1 // SPDX-License-Identifier: GPL-2.0-only
6  * Author: Alex Smith <alex@alex-smith.me.uk>
20 #include <linux/jz4780-nemc.h>
22 #define NEMC_SMCRn(n)		(0x14 + (((n) - 1) * 4))
42 #define NEMC_NFCSR_NFEn(n)	BIT(((n) - 1) << 1)
43 #define NEMC_NFCSR_NFCEn(n)	BIT((((n) - 1) << 1) + 1)
44 #define NEMC_NFCSR_TNFEn(n)	BIT(16 + (n) - 1)
61  * jz4780_nemc_num_banks() - count the number of banks referenced by a device
64  * Return: The number of unique NEMC banks referred to by the specified NEMC
65  * child device. Unique here means that a device that references the same bank
71 	unsigned int bank, count = 0;  in jz4780_nemc_num_banks()  local
75 	while ((prop = of_get_address(dev->of_node, i++, NULL, NULL))) {  in jz4780_nemc_num_banks()
76 		bank = of_read_number(prop, 1);  in jz4780_nemc_num_banks()
77 		if (!(referenced & BIT(bank))) {  in jz4780_nemc_num_banks()
78 			referenced |= BIT(bank);  in jz4780_nemc_num_banks()
88  * jz4780_nemc_set_type() - set the type of device connected to a bank
90  * @bank: bank number to configure.
91  * @type: type of device connected to the bank.
93 void jz4780_nemc_set_type(struct device *dev, unsigned int bank,  in jz4780_nemc_set_type()  argument
96 	struct jz4780_nemc *nemc = dev_get_drvdata(dev->parent);  in jz4780_nemc_set_type()
99 	nfcsr = readl(nemc->base + NEMC_NFCSR);  in jz4780_nemc_set_type()
104 		nfcsr &= ~(NEMC_NFCSR_TNFEn(bank) | NEMC_NFCSR_NFEn(bank));  in jz4780_nemc_set_type()
107 		nfcsr &= ~NEMC_NFCSR_TNFEn(bank);  in jz4780_nemc_set_type()
108 		nfcsr |= NEMC_NFCSR_NFEn(bank);  in jz4780_nemc_set_type()
112 	writel(nfcsr, nemc->base + NEMC_NFCSR);  in jz4780_nemc_set_type()
117  * jz4780_nemc_assert() - (de-)assert a NAND device's chip enable pin
119  * @bank: bank number of device.
122  * (De-)asserts the chip enable pin for the NAND device connected to the
123  * specified bank.
125 void jz4780_nemc_assert(struct device *dev, unsigned int bank, bool assert)  in jz4780_nemc_assert()  argument
127 	struct jz4780_nemc *nemc = dev_get_drvdata(dev->parent);  in jz4780_nemc_assert()
130 	nfcsr = readl(nemc->base + NEMC_NFCSR);  in jz4780_nemc_assert()
133 		nfcsr |= NEMC_NFCSR_NFCEn(bank);  in jz4780_nemc_assert()
135 		nfcsr &= ~NEMC_NFCSR_NFCEn(bank);  in jz4780_nemc_assert()
137 	writel(nfcsr, nemc->base + NEMC_NFCSR);  in jz4780_nemc_assert()
145 	rate = clk_get_rate(nemc->clk);  in jz4780_nemc_clk_period()
155 	return ((ns * 1000) + nemc->clk_period - 1) / nemc->clk_period;  in jz4780_nemc_ns_to_cycles()
159 				       unsigned int bank,  in jz4780_nemc_configure_bank()  argument
171 		/* 11 - 12 -> 12 cycles */  in jz4780_nemc_configure_bank()
174 		/* 13 - 15 -> 15 cycles */  in jz4780_nemc_configure_bank()
177 		/* 16 - 20 -> 20 cycles */  in jz4780_nemc_configure_bank()
180 		/* 21 - 25 -> 25 cycles */  in jz4780_nemc_configure_bank()
183 		/* 26 - 31 -> 31 cycles */  in jz4780_nemc_configure_bank()
187 	smcr = readl(nemc->base + NEMC_SMCRn(bank));  in jz4780_nemc_configure_bank()
190 	if (!of_property_read_u32(node, "ingenic,nemc-bus-width", &val)) {  in jz4780_nemc_configure_bank()
201 			dev_err(nemc->dev, "unsupported bus width: %u\n", val);  in jz4780_nemc_configure_bank()
206 	if (of_property_read_u32(node, "ingenic,nemc-tAS", &val) == 0) {  in jz4780_nemc_configure_bank()
209 		if (cycles > nemc->soc_info->tas_tah_cycles_max) {  in jz4780_nemc_configure_bank()
210 			dev_err(nemc->dev, "tAS %u is too high (%u cycles)\n",  in jz4780_nemc_configure_bank()
218 	if (of_property_read_u32(node, "ingenic,nemc-tAH", &val) == 0) {  in jz4780_nemc_configure_bank()
