pruss.c 8.36 KB
Newer Older
1 2 3 4 5 6 7 8 9 10
// SPDX-License-Identifier: GPL-2.0-only
/*
 * PRU-ICSS platform driver for various TI SoCs
 *
 * Copyright (C) 2014-2020 Texas Instruments Incorporated - http://www.ti.com/
 * Author(s):
 *	Suman Anna <s-anna@ti.com>
 *	Andrew F. Davis <afd@ti.com>
 */

11
#include <linux/clk-provider.h>
12 13 14 15 16 17 18 19
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/pruss_driver.h>
20 21
#include <linux/regmap.h>
#include <linux/slab.h>
22

23 24 25
/**
 * struct pruss_private_data - PRUSS driver private data
 * @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 29
 */
struct pruss_private_data {
	bool has_no_sharedram;
30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163
	bool has_core_mux_clock;
};

static void pruss_of_free_clk_provider(void *data)
{
	struct device_node *clk_mux_np = data;

	of_clk_del_provider(clk_mux_np);
	of_node_put(clk_mux_np);
}

static int pruss_clk_mux_setup(struct pruss *pruss, struct clk *clk_mux,
			       char *mux_name, struct device_node *clks_np)
{
	struct device_node *clk_mux_np;
	struct device *dev = pruss->dev;
	char *clk_mux_name;
	unsigned int num_parents;
	const char **parent_names;
	void __iomem *reg;
	u32 reg_offset;
	int ret;

	clk_mux_np = of_get_child_by_name(clks_np, mux_name);
	if (!clk_mux_np) {
		dev_err(dev, "%pOF is missing its '%s' node\n", clks_np,
			mux_name);
		return -ENODEV;
	}

	num_parents = of_clk_get_parent_count(clk_mux_np);
	if (num_parents < 1) {
		dev_err(dev, "mux-clock %pOF must have parents\n", clk_mux_np);
		ret = -EINVAL;
		goto put_clk_mux_np;
	}

	parent_names = devm_kcalloc(dev, sizeof(*parent_names), num_parents,
				    GFP_KERNEL);
	if (!parent_names) {
		ret = -ENOMEM;
		goto put_clk_mux_np;
	}

	of_clk_parent_fill(clk_mux_np, parent_names, num_parents);

	clk_mux_name = devm_kasprintf(dev, GFP_KERNEL, "%s.%pOFn",
				      dev_name(dev), clk_mux_np);
	if (!clk_mux_name) {
		ret = -ENOMEM;
		goto put_clk_mux_np;
	}

	ret = of_property_read_u32(clk_mux_np, "reg", &reg_offset);
	if (ret)
		goto put_clk_mux_np;

	reg = pruss->cfg_base + reg_offset;

	clk_mux = clk_register_mux(NULL, clk_mux_name, parent_names,
				   num_parents, 0, reg, 0, 1, 0, NULL);
	if (IS_ERR(clk_mux)) {
		ret = PTR_ERR(clk_mux);
		goto put_clk_mux_np;
	}

	ret = devm_add_action_or_reset(dev, (void(*)(void *))clk_unregister_mux,
				       clk_mux);
	if (ret) {
		dev_err(dev, "failed to add clkmux unregister action %d", ret);
		goto put_clk_mux_np;
	}

	ret = of_clk_add_provider(clk_mux_np, of_clk_src_simple_get, clk_mux);
	if (ret)
		goto put_clk_mux_np;

	ret = devm_add_action_or_reset(dev, pruss_of_free_clk_provider,
				       clk_mux_np);
	if (ret) {
		dev_err(dev, "failed to add clkmux free action %d", ret);
		goto put_clk_mux_np;
	}

	return 0;

put_clk_mux_np:
	of_node_put(clk_mux_np);
	return ret;
}

static int pruss_clk_init(struct pruss *pruss, struct device_node *cfg_node)
{
	const struct pruss_private_data *data;
	struct device_node *clks_np;
	struct device *dev = pruss->dev;
	int ret = 0;

	data = of_device_get_match_data(dev);
	if (IS_ERR(data))
		return -ENODEV;

	clks_np = of_get_child_by_name(cfg_node, "clocks");
	if (!clks_np) {
		dev_err(dev, "%pOF is missing its 'clocks' node\n", clks_np);
		return -ENODEV;
	}

	if (data && data->has_core_mux_clock) {
		ret = pruss_clk_mux_setup(pruss, pruss->core_clk_mux,
					  "coreclk-mux", clks_np);
		if (ret) {
			dev_err(dev, "failed to setup coreclk-mux\n");
			goto put_clks_node;
		}
	}

	ret = pruss_clk_mux_setup(pruss, pruss->iep_clk_mux, "iepclk-mux",
				  clks_np);
	if (ret) {
		dev_err(dev, "failed to setup iepclk-mux\n");
		goto put_clks_node;
	}

put_clks_node:
	of_node_put(clks_np);

	return ret;
}

static struct regmap_config regmap_conf = {
	.reg_bits = 32,
	.val_bits = 32,
	.reg_stride = 4,
164 165
};

166 167 168 169 170 171 172 173
static int pruss_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev_of_node(dev);
	struct device_node *child;
	struct pruss *pruss;
	struct resource res;
	int ret, i, index;
174
	const struct pruss_private_data *data;
175 176
	const char *mem_names[PRUSS_MEM_MAX] = { "dram0", "dram1", "shrdram2" };

177 178 179 180 181 182
	data = of_device_get_match_data(&pdev->dev);
	if (IS_ERR(data)) {
		dev_err(dev, "missing private data\n");
		return -ENODEV;
	}

