1/* 2 * Sonics Silicon Backplane 3 * Broadcom ChipCommon core driver 4 * 5 * Copyright 2005, Broadcom Corporation 6 * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de> 7 * 8 * Licensed under the GNU/GPL. See COPYING for details. 9 */ 10 11#include <linux/ssb/ssb.h> 12#include <linux/ssb/ssb_regs.h> 13#include <linux/pci.h> 14 15#include "ssb_private.h" 16 17 18/* Clock sources */ 19enum ssb_clksrc { 20 /* PCI clock */ 21 SSB_CHIPCO_CLKSRC_PCI, 22 /* Crystal slow clock oscillator */ 23 SSB_CHIPCO_CLKSRC_XTALOS, 24 /* Low power oscillator */ 25 SSB_CHIPCO_CLKSRC_LOPWROS, 26}; 27 28 29static inline u32 chipco_write32_masked(struct ssb_chipcommon *cc, u16 offset, 30 u32 mask, u32 value) 31{ 32 value &= mask; 33 value |= chipco_read32(cc, offset) & ~mask; 34 chipco_write32(cc, offset, value); 35 36 return value; 37} 38 39void ssb_chipco_set_clockmode(struct ssb_chipcommon *cc, 40 enum ssb_clkmode mode) 41{ 42 struct ssb_device *ccdev = cc->dev; 43 struct ssb_bus *bus; 44 u32 tmp; 45 46 if (!ccdev) 47 return; 48 bus = ccdev->bus; 49 /* chipcommon cores prior to rev6 don't support dynamic clock control */ 50 if (ccdev->id.revision < 6) 51 return; 52 /* chipcommon cores rev10 are a whole new ball game */ 53 if (ccdev->id.revision >= 10) 54 return; 55 if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL)) 56 return; 57 58 switch (mode) { 59 case SSB_CLKMODE_SLOW: 60 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL); 61 tmp |= SSB_CHIPCO_SLOWCLKCTL_FSLOW; 62 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp); 63 break; 64 case SSB_CLKMODE_FAST: 65 ssb_pci_xtal(bus, SSB_GPIO_XTAL, 1); /* Force crystal on */ 66 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL); 67 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW; 68 tmp |= SSB_CHIPCO_SLOWCLKCTL_IPLL; 69 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp); 70 break; 71 case SSB_CLKMODE_DYNAMIC: 72 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL); 73 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW; 74 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_IPLL; 75 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_ENXTAL; 76 if ((tmp & SSB_CHIPCO_SLOWCLKCTL_SRC) != SSB_CHIPCO_SLOWCLKCTL_SRC_XTAL) 77 tmp |= SSB_CHIPCO_SLOWCLKCTL_ENXTAL; 78 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp); 79 80 /* for dynamic control, we have to release our xtal_pu "force on" */ 81 if (tmp & SSB_CHIPCO_SLOWCLKCTL_ENXTAL) 82 ssb_pci_xtal(bus, SSB_GPIO_XTAL, 0); 83 break; 84 default: 85 SSB_WARN_ON(1); 86 } 87} 88 89/* Get the Slow Clock Source */ 90static enum ssb_clksrc chipco_pctl_get_slowclksrc(struct ssb_chipcommon *cc) 91{ 92 struct ssb_bus *bus = cc->dev->bus; 93 u32 uninitialized_var(tmp); 94 95 if (cc->dev->id.revision < 6) { 96 if (bus->bustype == SSB_BUSTYPE_SSB || 97 bus->bustype == SSB_BUSTYPE_PCMCIA) 98 return SSB_CHIPCO_CLKSRC_XTALOS; 99 if (bus->bustype == SSB_BUSTYPE_PCI) { 100 pci_read_config_dword(bus->host_pci, SSB_GPIO_OUT, &tmp); 101 if (tmp & 0x10) 102 return SSB_CHIPCO_CLKSRC_PCI; 103 return SSB_CHIPCO_CLKSRC_XTALOS; 