3  * Generic on-chip SRAM allocation driver
21 #include "sram.h"
55 static int sram_add_pool(struct sram_dev *sram, struct sram_reserve *block,  in sram_add_pool()  argument
60 	part->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),  in sram_add_pool()
68 		dev_err(sram->dev, "failed to register subpool: %d\n", ret);  in sram_add_pool()
75 static int sram_add_export(struct sram_dev *sram, struct sram_reserve *block,  in sram_add_export()  argument
79 	part->battr.attr.name = devm_kasprintf(sram->dev, GFP_KERNEL,  in sram_add_export()
80 					       "%llx.sram",  in sram_add_export()
90 	return device_create_bin_file(sram->dev, &part->battr);  in sram_add_export()
93 static int sram_add_partition(struct sram_dev *sram, struct sram_reserve *block,  in sram_add_partition()  argument
97 	struct sram_partition *part = &sram->partition[sram->partitions];  in sram_add_partition()
100 	part->base = sram->virt_base + block->start;  in sram_add_partition()
103 		ret = sram_add_pool(sram, block, start, part);  in sram_add_partition()
108 		ret = sram_add_export(sram, block, start, part);  in sram_add_partition()
113 		ret = sram_check_protect_exec(sram, block, part);  in sram_add_partition()
117 		ret = sram_add_pool(sram, block, start, part);  in sram_add_partition()
124 	sram->partitions++;  in sram_add_partition()
129 static void sram_free_partitions(struct sram_dev *sram)  in sram_free_partitions()  argument
133 	if (!sram->partitions)  in sram_free_partitions()
136 	part = &sram->partition[sram->partitions - 1];  in sram_free_partitions()
137 	for (; sram->partitions; sram->partitions--, part--) {  in sram_free_partitions()
139 			device_remove_bin_file(sram->dev, &part->battr);  in sram_free_partitions()
143 			dev_err(sram->dev, "removed pool while SRAM allocated\n");  in sram_free_partitions()
156 static int sram_reserve_regions(struct sram_dev *sram, struct resource *res)  in sram_reserve_regions()  argument
158 	struct device_node *np = sram->dev->of_node, *child;  in sram_reserve_regions()
185 			dev_err(sram->dev,  in sram_reserve_regions()
192 			dev_err(sram->dev,  in sram_reserve_regions()
193 				"reserved block %pOF outside the sram area\n",  in sram_reserve_regions()
219 				dev_err(sram->dev,  in sram_reserve_regions()
227 			block->label = devm_kstrdup(sram->dev,  in sram_reserve_regions()
234 			dev_dbg(sram->dev, "found %sblock '%s' 0x%x-0x%x\n",  in sram_reserve_regions()
238 			dev_dbg(sram->dev, "found reserved block 0x%x-0x%x\n",  in sram_reserve_regions()
254 		sram->partition = devm_kcalloc(sram->dev,  in sram_reserve_regions()
255 				       exports, sizeof(*sram->partition),  in sram_reserve_regions()
257 		if (!sram->partition) {  in sram_reserve_regions()
267 			dev_err(sram->dev,  in sram_reserve_regions()
271 			sram_free_partitions(sram);  in sram_reserve_regions()
277 			ret = sram_add_partition(sram, block,  in sram_reserve_regions()
280 				sram_free_partitions(sram);  in sram_reserve_regions()
298 		dev_dbg(sram->dev, "adding chunk 0x%lx-0x%lx\n",  in sram_reserve_regions()
301 		ret = gen_pool_add_virt(sram->pool,  in sram_reserve_regions()
302 				(unsigned long)sram->virt_base + cur_start,  in sram_reserve_regions()
305 			sram_free_partitions(sram);  in sram_reserve_regions()
335 	{ .compatible = "mmio-sram" },
342 	struct sram_dev *sram;  in sram_probe()  local
346 	sram = devm_kzalloc(&pdev->dev, sizeof(*sram), GFP_KERNEL);  in sram_probe()
347 	if (!sram)  in sram_probe()
350 	sram->dev = &pdev->dev;  in sram_probe()
353 		sram->virt_base = devm_platform_ioremap_resource(pdev, 0);  in sram_probe()
355 		sram->virt_base = devm_platform_ioremap_resource_wc(pdev, 0);  in sram_probe()
356 	if (IS_ERR(sram->virt_base)) {  in sram_probe()
357 		dev_err(&pdev->dev, "could not map SRAM registers\n");  in sram_probe()
358 		return PTR_ERR(sram->virt_base);  in sram_probe()
361 	sram->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),  in sram_probe()
363 	if (IS_ERR(sram->pool))  in sram_probe()
364 		return PTR_ERR(sram->pool);  in sram_probe()
366 	sram->clk = devm_clk_get(sram->dev, NULL);  in sram_probe()
367 	if (IS_ERR(sram->clk))  in sram_probe()
368 		sram->clk = NULL;  in sram_probe()
370 		clk_prepare_enable(sram->clk);  in sram_probe()
372 	ret = sram_reserve_regions(sram,  in sram_probe()
377 	platform_set_drvdata(pdev, sram);  in sram_probe()
386 	dev_dbg(sram->dev, "SRAM pool: %zu KiB @ 0x%p\n",  in sram_probe()
387 		gen_pool_size(sram->pool) / 1024, sram->virt_base);  in sram_probe()
392 	sram_free_partitions(sram);  in sram_probe()
394 	if (sram->clk)  in sram_probe()
395 		clk_disable_unprepare(sram->clk);  in sram_probe()
402 	struct sram_dev *sram = platform_get_drvdata(pdev);  in sram_remove()  local
404 	sram_free_partitions(sram);  in sram_remove()
406 	if (gen_pool_avail(sram->pool) < gen_pool_size(sram->pool))  in sram_remove()
407 		dev_err(sram->dev, "removed while SRAM allocated\n");  in sram_remove()
409 	if (sram->clk)  in sram_remove()
410 		clk_disable_unprepare(sram->clk);  in sram_remove()
417 		.name = "sram",