1/*- 2 * Copyright (c) 2013-2014 Ruslan Bukin <br@bsdpad.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27/* 28 * Vybrid Family Clock Controller Module (CCM) 29 * Chapter 10, Vybrid Reference Manual, Rev. 5, 07/2013 30 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD: releng/10.2/sys/arm/freescale/vybrid/vf_ccm.c 266203 2014-05-16 00:14:50Z ian $"); 34 35#include <sys/param.h> 36#include <sys/systm.h> 37#include <sys/bus.h> 38#include <sys/kernel.h> 39#include <sys/module.h> 40#include <sys/malloc.h> 41#include <sys/rman.h> 42#include <sys/timeet.h> 43#include <sys/timetc.h> 44#include <sys/watchdog.h> 45 46#include <dev/fdt/fdt_common.h> 47#include <dev/ofw/openfirm.h> 48#include <dev/ofw/ofw_bus.h> 49#include <dev/ofw/ofw_bus_subr.h> 50 51#include <machine/bus.h> 52#include <machine/fdt.h> 53#include <machine/cpu.h> 54#include <machine/intr.h> 55 56#include <arm/freescale/vybrid/vf_common.h> 57 58#define CCM_CCR 0x00 /* Control Register */ 59#define CCM_CSR 0x04 /* Status Register */ 60#define CCM_CCSR 0x08 /* Clock Switcher Register */ 61#define CCM_CACRR 0x0C /* ARM Clock Root Register */ 62#define CCM_CSCMR1 0x10 /* Serial Clock Multiplexer Register 1 */ 63#define CCM_CSCDR1 0x14 /* Serial Clock Divider Register 1 */ 64#define CCM_CSCDR2 0x18 /* Serial Clock Divider Register 2 */ 65#define CCM_CSCDR3 0x1C /* Serial Clock Divider Register 3 */ 66#define CCM_CSCMR2 0x20 /* Serial Clock Multiplexer Register 2 */ 67#define CCM_CTOR 0x28 /* Testing Observability Register */ 68#define CCM_CLPCR 0x2C /* Low Power Control Register */ 69#define CCM_CISR 0x30 /* Interrupt Status Register */ 70#define CCM_CIMR 0x34 /* Interrupt Mask Register */ 71#define CCM_CCOSR 0x38 /* Clock Output Source Register */ 72#define CCM_CGPR 0x3C /* General Purpose Register */ 73 74#define CCM_CCGRN 12 75#define CCM_CCGR(n) (0x40 + (n * 0x04)) /* Clock Gating Register */ 76#define CCM_CMEOR(n) (0x70 + (n * 0x70)) /* Module Enable Override */ 77#define CCM_CCPGR(n) (0x90 + (n * 0x04)) /* Platform Clock Gating */ 78 79#define CCM_CPPDSR 0x88 /* PLL PFD Disable Status Register */ 80#define CCM_CCOWR 0x8C /* CORE Wakeup Register */ 81 82#define PLL3_PFD4_EN (1 << 31) 83#define PLL3_PFD3_EN (1 << 30) 84#define PLL3_PFD2_EN (1 << 29) 85#define PLL3_PFD1_EN (1 << 28) 86#define PLL2_PFD4_EN (1 << 15) 87#define PLL2_PFD3_EN (1 << 14) 88#define PLL2_PFD2_EN (1 << 13) 89#define PLL2_PFD1_EN (1 << 12) 90#define PLL1_PFD4_EN (1 << 11) 91#define PLL1_PFD3_EN (1 << 10) 92#define PLL1_PFD2_EN (1 << 9) 93#define PLL1_PFD1_EN (1 << 8) 94 95/* CCM_CCR */ 96#define FIRC_EN (1 << 16) 97#define FXOSC_EN (1 << 12) 98#define FXOSC_RDY (1 << 5) 99 100/* CCM_CSCDR1 */ 101#define ENET_TS_EN (1 << 23) 102#define RMII_CLK_EN (1 << 24) 103#define SAI3_EN (1 << 19) 104 105/* CCM_CSCDR2 */ 106#define ESAI_EN (1 << 30) 107#define ESDHC1_EN (1 << 29) 108#define ESDHC0_EN (1 << 28) 109#define NFC_EN (1 << 9) 110#define