arch/mips/bcm63xx/clk.c

   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 after 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 after 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         if (!clk)
 365                 return 0;
 366         mutex_lock(&clocks_mutex);
 367         clk_enable_unlocked(clk);
 368         mutex_unlock(&clocks_mutex);
 369         return 0;
 370 }
 371
 372 EXPORT_SYMBOL(clk_enable);
 373
 374 void clk_disable(struct clk *clk)
 375 {
 376         if (!clk)
 377                 return;
 378
 379         mutex_lock(&clocks_mutex);
 380         clk_disable_unlocked(clk);
 381         mutex_unlock(&clocks_mutex);
 382 }
 383
 384 EXPORT_SYMBOL(clk_disable);
 385
 386 struct clk *clk_get_parent(struct clk *clk)
 387 {
 388         return NULL;
 389 }
 390 EXPORT_SYMBOL(clk_get_parent);
 391
 392 int clk_set_parent(struct clk *clk, struct clk *parent)
 393 {
 394         return 0;
 395 }
 396 EXPORT_SYMBOL(clk_set_parent);
 397
 398 unsigned long clk_get_rate(struct clk *clk)
 399 {
 400         if (!clk)
 401                 return 0;
 402
 403         return clk->rate;
 404 }
 405
 406 EXPORT_SYMBOL(clk_get_rate);
 407
 408 int clk_set_rate(struct clk *clk, unsigned long rate)
 409 {
 410         return 0;
 411 }
 412 EXPORT_SYMBOL_GPL(clk_set_rate);
 413
 414 long clk_round_rate(struct clk *clk, unsigned long rate)
 415 {
 416         return 0;
 417 }
 418 EXPORT_SYMBOL_GPL(clk_round_rate);
 419
 420 static struct clk_lookup bcm3368_clks[] = {
 421         /* fixed rate clocks */
 422         CLKDEV_INIT(NULL, "periph", &clk_periph),
 423         CLKDEV_INIT("bcm63xx_uart.0", "refclk", &clk_periph),
 424         CLKDEV_INIT("bcm63xx_uart.1", "refclk", &clk_periph),
 425         /* gated clocks */
 426         CLKDEV_INIT(NULL, "enet0", &clk_enet0),
 427         CLKDEV_INIT(NULL, "enet1", &clk_enet1),
 428         CLKDEV_INIT(NULL, "ephy", &clk_ephy),
 429         CLKDEV_INIT(NULL, "usbh", &clk_usbh),
 430         CLKDEV_INIT(NULL, "usbd", &clk_usbd),
 431         CLKDEV_INIT(NULL, "spi", &clk_spi),
 432         CLKDEV_INIT(NULL, "pcm", &clk_pcm),
 433         CLKDEV_INIT("bcm63xx_enet.0", "enet", &clk_enet0),
 434         CLKDEV_INIT("bcm63xx_enet.1", "enet", &clk_enet1),
 435 };
 436
 437 static struct clk_lookup bcm6328_clks[] = {
 438         /* fixed rate clocks */
 439         CLKDEV_INIT(NULL, "periph", &clk_periph),
 440         CLKDEV_INIT("bcm63xx_uart.0", "refclk", &clk_periph),
 441         CLKDEV_INIT("bcm63xx_uart.1", "refclk", &clk_periph),
 442         CLKDEV_INIT("bcm63xx-hsspi.0", "pll", &clk_hsspi_pll),
 443         /* gated clocks */
 444         CLKDEV_INIT(NULL, "enetsw", &clk_enetsw),
 445         CLKDEV_INIT(NULL, "usbh", &clk_usbh),
 446         CLKDEV_INIT(NULL, "usbd", &clk_usbd),
 447         CLKDEV_INIT(NULL, "hsspi", &clk_hsspi),
 448         CLKDEV_INIT(NULL, "pcie", &clk_pcie),
 449 };
 450
 451 static struct clk_lookup bcm6338_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 bcm6345_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 };
 478
 479 static struct clk_lookup bcm6348_clks[] = {
 480         /* fixed rate clocks */
 481         CLKDEV_INIT(NULL, "periph", &clk_periph),
 482         CLKDEV_INIT("bcm63xx_uart.0", "refclk", &clk_periph),
 483         /* gated clocks */
 484         CLKDEV_INIT(NULL, "enet0", &clk_enet0),
 485         CLKDEV_INIT(NULL, "enet1", &clk_enet1),
 486         CLKDEV_INIT(NULL, "ephy", &clk_ephy),
 487         CLKDEV_INIT(NULL, "usbh", &clk_usbh),
 488         CLKDEV_INIT(NULL, "usbd", &clk_usbd),
 489         CLKDEV_INIT(NULL, "spi", &clk_spi),
 490         CLKDEV_INIT("bcm63xx_enet.0", "enet", &clk_enet_misc),
 491         CLKDEV_INIT("bcm63xx_enet.1", "enet", &clk_enet_misc),
 492 };
 493
 494 static struct clk_lookup bcm6358_clks[] = {
