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/mod_devicetable.h> 9 #include <linux/of_address.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 /* 19 * This includes the gates (configured from aspeed_g6_gates), plus the 20 * explicitly-configured clocks (ASPEED_CLK_HPLL and up). 21 */ 22 #define ASPEED_G6_NUM_CLKS 72 23 24 #define ASPEED_G6_SILICON_REV 0x014 25 #define CHIP_REVISION_ID GENMASK(23, 16) 26 27 #define ASPEED_G6_RESET_CTRL 0x040 28 #define ASPEED_G6_RESET_CTRL2 0x050 29 30 #define ASPEED_G6_CLK_STOP_CTRL 0x080 31 #define ASPEED_G6_CLK_STOP_CTRL2 0x090 32 33 #define ASPEED_G6_MISC_CTRL 0x0C0 34 #define UART_DIV13_EN BIT(12) 35 36 #define ASPEED_G6_CLK_SELECTION1 0x300 37 #define ASPEED_G6_CLK_SELECTION2 0x304 38 #define ASPEED_G6_CLK_SELECTION4 0x310 39 #define ASPEED_G6_CLK_SELECTION5 0x314 40 #define I3C_CLK_SELECTION_SHIFT 31 41 #define I3C_CLK_SELECTION BIT(31) 42 #define I3C_CLK_SELECT_HCLK (0 << I3C_CLK_SELECTION_SHIFT) 43 #define I3C_CLK_SELECT_APLL_DIV (1 << I3C_CLK_SELECTION_SHIFT) 44 #define APLL_DIV_SELECTION_SHIFT 28 45 #define APLL_DIV_SELECTION GENMASK(30, 28) 46 #define APLL_DIV_2 (0b001 << APLL_DIV_SELECTION_SHIFT) 47 #define APLL_DIV_3 (0b010 << APLL_DIV_SELECTION_SHIFT) 48 #define APLL_DIV_4 (0b011 << APLL_DIV_SELECTION_SHIFT) 49 #define APLL_DIV_5 (0b100 << APLL_DIV_SELECTION_SHIFT) 50 #define APLL_DIV_6 (0b101 << APLL_DIV_SELECTION_SHIFT) 51 #define APLL_DIV_7 (0b110 << APLL_DIV_SELECTION_SHIFT) 52 #define APLL_DIV_8 (0b111 << APLL_DIV_SELECTION_SHIFT) 53 54 #define ASPEED_HPLL_PARAM 0x200 55 #define ASPEED_APLL_PARAM 0x210 56 #define ASPEED_MPLL_PARAM 0x220 57 #define ASPEED_EPLL_PARAM 0x240 58 #define ASPEED_DPLL_PARAM 0x260 59 60 #define ASPEED_G6_STRAP1 0x500 61 62 #define ASPEED_MAC12_CLK_DLY 0x340 63 #define ASPEED_MAC34_CLK_DLY 0x350 64 65 /* Globally visible clocks */ 66 static DEFINE_SPINLOCK(aspeed_g6_clk_lock); 67 68 /* Keeps track of all clocks */ 69 static struct clk_hw_onecell_data *aspeed_g6_clk_data; 70 71 static void __iomem *scu_g6_base; 72 /* AST2600 revision: A0, A1, A2, etc */ 73 static u8 soc_rev; 74 75 /* 76 * The majority of the clocks in the system are gates paired with a reset 77 * controller that holds the IP in reset; this is represented by the @reset_idx 78 * member of entries here. 79 * 80 * This borrows from clk_hw_register_gate, but registers two 'gates', one 81 * to control the clock enable register and the other to control the reset 82 * IP. This allows us to enforce the ordering: 83 * 84 * 1. Place IP in reset 85 * 2. Enable clock 86 * 3. Delay 87 * 4. Release reset 88 * 89 * Consequently, if reset_idx is set, reset control is implicit: the clock 90 * consumer does not need its own reset handling, as enabling the clock will 91 * also deassert reset. 92 * 93 * There are some gates that do not have an associated reset; these are 94 * handled by using -1 as the index for the reset, and the consumer must 95 * explictly assert/deassert reset lines as required. 