1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <linux/delay.h>
4 #include <linux/pci.h>
5
6 #include <drm/drm_atomic.h>
7 #include <drm/drm_atomic_helper.h>
8 #include <drm/drm_drv.h>
9 #include <drm/drm_gem_atomic_helper.h>
10 #include <drm/drm_probe_helper.h>
11
12 #include "mgag200_drv.h"
13
mgag200_g200eh_init_registers(struct mga_device * mdev)14 void mgag200_g200eh_init_registers(struct mga_device *mdev)
15 {
16 static const u8 dacvalue[] = {
17 MGAG200_DAC_DEFAULT(0x00, 0xc9,
18 MGA1064_MISC_CTL_VGA8 | MGA1064_MISC_CTL_DAC_RAM_CS,
19 0x00, 0x00, 0x00)
20 };
21
22 size_t i;
23
24 for (i = 0; i < ARRAY_SIZE(dacvalue); i++) {
25 if ((i <= 0x17) ||
26 (i == 0x1b) ||
27 (i == 0x1c) ||
28 ((i >= 0x1f) && (i <= 0x29)) ||
29 ((i >= 0x30) && (i <= 0x37)) ||
30 ((i >= 0x44) && (i <= 0x4e)))
31 continue;
32 WREG_DAC(i, dacvalue[i]);
33 }
34
35 mgag200_init_registers(mdev);
36 }
37
38 /*
39 * PIXPLLC
40 */
41
mgag200_g200eh_pixpllc_atomic_check(struct drm_crtc * crtc,struct drm_atomic_state * new_state)42 static int mgag200_g200eh_pixpllc_atomic_check(struct drm_crtc *crtc,
43 struct drm_atomic_state *new_state)
44 {
45 static const unsigned int vcomax = 800000;
46 static const unsigned int vcomin = 400000;
47 static const unsigned int pllreffreq = 33333;
48
49 struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(new_state, crtc);
50 struct mgag200_crtc_state *new_mgag200_crtc_state = to_mgag200_crtc_state(new_crtc_state);
51 long clock = new_crtc_state->mode.clock;
52 struct mgag200_pll_values *pixpllc = &new_mgag200_crtc_state->pixpllc;
53 unsigned int delta, tmpdelta;
54 unsigned int testp, testm, testn;
55 unsigned int p, m, n, s;
56 unsigned int computed;
57
58 m = n = p = s = 0;
59 delta = 0xffffffff;
60
61 for (testp = 16; testp > 0; testp >>= 1) {
62 if (clock * testp > vcomax)
63 continue;
64 if (clock * testp < vcomin)
65 continue;
66
67 for (testm = 1; testm < 33; testm++) {
68 for (testn = 17; testn < 257; testn++) {
69 computed = (pllreffreq * testn) / (testm * testp);
70 if (computed > clock)
71 tmpdelta = computed - clock;
72 else
73 tmpdelta = clock - computed;
74 if (tmpdelta < delta) {
75 delta = tmpdelta;
76 n = testn;
77 m = testm;
78 p = testp;
79 }
80 }
81 }
82 }
83
84 pixpllc->m = m;
85 pixpllc->n = n;
86 pixpllc->p = p;
87 pixpllc->s = s;
88
89 return 0;
90 }
91
mgag200_g200eh_pixpllc_atomic_update(struct drm_crtc * crtc,struct drm_atomic_state * old_state)92 void mgag200_g200eh_pixpllc_atomic_update(struct drm_crtc *crtc,
93 struct drm_atomic_state *old_state)
94 {
95 struct drm_device *dev = crtc->dev;
96 struct mga_device *mdev = to_mga_device(dev);
97 struct drm_crtc_state *crtc_state = crtc->state;
98 struct mgag200_crtc_state *mgag200_crtc_state = to_mgag200_crtc_state(crtc_state);
99 struct mgag200_pll_values *pixpllc = &mgag200_crtc_state->pixpllc;
100 unsigned int pixpllcm, pixpllcn, pixpllcp, pixpllcs;
101 u8 xpixpllcm, xpixpllcn, xpixpllcp, tmp;
102 int i, j, tmpcount, vcount;
103 bool pll_locked = false;
104
105 pixpllcm = pixpllc->m - 1;
106 pixpllcn = pixpllc->n - 1;
107 pixpllcp = pixpllc->p - 1;
108 pixpllcs = pixpllc->s;
109
110 xpixpllcm = ((pixpllcn & BIT(8)) >> 1) | pixpllcm;
