1 /* 2 * Marvell PXA3xxx family clocks 3 * 4 * Copyright (C) 2014 Robert Jarzmik 5 * 6 * Heavily inspired from former arch/arm/mach-pxa/pxa3xx.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 * For non-devicetree platforms. Once pxa is fully converted to devicetree, this 13 * should go away. 14 */ 15 #include <linux/io.h> 16 #include <linux/clk.h> 17 #include <linux/clk-provider.h> 18 #include <linux/clkdev.h> 19 #include <linux/of.h> 20 #include <mach/smemc.h> 21 #include <mach/pxa3xx-regs.h> 22 23 #include <dt-bindings/clock/pxa-clock.h> 24 #include "clk-pxa.h" 25 26 #define KHz 1000 27 #define MHz (1000 * 1000) 28 29 enum { 30 PXA_CORE_60Mhz = 0, 31 PXA_CORE_RUN, 32 PXA_CORE_TURBO, 33 }; 34 35 enum { 36 PXA_BUS_60Mhz = 0, 37 PXA_BUS_HSS, 38 }; 39 40 /* crystal frequency to HSIO bus frequency multiplier (HSS) */ 41 static unsigned char hss_mult[4] = { 8, 12, 16, 24 }; 42 43 /* crystal frequency to static memory controller multiplier (SMCFS) */ 44 static unsigned int smcfs_mult[8] = { 6, 0, 8, 0, 0, 16, }; 45 static unsigned int df_clkdiv[4] = { 1, 2, 4, 1 }; 46 47 static const char * const get_freq_khz[] = { 48 "core", "ring_osc_60mhz", "run", "cpll", "system_bus" 49 }; 50 51 /* 52 * Get the clock frequency as reflected by ACSR and the turbo flag. 53 * We assume these values have been applied via a fcs. 54 * If info is not 0 we also display the current settings. 55 */ 56 unsigned int pxa3xx_get_clk_frequency_khz(int info) 57 { 58 struct clk *clk; 59 unsigned long clks[5]; 60 int i; 61 62 for (i = 0; i < 5; i++) { 63 clk = clk_get(NULL, get_freq_khz[i]); 64 if (IS_ERR(clk)) { 65 clks[i] = 0; 66 } else { 67 clks[i] = clk_get_rate(clk); 68 clk_put(clk); 69 } 70 } 71 if (info) { 72 pr_info("RO Mode clock: %ld.%02ldMHz\n", 73 clks[1] / 1000000, (clks[0] % 1000000) / 10000); 74 pr_info("Run Mode clock: %ld.%02ldMHz\n", 75 clks[2] / 1000000, (clks[1] % 1000000) / 10000); 76 pr_info("Turbo Mode clock: %ld.%02ldMHz\n", 77 clks[3] / 1000000, (clks[2] % 1000000) / 10000); 78 pr_info("System bus clock: %ld.%02ldMHz\n", 79 clks[4] / 1000000, (clks[4] % 1000000) / 10000); 80 } 81 return (unsigned int)clks[0] / KHz; 82 } 83 84 static unsigned long clk_pxa3xx_ac97_get_rate(struct clk_hw *hw, 85 unsigned long parent_rate) 86 { 87 unsigned long ac97_div, rate; 88 89 ac97_div = AC97_DIV; 90 91 /* This may loose precision for some rates but won't for the 92 * standard 24.576MHz. 93 */ 94 rate = parent_rate / 2; 95 rate /= ((ac97_div >> 12) & 0x7fff); 96 rate *= (ac97_div & 0xfff); 97 98 return rate; 99 } 100 PARENTS(clk_pxa3xx_ac97) = { "spll_624mhz" }; 101 RATE_RO_OPS(clk_pxa3xx_ac97, "ac97"); 102 103 static unsigned long clk_pxa3xx_smemc_get_rate(struct clk_hw *hw, 104 unsigned long parent_rate) 105 { 106 unsigned long acsr = ACSR; 107 unsigned long memclkcfg = __raw_readl(MEMCLKCFG); 108 109 return (parent_rate / 48) * smcfs_mult[(acsr >> 23) & 0x7] / 110 df_clkdiv[(memclkcfg >> 16) & 0x3]; 111 } 112 PARENTS(clk_pxa3xx_smemc) = { "spll_624mhz" }; 113 RATE_RO_OPS(clk_pxa3xx_smemc, "smemc"); 114 115 static bool pxa3xx_is_ring_osc_forced(void) 116 { 117 unsigned long acsr = ACSR; 118 119 return acsr & ACCR_D0CS; 120 } 121 122 PARENTS(pxa3xx_pbus) = { "ring_osc_60mhz", "spll_624mhz" }; 123 PARENTS(pxa3xx_32Khz_bus) = { "osc_32_768khz", "osc_32_768khz" }; 124 PARENTS(pxa3xx_13MHz_bus) = { "osc_13mhz", "osc_13mhz" }; 125 PARENTS(pxa3xx_ac97_bus) = { "ring_osc_60mhz", "ac97" }; 126 PARENTS(pxa3xx_sbus) = { "ring_osc_60mhz", "system_bus" }; 127 PARENTS(pxa3xx_smemcbus) = { "ring_osc_60mhz", "smemc" }; 128 129 #define CKEN_AB(bit) ((CKEN_ ## bit > 31) ? &CKENB : &CKENA) 130 #define PXA3XX_CKEN(dev_id, con_id, parents, mult_lp, div_lp, mult_hp, \ 131 div_hp, bit, is_lp, flags) \ 132 PXA_CKEN(dev_id, con_id, bit, parents, mult_lp, div_lp, \ 133 mult_hp, div_hp, is_lp, CKEN_AB(bit), \ 134 (CKEN_ ## bit % 32), flags) 135 #define PXA3XX_PBUS_CKEN(dev_id, con_id, bit, mult_lp, div_lp, \ 136 mult_hp, div_hp, delay) \ 137 PXA3XX_CKEN(dev_id, con_id, pxa3xx_pbus_parents, mult_lp, \ 138 div_lp, mult_hp, div_hp, bit, pxa3xx_is_ring_osc_forced, 0) 139 #define PXA3XX_CKEN_1RATE(dev_id, con_id, bit, parents) \ 140 PXA_CKEN_1RATE(dev_id, con_id, bit, parents, \ 141 CKEN_AB(bit), (CKEN_ ## bit % 32), 0) 142 143 static struct desc_clk_cken pxa3xx_clocks[] __initdata = { 144 PXA3XX_PBUS_CKEN("pxa2xx-uart.0", NULL, FFUART, 1, 4, 1, 42, 1), 145 PXA3XX_PBUS_CKEN("pxa2xx-uart.1", NULL, BTUART, 1, 4, 1, 42, 1), 146 PXA3XX_PBUS_CKEN("pxa2xx-uart.2", NULL, STUART, 1, 4, 1, 42, 1), 147 PXA3XX_PBUS_CKEN("pxa2xx-i2c.0", NULL, I2C, 2, 5, 1, 19, 0), 148 PXA3XX_PBUS_CKEN("pxa27x-udc", NULL, UDC, 1, 4, 1, 13, 5), 149 PXA3XX_PBUS_CKEN("pxa27x-ohci", NULL, USBH, 1, 4, 1, 13, 0), 150 PXA3XX_PBUS_CKEN("pxa3xx-u2d", NULL, USB2, 1, 4, 1, 13, 0), 151 PXA3XX_PBUS_CKEN("pxa27x-pwm.0", NULL, PWM0, 1, 6, 1, 48, 0), 152 PXA3XX_PBUS_CKEN("pxa27x-pwm.1", NULL, PWM1, 1, 6, 1, 48, 0), 153 