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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 4f6dc4c893de44e8d91008516c835e06b450e310 / . / drivers / timer / omap-timer.c
blob: 3f847984cb993f9d47a83a7864c922f134ddc556 [file] [log] [blame]
Tom Rini83d290c2018-05-06 17:58:06 -0400[diff] [blame]1// SPDX-License-Identifier: GPL-2.0+
Mugunthan V Ndadf3132015-12-24 16:08:07 +0530[diff] [blame]2/*
3 * TI OMAP timer driver
4 *
5 * Copyright (C) 2015, Texas Instruments, Incorporated
Mugunthan V Ndadf3132015-12-24 16:08:07 +0530[diff] [blame]6 */
7
8#include <common.h>
9#include <dm.h>
10#include <errno.h>
11#include <timer.h>
12#include <asm/io.h>
13#include <asm/arch/clock.h>
14
Mugunthan V Ndadf3132015-12-24 16:08:07 +0530[diff] [blame]15/* Timer register bits */
16#define TCLR_START BIT(0) /* Start=1 */
17#define TCLR_AUTO_RELOAD BIT(1) /* Auto reload */
18#define TCLR_PRE_EN BIT(5) /* Pre-scaler enable */
19#define TCLR_PTV_SHIFT (2) /* Pre-scaler shift value */
20
21#define TIMER_CLOCK (V_SCLK / (2 << CONFIG_SYS_PTV))
22
23struct omap_gptimer_regs {
24 unsigned int tidr; /* offset 0x00 */
25 unsigned char res1[12];
26 unsigned int tiocp_cfg; /* offset 0x10 */
27 unsigned char res2[12];
28 unsigned int tier; /* offset 0x20 */
29 unsigned int tistatr; /* offset 0x24 */
30 unsigned int tistat; /* offset 0x28 */
31 unsigned int tisr; /* offset 0x2c */
32 unsigned int tcicr; /* offset 0x30 */
33 unsigned int twer; /* offset 0x34 */
34 unsigned int tclr; /* offset 0x38 */
35 unsigned int tcrr; /* offset 0x3c */
36 unsigned int tldr; /* offset 0x40 */
37 unsigned int ttgr; /* offset 0x44 */
38 unsigned int twpc; /* offset 0x48 */
39 unsigned int tmar; /* offset 0x4c */
40 unsigned int tcar1; /* offset 0x50 */
41 unsigned int tscir; /* offset 0x54 */
42 unsigned int tcar2; /* offset 0x58 */
43};
44
45/* Omap Timer Priv */
46struct omap_timer_priv {
47 struct omap_gptimer_regs *regs;
48};
49
50static int omap_timer_get_count(struct udevice *dev, u64 *count)
51{
52 struct omap_timer_priv *priv = dev_get_priv(dev);
53
54 *count = readl(&priv->regs->tcrr);
55
56 return 0;
57}
58
59static int omap_timer_probe(struct udevice *dev)
60{
61 struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
62 struct omap_timer_priv *priv = dev_get_priv(dev);
63
64 uc_priv->clock_rate = TIMER_CLOCK;
65
66 /* start the counter ticking up, reload value on overflow */
67 writel(0, &priv->regs->tldr);
68 /* enable timer */
69 writel((CONFIG_SYS_PTV << 2) | TCLR_PRE_EN | TCLR_AUTO_RELOAD |
70 TCLR_START, &priv->regs->tclr);
71
72 return 0;
73}
74
75static int omap_timer_ofdata_to_platdata(struct udevice *dev)
76{
77 struct omap_timer_priv *priv = dev_get_priv(dev);
78
Simon Glassa821c4a2017-05-17 17:18:05 -0600[diff] [blame]79 priv->regs = map_physmem(devfdt_get_addr(dev),
Lokesh Vutla871ca262016-03-05 16:40:32 +0530[diff] [blame]80 sizeof(struct omap_gptimer_regs), MAP_NOCACHE);
Mugunthan V Ndadf3132015-12-24 16:08:07 +0530[diff] [blame]81
82 return 0;
83}
84
85
86static const struct timer_ops omap_timer_ops = {
87 .get_count = omap_timer_get_count,
88};
89
90static const struct udevice_id omap_timer_ids[] = {
91 { .compatible = "ti,am335x-timer" },
92 { .compatible = "ti,am4372-timer" },
93 { .compatible = "ti,omap5430-timer" },
94 {}
95};
96
97U_BOOT_DRIVER(omap_timer) = {
98 .name = "omap_timer",
99 .id = UCLASS_TIMER,
100 .of_match = omap_timer_ids,
101 .ofdata_to_platdata = omap_timer_ofdata_to_platdata,
102 .priv_auto_alloc_size = sizeof(struct omap_timer_priv),
103 .probe = omap_timer_probe,
104 .ops = &omap_timer_ops,
105 .flags = DM_FLAG_PRE_RELOC,
106};