1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * i.MX6 Video Data Order Adapter (VDOA)
4 *
5 * Copyright (C) 2014 Philipp Zabel
6 * Copyright (C) 2016 Pengutronix, Michael Tretter <kernel@pengutronix.de>
7 */
8
9 #include <linux/clk.h>
10 #include <linux/device.h>
11 #include <linux/interrupt.h>
12 #include <linux/module.h>
13 #include <linux/mod_devicetable.h>
14 #include <linux/dma-mapping.h>
15 #include <linux/platform_device.h>
16 #include <linux/videodev2.h>
17 #include <linux/slab.h>
18
19 #include "imx-vdoa.h"
20
21 #define VDOA_NAME "imx-vdoa"
22
23 #define VDOAC 0x00
24 #define VDOASRR 0x04
25 #define VDOAIE 0x08
26 #define VDOAIST 0x0c
27 #define VDOAFP 0x10
28 #define VDOAIEBA00 0x14
29 #define VDOAIEBA01 0x18
30 #define VDOAIEBA02 0x1c
31 #define VDOAIEBA10 0x20
32 #define VDOAIEBA11 0x24
33 #define VDOAIEBA12 0x28
34 #define VDOASL 0x2c
35 #define VDOAIUBO 0x30
36 #define VDOAVEBA0 0x34
37 #define VDOAVEBA1 0x38
38 #define VDOAVEBA2 0x3c
39 #define VDOAVUBO 0x40
40 #define VDOASR 0x44
41
42 #define VDOAC_ISEL BIT(6)
43 #define VDOAC_PFS BIT(5)
44 #define VDOAC_SO BIT(4)
45 #define VDOAC_SYNC BIT(3)
46 #define VDOAC_NF BIT(2)
47 #define VDOAC_BNDM_MASK 0x3
48 #define VDOAC_BAND_HEIGHT_8 0x0
49 #define VDOAC_BAND_HEIGHT_16 0x1
50 #define VDOAC_BAND_HEIGHT_32 0x2
51
52 #define VDOASRR_START BIT(1)
53 #define VDOASRR_SWRST BIT(0)
54
55 #define VDOAIE_EITERR BIT(1)
56 #define VDOAIE_EIEOT BIT(0)
57
58 #define VDOAIST_TERR BIT(1)
59 #define VDOAIST_EOT BIT(0)
60
61 #define VDOAFP_FH_MASK (0x1fff << 16)
62 #define VDOAFP_FW_MASK (0x3fff)
63
64 #define VDOASL_VSLY_MASK (0x3fff << 16)
65 #define VDOASL_ISLY_MASK (0x7fff)
66
67 #define VDOASR_ERRW BIT(4)
68 #define VDOASR_EOB BIT(3)
69 #define VDOASR_CURRENT_FRAME (0x3 << 1)
70 #define VDOASR_CURRENT_BUFFER BIT(1)
71
72 enum {
73 V4L2_M2M_SRC = 0,
74 V4L2_M2M_DST = 1,
75 };
76
77 struct vdoa_data {
78 struct vdoa_ctx *curr_ctx;
79 struct device *dev;
80 struct clk *vdoa_clk;
81 void __iomem *regs;
82 };
83
84 struct vdoa_q_data {
85 unsigned int width;
86 unsigned int height;
87 unsigned int bytesperline;
88 unsigned int sizeimage;
89 u32 pixelformat;
90 };
91
92 struct vdoa_ctx {
93 struct vdoa_data *vdoa;
94 struct completion completion;
95 struct vdoa_q_data q_data[2];
96 unsigned int submitted_job;
97 unsigned int completed_job;
98 };
99
vdoa_irq_handler(int irq,void * data)100 static irqreturn_t vdoa_irq_handler(int irq, void *data)
101 {
102 struct vdoa_data *vdoa = data;
103 struct vdoa_ctx *curr_ctx;
104 u32 val;
105
106 /* Disable interrupts */
107 writel(0, vdoa->regs + VDOAIE);
108
109 curr_ctx = vdoa->curr_ctx;
110 if (!curr_ctx) {
111 dev_warn(vdoa->dev,
112 "Instance released before the end of transaction\n");
113 return IRQ_HANDLED;
114 }
115
116 val = readl(vdoa->regs + VDOAIST);
117 writel(val, vdoa->regs + VDOAIST);
118 if (val & VDOAIST_TERR) {
119 val = readl(vdoa->regs + VDOASR) & VDOASR_ERRW;
120 dev_err(vdoa->dev, "AXI %s error\n", val ? "write" : "read");
121 } else if (!(val & VDOAIST_EOT)) {
122 dev_warn(vdoa->dev, "Spurious interrupt\n");
