Maxime Ripard | 992a56e | 2014-07-10 23:55:18 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2013 Emilio López |
| 3 | * |
| 4 | * Emilio López <emilio@elopez.com.ar> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | */ |
| 16 | |
Stephen Boyd | 9dfefe8 | 2015-06-19 15:00:46 -0700 | [diff] [blame] | 17 | #include <linux/clk.h> |
Maxime Ripard | 992a56e | 2014-07-10 23:55:18 +0200 | [diff] [blame] | 18 | #include <linux/clk-provider.h> |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 19 | #include <linux/of_address.h> |
Hans de Goede | 6ea3953 | 2014-12-20 11:36:49 +0100 | [diff] [blame] | 20 | #include <linux/platform_device.h> |
Stephen Boyd | 9dfefe8 | 2015-06-19 15:00:46 -0700 | [diff] [blame] | 21 | #include <linux/slab.h> |
Maxime Ripard | 992a56e | 2014-07-10 23:55:18 +0200 | [diff] [blame] | 22 | |
| 23 | #include "clk-factors.h" |
| 24 | |
| 25 | /** |
| 26 | * sun4i_get_mod0_factors() - calculates m, n factors for MOD0-style clocks |
| 27 | * MOD0 rate is calculated as follows |
| 28 | * rate = (parent_rate >> p) / (m + 1); |
| 29 | */ |
| 30 | |
| 31 | static void sun4i_a10_get_mod0_factors(u32 *freq, u32 parent_rate, |
| 32 | u8 *n, u8 *k, u8 *m, u8 *p) |
| 33 | { |
| 34 | u8 div, calcm, calcp; |
| 35 | |
| 36 | /* These clocks can only divide, so we will never be able to achieve |
| 37 | * frequencies higher than the parent frequency */ |
| 38 | if (*freq > parent_rate) |
| 39 | *freq = parent_rate; |
| 40 | |
| 41 | div = DIV_ROUND_UP(parent_rate, *freq); |
| 42 | |
| 43 | if (div < 16) |
| 44 | calcp = 0; |
| 45 | else if (div / 2 < 16) |
| 46 | calcp = 1; |
| 47 | else if (div / 4 < 16) |
| 48 | calcp = 2; |
| 49 | else |
| 50 | calcp = 3; |
| 51 | |
| 52 | calcm = DIV_ROUND_UP(div, 1 << calcp); |
| 53 | |
| 54 | *freq = (parent_rate >> calcp) / calcm; |
| 55 | |
| 56 | /* we were called to round the frequency, we can now return */ |
| 57 | if (n == NULL) |
| 58 | return; |
| 59 | |
| 60 | *m = calcm - 1; |
| 61 | *p = calcp; |
| 62 | } |
| 63 | |
| 64 | /* user manual says "n" but it's really "p" */ |
| 65 | static struct clk_factors_config sun4i_a10_mod0_config = { |
| 66 | .mshift = 0, |
| 67 | .mwidth = 4, |
| 68 | .pshift = 16, |
| 69 | .pwidth = 2, |
| 70 | }; |
| 71 | |
Hans de Goede | 6ea3953 | 2014-12-20 11:36:49 +0100 | [diff] [blame] | 72 | static const struct factors_data sun4i_a10_mod0_data = { |
Maxime Ripard | 992a56e | 2014-07-10 23:55:18 +0200 | [diff] [blame] | 73 | .enable = 31, |
| 74 | .mux = 24, |
Chen-Yu Tsai | e94f8cb3 | 2014-10-20 22:10:26 +0800 | [diff] [blame] | 75 | .muxmask = BIT(1) | BIT(0), |
Maxime Ripard | 992a56e | 2014-07-10 23:55:18 +0200 | [diff] [blame] | 76 | .table = &sun4i_a10_mod0_config, |
| 77 | .getter = sun4i_a10_get_mod0_factors, |
| 78 | }; |
| 79 | |
| 80 | static DEFINE_SPINLOCK(sun4i_a10_mod0_lock); |
| 81 | |
| 82 | static void __init sun4i_a10_mod0_setup(struct device_node *node) |
| 83 | { |
Hans de Goede | 7c74c22 | 2014-11-23 14:38:07 +0100 | [diff] [blame] | 84 | void __iomem *reg; |
| 85 | |
| 86 | reg = of_iomap(node, 0); |
| 87 | if (!reg) { |
Hans de Goede | 6ea3953 | 2014-12-20 11:36:49 +0100 | [diff] [blame] | 88 | /* |
