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git.ipfire.org Git - thirdparty/u-boot.git/blob - arch/arm/cpu/arm926ejs/spear/timer.c
3 * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
5 * SPDX-License-Identifier: GPL-2.0+
10 #include <asm/arch/hardware.h>
11 #include <asm/arch/spr_gpt.h>
12 #include <asm/arch/spr_misc.h>
14 #define GPT_RESOLUTION (CONFIG_SPEAR_HZ_CLOCK / CONFIG_SPEAR_HZ)
15 #define READ_TIMER() (readl(&gpt_regs_p->count) & GPT_FREE_RUNNING)
17 static struct gpt_regs
*const gpt_regs_p
=
18 (struct gpt_regs
*)CONFIG_SPEAR_TIMERBASE
;
20 static struct misc_regs
*const misc_regs_p
=
21 (struct misc_regs
*)CONFIG_SPEAR_MISCBASE
;
23 DECLARE_GLOBAL_DATA_PTR
;
25 #define timestamp gd->arch.tbl
26 #define lastdec gd->arch.lastinc
32 /* Prescaler setting */
33 #if defined(CONFIG_SPEAR3XX)
34 writel(MISC_PRSC_CFG
, &misc_regs_p
->prsc2_clk_cfg
);
35 synth
= MISC_GPT4SYNTH
;
36 #elif defined(CONFIG_SPEAR600)
37 writel(MISC_PRSC_CFG
, &misc_regs_p
->prsc1_clk_cfg
);
38 synth
= MISC_GPT3SYNTH
;
40 # error Incorrect config. Can only be spear{600|300|310|320}
43 writel(readl(&misc_regs_p
->periph_clk_cfg
) | synth
,
44 &misc_regs_p
->periph_clk_cfg
);
47 writel(GPT_PRESCALER_1
| GPT_MODE_AUTO_RELOAD
, &gpt_regs_p
->control
);
49 /* load value for free running */
50 writel(GPT_FREE_RUNNING
, &gpt_regs_p
->compare
);
52 /* auto reload, start timer */
53 writel(readl(&gpt_regs_p
->control
) | GPT_ENABLE
, &gpt_regs_p
->control
);
56 lastdec
= READ_TIMER();
63 * timer without interrupts
65 ulong
get_timer(ulong base
)
67 return (get_timer_masked() / GPT_RESOLUTION
) - base
;
70 void __udelay(unsigned long usec
)
73 ulong start
= get_timer_masked();
74 ulong tenudelcnt
= CONFIG_SPEAR_HZ_CLOCK
/ (1000 * 100);
77 rndoff
= (usec
% 10) ? 1 : 0;
79 /* tenudelcnt timer tick gives 10 microsecconds delay */
80 tmo
= ((usec
/ 10) + rndoff
) * tenudelcnt
;
82 while ((ulong
) (get_timer_masked() - start
) < tmo
)
86 ulong
get_timer_masked(void)
88 ulong now
= READ_TIMER();
92 timestamp
+= now
- lastdec
;
94 /* we have an overflow ... */
95 timestamp
+= now
+ GPT_FREE_RUNNING
- lastdec
;
102 void udelay_masked(unsigned long usec
)
108 * This function is derived from PowerPC code (read timebase as long long).
109 * On ARM it just returns the timer value.
111 unsigned long long get_ticks(void)
117 * This function is derived from PowerPC code (timebase clock frequency).
118 * On ARM it returns the number of timer ticks per second.
120 ulong
get_tbclk(void)
122 return CONFIG_SPEAR_HZ
;