1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Atheros AR71XX/AR724X/AR913X common routines 4 * 5 * Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com> 6 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org> 7 * 8 * Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/init.h> 13 #include <linux/io.h> 14 #include <linux/err.h> 15 #include <linux/clk.h> 16 #include <linux/clkdev.h> 17 #include <linux/clk-provider.h> 18 #include <linux/of.h> 19 #include <linux/of_address.h> 20 #include <dt-bindings/clock/ath79-clk.h> 21 22 #include <asm/div64.h> 23 24 #include <asm/mach-ath79/ath79.h> 25 #include <asm/mach-ath79/ar71xx_regs.h> 26 #include "common.h" 27 28 #define AR71XX_BASE_FREQ 40000000 29 #define AR724X_BASE_FREQ 40000000 30 31 static struct clk *clks[ATH79_CLK_END]; 32 static struct clk_onecell_data clk_data = { 33 .clks = clks, 34 .clk_num = ARRAY_SIZE(clks), 35 }; 36 37 static const char * const clk_names[ATH79_CLK_END] = { 38 [ATH79_CLK_CPU] = "cpu", 39 [ATH79_CLK_DDR] = "ddr", 40 [ATH79_CLK_AHB] = "ahb", 41 [ATH79_CLK_REF] = "ref", 42 [ATH79_CLK_MDIO] = "mdio", 43 }; 44 ath79_clk_name(int type)45 static const char * __init ath79_clk_name(int type) 46 { 47 BUG_ON(type >= ARRAY_SIZE(clk_names) || !clk_names[type]); 48 return clk_names[type]; 49 } 50 __ath79_set_clk(int type,const char * name,struct clk * clk)51 static void __init __ath79_set_clk(int type, const char *name, struct clk *clk) 52 { 53 if (IS_ERR(clk)) 54 panic("failed to allocate %s clock structure", clk_names[type]); 55 56 clks[type] = clk; 57 clk_register_clkdev(clk, name, NULL); 58 } 59 ath79_set_clk(int type,unsigned long rate)60 static struct clk * __init ath79_set_clk(int type, unsigned long rate) 61 { 62 const char *name = ath79_clk_name(type); 63 struct clk *clk; 64 65 clk = clk_register_fixed_rate(NULL, name, NULL, 0, rate); 66 __ath79_set_clk(type, name, clk); 67 return clk; 68 } 69 ath79_set_ff_clk(int type,const char * parent,unsigned int mult,unsigned int div)70 static struct clk * __init ath79_set_ff_clk(int type, const char *parent, 71 unsigned int mult, unsigned int div) 72 { 73 const char *name = ath79_clk_name(type); 74 struct clk *clk; 75 76 clk = clk_register_fixed_factor(NULL, name, parent, 0, mult, div); 77 __ath79_set_clk(type, name, clk); 78 return clk; 79 } 80 ath79_setup_ref_clk(unsigned long rate)81 static unsigned long __init ath79_setup_ref_clk(unsigned long rate) 82 { 83 struct clk *clk = clks[ATH79_CLK_REF]; 84 85 if (clk) 86 rate = clk_get_rate(clk); 87 else 88 clk = ath79_set_clk(ATH79_CLK_REF, rate); 89 90 return rate; 91 } 92 ar71xx_clocks_init(void __iomem * pll_base)93 static void __init ar71xx_clocks_init(void __iomem *pll_base) 94 { 95 unsigned long ref_rate; 96 unsigned long cpu_rate; 97 unsigned long ddr_rate; 98 unsigned long ahb_rate; 99 u32 pll; 100 u32 freq; 101 u32 div; 102 103 ref_rate = ath79_setup_ref_clk(AR71XX_BASE_FREQ); 104 105 pll = __raw_readl(pll_base + AR71XX_PLL_REG_CPU_CONFIG); 106 107 div = ((pll >> AR71XX_PLL_FB_SHIFT) & AR71XX_PLL_FB_MASK) + 1; 108 freq = div * ref_rate; 109 110 div = ((pll >> AR71XX_CPU_DIV_SHIFT) & AR71XX_CPU_DIV_MASK) + 1; 111 cpu_rate = freq / div; 112 113 div = ((pll >> AR71XX_DDR_DIV_SHIFT) & AR71XX_DDR_DIV_MASK) + 1; 114 ddr_rate = freq / div; 115 116 div = (((pll >> AR71XX_AHB_DIV_SHIFT) & AR71XX_AHB_DIV_MASK) + 1) * 2; 117 ahb_rate = cpu_rate / div; 118 119 ath79_set_clk(ATH79_CLK_CPU, cpu_rate); 120 ath79_set_clk(ATH79_CLK_DDR, ddr_rate); 121 ath79_set_clk(ATH79_CLK_AHB, ahb_rate); 122 } 123 ar724x_clocks_init(void __iomem * pll_base)124 static void __init ar724x_clocks_init(void __iomem *pll_base) 125 { 126 u32 mult, div, ddr_div, ahb_div; 127 u32 pll; 128 129 ath79_setup_ref_clk(AR71XX_BASE_FREQ); 130 131 pll = __raw_readl(pll_base + AR724X_PLL_REG_CPU_CONFIG); 132 133 mult = ((pll >> AR724X_PLL_FB_SHIFT) & AR724X_PLL_FB_MASK); 134 div = ((pll >> AR724X_PLL_REF_DIV_SHIFT) & AR724X_PLL_REF_DIV_MASK) * 2; 135 136 ddr_div = ((pll >> AR724X_DDR_DIV_SHIFT) & AR724X_DDR_DIV_MASK) + 1; 137 ahb_div = (((pll >> AR724X_AHB_DIV_SHIFT) & AR724X_AHB_DIV_MASK) + 1) * 2; 138 139 ath79_set_ff_clk(ATH79_CLK_CPU, "ref", mult, div); 140 ath79_set_ff_clk(ATH79_CLK_DDR, "ref", mult, div * ddr_div); 141 ath79_set_ff_clk(ATH79_CLK_AHB, "ref", mult, div * ahb_div); 142 } 143 ar933x_clocks_init(void __iomem * pll_base)144 static void __init ar933x_clocks_init(void __iomem *pll_base) 145 { 146 unsigned long ref_rate; 147 u32 clock_ctrl; 148 u32 ref_div; 149 u32 ninit_mul; 150 u32 out_div; 151 152 u32 cpu_div; 153 u32 ddr_div; 154 u32 ahb_div; 155 u32 t; 156 157 t = ath79_reset_rr(AR933X_RESET_REG_BOOTSTRAP); 158 if (t & AR933X_BOOTSTRAP_REF_CLK_40) 159 ref_rate = (40 * 1000 * 1000); 160 else 161 ref_rate = (25 * 1000 * 1000); 162 163 ath79_setup_ref_clk(ref_rate); 164 165 clock_ctrl = __raw_readl(pll_base + AR933X_PLL_CLOCK_CTRL_REG); 166 if (clock_ctrl & AR933X_PLL_CLOCK_CTRL_BYPASS) { 167 ref_div = 1; 168 ninit_mul = 1; 169 out_div = 1; 170 171 cpu_div = 1; 172 ddr_div = 1; 173 ahb_div = 1; 174 } else { 175 u32 cpu_config; 176 u32 t; 177 178 cpu_config = __raw_readl(pll_base + AR933X_PLL_CPU_CONFIG_REG); 179 180 t = (cpu_config >> AR933X_PLL_CPU_CONFIG_REFDIV_SHIFT) & 181 AR933X_PLL_CPU_CONFIG_REFDIV_MASK; 182 ref_div = t; 183 184 ninit_mul = (cpu_config >> AR933X_PLL_CPU_CONFIG_NINT_SHIFT) & 185 AR933X_PLL_CPU_CONFIG_NINT_MASK; 186 187 t = (cpu_config >> AR933X_PLL_CPU_CONFIG_OUTDIV_SHIFT) & 188 AR933X_PLL_CPU_CONFIG_OUTDIV_MASK; 189 if (t == 0) 190 t = 1; 191 192 out_div = (1 << t); 193 194 cpu_div = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_CPU_DIV_SHIFT) & 195 AR933X_PLL_CLOCK_CTRL_CPU_DIV_MASK) + 1; 196 197 ddr_div = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_DDR_DIV_SHIFT) & 198 AR933X_PLL_CLOCK_CTRL_DDR_DIV_MASK) + 1; 199 200 ahb_div = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_AHB_DIV_SHIFT) & 