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 <s-anna@ti.com> 8 * Andrew F. Davis <afd@ti.com> 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 */ 28struct pruss_private_data { 29 bool has_no_sharedram; 30 bool has_core_mux_clock; 31}; 32 33static 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 41static 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", ®_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 116put_clk_mux_np: 117 of_node_put(clk_mux_np); 118 return ret; 119} 120 121static 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 if (IS_ERR(data)) 130 return -ENODEV; 131 132 clks_np = of_get_child_by_name(cfg_node, "clocks"); 133 if (!clks_np) { 134 dev_err(dev, "%pOF is missing its 'clocks' node\n", cfg_node); 135 return -ENODEV; 136 } 137 138 if (data && data->has_core_mux_clock) { 139 ret = pruss_clk_mux_setup(pruss, pruss->core_clk_mux, 140 "coreclk-mux", clks_np); 141 if (ret) { 142 dev_err(dev, "failed to setup coreclk-mux\n"); 143 goto put_clks_node; 144 } 145 } 146 147 ret = pruss_clk_mux_setup(pruss, pruss->iep_clk_mux, "iepclk-mux", 148 clks_np); 149 if (ret) { 150 dev_err(dev, "failed to setup iepclk-mux\n"); 151 goto put_clks_node; 152 } 153 154put_clks_node: 155 of_node_put(clks_np); 156 157 return ret; 158} 159 160static struct regmap_config regmap_conf = { 161 .reg_bits = 32, 162 .val_bits = 32, 163 .reg_stride = 4, 164}; 165 166static int pruss_probe(struct platform_device *pdev) 167{ 168 struct device *dev = &pdev->dev; 169 struct device_node *np = dev_of_node(dev); 170 struct device_node *child; 171 struct pruss *pruss; 172 struct resource res; 173 int ret, i, index; 174 const struct pruss_private_data *data; 175 const char *mem_names[PRUSS_MEM_MAX] = { "dram0", "dram1", "shrdram2" }; 176 177 data = of_device_get_match_data(&pdev->dev); 178 if (IS_ERR(data)) { 179 dev_err(dev, "missing private data\n"); 180 return -ENODEV; 181 } 182 183 ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 184 if (ret) { 185 dev_err(dev, "failed to set the DMA coherent mask"); 186 return ret; 187 } 188 189 pruss = devm_kzalloc(dev, sizeof(*pruss), GFP_KERNEL); 190 if (!pruss) 191 return -ENOMEM; 192 193 pruss->dev = dev; 194 195 child = of_get_child_by_name(np, "memories"); 196 if (!child) { 197 dev_err(dev, "%pOF is missing its 'memories' node\n", child); 198 return -ENODEV; 199 } 200 201 for (i = 0; i < PRUSS_MEM_MAX; i++) { 202 /* 203 * On AM437x one of two PRUSS units don't contain Shared RAM, 204 * skip it 205 */ 206 if (data && data->has_no_sharedram && i == PRUSS_MEM_SHRD_RAM2) 207 continue; 208 209 index = of_property_match_string(child, "reg-names", 210 mem_names[i]); 211 if (index < 0) { 212 of_node_put(child); 213 return index; 214 } 215 216 if (of_address_to_resource(child, index, &res)) { 217 of_node_put(child); 218 return -EINVAL; 219 } 220 221 pruss->mem_regions[i].va = devm_ioremap(dev, res.start, 222 resource_size(&res)); 223 if (!pruss->mem_regions[i].va) { 224 dev_err(dev, "failed to parse and map memory resource %d %s\n", 225 i, mem_names[i]); 226 of_node_put(child); 227 return -ENOMEM; 228 } 229 pruss->mem_regions[i].pa = res.start; 230 pruss->mem_regions[i].size = resource_size(&res); 231 232 dev_dbg(dev, "memory %8s: pa %pa