Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 1 | /* |
| 2 | * SCI Clock driver for keystone based devices |
| 3 | * |
| 4 | * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/ |
| 5 | * Tero Kristo <t-kristo@ti.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any |
| 12 | * kind, whether express or implied; without even the implied warranty |
| 13 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | */ |
| 16 | #include <linux/clk-provider.h> |
| 17 | #include <linux/err.h> |
| 18 | #include <linux/io.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/of_address.h> |
| 21 | #include <linux/of_device.h> |
| 22 | #include <linux/platform_device.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/soc/ti/ti_sci_protocol.h> |
Tero Kristo | f54d2cd | 2017-08-02 21:32:13 +0300 | [diff] [blame] | 25 | #include <linux/bsearch.h> |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 26 | |
| 27 | #define SCI_CLK_SSC_ENABLE BIT(0) |
| 28 | #define SCI_CLK_ALLOW_FREQ_CHANGE BIT(1) |
| 29 | #define SCI_CLK_INPUT_TERMINATION BIT(2) |
| 30 | |
| 31 | /** |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 32 | * struct sci_clk_provider - TI SCI clock provider representation |
| 33 | * @sci: Handle to the System Control Interface protocol handler |
| 34 | * @ops: Pointer to the SCI ops to be used by the clocks |
| 35 | * @dev: Device pointer for the clock provider |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 36 | * @clocks: Clocks array for this device |
Tero Kristo | f54d2cd | 2017-08-02 21:32:13 +0300 | [diff] [blame] | 37 | * @num_clocks: Total number of clocks for this provider |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 38 | */ |
| 39 | struct sci_clk_provider { |
| 40 | const struct ti_sci_handle *sci; |
| 41 | const struct ti_sci_clk_ops *ops; |
| 42 | struct device *dev; |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 43 | struct sci_clk **clocks; |
Tero Kristo | f54d2cd | 2017-08-02 21:32:13 +0300 | [diff] [blame] | 44 | int num_clocks; |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 45 | }; |
| 46 | |
| 47 | /** |
| 48 | * struct sci_clk - TI SCI clock representation |
| 49 | * @hw: Hardware clock cookie for common clock framework |
| 50 | * @dev_id: Device index |
| 51 | * @clk_id: Clock index |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 52 | * @num_parents: Number of parents for this clock |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 53 | * @provider: Master clock provider |
| 54 | * @flags: Flags for the clock |
| 55 | */ |
| 56 | struct sci_clk { |
| 57 | struct clk_hw hw; |
| 58 | u16 dev_id; |
| 59 | u8 clk_id; |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 60 | u8 num_parents; |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 61 | struct sci_clk_provider *provider; |
| 62 | u8 flags; |
| 63 | }; |
| 64 | |
| 65 | #define to_sci_clk(_hw) container_of(_hw, struct sci_clk, hw) |
| 66 | |
| 67 | /** |
| 68 | * sci_clk_prepare - Prepare (enable) a TI SCI clock |
| 69 | * @hw: clock to prepare |
| 70 | * |
| 71 | * Prepares a clock to be actively used. Returns the SCI protocol status. |
| 72 | */ |
| 73 | static int sci_clk_prepare(struct clk_hw *hw) |
| 74 | { |
| 75 | struct sci_clk *clk = to_sci_clk(hw); |
| 76 | bool enable_ssc = clk->flags & SCI_CLK_SSC_ENABLE; |
| 77 | bool allow_freq_change = clk->flags & SCI_CLK_ALLOW_FREQ_CHANGE; |
| 78 | bool input_termination = clk->flags & SCI_CLK_INPUT_TERMINATION; |
| 79 | |
| 80 | return clk->provider->ops->get_clock(clk->provider->sci, clk->dev_id, |
| 81 | clk->clk_id, enable_ssc, |
| 82 | allow_freq_change, |
