drivers/soc/canaan/k210-sysctl.c

   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);