1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr> 7 */ 8 9 #include <linux/init.h> 10 #include <linux/export.h> 11 #include <linux/mutex.h> 12 #include <linux/err.h> 13 #include <linux/clk.h> 14 #include <linux/clkdev.h> 15 #include <linux/delay.h> 16 #include <bcm63xx_cpu.h> 17 #include <bcm63xx_io.h> 18 #include <bcm63xx_regs.h> 19 #include <bcm63xx_reset.h> 20 21 struct clk { 22 void (*set)(struct clk *, int); 23 unsigned int rate; 24 unsigned int usage; 25 int id; 26 }; 27 28 static DEFINE_MUTEX(clocks_mutex); 29 30 31 static void clk_enable_unlocked(struct clk *clk) 32 { 33 if (clk->set && (clk->usage++) == 0) 34 clk->set(clk, 1); 35 } 36 37 static void clk_disable_unlocked(struct clk *clk) 38 { 39 if (clk->set && (--clk->usage) == 0) 40 clk->set(clk, 0); 41 } 42 43 static void bcm_hwclock_set(u32 mask, int enable) 44 { 45 u32 reg; 46 47 reg = bcm_perf_readl(PERF_CKCTL_REG); 48 if (enable) 49 reg |= mask; 50 else 51 reg &= ~mask; 52 bcm_perf_writel(reg, PERF_CKCTL_REG); 53 } 54 55 /* 56 * Ethernet MAC "misc" clock: dma clocks and main clock on 6348 57 */ 58 static void enet_misc_set(struct clk *clk, int enable) 59 { 60 u32 mask; 61 62 if (BCMCPU_IS_6338()) 63 mask = CKCTL_6338_ENET_EN; 64 else if (BCMCPU_IS_6345()) 65 mask = CKCTL_6345_ENET_EN; 66 else if (BCMCPU_IS_6348()) 67 mask = CKCTL_6348_ENET_EN; 68 else 69 /* BCMCPU_IS_6358 */ 70 mask = CKCTL_6358_EMUSB_EN; 71 bcm_hwclock_set(mask, enable); 72 } 73 74 static struct clk clk_enet_misc = { 75 .set = enet_misc_set, 76 }; 77 78 /* 79 * Ethernet MAC clocks: only relevant on 6358, silently enable misc 80 * clocks 81 */ 82 static void enetx_set(struct clk *clk, int enable) 83 { 84 if (enable) 85 clk_enable_unlocked(&clk_enet_misc); 86 else 87 clk_disable_unlocked(&clk_enet_misc); 88 89 if (BCMCPU_IS_3368() || BCMCPU_IS_6358()) { 90 u32 mask; 91 92 if (clk->id == 0) 93 mask = CKCTL_6358_ENET0_EN; 94 else 95 mask = CKCTL_6358_ENET1_EN; 96 bcm_hwclock_set(mask, enable); 97 } 98 } 99 100 static struct clk clk_enet0 = { 101 .id = 0, 102 .set = enetx_set, 103 }; 104 105 static struct clk clk_enet1 = { 106 .id = 1, 107 .set = enetx_set, 108 }; 109 110 /* 111 * Ethernet PHY clock 112 */ 113 static void ephy_set(struct clk *clk, int enable) 114 { 115 if (BCMCPU_IS_3368() || BCMCPU_IS_6358()) 116 bcm_hwclock_set(CKCTL_6358_EPHY_EN, enable); 117 } 118 119 120 static struct clk clk_ephy = { 121 .set = ephy_set, 122 }; 123 124 /* 125 * Ethernet switch SAR clock 126 */ 127 static void swpkt_sar_set(struct clk *clk, int enable) 128 { 129 if (BCMCPU_IS_6368()) 130 bcm_hwclock_set(CKCTL_6368_SWPKT_SAR_EN, enable); 131 else 132 return; 133 } 134 135 static struct clk clk_swpkt_sar = { 136 .set = swpkt_sar_set, 137 }; 138 139 /* 140 * Ethernet switch USB clock 141 */ 142 static void swpkt_usb_set(struct clk *clk, int enable) 143 { 144 if (BCMCPU_IS_6368()) 