| 1 | /* |
| 2 | * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | */ |
| 10 | |
| 11 | #include <linux/clk-provider.h> |
| 12 | #include <linux/clkdev.h> |
| 13 | #include <linux/clk/at91_pmc.h> |
| 14 | #include <linux/of.h> |
| 15 | #include <linux/mfd/syscon.h> |
| 16 | #include <linux/regmap.h> |
| 17 | |
| 18 | #include "pmc.h" |
| 19 | |
| 20 | #define USB_SOURCE_MAX 2 |
| 21 | |
| 22 | #define SAM9X5_USB_DIV_SHIFT 8 |
| 23 | #define SAM9X5_USB_MAX_DIV 0xf |
| 24 | |
| 25 | #define RM9200_USB_DIV_SHIFT 28 |
| 26 | #define RM9200_USB_DIV_TAB_SIZE 4 |
| 27 | |
| 28 | struct at91sam9x5_clk_usb { |
| 29 | struct clk_hw hw; |
| 30 | struct regmap *regmap; |
| 31 | }; |
| 32 | |
| 33 | #define to_at91sam9x5_clk_usb(hw) \ |
| 34 | container_of(hw, struct at91sam9x5_clk_usb, hw) |
| 35 | |
| 36 | struct at91rm9200_clk_usb { |
| 37 | struct clk_hw hw; |
| 38 | struct regmap *regmap; |
| 39 | u32 divisors[4]; |
| 40 | }; |
| 41 | |
| 42 | #define to_at91rm9200_clk_usb(hw) \ |
| 43 | container_of(hw, struct at91rm9200_clk_usb, hw) |
| 44 | |
| 45 | static unsigned long at91sam9x5_clk_usb_recalc_rate(struct clk_hw *hw, |
| 46 | unsigned long parent_rate) |
| 47 | { |
| 48 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); |
| 49 | unsigned int usbr; |
| 50 | u8 usbdiv; |
| 51 | |
| 52 | regmap_read(usb->regmap, AT91_PMC_USB, &usbr); |
| 53 | usbdiv = (usbr & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT; |
| 54 | |
| 55 | return DIV_ROUND_CLOSEST(parent_rate, (usbdiv + 1)); |
| 56 | } |
| 57 | |
| 58 | static int at91sam9x5_clk_usb_determine_rate(struct clk_hw *hw, |
| 59 | struct clk_rate_request *req) |
| 60 | { |
| 61 | struct clk_hw *parent; |
| 62 | long best_rate = -EINVAL; |
| 63 | unsigned long tmp_rate; |
| 64 | int best_diff = -1; |
| 65 | int tmp_diff; |
| 66 | int i; |
| 67 | |
| 68 | for (i = 0; i < clk_hw_get_num_parents(hw); i++) { |
| 69 | int div; |
| 70 | |
| 71 | parent = clk_hw_get_parent_by_index(hw, i); |
| 72 | if (!parent) |
| 73 | continue; |
| 74 | |
| 75 | for (div = 1; div < SAM9X5_USB_MAX_DIV + 2; div++) { |
| 76 | unsigned long tmp_parent_rate; |
| 77 | |
| 78 | tmp_parent_rate = req->rate * div; |
| 79 | tmp_parent_rate = clk_hw_round_rate(parent, |
| 80 | tmp_parent_rate); |
| 81 | tmp_rate = DIV_ROUND_CLOSEST(tmp_parent_rate, div); |
| 82 | if (tmp_rate < req->rate) |
| 83 | tmp_diff = req->rate - tmp_rate; |
| 84 | else |
| 85 | tmp_diff = tmp_rate - req->rate; |
| 86 | |
| 87 | if (best_diff < 0 || best_diff > tmp_diff) { |
| 88 | best_rate = tmp_rate; |
| 89 | best_diff = tmp_diff; |
| 90 | req->best_parent_rate = tmp_parent_rate; |
| 91 | req->best_parent_hw = parent; |
| 92 | } |
| 93 | |
| 94 | if (!best_diff || tmp_rate < req->rate) |
| 95 | break; |
| 96 | } |
| 97 | |
| 98 | if (!best_diff) |
| 99 | break; |
| 100 | } |
| 101 | |
| 102 | if (best_rate < 0) |
| 103 | return best_rate; |
| 104 | |
| 105 | req->rate = best_rate; |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index) |
| 110 | { |
| 111 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); |
| 112 | |
| 113 | if (index > 1) |
| 114 | return -EINVAL; |
| 115 | |
| 116 | regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS, |
| 117 | index ? AT91_PMC_USBS : 0); |
| 118 | |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw) |
| 123 | { |
| 124 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); |
| 125 | unsigned int usbr; |
| 126 | |
| 127 | regmap_read(usb->regmap, AT91_PMC_USB, &usbr); |
| 128 | |
| 129 | return usbr & AT91_PMC_USBS; |
