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_device.h> 11 #include <linux/platform_data/clk-integrator.h> 12 #include <linux/module.h> 13 #include <linux/mfd/syscon.h> 14 #include <linux/regmap.h> 15 16 #include "icst.h" 17 #include "clk-icst.h" 18 19 #define IMPD1_OSC1 0x00 20 #define IMPD1_OSC2 0x04 21 #define IMPD1_LOCK 0x08 22 23 struct impd1_clk { 24 char *pclkname; 25 struct clk *pclk; 26 char *vco1name; 27 struct clk *vco1clk; 28 char *vco2name; 29 struct clk *vco2clk; 30 struct clk *mmciclk; 31 char *uartname; 32 struct clk *uartclk; 33 char *spiname; 34 struct clk *spiclk; 35 char *scname; 36 struct clk *scclk; 37 struct clk_lookup *clks[15]; 38 }; 39 40 /* One entry for each connected IM-PD1 LM */ 41 static struct impd1_clk impd1_clks[4]; 42 43 /* 44 * There are two VCO's on the IM-PD1 45 */ 46 47 static const struct icst_params impd1_vco1_params = { 48 .ref = 24000000, /* 24 MHz */ 49 .vco_max = ICST525_VCO_MAX_3V, 50 .vco_min = ICST525_VCO_MIN, 51 .vd_min = 12, 52 .vd_max = 519, 53 .rd_min = 3, 54 .rd_max = 120, 55 .s2div = icst525_s2div, 56 .idx2s = icst525_idx2s, 57 }; 58 59 static const struct clk_icst_desc impd1_icst1_desc = { 60 .params = &impd1_vco1_params, 61 .vco_offset = IMPD1_OSC1, 62 .lock_offset = IMPD1_LOCK, 63 }; 64 65 static const struct icst_params impd1_vco2_params = { 66 .ref = 24000000, /* 24 MHz */ 67 .vco_max = ICST525_VCO_MAX_3V, 68 .vco_min = ICST525_VCO_MIN, 69 .vd_min = 12, 70 .vd_max = 519, 71 .rd_min = 3, 72 .rd_max = 120, 73 .s2div = icst525_s2div, 74 .idx2s = icst525_idx2s, 75 }; 76 77 static const struct clk_icst_desc impd1_icst2_desc = { 78 .params = &impd1_vco2_params, 79 .vco_offset = IMPD1_OSC2, 80 .lock_offset = IMPD1_LOCK, 81 }; 82 83 /** 84 * integrator_impd1_clk_init() - set up the integrator clock tree 85 * @base: base address of the logic module (LM) 86 * @id: the ID of this LM 87 */ 88 void integrator_impd1_clk_init(void __iomem *base, unsigned int id) 89 { 90 struct impd1_clk *imc; 91 struct clk *clk; 92 struct clk *pclk; 93 int i; 94 95 if (id > 3) { 96 pr_crit("no more than 4 LMs can be attached\n"); 97 return; 98 } 99 imc = &impd1_clks[id]; 100 101 /* Register the fixed rate PCLK */ 102 imc->pclkname = kasprintf(GFP_KERNEL, "lm%x-pclk", id); 103 pclk = clk_register_fixed_rate(NULL, imc->pclkname, NULL, 0, 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); 182 183 static int integrator_impd1_clk_spawn(struct device *dev, 184 struct device_node *parent, 185 struct device_node *np) 186 { 187 struct regmap *map; 188 struct clk *clk = ERR_PTR(-EINVAL); 189 const char *name = np->name; 190 const char *parent_name; 191 const struct clk_icst_desc *desc; 192 int ret; 193 194 map = syscon_node_to_regmap(parent); 195 if (IS_ERR(map)) { 196 pr_err("no regmap for syscon IM-PD1 ICST clock parent\n"); 197 return PTR_ERR(map); 198 } 199 200 if (of_device_is_compatible(np, "arm,impd1-vco1")) { 201 desc = &impd1_icst1_desc; 202 } else if (of_device_is_compatible(np, "arm,impd1-vco2")) { 203 desc = &impd1_icst2_desc; 204 } else { 205 dev_err(dev, "not a clock node %s\n", name); 206 return -ENODEV; 207 } 208 209 parent_name = of_clk_get_parent_name(np, 0); 210 clk = icst_clk_setup(NULL, desc, name, parent_name, map, 211 ICST_INTEGRATOR_IM_PD1); 212 if (!IS_ERR(clk)) { 213 of_clk_add_provider(np, of_clk_src_simple_get, clk); 214 ret = 0; 215 } else { 216 dev_err(dev, "error setting up IM-PD1 ICST clock\n"); 217 ret = PTR_ERR(clk); 218 } 219 220 return ret; 221 } 222 223 static int integrator_impd1_clk_probe(struct platform_device *pdev) 224 { 225 struct device *dev = &pdev->dev; 226 struct device_node *np = dev->of_node; 227 struct device_node *child; 228 int ret = 0; 229 230 for_each_available_child_of_node(np, child) { 231 ret = integrator_impd1_clk_spawn(dev, np, child); 232 if (ret) 233 break; 234 } 235 236 return ret; 237 } 238 239 static const struct of_device_id impd1_syscon_match[] = { 240 { .compatible = "arm,im-pd1-syscon", }, 241 {} 242 }; 243 MODULE_DEVICE_TABLE(of, impd1_syscon_match); 244 245 static struct platform_driver impd1_clk_driver = { 246 .driver = { 247 .name = "impd1-clk", 248 .of_match_table = impd1_syscon_match, 249 }, 250 .probe = integrator_impd1_clk_probe, 251 }; 252 builtin_platform_driver(impd1_clk_driver); 253 254 MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>"); 255 MODULE_DESCRIPTION("Arm IM-PD1 module clock driver"); 256 MODULE_LICENSE("GPL v2"); 257