1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Clk driver for NXP LPC18xx/LPC43xx Clock Generation Unit (CGU) 4 * 5 * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com> 6 */ 7 8 #include <linux/clk-provider.h> 9 #include <linux/delay.h> 10 #include <linux/io.h> 11 #include <linux/kernel.h> 12 #include <linux/of.h> 13 #include <linux/of_address.h> 14 15 #include <dt-bindings/clock/lpc18xx-cgu.h> 16 17 /* Clock Generation Unit (CGU) registers */ 18 #define LPC18XX_CGU_XTAL_OSC_CTRL 0x018 19 #define LPC18XX_CGU_PLL0USB_STAT 0x01c 20 #define LPC18XX_CGU_PLL0USB_CTRL 0x020 21 #define LPC18XX_CGU_PLL0USB_MDIV 0x024 22 #define LPC18XX_CGU_PLL0USB_NP_DIV 0x028 23 #define LPC18XX_CGU_PLL0AUDIO_STAT 0x02c 24 #define LPC18XX_CGU_PLL0AUDIO_CTRL 0x030 25 #define LPC18XX_CGU_PLL0AUDIO_MDIV 0x034 26 #define LPC18XX_CGU_PLL0AUDIO_NP_DIV 0x038 27 #define LPC18XX_CGU_PLL0AUDIO_FRAC 0x03c 28 #define LPC18XX_CGU_PLL1_STAT 0x040 29 #define LPC18XX_CGU_PLL1_CTRL 0x044 30 #define LPC18XX_PLL1_CTRL_FBSEL BIT(6) 31 #define LPC18XX_PLL1_CTRL_DIRECT BIT(7) 32 #define LPC18XX_CGU_IDIV_CTRL(n) (0x048 + (n) * sizeof(u32)) 33 #define LPC18XX_CGU_BASE_CLK(id) (0x05c + (id) * sizeof(u32)) 34 #define LPC18XX_CGU_PLL_CTRL_OFFSET 0x4 35 36 /* PLL0 bits common to both audio and USB PLL */ 37 #define LPC18XX_PLL0_STAT_LOCK BIT(0) 38 #define LPC18XX_PLL0_CTRL_PD BIT(0) 39 #define LPC18XX_PLL0_CTRL_BYPASS BIT(1) 40 #define LPC18XX_PLL0_CTRL_DIRECTI BIT(2) 41 #define LPC18XX_PLL0_CTRL_DIRECTO BIT(3) 42 #define LPC18XX_PLL0_CTRL_CLKEN BIT(4) 43 #define LPC18XX_PLL0_MDIV_MDEC_MASK 0x1ffff 44 #define LPC18XX_PLL0_MDIV_SELP_SHIFT 17 45 #define LPC18XX_PLL0_MDIV_SELI_SHIFT 22 46 #define LPC18XX_PLL0_MSEL_MAX BIT(15) 47 48 /* Register value that gives PLL0 post/pre dividers equal to 1 */ 49 #define LPC18XX_PLL0_NP_DIVS_1 0x00302062 50 51 enum { 52 CLK_SRC_OSC32, 53 CLK_SRC_IRC, 54 CLK_SRC_ENET_RX_CLK, 55 CLK_SRC_ENET_TX_CLK, 56 CLK_SRC_GP_CLKIN, 57 CLK_SRC_RESERVED1, 58 CLK_SRC_OSC, 59 CLK_SRC_PLL0USB, 60 CLK_SRC_PLL0AUDIO, 61 CLK_SRC_PLL1, 62 CLK_SRC_RESERVED2, 63 CLK_SRC_RESERVED3, 64 CLK_SRC_IDIVA, 65 CLK_SRC_IDIVB, 66 CLK_SRC_IDIVC, 67 CLK_SRC_IDIVD, 68 CLK_SRC_IDIVE, 69 CLK_SRC_MAX 70 }; 71 72 static const char *clk_src_names[CLK_SRC_MAX] = { 73 [CLK_SRC_OSC32] = "osc32", 74 [CLK_SRC_IRC] = "irc", 75 [CLK_SRC_ENET_RX_CLK] = "enet_rx_clk", 76 [CLK_SRC_ENET_TX_CLK] = "enet_tx_clk", 77 [CLK_SRC_GP_CLKIN] = "gp_clkin", 78 [CLK_SRC_OSC] = "osc", 79 [CLK_SRC_PLL0USB] = "pll0usb", 80 [CLK_SRC_PLL0AUDIO] = "pll0audio", 81 [CLK_SRC_PLL1] = "pll1", 82 [CLK_SRC_IDIVA] = "idiva", 83 [CLK_SRC_IDIVB] = "idivb", 84 [CLK_SRC_IDIVC] = "idivc", 85 [CLK_SRC_IDIVD] = "idivd", 86 [CLK_SRC_IDIVE] = "idive", 87 }; 88 89 static const char *clk_base_names[BASE_CLK_MAX] = { 90 [BASE_SAFE_CLK] = "base_safe_clk", 91 [BASE_USB0_CLK] = "base_usb0_clk", 92 [BASE_PERIPH_CLK] = "base_periph_clk", 93 [BASE_USB1_CLK] = "base_usb1_clk", 94 [BASE_CPU_CLK] = "base_cpu_clk", 95 [BASE_SPIFI_CLK] = "base_spifi_clk", 96 [BASE_SPI_CLK] = "base_spi_clk", 97 [BASE_PHY_RX_CLK] = "base_phy_rx_clk", 98 [BASE_PHY_TX_CLK] = "base_phy_tx_clk", 99 [BASE_APB1_CLK] = "base_apb1_clk", 100 [BASE_APB3_CLK] = "base_apb3_clk", 101 [BASE_LCD_CLK] = "base_lcd_clk", 102 [BASE_ADCHS_CLK] = "base_adchs_clk", 103 [BASE_SDIO_CLK] = "base_sdio_clk", 104 [BASE_SSP0_CLK] = "base_ssp0_clk", 105 [BASE_SSP1_CLK] = "base_ssp1_clk", 106 [BASE_UART0_CLK] = "base_uart0_clk", 107 [BASE_UART1_CLK] = "base_uart1_clk", 108 [BASE_UART2_CLK] = "base_uart2_clk", 109 [BASE_UART3_CLK] = "base_uart3_clk", 110 [BASE_OUT_CLK] = "base_out_clk", 111 [BASE_AUDIO_CLK] = "base_audio_clk", 112 [BASE_CGU_OUT0_CLK] = "base_cgu_out0_clk", 113 [BASE_CGU_OUT1_CLK] = "base_cgu_out1_clk", 114 }; 115 116 static u32 lpc18xx_cgu_pll0_src_ids[] = { 117 CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK, 118 CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC, 119 CLK_SRC_PLL1, CLK_SRC_IDIVA, CLK_SRC_IDIVB, CLK_SRC_IDIVC, 120 CLK_SRC_IDIVD, CLK_SRC_IDIVE, 121 }; 122 123 static u32 lpc18xx_cgu_pll1_src_ids[] = { 124 CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK, 125 CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC, 126 CLK_SRC_PLL0USB, CLK_SRC_PLL0AUDIO, CLK_SRC_IDIVA, 127 CLK_SRC_IDIVB, CLK_SRC_IDIVC, CLK_SRC_IDIVD, CLK_SRC_IDIVE, 128 }; 129 130 static u32 lpc18xx_cgu_idiva_src_ids[] = { 131 CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK, 132 CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC, 133 CLK_SRC_PLL0USB, CLK_SRC_PLL0AUDIO, CLK_SRC_PLL1 134 }; 135 136 static u32 lpc18xx_cgu_idivbcde_src_ids[] = { 137 CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK, 138 CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC, 139 CLK_SRC_PLL0AUDIO, CLK_SRC_PLL1, CLK_SRC_IDIVA, 140 }; 141 142 static u32 lpc18xx_cgu_base_irc_src_ids[] = {CLK_SRC_IRC}; 143 144 static u32 lpc18xx_cgu_base_usb0_src_ids[] = {CLK_SRC_PLL0USB}; 145 146 static u32 lpc18xx_cgu_base_common_src_ids[] = { 147 CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK, 148 CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC, 149 CLK_SRC_PLL0AUDIO, CLK_SRC_PLL1, CLK_SRC_IDIVA, 