1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * Copyright (C) 2012 Texas Instruments Incorporated - https://www.ti.com/
8 #define DRIVER_NAME	"omap-elm"
50 /* ELM_ERROR_LOCATION_0-15 Registers */
87 	writel(val, info->elm_base + offset);  in elm_write_reg()
92 	return readl(info->elm_base + offset);  in elm_read_reg()
96  * elm_config - Configure ELM module
110 		dev_err(dev, "Unable to configure elm - device not probed?\n");  in elm_config()
111 		return -EPROBE_DEFER;  in elm_config()
115 		dev_err(dev, "unsupported config ecc-size=%d\n", ecc_step_size);  in elm_config()
116 		return -EINVAL;  in elm_config()
120 		dev_err(dev, "unsupported config ecc-step=%d\n", ecc_steps);  in elm_config()
121 		return -EINVAL;  in elm_config()
126 	info->bch_type		= bch_type;  in elm_config()
127 	info->ecc_steps		= ecc_steps;  in elm_config()
128 	info->ecc_syndrome_size	= ecc_syndrome_size;  in elm_config()
135  * elm_configure_page_mode - Enable/Disable page mode
157  * elm_load_syndrome - Load ELM syndrome reg
170 	for (i = 0; i < info->ecc_steps; i++) {  in elm_load_syndrome()
177 			switch (info->bch_type) {  in elm_load_syndrome()
179 				/* syndrome fragment 0 = ecc[9-12B] */  in elm_load_syndrome()
183 				/* syndrome fragment 1 = ecc[5-8B] */  in elm_load_syndrome()
188 				/* syndrome fragment 2 = ecc[1-4B] */  in elm_load_syndrome()
199 				/* syndrome fragment 0 = ecc[20-52b] bits */  in elm_load_syndrome()
204 				/* syndrome fragment 1 = ecc[0-20b] bits */  in elm_load_syndrome()
237 		ecc += info->ecc_syndrome_size;  in elm_load_syndrome()
242  * elm_start_processing - start elm syndrome processing
260 	for (i = 0; i < info->ecc_steps; i++) {  in elm_start_processing()
272  * elm_error_correction - locate correctable error position
289 	for (i = 0; i < info->ecc_steps; i++) {  in elm_error_correction()
329  * elm_decode_bch_error_page - Locate error position
331  * @ecc_calc:	calculated ECC bytes from GPMC
355 	wait_for_completion(&info->elm_completion);  in elm_decode_bch_error_page()
375 		complete(&info->elm_completion);  in elm_isr()
388 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);  in elm_probe()
390 		return -ENOMEM;  in elm_probe()
392 	info->dev = &pdev->dev;  in elm_probe()
398 	info->elm_base = devm_platform_ioremap_resource(pdev, 0);  in elm_probe()
399 	if (IS_ERR(info->elm_base))  in elm_probe()
400 		return PTR_ERR(info->elm_base);  in elm_probe()
402 	ret = devm_request_irq(&pdev->dev, irq, elm_isr, 0,  in elm_probe()
403 			       pdev->name, info);  in elm_probe()
405 		dev_err(&pdev->dev, "failure requesting %d\n", irq);  in elm_probe()
409 	pm_runtime_enable(&pdev->dev);  in elm_probe()
410 	if (pm_runtime_get_sync(&pdev->dev) < 0) {  in elm_probe()
411 		ret = -EINVAL;  in elm_probe()
412 		pm_runtime_put_sync(&pdev->dev);  in elm_probe()
413 		pm_runtime_disable(&pdev->dev);  in elm_probe()
414 		dev_err(&pdev->dev, "can't enable clock\n");  in elm_probe()
418 	init_completion(&info->elm_completion);  in elm_probe()
419 	INIT_LIST_HEAD(&info->list);  in elm_probe()
420 	list_add(&info->list, &elm_devices);  in elm_probe()
427 	pm_runtime_put_sync(&pdev->dev);  in elm_remove()
428 	pm_runtime_disable(&pdev->dev);  in elm_remove()
435  * saves ELM configurations to preserve them across Hardware powered-down
439 	struct elm_registers *regs = &info->elm_regs;  in elm_context_save()
440 	enum bch_ecc bch_type = info->bch_type;  in elm_context_save()
443 	regs->elm_irqenable       = elm_read_reg(info, ELM_IRQENABLE);  in elm_context_save()
444 	regs->elm_sysconfig       = elm_read_reg(info, ELM_SYSCONFIG);  in elm_context_save()
445 	regs->elm_location_config = elm_read_reg(info, ELM_LOCATION_CONFIG);  in elm_context_save()
446 	regs->elm_page_ctrl       = elm_read_reg(info, ELM_PAGE_CTRL);  in elm_context_save()
451 			regs->elm_syndrome_fragment_6[i] = elm_read_reg(info,  in elm_context_save()
453 			regs->elm_syndrome_fragment_5[i] = elm_read_reg(info,  in elm_context_save()
455 			regs->elm_syndrome_fragment_4[i] = elm_read_reg(info,  in elm_context_save()
459 			regs->elm_syndrome_fragment_3[i] = elm_read_reg(info,  in elm_context_save()
461 			regs->elm_syndrome_fragment_2[i] = elm_read_reg(info,  in elm_context_save()
465 			regs->elm_syndrome_fragment_1[i] = elm_read_reg(info,  in elm_context_save()
467 			regs->elm_syndrome_fragment_0[i] = elm_read_reg(info,  in elm_context_save()
471 			return -EINVAL;  in elm_context_save()
475 		regs->elm_syndrome_fragment_6[i] = elm_read_reg(info,  in elm_context_save()
483  * writes configurations saved duing power-down back into ELM registers
487 	struct elm_registers *regs = &info->elm_regs;  in elm_context_restore()
488 	enum bch_ecc bch_type = info->bch_type;  in elm_context_restore()
491 	elm_write_reg(info, ELM_IRQENABLE,	 regs->elm_irqenable);  in elm_context_restore()
492 	elm_write_reg(info, ELM_SYSCONFIG,	 regs->elm_sysconfig);  in elm_context_restore()
493 	elm_write_reg(info, ELM_LOCATION_CONFIG, regs->elm_location_config);  in elm_context_restore()
494 	elm_write_reg(info, ELM_PAGE_CTRL,	 regs->elm_page_ctrl);  in elm_context_restore()
500 					regs->elm_syndrome_fragment_6[i]);  in elm_context_restore()
502 					regs->elm_syndrome_fragment_5[i]);  in elm_context_restore()
504 					regs->elm_syndrome_fragment_4[i]);  in elm_context_restore()
508 					regs->elm_syndrome_fragment_3[i]);  in elm_context_restore()
510 					regs->elm_syndrome_fragment_2[i]);  in elm_context_restore()
514 					regs->elm_syndrome_fragment_1[i]);  in elm_context_restore()
516 					regs->elm_syndrome_fragment_0[i]);  in elm_context_restore()
519 			return -EINVAL;  in elm_context_restore()
523 					regs->elm_syndrome_fragment_6[i] &  in elm_context_restore()
550 	{ .compatible = "ti,am3352-elm" },
551 	{ .compatible = "ti,am64-elm" },