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 *pclkname; 24 struct clk *pclk; 25 char *vco1name; 26 struct clk *vco1clk; 27 char *vco2name; 28 struct clk *vco2clk; 29 struct clk *mmciclk; 30 char *uartname; 31 struct clk *uartclk; 32 char *spiname; 33 struct clk *spiclk; 34 char *scname; 35 struct clk *scclk; 36 struct clk_lookup *clks[15]; 37 }; 38 39 /* One entry for each connected IM-PD1 LM */ 40 static struct impd1_clk impd1_clks[4]; 41 42 /* 43 * There are two VCO's on the IM-PD1 44 */ 45 46 static const struct icst_params impd1_vco1_params = { 47 .ref = 24000000, /* 24 MHz */ 48 .vco_max = ICST525_VCO_MAX_3V, 49 .vco_min = ICST525_VCO_MIN, 50 .vd_min = 12, 51 .vd_max = 519, 52 .rd_min = 3, 53 .rd_max = 120, 54 .s2div = icst525_s2div, 55 .idx2s = icst525_idx2s, 56 }; 57 58 static const struct clk_icst_desc impd1_icst1_desc = { 59 .params = &impd1_vco1_params, 60 .vco_offset = IMPD1_OSC1, 61 .lock_offset = IMPD1_LOCK, 62 }; 63 64 static const struct icst_params impd1_vco2_params = { 65 .ref = 24000000, /* 24 MHz */ 66 .vco_max = ICST525_VCO_MAX_3V, 67 .vco_min = ICST525_VCO_MIN, 68 .vd_min = 12, 69 .vd_max = 519, 70 .rd_min = 3, 71 .rd_max = 120, 72 .s2div = icst525_s2div, 73 .idx2s = icst525_idx2s, 74 }; 75 76 static const struct clk_icst_desc impd1_icst2_desc = { 77 .params = &impd1_vco2_params, 78 .vco_offset = IMPD1_OSC2, 79 .lock_offset = IMPD1_LOCK, 80 }; 81 82 /** 83 * integrator_impd1_clk_init() - set up the integrator clock tree 84 * @base: base address of the logic module (LM) 85 * @id: the ID of this LM 86 */ 87 void integrator_impd1_clk_init(void __iomem *base, unsigned int id) 88 { 89 struct impd1_clk *imc; 90 struct clk *clk; 91 struct clk *pclk; 92 int i; 93 94 if (id > 3) { 95 pr_crit("no more than 4 LMs can be attached\n"); 96 return; 97 } 98 imc = &impd1_clks[id]; 99 100 /* Register the fixed rate PCLK */ 101 imc->pclkname = kasprintf(GFP_KERNEL, "lm%x-pclk", id); 102 pclk = clk_register_fixed_rate(NULL, imc->pclkname, NULL, 103 CLK_IS_ROOT, 0); 104 imc->pclk = pclk; 105 106 imc->vco1name = kasprintf(GFP_KERNEL, "lm%x-vco1", id); 107 clk = icst_clk_register(NULL, &impd1_icst1_desc, imc->vco1name, NULL, 108 base); 109 imc->vco1clk = clk; 110 imc->clks[0] = clkdev_alloc(pclk, "apb_pclk", "lm%x:01000", id); 111 imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:01000", id); 112 113 /* VCO2 is also called "CLK2" */ 114 imc->vco2name = kasprintf(GFP_KERNEL, "lm%x-vco2", id); 115 clk = icst_clk_register(NULL, &impd1_icst2_desc, imc->vco2name, NULL, 116 base); 117 imc->vco2clk = clk; 118 119 /* MMCI uses CLK2 right off */ 120 imc->clks[2] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00700", id); 121 imc->clks[3] = clkdev_alloc(clk, NULL, "lm%x:00700", id); 122 123 /* UART reference clock divides CLK2 by a fixed factor 4 */ 124 imc->uartname = kasprintf(GFP_KERNEL, "lm%x-uartclk", id); 125 clk = clk_register_fixed_factor(NULL, imc->uartname, imc->vco2name, 126 CLK_IGNORE_UNUSED, 1, 4); 127 imc->uartclk = clk; 128 imc->clks[4] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00100", id); 129 imc->clks[5] = clkdev_alloc(clk, NULL, "lm%x:00100", id); 130 imc->clks[6] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00200", id); 131 imc->clks[7] = clkdev_alloc(clk, NULL, "lm%x:00200", id); 132 133 /* SPI PL022 clock divides CLK2 by a fixed factor 64 */ 134 imc->spiname = kasprintf(GFP_KERNEL, "lm%x-spiclk", id); 135 clk = clk_register_fixed_factor(NULL, imc->spiname, imc->vco2name, 136 CLK_IGNORE_UNUSED, 1, 64); 137 imc->clks[8] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00300", id); 138 imc->clks[9] = clkdev_alloc(clk, NULL, "lm%x:00300", id); 139 140 /* The GPIO blocks and AACI have only PCLK */ 141 imc->clks[10] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00400", id); 142 imc->clks[11] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00500", id); 143 imc->clks[12] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00800", id); 144 145 /* Smart Card clock divides CLK2 by a fixed factor 4 */ 146 imc->scname = kasprintf(GFP_KERNEL, "lm%x-scclk", id); 147 clk = clk_register_fixed_factor(NULL, imc->scname, imc->vco2name, 148 CLK_IGNORE_UNUSED, 1, 4); 149 imc->scclk = clk; 150 imc->clks[13] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00600", id); 151 imc->clks[14] = clkdev_alloc(clk, NULL, "lm%x:00600", id); 152 153 for (i = 0; i < ARRAY_SIZE(imc->clks); i++) 154 clkdev_add(imc->clks[i]); 155 } 156 EXPORT_SYMBOL_GPL(integrator_impd1_clk_init); 157 158 void integrator_impd1_clk_exit(unsigned int id) 159 { 160 int i; 161 struct impd1_clk *imc; 162 163 if (id > 3) 164 return; 165 imc = &impd1_clks[id]; 166 167 for (i = 0; i < ARRAY_SIZE(imc->clks); i++) 168 clkdev_drop(imc->clks[i]); 169 clk_unregister(imc->spiclk); 170 clk_unregister(imc->uartclk); 171 clk_unregister(imc->vco2clk); 172 clk_unregister(imc->vco1clk); 173 clk_unregister(imc->pclk); 174 kfree(imc->scname); 175 kfree(imc->spiname); 176 kfree(imc->uartname); 177 kfree(imc->vco2name); 178 kfree(imc->vco1name); 179 kfree(imc->pclkname); 180 } 181 EXPORT_SYMBOL_GPL(integrator_impd1_clk_exit); 182