123 }
124 curr_ctx->completed_job++;
125 complete(&curr_ctx->completion);
126
127 return IRQ_HANDLED;
128 }
129
vdoa_wait_for_completion(struct vdoa_ctx * ctx)130 int vdoa_wait_for_completion(struct vdoa_ctx *ctx)
131 {
132 struct vdoa_data *vdoa = ctx->vdoa;
133
134 if (ctx->submitted_job == ctx->completed_job)
135 return 0;
136
137 if (!wait_for_completion_timeout(&ctx->completion,
138 msecs_to_jiffies(300))) {
139 dev_err(vdoa->dev,
140 "Timeout waiting for transfer result\n");
141 return -ETIMEDOUT;
142 }
143
144 return 0;
145 }
146 EXPORT_SYMBOL(vdoa_wait_for_completion);
147
vdoa_device_run(struct vdoa_ctx * ctx,dma_addr_t dst,dma_addr_t src)148 void vdoa_device_run(struct vdoa_ctx *ctx, dma_addr_t dst, dma_addr_t src)
149 {
150 struct vdoa_q_data *src_q_data, *dst_q_data;
151 struct vdoa_data *vdoa = ctx->vdoa;
152 u32 val;
153
154 if (vdoa->curr_ctx)
155 vdoa_wait_for_completion(vdoa->curr_ctx);
156
157 vdoa->curr_ctx = ctx;
158
159 reinit_completion(&ctx->completion);
160 ctx->submitted_job++;
161
162 src_q_data = &ctx->q_data[V4L2_M2M_SRC];
163 dst_q_data = &ctx->q_data[V4L2_M2M_DST];
164
165 /* Progressive, no sync, 1 frame per run */
166 if (dst_q_data->pixelformat == V4L2_PIX_FMT_YUYV)
167 val = VDOAC_PFS;
168 else
169 val = 0;
170 writel(val, vdoa->regs + VDOAC);
171
172 writel(dst_q_data->height << 16 | dst_q_data->width,
173 vdoa->regs + VDOAFP);
174
175 val = dst;
176 writel(val, vdoa->regs + VDOAIEBA00);
177
178 writel(src_q_data->bytesperline << 16 | dst_q_data->bytesperline,
179 vdoa->regs + VDOASL);
180
181 if (dst_q_data->pixelformat == V4L2_PIX_FMT_NV12 ||
182 dst_q_data->pixelformat == V4L2_PIX_FMT_NV21)
183 val = dst_q_data->bytesperline * dst_q_data->height;
184 else
185 val = 0;
186 writel(val, vdoa->regs + VDOAIUBO);
187
188 val = src;
189 writel(val, vdoa->regs + VDOAVEBA0);
190 val = round_up(src_q_data->bytesperline * src_q_data->height, 4096);
191 writel(val, vdoa->regs + VDOAVUBO);
192
193 /* Enable interrupts and start transfer */
194 writel(VDOAIE_EITERR | VDOAIE_EIEOT, vdoa->regs + VDOAIE);
195 writel(VDOASRR_START, vdoa->regs + VDOASRR);
196 }
197 EXPORT_SYMBOL(vdoa_device_run);
198
vdoa_context_create(struct vdoa_data * vdoa)199 struct vdoa_ctx *vdoa_context_create(struct vdoa_data *vdoa)
200 {
201 struct vdoa_ctx *ctx;
202 int err;
203
204 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
205 if (!ctx)
206 return NULL;
207
208 err = clk_prepare_enable(vdoa->vdoa_clk);
209 if (err) {
210 kfree(ctx);
211 return NULL;
212 }
213
214 init_completion(&ctx->completion);
215 ctx->vdoa = vdoa;
216
217 return ctx;
218 }
219 EXPORT_SYMBOL(vdoa_context_create);
220
vdoa_context_destroy(struct vdoa_ctx * ctx)221 void vdoa_context_destroy(struct vdoa_ctx *ctx)
222 {
223 struct vdoa_data *vdoa = ctx->vdoa;
224
225 if (vdoa->curr_ctx == ctx) {
226 vdoa_wait_for_completion(vdoa->curr_ctx);
227 vdoa->curr_ctx = NULL;
228 }
229
230 clk_disable_unprepare(vdoa->vdoa_clk);
231 kfree(ctx);
232 }
233 EXPORT_SYMBOL(vdoa_context_destroy);
234