145 bcm_hwclock_set(CKCTL_6368_SWPKT_USB_EN, enable); 146 else 147 return; 148 } 149 150 static struct clk clk_swpkt_usb = { 151 .set = swpkt_usb_set, 152 }; 153 154 /* 155 * Ethernet switch clock 156 */ 157 static void enetsw_set(struct clk *clk, int enable) 158 { 159 if (BCMCPU_IS_6328()) { 160 bcm_hwclock_set(CKCTL_6328_ROBOSW_EN, enable); 161 } else if (BCMCPU_IS_6362()) { 162 bcm_hwclock_set(CKCTL_6362_ROBOSW_EN, enable); 163 } else if (BCMCPU_IS_6368()) { 164 if (enable) { 165 clk_enable_unlocked(&clk_swpkt_sar); 166 clk_enable_unlocked(&clk_swpkt_usb); 167 } else { 168 clk_disable_unlocked(&clk_swpkt_usb); 169 clk_disable_unlocked(&clk_swpkt_sar); 170 } 171 bcm_hwclock_set(CKCTL_6368_ROBOSW_EN, enable); 172 } else { 173 return; 174 } 175 176 if (enable) { 177 /* reset switch core afer clock change */ 178 bcm63xx_core_set_reset(BCM63XX_RESET_ENETSW, 1); 179 msleep(10); 180 bcm63xx_core_set_reset(BCM63XX_RESET_ENETSW, 0); 181 msleep(10); 182 } 183 } 184 185 static struct clk clk_enetsw = { 186 .set = enetsw_set, 187 }; 188 189 /* 190 * PCM clock 191 */ 192 static void pcm_set(struct clk *clk, int enable) 193 { 194 if (BCMCPU_IS_3368()) 195 bcm_hwclock_set(CKCTL_3368_PCM_EN, enable); 196 if (BCMCPU_IS_6358()) 197 bcm_hwclock_set(CKCTL_6358_PCM_EN, enable); 198 } 199 200 static struct clk clk_pcm = { 201 .set = pcm_set, 202 }; 203 204 /* 205 * USB host clock 206 */ 207 static void usbh_set(struct clk *clk, int enable) 208 { 209 if (BCMCPU_IS_6328()) 210 bcm_hwclock_set(CKCTL_6328_USBH_EN, enable); 211 else if (BCMCPU_IS_6348()) 212 bcm_hwclock_set(CKCTL_6348_USBH_EN, enable); 213 else if (BCMCPU_IS_6362()) 214 bcm_hwclock_set(CKCTL_6362_USBH_EN, enable); 215 else if (BCMCPU_IS_6368()) 216 bcm_hwclock_set(CKCTL_6368_USBH_EN, enable); 217 } 218 219 static struct clk clk_usbh = { 220 .set = usbh_set, 221 }; 222 223 /* 224 * USB device clock 225 */ 226 static void usbd_set(struct clk *clk, int enable) 227 { 228 if (BCMCPU_IS_6328()) 229 bcm_hwclock_set(CKCTL_6328_USBD_EN, enable); 230 else if (BCMCPU_IS_6362()) 231 bcm_hwclock_set(CKCTL_6362_USBD_EN, enable); 232 else if (BCMCPU_IS_6368()) 233 bcm_hwclock_set(CKCTL_6368_USBD_EN, enable); 234 } 235 236 static struct clk clk_usbd = { 237 .set = usbd_set, 238 }; 239 240 /* 241 * SPI clock 242 */ 243 static void spi_set(struct clk *clk, int enable) 244 { 245 u32 mask; 246 247 if (BCMCPU_IS_6338()) 248 mask = CKCTL_6338_SPI_EN; 249 else if (BCMCPU_IS_6348()) 250 mask = CKCTL_6348_SPI_EN; 251 else if (BCMCPU_IS_3368() || BCMCPU_IS_6358()) 252 mask = CKCTL_6358_SPI_EN; 253 else if (BCMCPU_IS_6362()) 254 mask = CKCTL_6362_SPI_EN; 255 else 256 /* BCMCPU_IS_6368 */ 257 mask = CKCTL_6368_SPI_EN; 258 bcm_hwclock_set(mask, enable); 259 } 260 261 static struct clk clk_spi = { 262 .set = spi_set, 263 }; 264 265 /* 266 * HSSPI clock 267 */ 268 static void