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12#include <drm/drmP.h>
13#include <drm/drm_atomic.h>
14#include <drm/drm_atomic_helper.h>
15#include <drm/drm_crtc.h>
16#include <drm/drm_fb_cma_helper.h>
17#include <drm/drm_fb_helper.h>
18#include <drm/drm_gem_cma_helper.h>
19#include <drm/drm_of.h>
20#include <drm/drm_plane_helper.h>
21#include <drm/drm_probe_helper.h>
22#include <linux/clk.h>
23#include <linux/of_graph.h>
24#include <linux/platform_data/simplefb.h>
25#include <video/videomode.h>
26
27#include "hdlcd_drv.h"
28#include "hdlcd_regs.h"
29
30
31
32
33
34
35
36
37static void hdlcd_crtc_cleanup(struct drm_crtc *crtc)
38{
39 struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
40
41
42 hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 0);
43 drm_crtc_cleanup(crtc);
44}
45
46static int hdlcd_crtc_enable_vblank(struct drm_crtc *crtc)
47{
48 struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
49 unsigned int mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);
50
51 hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, mask | HDLCD_INTERRUPT_VSYNC);
52
53 return 0;
54}
55
56static void hdlcd_crtc_disable_vblank(struct drm_crtc *crtc)
57{
58 struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
59 unsigned int mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);
60
61 hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, mask & ~HDLCD_INTERRUPT_VSYNC);
62}
63
64static const struct drm_crtc_funcs hdlcd_crtc_funcs = {
65 .destroy = hdlcd_crtc_cleanup,
66 .set_config = drm_atomic_helper_set_config,
67 .page_flip = drm_atomic_helper_page_flip,
68 .reset = drm_atomic_helper_crtc_reset,
69 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
70 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
71 .enable_vblank = hdlcd_crtc_enable_vblank,
72 .disable_vblank = hdlcd_crtc_disable_vblank,
73};
74
75static struct simplefb_format supported_formats[] = SIMPLEFB_FORMATS;
76
77
78
79
80static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc)
81{
82 unsigned int btpp;
83 struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
84 const struct drm_framebuffer *fb = crtc->primary->state->fb;
85 uint32_t pixel_format;
86 struct simplefb_format *format = NULL;
87 int i;
88
89 pixel_format = fb->format->format;
90
91 for (i = 0; i < ARRAY_SIZE(supported_formats); i++) {
92 if (supported_formats[i].fourcc == pixel_format)
93 format = &supported_formats[i];
94 }
95
96 if (WARN_ON(!format))
97 return 0;
98
99
100 btpp = (format->bits_per_pixel + 7) / 8;
101 hdlcd_write(hdlcd, HDLCD_REG_PIXEL_FORMAT, (btpp - 1) << 3);
102
103
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110
111
112
113 hdlcd_write(hdlcd, HDLCD_REG_RED_SELECT, format->red.offset |
114#ifdef CONFIG_DRM_HDLCD_SHOW_UNDERRUN
115 0x00ff0000 |
116#endif
117 ((format->red.length & 0xf) << 8));
118 hdlcd_write(hdlcd, HDLCD_REG_GREEN_SELECT, format->green.offset |
119 ((format->green.length & 0xf) << 8));
120 hdlcd_write(hdlcd, HDLCD_REG_BLUE_SELECT, format->blue.offset |
121 ((format->blue.length & 0xf) << 8));
122
123 return 0;
124}
125
126static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc)
127{
128 struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