| 130 | } |
| 131 | |
| 132 | static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate, |
| 133 | unsigned long parent_rate) |
| 134 | { |
| 135 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); |
| 136 | unsigned long div; |
| 137 | |
| 138 | if (!rate) |
| 139 | return -EINVAL; |
| 140 | |
| 141 | div = DIV_ROUND_CLOSEST(parent_rate, rate); |
| 142 | if (div > SAM9X5_USB_MAX_DIV + 1 || !div) |
| 143 | return -EINVAL; |
| 144 | |
| 145 | regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_OHCIUSBDIV, |
| 146 | (div - 1) << SAM9X5_USB_DIV_SHIFT); |
| 147 | |
| 148 | return 0; |
| 149 | } |
| 150 | |
| 151 | static const struct clk_ops at91sam9x5_usb_ops = { |
| 152 | .recalc_rate = at91sam9x5_clk_usb_recalc_rate, |
| 153 | .determine_rate = at91sam9x5_clk_usb_determine_rate, |
| 154 | .get_parent = at91sam9x5_clk_usb_get_parent, |
| 155 | .set_parent = at91sam9x5_clk_usb_set_parent, |
| 156 | .set_rate = at91sam9x5_clk_usb_set_rate, |
| 157 | }; |
| 158 | |
| 159 | static int at91sam9n12_clk_usb_enable(struct clk_hw *hw) |
| 160 | { |
| 161 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); |
| 162 | |
| 163 | regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS, |
| 164 | AT91_PMC_USBS); |
| 165 | |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | static void at91sam9n12_clk_usb_disable(struct clk_hw *hw) |
| 170 | { |
| 171 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); |
| 172 | |
| 173 | regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS, 0); |
| 174 | } |
| 175 | |
| 176 | static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw) |
| 177 | { |
| 178 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); |
| 179 | unsigned int usbr; |
| 180 | |
| 181 | regmap_read(usb->regmap, AT91_PMC_USB, &usbr); |
| 182 | |
| 183 | return usbr & AT91_PMC_USBS; |
| 184 | } |
| 185 | |
| 186 | static const struct clk_ops at91sam9n12_usb_ops = { |
| 187 | .enable = at91sam9n12_clk_usb_enable, |
| 188 | .disable = at91sam9n12_clk_usb_disable, |
| 189 | .is_enabled = at91sam9n12_clk_usb_is_enabled, |
| 190 | .recalc_rate = at91sam9x5_clk_usb_recalc_rate, |
| 191 | .determine_rate = at91sam9x5_clk_usb_determine_rate, |
| 192 | .set_rate = at91sam9x5_clk_usb_set_rate, |
| 193 | }; |
| 194 | |
| 195 | static struct clk * __init |
| 196 | at91sam9x5_clk_register_usb(struct regmap *regmap, const char *name, |
| 197 | const char **parent_names, u8 num_parents) |
| 198 | { |
| 199 | struct at91sam9x5_clk_usb *usb; |
| 200 | struct clk *clk = NULL; |
| 201 | struct clk_init_data init; |
| 202 | |
| 203 | usb = kzalloc(sizeof(*usb), GFP_KERNEL); |
| 204 | if (!usb) |
| 205 | return ERR_PTR(-ENOMEM); |
| 206 | |
| 207 | init.name = name; |
| 208 | init.ops = &at91sam9x5_usb_ops; |
| 209 | init.parent_names = parent_names; |
| 210 | init.num_parents = num_parents; |
| 211 | init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE | |
| 212 | CLK_SET_RATE_PARENT; |
| 213 | |
| 214 | usb->hw.init = &init; |
| 215 | usb->regmap = regmap; |
| 216 | |
| 217 | clk = clk_register(NULL, &usb->hw); |
| 218 | if (IS_ERR(clk)) |
| 219 | kfree(usb); |
| 220 | |
| 221 | return clk; |
| 222 | } |
| 223 | |
| 224 | static struct clk * __init |
| 225 | at91sam9n12_clk_register_usb(struct regmap *regmap, const char *name, |
| 226 | const char *parent_name) |
| 227 | { |
| 228 | struct at91sam9x5_clk_usb *usb; |
| 229 | struct clk *clk = NULL; |
| 230 | struct clk_init_data init; |
| 231 | |
| 232 | usb = kzalloc(sizeof(*usb), GFP_KERNEL); |
| 233 | if (!usb) |