hsspi_set(struct clk *clk, int enable) 269 { 270 u32 mask; 271 272 if (BCMCPU_IS_6328()) 273 mask = CKCTL_6328_HSSPI_EN; 274 else if (BCMCPU_IS_6362()) 275 mask = CKCTL_6362_HSSPI_EN; 276 else 277 return; 278 279 bcm_hwclock_set(mask, enable); 280 } 281 282 static struct clk clk_hsspi = { 283 .set = hsspi_set, 284 }; 285 286 /* 287 * HSSPI PLL 288 */ 289 static struct clk clk_hsspi_pll; 290 291 /* 292 * XTM clock 293 */ 294 static void xtm_set(struct clk *clk, int enable) 295 { 296 if (!BCMCPU_IS_6368()) 297 return; 298 299 if (enable) 300 clk_enable_unlocked(&clk_swpkt_sar); 301 else 302 clk_disable_unlocked(&clk_swpkt_sar); 303 304 bcm_hwclock_set(CKCTL_6368_SAR_EN, enable); 305 306 if (enable) { 307 /* reset sar core afer clock change */ 308 bcm63xx_core_set_reset(BCM63XX_RESET_SAR, 1); 309 mdelay(1); 310 bcm63xx_core_set_reset(BCM63XX_RESET_SAR, 0); 311 mdelay(1); 312 } 313 } 314 315 316 static struct clk clk_xtm = { 317 .set = xtm_set, 318 }; 319 320 /* 321 * IPsec clock 322 */ 323 static void ipsec_set(struct clk *clk, int enable) 324 { 325 if (BCMCPU_IS_6362()) 326 bcm_hwclock_set(CKCTL_6362_IPSEC_EN, enable); 327 else if (BCMCPU_IS_6368()) 328 bcm_hwclock_set(CKCTL_6368_IPSEC_EN, enable); 329 } 330 331 static struct clk clk_ipsec = { 332 .set = ipsec_set, 333 }; 334 335 /* 336 * PCIe clock 337 */ 338 339 static void pcie_set(struct clk *clk, int enable) 340 { 341 if (BCMCPU_IS_6328()) 342 bcm_hwclock_set(CKCTL_6328_PCIE_EN, enable); 343 else if (BCMCPU_IS_6362()) 344 bcm_hwclock_set(CKCTL_6362_PCIE_EN, enable); 345 } 346 347 static struct clk clk_pcie = { 348 .set = pcie_set, 349 }; 350 351 /* 352 * Internal peripheral clock 353 */ 354 static struct clk clk_periph = { 355 .rate = (50 * 1000 * 1000), 356 }; 357 358 359 /* 360 * Linux clock API implementation 361 */ 362 int clk_enable(struct clk *clk) 363 { 364 mutex_lock(&clocks_mutex); 365 clk_enable_unlocked(clk); 366 mutex_unlock(&clocks_mutex); 367 return 0; 368 } 369 370 EXPORT_SYMBOL(clk_enable); 371 372 void clk_disable(struct clk *clk) 373 { 374 if (!clk) 375 return; 376 377 mutex_lock(&clocks_mutex); 378 clk_disable_unlocked(clk); 379 mutex_unlock(&clocks_mutex); 380 } 381 382 EXPORT_SYMBOL(clk_disable); 383 384 unsigned long clk_get_rate(struct clk *clk) 385 { 386 if (!clk) 387 return 0; 388 389 return clk->rate; 390 } 391 392 EXPORT_SYMBOL(clk_get_rate); 393 394 int clk_set_rate(struct clk *clk, unsigned long rate) 395 { 396 return 0; 397 } 398 EXPORT_SYMBOL_GPL(clk_set_rate); 399 400 long clk_round_rate(struct clk *clk, unsigned long rate) 401 { 402 return 0; 403 } 404 EXPORT_SYMBOL_GPL(clk_round_rate); 405 406 static struct clk_lookup bcm3368_clks[] = { 407 /* fixed rate clocks */ 408 CLKDEV_INIT(NULL, "periph", &clk_periph), 409 CLKDEV_INIT("bcm63xx_uart.0", "refclk", &clk_periph), 410 CLKDEV_INIT("bcm63xx_uart.1", "refclk", &clk_periph), 