target/linux/generic-2.6/files/drivers/ssb/driver_chipcommon.c

   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 */
  19 enum {
  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
  29 static inline u32 chipco_read32(struct ssb_chipcommon *cc,
  30                                 u16 offset)
  31 {
  32         return ssb_read32(cc->dev, offset);
  33 }
  34
  35 static inline void chipco_write32(struct ssb_chipcommon *cc,
  36                                   u16 offset,
  37                                   u32 value)
  38 {
  39         ssb_write32(cc->dev, offset, value);
  40 }
  41
  42 void ssb_chipco_set_clockmode(struct ssb_chipcommon *cc,
  43                               enum ssb_clkmode mode)
  44 {
  45         struct ssb_device *ccdev = cc->dev;
  46         struct ssb_bus *bus;
  47         u32 tmp;
  48
  49         if (!ccdev)
  50                 return;
  51         bus = ccdev->bus;
  52         /* chipcommon cores prior to rev6 don't support dynamic clock control */
  53         if (ccdev->id.revision < 6)
  54                 return;
  55         /* chipcommon cores rev10 are a whole new ball game */
  56         if (ccdev->id.revision >= 10)
  57                 return;
  58         if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
  59                 return;
  60
  61         switch (mode) {
  62         case SSB_CLKMODE_SLOW:
  63                 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
  64                 tmp |= SSB_CHIPCO_SLOWCLKCTL_FSLOW;
  65                 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
  66                 break;
  67         case SSB_CLKMODE_FAST:
  68                 ssb_pci_xtal(bus, SSB_GPIO_XTAL, 1); /* Force crystal on */
  69                 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
  70                 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW;
  71                 tmp |= SSB_CHIPCO_SLOWCLKCTL_IPLL;
  72                 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
  73                 break;
  74         case SSB_CLKMODE_DYNAMIC:
  75                 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
  76                 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW;
  77                 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_IPLL;
  78                 tmp &= ~SSB_CHIPCO_SLOWCLKCTL_ENXTAL;
  79                 if ((tmp & SSB_CHIPCO_SLOWCLKCTL_SRC) != SSB_CHIPCO_SLOWCLKCTL_SRC_XTAL)
  80                         tmp |= SSB_CHIPCO_SLOWCLKCTL_ENXTAL;
  81                 chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
  82
  83                 /* for dynamic control, we have to release our xtal_pu "force on" */
  84                 if (tmp & SSB_CHIPCO_SLOWCLKCTL_ENXTAL)
  85                         ssb_pci_xtal(bus, SSB_GPIO_XTAL, 0);
  86                 break;
  87         default:
  88                 assert(0);
  89         }
  90 }
  91
  92 /* Get the Slow Clock Source */
  93 static int chipco_pctl_get_slowclksrc(struct ssb_chipcommon *cc)
  94 {
  95         struct ssb_bus *bus = cc->dev->bus;
  96         u32 tmp = 0;
  97
  98         if (cc->dev->id.revision < 6) {
  99                 if (bus->bustype == SSB_BUSTYPE_SSB ||
 100                     bus->bustype == SSB_BUSTYPE_PCMCIA)
 101                         return SSB_CHIPCO_CLKSRC_XTALOS;
 102                 if (bus->bustype == SSB_BUSTYPE_PCI) {
 103                         pci_read_config_dword(bus->host_pci, SSB_GPIO_OUT, &tmp);
 104                         if (tmp & 0x10)
 105                                 return SSB_CHIPCO_CLKSRC_PCI;
 106                         return SSB_CHIPCO_CLKSRC_XTALOS;
 107                 }
 108         }
 109         if (cc->dev->id.revision < 10) {
 110                 tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
 111                 tmp &= 0x7;
 112                 if (tmp == 0)
 113                         return SSB_CHIPCO_CLKSRC_LOPWROS;
 114                 if (tmp == 1)
 115                         return SSB_CHIPCO_CLKSRC_XTALOS;
 116                 if (tmp == 2)
