blob: d7c5460cd3c4813c91de96cc953e958e387a7d26 [file] [log] [blame]
maxims@google.com4697abe2017-01-18 13:44:55 -08001/*
2 * Copyright 2016 Google Inc.
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
8#include <dm.h>
9#include <errno.h>
10#include <timer.h>
11#include <asm/io.h>
12#include <asm/arch/timer.h>
13
14DECLARE_GLOBAL_DATA_PTR;
15
16#define AST_TICK_TIMER 1
17#define AST_TMC_RELOAD_VAL 0xffffffff
18
19struct ast_timer_priv {
20 struct ast_timer *regs;
21 struct ast_timer_counter *tmc;
22};
23
24static struct ast_timer_counter *ast_get_timer_counter(struct ast_timer *timer,
25 int n)
26{
27 if (n > 3)
28 return &timer->timers2[n - 4];
29 else
30 return &timer->timers1[n - 1];
31}
32
33static int ast_timer_probe(struct udevice *dev)
34{
35 struct ast_timer_priv *priv = dev_get_priv(dev);
36 struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
37
38 writel(AST_TMC_RELOAD_VAL, &priv->tmc->reload_val);
39
40 /*
41 * Stop the timer. This will also load reload_val into
42 * the status register.
43 */
44 clrbits_le32(&priv->regs->ctrl1,
45 AST_TMC_EN << AST_TMC_CTRL1_SHIFT(AST_TICK_TIMER));
46 /* Start the timer from the fixed 1MHz clock. */
47 setbits_le32(&priv->regs->ctrl1,
48 (AST_TMC_EN | AST_TMC_1MHZ) <<
49 AST_TMC_CTRL1_SHIFT(AST_TICK_TIMER));
50
51 uc_priv->clock_rate = AST_TMC_RATE;
52
53 return 0;
54}
55
56static int ast_timer_get_count(struct udevice *dev, u64 *count)
57{
58 struct ast_timer_priv *priv = dev_get_priv(dev);
59
60 *count = AST_TMC_RELOAD_VAL - readl(&priv->tmc->status);
61
62 return 0;
63}
64
65static int ast_timer_ofdata_to_platdata(struct udevice *dev)
66{
67 struct ast_timer_priv *priv = dev_get_priv(dev);
68
69 priv->regs = dev_get_addr_ptr(dev);
70 if (IS_ERR(priv->regs))
71 return PTR_ERR(priv->regs);
72
73 priv->tmc = ast_get_timer_counter(priv->regs, AST_TICK_TIMER);
74
75 return 0;
76}
77
78static const struct timer_ops ast_timer_ops = {
79 .get_count = ast_timer_get_count,
80};
81
82static const struct udevice_id ast_timer_ids[] = {
83 { .compatible = "aspeed,ast2500-timer" },
84 { .compatible = "aspeed,ast2400-timer" },
85 { }
86};
87
88U_BOOT_DRIVER(ast_timer) = {
89 .name = "ast_timer",
90 .id = UCLASS_TIMER,
91 .of_match = ast_timer_ids,
92 .probe = ast_timer_probe,
93 .priv_auto_alloc_size = sizeof(struct ast_timer_priv),
94 .ofdata_to_platdata = ast_timer_ofdata_to_platdata,
95 .ops = &ast_timer_ops,
96 .flags = DM_FLAG_PRE_RELOC,
97};