1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Marvell Kirkwood SoC clocks 4 * 5 * Copyright (C) 2012 Marvell 6 * 7 * Gregory CLEMENT <gregory.clement@free-electrons.com> 8 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> 9 * Andrew Lunn <andrew@lunn.ch> 10 * 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/clk-provider.h> 16 #include <linux/io.h> 17 #include <linux/of.h> 18 #include <linux/of_address.h> 19 #include "common.h" 20 21 /* 22 * Core Clocks 23 * 24 * Kirkwood PLL sample-at-reset configuration 25 * (6180 has different SAR layout than other Kirkwood SoCs) 26 * 27 * SAR0[4:3,22,1] : CPU frequency (6281,6292,6282) 28 * 4 = 600 MHz 29 * 6 = 800 MHz 30 * 7 = 1000 MHz 31 * 9 = 1200 MHz 32 * 12 = 1500 MHz 33 * 13 = 1600 MHz 34 * 14 = 1800 MHz 35 * 15 = 2000 MHz 36 * others reserved. 37 * 38 * SAR0[19,10:9] : CPU to L2 Clock divider ratio (6281,6292,6282) 39 * 1 = (1/2) * CPU 40 * 3 = (1/3) * CPU 41 * 5 = (1/4) * CPU 42 * others reserved. 43 * 44 * SAR0[8:5] : CPU to DDR DRAM Clock divider ratio (6281,6292,6282) 45 * 2 = (1/2) * CPU 46 * 4 = (1/3) * CPU 47 * 6 = (1/4) * CPU 48 * 7 = (2/9) * CPU 49 * 8 = (1/5) * CPU 50 * 9 = (1/6) * CPU 51 * others reserved. 52 * 53 * SAR0[4:2] : Kirkwood 6180 cpu/l2/ddr clock configuration (6180 only) 54 * 5 = [CPU = 600 MHz, L2 = (1/2) * CPU, DDR = 200 MHz = (1/3) * CPU] 55 * 6 = [CPU = 800 MHz, L2 = (1/2) * CPU, DDR = 200 MHz = (1/4) * CPU] 56 * 7 = [CPU = 1000 MHz, L2 = (1/2) * CPU, DDR = 200 MHz = (1/5) * CPU] 57 * others reserved. 58 * 59 * SAR0[21] : TCLK frequency 60 * 0 = 200 MHz 61 * 1 = 166 MHz 62 * others reserved. 63 */ 64 65 #define SAR_KIRKWOOD_CPU_FREQ(x) \ 66 (((x & (1 << 1)) >> 1) | \ 67 ((x & (1 << 22)) >> 21) | \ 68 ((x & (3 << 3)) >> 1)) 69 #define SAR_KIRKWOOD_L2_RATIO(x) \ 70 (((x & (3 << 9)) >> 9) | \ 71 (((x & (1 << 19)) >> 17))) 72 #define SAR_KIRKWOOD_DDR_RATIO 5 73 #define SAR_KIRKWOOD_DDR_RATIO_MASK 0xf 74 #define SAR_MV88F6180_CLK 2 75 #define SAR_MV88F6180_CLK_MASK 0x7 76 #define SAR_KIRKWOOD_TCLK_FREQ 21 77 #define SAR_KIRKWOOD_TCLK_FREQ_MASK 0x1 78 79 enum { KIRKWOOD_CPU_TO_L2, KIRKWOOD_CPU_TO_DDR }; 80 81 static const struct coreclk_ratio kirkwood_coreclk_ratios[] __initconst = { 82 { .id = KIRKWOOD_CPU_TO_L2, .name = "l2clk", }, 83 { .id = KIRKWOOD_CPU_TO_DDR, .name = "ddrclk", } 84 }; 85 86 static u32 __init kirkwood_get_tclk_freq(void __iomem *sar) 87 { 88 u32 opt = (readl(sar) >> SAR_KIRKWOOD_TCLK_FREQ) & 89 SAR_KIRKWOOD_TCLK_FREQ_MASK; 90 return (opt) ? 166666667 : 200000000; 91 } 92 93 static const u32 kirkwood_cpu_freqs[] __initconst = { 94 0, 0, 0, 0, 95 600000000, 96 0, 97 800000000, 98 1000000000, 99 0, 100 1200000000, 101 0, 0, 102 1500000000, 103 1600000000, 104 1800000000, 105 2000000000 106 }; 107 108 static u32 __init kirkwood_get_cpu_freq(void __iomem *sar) 109 { 110 u32 opt = SAR_KIRKWOOD_CPU_FREQ(readl(sar)); 111 return kirkwood_cpu_freqs[opt]; 112 } 113 114 static const int kirkwood_cpu_l2_ratios[8][2] __initconst = { 115 { 0, 