1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Clock driver for the ARM Integrator/IM-PD1 board 4 * Copyright (C) 2012-2013 Linus Walleij 5 */ 6 #include <linux/clk-provider.h> 7 #include <linux/clkdev.h> 8 #include <linux/err.h> 9 #include <linux/io.h> 10 #include <linux/platform_data/clk-integrator.h> 11 12 #include "icst.h" 13 #include "clk-icst.h" 14 15 #define IMPD1_OSC1 0x00 16 #define IMPD1_OSC2 0x04 17 #define IMPD1_LOCK 0x08 18 19 struct impd1_clk { 20 char *pclkname; 21 struct clk *pclk; 22 char *vco1name; 23 struct clk *vco1clk; 24 char *vco2name; 25 struct clk *vco2clk; 26 struct clk *mmciclk; 27 char *uartname; 28 struct clk *uartclk; 29 char *spiname; 30 struct clk *spiclk; 31 char *scname; 32 struct clk *scclk; 33 struct clk_lookup *clks[15]; 34 }; 35 36 /* One entry for each connected IM-PD1 LM */ 37 static struct impd1_clk impd1_clks[4]; 38 39 /* 40 * There are two VCO's on the IM-PD1 41 */ 42 43 static const struct icst_params impd1_vco1_params = { 44 .ref = 24000000, /* 24 MHz */ 45 .vco_max = ICST525_VCO_MAX_3V, 46 .vco_min = ICST525_VCO_MIN, 47 .vd_min = 12, 48 .vd_max = 519, 49 .rd_min = 3, 50 .rd_max = 120, 51 .s2div = icst525_s2div, 52 .idx2s = icst525_idx2s, 53 }; 54 55 static const struct clk_icst_desc impd1_icst1_desc = { 56 .params = &impd1_vco1_params, 57 .vco_offset = IMPD1_OSC1, 58 .lock_offset = IMPD1_LOCK, 59 }; 60 61 static const struct icst_params impd1_vco2_params = { 62 .ref = 24000000, /* 24 MHz */ 63 .vco_max = ICST525_VCO_MAX_3V, 64 .vco_min = ICST525_VCO_MIN, 65 .vd_min = 12, 66 .vd_max = 519, 67 .rd_min = 3, 68 .rd_max = 120, 69 .s2div = icst525_s2div, 70 .idx2s = icst525_idx2s, 71 }; 72 73 static const struct clk_icst_desc impd1_icst2_desc = { 74 .params = &impd1_vco2_params, 75 .vco_offset = IMPD1_OSC2, 76 .lock_offset = IMPD1_LOCK, 77 }; 78 79 /** 80 * integrator_impd1_clk_init() - set up the integrator clock tree 81 * @base: base address of the logic module (LM) 82 * @id: the ID of this LM 83 */ 84 void integrator_impd1_clk_init(void __iomem *base, unsigned int id) 85 { 86 struct impd1_clk *imc; 87 struct clk *clk; 88 struct clk *pclk; 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 /* Register the fixed rate PCLK */ 98 imc->pclkname = kasprintf(GFP_KERNEL, "lm%x-pclk", id); 99 pclk = clk_register_fixed_rate(NULL, imc->pclkname, NULL, 0, 0); 100 imc->pclk = pclk; 101 102 imc->vco1name = kasprintf(GFP_KERNEL, "lm%x-vco1", id); 103 clk = icst_clk_register(NULL, &impd1_icst1_desc, imc->vco1name, NULL, 104 base); 105 imc->vco1clk = clk; 106 imc->clks[0] = clkdev_alloc(pclk, "apb_pclk", "lm%x:01000", id); 107 imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:01000", id); 108 109 /* VCO2 is also called "CLK2" */ 110 imc->vco2name = kasprintf(GFP_KERNEL, "lm%x-vco2", id); 111 clk = icst_clk_register(NULL, &impd1_icst2_desc, imc->vco2name, NULL, 112 base); 113 imc->vco2clk = clk; 114 115 /* MMCI uses CLK2 right off */ 116 imc->clks[2] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00700", id); 117 imc->clks[3] = clkdev_alloc(clk, NULL, "lm%x:00700", id); 118 119 /* UART reference clock divides CLK2 by a fixed factor 4 */ 120 imc->uartname = kasprintf(GFP_KERNEL, "lm%x-uartclk", id); 121 clk = clk_register_fixed_factor(NULL, imc->uartname, imc->vco2name, 122 CLK_IGNORE_UNUSED, 1, 4); 123 imc->uartclk = clk; 124 imc->clks[4] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00100", id); 125 imc->clks[5] = clkdev_alloc(clk, NULL, "lm%x:00100", id); 126 imc->clks[6] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00200", id); 127 imc->clks[7] = clkdev_alloc(clk, NULL, "lm%x:00200", id); 128 129 /* SPI PL022 clock divides CLK2 by a fixed factor 64 */ 130 imc->spiname = kasprintf(GFP_KERNEL, "lm%x-spiclk", id); 131 clk = clk_register_fixed_factor(NULL, imc->spiname, imc->vco2name, 132 CLK_IGNORE_UNUSED, 1, 64); 133 imc->clks[8] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00300", id); 134 imc->clks[9] = clkdev_alloc(clk, NULL, "lm%x:00300", id); 135 136 /* The GPIO blocks and AACI have only PCLK */ 137 imc->clks[10] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00400", id); 138 imc->clks[11] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00500", id); 139 imc->clks[12] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00800", id); 140 141 /* Smart Card clock divides CLK2 by a fixed factor 4 */ 142 imc->scname = kasprintf(GFP_KERNEL, "lm%x-scclk", id); 143 clk = clk_register_fixed_factor(NULL, imc->scname, imc->vco2name, 144 CLK_IGNORE_UNUSED, 1, 4); 145 imc->scclk = clk; 146 imc->clks[13] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00600", id); 147 imc->clks[14] = clkdev_alloc(clk, NULL, "lm%x:00600", id); 148 149 for (i = 0; i < ARRAY_SIZE(imc->clks); i++) 150 clkdev_add(imc->clks[i]); 151 } 152 EXPORT_SYMBOL_GPL(integrator_impd1_clk_init); 153 154 void integrator_impd1_clk_exit(unsigned int id) 155 { 156 int i; 157 struct impd1_clk *imc; 158 159 if (id > 3) 160 return; 161 imc = &impd1_clks[id]; 162 163 for (i = 0; i < ARRAY_SIZE(imc->clks); i++) 164 clkdev_drop(imc->clks[i]); 165 clk_unregister(imc->spiclk); 166 clk_unregister(imc->uartclk); 167 clk_unregister(imc->vco2clk); 168 clk_unregister(imc->vco1clk); 169 clk_unregister(imc->pclk); 170 kfree(imc->scname); 171 kfree(imc->spiname); 172 kfree(imc->uartname); 173 kfree(imc->vco2name); 174 kfree(imc->vco1name); 175 kfree(imc->pclkname); 176 } 177 EXPORT_SYMBOL_GPL(integrator_impd1_clk_exit); 178