1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2017 Theobroma Systems Design und Consulting GmbH
4  */
5 
6 #include <common.h>
7 #include <dm.h>
8 #include <dm/ofnode.h>
9 #include <mapmem.h>
10 #include <asm/arch/timer.h>
11 #include <dt-structs.h>
12 #include <timer.h>
13 #include <asm/io.h>
14 
15 DECLARE_GLOBAL_DATA_PTR;
16 
17 #if CONFIG_IS_ENABLED(OF_PLATDATA)
18 struct rockchip_timer_plat {
19 	struct dtd_rockchip_rk3368_timer dtd;
20 };
21 #endif
22 
23 /* Driver private data. Contains timer id. Could be either 0 or 1. */
24 struct rockchip_timer_priv {
25 	struct rk_timer *timer;
26 };
27 
28 static inline int64_t rockchip_timer_get_curr_value(struct rk_timer *timer)
29 {
30 	uint64_t timebase_h, timebase_l;
31 	uint64_t cntr;
32 
33 	timebase_l = readl(&timer->timer_curr_value0);
34 	timebase_h = readl(&timer->timer_curr_value1);
35 
36 	cntr = timebase_h << 32 | timebase_l;
37 	return cntr;
38 }
39 
40 #if CONFIG_IS_ENABLED(BOOTSTAGE)
41 ulong timer_get_boot_us(void)
42 {
43 	uint64_t  ticks = 0;
44 	uint32_t  rate;
45 	uint64_t  us;
46 	int ret;
47 
48 	ret = dm_timer_init();
49 
50 	if (!ret) {
51 		/* The timer is available */
52 		rate = timer_get_rate(gd->timer);
53 		timer_get_count(gd->timer, &ticks);
54 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
55 	} else if (ret == -EAGAIN) {
56 		/* We have been called so early that the DM is not ready,... */
57 		ofnode node = offset_to_ofnode(-1);
58 		struct rk_timer *timer = NULL;
59 
60 		/*
61 		 * ... so we try to access the raw timer, if it is specified
62 		 * via the tick-timer property in /chosen.
63 		 */
64 		node = ofnode_get_chosen_node("tick-timer");
65 		if (!ofnode_valid(node)) {
66 			debug("%s: no /chosen/tick-timer\n", __func__);
67 			return 0;
68 		}
69 
70 		timer = (struct rk_timer *)ofnode_get_addr(node);
71 
72 		/* This timer is down-counting */
73 		ticks = ~0uLL - rockchip_timer_get_curr_value(timer);
74 		if (ofnode_read_u32(node, "clock-frequency", &rate)) {
75 			debug("%s: could not read clock-frequency\n", __func__);
76 			return 0;
77 		}
78 #endif
79 	} else {
80 		return 0;
81 	}
82 
83 	us = (ticks * 1000) / rate;
84 	return us;
85 }
86 #endif
87 
88 static int rockchip_timer_get_count(struct udevice *dev, u64 *count)
89 {
90 	struct rockchip_timer_priv *priv = dev_get_priv(dev);
91 	uint64_t cntr = rockchip_timer_get_curr_value(priv->timer);
92 
93 	/* timers are down-counting */
94 	*count = ~0ull - cntr;
95 	return 0;
96 }
97 
98 static int rockchip_clk_ofdata_to_platdata(struct udevice *dev)
99 {
100 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
101 	struct rockchip_timer_priv *priv = dev_get_priv(dev);
102 
103 	priv->timer = dev_read_addr_ptr(dev);
104 	if (!priv->timer)
105 		return -ENOENT;
106 #endif
107 
108 	return 0;
109 }
110 
111 static int rockchip_timer_start(struct udevice *dev)
112 {
113 	struct rockchip_timer_priv *priv = dev_get_priv(dev);
114 	const uint64_t reload_val = ~0uLL;
115 	const uint32_t reload_val_l = reload_val & 0xffffffff;
116 	const uint32_t reload_val_h = reload_val >> 32;
117 
118 	/* don't reinit, if the timer is already running and set up */
119 	if ((readl(&priv->timer->timer_ctrl_reg) & 1) == 1 &&
120 	    (readl(&priv->timer->timer_load_count0) == reload_val_l) &&
121 	    (readl(&priv->timer->timer_load_count1) == reload_val_h))
122 		return 0;
123 
124 	/* disable timer and reset all control */
125 	writel(0, &priv->timer->timer_ctrl_reg);
126 	/* write reload value */
127 	writel(reload_val_l, &priv->timer->timer_load_count0);
128 	writel(reload_val_h, &priv->timer->timer_load_count1);
129 	/* enable timer */
130 	writel(1, &priv->timer->timer_ctrl_reg);
131 
132 	return 0;
133 }
134 
135 static int rockchip_timer_probe(struct udevice *dev)
136 {
137 #if CONFIG_IS_ENABLED(OF_PLATDATA)
138 	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
139 	struct rockchip_timer_priv *priv = dev_get_priv(dev);
140 	struct rockchip_timer_plat *plat = dev_get_platdata(dev);
141 
142 	priv->timer = map_sysmem(plat->dtd.reg[0], plat->dtd.reg[1]);
143 	uc_priv->clock_rate = plat->dtd.clock_frequency;
144 #endif
145 
146 	return rockchip_timer_start(dev);
147 }
148 
149 static const struct timer_ops rockchip_timer_ops = {
150 	.get_count = rockchip_timer_get_count,
151 };
152 
153 static const struct udevice_id rockchip_timer_ids[] = {
154 	{ .compatible = "rockchip,rk3188-timer" },
155 	{ .compatible = "rockchip,rk3288-timer" },
156 	{ .compatible = "rockchip,rk3368-timer" },
157 	{}
158 };
159 
160 U_BOOT_DRIVER(rockchip_rk3368_timer) = {
161 	.name	= "rockchip_rk3368_timer",
162 	.id	= UCLASS_TIMER,
163 	.of_match = rockchip_timer_ids,
164 	.probe = rockchip_timer_probe,
165 	.ops	= &rockchip_timer_ops,
166 	.priv_auto_alloc_size = sizeof(struct rockchip_timer_priv),
167 #if CONFIG_IS_ENABLED(OF_PLATDATA)
168 	.platdata_auto_alloc_size = sizeof(struct rockchip_timer_plat),
169 #endif
170 	.ofdata_to_platdata = rockchip_clk_ofdata_to_platdata,
171 };
172