| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Copyright (C) 2014, STMicroelectronics - All Rights Reserved |
| * Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics. |
| */ |
| |
| #include <common.h> |
| #include <asm/io.h> |
| #include <asm/arch-stv0991/hardware.h> |
| #include <asm/arch-stv0991/stv0991_cgu.h> |
| #include <asm/arch-stv0991/stv0991_gpt.h> |
| |
| static struct stv0991_cgu_regs *const stv0991_cgu_regs = \ |
| (struct stv0991_cgu_regs *) (CGU_BASE_ADDR); |
| |
| #define READ_TIMER() (readl(&gpt1_regs_ptr->cnt) & GPT_FREE_RUNNING) |
| #define GPT_RESOLUTION (CONFIG_STV0991_HZ_CLOCK / CONFIG_STV0991_HZ) |
| |
| DECLARE_GLOBAL_DATA_PTR; |
| |
| #define timestamp gd->arch.tbl |
| #define lastdec gd->arch.lastinc |
| |
| int timer_init(void) |
| { |
| /* Timer1 clock configuration */ |
| writel(TIMER1_CLK_CFG, &stv0991_cgu_regs->tim_freq); |
| writel(readl(&stv0991_cgu_regs->cgu_enable_2) | |
| TIMER1_CLK_EN, &stv0991_cgu_regs->cgu_enable_2); |
| |
| /* Stop the timer */ |
| writel(readl(&gpt1_regs_ptr->cr1) & ~GPT_CR1_CEN, &gpt1_regs_ptr->cr1); |
| writel(GPT_PRESCALER_128, &gpt1_regs_ptr->psc); |
| /* Configure timer for auto-reload */ |
| writel(readl(&gpt1_regs_ptr->cr1) | GPT_MODE_AUTO_RELOAD, |
| &gpt1_regs_ptr->cr1); |
| |
| /* load value for free running */ |
| writel(GPT_FREE_RUNNING, &gpt1_regs_ptr->arr); |
| |
| /* start timer */ |
| writel(readl(&gpt1_regs_ptr->cr1) | GPT_CR1_CEN, |
| &gpt1_regs_ptr->cr1); |
| |
| /* 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_STV0991_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) |
| ; |
| } |
| |
| 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; |
| } |
| |
| void udelay_masked(unsigned long usec) |
| { |
| return udelay(usec); |
| } |
| |
| /* |
| * 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_STV0991_HZ; |
| } |