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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2009
- * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
- */
- #include <common.h>
- #include <init.h>
- #include <time.h>
- #include <asm/io.h>
- #include <asm/arch/hardware.h>
- #include <asm/arch/spr_gpt.h>
- #include <asm/arch/spr_misc.h>
- #define GPT_RESOLUTION (CONFIG_SPEAR_HZ_CLOCK / CONFIG_SPEAR_HZ)
- #define READ_TIMER() (readl(&gpt_regs_p->count) & GPT_FREE_RUNNING)
- static struct gpt_regs *const gpt_regs_p =
- (struct gpt_regs *)CONFIG_SPEAR_TIMERBASE;
- static struct misc_regs *const misc_regs_p =
- (struct misc_regs *)CONFIG_SPEAR_MISCBASE;
- DECLARE_GLOBAL_DATA_PTR;
- static ulong get_timer_masked(void);
- #define timestamp gd->arch.tbl
- #define lastdec gd->arch.lastinc
- int timer_init(void)
- {
- u32 synth;
- /* Prescaler setting */
- #if defined(CONFIG_SPEAR3XX)
- writel(MISC_PRSC_CFG, &misc_regs_p->prsc2_clk_cfg);
- synth = MISC_GPT4SYNTH;
- #elif defined(CONFIG_SPEAR600)
- writel(MISC_PRSC_CFG, &misc_regs_p->prsc1_clk_cfg);
- synth = MISC_GPT3SYNTH;
- #else
- # error Incorrect config. Can only be SPEAR{600|300|310|320}
- #endif
- writel(readl(&misc_regs_p->periph_clk_cfg) | synth,
- &misc_regs_p->periph_clk_cfg);
- /* disable timers */
- writel(GPT_PRESCALER_1 | GPT_MODE_AUTO_RELOAD, &gpt_regs_p->control);
- /* load value for free running */
- writel(GPT_FREE_RUNNING, &gpt_regs_p->compare);
- /* auto reload, start timer */
- writel(readl(&gpt_regs_p->control) | GPT_ENABLE, &gpt_regs_p->control);
- /* Reset the timer */
- lastdec = READ_TIMER();
- timestamp = 0;
- return 0;
- }
- /*
- * timer without interrupts
- */
- ulong get_timer(ulong base)
- {
- return (get_timer_masked() / GPT_RESOLUTION) - base;
- }
- void __udelay(unsigned long usec)
- {
- ulong tmo;
- ulong start = get_timer_masked();
- ulong tenudelcnt = CONFIG_SPEAR_HZ_CLOCK / (1000 * 100);
- ulong rndoff;
- rndoff = (usec % 10) ? 1 : 0;
- /* tenudelcnt timer tick gives 10 microsecconds delay */
- tmo = ((usec / 10) + rndoff) * tenudelcnt;
- while ((ulong) (get_timer_masked() - start) < tmo)
- ;
- }
- static ulong get_timer_masked(void)
- {
- ulong now = READ_TIMER();
- if (now >= lastdec) {
- /* normal mode */
- timestamp += now - lastdec;
- } else {
- /* we have an overflow ... */
- timestamp += now + GPT_FREE_RUNNING - lastdec;
- }
- lastdec = now;
- return timestamp;
- }
- /*
- * This function is derived from PowerPC code (read timebase as long long).
- * On ARM it just returns the timer value.
- */
- unsigned long long get_ticks(void)
- {
- return get_timer(0);
- }
- /*
- * This function is derived from PowerPC code (timebase clock frequency).
- * On ARM it returns the number of timer ticks per second.
- */
- ulong get_tbclk(void)
- {
- return CONFIG_SPEAR_HZ;
- }
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