target/linux/ipq806x/patches/0171-clk-qcom-Add-Krait-clock-controller-driver.patch

   1 From 6912e27d97ba5671e8c2434bed0ebd23fde5e13d Mon Sep 17 00:00:00 2001
   2 From: Stephen Boyd <sboyd@codeaurora.org>
   3 Date: Wed, 18 Jun 2014 14:29:29 -0700
   4 Subject: [PATCH 171/182] clk: qcom: Add Krait clock controller driver
   5
   6 The Krait CPU clocks are made up of a primary mux and secondary
   7 mux for each CPU and the L2, controlled via cp15 accessors. For
   8 Kraits within KPSSv1 each secondary mux accepts a different aux
   9 source, but on KPSSv2 each secondary mux accepts the same aux
  10 source.
  11
  12 Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
  13 ---
  14  drivers/clk/qcom/Kconfig    |    8 +
  15  drivers/clk/qcom/Makefile   |    1 +
  16  drivers/clk/qcom/krait-cc.c |  364 +++++++++++++++++++++++++++++++++++++++++++
  17  3 files changed, 373 insertions(+)
  18  create mode 100644 drivers/clk/qcom/krait-cc.c
  19
  20 --- a/drivers/clk/qcom/Kconfig
  21 +++ b/drivers/clk/qcom/Kconfig
  22 @@ -70,6 +70,14 @@ config KPSS_XCC
  23           if you want to support CPU frequency scaling on devices such
  24           as MSM8960, APQ8064, etc.
  25
  26 +config KRAITCC
  27 +       tristate "Krait Clock Controller"
  28 +       depends on COMMON_CLK_QCOM && ARM
  29 +       select KRAIT_CLOCKS
  30 +       help
  31 +         Support for the Krait CPU clocks on Qualcomm devices.
  32 +         Say Y if you want to support CPU frequency scaling.
  33 +
  34  config KRAIT_CLOCKS
  35         bool
  36         select KRAIT_L2_ACCESSORS
  37 --- a/drivers/clk/qcom/Makefile
  38 +++ b/drivers/clk/qcom/Makefile
  39 @@ -19,3 +19,4 @@ obj-$(CONFIG_MSM_MMCC_8960) += mmcc-msm8
  40  obj-$(CONFIG_MSM_MMCC_8974) += mmcc-msm8974.o
  41  obj-$(CONFIG_KPSS_XCC) += kpss-xcc.o
  42  obj-$(CONFIG_QCOM_HFPLL) += hfpll.o
  43 +obj-$(CONFIG_KRAITCC) += krait-cc.o
  44 --- /dev/null
  45 +++ b/drivers/clk/qcom/krait-cc.c
  46 @@ -0,0 +1,364 @@
  47 +/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
  48 + *
  49 + * This program is free software; you can redistribute it and/or modify
  50 + * it under the terms of the GNU General Public License version 2 and
  51 + * only version 2 as published by the Free Software Foundation.
  52 + *
  53 + * This program is distributed in the hope that it will be useful,
  54 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  55 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  56 + * GNU General Public License for more details.
  57 + */
  58 +
  59 +#include <linux/kernel.h>
  60 +#include <linux/init.h>
  61 +#include <linux/module.h>
  62 +#include <linux/platform_device.h>
  63 +#include <linux/err.h>
  64 +#include <linux/io.h>
  65 +#include <linux/of.h>
  66 +#include <linux/of_device.h>
  67 +#include <linux/clk.h>
  68 +#include <linux/clk-provider.h>
  69 +#include <linux/slab.h>
  70 +
  71 +#include <asm/smp_plat.h>
  72 +
  73 +#include "clk-krait.h"
  74 +
  75 +DEFINE_FIXED_DIV_CLK(acpu_aux, 2, "gpll0_vote");
  76 +
  77 +static u8 sec_mux_map[] = {
  78 +       2,
  79 +       0,
  80 +};
  81 +
  82 +static u8 pri_mux_map[] = {
  83 +       1,
  84 +       2,
  85 +       0,
  86 +};
  87 +
  88 +static int
  89 +krait_add_div(struct device *dev, int id, const char *s, unsigned offset)
  90 +{
  91 +       struct div_clk *div;
  92 +       struct clk_init_data init = {
  93 +               .num_parents = 1,
  94 +               .ops = &clk_ops_div,
  95 +               .flags = CLK_SET_RATE_PARENT,
  96 +       };
  97 +       const char *p_names[1];
  98 +       struct clk *clk;
  99 +
 100 +       div = devm_kzalloc(dev, sizeof(*dev), GFP_KERNEL);