 117                         return SSB_CHIPCO_CLKSRC_PCI;
 118         }
 119
 120         return SSB_CHIPCO_CLKSRC_XTALOS;
 121 }
 122
 123 /* Get maximum or minimum (depending on get_max flag) slowclock frequency. */
 124 static int chipco_pctl_clockfreqlimit(struct ssb_chipcommon *cc, int get_max)
 125 {
 126         int limit;
 127         int clocksrc;
 128         int divisor;
 129         u32 tmp;
 130
 131         clocksrc = chipco_pctl_get_slowclksrc(cc);
 132         if (cc->dev->id.revision < 6) {
 133                 switch (clocksrc) {
 134                 case SSB_CHIPCO_CLKSRC_PCI:
 135                         divisor = 64;
 136                         break;
 137                 case SSB_CHIPCO_CLKSRC_XTALOS:
 138                         divisor = 32;
 139                         break;
 140                 default:
 141                         assert(0);
 142                         divisor = 1;
 143                 }
 144         } else if (cc->dev->id.revision < 10) {
 145                 switch (clocksrc) {
 146                 case SSB_CHIPCO_CLKSRC_LOPWROS:
 147                         divisor = 1;
 148                         break;
 149                 case SSB_CHIPCO_CLKSRC_XTALOS:
 150                 case SSB_CHIPCO_CLKSRC_PCI:
 151                         tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
 152                         divisor = (tmp >> 16) + 1;
 153                         divisor *= 4;
 154                         break;
 155                 default:
 156                         assert(0);
 157                         divisor = 1;
 158                 }
 159         } else {
 160                 tmp = chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL);
 161                 divisor = (tmp >> 16) + 1;
 162                 divisor *= 4;
 163         }
 164
 165         switch (clocksrc) {
 166         case SSB_CHIPCO_CLKSRC_LOPWROS:
 167                 if (get_max)
 168                         limit = 43000;
 169                 else
 170                         limit = 25000;
 171                 break;
 172         case SSB_CHIPCO_CLKSRC_XTALOS:
 173                 if (get_max)
 174                         limit = 20200000;
 175                 else
 176                         limit = 19800000;
 177                 break;
 178         case SSB_CHIPCO_CLKSRC_PCI:
 179                 if (get_max)
 180                         limit = 34000000;
 181                 else
 182                         limit = 25000000;
 183                 break;
 184         default:
 185                 assert(0);
 186                 limit = 0;
 187         }
 188         limit /= divisor;
 189
 190         return limit;
 191 }
 192
 193 static void chipco_powercontrol_init(struct ssb_chipcommon *cc)
 194 {
 195         struct ssb_bus *bus = cc->dev->bus;
 196
 197         if (bus->chip_id == 0x4321) {
 198                 if (bus->chip_rev == 0)
 199                         chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0x3A4);
 200                 else if (bus->chip_rev == 1)
 201                         chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0xA4);
 202         }
 203
 204         if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
 205                 return;
 206
 207         if (cc->dev->id.revision >= 10) {
 208                 /* Set Idle Power clock rate to 1Mhz */
 209                 chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL,
 210                                (chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) &
 211                                 0x0000FFFF) | 0x00040000);
 212         } else {
 213                 int maxfreq;
 214
 215                 maxfreq = chipco_pctl_clockfreqlimit(cc, 1);
 216                 chipco_write32(cc, SSB_CHIPCO_PLLONDELAY,
 217                                (maxfreq * 150 + 999999) / 1000000);
 218                 chipco_write32(cc, SSB_CHIPCO_FREFSELDELAY,
 219                                (maxfreq * 15 + 999999) / 1000000);
 220         }
 221 }
 222
 223 static void calc_fast_powerup_delay(struct ssb_chipcommon *cc)