ESDHC1_DIV_S 20 111#define ESDHC1_DIV_M 0xf 112#define ESDHC0_DIV_S 16 113#define ESDHC0_DIV_M 0xf 114 115/* CCM_CSCDR3 */ 116#define DCU0_EN (1 << 19) 117 118#define QSPI1_EN (1 << 12) 119#define QSPI1_DIV (1 << 11) 120#define QSPI1_X2_DIV (1 << 10) 121#define QSPI1_X4_DIV_M 0x3 122#define QSPI1_X4_DIV_S 8 123 124#define QSPI0_EN (1 << 4) 125#define QSPI0_DIV (1 << 3) 126#define QSPI0_X2_DIV (1 << 2) 127#define QSPI0_X4_DIV_M 0x3 128#define QSPI0_X4_DIV_S 0 129 130#define SAI3_DIV_SHIFT 12 131#define SAI3_DIV_MASK 0xf 132#define ESAI_DIV_SHIFT 24 133#define ESAI_DIV_MASK 0xf 134 135#define PLL4_CLK_DIV_SHIFT 6 136#define PLL4_CLK_DIV_MASK 0x7 137 138#define IPG_CLK_DIV_SHIFT 11 139#define IPG_CLK_DIV_MASK 0x3 140 141#define ESAI_CLK_SEL_SHIFT 20 142#define ESAI_CLK_SEL_MASK 0x3 143 144#define SAI3_CLK_SEL_SHIFT 6 145#define SAI3_CLK_SEL_MASK 0x3 146 147#define CKO1_EN (1 << 10) 148#define CKO1_DIV_MASK 0xf 149#define CKO1_DIV_SHIFT 6 150#define CKO1_SEL_MASK 0x3f 151#define CKO1_SEL_SHIFT 0 152#define CKO1_PLL4_MAIN 0x6 153#define CKO1_PLL4_DIVD 0x7 154 155struct clk { 156 uint32_t reg; 157 uint32_t enable_reg; 158 uint32_t div_mask; 159 uint32_t div_shift; 160 uint32_t div_val; 161 uint32_t sel_reg; 162 uint32_t sel_mask; 163 uint32_t sel_shift; 164 uint32_t sel_val; 165}; 166 167static struct clk ipg_clk = { 168 .reg = CCM_CACRR, 169 .enable_reg = 0, 170 .div_mask = IPG_CLK_DIV_MASK, 171 .div_shift = IPG_CLK_DIV_SHIFT, 172 .div_val = 1, /* Divide by 2 */ 173 .sel_reg = 0, 174 .sel_mask = 0, 175 .sel_shift = 0, 176 .sel_val = 0, 177}; 178 179/* 180 PLL4 clock divider (before switching the clocks should be gated) 181 000 Divide by 1 (only if PLL frequency less than or equal to 650 MHz) 182 001 Divide by 4 183 010 Divide by 6 184 011 Divide by 8 185 100 Divide by 10 186 101 Divide by 12 187 110 Divide by 14 188 111 Divide by 16 189*/ 190 191static struct clk pll4_clk = { 192 .reg = CCM_CACRR, 193 .enable_reg = 0, 194 .div_mask = PLL4_CLK_DIV_MASK, 195 .div_shift = PLL4_CLK_DIV_SHIFT, 196 .div_val = 5, /* Divide by 12 */ 197 .sel_reg = 0, 198 .sel_mask = 0, 199 .sel_shift = 0, 200 .sel_val = 0, 201}; 202 203static struct clk sai3_clk = { 204 .reg = CCM_CSCDR1, 205 .enable_reg = SAI3_EN, 206 .div_mask = SAI3_DIV_MASK, 207 .div_shift = SAI3_DIV_SHIFT, 208 .div_val = 1, 209 .sel_reg = CCM_CSCMR1, 210 .sel_mask = SAI3_CLK_SEL_MASK, 211 .sel_shift = SAI3_CLK_SEL_SHIFT, 212 .sel_val = 0x3, /* Divided PLL4 main clock */ 213}; 214 215static struct clk cko1_clk = { 216 .reg = CCM_CCOSR, 217 .enable_reg = CKO1_EN, 218 .div_mask = CKO1_DIV_MASK, 219 .div_shift = CKO1_DIV_SHIFT, 220 .div_val = 1, 221 .sel_reg = CCM_CCOSR, 222 .sel_mask = CKO1_SEL_MASK, 223 .sel_shift = CKO1_SEL_SHIFT, 224 .sel_val = CKO1_PLL4_DIVD, 225}; 226 227static struct clk esdhc0_clk = { 228 .reg = CCM_CSCDR2, 229 .enable_reg = ESDHC0_EN, 230 .div_mask = ESDHC0_DIV_M, 231 .div_shift = ESDHC0_DIV_S, 232 .div_val = 0x9, 