 101 +       if (!div)
 102 +               return -ENOMEM;
 103 +
 104 +       div->data.div = 2;
 105 +       div->data.min_div = 2;
 106 +       div->data.max_div = 2;
 107 +       div->ops = &clk_div_ops_kpss_div2;
 108 +       div->mask = 0x3;
 109 +       div->shift = 6;
 110 +       div->priv = (void *)(id >= 0);
 111 +       div->offset = offset;
 112 +       div->hw.init = &init;
 113 +
 114 +       init.name = kasprintf(GFP_KERNEL, "hfpll%s_div", s);
 115 +       if (!init.name)
 116 +               return -ENOMEM;
 117 +
 118 +       init.parent_names = p_names;
 119 +       p_names[0] = kasprintf(GFP_KERNEL, "hfpll%s", s);
 120 +       if (!p_names[0]) {
 121 +               kfree(init.name);
 122 +               return -ENOMEM;
 123 +       }
 124 +
 125 +       clk = devm_clk_register(dev, &div->hw);
 126 +       kfree(p_names[0]);
 127 +       kfree(init.name);
 128 +
 129 +       return PTR_ERR_OR_ZERO(clk);
 130 +}
 131 +
 132 +static int
 133 +krait_add_sec_mux(struct device *dev, int id, const char *s, unsigned offset,
 134 +                 bool unique_aux)
 135 +{
 136 +       struct mux_clk *mux;
 137 +       static const char *sec_mux_list[] = {
 138 +               "acpu_aux",
 139 +               "qsb",
 140 +       };
 141 +       struct clk_init_data init = {
 142 +               .parent_names = sec_mux_list,
 143 +               .num_parents = ARRAY_SIZE(sec_mux_list),
 144 +               .ops = &clk_ops_gen_mux,
 145 +               .flags = CLK_SET_RATE_PARENT,
 146 +       };
 147 +       struct clk *clk;
 148 +
 149 +       mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
 150 +       if (!mux)
 151 +               return -ENOMEM;
 152 +
 153 +       mux->offset = offset;
 154 +       mux->priv = (void *)(id >= 0);
 155 +       mux->has_safe_parent = true;
 156 +       mux->safe_sel = 2;
 157 +       mux->ops = &clk_mux_ops_kpss;
 158 +       mux->mask = 0x3;
 159 +       mux->shift = 2;
 160 +       mux->parent_map = sec_mux_map;
 161 +       mux->hw.init = &init;
 162 +
 163 +       init.name = kasprintf(GFP_KERNEL, "krait%s_sec_mux", s);
 164 +       if (!init.name)
 165 +               return -ENOMEM;
 166 +
 167 +       if (unique_aux) {
 168 +               sec_mux_list[0] = kasprintf(GFP_KERNEL, "acpu%s_aux", s);
 169 +               if (!sec_mux_list[0]) {
 170 +                       clk = ERR_PTR(-ENOMEM);
 171 +                       goto err_aux;
 172 +               }
 173 +       }
 174 +
 175 +       clk = devm_clk_register(dev, &mux->hw);
 176 +
 177 +       if (unique_aux)
 178 +               kfree(sec_mux_list[0]);
 179 +err_aux:
 180 +       kfree(init.name);
 181 +       return PTR_ERR_OR_ZERO(clk);
 182 +}
 183 +
 184 +static struct clk *
 185 +krait_add_pri_mux(struct device *dev, int id, const char * s, unsigned offset)
 186 +{
 187 +       struct mux_clk *mux;
 188 +       const char *p_names[3];
 189 +       struct clk_init_data init = {
 190 +               .parent_names = p_names,
 191 +               .num_parents = ARRAY_SIZE(p_names),
 192 +               .ops = &clk_ops_gen_mux,
 193 +               .flags = CLK_SET_RATE_PARENT,
 194 +       };
 195 +       struct clk *clk;
 196 +
 197 +       mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
 198 +       if (!mux)
 199 +               return ERR_PTR(-ENOMEM);
 200 +
 201 +       mux->has_safe_parent = true;
 202 +       mux->safe_sel = 0;
 203 +       mux->ops = &clk_mux_ops_kpss;
 204 +       mux->mask = 0x3;
 205 +       mux->shift = 0;
 206 +       mux->offset = offset;
 207 +       mux->priv = (void *)(id >= 0);
 208 +       mux->parent_map = pri_mux_map;
 209 +       mux->hw.init = &init;
 210 +
