drivers/clk/mmp/clk-audio.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * MMP Audio Clock Controller driver
   4  *
   5  * Copyright (C) 2020 Lubomir Rintel <lkundrak@v3.sk>
   6  */
   7
   8 #include <linux/clk-provider.h>
   9 #include <linux/io.h>
  10 #include <linux/module.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/pm_clock.h>
  13 #include <linux/pm_runtime.h>
  14 #include <linux/slab.h>
  15 #include <dt-bindings/clock/marvell,mmp2-audio.h>
  16
  17 /* Audio Controller Registers */
  18 #define SSPA_AUD_CTRL                           0x04
  19 #define SSPA_AUD_PLL_CTRL0                      0x08
  20 #define SSPA_AUD_PLL_CTRL1                      0x0c
  21
  22 /* SSPA Audio Control Register */
  23 #define SSPA_AUD_CTRL_SYSCLK_SHIFT              0
  24 #define SSPA_AUD_CTRL_SYSCLK_DIV_SHIFT          1
  25 #define SSPA_AUD_CTRL_SSPA0_MUX_SHIFT           7
  26 #define SSPA_AUD_CTRL_SSPA0_SHIFT               8
  27 #define SSPA_AUD_CTRL_SSPA0_DIV_SHIFT           9
  28 #define SSPA_AUD_CTRL_SSPA1_SHIFT               16
  29 #define SSPA_AUD_CTRL_SSPA1_DIV_SHIFT           17
  30 #define SSPA_AUD_CTRL_SSPA1_MUX_SHIFT           23
  31 #define SSPA_AUD_CTRL_DIV_MASK                  0x7e
  32
  33 /* SSPA Audio PLL Control 0 Register */
  34 #define SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO_MASK (0x7 << 28)
  35 #define SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(x)   ((x) << 28)
  36 #define SSPA_AUD_PLL_CTRL0_FRACT_MASK           (0xfffff << 8)
  37 #define SSPA_AUD_PLL_CTRL0_FRACT(x)             ((x) << 8)
  38 #define SSPA_AUD_PLL_CTRL0_ENA_DITHER           (1 << 7)
  39 #define SSPA_AUD_PLL_CTRL0_ICP_2UA              (0 << 5)
  40 #define SSPA_AUD_PLL_CTRL0_ICP_5UA              (1 << 5)
  41 #define SSPA_AUD_PLL_CTRL0_ICP_7UA              (2 << 5)
  42 #define SSPA_AUD_PLL_CTRL0_ICP_10UA             (3 << 5)
  43 #define SSPA_AUD_PLL_CTRL0_DIV_FBCCLK_MASK      (0x3 << 3)
  44 #define SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(x)        ((x) << 3)
  45 #define SSPA_AUD_PLL_CTRL0_DIV_MCLK_MASK        (0x1 << 2)
  46 #define SSPA_AUD_PLL_CTRL0_DIV_MCLK(x)          ((x) << 2)
  47 #define SSPA_AUD_PLL_CTRL0_PD_OVPROT_DIS        (1 << 1)
  48 #define SSPA_AUD_PLL_CTRL0_PU                   (1 << 0)
  49
  50 /* SSPA Audio PLL Control 1 Register */
  51 #define SSPA_AUD_PLL_CTRL1_SEL_FAST_CLK         (1 << 24)
  52 #define SSPA_AUD_PLL_CTRL1_CLK_SEL_MASK         (1 << 11)
  53 #define SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL    (1 << 11)
  54 #define SSPA_AUD_PLL_CTRL1_CLK_SEL_VCXO         (0 << 11)
  55 #define SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN_MASK (0x7ff << 0)
  56 #define SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(x)  ((x) << 0)
  57
  58 #define CLK_AUDIO_NR_CLKS                       3
  59
  60 struct mmp2_audio_clk {
  61         void __iomem *mmio_base;
  62
  63         struct clk_hw audio_pll_hw;
  64         struct clk_mux sspa_mux;
  65         struct clk_mux sspa1_mux;
  66         struct clk_divider sysclk_div;
  67         struct clk_divider sspa0_div;
  68         struct clk_divider sspa1_div;
  69         struct clk_gate sysclk_gate;
  70         struct clk_gate sspa0_gate;
  71         struct clk_gate sspa1_gate;
  72
  73         u32 aud_ctrl;
  74         u32 aud_pll_ctrl0;
  75         u32 aud_pll_ctrl1;
  76
  77         spinlock_t lock;
  78
  79         /* Must be last */
  80         struct clk_hw_onecell_data clk_data;
  81 };
  82
  83 static const struct {
  84         unsigned long parent_rate;
  85         unsigned long freq_vco;
  86         unsigned char mclk;
  87         unsigned char fbcclk;
  88         unsigned short fract;
  89 } predivs[] = {
  90         { 26000000, 135475200, 0, 0, 0x8a18 },
  91         { 26000000, 147456000, 0, 1, 0x0da1 },
