1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
4 * Parts of this file were based on sources as follows:
5 *
6 * Copyright (C) 2006-2008 Intel Corporation
7 * Copyright (C) 2007 Amos Lee <amos_lee@storlinksemi.com>
8 * Copyright (C) 2007 Dave Airlie <airlied@linux.ie>
9 * Copyright (C) 2011 Texas Instruments
10 * Copyright (C) 2017 Eric Anholt
11 */
12
13 #include <linux/clk.h>
14 #include <linux/dma-buf.h>
15 #include <linux/of_graph.h>
16 #include <linux/delay.h>
17
18 #include <drm/drm_fb_dma_helper.h>
19 #include <drm/drm_fourcc.h>
20 #include <drm/drm_framebuffer.h>
21 #include <drm/drm_gem_atomic_helper.h>
22 #include <drm/drm_gem_dma_helper.h>
23 #include <drm/drm_panel.h>
24 #include <drm/drm_vblank.h>
25
26 #include "tve200_drm.h"
27
tve200_irq(int irq,void * data)28 irqreturn_t tve200_irq(int irq, void *data)
29 {
30 struct tve200_drm_dev_private *priv = data;
31 u32 stat;
32 u32 val;
33
34 stat = readl(priv->regs + TVE200_INT_STAT);
35
36 if (!stat)
37 return IRQ_NONE;
38
39 /*
40 * Vblank IRQ
41 *
42 * The hardware is a bit tilted: the line stays high after clearing
43 * the vblank IRQ, firing many more interrupts. We counter this
44 * by toggling the IRQ back and forth from firing at vblank and
45 * firing at start of active image, which works around the problem
46 * since those occur strictly in sequence, and we get two IRQs for each
47 * frame, one at start of Vblank (that we make call into the CRTC) and
48 * another one at the start of the image (that we discard).
49 */
50 if (stat & TVE200_INT_V_STATUS) {
51 val = readl(priv->regs + TVE200_CTRL);
52 /* We have an actual start of vsync */
53 if (!(val & TVE200_VSTSTYPE_BITS)) {
54 drm_crtc_handle_vblank(&priv->pipe.crtc);
55 /* Toggle trigger to start of active image */
56 val |= TVE200_VSTSTYPE_VAI;
57 } else {
58 /* Toggle trigger back to start of vsync */
59 val &= ~TVE200_VSTSTYPE_BITS;
60 }
61 writel(val, priv->regs + TVE200_CTRL);
62 } else
63 dev_err(priv->drm->dev, "stray IRQ %08x\n", stat);
64
65 /* Clear the interrupt once done */
66 writel(stat, priv->regs + TVE200_INT_CLR);
67
68 return IRQ_HANDLED;
69 }
70
tve200_display_check(struct drm_simple_display_pipe * pipe,struct drm_plane_state * pstate,struct drm_crtc_state * cstate)71 static int tve200_display_check(struct drm_simple_display_pipe *pipe,
72 struct drm_plane_state *pstate,
73 struct drm_crtc_state *cstate)
74 {
75 const struct drm_display_mode *mode = &cstate->mode;
76 struct drm_framebuffer *old_fb = pipe->plane.state->fb;
77 struct drm_framebuffer *fb = pstate->fb;
78
79 /*
80 * We support these specific resolutions and nothing else.
81 */
82 if (!(mode->hdisplay == 352 && mode->vdisplay == 240) && /* SIF(525) */
83 !(mode->hdisplay == 352 && mode->vdisplay == 288) && /* CIF(625) */
84 !(mode->hdisplay == 640 && mode->vdisplay == 480) && /* VGA */
85 !(mode->hdisplay == 720 && mode->vdisplay == 480) && /* D1 */
86 !(mode->hdisplay == 720 && mode->vdisplay == 576)) { /* D1 */
87 DRM_DEBUG_KMS("unsupported display mode (%u x %u)\n",
88 mode->hdisplay, mode->vdisplay);
89 return -EINVAL;
90 }
91
92 if (fb) {
93 u32 offset = drm_fb_dma_get_gem_addr(fb, pstate, 0);
94
95 /* FB base address must be dword aligned. */
96 if (offset & 3) {
97 DRM_DEBUG_KMS("FB not 32-bit aligned\n");
98 return -EINVAL;
99 }
100
101 /*
102 * There's no pitch register, the mode's hdisplay
103 * controls this.