PXA3XX_PBUS_CKEN("pxa2xx-mci.0", NULL, MMC1, 1, 4, 1, 24, 0), 154 PXA3XX_PBUS_CKEN("pxa2xx-mci.1", NULL, MMC2, 1, 4, 1, 24, 0), 155 PXA3XX_PBUS_CKEN("pxa2xx-mci.2", NULL, MMC3, 1, 4, 1, 24, 0), 156 157 PXA3XX_CKEN_1RATE("pxa27x-keypad", NULL, KEYPAD, 158 pxa3xx_32Khz_bus_parents), 159 PXA3XX_CKEN_1RATE("pxa3xx-ssp.0", NULL, SSP1, pxa3xx_13MHz_bus_parents), 160 PXA3XX_CKEN_1RATE("pxa3xx-ssp.1", NULL, SSP2, pxa3xx_13MHz_bus_parents), 161 PXA3XX_CKEN_1RATE("pxa3xx-ssp.2", NULL, SSP3, pxa3xx_13MHz_bus_parents), 162 PXA3XX_CKEN_1RATE("pxa3xx-ssp.3", NULL, SSP4, pxa3xx_13MHz_bus_parents), 163 164 PXA3XX_CKEN(NULL, "AC97CLK", pxa3xx_ac97_bus_parents, 1, 4, 1, 1, AC97, 165 pxa3xx_is_ring_osc_forced, 0), 166 PXA3XX_CKEN(NULL, "CAMCLK", pxa3xx_sbus_parents, 1, 2, 1, 1, CAMERA, 167 pxa3xx_is_ring_osc_forced, 0), 168 PXA3XX_CKEN("pxa2xx-fb", NULL, pxa3xx_sbus_parents, 1, 1, 1, 1, LCD, 169 pxa3xx_is_ring_osc_forced, 0), 170 PXA3XX_CKEN("pxa2xx-pcmcia", NULL, pxa3xx_smemcbus_parents, 1, 4, 171 1, 1, SMC, pxa3xx_is_ring_osc_forced, CLK_IGNORE_UNUSED), 172 }; 173 174 static struct desc_clk_cken pxa300_310_clocks[] __initdata = { 175 176 PXA3XX_PBUS_CKEN("pxa3xx-gcu", NULL, PXA300_GCU, 1, 1, 1, 1, 0), 177 PXA3XX_PBUS_CKEN("pxa3xx-nand", NULL, NAND, 1, 2, 1, 4, 0), 178 PXA3XX_CKEN_1RATE("pxa3xx-gpio", NULL, GPIO, pxa3xx_13MHz_bus_parents), 179 }; 180 181 static struct desc_clk_cken pxa320_clocks[] __initdata = { 182 PXA3XX_PBUS_CKEN("pxa3xx-nand", NULL, NAND, 1, 2, 1, 6, 0), 183 PXA3XX_PBUS_CKEN("pxa3xx-gcu", NULL, PXA320_GCU, 1, 1, 1, 1, 0), 184 PXA3XX_CKEN_1RATE("pxa3xx-gpio", NULL, GPIO, pxa3xx_13MHz_bus_parents), 185 }; 186 187 static struct desc_clk_cken pxa93x_clocks[] __initdata = { 188 189 PXA3XX_PBUS_CKEN("pxa3xx-gcu", NULL, PXA300_GCU, 1, 1, 1, 1, 0), 190 PXA3XX_PBUS_CKEN("pxa3xx-nand", NULL, NAND, 1, 2, 1, 4, 0), 191 PXA3XX_CKEN_1RATE("pxa93x-gpio", NULL, GPIO, pxa3xx_13MHz_bus_parents), 192 }; 193 194 static unsigned long clk_pxa3xx_system_bus_get_rate(struct clk_hw *hw, 195 unsigned long parent_rate) 196 { 197 unsigned long acsr = ACSR; 198 unsigned int hss = (acsr >> 14) & 0x3; 199 200 if (pxa3xx_is_ring_osc_forced()) 201 return parent_rate; 202 return parent_rate / 48 * hss_mult[hss]; 203 } 204 205 static u8 clk_pxa3xx_system_bus_get_parent(struct clk_hw *hw) 206 { 207 if (pxa3xx_is_ring_osc_forced()) 208 return PXA_BUS_60Mhz; 209 else 210 return PXA_BUS_HSS; 211 } 212 213 PARENTS(clk_pxa3xx_system_bus) = { "ring_osc_60mhz", "spll_624mhz" }; 