  92         { 38400000, 135475200, 1, 2, 0x8208 },
  93         { 38400000, 147456000, 1, 3, 0xaaaa },
  94 };
  95
  96 static const struct {
  97         unsigned char divisor;
  98         unsigned char modulo;
  99         unsigned char pattern;
 100 } postdivs[] = {
 101         {   1,  3,  0, },
 102         {   2,  5,  0, },
 103         {   4,  0,  0, },
 104         {   6,  1,  1, },
 105         {   8,  1,  0, },
 106         {   9,  1,  2, },
 107         {  12,  2,  1, },
 108         {  16,  2,  0, },
 109         {  18,  2,  2, },
 110         {  24,  4,  1, },
 111         {  36,  4,  2, },
 112         {  48,  6,  1, },
 113         {  72,  6,  2, },
 114 };
 115
 116 static unsigned long audio_pll_recalc_rate(struct clk_hw *hw,
 117                                            unsigned long parent_rate)
 118 {
 119         struct mmp2_audio_clk *priv = container_of(hw, struct mmp2_audio_clk, audio_pll_hw);
 120         unsigned int prediv;
 121         unsigned int postdiv;
 122         u32 aud_pll_ctrl0;
 123         u32 aud_pll_ctrl1;
 124
 125         aud_pll_ctrl0 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL0);
 126         aud_pll_ctrl0 &= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO_MASK |
 127                          SSPA_AUD_PLL_CTRL0_FRACT_MASK |
 128                          SSPA_AUD_PLL_CTRL0_ENA_DITHER |
 129                          SSPA_AUD_PLL_CTRL0_DIV_FBCCLK_MASK |
 130                          SSPA_AUD_PLL_CTRL0_DIV_MCLK_MASK |
 131                          SSPA_AUD_PLL_CTRL0_PU;
 132
 133         aud_pll_ctrl1 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL1);
 134         aud_pll_ctrl1 &= SSPA_AUD_PLL_CTRL1_CLK_SEL_MASK |
 135                          SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN_MASK;
 136
 137         for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
 138                 if (predivs[prediv].parent_rate != parent_rate)
 139                         continue;
 140                 for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
 141                         unsigned long freq;
 142                         u32 val;
 143
 144                         val = SSPA_AUD_PLL_CTRL0_ENA_DITHER;
 145                         val |= SSPA_AUD_PLL_CTRL0_PU;
 146                         val |= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(postdivs[postdiv].modulo);
 147                         val |= SSPA_AUD_PLL_CTRL0_FRACT(predivs[prediv].fract);
 148                         val |= SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(predivs[prediv].fbcclk);
 149                         val |= SSPA_AUD_PLL_CTRL0_DIV_MCLK(predivs[prediv].mclk);
 150                         if (val != aud_pll_ctrl0)
 151                                 continue;
 152
 153                         val = SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL;
 154                         val |= SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(postdivs[postdiv].pattern);
 155                         if (val != aud_pll_ctrl1)
 156                                 continue;
 157
 158                         freq = predivs[prediv].freq_vco;
 159                         freq /= postdivs[postdiv].divisor;
 160                         return freq;
 161                 }
 162         }
 163
 164         return 0;
 165 }
 166
 167 static long audio_pll_round_rate(struct clk_hw *hw, unsigned long rate,
 168                                  unsigned long *parent_rate)
 169 {
 170         unsigned int prediv;
 171         unsigned int postdiv;
 172         long rounded = 0;
 173
 174         for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
 175                 if (predivs[prediv].parent_rate != *parent_rate)
 176                         continue;
 177                 for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
