1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2017 Lucas Stach, Pengutronix
4 */
5
6 #include <drm/drm_fourcc.h>
7 #include <linux/clk.h>
8 #include <linux/delay.h>
9 #include <linux/err.h>
10 #include <linux/genalloc.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/platform_device.h>
14 #include <video/imx-ipu-v3.h>
15
16 #include "ipu-prv.h"
17
18 #define IPU_PRE_MAX_WIDTH 2048
19 #define IPU_PRE_NUM_SCANLINES 8
20
21 #define IPU_PRE_CTRL 0x000
22 #define IPU_PRE_CTRL_SET 0x004
23 #define IPU_PRE_CTRL_ENABLE (1 << 0)
24 #define IPU_PRE_CTRL_BLOCK_EN (1 << 1)
25 #define IPU_PRE_CTRL_BLOCK_16 (1 << 2)
26 #define IPU_PRE_CTRL_SDW_UPDATE (1 << 4)
27 #define IPU_PRE_CTRL_VFLIP (1 << 5)
28 #define IPU_PRE_CTRL_SO (1 << 6)
29 #define IPU_PRE_CTRL_INTERLACED_FIELD (1 << 7)
30 #define IPU_PRE_CTRL_HANDSHAKE_EN (1 << 8)
31 #define IPU_PRE_CTRL_HANDSHAKE_LINE_NUM(v) ((v & 0x3) << 9)
32 #define IPU_PRE_CTRL_HANDSHAKE_ABORT_SKIP_EN (1 << 11)
33 #define IPU_PRE_CTRL_EN_REPEAT (1 << 28)
34 #define IPU_PRE_CTRL_TPR_REST_SEL (1 << 29)
35 #define IPU_PRE_CTRL_CLKGATE (1 << 30)
36 #define IPU_PRE_CTRL_SFTRST (1 << 31)
37
38 #define IPU_PRE_CUR_BUF 0x030
39
40 #define IPU_PRE_NEXT_BUF 0x040
41
42 #define IPU_PRE_TPR_CTRL 0x070
43 #define IPU_PRE_TPR_CTRL_TILE_FORMAT(v) ((v & 0xff) << 0)
44 #define IPU_PRE_TPR_CTRL_TILE_FORMAT_MASK 0xff
45 #define IPU_PRE_TPR_CTRL_TILE_FORMAT_16_BIT (1 << 0)
46 #define IPU_PRE_TPR_CTRL_TILE_FORMAT_SPLIT_BUF (1 << 4)
47 #define IPU_PRE_TPR_CTRL_TILE_FORMAT_SINGLE_BUF (1 << 5)
48 #define IPU_PRE_TPR_CTRL_TILE_FORMAT_SUPER_TILED (1 << 6)
49
50 #define IPU_PRE_PREFETCH_ENG_CTRL 0x080
51 #define IPU_PRE_PREF_ENG_CTRL_PREFETCH_EN (1 << 0)
52 #define IPU_PRE_PREF_ENG_CTRL_RD_NUM_BYTES(v) ((v & 0x7) << 1)
53 #define IPU_PRE_PREF_ENG_CTRL_INPUT_ACTIVE_BPP(v) ((v & 0x3) << 4)
54 #define IPU_PRE_PREF_ENG_CTRL_INPUT_PIXEL_FORMAT(v) ((v & 0x7) << 8)
55 #define IPU_PRE_PREF_ENG_CTRL_SHIFT_BYPASS (1 << 11)
56 #define IPU_PRE_PREF_ENG_CTRL_FIELD_INVERSE (1 << 12)
57 #define IPU_PRE_PREF_ENG_CTRL_PARTIAL_UV_SWAP (1 << 14)
58 #define IPU_PRE_PREF_ENG_CTRL_TPR_COOR_OFFSET_EN (1 << 15)
59
60 #define IPU_PRE_PREFETCH_ENG_INPUT_SIZE 0x0a0
61 #define IPU_PRE_PREFETCH_ENG_INPUT_SIZE_WIDTH(v) ((v & 0xffff) << 0)
62 #define IPU_PRE_PREFETCH_ENG_INPUT_SIZE_HEIGHT(v) ((v & 0xffff) << 16)
63
64 #define IPU_PRE_PREFETCH_ENG_PITCH 0x0d0
65 #define IPU_PRE_PREFETCH_ENG_PITCH_Y(v) ((v & 0xffff) << 0)
66 #define IPU_PRE_PREFETCH_ENG_PITCH_UV(v) ((v & 0xffff) << 16)
67
68 #define IPU_PRE_STORE_ENG_CTRL 0x110
69 #define IPU_PRE_STORE_ENG_CTRL_STORE_EN (1 << 0)
70 #define IPU_PRE_STORE_ENG_CTRL_WR_NUM_BYTES(v) ((v & 0x7) << 1)
71 #define IPU_PRE_STORE_ENG_CTRL_OUTPUT_ACTIVE_BPP(v) ((v & 0x3) << 4)
72
73 #define IPU_PRE_STORE_ENG_STATUS 0x120
74 #define IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_X_MASK 0xffff
75 #define IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_X_SHIFT 0
76 #define IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_Y_MASK 0x3fff
77 #define IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_Y_SHIFT 16
78 #define IPU_PRE_STORE_ENG_STATUS_STORE_FIFO_FULL (1 << 30)