214 MUX_RO_RATE_RO_OPS(clk_pxa3xx_system_bus, "system_bus"); 215 216 static unsigned long clk_pxa3xx_core_get_rate(struct clk_hw *hw, 217 unsigned long parent_rate) 218 { 219 return parent_rate; 220 } 221 222 static u8 clk_pxa3xx_core_get_parent(struct clk_hw *hw) 223 { 224 unsigned long xclkcfg; 225 unsigned int t; 226 227 if (pxa3xx_is_ring_osc_forced()) 228 return PXA_CORE_60Mhz; 229 230 /* Read XCLKCFG register turbo bit */ 231 __asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg)); 232 t = xclkcfg & 0x1; 233 234 if (t) 235 return PXA_CORE_TURBO; 236 return PXA_CORE_RUN; 237 } 238 PARENTS(clk_pxa3xx_core) = { "ring_osc_60mhz", "run", "cpll" }; 239 MUX_RO_RATE_RO_OPS(clk_pxa3xx_core, "core"); 240 241 static unsigned long clk_pxa3xx_run_get_rate(struct clk_hw *hw, 242 unsigned long parent_rate) 243 { 244 unsigned long acsr = ACSR; 245 unsigned int xn = (acsr & ACCR_XN_MASK) >> 8; 246 unsigned int t, xclkcfg; 247 248 /* Read XCLKCFG register turbo bit */ 249 __asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg)); 250 t = xclkcfg & 0x1; 251 252 return t ? (parent_rate / xn) * 2 : parent_rate; 253 } 254 PARENTS(clk_pxa3xx_run) = { "cpll" }; 255 RATE_RO_OPS(clk_pxa3xx_run, "run"); 256 257 static unsigned long clk_pxa3xx_cpll_get_rate(struct clk_hw *hw, 258 unsigned long parent_rate) 259 { 260 unsigned long acsr = ACSR; 261 unsigned int xn = (acsr & ACCR_XN_MASK) >> 8; 262 unsigned int xl = acsr & ACCR_XL_MASK; 263 unsigned int t, xclkcfg; 264 265 /* Read XCLKCFG register turbo bit */ 266 __asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg)); 267 t = xclkcfg & 0x1; 268 269 pr_info("RJK: parent_rate=%lu, xl=%u, xn=%u\n", parent_rate, xl, xn); 270 return t ? parent_rate * xl * xn : parent_rate * xl; 271 } 272 PARENTS(clk_pxa3xx_cpll) = { "osc_13mhz" }; 273 RATE_RO_OPS(clk_pxa3xx_cpll, "cpll"); 274 275 static void __init pxa3xx_register_core(void) 276 { 277 clk_register_clk_pxa3xx_cpll(); 278 clk_register_clk_pxa3xx_run(); 279 280 clkdev_pxa_register(CLK_CORE, "core", NULL, 281 clk_register_clk_pxa3xx_core()); 282 } 283 284 static void __init pxa3xx_register_plls(void) 285 { 286 clk_register_fixed_rate(NULL, "osc_13mhz", NULL, 287 CLK_GET_RATE_NOCACHE, 288 13 * MHz); 289 clkdev_pxa_register(CLK_OSC32k768, "osc_32_768khz", NULL, 290 clk_register_fixed_rate(NULL, "osc_32_768khz", NULL, 291 CLK_GET_RATE_NOCACHE, 292 32768)); 293 clk_register_fixed_rate(NULL, "ring_osc_120mhz", NULL, 