\n", node->hwdesc->cmar);
684 dev_dbg(chan2dev(chan), "CMDR: 0x%08x\n\n", node->hwdesc->cmdr);
685 }
686
stm32_mdma_setup_hwdesc(struct stm32_mdma_chan * chan,struct stm32_mdma_desc * desc,enum dma_transfer_direction dir,u32 count,dma_addr_t src_addr,dma_addr_t dst_addr,u32 len,u32 ctcr,u32 ctbr,bool is_last,bool is_first,bool is_cyclic)687 static void stm32_mdma_setup_hwdesc(struct stm32_mdma_chan *chan,
688 struct stm32_mdma_desc *desc,
689 enum dma_transfer_direction dir, u32 count,
690 dma_addr_t src_addr, dma_addr_t dst_addr,
691 u32 len, u32 ctcr, u32 ctbr, bool is_last,
692 bool is_first, bool is_cyclic)
693 {
694 struct stm32_mdma_chan_config *config = &chan->chan_config;
695 struct stm32_mdma_hwdesc *hwdesc;
696 u32 next = count + 1;
697
698 hwdesc = desc->node[count].hwdesc;
699 hwdesc->ctcr = ctcr;
700 hwdesc->cbndtr &= ~(STM32_MDMA_CBNDTR_BRC_MK |
701 STM32_MDMA_CBNDTR_BRDUM |
702 STM32_MDMA_CBNDTR_BRSUM |
703 STM32_MDMA_CBNDTR_BNDT_MASK);
704 hwdesc->cbndtr |= STM32_MDMA_CBNDTR_BNDT(len);
705 hwdesc->csar = src_addr;
706 hwdesc->cdar = dst_addr;
707 hwdesc->cbrur = 0;
708 hwdesc->ctbr = ctbr;
709 hwdesc->cmar = config->mask_addr;
710 hwdesc->cmdr = config->mask_data;
711
712 if (is_last) {
713 if (is_cyclic)
714 hwdesc->clar = desc->node[0].hwdesc_phys;
715 else
716 hwdesc->clar = 0;
717 } else {
718 hwdesc->clar = desc->node[next].hwdesc_phys;
719 }
720
721 stm32_mdma_dump_hwdesc(chan, &desc->node[count]);
722 }
723
stm32_mdma_setup_xfer(struct stm32_mdma_chan * chan,struct stm32_mdma_desc * desc,struct scatterlist * sgl,u32 sg_len,enum dma_transfer_direction direction)724 static int stm32_mdma_setup_xfer(struct stm32_mdma_chan *chan,
725 struct stm32_mdma_desc *desc,
726 struct scatterlist *sgl, u32 sg_len,
727 enum dma_transfer_direction direction)
728 {
729 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
730 struct dma_slave_config *dma_config = &chan->dma_config;
731 struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
732 struct scatterlist *sg;
733 dma_addr_t src_addr, dst_addr;
734 u32 m2m_hw_period, ccr, ctcr, ctbr;
735 int i, ret = 0;
736
737 if (chan_config->m2m_hw)
738 m2m_hw_period = sg_dma_len(sgl);
739
740 for_each_sg(sgl, sg, sg_len, i) {
741 if (sg_dma_len(sg) > STM32_MDMA_MAX_BLOCK_LEN) {
742 dev_err(chan2dev(chan), "Invalid block len\n");
743 return -EINVAL;
744 }
745
746 if (direction == DMA_MEM_TO_DEV) {
747 src_addr = sg_dma_address(sg);
748 dst_addr = dma_config->dst_addr;
749 if (chan_config->m2m_hw && (i & 1))
750 dst_addr += m2m_hw_period;
751 ret = stm32_mdma_set_xfer_param(chan, direction, &ccr,
752 &ctcr, &ctbr, src_addr,
753 sg_dma_len(sg));
754 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS,
755 src_addr);
756 } else {
757 src_addr = dma_config->src_addr;
758 if (chan_config->m2m_hw && (i & 1))
759 src_addr += m2m_hw_period;
760 dst_addr = sg_dma_address(sg);
761 ret = stm32_mdma_set_xfer_param(chan, direction, &ccr,
762 &ctcr, &ctbr, dst_addr,
763 sg_dma_len(sg));
764 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS,
765 dst_addr);
766 }
767
768 if (ret < 0)
769 return ret;
770
771 stm32_mdma_setup_hwdesc(chan, desc, direction, i, src_addr,
772 dst_addr, sg_dma_len(sg), ctcr, ctbr,
773 i == sg_len - 1, i == 0, false);
774 }
775
776 /* Enable interrupts */
777 ccr &= ~STM32_MDMA_CCR_IRQ_MASK;
778 ccr |= STM32_MDMA_CCR_TEIE | STM32_MDMA_CCR_CTCIE;
779 desc->ccr = ccr;
780
781 return 0;
782 }
783
784 static struct dma_async_tx_descriptor *
stm32_mdma_prep_slave_sg(struct dma_chan * c,struct scatterlist * sgl,u32 sg_len,enum dma_transfer_direction direction,unsigned long flags,void * context)785 stm32_mdma_prep_slave_sg(struct dma_chan *c, struct scatterlist *sgl,
786 u32 sg_len, enum dma_transfer_direction direction,
787 unsigned long flags, void *context)
788 {
789 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
790 struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
791 struct stm32_mdma_desc *desc;
792 int i, ret;
793
794 /*
795 * Once DMA is in setup cyclic mode the channel we cannot assign this
796 * channel anymore. The DMA channel needs to be aborted or terminated
797 * for allowing another request.
798 */
799 if (chan->desc && chan->desc->cyclic) {
800 dev_err(chan2dev(chan),
801 "Request not allowed when dma in cyclic mode\n");
802 return NULL;
803 }
804
805 desc = stm32_mdma_alloc_desc(chan, sg_len);
806 if (!desc)
807 return NULL;
808
809 ret = stm32_mdma_setup_xfer(chan, desc, sgl, sg_len, direction);
810 if (ret < 0)
811 goto xfer_setup_err;
812
813 /*
814 * In case of M2M HW transfer triggered by STM32 DMA, we do not have to clear the
815 * transfer complete flag by hardware in order to let the CPU rearm the STM32 DMA
816 * with the next sg element and update some data in dmaengine framework.
