xref: /linux/drivers/soc/canaan/k210-sysctl.c (revision c532de5a67a70f8533d495f8f2aaa9a0491c3ad0)
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 
14 static 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(pclk))
25 		return dev_err_probe(dev, PTR_ERR(pclk),
26 				     "Get bus clock failed\n");
27 
28 	ret = clk_prepare_enable(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 
42 static const struct of_device_id k210_sysctl_of_match[] = {
43 	{ .compatible = "canaan,k210-sysctl", },
44 	{ /* sentinel */ },
45 };
46 
47 static 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 };
54 builtin_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  */
66 static 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("k210-sysctl: ioremap failed");
73 
74 	k210_clk_early_init(sysctl_base);
75 
76 	iounmap(sysctl_base);
77 }
78 SOC_EARLY_INIT_DECLARE(k210_soc, "canaan,kendryte-k210", k210_soc_early_init);
79