1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 /* Tegra clock control functions */ 8 9 #ifndef _TEGRA_CLOCK_H_ 10 #define _TEGRA_CLOCK_H_ 11 12 /* Set of oscillator frequencies supported in the internal API. */ 13 enum clock_osc_freq { 14 /* All in MHz, so 13_0 is 13.0MHz */ 15 CLOCK_OSC_FREQ_13_0, 16 CLOCK_OSC_FREQ_19_2, 17 CLOCK_OSC_FREQ_12_0, 18 CLOCK_OSC_FREQ_26_0, 19 20 CLOCK_OSC_FREQ_COUNT, 21 }; 22 23 #include <asm/arch/clock-tables.h> 24 /* PLL stabilization delay in usec */ 25 #define CLOCK_PLL_STABLE_DELAY_US 300 26 27 /* return the current oscillator clock frequency */ 28 enum clock_osc_freq clock_get_osc_freq(void); 29 30 /** 31 * Start PLL using the provided configuration parameters. 32 * 33 * @param id clock id 34 * @param divm input divider 35 * @param divn feedback divider 36 * @param divp post divider 2^n 37 * @param cpcon charge pump setup control 38 * @param lfcon loop filter setup control 39 * 40 * @returns monotonic time in us that the PLL will be stable 41 */ 42 unsigned long clock_start_pll(enum clock_id id, u32 divm, u32 divn, 43 u32 divp, u32 cpcon, u32 lfcon); 44 45 /** 46 * Set PLL output frequency 47 * 48 * @param clkid clock id 49 * @param pllout pll output id 50 * @param rate desired output rate 51 * 52 * @return 0 if ok, -1 on error (invalid clock id or no suitable divider) 53 */ 54 int clock_set_pllout(enum clock_id clkid, enum pll_out_id pllout, 55 unsigned rate); 56 57 /** 58 * Read low-level parameters of a PLL. 59 * 60 * @param id clock id to read (note: USB is not supported) 61 * @param divm returns input divider 62 * @param divn returns feedback divider 63 * @param divp returns post divider 2^n 64 * @param cpcon returns charge pump setup control 65 * @param lfcon returns loop filter setup control 66 * 67 * @returns 0 if ok, -1 on error (invalid clock id) 68 */ 69 int clock_ll_read_pll(enum clock_id clkid, u32 *divm, u32 *divn, 70 u32 *divp, u32 *cpcon, u32 *lfcon); 71 72 /* 73 * Enable a clock 74 * 75 * @param id clock id 76 */ 77 void clock_enable(enum periph_id clkid); 78 79 /* 80 * Disable a clock 81 * 82 * @param id clock id 83 */ 84 void clock_disable(enum periph_id clkid); 85 86 /* 87 * Set whether a clock is enabled or disabled. 88 * 89 * @param id clock id 90 * @param enable 1 to enable, 0 to disable 91 */ 92 void clock_set_enable(enum periph_id clkid, int enable); 93 94 /** 95 * Reset a peripheral. This puts it in reset, waits for a delay, then takes 96 * it out of reset and waits for th delay again. 97 * 98 * @param periph_id peripheral to reset 99 * @param us_delay time to delay in microseconds 100 */ 101 void reset_periph(enum periph_id periph_id, int us_delay); 102 103 /** 104 * Put a peripheral into or out of reset. 105 * 106 * @param periph_id peripheral to reset 107 * @param enable 1 to put into reset, 0 to take out of reset 108 */ 109 void reset_set_enable(enum periph_id periph_id, int enable); 110 111 112 /* CLK_RST_CONTROLLER_RST_CPU_CMPLX_SET/CLR_0 */ 113 enum crc_reset_id { 114 /* Things we can hold in reset for each CPU */ 115 crc_rst_cpu = 1, 116 crc_rst_de = 1 << 4, /* What is de? */ 117 crc_rst_watchdog = 1 << 8, 118 crc_rst_debug = 1 << 12, 119 }; 120 121 /** 122 * Put parts of the CPU complex into or out of reset.\ 123 * 124 * @param cpu cpu number (0 or 1 on Tegra2, 0-3 on Tegra3) 125 * @param which which parts of the complex to affect (OR of crc_reset_id) 126 * @param reset 1 to assert reset, 0 to de-assert 127 */ 128 void reset_cmplx_set_enable(int cpu, int which, int reset); 129 130 /** 131 * Set the source for a peripheral clock. This plus the divisor sets the 132 * clock rate. You need to look up the datasheet to see the meaning of the 133 * source parameter as it changes for each peripheral. 134 * 135 * Warning: This function is only for use pre-relocation. Please use 136 * clock_start_periph_pll() instead. 137 * 138 * @param periph_id peripheral to adjust 139 * @param source source clock (0, 1, 2 or 3) 140 */ 141 void clock_ll_set_source(enum periph_id periph_id, unsigned source); 142 143 /** 144 * Set the source and divisor for a peripheral clock. This sets the 145 * clock rate. You need to look up the datasheet to see the meaning of the 146 * source parameter as it changes for each peripheral. 147 * 148 * Warning: This function is only for use pre-relocation. Please use 149 * clock_start_periph_pll() instead. 150 * 151 * @param periph_id peripheral to adjust 152 * @param source source clock (0, 1, 2 or 3) 153 * @param divisor divisor value to use 154 */ 155 void clock_ll_set_source_divisor(enum periph_id periph_id, unsigned source, 156 unsigned divisor); 157 158 /** 159 * Start a peripheral PLL clock at the given rate. This also resets the 160 * peripheral. 