vdoa_context_configure(struct vdoa_ctx * ctx,unsigned int width,unsigned int height,u32 pixelformat)235 int vdoa_context_configure(struct vdoa_ctx *ctx,
236 unsigned int width, unsigned int height,
237 u32 pixelformat)
238 {
239 struct vdoa_q_data *src_q_data;
240 struct vdoa_q_data *dst_q_data;
241
242 if (width < 16 || width > 8192 || width % 16 != 0 ||
243 height < 16 || height > 4096 || height % 16 != 0)
244 return -EINVAL;
245
246 if (pixelformat != V4L2_PIX_FMT_YUYV &&
247 pixelformat != V4L2_PIX_FMT_NV12)
248 return -EINVAL;
249
250 /* If no context is passed, only check if the format is valid */
251 if (!ctx)
252 return 0;
253
254 src_q_data = &ctx->q_data[V4L2_M2M_SRC];
255 dst_q_data = &ctx->q_data[V4L2_M2M_DST];
256
257 src_q_data->width = width;
258 src_q_data->height = height;
259 src_q_data->bytesperline = width;
260 src_q_data->sizeimage =
261 round_up(src_q_data->bytesperline * height, 4096) +
262 src_q_data->bytesperline * height / 2;
263
264 dst_q_data->width = width;
265 dst_q_data->height = height;
266 dst_q_data->pixelformat = pixelformat;
267 switch (pixelformat) {
268 case V4L2_PIX_FMT_YUYV:
269 dst_q_data->bytesperline = width * 2;
270 dst_q_data->sizeimage = dst_q_data->bytesperline * height;
271 break;
272 case V4L2_PIX_FMT_NV12:
273 default:
274 dst_q_data->bytesperline = width;
275 dst_q_data->sizeimage =
276 dst_q_data->bytesperline * height * 3 / 2;
277 break;
278 }
279
280 return 0;
281 }
282 EXPORT_SYMBOL(vdoa_context_configure);
283
vdoa_probe(struct platform_device * pdev)284 static int vdoa_probe(struct platform_device *pdev)
285 {
286 struct vdoa_data *vdoa;
287 int ret;
288
289 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
290 if (ret) {
291 dev_err(&pdev->dev, "DMA enable failed\n");
292 return ret;
293 }
294
295 vdoa = devm_kzalloc(&pdev->dev, sizeof(*vdoa), GFP_KERNEL);
296 if (!vdoa)
297 return -ENOMEM;
298
299 vdoa->dev = &pdev->dev;
300
301 vdoa->vdoa_clk = devm_clk_get(vdoa->dev, NULL);
302 if (IS_ERR(vdoa->vdoa_clk)) {
303 dev_err(vdoa->dev, "Failed to get clock\n");
304 return PTR_ERR(vdoa->vdoa_clk);
305 }
306
307 vdoa->regs = devm_platform_ioremap_resource(pdev, 0);
308 if (IS_ERR(vdoa->regs))
309 return PTR_ERR(vdoa->regs);
310
311 ret = platform_get_irq(pdev, 0);
312 if (ret < 0)
313 return ret;
314 ret = devm_request_threaded_irq(&pdev->dev, ret, NULL,
315 vdoa_irq_handler, IRQF_ONESHOT,
316 "vdoa", vdoa);
317 if (ret < 0) {
318 dev_err(vdoa->dev, "Failed to get irq\n");
319 return ret;
320 }
321
322 platform_set_drvdata(pdev, vdoa);
323
324 return 0;
325 }
326
327 static const struct of_device_id vdoa_dt_ids[] = {
328 { .compatible = "fsl,imx6q-vdoa" },
329 {}
330 };
331 MODULE_DEVICE_TABLE(of, vdoa_dt_ids);
332
333 static struct platform_driver vdoa_driver = {
334 .probe = vdoa_probe,
335 .driver = {
336 .name = VDOA_NAME,
337 .of_match_table = vdoa_dt_ids,
338 },
339 };
340
341 module_platform_driver(vdoa_driver);
342
343 MODULE_DESCRIPTION("Video Data Order Adapter");
344 MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
345 MODULE_ALIAS("platform:imx-vdoa");
346 MODULE_LICENSE("GPL");
347