drivers/clk/pxa/clk-pxa27x.c

   1 /*
   2  * Marvell PXA27x family clocks
   3  *
   4  * Copyright (C) 2014 Robert Jarzmik
   5  *
   6  * Heavily inspired from former arch/arm/mach-pxa/clock.c.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; version 2 of the License.
  11  *
  12  */
  13 #include <linux/clk-provider.h>
  14 #include <mach/pxa2xx-regs.h>
  15 #include <linux/io.h>
  16 #include <linux/clk.h>
  17 #include <linux/clkdev.h>
  18 #include <linux/of.h>
  19
  20 #include <dt-bindings/clock/pxa-clock.h>
  21 #include "clk-pxa.h"
  22
  23 #define KHz 1000
  24 #define MHz (1000 * 1000)
  25
  26 enum {
  27         PXA_CORE_13Mhz = 0,
  28         PXA_CORE_RUN,
  29         PXA_CORE_TURBO,
  30 };
  31
  32 enum {
  33         PXA_BUS_13Mhz = 0,
  34         PXA_BUS_RUN,
  35 };
  36
  37 enum {
  38         PXA_LCD_13Mhz = 0,
  39         PXA_LCD_RUN,
  40 };
  41
  42 enum {
  43         PXA_MEM_13Mhz = 0,
  44         PXA_MEM_SYSTEM_BUS,
  45         PXA_MEM_RUN,
  46 };
  47
  48 static const char * const get_freq_khz[] = {
  49         "core", "run", "cpll", "memory",
  50         "system_bus"
  51 };
  52
  53 /*
  54  * Get the clock frequency as reflected by CCSR and the turbo flag.
  55  * We assume these values have been applied via a fcs.
  56  * If info is not 0 we also display the current settings.
  57  */
  58 unsigned int pxa27x_get_clk_frequency_khz(int info)
  59 {
  60         struct clk *clk;
  61         unsigned long clks[5];
  62         int i;
  63
  64         for (i = 0; i < 5; i++) {
  65                 clk = clk_get(NULL, get_freq_khz[i]);
  66                 if (IS_ERR(clk)) {
  67                         clks[i] = 0;
  68                 } else {
  69                         clks[i] = clk_get_rate(clk);
  70                         clk_put(clk);
  71                 }
  72         }
  73         if (info) {
  74                 pr_info("Run Mode clock: %ld.%02ldMHz\n",
  75                         clks[1] / 1000000, (clks[1] % 1000000) / 10000);
  76                 pr_info("Turbo Mode clock: %ld.%02ldMHz\n",
  77                         clks[2] / 1000000, (clks[2] % 1000000) / 10000);
  78                 pr_info("Memory clock: %ld.%02ldMHz\n",
  79                         clks[3] / 1000000, (clks[3] % 1000000) / 10000);
  80                 pr_info("System bus clock: %ld.%02ldMHz\n",
  81                         clks[4] / 1000000, (clks[4] % 1000000) / 10000);
  82         }
  83         return (unsigned int)clks[0] / KHz;
  84 }
  85
  86 bool pxa27x_is_ppll_disabled(void)
  87 {
  88         unsigned long ccsr = CCSR;
  89
  90         return ccsr & (1 << CCCR_PPDIS_BIT);
  91 }
  92
  93 #define PXA27X_CKEN(dev_id, con_id, parents, mult_hp, div_hp,           \
  94                     bit, is_lp, flags)                                  \
  95         PXA_CKEN(dev_id, con_id, bit, parents, 1, 1, mult_hp, div_hp,   \
  96                  is_lp,  &CKEN, CKEN_ ## bit, flags)
  97 #define PXA27X_PBUS_CKEN(dev_id, con_id, bit, mult_hp, div_hp, delay)   \
  98         PXA27X_CKEN(dev_id, con_id, pxa27x_pbus_parents, mult_hp,       \
  99                     div_hp, bit, pxa27x_is_ppll_disabled, 0)
 100
 101 PARENTS(pxa27x_pbus) = { "osc_13mhz", "ppll_312mhz" };
 102 PARENTS(pxa27x_sbus) = { "system_bus", "system_bus" };
 103 PARENTS(pxa27x_32Mhz_bus) = { "osc_32_768khz", "osc_32_768khz" };
 104 PARENTS(pxa27x_lcd_bus) = { "lcd_base", "lcd_base" };
 105 PARENTS(pxa27x_membus) = { "lcd_base", "lcd_base" };
 106
 107 #define PXA27X_CKEN_1RATE(dev_id, con_id, bit, parents, delay)          \
 108         PXA_CKEN_1RATE(dev_id, con_id, bit, parents,                    \
 109                        &CKEN, CKEN_ ## bit, 0)
 110 #define PXA27X_CKEN_1RATE_AO(dev_id, con_id, bit, parents, delay)       \