817 */
818 if (chan_config->m2m_hw && direction == DMA_MEM_TO_DEV) {
819 struct stm32_mdma_hwdesc *hwdesc;
820
821 for (i = 0; i < sg_len; i++) {
822 hwdesc = desc->node[i].hwdesc;
823 hwdesc->cmar = 0;
824 hwdesc->cmdr = 0;
825 }
826 }
827
828 desc->cyclic = false;
829
830 return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
831
832 xfer_setup_err:
833 for (i = 0; i < desc->count; i++)
834 dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
835 desc->node[i].hwdesc_phys);
836 kfree(desc);
837 return NULL;
838 }
839
840 static struct dma_async_tx_descriptor *
stm32_mdma_prep_dma_cyclic(struct dma_chan * c,dma_addr_t buf_addr,size_t buf_len,size_t period_len,enum dma_transfer_direction direction,unsigned long flags)841 stm32_mdma_prep_dma_cyclic(struct dma_chan *c, dma_addr_t buf_addr,
842 size_t buf_len, size_t period_len,
843 enum dma_transfer_direction direction,
844 unsigned long flags)
845 {
846 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
847 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
848 struct dma_slave_config *dma_config = &chan->dma_config;
849 struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
850 struct stm32_mdma_desc *desc;
851 dma_addr_t src_addr, dst_addr;
852 u32 ccr, ctcr, ctbr, count;
853 int i, ret;
854
855 /*
856 * Once DMA is in setup cyclic mode the channel we cannot assign this
857 * channel anymore. The DMA channel needs to be aborted or terminated
858 * for allowing another request.
859 */
860 if (chan->desc && chan->desc->cyclic) {
861 dev_err(chan2dev(chan),
862 "Request not allowed when dma in cyclic mode\n");
863 return NULL;
864 }
865
866 if (!buf_len || !period_len || period_len > STM32_MDMA_MAX_BLOCK_LEN) {
867 dev_err(chan2dev(chan), "Invalid buffer/period len\n");
868 return NULL;
869 }
870
871 if (buf_len % period_len) {
872 dev_err(chan2dev(chan), "buf_len not multiple of period_len\n");
873 return NULL;
874 }
875
876 count = buf_len / period_len;
877
878 desc = stm32_mdma_alloc_desc(chan, count);
879 if (!desc)
880 return NULL;
881
882 /* Select bus */
883 if (direction == DMA_MEM_TO_DEV) {
884 src_addr = buf_addr;
885 ret = stm32_mdma_set_xfer_param(chan, direction, &ccr, &ctcr,
886 &ctbr, src_addr, period_len);
887 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS,
888 src_addr);
889 } else {
890 dst_addr = buf_addr;
891 ret = stm32_mdma_set_xfer_param(chan, direction, &ccr, &ctcr,
892 &ctbr, dst_addr, period_len);
893 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS,
894 dst_addr);
895 }
896
897 if (ret < 0)
898 goto xfer_setup_err;
899
900 /* Enable interrupts */
901 ccr &= ~STM32_MDMA_CCR_IRQ_MASK;
902 ccr |= STM32_MDMA_CCR_TEIE | STM32_MDMA_CCR_CTCIE | STM32_MDMA_CCR_BTIE;
903 desc->ccr = ccr;
904
905 /* Configure hwdesc list */
906 for (i = 0; i < count; i++) {
907 if (direction == DMA_MEM_TO_DEV) {
908 src_addr = buf_addr + i * period_len;
909 dst_addr = dma_config->dst_addr;
910 if (chan_config->m2m_hw && (i & 1))
911 dst_addr += period_len;
912 } else {
913 src_addr = dma_config->src_addr;
914 if (chan_config->m2m_hw && (i & 1))
915 src_addr += period_len;
916 dst_addr = buf_addr + i * period_len;
917 }
918
919 stm32_mdma_setup_hwdesc(chan, desc, direction, i, src_addr,
920 dst_addr, period_len, ctcr, ctbr,
921 i == count - 1, i == 0, true);
922 }
923
924 desc->cyclic = true;
925
926 return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
927
928 xfer_setup_err:
929 for (i = 0; i < desc->count; i++)
930 dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
931 desc->node[i].hwdesc_phys);
932 kfree(desc);
933 return NULL;
934 }
935
936 static struct dma_async_tx_descriptor *
stm32_mdma_prep_dma_memcpy(struct dma_chan * c,dma_addr_t dest,dma_addr_t src,size_t len,unsigned long flags)937 stm32_mdma_prep_dma_memcpy(struct dma_chan *c, dma_addr_t dest, dma_addr_t src,
938 size_t len, unsigned long flags)
939 {
940 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
941 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
942 enum dma_slave_buswidth max_width;
943 struct stm32_mdma_desc *desc;
944 struct stm32_mdma_hwdesc *hwdesc;
945 u32 ccr, ctcr, ctbr, cbndtr, count, max_burst, mdma_burst;
946 u32 best_burst, tlen;
947 size_t xfer_count, offset;
948 int src_bus_width, dst_bus_width;
949 int i;
950
951 /*
952 * Once DMA is in setup cyclic mode the channel we cannot assign this
953 * channel anymore. The DMA channel needs to be aborted or terminated
954 * to allow another request
955 */
956 if (chan->desc && chan->desc->cyclic) {
957 dev_err(chan2dev(chan),
958 "Request not allowed when dma in cyclic mode\n");
959 return NULL;
960 }
961
962 count = DIV_ROUND_UP(len, STM32_MDMA_MAX_BLOCK_LEN);
963 desc = stm32_mdma_alloc_desc(chan, count);
964 if (!desc)
965 return NULL;
966
967 ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)) & ~STM32_MDMA_CCR_EN;