96 * 97 * Clocks marked with CLK_IS_CRITICAL: 98 * 99 * ref0 and ref1 are essential for the SoC to operate 100 * mpll is required if SDRAM is used 101 */ 102 static const struct aspeed_gate_data aspeed_g6_gates[] = { 103 /* clk rst name parent flags */ 104 [ASPEED_CLK_GATE_MCLK] = { 0, -1, "mclk-gate", "mpll", CLK_IS_CRITICAL }, /* SDRAM */ 105 [ASPEED_CLK_GATE_ECLK] = { 1, 6, "eclk-gate", "eclk", 0 }, /* Video Engine */ 106 [ASPEED_CLK_GATE_GCLK] = { 2, 7, "gclk-gate", NULL, 0 }, /* 2D engine */ 107 /* vclk parent - dclk/d1clk/hclk/mclk */ 108 [ASPEED_CLK_GATE_VCLK] = { 3, -1, "vclk-gate", NULL, 0 }, /* Video Capture */ 109 [ASPEED_CLK_GATE_BCLK] = { 4, 8, "bclk-gate", "bclk", 0 }, /* PCIe/PCI */ 110 /* From dpll */ 111 [ASPEED_CLK_GATE_DCLK] = { 5, -1, "dclk-gate", NULL, CLK_IS_CRITICAL }, /* DAC */ 112 [ASPEED_CLK_GATE_REF0CLK] = { 6, -1, "ref0clk-gate", "clkin", CLK_IS_CRITICAL }, 113 [ASPEED_CLK_GATE_USBPORT2CLK] = { 7, 3, "usb-port2-gate", NULL, 0 }, /* USB2.0 Host port 2 */ 114 /* Reserved 8 */ 115 [ASPEED_CLK_GATE_USBUHCICLK] = { 9, 15, "usb-uhci-gate", NULL, 0 }, /* USB1.1 (requires port 2 enabled) */ 116 /* From dpll/epll/40mhz usb p1 phy/gpioc6/dp phy pll */ 117 [ASPEED_CLK_GATE_D1CLK] = { 10, 13, "d1clk-gate", "d1clk", 0 }, /* GFX CRT */ 118 /* Reserved 11/12 */ 119 [ASPEED_CLK_GATE_YCLK] = { 13, 4, "yclk-gate", NULL, 0 }, /* HAC */ 120 [ASPEED_CLK_GATE_USBPORT1CLK] = { 14, 14, "usb-port1-gate", NULL, 0 }, /* USB2 hub/USB2 host port 1/USB1.1 dev */ 121 [ASPEED_CLK_GATE_UART5CLK] = { 15, -1, "uart5clk-gate", "uart", 0 }, /* UART5 */ 122 /* Reserved 16/19 */ 123 [ASPEED_CLK_GATE_MAC1CLK] = { 20, 11, "mac1clk-gate", "mac12", 0 }, /* MAC1 */ 124 [ASPEED_CLK_GATE_MAC2CLK] = { 21, 12, "mac2clk-gate", "mac12", 0 }, /* MAC2 */ 125 /* Reserved 22/23 */ 126 [ASPEED_CLK_GATE_RSACLK] = { 24, 4, "rsaclk-gate", NULL, 0 }, /* HAC */ 127 [ASPEED_CLK_GATE_RVASCLK] = { 25, 9, "rvasclk-gate", NULL, 0 }, /* RVAS */ 128 /* Reserved 26 */ 129 [ASPEED_CLK_GATE_EMMCCLK] = { 27, 16, "emmcclk-gate", NULL, 0 }, /* For card clk */ 130 /* Reserved 28/29/30 */ 131 [ASPEED_CLK_GATE_LCLK] = { 32, 32, "lclk-gate", NULL, 0 }, /* LPC */ 132 [ASPEED_CLK_GATE_ESPICLK] = { 33, -1, "espiclk-gate", NULL, 0 }, /* eSPI */ 133 [ASPEED_CLK_GATE_REF1CLK] = { 34, -1, "ref1clk-gate", "clkin", CLK_IS_CRITICAL }, 134 /* Reserved 35 */ 135 [ASPEED_CLK_GATE_SDCLK] = { 36, 56, "sdclk-gate", NULL, 0 }, /* SDIO/SD */ 136 [ASPEED_CLK_GATE_LHCCLK] = { 37, -1, "lhclk-gate", "lhclk", 0 }, /* LPC master/LPC+ */ 137 /* Reserved 38 RSA: no longer used */ 138 /* Reserved 39 */ 139 [ASPEED_CLK_GATE_I3C0CLK] = { 40, 40, "i3c0clk-gate", "i3cclk", 0 }, /* I3C0 */ 140 [ASPEED_CLK_GATE_I3C1CLK] = { 41, 41, "i3c1clk-gate", "i3cclk", 0 }, /* I3C1 */ 141 [ASPEED_CLK_GATE_I3C2CLK] = { 42, 42, "i3c2clk-gate", "i3cclk", 0 }, /* I3C2 */ 142 [ASPEED_CLK_GATE_I3C3CLK] = { 43, 43, "i3c3clk-gate", "i3cclk", 0 }, /* I3C3 */ 143 [ASPEED_CLK_GATE_I3C4CLK] = { 44, 44, "i3c4clk-gate", "i3cclk", 0 }, /* I3C4 */ 144 [ASPEED_CLK_GATE_I3C5CLK] = { 45, 45, "i3c5clk-gate", "i3cclk", 0 }, /* I3C5 */ 145 /* Reserved: 46 & 47 */ 146 [ASPEED_CLK_GATE_UART1CLK] = { 48, -1, "uart1clk-gate", "uart", 0 }, /* UART1 */ 147 [ASPEED_CLK_GATE_UART2CLK] = { 49, -1, "uart2clk-gate", "uart", 0 }, /* UART2 */ 148 [ASPEED_CLK_GATE_UART3CLK] = { 50, -1, "uart3clk-gate", "uart", 0 }, /* UART3 */ 149 [ASPEED_CLK_GATE_UART4CLK] = { 51, -1, "uart4clk-gate", "uart", 0 }, /* UART4 */ 150 [ASPEED_CLK_GATE_MAC3CLK] = { 52, 52, "mac3clk-gate", "mac34", 0 }, /* MAC3 */ 151 [ASPEED_CLK_GATE_MAC4CLK] = { 53, 53, "mac4clk-gate", "mac34", 0 }, /* MAC4 */ 152 [ASPEED_CLK_GATE_UART6CLK] = { 54, -1, "uart6clk-gate", "uartx", 0 }, /* UART6 */ 153 [ASPEED_CLK_GATE_UART7CLK] = { 55, -1, "uart7clk-gate", "uartx", 0 }, /* UART7 */ 154 [ASPEED_CLK_GATE_UART8CLK] = { 56, -1, "uart8clk-gate", "uartx", 0 }, /* UART8 */ 