104 } 105 } 106 if (cc->dev->id.revision < 10) { 107 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL); 108 tmp &= 0x7; 109 if (tmp == 0) 110 return SSB_CHIPCO_CLKSRC_LOPWROS; 111 if (tmp == 1) 112 return SSB_CHIPCO_CLKSRC_XTALOS; 113 if (tmp == 2) 114 return SSB_CHIPCO_CLKSRC_PCI; 115 } 116 117 return SSB_CHIPCO_CLKSRC_XTALOS; 118} 119 120/* Get maximum or minimum (depending on get_max flag) slowclock frequency. */ 121static int chipco_pctl_clockfreqlimit(struct ssb_chipcommon *cc, int get_max) 122{ 123 int uninitialized_var(limit); 124 enum ssb_clksrc clocksrc; 125 int divisor = 1; 126 u32 tmp; 127 128 clocksrc = chipco_pctl_get_slowclksrc(cc); 129 if (cc->dev->id.revision < 6) { 130 switch (clocksrc) { 131 case SSB_CHIPCO_CLKSRC_PCI: 132 divisor = 64; 133 break; 134 case SSB_CHIPCO_CLKSRC_XTALOS: 135 divisor = 32; 136 break; 137 default: 138 SSB_WARN_ON(1); 139 } 140 } else if (cc->dev->id.revision < 10) { 141 switch (clocksrc) { 142 case SSB_CHIPCO_CLKSRC_LOPWROS: 143 break; 144 case SSB_CHIPCO_CLKSRC_XTALOS: 145 case SSB_CHIPCO_CLKSRC_PCI: 146 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL); 147 divisor = (tmp >> 16) + 1; 148 divisor *= 4; 149 break; 150 } 151 } else { 152 tmp = chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL); 153 divisor = (tmp >> 16) + 1; 154 divisor *= 4; 155 } 156 157 switch (clocksrc) { 158 case SSB_CHIPCO_CLKSRC_LOPWROS: 159 if (get_max) 160 limit = 43000; 161 else 162 limit = 25000; 163 break; 164 case SSB_CHIPCO_CLKSRC_XTALOS: 165 if (get_max) 166 limit = 20200000; 167 else 168 limit = 19800000; 169 break; 170 case SSB_CHIPCO_CLKSRC_PCI: 171 if (get_max) 172 limit = 34000000; 173 else 174 limit = 25000000; 175 break; 176 } 177 limit /= divisor; 178 179 return limit; 180} 181 182static void chipco_powercontrol_init(struct ssb_chipcommon *cc) 183{ 184 struct ssb_bus *bus = cc->dev->bus; 185 186 if (bus->chip_id == 0x4321) { 187 if (bus->chip_rev == 0) 188 chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0x3A4); 189 else if (bus->chip_rev == 1) 190 chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0xA4); 191 } 192 193 if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL)) 194 return; 195 196 if (cc->dev->id.revision >= 10) { 197 /* Set Idle Power clock rate to 1Mhz */ 198 chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL, 199 (chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) & 200 0x0000FFFF) | 0x00040000); 201 } else { 202 int maxfreq; 203 204 maxfreq = chipco_pctl_clockfreqlimit(cc, 1); 205 chipco_write32(cc, SSB_CHIPCO_PLLONDELAY, 206 (maxfreq * 150 + 999999) / 1000000); 207 chipco_write32(cc, SSB_CHIPCO_FREFSELDELAY, 208 (maxfreq * 15 + 999999) / 1000000); 209 } 210} 211 212/* http://bcm-v4.sipsolutions.net/802.11/PmuFastPwrupDelay */ 213static u16 pmu_fast_powerup_delay(struct ssb_chipcommon *cc) 214{ 215 struct ssb_bus *bus = cc->dev->bus; 216 217 switch (bus->chip_id) { 218 case 0x4312: 219 case 0x4322: 220 case 0x4328: 221 return 7000; 222 case 0x4325: 223 /* TODO: */ 224 default: 225 return 15000; 226 } 227} 228 