armv7/stv0991/timer.c

1 // SPDX-License-Identifier: GPL-2.0+
3  * Copyright (C) 2014, STMicroelectronics - All Rights Reserved
9 #include <asm/arch-stv0991/hardware.h>
10 #include <asm/arch-stv0991/stv0991_cgu.h>
11 #include <asm/arch-stv0991/stv0991_gpt.h>
16 #define READ_TIMER()	(readl(&gpt1_regs_ptr->cnt) & GPT_FREE_RUNNING)
21 #define timestamp gd->arch.tbl
22 #define lastdec gd->arch.lastinc
29 	writel(TIMER1_CLK_CFG, &stv0991_cgu_regs->tim_freq);  in timer_init()
30 	writel(readl(&stv0991_cgu_regs->cgu_enable_2) |  in timer_init()
31 			TIMER1_CLK_EN, &stv0991_cgu_regs->cgu_enable_2);  in timer_init()
34 	writel(readl(&gpt1_regs_ptr->cr1) & ~GPT_CR1_CEN, &gpt1_regs_ptr->cr1);  in timer_init()
35 	writel(GPT_PRESCALER_128, &gpt1_regs_ptr->psc);  in timer_init()
36 	/* Configure timer for auto-reload */  in timer_init()
37 	writel(readl(&gpt1_regs_ptr->cr1) | GPT_MODE_AUTO_RELOAD,  in timer_init()
38 			&gpt1_regs_ptr->cr1);  in timer_init()
41 	writel(GPT_FREE_RUNNING, &gpt1_regs_ptr->arr);  in timer_init()
44 	writel(readl(&gpt1_regs_ptr->cr1) | GPT_CR1_CEN,  in timer_init()
45 			&gpt1_regs_ptr->cr1);  in timer_init()
59 	return (get_timer_masked() / GPT_RESOLUTION) - base;  in get_timer()
74 	while ((ulong) (get_timer_masked() - start) < tmo)  in __udelay()
84 		timestamp += now - lastdec;  in get_timer_masked()
87 		timestamp += now + GPT_FREE_RUNNING - lastdec;  in get_timer_masked()
95  * This function is derived from PowerPC code (read timebase as long long).
104  * This function is derived from PowerPC code (timebase clock frequency).