| 89 | * This happens with mod0 clk nodes instantiated through |
| 90 | * mfd, as those do not have their resources assigned at |
| 91 | * CLK_OF_DECLARE time yet, so do not print an error. |
| 92 | */ |
Hans de Goede | 7c74c22 | 2014-11-23 14:38:07 +0100 | [diff] [blame] | 93 | return; |
| 94 | } |
| 95 | |
| 96 | sunxi_factors_register(node, &sun4i_a10_mod0_data, |
| 97 | &sun4i_a10_mod0_lock, reg); |
Maxime Ripard | 992a56e | 2014-07-10 23:55:18 +0200 | [diff] [blame] | 98 | } |
| 99 | CLK_OF_DECLARE(sun4i_a10_mod0, "allwinner,sun4i-a10-mod0-clk", sun4i_a10_mod0_setup); |
Maxime Ripard | eaa18f5 | 2014-07-10 23:56:11 +0200 | [diff] [blame] | 100 | |
Hans de Goede | 6ea3953 | 2014-12-20 11:36:49 +0100 | [diff] [blame] | 101 | static int sun4i_a10_mod0_clk_probe(struct platform_device *pdev) |
| 102 | { |
| 103 | struct device_node *np = pdev->dev.of_node; |
| 104 | struct resource *r; |
| 105 | void __iomem *reg; |
| 106 | |
| 107 | if (!np) |
| 108 | return -ENODEV; |
| 109 | |
| 110 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 111 | reg = devm_ioremap_resource(&pdev->dev, r); |
| 112 | if (IS_ERR(reg)) |
| 113 | return PTR_ERR(reg); |
| 114 | |
| 115 | sunxi_factors_register(np, &sun4i_a10_mod0_data, |
| 116 | &sun4i_a10_mod0_lock, reg); |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | static const struct of_device_id sun4i_a10_mod0_clk_dt_ids[] = { |
| 121 | { .compatible = "allwinner,sun4i-a10-mod0-clk" }, |
| 122 | { /* sentinel */ } |
| 123 | }; |
| 124 | |
| 125 | static struct platform_driver sun4i_a10_mod0_clk_driver = { |
| 126 | .driver = { |
| 127 | .name = "sun4i-a10-mod0-clk", |
| 128 | .of_match_table = sun4i_a10_mod0_clk_dt_ids, |
| 129 | }, |
| 130 | .probe = sun4i_a10_mod0_clk_probe, |
| 131 | }; |
Paul Gortmaker | 77459a0 | 2015-06-03 11:20:05 -0400 | [diff] [blame] | 132 | builtin_platform_driver(sun4i_a10_mod0_clk_driver); |
Hans de Goede | 6ea3953 | 2014-12-20 11:36:49 +0100 | [diff] [blame] | 133 | |
Chen-Yu Tsai | 61af4d8 | 2015-01-17 13:19:26 +0800 | [diff] [blame] | 134 | static const struct factors_data sun9i_a80_mod0_data __initconst = { |
| 135 | .enable = 31, |
| 136 | .mux = 24, |
| 137 | .muxmask = BIT(3) | BIT(2) | BIT(1) | BIT(0), |
| 138 | .table = &sun4i_a10_mod0_config, |
| 139 | .getter = sun4i_a10_get_mod0_factors, |
| 140 | }; |
| 141 | |
| 142 | static void __init sun9i_a80_mod0_setup(struct device_node *node) |
| 143 | { |
| 144 | void __iomem *reg; |
| 145 | |
| 146 | reg = of_io_request_and_map(node, 0, of_node_full_name(node)); |
| 147 | if (IS_ERR(reg)) { |
| 148 | pr_err("Could not get registers for mod0-clk: %s\n", |
| 149 | node->name); |
| 150 | return; |
| 151 | } |
| 152 | |
| 153 | sunxi_factors_register(node, &sun9i_a80_mod0_data, |
| 154 | &sun4i_a10_mod0_lock, reg); |
| 155 | } |
| 156 | CLK_OF_DECLARE(sun9i_a80_mod0, "allwinner,sun9i-a80-mod0-clk", sun9i_a80_mod0_setup); |
| 157 | |
Maxime Ripard | eaa18f5 | 2014-07-10 23:56:11 +0200 | [diff] [blame] | 158 | static DEFINE_SPINLOCK(sun5i_a13_mbus_lock); |
| 159 | |
| 160 | static void __init sun5i_a13_mbus_setup(struct device_node *node) |
| 161 | { |
Hans de Goede | 7c74c22 | 2014-11-23 14:38:07 +0100 | [diff] [blame] | 162 | struct clk *mbus; |