79 #define IPU_PRE_STORE_ENG_STATUS_STORE_FIELD (1 << 31)
80
81 #define IPU_PRE_STORE_ENG_SIZE 0x130
82 #define IPU_PRE_STORE_ENG_SIZE_INPUT_WIDTH(v) ((v & 0xffff) << 0)
83 #define IPU_PRE_STORE_ENG_SIZE_INPUT_HEIGHT(v) ((v & 0xffff) << 16)
84
85 #define IPU_PRE_STORE_ENG_PITCH 0x140
86 #define IPU_PRE_STORE_ENG_PITCH_OUT_PITCH(v) ((v & 0xffff) << 0)
87
88 #define IPU_PRE_STORE_ENG_ADDR 0x150
89
90 struct ipu_pre {
91 struct list_head list;
92 struct device *dev;
93
94 void __iomem *regs;
95 struct clk *clk_axi;
96 struct gen_pool *iram;
97
98 dma_addr_t buffer_paddr;
99 void *buffer_virt;
100
101 struct {
102 bool in_use;
103 uint64_t modifier;
104 unsigned int height;
105 unsigned int safe_window_end;
106 unsigned int bufaddr;
107 u32 ctrl;
108 u8 cpp;
109 } cur;
110 };
111
112 static DEFINE_MUTEX(ipu_pre_list_mutex);
113 static LIST_HEAD(ipu_pre_list);
114 static int available_pres;
115
ipu_pre_get_available_count(void)116 int ipu_pre_get_available_count(void)
117 {
118 return available_pres;
119 }
120
121 struct ipu_pre *
ipu_pre_lookup_by_phandle(struct device * dev,const char * name,int index)122 ipu_pre_lookup_by_phandle(struct device *dev, const char *name, int index)
123 {
124 struct device_node *pre_node __free(device_node) =
125 of_parse_phandle(dev->of_node, name, index);
126 struct ipu_pre *pre;
127
128 mutex_lock(&ipu_pre_list_mutex);
129 list_for_each_entry(pre, &ipu_pre_list, list) {
130 if (pre_node == pre->dev->of_node) {
131 mutex_unlock(&ipu_pre_list_mutex);
132 device_link_add(dev, pre->dev,
133 DL_FLAG_AUTOREMOVE_CONSUMER);
134 return pre;
135 }
136 }
137 mutex_unlock(&ipu_pre_list_mutex);
138
139 return NULL;
140 }
141
ipu_pre_get(struct ipu_pre * pre)142 int ipu_pre_get(struct ipu_pre *pre)
143 {
144 u32 val;
145
146 if (pre->cur.in_use)
147 return -EBUSY;
148
149 /* first get the engine out of reset and remove clock gating */
150 writel(0, pre->regs + IPU_PRE_CTRL);
151
152 /* init defaults that should be applied to all streams */
153 val = IPU_PRE_CTRL_HANDSHAKE_ABORT_SKIP_EN |
154 IPU_PRE_CTRL_HANDSHAKE_EN |
155 IPU_PRE_CTRL_TPR_REST_SEL |
156 IPU_PRE_CTRL_SDW_UPDATE;
157 writel(val, pre->regs + IPU_PRE_CTRL);
158
159 pre->cur.in_use = true;
160 return 0;
161 }
162
ipu_pre_put(struct ipu_pre * pre)163 void ipu_pre_put(struct ipu_pre *pre)
164 {
165 writel(IPU_PRE_CTRL_SFTRST, pre->regs + IPU_PRE_CTRL);
166
167 pre->cur.in_use = false;
168 }
169
170 static inline void
ipu_pre_update_safe_window(struct ipu_pre * pre)171 ipu_pre_update_safe_window(struct ipu_pre *pre)
172 {
173 if (pre->cur.modifier == DRM_FORMAT_MOD_LINEAR)
174 pre->cur.safe_window_end = pre->cur.height - 2;
175 else
176 pre->cur.safe_window_end = DIV_ROUND_UP(pre->cur.height, 4) - 1;
177 }
178
179 static void
ipu_pre_configure_modifier(struct ipu_pre * pre,uint64_t modifier)180 ipu_pre_configure_modifier(struct ipu_pre *pre, uint64_t modifier)
181 {
182 u32 val;
183
184 val = readl(pre->regs + IPU_PRE_TPR_CTRL);
185 val &= ~IPU_PRE_TPR_CTRL_TILE_FORMAT_MASK;
186 if (modifier != DRM_FORMAT_MOD_LINEAR) {
187 /* only support single buffer formats for now */
