drivers/gpu/drm/mgag200/mgag200_g200er.c

   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
  14 static void mgag200_g200er_init_registers(struct mga_device *mdev)
  15 {
  16         static const u8 dacvalue[] = {
  17                 MGAG200_DAC_DEFAULT(0x00, 0xc9, 0x1f, 0x00, 0x00, 0x00)
  18         };
  19
  20         size_t i;
  21
  22         for (i = 0; i < ARRAY_SIZE(dacvalue); i++) {
  23                 if ((i <= 0x17) ||
  24                     (i == 0x1b) ||
  25                     (i == 0x1c) ||
  26                     ((i >= 0x1f) && (i <= 0x29)) ||
  27                     ((i >= 0x30) && (i <= 0x37)))
  28                         continue;
  29                 WREG_DAC(i, dacvalue[i]);
  30         }
  31
  32         WREG_DAC(0x90, 0); /* G200ER specific */
  33
  34         mgag200_init_registers(mdev);
  35
  36         WREG_ECRT(0x24, 0x5); /* G200ER specific */
  37 }
  38
  39 static void mgag200_g200er_reset_tagfifo(struct mga_device *mdev)
  40 {
  41         static const uint32_t RESET_FLAG = 0x00200000; /* undocumented magic value */
  42         u32 memctl;
  43
  44         memctl = RREG32(MGAREG_MEMCTL);
  45
  46         memctl |= RESET_FLAG;
  47         WREG32(MGAREG_MEMCTL, memctl);
  48
  49         udelay(1000);
  50
  51         memctl &= ~RESET_FLAG;
  52         WREG32(MGAREG_MEMCTL, memctl);
  53 }
  54
  55 /*
  56  * PIXPLLC
  57  */
  58
  59 static int mgag200_g200er_pixpllc_atomic_check(struct drm_crtc *crtc,
  60                                                struct drm_atomic_state *new_state)
  61 {
  62         static const unsigned int vcomax = 1488000;
  63         static const unsigned int vcomin = 1056000;
  64         static const unsigned int pllreffreq = 48000;
  65         static const unsigned int m_div_val[] = { 1, 2, 4, 8 };
  66
  67         struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(new_state, crtc);
  68         struct mgag200_crtc_state *new_mgag200_crtc_state = to_mgag200_crtc_state(new_crtc_state);
  69         long clock = new_crtc_state->mode.clock;
  70         struct mgag200_pll_values *pixpllc = &new_mgag200_crtc_state->pixpllc;
  71         unsigned int delta, tmpdelta;
  72         int testr, testn, testm, testo;
  73         unsigned int p, m, n, s;
  74         unsigned int computed, vco;
  75
  76         m = n = p = s = 0;
  77         delta = 0xffffffff;
  78
  79         for (testr = 0; testr < 4; testr++) {
  80                 if (delta == 0)
  81                         break;
  82                 for (testn = 5; testn < 129; testn++) {
  83                         if (delta == 0)
  84                                 break;
  85                         for (testm = 3; testm >= 0; testm--) {
  86                                 if (delta == 0)
  87                                         break;
  88                                 for (testo = 5; testo < 33; testo++) {
  89                                         vco = pllreffreq * (testn + 1) /
  90                                                 (testr + 1);
  91                                         if (vco < vcomin)
  92                                                 continue;
  93                                         if (vco > vcomax)
  94                                                 continue;
  95                                         computed = vco / (m_div_val[testm] * (testo + 1));
  96                                         if (computed > clock)
  97                                                 tmpdelta = computed - clock;
  98                                         else
  99                                                 tmpdelta = clock - computed;
 100                                         if (tmpdelta < delta) {
 101                                                 delta = tmpdelta;
 102                                                 m = (testm | (testo << 3)) + 1;
 103                                                 n = testn + 1;
 104                                                 p = testr + 1;
 105                                                 s = testr;
 106                                         }
 107                                 }
 108                         }
 109                 }
 110         }
 111
 112         pixpllc->m = m;
 113         pixpllc->n = n;
 114         pixpllc->p = p;
 115         pixpllc->s = s;
 116
 117         return 0;
 118 }
 119
 120 static void mgag200_g200er_pixpllc_atomic_update(struct drm_crtc *crtc,
 121                                                  struct drm_atomic_state *old_state)
 122 {