1 }, { 1, 2 }, { 0, 1 }, { 1, 3 }, 116 { 0, 1 }, { 1, 4 }, { 0, 1 }, { 0, 1 } 117 }; 118 119 static const int kirkwood_cpu_ddr_ratios[16][2] __initconst = { 120 { 0, 1 }, { 0, 1 }, { 1, 2 }, { 0, 1 }, 121 { 1, 3 }, { 0, 1 }, { 1, 4 }, { 2, 9 }, 122 { 1, 5 }, { 1, 6 }, { 0, 1 }, { 0, 1 }, 123 { 0, 1 }, { 0, 1 }, { 0, 1 }, { 0, 1 } 124 }; 125 126 static void __init kirkwood_get_clk_ratio( 127 void __iomem *sar, int id, int *mult, int *div) 128 { 129 switch (id) { 130 case KIRKWOOD_CPU_TO_L2: 131 { 132 u32 opt = SAR_KIRKWOOD_L2_RATIO(readl(sar)); 133 *mult = kirkwood_cpu_l2_ratios[opt][0]; 134 *div = kirkwood_cpu_l2_ratios[opt][1]; 135 break; 136 } 137 case KIRKWOOD_CPU_TO_DDR: 138 { 139 u32 opt = (readl(sar) >> SAR_KIRKWOOD_DDR_RATIO) & 140 SAR_KIRKWOOD_DDR_RATIO_MASK; 141 *mult = kirkwood_cpu_ddr_ratios[opt][0]; 142 *div = kirkwood_cpu_ddr_ratios[opt][1]; 143 break; 144 } 145 } 146 } 147 148 static const u32 mv88f6180_cpu_freqs[] __initconst = { 149 0, 0, 0, 0, 0, 150 600000000, 151 800000000, 152 1000000000 153 }; 154 155 static u32 __init mv88f6180_get_cpu_freq(void __iomem *sar) 156 { 157 u32 opt = (readl(sar) >> SAR_MV88F6180_CLK) & SAR_MV88F6180_CLK_MASK; 158 return mv88f6180_cpu_freqs[opt]; 159 } 160 161 static const int mv88f6180_cpu_ddr_ratios[8][2] __initconst = { 162 { 0, 1 }, { 0, 1 }, { 0, 1 }, { 0, 1 }, 163 { 0, 1 }, { 1, 3 }, { 1, 4 }, { 1, 5 } 164 }; 165 166 static void __init mv88f6180_get_clk_ratio( 167 void __iomem *sar, int id, int *mult, int *div) 168 { 169 switch (id) { 170 case KIRKWOOD_CPU_TO_L2: 171 { 172 /* mv88f6180 has a fixed 1:2 CPU-to-L2 ratio */ 173 *mult = 1; 174 *div = 2; 175 break; 176 } 177 case KIRKWOOD_CPU_TO_DDR: 178 { 179 u32 opt = (readl(sar) >> SAR_MV88F6180_CLK) & 180 SAR_MV88F6180_CLK_MASK; 181 *mult = mv88f6180_cpu_ddr_ratios[opt][0]; 182 *div = mv88f6180_cpu_ddr_ratios[opt][1]; 183 break; 184 } 185 } 186 } 187 188 static const struct coreclk_soc_desc kirkwood_coreclks = { 189 .get_tclk_freq = kirkwood_get_tclk_freq, 190 .get_cpu_freq = kirkwood_get_cpu_freq, 191 .get_clk_ratio = kirkwood_get_clk_ratio, 192 .ratios = kirkwood_coreclk_ratios, 193 .num_ratios = ARRAY_SIZE(kirkwood_coreclk_ratios), 194 }; 195 196 static const struct coreclk_soc_desc mv88f6180_coreclks = { 197 .get_tclk_freq = kirkwood_get_tclk_freq, 198 .get_cpu_freq = mv88f6180_get_cpu_freq, 199 .get_clk_ratio = mv88f6180_get_clk_ratio, 200 .ratios = kirkwood_coreclk_ratios, 201 .num_ratios = ARRAY_SIZE(kirkwood_coreclk_ratios), 202 }; 203 204 /* 205 * Clock Gating Control 206 */ 207 208 static const struct clk_gating_soc_desc kirkwood_gating_desc[] __initconst = { 209 { "ge0", NULL, 0, 0 }, 210 { "pex0", NULL, 2, 0 }, 211 { "usb0", NULL, 3, 0 }, 212 { "sdio", NULL, 4, 0 }, 213 { "tsu", NULL, 5, 0 }, 214 { "runit", NULL, 7, 0 }, 215 { "xor0", NULL, 8, 0 }, 216 { "audio", NULL, 9, 0 }, 217 { "sata0", NULL, 14, 0 }, 218 { "sata1", NULL, 15, 0 }, 219 { "xor1", NULL, 16, 0 }, 220 { "crypto", NULL, 17, 0 }, 221 { "pex1", NULL, 18, 