drivers/clk/ux500/abx500-clk.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * abx500 clock implementation for ux500 platform.
   4  *
   5  * Copyright (C) 2012 ST-Ericsson SA
   6  * Author: Ulf Hansson <ulf.hansson@linaro.org>
   7  */
   8
   9 #include <linux/err.h>
  10 #include <linux/module.h>
  11 #include <linux/device.h>
  12 #include <linux/of.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/mfd/abx500/ab8500.h>
  15 #include <linux/mfd/abx500/ab8500-sysctrl.h>
  16 #include <linux/clkdev.h>
  17 #include <linux/clk-provider.h>
  18 #include <dt-bindings/clock/ste-ab8500.h>
  19 #include "clk.h"
  20
  21 #define AB8500_NUM_CLKS 6
  22
  23 static struct clk *ab8500_clks[AB8500_NUM_CLKS];
  24 static struct clk_onecell_data ab8500_clk_data;
  25
  26 /* Clock definitions for ab8500 */
  27 static int ab8500_reg_clks(struct device *dev)
  28 {
  29         int ret;
  30         struct clk *clk;
  31         struct device_node *np = dev->of_node;
  32         const char *intclk_parents[] = {"ab8500_sysclk", "ulpclk"};
  33         u16 intclk_reg_sel[] = {0 , AB8500_SYSULPCLKCTRL1};
  34         u8 intclk_reg_mask[] = {0 , AB8500_SYSULPCLKCTRL1_SYSULPCLKINTSEL_MASK};
  35         u8 intclk_reg_bits[] = {
  36                 0 ,
  37                 (1 << AB8500_SYSULPCLKCTRL1_SYSULPCLKINTSEL_SHIFT)
  38         };
  39
  40         /* Enable SWAT */
  41         ret = ab8500_sysctrl_set(AB8500_SWATCTRL, AB8500_SWATCTRL_SWATENABLE);
  42         if (ret)
  43                 return ret;
  44
  45         /* ab8500_sysclk2 */
  46         clk = clk_reg_sysctrl_gate(dev , "ab8500_sysclk2", "ab8500_sysclk",
  47                 AB8500_SYSULPCLKCTRL1, AB8500_SYSULPCLKCTRL1_SYSCLKBUF2REQ,
  48                 AB8500_SYSULPCLKCTRL1_SYSCLKBUF2REQ, 0, 0);
  49         ab8500_clks[AB8500_SYSCLK_BUF2] = clk;
  50
  51         /* ab8500_sysclk3 */
  52         clk = clk_reg_sysctrl_gate(dev , "ab8500_sysclk3", "ab8500_sysclk",
  53                 AB8500_SYSULPCLKCTRL1, AB8500_SYSULPCLKCTRL1_SYSCLKBUF3REQ,
  54                 AB8500_SYSULPCLKCTRL1_SYSCLKBUF3REQ, 0, 0);
  55         ab8500_clks[AB8500_SYSCLK_BUF3] = clk;
  56
  57         /* ab8500_sysclk4 */
  58         clk = clk_reg_sysctrl_gate(dev , "ab8500_sysclk4", "ab8500_sysclk",
  59                 AB8500_SYSULPCLKCTRL1, AB8500_SYSULPCLKCTRL1_SYSCLKBUF4REQ,
  60                 AB8500_SYSULPCLKCTRL1_SYSCLKBUF4REQ, 0, 0);
  61         ab8500_clks[AB8500_SYSCLK_BUF4] = clk;
  62
  63         /* ab_ulpclk */
  64         clk = clk_reg_sysctrl_gate_fixed_rate(dev, "ulpclk", NULL,
  65                 AB8500_SYSULPCLKCTRL1, AB8500_SYSULPCLKCTRL1_ULPCLKREQ,
  66                 AB8500_SYSULPCLKCTRL1_ULPCLKREQ,
  67                 38400000, 9000, 0);
  68         ab8500_clks[AB8500_SYSCLK_ULP] = clk;
  69
  70         /* ab8500_intclk */
  71         clk = clk_reg_sysctrl_set_parent(dev , "intclk", intclk_parents, 2,
  72                 intclk_reg_sel, intclk_reg_mask, intclk_reg_bits, 0);
  73         ab8500_clks[AB8500_SYSCLK_INT] = clk;
  74
  75         /* ab8500_audioclk */
  76         clk = clk_reg_sysctrl_gate(dev , "audioclk", "intclk",
  77                 AB8500_SYSULPCLKCTRL1, AB8500_SYSULPCLKCTRL1_AUDIOCLKENA,
  78                 AB8500_SYSULPCLKCTRL1_AUDIOCLKENA, 0, 0);
  79         ab8500_clks[AB8500_SYSCLK_AUDIO] = clk;
  80
  81         ab8500_clk_data.clks = ab8500_clks;
  82         ab8500_clk_data.clk_num = ARRAY_SIZE(ab8500_clks);
  83         of_clk_add_provider(np, of_clk_src_onecell_get, &ab8500_clk_data);
  84
  85         dev_info(dev, "registered clocks for ab850x\n");
  86
  87         return 0;
  88 }
  89
  90 static int abx500_clk_probe(struct platform_device *pdev)
  91 {
  92         struct ab8500 *parent = dev_get_drvdata(pdev->dev.parent);
  93         int ret;
  94
  95         if (is_ab8500(parent) || is_ab8505(parent)) {
  96                 ret = ab8500_reg_clks(&pdev->dev);
  97         } else {
  98                 dev_err(&pdev->dev, "non supported plf id\n");
  99                 return -ENODEV;
 100         }
 101
 102         return ret;
 103 }
 104
 105 static const struct of_device_id abx500_clk_match[] = {
 106         { .compatible = "stericsson,ab8500-clk", },
 107         {}
 108 };
 109
 110 static struct platform_driver abx500_clk_driver = {
 111         .driver = {
 112                 .name = "abx500-clk",
 113                 .of_match_table = abx500_clk_match,
 114         },
 115         .probe  = abx500_clk_probe,
 116 };
 117
 118 static int __init abx500_clk_init(void)
 119 {
 120         return platform_driver_register(&abx500_clk_driver);
 121 }
 122 arch_initcall(abx500_clk_init);
 123
 124 MODULE_AUTHOR("Ulf Hansson <ulf.hansson@linaro.org");
 125 MODULE_DESCRIPTION("ABX500 clk driver");
 126 MODULE_LICENSE("GPL v2");