size 0x%zx va %pK\n", 233 mem_names[i], &pruss->mem_regions[i].pa, 234 pruss->mem_regions[i].size, pruss->mem_regions[i].va); 235 } 236 of_node_put(child); 237 238 platform_set_drvdata(pdev, pruss); 239 240 pm_runtime_enable(dev); 241 ret = pm_runtime_get_sync(dev); 242 if (ret < 0) { 243 dev_err(dev, "couldn't enable module\n"); 244 pm_runtime_put_noidle(dev); 245 goto rpm_disable; 246 } 247 248 child = of_get_child_by_name(np, "cfg"); 249 if (!child) { 250 dev_err(dev, "%pOF is missing its 'cfg' node\n", child); 251 ret = -ENODEV; 252 goto rpm_put; 253 } 254 255 if (of_address_to_resource(child, 0, &res)) { 256 ret = -ENOMEM; 257 goto node_put; 258 } 259 260 pruss->cfg_base = devm_ioremap(dev, res.start, resource_size(&res)); 261 if (!pruss->cfg_base) { 262 ret = -ENOMEM; 263 goto node_put; 264 } 265 266 regmap_conf.name = kasprintf(GFP_KERNEL, "%pOFn@%llx", child, 267 (u64)res.start); 268 regmap_conf.max_register = resource_size(&res) - 4; 269 270 pruss->cfg_regmap = devm_regmap_init_mmio(dev, pruss->cfg_base, 271 ®map_conf); 272 kfree(regmap_conf.name); 273 if (IS_ERR(pruss->cfg_regmap)) { 274 dev_err(dev, "regmap_init_mmio failed for cfg, ret = %ld\n", 275 PTR_ERR(pruss->cfg_regmap)); 276 ret = PTR_ERR(pruss->cfg_regmap); 277 goto node_put; 278 } 279 280 ret = pruss_clk_init(pruss, child); 281 if (ret) { 282 dev_err(dev, "failed to setup coreclk-mux\n"); 283 goto node_put; 284 } 285 286 ret = devm_of_platform_populate(dev); 287 if (ret) { 288 dev_err(dev, "failed to register child devices\n"); 289 goto node_put; 290 } 291 292 of_node_put(child); 293 294 return 0; 295 296node_put: 297 of_node_put(child); 298rpm_put: 299 pm_runtime_put_sync(dev); 300rpm_disable: 301 pm_runtime_disable(dev); 302 return ret; 303} 304 305static int pruss_remove(struct platform_device *pdev) 306{ 307 struct device *dev = &pdev->dev; 308 309 devm_of_platform_depopulate(dev); 310 311 pm_runtime_put_sync(dev); 312 pm_runtime_disable(dev); 313 314 return 0; 315} 316 317/* instance-specific driver private data */ 318static const struct pruss_private_data am437x_pruss1_data = { 319 .has_no_sharedram = false, 320}; 321 322static const struct pruss_private_data am437x_pruss0_data = { 323 .has_no_sharedram = true, 324}; 325 326static const struct pruss_private_data am65x_j721e_pruss_data = { 327 .has_core_mux_clock = true, 328}; 329 330static const struct of_device_id pruss_of_match[] = { 331 { .compatible = "ti,am3356-pruss" }, 332 { .compatible = "ti,am4376-pruss0", .data = &am437x_pruss0_data, }, 333 { .compatible = "ti,am4376-pruss1", .data = &am437x_pruss1_data, }, 334 { .compatible = "ti,am5728-pruss" }, 335 { .compatible = "ti,k2g-pruss" }, 336 { .compatible = "ti,am654-icssg", .data = &am65x_j721e_pruss_data, }, 337 { .compatible = "ti,j721e-icssg", .data = &am65x_j721e_pruss_data, }, 338 {}, 339}; 340MODULE_DEVICE_TABLE(of, pruss_of_match); 341 342static struct platform_driver pruss_driver = { 343 .driver = { 344 .name = "pruss", 345 .of_match_table = pruss_of_match, 346 }, 347 .probe = pruss_probe, 348 .remove = pruss_remove, 349}; 350module_platform_driver(pruss_driver); 351 352MODULE_AUTHOR("Suman Anna <s-anna@ti.com>"); 353MODULE_DESCRIPTION("PRU-ICSS Subsystem Driver"); 354MODULE_LICENSE("GPL v2"); 355