drivers/clk/clk-ast2600.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 // Copyright IBM Corp
   3 // Copyright ASPEED Technology
   4
   5 #define pr_fmt(fmt) "clk-ast2600: " fmt
   6
   7 #include <linux/mfd/syscon.h>
   8 #include <linux/of_address.h>
   9 #include <linux/of_device.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/regmap.h>
  12 #include <linux/slab.h>
  13
  14 #include <dt-bindings/clock/ast2600-clock.h>
  15
  16 #include "clk-aspeed.h"
  17
  18 #define ASPEED_G6_NUM_CLKS              67
  19
  20 #define ASPEED_G6_SILICON_REV           0x004
  21
  22 #define ASPEED_G6_RESET_CTRL            0x040
  23 #define ASPEED_G6_RESET_CTRL2           0x050
  24
  25 #define ASPEED_G6_CLK_STOP_CTRL         0x080
  26 #define ASPEED_G6_CLK_STOP_CTRL2        0x090
  27
  28 #define ASPEED_G6_MISC_CTRL             0x0C0
  29 #define  UART_DIV13_EN                  BIT(12)
  30
  31 #define ASPEED_G6_CLK_SELECTION1        0x300
  32 #define ASPEED_G6_CLK_SELECTION2        0x304
  33 #define ASPEED_G6_CLK_SELECTION4        0x310
  34
  35 #define ASPEED_HPLL_PARAM               0x200
  36 #define ASPEED_APLL_PARAM               0x210
  37 #define ASPEED_MPLL_PARAM               0x220
  38 #define ASPEED_EPLL_PARAM               0x240
  39 #define ASPEED_DPLL_PARAM               0x260
  40
  41 #define ASPEED_G6_STRAP1                0x500
  42
  43 /* Globally visible clocks */
  44 static DEFINE_SPINLOCK(aspeed_g6_clk_lock);
  45
  46 /* Keeps track of all clocks */
  47 static struct clk_hw_onecell_data *aspeed_g6_clk_data;
  48
  49 static void __iomem *scu_g6_base;
  50
  51 /*
  52  * Clocks marked with CLK_IS_CRITICAL:
  53  *
  54  *  ref0 and ref1 are essential for the SoC to operate
  55  *  mpll is required if SDRAM is used
  56  */
  57 static const struct aspeed_gate_data aspeed_g6_gates[] = {
  58         /*                                  clk rst  name               parent   flags */
  59         [ASPEED_CLK_GATE_MCLK]          = {  0, -1, "mclk-gate",        "mpll",  CLK_IS_CRITICAL }, /* SDRAM */
  60         [ASPEED_CLK_GATE_ECLK]          = {  1, -1, "eclk-gate",        "eclk",  0 },   /* Video Engine */
  61         [ASPEED_CLK_GATE_GCLK]          = {  2,  7, "gclk-gate",        NULL,    0 },   /* 2D engine */
  62         /* vclk parent - dclk/d1clk/hclk/mclk */
  63         [ASPEED_CLK_GATE_VCLK]          = {  3,  6, "vclk-gate",        NULL,    0 },   /* Video Capture */
  64         [ASPEED_CLK_GATE_BCLK]          = {  4,  8, "bclk-gate",        "bclk",  0 }, /* PCIe/PCI */
  65         /* From dpll */
  66         [ASPEED_CLK_GATE_DCLK]          = {  5, -1, "dclk-gate",        NULL,    CLK_IS_CRITICAL }, /* DAC */
  67         [ASPEED_CLK_GATE_REF0CLK]       = {  6, -1, "ref0clk-gate",     "clkin", CLK_IS_CRITICAL },
  68         [ASPEED_CLK_GATE_USBPORT2CLK]   = {  7,  3, "usb-port2-gate",   NULL,    0 },   /* USB2.0 Host port 2 */
  69         /* Reserved 8 */
  70         [ASPEED_CLK_GATE_USBUHCICLK]    = {  9, 15, "usb-uhci-gate",    NULL,    0 },   /* USB1.1 (requires port 2 enabled) */
  71         /* From dpll/epll/40mhz usb p1 phy/gpioc6/dp phy pll */
  72         [ASPEED_CLK_GATE_D1CLK]         = { 10, 13, "d1clk-gate",       "d1clk", 0 },   /* GFX CRT */
  73         /* Reserved 11/12 */
  74         [ASPEED_CLK_GATE_YCLK]          = { 13,  4, "yclk-gate",        NULL,    0 },   /* HAC */
  75         [ASPEED_CLK_GATE_USBPORT1CLK]   = { 14, 14, "usb-port1-gate",   NULL,    0 },   /* USB2 hub/USB2 host port 1/USB1.1 dev */
  76         [ASPEED_CLK_GATE_UART5CLK]      = { 15, -1, "uart5clk-gate",    "uart",  0 },   /* UART5 */