411 /* gated clocks */ 412 CLKDEV_INIT(NULL, "enet0", &clk_enet0), 413 CLKDEV_INIT(NULL, "enet1", &clk_enet1), 414 CLKDEV_INIT(NULL, "ephy", &clk_ephy), 415 CLKDEV_INIT(NULL, "usbh", &clk_usbh), 416 CLKDEV_INIT(NULL, "usbd", &clk_usbd), 417 CLKDEV_INIT(NULL, "spi", &clk_spi), 418 CLKDEV_INIT(NULL, "pcm", &clk_pcm), 419 CLKDEV_INIT("bcm63xx_enet.0", "enet", &clk_enet0), 420 CLKDEV_INIT("bcm63xx_enet.1", "enet", &clk_enet1), 421 }; 422 423 static struct clk_lookup bcm6328_clks[] = { 424 /* fixed rate clocks */ 425 CLKDEV_INIT(NULL, "periph", &clk_periph), 426 CLKDEV_INIT("bcm63xx_uart.0", "refclk", &clk_periph), 427 CLKDEV_INIT("bcm63xx_uart.1", "refclk", &clk_periph), 428 CLKDEV_INIT("bcm63xx-hsspi.0", "pll", &clk_hsspi_pll), 429 /* gated clocks */ 430 CLKDEV_INIT(NULL, "enetsw", &clk_enetsw), 431 CLKDEV_INIT(NULL, "usbh", &clk_usbh), 432 CLKDEV_INIT(NULL, "usbd", &clk_usbd), 433 CLKDEV_INIT(NULL, "hsspi", &clk_hsspi), 434 CLKDEV_INIT(NULL, "pcie", &clk_pcie), 435 }; 436 437 static struct clk_lookup bcm6338_clks[] = { 438 /* fixed rate clocks */ 439 CLKDEV_INIT(NULL, "periph", &clk_periph), 440 CLKDEV_INIT("bcm63xx_uart.0", "refclk", &clk_periph), 441 /* gated clocks */ 442 CLKDEV_INIT(NULL, "enet0", &clk_enet0), 443 CLKDEV_INIT(NULL, "enet1", &clk_enet1), 444 CLKDEV_INIT(NULL, "ephy", &clk_ephy), 445 CLKDEV_INIT(NULL, "usbh", &clk_usbh), 446 CLKDEV_INIT(NULL, "usbd", &clk_usbd), 447 CLKDEV_INIT(NULL, "spi", &clk_spi), 448 CLKDEV_INIT("bcm63xx_enet.0", "enet", &clk_enet_misc), 449 }; 450 451 static struct clk_lookup bcm6345_clks[] = { 452 /* fixed rate clocks */ 453 CLKDEV_INIT(NULL, "periph", &clk_periph), 454 CLKDEV_INIT("bcm63xx_uart.0", "refclk", &clk_periph), 455 /* gated clocks */ 456 CLKDEV_INIT(NULL, "enet0", &clk_enet0), 457 CLKDEV_INIT(NULL, "enet1", &clk_enet1), 458 CLKDEV_INIT(NULL, "ephy", &clk_ephy), 459 CLKDEV_INIT(NULL, "usbh", &clk_usbh), 460 CLKDEV_INIT(NULL, "usbd", &clk_usbd), 461 CLKDEV_INIT(NULL, "spi", &clk_spi), 462 CLKDEV_INIT("bcm63xx_enet.0", "enet", &clk_enet_misc), 463 }; 464 465 static struct clk_lookup bcm6348_clks[] = { 466 /* fixed rate clocks */ 467 CLKDEV_INIT(NULL, "periph", &clk_periph), 468 CLKDEV_INIT("bcm63xx_uart.0", "refclk", &clk_periph), 469 /* gated clocks */ 470 CLKDEV_INIT(NULL, "enet0", &clk_enet0), 471 CLKDEV_INIT(NULL, "enet1", &clk_enet1), 472 CLKDEV_INIT(NULL, "ephy", &clk_ephy), 473 CLKDEV_INIT(NULL, "usbh", &clk_usbh), 474 CLKDEV_INIT(NULL, "usbd", &clk_usbd), 475 CLKDEV_INIT(NULL, "spi", &clk_spi), 476 CLKDEV_INIT("bcm63xx_enet.0", "enet", &clk_enet_misc), 477 CLKDEV_INIT("bcm63xx_enet.1", "enet", &clk_enet_misc), 478 }; 479 480 static struct clk_lookup bcm6358_clks[] = { 481 /* fixed rate clocks */ 482 CLKDEV_INIT(NULL, "periph", &clk_periph), 483 CLKDEV_INIT("bcm63xx_uart.0", "refclk", &clk_periph), 484 