233 .sel_reg = 0, 234 .sel_mask = 0, 235 .sel_shift = 0, 236 .sel_val = 0, 237}; 238 239static struct clk esdhc1_clk = { 240 .reg = CCM_CSCDR2, 241 .enable_reg = ESDHC1_EN, 242 .div_mask = ESDHC1_DIV_M, 243 .div_shift = ESDHC1_DIV_S, 244 .div_val = 0x9, 245 .sel_reg = 0, 246 .sel_mask = 0, 247 .sel_shift = 0, 248 .sel_val = 0, 249}; 250 251static struct clk qspi0_clk = { 252 .reg = CCM_CSCDR3, 253 .enable_reg = QSPI0_EN, 254 .div_mask = 0, 255 .div_shift = 0, 256 .div_val = 0, 257 .sel_reg = 0, 258 .sel_mask = 0, 259 .sel_shift = 0, 260 .sel_val = 0, 261}; 262 263static struct clk dcu0_clk = { 264 .reg = CCM_CSCDR3, 265 .enable_reg = DCU0_EN, 266 .div_mask = 0x7, 267 .div_shift = 16, /* DCU0_DIV */ 268 .div_val = 0, /* divide by 1 */ 269 .sel_reg = 0, 270 .sel_mask = 0, 271 .sel_shift = 0, 272 .sel_val = 0, 273}; 274 275static struct clk enet_clk = { 276 .reg = CCM_CSCDR1, 277 .enable_reg = (ENET_TS_EN | RMII_CLK_EN), 278 .div_mask = 0, 279 .div_shift = 0, 280 .div_val = 0, 281 .sel_reg = 0, 282 .sel_mask = 0, 283 .sel_shift = 0, 284 .sel_val = 0, 285}; 286 287static struct clk nand_clk = { 288 .reg = CCM_CSCDR2, 289 .enable_reg = NFC_EN, 290 .div_mask = 0, 291 .div_shift = 0, 292 .div_val = 0, 293 .sel_reg = 0, 294 .sel_mask = 0, 295 .sel_shift = 0, 296 .sel_val = 0, 297}; 298 299/* 300 Divider to generate ESAI clock 301 0000 Divide by 1 302 0001 Divide by 2 303 ... ... 304 1111 Divide by 16 305*/ 306 307static struct clk esai_clk = { 308 .reg = CCM_CSCDR2, 309 .enable_reg = ESAI_EN, 310 .div_mask = ESAI_DIV_MASK, 311 .div_shift = ESAI_DIV_SHIFT, 312 .div_val = 3, /* Divide by 4 */ 313 .sel_reg = CCM_CSCMR1, 314 .sel_mask = ESAI_CLK_SEL_MASK, 315 .sel_shift = ESAI_CLK_SEL_SHIFT, 316 .sel_val = 0x3, /* Divided PLL4 main clock */ 317}; 318 319struct clock_entry { 320 char *name; 321 struct clk *clk; 322}; 323 324static struct clock_entry clock_map[] = { 325 {"ipg", &ipg_clk}, 326 {"pll4", &pll4_clk}, 327 {"sai3", &sai3_clk}, 328 {"cko1", &cko1_clk}, 329 {"esdhc0", &esdhc0_clk}, 330 {"esdhc1", &esdhc1_clk}, 331 {"qspi0", &qspi0_clk}, 332 {"dcu0", &dcu0_clk}, 333 {"enet", &enet_clk}, 334 {"nand", &nand_clk}, 335 {"esai", &esai_clk}, 336 {NULL, NULL} 337}; 338 339struct ccm_softc { 340 struct resource *res[1]; 341 bus_space_tag_t bst; 342 bus_space_handle_t bsh; 343 device_t dev; 344}; 345 346static struct resource_spec ccm_spec[] = { 347 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 348 { -1, 0 } 349}; 350 351static int 352ccm_probe(device_t dev) 353{ 354 355 if (!ofw_bus_status_okay(dev)) 356 return (ENXIO); 357 358 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-ccm")) 359 return (ENXIO); 360 361 device_set_desc(dev, "Vybrid Family CCM Unit"); 362 return (BUS_PROBE_DEFAULT); 363} 364 365static int 366set_clock(struct ccm_softc *sc, char *name) 367{ 368 struct clk *clk; 369 int reg; 370 int i; 371 372 for (i = 0; clock_map[i].name != NULL; i++) { 373 if (strcmp(clock_map[i].name, name) == 0) { 374#if 0 375 device_printf(sc->dev, "Configuring %s clk\n", name); 376#endif 377 clk = clock_map[i].clk; 378 if (clk->sel_reg != 0) { 379 reg = READ4(sc, clk->sel_reg); 380 reg &= ~(clk->sel_mask << clk->sel_shift); 381 reg |= (clk->sel_val << clk->sel_shift); 382 WRITE4(sc, clk->sel_reg, reg); 383 }; 384 385 reg = READ4(sc, clk->reg); 386 reg |= clk->enable_reg; 387 reg &= ~(clk->div_mask << clk->div_shift); 388 reg |= (clk->div_val << clk->div_shift); 389 WRITE4(sc, clk->reg, reg); 390 }; 391 }; 392 393 return (0); 394} 395 396static int 397ccm_fdt_set(struct ccm_softc *sc) 398{ 399 phandle_t child, parent, root; 400 int len; 401 char *fdt_config, *name; 402 403 root = OF_finddevice("/"); 404 len = 0; 405 parent = root; 406 407 /* Find 'clock_names' prop in the tree */ 408 for (child = OF_child(parent); child != 0; child = OF_peer(child)) { 409 410 /* Find a 'leaf'. Start the search from this node. */ 411 while (OF_child(child)) { 412 parent = child; 413 child = OF_child(child); 414 } 415 416 if (!fdt_is_enabled(child)) 417 continue; 418 419 if ((len = OF_getproplen(child, "clock_names")) > 0) { 420 len = OF_getproplen(child, "clock_names"); 421 OF_getprop_alloc(child, "clock_names", 1, 422 (void **)&fdt_config); 423 424 while (len > 0) { 425 name = fdt_config; 426 fdt_config += strlen(name) + 1; 427 len -= strlen(name) + 1; 428 set_clock(sc, name); 429 }; 430 }; 431 432 if (OF_peer(child) == 0) { 433 /* No more siblings. */ 434 child = parent; 435 parent = OF_parent(child); 436 } 437 } 438 439 return (0); 440} 441 442static int 443ccm_attach(device_t dev) 444{ 445 struct ccm_softc *sc; 446 int reg; 447 int i; 448 449 sc = device_get_softc(dev); 450 sc->dev = dev; 451 452 if (bus_alloc_resources(dev, ccm_spec, sc->res)) { 453 device_printf(dev, "could not allocate resources\n"); 454 return (ENXIO); 455 } 456 457 /* Memory interface */ 458 sc->bst = rman_get_bustag(sc->res[0]); 459 sc->bsh = rman_get_bushandle(sc->res[0]); 460 461 /* Enable oscillator */ 462 reg = READ4(sc, CCM_CCR); 463 reg |= (FIRC_EN | FXOSC_EN); 464 WRITE4(sc, CCM_CCR, reg); 465 466 /* Wait 10 times */ 467 for (i = 0; i < 10; i++) { 468 if (READ4(sc, CCM_CSR) & FXOSC_RDY) { 469 device_printf(sc->dev, "On board oscillator is ready.\n"); 470 break; 471 } 472 473 cpufunc_nullop(); 474 } 475 476 /* Clock is on during all modes, except stop mode. */ 477 for (i = 0; i < CCM_CCGRN; i++) { 478 WRITE4(sc, CCM_CCGR(i), 0xffffffff); 479 } 480 481 /* Take and apply FDT clocks */ 482 ccm_fdt_set(sc); 483 484 return (0); 485} 486 487static device_method_t ccm_methods[] = { 488 DEVMETHOD(device_probe, ccm_probe), 489 DEVMETHOD(device_attach, ccm_attach), 490 { 0, 0 } 491}; 492 493static driver_t ccm_driver = { 494 "ccm", 495 ccm_methods, 496 sizeof(struct ccm_softc), 497}; 498 499static devclass_t ccm_devclass; 500 501DRIVER_MODULE(ccm, simplebus, ccm_driver, ccm_devclass, 0, 0); 502