  77         /* Reserved 16/19 */
  78         [ASPEED_CLK_GATE_MAC1CLK]       = { 20, 11, "mac1clk-gate",     "mac12", 0 },   /* MAC1 */
  79         [ASPEED_CLK_GATE_MAC2CLK]       = { 21, 12, "mac2clk-gate",     "mac12", 0 },   /* MAC2 */
  80         /* Reserved 22/23 */
  81         [ASPEED_CLK_GATE_RSACLK]        = { 24,  4, "rsaclk-gate",      NULL,    0 },   /* HAC */
  82         [ASPEED_CLK_GATE_RVASCLK]       = { 25,  9, "rvasclk-gate",     NULL,    0 },   /* RVAS */
  83         /* Reserved 26 */
  84         [ASPEED_CLK_GATE_EMMCCLK]       = { 27, 16, "emmcclk-gate",     NULL,    0 },   /* For card clk */
  85         /* Reserved 28/29/30 */
  86         [ASPEED_CLK_GATE_LCLK]          = { 32, 32, "lclk-gate",        NULL,    0 }, /* LPC */
  87         [ASPEED_CLK_GATE_ESPICLK]       = { 33, -1, "espiclk-gate",     NULL,    0 }, /* eSPI */
  88         [ASPEED_CLK_GATE_REF1CLK]       = { 34, -1, "ref1clk-gate",     "clkin", CLK_IS_CRITICAL },
  89         /* Reserved 35 */
  90         [ASPEED_CLK_GATE_SDCLK]         = { 36, 56, "sdclk-gate",       NULL,    0 },   /* SDIO/SD */
  91         [ASPEED_CLK_GATE_LHCCLK]        = { 37, -1, "lhclk-gate",       "lhclk", 0 },   /* LPC master/LPC+ */
  92         /* Reserved 38 RSA: no longer used */
  93         /* Reserved 39 */
  94         [ASPEED_CLK_GATE_I3C0CLK]       = { 40,  40, "i3c0clk-gate",    NULL,    0 },   /* I3C0 */
  95         [ASPEED_CLK_GATE_I3C1CLK]       = { 41,  41, "i3c1clk-gate",    NULL,    0 },   /* I3C1 */
  96         [ASPEED_CLK_GATE_I3C2CLK]       = { 42,  42, "i3c2clk-gate",    NULL,    0 },   /* I3C2 */
  97         [ASPEED_CLK_GATE_I3C3CLK]       = { 43,  43, "i3c3clk-gate",    NULL,    0 },   /* I3C3 */
  98         [ASPEED_CLK_GATE_I3C4CLK]       = { 44,  44, "i3c4clk-gate",    NULL,    0 },   /* I3C4 */
  99         [ASPEED_CLK_GATE_I3C5CLK]       = { 45,  45, "i3c5clk-gate",    NULL,    0 },   /* I3C5 */
 100         [ASPEED_CLK_GATE_I3C6CLK]       = { 46,  46, "i3c6clk-gate",    NULL,    0 },   /* I3C6 */
 101         [ASPEED_CLK_GATE_I3C7CLK]       = { 47,  47, "i3c7clk-gate",    NULL,    0 },   /* I3C7 */
 102         [ASPEED_CLK_GATE_UART1CLK]      = { 48,  -1, "uart1clk-gate",   "uart",  0 },   /* UART1 */
 103         [ASPEED_CLK_GATE_UART2CLK]      = { 49,  -1, "uart2clk-gate",   "uart",  0 },   /* UART2 */
 104         [ASPEED_CLK_GATE_UART3CLK]      = { 50,  -1, "uart3clk-gate",   "uart",  0 },   /* UART3 */
 105         [ASPEED_CLK_GATE_UART4CLK]      = { 51,  -1, "uart4clk-gate",   "uart",  0 },   /* UART4 */
 106         [ASPEED_CLK_GATE_MAC3CLK]       = { 52,  52, "mac3clk-gate",    "mac34", 0 },   /* MAC3 */
 107         [ASPEED_CLK_GATE_MAC4CLK]       = { 53,  53, "mac4clk-gate",    "mac34", 0 },   /* MAC4 */
 108         [ASPEED_CLK_GATE_UART6CLK]      = { 54,  -1, "uart6clk-gate",   "uartx", 0 },   /* UART6 */
 109         [ASPEED_CLK_GATE_UART7CLK]      = { 55,  -1, "uart7clk-gate",   "uartx", 0 },   /* UART7 */
 110         [ASPEED_CLK_GATE_UART8CLK]      = { 56,  -1, "uart8clk-gate",   "uartx", 0 },   /* UART8 */
 111         [ASPEED_CLK_GATE_UART9CLK]      = { 57,  -1, "uart9clk-gate",   "uartx", 0 },   /* UART9 */
 112         [ASPEED_CLK_GATE_UART10CLK]     = { 58,  -1, "uart10clk-gate",  "uartx", 0 },   /* UART10 */
 113         [ASPEED_CLK_GATE_UART11CLK]     = { 59,  -1, "uart11clk-gate",  "uartx", 0 },   /* UART11 */
 114         [ASPEED_CLK_GATE_UART12CLK]     = { 60,  -1, "uart12clk-gate",  "uartx", 0 },   /* UART12 */
 115         [ASPEED_CLK_GATE_UART13CLK]     = { 61,  -1, "uart13clk-gate",  "uartx", 0 },   /* UART13 */