201 AR933X_PLL_CLOCK_CTRL_AHB_DIV_MASK) + 1; 202 } 203 204 ath79_set_ff_clk(ATH79_CLK_CPU, "ref", ninit_mul, 205 ref_div * out_div * cpu_div); 206 ath79_set_ff_clk(ATH79_CLK_DDR, "ref", ninit_mul, 207 ref_div * out_div * ddr_div); 208 ath79_set_ff_clk(ATH79_CLK_AHB, "ref", ninit_mul, 209 ref_div * out_div * ahb_div); 210 } 211 ar934x_get_pll_freq(u32 ref,u32 ref_div,u32 nint,u32 nfrac,u32 frac,u32 out_div)212 static u32 __init ar934x_get_pll_freq(u32 ref, u32 ref_div, u32 nint, u32 nfrac, 213 u32 frac, u32 out_div) 214 { 215 u64 t; 216 u32 ret; 217 218 t = ref; 219 t *= nint; 220 do_div(t, ref_div); 221 ret = t; 222 223 t = ref; 224 t *= nfrac; 225 do_div(t, ref_div * frac); 226 ret += t; 227 228 ret /= (1 << out_div); 229 return ret; 230 } 231 ar934x_clocks_init(void __iomem * pll_base)232 static void __init ar934x_clocks_init(void __iomem *pll_base) 233 { 234 unsigned long ref_rate; 235 unsigned long cpu_rate; 236 unsigned long ddr_rate; 237 unsigned long ahb_rate; 238 u32 pll, out_div, ref_div, nint, nfrac, frac, clk_ctrl, postdiv; 239 u32 cpu_pll, ddr_pll; 240 u32 bootstrap; 241 void __iomem *dpll_base; 242 243 dpll_base = ioremap(AR934X_SRIF_BASE, AR934X_SRIF_SIZE); 244 245 bootstrap = ath79_reset_rr(AR934X_RESET_REG_BOOTSTRAP); 246 if (bootstrap & AR934X_BOOTSTRAP_REF_CLK_40) 247 ref_rate = 40 * 1000 * 1000; 248 else 249 ref_rate = 25 * 1000 * 1000; 250 251 ref_rate = ath79_setup_ref_clk(ref_rate); 252 253 pll = __raw_readl(dpll_base + AR934X_SRIF_CPU_DPLL2_REG); 254 if (pll & AR934X_SRIF_DPLL2_LOCAL_PLL) { 255 out_div = (pll >> AR934X_SRIF_DPLL2_OUTDIV_SHIFT) & 256 AR934X_SRIF_DPLL2_OUTDIV_MASK; 257 pll = __raw_readl(dpll_base + AR934X_SRIF_CPU_DPLL1_REG); 258 nint = (pll >> AR934X_SRIF_DPLL1_NINT_SHIFT) & 259 AR934X_SRIF_DPLL1_NINT_MASK; 260 nfrac = pll & AR934X_SRIF_DPLL1_NFRAC_MASK; 261 ref_div = (pll >> AR934X_SRIF_DPLL1_REFDIV_SHIFT) & 262 AR934X_SRIF_DPLL1_REFDIV_MASK; 263 frac = 1 << 18; 264 } else { 265 pll = __raw_readl(pll_base + AR934X_PLL_CPU_CONFIG_REG); 266 out_div = (pll >> AR934X_PLL_CPU_CONFIG_OUTDIV_SHIFT) & 267 AR934X_PLL_CPU_CONFIG_OUTDIV_MASK; 268 ref_div = (pll >> AR934X_PLL_CPU_CONFIG_REFDIV_SHIFT) & 269 AR934X_PLL_CPU_CONFIG_REFDIV_MASK; 270 nint = (pll >> AR934X_PLL_CPU_CONFIG_NINT_SHIFT) & 271 AR934X_PLL_CPU_CONFIG_NINT_MASK; 272 nfrac = (pll >> AR934X_PLL_CPU_CONFIG_NFRAC_SHIFT) & 273 AR934X_PLL_CPU_CONFIG_NFRAC_MASK; 274 frac = 1 << 6; 275 } 276 277 cpu_pll = ar934x_get_pll_freq(ref_rate, ref_div, nint, 278 nfrac, frac, out_div); 279 280 pll = __raw_readl(dpll_base + AR934X_SRIF_DDR_DPLL2_REG); 281 if (pll & AR934X_SRIF_DPLL2_LOCAL_PLL) { 282 out_div = (pll >> AR934X_SRIF_DPLL2_OUTDIV_SHIFT) & 283 AR934X_SRIF_DPLL2_OUTDIV_MASK; 284 pll = __raw_readl(dpll_base + AR934X_SRIF_DDR_DPLL1_REG); 285 nint = (pll >> AR934X_SRIF_DPLL1_NINT_SHIFT) & 286 AR934X_SRIF_DPLL1_NINT_MASK; 287 nfrac = pll & AR934X_SRIF_DPLL1_NFRAC_MASK; 288 