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 <mach/impd1.h> 17 18 #include "clk-icst.h" 19 20 struct impd1_clk { 21 char *vco1name; 22 struct clk *vco1clk; 23 char *vco2name; 24 struct clk *vco2clk; 25 struct clk *mmciclk; 26 char *uartname; 27 struct clk *uartclk; 28 char *spiname; 29 struct clk *spiclk; 30 char *scname; 31 struct clk *scclk; 32 struct clk_lookup *clks[6]; 33 }; 34 35 /* One entry for each connected IM-PD1 LM */ 36 static struct impd1_clk impd1_clks[4]; 37 38 /* 39 * There are two VCO's on the IM-PD1 40 */ 41 42 static const struct icst_params impd1_vco1_params = { 43 .ref = 24000000, /* 24 MHz */ 44 .vco_max = ICST525_VCO_MAX_3V, 45 .vco_min = ICST525_VCO_MIN, 46 .vd_min = 12, 47 .vd_max = 519, 48 .rd_min = 3, 49 .rd_max = 120, 50 .s2div = icst525_s2div, 51 .idx2s = icst525_idx2s, 52 }; 53 54 static const struct clk_icst_desc impd1_icst1_desc = { 55 .params = &impd1_vco1_params, 56 .vco_offset = IMPD1_OSC1, 57 .lock_offset = IMPD1_LOCK, 58 }; 59 60 static const struct icst_params impd1_vco2_params = { 61 .ref = 24000000, /* 24 MHz */ 62 .vco_max = ICST525_VCO_MAX_3V, 63 .vco_min = ICST525_VCO_MIN, 64 .vd_min = 12, 65 .vd_max = 519, 66 .rd_min = 3, 67 .rd_max = 120, 68 .s2div = icst525_s2div, 69 .idx2s = icst525_idx2s, 70 }; 71 72 static const struct clk_icst_desc impd1_icst2_desc = { 73 .params = &impd1_vco2_params, 74 .vco_offset = IMPD1_OSC2, 75 .lock_offset = IMPD1_LOCK, 76 }; 77 78 /** 79 * integrator_impd1_clk_init() - set up the integrator clock tree 80 * @base: base address of the logic module (LM) 81 * @id: the ID of this LM 82 */ 83 void integrator_impd1_clk_init(void __iomem *base, unsigned int id) 84 { 85 struct impd1_clk *imc; 86 struct clk *clk; 87 int i; 88 89 if (id > 3) { 90 pr_crit("no more than 4 LMs can be attached\n"); 91 return; 92 } 93 imc = &impd1_clks[id]; 94 95 imc->vco1name = kasprintf(GFP_KERNEL, "lm%x-vco1", id); 96 clk = icst_clk_register(NULL, &impd1_icst1_desc, imc->vco1name, base); 97 imc->vco1clk = clk; 98 imc->clks[0] = clkdev_alloc(clk, NULL, "lm%x:01000", id); 99 100 /* VCO2 is also called "CLK2" */ 101 imc->vco2name = kasprintf(GFP_KERNEL, "lm%x-vco2", id); 102 clk = icst_clk_register(NULL, &impd1_icst2_desc, imc->vco2name, base); 103 imc->vco2clk = clk; 104 105 /* MMCI uses CLK2 right off */ 106 imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:00700", id); 107 108 /* UART reference clock divides CLK2 by a fixed factor 4 */ 109 imc->uartname = kasprintf(GFP_KERNEL, "lm%x-uartclk", id); 110 clk = clk_register_fixed_factor(NULL, imc->uartname, imc->vco2name, 111 CLK_IGNORE_UNUSED, 1, 4); 112 imc->uartclk = clk; 113 imc->clks[2] = clkdev_alloc(clk, NULL, "lm%x:00100", id); 114 imc->clks[3] = clkdev_alloc(clk, NULL, "lm%x:00200", id); 115 116 /* SPI PL022 clock divides CLK2 by a fixed factor 64 */ 117 imc->spiname = kasprintf(GFP_KERNEL, "lm%x-spiclk", id); 118 clk = clk_register_fixed_factor(NULL, imc->spiname, imc->vco2name, 119 CLK_IGNORE_UNUSED, 1, 64); 120 imc->clks[4] = clkdev_alloc(clk, NULL, "lm%x:00300", id); 121 122 /* Smart Card clock divides CLK2 by a fixed factor 4 */ 123 imc->scname = kasprintf(GFP_KERNEL, "lm%x-scclk", id); 124 clk = clk_register_fixed_factor(NULL, imc->scname, imc->vco2name, 125 CLK_IGNORE_UNUSED, 1, 4); 126 imc->scclk = clk; 127 imc->clks[5] = clkdev_alloc(clk, NULL, "lm%x:00600", id); 128 129 for (i = 0; i < ARRAY_SIZE(imc->clks); i++) 130 clkdev_add(imc->clks[i]); 131 } 132 133 void integrator_impd1_clk_exit(unsigned int id) 134 { 135 int i; 136 struct impd1_clk *imc; 137 138 if (id > 3) 139 return; 140 imc = &impd1_clks[id]; 141 142 for (i = 0; i < ARRAY_SIZE(imc->clks); i++) 143 clkdev_drop(imc->clks[i]); 144 clk_unregister(imc->spiclk); 145 clk_unregister(imc->uartclk); 146 clk_unregister(imc->vco2clk); 147 clk_unregister(imc->vco1clk); 148 kfree(imc->scname); 149 kfree(imc->spiname); 150 kfree(imc->uartname); 151 kfree(imc->vco2name); 152 kfree(imc->vco1name); 153 } 154