| 83 | input_termination); |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * sci_clk_unprepare - Un-prepares (disables) a TI SCI clock |
| 88 | * @hw: clock to unprepare |
| 89 | * |
| 90 | * Un-prepares a clock from active state. |
| 91 | */ |
| 92 | static void sci_clk_unprepare(struct clk_hw *hw) |
| 93 | { |
| 94 | struct sci_clk *clk = to_sci_clk(hw); |
| 95 | int ret; |
| 96 | |
| 97 | ret = clk->provider->ops->put_clock(clk->provider->sci, clk->dev_id, |
| 98 | clk->clk_id); |
| 99 | if (ret) |
| 100 | dev_err(clk->provider->dev, |
| 101 | "unprepare failed for dev=%d, clk=%d, ret=%d\n", |
| 102 | clk->dev_id, clk->clk_id, ret); |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * sci_clk_is_prepared - Check if a TI SCI clock is prepared or not |
| 107 | * @hw: clock to check status for |
| 108 | * |
| 109 | * Checks if a clock is prepared (enabled) in hardware. Returns non-zero |
| 110 | * value if clock is enabled, zero otherwise. |
| 111 | */ |
| 112 | static int sci_clk_is_prepared(struct clk_hw *hw) |
| 113 | { |
| 114 | struct sci_clk *clk = to_sci_clk(hw); |
| 115 | bool req_state, current_state; |
| 116 | int ret; |
| 117 | |
| 118 | ret = clk->provider->ops->is_on(clk->provider->sci, clk->dev_id, |
| 119 | clk->clk_id, &req_state, |
| 120 | ¤t_state); |
| 121 | if (ret) { |
| 122 | dev_err(clk->provider->dev, |
| 123 | "is_prepared failed for dev=%d, clk=%d, ret=%d\n", |
| 124 | clk->dev_id, clk->clk_id, ret); |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | return req_state; |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * sci_clk_recalc_rate - Get clock rate for a TI SCI clock |
| 133 | * @hw: clock to get rate for |
| 134 | * @parent_rate: parent rate provided by common clock framework, not used |
| 135 | * |
| 136 | * Gets the current clock rate of a TI SCI clock. Returns the current |
| 137 | * clock rate, or zero in failure. |
| 138 | */ |
| 139 | static unsigned long sci_clk_recalc_rate(struct clk_hw *hw, |
| 140 | unsigned long parent_rate) |
| 141 | { |
| 142 | struct sci_clk *clk = to_sci_clk(hw); |
| 143 | u64 freq; |
| 144 | int ret; |
| 145 | |
| 146 | ret = clk->provider->ops->get_freq(clk->provider->sci, clk->dev_id, |
| 147 | clk->clk_id, &freq); |
| 148 | if (ret) { |
| 149 | dev_err(clk->provider->dev, |
| 150 | "recalc-rate failed for dev=%d, clk=%d, ret=%d\n", |
| 151 | clk->dev_id, clk->clk_id, ret); |
| 152 | return 0; |
| 153 | } |
| 154 | |
| 155 | return freq; |
| 156 | } |
| 157 | |
| 158 | /** |
| 159 | * sci_clk_determine_rate - Determines a clock rate a clock can be set to |
| 160 | * @hw: clock to change rate for |
| 161 | * @req: requested rate configuration for the clock |
| 162 | * |
| 163 | * Determines a suitable clock rate and parent for a TI SCI clock. |
| 164 | * The parent handling is un-used, as generally the parent clock rates |
| 165 | * are not known by the kernel; instead these are internally handled |
| 166 | * by the firmware. Returns 0 on success, negative error value on failure. |
| 167 | */ |
| 168 | static int sci_clk_determine_rate(struct clk_hw *hw, |
| 169 | struct clk_rate_request *req) |
| 170 | { |
| 171 | struct sci_clk *clk = to_sci_clk(hw); |
| 172 | int ret; |
| 173 | u64 new_rate; |
| 174 | |
| 175 | ret = clk->provider->ops->get_best_match_freq(clk->provider->sci, |
| 176 | clk->dev_id, |
| 177 | clk->clk_id, |
| 178 | req->min_rate, |
| 179 | req->rate, |
| 180 | req->max_rate, |
| 181 | &new_rate); |
| 182 | if (ret) { |
| 183 | dev_err(clk->provider->dev, |
| 184 | "determine-rate failed for dev=%d, clk=%d, ret=%d\n", |
