drivers/soc/ti/pruss.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * PRU-ICSS platform driver for various TI SoCs
   4  *
   5  * Copyright (C) 2014-2020 Texas Instruments Incorporated - http://www.ti.com/
   6  * Author(s):
   7  *      Suman Anna <[email protected]>
   8  *      Andrew F. Davis <[email protected]>
   9  */
  10
  11 #include <linux/clk-provider.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/io.h>
  14 #include <linux/mfd/syscon.h>
  15 #include <linux/module.h>
  16 #include <linux/of_address.h>
  17 #include <linux/of_device.h>
  18 #include <linux/pm_runtime.h>
  19 #include <linux/pruss_driver.h>
  20 #include <linux/regmap.h>
  21 #include <linux/slab.h>
  22
  23 /**
  24  * struct pruss_private_data - PRUSS driver private data
  25  * @has_no_sharedram: flag to indicate the absence of PRUSS Shared Data RAM
  26  * @has_core_mux_clock: flag to indicate the presence of PRUSS core clock
  27  */
  28 struct pruss_private_data {
  29         bool has_no_sharedram;
  30         bool has_core_mux_clock;
  31 };
  32
  33 static void pruss_of_free_clk_provider(void *data)
  34 {
  35         struct device_node *clk_mux_np = data;
  36
  37         of_clk_del_provider(clk_mux_np);
  38         of_node_put(clk_mux_np);
  39 }
  40
  41 static int pruss_clk_mux_setup(struct pruss *pruss, struct clk *clk_mux,
  42                                char *mux_name, struct device_node *clks_np)
  43 {
  44         struct device_node *clk_mux_np;
  45         struct device *dev = pruss->dev;
  46         char *clk_mux_name;
  47         unsigned int num_parents;
  48         const char **parent_names;
  49         void __iomem *reg;
  50         u32 reg_offset;
  51         int ret;
  52
  53         clk_mux_np = of_get_child_by_name(clks_np, mux_name);
  54         if (!clk_mux_np) {
  55                 dev_err(dev, "%pOF is missing its '%s' node\n", clks_np,
  56                         mux_name);
  57                 return -ENODEV;
  58         }
  59
  60         num_parents = of_clk_get_parent_count(clk_mux_np);
  61         if (num_parents < 1) {
  62                 dev_err(dev, "mux-clock %pOF must have parents\n", clk_mux_np);
  63                 ret = -EINVAL;
  64                 goto put_clk_mux_np;
  65         }
  66
  67         parent_names = devm_kcalloc(dev, sizeof(*parent_names), num_parents,
  68                                     GFP_KERNEL);
  69         if (!parent_names) {
  70                 ret = -ENOMEM;
  71                 goto put_clk_mux_np;
  72         }
  73
  74         of_clk_parent_fill(clk_mux_np, parent_names, num_parents);
  75
  76         clk_mux_name = devm_kasprintf(dev, GFP_KERNEL, "%s.%pOFn",
  77                                       dev_name(dev), clk_mux_np);
  78         if (!clk_mux_name) {
  79                 ret = -ENOMEM;
  80                 goto put_clk_mux_np;
  81         }
  82
  83         ret = of_property_read_u32(clk_mux_np, "reg", &reg_offset);
  84         if (ret)
  85                 goto put_clk_mux_np;
  86
  87         reg = pruss->cfg_base + reg_offset;
  88
  89         clk_mux = clk_register_mux(NULL, clk_mux_name, parent_names,
  90                                    num_parents, 0, reg, 0, 1, 0, NULL);
  91         if (IS_ERR(clk_mux)) {
  92                 ret = PTR_ERR(clk_mux);
  93                 goto put_clk_mux_np;
  94         }
  95
  96         ret = devm_add_action_or_reset(dev, (void(*)(void *))clk_unregister_mux,
  97                                        clk_mux);
  98         if (ret) {
  99                 dev_err(dev, "failed to add clkmux unregister action %d", ret);
 100                 goto put_clk_mux_np;
 101         }
 102
 103         ret = of_clk_add_provider(clk_mux_np, of_clk_src_simple_get, clk_mux);
 104         if (ret)
 105                 goto put_clk_mux_np;
 106
 107         ret = devm_add_action_or_reset(dev, pruss_of_free_clk_provider,
 108                                        clk_mux_np);
 109         if (ret) {
 110                 dev_err(dev, "failed to add clkmux free action %d", ret);
 111                 goto put_clk_mux_np;
 112         }
 113
 114         return 0;
 115
 116 put_clk_mux_np:
 117         of_node_put(clk_mux_np);
 118         return ret;
 119 }
 120
 121 static int pruss_clk_init(struct pruss *pruss, struct device_node *cfg_node)