150 CLK_SRC_IDIVB, CLK_SRC_IDIVC, CLK_SRC_IDIVD, CLK_SRC_IDIVE, 151 }; 152 153 static u32 lpc18xx_cgu_base_all_src_ids[] = { 154 CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK, 155 CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC, 156 CLK_SRC_PLL0USB, CLK_SRC_PLL0AUDIO, CLK_SRC_PLL1, 157 CLK_SRC_IDIVA, CLK_SRC_IDIVB, CLK_SRC_IDIVC, 158 CLK_SRC_IDIVD, CLK_SRC_IDIVE, 159 }; 160 161 struct lpc18xx_cgu_src_clk_div { 162 u8 clk_id; 163 u8 n_parents; 164 struct clk_divider div; 165 struct clk_mux mux; 166 struct clk_gate gate; 167 }; 168 169 #define LPC1XX_CGU_SRC_CLK_DIV(_id, _width, _table) \ 170 { \ 171 .clk_id = CLK_SRC_ ##_id, \ 172 .n_parents = ARRAY_SIZE(lpc18xx_cgu_ ##_table), \ 173 .div = { \ 174 .shift = 2, \ 175 .width = _width, \ 176 }, \ 177 .mux = { \ 178 .mask = 0x1f, \ 179 .shift = 24, \ 180 .table = lpc18xx_cgu_ ##_table, \ 181 }, \ 182 .gate = { \ 183 .bit_idx = 0, \ 184 .flags = CLK_GATE_SET_TO_DISABLE, \ 185 }, \ 186 } 187 188 static struct lpc18xx_cgu_src_clk_div lpc18xx_cgu_src_clk_divs[] = { 189 LPC1XX_CGU_SRC_CLK_DIV(IDIVA, 2, idiva_src_ids), 190 LPC1XX_CGU_SRC_CLK_DIV(IDIVB, 4, idivbcde_src_ids), 191 LPC1XX_CGU_SRC_CLK_DIV(IDIVC, 4, idivbcde_src_ids), 192 LPC1XX_CGU_SRC_CLK_DIV(IDIVD, 4, idivbcde_src_ids), 193 LPC1XX_CGU_SRC_CLK_DIV(IDIVE, 8, idivbcde_src_ids), 194 }; 195 196 struct lpc18xx_cgu_base_clk { 197 u8 clk_id; 198 u8 n_parents; 199 struct clk_mux mux; 200 struct clk_gate gate; 201 }; 202 203 #define LPC1XX_CGU_BASE_CLK(_id, _table, _flags) \ 204 { \ 205 .clk_id = BASE_ ##_id ##_CLK, \ 206 .n_parents = ARRAY_SIZE(lpc18xx_cgu_ ##_table), \ 207 .mux = { \ 208 .mask = 0x1f, \ 209 .shift = 24, \ 210 .table = lpc18xx_cgu_ ##_table, \ 211 .flags = _flags, \ 212 }, \ 213 .gate = { \ 214 .bit_idx = 0, \ 215 .flags = CLK_GATE_SET_TO_DISABLE, \ 216 }, \ 217 } 218 219 static struct lpc18xx_cgu_base_clk lpc18xx_cgu_base_clks[] = { 220 LPC1XX_CGU_BASE_CLK(SAFE, base_irc_src_ids, CLK_MUX_READ_ONLY), 221 LPC1XX_CGU_BASE_CLK(USB0, base_usb0_src_ids, 0), 222 LPC1XX_CGU_BASE_CLK(PERIPH, base_common_src_ids, 0), 223 LPC1XX_CGU_BASE_CLK(USB1, base_all_src_ids, 0), 224 LPC1XX_CGU_BASE_CLK(CPU, base_common_src_ids, 0), 225 LPC1XX_CGU_BASE_CLK(SPIFI, base_common_src_ids, 0), 226 LPC1XX_CGU_BASE_CLK(SPI, base_common_src_ids, 0), 227 LPC1XX_CGU_BASE_CLK(PHY_RX, base_common_src_ids, 0), 228 LPC1XX_CGU_BASE_CLK(PHY_TX, base_common_src_ids, 0), 229 LPC1XX_CGU_BASE_CLK(APB1, base_common_src_ids, 0), 230 LPC1XX_CGU_BASE_CLK(APB3, base_common_src_ids, 0), 231 LPC1XX_CGU_BASE_CLK(LCD, base_common_src_ids, 