1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2022 Advanced Micro Devices, Inc
4 * Michal Simek <michal.simek@amd.com>
5 *
6 * (C) Copyright 2007 Michal Simek
7 * Michal SIMEK <monstr@monstr.eu>
8 */
9
10 #include <dm.h>
11 #include <timer.h>
12 #include <regmap.h>
13 #include <dm/device_compat.h>
14
15 #define TIMER_ENABLE_ALL 0x400 /* ENALL */
16 #define TIMER_PWM 0x200 /* PWMA0 */
17 #define TIMER_INTERRUPT 0x100 /* T0INT */
18 #define TIMER_ENABLE 0x080 /* ENT0 */
19 #define TIMER_ENABLE_INTR 0x040 /* ENIT0 */
20 #define TIMER_RESET 0x020 /* LOAD0 */
21 #define TIMER_RELOAD 0x010 /* ARHT0 */
22 #define TIMER_EXT_CAPTURE 0x008 /* CAPT0 */
23 #define TIMER_EXT_COMPARE 0x004 /* GENT0 */
24 #define TIMER_DOWN_COUNT 0x002 /* UDT0 */
25 #define TIMER_CAPTURE_MODE 0x001 /* MDT0 */
26
27 #define TIMER_CONTROL_OFFSET 0
28 #define TIMER_LOADREG_OFFSET 4
29 #define TIMER_COUNTER_OFFSET 8
30
31 struct xilinx_timer_priv {
32 struct regmap *regs;
33 };
34
xilinx_timer_get_count(struct udevice * dev)35 static u64 xilinx_timer_get_count(struct udevice *dev)
36 {
37 struct xilinx_timer_priv *priv = dev_get_priv(dev);
38 u32 value;
39
40 regmap_read(priv->regs, TIMER_COUNTER_OFFSET, &value);
41
42 return timer_conv_64(value);
43 }
44
xilinx_timer_probe(struct udevice * dev)45 static int xilinx_timer_probe(struct udevice *dev)
46 {
47 struct xilinx_timer_priv *priv = dev_get_priv(dev);
48 int ret;
49
50 /* uc_priv->clock_rate has already clock rate */
51 ret = regmap_init_mem(dev_ofnode(dev), &priv->regs);
52 if (ret) {
53 dev_dbg(dev, "failed to get regbase of timer\n");
54 return ret;
55 }
56
57 regmap_write(priv->regs, TIMER_LOADREG_OFFSET, 0);
58 regmap_write(priv->regs, TIMER_CONTROL_OFFSET, TIMER_RESET);
59 regmap_write(priv->regs, TIMER_CONTROL_OFFSET,
60 TIMER_ENABLE | TIMER_RELOAD);
61
62 return 0;
63 }
64
65 static const struct timer_ops xilinx_timer_ops = {
66 .get_count = xilinx_timer_get_count,
67 };
68
69 static const struct udevice_id xilinx_timer_ids[] = {
70 { .compatible = "xlnx,xps-timer-1.00.a" },
71 {}
72 };
73
74 U_BOOT_DRIVER(xilinx_timer) = {
75 .name = "xilinx_timer",
76 .id = UCLASS_TIMER,
77 .of_match = xilinx_timer_ids,
78 .priv_auto = sizeof(struct xilinx_timer_priv),
79 .probe = xilinx_timer_probe,
80 .ops = &xilinx_timer_ops,
81 };
82