968 ctcr = stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id));
969 ctbr = stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id));
970 cbndtr = stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id));
971
972 /* Enable sw req, some interrupts and clear other bits */
973 ccr &= ~(STM32_MDMA_CCR_WEX | STM32_MDMA_CCR_HEX |
974 STM32_MDMA_CCR_BEX | STM32_MDMA_CCR_PL_MASK |
975 STM32_MDMA_CCR_IRQ_MASK);
976 ccr |= STM32_MDMA_CCR_TEIE;
977
978 /* Enable SW request mode, dest/src inc and clear other bits */
979 ctcr &= ~(STM32_MDMA_CTCR_BWM | STM32_MDMA_CTCR_TRGM_MSK |
980 STM32_MDMA_CTCR_PAM_MASK | STM32_MDMA_CTCR_PKE |
981 STM32_MDMA_CTCR_TLEN_MSK | STM32_MDMA_CTCR_DBURST_MASK |
982 STM32_MDMA_CTCR_SBURST_MASK | STM32_MDMA_CTCR_DINCOS_MASK |
983 STM32_MDMA_CTCR_SINCOS_MASK | STM32_MDMA_CTCR_DSIZE_MASK |
984 STM32_MDMA_CTCR_SSIZE_MASK | STM32_MDMA_CTCR_DINC_MASK |
985 STM32_MDMA_CTCR_SINC_MASK);
986 ctcr |= STM32_MDMA_CTCR_SWRM | STM32_MDMA_CTCR_SINC(STM32_MDMA_INC) |
987 STM32_MDMA_CTCR_DINC(STM32_MDMA_INC);
988
989 /* Reset HW request */
990 ctbr &= ~STM32_MDMA_CTBR_TSEL_MASK;
991
992 /* Select bus */
993 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS, src);
994 stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS, dest);
995
996 /* Clear CBNDTR registers */
997 cbndtr &= ~(STM32_MDMA_CBNDTR_BRC_MK | STM32_MDMA_CBNDTR_BRDUM |
998 STM32_MDMA_CBNDTR_BRSUM | STM32_MDMA_CBNDTR_BNDT_MASK);
999
1000 if (len <= STM32_MDMA_MAX_BLOCK_LEN) {
1001 cbndtr |= STM32_MDMA_CBNDTR_BNDT(len);
1002 if (len <= STM32_MDMA_MAX_BUF_LEN) {
1003 /* Setup a buffer transfer */
1004 ccr |= STM32_MDMA_CCR_TCIE | STM32_MDMA_CCR_CTCIE;
1005 ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_BUFFER);
1006 } else {
1007 /* Setup a block transfer */
1008 ccr |= STM32_MDMA_CCR_BTIE | STM32_MDMA_CCR_CTCIE;
1009 ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_BLOCK);
1010 }
1011
1012 tlen = STM32_MDMA_MAX_BUF_LEN;
1013 ctcr |= STM32_MDMA_CTCR_TLEN((tlen - 1));
1014
1015 /* Set source best burst size */
1016 max_width = stm32_mdma_get_max_width(src, len, tlen);
1017 src_bus_width = stm32_mdma_get_width(chan, max_width);
1018
1019 max_burst = tlen / max_width;
1020 best_burst = stm32_mdma_get_best_burst(len, tlen, max_burst,
1021 max_width);
1022 mdma_burst = ilog2(best_burst);
1023
1024 ctcr |= STM32_MDMA_CTCR_SBURST(mdma_burst) |
1025 STM32_MDMA_CTCR_SSIZE(src_bus_width) |
1026 STM32_MDMA_CTCR_SINCOS(src_bus_width);
1027
1028 /* Set destination best burst size */
1029 max_width = stm32_mdma_get_max_width(dest, len, tlen);
1030 dst_bus_width = stm32_mdma_get_width(chan, max_width);
1031
1032 max_burst = tlen / max_width;
1033 best_burst = stm32_mdma_get_best_burst(len, tlen, max_burst,
1034 max_width);
1035 mdma_burst = ilog2(best_burst);
1036
1037 ctcr |= STM32_MDMA_CTCR_DBURST(mdma_burst) |
1038 STM32_MDMA_CTCR_DSIZE(dst_bus_width) |
1039 STM32_MDMA_CTCR_DINCOS(dst_bus_width);
1040
1041 if (dst_bus_width != src_bus_width)
1042 ctcr |= STM32_MDMA_CTCR_PKE;
1043
1044 /* Prepare hardware descriptor */
1045 hwdesc = desc->node[0].hwdesc;
1046 hwdesc->ctcr = ctcr;
1047 hwdesc->cbndtr = cbndtr;
1048 hwdesc->csar = src;
1049 hwdesc->cdar = dest;
1050 hwdesc->cbrur = 0;
1051 hwdesc->clar = 0;
1052 hwdesc->ctbr = ctbr;
1053 hwdesc->cmar = 0;
1054 hwdesc->cmdr = 0;
1055
1056 stm32_mdma_dump_hwdesc(chan, &desc->node[0]);
1057 } else {
1058 /* Setup a LLI transfer */
1059 ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_LINKED_LIST) |
1060 STM32_MDMA_CTCR_TLEN((STM32_MDMA_MAX_BUF_LEN - 1));
1061 ccr |= STM32_MDMA_CCR_BTIE | STM32_MDMA_CCR_CTCIE;
1062 tlen = STM32_MDMA_MAX_BUF_LEN;
1063
1064 for (i = 0, offset = 0; offset < len;
1065 i++, offset += xfer_count) {
1066 xfer_count = min_t(size_t, len - offset,
1067 STM32_MDMA_MAX_BLOCK_LEN);
1068
1069 /* Set source best burst size */
1070 max_width = stm32_mdma_get_max_width(src, len, tlen);
1071 src_bus_width = stm32_mdma_get_width(chan, max_width);
1072
1073 max_burst = tlen / max_width;
1074 best_burst = stm32_mdma_get_best_burst(len, tlen,
1075 max_burst,
1076 max_width);
1077 mdma_burst = ilog2(best_burst);
1078
1079 ctcr |= STM32_MDMA_CTCR_SBURST(mdma_burst) |
1080 STM32_MDMA_CTCR_SSIZE(src_bus_width) |
1081 STM32_MDMA_CTCR_SINCOS(src_bus_width);
1082
1083 /* Set destination best burst size */
1084 max_width = stm32_mdma_get_max_width(dest, len, tlen);
1085 dst_bus_width = stm32_mdma_get_width(chan, max_width);
1086
1087 max_burst = tlen / max_width;
1088 best_burst = stm32_mdma_get_best_burst(len, tlen,
1089 max_burst,
1090 max_width);
1091 mdma_burst = ilog2(best_burst);
1092
1093 ctcr |= STM32_MDMA_CTCR_DBURST(mdma_burst) |
1094 STM32_MDMA_CTCR_DSIZE(dst_bus_width) |
1095 STM32_MDMA_CTCR_DINCOS(dst_bus_width);
1096
1097 if (dst_bus_width != src_bus_width)
1098 ctcr |= STM32_MDMA_CTCR_PKE;
1099
1100 /* Prepare hardware descriptor */