229/* http://bcm-v4.sipsolutions.net/802.11/ClkctlFastPwrupDelay */ 230static void calc_fast_powerup_delay(struct ssb_chipcommon *cc) 231{ 232 struct ssb_bus *bus = cc->dev->bus; 233 int minfreq; 234 unsigned int tmp; 235 u32 pll_on_delay; 236 237 if (bus->bustype != SSB_BUSTYPE_PCI) 238 return; 239 240 if (cc->capabilities & SSB_CHIPCO_CAP_PMU) { 241 cc->fast_pwrup_delay = pmu_fast_powerup_delay(cc); 242 return; 243 } 244 245 if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL)) 246 return; 247 248 minfreq = chipco_pctl_clockfreqlimit(cc, 0); 249 pll_on_delay = chipco_read32(cc, SSB_CHIPCO_PLLONDELAY); 250 tmp = (((pll_on_delay + 2) * 1000000) + (minfreq - 1)) / minfreq; 251 SSB_WARN_ON(tmp & ~0xFFFF); 252 253 cc->fast_pwrup_delay = tmp; 254} 255 256void ssb_chipcommon_init(struct ssb_chipcommon *cc) 257{ 258 if (!cc->dev) 259 return; /* We don't have a ChipCommon */ 260 if (cc->dev->id.revision >= 11) 261 cc->status = chipco_read32(cc, SSB_CHIPCO_CHIPSTAT); 262 ssb_dprintk(KERN_INFO PFX "chipcommon status is 0x%x\n", cc->status); 263 ssb_pmu_init(cc); 264 chipco_powercontrol_init(cc); 265 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST); 266 calc_fast_powerup_delay(cc); 267} 268 269void ssb_chipco_suspend(struct ssb_chipcommon *cc) 270{ 271 if (!cc->dev) 272 return; 273 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW); 274} 275 276void ssb_chipco_resume(struct ssb_chipcommon *cc) 277{ 278 if (!cc->dev) 279 return; 280 chipco_powercontrol_init(cc); 281 ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST); 282} 283 284/* Get the processor clock */ 285void ssb_chipco_get_clockcpu(struct ssb_chipcommon *cc, 286 u32 *plltype, u32 *n, u32 *m) 287{ 288 *n = chipco_read32(cc, SSB_CHIPCO_CLOCK_N); 289 *plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT); 290 switch (*plltype) { 291 case SSB_PLLTYPE_2: 292 case SSB_PLLTYPE_4: 293 case SSB_PLLTYPE_6: 294 case SSB_PLLTYPE_7: 295 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_MIPS); 296 break; 297 case SSB_PLLTYPE_3: 298 /* 5350 uses m2 to control mips */ 299 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_M2); 300 break; 301 default: 302 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_SB); 303 break; 304 } 305} 306 307/* Get the bus clock */ 308void ssb_chipco_get_clockcontrol(struct ssb_chipcommon *cc, 309 u32 *plltype, u32 *n, u32 *m) 310{ 311 *n = chipco_read32(cc, SSB_CHIPCO_CLOCK_N); 312 *plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT); 313 switch (*plltype) { 314 case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */ 315 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_MIPS); 316 break; 317 case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */ 318 if (cc->dev->bus->chip_id != 0x5365) { 319 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_M2); 320 break; 321 } 322 /* Fallthough */ 323 default: 324 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_SB); 325 } 326} 327 328void ssb_chipco_timing_init(struct ssb_chipcommon *cc, 329 unsigned long ns) 330{ 331 struct ssb_device *dev = cc->dev; 332 struct