2 * (C) Copyright 2000-2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
6 * Scott McNutt <smcnutt@psyent.com>
8 * SPDX-License-Identifier: GPL-2.0+
17 DECLARE_GLOBAL_DATA_PTR
;
19 /* control register */
20 #define ALTERA_TIMER_CONT BIT(1) /* Continuous mode */
21 #define ALTERA_TIMER_START BIT(2) /* Start timer */
22 #define ALTERA_TIMER_STOP BIT(3) /* Stop timer */
24 struct altera_timer_regs
{
25 u32 status
; /* Timer status reg */
26 u32 control
; /* Timer control reg */
27 u32 periodl
; /* Timeout period low */
28 u32 periodh
; /* Timeout period high */
29 u32 snapl
; /* Snapshot low */
30 u32 snaph
; /* Snapshot high */
33 struct altera_timer_platdata
{
34 struct altera_timer_regs
*regs
;
37 static int altera_timer_get_count(struct udevice
*dev
, u64
*count
)
39 struct altera_timer_platdata
*plat
= dev
->platdata
;
40 struct altera_timer_regs
*const regs
= plat
->regs
;
44 writel(0x0, ®s
->snapl
);
46 /* Read timer value */
47 val
= readl(®s
->snapl
) & 0xffff;
48 val
|= (readl(®s
->snaph
) & 0xffff) << 16;
49 *count
= timer_conv_64(~val
);
54 static int altera_timer_probe(struct udevice
*dev
)
56 struct altera_timer_platdata
*plat
= dev
->platdata
;
57 struct altera_timer_regs
*const regs
= plat
->regs
;
59 writel(0, ®s
->status
);
60 writel(0, ®s
->control
);
61 writel(ALTERA_TIMER_STOP
, ®s
->control
);
63 writel(0xffff, ®s
->periodl
);
64 writel(0xffff, ®s
->periodh
);
65 writel(ALTERA_TIMER_CONT
| ALTERA_TIMER_START
, ®s
->control
);
70 static int altera_timer_ofdata_to_platdata(struct udevice
*dev
)
72 struct altera_timer_platdata
*plat
= dev_get_platdata(dev
);
74 plat
->regs
= map_physmem(dev_get_addr(dev
),
75 sizeof(struct altera_timer_regs
),
81 static const struct timer_ops altera_timer_ops
= {
82 .get_count
= altera_timer_get_count
,
85 static const struct udevice_id altera_timer_ids
[] = {
86 { .compatible
= "altr,timer-1.0" },
90 U_BOOT_DRIVER(altera_timer
) = {
91 .name
= "altera_timer",
93 .of_match
= altera_timer_ids
,
94 .ofdata_to_platdata
= altera_timer_ofdata_to_platdata
,
95 .platdata_auto_alloc_size
= sizeof(struct altera_timer_platdata
),
96 .probe
= altera_timer_probe
,
97 .ops
= &altera_timer_ops
,
98 .flags
= DM_FLAG_PRE_RELOC
,