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81c0ebf6 VK |
1 | /* |
2 | * (C) Copyright 2009 | |
3 | * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com. | |
4 | * | |
5 | * See file CREDITS for list of people who contributed to this | |
6 | * project. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation; either version 2 of | |
11 | * the License, or (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
21 | * MA 02111-1307 USA | |
22 | */ | |
23 | ||
24 | #include <common.h> | |
25 | #include <asm/io.h> | |
26 | #include <asm/arch/hardware.h> | |
27 | #include <asm/arch/spr_gpt.h> | |
28 | #include <asm/arch/spr_misc.h> | |
29 | ||
30 | #define GPT_RESOLUTION (CONFIG_SPEAR_HZ_CLOCK / CONFIG_SPEAR_HZ) | |
31 | #define READ_TIMER() (readl(&gpt_regs_p->count) & GPT_FREE_RUNNING) | |
32 | ||
33 | static struct gpt_regs *const gpt_regs_p = | |
34 | (struct gpt_regs *)CONFIG_SPEAR_TIMERBASE; | |
35 | ||
36 | static struct misc_regs *const misc_regs_p = | |
37 | (struct misc_regs *)CONFIG_SPEAR_MISCBASE; | |
38 | ||
39 | static ulong timestamp; | |
40 | static ulong lastdec; | |
41 | ||
42 | int timer_init(void) | |
43 | { | |
44 | u32 synth; | |
45 | ||
46 | /* Prescaler setting */ | |
47 | #if defined(CONFIG_SPEAR3XX) | |
48 | writel(MISC_PRSC_CFG, &misc_regs_p->prsc2_clk_cfg); | |
49 | synth = MISC_GPT4SYNTH; | |
50 | #elif defined(CONFIG_SPEAR600) | |
51 | writel(MISC_PRSC_CFG, &misc_regs_p->prsc1_clk_cfg); | |
52 | synth = MISC_GPT3SYNTH; | |
53 | #else | |
54 | # error Incorrect config. Can only be spear{600|300|310|320} | |
55 | #endif | |
56 | ||
57 | writel(readl(&misc_regs_p->periph_clk_cfg) | synth, | |
58 | &misc_regs_p->periph_clk_cfg); | |
59 | ||
60 | /* disable timers */ | |
61 | writel(GPT_PRESCALER_1 | GPT_MODE_AUTO_RELOAD, &gpt_regs_p->control); | |
62 | ||
63 | /* load value for free running */ | |
64 | writel(GPT_FREE_RUNNING, &gpt_regs_p->compare); | |
65 | ||
66 | /* auto reload, start timer */ | |
67 | writel(readl(&gpt_regs_p->control) | GPT_ENABLE, &gpt_regs_p->control); | |
68 | ||
69 | reset_timer_masked(); | |
70 | ||
71 | return 0; | |
72 | } | |
73 | ||
74 | /* | |
75 | * timer without interrupts | |
76 | */ | |
77 | ||
78 | void reset_timer(void) | |
79 | { | |
80 | reset_timer_masked(); | |
81 | } | |
82 | ||
83 | ulong get_timer(ulong base) | |
84 | { | |
85 | return (get_timer_masked() / GPT_RESOLUTION) - base; | |
86 | } | |
87 | ||
88 | void set_timer(ulong t) | |
89 | { | |
90 | timestamp = t; | |
91 | } | |
92 | ||
93 | void __udelay(unsigned long usec) | |
94 | { | |
95 | ulong tmo; | |
96 | ulong start = get_timer_masked(); | |
97 | ulong tenudelcnt = CONFIG_SPEAR_HZ_CLOCK / (1000 * 100); | |
98 | ulong rndoff; | |
99 | ||
100 | rndoff = (usec % 10) ? 1 : 0; | |
101 | ||
102 | /* tenudelcnt timer tick gives 10 microsecconds delay */ | |
103 | tmo = ((usec / 10) + rndoff) * tenudelcnt; | |
104 | ||
105 | while ((ulong) (get_timer_masked() - start) < tmo) | |
106 | ; | |
107 | } | |
108 | ||
109 | void reset_timer_masked(void) | |
110 | { | |
111 | /* reset time */ | |
112 | lastdec = READ_TIMER(); | |
113 | timestamp = 0; | |
114 | } | |
115 | ||
116 | ulong get_timer_masked(void) | |
117 | { | |
118 | ulong now = READ_TIMER(); | |
119 | ||
120 | if (now >= lastdec) { | |
121 | /* normal mode */ | |
122 | timestamp += now - lastdec; | |
123 | } else { | |
124 | /* we have an overflow ... */ | |
125 | timestamp += now + GPT_FREE_RUNNING - lastdec; | |
126 | } | |
127 | lastdec = now; | |
128 | ||
129 | return timestamp; | |
130 | } | |
131 | ||
132 | void udelay_masked(unsigned long usec) | |
133 | { | |
134 | return udelay(usec); | |
135 | } | |
136 | ||
137 | /* | |
138 | * This function is derived from PowerPC code (read timebase as long long). | |
139 | * On ARM it just returns the timer value. | |
140 | */ | |
141 | unsigned long long get_ticks(void) | |
142 | { | |
143 | return get_timer(0); | |
144 | } | |
145 | ||
146 | /* | |
147 | * This function is derived from PowerPC code (timebase clock frequency). | |
148 | * On ARM it returns the number of timer ticks per second. | |
149 | */ | |
150 | ulong get_tbclk(void) | |
151 | { | |
152 | return CONFIG_SPEAR_HZ; | |
153 | } |