| 185 | clk->dev_id, clk->clk_id, ret); |
| 186 | return ret; |
| 187 | } |
| 188 | |
| 189 | req->rate = new_rate; |
| 190 | |
| 191 | return 0; |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * sci_clk_set_rate - Set rate for a TI SCI clock |
| 196 | * @hw: clock to change rate for |
| 197 | * @rate: target rate for the clock |
| 198 | * @parent_rate: rate of the clock parent, not used for TI SCI clocks |
| 199 | * |
| 200 | * Sets a clock frequency for a TI SCI clock. Returns the TI SCI |
| 201 | * protocol status. |
| 202 | */ |
| 203 | static int sci_clk_set_rate(struct clk_hw *hw, unsigned long rate, |
| 204 | unsigned long parent_rate) |
| 205 | { |
| 206 | struct sci_clk *clk = to_sci_clk(hw); |
| 207 | |
| 208 | return clk->provider->ops->set_freq(clk->provider->sci, clk->dev_id, |
| 209 | clk->clk_id, rate, rate, rate); |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * sci_clk_get_parent - Get the current parent of a TI SCI clock |
| 214 | * @hw: clock to get parent for |
| 215 | * |
| 216 | * Returns the index of the currently selected parent for a TI SCI clock. |
| 217 | */ |
| 218 | static u8 sci_clk_get_parent(struct clk_hw *hw) |
| 219 | { |
| 220 | struct sci_clk *clk = to_sci_clk(hw); |
| 221 | u8 parent_id; |
| 222 | int ret; |
| 223 | |
| 224 | ret = clk->provider->ops->get_parent(clk->provider->sci, clk->dev_id, |
| 225 | clk->clk_id, &parent_id); |
| 226 | if (ret) { |
| 227 | dev_err(clk->provider->dev, |
| 228 | "get-parent failed for dev=%d, clk=%d, ret=%d\n", |
| 229 | clk->dev_id, clk->clk_id, ret); |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | return parent_id - clk->clk_id - 1; |
| 234 | } |
| 235 | |
| 236 | /** |
| 237 | * sci_clk_set_parent - Set the parent of a TI SCI clock |
| 238 | * @hw: clock to set parent for |
| 239 | * @index: new parent index for the clock |
| 240 | * |
| 241 | * Sets the parent of a TI SCI clock. Return TI SCI protocol status. |
| 242 | */ |
| 243 | static int sci_clk_set_parent(struct clk_hw *hw, u8 index) |
| 244 | { |
| 245 | struct sci_clk *clk = to_sci_clk(hw); |
| 246 | |
| 247 | return clk->provider->ops->set_parent(clk->provider->sci, clk->dev_id, |
| 248 | clk->clk_id, |
| 249 | index + 1 + clk->clk_id); |
| 250 | } |
| 251 | |
| 252 | static const struct clk_ops sci_clk_ops = { |
| 253 | .prepare = sci_clk_prepare, |
| 254 | .unprepare = sci_clk_unprepare, |
| 255 | .is_prepared = sci_clk_is_prepared, |
| 256 | .recalc_rate = sci_clk_recalc_rate, |
| 257 | .determine_rate = sci_clk_determine_rate, |
| 258 | .set_rate = sci_clk_set_rate, |
| 259 | .get_parent = sci_clk_get_parent, |
| 260 | .set_parent = sci_clk_set_parent, |
| 261 | }; |
| 262 | |
| 263 | /** |
| 264 | * _sci_clk_get - Gets a handle for an SCI clock |
| 265 | * @provider: Handle to SCI clock provider |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 266 | * @sci_clk: Handle to the SCI clock to populate |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 267 | * |
| 268 | * Gets a handle to an existing TI SCI hw clock, or builds a new clock |
| 269 | * entry and registers it with the common clock framework. Called from |
| 270 | * the common clock framework, when a corresponding of_clk_get call is |
| 271 | * executed, or recursively from itself when parsing parent clocks. |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 272 | * Returns 0 on success, negative error code on failure. |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 273 | */ |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 274 | static int _sci_clk_build(struct sci_clk_provider *provider, |