ref_div = (pll >> AR934X_SRIF_DPLL1_REFDIV_SHIFT) & 289 AR934X_SRIF_DPLL1_REFDIV_MASK; 290 frac = 1 << 18; 291 } else { 292 pll = __raw_readl(pll_base + AR934X_PLL_DDR_CONFIG_REG); 293 out_div = (pll >> AR934X_PLL_DDR_CONFIG_OUTDIV_SHIFT) & 294 AR934X_PLL_DDR_CONFIG_OUTDIV_MASK; 295 ref_div = (pll >> AR934X_PLL_DDR_CONFIG_REFDIV_SHIFT) & 296 AR934X_PLL_DDR_CONFIG_REFDIV_MASK; 297 nint = (pll >> AR934X_PLL_DDR_CONFIG_NINT_SHIFT) & 298 AR934X_PLL_DDR_CONFIG_NINT_MASK; 299 nfrac = (pll >> AR934X_PLL_DDR_CONFIG_NFRAC_SHIFT) & 300 AR934X_PLL_DDR_CONFIG_NFRAC_MASK; 301 frac = 1 << 10; 302 } 303 304 ddr_pll = ar934x_get_pll_freq(ref_rate, ref_div, nint, 305 nfrac, frac, out_div); 306 307 clk_ctrl = __raw_readl(pll_base + AR934X_PLL_CPU_DDR_CLK_CTRL_REG); 308 309 postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_POST_DIV_SHIFT) & 310 AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_POST_DIV_MASK; 311 312 if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_PLL_BYPASS) 313 cpu_rate = ref_rate; 314 else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_CPUCLK_FROM_CPUPLL) 315 cpu_rate = cpu_pll / (postdiv + 1); 316 else 317 cpu_rate = ddr_pll / (postdiv + 1); 318 319 postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_POST_DIV_SHIFT) & 320 AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_POST_DIV_MASK; 321 322 if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_PLL_BYPASS) 323 ddr_rate = ref_rate; 324 else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_DDRCLK_FROM_DDRPLL) 325 ddr_rate = ddr_pll / (postdiv + 1); 326 else 327 ddr_rate = cpu_pll / (postdiv + 1); 328 329 postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_POST_DIV_SHIFT) & 330 AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_POST_DIV_MASK; 331 332 if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_PLL_BYPASS) 333 ahb_rate = ref_rate; 334 else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_AHBCLK_FROM_DDRPLL) 335 ahb_rate = ddr_pll / (postdiv + 1); 336 else 337 ahb_rate = cpu_pll / (postdiv + 1); 338 339 ath79_set_clk(ATH79_CLK_CPU, cpu_rate); 340 ath79_set_clk(ATH79_CLK_DDR, ddr_rate); 341 ath79_set_clk(ATH79_CLK_AHB, ahb_rate); 342 343 clk_ctrl = __raw_readl(pll_base + AR934X_PLL_SWITCH_CLOCK_CONTROL_REG); 344 if (clk_ctrl & AR934X_PLL_SWITCH_CLOCK_CONTROL_MDIO_CLK_SEL) 345 ath79_set_clk(ATH79_CLK_MDIO, 100 * 1000 * 1000); 346 347 iounmap(dpll_base); 348 } 349 qca953x_clocks_init(void __iomem * pll_base)350 static void __init qca953x_clocks_init(void __iomem *pll_base) 351 { 352 unsigned long ref_rate; 353 unsigned long cpu_rate; 354 unsigned long ddr_rate; 355 unsigned long ahb_rate; 356 u32 pll, out_div, ref_div, nint, frac, clk_ctrl, postdiv; 357 u32 cpu_pll, ddr_pll; 358 u32 bootstrap; 359 360 bootstrap = ath79_reset_rr(QCA953X_RESET_REG_BOOTSTRAP); 361 if (bootstrap & QCA953X_BOOTSTRAP_REF_CLK_40) 362 ref_rate = 40 * 1000 * 1000; 363 else 364 ref_rate = 25 * 1000 * 1000; 365 366 ref_rate = ath79_setup_ref_clk(ref_rate); 367 368 pll = __raw_readl(pll_base + QCA953X_PLL_CPU_CONFIG_REG); 369 out_div = (pll >> QCA953X_PLL_CPU_CONFIG_OUTDIV_SHIFT) & 370 QCA953X_PLL_CPU_CONFIG_OUTDIV_MASK; 371 ref_div = (pll >> QCA953X_PLL_CPU_CONFIG_REFDIV_SHIFT) & 372 QCA953X_PLL_CPU_CONFIG_REFDIV_MASK; 373 nint = (pll >> QCA953X_PLL_CPU_CONFIG_NINT_SHIFT) & 374 QCA953X_PLL_CPU_CONFIG_NINT_MASK; 375 frac = (pll >> QCA953X_PLL_CPU_CONFIG_NFRAC_SHIFT) & 376 QCA953X_PLL_CPU_CONFIG_NFRAC_MASK; 377 378 cpu_pll = nint * ref_rate / ref_div; 379 cpu_pll += frac * (ref_rate >> 6) / ref_div; 380 cpu_pll /= (1 << out_div); 381 382 pll = __raw_readl(pll_base + QCA953X_PLL_DDR_CONFIG_REG); 383 out_div = (pll >> QCA953X_PLL_DDR_CONFIG_OUTDIV_SHIFT) & 384 QCA953X_PLL_DDR_CONFIG_OUTDIV_MASK; 385 ref_div = (pll >> QCA953X_PLL_DDR_CONFIG_REFDIV_SHIFT) & 386 QCA953X_PLL_DDR_CONFIG_REFDIV_MASK; 387 nint = (pll >> QCA953X_PLL_DDR_CONFIG_NINT_SHIFT) & 388 QCA953X_PLL_DDR_CONFIG_NINT_MASK; 389 frac = (pll >> QCA953X_PLL_DDR_CONFIG_NFRAC_SHIFT) & 390 QCA953X_PLL_DDR_CONFIG_NFRAC_MASK; 391 392 ddr_pll = nint * ref_rate / ref_div; 393 ddr_pll += frac * (ref_rate >> 6) / (ref_div << 4); 394 ddr_pll /= (1 << out_div); 395 396 clk_ctrl = __raw_readl(pll_base + QCA953X_PLL_CLK_CTRL_REG); 397 398 postdiv = (clk_ctrl >> QCA953X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT) & 399 QCA953X_PLL_CLK_CTRL_CPU_POST_DIV_MASK; 400 401 if (clk_ctrl & QCA953X_PLL_CLK_CTRL_CPU_PLL_BYPASS) 402 cpu_rate = ref_rate; 403 else if (clk_ctrl & QCA953X_PLL_CLK_CTRL_CPUCLK_FROM_CPUPLL) 404 cpu_rate = cpu_pll / (postdiv + 1); 405 else 406 cpu_rate = ddr_pll / (postdiv + 1); 407 408 postdiv = (clk_ctrl >> QCA953X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT) & 409 QCA953X_PLL_CLK_CTRL_DDR_POST_DIV_MASK; 410 411 if (clk_ctrl & QCA953X_PLL_CLK_CTRL_DDR_PLL_BYPASS) 412 ddr_rate = ref_rate; 413 else if (clk_ctrl & QCA953X_PLL_CLK_CTRL_DDRCLK_FROM_DDRPLL) 414 ddr_rate = ddr_pll / (postdiv + 1); 415 else 416 ddr_rate = cpu_pll / (postdiv + 1); 417 418 postdiv = (clk_ctrl >> QCA953X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT) & 419 QCA953X_PLL_CLK_CTRL_AHB_POST_DIV_MASK; 420 421 if (clk_ctrl & QCA953X_PLL_CLK_CTRL_AHB_PLL_BYPASS) 422 ahb_rate = ref_rate; 423 else if (clk_ctrl & QCA953X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL) 424 ahb_rate = ddr_pll / (postdiv + 1); 425 else 426 ahb_rate = cpu_pll / (postdiv + 1); 427 428 ath79_set_clk(ATH79_CLK_CPU, cpu_rate); 429 ath79_set_clk(ATH79_CLK_DDR, ddr_rate); 430 ath79_set_clk(ATH79_CLK_AHB, ahb_rate); 431 } 432 qca955x_clocks_init(void __iomem * pll_base)433 static void __init qca955x_clocks_init(void __iomem *pll_base) 434 { 435 unsigned long ref_rate; 436 unsigned long cpu_rate; 437 unsigned long ddr_rate; 438 unsigned long ahb_rate; 439 u32 pll, out_div, ref_div, nint, frac, clk_ctrl, postdiv; 440 u32 cpu_pll, ddr_pll; 441 