 495         /* fixed rate clocks */
 496         CLKDEV_INIT(NULL, "periph", &clk_periph),
 497         CLKDEV_INIT("bcm63xx_uart.0", "refclk", &clk_periph),
 498         CLKDEV_INIT("bcm63xx_uart.1", "refclk", &clk_periph),
 499         /* gated clocks */
 500         CLKDEV_INIT(NULL, "enet0", &clk_enet0),
 501         CLKDEV_INIT(NULL, "enet1", &clk_enet1),
 502         CLKDEV_INIT(NULL, "ephy", &clk_ephy),
 503         CLKDEV_INIT(NULL, "usbh", &clk_usbh),
 504         CLKDEV_INIT(NULL, "usbd", &clk_usbd),
 505         CLKDEV_INIT(NULL, "spi", &clk_spi),
 506         CLKDEV_INIT(NULL, "pcm", &clk_pcm),
 507         CLKDEV_INIT(NULL, "swpkt_sar", &clk_swpkt_sar),
 508         CLKDEV_INIT(NULL, "swpkt_usb", &clk_swpkt_usb),
 509         CLKDEV_INIT("bcm63xx_enet.0", "enet", &clk_enet0),
 510         CLKDEV_INIT("bcm63xx_enet.1", "enet", &clk_enet1),
 511 };
 512
 513 static struct clk_lookup bcm6362_clks[] = {
 514         /* fixed rate clocks */
 515         CLKDEV_INIT(NULL, "periph", &clk_periph),
 516         CLKDEV_INIT("bcm63xx_uart.0", "refclk", &clk_periph),
 517         CLKDEV_INIT("bcm63xx_uart.1", "refclk", &clk_periph),
 518         CLKDEV_INIT("bcm63xx-hsspi.0", "pll", &clk_hsspi_pll),
 519         /* gated clocks */
 520         CLKDEV_INIT(NULL, "enetsw", &clk_enetsw),
 521         CLKDEV_INIT(NULL, "usbh", &clk_usbh),
 522         CLKDEV_INIT(NULL, "usbd", &clk_usbd),
 523         CLKDEV_INIT(NULL, "spi", &clk_spi),
 524         CLKDEV_INIT(NULL, "hsspi", &clk_hsspi),
 525         CLKDEV_INIT(NULL, "pcie", &clk_pcie),
 526         CLKDEV_INIT(NULL, "ipsec", &clk_ipsec),
 527 };
 528
 529 static struct clk_lookup bcm6368_clks[] = {
 530         /* fixed rate clocks */
 531         CLKDEV_INIT(NULL, "periph", &clk_periph),
 532         CLKDEV_INIT("bcm63xx_uart.0", "refclk", &clk_periph),
 533         CLKDEV_INIT("bcm63xx_uart.1", "refclk", &clk_periph),
 534         /* gated clocks */
 535         CLKDEV_INIT(NULL, "enetsw", &clk_enetsw),
 536         CLKDEV_INIT(NULL, "usbh", &clk_usbh),
 537         CLKDEV_INIT(NULL, "usbd", &clk_usbd),
 538         CLKDEV_INIT(NULL, "spi", &clk_spi),
 539         CLKDEV_INIT(NULL, "xtm", &clk_xtm),
 540         CLKDEV_INIT(NULL, "ipsec", &clk_ipsec),
 541 };
 542
 543 #define HSSPI_PLL_HZ_6328       133333333
 544 #define HSSPI_PLL_HZ_6362       400000000
 545
 546 static int __init bcm63xx_clk_init(void)
 547 {
 548         switch (bcm63xx_get_cpu_id()) {
 549         case BCM3368_CPU_ID:
 550                 clkdev_add_table(bcm3368_clks, ARRAY_SIZE(bcm3368_clks));
 551                 break;
 552         case BCM6328_CPU_ID:
 553                 clk_hsspi_pll.rate = HSSPI_PLL_HZ_6328;
 554                 clkdev_add_table(bcm6328_clks, ARRAY_SIZE(bcm6328_clks));
 555                 break;
 556         case BCM6338_CPU_ID:
 557                 clkdev_add_table(bcm6338_clks, ARRAY_SIZE(bcm6338_clks));
 558                 break;
 559         case BCM6345_CPU_ID:
 560                 clkdev_add_table(bcm6345_clks, ARRAY_SIZE(bcm6345_clks));
 561                 break;
 562         case BCM6348_CPU_ID:
 563                 clkdev_add_table(bcm6348_clks, ARRAY_SIZE(bcm6348_clks));
 564                 break;
 565         case BCM6358_CPU_ID:
 566                 clkdev_add_table(bcm6358_clks, ARRAY_SIZE(bcm6358_clks));
 567                 break;
 568         case BCM6362_CPU_ID:
 569                 clk_hsspi_pll.rate = HSSPI_PLL_HZ_6362;
 570                 clkdev_add_table(bcm6362_clks, ARRAY_SIZE(bcm6362_clks));
 571                 break;
 572         case BCM6368_CPU_ID:
 573                 clkdev_add_table(bcm6368_clks, ARRAY_SIZE(bcm6368_clks));
 574                 break;
 575         }
 576
 577         return 0;
 578 }
 579 arch_initcall(bcm63xx_clk_init);