1 // SPDX-License-Identifier: GPL-2.0
3  * JZ47xx ECC common code
19  * ingenic_ecc_calculate() - calculate ECC for a data buffer
20  * @ecc: ECC device.
21  * @params: ECC parameters.
23  * @ecc_code: output buffer with ECC.
25  * Return: 0 on success, -ETIMEDOUT if timed out while waiting for ECC
28 int ingenic_ecc_calculate(struct ingenic_ecc *ecc,  in ingenic_ecc_calculate()  argument
32 	return ecc->ops->calculate(ecc, params, buf, ecc_code);  in ingenic_ecc_calculate()
36  * ingenic_ecc_correct() - detect and correct bit errors
37  * @ecc: ECC device.
38  * @params: ECC parameters.
40  * @ecc_code: ECC read from the chip.
42  * Given the raw data and the ECC read from the NAND device, detects and
45  * Return: the number of bit errors corrected, -EBADMSG if there are too many
46  * errors to correct or -ETIMEDOUT if we timed out waiting for the controller.
48 int ingenic_ecc_correct(struct ingenic_ecc *ecc,  in ingenic_ecc_correct()  argument
52 	return ecc->ops->correct(ecc, params, buf, ecc_code);  in ingenic_ecc_correct()
56  * ingenic_ecc_get() - get the ECC controller device
57  * @np: ECC device tree node.
59  * Gets the ECC controller device from the specified device tree node. The
64  * PTR_ERR(-EPROBE_DEFER) if the device hasn't been initialised yet.
69 	struct ingenic_ecc *ecc;  in ingenic_ecc_get()  local
73 		return ERR_PTR(-EPROBE_DEFER);  in ingenic_ecc_get()
76 		put_device(&pdev->dev);  in ingenic_ecc_get()
77 		return ERR_PTR(-EPROBE_DEFER);  in ingenic_ecc_get()
80 	ecc = platform_get_drvdata(pdev);  in ingenic_ecc_get()
81 	clk_prepare_enable(ecc->clk);  in ingenic_ecc_get()
83 	return ecc;  in ingenic_ecc_get()
87  * of_ingenic_ecc_get() - get the ECC controller from a DT node
88  * @of_node: the node that contains an ecc-engine property.
90  * Get the ecc-engine property from the given device tree
94  * PTR_ERR(-EPROBE_DEFER) if the device hasn't been initialised yet.
98 	struct ingenic_ecc *ecc = NULL;  in of_ingenic_ecc_get()  local
101 	np = of_parse_phandle(of_node, "ecc-engine", 0);  in of_ingenic_ecc_get()
104 	 * If the ecc-engine property is not found, check for the deprecated  in of_ingenic_ecc_get()
105 	 * ingenic,bch-controller property  in of_ingenic_ecc_get()
108 		np = of_parse_phandle(of_node, "ingenic,bch-controller", 0);  in of_ingenic_ecc_get()
111 		ecc = ingenic_ecc_get(np);  in of_ingenic_ecc_get()
114 	return ecc;  in of_ingenic_ecc_get()
118  * ingenic_ecc_release() - release the ECC controller device
119  * @ecc: ECC device.
121 void ingenic_ecc_release(struct ingenic_ecc *ecc)  in ingenic_ecc_release()  argument
123 	clk_disable_unprepare(ecc->clk);  in ingenic_ecc_release()
124 	put_device(ecc->dev);  in ingenic_ecc_release()
129 	struct device *dev = &pdev->dev;  in ingenic_ecc_probe()
130 	struct ingenic_ecc *ecc;  in ingenic_ecc_probe()  local
132 	ecc = devm_kzalloc(dev, sizeof(*ecc), GFP_KERNEL);  in ingenic_ecc_probe()
133 	if (!ecc)  in ingenic_ecc_probe()
134 		return -ENOMEM;  in ingenic_ecc_probe()
136 	ecc->ops = device_get_match_data(dev);  in ingenic_ecc_probe()
137 	if (!ecc->ops)  in ingenic_ecc_probe()
138 		return -EINVAL;  in ingenic_ecc_probe()
140 	ecc->base = devm_platform_ioremap_resource(pdev, 0);  in ingenic_ecc_probe()
141 	if (IS_ERR(ecc->base))  in ingenic_ecc_probe()
142 		return PTR_ERR(ecc->base);  in ingenic_ecc_probe()
144 	ecc->ops->disable(ecc);  in ingenic_ecc_probe()
146 	ecc->clk = devm_clk_get(dev, NULL);  in ingenic_ecc_probe()
147 	if (IS_ERR(ecc->clk)) {  in ingenic_ecc_probe()
148 		dev_err(dev, "failed to get clock: %ld\n", PTR_ERR(ecc->clk));  in ingenic_ecc_probe()
149 		return PTR_ERR(ecc->clk);  in ingenic_ecc_probe()
152 	mutex_init(&ecc->lock);  in ingenic_ecc_probe()
154 	ecc->dev = dev;  in ingenic_ecc_probe()
155 	platform_set_drvdata(pdev, ecc);  in ingenic_ecc_probe()