 224 {
 225         struct ssb_bus *bus = cc->dev->bus;
 226         int minfreq;
 227         unsigned int tmp;
 228         u32 pll_on_delay;
 229
 230         if (bus->bustype != SSB_BUSTYPE_PCI)
 231                 return;
 232         if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
 233                 return;
 234
 235         minfreq = chipco_pctl_clockfreqlimit(cc, 0);
 236         pll_on_delay = chipco_read32(cc, SSB_CHIPCO_PLLONDELAY);
 237         tmp = (((pll_on_delay + 2) * 1000000) + (minfreq - 1)) / minfreq;
 238         assert((tmp & ~0xFFFF) == 0);
 239
 240         cc->fast_pwrup_delay = tmp;
 241 }
 242
 243 void ssb_chipcommon_init(struct ssb_chipcommon *cc)
 244 {
 245         if (!cc->dev)
 246                 return; /* We don't have a ChipCommon */
 247         chipco_powercontrol_init(cc);
 248         ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);
 249         calc_fast_powerup_delay(cc);
 250 }
 251
 252 void ssb_chipco_suspend(struct ssb_chipcommon *cc, pm_message_t state)
 253 {
 254         if (!cc->dev)
 255                 return;
 256         ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW);
 257 }
 258
 259 void ssb_chipco_resume(struct ssb_chipcommon *cc)
 260 {
 261         if (!cc->dev)
 262                 return;
 263         chipco_powercontrol_init(cc);
 264         ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);
 265 }
 266
 267 void ssb_chipco_get_clockcontrol(struct ssb_chipcommon *cc,
 268                                  u32 *plltype, u32 *n, u32 *m)
 269 {
 270         *n = chipco_read32(cc, SSB_CHIPCO_CLOCK_N);
 271         *plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
 272         switch (*plltype) {
 273         case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */
 274                 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_MIPS);
 275                 break;
 276         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
 277                 if (cc->dev->bus->chip_id != 0x5365) {
 278                         *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_M2);
 279                         break;
 280                 }
 281                 /* Fallthough */
 282         default:
 283                 *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_SB);
 284         }
 285 }
 286
 287 void ssb_chipco_timing_init(struct ssb_chipcommon *cc,
 288                             unsigned long ns)
 289 {
 290         struct ssb_device *dev = cc->dev;
 291         struct ssb_bus *bus = dev->bus;
 292         u32 tmp;
 293
 294         /* set register for external IO to control LED. */
 295         chipco_write32(cc, SSB_CHIPCO_PROG_CFG, 0x11);
 296         tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT;            /* Waitcount-3 = 10ns */
 297         tmp |= DIV_ROUND_UP(40, ns) << SSB_PROG_WCNT_1_SHIFT;   /* Waitcount-1 = 40ns */
 298         tmp |= DIV_ROUND_UP(240, ns);                           /* Waitcount-0 = 240ns */
 299         chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp);       /* 0x01020a0c for a 100Mhz clock */
 300
 301         /* Set timing for the flash */
 302         tmp = DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_3_SHIFT;   /* Waitcount-3 = 10nS */
 303         tmp |= DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_1_SHIFT;  /* Waitcount-1 = 10nS */
 304         tmp |= DIV_ROUND_UP(120, ns);                           /* Waitcount-0 = 120nS */
 305         if ((bus->chip_id == 0x5365) ||
 306             (dev->id.revision < 9))
 307                 chipco_write32(cc, SSB_CHIPCO_FLASH_WAITCNT, tmp);
 308         if ((bus->chip_id == 0x5365) ||
 309             (dev->id.revision < 9) ||
 310             ((bus->chip_id == 0x5350) && (bus->chip_rev == 0)))
 311                 chipco_write32(cc, SSB_CHIPCO_PCMCIA_MEMWAIT, tmp);
 312
 313         if (bus->chip_id == 0x5350) {
 314                 /* Enable EXTIF */
 315                 tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT;      /* Waitcount-3 = 10ns */
