1 /* 2 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 17 #include <linux/clkdev.h> 18 #include <linux/clk.h> 19 #include <linux/clk-provider.h> 20 #include <linux/delay.h> 21 #include <linux/of.h> 22 #include <linux/clk/tegra.h> 23 #include <linux/reset-controller.h> 24 25 #include <soc/tegra/fuse.h> 26 27 #include "clk.h" 28 29 #define CLK_OUT_ENB_L 0x010 30 #define CLK_OUT_ENB_H 0x014 31 #define CLK_OUT_ENB_U 0x018 32 #define CLK_OUT_ENB_V 0x360 33 #define CLK_OUT_ENB_W 0x364 34 #define CLK_OUT_ENB_X 0x280 35 #define CLK_OUT_ENB_Y 0x298 36 #define CLK_OUT_ENB_SET_L 0x320 37 #define CLK_OUT_ENB_CLR_L 0x324 38 #define CLK_OUT_ENB_SET_H 0x328 39 #define CLK_OUT_ENB_CLR_H 0x32c 40 #define CLK_OUT_ENB_SET_U 0x330 41 #define CLK_OUT_ENB_CLR_U 0x334 42 #define CLK_OUT_ENB_SET_V 0x440 43 #define CLK_OUT_ENB_CLR_V 0x444 44 #define CLK_OUT_ENB_SET_W 0x448 45 #define CLK_OUT_ENB_CLR_W 0x44c 46 #define CLK_OUT_ENB_SET_X 0x284 47 #define CLK_OUT_ENB_CLR_X 0x288 48 #define CLK_OUT_ENB_SET_Y 0x29c 49 #define CLK_OUT_ENB_CLR_Y 0x2a0 50 51 #define RST_DEVICES_L 0x004 52 #define RST_DEVICES_H 0x008 53 #define RST_DEVICES_U 0x00C 54 #define RST_DEVICES_V 0x358 55 #define RST_DEVICES_W 0x35C 56 #define RST_DEVICES_X 0x28C 57 #define RST_DEVICES_Y 0x2a4 58 #define RST_DEVICES_SET_L 0x300 59 #define RST_DEVICES_CLR_L 0x304 60 #define RST_DEVICES_SET_H 0x308 61 #define RST_DEVICES_CLR_H 0x30c 62 #define RST_DEVICES_SET_U 0x310 63 #define RST_DEVICES_CLR_U 0x314 64 #define RST_DEVICES_SET_V 0x430 65 #define RST_DEVICES_CLR_V 0x434 66 #define RST_DEVICES_SET_W 0x438 67 #define RST_DEVICES_CLR_W 0x43c 68 #define RST_DEVICES_SET_X 0x290 69 #define RST_DEVICES_CLR_X 0x294 70 #define RST_DEVICES_SET_Y 0x2a8 71 #define RST_DEVICES_CLR_Y 0x2ac 72 73 /* Global data of Tegra CPU CAR ops */ 74 static struct tegra_cpu_car_ops dummy_car_ops; 75 struct tegra_cpu_car_ops *tegra_cpu_car_ops = &dummy_car_ops; 76 77 int *periph_clk_enb_refcnt; 78 static int periph_banks; 79 static struct clk **clks; 80 static int clk_num; 81 static struct clk_onecell_data clk_data; 82 83 /* Handlers for SoC-specific reset lines */ 84 static int (*special_reset_assert)(unsigned long); 85 static int (*special_reset_deassert)(unsigned long); 86 static unsigned int num_special_reset; 87 88 static const struct tegra_clk_periph_regs periph_regs[] = { 89 [0] = { 90 .enb_reg = CLK_OUT_ENB_L, 91 .enb_set_reg = CLK_OUT_ENB_SET_L, 92 .enb_clr_reg = CLK_OUT_ENB_CLR_L, 93 .rst_reg = RST_DEVICES_L, 94 .rst_set_reg = RST_DEVICES_SET_L, 95 .rst_clr_reg = RST_DEVICES_CLR_L, 96 }, 97 [1] = { 98 .enb_reg = CLK_OUT_ENB_H, 99 .enb_set_reg = CLK_OUT_ENB_SET_H, 100 .enb_clr_reg = CLK_OUT_ENB_CLR_H, 101 .rst_reg = RST_DEVICES_H, 102 .rst_set_reg = RST_DEVICES_SET_H, 103 .rst_clr_reg = RST_DEVICES_CLR_H, 104 }, 105 [2] = { 106 .enb_reg = CLK_OUT_ENB_U, 107 .enb_set_reg = CLK_OUT_ENB_SET_U, 108 .enb_clr_reg = CLK_OUT_ENB_CLR_U, 109 .rst_reg = RST_DEVICES_U, 110 .rst_set_reg = RST_DEVICES_SET_U, 111 .rst_clr_reg = RST_DEVICES_CLR_U, 112 }, 113 [3] = { 114 .enb_reg = CLK_OUT_ENB_V, 115 .enb_set_reg = CLK_OUT_ENB_SET_V, 116 .enb_clr_reg = CLK_OUT_ENB_CLR_V, 117 .rst_reg = RST_DEVICES_V, 118 .rst_set_reg = RST_DEVICES_SET_V, 119 .rst_clr_reg = RST_DEVICES_CLR_V, 120 }, 121 [4] = { 122 .enb_reg = CLK_OUT_ENB_W, 123 .enb_set_reg = CLK_OUT_ENB_SET_W, 124 .enb_clr_reg = CLK_OUT_ENB_CLR_W, 125 .rst_reg = RST_DEVICES_W, 126 .rst_set_reg = RST_DEVICES_SET_W, 127 .rst_clr_reg = RST_DEVICES_CLR_W, 128 }, 129 [5] = { 130 .enb_reg = CLK_OUT_ENB_X, 131 .enb_set_reg = CLK_OUT_ENB_SET_X, 132 .enb_clr_reg = CLK_OUT_ENB_CLR_X, 133 .rst_reg = RST_DEVICES_X, 134 .rst_set_reg = RST_DEVICES_SET_X, 135 .rst_clr_reg = RST_DEVICES_CLR_X, 136 }, 137 [6] = { 138 .enb_reg = CLK_OUT_ENB_Y, 139 .enb_set_reg = CLK_OUT_ENB_SET_Y, 140 .enb_clr_reg = CLK_OUT_ENB_CLR_Y, 141 .rst_reg = RST_DEVICES_Y, 142 .rst_set_reg = RST_DEVICES_SET_Y, 143 .rst_clr_reg = RST_DEVICES_CLR_Y, 144 }, 145 }; 146 147 static void __iomem *clk_base; 148 149 static int tegra_clk_rst_assert(struct reset_controller_dev *rcdev, 150 unsigned long id) 151 { 152 /* 153 * If peripheral is on the APB bus then we must read the APB bus to 154 * flush the write operation in apb bus. This will avoid peripheral 155 * access after disabling clock. Since the reset driver has no 156 * knowledge of which reset IDs represent which devices, simply do 157 * this all the time. 158 */ 159 tegra_read_chipid(); 160 161 if (id < periph_banks * 32) { 162 writel_relaxed(BIT(id % 32), 163 clk_base + periph_regs[id / 32].rst_set_reg); 164 return 0; 165 } else if (id < periph_banks * 32 + num_special_reset) { 166 return special_reset_assert(id); 167 } 168 169 return -EINVAL; 170 } 171 172 static int tegra_clk_rst_deassert(struct reset_controller_dev *rcdev, 173 unsigned long id) 174 { 175 if (id < periph_banks * 32) { 176 writel_relaxed(BIT(id % 32), 177 clk_base + periph_regs[id / 32].rst_clr_reg); 178 return 0; 179 } else if (id < periph_banks * 32 + num_special_reset) { 180 return special_reset_deassert(id); 181 } 182 183 return -EINVAL; 184 } 185 186 static int tegra_clk_rst_reset(struct reset_controller_dev *rcdev, 187 unsigned long id) 188 { 189 int err; 190 191 err = tegra_clk_rst_assert(rcdev, id); 192 if (err) 193 return err; 194 195 udelay(1); 196 197 return tegra_clk_rst_deassert(rcdev, id); 198 } 199 200 const struct tegra_clk_periph_regs *get_reg_bank(int clkid) 201 { 202 int reg_bank = clkid / 32; 203 204 if (reg_bank < periph_banks) 205 return &periph_regs[reg_bank]; 206 else { 207 WARN_ON(1); 208 return NULL; 209 } 210 } 211 212 struct clk ** __init tegra_clk_init(void __iomem *regs, int num, int banks) 213 { 214 clk_base = regs; 215 216 if (WARN_ON(banks > ARRAY_SIZE(periph_regs))) 217 return NULL; 218 219 periph_clk_enb_refcnt = kzalloc(32 * banks * 220 sizeof(*periph_clk_enb_refcnt), GFP_KERNEL); 221 if (!periph_clk_enb_refcnt) 222 return NULL; 223 224 periph_banks = banks; 225 226 clks = kzalloc(num * sizeof(struct clk *), GFP_KERNEL); 227 if (!clks) 228 kfree(periph_clk_enb_refcnt); 229 230 clk_num = num; 231 232 return clks; 233 } 234 235 void __init tegra_init_dup_clks(struct tegra_clk_duplicate *dup_list, 236 struct clk *clks[], int clk_max) 237 { 238 struct clk *clk; 239 240 for (; dup_list->clk_id < clk_max; dup_list++) { 241 clk = clks[dup_list->clk_id]; 242 dup_list->lookup.clk = clk; 243 clkdev_add(&dup_list->lookup); 244 } 245 } 246 247 void __init tegra_init_from_table(struct tegra_clk_init_table *tbl, 248 struct clk *clks[], int clk_max) 249 { 250 struct clk *clk; 251 252 for (; tbl->clk_id < clk_max; tbl++) { 253 clk = clks[tbl->clk_id]; 254 if (IS_ERR_OR_NULL(clk)) { 255 pr_err("%s: invalid entry %ld in clks array for id %d\n", 256 __func__, PTR_ERR(clk), tbl->clk_id); 257 WARN_ON(1); 258 259 continue; 260 } 261 262 if (tbl->parent_id < clk_max) { 263 struct clk *parent = clks[tbl->parent_id]; 264 if (clk_set_parent(clk, parent)) { 265 pr_err("%s: Failed to set parent %s of %s\n", 266 __func__, __clk_get_name(parent), 267 __clk_get_name(clk)); 268 WARN_ON(1); 269 } 270 } 271 272 if (tbl->rate) 273 if (clk_set_rate(clk, tbl->rate)) { 274 pr_err("%s: Failed to set rate %lu of %s\n", 275 __func__, tbl->rate, 276 __clk_get_name(clk)); 277 WARN_ON(1); 278 } 279 280 if (tbl->state) 281 if (clk_prepare_enable(clk)) { 282 pr_err("%s: Failed to enable %s\n", __func__, 283 __clk_get_name(clk)); 284 WARN_ON(1); 285 } 286 } 287 } 288 289 static const struct reset_control_ops rst_ops = { 290 .assert = tegra_clk_rst_assert, 291 .deassert = tegra_clk_rst_deassert, 292 .reset = tegra_clk_rst_reset, 293 }; 294 295 static struct reset_controller_dev rst_ctlr = { 296 .ops = &rst_ops, 297 .owner = THIS_MODULE, 298 .of_reset_n_cells = 1, 299 }; 300 301 void __init tegra_add_of_provider(struct device_node *np) 302 { 303 int i; 304 305 for (i = 0; i < clk_num; i++) { 306 if (IS_ERR(clks[i])) { 307 pr_err 308 ("Tegra clk %d: register failed with %ld\n", 309 i, PTR_ERR(clks[i])); 310 } 311 if (!clks[i]) 312 clks[i] = ERR_PTR(-EINVAL); 313 } 314 315 clk_data.clks = clks; 316 clk_data.clk_num = clk_num; 317 of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data); 318 319 rst_ctlr.of_node = np; 320 rst_ctlr.nr_resets = periph_banks * 32 + num_special_reset; 321 reset_controller_register(&rst_ctlr); 322 } 323 324 void __init tegra_init_special_resets(unsigned int num, 325 int (*assert)(unsigned long), 326 int (*deassert)(unsigned long)) 327 { 328 num_special_reset = num; 329 special_reset_assert = assert; 330 special_reset_deassert = deassert; 331 } 332 333 void __init tegra_register_devclks(struct tegra_devclk *dev_clks, int num) 334 { 335 int i; 336 337 for (i = 0; i < num; i++, dev_clks++) 338 clk_register_clkdev(clks[dev_clks->dt_id], dev_clks->con_id, 339 dev_clks->dev_id); 340 341 for (i = 0; i < clk_num; i++) { 342 if (!IS_ERR_OR_NULL(clks[i])) 343 clk_register_clkdev(clks[i], __clk_get_name(clks[i]), 344 "tegra-clk-debug"); 345 } 346 } 347 348 struct clk ** __init tegra_lookup_dt_id(int clk_id, 349 struct tegra_clk *tegra_clk) 350 { 351 if (tegra_clk[clk_id].present) 352 return &clks[tegra_clk[clk_id].dt_id]; 353 else 354 return NULL; 355 } 356 357 tegra_clk_apply_init_table_func tegra_clk_apply_init_table; 358 359 static int __init tegra_clocks_apply_init_table(void) 360 { 361 if (!tegra_clk_apply_init_table) 362 return 0; 363 364 tegra_clk_apply_init_table(); 365 366 return 0; 367 } 368 arch_initcall(tegra_clocks_apply_init_table); 369