4 * Copyright (C) 2015, Texas Instruments, Incorporated
6 * SPDX-License-Identifier: GPL-2.0+
14 #include <asm/arch/clock.h>
16 DECLARE_GLOBAL_DATA_PTR
;
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 */
24 #define TIMER_CLOCK (V_SCLK / (2 << CONFIG_SYS_PTV))
26 struct 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 */
49 struct omap_timer_priv
{
50 struct omap_gptimer_regs
*regs
;
53 static int omap_timer_get_count(struct udevice
*dev
, u64
*count
)
55 struct omap_timer_priv
*priv
= dev_get_priv(dev
);
57 *count
= readl(&priv
->regs
->tcrr
);
62 static int omap_timer_probe(struct udevice
*dev
)
64 struct timer_dev_priv
*uc_priv
= dev_get_uclass_priv(dev
);
65 struct omap_timer_priv
*priv
= dev_get_priv(dev
);
67 uc_priv
->clock_rate
= TIMER_CLOCK
;
69 /* start the counter ticking up, reload value on overflow */
70 writel(0, &priv
->regs
->tldr
);
72 writel((CONFIG_SYS_PTV
<< 2) | TCLR_PRE_EN
| TCLR_AUTO_RELOAD
|
73 TCLR_START
, &priv
->regs
->tclr
);
78 static int omap_timer_ofdata_to_platdata(struct udevice
*dev
)
80 struct omap_timer_priv
*priv
= dev_get_priv(dev
);
82 priv
->regs
= map_physmem(dev_get_addr(dev
),
83 sizeof(struct omap_gptimer_regs
), MAP_NOCACHE
);
89 static const struct timer_ops omap_timer_ops
= {
90 .get_count
= omap_timer_get_count
,
93 static const struct udevice_id omap_timer_ids
[] = {
94 { .compatible
= "ti,am335x-timer" },
95 { .compatible
= "ti,am4372-timer" },
96 { .compatible
= "ti,omap5430-timer" },
100 U_BOOT_DRIVER(omap_timer
) = {
101 .name
= "omap_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
,