 116         [ASPEED_CLK_GATE_FSICLK]        = { 62,  59, "fsiclk-gate",     NULL,    0 },   /* FSI */
 117 };
 118
 119 static const char * const eclk_parent_names[] = { "mpll", "hpll", "dpll" };
 120
 121 static const struct clk_div_table ast2600_eclk_div_table[] = {
 122         { 0x0, 2 },
 123         { 0x1, 2 },
 124         { 0x2, 3 },
 125         { 0x3, 4 },
 126         { 0x4, 5 },
 127         { 0x5, 6 },
 128         { 0x6, 7 },
 129         { 0x7, 8 },
 130         { 0 }
 131 };
 132
 133 static const struct clk_div_table ast2600_mac_div_table[] = {
 134         { 0x0, 4 },
 135         { 0x1, 4 },
 136         { 0x2, 6 },
 137         { 0x3, 8 },
 138         { 0x4, 10 },
 139         { 0x5, 12 },
 140         { 0x6, 14 },
 141         { 0x7, 16 },
 142         { 0 }
 143 };
 144
 145 static const struct clk_div_table ast2600_div_table[] = {
 146         { 0x0, 4 },
 147         { 0x1, 8 },
 148         { 0x2, 12 },
 149         { 0x3, 16 },
 150         { 0x4, 20 },
 151         { 0x5, 24 },
 152         { 0x6, 28 },
 153         { 0x7, 32 },
 154         { 0 }
 155 };
 156
 157 /* For hpll/dpll/epll/mpll */
 158 static struct clk_hw *ast2600_calc_pll(const char *name, u32 val)
 159 {
 160         unsigned int mult, div;
 161
 162         if (val & BIT(24)) {
 163                 /* Pass through mode */
 164                 mult = div = 1;
 165         } else {
 166                 /* F = 25Mhz * [(M + 2) / (n + 1)] / (p + 1) */
 167                 u32 m = val  & 0x1fff;
 168                 u32 n = (val >> 13) & 0x3f;
 169                 u32 p = (val >> 19) & 0xf;
 170                 mult = (m + 1) / (n + 1);
 171                 div = (p + 1);
 172         }
 173         return clk_hw_register_fixed_factor(NULL, name, "clkin", 0,
 174                         mult, div);
 175 };
 176
 177 static struct clk_hw *ast2600_calc_apll(const char *name, u32 val)
 178 {
 179         unsigned int mult, div;
 180
 181         if (val & BIT(20)) {
 182                 /* Pass through mode */
 183                 mult = div = 1;
 184         } else {
 185                 /* F = 25Mhz * (2-od) * [(m + 2) / (n + 1)] */
 186                 u32 m = (val >> 5) & 0x3f;
 187                 u32 od = (val >> 4) & 0x1;
 188                 u32 n = val & 0xf;
 189
 190                 mult = (2 - od) * (m + 2);
 191                 div = n + 1;
 192         }
 193         return clk_hw_register_fixed_factor(NULL, name, "clkin", 0,
 194                         mult, div);
 195 };
 196
 197 static u32 get_bit(u8 idx)
 198 {
 199         return BIT(idx % 32);
 200 }
 201
 202 static u32 get_reset_reg(struct aspeed_clk_gate *gate)
 203 {
 204         if (gate->reset_idx < 32)
 205                 return ASPEED_G6_RESET_CTRL;
 206
 207         return ASPEED_G6_RESET_CTRL2;
 208 }
 209
 210 static u32 get_clock_reg(struct aspeed_clk_gate *gate)
 211 {
 212         if (gate->clock_idx < 32)
 213                 return ASPEED_G6_CLK_STOP_CTRL;
 214
 215         return ASPEED_G6_CLK_STOP_CTRL2;
 216 }
 217
 218 static int aspeed_g6_clk_is_enabled(struct clk_hw *hw)
 219 {
 220         struct aspeed_clk_gate *gate = to_aspeed_clk_gate(hw);
 221         u32 clk = get_bit(gate->clock_idx);
 222         u32 rst = get_bit(gate->reset_idx);
 223         u32 reg;
 224         u32 enval;
 225
 226         /*
 227          * If the IP is in reset, treat the clock as not enabled,
 228          * this happens with some clocks such as the USB one when
 229          * coming from cold reset. Without this, aspeed_clk_enable()
 230          * will fail to lift the reset.