1101 stm32_mdma_setup_hwdesc(chan, desc, DMA_MEM_TO_MEM, i,
1102 src + offset, dest + offset,
1103 xfer_count, ctcr, ctbr,
1104 i == count - 1, i == 0, false);
1105 }
1106 }
1107
1108 desc->ccr = ccr;
1109
1110 desc->cyclic = false;
1111
1112 return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
1113 }
1114
stm32_mdma_dump_reg(struct stm32_mdma_chan * chan)1115 static void stm32_mdma_dump_reg(struct stm32_mdma_chan *chan)
1116 {
1117 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1118
1119 dev_dbg(chan2dev(chan), "CCR: 0x%08x\n",
1120 stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)));
1121 dev_dbg(chan2dev(chan), "CTCR: 0x%08x\n",
1122 stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id)));
1123 dev_dbg(chan2dev(chan), "CBNDTR: 0x%08x\n",
1124 stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id)));
1125 dev_dbg(chan2dev(chan), "CSAR: 0x%08x\n",
1126 stm32_mdma_read(dmadev, STM32_MDMA_CSAR(chan->id)));
1127 dev_dbg(chan2dev(chan), "CDAR: 0x%08x\n",
1128 stm32_mdma_read(dmadev, STM32_MDMA_CDAR(chan->id)));
1129 dev_dbg(chan2dev(chan), "CBRUR: 0x%08x\n",
1130 stm32_mdma_read(dmadev, STM32_MDMA_CBRUR(chan->id)));
1131 dev_dbg(chan2dev(chan), "CLAR: 0x%08x\n",
1132 stm32_mdma_read(dmadev, STM32_MDMA_CLAR(chan->id)));
1133 dev_dbg(chan2dev(chan), "CTBR: 0x%08x\n",
1134 stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id)));
1135 dev_dbg(chan2dev(chan), "CMAR: 0x%08x\n",
1136 stm32_mdma_read(dmadev, STM32_MDMA_CMAR(chan->id)));
1137 dev_dbg(chan2dev(chan), "CMDR: 0x%08x\n",
1138 stm32_mdma_read(dmadev, STM32_MDMA_CMDR(chan->id)));
1139 }
1140
stm32_mdma_start_transfer(struct stm32_mdma_chan * chan)1141 static void stm32_mdma_start_transfer(struct stm32_mdma_chan *chan)
1142 {
1143 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1144 struct virt_dma_desc *vdesc;
1145 struct stm32_mdma_hwdesc *hwdesc;
1146 u32 id = chan->id;
1147 u32 status, reg;
1148
1149 vdesc = vchan_next_desc(&chan->vchan);
1150 if (!vdesc) {
1151 chan->desc = NULL;
1152 return;
1153 }
1154
1155 list_del(&vdesc->node);
1156
1157 chan->desc = to_stm32_mdma_desc(vdesc);
1158 hwdesc = chan->desc->node[0].hwdesc;
1159 chan->curr_hwdesc = 0;
1160
1161 stm32_mdma_write(dmadev, STM32_MDMA_CCR(id), chan->desc->ccr);
1162 stm32_mdma_write(dmadev, STM32_MDMA_CTCR(id), hwdesc->ctcr);
1163 stm32_mdma_write(dmadev, STM32_MDMA_CBNDTR(id), hwdesc->cbndtr);
1164 stm32_mdma_write(dmadev, STM32_MDMA_CSAR(id), hwdesc->csar);
1165 stm32_mdma_write(dmadev, STM32_MDMA_CDAR(id), hwdesc->cdar);
1166 stm32_mdma_write(dmadev, STM32_MDMA_CBRUR(id), hwdesc->cbrur);
1167 stm32_mdma_write(dmadev, STM32_MDMA_CLAR(id), hwdesc->clar);
1168 stm32_mdma_write(dmadev, STM32_MDMA_CTBR(id), hwdesc->ctbr);
1169 stm32_mdma_write(dmadev, STM32_MDMA_CMAR(id), hwdesc->cmar);
1170 stm32_mdma_write(dmadev, STM32_MDMA_CMDR(id), hwdesc->cmdr);
1171
1172 /* Clear interrupt status if it is there */
1173 status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(id));
1174 if (status)
1175 stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(id), status);
1176
1177 stm32_mdma_dump_reg(chan);
1178
1179 /* Start DMA */
1180 stm32_mdma_set_bits(dmadev, STM32_MDMA_CCR(id), STM32_MDMA_CCR_EN);
1181
1182 /* Set SW request in case of MEM2MEM transfer */
1183 if (hwdesc->ctcr & STM32_MDMA_CTCR_SWRM) {
1184 reg = STM32_MDMA_CCR(id);
1185 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_SWRQ);
1186 }
1187
1188 chan->busy = true;
1189
1190 dev_dbg(chan2dev(chan), "vchan %pK: started\n", &chan->vchan);
1191 }
1192
stm32_mdma_issue_pending(struct dma_chan * c)1193 static void stm32_mdma_issue_pending(struct dma_chan *c)
1194 {
1195 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1196 unsigned long flags;
1197
1198 spin_lock_irqsave(&chan->vchan.lock, flags);
1199
1200 if (!vchan_issue_pending(&chan->vchan))
1201 goto end;
1202
1203 dev_dbg(chan2dev(chan), "vchan %pK: issued\n", &chan->vchan);
1204
1205 if (!chan->desc && !chan->busy)
1206 stm32_mdma_start_transfer(chan);
1207
1208 end:
1209 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1210 }
1211
stm32_mdma_pause(struct dma_chan * c)1212 static int stm32_mdma_pause(struct dma_chan *c)
1213 {
1214 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1215 unsigned long flags;
1216 int ret;
1217
1218 spin_lock_irqsave(&chan->vchan.lock, flags);
1219 ret = stm32_mdma_disable_chan(chan);
1220 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1221
1222 if (!ret)
1223 dev_dbg(chan2dev(chan), "vchan %pK: pause\n", &chan->vchan);
1224
1225 return ret;
1226 }
1227
stm32_mdma_resume(struct dma_chan * c)1228 static int stm32_mdma_resume(struct dma_chan *c)
1229 {
1230 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1231 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1232 struct stm32_mdma_hwdesc *hwdesc;
1233 unsigned long flags;
1234 u32 status, reg;