 123         struct drm_device *dev = crtc->dev;
 124         struct mga_device *mdev = to_mga_device(dev);
 125         struct drm_crtc_state *crtc_state = crtc->state;
 126         struct mgag200_crtc_state *mgag200_crtc_state = to_mgag200_crtc_state(crtc_state);
 127         struct mgag200_pll_values *pixpllc = &mgag200_crtc_state->pixpllc;
 128         unsigned int pixpllcm, pixpllcn, pixpllcp, pixpllcs;
 129         u8 xpixpllcm, xpixpllcn, xpixpllcp, tmp;
 130
 131         pixpllcm = pixpllc->m - 1;
 132         pixpllcn = pixpllc->n - 1;
 133         pixpllcp = pixpllc->p - 1;
 134         pixpllcs = pixpllc->s;
 135
 136         xpixpllcm = pixpllcm;
 137         xpixpllcn = pixpllcn;
 138         xpixpllcp = (pixpllcs << 3) | pixpllcp;
 139
 140         WREG_MISC_MASKED(MGAREG_MISC_CLKSEL_MGA, MGAREG_MISC_CLKSEL_MASK);
 141
 142         WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
 143         tmp = RREG8(DAC_DATA);
 144         tmp |= MGA1064_PIX_CLK_CTL_CLK_DIS;
 145         WREG8(DAC_DATA, tmp);
 146
 147         WREG8(DAC_INDEX, MGA1064_REMHEADCTL);
 148         tmp = RREG8(DAC_DATA);
 149         tmp |= MGA1064_REMHEADCTL_CLKDIS;
 150         WREG8(DAC_DATA, tmp);
 151
 152         tmp = RREG8(MGAREG_MEM_MISC_READ);
 153         tmp |= (0x3<<2) | 0xc0;
 154         WREG8(MGAREG_MEM_MISC_WRITE, tmp);
 155
 156         WREG8(DAC_INDEX, MGA1064_PIX_CLK_CTL);
 157         tmp = RREG8(DAC_DATA);
 158         tmp &= ~MGA1064_PIX_CLK_CTL_CLK_DIS;
 159         tmp |= MGA1064_PIX_CLK_CTL_CLK_POW_DOWN;
 160         WREG8(DAC_DATA, tmp);
 161
 162         udelay(500);
 163
 164         WREG_DAC(MGA1064_ER_PIX_PLLC_N, xpixpllcn);
 165         WREG_DAC(MGA1064_ER_PIX_PLLC_M, xpixpllcm);
 166         WREG_DAC(MGA1064_ER_PIX_PLLC_P, xpixpllcp);
 167
 168         udelay(50);
 169 }
 170
 171 /*
 172  * Mode-setting pipeline
 173  */
 174
 175 static const struct drm_plane_helper_funcs mgag200_g200er_primary_plane_helper_funcs = {
 176         MGAG200_PRIMARY_PLANE_HELPER_FUNCS,
 177 };
 178
 179 static const struct drm_plane_funcs mgag200_g200er_primary_plane_funcs = {
 180         MGAG200_PRIMARY_PLANE_FUNCS,
 181 };
 182
 183 static void mgag200_g200er_crtc_helper_atomic_enable(struct drm_crtc *crtc,
 184                                                      struct drm_atomic_state *old_state)
 185 {
 186         struct drm_device *dev = crtc->dev;
 187         struct mga_device *mdev = to_mga_device(dev);
 188         const struct mgag200_device_funcs *funcs = mdev->funcs;
 189         struct drm_crtc_state *crtc_state = crtc->state;
 190         struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
 191         struct mgag200_crtc_state *mgag200_crtc_state = to_mgag200_crtc_state(crtc_state);
 192         const struct drm_format_info *format = mgag200_crtc_state->format;
 193
 194         if (funcs->disable_vidrst)
 195                 funcs->disable_vidrst(mdev);
 196
 197         mgag200_set_format_regs(mdev, format);
 198         mgag200_set_mode_regs(mdev, adjusted_mode);
 199
 200         if (funcs->pixpllc_atomic_update)
 201                 funcs->pixpllc_atomic_update(crtc, old_state);
 202
 203         mgag200_g200er_reset_tagfifo(mdev);
 204
 205         mgag200_enable_display(mdev);
 206
 207         if (funcs->enable_vidrst)
 208                 funcs->enable_vidrst(mdev);
 209 }
 210
 211 static const struct drm_crtc_helper_funcs mgag200_g200er_crtc_helper_funcs = {
 212         .mode_valid = mgag200_crtc_helper_mode_valid,
 213         .atomic_check = mgag200_crtc_helper_atomic_check,
 214         .atomic_flush = mgag200_crtc_helper_atomic_flush,
 215         .atomic_enable = mgag200_g200er_crtc_helper_atomic_enable,
 216         .atomic_disable = mgag200_crtc_helper_atomic_disable
 217 };
 218
 219 static const struct drm_crtc_funcs mgag200_g200er_crtc_funcs = {
 220         MGAG200_CRTC_FUNCS,
 221 };
 222
 223 static const struct drm_encoder_funcs mgag200_g200er_dac_encoder_funcs = {
 224         MGAG200_DAC_ENCODER_FUNCS,
 225 };
 226
 227 static const struct drm_connector_helper_funcs mgag200_g200er_vga_connector_helper_funcs = {
 228         MGAG200_VGA_CONNECTOR_HELPER_FUNCS,
 229 };
 230
 231 static const struct drm_connector_funcs mgag200_g200er_vga_connector_funcs = {
 232         MGAG200_VGA_CONNECTOR_FUNCS,
 233 };
 234
 235 static int mgag200_g200er_pipeline_init(struct mga_device *mdev)
 236 {
 237         struct drm_device *dev = &mdev->base;
 238         struct drm_plane *primary_plane = &mdev->primary_plane;
 239         struct drm_crtc *crtc = &mdev->crtc;
 240         struct drm_encoder *encoder = &mdev->encoder;