 111         PXA_CKEN_1RATE(dev_id, con_id, bit, parents,                    \
 112                        &CKEN, CKEN_ ## bit, CLK_IGNORE_UNUSED)
 113
 114 static struct desc_clk_cken pxa27x_clocks[] __initdata = {
 115         PXA27X_PBUS_CKEN("pxa2xx-uart.0", NULL, FFUART, 2, 42, 1),
 116         PXA27X_PBUS_CKEN("pxa2xx-uart.1", NULL, BTUART, 2, 42, 1),
 117         PXA27X_PBUS_CKEN("pxa2xx-uart.2", NULL, STUART, 2, 42, 1),
 118         PXA27X_PBUS_CKEN("pxa2xx-i2s", NULL, I2S, 2, 51, 0),
 119         PXA27X_PBUS_CKEN("pxa2xx-i2c.0", NULL, I2C, 2, 19, 0),
 120         PXA27X_PBUS_CKEN("pxa27x-udc", NULL, USB, 2, 13, 5),
 121         PXA27X_PBUS_CKEN("pxa2xx-mci.0", NULL, MMC, 2, 32, 0),
 122         PXA27X_PBUS_CKEN("pxa2xx-ir", "FICPCLK", FICP, 2, 13, 0),
 123         PXA27X_PBUS_CKEN("pxa27x-ohci", NULL, USBHOST, 2, 13, 0),
 124         PXA27X_PBUS_CKEN("pxa2xx-i2c.1", NULL, PWRI2C, 1, 24, 0),
 125         PXA27X_PBUS_CKEN("pxa27x-ssp.0", NULL, SSP1, 1, 24, 0),
 126         PXA27X_PBUS_CKEN("pxa27x-ssp.1", NULL, SSP2, 1, 24, 0),
 127         PXA27X_PBUS_CKEN("pxa27x-ssp.2", NULL, SSP3, 1, 24, 0),
 128         PXA27X_PBUS_CKEN("pxa27x-pwm.0", NULL, PWM0, 1, 24, 0),
 129         PXA27X_PBUS_CKEN("pxa27x-pwm.1", NULL, PWM1, 1, 24, 0),
 130         PXA27X_PBUS_CKEN(NULL, "MSLCLK", MSL, 2, 13, 0),
 131         PXA27X_PBUS_CKEN(NULL, "USIMCLK", USIM, 2, 13, 0),
 132         PXA27X_PBUS_CKEN(NULL, "MSTKCLK", MEMSTK, 2, 32, 0),
 133         PXA27X_PBUS_CKEN(NULL, "AC97CLK", AC97, 1, 1, 0),
 134         PXA27X_PBUS_CKEN(NULL, "AC97CONFCLK", AC97CONF, 1, 1, 0),
 135         PXA27X_PBUS_CKEN(NULL, "OSTIMER0", OSTIMER, 1, 96, 0),
 136
 137         PXA27X_CKEN_1RATE("pxa27x-keypad", NULL, KEYPAD,
 138                           pxa27x_32Mhz_bus_parents, 0),
 139         PXA27X_CKEN_1RATE(NULL, "IMCLK", IM, pxa27x_sbus_parents, 0),
 140         PXA27X_CKEN_1RATE("pxa2xx-fb", NULL, LCD, pxa27x_lcd_bus_parents, 0),
 141         PXA27X_CKEN_1RATE("pxa27x-camera.0", NULL, CAMERA,
 142                           pxa27x_lcd_bus_parents, 0),
 143         PXA27X_CKEN_1RATE_AO("pxa2xx-pcmcia", NULL, MEMC,
 144                              pxa27x_membus_parents, 0),
 145
 146 };
 147
 148 static unsigned long clk_pxa27x_cpll_get_rate(struct clk_hw *hw,
 149         unsigned long parent_rate)
 150 {
 151         unsigned long clkcfg;
 152         unsigned int t, ht;
 153         unsigned int l, L, n2, N;
 154         unsigned long ccsr = CCSR;
 155
 156         asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg));
 157         t  = clkcfg & (1 << 0);
 158         ht = clkcfg & (1 << 2);
 159
 160         l  = ccsr & CCSR_L_MASK;
 161         n2 = (ccsr & CCSR_N2_MASK) >> CCSR_N2_SHIFT;
 162         L  = l * parent_rate;
 163         N  = (L * n2) / 2;
 164
 165         return t ? N : L;
 166 }
 167 PARENTS(clk_pxa27x_cpll) = { "osc_13mhz" };
 168 RATE_RO_OPS(clk_pxa27x_cpll, "cpll");
 169
 170 static unsigned long clk_pxa27x_lcd_base_get_rate(struct clk_hw *hw,
 171                                                   unsigned long parent_rate)
 172 {
 173         unsigned int l, osc_forced;
 174         unsigned long ccsr = CCSR;
 175         unsigned long cccr = CCCR;
 176
 177         l  = ccsr & CCSR_L_MASK;
 178         osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
 179         if (osc_forced) {
 180                 if (cccr & (1 << CCCR_LCD_26_BIT))
 181                         return parent_rate * 2;
 182                 else
 183                         return parent_rate;
 184         }
 185
 186         if (l <= 7)
 187                 return parent_rate;
 188         if (l <= 16)
 189                 return parent_rate / 2;
 190         return parent_rate / 4;
 191 }
 192