0), 232 LPC1XX_CGU_BASE_CLK(ADCHS, base_common_src_ids, 0), 233 LPC1XX_CGU_BASE_CLK(SDIO, base_common_src_ids, 0), 234 LPC1XX_CGU_BASE_CLK(SSP0, base_common_src_ids, 0), 235 LPC1XX_CGU_BASE_CLK(SSP1, base_common_src_ids, 0), 236 LPC1XX_CGU_BASE_CLK(UART0, base_common_src_ids, 0), 237 LPC1XX_CGU_BASE_CLK(UART1, base_common_src_ids, 0), 238 LPC1XX_CGU_BASE_CLK(UART2, base_common_src_ids, 0), 239 LPC1XX_CGU_BASE_CLK(UART3, base_common_src_ids, 0), 240 LPC1XX_CGU_BASE_CLK(OUT, base_all_src_ids, 0), 241 { /* 21 reserved */ }, 242 { /* 22 reserved */ }, 243 { /* 23 reserved */ }, 244 { /* 24 reserved */ }, 245 LPC1XX_CGU_BASE_CLK(AUDIO, base_common_src_ids, 0), 246 LPC1XX_CGU_BASE_CLK(CGU_OUT0, base_all_src_ids, 0), 247 LPC1XX_CGU_BASE_CLK(CGU_OUT1, base_all_src_ids, 0), 248 }; 249 250 struct lpc18xx_pll { 251 struct clk_hw hw; 252 void __iomem *reg; 253 spinlock_t *lock; 254 u8 flags; 255 }; 256 257 #define to_lpc_pll(hw) container_of(hw, struct lpc18xx_pll, hw) 258 259 struct lpc18xx_cgu_pll_clk { 260 u8 clk_id; 261 u8 n_parents; 262 u8 reg_offset; 263 struct clk_mux mux; 264 struct clk_gate gate; 265 struct lpc18xx_pll pll; 266 const struct clk_ops *pll_ops; 267 }; 268 269 #define LPC1XX_CGU_CLK_PLL(_id, _table, _pll_ops) \ 270 { \ 271 .clk_id = CLK_SRC_ ##_id, \ 272 .n_parents = ARRAY_SIZE(lpc18xx_cgu_ ##_table), \ 273 .reg_offset = LPC18XX_CGU_ ##_id ##_STAT, \ 274 .mux = { \ 275 .mask = 0x1f, \ 276 .shift = 24, \ 277 .table = lpc18xx_cgu_ ##_table, \ 278 }, \ 279 .gate = { \ 280 .bit_idx = 0, \ 281 .flags = CLK_GATE_SET_TO_DISABLE, \ 282 }, \ 283 .pll_ops = &lpc18xx_ ##_pll_ops, \ 284 } 285 286 /* 287 * PLL0 uses a special register value encoding. The compute functions below 288 * are taken or derived from the LPC1850 user manual (section 12.6.3.3). 289 */ 290 291 /* Compute PLL0 multiplier from decoded version */ 292 static u32 lpc18xx_pll0_mdec2msel(u32 x) 293 { 294 int i; 295 296 switch (x) { 297 case 0x18003: return 1; 298 case 0x10003: return 2; 299 default: 300 for (i = LPC18XX_PLL0_MSEL_MAX + 1; x != 0x4000 && i > 0; i--) 301 x = ((x ^ x >> 14) & 1) | (x << 1 & 0x7fff); 302 return i; 303 } 304 } 305 /* Compute PLL0 decoded multiplier from binary version */ 306 static u32 lpc18xx_pll0_msel2mdec(u32 msel) 307 { 308 u32 i, x = 0x4000; 309 310 switch (msel) { 311 case 0: return 0; 312 case 1: return 0x18003; 313 case 2: return 0x10003; 314 default: 315 for (i = msel; i <= LPC18XX_PLL0_MSEL_MAX; i++) 316 x = ((x ^ x >> 1) & 1) << 14 | (x >> 1 & 0xffff); 317 return x; 318 } 319 } 320 321 /* Compute