104 */
105 if (fb->pitches[0] != mode->hdisplay * fb->format->cpp[0]) {
106 DRM_DEBUG_KMS("can't handle pitches\n");
107 return -EINVAL;
108 }
109
110 /*
111 * We can't change the FB format in a flicker-free
112 * manner (and only update it during CRTC enable).
113 */
114 if (old_fb && old_fb->format != fb->format)
115 cstate->mode_changed = true;
116 }
117
118 return 0;
119 }
120
tve200_display_enable(struct drm_simple_display_pipe * pipe,struct drm_crtc_state * cstate,struct drm_plane_state * plane_state)121 static void tve200_display_enable(struct drm_simple_display_pipe *pipe,
122 struct drm_crtc_state *cstate,
123 struct drm_plane_state *plane_state)
124 {
125 struct drm_crtc *crtc = &pipe->crtc;
126 struct drm_plane *plane = &pipe->plane;
127 struct drm_device *drm = crtc->dev;
128 struct tve200_drm_dev_private *priv = drm->dev_private;
129 const struct drm_display_mode *mode = &cstate->mode;
130 struct drm_framebuffer *fb = plane->state->fb;
131 struct drm_connector *connector = priv->connector;
132 u32 format = fb->format->format;
133 u32 ctrl1 = 0;
134 int retries;
135
136 clk_prepare_enable(priv->clk);
137
138 /* Reset the TVE200 and wait for it to come back online */
139 writel(TVE200_CTRL_4_RESET, priv->regs + TVE200_CTRL_4);
140 for (retries = 0; retries < 5; retries++) {
141 usleep_range(30000, 50000);
142 if (readl(priv->regs + TVE200_CTRL_4) & TVE200_CTRL_4_RESET)
143 continue;
144 else
145 break;
146 }
147 if (retries == 5 &&
148 readl(priv->regs + TVE200_CTRL_4) & TVE200_CTRL_4_RESET) {
149 dev_err(drm->dev, "can't get hardware out of reset\n");
150 return;
151 }
152
153 /* Function 1 */
154 ctrl1 |= TVE200_CTRL_CSMODE;
155 /* Interlace mode for CCIR656: parameterize? */
156 ctrl1 |= TVE200_CTRL_NONINTERLACE;
157 /* 32 words per burst */
158 ctrl1 |= TVE200_CTRL_BURST_32_WORDS;
159 /* 16 retries */
160 ctrl1 |= TVE200_CTRL_RETRYCNT_16;
161 /* NTSC mode: parametrize? */
162 ctrl1 |= TVE200_CTRL_NTSC;
163
164 /* Vsync IRQ at start of Vsync at first */
165 ctrl1 |= TVE200_VSTSTYPE_VSYNC;
166
167 if (connector->display_info.bus_flags &
168 DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
169 ctrl1 |= TVE200_CTRL_TVCLKP;
170
171 if ((mode->hdisplay == 352 && mode->vdisplay == 240) || /* SIF(525) */
172 (mode->hdisplay == 352 && mode->vdisplay == 288)) { /* CIF(625) */
173 ctrl1 |= TVE200_CTRL_IPRESOL_CIF;
174 dev_info(drm->dev, "CIF mode\n");
175 } else if (mode->hdisplay == 640 && mode->vdisplay == 480) {
176 ctrl1 |= TVE200_CTRL_IPRESOL_VGA;
177 dev_info(drm->dev, "VGA mode\n");
178 } else if ((mode->hdisplay == 720 && mode->vdisplay == 480) ||
179 (mode->hdisplay == 720 && mode->vdisplay == 576)) {
180 ctrl1 |= TVE200_CTRL_IPRESOL_D1;