ssb_bus *bus = dev->bus; 333 u32 tmp; 334 335 /* set register for external IO to control LED. */ 336 chipco_write32(cc, SSB_CHIPCO_PROG_CFG, 0x11); 337 tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT; /* Waitcount-3 = 10ns */ 338 tmp |= DIV_ROUND_UP(40, ns) << SSB_PROG_WCNT_1_SHIFT; /* Waitcount-1 = 40ns */ 339 tmp |= DIV_ROUND_UP(240, ns); /* Waitcount-0 = 240ns */ 340 chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp); /* 0x01020a0c for a 100Mhz clock */ 341 342 /* Set timing for the flash */ 343 tmp = DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_3_SHIFT; /* Waitcount-3 = 10nS */ 344 tmp |= DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_1_SHIFT; /* Waitcount-1 = 10nS */ 345 tmp |= DIV_ROUND_UP(120, ns); /* Waitcount-0 = 120nS */ 346 if ((bus->chip_id == 0x5365) || 347 (dev->id.revision < 9)) 348 chipco_write32(cc, SSB_CHIPCO_FLASH_WAITCNT, tmp); 349 if ((bus->chip_id == 0x5365) || 350 (dev->id.revision < 9) || 351 ((bus->chip_id == 0x5350) && (bus->chip_rev == 0))) 352 chipco_write32(cc, SSB_CHIPCO_PCMCIA_MEMWAIT, tmp); 353 354 if (bus->chip_id == 0x5350) { 355 /* Enable EXTIF */ 356 tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT; /* Waitcount-3 = 10ns */ 357 tmp |= DIV_ROUND_UP(20, ns) << SSB_PROG_WCNT_2_SHIFT; /* Waitcount-2 = 20ns */ 358 tmp |= DIV_ROUND_UP(100, ns) << SSB_PROG_WCNT_1_SHIFT; /* Waitcount-1 = 100ns */ 359 tmp |= DIV_ROUND_UP(120, ns); /* Waitcount-0 = 120ns */ 360 chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp); /* 0x01020a0c for a 100Mhz clock */ 361 } 362} 363 364/* Set chip watchdog reset timer to fire in 'ticks' backplane cycles */ 365void ssb_chipco_watchdog_timer_set(struct ssb_chipcommon *cc, u32 ticks) 366{ 367 /* instant NMI */ 368 chipco_write32(cc, SSB_CHIPCO_WATCHDOG, ticks); 369} 370 371void ssb_chipco_irq_mask(struct ssb_chipcommon *cc, u32 mask, u32 value) 372{ 373 chipco_write32_masked(cc, SSB_CHIPCO_IRQMASK, mask, value); 374} 375 376u32 ssb_chipco_irq_status(struct ssb_chipcommon *cc, u32 mask) 377{ 378 return chipco_read32(cc, SSB_CHIPCO_IRQSTAT) & mask; 379} 380 381u32 ssb_chipco_gpio_in(struct ssb_chipcommon *cc, u32 mask) 382{ 383 return chipco_read32(cc, SSB_CHIPCO_GPIOIN) & mask; 384} 385 386u32 ssb_chipco_gpio_out(struct ssb_chipcommon *cc, u32 mask, u32 value) 387{ 388 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUT, mask, value); 389} 390 391u32 ssb_chipco_gpio_outen(struct ssb_chipcommon *cc, u32 mask, u32 value) 392{ 393 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUTEN, mask, value); 394} 395 396u32 ssb_chipco_gpio_control(struct ssb_chipcommon *cc, u32 mask, u32 value) 397{ 398 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOCTL, mask, value); 399} 400EXPORT_SYMBOL(ssb_chipco_gpio_control); 401 402u32 ssb_chipco_gpio_intmask(struct ssb_chipcommon *cc, u32 mask, u32 value) 403{ 404 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOIRQ, mask, value); 405} 406 407u32 ssb_chipco_gpio_polarity(struct ssb_chipcommon *cc, u32 mask, u32 value) 408{ 409 return chipco_write32_masked(cc, SSB_CHIPCO_GPIOPOL, mask, value); 