1235
1236 /* Transfer can be terminated */
1237 if (!chan->desc || (stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)) & STM32_MDMA_CCR_EN))
1238 return -EPERM;
1239
1240 hwdesc = chan->desc->node[chan->curr_hwdesc].hwdesc;
1241
1242 spin_lock_irqsave(&chan->vchan.lock, flags);
1243
1244 /* Re-configure control register */
1245 stm32_mdma_write(dmadev, STM32_MDMA_CCR(chan->id), chan->desc->ccr);
1246
1247 /* Clear interrupt status if it is there */
1248 status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id));
1249 if (status)
1250 stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(chan->id), status);
1251
1252 stm32_mdma_dump_reg(chan);
1253
1254 /* Re-start DMA */
1255 reg = STM32_MDMA_CCR(chan->id);
1256 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_EN);
1257
1258 /* Set SW request in case of MEM2MEM transfer */
1259 if (hwdesc->ctcr & STM32_MDMA_CTCR_SWRM)
1260 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_SWRQ);
1261
1262 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1263
1264 dev_dbg(chan2dev(chan), "vchan %pK: resume\n", &chan->vchan);
1265
1266 return 0;
1267 }
1268
stm32_mdma_terminate_all(struct dma_chan * c)1269 static int stm32_mdma_terminate_all(struct dma_chan *c)
1270 {
1271 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1272 unsigned long flags;
1273 LIST_HEAD(head);
1274
1275 spin_lock_irqsave(&chan->vchan.lock, flags);
1276 if (chan->desc) {
1277 vchan_terminate_vdesc(&chan->desc->vdesc);
1278 if (chan->busy)
1279 stm32_mdma_stop(chan);
1280 chan->desc = NULL;
1281 }
1282 vchan_get_all_descriptors(&chan->vchan, &head);
1283 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1284
1285 vchan_dma_desc_free_list(&chan->vchan, &head);
1286
1287 return 0;
1288 }
1289
stm32_mdma_synchronize(struct dma_chan * c)1290 static void stm32_mdma_synchronize(struct dma_chan *c)
1291 {
1292 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1293
1294 vchan_synchronize(&chan->vchan);
1295 }
1296
stm32_mdma_slave_config(struct dma_chan * c,struct dma_slave_config * config)1297 static int stm32_mdma_slave_config(struct dma_chan *c,
1298 struct dma_slave_config *config)
1299 {
1300 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1301
1302 memcpy(&chan->dma_config, config, sizeof(*config));
1303
1304 /* Check if user is requesting STM32 DMA to trigger MDMA */
1305 if (config->peripheral_size) {
1306 struct stm32_mdma_dma_config *mdma_config;
1307
1308 mdma_config = (struct stm32_mdma_dma_config *)chan->dma_config.peripheral_config;
1309 chan->chan_config.request = mdma_config->request;
1310 chan->chan_config.mask_addr = mdma_config->cmar;
1311 chan->chan_config.mask_data = mdma_config->cmdr;
1312 chan->chan_config.m2m_hw = true;
1313 }
1314
1315 return 0;
1316 }
1317
stm32_mdma_desc_residue(struct stm32_mdma_chan * chan,struct stm32_mdma_desc * desc,u32 curr_hwdesc,struct dma_tx_state * state)1318 static size_t stm32_mdma_desc_residue(struct stm32_mdma_chan *chan,
1319 struct stm32_mdma_desc *desc,
1320 u32 curr_hwdesc,
1321 struct dma_tx_state *state)
1322 {
1323 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1324 struct stm32_mdma_hwdesc *hwdesc;
1325 u32 cisr, clar, cbndtr, residue, modulo, burst_size;
1326 int i;
1327
1328 cisr = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id));
1329
1330 residue = 0;
1331 /* Get the next hw descriptor to process from current transfer */
1332 clar = stm32_mdma_read(dmadev, STM32_MDMA_CLAR(chan->id));
1333 for (i = desc->count - 1; i >= 0; i--) {
1334 hwdesc = desc->node[i].hwdesc;
1335
1336 if (hwdesc->clar == clar)
1337 break;/* Current transfer found, stop cumulating */
1338
1339 /* Cumulate residue of unprocessed hw descriptors */
1340 residue += STM32_MDMA_CBNDTR_BNDT(hwdesc->cbndtr);
1341 }
1342 cbndtr = stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id));
1343 residue += cbndtr & STM32_MDMA_CBNDTR_BNDT_MASK;
1344
1345 state->in_flight_bytes = 0;
1346 if (chan->chan_config.m2m_hw && (cisr & STM32_MDMA_CISR_CRQA))
1347 state->in_flight_bytes = cbndtr & STM32_MDMA_CBNDTR_BNDT_MASK;
1348
1349 if (!chan->mem_burst)
1350 return residue;
1351
1352 burst_size = chan->mem_burst * chan->mem_width;
1353 modulo = residue % burst_size;
1354 if (modulo)
1355 residue = residue - modulo + burst_size;
1356
1357 return residue;
1358 }
1359
stm32_mdma_tx_status(struct dma_chan * c,dma_cookie_t cookie,struct dma_tx_state * state)1360 static enum dma_status stm32_mdma_tx_status(struct dma_chan *c,
1361 dma_cookie_t cookie,
1362 struct dma_tx_state *state)
1363 {
1364 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1365 struct virt_dma_desc *vdesc;
1366 enum dma_status status;
1367 unsigned long flags;
1368 u32 residue = 0;
1369
1370 status = dma_cookie_status(c, cookie, state);
1371 if ((status == DMA_COMPLETE) || (!state))
1372 return status;
1373