| 275 | struct sci_clk *sci_clk) |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 276 | { |
| 277 | struct clk_init_data init = { NULL }; |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 278 | char *name = NULL; |
| 279 | char **parent_names = NULL; |
| 280 | int i; |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 281 | int ret = 0; |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 282 | |
| 283 | name = kasprintf(GFP_KERNEL, "%s:%d:%d", dev_name(provider->dev), |
| 284 | sci_clk->dev_id, sci_clk->clk_id); |
| 285 | |
| 286 | init.name = name; |
| 287 | |
| 288 | /* |
| 289 | * From kernel point of view, we only care about a clocks parents, |
| 290 | * if it has more than 1 possible parent. In this case, it is going |
| 291 | * to have mux functionality. Otherwise it is going to act as a root |
| 292 | * clock. |
| 293 | */ |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 294 | if (sci_clk->num_parents < 2) |
| 295 | sci_clk->num_parents = 0; |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 296 | |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 297 | if (sci_clk->num_parents) { |
| 298 | parent_names = kcalloc(sci_clk->num_parents, sizeof(char *), |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 299 | GFP_KERNEL); |
| 300 | |
| 301 | if (!parent_names) { |
| 302 | ret = -ENOMEM; |
| 303 | goto err; |
| 304 | } |
| 305 | |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 306 | for (i = 0; i < sci_clk->num_parents; i++) { |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 307 | char *parent_name; |
| 308 | |
| 309 | parent_name = kasprintf(GFP_KERNEL, "%s:%d:%d", |
| 310 | dev_name(provider->dev), |
| 311 | sci_clk->dev_id, |
| 312 | sci_clk->clk_id + 1 + i); |
| 313 | if (!parent_name) { |
| 314 | ret = -ENOMEM; |
| 315 | goto err; |
| 316 | } |
| 317 | parent_names[i] = parent_name; |
| 318 | } |
| 319 | init.parent_names = (void *)parent_names; |
| 320 | } |
| 321 | |
| 322 | init.ops = &sci_clk_ops; |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 323 | init.num_parents = sci_clk->num_parents; |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 324 | sci_clk->hw.init = &init; |
| 325 | |
| 326 | ret = devm_clk_hw_register(provider->dev, &sci_clk->hw); |
| 327 | if (ret) |
| 328 | dev_err(provider->dev, "failed clk register with %d\n", ret); |
| 329 | |
| 330 | err: |
| 331 | if (parent_names) { |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 332 | for (i = 0; i < sci_clk->num_parents; i++) |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 333 | kfree(parent_names[i]); |
| 334 | |
| 335 | kfree(parent_names); |
| 336 | } |
| 337 | |
| 338 | kfree(name); |
| 339 | |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 340 | return ret; |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 341 | } |
| 342 | |
Tero Kristo | f54d2cd | 2017-08-02 21:32:13 +0300 | [diff] [blame] | 343 | static int _cmp_sci_clk(const void *a, const void *b) |
| 344 | { |
| 345 | const struct sci_clk *ca = a; |
| 346 | const struct sci_clk *cb = *(struct sci_clk **)b; |
| 347 | |
| 348 | if (ca->dev_id == cb->dev_id && ca->clk_id == cb->clk_id) |
| 349 | return 0; |
| 350 | if (ca->dev_id > cb->dev_id || |
| 351 | (ca->dev_id == cb->dev_id && ca->clk_id > cb->clk_id)) |
| 352 | return 1; |
| 353 | return -1; |
| 354 | } |
| 355 | |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 356 | /** |
| 357 | * sci_clk_get - Xlate function for getting clock handles |
| 358 | * @clkspec: device tree clock specifier |
| 359 | * @data: pointer to the clock provider |
| 360 | * |
