drivers/clk/actions/owl-common.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // OWL common clock driver
   4 //
   5 // Copyright (c) 2014 Actions Semi Inc.
   6 // Author: David Liu <liuwei@actions-semi.com>
   7 //
   8 // Copyright (c) 2018 Linaro Ltd.
   9 // Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
  10
  11 #include <linux/of_address.h>
  12 #include <linux/of_platform.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/regmap.h>
  15
  16 #include "owl-common.h"
  17
  18 static const struct regmap_config owl_regmap_config = {
  19         .reg_bits       = 32,
  20         .reg_stride     = 4,
  21         .val_bits       = 32,
  22         .max_register   = 0x00cc,
  23         .fast_io        = true,
  24 };
  25
  26 static void owl_clk_set_regmap(const struct owl_clk_desc *desc,
  27                          struct regmap *regmap)
  28 {
  29         int i;
  30         struct owl_clk_common *clks;
  31
  32         for (i = 0; i < desc->num_clks; i++) {
  33                 clks = desc->clks[i];
  34                 if (!clks)
  35                         continue;
  36
  37                 clks->regmap = regmap;
  38         }
  39 }
  40
  41 int owl_clk_regmap_init(struct platform_device *pdev,
  42                         struct owl_clk_desc *desc)
  43 {
  44         void __iomem *base;
  45         struct regmap *regmap;
  46         struct resource *res;
  47
  48         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  49         base = devm_ioremap_resource(&pdev->dev, res);
  50         if (IS_ERR(base))
  51                 return PTR_ERR(base);
  52
  53         regmap = devm_regmap_init_mmio(&pdev->dev, base, &owl_regmap_config);
  54         if (IS_ERR(regmap)) {
  55                 pr_err("failed to init regmap\n");
  56                 return PTR_ERR(regmap);
  57         }
  58
  59         owl_clk_set_regmap(desc, regmap);
  60         desc->regmap = regmap;
  61
  62         return 0;
  63 }
  64
  65 int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks)
  66 {
  67         int i, ret;
  68         struct clk_hw *hw;
  69
  70         for (i = 0; i < hw_clks->num; i++) {
  71                 const char *name;
  72
  73                 hw = hw_clks->hws[i];
  74                 if (IS_ERR_OR_NULL(hw))
  75                         continue;
  76
  77                 name = hw->init->name;
  78                 ret = devm_clk_hw_register(dev, hw);
  79                 if (ret) {
  80                         dev_err(dev, "Couldn't register clock %d - %s\n",
  81                                 i, name);
  82                         return ret;
  83                 }
  84         }
  85
  86         ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_clks);
  87         if (ret)
  88                 dev_err(dev, "Failed to add clock provider\n");
  89
  90         return ret;
  91 }