 241         struct mga_i2c_chan *i2c = &mdev->i2c;
 242         struct drm_connector *connector = &mdev->connector;
 243         int ret;
 244
 245         ret = drm_universal_plane_init(dev, primary_plane, 0,
 246                                        &mgag200_g200er_primary_plane_funcs,
 247                                        mgag200_primary_plane_formats,
 248                                        mgag200_primary_plane_formats_size,
 249                                        mgag200_primary_plane_fmtmods,
 250                                        DRM_PLANE_TYPE_PRIMARY, NULL);
 251         if (ret) {
 252                 drm_err(dev, "drm_universal_plane_init() failed: %d\n", ret);
 253                 return ret;
 254         }
 255         drm_plane_helper_add(primary_plane, &mgag200_g200er_primary_plane_helper_funcs);
 256         drm_plane_enable_fb_damage_clips(primary_plane);
 257
 258         ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
 259                                         &mgag200_g200er_crtc_funcs, NULL);
 260         if (ret) {
 261                 drm_err(dev, "drm_crtc_init_with_planes() failed: %d\n", ret);
 262                 return ret;
 263         }
 264         drm_crtc_helper_add(crtc, &mgag200_g200er_crtc_helper_funcs);
 265
 266         /* FIXME: legacy gamma tables, but atomic gamma doesn't work without */
 267         drm_mode_crtc_set_gamma_size(crtc, MGAG200_LUT_SIZE);
 268         drm_crtc_enable_color_mgmt(crtc, 0, false, MGAG200_LUT_SIZE);
 269
 270         encoder->possible_crtcs = drm_crtc_mask(crtc);
 271         ret = drm_encoder_init(dev, encoder, &mgag200_g200er_dac_encoder_funcs,
 272                                DRM_MODE_ENCODER_DAC, NULL);
 273         if (ret) {
 274                 drm_err(dev, "drm_encoder_init() failed: %d\n", ret);
 275                 return ret;
 276         }
 277
 278         ret = mgag200_i2c_init(mdev, i2c);
 279         if (ret) {
 280                 drm_err(dev, "failed to add DDC bus: %d\n", ret);
 281                 return ret;
 282         }
 283
 284         ret = drm_connector_init_with_ddc(dev, connector,
 285                                           &mgag200_g200er_vga_connector_funcs,
 286                                           DRM_MODE_CONNECTOR_VGA,
 287                                           &i2c->adapter);
 288         if (ret) {
 289                 drm_err(dev, "drm_connector_init_with_ddc() failed: %d\n", ret);
 290                 return ret;
 291         }
 292         drm_connector_helper_add(connector, &mgag200_g200er_vga_connector_helper_funcs);
 293
 294         ret = drm_connector_attach_encoder(connector, encoder);
 295         if (ret) {
 296                 drm_err(dev, "drm_connector_attach_encoder() failed: %d\n", ret);
 297                 return ret;
 298         }
 299
 300         return 0;
 301 }
 302
 303 /*
 304  * DRM device
 305  */
 306
 307 static const struct mgag200_device_info mgag200_g200er_device_info =
 308         MGAG200_DEVICE_INFO_INIT(2048, 2048, 55000, false, 1, 0, false);
 309
 310 static const struct mgag200_device_funcs mgag200_g200er_device_funcs = {
 311         .pixpllc_atomic_check = mgag200_g200er_pixpllc_atomic_check,
 312         .pixpllc_atomic_update = mgag200_g200er_pixpllc_atomic_update,
 313 };
 314
 315 struct mga_device *mgag200_g200er_device_create(struct pci_dev *pdev, const struct drm_driver *drv)
 316 {
 317         struct mga_device *mdev;
 318         struct drm_device *dev;
 319         resource_size_t vram_available;
 320         int ret;
 321
 322         mdev = devm_drm_dev_alloc(&pdev->dev, drv, struct mga_device, base);
 323         if (IS_ERR(mdev))
 324                 return mdev;
 325         dev = &mdev->base;
 326
 327         pci_set_drvdata(pdev, dev);
 328
 329         ret = mgag200_device_preinit(mdev);
 330         if (ret)
 331                 return ERR_PTR(ret);
 332
 333         ret = mgag200_device_init(mdev, &mgag200_g200er_device_info,
 334                                   &mgag200_g200er_device_funcs);
 335         if (ret)
 336                 return ERR_PTR(ret);
 337
 338         mgag200_g200er_init_registers(mdev);
 339
 340         vram_available = mgag200_device_probe_vram(mdev);
 341
 342         ret = mgag200_mode_config_init(mdev, vram_available);
 343         if (ret)
 344                 return ERR_PTR(ret);
 345
 346         ret = mgag200_g200er_pipeline_init(mdev);
 347         if (ret)
 348                 return ERR_PTR(ret);
 349
 350         drm_mode_config_reset(dev);
 351
 352         return mdev;
 353 }