drivers/clk/qcom/hfpll.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2018, The Linux Foundation. All rights reserved.
   3
   4 #include <linux/kernel.h>
   5 #include <linux/init.h>
   6 #include <linux/module.h>
   7 #include <linux/platform_device.h>
   8 #include <linux/of.h>
   9 #include <linux/clk.h>
  10 #include <linux/clk-provider.h>
  11 #include <linux/regmap.h>
  12
  13 #include "clk-regmap.h"
  14 #include "clk-hfpll.h"
  15
  16 static const struct hfpll_data hdata = {
  17         .mode_reg = 0x00,
  18         .l_reg = 0x04,
  19         .m_reg = 0x08,
  20         .n_reg = 0x0c,
  21         .user_reg = 0x10,
  22         .config_reg = 0x14,
  23         .config_val = 0x430405d,
  24         .status_reg = 0x1c,
  25         .lock_bit = 16,
  26
  27         .user_val = 0x8,
  28         .user_vco_mask = 0x100000,
  29         .low_vco_max_rate = 1248000000,
  30         .min_rate = 537600000UL,
  31         .max_rate = 2900000000UL,
  32 };
  33
  34 static const struct of_device_id qcom_hfpll_match_table[] = {
  35         { .compatible = "qcom,hfpll" },
  36         { }
  37 };
  38 MODULE_DEVICE_TABLE(of, qcom_hfpll_match_table);
  39
  40 static const struct regmap_config hfpll_regmap_config = {
  41         .reg_bits       = 32,
  42         .reg_stride     = 4,
  43         .val_bits       = 32,
  44         .max_register   = 0x30,
  45         .fast_io        = true,
  46 };
  47
  48 static int qcom_hfpll_probe(struct platform_device *pdev)
  49 {
  50         struct device *dev = &pdev->dev;
  51         void __iomem *base;
  52         struct regmap *regmap;
  53         struct clk_hfpll *h;
  54         struct clk_init_data init = {
  55                 .num_parents = 1,
  56                 .ops = &clk_ops_hfpll,
  57                 /*
  58                  * rather than marking the clock critical and forcing the clock
  59                  * to be always enabled, we make sure that the clock is not
  60                  * disabled: the firmware remains responsible of enabling this
  61                  * clock (for more info check the commit log)
  62                  */
  63                 .flags = CLK_IGNORE_UNUSED,
  64         };
  65         int ret;
  66         struct clk_parent_data pdata = { .index = 0 };
  67
  68         h = devm_kzalloc(dev, sizeof(*h), GFP_KERNEL);
  69         if (!h)
  70                 return -ENOMEM;
  71
  72         base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
  73         if (IS_ERR(base))
  74                 return PTR_ERR(base);
  75
  76         regmap = devm_regmap_init_mmio(&pdev->dev, base, &hfpll_regmap_config);
  77         if (IS_ERR(regmap))
  78                 return PTR_ERR(regmap);
  79
  80         if (of_property_read_string_index(dev->of_node, "clock-output-names",
  81                                           0, &init.name))
  82                 return -ENODEV;
  83
  84         init.parent_data = &pdata;
  85
  86         h->d = &hdata;
  87         h->clkr.hw.init = &init;
  88         spin_lock_init(&h->lock);
  89
  90         ret = devm_clk_register_regmap(dev, &h->clkr);
  91         if (ret) {
  92                 dev_err(dev, "failed to register regmap clock: %d\n", ret);
  93                 return ret;
  94         }
  95
  96         return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
  97                                            &h->clkr.hw);
  98 }
  99
 100 static struct platform_driver qcom_hfpll_driver = {
 101         .probe          = qcom_hfpll_probe,
 102         .driver         = {
 103                 .name   = "qcom-hfpll",
 104                 .of_match_table = qcom_hfpll_match_table,
 105         },
 106 };
 107 module_platform_driver(qcom_hfpll_driver);
 108
 109 MODULE_DESCRIPTION("QCOM HFPLL Clock Driver");
 110 MODULE_LICENSE("GPL v2");
 111 MODULE_ALIAS("platform:qcom-hfpll");