410} 411 412#ifdef CONFIG_SSB_SERIAL 413int ssb_chipco_serial_init(struct ssb_chipcommon *cc, 414 struct ssb_serial_port *ports) 415{ 416 struct ssb_bus *bus = cc->dev->bus; 417 int nr_ports = 0; 418 u32 plltype; 419 unsigned int irq; 420 u32 baud_base, div; 421 u32 i, n; 422 unsigned int ccrev = cc->dev->id.revision; 423 424 plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT); 425 irq = ssb_mips_irq(cc->dev); 426 427 if (plltype == SSB_PLLTYPE_1) { 428 /* PLL clock */ 429 baud_base = ssb_calc_clock_rate(plltype, 430 chipco_read32(cc, SSB_CHIPCO_CLOCK_N), 431 chipco_read32(cc, SSB_CHIPCO_CLOCK_M2)); 432 div = 1; 433 } else { 434 if (ccrev == 20) { 435 /* BCM5354 uses constant 25MHz clock */ 436 baud_base = 25000000; 437 div = 48; 438 /* Set the override bit so we don't divide it */ 439 chipco_write32(cc, SSB_CHIPCO_CORECTL, 440 chipco_read32(cc, SSB_CHIPCO_CORECTL) 441 | SSB_CHIPCO_CORECTL_UARTCLK0); 442 } else if ((ccrev >= 11) && (ccrev != 15)) { 443 /* Fixed ALP clock */ 444 baud_base = 20000000; 445 if (cc->capabilities & SSB_CHIPCO_CAP_PMU) { 446 SSB_WARN_ON(1); 447 } 448 div = 1; 449 if (ccrev >= 21) { 450 /* Turn off UART clock before switching clocksource. */ 451 chipco_write32(cc, SSB_CHIPCO_CORECTL, 452 chipco_read32(cc, SSB_CHIPCO_CORECTL) 453 & ~SSB_CHIPCO_CORECTL_UARTCLKEN); 454 } 455 /* Set the override bit so we don't divide it */ 456 chipco_write32(cc, SSB_CHIPCO_CORECTL, 457 chipco_read32(cc, SSB_CHIPCO_CORECTL) 458 | SSB_CHIPCO_CORECTL_UARTCLK0); 459 if (ccrev >= 21) { 460 /* Re-enable the UART clock. */ 461 chipco_write32(cc, SSB_CHIPCO_CORECTL, 462 chipco_read32(cc, SSB_CHIPCO_CORECTL) 463 | SSB_CHIPCO_CORECTL_UARTCLKEN); 464 } 465 } else if (ccrev >= 3) { 466 /* Internal backplane clock */ 467 baud_base = ssb_clockspeed(bus); 468 div = chipco_read32(cc, SSB_CHIPCO_CLKDIV) 469 & SSB_CHIPCO_CLKDIV_UART; 470 } else { 471 /* Fixed internal backplane clock */ 472 baud_base = 88000000; 473 div = 48; 474 } 475 476 /* Clock source depends on strapping if UartClkOverride is unset */ 477 if ((ccrev > 0) && 478 !(chipco_read32(cc, SSB_CHIPCO_CORECTL) & SSB_CHIPCO_CORECTL_UARTCLK0)) { 479 if ((cc->capabilities & SSB_CHIPCO_CAP_UARTCLK) == 480 SSB_CHIPCO_CAP_UARTCLK_INT) { 481 /* Internal divided backplane clock */ 482 baud_base /= div; 483 } else { 484 /* Assume external clock of 1.8432 MHz */ 485 baud_base = 1843200; 486 } 487 } 488 } 489 490 /* Determine the registers of the UARTs */ 491 n = (cc->capabilities & SSB_CHIPCO_CAP_NRUART); 492 for (i = 0; i < n; i++) { 493 void __iomem *cc_mmio; 494 void __iomem *uart_regs; 495 496 cc_mmio = cc->dev->bus->mmio + (cc->dev->core_index * SSB_CORE_SIZE); 497 uart_regs = cc_mmio + SSB_CHIPCO_UART0_DATA; 498 /* Offset changed at after rev 0 */ 499 if (ccrev == 0) 500 uart_regs += (i * 8); 501 else 502 uart_regs += (i * 256); 503 504 nr_ports++; 505 ports[i].regs = uart_regs; 506 ports[i].irq = irq; 507 ports[i].baud_base = baud_base; 508 ports[i].reg_shift = 0; 509 } 510 511 return nr_ports; 512} 513#endif /* CONFIG_SSB_SERIAL */ 514