drivers/clk/ux500/abx500-clk.c

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