1 // SPDX-License-Identifier: GPL-2.0+
5 * Copyright (C) 2015, Texas Instruments, Incorporated
13 #include <asm/arch/clock.h>
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 */
21 #define TIMER_CLOCK (V_SCLK / (2 << CONFIG_SYS_PTV))
23 struct 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 */
46 struct omap_timer_priv
{
47 struct omap_gptimer_regs
*regs
;
50 static int omap_timer_get_count(struct udevice
*dev
, u64
*count
)
52 struct omap_timer_priv
*priv
= dev_get_priv(dev
);
54 *count
= timer_conv_64(readl(&priv
->regs
->tcrr
));
59 static int omap_timer_probe(struct udevice
*dev
)
61 struct timer_dev_priv
*uc_priv
= dev_get_uclass_priv(dev
);
62 struct omap_timer_priv
*priv
= dev_get_priv(dev
);
64 if (!uc_priv
->clock_rate
)
65 uc_priv
->clock_rate
= TIMER_CLOCK
;
67 /* start the counter ticking up, reload value on overflow */
68 writel(0, &priv
->regs
->tldr
);
69 writel(0, &priv
->regs
->tcrr
);
71 writel((CONFIG_SYS_PTV
<< 2) | TCLR_PRE_EN
| TCLR_AUTO_RELOAD
|
72 TCLR_START
, &priv
->regs
->tclr
);
77 static int omap_timer_ofdata_to_platdata(struct udevice
*dev
)
79 struct omap_timer_priv
*priv
= dev_get_priv(dev
);
81 priv
->regs
= map_physmem(devfdt_get_addr(dev
),
82 sizeof(struct omap_gptimer_regs
), MAP_NOCACHE
);
88 static const struct timer_ops omap_timer_ops
= {
89 .get_count
= omap_timer_get_count
,
92 static const struct udevice_id omap_timer_ids
[] = {
93 { .compatible
= "ti,am335x-timer" },
94 { .compatible
= "ti,am4372-timer" },
95 { .compatible
= "ti,omap5430-timer" },
99 U_BOOT_DRIVER(omap_timer
) = {
100 .name
= "omap_timer",
102 .of_match
= omap_timer_ids
,
103 .ofdata_to_platdata
= omap_timer_ofdata_to_platdata
,
104 .priv_auto_alloc_size
= sizeof(struct omap_timer_priv
),
105 .probe
= omap_timer_probe
,
106 .ops
= &omap_timer_ops
,