1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2011 Vladimir Zapolskiy <vz@mleia.com>
4 */
5
6 #include <common.h>
7 #include <asm/arch/cpu.h>
8 #include <asm/arch/clk.h>
9 #include <asm/arch/timer.h>
10 #include <asm/io.h>
11
12 static struct timer_regs *timer0 = (struct timer_regs *)TIMER0_BASE;
13 static struct timer_regs *timer1 = (struct timer_regs *)TIMER1_BASE;
14 static struct clk_pm_regs *clk = (struct clk_pm_regs *)CLK_PM_BASE;
15
lpc32xx_timer_clock(u32 bit,int enable)16 static void lpc32xx_timer_clock(u32 bit, int enable)
17 {
18 if (enable)
19 setbits_le32(&clk->timclk_ctrl1, bit);
20 else
21 clrbits_le32(&clk->timclk_ctrl1, bit);
22 }
23
lpc32xx_timer_reset(struct timer_regs * timer,u32 freq)24 static void lpc32xx_timer_reset(struct timer_regs *timer, u32 freq)
25 {
26 writel(TIMER_TCR_COUNTER_RESET, &timer->tcr);
27 writel(TIMER_TCR_COUNTER_DISABLE, &timer->tcr);
28 writel(0, &timer->tc);
29 writel(0, &timer->pr);
30
31 /* Count mode is every rising PCLK edge */
32 writel(TIMER_CTCR_MODE_TIMER, &timer->ctcr);
33
34 /* Set prescale counter value */
35 writel((get_periph_clk_rate() / freq) - 1, &timer->pr);
36 }
37
lpc32xx_timer_count(struct timer_regs * timer,int enable)38 static void lpc32xx_timer_count(struct timer_regs *timer, int enable)
39 {
40 if (enable)
41 writel(TIMER_TCR_COUNTER_ENABLE, &timer->tcr);
42 else
43 writel(TIMER_TCR_COUNTER_DISABLE, &timer->tcr);
44 }
45
timer_init(void)46 int timer_init(void)
47 {
48 lpc32xx_timer_clock(CLK_TIMCLK_TIMER0, 1);
49 lpc32xx_timer_reset(timer0, CONFIG_SYS_HZ);
50 lpc32xx_timer_count(timer0, 1);
51
52 return 0;
53 }
54
get_timer(ulong base)55 ulong get_timer(ulong base)
56 {
57 return readl(&timer0->tc) - base;
58 }
59
__udelay(unsigned long usec)60 void __udelay(unsigned long usec)
61 {
62 lpc32xx_timer_clock(CLK_TIMCLK_TIMER1, 1);
63 lpc32xx_timer_reset(timer1, CONFIG_SYS_HZ * 1000);
64 lpc32xx_timer_count(timer1, 1);
65
66 while (readl(&timer1->tc) < usec)
67 /* NOP */;
68
69 lpc32xx_timer_count(timer1, 0);
70 lpc32xx_timer_clock(CLK_TIMCLK_TIMER1, 0);
71 }
72
get_ticks(void)73 unsigned long long get_ticks(void)
74 {
75 return get_timer(0);
76 }
77
get_tbclk(void)78 ulong get_tbclk(void)
79 {
80 return CONFIG_SYS_HZ;
81 }
82