 231          */
 232         if (gate->reset_idx >= 0) {
 233                 regmap_read(gate->map, get_reset_reg(gate), &reg);
 234
 235                 if (reg & rst)
 236                         return 0;
 237         }
 238
 239         regmap_read(gate->map, get_clock_reg(gate), &reg);
 240
 241         enval = (gate->flags & CLK_GATE_SET_TO_DISABLE) ? 0 : clk;
 242
 243         return ((reg & clk) == enval) ? 1 : 0;
 244 }
 245
 246 static int aspeed_g6_clk_enable(struct clk_hw *hw)
 247 {
 248         struct aspeed_clk_gate *gate = to_aspeed_clk_gate(hw);
 249         unsigned long flags;
 250         u32 clk = get_bit(gate->clock_idx);
 251         u32 rst = get_bit(gate->reset_idx);
 252
 253         spin_lock_irqsave(gate->lock, flags);
 254
 255         if (aspeed_g6_clk_is_enabled(hw)) {
 256                 spin_unlock_irqrestore(gate->lock, flags);
 257                 return 0;
 258         }
 259
 260         if (gate->reset_idx >= 0) {
 261                 /* Put IP in reset */
 262                 regmap_write(gate->map, get_reset_reg(gate), rst);
 263                 /* Delay 100us */
 264                 udelay(100);
 265         }
 266
 267         /* Enable clock */
 268         if (gate->flags & CLK_GATE_SET_TO_DISABLE) {
 269                 /* Clock is clear to enable, so use set to clear register */
 270                 regmap_write(gate->map, get_clock_reg(gate) + 0x04, clk);
 271         } else {
 272                 /* Clock is set to enable, so use write to set register */
 273                 regmap_write(gate->map, get_clock_reg(gate), clk);
 274         }
 275
 276         if (gate->reset_idx >= 0) {
 277                 /* A delay of 10ms is specified by the ASPEED docs */
 278                 mdelay(10);
 279                 /* Take IP out of reset */
 280                 regmap_write(gate->map, get_reset_reg(gate) + 0x4, rst);
 281         }
 282
 283         spin_unlock_irqrestore(gate->lock, flags);
 284
 285         return 0;
 286 }
 287
 288 static void aspeed_g6_clk_disable(struct clk_hw *hw)
 289 {
 290         struct aspeed_clk_gate *gate = to_aspeed_clk_gate(hw);
 291         unsigned long flags;
 292         u32 clk = get_bit(gate->clock_idx);
 293
 294         spin_lock_irqsave(gate->lock, flags);
 295
 296         if (gate->flags & CLK_GATE_SET_TO_DISABLE) {
 297                 regmap_write(gate->map, get_clock_reg(gate), clk);
 298         } else {
 299                 /* Use set to clear register */
 300                 regmap_write(gate->map, get_clock_reg(gate) + 0x4, clk);
 301         }
 302
 303         spin_unlock_irqrestore(gate->lock, flags);
 304 }
 305
 306 static const struct clk_ops aspeed_g6_clk_gate_ops = {
 307         .enable = aspeed_g6_clk_enable,
 308         .disable = aspeed_g6_clk_disable,
 309         .is_enabled = aspeed_g6_clk_is_enabled,
 310 };
 311
 312 static int aspeed_g6_reset_deassert(struct reset_controller_dev *rcdev,
 313                                     unsigned long id)
 314 {
 315         struct aspeed_reset *ar = to_aspeed_reset(rcdev);
 316         u32 rst = get_bit(id);
 317         u32 reg = id >= 32 ? ASPEED_G6_RESET_CTRL2 : ASPEED_G6_RESET_CTRL;
 318
 319         /* Use set to clear register */
 320         return regmap_write(ar->map, reg + 0x04, rst);
 321 }
 322
 323 static int aspeed_g6_reset_assert(struct reset_controller_dev *rcdev,
 324                                   unsigned long id)
 325 {
 326         struct aspeed_reset *ar = to_aspeed_reset(rcdev);
 327         u32 rst = get_bit(id);
 328         u32 reg = id >= 32 ? ASPEED_G6_RESET_CTRL2 : ASPEED_G6_RESET_CTRL;
 329
 330         return regmap_write(ar->map, reg, rst);
 331 }
 332
 333 static int aspeed_g6_reset_status(struct reset_controller_dev *rcdev,