155 [ASPEED_CLK_GATE_UART9CLK] = { 57, -1, "uart9clk-gate", "uartx", 0 }, /* UART9 */ 156 [ASPEED_CLK_GATE_UART10CLK] = { 58, -1, "uart10clk-gate", "uartx", 0 }, /* UART10 */ 157 [ASPEED_CLK_GATE_UART11CLK] = { 59, -1, "uart11clk-gate", "uartx", 0 }, /* UART11 */ 158 [ASPEED_CLK_GATE_UART12CLK] = { 60, -1, "uart12clk-gate", "uartx", 0 }, /* UART12 */ 159 [ASPEED_CLK_GATE_UART13CLK] = { 61, -1, "uart13clk-gate", "uartx", 0 }, /* UART13 */ 160 [ASPEED_CLK_GATE_FSICLK] = { 62, 59, "fsiclk-gate", NULL, 0 }, /* FSI */ 161 }; 162 163 static const struct clk_div_table ast2600_eclk_div_table[] = { 164 { 0x0, 2 }, 165 { 0x1, 2 }, 166 { 0x2, 3 }, 167 { 0x3, 4 }, 168 { 0x4, 5 }, 169 { 0x5, 6 }, 170 { 0x6, 7 }, 171 { 0x7, 8 }, 172 { 0 } 173 }; 174 175 static const struct clk_div_table ast2600_emmc_extclk_div_table[] = { 176 { 0x0, 2 }, 177 { 0x1, 4 }, 178 { 0x2, 6 }, 179 { 0x3, 8 }, 180 { 0x4, 10 }, 181 { 0x5, 12 }, 182 { 0x6, 14 }, 183 { 0x7, 16 }, 184 { 0 } 185 }; 186 187 static const struct clk_div_table ast2600_mac_div_table[] = { 188 { 0x0, 4 }, 189 { 0x1, 4 }, 190 { 0x2, 6 }, 191 { 0x3, 8 }, 192 { 0x4, 10 }, 193 { 0x5, 12 }, 194 { 0x6, 14 }, 195 { 0x7, 16 }, 196 { 0 } 197 }; 198 199 static const struct clk_div_table ast2600_div_table[] = { 200 { 0x0, 4 }, 201 { 0x1, 8 }, 202 { 0x2, 12 }, 203 { 0x3, 16 }, 204 { 0x4, 20 }, 205 { 0x5, 24 }, 206 { 0x6, 28 }, 207 { 0x7, 32 }, 208 { 0 } 209 }; 210 211 /* For hpll/dpll/epll/mpll */ 212 static struct clk_hw *ast2600_calc_pll(const char *name, u32 val) 213 { 214 unsigned int mult, div; 215 216 if (val & BIT(24)) { 217 /* Pass through mode */ 218 mult = div = 1; 219 } else { 220 /* F = 25Mhz * [(M + 2) / (n + 1)] / (p + 1) */ 221 u32 m = val & 0x1fff; 222 u32 n = (val >> 13) & 0x3f; 223 u32 p = (val >> 19) & 0xf; 224 mult = (m + 1) / (n + 1); 225 div = (p + 1); 226 } 227 return clk_hw_register_fixed_factor(NULL, name, "clkin", 0, 228 mult, div); 229 }; 230 231 static struct clk_hw *ast2600_calc_apll(const char *name, u32 val) 232 { 233 unsigned int mult, div; 234 235 if (soc_rev >= 2) { 236 if (val & BIT(24)) { 237 /* Pass through mode */ 238 mult = div = 1; 239 } else { 240 /* F = 25Mhz * [(m + 1) / (n + 1)] / (p + 1) */ 241 u32 m = val & 0x1fff; 242 u32 n = (val >> 13) & 0x3f; 243 u32 p = (val >> 19) & 0xf; 244 245 mult = (m + 1); 246 div = (n + 1) * (p + 1); 247 } 248 } else { 249 if (val & BIT(20)) { 250 /* Pass through mode */ 251 mult = div = 1; 252 } else { 253 /* F = 25Mhz * (2-od) * [(m + 2) / (n + 1)] */ 254 u32 m = (val >> 5) & 0x3f; 255 u32 od = (val >> 4) & 0x1; 256 u32 n = val & 0xf; 257 258 mult = (2 - od) * (m + 2); 259 div = n + 1; 260 } 261 } 262 return clk_hw_register_fixed_factor(NULL, name, "clkin", 0, 263 mult, div); 264 }; 265 266 static u32 get_bit(u8 idx) 267 { 268 return BIT(idx % 32); 269 } 270 271 static u32 get_reset_reg(struct aspeed_clk_gate *gate) 272 { 273 if (gate->reset_idx < 32) 274 return ASPEED_G6_RESET_CTRL; 275 276 return ASPEED_G6_RESET_CTRL2; 277 } 278 279 static u32 get_clock_reg(struct aspeed_clk_gate *gate) 280 { 281 if (gate->clock_idx < 32) 282 return ASPEED_G6_CLK_STOP_CTRL; 283 284 return ASPEED_G6_CLK_STOP_CTRL2; 285 } 286 287 static int aspeed_g6_clk_is_enabled(struct clk_hw *hw) 288 { 289 struct aspeed_clk_gate *gate = to_aspeed_clk_gate(hw); 290 u32 clk = get_bit(gate->clock_idx); 291 u32 rst = get_bit(gate->reset_idx); 292 u32 reg; 293 u32 enval; 294 295 /* 296 * If the IP is in reset, treat the clock as not enabled, 297 * this happens with some clocks such as the USB one when 298 * coming from cold reset. Without this, aspeed_clk_enable() 299 * will fail to lift the reset. 