 122 {
 123         const struct pruss_private_data *data;
 124         struct device_node *clks_np;
 125         struct device *dev = pruss->dev;
 126         int ret = 0;
 127
 128         data = of_device_get_match_data(dev);
 129
 130         clks_np = of_get_child_by_name(cfg_node, "clocks");
 131         if (!clks_np) {
 132                 dev_err(dev, "%pOF is missing its 'clocks' node\n", cfg_node);
 133                 return -ENODEV;
 134         }
 135
 136         if (data && data->has_core_mux_clock) {
 137                 ret = pruss_clk_mux_setup(pruss, pruss->core_clk_mux,
 138                                           "coreclk-mux", clks_np);
 139                 if (ret) {
 140                         dev_err(dev, "failed to setup coreclk-mux\n");
 141                         goto put_clks_node;
 142                 }
 143         }
 144
 145         ret = pruss_clk_mux_setup(pruss, pruss->iep_clk_mux, "iepclk-mux",
 146                                   clks_np);
 147         if (ret) {
 148                 dev_err(dev, "failed to setup iepclk-mux\n");
 149                 goto put_clks_node;
 150         }
 151
 152 put_clks_node:
 153         of_node_put(clks_np);
 154
 155         return ret;
 156 }
 157
 158 static struct regmap_config regmap_conf = {
 159         .reg_bits = 32,
 160         .val_bits = 32,
 161         .reg_stride = 4,
 162 };
 163
 164 static int pruss_cfg_of_init(struct device *dev, struct pruss *pruss)
 165 {
 166         struct device_node *np = dev_of_node(dev);
 167         struct device_node *child;
 168         struct resource res;
 169         int ret;
 170
 171         child = of_get_child_by_name(np, "cfg");
 172         if (!child) {
 173                 dev_err(dev, "%pOF is missing its 'cfg' node\n", child);
 174                 return -ENODEV;
 175         }
 176
 177         if (of_address_to_resource(child, 0, &res)) {
 178                 ret = -ENOMEM;
 179                 goto node_put;
 180         }
 181
 182         pruss->cfg_base = devm_ioremap(dev, res.start, resource_size(&res));
 183         if (!pruss->cfg_base) {
 184                 ret = -ENOMEM;
 185                 goto node_put;
 186         }
 187
 188         regmap_conf.name = kasprintf(GFP_KERNEL, "%pOFn@%llx", child,
 189                                      (u64)res.start);
 190         regmap_conf.max_register = resource_size(&res) - 4;
 191
 192         pruss->cfg_regmap = devm_regmap_init_mmio(dev, pruss->cfg_base,
 193                                                   &regmap_conf);
 194         kfree(regmap_conf.name);
 195         if (IS_ERR(pruss->cfg_regmap)) {
 196                 dev_err(dev, "regmap_init_mmio failed for cfg, ret = %ld\n",
 197                         PTR_ERR(pruss->cfg_regmap));
 198                 ret = PTR_ERR(pruss->cfg_regmap);
 199                 goto node_put;
 200         }
 201
 202         ret = pruss_clk_init(pruss, child);
 203         if (ret)
 204                 dev_err(dev, "pruss_clk_init failed, ret = %d\n", ret);
 205
 206 node_put:
 207         of_node_put(child);
 208         return ret;
 209 }
 210
 211 static int pruss_probe(struct platform_device *pdev)
 212 {
 213         struct device *dev = &pdev->dev;
 214         struct device_node *np = dev_of_node(dev);
 215         struct device_node *child;
 216         struct pruss *pruss;
 217         struct resource res;
 218         int ret, i, index;
 219         const struct pruss_private_data *data;
 220         const char *mem_names[PRUSS_MEM_MAX] = { "dram0", "dram1", "shrdram2" };
 221
 222         data = of_device_get_match_data(&pdev->dev);
 223
 224         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 225         if (ret) {
 226                 dev_err(dev, "failed to set the DMA coherent mask");
 227                 return ret;
 228         }
 229
 230         pruss = devm_kzalloc(dev, sizeof(*pruss), GFP_KERNEL);
 231         if (!pruss)
 232                 return -ENOMEM;
 233
 234         pruss->dev = dev;
 235
 236         child = of_get_child_by_name(np, "memories");
 237         if (!child) {
 238                 dev_err(dev, "%pOF is missing its 'memories' node\n", child);
 239                 return -ENODEV;
 240         }
 241
 242         for (i = 0; i < PRUSS_MEM_MAX; i++) {
 243                 /*