 334                                   unsigned long id)
 335 {
 336         struct aspeed_reset *ar = to_aspeed_reset(rcdev);
 337         int ret;
 338         u32 val;
 339         u32 rst = get_bit(id);
 340         u32 reg = id >= 32 ? ASPEED_G6_RESET_CTRL2 : ASPEED_G6_RESET_CTRL;
 341
 342         ret = regmap_read(ar->map, reg, &val);
 343         if (ret)
 344                 return ret;
 345
 346         return !!(val & rst);
 347 }
 348
 349 static const struct reset_control_ops aspeed_g6_reset_ops = {
 350         .assert = aspeed_g6_reset_assert,
 351         .deassert = aspeed_g6_reset_deassert,
 352         .status = aspeed_g6_reset_status,
 353 };
 354
 355 static struct clk_hw *aspeed_g6_clk_hw_register_gate(struct device *dev,
 356                 const char *name, const char *parent_name, unsigned long flags,
 357                 struct regmap *map, u8 clock_idx, u8 reset_idx,
 358                 u8 clk_gate_flags, spinlock_t *lock)
 359 {
 360         struct aspeed_clk_gate *gate;
 361         struct clk_init_data init;
 362         struct clk_hw *hw;
 363         int ret;
 364
 365         gate = kzalloc(sizeof(*gate), GFP_KERNEL);
 366         if (!gate)
 367                 return ERR_PTR(-ENOMEM);
 368
 369         init.name = name;
 370         init.ops = &aspeed_g6_clk_gate_ops;
 371         init.flags = flags;
 372         init.parent_names = parent_name ? &parent_name : NULL;
 373         init.num_parents = parent_name ? 1 : 0;
 374
 375         gate->map = map;
 376         gate->clock_idx = clock_idx;
 377         gate->reset_idx = reset_idx;
 378         gate->flags = clk_gate_flags;
 379         gate->lock = lock;
 380         gate->hw.init = &init;
 381
 382         hw = &gate->hw;
 383         ret = clk_hw_register(dev, hw);
 384         if (ret) {
 385                 kfree(gate);
 386                 hw = ERR_PTR(ret);
 387         }
 388
 389         return hw;
 390 }
 391
 392 static const char * const vclk_parent_names[] = {
 393         "dpll",
 394         "d1pll",
 395         "hclk",
 396         "mclk",
 397 };
 398
 399 static const char * const d1clk_parent_names[] = {
 400         "dpll",
 401         "epll",
 402         "usb-phy-40m",
 403         "gpioc6_clkin",
 404         "dp_phy_pll",
 405 };
 406
 407 static int aspeed_g6_clk_probe(struct platform_device *pdev)
 408 {
 409         struct device *dev = &pdev->dev;
 410         struct aspeed_reset *ar;
 411         struct regmap *map;
 412         struct clk_hw *hw;
 413         u32 val, rate;
 414         int i, ret;
 415
 416         map = syscon_node_to_regmap(dev->of_node);
 417         if (IS_ERR(map)) {
 418                 dev_err(dev, "no syscon regmap\n");
 419                 return PTR_ERR(map);
 420         }
 421
 422         ar = devm_kzalloc(dev, sizeof(*ar), GFP_KERNEL);
 423         if (!ar)
 424                 return -ENOMEM;
 425
 426         ar->map = map;
 427
 428         ar->rcdev.owner = THIS_MODULE;
 429         ar->rcdev.nr_resets = 64;
 430         ar->rcdev.ops = &aspeed_g6_reset_ops;
 431         ar->rcdev.of_node = dev->of_node;
 432
 433         ret = devm_reset_controller_register(dev, &ar->rcdev);
 434         if (ret) {
 435                 dev_err(dev, "could not register reset controller\n");
 436                 return ret;
 437         }
 438
 439         /* UART clock div13 setting */
 440         regmap_read(map, ASPEED_G6_MISC_CTRL, &val);
 441         if (val & UART_DIV13_EN)
 442                 rate = 24000000 / 13;
 443         else
 444                 rate = 24000000;
 445         hw = clk_hw_register_fixed_rate(dev, "uart", NULL, 0, rate);
 446         if (IS_ERR(hw))
 447                 return PTR_ERR(hw);
 448         aspeed_g6_clk_data->hws[ASPEED_CLK_UART] = hw;