 178                         long freq = predivs[prediv].freq_vco;
 179
 180                         freq /= postdivs[postdiv].divisor;
 181                         if (freq == rate)
 182                                 return rate;
 183                         if (freq < rate)
 184                                 continue;
 185                         if (rounded && freq > rounded)
 186                                 continue;
 187                         rounded = freq;
 188                 }
 189         }
 190
 191         return rounded;
 192 }
 193
 194 static int audio_pll_set_rate(struct clk_hw *hw, unsigned long rate,
 195                               unsigned long parent_rate)
 196 {
 197         struct mmp2_audio_clk *priv = container_of(hw, struct mmp2_audio_clk, audio_pll_hw);
 198         unsigned int prediv;
 199         unsigned int postdiv;
 200         unsigned long val;
 201
 202         for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
 203                 if (predivs[prediv].parent_rate != parent_rate)
 204                         continue;
 205
 206                 for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
 207                         if (rate * postdivs[postdiv].divisor != predivs[prediv].freq_vco)
 208                                 continue;
 209
 210                         val = SSPA_AUD_PLL_CTRL0_ENA_DITHER;
 211                         val |= SSPA_AUD_PLL_CTRL0_PU;
 212                         val |= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(postdivs[postdiv].modulo);
 213                         val |= SSPA_AUD_PLL_CTRL0_FRACT(predivs[prediv].fract);
 214                         val |= SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(predivs[prediv].fbcclk);
 215                         val |= SSPA_AUD_PLL_CTRL0_DIV_MCLK(predivs[prediv].mclk);
 216                         writel(val, priv->mmio_base + SSPA_AUD_PLL_CTRL0);
 217
 218                         val = SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL;
 219                         val |= SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(postdivs[postdiv].pattern);
 220                         writel(val, priv->mmio_base + SSPA_AUD_PLL_CTRL1);
 221
 222                         return 0;
 223                 }
 224         }
 225
 226         return -ERANGE;
 227 }
 228
 229 static const struct clk_ops audio_pll_ops = {
 230         .recalc_rate = audio_pll_recalc_rate,
 231         .round_rate = audio_pll_round_rate,
 232         .set_rate = audio_pll_set_rate,
 233 };
 234
 235 static int register_clocks(struct mmp2_audio_clk *priv, struct device *dev)
 236 {
 237         const struct clk_parent_data sspa_mux_parents[] = {
 238                 { .hw = &priv->audio_pll_hw },
 239                 { .fw_name = "i2s0" },
 240         };
 241         const struct clk_parent_data sspa1_mux_parents[] = {
 242                 { .hw = &priv->audio_pll_hw },
 243                 { .fw_name = "i2s1" },
 244         };
 245         int ret;
 246
 247         priv->audio_pll_hw.init = CLK_HW_INIT_FW_NAME("audio_pll",
 248                                 "vctcxo", &audio_pll_ops,
 249                                 CLK_SET_RATE_PARENT);
 250         ret = devm_clk_hw_register(dev, &priv->audio_pll_hw);
 251         if (ret)
 252                 return ret;
 253
 254         priv->sspa_mux.hw.init = CLK_HW_INIT_PARENTS_DATA("sspa_mux",
 255                                 sspa_mux_parents, &clk_mux_ops,
 256                                 CLK_SET_RATE_PARENT);
 257         priv->sspa_mux.reg = priv->mmio_base + SSPA_AUD_CTRL;
 258         priv->sspa_mux.mask = 1;
 259         priv->sspa_mux.shift = SSPA_AUD_CTRL_SSPA0_MUX_SHIFT;
 260         ret = devm_clk_hw_register(dev, &priv->sspa_mux.hw);
 261         if (ret)
 262                 return ret;
 263
