4 * Copyright (C) 2015, Texas Instruments, Incorporated
6 * SPDX-License-Identifier: GPL-2.0+
14 #include <asm/arch/clock.h>
16 /* Timer register bits */
17 #define TCLR_START BIT(0) /* Start=1 */
18 #define TCLR_AUTO_RELOAD BIT(1) /* Auto reload */
19 #define TCLR_PRE_EN BIT(5) /* Pre-scaler enable */
20 #define TCLR_PTV_SHIFT (2) /* Pre-scaler shift value */
22 #define TIMER_CLOCK (V_SCLK / (2 << CONFIG_SYS_PTV))
24 struct omap_gptimer_regs {
25 unsigned int tidr; /* offset 0x00 */
26 unsigned char res1[12];
27 unsigned int tiocp_cfg; /* offset 0x10 */
28 unsigned char res2[12];
29 unsigned int tier; /* offset 0x20 */
30 unsigned int tistatr; /* offset 0x24 */
31 unsigned int tistat; /* offset 0x28 */
32 unsigned int tisr; /* offset 0x2c */
33 unsigned int tcicr; /* offset 0x30 */
34 unsigned int twer; /* offset 0x34 */
35 unsigned int tclr; /* offset 0x38 */
36 unsigned int tcrr; /* offset 0x3c */
37 unsigned int tldr; /* offset 0x40 */
38 unsigned int ttgr; /* offset 0x44 */
39 unsigned int twpc; /* offset 0x48 */
40 unsigned int tmar; /* offset 0x4c */
41 unsigned int tcar1; /* offset 0x50 */
42 unsigned int tscir; /* offset 0x54 */
43 unsigned int tcar2; /* offset 0x58 */
47 struct omap_timer_priv {
48 struct omap_gptimer_regs *regs;
51 static int omap_timer_get_count(struct udevice *dev, u64 *count)
53 struct omap_timer_priv *priv = dev_get_priv(dev);
55 *count = readl(&priv->regs->tcrr);
60 static int omap_timer_probe(struct udevice *dev)
62 struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
63 struct omap_timer_priv *priv = dev_get_priv(dev);
65 uc_priv->clock_rate = TIMER_CLOCK;
67 /* start the counter ticking up, reload value on overflow */
68 writel(0, &priv->regs->tldr);
70 writel((CONFIG_SYS_PTV << 2) | TCLR_PRE_EN | TCLR_AUTO_RELOAD |
71 TCLR_START, &priv->regs->tclr);
76 static int omap_timer_ofdata_to_platdata(struct udevice *dev)
78 struct omap_timer_priv *priv = dev_get_priv(dev);
80 priv->regs = map_physmem(devfdt_get_addr(dev),
81 sizeof(struct omap_gptimer_regs), MAP_NOCACHE);
87 static const struct timer_ops omap_timer_ops = {
88 .get_count = omap_timer_get_count,
91 static const struct udevice_id omap_timer_ids[] = {
92 { .compatible = "ti,am335x-timer" },
93 { .compatible = "ti,am4372-timer" },
94 { .compatible = "ti,omap5430-timer" },
98 U_BOOT_DRIVER(omap_timer) = {
101 .of_match = omap_timer_ids,
102 .ofdata_to_platdata = omap_timer_ofdata_to_platdata,
103 .priv_auto_alloc_size = sizeof(struct omap_timer_priv),
104 .probe = omap_timer_probe,
105 .ops = &omap_timer_ops,
106 .flags = DM_FLAG_PRE_RELOC,