129 struct drm_display_mode *m = &crtc->state->adjusted_mode;
130 struct videomode vm;
131 unsigned int polarities, err;
132
133 vm.vfront_porch = m->crtc_vsync_start - m->crtc_vdisplay;
134 vm.vback_porch = m->crtc_vtotal - m->crtc_vsync_end;
135 vm.vsync_len = m->crtc_vsync_end - m->crtc_vsync_start;
136 vm.hfront_porch = m->crtc_hsync_start - m->crtc_hdisplay;
137 vm.hback_porch = m->crtc_htotal - m->crtc_hsync_end;
138 vm.hsync_len = m->crtc_hsync_end - m->crtc_hsync_start;
139
140 polarities = HDLCD_POLARITY_DATAEN | HDLCD_POLARITY_DATA;
141
142 if (m->flags & DRM_MODE_FLAG_PHSYNC)
143 polarities |= HDLCD_POLARITY_HSYNC;
144 if (m->flags & DRM_MODE_FLAG_PVSYNC)
145 polarities |= HDLCD_POLARITY_VSYNC;
146
147
148 hdlcd_write(hdlcd, HDLCD_REG_BUS_OPTIONS,
149 HDLCD_BUS_MAX_OUTSTAND | HDLCD_BUS_BURST_16);
150
151 hdlcd_write(hdlcd, HDLCD_REG_V_DATA, m->crtc_vdisplay - 1);
152 hdlcd_write(hdlcd, HDLCD_REG_V_BACK_PORCH, vm.vback_porch - 1);
153 hdlcd_write(hdlcd, HDLCD_REG_V_FRONT_PORCH, vm.vfront_porch - 1);
154 hdlcd_write(hdlcd, HDLCD_REG_V_SYNC, vm.vsync_len - 1);
155 hdlcd_write(hdlcd, HDLCD_REG_H_DATA, m->crtc_hdisplay - 1);
156 hdlcd_write(hdlcd, HDLCD_REG_H_BACK_PORCH, vm.hback_porch - 1);
157 hdlcd_write(hdlcd, HDLCD_REG_H_FRONT_PORCH, vm.hfront_porch - 1);
158 hdlcd_write(hdlcd, HDLCD_REG_H_SYNC, vm.hsync_len - 1);
159 hdlcd_write(hdlcd, HDLCD_REG_POLARITIES, polarities);
160
161 err = hdlcd_set_pxl_fmt(crtc);
162 if (err)
163 return;
164
165 clk_set_rate(hdlcd->clk, m->crtc_clock * 1000);
166}
167
168static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc,
169 struct drm_crtc_state *old_state)
170{
171 struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
172
173 clk_prepare_enable(hdlcd->clk);
174 hdlcd_crtc_mode_set_nofb(crtc);
175 hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1);
176 drm_crtc_vblank_on(crtc);
177}
178
179static void hdlcd_crtc_atomic_disable(struct drm_crtc *crtc,
180 struct drm_crtc_state *old_state)
181{
182 struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
183
184 drm_crtc_vblank_off(crtc);
185 hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 0);
186 clk_disable_unprepare(hdlcd->clk);
187}
188
189static enum drm_mode_status hdlcd_crtc_mode_valid(struct drm_crtc *crtc,
190 const struct drm_display_mode *mode)
191{
192 struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
193 long rate, clk_rate = mode->clock * 1000;
194
195 rate = clk_round_rate(hdlcd->clk, clk_rate);
196
197 if (abs(rate - clk_rate) * 1000 > clk_rate) {
198
199 return MODE_NOCLOCK;
200 }
201
202 return MODE_OK;
203}
204
205static void hdlcd_crtc_atomic_begin(struct drm_crtc *crtc,
206 struct drm_crtc_state *state)
207{
208 struct drm_pending_vblank_event *event = crtc->state->event;
209
210 if (event) {
211 crtc->state->event = NULL;
212
213 spin_lock_irq(&crtc->dev->event_lock);
214 if (drm_crtc_vblank_get(crtc) == 0)
215 drm_crtc_arm_vblank_event(crtc, event);
216 else
217 drm_crtc_send_vblank_event(crtc, event);
218 spin_unlock_irq(&crtc->dev->event_lock);
219 }
220}
221
222static const struct drm_crtc_helper_funcs hdlcd_crtc_helper_funcs = {
223 .mode_valid = hdlcd_crtc_mode_valid,
224 .atomic_begin = hdlcd_crtc_atomic_begin,
