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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / f82290afc84716a16a8e300d5d17702858ba84ea / . / drivers / timer / omap-timer.c
blob: 4cc6105505739365f3b7ba408165c3e9211ac2ac [file] [log] [blame]
Mugunthan V Ndadf3132015-12-24 16:08:07 +0530[diff] [blame]1/*
2 * TI OMAP timer driver
3 *
4 * Copyright (C) 2015, Texas Instruments, Incorporated
5 *
6 * SPDX-License-Identifier: GPL-2.0+
7 */
8
9#include <common.h>
10#include <dm.h>
11#include <errno.h>
12#include <timer.h>
13#include <asm/io.h>
14#include <asm/arch/clock.h>
15
16DECLARE_GLOBAL_DATA_PTR;
17
18/* Timer register bits */
19#define TCLR_START BIT(0) /* Start=1 */
20#define TCLR_AUTO_RELOAD BIT(1) /* Auto reload */
21#define TCLR_PRE_EN BIT(5) /* Pre-scaler enable */
22#define TCLR_PTV_SHIFT (2) /* Pre-scaler shift value */
23
24#define TIMER_CLOCK (V_SCLK / (2 << CONFIG_SYS_PTV))
25
26struct omap_gptimer_regs {
27 unsigned int tidr; /* offset 0x00 */
28 unsigned char res1[12];
29 unsigned int tiocp_cfg; /* offset 0x10 */
30 unsigned char res2[12];
31 unsigned int tier; /* offset 0x20 */
32 unsigned int tistatr; /* offset 0x24 */
33 unsigned int tistat; /* offset 0x28 */
34 unsigned int tisr; /* offset 0x2c */
35 unsigned int tcicr; /* offset 0x30 */
36 unsigned int twer; /* offset 0x34 */
37 unsigned int tclr; /* offset 0x38 */
38 unsigned int tcrr; /* offset 0x3c */
39 unsigned int tldr; /* offset 0x40 */
40 unsigned int ttgr; /* offset 0x44 */
41 unsigned int twpc; /* offset 0x48 */
42 unsigned int tmar; /* offset 0x4c */
43 unsigned int tcar1; /* offset 0x50 */
44 unsigned int tscir; /* offset 0x54 */
45 unsigned int tcar2; /* offset 0x58 */
46};
47
48/* Omap Timer Priv */
49struct omap_timer_priv {
50 struct omap_gptimer_regs *regs;
51};
52
53static int omap_timer_get_count(struct udevice *dev, u64 *count)
54{
55 struct omap_timer_priv *priv = dev_get_priv(dev);
56
57 *count = readl(&priv->regs->tcrr);
58
59 return 0;
60}
61
62static int omap_timer_probe(struct udevice *dev)
63{
64 struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
65 struct omap_timer_priv *priv = dev_get_priv(dev);
66
67 uc_priv->clock_rate = TIMER_CLOCK;
68
69 /* start the counter ticking up, reload value on overflow */
70 writel(0, &priv->regs->tldr);
71 /* enable timer */
72 writel((CONFIG_SYS_PTV << 2) | TCLR_PRE_EN | TCLR_AUTO_RELOAD |
73 TCLR_START, &priv->regs->tclr);
74
75 return 0;
76}
77
78static int omap_timer_ofdata_to_platdata(struct udevice *dev)
79{
80 struct omap_timer_priv *priv = dev_get_priv(dev);
81
Simon Glassa821c4a2017-05-17 17:18:05 -0600[diff] [blame]82 priv->regs = map_physmem(devfdt_get_addr(dev),
Lokesh Vutla871ca262016-03-05 16:40:32 +0530[diff] [blame]83 sizeof(struct omap_gptimer_regs), MAP_NOCACHE);
Mugunthan V Ndadf3132015-12-24 16:08:07 +0530[diff] [blame]84
85 return 0;
86}
87
88
89static const struct timer_ops omap_timer_ops = {
90 .get_count = omap_timer_get_count,
91};
92
93static const struct udevice_id omap_timer_ids[] = {
94 { .compatible = "ti,am335x-timer" },
95 { .compatible = "ti,am4372-timer" },
96 { .compatible = "ti,omap5430-timer" },
97 {}
98};
99
100U_BOOT_DRIVER(omap_timer) = {
101 .name = "omap_timer",
102 .id = UCLASS_TIMER,
103 .of_match = omap_timer_ids,
104 .ofdata_to_platdata = omap_timer_ofdata_to_platdata,
105 .priv_auto_alloc_size = sizeof(struct omap_timer_priv),
106 .probe = omap_timer_probe,
107 .ops = &omap_timer_ops,
108 .flags = DM_FLAG_PRE_RELOC,
109};