1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2017 Microchip Corporation
4 * Wenyou.Yang <wenyou.yang@microchip.com>
5 */
6
7 #include <common.h>
8 #include <clk.h>
9 #include <dm.h>
10 #include <timer.h>
11 #include <asm/io.h>
12
13 #define AT91_PIT_VALUE 0xfffff
14 #define AT91_PIT_PITEN BIT(24) /* Timer Enabled */
15
16 struct atmel_pit_regs {
17 u32 mode;
18 u32 status;
19 u32 value;
20 u32 value_image;
21 };
22
23 struct atmel_pit_platdata {
24 struct atmel_pit_regs *regs;
25 };
26
atmel_pit_get_count(struct udevice * dev,u64 * count)27 static int atmel_pit_get_count(struct udevice *dev, u64 *count)
28 {
29 struct atmel_pit_platdata *plat = dev_get_platdata(dev);
30 struct atmel_pit_regs *const regs = plat->regs;
31 u32 val = readl(®s->value_image);
32
33 *count = timer_conv_64(val);
34
35 return 0;
36 }
37
atmel_pit_probe(struct udevice * dev)38 static int atmel_pit_probe(struct udevice *dev)
39 {
40 struct atmel_pit_platdata *plat = dev_get_platdata(dev);
41 struct atmel_pit_regs *const regs = plat->regs;
42 struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
43 struct clk clk;
44 ulong clk_rate;
45 int ret;
46
47 ret = clk_get_by_index(dev, 0, &clk);
48 if (ret)
49 return -EINVAL;
50
51 clk_rate = clk_get_rate(&clk);
52 if (!clk_rate)
53 return -EINVAL;
54
55 uc_priv->clock_rate = clk_rate / 16;
56
57 writel(AT91_PIT_VALUE | AT91_PIT_PITEN, ®s->mode);
58
59 return 0;
60 }
61
atmel_pit_ofdata_to_platdata(struct udevice * dev)62 static int atmel_pit_ofdata_to_platdata(struct udevice *dev)
63 {
64 struct atmel_pit_platdata *plat = dev_get_platdata(dev);
65
66 plat->regs = (struct atmel_pit_regs *)devfdt_get_addr_ptr(dev);
67
68 return 0;
69 }
70
71 static const struct timer_ops atmel_pit_ops = {
72 .get_count = atmel_pit_get_count,
73 };
74
75 static const struct udevice_id atmel_pit_ids[] = {
76 { .compatible = "atmel,at91sam9260-pit" },
77 { }
78 };
79
80 U_BOOT_DRIVER(atmel_pit) = {
81 .name = "atmel_pit",
82 .id = UCLASS_TIMER,
83 .of_match = atmel_pit_ids,
84 .ofdata_to_platdata = atmel_pit_ofdata_to_platdata,
85 .platdata_auto_alloc_size = sizeof(struct atmel_pit_platdata),
86 .probe = atmel_pit_probe,
87 .ops = &atmel_pit_ops,
88 };
89