221 		if (cycles > nemc->soc_info->tas_tah_cycles_max) {  in jz4780_nemc_configure_bank()
222 			dev_err(nemc->dev, "tAH %u is too high (%u cycles)\n",  in jz4780_nemc_configure_bank()
230 	if (of_property_read_u32(node, "ingenic,nemc-tBP", &val) == 0) {  in jz4780_nemc_configure_bank()
234 			dev_err(nemc->dev, "tBP %u is too high (%u cycles)\n",  in jz4780_nemc_configure_bank()
242 	if (of_property_read_u32(node, "ingenic,nemc-tAW", &val) == 0) {  in jz4780_nemc_configure_bank()
246 			dev_err(nemc->dev, "tAW %u is too high (%u cycles)\n",  in jz4780_nemc_configure_bank()
254 	if (of_property_read_u32(node, "ingenic,nemc-tSTRV", &val) == 0) {  in jz4780_nemc_configure_bank()
258 			dev_err(nemc->dev, "tSTRV %u is too high (%u cycles)\n",  in jz4780_nemc_configure_bank()
266 	writel(smcr, nemc->base + NEMC_SMCRn(bank));  in jz4780_nemc_configure_bank()
272 	struct device *dev = &pdev->dev;  in jz4780_nemc_probe()
277 	unsigned int bank;  in jz4780_nemc_probe()  local
283 		return -ENOMEM;  in jz4780_nemc_probe()
285 	nemc->soc_info = device_get_match_data(dev);  in jz4780_nemc_probe()
286 	if (!nemc->soc_info)  in jz4780_nemc_probe()
287 		return -EINVAL;  in jz4780_nemc_probe()
289 	spin_lock_init(&nemc->lock);  in jz4780_nemc_probe()
290 	nemc->dev = dev;  in jz4780_nemc_probe()
294 		return -EINVAL;  in jz4780_nemc_probe()
302 	if (!devm_request_mem_region(dev, res->start, NEMC_REG_LEN, dev_name(dev))) {  in jz4780_nemc_probe()
304 		return -EBUSY;  in jz4780_nemc_probe()
307 	nemc->base = devm_ioremap(dev, res->start, NEMC_REG_LEN);  in jz4780_nemc_probe()
308 	if (!nemc->base) {  in jz4780_nemc_probe()
310 		return -ENOMEM;  in jz4780_nemc_probe()
313 	writel(0, nemc->base + NEMC_NFCSR);  in jz4780_nemc_probe()
315 	nemc->clk = devm_clk_get(dev, NULL);  in jz4780_nemc_probe()
316 	if (IS_ERR(nemc->clk)) {  in jz4780_nemc_probe()
318 		return PTR_ERR(nemc->clk);  in jz4780_nemc_probe()
321 	ret = clk_prepare_enable(nemc->clk);  in jz4780_nemc_probe()
327 	nemc->clk_period = jz4780_nemc_clk_period(nemc);  in jz4780_nemc_probe()
328 	if (!nemc->clk_period) {  in jz4780_nemc_probe()
330 		clk_disable_unprepare(nemc->clk);  in jz4780_nemc_probe()
331 		return -EINVAL;  in jz4780_nemc_probe()
340 	for_each_child_of_node(nemc->dev->of_node, child) {  in jz4780_nemc_probe()
344 			bank = of_read_number(prop, 1);  in jz4780_nemc_probe()
345 			if (bank < 1 || bank >= JZ4780_NEMC_NUM_BANKS) {  in jz4780_nemc_probe()
346 				dev_err(nemc->dev,  in jz4780_nemc_probe()
347 					"%pOF requests invalid bank %u\n",  in jz4780_nemc_probe()
348 					child, bank);  in jz4780_nemc_probe()
355 			referenced |= BIT(bank);  in jz4780_nemc_probe()
359 			dev_err(nemc->dev, "%pOF has no addresses\n",  in jz4780_nemc_probe()
362 		} else if (nemc->banks_present & referenced) {  in jz4780_nemc_probe()
363 			dev_err(nemc->dev, "%pOF conflicts with another node\n",  in jz4780_nemc_probe()
368 		/* Configure bank parameters. */  in jz4780_nemc_probe()
369 		for_each_set_bit(bank, &referenced, JZ4780_NEMC_NUM_BANKS) {  in jz4780_nemc_probe()
370 			if (!jz4780_nemc_configure_bank(nemc, bank, child)) {  in jz4780_nemc_probe()
377 			if (of_platform_device_create(child, NULL, nemc->dev))  in jz4780_nemc_probe()
378 				nemc->banks_present |= referenced;  in jz4780_nemc_probe()
391 	clk_disable_unprepare(nemc->clk);  in jz4780_nemc_remove()
403 	{ .compatible = "ingenic,jz4740-nemc", .data = &jz4740_soc_info, },
404 	{ .compatible = "ingenic,jz4780-nemc", .data = &jz4780_soc_info, },
412 		.name	= "jz4780-nemc",