 193 static u8 clk_pxa27x_lcd_base_get_parent(struct clk_hw *hw)
 194 {
 195         unsigned int osc_forced;
 196         unsigned long ccsr = CCSR;
 197
 198         osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
 199         if (osc_forced)
 200                 return PXA_LCD_13Mhz;
 201         else
 202                 return PXA_LCD_RUN;
 203 }
 204
 205 PARENTS(clk_pxa27x_lcd_base) = { "osc_13mhz", "run" };
 206 MUX_RO_RATE_RO_OPS(clk_pxa27x_lcd_base, "lcd_base");
 207
 208 static void __init pxa27x_register_plls(void)
 209 {
 210         clk_register_fixed_rate(NULL, "osc_13mhz", NULL,
 211                                 CLK_GET_RATE_NOCACHE | CLK_IS_ROOT,
 212                                 13 * MHz);
 213         clk_register_fixed_rate(NULL, "osc_32_768khz", NULL,
 214                                 CLK_GET_RATE_NOCACHE | CLK_IS_ROOT,
 215                                 32768 * KHz);
 216         clk_register_fixed_rate(NULL, "clk_dummy", NULL, CLK_IS_ROOT, 0);
 217         clk_register_fixed_factor(NULL, "ppll_312mhz", "osc_13mhz", 0, 24, 1);
 218 }
 219
 220 static unsigned long clk_pxa27x_core_get_rate(struct clk_hw *hw,
 221                                               unsigned long parent_rate)
 222 {
 223         unsigned long clkcfg;
 224         unsigned int t, ht, b, osc_forced;
 225         unsigned long ccsr = CCSR;
 226
 227         osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
 228         asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg));
 229         t  = clkcfg & (1 << 0);
 230         ht = clkcfg & (1 << 2);
 231         b  = clkcfg & (1 << 3);
 232
 233         if (osc_forced)
 234                 return parent_rate;
 235         if (ht)
 236                 return parent_rate / 2;
 237         else
 238                 return parent_rate;
 239 }
 240
 241 static u8 clk_pxa27x_core_get_parent(struct clk_hw *hw)
 242 {
 243         unsigned long clkcfg;
 244         unsigned int t, ht, b, osc_forced;
 245         unsigned long ccsr = CCSR;
 246
 247         osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
 248         if (osc_forced)
 249                 return PXA_CORE_13Mhz;
 250
 251         asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg));
 252         t  = clkcfg & (1 << 0);
 253         ht = clkcfg & (1 << 2);
 254         b  = clkcfg & (1 << 3);
 255
 256         if (ht || t)
 257                 return PXA_CORE_TURBO;
 258         return PXA_CORE_RUN;
 259 }
 260 PARENTS(clk_pxa27x_core) = { "osc_13mhz", "run", "cpll" };
 261 MUX_RO_RATE_RO_OPS(clk_pxa27x_core, "core");
 262
 263 static unsigned long clk_pxa27x_run_get_rate(struct clk_hw *hw,
 264                                              unsigned long parent_rate)
 265 {
 266         unsigned long ccsr = CCSR;
 267         unsigned int n2 = (ccsr & CCSR_N2_MASK) >> CCSR_N2_SHIFT;
 268
 269         return (parent_rate / n2) * 2;
 270 }
 271 PARENTS(clk_pxa27x_run) = { "cpll" };
 272 RATE_RO_OPS(clk_pxa27x_run, "run");
 273
 274 static void __init pxa27x_register_core(void)
 275 {
 276         clk_register_clk_pxa27x_cpll();
 277         clk_register_clk_pxa27x_run();
 278
 279         clkdev_pxa_register(CLK_CORE, "core", NULL,
 280                             clk_register_clk_pxa27x_core());
 281 }
 282
 283 static unsigned long clk_pxa27x_system_bus_get_rate(struct clk_hw *hw,
 284                                                     unsigned long parent_rate)
 285 {
 286         unsigned long clkcfg;
 287         unsigned int b, osc_forced;
 288         unsigned long ccsr = CCSR;
 289
 290         osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
 291         asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg));
 292         b  = clkcfg & (1 << 3);
 293
 294         if (osc_forced)
 295                 return parent_rate;