161 * 162 * @param periph_id peripheral to start 163 * @param parent PLL id of required parent clock 164 * @param rate Required clock rate in Hz 165 * @return rate selected in Hz, or -1U if something went wrong 166 */ 167 unsigned clock_start_periph_pll(enum periph_id periph_id, 168 enum clock_id parent, unsigned rate); 169 170 /** 171 * Returns the rate of a peripheral clock in Hz. Since the caller almost 172 * certainly knows the parent clock (having just set it) we require that 173 * this be passed in so we don't need to work it out. 174 * 175 * @param periph_id peripheral to start 176 * @param parent PLL id of parent clock (used to calculate rate, you 177 * must know this!) 178 * @return clock rate of peripheral in Hz 179 */ 180 unsigned long clock_get_periph_rate(enum periph_id periph_id, 181 enum clock_id parent); 182 183 /** 184 * Adjust peripheral PLL clock to the given rate. This does not reset the 185 * peripheral. If a second stage divisor is not available, pass NULL for 186 * extra_div. If it is available, then this parameter will return the 187 * divisor selected (which will be a power of 2 from 1 to 256). 188 * 189 * @param periph_id peripheral to start 190 * @param parent PLL id of required parent clock 191 * @param rate Required clock rate in Hz 192 * @param extra_div value for the second-stage divisor (NULL if one is 193 not available) 194 * @return rate selected in Hz, or -1U if something went wrong 195 */ 196 unsigned clock_adjust_periph_pll_div(enum periph_id periph_id, 197 enum clock_id parent, unsigned rate, int *extra_div); 198 199 /** 200 * Returns the clock rate of a specified clock, in Hz. 201 * 202 * @param parent PLL id of clock to check 203 * @return rate of clock in Hz 204 */ 205 unsigned clock_get_rate(enum clock_id clkid); 206 207 /** 208 * Start up a UART using low-level calls 209 * 210 * Prior to relocation clock_start_periph_pll() cannot be called. This 211 * function provides a way to set up a UART using low-level calls which 212 * do not require BSS. 213 * 214 * @param periph_id Peripheral ID of UART to enable (e,g, PERIPH_ID_UART1) 215 */ 216 void clock_ll_start_uart(enum periph_id periph_id); 217 218 /** 219 * Decode a peripheral ID from a device tree node. 220 * 221 * This works by looking up the peripheral's 'clocks' node and reading out 222 * the second cell, which is the clock number / peripheral ID. 223 * 224 * @param blob FDT blob to use 225 * @param node Node to look at 226 * @return peripheral ID, or PERIPH_ID_NONE if none 227 */ 228 enum periph_id clock_decode_periph_id(const void *blob, int node); 229 230 /** 231 * Checks if the oscillator bypass is enabled (XOBP bit) 232 * 233 * @return 1 if bypass is enabled, 0 if not 234 */ 235 int clock_get_osc_bypass(void); 236 237 /* 238 * Checks that clocks are valid and prints a warning if not 239 * 240 * @return 0 if ok, -1 on error 241 */ 242 int clock_verify(void); 243 244 /* Initialize the clocks */ 245 void clock_init(void); 246 247 /* Initialize the PLLs */ 248 void clock_early_init(void); 249 250 /* Returns a pointer to the clock source register for a peripheral */ 251 u32 *get_periph_source_reg(enum periph_id periph_id); 252 253 /** 254 * Given a peripheral ID and the required source clock, this returns which 255 * value should be programmed into the source mux for that peripheral. 256 * 257 * There is special code here to handle the one source type with 5 sources. 258 * 259 * @param periph_id peripheral to start 260 * @param source PLL id of required parent clock 261 * @param mux_bits Set to number of bits in mux register: 2 or 4 262 * @param divider_bits Set to number of divider bits (8 or 16) 263 * @return mux value (0-4, or -1 if not found) 264 */ 265 int get_periph_clock_source(enum periph_id periph_id, 266 enum clock_id parent, int *mux_bits, int *divider_bits); 267 268 /* 269 * Convert a device tree clock ID to our peripheral ID. They are mostly 270 * the same but we are very cautious so we check that a valid clock ID is 271 * provided. 272 * 273 * @param clk_id Clock ID according to tegra30 device tree binding 274 * @return peripheral ID, or PERIPH_ID_NONE if the clock ID is invalid 275 */ 276 enum periph_id clk_id_to_periph_id(int clk_id); 277 278 /** 279 * Set the output frequency you want for each PLL clock. 280 * PLL output frequencies are programmed by setting their N, M and P values. 281 * The governing equations are: 282 * VCO = (Fi / m) * n, Fo = VCO / (2^p) 283 * where Fo is the output frequency from the PLL. 284 * Example: Set the output frequency to 216Mhz(Fo) with 12Mhz OSC(Fi) 285 * 216Mhz = ((12Mhz / m) * n) / (2^p) so n=432,m=12,p=1 286 * Please see Tegra TRM section 5.3 to get the detail for PLL Programming 287 * 288 * @param n PLL feedback divider(DIVN) 289 * @param m PLL input divider(DIVN) 290 * @param p post divider(DIVP) 291 * @param cpcon base PLL charge pump(CPCON) 292 * @return 0 if ok, -1 on error (the requested PLL is incorrect and cannot 293 * be overriden), 1 if PLL is already correct 294 */ 295 int clock_set_rate(enum clock_id clkid, u32 n, u32 m, u32 p, u32 cpcon); 296 297 /* return 1 if a peripheral ID is in range */ 298 #define clock_type_id_isvalid(id) ((id) >= 0 && \ 299 (id) < CLOCK_TYPE_COUNT) 300 301 /* return 1 if a periphc_internal_id is in range */ 302 #define periphc_internal_id_isvalid(id) ((id) >= 0 && \ 303 (id) < PERIPHC_COUNT) 304 305 /* SoC-specific TSC init */ 306 void arch_timer_init(void); 307 308 #endif /* _TEGRA_CLOCK_H_ */ 309