 264         priv->sysclk_div.hw.init = CLK_HW_INIT_HW("sys_div",
 265                                 &priv->sspa_mux.hw, &clk_divider_ops,
 266                                 CLK_SET_RATE_PARENT);
 267         priv->sysclk_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
 268         priv->sysclk_div.shift = SSPA_AUD_CTRL_SYSCLK_DIV_SHIFT;
 269         priv->sysclk_div.width = 6;
 270         priv->sysclk_div.flags = CLK_DIVIDER_ONE_BASED;
 271         priv->sysclk_div.flags |= CLK_DIVIDER_ROUND_CLOSEST;
 272         priv->sysclk_div.flags |= CLK_DIVIDER_ALLOW_ZERO;
 273         ret = devm_clk_hw_register(dev, &priv->sysclk_div.hw);
 274         if (ret)
 275                 return ret;
 276
 277         priv->sysclk_gate.hw.init = CLK_HW_INIT_HW("sys_clk",
 278                                 &priv->sysclk_div.hw, &clk_gate_ops,
 279                                 CLK_SET_RATE_PARENT);
 280         priv->sysclk_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
 281         priv->sysclk_gate.bit_idx = SSPA_AUD_CTRL_SYSCLK_SHIFT;
 282         ret = devm_clk_hw_register(dev, &priv->sysclk_gate.hw);
 283         if (ret)
 284                 return ret;
 285
 286         priv->sspa0_div.hw.init = CLK_HW_INIT_HW("sspa0_div",
 287                                 &priv->sspa_mux.hw, &clk_divider_ops, 0);
 288         priv->sspa0_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
 289         priv->sspa0_div.shift = SSPA_AUD_CTRL_SSPA0_DIV_SHIFT;
 290         priv->sspa0_div.width = 6;
 291         priv->sspa0_div.flags = CLK_DIVIDER_ONE_BASED;
 292         priv->sspa0_div.flags |= CLK_DIVIDER_ROUND_CLOSEST;
 293         priv->sspa0_div.flags |= CLK_DIVIDER_ALLOW_ZERO;
 294         ret = devm_clk_hw_register(dev, &priv->sspa0_div.hw);
 295         if (ret)
 296                 return ret;
 297
 298         priv->sspa0_gate.hw.init = CLK_HW_INIT_HW("sspa0_clk",
 299                                 &priv->sspa0_div.hw, &clk_gate_ops,
 300                                 CLK_SET_RATE_PARENT);
 301         priv->sspa0_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
 302         priv->sspa0_gate.bit_idx = SSPA_AUD_CTRL_SSPA0_SHIFT;
 303         ret = devm_clk_hw_register(dev, &priv->sspa0_gate.hw);
 304         if (ret)
 305                 return ret;
 306
 307         priv->sspa1_mux.hw.init = CLK_HW_INIT_PARENTS_DATA("sspa1_mux",
 308                                 sspa1_mux_parents, &clk_mux_ops,
 309                                 CLK_SET_RATE_PARENT);
 310         priv->sspa1_mux.reg = priv->mmio_base + SSPA_AUD_CTRL;
 311         priv->sspa1_mux.mask = 1;
 312         priv->sspa1_mux.shift = SSPA_AUD_CTRL_SSPA1_MUX_SHIFT;
 313         ret = devm_clk_hw_register(dev, &priv->sspa1_mux.hw);
 314         if (ret)
 315                 return ret;
 316
 317         priv->sspa1_div.hw.init = CLK_HW_INIT_HW("sspa1_div",
 318                                 &priv->sspa1_mux.hw, &clk_divider_ops, 0);
 319         priv->sspa1_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
 320         priv->sspa1_div.shift = SSPA_AUD_CTRL_SSPA1_DIV_SHIFT;
 321         priv->sspa1_div.width = 6;
 322         priv->sspa1_div.flags = CLK_DIVIDER_ONE_BASED;
 323         priv->sspa1_div.flags |= CLK_DIVIDER_ROUND_CLOSEST;
 324         priv->sspa1_div.flags |= CLK_DIVIDER_ALLOW_ZERO;
 325         ret = devm_clk_hw_register(dev, &priv->sspa1_div.hw);
 326         if (ret)
 327                 return ret;
 328
 329         priv->sspa1_gate.hw.init = CLK_HW_INIT_HW("sspa1_clk",
 330                                 &priv->sspa1_div.hw, &clk_gate_ops,
 331                                 CLK_SET_RATE_PARENT);
 332         priv->sspa1_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
 333         priv->sspa1_gate.bit_idx = SSPA_AUD_CTRL_SSPA1_SHIFT;
 334         ret = devm_clk_hw_register(dev, &priv->sspa1_gate.hw);