300 */ 301 if (gate->reset_idx >= 0) { 302 regmap_read(gate->map, get_reset_reg(gate), ®); 303 304 if (reg & rst) 305 return 0; 306 } 307 308 regmap_read(gate->map, get_clock_reg(gate), ®); 309 310 enval = (gate->flags & CLK_GATE_SET_TO_DISABLE) ? 0 : clk; 311 312 return ((reg & clk) == enval) ? 1 : 0; 313 } 314 315 static int aspeed_g6_clk_enable(struct clk_hw *hw) 316 { 317 struct aspeed_clk_gate *gate = to_aspeed_clk_gate(hw); 318 unsigned long flags; 319 u32 clk = get_bit(gate->clock_idx); 320 u32 rst = get_bit(gate->reset_idx); 321 322 spin_lock_irqsave(gate->lock, flags); 323 324 if (aspeed_g6_clk_is_enabled(hw)) { 325 spin_unlock_irqrestore(gate->lock, flags); 326 return 0; 327 } 328 329 if (gate->reset_idx >= 0) { 330 /* Put IP in reset */ 331 regmap_write(gate->map, get_reset_reg(gate), rst); 332 /* Delay 100us */ 333 udelay(100); 334 } 335 336 /* Enable clock */ 337 if (gate->flags & CLK_GATE_SET_TO_DISABLE) { 338 /* Clock is clear to enable, so use set to clear register */ 339 regmap_write(gate->map, get_clock_reg(gate) + 0x04, clk); 340 } else { 341 /* Clock is set to enable, so use write to set register */ 342 regmap_write(gate->map, get_clock_reg(gate), clk); 343 } 344 345 if (gate->reset_idx >= 0) { 346 /* A delay of 10ms is specified by the ASPEED docs */ 347 mdelay(10); 348 /* Take IP out of reset */ 349 regmap_write(gate->map, get_reset_reg(gate) + 0x4, rst); 350 } 351 352 spin_unlock_irqrestore(gate->lock, flags); 353 354 return 0; 355 } 356 357 static void aspeed_g6_clk_disable(struct clk_hw *hw) 358 { 359 struct aspeed_clk_gate *gate = to_aspeed_clk_gate(hw); 360 unsigned long flags; 361 u32 clk = get_bit(gate->clock_idx); 362 363 spin_lock_irqsave(gate->lock, flags); 364 365 if (gate->flags & CLK_GATE_SET_TO_DISABLE) { 366 regmap_write(gate->map, get_clock_reg(gate), clk); 367 } else { 368 /* Use set to clear register */ 369 regmap_write(gate->map, get_clock_reg(gate) + 0x4, clk); 370 } 371 372 spin_unlock_irqrestore(gate->lock, flags); 373 } 374 375 static const struct clk_ops aspeed_g6_clk_gate_ops = { 376 .enable = aspeed_g6_clk_enable, 377 .disable = aspeed_g6_clk_disable, 378 .is_enabled = aspeed_g6_clk_is_enabled, 379 }; 380 381 static int aspeed_g6_reset_deassert(struct reset_controller_dev *rcdev, 382 unsigned long id) 383 { 384 struct aspeed_reset *ar = to_aspeed_reset(rcdev); 385 u32 rst = get_bit(id); 386 u32 reg = id >= 32 ? ASPEED_G6_RESET_CTRL2 : ASPEED_G6_RESET_CTRL; 387 388 /* Use set to clear register */ 389 return regmap_write(ar->map, reg + 0x04, rst); 390 } 391 392 static int aspeed_g6_reset_assert(struct reset_controller_dev *rcdev, 393 unsigned long id) 394 { 395 struct aspeed_reset *ar = to_aspeed_reset(rcdev); 396 u32 rst = get_bit(id); 397 u32 reg = id >= 32 ? ASPEED_G6_RESET_CTRL2 : ASPEED_G6_RESET_CTRL; 398 399 return regmap_write(ar->map, reg, rst); 400 } 401 402 static int aspeed_g6_reset_status(struct reset_controller_dev *rcdev, 403 unsigned long id) 404 { 405 struct aspeed_reset *ar = to_aspeed_reset(rcdev); 406 int ret; 407 u32 val; 408 u32 rst = get_bit(id); 409 u32 reg = id >= 32 ? ASPEED_G6_RESET_CTRL2 : ASPEED_G6_RESET_CTRL; 410 411 ret = regmap_read(ar->map, reg, &val); 412 if (ret) 413 return ret; 414 415 return !!