1374 spin_lock_irqsave(&chan->vchan.lock, flags);
1375
1376 vdesc = vchan_find_desc(&chan->vchan, cookie);
1377 if (chan->desc && cookie == chan->desc->vdesc.tx.cookie)
1378 residue = stm32_mdma_desc_residue(chan, chan->desc, chan->curr_hwdesc, state);
1379 else if (vdesc)
1380 residue = stm32_mdma_desc_residue(chan, to_stm32_mdma_desc(vdesc), 0, state);
1381
1382 dma_set_residue(state, residue);
1383
1384 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1385
1386 return status;
1387 }
1388
stm32_mdma_xfer_end(struct stm32_mdma_chan * chan)1389 static void stm32_mdma_xfer_end(struct stm32_mdma_chan *chan)
1390 {
1391 vchan_cookie_complete(&chan->desc->vdesc);
1392 chan->desc = NULL;
1393 chan->busy = false;
1394
1395 /* Start the next transfer if this driver has a next desc */
1396 stm32_mdma_start_transfer(chan);
1397 }
1398
stm32_mdma_irq_handler(int irq,void * devid)1399 static irqreturn_t stm32_mdma_irq_handler(int irq, void *devid)
1400 {
1401 struct stm32_mdma_device *dmadev = devid;
1402 struct stm32_mdma_chan *chan;
1403 u32 reg, id, ccr, ien, status;
1404
1405 /* Find out which channel generates the interrupt */
1406 status = readl_relaxed(dmadev->base + STM32_MDMA_GISR0);
1407 if (!status) {
1408 dev_dbg(mdma2dev(dmadev), "spurious it\n");
1409 return IRQ_NONE;
1410 }
1411 id = __ffs(status);
1412 chan = &dmadev->chan[id];
1413
1414 /* Handle interrupt for the channel */
1415 spin_lock(&chan->vchan.lock);
1416 status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(id));
1417 /* Mask Channel ReQuest Active bit which can be set in case of MEM2MEM */
1418 status &= ~STM32_MDMA_CISR_CRQA;
1419 ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(id));
1420 ien = (ccr & STM32_MDMA_CCR_IRQ_MASK) >> 1;
1421
1422 if (!(status & ien)) {
1423 spin_unlock(&chan->vchan.lock);
1424 if (chan->busy)
1425 dev_warn(chan2dev(chan),
1426 "spurious it (status=0x%04x, ien=0x%04x)\n", status, ien);
1427 else
1428 dev_dbg(chan2dev(chan),
1429 "spurious it (status=0x%04x, ien=0x%04x)\n", status, ien);
1430 return IRQ_NONE;
1431 }
1432
1433 reg = STM32_MDMA_CIFCR(id);
1434
1435 if (status & STM32_MDMA_CISR_TEIF) {
1436 dev_err(chan2dev(chan), "Transfer Err: stat=0x%08x\n",
1437 readl_relaxed(dmadev->base + STM32_MDMA_CESR(id)));
1438 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CTEIF);
1439 status &= ~STM32_MDMA_CISR_TEIF;
1440 }
1441
1442 if (status & STM32_MDMA_CISR_CTCIF) {
1443 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CCTCIF);
1444 status &= ~STM32_MDMA_CISR_CTCIF;
1445 stm32_mdma_xfer_end(chan);
1446 }
1447
1448 if (status & STM32_MDMA_CISR_BRTIF) {
1449 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CBRTIF);
1450 status &= ~STM32_MDMA_CISR_BRTIF;
1451 }
1452
1453 if (status & STM32_MDMA_CISR_BTIF) {
1454 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CBTIF);
1455 status &= ~STM32_MDMA_CISR_BTIF;
1456 chan->curr_hwdesc++;
1457 if (chan->desc && chan->desc->cyclic) {
1458 if (chan->curr_hwdesc == chan->desc->count)
1459 chan->curr_hwdesc = 0;
1460 vchan_cyclic_callback(&chan->desc->vdesc);
1461 }
1462 }
1463
1464 if (status & STM32_MDMA_CISR_TCIF) {
1465 stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CLTCIF);
1466 status &= ~STM32_MDMA_CISR_TCIF;
1467 }
1468
1469 if (status) {
1470 stm32_mdma_set_bits(dmadev, reg, status);
1471 dev_err(chan2dev(chan), "DMA error: status=0x%08x\n", status);
1472 if (!(ccr & STM32_MDMA_CCR_EN))
1473 dev_err(chan2dev(chan), "chan disabled by HW\n");
1474 }
1475
1476 spin_unlock(&chan->vchan.lock);
1477
1478 return IRQ_HANDLED;
1479 }
1480
stm32_mdma_alloc_chan_resources(struct dma_chan * c)1481 static int stm32_mdma_alloc_chan_resources(struct dma_chan *c)
1482 {
1483 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1484 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1485 int ret;
1486
1487 chan->desc_pool = dmam_pool_create(dev_name(&c->dev->device),
1488 c->device->dev,
1489 sizeof(struct stm32_mdma_hwdesc),
1490 __alignof__(struct stm32_mdma_hwdesc),
1491 0);
1492 if (!chan->desc_pool) {
1493 dev_err(chan2dev(chan), "failed to allocate descriptor pool\n");
1494 return -ENOMEM;
1495 }
1496
1497 ret = pm_runtime_resume_and_get(dmadev->ddev.dev);
1498 if (ret < 0)
1499 return ret;
1500
1501 ret = stm32_mdma_disable_chan(chan);
1502 if (ret < 0)
1503 pm_runtime_put(dmadev->ddev.dev);
1504
1505 return ret;
1506 }
1507
stm32_mdma_free_chan_resources(struct dma_chan * c)1508 static void stm32_mdma_free_chan_resources(struct dma_chan *c)
1509 {
1510 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1511 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1512 unsigned long flags;
1513
1514 dev_dbg(chan2dev(chan), "Freeing channel %d\n", chan->id);
1515
1516 if (chan->busy) {
1517 spin_lock_irqsave(&chan->vchan.lock, flags);
1518 stm32_mdma_stop(chan);
1519 chan->desc = NULL;