PLL0 bandwidth SELI reg from multiplier */ 322 static u32 lpc18xx_pll0_msel2seli(u32 msel) 323 { 324 u32 tmp; 325 326 if (msel > 16384) return 1; 327 if (msel > 8192) return 2; 328 if (msel > 2048) return 4; 329 if (msel >= 501) return 8; 330 if (msel >= 60) { 331 tmp = 1024 / (msel + 9); 332 return ((1024 == (tmp * (msel + 9))) == 0) ? tmp * 4 : (tmp + 1) * 4; 333 } 334 335 return (msel & 0x3c) + 4; 336 } 337 338 /* Compute PLL0 bandwidth SELP reg from multiplier */ 339 static u32 lpc18xx_pll0_msel2selp(u32 msel) 340 { 341 if (msel < 60) 342 return (msel >> 1) + 1; 343 344 return 31; 345 } 346 347 static unsigned long lpc18xx_pll0_recalc_rate(struct clk_hw *hw, 348 unsigned long parent_rate) 349 { 350 struct lpc18xx_pll *pll = to_lpc_pll(hw); 351 u32 ctrl, mdiv, msel, npdiv; 352 353 ctrl = readl(pll->reg + LPC18XX_CGU_PLL0USB_CTRL); 354 mdiv = readl(pll->reg + LPC18XX_CGU_PLL0USB_MDIV); 355 npdiv = readl(pll->reg + LPC18XX_CGU_PLL0USB_NP_DIV); 356 357 if (ctrl & LPC18XX_PLL0_CTRL_BYPASS) 358 return parent_rate; 359 360 if (npdiv != LPC18XX_PLL0_NP_DIVS_1) { 361 pr_warn("%s: pre/post dividers not supported\n", __func__); 362 return 0; 363 } 364 365 msel = lpc18xx_pll0_mdec2msel(mdiv & LPC18XX_PLL0_MDIV_MDEC_MASK); 366 if (msel) 367 return 2 * msel * parent_rate; 368 369 pr_warn("%s: unable to calculate rate\n", __func__); 370 371 return 0; 372 } 373 374 static long lpc18xx_pll0_round_rate(struct clk_hw *hw, unsigned long rate, 375 unsigned long *prate) 376 { 377 unsigned long m; 378 379 if (*prate < rate) { 380 pr_warn("%s: pll dividers not supported\n", __func__); 381 return -EINVAL; 382 } 383 384 m = DIV_ROUND_UP_ULL(*prate, rate * 2); 385 if (m <= 0 && m > LPC18XX_PLL0_MSEL_MAX) { 386 pr_warn("%s: unable to support rate %lu\n", __func__, rate); 387 return -EINVAL; 388 } 389 390 return 2 * *prate * m; 391 } 392 393 static int lpc18xx_pll0_set_rate(struct clk_hw *hw, unsigned long rate, 394 unsigned long parent_rate) 395 { 396 struct lpc18xx_pll *pll = to_lpc_pll(hw); 397 u32 ctrl, stat, m; 398 int retry = 3; 399 400 if (parent_rate < rate) { 401 pr_warn("%s: pll dividers not supported\n", __func__); 402 return -EINVAL; 403 } 404 405 m = DIV_ROUND_UP_ULL(parent_rate, rate * 2); 406 if (m <= 0 && m > LPC18XX_PLL0_MSEL_MAX) { 407 pr_warn("%s: unable to support rate %lu\n", __func__, rate); 408 return -EINVAL; 409 } 410 411 m = lpc18xx_pll0_msel2mdec(m); 412 m |= lpc18xx_pll0_msel2selp(m) << LPC18XX_PLL0_MDIV_SELP_SHIFT; 413 m |= lpc18xx_pll0_msel2seli(m) << LPC18XX_PLL0_MDIV_SELI_SHIFT; 414 415 /* Power down PLL, disable