 211 +       init.name = kasprintf(GFP_KERNEL, "krait%s_pri_mux", s);
 212 +       if (!init.name)
 213 +               return ERR_PTR(-ENOMEM);
 214 +
 215 +       p_names[0] = kasprintf(GFP_KERNEL, "hfpll%s", s);
 216 +       if (!p_names[0]) {
 217 +               clk = ERR_PTR(-ENOMEM);
 218 +               goto err_p0;
 219 +       }
 220 +
 221 +       p_names[1] = kasprintf(GFP_KERNEL, "hfpll%s_div", s);
 222 +       if (!p_names[1]) {
 223 +               clk = ERR_PTR(-ENOMEM);
 224 +               goto err_p1;
 225 +       }
 226 +
 227 +       p_names[2] = kasprintf(GFP_KERNEL, "krait%s_sec_mux", s);
 228 +       if (!p_names[2]) {
 229 +               clk = ERR_PTR(-ENOMEM);
 230 +               goto err_p2;
 231 +       }
 232 +
 233 +       clk = devm_clk_register(dev, &mux->hw);
 234 +
 235 +       kfree(p_names[2]);
 236 +err_p2:
 237 +       kfree(p_names[1]);
 238 +err_p1:
 239 +       kfree(p_names[0]);
 240 +err_p0:
 241 +       kfree(init.name);
 242 +       return clk;
 243 +}
 244 +
 245 +/* id < 0 for L2, otherwise id == physical CPU number */
 246 +static struct clk *krait_add_clks(struct device *dev, int id, bool unique_aux)
 247 +{
 248 +       int ret;
 249 +       unsigned offset;
 250 +       void *p = NULL;
 251 +       const char *s;
 252 +       struct clk *clk;
 253 +
 254 +       if (id >= 0) {
 255 +               offset = 0x4501 + (0x1000 * id);
 256 +               s = p = kasprintf(GFP_KERNEL, "%d", id);
 257 +               if (!s)
 258 +                       return ERR_PTR(-ENOMEM);
 259 +       } else {
 260 +               offset = 0x500;
 261 +               s = "_l2";
 262 +       }
 263 +
 264 +       ret = krait_add_div(dev, id, s, offset);
 265 +       if (ret) {
 266 +               clk = ERR_PTR(ret);
 267 +               goto err;
 268 +       }
 269 +
 270 +       ret = krait_add_sec_mux(dev, id, s, offset, unique_aux);
 271 +       if (ret) {
 272 +               clk = ERR_PTR(ret);
 273 +               goto err;
 274 +       }
 275 +
 276 +       clk = krait_add_pri_mux(dev, id, s, offset);
 277 +err:
 278 +       kfree(p);
 279 +       return clk;
 280 +}
 281 +
 282 +static struct clk *krait_of_get(struct of_phandle_args *clkspec, void *data)
 283 +{
 284 +       unsigned int idx = clkspec->args[0];
 285 +       struct clk **clks = data;
 286 +
 287 +       if (idx >= 5) {
 288 +               pr_err("%s: invalid clock index %d\n", __func__, idx);
 289 +               return ERR_PTR(-EINVAL);
 290 +       }
 291 +
 292 +       return clks[idx] ? : ERR_PTR(-ENODEV);
 293 +}
 294 +
 295 +static const struct of_device_id krait_cc_match_table[] = {
 296 +       { .compatible = "qcom,krait-cc-v1", (void *)1UL },
 297 +       { .compatible = "qcom,krait-cc-v2" },
 298 +       {}
 299 +};
 300 +MODULE_DEVICE_TABLE(of, krait_cc_match_table);
 301 +
 302 +static int krait_cc_probe(struct platform_device *pdev)
 303 +{
 304 +       struct device *dev = &pdev->dev;
 305 +       const struct of_device_id *id;
 306 +       unsigned long cur_rate, aux_rate;
 307 +       int i, cpu;
 308 +       struct clk *clk;
 309 +       struct clk **clks;
 310 +       struct clk *l2_pri_mux_clk;
 311 +
 312 +       id = of_match_device(krait_cc_match_table, &pdev->dev);
 313 +       if (!id)
 314 +               return -ENODEV;
 315 +
 316 +       /* Rate is 1 because 0 causes problems for __clk_mux_determine_rate */
 317 +       clk = clk_register_fixed_rate(dev, "qsb", NULL, CLK_IS_ROOT, 1);
 318 +       if (IS_ERR(clk))
 319 +               return PTR_ERR(clk);
 320 +
 321 +       if (!id->data) {
 322 +               clk = devm_clk_register(dev, &acpu_aux.hw);
 323 +               if (IS_ERR(clk))