(val & rst); 416 } 417 418 static const struct reset_control_ops aspeed_g6_reset_ops = { 419 .assert = aspeed_g6_reset_assert, 420 .deassert = aspeed_g6_reset_deassert, 421 .status = aspeed_g6_reset_status, 422 }; 423 424 static struct clk_hw *aspeed_g6_clk_hw_register_gate(struct device *dev, 425 const char *name, const char *parent_name, unsigned long flags, 426 struct regmap *map, u8 clock_idx, u8 reset_idx, 427 u8 clk_gate_flags, spinlock_t *lock) 428 { 429 struct aspeed_clk_gate *gate; 430 struct clk_init_data init; 431 struct clk_hw *hw; 432 int ret; 433 434 gate = kzalloc(sizeof(*gate), GFP_KERNEL); 435 if (!gate) 436 return ERR_PTR(-ENOMEM); 437 438 init.name = name; 439 init.ops = &aspeed_g6_clk_gate_ops; 440 init.flags = flags; 441 init.parent_names = parent_name ? &parent_name : NULL; 442 init.num_parents = parent_name ? 1 : 0; 443 444 gate->map = map; 445 gate->clock_idx = clock_idx; 446 gate->reset_idx = reset_idx; 447 gate->flags = clk_gate_flags; 448 gate->lock = lock; 449 gate->hw.init = &init; 450 451 hw = &gate->hw; 452 ret = clk_hw_register(dev, hw); 453 if (ret) { 454 kfree(gate); 455 hw = ERR_PTR(ret); 456 } 457 458 return hw; 459 } 460 461 static const char *const emmc_extclk_parent_names[] = { 462 "emmc_extclk_hpll_in", 463 "mpll", 464 }; 465 466 static const char * const vclk_parent_names[] = { 467 "dpll", 468 "d1pll", 469 "hclk", 470 "mclk", 471 }; 472 473 static const char * const d1clk_parent_names[] = { 474 "dpll", 475 "epll", 476 "usb-phy-40m", 477 "gpioc6_clkin", 478 "dp_phy_pll", 479 }; 480 481 static int aspeed_g6_clk_probe(struct platform_device *pdev) 482 { 483 struct device *dev = &pdev->dev; 484 struct aspeed_reset *ar; 485 struct regmap *map; 486 struct clk_hw *hw; 487 u32 val, rate; 488 int i, ret; 489 490 map = syscon_node_to_regmap(dev->of_node); 491 if (IS_ERR(map)) { 492 dev_err(dev, "no syscon regmap\n"); 493 return PTR_ERR(map); 494 } 495 496 ar = devm_kzalloc(dev, sizeof(*ar), GFP_KERNEL); 497 if (!ar) 498 return -ENOMEM; 499 500 ar->map = map; 501 502 ar->rcdev.owner = THIS_MODULE; 503 ar->rcdev.nr_resets = 64; 504 ar->rcdev.ops = &aspeed_g6_reset_ops; 505 ar->rcdev.of_node = dev->of_node; 506 507 ret = devm_reset_controller_register(dev, &ar->rcdev); 508 if (ret) { 509 dev_err(dev, "could not register reset controller\n"); 510 return ret; 511 } 512 513 /* UART clock div13 setting */ 514 regmap_read(map, ASPEED_G6_MISC_CTRL, &val); 515 if (val & UART_DIV13_EN) 516 rate = 24000000 / 13; 517 else 518 rate = 24000000; 519 hw = clk_hw_register_fixed_rate(dev, "uart", NULL, 0, rate); 520 if (IS_ERR(hw)) 521 return PTR_ERR(hw); 522 aspeed_g6_clk_data->hws[ASPEED_CLK_UART] = hw; 523 524 /* UART6~13 clock div13 setting */ 525 regmap_read(map, 0x80, &val); 526 if (val & BIT(31)) 527 rate = 24000000 / 13; 528 else 529 rate = 24000000; 530 hw = clk_hw_register_fixed_rate(dev, "uartx", NULL, 0, rate); 531 if (IS_ERR(hw)) 532 return PTR_ERR(hw); 533 aspeed_g6_clk_data->hws[ASPEED_CLK_UARTX] = hw; 534 535 /* EMMC ext clock */ 536 hw = clk_hw_register_fixed_factor(dev, "emmc_extclk_hpll_in", "hpll", 537 0, 1, 2); 538 if (IS_ERR(hw)) 539 return PTR_ERR(hw); 540 541 hw = clk_hw_register_mux(dev, "emmc_extclk_mux", 542 emmc_extclk_parent_names, 543 ARRAY_SIZE(emmc_extclk_parent_names), 0, 544 scu_g6_base + ASPEED_G6_CLK_SELECTION1, 11, 1, 545 0, &aspeed_g6_clk_lock); 546 if (IS_ERR(hw)) 547 return PTR_ERR(hw); 548 549 hw = clk_hw_register_gate(dev, "emmc_extclk_gate", "emmc_extclk_mux", 550 0, scu_g6_base + ASPEED_G6_CLK_SELECTION1, 551 15, 0, &aspeed_g6_clk_lock); 552 if (IS_ERR(hw)) 553 return PTR_ERR(hw); 554 555 hw = clk_hw_register_divider_table(dev, "emmc_extclk", 556 "emmc_extclk_gate", 0, 557 scu_g6_base + 558 ASPEED_G6_CLK_SELECTION1, 12, 559 3, 0, ast2600_emmc_extclk_div_table, 560 &aspeed_g6_clk_lock); 561 if (IS_ERR(hw)) 562 return PTR_ERR(hw); 563 aspeed_g6_clk_data->hws[ASPEED_CLK_EMMC] = hw; 564 565 /* SD/SDIO clock divider and gate */ 566 hw = clk_hw_register_gate(dev, "sd_extclk_gate", "hpll", 0, 567 scu_g6_base + ASPEED_G6_CLK_SELECTION4, 31, 0, 568 &aspeed_g6_clk_lock); 569 if (IS_ERR(hw)) 570 return PTR_ERR(hw); 571 hw = clk_hw_register_divider_table(dev, "sd_extclk", "sd_extclk_gate", 572 0, scu_g6_base + ASPEED_G6_CLK_SELECTION4, 28, 3, 0, 573 ast2600_div_table, 574 &aspeed_g6_clk_lock); 575 if (IS_ERR(hw)) 576 return PTR_ERR(hw); 577 aspeed_g6_clk_data->hws[ASPEED_CLK_SDIO] = hw; 578 579 /* MAC1/2 RMII 50MHz RCLK */ 580 hw = clk_hw_register_fixed_rate(dev, "mac12rclk", "hpll", 0, 50000000); 581 if (IS_ERR(hw)) 582 return PTR_ERR(hw); 583 584 /* MAC1/2 AHB bus clock divider */ 585 hw = clk_hw_register_divider_table(dev, "mac12", "hpll", 0, 586 scu_g6_base + ASPEED_G6_CLK_SELECTION1, 16, 3, 0, 587 ast2600_mac_div_table, 588 &aspeed_g6_clk_lock); 589 if (IS_ERR(hw)) 590 return PTR_ERR(hw); 591 aspeed_g6_clk_data->hws[ASPEED_CLK_MAC12] = hw; 592 593 /* RMII1 50MHz (RCLK) output enable */ 594 hw = clk_hw_register_gate(dev, "mac1rclk", "mac12rclk", 0, 595 scu_g6_base + ASPEED_MAC12_CLK_DLY, 29, 0, 596 &aspeed_g6_clk_lock); 597 if (IS_ERR(hw)) 598 return PTR_ERR(hw); 599 aspeed_g6_clk_data->hws[ASPEED_CLK_MAC1RCLK] = hw; 600 601 /* RMII2 50MHz (RCLK) output enable */ 602 hw = clk_hw_register_gate(dev, "mac2rclk", "mac12rclk", 0, 603 scu_g6_base + ASPEED_MAC12_CLK_DLY, 30, 0, 604 &aspeed_g6_clk_lock); 605 if (IS_ERR(hw)) 606 return PTR_ERR(hw); 607 aspeed_g6_clk_data->hws[ASPEED_CLK_MAC2RCLK] = hw; 608 609 /* MAC1/2 RMII 50MHz RCLK */ 610 hw = clk_hw_register_fixed_rate(dev, "mac34rclk", "hclk", 0, 50000000); 611 if (IS_ERR(hw)) 612 return PTR_ERR(hw); 613 614 /* MAC3/4 AHB bus clock divider */ 615 hw = clk_hw_register_divider_table(dev, "mac34", "hpll", 0, 616 scu_g6_base + 0x310, 24, 3, 0, 617 ast2600_mac_div_table, 618 &aspeed_g6_clk_lock); 619 if (IS_ERR(hw)) 620 return PTR_ERR(hw); 621 aspeed_g6_clk_data->hws[ASPEED_CLK_MAC34] = hw; 622 623 /* RMII3 50MHz (RCLK) output enable */ 624 hw = clk_hw_register_gate(dev, "mac3rclk", "mac34rclk", 0, 625 scu_g6_base + ASPEED_MAC34_CLK_DLY, 29, 0, 626 &aspeed_g6_clk_lock); 627 if (IS_ERR(hw)) 628 return PTR_ERR(hw); 629 aspeed_g6_clk_data->hws[ASPEED_CLK_MAC3RCLK] = hw; 630 631 /* RMII4 50MHz (RCLK) output enable */ 632 hw = clk_hw_register_gate(dev, "mac4rclk", "mac34rclk", 0, 633 scu_g6_base + ASPEED_MAC34_CLK_DLY, 30, 0, 634 &aspeed_g6_clk_lock); 635 if (IS_ERR(hw)) 636 return PTR_ERR(hw); 637 aspeed_g6_clk_data->hws[ASPEED_CLK_MAC4RCLK] = hw; 638 639 /* LPC Host (LHCLK) clock divider */ 640 hw = clk_hw_register_divider_table(dev, "lhclk", "hpll", 0, 641 scu_g6_base + ASPEED_G6_CLK_SELECTION1, 20, 3, 0, 642 ast2600_div_table, 643 &aspeed_g6_clk_lock); 644 if (IS_ERR(hw)) 645 return PTR_ERR(hw); 646 aspeed_g6_clk_data->hws[ASPEED_CLK_LHCLK] = hw; 647 648 /* gfx d1clk : use dp clk */ 649 regmap_update_bits(map, ASPEED_G6_CLK_SELECTION1, GENMASK(10, 