188 val |= IPU_PRE_TPR_CTRL_TILE_FORMAT_SINGLE_BUF;
189 if (modifier == DRM_FORMAT_MOD_VIVANTE_SUPER_TILED)
190 val |= IPU_PRE_TPR_CTRL_TILE_FORMAT_SUPER_TILED;
191 if (pre->cur.cpp == 2)
192 val |= IPU_PRE_TPR_CTRL_TILE_FORMAT_16_BIT;
193 }
194 writel(val, pre->regs + IPU_PRE_TPR_CTRL);
195
196 if (modifier == DRM_FORMAT_MOD_LINEAR)
197 pre->cur.ctrl &= ~IPU_PRE_CTRL_BLOCK_EN;
198 else
199 pre->cur.ctrl |= IPU_PRE_CTRL_BLOCK_EN;
200
201 pre->cur.modifier = modifier;
202 }
203
ipu_pre_configure(struct ipu_pre * pre,unsigned int width,unsigned int height,unsigned int stride,u32 format,uint64_t modifier,unsigned int bufaddr)204 void ipu_pre_configure(struct ipu_pre *pre, unsigned int width,
205 unsigned int height, unsigned int stride, u32 format,
206 uint64_t modifier, unsigned int bufaddr)
207 {
208 const struct drm_format_info *info = drm_format_info(format);
209 u32 active_bpp = info->cpp[0] >> 1;
210 u32 val;
211
212 pre->cur.bufaddr = bufaddr;
213 pre->cur.height = height;
214 pre->cur.cpp = info->cpp[0];
215 pre->cur.ctrl = readl(pre->regs + IPU_PRE_CTRL);
216
217 /* calculate safe window for ctrl register updates */
218 ipu_pre_update_safe_window(pre);
219
220 writel(bufaddr, pre->regs + IPU_PRE_CUR_BUF);
221 writel(bufaddr, pre->regs + IPU_PRE_NEXT_BUF);
222
223 val = IPU_PRE_PREF_ENG_CTRL_INPUT_PIXEL_FORMAT(0) |
224 IPU_PRE_PREF_ENG_CTRL_INPUT_ACTIVE_BPP(active_bpp) |
225 IPU_PRE_PREF_ENG_CTRL_RD_NUM_BYTES(4) |
226 IPU_PRE_PREF_ENG_CTRL_SHIFT_BYPASS |
227 IPU_PRE_PREF_ENG_CTRL_PREFETCH_EN;
228 writel(val, pre->regs + IPU_PRE_PREFETCH_ENG_CTRL);
229
230 val = IPU_PRE_PREFETCH_ENG_INPUT_SIZE_WIDTH(width) |
231 IPU_PRE_PREFETCH_ENG_INPUT_SIZE_HEIGHT(height);
232 writel(val, pre->regs + IPU_PRE_PREFETCH_ENG_INPUT_SIZE);
233
234 val = IPU_PRE_PREFETCH_ENG_PITCH_Y(stride);
235 writel(val, pre->regs + IPU_PRE_PREFETCH_ENG_PITCH);
236
237 val = IPU_PRE_STORE_ENG_CTRL_OUTPUT_ACTIVE_BPP(active_bpp) |
238 IPU_PRE_STORE_ENG_CTRL_WR_NUM_BYTES(4) |
239 IPU_PRE_STORE_ENG_CTRL_STORE_EN;
240 writel(val, pre->regs + IPU_PRE_STORE_ENG_CTRL);
241
242 val = IPU_PRE_STORE_ENG_SIZE_INPUT_WIDTH(width) |
243 IPU_PRE_STORE_ENG_SIZE_INPUT_HEIGHT(height);
244 writel(val, pre->regs + IPU_PRE_STORE_ENG_SIZE);
245
246 val = IPU_PRE_STORE_ENG_PITCH_OUT_PITCH(stride);
247 writel(val, pre->regs + IPU_PRE_STORE_ENG_PITCH);
248
249 writel(pre->buffer_paddr, pre->regs + IPU_PRE_STORE_ENG_ADDR);
250
251 ipu_pre_configure_modifier(pre, modifier);
252
253 pre->cur.ctrl |= IPU_PRE_CTRL_EN_REPEAT | IPU_PRE_CTRL_ENABLE;
254 writel(pre->cur.ctrl | IPU_PRE_CTRL_SDW_UPDATE,
255 pre->regs + IPU_PRE_CTRL);
256 }
257
ipu_pre_update(struct ipu_pre * pre,uint64_t modifier,unsigned int bufaddr)258 void ipu_pre_update(struct ipu_pre *pre, uint64_t modifier, unsigned int bufaddr)
259 {
260 if (bufaddr == pre->cur.bufaddr &&
261 modifier == pre->cur.modifier)
262 return;
263
264 writel(bufaddr, pre->regs + IPU_PRE_NEXT_BUF);
265 pre->cur.bufaddr = bufaddr;
266
267 if (modifier != pre->cur.modifier)
268 ipu_pre_configure_modifier(pre, modifier);
269
270 for (int i = 0;; i++) {
271 unsigned short current_yblock;
