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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7ec80ddf | 2 | /* |
3 | * linux/arch/arm/mach-w90x900/time.c | |
4 | * | |
5 | * Based on linux/arch/arm/plat-s3c24xx/time.c by Ben Dooks | |
6 | * | |
58b5369e | 7 | * Copyright (c) 2009 Nuvoton technology corporation |
7ec80ddf | 8 | * All rights reserved. |
9 | * | |
10 | * Wan ZongShun <mcuos.com@gmail.com> | |
7ec80ddf | 11 | */ |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/clk.h> | |
19 | #include <linux/io.h> | |
20 | #include <linux/leds.h> | |
58b5369e | 21 | #include <linux/clocksource.h> |
22 | #include <linux/clockchips.h> | |
7ec80ddf | 23 | |
24 | #include <asm/mach-types.h> | |
25 | #include <asm/mach/irq.h> | |
26 | #include <asm/mach/time.h> | |
27 | ||
7ec80ddf | 28 | #include <mach/map.h> |
1d8f3c49 | 29 | #include "regs-timer.h" |
7ec80ddf | 30 | |
e5bc9e25 RK |
31 | #include "nuc9xx.h" |
32 | ||
58b5369e | 33 | #define RESETINT 0x1f |
34 | #define PERIOD (0x01 << 27) | |
35 | #define ONESHOT (0x00 << 27) | |
36 | #define COUNTEN (0x01 << 30) | |
37 | #define INTEN (0x01 << 29) | |
38 | ||
39 | #define TICKS_PER_SEC 100 | |
40 | #define PRESCALE 0x63 /* Divider = prescale + 1 */ | |
41 | ||
1368c51c | 42 | #define TDR_SHIFT 24 |
1368c51c LJ |
43 | |
44 | static unsigned int timer0_load; | |
58b5369e | 45 | |
6c724d43 | 46 | static int nuc900_clockevent_shutdown(struct clock_event_device *evt) |
7ec80ddf | 47 | { |
6c724d43 | 48 | unsigned int val = __raw_readl(REG_TCSR0) & ~(0x03 << 27); |
58b5369e | 49 | |
6c724d43 VK |
50 | __raw_writel(val, REG_TCSR0); |
51 | return 0; | |
52 | } | |
53 | ||
54 | static int nuc900_clockevent_set_oneshot(struct clock_event_device *evt) | |
55 | { | |
56 | unsigned int val = __raw_readl(REG_TCSR0) & ~(0x03 << 27); | |
58b5369e | 57 | |
6c724d43 | 58 | val |= (ONESHOT | COUNTEN | INTEN | PRESCALE); |
58b5369e | 59 | |
6c724d43 VK |
60 | __raw_writel(val, REG_TCSR0); |
61 | return 0; | |
62 | } | |
58b5369e | 63 | |
6c724d43 VK |
64 | static int nuc900_clockevent_set_periodic(struct clock_event_device *evt) |
65 | { | |
66 | unsigned int val = __raw_readl(REG_TCSR0) & ~(0x03 << 27); | |
58b5369e | 67 | |
6c724d43 VK |
68 | __raw_writel(timer0_load, REG_TICR0); |
69 | val |= (PERIOD | COUNTEN | INTEN | PRESCALE); | |
58b5369e | 70 | __raw_writel(val, REG_TCSR0); |
6c724d43 | 71 | return 0; |
58b5369e | 72 | } |
73 | ||
35c9221a | 74 | static int nuc900_clockevent_setnextevent(unsigned long evt, |
58b5369e | 75 | struct clock_event_device *clk) |
76 | { | |
77 | unsigned int val; | |
78 | ||
79 | __raw_writel(evt, REG_TICR0); | |
80 | ||
81 | val = __raw_readl(REG_TCSR0); | |
82 | val |= (COUNTEN | INTEN | PRESCALE); | |
83 | __raw_writel(val, REG_TCSR0); | |
84 | ||
7ec80ddf | 85 | return 0; |
86 | } | |
87 | ||
35c9221a | 88 | static struct clock_event_device nuc900_clockevent_device = { |