u32 bootstrap; 442 443 bootstrap = ath79_reset_rr(QCA955X_RESET_REG_BOOTSTRAP); 444 if (bootstrap & QCA955X_BOOTSTRAP_REF_CLK_40) 445 ref_rate = 40 * 1000 * 1000; 446 else 447 ref_rate = 25 * 1000 * 1000; 448 449 ref_rate = ath79_setup_ref_clk(ref_rate); 450 451 pll = __raw_readl(pll_base + QCA955X_PLL_CPU_CONFIG_REG); 452 out_div = (pll >> QCA955X_PLL_CPU_CONFIG_OUTDIV_SHIFT) & 453 QCA955X_PLL_CPU_CONFIG_OUTDIV_MASK; 454 ref_div = (pll >> QCA955X_PLL_CPU_CONFIG_REFDIV_SHIFT) & 455 QCA955X_PLL_CPU_CONFIG_REFDIV_MASK; 456 nint = (pll >> QCA955X_PLL_CPU_CONFIG_NINT_SHIFT) & 457 QCA955X_PLL_CPU_CONFIG_NINT_MASK; 458 frac = (pll >> QCA955X_PLL_CPU_CONFIG_NFRAC_SHIFT) & 459 QCA955X_PLL_CPU_CONFIG_NFRAC_MASK; 460 461 cpu_pll = nint * ref_rate / ref_div; 462 cpu_pll += frac * ref_rate / (ref_div * (1 << 6)); 463 cpu_pll /= (1 << out_div); 464 465 pll = __raw_readl(pll_base + QCA955X_PLL_DDR_CONFIG_REG); 466 out_div = (pll >> QCA955X_PLL_DDR_CONFIG_OUTDIV_SHIFT) & 467 QCA955X_PLL_DDR_CONFIG_OUTDIV_MASK; 468 ref_div = (pll >> QCA955X_PLL_DDR_CONFIG_REFDIV_SHIFT) & 469 QCA955X_PLL_DDR_CONFIG_REFDIV_MASK; 470 nint = (pll >> QCA955X_PLL_DDR_CONFIG_NINT_SHIFT) & 471 QCA955X_PLL_DDR_CONFIG_NINT_MASK; 472 frac = (pll >> QCA955X_PLL_DDR_CONFIG_NFRAC_SHIFT) & 473 QCA955X_PLL_DDR_CONFIG_NFRAC_MASK; 474 475 ddr_pll = nint * ref_rate / ref_div; 476 ddr_pll += frac * ref_rate / (ref_div * (1 << 10)); 477 ddr_pll /= (1 << out_div); 478 479 clk_ctrl = __raw_readl(pll_base + QCA955X_PLL_CLK_CTRL_REG); 480 481 postdiv = (clk_ctrl >> QCA955X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT) & 482 QCA955X_PLL_CLK_CTRL_CPU_POST_DIV_MASK; 483 484 if (clk_ctrl & QCA955X_PLL_CLK_CTRL_CPU_PLL_BYPASS) 485 cpu_rate = ref_rate; 486 else if (clk_ctrl & QCA955X_PLL_CLK_CTRL_CPUCLK_FROM_CPUPLL) 487 cpu_rate = ddr_pll / (postdiv + 1); 488 else 489 cpu_rate = cpu_pll / (postdiv + 1); 490 491 postdiv = (clk_ctrl >> QCA955X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT) & 492 QCA955X_PLL_CLK_CTRL_DDR_POST_DIV_MASK; 493 494 if (clk_ctrl & QCA955X_PLL_CLK_CTRL_DDR_PLL_BYPASS) 495 ddr_rate = ref_rate; 496 else if (clk_ctrl & QCA955X_PLL_CLK_CTRL_DDRCLK_FROM_DDRPLL) 497 ddr_rate = cpu_pll / (postdiv + 1); 498 else 499 ddr_rate = ddr_pll / (postdiv + 1); 500 501 postdiv = (clk_ctrl >> QCA955X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT) & 502 QCA955X_PLL_CLK_CTRL_AHB_POST_DIV_MASK; 503 504 if (clk_ctrl & QCA955X_PLL_CLK_CTRL_AHB_PLL_BYPASS) 505 ahb_rate = ref_rate; 506 else if (clk_ctrl & QCA955X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL) 507 ahb_rate = ddr_pll / (postdiv + 1); 508 else 509 ahb_rate = cpu_pll / (postdiv + 1); 510 511 ath79_set_clk(ATH79_CLK_CPU, cpu_rate); 512 ath79_set_clk(ATH79_CLK_DDR, ddr_rate); 513 ath79_set_clk(ATH79_CLK_AHB, ahb_rate); 514 } 515 qca956x_clocks_init(void __iomem * pll_base)516 static void __init qca956x_clocks_init(void __iomem *pll_base) 517 { 518 unsigned