181 dev_info(drm->dev, "D1 mode\n");
182 }
183
184 if (format & DRM_FORMAT_BIG_ENDIAN) {
185 ctrl1 |= TVE200_CTRL_BBBP;
186 format &= ~DRM_FORMAT_BIG_ENDIAN;
187 }
188
189 switch (format) {
190 case DRM_FORMAT_XRGB8888:
191 ctrl1 |= TVE200_IPDMOD_RGB888;
192 break;
193 case DRM_FORMAT_RGB565:
194 ctrl1 |= TVE200_IPDMOD_RGB565;
195 break;
196 case DRM_FORMAT_XRGB1555:
197 ctrl1 |= TVE200_IPDMOD_RGB555;
198 break;
199 case DRM_FORMAT_XBGR8888:
200 ctrl1 |= TVE200_IPDMOD_RGB888 | TVE200_BGR;
201 break;
202 case DRM_FORMAT_BGR565:
203 ctrl1 |= TVE200_IPDMOD_RGB565 | TVE200_BGR;
204 break;
205 case DRM_FORMAT_XBGR1555:
206 ctrl1 |= TVE200_IPDMOD_RGB555 | TVE200_BGR;
207 break;
208 case DRM_FORMAT_YUYV:
209 ctrl1 |= TVE200_IPDMOD_YUV422;
210 ctrl1 |= TVE200_CTRL_YCBCRODR_CR0Y1CB0Y0;
211 break;
212 case DRM_FORMAT_YVYU:
213 ctrl1 |= TVE200_IPDMOD_YUV422;
214 ctrl1 |= TVE200_CTRL_YCBCRODR_CB0Y1CR0Y0;
215 break;
216 case DRM_FORMAT_UYVY:
217 ctrl1 |= TVE200_IPDMOD_YUV422;
218 ctrl1 |= TVE200_CTRL_YCBCRODR_Y1CR0Y0CB0;
219 break;
220 case DRM_FORMAT_VYUY:
221 ctrl1 |= TVE200_IPDMOD_YUV422;
222 ctrl1 |= TVE200_CTRL_YCBCRODR_Y1CB0Y0CR0;
223 break;
224 case DRM_FORMAT_YUV420:
225 ctrl1 |= TVE200_CTRL_YUV420;
226 ctrl1 |= TVE200_IPDMOD_YUV420;
227 break;
228 default:
229 dev_err(drm->dev, "Unknown FB format 0x%08x\n",
230 fb->format->format);
231 break;
232 }
233
234 ctrl1 |= TVE200_TVEEN;
235
236 /* Turn it on */
237 writel(ctrl1, priv->regs + TVE200_CTRL);
238
239 drm_crtc_vblank_on(crtc);
240 }
241
tve200_display_disable(struct drm_simple_display_pipe * pipe)242 static void tve200_display_disable(struct drm_simple_display_pipe *pipe)
243 {
244 struct drm_crtc *crtc = &pipe->crtc;
245 struct drm_device *drm = crtc->dev;
246 struct tve200_drm_dev_private *priv = drm->dev_private;
247
248 drm_crtc_vblank_off(crtc);
249
250 /* Disable put into reset and Power Down */
251 writel(0, priv->regs + TVE200_CTRL);
252 writel(TVE200_CTRL_4_RESET, priv->regs + TVE200_CTRL_4);
253
254 clk_disable_unprepare(priv->clk);
255 }
256
tve200_display_update(struct drm_simple_display_pipe * pipe,struct drm_plane_state * old_pstate)257 static void tve200_display_update(struct drm_simple_display_pipe *pipe,
258 struct drm_plane_state *old_pstate)
259 {
260 struct drm_crtc *crtc = &pipe->crtc;
261 struct drm_device *drm = crtc->dev;
262 struct tve200_drm_dev_private *priv = drm->dev_private;
263 struct drm_pending_vblank_event *event = crtc->state->event;
264 struct drm_plane *plane = &pipe->plane;
265 struct drm_plane_state *pstate = plane->state;
266 struct drm_framebuffer *fb = pstate->fb;
267
268 if (fb) {
269 /* For RGB, the Y component is used as base address */
270 writel(drm_fb_dma_get_gem_addr(fb, pstate, 0),