 296         if (b)
 297                 return parent_rate / 2;
 298         else
 299                 return parent_rate;
 300 }
 301
 302 static u8 clk_pxa27x_system_bus_get_parent(struct clk_hw *hw)
 303 {
 304         unsigned int osc_forced;
 305         unsigned long ccsr = CCSR;
 306
 307         osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
 308         if (osc_forced)
 309                 return PXA_BUS_13Mhz;
 310         else
 311                 return PXA_BUS_RUN;
 312 }
 313
 314 PARENTS(clk_pxa27x_system_bus) = { "osc_13mhz", "run" };
 315 MUX_RO_RATE_RO_OPS(clk_pxa27x_system_bus, "system_bus");
 316
 317 static unsigned long clk_pxa27x_memory_get_rate(struct clk_hw *hw,
 318                                                 unsigned long parent_rate)
 319 {
 320         unsigned int a, l, osc_forced;
 321         unsigned long cccr = CCCR;
 322         unsigned long ccsr = CCSR;
 323
 324         osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
 325         a = cccr & (1 << CCCR_A_BIT);
 326         l  = ccsr & CCSR_L_MASK;
 327
 328         if (osc_forced || a)
 329                 return parent_rate;
 330         if (l <= 10)
 331                 return parent_rate;
 332         if (l <= 20)
 333                 return parent_rate / 2;
 334         return parent_rate / 4;
 335 }
 336
 337 static u8 clk_pxa27x_memory_get_parent(struct clk_hw *hw)
 338 {
 339         unsigned int osc_forced, a;
 340         unsigned long cccr = CCCR;
 341         unsigned long ccsr = CCSR;
 342
 343         osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
 344         a = cccr & (1 << CCCR_A_BIT);
 345         if (osc_forced)
 346                 return PXA_MEM_13Mhz;
 347         if (a)
 348                 return PXA_MEM_SYSTEM_BUS;
 349         else
 350                 return PXA_MEM_RUN;
 351 }
 352
 353 PARENTS(clk_pxa27x_memory) = { "osc_13mhz", "system_bus", "run" };
 354 MUX_RO_RATE_RO_OPS(clk_pxa27x_memory, "memory");
 355
 356 #define DUMMY_CLK(_con_id, _dev_id, _parent) \
 357         { .con_id = _con_id, .dev_id = _dev_id, .parent = _parent }
 358 struct dummy_clk {
 359         const char *con_id;
 360         const char *dev_id;
 361         const char *parent;
 362 };
 363 static struct dummy_clk dummy_clks[] __initdata = {
 364         DUMMY_CLK(NULL, "pxa27x-gpio", "osc_32_768khz"),
 365         DUMMY_CLK(NULL, "sa1100-rtc", "osc_32_768khz"),
 366         DUMMY_CLK("UARTCLK", "pxa2xx-ir", "STUART"),
 367 };
 368
 369 static void __init pxa27x_dummy_clocks_init(void)
 370 {
 371         struct clk *clk;
 372         struct dummy_clk *d;
 373         const char *name;
 374         int i;
 375
 376         for (i = 0; i < ARRAY_SIZE(dummy_clks); i++) {
 377                 d = &dummy_clks[i];
 378                 name = d->dev_id ? d->dev_id : d->con_id;
 379                 clk = clk_register_fixed_factor(NULL, name, d->parent, 0, 1, 1);
 380                 clk_register_clkdev(clk, d->con_id, d->dev_id);
 381         }
 382 }
 383
 384 static void __init pxa27x_base_clocks_init(void)
 385 {
 386         pxa27x_register_plls();
 387         pxa27x_register_core();
 388         clk_register_clk_pxa27x_system_bus();
 389         clk_register_clk_pxa27x_memory();
 390         clk_register_clk_pxa27x_lcd_base();
 391 }
 392
 393 int __init pxa27x_clocks_init(void)
 394 {
 395         pxa27x_base_clocks_init();
 396         pxa27x_dummy_clocks_init();
 397         return clk_pxa_cken_init(pxa27x_clocks, ARRAY_SIZE(pxa27x_clocks));
 398 }
 399
 400 static void __init pxa27x_dt_clocks_init(struct device_node *np)
 401 {
 402         pxa27x_clocks_init();
 403         clk_pxa_dt_common_init(np);
 404 }
 405 CLK_OF_DECLARE(pxa_clks, "marvell,pxa270-clocks", pxa27x_dt_clocks_init);