| 361 | * Xlate function for retrieving clock TI SCI hw clock handles based on |
| 362 | * device tree clock specifier. Called from the common clock framework, |
| 363 | * when a corresponding of_clk_get call is executed. Returns a pointer |
| 364 | * to the TI SCI hw clock struct, or ERR_PTR value in failure. |
| 365 | */ |
| 366 | static struct clk_hw *sci_clk_get(struct of_phandle_args *clkspec, void *data) |
| 367 | { |
| 368 | struct sci_clk_provider *provider = data; |
Tero Kristo | f54d2cd | 2017-08-02 21:32:13 +0300 | [diff] [blame] | 369 | struct sci_clk **clk; |
| 370 | struct sci_clk key; |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 371 | |
| 372 | if (clkspec->args_count != 2) |
| 373 | return ERR_PTR(-EINVAL); |
| 374 | |
Tero Kristo | f54d2cd | 2017-08-02 21:32:13 +0300 | [diff] [blame] | 375 | key.dev_id = clkspec->args[0]; |
| 376 | key.clk_id = clkspec->args[1]; |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 377 | |
Tero Kristo | f54d2cd | 2017-08-02 21:32:13 +0300 | [diff] [blame] | 378 | clk = bsearch(&key, provider->clocks, provider->num_clocks, |
| 379 | sizeof(clk), _cmp_sci_clk); |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 380 | |
Tero Kristo | f54d2cd | 2017-08-02 21:32:13 +0300 | [diff] [blame] | 381 | if (!clk) |
| 382 | return ERR_PTR(-ENODEV); |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 383 | |
Tero Kristo | f54d2cd | 2017-08-02 21:32:13 +0300 | [diff] [blame] | 384 | return &(*clk)->hw; |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | static int ti_sci_init_clocks(struct sci_clk_provider *p) |
| 388 | { |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 389 | int i; |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 390 | int ret; |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 391 | |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 392 | for (i = 0; i < p->num_clocks; i++) { |
| 393 | ret = _sci_clk_build(p, p->clocks[i]); |
| 394 | if (ret) |
| 395 | return ret; |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 396 | } |
| 397 | |
| 398 | return 0; |
| 399 | } |
| 400 | |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 401 | static const struct of_device_id ti_sci_clk_of_match[] = { |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 402 | { .compatible = "ti,k2g-sci-clk" }, |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 403 | { /* Sentinel */ }, |
| 404 | }; |
| 405 | MODULE_DEVICE_TABLE(of, ti_sci_clk_of_match); |
| 406 | |
| 407 | /** |
| 408 | * ti_sci_clk_probe - Probe function for the TI SCI clock driver |
| 409 | * @pdev: platform device pointer to be probed |
| 410 | * |
| 411 | * Probes the TI SCI clock device. Allocates a new clock provider |
| 412 | * and registers this to the common clock framework. Also applies |
| 413 | * any required flags to the identified clocks via clock lists |
| 414 | * supplied from DT. Returns 0 for success, negative error value |
| 415 | * for failure. |
| 416 | */ |
| 417 | static int ti_sci_clk_probe(struct platform_device *pdev) |
| 418 | { |
| 419 | struct device *dev = &pdev->dev; |
| 420 | struct device_node *np = dev->of_node; |
| 421 | struct sci_clk_provider *provider; |
| 422 | const struct ti_sci_handle *handle; |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 423 | int ret; |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 424 | int num_clks = 0; |
| 425 | struct sci_clk **clks = NULL; |
| 426 | struct sci_clk **tmp_clks; |
| 427 | struct sci_clk *sci_clk; |
| 428 | int max_clks = 0; |
| 429 | int clk_id = 0; |
| 430 | int dev_id = 0; |
| 431 | u8 num_parents; |