 449
 450         /* UART6~13 clock div13 setting */
 451         regmap_read(map, 0x80, &val);
 452         if (val & BIT(31))
 453                 rate = 24000000 / 13;
 454         else
 455                 rate = 24000000;
 456         hw = clk_hw_register_fixed_rate(dev, "uartx", NULL, 0, rate);
 457         if (IS_ERR(hw))
 458                 return PTR_ERR(hw);
 459         aspeed_g6_clk_data->hws[ASPEED_CLK_UARTX] = hw;
 460
 461         /* EMMC ext clock divider */
 462         hw = clk_hw_register_gate(dev, "emmc_extclk_gate", "hpll", 0,
 463                         scu_g6_base + ASPEED_G6_CLK_SELECTION1, 15, 0,
 464                         &aspeed_g6_clk_lock);
 465         if (IS_ERR(hw))
 466                 return PTR_ERR(hw);
 467         hw = clk_hw_register_divider_table(dev, "emmc_extclk", "emmc_extclk_gate", 0,
 468                         scu_g6_base + ASPEED_G6_CLK_SELECTION1, 12, 3, 0,
 469                         ast2600_div_table,
 470                         &aspeed_g6_clk_lock);
 471         if (IS_ERR(hw))
 472                 return PTR_ERR(hw);
 473         aspeed_g6_clk_data->hws[ASPEED_CLK_EMMC] = hw;
 474
 475         /* SD/SDIO clock divider and gate */
 476         hw = clk_hw_register_gate(dev, "sd_extclk_gate", "hpll", 0,
 477                         scu_g6_base + ASPEED_G6_CLK_SELECTION4, 31, 0,
 478                         &aspeed_g6_clk_lock);
 479         if (IS_ERR(hw))
 480                 return PTR_ERR(hw);
 481         hw = clk_hw_register_divider_table(dev, "sd_extclk", "sd_extclk_gate",
 482                         0, scu_g6_base + ASPEED_G6_CLK_SELECTION4, 28, 3, 0,
 483                         ast2600_div_table,
 484                         &aspeed_g6_clk_lock);
 485         if (IS_ERR(hw))
 486                 return PTR_ERR(hw);
 487         aspeed_g6_clk_data->hws[ASPEED_CLK_SDIO] = hw;
 488
 489         /* MAC1/2 AHB bus clock divider */
 490         hw = clk_hw_register_divider_table(dev, "mac12", "hpll", 0,
 491                         scu_g6_base + ASPEED_G6_CLK_SELECTION1, 16, 3, 0,
 492                         ast2600_mac_div_table,
 493                         &aspeed_g6_clk_lock);
 494         if (IS_ERR(hw))
 495                 return PTR_ERR(hw);
 496         aspeed_g6_clk_data->hws[ASPEED_CLK_MAC12] = hw;
 497
 498         /* MAC3/4 AHB bus clock divider */
 499         hw = clk_hw_register_divider_table(dev, "mac34", "hpll", 0,
 500                         scu_g6_base + 0x310, 24, 3, 0,
 501                         ast2600_mac_div_table,
 502                         &aspeed_g6_clk_lock);
 503         if (IS_ERR(hw))
 504                 return PTR_ERR(hw);
 505         aspeed_g6_clk_data->hws[ASPEED_CLK_MAC34] = hw;
 506
 507         /* LPC Host (LHCLK) clock divider */
 508         hw = clk_hw_register_divider_table(dev, "lhclk", "hpll", 0,
 509                         scu_g6_base + ASPEED_G6_CLK_SELECTION1, 20, 3, 0,
 510                         ast2600_div_table,
 511                         &aspeed_g6_clk_lock);
 512         if (IS_ERR(hw))
 513                 return PTR_ERR(hw);
 514         aspeed_g6_clk_data->hws[ASPEED_CLK_LHCLK] = hw;
 515
 516         /* gfx d1clk : use dp clk */
 517         regmap_update_bits(map, ASPEED_G6_CLK_SELECTION1, GENMASK(10, 8), BIT(10));
 518         /* SoC Display clock selection */
 519         hw = clk_hw_register_mux(dev, "d1clk", d1clk_parent_names,
 520                         ARRAY_SIZE(d1clk_parent_names), 0,
 521                         scu_g6_base + ASPEED_G6_CLK_SELECTION1, 8, 3, 0,
 522                         &aspeed_g6_clk_lock);
 523         if (IS_ERR(hw))
 524                 return PTR_ERR(hw);
 525         aspeed_g6_clk_data->hws[ASPEED_CLK_D1CLK] = hw;
