1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Renesas RZ/A1 R7S72100 OSTM Timer driver
4 *
5 * Copyright (C) 2019 Marek Vasut <marek.vasut@gmail.com>
6 */
7
8 #include <clock_legacy.h>
9 #include <malloc.h>
10 #include <asm/global_data.h>
11 #include <asm/io.h>
12 #include <dm.h>
13 #include <clk.h>
14 #include <timer.h>
15 #include <linux/bitops.h>
16
17 #define OSTM_CMP 0x00
18 #define OSTM_CNT 0x04
19 #define OSTM_TE 0x10
20 #define OSTM_TS 0x14
21 #define OSTM_TT 0x18
22 #define OSTM_CTL 0x20
23 #define OSTM_CTL_D BIT(1)
24
25 DECLARE_GLOBAL_DATA_PTR;
26
27 struct ostm_priv {
28 fdt_addr_t regs;
29 };
30
ostm_get_count(struct udevice * dev)31 static u64 ostm_get_count(struct udevice *dev)
32 {
33 struct ostm_priv *priv = dev_get_priv(dev);
34
35 return timer_conv_64(readl(priv->regs + OSTM_CNT));
36 }
37
ostm_probe(struct udevice * dev)38 static int ostm_probe(struct udevice *dev)
39 {
40 struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
41 struct ostm_priv *priv = dev_get_priv(dev);
42 #if CONFIG_IS_ENABLED(CLK)
43 struct clk clk;
44 int ret;
45
46 ret = clk_get_by_index(dev, 0, &clk);
47 if (ret)
48 return ret;
49
50 uc_priv->clock_rate = clk_get_rate(&clk);
51 #else
52 uc_priv->clock_rate = get_board_sys_clk() / 2;
53 #endif
54
55 readb(priv->regs + OSTM_CTL);
56 writeb(OSTM_CTL_D, priv->regs + OSTM_CTL);
57
58 setbits_8(priv->regs + OSTM_TT, BIT(0));
59 writel(0xffffffff, priv->regs + OSTM_CMP);
60 setbits_8(priv->regs + OSTM_TS, BIT(0));
61
62 return 0;
63 }
64
ostm_of_to_plat(struct udevice * dev)65 static int ostm_of_to_plat(struct udevice *dev)
66 {
67 struct ostm_priv *priv = dev_get_priv(dev);
68
69 priv->regs = dev_read_addr(dev);
70
71 return 0;
72 }
73
74 static const struct timer_ops ostm_ops = {
75 .get_count = ostm_get_count,
76 };
77
78 static const struct udevice_id ostm_ids[] = {
79 { .compatible = "renesas,ostm" },
80 {}
81 };
82
83 U_BOOT_DRIVER(ostm_timer) = {
84 .name = "ostm-timer",
85 .id = UCLASS_TIMER,
86 .ops = &ostm_ops,
87 .probe = ostm_probe,
88 .of_match = ostm_ids,
89 .of_to_plat = ostm_of_to_plat,
90 .priv_auto = sizeof(struct ostm_priv),
91 };
92