| 432 | int gap_size = 0; |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 433 | |
| 434 | handle = devm_ti_sci_get_handle(dev); |
| 435 | if (IS_ERR(handle)) |
| 436 | return PTR_ERR(handle); |
| 437 | |
| 438 | provider = devm_kzalloc(dev, sizeof(*provider), GFP_KERNEL); |
| 439 | if (!provider) |
| 440 | return -ENOMEM; |
| 441 | |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 442 | provider->sci = handle; |
| 443 | provider->ops = &handle->ops.clk_ops; |
| 444 | provider->dev = dev; |
| 445 | |
Tero Kristo | 3c13933 | 2017-12-12 10:31:15 +0200 | [diff] [blame] | 446 | while (1) { |
| 447 | ret = provider->ops->get_num_parents(provider->sci, dev_id, |
| 448 | clk_id, &num_parents); |
| 449 | if (ret) { |
| 450 | gap_size++; |
| 451 | if (!clk_id) { |
| 452 | if (gap_size >= 5) |
| 453 | break; |
| 454 | dev_id++; |
| 455 | } else { |
| 456 | if (gap_size >= 2) { |
| 457 | dev_id++; |
| 458 | clk_id = 0; |
| 459 | gap_size = 0; |
| 460 | } else { |
| 461 | clk_id++; |
| 462 | } |
| 463 | } |
| 464 | continue; |
| 465 | } |
| 466 | |
| 467 | gap_size = 0; |
| 468 | |
| 469 | if (num_clks == max_clks) { |
| 470 | tmp_clks = devm_kmalloc_array(dev, max_clks + 64, |
| 471 | sizeof(sci_clk), |
| 472 | GFP_KERNEL); |
| 473 | memcpy(tmp_clks, clks, max_clks * sizeof(sci_clk)); |
| 474 | if (max_clks) |
| 475 | devm_kfree(dev, clks); |
| 476 | max_clks += 64; |
| 477 | clks = tmp_clks; |
| 478 | } |
| 479 | |
| 480 | sci_clk = devm_kzalloc(dev, sizeof(*sci_clk), GFP_KERNEL); |
| 481 | if (!sci_clk) |
| 482 | return -ENOMEM; |
| 483 | sci_clk->dev_id = dev_id; |
| 484 | sci_clk->clk_id = clk_id; |
| 485 | sci_clk->provider = provider; |
| 486 | sci_clk->num_parents = num_parents; |
| 487 | |
| 488 | clks[num_clks] = sci_clk; |
| 489 | |
| 490 | clk_id++; |
| 491 | num_clks++; |
| 492 | } |
| 493 | |
| 494 | provider->clocks = devm_kmalloc_array(dev, num_clks, sizeof(sci_clk), |
| 495 | GFP_KERNEL); |
| 496 | if (!provider->clocks) |
| 497 | return -ENOMEM; |
| 498 | |
| 499 | memcpy(provider->clocks, clks, num_clks * sizeof(sci_clk)); |
| 500 | |
| 501 | provider->num_clocks = num_clks; |
| 502 | |
| 503 | devm_kfree(dev, clks); |
| 504 | |
Tero Kristo | b745c07 | 2017-06-13 10:09:27 +0300 | [diff] [blame] | 505 | ret = ti_sci_init_clocks(provider); |
| 506 | if (ret) { |
| 507 | pr_err("ti-sci-init-clocks failed.\n"); |
| 508 | return ret; |
| 509 | } |
| 510 | |
| 511 | return of_clk_add_hw_provider(np, sci_clk_get, provider); |
| 512 | } |
| 513 | |
| 514 | /** |
| 515 | * ti_sci_clk_remove - Remove TI SCI clock device |
| 516 | * @pdev: platform device pointer for the device to be removed |
| 517 | * |
| 518 | * Removes the TI SCI device. Unregisters the clock provider registered |
| 519 | * via common clock framework. Any memory allocated for the device will |
| 520 | * be free'd silently via the devm framework. Returns 0 always. |
| 521 | */ |
| 522 | static int ti_sci_clk_remove(struct platform_device *pdev) |
| 523 | { |
| 524 | of_clk_del_provider(pdev->dev.of_node); |
| 525 | |
| 526 | return 0; |
| 527 | } |
| 528 | |
| 529 | static struct platform_driver ti_sci_clk_driver = { |
| 530 | .probe = ti_sci_clk_probe, |
| 531 | .remove = ti_sci_clk_remove, |
| 532 | .driver = { |
| 533 | .name = "ti-sci-clk", |
| 534 | .of_match_table = of_match_ptr(ti_sci_clk_of_match), |
| 535 | }, |
| 536 | }; |
| 537 | module_platform_driver(ti_sci_clk_driver); |
| 538 | |
| 539 | MODULE_LICENSE("GPL v2"); |
| 540 | MODULE_DESCRIPTION("TI System Control Interface(SCI) Clock driver"); |
| 541 | MODULE_AUTHOR("Tero Kristo"); |
| 542 | MODULE_ALIAS("platform:ti-sci-clk"); |