CLKDEV_INIT("bcm63xx_uart.1", "refclk", &clk_periph), 485 /* gated clocks */ 486 CLKDEV_INIT(NULL, "enet0", &clk_enet0), 487 CLKDEV_INIT(NULL, "enet1", &clk_enet1), 488 CLKDEV_INIT(NULL, "ephy", &clk_ephy), 489 CLKDEV_INIT(NULL, "usbh", &clk_usbh), 490 CLKDEV_INIT(NULL, "usbd", &clk_usbd), 491 CLKDEV_INIT(NULL, "spi", &clk_spi), 492 CLKDEV_INIT(NULL, "pcm", &clk_pcm), 493 CLKDEV_INIT(NULL, "swpkt_sar", &clk_swpkt_sar), 494 CLKDEV_INIT(NULL, "swpkt_usb", &clk_swpkt_usb), 495 CLKDEV_INIT("bcm63xx_enet.0", "enet", &clk_enet0), 496 CLKDEV_INIT("bcm63xx_enet.1", "enet", &clk_enet1), 497 }; 498 499 static struct clk_lookup bcm6362_clks[] = { 500 /* fixed rate clocks */ 501 CLKDEV_INIT(NULL, "periph", &clk_periph), 502 CLKDEV_INIT("bcm63xx_uart.0", "refclk", &clk_periph), 503 CLKDEV_INIT("bcm63xx_uart.1", "refclk", &clk_periph), 504 CLKDEV_INIT("bcm63xx-hsspi.0", "pll", &clk_hsspi_pll), 505 /* gated clocks */ 506 CLKDEV_INIT(NULL, "enetsw", &clk_enetsw), 507 CLKDEV_INIT(NULL, "usbh", &clk_usbh), 508 CLKDEV_INIT(NULL, "usbd", &clk_usbd), 509 CLKDEV_INIT(NULL, "spi", &clk_spi), 510 CLKDEV_INIT(NULL, "hsspi", &clk_hsspi), 511 CLKDEV_INIT(NULL, "pcie", &clk_pcie), 512 CLKDEV_INIT(NULL, "ipsec", &clk_ipsec), 513 }; 514 515 static struct clk_lookup bcm6368_clks[] = { 516 /* fixed rate clocks */ 517 CLKDEV_INIT(NULL, "periph", &clk_periph), 518 CLKDEV_INIT("bcm63xx_uart.0", "refclk", &clk_periph), 519 CLKDEV_INIT("bcm63xx_uart.1", "refclk", &clk_periph), 520 /* gated clocks */ 521 CLKDEV_INIT(NULL, "enetsw", &clk_enetsw), 522 CLKDEV_INIT(NULL, "usbh", &clk_usbh), 523 CLKDEV_INIT(NULL, "usbd", &clk_usbd), 524 CLKDEV_INIT(NULL, "spi", &clk_spi), 525 CLKDEV_INIT(NULL, "xtm", &clk_xtm), 526 CLKDEV_INIT(NULL, "ipsec", &clk_ipsec), 527 }; 528 529 #define HSSPI_PLL_HZ_6328 133333333 530 #define HSSPI_PLL_HZ_6362 400000000 531 532 static int __init bcm63xx_clk_init(void) 533 { 534 switch (bcm63xx_get_cpu_id()) { 535 case BCM3368_CPU_ID: 536 clkdev_add_table(bcm3368_clks, ARRAY_SIZE(bcm3368_clks)); 537 break; 538 case BCM6328_CPU_ID: 539 clk_hsspi_pll.rate = HSSPI_PLL_HZ_6328; 540 clkdev_add_table(bcm6328_clks, ARRAY_SIZE(bcm6328_clks)); 541 break; 542 case BCM6338_CPU_ID: 543 clkdev_add_table(bcm6338_clks, ARRAY_SIZE(bcm6338_clks)); 544 break; 545 case BCM6345_CPU_ID: 546 clkdev_add_table(bcm6345_clks, ARRAY_SIZE(bcm6345_clks)); 547 break; 548 case BCM6348_CPU_ID: 549 clkdev_add_table(bcm6348_clks, ARRAY_SIZE(bcm6348_clks)); 550 break; 551 case BCM6358_CPU_ID: 552 clkdev_add_table(bcm6358_clks, ARRAY_SIZE(bcm6358_clks)); 553 break; 554 case BCM6362_CPU_ID: 555 clk_hsspi_pll.rate = HSSPI_PLL_HZ_6362; 556 clkdev_add_table(bcm6362_clks, ARRAY_SIZE(bcm6362_clks)); 557 break; 558 case BCM6368_CPU_ID: 559 clkdev_add_table(bcm6368_clks, ARRAY_SIZE(bcm6368_clks)); 560 break; 561 } 562 563 return 0; 564 } 565 arch_initcall(bcm63xx_clk_init); 566