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/clkdev.h> 11 #include <linux/err.h> 12 #include <linux/io.h> 13 #include <linux/platform_data/clk-integrator.h> 14 15 #include "clk-icst.h" 16 17 #define IMPD1_OSC1 0x00 18 #define IMPD1_OSC2 0x04 19 #define IMPD1_LOCK 0x08 20 21 struct impd1_clk { 22 char *pclkname; 23 struct clk *pclk; 24 char *vco1name; 25 struct clk *vco1clk; 26 char *vco2name; 27 struct clk *vco2clk; 28 struct clk *mmciclk; 29 char *uartname; 30 struct clk *uartclk; 31 char *spiname; 32 struct clk *spiclk; 33 char *scname; 34 struct clk *scclk; 35 struct clk_lookup *clks[15]; 36 }; 37 38 /* One entry for each connected IM-PD1 LM */ 39 static struct impd1_clk impd1_clks[4]; 40 41 /* 42 * There are two VCO's on the IM-PD1 43 */ 44 45 static const struct icst_params impd1_vco1_params = { 46 .ref = 24000000, /* 24 MHz */ 47 .vco_max = ICST525_VCO_MAX_3V, 48 .vco_min = ICST525_VCO_MIN, 49 .vd_min = 12, 50 .vd_max = 519, 51 .rd_min = 3, 52 .rd_max = 120, 53 .s2div = icst525_s2div, 54 .idx2s = icst525_idx2s, 55 }; 56 57 static const struct clk_icst_desc impd1_icst1_desc = { 58 .params = &impd1_vco1_params, 59 .vco_offset = IMPD1_OSC1, 60 .lock_offset = IMPD1_LOCK, 61 }; 62 63 static const struct icst_params impd1_vco2_params = { 64 .ref = 24000000, /* 24 MHz */ 65 .vco_max = ICST525_VCO_MAX_3V, 66 .vco_min = ICST525_VCO_MIN, 67 .vd_min = 12, 68 .vd_max = 519, 69 .rd_min = 3, 70 .rd_max = 120, 71 .s2div = icst525_s2div, 72 .idx2s = icst525_idx2s, 73 }; 74 75 static const struct clk_icst_desc impd1_icst2_desc = { 76 .params = &impd1_vco2_params, 77 .vco_offset = IMPD1_OSC2, 78 .lock_offset = IMPD1_LOCK, 79 }; 80 81 /** 82 * integrator_impd1_clk_init() - set up the integrator clock tree 83 * @base: base address of the logic module (LM) 84 * @id: the ID of this LM 85 */ 86 void integrator_impd1_clk_init(void __iomem *base, unsigned int id) 87 { 88 struct impd1_clk *imc; 89 struct clk *clk; 90 struct clk *pclk; 91 int i; 92 93 if (id > 3) { 94 pr_crit("no more than 4 LMs can be attached\n"); 95 return; 96 } 97 imc = &impd1_clks[id]; 98 99 /* Register the fixed rate PCLK */ 100 imc->pclkname = kasprintf(GFP_KERNEL, "lm%x-pclk", id); 101 pclk = clk_register_fixed_rate(NULL, imc->pclkname, NULL, 0, 0); 102 imc->pclk = pclk; 103 104 imc->vco1name = kasprintf(GFP_KERNEL, "lm%x-vco1", id); 105 clk = icst_clk_register(NULL, &impd1_icst1_desc, imc->vco1name, NULL, 106 base); 107 imc->vco1clk = clk; 108 imc->clks[0] = clkdev_alloc(pclk, "apb_pclk", "lm%x:01000", id); 109 imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:01000", id); 110 111 /* VCO2 is also called "CLK2" */ 112 imc->vco2name = kasprintf(GFP_KERNEL, "lm%x-vco2", id); 113 clk = icst_clk_register(NULL, &impd1_icst2_desc, imc->vco2name, NULL, 114 base); 115 imc->vco2clk = clk; 116 117 /* MMCI uses CLK2 right off */ 118 imc->clks[2] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00700", id); 119 imc->clks[3] = clkdev_alloc(clk, NULL, "lm%x:00700", id); 120 121 /* UART reference clock divides CLK2 by a fixed factor 4 */ 122 imc->uartname = kasprintf(GFP_KERNEL, "lm%x-uartclk", id); 123 clk = clk_register_fixed_factor(NULL, imc->uartname, imc->vco2name, 124 CLK_IGNORE_UNUSED, 1, 4); 125 imc->uartclk = clk; 126 imc->clks[4] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00100", id); 127 imc->clks[5] = clkdev_alloc(clk, NULL, "lm%x:00100", id); 128 imc->clks[6] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00200", id); 129 imc->clks[7] = clkdev_alloc(clk, NULL, "lm%x:00200", id); 130 131 /* SPI PL022 clock divides CLK2 by a fixed factor 64 */ 132 imc->spiname = kasprintf(GFP_KERNEL, "lm%x-spiclk", id); 133 clk = clk_register_fixed_factor(NULL, imc->spiname, imc->vco2name, 134 CLK_IGNORE_UNUSED, 1, 64); 135 imc->clks[8] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00300", id); 136 imc->clks[9] = clkdev_alloc(clk, NULL, "lm%x:00300", id); 137 138 /* The GPIO blocks and AACI have only PCLK */ 139 imc->clks[10] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00400", id); 140 imc->clks[11] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00500", id); 141 imc->clks[12] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00800", id); 142 143 /* Smart Card clock divides CLK2 by a fixed factor 4 */ 144 imc->scname = kasprintf(GFP_KERNEL, "lm%x-scclk", id); 145 clk = clk_register_fixed_factor(NULL, imc->scname, imc->vco2name, 146 CLK_IGNORE_UNUSED, 1, 4); 147 imc->scclk = clk; 148 imc->clks[13] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00600", id); 149 imc->clks[14] = clkdev_alloc(clk, NULL, "lm%x:00600", id); 150 151 for (i = 0; i < ARRAY_SIZE(imc->clks); i++) 152 clkdev_add(imc->clks[i]); 153 } 154 EXPORT_SYMBOL_GPL(integrator_impd1_clk_init); 155 156 void integrator_impd1_clk_exit(unsigned int id) 157 { 158 int i; 159 struct impd1_clk *imc; 160 161 if (id > 3) 162 return; 163 imc = &impd1_clks[id]; 164 165 for (i = 0; i < ARRAY_SIZE(imc->clks); i++) 166 clkdev_drop(imc->clks[i]); 167 clk_unregister(imc->spiclk); 168 clk_unregister(imc->uartclk); 169 clk_unregister(imc->vco2clk); 170 clk_unregister(imc->vco1clk); 171 clk_unregister(imc->pclk); 172 kfree(imc->scname); 173 kfree(imc->spiname); 174 kfree(imc->uartname); 175 kfree(imc->vco2name); 176 kfree(imc->vco1name); 177 kfree(imc->pclkname); 178 } 179 EXPORT_SYMBOL_GPL(integrator_impd1_clk_exit); 180