294 CLK_GET_RATE_NOCACHE, 295 120 * MHz); 296 clk_register_fixed_rate(NULL, "clk_dummy", NULL, 0, 0); 297 clk_register_fixed_factor(NULL, "spll_624mhz", "osc_13mhz", 0, 48, 1); 298 clk_register_fixed_factor(NULL, "ring_osc_60mhz", "ring_osc_120mhz", 299 0, 1, 2); 300 } 301 302 #define DUMMY_CLK(_con_id, _dev_id, _parent) \ 303 { .con_id = _con_id, .dev_id = _dev_id, .parent = _parent } 304 struct dummy_clk { 305 const char *con_id; 306 const char *dev_id; 307 const char *parent; 308 }; 309 static struct dummy_clk dummy_clks[] __initdata = { 310 DUMMY_CLK(NULL, "pxa93x-gpio", "osc_13mhz"), 311 DUMMY_CLK(NULL, "sa1100-rtc", "osc_32_768khz"), 312 DUMMY_CLK("UARTCLK", "pxa2xx-ir", "STUART"), 313 DUMMY_CLK(NULL, "pxa3xx-pwri2c.1", "osc_13mhz"), 314 }; 315 316 static void __init pxa3xx_dummy_clocks_init(void) 317 { 318 struct clk *clk; 319 struct dummy_clk *d; 320 const char *name; 321 int i; 322 323 for (i = 0; i < ARRAY_SIZE(dummy_clks); i++) { 324 d = &dummy_clks[i]; 325 name = d->dev_id ? d->dev_id : d->con_id; 326 clk = clk_register_fixed_factor(NULL, name, d->parent, 0, 1, 1); 327 clk_register_clkdev(clk, d->con_id, d->dev_id); 328 } 329 } 330 331 static void __init pxa3xx_base_clocks_init(void) 332 { 333 struct clk *clk; 334 335 pxa3xx_register_plls(); 336 pxa3xx_register_core(); 337 clk_register_clk_pxa3xx_system_bus(); 338 clk_register_clk_pxa3xx_ac97(); 339 clk_register_clk_pxa3xx_smemc(); 340 clk = clk_register_gate(NULL, "CLK_POUT", 341 "osc_13mhz", 0, OSCC, 11, 0, NULL); 342 clk_register_clkdev(clk, "CLK_POUT", NULL); 343 clkdev_pxa_register(CLK_OSTIMER, "OSTIMER0", NULL, 344 clk_register_fixed_factor(NULL, "os-timer0", 345 "osc_13mhz", 0, 1, 4)); 346 } 347 348 int __init pxa3xx_clocks_init(void) 349 { 350 int ret; 351 352 pxa3xx_base_clocks_init(); 353 pxa3xx_dummy_clocks_init(); 354 ret = clk_pxa_cken_init(pxa3xx_clocks, ARRAY_SIZE(pxa3xx_clocks)); 355 if (ret) 356 return ret; 357 if (cpu_is_pxa320()) 358 return clk_pxa_cken_init(pxa320_clocks, 359 ARRAY_SIZE(pxa320_clocks)); 360 if (cpu_is_pxa300() || cpu_is_pxa310()) 361 return clk_pxa_cken_init(pxa300_310_clocks, 362 ARRAY_SIZE(pxa300_310_clocks)); 363 return clk_pxa_cken_init(pxa93x_clocks, ARRAY_SIZE(pxa93x_clocks)); 364 } 365 366 static void __init pxa3xx_dt_clocks_init(struct device_node *np) 367 { 368 pxa3xx_clocks_init(); 369 clk_pxa_dt_common_init(np); 370 } 371 CLK_OF_DECLARE(pxa_clks, "marvell,pxa300-clocks", pxa3xx_dt_clocks_init); 372