 324 +                       return PTR_ERR(clk);
 325 +       }
 326 +
 327 +       /* Krait configurations have at most 4 CPUs and one L2 */
 328 +       clks = devm_kcalloc(dev, 5, sizeof(*clks), GFP_KERNEL);
 329 +       if (!clks)
 330 +               return -ENOMEM;
 331 +
 332 +       for_each_possible_cpu(i) {
 333 +               cpu = cpu_logical_map(i);
 334 +               clk = krait_add_clks(dev, cpu, id->data);
 335 +               if (IS_ERR(clk))
 336 +                       return PTR_ERR(clk);
 337 +               clks[cpu] = clk;
 338 +       }
 339 +
 340 +       l2_pri_mux_clk = krait_add_clks(dev, -1, id->data);
 341 +       if (IS_ERR(l2_pri_mux_clk))
 342 +               return PTR_ERR(l2_pri_mux_clk);
 343 +       clks[4] = l2_pri_mux_clk;
 344 +
 345 +       /*
 346 +        * We don't want the CPU or L2 clocks to be turned off at late init
 347 +        * if CPUFREQ or HOTPLUG configs are disabled. So, bump up the
 348 +        * refcount of these clocks. Any cpufreq/hotplug manager can assume
 349 +        * that the clocks have already been prepared and enabled by the time
 350 +        * they take over.
 351 +        */
 352 +       for_each_online_cpu(i) {
 353 +               cpu = cpu_logical_map(i);
 354 +               clk_prepare_enable(l2_pri_mux_clk);
 355 +               WARN(clk_prepare_enable(clks[cpu]),
 356 +                       "Unable to turn on CPU%d clock", cpu);
 357 +       }
 358 +
 359 +       /*
 360 +        * Force reinit of HFPLLs and muxes to overwrite any potential
 361 +        * incorrect configuration of HFPLLs and muxes by the bootloader.
 362 +        * While at it, also make sure the cores are running at known rates
 363 +        * and print the current rate.
 364 +        *
 365 +        * The clocks are set to aux clock rate first to make sure the
 366 +        * secondary mux is not sourcing off of QSB. The rate is then set to
 367 +        * two different rates to force a HFPLL reinit under all
 368 +        * circumstances.
 369 +        */
 370 +       cur_rate = clk_get_rate(l2_pri_mux_clk);
 371 +       aux_rate = 384000000;
 372 +       if (cur_rate == 1) {
 373 +               pr_info("L2 @ QSB rate. Forcing new rate.\n");
 374 +               cur_rate = aux_rate;
 375 +       }
 376 +       clk_set_rate(l2_pri_mux_clk, aux_rate);
 377 +       clk_set_rate(l2_pri_mux_clk, 2);
 378 +       clk_set_rate(l2_pri_mux_clk, cur_rate);
 379 +       pr_info("L2 @ %lu KHz\n", clk_get_rate(l2_pri_mux_clk) / 1000);
 380 +       for_each_possible_cpu(i) {
 381 +               cpu = cpu_logical_map(i);
 382 +               clk = clks[cpu];
 383 +               cur_rate = clk_get_rate(clk);
 384 +               if (cur_rate == 1) {
 385 +                       pr_info("CPU%d @ QSB rate. Forcing new rate.\n", i);
 386 +                       cur_rate = aux_rate;
 387 +               }
 388 +               clk_set_rate(clk, aux_rate);
 389 +               clk_set_rate(clk, 2);
 390 +               clk_set_rate(clk, cur_rate);
 391 +               pr_info("CPU%d @ %lu KHz\n", i, clk_get_rate(clk) / 1000);
 392 +       }
 393 +
 394 +       of_clk_add_provider(dev->of_node, krait_of_get, clks);
 395 +
 396 +       return 0;
 397 +}
 398 +
 399 +static struct platform_driver krait_cc_driver = {
 400 +       .probe = krait_cc_probe,
 401 +       .driver = {
 402 +               .name = "clock-krait",
 403 +               .of_match_table = krait_cc_match_table,
 404 +               .owner = THIS_MODULE,
 405 +       },
 406 +};
 407 +module_platform_driver(krait_cc_driver);
 408 +
 409 +MODULE_DESCRIPTION("Krait CPU Clock Driver");
 410 +MODULE_LICENSE("GPL v2");