0 }, 222 { "ge1", NULL, 19, 0 }, 223 { "tdm", NULL, 20, 0 }, 224 { } 225 }; 226 227 228 /* 229 * Clock Muxing Control 230 */ 231 232 struct clk_muxing_soc_desc { 233 const char *name; 234 const char **parents; 235 int num_parents; 236 int shift; 237 int width; 238 unsigned long flags; 239 }; 240 241 struct clk_muxing_ctrl { 242 spinlock_t *lock; 243 struct clk **muxes; 244 int num_muxes; 245 }; 246 247 static const char *powersave_parents[] = { 248 "cpuclk", 249 "ddrclk", 250 }; 251 252 static const struct clk_muxing_soc_desc kirkwood_mux_desc[] __initconst = { 253 { "powersave", powersave_parents, ARRAY_SIZE(powersave_parents), 254 11, 1, 0 }, 255 }; 256 257 static struct clk *clk_muxing_get_src( 258 struct of_phandle_args *clkspec, void *data) 259 { 260 struct clk_muxing_ctrl *ctrl = (struct clk_muxing_ctrl *)data; 261 int n; 262 263 if (clkspec->args_count < 1) 264 return ERR_PTR(-EINVAL); 265 266 for (n = 0; n < ctrl->num_muxes; n++) { 267 struct clk_mux *mux = 268 to_clk_mux(__clk_get_hw(ctrl->muxes[n])); 269 if (clkspec->args[0] == mux->shift) 270 return ctrl->muxes[n]; 271 } 272 return ERR_PTR(-ENODEV); 273 } 274 275 static void __init kirkwood_clk_muxing_setup(struct device_node *np, 276 const struct clk_muxing_soc_desc *desc) 277 { 278 struct clk_muxing_ctrl *ctrl; 279 void __iomem *base; 280 int n; 281 282 base = of_iomap(np, 0); 283 if (WARN_ON(!base)) 284 return; 285 286 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 287 if (WARN_ON(!ctrl)) 288 goto ctrl_out; 289 290 /* lock must already be initialized */ 291 ctrl->lock = &ctrl_gating_lock; 292 293 /* Count, allocate, and register clock muxes */ 294 for (n = 0; desc[n].name;) 295 n++; 296 297 ctrl->num_muxes = n; 298 ctrl->muxes = kcalloc(ctrl->num_muxes, sizeof(struct clk *), 299 GFP_KERNEL); 300 if (WARN_ON(!ctrl->muxes)) 301 goto muxes_out; 302 303 for (n = 0; n < ctrl->num_muxes; n++) { 304 ctrl->muxes[n] = clk_register_mux(NULL, desc[n].name, 305 desc[n].parents, desc[n].num_parents, 306 desc[n].flags, base, desc[n].shift, 307 desc[n].width, desc[n].flags, ctrl->lock); 308 WARN_ON(IS_ERR(ctrl->muxes[n])); 309 } 310 311 of_clk_add_provider(np, clk_muxing_get_src, ctrl); 312 313 return; 314 muxes_out: 315 kfree(ctrl); 316 ctrl_out: 317 iounmap(base); 318 } 319 320 static void __init kirkwood_clk_init(struct device_node *np) 321 { 322 struct device_node *cgnp = 323 of_find_compatible_node(NULL, NULL, "marvell,kirkwood-gating-clock"); 324 325 326 if (of_device_is_compatible(np, "marvell,mv88f6180-core-clock")) 327 mvebu_coreclk_setup(np, &mv88f6180_coreclks); 328 else 329 mvebu_coreclk_setup(np, &kirkwood_coreclks); 330 331 if (cgnp) { 332 mvebu_clk_gating_setup(cgnp, kirkwood_gating_desc); 333 kirkwood_clk_muxing_setup(cgnp, kirkwood_mux_desc); 334 335 of_node_put(cgnp); 336 } 337 } 338 CLK_OF_DECLARE(kirkwood_clk, "marvell,kirkwood-core-clock", 339 kirkwood_clk_init); 340 CLK_OF_DECLARE(mv88f6180_clk, "marvell,mv88f6180-core-clock", 341 kirkwood_clk_init); 342