272 u32 val;
273
274 if (i > 500) {
275 dev_warn(pre->dev, "timeout waiting for PRE safe window\n");
276 return;
277 }
278
279 val = readl(pre->regs + IPU_PRE_STORE_ENG_STATUS);
280 current_yblock =
281 (val >> IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_Y_SHIFT) &
282 IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_Y_MASK;
283
284 if (current_yblock != 0 &&
285 current_yblock < pre->cur.safe_window_end)
286 break;
287
288 udelay(10);
289 cpu_relax();
290 }
291
292 writel(pre->cur.ctrl | IPU_PRE_CTRL_SDW_UPDATE,
293 pre->regs + IPU_PRE_CTRL);
294
295 /* calculate safe window for the next update with the new modifier */
296 ipu_pre_update_safe_window(pre);
297 }
298
ipu_pre_update_pending(struct ipu_pre * pre)299 bool ipu_pre_update_pending(struct ipu_pre *pre)
300 {
301 return !!(readl_relaxed(pre->regs + IPU_PRE_CTRL) &
302 IPU_PRE_CTRL_SDW_UPDATE);
303 }
304
ipu_pre_get_baddr(struct ipu_pre * pre)305 u32 ipu_pre_get_baddr(struct ipu_pre *pre)
306 {
307 return (u32)pre->buffer_paddr;
308 }
309
ipu_pre_probe(struct platform_device * pdev)310 static int ipu_pre_probe(struct platform_device *pdev)
311 {
312 struct device *dev = &pdev->dev;
313 struct ipu_pre *pre;
314
315 pre = devm_kzalloc(dev, sizeof(*pre), GFP_KERNEL);
316 if (!pre)
317 return -ENOMEM;
318
319 pre->regs = devm_platform_ioremap_resource(pdev, 0);
320 if (IS_ERR(pre->regs))
321 return PTR_ERR(pre->regs);
322
323 pre->clk_axi = devm_clk_get(dev, "axi");
324 if (IS_ERR(pre->clk_axi))
325 return PTR_ERR(pre->clk_axi);
326
327 pre->iram = of_gen_pool_get(dev->of_node, "fsl,iram", 0);
328 if (!pre->iram)
329 return -EPROBE_DEFER;
330
331 /*
332 * Allocate IRAM buffer with maximum size. This could be made dynamic,
333 * but as there is no other user of this IRAM region and we can fit all
334 * max sized buffers into it, there is no need yet.
335 */
336 pre->buffer_virt = gen_pool_dma_alloc(pre->iram, IPU_PRE_MAX_WIDTH *
337 IPU_PRE_NUM_SCANLINES * 4,
338 &pre->buffer_paddr);
339 if (!pre->buffer_virt)
340 return -ENOMEM;
341
342 clk_prepare_enable(pre->clk_axi);
343
344 pre->dev = dev;
345 platform_set_drvdata(pdev, pre);
346 mutex_lock(&ipu_pre_list_mutex);
347 list_add(&pre->list, &ipu_pre_list);
348 available_pres++;
349 mutex_unlock(&ipu_pre_list_mutex);
350
351 return 0;
352 }
353
ipu_pre_remove(struct platform_device * pdev)354 static void ipu_pre_remove(struct platform_device *pdev)
355 {
356 struct ipu_pre *pre = platform_get_drvdata(pdev);
357
358 mutex_lock(&ipu_pre_list_mutex);
359 list_del(&pre->list);
360 available_pres--;
361 mutex_unlock(&ipu_pre_list_mutex);
362
363 clk_disable_unprepare(pre->clk_axi);
364
365 if (pre->buffer_virt)
366 gen_pool_free(pre->iram, (unsigned long)pre->buffer_virt,
367 IPU_PRE_MAX_WIDTH * IPU_PRE_NUM_SCANLINES * 4);
368 }
369
370 static const struct of_device_id ipu_pre_dt_ids[] = {
371 { .compatible = "fsl,imx6qp-pre", },
372 { /* sentinel */ },
373 };
374
375 struct platform_driver ipu_pre_drv = {
376 .probe = ipu_pre_probe,
377 .remove_new = ipu_pre_remove,
378 .driver = {
379 .name = "imx-ipu-pre",
380 .of_match_table = ipu_pre_dt_ids,
381 },
382 };
383