long ref_rate; 519 unsigned long cpu_rate; 520 unsigned long ddr_rate; 521 unsigned long ahb_rate; 522 u32 pll, out_div, ref_div, nint, hfrac, lfrac, clk_ctrl, postdiv; 523 u32 cpu_pll, ddr_pll; 524 u32 bootstrap; 525 526 /* 527 * QCA956x timer init workaround has to be applied right before setting 528 * up the clock. Else, there will be no jiffies 529 */ 530 u32 misc; 531 532 misc = ath79_reset_rr(AR71XX_RESET_REG_MISC_INT_ENABLE); 533 misc |= MISC_INT_MIPS_SI_TIMERINT_MASK; 534 ath79_reset_wr(AR71XX_RESET_REG_MISC_INT_ENABLE, misc); 535 536 bootstrap = ath79_reset_rr(QCA956X_RESET_REG_BOOTSTRAP); 537 if (bootstrap & QCA956X_BOOTSTRAP_REF_CLK_40) 538 ref_rate = 40 * 1000 * 1000; 539 else 540 ref_rate = 25 * 1000 * 1000; 541 542 ref_rate = ath79_setup_ref_clk(ref_rate); 543 544 pll = __raw_readl(pll_base + QCA956X_PLL_CPU_CONFIG_REG); 545 out_div = (pll >> QCA956X_PLL_CPU_CONFIG_OUTDIV_SHIFT) & 546 QCA956X_PLL_CPU_CONFIG_OUTDIV_MASK; 547 ref_div = (pll >> QCA956X_PLL_CPU_CONFIG_REFDIV_SHIFT) & 548 QCA956X_PLL_CPU_CONFIG_REFDIV_MASK; 549 550 pll = __raw_readl(pll_base + QCA956X_PLL_CPU_CONFIG1_REG); 551 nint = (pll >> QCA956X_PLL_CPU_CONFIG1_NINT_SHIFT) & 552 QCA956X_PLL_CPU_CONFIG1_NINT_MASK; 553 hfrac = (pll >> QCA956X_PLL_CPU_CONFIG1_NFRAC_H_SHIFT) & 554 QCA956X_PLL_CPU_CONFIG1_NFRAC_H_MASK; 555 lfrac = (pll >> QCA956X_PLL_CPU_CONFIG1_NFRAC_L_SHIFT) & 556 QCA956X_PLL_CPU_CONFIG1_NFRAC_L_MASK; 557 558 cpu_pll = nint * ref_rate / ref_div; 559 cpu_pll += (lfrac * ref_rate) / ((ref_div * 25) << 13); 560 cpu_pll += (hfrac >> 13) * ref_rate / ref_div; 561 cpu_pll /= (1 << out_div); 562 563 pll = __raw_readl(pll_base + QCA956X_PLL_DDR_CONFIG_REG); 564 out_div = (pll >> QCA956X_PLL_DDR_CONFIG_OUTDIV_SHIFT) & 565 QCA956X_PLL_DDR_CONFIG_OUTDIV_MASK; 566 ref_div = (pll >> QCA956X_PLL_DDR_CONFIG_REFDIV_SHIFT) & 567 QCA956X_PLL_DDR_CONFIG_REFDIV_MASK; 568 pll = __raw_readl(pll_base + QCA956X_PLL_DDR_CONFIG1_REG); 569 nint = (pll >> QCA956X_PLL_DDR_CONFIG1_NINT_SHIFT) & 570 QCA956X_PLL_DDR_CONFIG1_NINT_MASK; 571 hfrac = (pll >> QCA956X_PLL_DDR_CONFIG1_NFRAC_H_SHIFT) & 572 QCA956X_PLL_DDR_CONFIG1_NFRAC_H_MASK; 573 lfrac = (pll >> QCA956X_PLL_DDR_CONFIG1_NFRAC_L_SHIFT) & 574 QCA956X_PLL_DDR_CONFIG1_NFRAC_L_MASK; 575 576 ddr_pll = nint * ref_rate / ref_div; 577 ddr_pll += (lfrac * ref_rate) / ((ref_div * 25) << 13); 578 ddr_pll += (hfrac >> 13) * ref_rate / ref_div; 579 ddr_pll /= (1 << out_div); 580 581 clk_ctrl = __raw_readl(pll_base + QCA956X_PLL_CLK_CTRL_REG); 582 583 postdiv = (clk_ctrl >> QCA956X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT) & 584 QCA956X_PLL_CLK_CTRL_CPU_POST_DIV_MASK; 585 586 if (clk_ctrl & QCA956X_PLL_CLK_CTRL_CPU_PLL_BYPASS) 587 cpu_rate = ref_rate; 588 else if (clk_ctrl & QCA956X_PLL_CLK_CTRL_CPU_DDRCLK_FROM_CPUPLL) 589 cpu_rate = ddr_pll / (postdiv + 1); 590 else 591 cpu_rate = cpu_pll / (postdiv + 1); 592 593 postdiv = (clk_ctrl >> QCA956X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT) & 594 QCA956X_PLL_CLK_CTRL_DDR_POST_DIV_MASK; 595 596 if (clk_ctrl & QCA956X_PLL_CLK_CTRL_DDR_PLL_BYPASS) 597 ddr_rate = ref_rate; 598 else if (clk_ctrl & QCA956X_PLL_CLK_CTRL_CPU_DDRCLK_FROM_DDRPLL) 599 ddr_rate = cpu_pll / (postdiv + 1); 600 else 601 ddr_rate = ddr_pll / (postdiv + 1); 602 603 postdiv = (clk_ctrl >> QCA956X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT) & 604 QCA956X_PLL_CLK_CTRL_AHB_POST_DIV_MASK; 605 606 if (clk_ctrl & QCA956X_PLL_CLK_CTRL_AHB_PLL_BYPASS) 607 ahb_rate = ref_rate; 608 else if (clk_ctrl & QCA956X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL) 609 ahb_rate = ddr_pll / (postdiv + 1); 610 else 611 ahb_rate = cpu_pll / (postdiv + 1); 612 613 ath79_set_clk(ATH79_CLK_CPU, cpu_rate); 614 ath79_set_clk(ATH79_CLK_DDR, ddr_rate); 615 ath79_set_clk(ATH79_CLK_AHB, ahb_rate); 616 } 617 ath79_clocks_init_dt(struct device_node * np)618 static void __init ath79_clocks_init_dt(struct device_node *np) 619 { 620 struct clk *ref_clk; 621 void __iomem *pll_base; 622 623 ref_clk = of_clk_get(np, 0); 624 if (!IS_ERR(ref_clk)) 625 clks[ATH79_CLK_REF] = ref_clk; 626 627 pll_base = of_iomap(np, 0); 628 if (!pll_base) { 629 pr_err("%pOF: can't map pll registers\n", np); 630 goto err_clk; 631 } 632 633 if (of_device_is_compatible(np, "qca,ar7100-pll")) 634 ar71xx_clocks_init(pll_base); 635 else if (of_device_is_compatible(np, "qca,ar7240-pll") || 636 of_device_is_compatible(np, "qca,ar9130-pll")) 637 ar724x_clocks_init(pll_base); 638 else if (of_device_is_compatible(np, "qca,ar9330-pll")) 639 ar933x_clocks_init(pll_base); 640 else if (of_device_is_compatible(np, "qca,ar9340-pll")) 641 ar934x_clocks_init(pll_base); 642 else if (of_device_is_compatible(np, "qca,qca9530-pll")) 643 qca953x_clocks_init(pll_base); 644 else if (of_device_is_compatible(np, "qca,qca9550-pll")) 645 qca955x_clocks_init(pll_base); 646 else if (of_device_is_compatible(np, "qca,qca9560-pll")) 647 qca956x_clocks_init(pll_base); 648 649 if (!clks[ATH79_CLK_MDIO]) 650 clks[ATH79_CLK_MDIO] = clks[ATH79_CLK_REF]; 651 652 if (of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data)) { 653 pr_err("%pOF: could not register clk provider\n", np); 654 goto err_iounmap; 655 } 656 657 return; 658 659 err_iounmap: 660 iounmap(pll_base); 661 662 err_clk: 663 clk_put(ref_clk); 664 } 665 666 CLK_OF_DECLARE(ar7100_clk, "qca,ar7100-pll", ath79_clocks_init_dt); 667 CLK_OF_DECLARE(ar7240_clk, "qca,ar7240-pll", ath79_clocks_init_dt); 668 CLK_OF_DECLARE(ar9130_clk, "qca,ar9130-pll", ath79_clocks_init_dt); 669 CLK_OF_DECLARE(ar9330_clk, "qca,ar9330-pll", ath79_clocks_init_dt); 670 CLK_OF_DECLARE(ar9340_clk, "qca,ar9340-pll", ath79_clocks_init_dt); 671 CLK_OF_DECLARE(ar9530_clk, "qca,qca9530-pll", ath79_clocks_init_dt); 672 CLK_OF_DECLARE(ar9550_clk, "qca,qca9550-pll", ath79_clocks_init_dt); 673 CLK_OF_DECLARE(ar9560_clk, "qca,qca9560-pll", ath79_clocks_init_dt); 674