| 163 | void __iomem *reg; |
| 164 | |
| 165 | reg = of_iomap(node, 0); |
| 166 | if (!reg) { |
| 167 | pr_err("Could not get registers for a13-mbus-clk\n"); |
| 168 | return; |
| 169 | } |
| 170 | |
| 171 | mbus = sunxi_factors_register(node, &sun4i_a10_mod0_data, |
| 172 | &sun5i_a13_mbus_lock, reg); |
Maxime Ripard | eaa18f5 | 2014-07-10 23:56:11 +0200 | [diff] [blame] | 173 | |
| 174 | /* The MBUS clocks needs to be always enabled */ |
| 175 | __clk_get(mbus); |
| 176 | clk_prepare_enable(mbus); |
| 177 | } |
| 178 | CLK_OF_DECLARE(sun5i_a13_mbus, "allwinner,sun5i-a13-mbus-clk", sun5i_a13_mbus_setup); |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 179 | |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 180 | struct mmc_phase { |
| 181 | struct clk_hw hw; |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 182 | u8 offset; |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 183 | void __iomem *reg; |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 184 | spinlock_t *lock; |
| 185 | }; |
| 186 | |
| 187 | #define to_mmc_phase(_hw) container_of(_hw, struct mmc_phase, hw) |
| 188 | |
| 189 | static int mmc_get_phase(struct clk_hw *hw) |
| 190 | { |
| 191 | struct clk *mmc, *mmc_parent, *clk = hw->clk; |
| 192 | struct mmc_phase *phase = to_mmc_phase(hw); |
| 193 | unsigned int mmc_rate, mmc_parent_rate; |
| 194 | u16 step, mmc_div; |
| 195 | u32 value; |
| 196 | u8 delay; |
| 197 | |
| 198 | value = readl(phase->reg); |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 199 | delay = (value >> phase->offset) & 0x3; |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 200 | |
| 201 | if (!delay) |
| 202 | return 180; |
| 203 | |
| 204 | /* Get the main MMC clock */ |
| 205 | mmc = clk_get_parent(clk); |
| 206 | if (!mmc) |
| 207 | return -EINVAL; |
| 208 | |
| 209 | /* And its rate */ |
| 210 | mmc_rate = clk_get_rate(mmc); |
| 211 | if (!mmc_rate) |
| 212 | return -EINVAL; |
| 213 | |
| 214 | /* Now, get the MMC parent (most likely some PLL) */ |
| 215 | mmc_parent = clk_get_parent(mmc); |
| 216 | if (!mmc_parent) |
| 217 | return -EINVAL; |
| 218 | |
| 219 | /* And its rate */ |
| 220 | mmc_parent_rate = clk_get_rate(mmc_parent); |
| 221 | if (!mmc_parent_rate) |
| 222 | return -EINVAL; |
| 223 | |
| 224 | /* Get MMC clock divider */ |
| 225 | mmc_div = mmc_parent_rate / mmc_rate; |
| 226 | |
| 227 | step = DIV_ROUND_CLOSEST(360, mmc_div); |
| 228 | return delay * step; |
| 229 | } |
| 230 | |
| 231 | static int mmc_set_phase(struct clk_hw *hw, int degrees) |
| 232 | { |
| 233 | struct clk *mmc, *mmc_parent, *clk = hw->clk; |
| 234 | struct mmc_phase *phase = to_mmc_phase(hw); |
| 235 | unsigned int mmc_rate, mmc_parent_rate; |
| 236 | unsigned long flags; |
| 237 | u32 value; |
| 238 | u8 delay; |
| 239 | |
| 240 | /* Get the main MMC clock */ |
| 241 | mmc = clk_get_parent(clk); |
| 242 | if (!mmc) |
| 243 | return -EINVAL; |
| 244 | |
| 245 | /* And its rate */ |
| 246 | mmc_rate = clk_get_rate(mmc); |
| 247 | if (!mmc_rate) |
| 248 | return -EINVAL; |
| 249 | |
| 250 | /* Now, get the MMC parent (most likely some PLL) */ |
| 251 | mmc_parent = clk_get_parent(mmc); |
| 252 | if (!mmc_parent) |