| 234 | return ERR_PTR(-ENOMEM); |
| 235 | |
| 236 | init.name = name; |
| 237 | init.ops = &at91sam9n12_usb_ops; |
| 238 | init.parent_names = &parent_name; |
| 239 | init.num_parents = 1; |
| 240 | init.flags = CLK_SET_RATE_GATE | CLK_SET_RATE_PARENT; |
| 241 | |
| 242 | usb->hw.init = &init; |
| 243 | usb->regmap = regmap; |
| 244 | |
| 245 | clk = clk_register(NULL, &usb->hw); |
| 246 | if (IS_ERR(clk)) |
| 247 | kfree(usb); |
| 248 | |
| 249 | return clk; |
| 250 | } |
| 251 | |
| 252 | static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw, |
| 253 | unsigned long parent_rate) |
| 254 | { |
| 255 | struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw); |
| 256 | unsigned int pllbr; |
| 257 | u8 usbdiv; |
| 258 | |
| 259 | regmap_read(usb->regmap, AT91_CKGR_PLLBR, &pllbr); |
| 260 | |
| 261 | usbdiv = (pllbr & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT; |
| 262 | if (usb->divisors[usbdiv]) |
| 263 | return parent_rate / usb->divisors[usbdiv]; |
| 264 | |
| 265 | return 0; |
| 266 | } |
| 267 | |
| 268 | static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate, |
| 269 | unsigned long *parent_rate) |
| 270 | { |
| 271 | struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw); |
| 272 | struct clk_hw *parent = clk_hw_get_parent(hw); |
| 273 | unsigned long bestrate = 0; |
| 274 | int bestdiff = -1; |
| 275 | unsigned long tmprate; |
| 276 | int tmpdiff; |
| 277 | int i = 0; |
| 278 | |
| 279 | for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) { |
| 280 | unsigned long tmp_parent_rate; |
| 281 | |
| 282 | if (!usb->divisors[i]) |
| 283 | continue; |
| 284 | |
| 285 | tmp_parent_rate = rate * usb->divisors[i]; |
| 286 | tmp_parent_rate = clk_hw_round_rate(parent, tmp_parent_rate); |
| 287 | tmprate = DIV_ROUND_CLOSEST(tmp_parent_rate, usb->divisors[i]); |
| 288 | if (tmprate < rate) |
| 289 | tmpdiff = rate - tmprate; |
| 290 | else |
| 291 | tmpdiff = tmprate - rate; |
| 292 | |
| 293 | if (bestdiff < 0 || bestdiff > tmpdiff) { |
| 294 | bestrate = tmprate; |
| 295 | bestdiff = tmpdiff; |
| 296 | *parent_rate = tmp_parent_rate; |
| 297 | } |
| 298 | |
| 299 | if (!bestdiff) |
| 300 | break; |
| 301 | } |
| 302 | |
| 303 | return bestrate; |
| 304 | } |
| 305 | |
| 306 | static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate, |
| 307 | unsigned long parent_rate) |
| 308 | { |
| 309 | int i; |
| 310 | struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw); |
| 311 | unsigned long div; |
| 312 | |
| 313 | if (!rate) |
| 314 | return -EINVAL; |
| 315 | |
| 316 | div = DIV_ROUND_CLOSEST(parent_rate, rate); |
| 317 | |
| 318 | for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) { |
| 319 | if (usb->divisors[i] == div) { |
| 320 | regmap_update_bits(usb->regmap, AT91_CKGR_PLLBR, |
| 321 | AT91_PMC_USBDIV, |
| 322 | i << RM9200_USB_DIV_SHIFT); |
| 323 | |
| 324 | return 0; |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | return -EINVAL; |
| 329 | } |
| 330 | |
| 331 | static const struct clk_ops at91rm9200_usb_ops = { |
| 332 | .recalc_rate = at91rm9200_clk_usb_recalc_rate, |
| 333 | .round_rate = at91rm9200_clk_usb_round_rate, |
| 334 | .set_rate = at91rm9200_clk_usb_set_rate, |
| 335 | }; |
| 336 | |
| 337 | static struct clk * __init |
| 338 | at91rm9200_clk_register_usb(struct regmap *regmap, const char *name, |
| 339 | const char *parent_name, const u32 *divisors) |
| 340 | { |
| 341 | struct at91rm9200_clk_usb *usb; |
| 342 | struct clk *clk = NULL; |
| 343 | struct clk_init_data init; |
| 344 | |
| 345 | usb = kzalloc(sizeof(*usb), GFP_KERNEL); |