8), BIT(10)); 650 /* SoC Display clock selection */ 651 hw = clk_hw_register_mux(dev, "d1clk", d1clk_parent_names, 652 ARRAY_SIZE(d1clk_parent_names), 0, 653 scu_g6_base + ASPEED_G6_CLK_SELECTION1, 8, 3, 0, 654 &aspeed_g6_clk_lock); 655 if (IS_ERR(hw)) 656 return PTR_ERR(hw); 657 aspeed_g6_clk_data->hws[ASPEED_CLK_D1CLK] = hw; 658 659 /* d1 clk div 0x308[17:15] x [14:12] - 8,7,6,5,4,3,2,1 */ 660 regmap_write(map, 0x308, 0x12000); /* 3x3 = 9 */ 661 662 /* P-Bus (BCLK) clock divider */ 663 hw = clk_hw_register_divider_table(dev, "bclk", "epll", 0, 664 scu_g6_base + ASPEED_G6_CLK_SELECTION1, 20, 3, 0, 665 ast2600_div_table, 666 &aspeed_g6_clk_lock); 667 if (IS_ERR(hw)) 668 return PTR_ERR(hw); 669 aspeed_g6_clk_data->hws[ASPEED_CLK_BCLK] = hw; 670 671 /* Video Capture clock selection */ 672 hw = clk_hw_register_mux(dev, "vclk", vclk_parent_names, 673 ARRAY_SIZE(vclk_parent_names), 0, 674 scu_g6_base + ASPEED_G6_CLK_SELECTION2, 12, 3, 0, 675 &aspeed_g6_clk_lock); 676 if (IS_ERR(hw)) 677 return PTR_ERR(hw); 678 aspeed_g6_clk_data->hws[ASPEED_CLK_VCLK] = hw; 679 680 /* Video Engine clock divider */ 681 hw = clk_hw_register_divider_table(dev, "eclk", NULL, 0, 682 scu_g6_base + ASPEED_G6_CLK_SELECTION1, 28, 3, 0, 683 ast2600_eclk_div_table, 684 &aspeed_g6_clk_lock); 685 if (IS_ERR(hw)) 686 return PTR_ERR(hw); 687 aspeed_g6_clk_data->hws[ASPEED_CLK_ECLK] = hw; 688 689 for (i = 0; i < ARRAY_SIZE(aspeed_g6_gates); i++) { 690 const struct aspeed_gate_data *gd = &aspeed_g6_gates[i]; 691 u32 gate_flags; 692 693 if (!gd->name) 694 continue; 695 696 /* 697 * Special case: the USB port 1 clock (bit 14) is always 698 * working the opposite way from the other ones. 699 */ 700 gate_flags = (gd->clock_idx == 14) ? 0 : CLK_GATE_SET_TO_DISABLE; 701 hw = aspeed_g6_clk_hw_register_gate(dev, 702 gd->name, 703 gd->parent_name, 704 gd->flags, 705 map, 706 gd->clock_idx, 707 gd->reset_idx, 708 gate_flags, 709 &aspeed_g6_clk_lock); 710 if (IS_ERR(hw)) 711 return PTR_ERR(hw); 712 aspeed_g6_clk_data->hws[i] = hw; 713 } 714 715 return 0; 716 }; 717 718 static const struct of_device_id aspeed_g6_clk_dt_ids[] = { 719 { .compatible = "aspeed,ast2600-scu" }, 720 { } 721 }; 722 723 static struct platform_driver aspeed_g6_clk_driver = { 724 .probe = aspeed_g6_clk_probe, 725 .driver = { 726 .name = "ast2600-clk", 727 .of_match_table = aspeed_g6_clk_dt_ids, 728 .suppress_bind_attrs = true, 729 }, 730 }; 731 builtin_platform_driver(aspeed_g6_clk_driver); 732 733 static const u32 ast2600_a0_axi_ahb_div_table[] = { 734 2, 2, 3, 5, 735 }; 736 737 static const u32 ast2600_a1_axi_ahb_div0_tbl[] = { 738 3, 2, 3, 4, 739 }; 740 741 static const u32 ast2600_a1_axi_ahb_div1_tbl[] = { 742 3, 4, 6, 8, 743 }; 744 745 static const u32 ast2600_a1_axi_ahb200_tbl[] = { 746 3, 4, 3, 4, 2, 2, 2, 2, 747 }; 748 749 static void __init aspeed_g6_cc(struct regmap *map) 750 { 751 struct clk_hw *hw; 752 u32 val, div, divbits, axi_div, ahb_div; 753 754 clk_hw_register_fixed_rate(NULL, "clkin", NULL, 0, 25000000); 755 756 /* 757 * High-speed PLL clock derived from the crystal. This the CPU clock, 758 * and we assume that it is enabled 759 */ 760 regmap_read(map, ASPEED_HPLL_PARAM, &val); 761 aspeed_g6_clk_data->hws[ASPEED_CLK_HPLL] = ast2600_calc_pll("hpll", val); 762 763 regmap_read(map, ASPEED_MPLL_PARAM, &val); 764 aspeed_g6_clk_data->hws[ASPEED_CLK_MPLL] = ast2600_calc_pll("mpll", val); 765 766 regmap_read(map, ASPEED_DPLL_PARAM, &val); 