1 /*
2 * ARC PGU DRM driver.
3 *
4 * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 */
16
17 #include <drm/drm_atomic_helper.h>
18 #include <drm/drm_crtc_helper.h>
19 #include <drm/drm_fb_cma_helper.h>
20 #include <drm/drm_gem_cma_helper.h>
21 #include <drm/drm_plane_helper.h>
22 #include <linux/clk.h>
23 #include <linux/platform_data/simplefb.h>
24
25 #include "arcpgu.h"
26 #include "arcpgu_regs.h"
27
28 #define ENCODE_PGU_XY(x, y) ((((x) - 1) << 16) | ((y) - 1))
29
30 static struct simplefb_format supported_formats[] = {
31 { "r5g6b5", 16, {11, 5}, {5, 6}, {0, 5}, {0, 0}, DRM_FORMAT_RGB565 },
32 { "r8g8b8", 24, {16, 8}, {8, 8}, {0, 8}, {0, 0}, DRM_FORMAT_RGB888 },
33 };
34
arc_pgu_set_pxl_fmt(struct drm_crtc * crtc)35 static void arc_pgu_set_pxl_fmt(struct drm_crtc *crtc)
36 {
37 struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
38 const struct drm_framebuffer *fb = crtc->primary->state->fb;
39 uint32_t pixel_format = fb->format->format;
40 struct simplefb_format *format = NULL;
41 int i;
42
43 for (i = 0; i < ARRAY_SIZE(supported_formats); i++) {
44 if (supported_formats[i].fourcc == pixel_format)
45 format = &supported_formats[i];
46 }
47
48 if (WARN_ON(!format))
49 return;
50
51 if (format->fourcc == DRM_FORMAT_RGB888)
52 arc_pgu_write(arcpgu, ARCPGU_REG_CTRL,
53 arc_pgu_read(arcpgu, ARCPGU_REG_CTRL) |
54 ARCPGU_MODE_RGB888_MASK);
55
56 }
57
58 static const struct drm_crtc_funcs arc_pgu_crtc_funcs = {
59 .destroy = drm_crtc_cleanup,
60 .set_config = drm_atomic_helper_set_config,
61 .page_flip = drm_atomic_helper_page_flip,
62 .reset = drm_atomic_helper_crtc_reset,
63 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
64 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
65 };
66
arc_pgu_crtc_mode_valid(struct drm_crtc * crtc,const struct drm_display_mode * mode)67 static enum drm_mode_status arc_pgu_crtc_mode_valid(struct drm_crtc *crtc,
68 const struct drm_display_mode *mode)
69 {
70 struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
71 long rate, clk_rate = mode->clock * 1000;
72 long diff = clk_rate / 200; /* +-0.5% allowed by HDMI spec */
73
74 rate = clk_round_rate(arcpgu->clk, clk_rate);
75 if ((max(rate, clk_rate) - min(rate, clk_rate) < diff) && (rate > 0))
76 return MODE_OK;
77
78 return MODE_NOCLOCK;
79 }
80
arc_pgu_crtc_mode_set_nofb(struct drm_crtc * crtc)81 static void arc_pgu_crtc_mode_set_nofb(struct drm_crtc *crtc)
82 {
83 struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
84 struct drm_display_mode *m = &crtc->state->adjusted_mode;
85 u32 val;
86
87 arc_pgu_write(arcpgu, ARCPGU_REG_FMT,
88 ENCODE_PGU_XY(m->crtc_htotal, m->crtc_vtotal));
89
90 arc_pgu_write(arcpgu, ARCPGU_REG_HSYNC,
91 ENCODE_PGU_XY(m->crtc_hsync_start - m->crtc_hdisplay,
92 m->crtc_hsync_end - m->crtc_hdisplay));
93
94 arc_pgu_write(arcpgu, ARCPGU_REG_VSYNC,
95 ENCODE_PGU_XY(m->crtc_vsync_start - m->crtc_vdisplay,
96 m->crtc_vsync_end - m->crtc_vdisplay));
97
98 arc_pgu_write(arcpgu, ARCPGU_REG_ACTIVE,
99 ENCODE_PGU_XY(m->crtc_hblank_end - m->crtc_hblank_start,
100 m->crtc_vblank_end - m->crtc_vblank_start));
101
102 val = arc_pgu_read(arcpgu, ARCPGU_REG_CTRL);
103
104 if (m->flags & DRM_MODE_FLAG_PVSYNC)
105 val |= ARCPGU_CTRL_VS_POL_MASK << ARCPGU_CTRL_VS_POL_OFST;
106 else
107 val &= ~(ARCPGU_CTRL_VS_POL_MASK << ARCPGU_CTRL_VS_POL_OFST);
108
109 if (m->flags & DRM_MODE_FLAG_PHSYNC)
110 val |= ARCPGU_CTRL_HS_POL_MASK << ARCPGU_CTRL_HS_POL_OFST;
111 else
112 val &= ~(ARCPGU_CTRL_HS_POL_MASK << ARCPGU_CTRL_HS_POL_OFST);
113
114 arc_pgu_write(arcpgu, ARCPGU_REG_CTRL, val);
115 arc_pgu_write(arcpgu, ARCPGU_REG_STRIDE, 0);
116 arc_pgu_write(arcpgu, ARCPGU_REG_START_SET, 1);
117
118 arc_pgu_set_pxl_fmt(crtc);
119
120 clk_set_rate(arcpgu->clk, m->crtc_clock * 1000);
121 }
122
arc_pgu_crtc_atomic_enable(struct drm_crtc * crtc,struct drm_crtc_state * old_state)123 static void arc_pgu_crtc_atomic_enable(struct drm_crtc *crtc,
124 struct drm_crtc_state *old_state)
125 {
126 struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
127
128 clk_prepare_enable(arcpgu->clk);
