1 // SPDX-License-Identifier: GPL-2.0+
3 * Designware APB Timer driver
5 * Copyright (C) 2018 Marek Vasut <marex@denx.de>
14 #include <asm/arch/timer.h>
16 #define DW_APB_LOAD_VAL 0x0
17 #define DW_APB_CURR_VAL 0x4
18 #define DW_APB_CTRL 0x8
20 struct dw_apb_timer_priv {
24 static int dw_apb_timer_get_count(struct udevice *dev, u64 *count)
26 struct dw_apb_timer_priv *priv = dev_get_priv(dev);
29 * The DW APB counter counts down, but this function
30 * requires the count to be incrementing. Invert the
33 *count = timer_conv_64(~readl(priv->regs + DW_APB_CURR_VAL));
38 static int dw_apb_timer_probe(struct udevice *dev)
40 struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
41 struct dw_apb_timer_priv *priv = dev_get_priv(dev);
45 ret = clk_get_by_index(dev, 0, &clk);
49 uc_priv->clock_rate = clk_get_rate(&clk);
54 writel(0xffffffff, priv->regs + DW_APB_LOAD_VAL);
55 writel(0xffffffff, priv->regs + DW_APB_CURR_VAL);
56 setbits_le32(priv->regs + DW_APB_CTRL, 0x3);
61 static int dw_apb_timer_ofdata_to_platdata(struct udevice *dev)
63 struct dw_apb_timer_priv *priv = dev_get_priv(dev);
65 priv->regs = dev_read_addr(dev);
70 static const struct timer_ops dw_apb_timer_ops = {
71 .get_count = dw_apb_timer_get_count,
74 static const struct udevice_id dw_apb_timer_ids[] = {
75 { .compatible = "snps,dw-apb-timer" },
79 U_BOOT_DRIVER(dw_apb_timer) = {
80 .name = "dw_apb_timer",
82 .ops = &dw_apb_timer_ops,
83 .probe = dw_apb_timer_probe,
84 .of_match = dw_apb_timer_ids,
85 .ofdata_to_platdata = dw_apb_timer_ofdata_to_platdata,
86 .priv_auto_alloc_size = sizeof(struct dw_apb_timer_priv),