111 xpixpllcn = pixpllcn;
112 xpixpllcp = (pixpllcs << 3) | pixpllcp;
113
114 WREG_MISC_MASKED(MGAREG_MISC_CLKSEL_MGA, MGAREG_MISC_CLKSEL_MASK);
115
116 for (i = 0; i <= 32 && pll_locked == false; i++) {
117 WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
118 tmp = RREG8(DAC_DATA);
119 tmp |= MGA1064_PIX_CLK_CTL_CLK_DIS;
120 WREG8(DAC_DATA, tmp);
121
122 tmp = RREG8(MGAREG_MEM_MISC_READ);
123 tmp |= 0x3 << 2;
124 WREG8(MGAREG_MEM_MISC_WRITE, tmp);
125
126 WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
127 tmp = RREG8(DAC_DATA);
128 tmp |= MGA1064_PIX_CLK_CTL_CLK_POW_DOWN;
129 WREG8(DAC_DATA, tmp);
130
131 udelay(500);
132
133 WREG_DAC(MGA1064_EH_PIX_PLLC_M, xpixpllcm);
134 WREG_DAC(MGA1064_EH_PIX_PLLC_N, xpixpllcn);
135 WREG_DAC(MGA1064_EH_PIX_PLLC_P, xpixpllcp);
136
137 udelay(500);
138
139 WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
140 tmp = RREG8(DAC_DATA);
141 tmp &= ~MGA1064_PIX_CLK_CTL_SEL_MSK;
142 tmp |= MGA1064_PIX_CLK_CTL_SEL_PLL;
143 WREG8(DAC_DATA, tmp);
144
145 WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
146 tmp = RREG8(DAC_DATA);
147 tmp &= ~MGA1064_PIX_CLK_CTL_CLK_DIS;
148 tmp &= ~MGA1064_PIX_CLK_CTL_CLK_POW_DOWN;
149 WREG8(DAC_DATA, tmp);
150
151 vcount = RREG8(MGAREG_VCOUNT);
152
153 for (j = 0; j < 30 && pll_locked == false; j++) {
154 tmpcount = RREG8(MGAREG_VCOUNT);
155 if (tmpcount < vcount)
156 vcount = 0;
157 if ((tmpcount - vcount) > 2)
158 pll_locked = true;
159 else
160 udelay(5);
161 }
162 }
163 }
164
165 /*
166 * Mode-setting pipeline
167 */
168
169 static const struct drm_plane_helper_funcs mgag200_g200eh_primary_plane_helper_funcs = {
170 MGAG200_PRIMARY_PLANE_HELPER_FUNCS,
171 };
172
173 static const struct drm_plane_funcs mgag200_g200eh_primary_plane_funcs = {
174 MGAG200_PRIMARY_PLANE_FUNCS,
175 };
176
177 static const struct drm_crtc_helper_funcs mgag200_g200eh_crtc_helper_funcs = {
178 MGAG200_CRTC_HELPER_FUNCS,
179 };
180
181 static const struct drm_crtc_funcs mgag200_g200eh_crtc_funcs = {
182 MGAG200_CRTC_FUNCS,
183 };
184
185 static const struct drm_encoder_funcs mgag200_g200eh_dac_encoder_funcs = {
186 MGAG200_DAC_ENCODER_FUNCS,
187 };
188
189 static const struct drm_connector_helper_funcs mgag200_g200eh_vga_connector_helper_funcs = {
190 MGAG200_VGA_CONNECTOR_HELPER_FUNCS,
191 };
192
193 static const struct drm_connector_funcs mgag200_g200eh_vga_connector_funcs = {
194 MGAG200_VGA_CONNECTOR_FUNCS,
195 };
196
mgag200_g200eh_pipeline_init(struct mga_device * mdev)197 static int mgag200_g200eh_pipeline_init(struct mga_device *mdev)
198 {
199 struct drm_device *dev = &mdev->base;
200 struct drm_plane *primary_plane = &mdev->primary_plane;
201 struct drm_crtc *crtc = &mdev->crtc;
202 struct drm_encoder *encoder = &mdev->encoder;
203 struct mga_i2c_chan *i2c = &mdev->i2c;
204 struct drm_connector *connector = &mdev->connector;
205 int ret;
206
207 ret = drm_universal_plane_init(dev, primary_plane, 0,
208 &mgag200_g200eh_primary_plane_funcs,
209 mgag200_primary_plane_formats,
210 mgag200_primary_plane_formats_size,
211 mgag200_primary_plane_fmtmods,
212 DRM_PLANE_TYPE_PRIMARY, NULL);
213 if (ret) {