225 .atomic_enable = hdlcd_crtc_atomic_enable,
226 .atomic_disable = hdlcd_crtc_atomic_disable,
227};
228
229static int hdlcd_plane_atomic_check(struct drm_plane *plane,
230 struct drm_plane_state *state)
231{
232 int i;
233 struct drm_crtc *crtc;
234 struct drm_crtc_state *crtc_state;
235 u32 src_h = state->src_h >> 16;
236
237
238 if (src_h >= HDLCD_MAX_YRES) {
239 DRM_DEBUG_KMS("Invalid source width: %d\n", src_h);
240 return -EINVAL;
241 }
242
243 for_each_new_crtc_in_state(state->state, crtc, crtc_state, i) {
244
245 if (!state->fb && crtc_state->active)
246 return -EINVAL;
247 return drm_atomic_helper_check_plane_state(state, crtc_state,
248 DRM_PLANE_HELPER_NO_SCALING,
249 DRM_PLANE_HELPER_NO_SCALING,
250 false, true);
251 }
252
253 return 0;
254}
255
256static void hdlcd_plane_atomic_update(struct drm_plane *plane,
257 struct drm_plane_state *state)
258{
259 struct drm_framebuffer *fb = plane->state->fb;
260 struct hdlcd_drm_private *hdlcd;
261 u32 dest_h;
262 dma_addr_t scanout_start;
263
264 if (!fb)
265 return;
266
267 dest_h = drm_rect_height(&plane->state->dst);
268 scanout_start = drm_fb_cma_get_gem_addr(fb, plane->state, 0);
269
270 hdlcd = plane->dev->dev_private;
271 hdlcd_write(hdlcd, HDLCD_REG_FB_LINE_LENGTH, fb->pitches[0]);
272 hdlcd_write(hdlcd, HDLCD_REG_FB_LINE_PITCH, fb->pitches[0]);
273 hdlcd_write(hdlcd, HDLCD_REG_FB_LINE_COUNT, dest_h - 1);
274 hdlcd_write(hdlcd, HDLCD_REG_FB_BASE, scanout_start);
275}
276
277static const struct drm_plane_helper_funcs hdlcd_plane_helper_funcs = {
278 .atomic_check = hdlcd_plane_atomic_check,
279 .atomic_update = hdlcd_plane_atomic_update,
280};
281
282static const struct drm_plane_funcs hdlcd_plane_funcs = {
283 .update_plane = drm_atomic_helper_update_plane,
284 .disable_plane = drm_atomic_helper_disable_plane,
285 .destroy = drm_plane_cleanup,
286 .reset = drm_atomic_helper_plane_reset,
287 .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
288 .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
289};
290
291static struct drm_plane *hdlcd_plane_init(struct drm_device *drm)
292{
293 struct hdlcd_drm_private *hdlcd = drm->dev_private;
294 struct drm_plane *plane = NULL;
295 u32 formats[ARRAY_SIZE(supported_formats)], i;
296 int ret;
297
298 plane = devm_kzalloc(drm->dev, sizeof(*plane), GFP_KERNEL);
299 if (!plane)
300 return ERR_PTR(-ENOMEM);
301
302 for (i = 0; i < ARRAY_SIZE(supported_formats); i++)
303 formats[i] = supported_formats[i].fourcc;
304
305 ret = drm_universal_plane_init(drm, plane, 0xff, &hdlcd_plane_funcs,
306 formats, ARRAY_SIZE(formats),
307 NULL,
308 DRM_PLANE_TYPE_PRIMARY, NULL);
309 if (ret)
310 return ERR_PTR(ret);
311
312 drm_plane_helper_add(plane, &hdlcd_plane_helper_funcs);
313 hdlcd->plane = plane;
314
315 return plane;
316}
317
318int hdlcd_setup_crtc(struct drm_device *drm)
319{
320 struct hdlcd_drm_private *hdlcd = drm->dev_private;
321 struct drm_plane *primary;
322 int ret;
323
324 primary = hdlcd_plane_init(drm);
325 if (IS_ERR(primary))
326 return PTR_ERR(primary);
327
328 ret = drm_crtc_init_with_planes(drm, &hdlcd->crtc, primary, NULL,
329 &hdlcd_crtc_funcs, NULL);
330 if (ret)
331 return ret;
332
333 drm_crtc_helper_add(&hdlcd->crtc, &hdlcd_crtc_helper_funcs);
334 return 0;
335}
336