6c724d43 VK |
89 | .name = "nuc900-timer0", |
90 | .features = CLOCK_EVT_FEAT_PERIODIC | | |
91 | CLOCK_EVT_FEAT_ONESHOT, | |
92 | .set_state_shutdown = nuc900_clockevent_shutdown, | |
93 | .set_state_periodic = nuc900_clockevent_set_periodic, | |
94 | .set_state_oneshot = nuc900_clockevent_set_oneshot, | |
95 | .tick_resume = nuc900_clockevent_shutdown, | |
96 | .set_next_event = nuc900_clockevent_setnextevent, | |
97 | .rating = 300, | |
58b5369e | 98 | }; |
99 | ||
7ec80ddf | 100 | /*IRQ handler for the timer*/ |
101 | ||
35c9221a | 102 | static irqreturn_t nuc900_timer0_interrupt(int irq, void *dev_id) |
7ec80ddf | 103 | { |
35c9221a | 104 | struct clock_event_device *evt = &nuc900_clockevent_device; |
58b5369e | 105 | |
7ec80ddf | 106 | __raw_writel(0x01, REG_TISR); /* clear TIF0 */ |
58b5369e | 107 | |
108 | evt->event_handler(evt); | |
7ec80ddf | 109 | return IRQ_HANDLED; |
110 | } | |
111 | ||
35c9221a | 112 | static struct irqaction nuc900_timer0_irq = { |
113 | .name = "nuc900-timer0", | |
2ed71e75 | 114 | .flags = IRQF_TIMER | IRQF_IRQPOLL, |
35c9221a | 115 | .handler = nuc900_timer0_interrupt, |
7ec80ddf | 116 | }; |
117 | ||
1368c51c | 118 | static void __init nuc900_clockevents_init(void) |
58b5369e | 119 | { |
1368c51c LJ |
120 | unsigned int rate; |
121 | struct clk *clk = clk_get(NULL, "timer0"); | |
122 | ||
123 | BUG_ON(IS_ERR(clk)); | |
124 | ||
125 | __raw_writel(0x00, REG_TCSR0); | |
126 | ||
127 | clk_enable(clk); | |
128 | rate = clk_get_rate(clk) / (PRESCALE + 1); | |
129 | ||
130 | timer0_load = (rate / TICKS_PER_SEC); | |
131 | ||
132 | __raw_writel(RESETINT, REG_TISR); | |
133 | setup_irq(IRQ_TIMER0, &nuc900_timer0_irq); | |
134 | ||
35c9221a | 135 | nuc900_clockevent_device.cpumask = cpumask_of(0); |
136 | ||
838a2ae8 SG |
137 | clockevents_config_and_register(&nuc900_clockevent_device, rate, |
138 | 0xf, 0xffffffff); | |
58b5369e | 139 | } |
140 | ||
1368c51c | 141 | static void __init nuc900_clocksource_init(void) |
7ec80ddf | 142 | { |
58b5369e | 143 | unsigned int val; |
1368c51c LJ |
144 | unsigned int rate; |
145 | struct clk *clk = clk_get(NULL, "timer1"); | |
146 | ||
147 | BUG_ON(IS_ERR(clk)); | |
148 | ||
149 | __raw_writel(0x00, REG_TCSR1); | |
150 | ||
151 | clk_enable(clk); | |
152 | rate = clk_get_rate(clk) / (PRESCALE + 1); | |
58b5369e | 153 | |
154 | __raw_writel(0xffffffff, REG_TICR1); | |
155 | ||
156 | val = __raw_readl(REG_TCSR1); | |
1368c51c | 157 | val |= (COUNTEN | PERIOD | PRESCALE); |
58b5369e | 158 | __raw_writel(val, REG_TCSR1); |
159 | ||
6fa5d5f7 RK |
160 | clocksource_mmio_init(REG_TDR1, "nuc900-timer1", rate, 200, |
161 | TDR_SHIFT, clocksource_mmio_readl_down); | |
58b5369e | 162 | } |
163 | ||
6bb27d73 | 164 | void __init nuc900_timer_init(void) |
58b5369e | 165 | { |
1368c51c LJ |
166 | nuc900_clocksource_init(); |
167 | nuc900_clockevents_init(); | |
7ec80ddf | 168 | } |