 244                  * On AM437x one of two PRUSS units don't contain Shared RAM,
 245                  * skip it
 246                  */
 247                 if (data && data->has_no_sharedram && i == PRUSS_MEM_SHRD_RAM2)
 248                         continue;
 249
 250                 index = of_property_match_string(child, "reg-names",
 251                                                  mem_names[i]);
 252                 if (index < 0) {
 253                         of_node_put(child);
 254                         return index;
 255                 }
 256
 257                 if (of_address_to_resource(child, index, &res)) {
 258                         of_node_put(child);
 259                         return -EINVAL;
 260                 }
 261
 262                 pruss->mem_regions[i].va = devm_ioremap(dev, res.start,
 263                                                         resource_size(&res));
 264                 if (!pruss->mem_regions[i].va) {
 265                         dev_err(dev, "failed to parse and map memory resource %d %s\n",
 266                                 i, mem_names[i]);
 267                         of_node_put(child);
 268                         return -ENOMEM;
 269                 }
 270                 pruss->mem_regions[i].pa = res.start;
 271                 pruss->mem_regions[i].size = resource_size(&res);
 272
 273                 dev_dbg(dev, "memory %8s: pa %pa size 0x%zx va %pK\n",
 274                         mem_names[i], &pruss->mem_regions[i].pa,
 275                         pruss->mem_regions[i].size, pruss->mem_regions[i].va);
 276         }
 277         of_node_put(child);
 278
 279         platform_set_drvdata(pdev, pruss);
 280
 281         pm_runtime_enable(dev);
 282         ret = pm_runtime_resume_and_get(dev);
 283         if (ret < 0) {
 284                 dev_err(dev, "couldn't enable module\n");
 285                 goto rpm_disable;
 286         }
 287
 288         ret = pruss_cfg_of_init(dev, pruss);
 289         if (ret < 0)
 290                 goto rpm_put;
 291
 292         ret = devm_of_platform_populate(dev);
 293         if (ret) {
 294                 dev_err(dev, "failed to register child devices\n");
 295                 goto rpm_put;
 296         }
 297
 298         return 0;
 299
 300 rpm_put:
 301         pm_runtime_put_sync(dev);
 302 rpm_disable:
 303         pm_runtime_disable(dev);
 304         return ret;
 305 }
 306
 307 static int pruss_remove(struct platform_device *pdev)
 308 {
 309         struct device *dev = &pdev->dev;
 310
 311         devm_of_platform_depopulate(dev);
 312
 313         pm_runtime_put_sync(dev);
 314         pm_runtime_disable(dev);
 315
 316         return 0;
 317 }
 318
 319 /* instance-specific driver private data */
 320 static const struct pruss_private_data am437x_pruss1_data = {
 321         .has_no_sharedram = false,
 322 };
 323
 324 static const struct pruss_private_data am437x_pruss0_data = {
 325         .has_no_sharedram = true,
 326 };
 327
 328 static const struct pruss_private_data am65x_j721e_pruss_data = {
 329         .has_core_mux_clock = true,
 330 };
 331
 332 static const struct of_device_id pruss_of_match[] = {
 333         { .compatible = "ti,am3356-pruss" },
 334         { .compatible = "ti,am4376-pruss0", .data = &am437x_pruss0_data, },
 335         { .compatible = "ti,am4376-pruss1", .data = &am437x_pruss1_data, },
 336         { .compatible = "ti,am5728-pruss" },
 337         { .compatible = "ti,k2g-pruss" },
 338         { .compatible = "ti,am654-icssg", .data = &am65x_j721e_pruss_data, },
 339         { .compatible = "ti,j721e-icssg", .data = &am65x_j721e_pruss_data, },
 340         { .compatible = "ti,am642-icssg", .data = &am65x_j721e_pruss_data, },
 341         { .compatible = "ti,am625-pruss", .data = &am65x_j721e_pruss_data, },
 342         {},
 343 };
 344 MODULE_DEVICE_TABLE(of, pruss_of_match);
 345
 346 static struct platform_driver pruss_driver = {
 347         .driver = {
 348                 .name = "pruss",
 349                 .of_match_table = pruss_of_match,
 350         },
 351         .probe  = pruss_probe,
 352         .remove = pruss_remove,
 353 };
 354 module_platform_driver(pruss_driver);
 355
 356 MODULE_AUTHOR("Suman Anna <[email protected]>");
 357 MODULE_DESCRIPTION("PRU-ICSS Subsystem Driver");
 358 MODULE_LICENSE("GPL v2");