767 aspeed_g6_clk_data->hws[ASPEED_CLK_DPLL] = ast2600_calc_pll("dpll", val); 768 769 regmap_read(map, ASPEED_EPLL_PARAM, &val); 770 aspeed_g6_clk_data->hws[ASPEED_CLK_EPLL] = ast2600_calc_pll("epll", val); 771 772 regmap_read(map, ASPEED_APLL_PARAM, &val); 773 aspeed_g6_clk_data->hws[ASPEED_CLK_APLL] = ast2600_calc_apll("apll", val); 774 775 /* Strap bits 12:11 define the AXI/AHB clock frequency ratio (aka HCLK)*/ 776 regmap_read(map, ASPEED_G6_STRAP1, &val); 777 if (val & BIT(16)) 778 axi_div = 1; 779 else 780 axi_div = 2; 781 782 divbits = (val >> 11) & 0x3; 783 if (soc_rev >= 1) { 784 if (!divbits) { 785 ahb_div = ast2600_a1_axi_ahb200_tbl[(val >> 8) & 0x3]; 786 if (val & BIT(16)) 787 ahb_div *= 2; 788 } else { 789 if (val & BIT(16)) 790 ahb_div = ast2600_a1_axi_ahb_div1_tbl[divbits]; 791 else 792 ahb_div = ast2600_a1_axi_ahb_div0_tbl[divbits]; 793 } 794 } else { 795 ahb_div = ast2600_a0_axi_ahb_div_table[(val >> 11) & 0x3]; 796 } 797 798 hw = clk_hw_register_fixed_factor(NULL, "ahb", "hpll", 0, 1, axi_div * ahb_div); 799 aspeed_g6_clk_data->hws[ASPEED_CLK_AHB] = hw; 800 801 regmap_read(map, ASPEED_G6_CLK_SELECTION1, &val); 802 val = (val >> 23) & 0x7; 803 div = 4 * (val + 1); 804 hw = clk_hw_register_fixed_factor(NULL, "apb1", "hpll", 0, 1, div); 805 aspeed_g6_clk_data->hws[ASPEED_CLK_APB1] = hw; 806 807 regmap_read(map, ASPEED_G6_CLK_SELECTION4, &val); 808 val = (val >> 9) & 0x7; 809 div = 2 * (val + 1); 810 hw = clk_hw_register_fixed_factor(NULL, "apb2", "ahb", 0, 1, div); 811 aspeed_g6_clk_data->hws[ASPEED_CLK_APB2] = hw; 812 813 /* USB 2.0 port1 phy 40MHz clock */ 814 hw = clk_hw_register_fixed_rate(NULL, "usb-phy-40m", NULL, 0, 40000000); 815 aspeed_g6_clk_data->hws[ASPEED_CLK_USBPHY_40M] = hw; 816 817 /* i3c clock: source from apll, divide by 8 */ 818 regmap_update_bits(map, ASPEED_G6_CLK_SELECTION5, 819 I3C_CLK_SELECTION | APLL_DIV_SELECTION, 820 I3C_CLK_SELECT_APLL_DIV | APLL_DIV_8); 821 822 hw = clk_hw_register_fixed_factor(NULL, "i3cclk", "apll", 0, 1, 8); 823 aspeed_g6_clk_data->hws[ASPEED_CLK_I3C] = hw; 824 }; 825 826 static void __init aspeed_g6_cc_init(struct device_node *np) 827 { 828 struct regmap *map; 829 int ret; 830 int i; 831 832 scu_g6_base = of_iomap(np, 0); 833 if (!scu_g6_base) 834 return; 835 836 soc_rev = (readl(scu_g6_base + ASPEED_G6_SILICON_REV) & CHIP_REVISION_ID) >> 16; 837 838 aspeed_g6_clk_data = kzalloc(struct_size(aspeed_g6_clk_data, hws, 839 ASPEED_G6_NUM_CLKS), GFP_KERNEL); 840 if (!aspeed_g6_clk_data) 841 return; 842 aspeed_g6_clk_data->num = ASPEED_G6_NUM_CLKS; 843 844 /* 845 * This way all clocks fetched before the platform device probes, 846 * except those we assign here for early use, will be deferred. 847 */ 848 for (i = 0; i < ASPEED_G6_NUM_CLKS; i++) 849 aspeed_g6_clk_data->hws[i] = ERR_PTR(-EPROBE_DEFER); 850 851 /* 852 * We check that the regmap works on this very first access, 853 * but as this is an MMIO-backed regmap, subsequent regmap 854 * access is not going to fail and we skip error checks from 855 * this point. 856 */ 857 map = syscon_node_to_regmap(np); 858 if (IS_ERR(map)) { 859 pr_err("no syscon regmap\n"); 860 return; 861 } 862 863 aspeed_g6_cc(map); 864 ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, aspeed_g6_clk_data); 865 if (ret) 866 pr_err("failed to add DT provider: %d\n", ret); 867 }; 868 CLK_OF_DECLARE_DRIVER(aspeed_cc_g6, "aspeed,ast2600-scu", aspeed_g6_cc_init); 869