 316                 tmp |= DIV_ROUND_UP(20, ns) << SSB_PROG_WCNT_2_SHIFT;  /* Waitcount-2 = 20ns */
 317                 tmp |= DIV_ROUND_UP(100, ns) << SSB_PROG_WCNT_1_SHIFT; /* Waitcount-1 = 100ns */
 318                 tmp |= DIV_ROUND_UP(120, ns);                     /* Waitcount-0 = 120ns */
 319                 chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp); /* 0x01020a0c for a 100Mhz clock */
 320         }
 321 }
 322
 323
 324 #ifdef CONFIG_SSB_SERIAL
 325 int ssb_chipco_serial_init(struct ssb_chipcommon *cc,
 326                            struct ssb_serial_port *ports)
 327 {
 328         struct ssb_bus *bus = cc->dev->bus;
 329         int nr_ports = 0;
 330         u32 plltype;
 331         unsigned int irq;
 332         u32 baud_base, div;
 333         u32 i, n;
 334
 335         plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
 336         irq = ssb_mips_irq(cc->dev);
 337
 338         if (plltype == SSB_PLLTYPE_1) {
 339                 /* PLL clock */
 340                 baud_base = ssb_calc_clock_rate(plltype,
 341                                                 chipco_read32(cc, SSB_CHIPCO_CLOCK_N),
 342                                                 chipco_read32(cc, SSB_CHIPCO_CLOCK_M2));
 343                 div = 1;
 344         } else {
 345                 if (cc->dev->id.revision >= 11) {
 346                         /* Fixed ALP clock */
 347                         baud_base = 20000000;
 348                         div = 1;
 349                         /* Set the override bit so we don't divide it */
 350                         chipco_write32(cc, SSB_CHIPCO_CORECTL,
 351                                        SSB_CHIPCO_CORECTL_UARTCLK0);
 352                 } else if (cc->dev->id.revision >= 3) {
 353                         /* Internal backplane clock */
 354                         baud_base = ssb_clockspeed(bus);
 355                         div = 2; /* Minimum divisor */
 356                         chipco_write32(cc, SSB_CHIPCO_CLKDIV,
 357                                        (chipco_read32(cc, SSB_CHIPCO_CLKDIV)
 358                                         & ~SSB_CHIPCO_CLKDIV_UART) | div);
 359                 } else {
 360                         /* Fixed internal backplane clock */
 361                         baud_base = 88000000;
 362                         div = 48;
 363                 }
 364
 365                 /* Clock source depends on strapping if UartClkOverride is unset */
 366                 if ((cc->dev->id.revision > 0) &&
 367                     !(chipco_read32(cc, SSB_CHIPCO_CORECTL) & SSB_CHIPCO_CORECTL_UARTCLK0)) {
 368                         if ((cc->capabilities & SSB_CHIPCO_CAP_UARTCLK) ==
 369                             SSB_CHIPCO_CAP_UARTCLK_INT) {
 370                                 /* Internal divided backplane clock */
 371                                 baud_base /= div;
 372                         } else {
 373                                 /* Assume external clock of 1.8432 MHz */
 374                                 baud_base = 1843200;
 375                         }
 376                 }
 377         }
 378
 379         /* Determine the registers of the UARTs */
 380         n = (cc->capabilities & SSB_CHIPCO_CAP_NRUART);
 381         for (i = 0; i < n; i++) {
 382                 void __iomem *cc_mmio;
 383                 void __iomem *uart_regs;
 384
 385                 cc_mmio = cc->dev->bus->mmio + (cc->dev->core_index * SSB_CORE_SIZE);
 386                 uart_regs = cc_mmio + SSB_CHIPCO_UART0_DATA;
 387                 /* Offset changed at after rev 0 */
 388                 if (cc->dev->id.revision == 0)
 389                         uart_regs += (i * 8);
 390                 else
 391                         uart_regs += (i * 256);
 392
 393                 nr_ports++;
 394                 ports[i].regs = uart_regs;
 395                 ports[i].irq = irq;
 396                 ports[i].baud_base = baud_base;
 397                 ports[i].reg_shift = 0;
 398         }
 399
 400         return nr_ports;
 401 }
 402 #endif /* CONFIG_SSB_SERIAL */