 335         if (ret)
 336                 return ret;
 337
 338         priv->clk_data.hws[MMP2_CLK_AUDIO_SYSCLK] = &priv->sysclk_gate.hw;
 339         priv->clk_data.hws[MMP2_CLK_AUDIO_SSPA0] = &priv->sspa0_gate.hw;
 340         priv->clk_data.hws[MMP2_CLK_AUDIO_SSPA1] = &priv->sspa1_gate.hw;
 341         priv->clk_data.num = CLK_AUDIO_NR_CLKS;
 342
 343         return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
 344                                       &priv->clk_data);
 345 }
 346
 347 static int mmp2_audio_clk_probe(struct platform_device *pdev)
 348 {
 349         struct mmp2_audio_clk *priv;
 350         int ret;
 351
 352         priv = devm_kzalloc(&pdev->dev,
 353                             struct_size(priv, clk_data.hws,
 354                                         CLK_AUDIO_NR_CLKS),
 355                             GFP_KERNEL);
 356         if (!priv)
 357                 return -ENOMEM;
 358
 359         spin_lock_init(&priv->lock);
 360         platform_set_drvdata(pdev, priv);
 361
 362         priv->mmio_base = devm_platform_ioremap_resource(pdev, 0);
 363         if (IS_ERR(priv->mmio_base))
 364                 return PTR_ERR(priv->mmio_base);
 365
 366         pm_runtime_enable(&pdev->dev);
 367         ret = pm_clk_create(&pdev->dev);
 368         if (ret)
 369                 goto disable_pm_runtime;
 370
 371         ret = pm_clk_add(&pdev->dev, "audio");
 372         if (ret)
 373                 goto destroy_pm_clk;
 374
 375         ret = register_clocks(priv, &pdev->dev);
 376         if (ret)
 377                 goto destroy_pm_clk;
 378
 379         return 0;
 380
 381 destroy_pm_clk:
 382         pm_clk_destroy(&pdev->dev);
 383 disable_pm_runtime:
 384         pm_runtime_disable(&pdev->dev);
 385
 386         return ret;
 387 }
 388
 389 static void mmp2_audio_clk_remove(struct platform_device *pdev)
 390 {
 391         pm_clk_destroy(&pdev->dev);
 392         pm_runtime_disable(&pdev->dev);
 393 }
 394
 395 #ifdef CONFIG_PM
 396 static int mmp2_audio_clk_suspend(struct device *dev)
 397 {
 398         struct mmp2_audio_clk *priv = dev_get_drvdata(dev);
 399
 400         priv->aud_ctrl = readl(priv->mmio_base + SSPA_AUD_CTRL);
 401         priv->aud_pll_ctrl0 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL0);
 402         priv->aud_pll_ctrl1 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL1);
 403         pm_clk_suspend(dev);
 404
 405         return 0;
 406 }
 407
 408 static int mmp2_audio_clk_resume(struct device *dev)
 409 {
 410         struct mmp2_audio_clk *priv = dev_get_drvdata(dev);
 411
 412         pm_clk_resume(dev);
 413         writel(priv->aud_ctrl, priv->mmio_base + SSPA_AUD_CTRL);
 414         writel(priv->aud_pll_ctrl0, priv->mmio_base + SSPA_AUD_PLL_CTRL0);
 415         writel(priv->aud_pll_ctrl1, priv->mmio_base + SSPA_AUD_PLL_CTRL1);
 416
 417         return 0;
 418 }
 419 #endif
 420
 421 static const struct dev_pm_ops mmp2_audio_clk_pm_ops = {
 422         SET_RUNTIME_PM_OPS(mmp2_audio_clk_suspend, mmp2_audio_clk_resume, NULL)
 423 };
 424
 425 static const struct of_device_id mmp2_audio_clk_of_match[] = {
 426         { .compatible = "marvell,mmp2-audio-clock" },
 427         {}
 428 };
 429
 430 MODULE_DEVICE_TABLE(of, mmp2_audio_clk_of_match);
 431
 432 static struct platform_driver mmp2_audio_clk_driver = {
 433         .driver = {
 434                 .name = "mmp2-audio-clock",
 435                 .of_match_table = of_match_ptr(mmp2_audio_clk_of_match),
 436                 .pm = &mmp2_audio_clk_pm_ops,
 437         },
 438         .probe = mmp2_audio_clk_probe,
 439         .remove = mmp2_audio_clk_remove,
 440 };
 441 module_platform_driver(mmp2_audio_clk_driver);
 442
 443 MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
 444 MODULE_DESCRIPTION("Clock driver for MMP2 Audio subsystem");
 445 MODULE_LICENSE("GPL");