1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2019 Christoph Hellwig.
4 * Copyright (c) 2019 Western Digital Corporation or its affiliates.
5 */
6#include <linux/io.h>
7#include <linux/platform_device.h>
8#include <linux/of_platform.h>
9#include <linux/clk.h>
10#include <asm/soc.h>
11
12#include <soc/canaan/k210-sysctl.h>
13
14static int k210_sysctl_probe(struct platform_device *pdev)
15{
16 struct device *dev = &pdev->dev;
17 struct clk *pclk;
18 int ret;
19
20 dev_info(dev, "K210 system controller\n");
21
22 /* Get power bus clock */
23 pclk = devm_clk_get(dev, NULL);
24 if (IS_ERR(ptr: pclk))
25 return dev_err_probe(dev, err: PTR_ERR(ptr: pclk),
26 fmt: "Get bus clock failed\n");
27
28 ret = clk_prepare_enable(clk: pclk);
29 if (ret) {
30 dev_err(dev, "Enable bus clock failed\n");
31 return ret;
32 }
33
34 /* Populate children */
35 ret = devm_of_platform_populate(dev);
36 if (ret)
37 dev_err(dev, "Populate platform failed %d\n", ret);
38
39 return ret;
40}
41
42static const struct of_device_id k210_sysctl_of_match[] = {
43 { .compatible = "canaan,k210-sysctl", },
44 { /* sentinel */ },
45};
46
47static struct platform_driver k210_sysctl_driver = {
48 .driver = {
49 .name = "k210-sysctl",
50 .of_match_table = k210_sysctl_of_match,
51 },
52 .probe = k210_sysctl_probe,
53};
54builtin_platform_driver(k210_sysctl_driver);
55
56/*
57 * System controller registers base address and size.
58 */
59#define K210_SYSCTL_BASE_ADDR 0x50440000ULL
60#define K210_SYSCTL_BASE_SIZE 0x1000
61
62/*
63 * This needs to be called very early during initialization, given that
64 * PLL1 needs to be enabled to be able to use all SRAM.
65 */
66static void __init k210_soc_early_init(const void *fdt)
67{
68 void __iomem *sysctl_base;
69
70 sysctl_base = ioremap(K210_SYSCTL_BASE_ADDR, K210_SYSCTL_BASE_SIZE);
71 if (!sysctl_base)
72 panic(fmt: "k210-sysctl: ioremap failed");
73
74 k210_clk_early_init(regs: sysctl_base);
75
76 iounmap(addr: sysctl_base);
77}
78SOC_EARLY_INIT_DECLARE(k210_soc, "canaan,kendryte-k210", k210_soc_early_init);
79

source code of linux/drivers/soc/canaan/k210-sysctl.c