214 drm_err(dev, "drm_universal_plane_init() failed: %d\n", ret);
215 return ret;
216 }
217 drm_plane_helper_add(primary_plane, &mgag200_g200eh_primary_plane_helper_funcs);
218 drm_plane_enable_fb_damage_clips(primary_plane);
219
220 ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
221 &mgag200_g200eh_crtc_funcs, NULL);
222 if (ret) {
223 drm_err(dev, "drm_crtc_init_with_planes() failed: %d\n", ret);
224 return ret;
225 }
226 drm_crtc_helper_add(crtc, &mgag200_g200eh_crtc_helper_funcs);
227
228 /* FIXME: legacy gamma tables, but atomic gamma doesn't work without */
229 drm_mode_crtc_set_gamma_size(crtc, MGAG200_LUT_SIZE);
230 drm_crtc_enable_color_mgmt(crtc, 0, false, MGAG200_LUT_SIZE);
231
232 encoder->possible_crtcs = drm_crtc_mask(crtc);
233 ret = drm_encoder_init(dev, encoder, &mgag200_g200eh_dac_encoder_funcs,
234 DRM_MODE_ENCODER_DAC, NULL);
235 if (ret) {
236 drm_err(dev, "drm_encoder_init() failed: %d\n", ret);
237 return ret;
238 }
239
240 ret = mgag200_i2c_init(mdev, i2c);
241 if (ret) {
242 drm_err(dev, "failed to add DDC bus: %d\n", ret);
243 return ret;
244 }
245
246 ret = drm_connector_init_with_ddc(dev, connector,
247 &mgag200_g200eh_vga_connector_funcs,
248 DRM_MODE_CONNECTOR_VGA,
249 &i2c->adapter);
250 if (ret) {
251 drm_err(dev, "drm_connector_init_with_ddc() failed: %d\n", ret);
252 return ret;
253 }
254 drm_connector_helper_add(connector, &mgag200_g200eh_vga_connector_helper_funcs);
255
256 ret = drm_connector_attach_encoder(connector, encoder);
257 if (ret) {
258 drm_err(dev, "drm_connector_attach_encoder() failed: %d\n", ret);
259 return ret;
260 }
261
262 return 0;
263 }
264
265 /*
266 * DRM device
267 */
268
269 static const struct mgag200_device_info mgag200_g200eh_device_info =
270 MGAG200_DEVICE_INFO_INIT(2048, 2048, 37500, false, 1, 0, false);
271
272 static const struct mgag200_device_funcs mgag200_g200eh_device_funcs = {
273 .pixpllc_atomic_check = mgag200_g200eh_pixpllc_atomic_check,
274 .pixpllc_atomic_update = mgag200_g200eh_pixpllc_atomic_update,
275 };
276
mgag200_g200eh_device_create(struct pci_dev * pdev,const struct drm_driver * drv)277 struct mga_device *mgag200_g200eh_device_create(struct pci_dev *pdev, const struct drm_driver *drv)
278 {
279 struct mga_device *mdev;
280 struct drm_device *dev;
281 resource_size_t vram_available;
282 int ret;
283
284 mdev = devm_drm_dev_alloc(&pdev->dev, drv, struct mga_device, base);
285 if (IS_ERR(mdev))
286 return mdev;
287 dev = &mdev->base;
288
289 pci_set_drvdata(pdev, dev);
290
291 ret = mgag200_init_pci_options(pdev, 0x00000120, 0x0000b000);
292 if (ret)
293 return ERR_PTR(ret);
294
295 ret = mgag200_device_preinit(mdev);
296 if (ret)
297 return ERR_PTR(ret);
298
299 ret = mgag200_device_init(mdev, &mgag200_g200eh_device_info,
300 &mgag200_g200eh_device_funcs);
301 if (ret)
302 return ERR_PTR(ret);
303
304 mgag200_g200eh_init_registers(mdev);
305
306 vram_available = mgag200_device_probe_vram(mdev);
307
308 ret = mgag200_mode_config_init(mdev, vram_available);
309 if (ret)
310 return ERR_PTR(ret);
311
312 ret = mgag200_g200eh_pipeline_init(mdev);
313 if (ret)
314 return ERR_PTR(ret);
315
316 drm_mode_config_reset(dev);
317
318 return mdev;
319 }
320