 526
 527         /* d1 clk div 0x308[17:15] x [14:12] - 8,7,6,5,4,3,2,1 */
 528         regmap_write(map, 0x308, 0x12000); /* 3x3 = 9 */
 529
 530         /* P-Bus (BCLK) clock divider */
 531         hw = clk_hw_register_divider_table(dev, "bclk", "hpll", 0,
 532                         scu_g6_base + ASPEED_G6_CLK_SELECTION1, 20, 3, 0,
 533                         ast2600_div_table,
 534                         &aspeed_g6_clk_lock);
 535         if (IS_ERR(hw))
 536                 return PTR_ERR(hw);
 537         aspeed_g6_clk_data->hws[ASPEED_CLK_BCLK] = hw;
 538
 539         /* Video Capture clock selection */
 540         hw = clk_hw_register_mux(dev, "vclk", vclk_parent_names,
 541                         ARRAY_SIZE(vclk_parent_names), 0,
 542                         scu_g6_base + ASPEED_G6_CLK_SELECTION2, 12, 3, 0,
 543                         &aspeed_g6_clk_lock);
 544         if (IS_ERR(hw))
 545                 return PTR_ERR(hw);
 546         aspeed_g6_clk_data->hws[ASPEED_CLK_VCLK] = hw;
 547
 548         /* Video Engine clock divider */
 549         hw = clk_hw_register_divider_table(dev, "eclk", NULL, 0,
 550                         scu_g6_base + ASPEED_G6_CLK_SELECTION1, 28, 3, 0,
 551                         ast2600_eclk_div_table,
 552                         &aspeed_g6_clk_lock);
 553         if (IS_ERR(hw))
 554                 return PTR_ERR(hw);
 555         aspeed_g6_clk_data->hws[ASPEED_CLK_ECLK] = hw;
 556
 557         for (i = 0; i < ARRAY_SIZE(aspeed_g6_gates); i++) {
 558                 const struct aspeed_gate_data *gd = &aspeed_g6_gates[i];
 559                 u32 gate_flags;
 560
 561                 /*
 562                  * Special case: the USB port 1 clock (bit 14) is always
 563                  * working the opposite way from the other ones.
 564                  */
 565                 gate_flags = (gd->clock_idx == 14) ? 0 : CLK_GATE_SET_TO_DISABLE;
 566                 hw = aspeed_g6_clk_hw_register_gate(dev,
 567                                 gd->name,
 568                                 gd->parent_name,
 569                                 gd->flags,
 570                                 map,
 571                                 gd->clock_idx,
 572                                 gd->reset_idx,
 573                                 gate_flags,
 574                                 &aspeed_g6_clk_lock);
 575                 if (IS_ERR(hw))
 576                         return PTR_ERR(hw);
 577                 aspeed_g6_clk_data->hws[i] = hw;
 578         }
 579
 580         return 0;
 581 };
 582
 583 static const struct of_device_id aspeed_g6_clk_dt_ids[] = {
 584         { .compatible = "aspeed,ast2600-scu" },
 585         { }
 586 };
 587
 588 static struct platform_driver aspeed_g6_clk_driver = {
 589         .probe  = aspeed_g6_clk_probe,
 590         .driver = {
 591                 .name = "ast2600-clk",
 592                 .of_match_table = aspeed_g6_clk_dt_ids,
 593                 .suppress_bind_attrs = true,
 594         },
 595 };
 596 builtin_platform_driver(aspeed_g6_clk_driver);
 597
 598 static const u32 ast2600_a0_axi_ahb_div_table[] = {
 599         2, 2, 3, 5,
 600 };
 601
 602 static const u32 ast2600_a1_axi_ahb_div_table[] = {
 603         4, 6, 2, 4,
 604 };
 605
 606 static void __init aspeed_g6_cc(struct regmap *map)
 607 {
 608         struct clk_hw *hw;
 609         u32 val, div, chip_id, axi_div, ahb_div;
 610
 611         clk_hw_register_fixed_rate(NULL, "clkin", NULL, 0, 25000000);
 612
 613         /*
 614          * High-speed PLL clock derived from the crystal. This the CPU clock,
 615          * and we assume that it is enabled
 616          */
 617         regmap_read(map, ASPEED_HPLL_PARAM, &val);