| 253 | return -EINVAL; |
| 254 | |
| 255 | /* And its rate */ |
| 256 | mmc_parent_rate = clk_get_rate(mmc_parent); |
| 257 | if (!mmc_parent_rate) |
| 258 | return -EINVAL; |
| 259 | |
| 260 | if (degrees != 180) { |
| 261 | u16 step, mmc_div; |
| 262 | |
| 263 | /* Get MMC clock divider */ |
| 264 | mmc_div = mmc_parent_rate / mmc_rate; |
| 265 | |
| 266 | /* |
| 267 | * We can only outphase the clocks by multiple of the |
| 268 | * PLL's period. |
| 269 | * |
| 270 | * Since the MMC clock in only a divider, and the |
| 271 | * formula to get the outphasing in degrees is deg = |
| 272 | * 360 * delta / period |
| 273 | * |
| 274 | * If we simplify this formula, we can see that the |
| 275 | * only thing that we're concerned about is the number |
| 276 | * of period we want to outphase our clock from, and |
| 277 | * the divider set by the MMC clock. |
| 278 | */ |
| 279 | step = DIV_ROUND_CLOSEST(360, mmc_div); |
| 280 | delay = DIV_ROUND_CLOSEST(degrees, step); |
| 281 | } else { |
| 282 | delay = 0; |
| 283 | } |
| 284 | |
| 285 | spin_lock_irqsave(phase->lock, flags); |
| 286 | value = readl(phase->reg); |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 287 | value &= ~GENMASK(phase->offset + 3, phase->offset); |
| 288 | value |= delay << phase->offset; |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 289 | writel(value, phase->reg); |
| 290 | spin_unlock_irqrestore(phase->lock, flags); |
| 291 | |
| 292 | return 0; |
| 293 | } |
| 294 | |
| 295 | static const struct clk_ops mmc_clk_ops = { |
| 296 | .get_phase = mmc_get_phase, |
| 297 | .set_phase = mmc_set_phase, |
| 298 | }; |
| 299 | |
Chen-Yu Tsai | eb378df | 2015-01-13 09:37:23 +0800 | [diff] [blame] | 300 | /* |
| 301 | * sunxi_mmc_setup - Common setup function for mmc module clocks |
| 302 | * |
| 303 | * The only difference between module clocks on different platforms is the |
| 304 | * width of the mux register bits and the valid values, which are passed in |
| 305 | * through struct factors_data. The phase clocks parts are identical. |
| 306 | */ |
| 307 | static void __init sunxi_mmc_setup(struct device_node *node, |
| 308 | const struct factors_data *data, |
| 309 | spinlock_t *lock) |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 310 | { |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 311 | struct clk_onecell_data *clk_data; |
| 312 | const char *parent; |
| 313 | void __iomem *reg; |
| 314 | int i; |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 315 | |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 316 | reg = of_io_request_and_map(node, 0, of_node_full_name(node)); |
| 317 | if (IS_ERR(reg)) { |
| 318 | pr_err("Couldn't map the %s clock registers\n", node->name); |
| 319 | return; |
| 320 | } |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 321 | |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 322 | clk_data = kmalloc(sizeof(*clk_data), GFP_KERNEL); |
| 323 | if (!clk_data) |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 324 | return; |
| 325 | |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 326 | clk_data->clks = kcalloc(3, sizeof(*clk_data->clks), GFP_KERNEL); |
| 327 | if (!clk_data->clks) |
