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