183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200
	ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
	if (ret) {
		dev_err(dev, "failed to set the DMA coherent mask");
		return ret;
	}

	pruss = devm_kzalloc(dev, sizeof(*pruss), GFP_KERNEL);
	if (!pruss)
		return -ENOMEM;

	pruss->dev = dev;

	child = of_get_child_by_name(np, "memories");
	if (!child) {
		dev_err(dev, "%pOF is missing its 'memories' node\n", child);
		return -ENODEV;
	}

201 202 203 204 205 206 207 208
	for (i = 0; i < PRUSS_MEM_MAX; i++) {
		/*
		 * On AM437x one of two PRUSS units don't contain Shared RAM,
		 * skip it
		 */
		if (data && data->has_no_sharedram && i == PRUSS_MEM_SHRD_RAM2)
			continue;

209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254
		index = of_property_match_string(child, "reg-names",
						 mem_names[i]);
		if (index < 0) {
			of_node_put(child);
			return index;
		}

		if (of_address_to_resource(child, index, &res)) {
			of_node_put(child);
			return -EINVAL;
		}

		pruss->mem_regions[i].va = devm_ioremap(dev, res.start,
							resource_size(&res));
		if (!pruss->mem_regions[i].va) {
			dev_err(dev, "failed to parse and map memory resource %d %s\n",
				i, mem_names[i]);
			of_node_put(child);
			return -ENOMEM;
		}
		pruss->mem_regions[i].pa = res.start;
		pruss->mem_regions[i].size = resource_size(&res);

		dev_dbg(dev, "memory %8s: pa %pa size 0x%zx va %pK\n",
			mem_names[i], &pruss->mem_regions[i].pa,
			pruss->mem_regions[i].size, pruss->mem_regions[i].va);
	}
	of_node_put(child);

	platform_set_drvdata(pdev, pruss);

	pm_runtime_enable(dev);
	ret = pm_runtime_get_sync(dev);
	if (ret < 0) {
		dev_err(dev, "couldn't enable module\n");
		pm_runtime_put_noidle(dev);
		goto rpm_disable;
	}

	child = of_get_child_by_name(np, "cfg");
	if (!child) {
		dev_err(dev, "%pOF is missing its 'cfg' node\n", child);
		ret = -ENODEV;
		goto rpm_put;
	}

255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272
	if (of_address_to_resource(child, 0, &res)) {
		ret = -ENOMEM;
		goto node_put;
	}

	pruss->cfg_base = devm_ioremap(dev, res.start, resource_size(&res));
	if (!pruss->cfg_base) {
		ret = -ENOMEM;
		goto node_put;
	}

	regmap_conf.name = kasprintf(GFP_KERNEL, "%pOFn@%llx", child,
				     (u64)res.start);
	regmap_conf.max_register = resource_size(&res) - 4;

	pruss->cfg_regmap = devm_regmap_init_mmio(dev, pruss->cfg_base,
						  &regmap_conf);
	kfree(regmap_conf.name);
273
	if (IS_ERR(pruss->cfg_regmap)) {
274 275 276 277 278 279 280 281 282 283
		dev_err(dev, "regmap_init_mmio failed for cfg, ret = %ld\n",
			PTR_ERR(pruss->cfg_regmap));
		ret = PTR_ERR(pruss->cfg_regmap);
		goto node_put;
	}

	ret = pruss_clk_init(pruss, child);
	if (ret) {
		dev_err(dev, "failed to setup coreclk-mux\n");
		goto node_put;
284 285 286 287 288
	}

	ret = devm_of_platform_populate(dev);
	if (ret) {
		dev_err(dev, "failed to register child devices\n");
289
		goto node_put;
290 291
	}

292 293
	of_node_put(child);

294 295
	return 0;

296 297
node_put:
	of_node_put(child);
298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316
rpm_put:
	pm_runtime_put_sync(dev);
rpm_disable:
	pm_runtime_disable(dev);
	return ret;
}

static int pruss_remove(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;

	devm_of_platform_depopulate(dev);

	pm_runtime_put_sync(dev);
	pm_runtime_disable(dev);

	return 0;
}

317 318 319 320 321 322 323 324 325
/* instance-specific driver private data */
static const struct pruss_private_data am437x_pruss1_data = {
	.has_no_sharedram = false,
};

static const struct pruss_private_data am437x_pruss0_data = {
	.has_no_sharedram = true,
};

326 327 328 329
static const struct pruss_private_data am65x_j721e_pruss_data = {
	.has_core_mux_clock = true,
};

330 331
static const struct of_device_id pruss_of_match[] = {
	{ .compatible = "ti,am3356-pruss" },
332 333
	{ .compatible = "ti,am4376-pruss0", .data = &am437x_pruss0_data, },
	{ .compatible = "ti,am4376-pruss1", .data = &am437x_pruss1_data, },
334
	{ .compatible = "ti,am5728-pruss" },
335
	{ .compatible = "ti,k2g-pruss" },
336 337
	{ .compatible = "ti,am654-icssg", .data = &am65x_j721e_pruss_data, },
	{ .compatible = "ti,j721e-icssg", .data = &am65x_j721e_pruss_data, },
338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354
	{},
};
MODULE_DEVICE_TABLE(of, pruss_of_match);

static struct platform_driver pruss_driver = {
	.driver = {
		.name = "pruss",
		.of_match_table = pruss_of_match,
	},
	.probe  = pruss_probe,
	.remove = pruss_remove,
};
module_platform_driver(pruss_driver);

MODULE_AUTHOR("Suman Anna <s-anna@ti.com>");
MODULE_DESCRIPTION("PRU-ICSS Subsystem Driver");
MODULE_LICENSE("GPL v2");