129 arc_pgu_write(arcpgu, ARCPGU_REG_CTRL,
130 arc_pgu_read(arcpgu, ARCPGU_REG_CTRL) |
131 ARCPGU_CTRL_ENABLE_MASK);
132 }
133
arc_pgu_crtc_atomic_disable(struct drm_crtc * crtc,struct drm_crtc_state * old_state)134 static void arc_pgu_crtc_atomic_disable(struct drm_crtc *crtc,
135 struct drm_crtc_state *old_state)
136 {
137 struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
138
139 clk_disable_unprepare(arcpgu->clk);
140 arc_pgu_write(arcpgu, ARCPGU_REG_CTRL,
141 arc_pgu_read(arcpgu, ARCPGU_REG_CTRL) &
142 ~ARCPGU_CTRL_ENABLE_MASK);
143 }
144
arc_pgu_crtc_atomic_begin(struct drm_crtc * crtc,struct drm_crtc_state * state)145 static void arc_pgu_crtc_atomic_begin(struct drm_crtc *crtc,
146 struct drm_crtc_state *state)
147 {
148 struct drm_pending_vblank_event *event = crtc->state->event;
149
150 if (event) {
151 crtc->state->event = NULL;
152
153 spin_lock_irq(&crtc->dev->event_lock);
154 drm_crtc_send_vblank_event(crtc, event);
155 spin_unlock_irq(&crtc->dev->event_lock);
156 }
157 }
158
159 static const struct drm_crtc_helper_funcs arc_pgu_crtc_helper_funcs = {
160 .mode_valid = arc_pgu_crtc_mode_valid,
161 .mode_set = drm_helper_crtc_mode_set,
162 .mode_set_base = drm_helper_crtc_mode_set_base,
163 .mode_set_nofb = arc_pgu_crtc_mode_set_nofb,
164 .atomic_begin = arc_pgu_crtc_atomic_begin,
165 .atomic_enable = arc_pgu_crtc_atomic_enable,
166 .atomic_disable = arc_pgu_crtc_atomic_disable,
167 };
168
arc_pgu_plane_atomic_update(struct drm_plane * plane,struct drm_plane_state * state)169 static void arc_pgu_plane_atomic_update(struct drm_plane *plane,
170 struct drm_plane_state *state)
171 {
172 struct arcpgu_drm_private *arcpgu;
173 struct drm_gem_cma_object *gem;
174
175 if (!plane->state->crtc || !plane->state->fb)
176 return;
177
178 arcpgu = crtc_to_arcpgu_priv(plane->state->crtc);
179 gem = drm_fb_cma_get_gem_obj(plane->state->fb, 0);
180 arc_pgu_write(arcpgu, ARCPGU_REG_BUF0_ADDR, gem->paddr);
181 }
182
183 static const struct drm_plane_helper_funcs arc_pgu_plane_helper_funcs = {
184 .atomic_update = arc_pgu_plane_atomic_update,
185 };
186
arc_pgu_plane_destroy(struct drm_plane * plane)187 static void arc_pgu_plane_destroy(struct drm_plane *plane)
188 {
189 drm_plane_helper_disable(plane, NULL);
190 drm_plane_cleanup(plane);
191 }
192
193 static const struct drm_plane_funcs arc_pgu_plane_funcs = {
194 .update_plane = drm_atomic_helper_update_plane,
195 .disable_plane = drm_atomic_helper_disable_plane,
196 .destroy = arc_pgu_plane_destroy,
197 .reset = drm_atomic_helper_plane_reset,
198 .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
199 .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
200 };
201
arc_pgu_plane_init(struct drm_device * drm)202 static struct drm_plane *arc_pgu_plane_init(struct drm_device *drm)
203 {
204 struct arcpgu_drm_private *arcpgu = drm->dev_private;
205 struct drm_plane *plane = NULL;
206 u32 formats[ARRAY_SIZE(supported_formats)], i;
207 int ret;
208
209 plane = devm_kzalloc(drm->dev, sizeof(*plane), GFP_KERNEL);
210 if (!plane)
211 return ERR_PTR(-ENOMEM);
212
213 for (i = 0; i < ARRAY_SIZE(supported_formats); i++)
214 formats[i] = supported_formats[i].fourcc;
215
216 ret = drm_universal_plane_init(drm, plane, 0xff, &arc_pgu_plane_funcs,
217 formats, ARRAY_SIZE(formats),
218 NULL,
219 DRM_PLANE_TYPE_PRIMARY, NULL);
220 if (ret)
221 return ERR_PTR(ret);
222
223 drm_plane_helper_add(plane, &arc_pgu_plane_helper_funcs);
224 arcpgu->plane = plane;
225
226 return plane;
227 }
228
arc_pgu_setup_crtc(struct drm_device * drm)229 int arc_pgu_setup_crtc(struct drm_device *drm)
230 {
231 struct arcpgu_drm_private *arcpgu = drm->dev_private;
232 struct drm_plane *primary;
233 int ret;
234
235 primary = arc_pgu_plane_init(drm);
236 if (IS_ERR(primary))
237 return PTR_ERR(primary);
238
239 ret = drm_crtc_init_with_planes(drm, &arcpgu->crtc, primary, NULL,
240 &arc_pgu_crtc_funcs, NULL);
241 if (ret) {
242 arc_pgu_plane_destroy(primary);
243 return ret;
244 }
245
246 drm_crtc_helper_add(&arcpgu->crtc, &arc_pgu_crtc_helper_funcs);
247 return 0;
248 }
249