 618         aspeed_g6_clk_data->hws[ASPEED_CLK_HPLL] = ast2600_calc_pll("hpll", val);
 619
 620         regmap_read(map, ASPEED_MPLL_PARAM, &val);
 621         aspeed_g6_clk_data->hws[ASPEED_CLK_MPLL] = ast2600_calc_pll("mpll", val);
 622
 623         regmap_read(map, ASPEED_DPLL_PARAM, &val);
 624         aspeed_g6_clk_data->hws[ASPEED_CLK_DPLL] = ast2600_calc_pll("dpll", val);
 625
 626         regmap_read(map, ASPEED_EPLL_PARAM, &val);
 627         aspeed_g6_clk_data->hws[ASPEED_CLK_EPLL] = ast2600_calc_pll("epll", val);
 628
 629         regmap_read(map, ASPEED_APLL_PARAM, &val);
 630         aspeed_g6_clk_data->hws[ASPEED_CLK_APLL] = ast2600_calc_apll("apll", val);
 631
 632         /* Strap bits 12:11 define the AXI/AHB clock frequency ratio (aka HCLK)*/
 633         regmap_read(map, ASPEED_G6_STRAP1, &val);
 634         if (val & BIT(16))
 635                 axi_div = 1;
 636         else
 637                 axi_div = 2;
 638
 639         regmap_read(map, ASPEED_G6_SILICON_REV, &chip_id);
 640         if (chip_id & BIT(16))
 641                 ahb_div = ast2600_a1_axi_ahb_div_table[(val >> 11) & 0x3];
 642         else
 643                 ahb_div = ast2600_a0_axi_ahb_div_table[(val >> 11) & 0x3];
 644
 645         hw = clk_hw_register_fixed_factor(NULL, "ahb", "hpll", 0, 1, axi_div * ahb_div);
 646         aspeed_g6_clk_data->hws[ASPEED_CLK_AHB] = hw;
 647
 648         regmap_read(map, ASPEED_G6_CLK_SELECTION1, &val);
 649         val = (val >> 23) & 0x7;
 650         div = 4 * (val + 1);
 651         hw = clk_hw_register_fixed_factor(NULL, "apb1", "hpll", 0, 1, div);
 652         aspeed_g6_clk_data->hws[ASPEED_CLK_APB1] = hw;
 653
 654         regmap_read(map, ASPEED_G6_CLK_SELECTION4, &val);
 655         val = (val >> 9) & 0x7;
 656         div = 2 * (val + 1);
 657         hw = clk_hw_register_fixed_factor(NULL, "apb2", "ahb", 0, 1, div);
 658         aspeed_g6_clk_data->hws[ASPEED_CLK_APB2] = hw;
 659
 660         /* USB 2.0 port1 phy 40MHz clock */
 661         hw = clk_hw_register_fixed_rate(NULL, "usb-phy-40m", NULL, 0, 40000000);
 662         aspeed_g6_clk_data->hws[ASPEED_CLK_USBPHY_40M] = hw;
 663 };
 664
 665 static void __init aspeed_g6_cc_init(struct device_node *np)
 666 {
 667         struct regmap *map;
 668         int ret;
 669         int i;
 670
 671         scu_g6_base = of_iomap(np, 0);
 672         if (!scu_g6_base)
 673                 return;
 674
 675         aspeed_g6_clk_data = kzalloc(struct_size(aspeed_g6_clk_data, hws,
 676                                       ASPEED_G6_NUM_CLKS), GFP_KERNEL);
 677         if (!aspeed_g6_clk_data)
 678                 return;
 679
 680         /*
 681          * This way all clocks fetched before the platform device probes,
 682          * except those we assign here for early use, will be deferred.
 683          */
 684         for (i = 0; i < ASPEED_G6_NUM_CLKS; i++)
 685                 aspeed_g6_clk_data->hws[i] = ERR_PTR(-EPROBE_DEFER);
 686
 687         /*
 688          * We check that the regmap works on this very first access,
 689          * but as this is an MMIO-backed regmap, subsequent regmap
 690          * access is not going to fail and we skip error checks from
 691          * this point.
 692          */
 693         map = syscon_node_to_regmap(np);
 694         if (IS_ERR(map)) {
 695                 pr_err("no syscon regmap\n");
 696                 return;
 697         }
 698
 699         aspeed_g6_cc(map);
 700         aspeed_g6_clk_data->num = ASPEED_G6_NUM_CLKS;
 701         ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, aspeed_g6_clk_data);
 702         if (ret)
 703                 pr_err("failed to add DT provider: %d\n", ret);
 704 };
 705 CLK_OF_DECLARE_DRIVER(aspeed_cc_g6, "aspeed,ast2600-scu", aspeed_g6_cc_init);