| 346 | if (!usb) |
| 347 | return ERR_PTR(-ENOMEM); |
| 348 | |
| 349 | init.name = name; |
| 350 | init.ops = &at91rm9200_usb_ops; |
| 351 | init.parent_names = &parent_name; |
| 352 | init.num_parents = 1; |
| 353 | init.flags = CLK_SET_RATE_PARENT; |
| 354 | |
| 355 | usb->hw.init = &init; |
| 356 | usb->regmap = regmap; |
| 357 | memcpy(usb->divisors, divisors, sizeof(usb->divisors)); |
| 358 | |
| 359 | clk = clk_register(NULL, &usb->hw); |
| 360 | if (IS_ERR(clk)) |
| 361 | kfree(usb); |
| 362 | |
| 363 | return clk; |
| 364 | } |
| 365 | |
| 366 | static void __init of_at91sam9x5_clk_usb_setup(struct device_node *np) |
| 367 | { |
| 368 | struct clk *clk; |
| 369 | unsigned int num_parents; |
| 370 | const char *parent_names[USB_SOURCE_MAX]; |
| 371 | const char *name = np->name; |
| 372 | struct regmap *regmap; |
| 373 | |
| 374 | num_parents = of_clk_get_parent_count(np); |
| 375 | if (num_parents == 0 || num_parents > USB_SOURCE_MAX) |
| 376 | return; |
| 377 | |
| 378 | of_clk_parent_fill(np, parent_names, num_parents); |
| 379 | |
| 380 | of_property_read_string(np, "clock-output-names", &name); |
| 381 | |
| 382 | regmap = syscon_node_to_regmap(of_get_parent(np)); |
| 383 | if (IS_ERR(regmap)) |
| 384 | return; |
| 385 | |
| 386 | clk = at91sam9x5_clk_register_usb(regmap, name, parent_names, |
| 387 | num_parents); |
| 388 | if (IS_ERR(clk)) |
| 389 | return; |
| 390 | |
| 391 | of_clk_add_provider(np, of_clk_src_simple_get, clk); |
| 392 | } |
| 393 | CLK_OF_DECLARE(at91sam9x5_clk_usb, "atmel,at91sam9x5-clk-usb", |
| 394 | of_at91sam9x5_clk_usb_setup); |
| 395 | |
| 396 | static void __init of_at91sam9n12_clk_usb_setup(struct device_node *np) |
| 397 | { |
| 398 | struct clk *clk; |
| 399 | const char *parent_name; |
| 400 | const char *name = np->name; |
| 401 | struct regmap *regmap; |
| 402 | |
| 403 | parent_name = of_clk_get_parent_name(np, 0); |
| 404 | if (!parent_name) |
| 405 | return; |
| 406 | |
| 407 | of_property_read_string(np, "clock-output-names", &name); |
| 408 | |
| 409 | regmap = syscon_node_to_regmap(of_get_parent(np)); |
| 410 | if (IS_ERR(regmap)) |
| 411 | return; |
| 412 | |
| 413 | clk = at91sam9n12_clk_register_usb(regmap, name, parent_name); |
| 414 | if (IS_ERR(clk)) |
| 415 | return; |
| 416 | |
| 417 | of_clk_add_provider(np, of_clk_src_simple_get, clk); |
| 418 | } |
| 419 | CLK_OF_DECLARE(at91sam9n12_clk_usb, "atmel,at91sam9n12-clk-usb", |
| 420 | of_at91sam9n12_clk_usb_setup); |
| 421 | |
| 422 | static void __init of_at91rm9200_clk_usb_setup(struct device_node *np) |
| 423 | { |
| 424 | struct clk *clk; |
| 425 | const char *parent_name; |
| 426 | const char *name = np->name; |
| 427 | u32 divisors[4] = {0, 0, 0, 0}; |
| 428 | struct regmap *regmap; |
| 429 | |
| 430 | parent_name = of_clk_get_parent_name(np, 0); |
| 431 | if (!parent_name) |
| 432 | return; |
| 433 | |
| 434 | of_property_read_u32_array(np, "atmel,clk-divisors", divisors, 4); |
| 435 | if (!divisors[0]) |
| 436 | return; |
| 437 | |
| 438 | of_property_read_string(np, "clock-output-names", &name); |
| 439 | |
| 440 | regmap = syscon_node_to_regmap(of_get_parent(np)); |
| 441 | if (IS_ERR(regmap)) |
| 442 | return; |
| 443 | |
| 444 | clk = at91rm9200_clk_register_usb(regmap, name, parent_name, divisors); |
| 445 | if (IS_ERR(clk)) |
| 446 | return; |
| 447 | |
| 448 | of_clk_add_provider(np, of_clk_src_simple_get, clk); |
| 449 | } |
| 450 | CLK_OF_DECLARE(at91rm9200_clk_usb, "atmel,at91rm9200-clk-usb", |
| 451 | of_at91rm9200_clk_usb_setup); |