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1 | /* | |
2 | * (C) Copyright 2000-2002 | |
3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
4 | * | |
5 | * (C) Copyright 2004, Psyent Corporation <www.psyent.com> | |
6 | * Scott McNutt <smcnutt@psyent.com> | |
7 | * | |
8 | * SPDX-License-Identifier: GPL-2.0+ | |
9 | */ | |
10 | ||
11 | #include <common.h> | |
12 | #include <dm.h> | |
13 | #include <errno.h> | |
14 | #include <timer.h> | |
15 | #include <asm/io.h> | |
16 | ||
17 | DECLARE_GLOBAL_DATA_PTR; | |
18 | ||
19 | /* control register */ | |
20 | #define ALTERA_TIMER_CONT BIT(1) /* Continuous mode */ | |
21 | #define ALTERA_TIMER_START BIT(2) /* Start timer */ | |
22 | #define ALTERA_TIMER_STOP BIT(3) /* Stop timer */ | |
23 | ||
24 | struct altera_timer_regs { | |
25 | u32 status; /* Timer status reg */ | |
26 | u32 control; /* Timer control reg */ | |
27 | u32 periodl; /* Timeout period low */ | |
28 | u32 periodh; /* Timeout period high */ | |
29 | u32 snapl; /* Snapshot low */ | |
30 | u32 snaph; /* Snapshot high */ | |
31 | }; | |
32 | ||
33 | struct altera_timer_platdata { | |
34 | struct altera_timer_regs *regs; | |
35 | }; | |
36 | ||
37 | static int altera_timer_get_count(struct udevice *dev, u64 *count) | |
38 | { | |
39 | struct altera_timer_platdata *plat = dev->platdata; | |
40 | struct altera_timer_regs *const regs = plat->regs; | |
41 | u32 val; | |
42 | ||
43 | /* Trigger update */ | |
44 | writel(0x0, ®s->snapl); | |
45 | ||
46 | /* Read timer value */ | |
47 | val = readl(®s->snapl) & 0xffff; | |
48 | val |= (readl(®s->snaph) & 0xffff) << 16; | |
49 | *count = timer_conv_64(~val); | |
50 | ||
51 | return 0; | |
52 | } | |
53 | ||
54 | static int altera_timer_probe(struct udevice *dev) | |
55 | { | |
56 | struct altera_timer_platdata *plat = dev->platdata; | |
57 | struct altera_timer_regs *const regs = plat->regs; | |
58 | ||
59 | writel(0, ®s->status); | |
60 | writel(0, ®s->control); | |
61 | writel(ALTERA_TIMER_STOP, ®s->control); | |
62 | ||
63 | writel(0xffff, ®s->periodl); | |
64 | writel(0xffff, ®s->periodh); | |
65 | writel(ALTERA_TIMER_CONT | ALTERA_TIMER_START, ®s->control); | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | static int altera_timer_ofdata_to_platdata(struct udevice *dev) | |
71 | { | |
72 | struct altera_timer_platdata *plat = dev_get_platdata(dev); | |
73 | ||
74 | plat->regs = map_physmem(devfdt_get_addr(dev), | |
75 | sizeof(struct altera_timer_regs), | |
76 | MAP_NOCACHE); | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | static const struct timer_ops altera_timer_ops = { | |
82 | .get_count = altera_timer_get_count, | |
83 | }; | |
84 | ||
85 | static const struct udevice_id altera_timer_ids[] = { | |
86 | { .compatible = "altr,timer-1.0" }, | |
87 | {} | |
88 | }; | |
89 | ||
90 | U_BOOT_DRIVER(altera_timer) = { | |
91 | .name = "altera_timer", | |
92 | .id = UCLASS_TIMER, | |
93 | .of_match = altera_timer_ids, | |
94 | .ofdata_to_platdata = altera_timer_ofdata_to_platdata, | |
95 | .platdata_auto_alloc_size = sizeof(struct altera_timer_platdata), | |
96 | .probe = altera_timer_probe, | |
97 | .ops = &altera_timer_ops, | |
98 | .flags = DM_FLAG_PRE_RELOC, | |
99 | }; |