1*83d290c5STom Rini // SPDX-License-Identifier: GPL-2.0+ 2a47a12beSStefan Roese /* 3a47a12beSStefan Roese * (C) Copyright 2000, 2001 4a47a12beSStefan Roese * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 5a47a12beSStefan Roese */ 6a47a12beSStefan Roese 7a47a12beSStefan Roese #include <common.h> 8ba3da734SChristophe Leroy #include <asm/io.h> 9a47a12beSStefan Roese 10a47a12beSStefan Roese /* ------------------------------------------------------------------------- */ 11a47a12beSStefan Roese 12a47a12beSStefan Roese /* 13a47a12beSStefan Roese * This function is intended for SHORT delays only. 14a47a12beSStefan Roese * It will overflow at around 10 seconds @ 400MHz, 15a47a12beSStefan Roese * or 20 seconds @ 200MHz. 16a47a12beSStefan Roese */ usec2ticks(unsigned long usec)17a47a12beSStefan Roeseunsigned long usec2ticks(unsigned long usec) 18a47a12beSStefan Roese { 19a47a12beSStefan Roese ulong ticks; 20a47a12beSStefan Roese 21a47a12beSStefan Roese if (usec < 1000) { 22a47a12beSStefan Roese ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000; 23a47a12beSStefan Roese } else { 24a47a12beSStefan Roese ticks = ((usec / 10) * (get_tbclk() / 100000)); 25a47a12beSStefan Roese } 26a47a12beSStefan Roese 27a47a12beSStefan Roese return (ticks); 28a47a12beSStefan Roese } 29a47a12beSStefan Roese 30a47a12beSStefan Roese /* ------------------------------------------------------------------------- */ 31a47a12beSStefan Roese 32a47a12beSStefan Roese /* 33a47a12beSStefan Roese * We implement the delay by converting the delay (the number of 34a47a12beSStefan Roese * microseconds to wait) into a number of time base ticks; then we 35a47a12beSStefan Roese * watch the time base until it has incremented by that amount. 36a47a12beSStefan Roese */ __udelay(unsigned long usec)37a47a12beSStefan Roesevoid __udelay(unsigned long usec) 38a47a12beSStefan Roese { 39a47a12beSStefan Roese ulong ticks = usec2ticks (usec); 40a47a12beSStefan Roese wait_ticks (ticks); 41a47a12beSStefan Roese } 42a47a12beSStefan Roese 43a47a12beSStefan Roese /* ------------------------------------------------------------------------- */ 44a47a12beSStefan Roese #ifndef CONFIG_NAND_SPL ticks2usec(unsigned long ticks)45a47a12beSStefan Roeseunsigned long ticks2usec(unsigned long ticks) 46a47a12beSStefan Roese { 47a47a12beSStefan Roese ulong tbclk = get_tbclk(); 48a47a12beSStefan Roese 49a47a12beSStefan Roese /* usec = ticks * 1000000 / tbclk 50a47a12beSStefan Roese * Multiplication would overflow at ~4.2e3 ticks, 51a47a12beSStefan Roese * so we break it up into 52a47a12beSStefan Roese * usec = ( ( ticks * 1000) / tbclk ) * 1000; 53a47a12beSStefan Roese */ 54a47a12beSStefan Roese ticks *= 1000L; 55a47a12beSStefan Roese ticks /= tbclk; 56a47a12beSStefan Roese ticks *= 1000L; 57a47a12beSStefan Roese 58a47a12beSStefan Roese return ((ulong)ticks); 59a47a12beSStefan Roese } 60a47a12beSStefan Roese #endif 61a47a12beSStefan Roese /* ------------------------------------------------------------------------- */ 62a47a12beSStefan Roese timer_init(void)6370e2aaf3SSimon Glassint timer_init(void) 64a47a12beSStefan Roese { 6596805a52STimur Tabi unsigned long temp; 6696805a52STimur Tabi 67a47a12beSStefan Roese /* reset */ 68f0eda3cbSChristophe Leroy asm volatile("li %0,0 ; mttbl %0 ; mttbu %0;" 6996805a52STimur Tabi : "=&r"(temp) ); 70a47a12beSStefan Roese 71a47a12beSStefan Roese return (0); 72a47a12beSStefan Roese } 73a47a12beSStefan Roese /* ------------------------------------------------------------------------- */ 74