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"); 136