| 328 | goto err_free_data; |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 329 | |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 330 | clk_data->clk_num = 3; |
Chen-Yu Tsai | eb378df | 2015-01-13 09:37:23 +0800 | [diff] [blame] | 331 | clk_data->clks[0] = sunxi_factors_register(node, data, lock, reg); |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 332 | if (!clk_data->clks[0]) |
| 333 | goto err_free_clks; |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 334 | |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 335 | parent = __clk_get_name(clk_data->clks[0]); |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 336 | |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 337 | for (i = 1; i < 3; i++) { |
| 338 | struct clk_init_data init = { |
| 339 | .num_parents = 1, |
| 340 | .parent_names = &parent, |
| 341 | .ops = &mmc_clk_ops, |
| 342 | }; |
| 343 | struct mmc_phase *phase; |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 344 | |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 345 | phase = kmalloc(sizeof(*phase), GFP_KERNEL); |
| 346 | if (!phase) |
| 347 | continue; |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 348 | |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 349 | phase->hw.init = &init; |
| 350 | phase->reg = reg; |
Chen-Yu Tsai | eb378df | 2015-01-13 09:37:23 +0800 | [diff] [blame] | 351 | phase->lock = lock; |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 352 | |
| 353 | if (i == 1) |
| 354 | phase->offset = 8; |
| 355 | else |
| 356 | phase->offset = 20; |
| 357 | |
| 358 | if (of_property_read_string_index(node, "clock-output-names", |
| 359 | i, &init.name)) |
| 360 | init.name = node->name; |
| 361 | |
| 362 | clk_data->clks[i] = clk_register(NULL, &phase->hw); |
| 363 | if (IS_ERR(clk_data->clks[i])) { |
| 364 | kfree(phase); |
| 365 | continue; |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | of_clk_add_provider(node, of_clk_src_onecell_get, clk_data); |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 370 | |
| 371 | return; |
| 372 | |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 373 | err_free_clks: |
| 374 | kfree(clk_data->clks); |
| 375 | err_free_data: |
| 376 | kfree(clk_data); |
Maxime Ripard | 37e1041 | 2014-07-11 18:43:18 +0200 | [diff] [blame] | 377 | } |
Chen-Yu Tsai | eb378df | 2015-01-13 09:37:23 +0800 | [diff] [blame] | 378 | |
| 379 | static DEFINE_SPINLOCK(sun4i_a10_mmc_lock); |
| 380 | |
| 381 | static void __init sun4i_a10_mmc_setup(struct device_node *node) |
| 382 | { |
| 383 | sunxi_mmc_setup(node, &sun4i_a10_mod0_data, &sun4i_a10_mmc_lock); |
| 384 | } |
Maxime Ripard | 6b0b8cc | 2014-12-07 17:43:04 +0100 | [diff] [blame] | 385 | CLK_OF_DECLARE(sun4i_a10_mmc, "allwinner,sun4i-a10-mmc-clk", sun4i_a10_mmc_setup); |
Chen-Yu Tsai | 61af4d8 | 2015-01-17 13:19:26 +0800 | [diff] [blame] | 386 | |
| 387 | static DEFINE_SPINLOCK(sun9i_a80_mmc_lock); |
| 388 | |
| 389 | static void __init sun9i_a80_mmc_setup(struct device_node *node) |
| 390 | { |
| 391 | sunxi_mmc_setup(node, &sun9i_a80_mod0_data, &sun9i_a80_mmc_lock); |
| 392 | } |
| 393 | CLK_OF_DECLARE(sun9i_a80_mmc, "allwinner,sun9i-a80-mmc-clk", sun9i_a80_mmc_setup); |