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/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 <linux/mfd/dbx500-prcmu.h>
  19 #include "clk.h"
  20
  21 /* Clock definitions for ab8500 */
  22 static int ab8500_reg_clks(struct device *dev)
  23 {
  24         int ret;
  25         struct clk *clk;
  26
  27         const char *intclk_parents[] = {"ab8500_sysclk", "ulpclk"};
  28         u16 intclk_reg_sel[] = {0 , AB8500_SYSULPCLKCTRL1};
  29         u8 intclk_reg_mask[] = {0 , AB8500_SYSULPCLKCTRL1_SYSULPCLKINTSEL_MASK};
  30         u8 intclk_reg_bits[] = {
  31                 0 ,
  32                 (1 << AB8500_SYSULPCLKCTRL1_SYSULPCLKINTSEL_SHIFT)
  33         };
  34
  35         dev_info(dev, "register clocks for ab850x\n");
  36
  37         /* Enable SWAT */
  38         ret = ab8500_sysctrl_set(AB8500_SWATCTRL, AB8500_SWATCTRL_SWATENABLE);
  39         if (ret)
  40                 return ret;
  41
  42         /* ab8500_sysclk */
  43         clk = clk_reg_prcmu_gate("ab8500_sysclk", NULL, PRCMU_SYSCLK, 0);
  44         clk_register_clkdev(clk, "sysclk", "ab8500-usb.0");
  45         clk_register_clkdev(clk, "sysclk", "ab-iddet.0");
  46         clk_register_clkdev(clk, "sysclk", "snd-soc-mop500.0");
  47         clk_register_clkdev(clk, "sysclk", "shrm_bus");
  48
  49         /* ab8500_sysclk2 */
  50         clk = clk_reg_sysctrl_gate(dev , "ab8500_sysclk2", "ab8500_sysclk",
  51                 AB8500_SYSULPCLKCTRL1, AB8500_SYSULPCLKCTRL1_SYSCLKBUF2REQ,
  52                 AB8500_SYSULPCLKCTRL1_SYSCLKBUF2REQ, 0, 0);
  53         clk_register_clkdev(clk, "sysclk", "0-0070");
  54
  55         /* ab8500_sysclk3 */
  56         clk = clk_reg_sysctrl_gate(dev , "ab8500_sysclk3", "ab8500_sysclk",
  57                 AB8500_SYSULPCLKCTRL1, AB8500_SYSULPCLKCTRL1_SYSCLKBUF3REQ,
  58                 AB8500_SYSULPCLKCTRL1_SYSCLKBUF3REQ, 0, 0);
  59         clk_register_clkdev(clk, "sysclk", "cg1960_core.0");
  60
  61         /* ab8500_sysclk4 */
  62         clk = clk_reg_sysctrl_gate(dev , "ab8500_sysclk4", "ab8500_sysclk",
  63                 AB8500_SYSULPCLKCTRL1, AB8500_SYSULPCLKCTRL1_SYSCLKBUF4REQ,
  64                 AB8500_SYSULPCLKCTRL1_SYSCLKBUF4REQ, 0, 0);
  65
  66         /* ab_ulpclk */
  67         clk = clk_reg_sysctrl_gate_fixed_rate(dev, "ulpclk", NULL,
  68                 AB8500_SYSULPCLKCTRL1, AB8500_SYSULPCLKCTRL1_ULPCLKREQ,
  69                 AB8500_SYSULPCLKCTRL1_ULPCLKREQ,
  70                 38400000, 9000, 0);
  71         clk_register_clkdev(clk, "ulpclk", "snd-soc-mop500.0");
  72
  73         /* ab8500_intclk */
  74         clk = clk_reg_sysctrl_set_parent(dev , "intclk", intclk_parents, 2,
  75                 intclk_reg_sel, intclk_reg_mask, intclk_reg_bits, 0);
  76         clk_register_clkdev(clk, "intclk", "snd-soc-mop500.0");
  77         clk_register_clkdev(clk, NULL, "ab8500-pwm.1");
  78
  79         /* ab8500_audioclk */
  80         clk = clk_reg_sysctrl_gate(dev , "audioclk", "intclk",
  81                 AB8500_SYSULPCLKCTRL1, AB8500_SYSULPCLKCTRL1_AUDIOCLKENA,
  82                 AB8500_SYSULPCLKCTRL1_AUDIOCLKENA, 0, 0);
  83         clk_register_clkdev(clk, "audioclk", "ab8500-codec.0");
  84
  85         return 0;
  86 }
  87
  88 /* Clock definitions for ab8540 */
  89 static int ab8540_reg_clks(struct device *dev)
  90 {
  91         return 0;
  92 }
  93
  94 /* Clock definitions for ab9540 */
  95 static int ab9540_reg_clks(struct device *dev)
  96 {
  97         return 0;
  98 }
  99
 100 static int abx500_clk_probe(struct platform_device *pdev)
 101 {
 102         struct ab8500 *parent = dev_get_drvdata(pdev->dev.parent);
 103         int ret;
 104
 105         if (is_ab8500(parent) || is_ab8505(parent)) {
 106                 ret = ab8500_reg_clks(&pdev->dev);
 107         } else if (is_ab8540(parent)) {
 108                 ret = ab8540_reg_clks(&pdev->dev);
 109         } else if (is_ab9540(parent)) {
 110                 ret = ab9540_reg_clks(&pdev->dev);
 111         } else {
 112                 dev_err(&pdev->dev, "non supported plf id\n");
 113                 return -ENODEV;
 114         }
 115
 116         return ret;
 117 }
 118
 119 static struct platform_driver abx500_clk_driver = {
 120         .driver = {
 121                 .name = "abx500-clk",
 122         },
 123         .probe  = abx500_clk_probe,
 124 };
 125
 126 static int __init abx500_clk_init(void)
 127 {
 128         return platform_driver_register(&abx500_clk_driver);
 129 }
 130
 131 arch_initcall(abx500_clk_init);
 132
 133 MODULE_AUTHOR("Ulf Hansson <ulf.hansson@linaro.org");
 134 MODULE_DESCRIPTION("ABX500 clk driver");
 135 MODULE_LICENSE("GPL v2");