clk output and dividers */ 416 ctrl = readl(pll->reg + LPC18XX_CGU_PLL0USB_CTRL); 417 ctrl |= LPC18XX_PLL0_CTRL_PD; 418 ctrl &= ~(LPC18XX_PLL0_CTRL_BYPASS | LPC18XX_PLL0_CTRL_DIRECTI | 419 LPC18XX_PLL0_CTRL_DIRECTO | LPC18XX_PLL0_CTRL_CLKEN); 420 writel(ctrl, pll->reg + LPC18XX_CGU_PLL0USB_CTRL); 421 422 /* Configure new PLL settings */ 423 writel(m, pll->reg + LPC18XX_CGU_PLL0USB_MDIV); 424 writel(LPC18XX_PLL0_NP_DIVS_1, pll->reg + LPC18XX_CGU_PLL0USB_NP_DIV); 425 426 /* Power up PLL and wait for lock */ 427 ctrl &= ~LPC18XX_PLL0_CTRL_PD; 428 writel(ctrl, pll->reg + LPC18XX_CGU_PLL0USB_CTRL); 429 do { 430 udelay(10); 431 stat = readl(pll->reg + LPC18XX_CGU_PLL0USB_STAT); 432 if (stat & LPC18XX_PLL0_STAT_LOCK) { 433 ctrl |= LPC18XX_PLL0_CTRL_CLKEN; 434 writel(ctrl, pll->reg + LPC18XX_CGU_PLL0USB_CTRL); 435 436 return 0; 437 } 438 } while (retry--); 439 440 pr_warn("%s: unable to lock pll\n", __func__); 441 442 return -EINVAL; 443 } 444 445 static const struct clk_ops lpc18xx_pll0_ops = { 446 .recalc_rate = lpc18xx_pll0_recalc_rate, 447 .round_rate = lpc18xx_pll0_round_rate, 448 .set_rate = lpc18xx_pll0_set_rate, 449 }; 450 451 static unsigned long lpc18xx_pll1_recalc_rate(struct clk_hw *hw, 452 unsigned long parent_rate) 453 { 454 struct lpc18xx_pll *pll = to_lpc_pll(hw); 455 u16 msel, nsel, psel; 456 bool direct, fbsel; 457 u32 ctrl; 458 459 ctrl = readl(pll->reg + LPC18XX_CGU_PLL1_CTRL); 460 461 direct = (ctrl & LPC18XX_PLL1_CTRL_DIRECT) ? true : false; 462 fbsel = (ctrl & LPC18XX_PLL1_CTRL_FBSEL) ? true : false; 463 464 msel = ((ctrl >> 16) & 0xff) + 1; 465 nsel = ((ctrl >> 12) & 0x3) + 1; 466 467 if (direct || fbsel) 468 return msel * (parent_rate / nsel); 469 470 psel = (ctrl >> 8) & 0x3; 471 psel = 1 << psel; 472 473 return (msel / (2 * psel)) * (parent_rate / nsel); 474 } 475 476 static const struct clk_ops lpc18xx_pll1_ops = { 477 .recalc_rate = lpc18xx_pll1_recalc_rate, 478 }; 479 480 static int lpc18xx_cgu_gate_enable(struct clk_hw *hw) 481 { 482 return clk_gate_ops.enable(hw); 483 } 484 485 static void lpc18xx_cgu_gate_disable(struct clk_hw *hw) 486 { 487 clk_gate_ops.disable(hw); 488 } 489 490 static int lpc18xx_cgu_gate_is_enabled(struct clk_hw *hw) 491 { 492 const struct clk_hw *parent; 493 494 /* 495 * The consumer of base clocks needs know if the 496 * base clock is really enabled before it can be 497 * accessed. It is therefore necessary to verify 498 * this all the way up. 499 */ 500 parent = clk_hw_get_parent(hw); 501 if (!parent) 502 return 0; 503 504 if (!clk_hw_is_enabled(parent)) 505 return 0; 506 