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 <common.h>
9 #include <clock_legacy.h>
10 #include <malloc.h>
11 #include <asm/global_data.h>
12 #include <asm/io.h>
13 #include <dm.h>
14 #include <clk.h>
15 #include <timer.h>
16 #include <linux/bitops.h>
17
18 #define OSTM_CMP 0x00
19 #define OSTM_CNT 0x04
20 #define OSTM_TE 0x10
21 #define OSTM_TS 0x14
22 #define OSTM_TT 0x18
23 #define OSTM_CTL 0x20
24 #define OSTM_CTL_D BIT(1)
25
26 DECLARE_GLOBAL_DATA_PTR;
27
28 struct ostm_priv {
29 fdt_addr_t regs;
30 };
31
ostm_get_count(struct udevice * dev)32 static u64 ostm_get_count(struct udevice *dev)
33 {
34 struct ostm_priv *priv = dev_get_priv(dev);
35
36 return timer_conv_64(readl(priv->regs + OSTM_CNT));
37 }
38
ostm_probe(struct udevice * dev)39 static int ostm_probe(struct udevice *dev)
40 {
41 struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
42 struct ostm_priv *priv = dev_get_priv(dev);
43 #if CONFIG_IS_ENABLED(CLK)
44 struct clk clk;
45 int ret;
46
47 ret = clk_get_by_index(dev, 0, &clk);
48 if (ret)
49 return ret;
50
51 uc_priv->clock_rate = clk_get_rate(&clk);
52
53 clk_free(&clk);
54 #else
55 uc_priv->clock_rate = get_board_sys_clk() / 2;
56 #endif
57
58 readb(priv->regs + OSTM_CTL);
59 writeb(OSTM_CTL_D, priv->regs + OSTM_CTL);
60
61 setbits_8(priv->regs + OSTM_TT, BIT(0));
62 writel(0xffffffff, priv->regs + OSTM_CMP);
63 setbits_8(priv->regs + OSTM_TS, BIT(0));
64
65 return 0;
66 }
67
ostm_of_to_plat(struct udevice * dev)68 static int ostm_of_to_plat(struct udevice *dev)
69 {
70 struct ostm_priv *priv = dev_get_priv(dev);
71
72 priv->regs = dev_read_addr(dev);
73
74 return 0;
75 }
76
77 static const struct timer_ops ostm_ops = {
78 .get_count = ostm_get_count,
79 };
80
81 static const struct udevice_id ostm_ids[] = {
82 { .compatible = "renesas,ostm" },
83 {}
84 };
85
86 U_BOOT_DRIVER(ostm_timer) = {
87 .name = "ostm-timer",
88 .id = UCLASS_TIMER,
89 .ops = &ostm_ops,
90 .probe = ostm_probe,
91 .of_match = ostm_ids,
92 .of_to_plat = ostm_of_to_plat,
93 .priv_auto = sizeof(struct ostm_priv),
94 };
95