1520 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1521 }
1522
1523 pm_runtime_put(dmadev->ddev.dev);
1524 vchan_free_chan_resources(to_virt_chan(c));
1525 dmam_pool_destroy(chan->desc_pool);
1526 chan->desc_pool = NULL;
1527 }
1528
stm32_mdma_filter_fn(struct dma_chan * c,void * fn_param)1529 static bool stm32_mdma_filter_fn(struct dma_chan *c, void *fn_param)
1530 {
1531 struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
1532 struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
1533
1534 /* Check if chan is marked Secure */
1535 if (dmadev->chan_reserved & BIT(chan->id))
1536 return false;
1537
1538 return true;
1539 }
1540
stm32_mdma_of_xlate(struct of_phandle_args * dma_spec,struct of_dma * ofdma)1541 static struct dma_chan *stm32_mdma_of_xlate(struct of_phandle_args *dma_spec,
1542 struct of_dma *ofdma)
1543 {
1544 struct stm32_mdma_device *dmadev = ofdma->of_dma_data;
1545 dma_cap_mask_t mask = dmadev->ddev.cap_mask;
1546 struct stm32_mdma_chan *chan;
1547 struct dma_chan *c;
1548 struct stm32_mdma_chan_config config;
1549
1550 if (dma_spec->args_count < 5) {
1551 dev_err(mdma2dev(dmadev), "Bad number of args\n");
1552 return NULL;
1553 }
1554
1555 memset(&config, 0, sizeof(config));
1556 config.request = dma_spec->args[0];
1557 config.priority_level = dma_spec->args[1];
1558 config.transfer_config = dma_spec->args[2];
1559 config.mask_addr = dma_spec->args[3];
1560 config.mask_data = dma_spec->args[4];
1561
1562 if (config.request >= dmadev->nr_requests) {
1563 dev_err(mdma2dev(dmadev), "Bad request line\n");
1564 return NULL;
1565 }
1566
1567 if (config.priority_level > STM32_MDMA_VERY_HIGH_PRIORITY) {
1568 dev_err(mdma2dev(dmadev), "Priority level not supported\n");
1569 return NULL;
1570 }
1571
1572 c = __dma_request_channel(&mask, stm32_mdma_filter_fn, &config, ofdma->of_node);
1573 if (!c) {
1574 dev_err(mdma2dev(dmadev), "No more channels available\n");
1575 return NULL;
1576 }
1577
1578 chan = to_stm32_mdma_chan(c);
1579 chan->chan_config = config;
1580
1581 return c;
1582 }
1583
1584 static const struct of_device_id stm32_mdma_of_match[] = {
1585 { .compatible = "st,stm32h7-mdma", },
1586 { /* sentinel */ },
1587 };
1588 MODULE_DEVICE_TABLE(of, stm32_mdma_of_match);
1589
stm32_mdma_probe(struct platform_device * pdev)1590 static int stm32_mdma_probe(struct platform_device *pdev)
1591 {
1592 struct stm32_mdma_chan *chan;
1593 struct stm32_mdma_device *dmadev;
1594 struct dma_device *dd;
1595 struct device_node *of_node;
1596 struct reset_control *rst;
1597 u32 nr_channels, nr_requests;
1598 int i, count, ret;
1599
1600 of_node = pdev->dev.of_node;
1601 if (!of_node)
1602 return -ENODEV;
1603
1604 ret = device_property_read_u32(&pdev->dev, "dma-channels",
1605 &nr_channels);
1606 if (ret) {
1607 nr_channels = STM32_MDMA_MAX_CHANNELS;
1608 dev_warn(&pdev->dev, "MDMA defaulting on %i channels\n",
1609 nr_channels);
1610 }
1611
1612 ret = device_property_read_u32(&pdev->dev, "dma-requests",
1613 &nr_requests);
1614 if (ret) {
1615 nr_requests = STM32_MDMA_MAX_REQUESTS;
1616 dev_warn(&pdev->dev, "MDMA defaulting on %i request lines\n",
1617 nr_requests);
1618 }
1619
1620 count = device_property_count_u32(&pdev->dev, "st,ahb-addr-masks");
1621 if (count < 0)
1622 count = 0;
1623
1624 dmadev = devm_kzalloc(&pdev->dev,
1625 struct_size(dmadev, ahb_addr_masks, count),
1626 GFP_KERNEL);
1627 if (!dmadev)
1628 return -ENOMEM;
1629 dmadev->nr_ahb_addr_masks = count;
1630
1631 dmadev->nr_channels = nr_channels;
1632 dmadev->nr_requests = nr_requests;
1633 device_property_read_u32_array(&pdev->dev, "st,ahb-addr-masks",
1634 dmadev->ahb_addr_masks,
1635 count);
1636
1637 dmadev->base = devm_platform_ioremap_resource(pdev, 0);
1638 if (IS_ERR(dmadev->base))
1639 return PTR_ERR(dmadev->base);
1640
1641 dmadev->clk = devm_clk_get(&pdev->dev, NULL);
1642 if (IS_ERR(dmadev->clk))
1643 return dev_err_probe(&pdev->dev, PTR_ERR(dmadev->clk),
1644 "Missing clock controller\n");
1645
1646 ret = clk_prepare_enable(dmadev->clk);
1647 if (ret < 0) {
1648 dev_err(&pdev->dev, "clk_prep_enable error: %d\n", ret);
1649 return ret;
1650 }
1651
1652 rst = devm_reset_control_get(&pdev->dev, NULL);
1653 if (IS_ERR(rst)) {
1654 ret = PTR_ERR(rst);
1655 if (ret == -EPROBE_DEFER)
1656 goto err_clk;
1657 } else {
1658 reset_control_assert(rst);
1659 udelay(2);
1660 reset_control_deassert(rst);
1661 }
1662
1663 dd = &dmadev->ddev;
1664 dma_cap_set(DMA_SLAVE, dd->cap_mask);
1665 dma_cap_set(DMA_PRIVATE, dd->cap_mask);
1666 dma_cap_set(DMA_CYCLIC, dd->cap_mask);
1667 dma_cap_set(DMA_MEMCPY, dd->cap_mask);
1668 dd->device_alloc_chan_resources = stm32_mdma_alloc_chan_resources;
1669 dd->device_free_chan_resources = stm32_mdma_free_chan_resources;
1670 dd->device_tx_status = stm32_mdma_tx_status;
1671 dd->device_issue_pending = stm32_mdma_issue_pending;
1672 dd->device_prep_slave_sg = stm32_mdma_prep_slave_sg;