507 return clk_gate_ops.is_enabled(hw); 508 } 509 510 static const struct clk_ops lpc18xx_gate_ops = { 511 .enable = lpc18xx_cgu_gate_enable, 512 .disable = lpc18xx_cgu_gate_disable, 513 .is_enabled = lpc18xx_cgu_gate_is_enabled, 514 }; 515 516 static struct lpc18xx_cgu_pll_clk lpc18xx_cgu_src_clk_plls[] = { 517 LPC1XX_CGU_CLK_PLL(PLL0USB, pll0_src_ids, pll0_ops), 518 LPC1XX_CGU_CLK_PLL(PLL0AUDIO, pll0_src_ids, pll0_ops), 519 LPC1XX_CGU_CLK_PLL(PLL1, pll1_src_ids, pll1_ops), 520 }; 521 522 static void lpc18xx_fill_parent_names(const char **parent, const u32 *id, int size) 523 { 524 int i; 525 526 for (i = 0; i < size; i++) 527 parent[i] = clk_src_names[id[i]]; 528 } 529 530 static struct clk *lpc18xx_cgu_register_div(struct lpc18xx_cgu_src_clk_div *clk, 531 void __iomem *base, int n) 532 { 533 void __iomem *reg = base + LPC18XX_CGU_IDIV_CTRL(n); 534 const char *name = clk_src_names[clk->clk_id]; 535 const char *parents[CLK_SRC_MAX]; 536 537 clk->div.reg = reg; 538 clk->mux.reg = reg; 539 clk->gate.reg = reg; 540 541 lpc18xx_fill_parent_names(parents, clk->mux.table, clk->n_parents); 542 543 return clk_register_composite(NULL, name, parents, clk->n_parents, 544 &clk->mux.hw, &clk_mux_ops, 545 &clk->div.hw, &clk_divider_ops, 546 &clk->gate.hw, &lpc18xx_gate_ops, 0); 547 } 548 549 550 static struct clk *lpc18xx_register_base_clk(struct lpc18xx_cgu_base_clk *clk, 551 void __iomem *reg_base, int n) 552 { 553 void __iomem *reg = reg_base + LPC18XX_CGU_BASE_CLK(n); 554 const char *name = clk_base_names[clk->clk_id]; 555 const char *parents[CLK_SRC_MAX]; 556 557 if (clk->n_parents == 0) 558 return ERR_PTR(-ENOENT); 559 560 clk->mux.reg = reg; 561 clk->gate.reg = reg; 562 563 lpc18xx_fill_parent_names(parents, clk->mux.table, clk->n_parents); 564 565 /* SAFE_CLK can not be turned off */ 566 if (n == BASE_SAFE_CLK) 567 return clk_register_composite(NULL, name, parents, clk->n_parents, 568 &clk->mux.hw, &clk_mux_ops, 569 NULL, NULL, NULL, NULL, 0); 570 571 return clk_register_composite(NULL, name, parents, clk->n_parents, 572 &clk->mux.hw, &clk_mux_ops, 573 NULL, NULL, 574 &clk->gate.hw, &lpc18xx_gate_ops, 0); 575 } 576 577 578 static struct clk *lpc18xx_cgu_register_pll(struct lpc18xx_cgu_pll_clk *clk, 579 void __iomem *base) 580 { 581 const char *name = clk_src_names[clk->clk_id]; 582 const char *parents[CLK_SRC_MAX]; 583 584 clk->pll.reg = base; 585 clk->mux.reg = base + clk->reg_offset + LPC18XX_CGU_PLL_CTRL_OFFSET; 586 clk->gate.reg = base + clk->reg_offset + LPC18XX_CGU_PLL_CTRL_OFFSET; 587 588 