1 // SPDX-License-Identifier: GPL-2.0
3  * JZ47xx ECC common code
18  * ingenic_ecc_calculate() - calculate ECC for a data buffer
19  * @ecc: ECC device.
20  * @params: ECC parameters.
22  * @ecc_code: output buffer with ECC.
24  * Return: 0 on success, -ETIMEDOUT if timed out while waiting for ECC
27 int ingenic_ecc_calculate(struct ingenic_ecc *ecc,  in ingenic_ecc_calculate()  argument
31 	return ecc->ops->calculate(ecc, params, buf, ecc_code);  in ingenic_ecc_calculate()
35  * ingenic_ecc_correct() - detect and correct bit errors
36  * @ecc: ECC device.
37  * @params: ECC parameters.
39  * @ecc_code: ECC read from the chip.
41  * Given the raw data and the ECC read from the NAND device, detects and
44  * Return: the number of bit errors corrected, -EBADMSG if there are too many
45  * errors to correct or -ETIMEDOUT if we timed out waiting for the controller.
47 int ingenic_ecc_correct(struct ingenic_ecc *ecc,  in ingenic_ecc_correct()  argument
51 	return ecc->ops->correct(ecc, params, buf, ecc_code);  in ingenic_ecc_correct()
55  * ingenic_ecc_get() - get the ECC controller device
56  * @np: ECC device tree node.
58  * Gets the ECC controller device from the specified device tree node. The
63  * PTR_ERR(-EPROBE_DEFER) if the device hasn't been initialised yet.
68 	struct ingenic_ecc *ecc;  in ingenic_ecc_get()  local
72 		return ERR_PTR(-EPROBE_DEFER);  in ingenic_ecc_get()
74 	get_device(&pdev->dev);  in ingenic_ecc_get()
76 	ecc = platform_get_drvdata(pdev);  in ingenic_ecc_get()
77 	clk_prepare_enable(ecc->clk);  in ingenic_ecc_get()
79 	return ecc;  in ingenic_ecc_get()
83  * of_ingenic_ecc_get() - get the ECC controller from a DT node
84  * @of_node: the node that contains an ecc-engine property.
86  * Get the ecc-engine property from the given device tree
90  * PTR_ERR(-EPROBE_DEFER) if the device hasn't been initialised yet.
94 	struct ingenic_ecc *ecc = NULL;  in of_ingenic_ecc_get()  local
97 	np = of_parse_phandle(of_node, "ecc-engine", 0);  in of_ingenic_ecc_get()
100 	 * If the ecc-engine property is not found, check for the deprecated  in of_ingenic_ecc_get()
101 	 * ingenic,bch-controller property  in of_ingenic_ecc_get()
104 		np = of_parse_phandle(of_node, "ingenic,bch-controller", 0);  in of_ingenic_ecc_get()
107 		ecc = ingenic_ecc_get(np);  in of_ingenic_ecc_get()
110 	return ecc;  in of_ingenic_ecc_get()
114  * ingenic_ecc_release() - release the ECC controller device
115  * @ecc: ECC device.
117 void ingenic_ecc_release(struct ingenic_ecc *ecc)  in ingenic_ecc_release()  argument
119 	clk_disable_unprepare(ecc->clk);  in ingenic_ecc_release()
120 	put_device(ecc->dev);  in ingenic_ecc_release()
125 	struct device *dev = &pdev->dev;  in ingenic_ecc_probe()
126 	struct ingenic_ecc *ecc;  in ingenic_ecc_probe()  local
128 	ecc = devm_kzalloc(dev, sizeof(*ecc), GFP_KERNEL);  in ingenic_ecc_probe()
129 	if (!ecc)  in ingenic_ecc_probe()
130 		return -ENOMEM;  in ingenic_ecc_probe()
132 	ecc->ops = device_get_match_data(dev);  in ingenic_ecc_probe()
133 	if (!ecc->ops)  in ingenic_ecc_probe()
134 		return -EINVAL;  in ingenic_ecc_probe()
136 	ecc->base = devm_platform_ioremap_resource(pdev, 0);  in ingenic_ecc_probe()
137 	if (IS_ERR(ecc->base))  in ingenic_ecc_probe()
138 		return PTR_ERR(ecc->base);  in ingenic_ecc_probe()
140 	ecc->ops->disable(ecc);  in ingenic_ecc_probe()
142 	ecc->clk = devm_clk_get(dev, NULL);  in ingenic_ecc_probe()
143 	if (IS_ERR(ecc->clk)) {  in ingenic_ecc_probe()
144 		dev_err(dev, "failed to get clock: %ld\n", PTR_ERR(ecc->clk));  in ingenic_ecc_probe()
145 		return PTR_ERR(ecc->clk);  in ingenic_ecc_probe()
148 	mutex_init(&ecc->lock);  in ingenic_ecc_probe()
150 	ecc->dev = dev;  in ingenic_ecc_probe()
151 	platform_set_drvdata(pdev, ecc);  in ingenic_ecc_probe()