1673 dd->device_prep_dma_cyclic = stm32_mdma_prep_dma_cyclic;
1674 dd->device_prep_dma_memcpy = stm32_mdma_prep_dma_memcpy;
1675 dd->device_config = stm32_mdma_slave_config;
1676 dd->device_pause = stm32_mdma_pause;
1677 dd->device_resume = stm32_mdma_resume;
1678 dd->device_terminate_all = stm32_mdma_terminate_all;
1679 dd->device_synchronize = stm32_mdma_synchronize;
1680 dd->descriptor_reuse = true;
1681
1682 dd->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1683 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1684 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1685 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
1686 dd->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1687 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1688 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1689 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
1690 dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
1691 BIT(DMA_MEM_TO_MEM);
1692 dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1693 dd->max_burst = STM32_MDMA_MAX_BURST;
1694 dd->dev = &pdev->dev;
1695 INIT_LIST_HEAD(&dd->channels);
1696
1697 for (i = 0; i < dmadev->nr_channels; i++) {
1698 chan = &dmadev->chan[i];
1699 chan->id = i;
1700
1701 if (stm32_mdma_read(dmadev, STM32_MDMA_CCR(i)) & STM32_MDMA_CCR_SM)
1702 dmadev->chan_reserved |= BIT(i);
1703
1704 chan->vchan.desc_free = stm32_mdma_desc_free;
1705 vchan_init(&chan->vchan, dd);
1706 }
1707
1708 dmadev->irq = platform_get_irq(pdev, 0);
1709 if (dmadev->irq < 0) {
1710 ret = dmadev->irq;
1711 goto err_clk;
1712 }
1713
1714 ret = devm_request_irq(&pdev->dev, dmadev->irq, stm32_mdma_irq_handler,
1715 0, dev_name(&pdev->dev), dmadev);
1716 if (ret) {
1717 dev_err(&pdev->dev, "failed to request IRQ\n");
1718 goto err_clk;
1719 }
1720
1721 ret = dmaenginem_async_device_register(dd);
1722 if (ret)
1723 goto err_clk;
1724
1725 ret = of_dma_controller_register(of_node, stm32_mdma_of_xlate, dmadev);
1726 if (ret < 0) {
1727 dev_err(&pdev->dev,
1728 "STM32 MDMA DMA OF registration failed %d\n", ret);
1729 goto err_clk;
1730 }
1731
1732 platform_set_drvdata(pdev, dmadev);
1733 pm_runtime_set_active(&pdev->dev);
1734 pm_runtime_enable(&pdev->dev);
1735 pm_runtime_get_noresume(&pdev->dev);
1736 pm_runtime_put(&pdev->dev);
1737
1738 dev_info(&pdev->dev, "STM32 MDMA driver registered\n");
1739
1740 return 0;
1741
1742 err_clk:
1743 clk_disable_unprepare(dmadev->clk);
1744
1745 return ret;
1746 }
1747
1748 #ifdef CONFIG_PM
stm32_mdma_runtime_suspend(struct device * dev)1749 static int stm32_mdma_runtime_suspend(struct device *dev)
1750 {
1751 struct stm32_mdma_device *dmadev = dev_get_drvdata(dev);
1752
1753 clk_disable_unprepare(dmadev->clk);
1754
1755 return 0;
1756 }
1757
stm32_mdma_runtime_resume(struct device * dev)1758 static int stm32_mdma_runtime_resume(struct device *dev)
1759 {
1760 struct stm32_mdma_device *dmadev = dev_get_drvdata(dev);
1761 int ret;
1762
1763 ret = clk_prepare_enable(dmadev->clk);
1764 if (ret) {
1765 dev_err(dev, "failed to prepare_enable clock\n");
1766 return ret;
1767 }
1768
1769 return 0;
1770 }
1771 #endif
1772
1773 #ifdef CONFIG_PM_SLEEP
stm32_mdma_pm_suspend(struct device * dev)1774 static int stm32_mdma_pm_suspend(struct device *dev)
1775 {
1776 struct stm32_mdma_device *dmadev = dev_get_drvdata(dev);
1777 u32 ccr, id;
1778 int ret;
1779
1780 ret = pm_runtime_resume_and_get(dev);
1781 if (ret < 0)
1782 return ret;
1783
1784 for (id = 0; id < dmadev->nr_channels; id++) {
1785 ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(id));
1786 if (ccr & STM32_MDMA_CCR_EN) {
1787 dev_warn(dev, "Suspend is prevented by Chan %i\n", id);
1788 return -EBUSY;
1789 }
1790 }
1791
1792 pm_runtime_put_sync(dev);
1793
1794 pm_runtime_force_suspend(dev);
1795
1796 return 0;
1797 }
1798
stm32_mdma_pm_resume(struct device * dev)1799 static int stm32_mdma_pm_resume(struct device *dev)
1800 {
1801 return pm_runtime_force_resume(dev);
1802 }
1803 #endif
1804
1805 static const struct dev_pm_ops stm32_mdma_pm_ops = {
1806 SET_SYSTEM_SLEEP_PM_OPS(stm32_mdma_pm_suspend, stm32_mdma_pm_resume)
1807 SET_RUNTIME_PM_OPS(stm32_mdma_runtime_suspend,
1808 stm32_mdma_runtime_resume, NULL)
1809 };
1810
1811 static struct platform_driver stm32_mdma_driver = {
1812 .probe = stm32_mdma_probe,
1813 .driver = {
1814 .name = "stm32-mdma",
1815 .of_match_table = stm32_mdma_of_match,
1816 .pm = &stm32_mdma_pm_ops,
1817 },
1818 };
1819
stm32_mdma_init(void)1820 static int __init stm32_mdma_init(void)
1821 {
1822 return platform_driver_register(&stm32_mdma_driver);
1823 }
1824
1825 subsys_initcall(stm32_mdma_init);
1826
1827 MODULE_DESCRIPTION("Driver for STM32 MDMA controller");
1828 MODULE_AUTHOR("M'boumba Cedric Madianga <cedric.madianga@gmail.com>");
1829 MODULE_AUTHOR("Pierre-Yves Mordret <pierre-yves.mordret@st.com>");
1830