1 /* 2 * Clock driver for the ARM Integrator/IM-PD1 board 3 * Copyright (C) 2012-2013 Linus Walleij 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 #include <linux/clk-provider.h> 10 #include <linux/clk.h> 11 #include <linux/clkdev.h> 12 #include <linux/err.h> 13 #include <linux/io.h> 14 #include <linux/platform_data/clk-integrator.h> 15 16 #include "clk-icst.h" 17 18 #define IMPD1_OSC1 0x00 19 #define IMPD1_OSC2 0x04 20 #define IMPD1_LOCK 0x08 21 22 struct impd1_clk { 23 char *vco1name; 24 struct clk *vco1clk; 25 char *vco2name; 26 struct clk *vco2clk; 27 struct clk *mmciclk; 28 char *uartname; 29 struct clk *uartclk; 30 char *spiname; 31 struct clk *spiclk; 32 char *scname; 33 struct clk *scclk; 34 struct clk_lookup *clks[6]; 35 }; 36 37 /* One entry for each connected IM-PD1 LM */ 38 static struct impd1_clk impd1_clks[4]; 39 40 /* 41 * There are two VCO's on the IM-PD1 42 */ 43 44 static const struct icst_params impd1_vco1_params = { 45 .ref = 24000000, /* 24 MHz */ 46 .vco_max = ICST525_VCO_MAX_3V, 47 .vco_min = ICST525_VCO_MIN, 48 .vd_min = 12, 49 .vd_max = 519, 50 .rd_min = 3, 51 .rd_max = 120, 52 .s2div = icst525_s2div, 53 .idx2s = icst525_idx2s, 54 }; 55 56 static const struct clk_icst_desc impd1_icst1_desc = { 57 .params = &impd1_vco1_params, 58 .vco_offset = IMPD1_OSC1, 59 .lock_offset = IMPD1_LOCK, 60 }; 61 62 static const struct icst_params impd1_vco2_params = { 63 .ref = 24000000, /* 24 MHz */ 64 .vco_max = ICST525_VCO_MAX_3V, 65 .vco_min = ICST525_VCO_MIN, 66 .vd_min = 12, 67 .vd_max = 519, 68 .rd_min = 3, 69 .rd_max = 120, 70 .s2div = icst525_s2div, 71 .idx2s = icst525_idx2s, 72 }; 73 74 static const struct clk_icst_desc impd1_icst2_desc = { 75 .params = &impd1_vco2_params, 76 .vco_offset = IMPD1_OSC2, 77 .lock_offset = IMPD1_LOCK, 78 }; 79 80 /** 81 * integrator_impd1_clk_init() - set up the integrator clock tree 82 * @base: base address of the logic module (LM) 83 * @id: the ID of this LM 84 */ 85 void integrator_impd1_clk_init(void __iomem *base, unsigned int id) 86 { 87 struct impd1_clk *imc; 88 struct clk *clk; 89 int i; 90 91 if (id > 3) { 92 pr_crit("no more than 4 LMs can be attached\n"); 93 return; 94 } 95 imc = &impd1_clks[id]; 96 97 imc->vco1name = kasprintf(GFP_KERNEL, "lm%x-vco1", id); 98 clk = icst_clk_register(NULL, &impd1_icst1_desc, imc->vco1name, NULL, 99 base); 100 imc->vco1clk = clk; 101 imc->clks[0] = clkdev_alloc(clk, NULL, "lm%x:01000", id); 102 103 /* VCO2 is also called "CLK2" */ 104 imc->vco2name = kasprintf(GFP_KERNEL, "lm%x-vco2", id); 105 clk = icst_clk_register(NULL, &impd1_icst2_desc, imc->vco2name, NULL, 106 base); 107 imc->vco2clk = clk; 108 109 /* MMCI uses CLK2 right off */ 110 imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:00700", id); 111 112 /* UART reference clock divides CLK2 by a fixed factor 4 */ 113 imc->uartname = kasprintf(GFP_KERNEL, "lm%x-uartclk", id); 114 clk = clk_register_fixed_factor(NULL, imc->uartname, imc->vco2name, 115 CLK_IGNORE_UNUSED, 1, 4); 116 imc->uartclk = clk; 117 imc->clks[2] = clkdev_alloc(clk, NULL, "lm%x:00100", id); 118 imc->clks[3] = clkdev_alloc(clk, NULL, "lm%x:00200", id); 119 120 /* SPI PL022 clock divides CLK2 by a fixed factor 64 */ 121 imc->spiname = kasprintf(GFP_KERNEL, "lm%x-spiclk", id); 122 clk = clk_register_fixed_factor(NULL, imc->spiname, imc->vco2name, 123 CLK_IGNORE_UNUSED, 1, 64); 124 imc->clks[4] = clkdev_alloc(clk, NULL, "lm%x:00300", id); 125 126 /* Smart Card clock divides CLK2 by a fixed factor 4 */ 127 imc->scname = kasprintf(GFP_KERNEL, "lm%x-scclk", id); 128 clk = clk_register_fixed_factor(NULL, imc->scname, imc->vco2name, 129 CLK_IGNORE_UNUSED, 1, 4); 130 imc->scclk = clk; 131 imc->clks[5] = clkdev_alloc(clk, NULL, "lm%x:00600", id); 132 133 for (i = 0; i < ARRAY_SIZE(imc->clks); i++) 134 clkdev_add(imc->clks[i]); 135 } 136 EXPORT_SYMBOL_GPL(integrator_impd1_clk_init); 137 138 void integrator_impd1_clk_exit(unsigned int id) 139 { 140 int i; 141 struct impd1_clk *imc; 142 143 if (id > 3) 144 return; 145 imc = &impd1_clks[id]; 146 147 for (i = 0; i < ARRAY_SIZE(imc->clks); i++) 148 clkdev_drop(imc->clks[i]); 149 clk_unregister(imc->spiclk); 150 clk_unregister(imc->uartclk); 151 clk_unregister(imc->vco2clk); 152 clk_unregister(imc->vco1clk); 153 kfree(imc->scname); 154 kfree(imc->spiname); 155 kfree(imc->uartname); 156 kfree(imc->vco2name); 157 kfree(imc->vco1name); 158 } 159 EXPORT_SYMBOL_GPL(integrator_impd1_clk_exit); 160