lpc18xx_fill_parent_names(parents, clk->mux.table, clk->n_parents); 589 590 return clk_register_composite(NULL, name, parents, clk->n_parents, 591 &clk->mux.hw, &clk_mux_ops, 592 &clk->pll.hw, clk->pll_ops, 593 &clk->gate.hw, &lpc18xx_gate_ops, 0); 594 } 595 596 static void __init lpc18xx_cgu_register_source_clks(struct device_node *np, 597 void __iomem *base) 598 { 599 const char *parents[CLK_SRC_MAX]; 600 struct clk *clk; 601 int i; 602 603 /* Register the internal 12 MHz RC oscillator (IRC) */ 604 clk = clk_register_fixed_rate(NULL, clk_src_names[CLK_SRC_IRC], 605 NULL, 0, 12000000); 606 if (IS_ERR(clk)) 607 pr_warn("%s: failed to register irc clk\n", __func__); 608 609 /* Register crystal oscillator controlller */ 610 parents[0] = of_clk_get_parent_name(np, 0); 611 clk = clk_register_gate(NULL, clk_src_names[CLK_SRC_OSC], parents[0], 612 0, base + LPC18XX_CGU_XTAL_OSC_CTRL, 613 0, CLK_GATE_SET_TO_DISABLE, NULL); 614 if (IS_ERR(clk)) 615 pr_warn("%s: failed to register osc clk\n", __func__); 616 617 /* Register all PLLs */ 618 for (i = 0; i < ARRAY_SIZE(lpc18xx_cgu_src_clk_plls); i++) { 619 clk = lpc18xx_cgu_register_pll(&lpc18xx_cgu_src_clk_plls[i], 620 base); 621 if (IS_ERR(clk)) 622 pr_warn("%s: failed to register pll (%d)\n", __func__, i); 623 } 624 625 /* Register all clock dividers A-E */ 626 for (i = 0; i < ARRAY_SIZE(lpc18xx_cgu_src_clk_divs); i++) { 627 clk = lpc18xx_cgu_register_div(&lpc18xx_cgu_src_clk_divs[i], 628 base, i); 629 if (IS_ERR(clk)) 630 pr_warn("%s: failed to register div %d\n", __func__, i); 631 } 632 } 633 634 static struct clk *clk_base[BASE_CLK_MAX]; 635 static struct clk_onecell_data clk_base_data = { 636 .clks = clk_base, 637 .clk_num = BASE_CLK_MAX, 638 }; 639 640 static void __init lpc18xx_cgu_register_base_clks(void __iomem *reg_base) 641 { 642 int i; 643 644 for (i = BASE_SAFE_CLK; i < BASE_CLK_MAX; i++) { 645 clk_base[i] = lpc18xx_register_base_clk(&lpc18xx_cgu_base_clks[i], 646 reg_base, i); 647 if (IS_ERR(clk_base[i]) && PTR_ERR(clk_base[i]) != -ENOENT) 648 pr_warn("%s: register base clk %d failed\n", __func__, i); 649 } 650 } 651 652 static void __init lpc18xx_cgu_init(struct device_node *np) 653 { 654 void __iomem *reg_base; 655 656 reg_base = of_iomap(np, 0); 657 if (!reg_base) { 658 pr_warn("%s: failed to map address range\n", __func__); 659 return; 660 } 661 662 lpc18xx_cgu_register_source_clks(np, reg_base); 663 lpc18xx_cgu_register_base_clks(reg_base); 664 665 of_clk_add_provider(np, of_clk_src_onecell_get, &clk_base_data); 666 } 667 CLK_OF_DECLARE(lpc18xx_cgu, "nxp,lpc1850-cgu", lpc18xx_cgu_init); 668