271 priv->regs + TVE200_Y_FRAME_BASE_ADDR);
272
273 /* For three plane YUV we need two more addresses */
274 if (fb->format->format == DRM_FORMAT_YUV420) {
275 writel(drm_fb_dma_get_gem_addr(fb, pstate, 1),
276 priv->regs + TVE200_U_FRAME_BASE_ADDR);
277 writel(drm_fb_dma_get_gem_addr(fb, pstate, 2),
278 priv->regs + TVE200_V_FRAME_BASE_ADDR);
279 }
280 }
281
282 if (event) {
283 crtc->state->event = NULL;
284
285 spin_lock_irq(&crtc->dev->event_lock);
286 if (crtc->state->active && drm_crtc_vblank_get(crtc) == 0)
287 drm_crtc_arm_vblank_event(crtc, event);
288 else
289 drm_crtc_send_vblank_event(crtc, event);
290 spin_unlock_irq(&crtc->dev->event_lock);
291 }
292 }
293
tve200_display_enable_vblank(struct drm_simple_display_pipe * pipe)294 static int tve200_display_enable_vblank(struct drm_simple_display_pipe *pipe)
295 {
296 struct drm_crtc *crtc = &pipe->crtc;
297 struct drm_device *drm = crtc->dev;
298 struct tve200_drm_dev_private *priv = drm->dev_private;
299
300 /* Clear any IRQs and enable */
301 writel(0xFF, priv->regs + TVE200_INT_CLR);
302 writel(TVE200_INT_V_STATUS, priv->regs + TVE200_INT_EN);
303 return 0;
304 }
305
tve200_display_disable_vblank(struct drm_simple_display_pipe * pipe)306 static void tve200_display_disable_vblank(struct drm_simple_display_pipe *pipe)
307 {
308 struct drm_crtc *crtc = &pipe->crtc;
309 struct drm_device *drm = crtc->dev;
310 struct tve200_drm_dev_private *priv = drm->dev_private;
311
312 writel(0, priv->regs + TVE200_INT_EN);
313 }
314
315 static const struct drm_simple_display_pipe_funcs tve200_display_funcs = {
316 .check = tve200_display_check,
317 .enable = tve200_display_enable,
318 .disable = tve200_display_disable,
319 .update = tve200_display_update,
320 .enable_vblank = tve200_display_enable_vblank,
321 .disable_vblank = tve200_display_disable_vblank,
322 };
323
tve200_display_init(struct drm_device * drm)324 int tve200_display_init(struct drm_device *drm)
325 {
326 struct tve200_drm_dev_private *priv = drm->dev_private;
327 int ret;
328 static const u32 formats[] = {
329 DRM_FORMAT_XRGB8888,
330 DRM_FORMAT_XBGR8888,
331 DRM_FORMAT_RGB565,
332 DRM_FORMAT_BGR565,
333 DRM_FORMAT_XRGB1555,
334 DRM_FORMAT_XBGR1555,
335 /*
336 * The controller actually supports any YCbCr ordering,
337 * for packed YCbCr. This just lists the orderings that
338 * DRM supports.
339 */
340 DRM_FORMAT_YUYV,
341 DRM_FORMAT_YVYU,
342 DRM_FORMAT_UYVY,
343 DRM_FORMAT_VYUY,
344 /* This uses three planes */
345 DRM_FORMAT_YUV420,
346 };
347
348 ret = drm_simple_display_pipe_init(drm, &priv->pipe,
349 &tve200_display_funcs,
350 formats, ARRAY_SIZE(formats),
351 NULL,
352 priv->connector);
353 if (ret)
354 return ret;
355
356 return 0;
357 }
358