1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2010 - 2013 Texas Instruments Incorporated. http://www.ti.com/
8  * Murali Karicheri <m-karicheri2@ti.com>
83  * struct aemif_cs_data: structure to hold cs parameters
84  * @cs: chip-select number
97 	u8	cs;  member
115  * @num_cs: number of assigned chip-selects
116  * @cs_offset: start number of cs nodes
117  * @cs_data: array of chip-select settings
129  * aemif_calc_rate - calculate timing data.
143 	result = DIV_ROUND_UP((wanted * clk), NSEC_PER_MSEC) - 1;  in aemif_calc_rate()
145 	dev_dbg(&pdev->dev, "%s: result %d from %ld, %d\n", __func__, result,  in aemif_calc_rate()
154 		result = -EINVAL;  in aemif_calc_rate()
160  * aemif_config_abus - configure async bus parameters
162  * @csnum: aemif chip select number
169  * chip-select.
176 	struct aemif_cs_data *data = &aemif->cs_data[csnum];  in aemif_config_abus()
178 	unsigned long clk_rate = aemif->clk_rate;  in aemif_config_abus()
182 	offset = A1CR_OFFSET + (data->cs - aemif->cs_offset) * 4;  in aemif_config_abus()
184 	ta	= aemif_calc_rate(pdev, data->ta, clk_rate, TA_MAX);  in aemif_config_abus()
185 	rhold	= aemif_calc_rate(pdev, data->rhold, clk_rate, RHOLD_MAX);  in aemif_config_abus()
186 	rstrobe	= aemif_calc_rate(pdev, data->rstrobe, clk_rate, RSTROBE_MAX);  in aemif_config_abus()
187 	rsetup	= aemif_calc_rate(pdev, data->rsetup, clk_rate, RSETUP_MAX);  in aemif_config_abus()
188 	whold	= aemif_calc_rate(pdev, data->whold, clk_rate, WHOLD_MAX);  in aemif_config_abus()
189 	wstrobe	= aemif_calc_rate(pdev, data->wstrobe, clk_rate, WSTROBE_MAX);  in aemif_config_abus()
190 	wsetup	= aemif_calc_rate(pdev, data->wsetup, clk_rate, WSETUP_MAX);  in aemif_config_abus()
194 		dev_err(&pdev->dev, "%s: cannot get suitable timings\n",  in aemif_config_abus()
196 		return -EINVAL;  in aemif_config_abus()
202 	set |= (data->asize & ACR_ASIZE_MASK);  in aemif_config_abus()
203 	if (data->enable_ew)  in aemif_config_abus()
205 	if (data->enable_ss)  in aemif_config_abus()
208 	val = readl(aemif->base + offset);  in aemif_config_abus()
211 	writel(val, aemif->base + offset);  in aemif_config_abus()
222  * aemif_get_hw_params - function to read hw register values
224  * @csnum: aemif chip select number
233 	struct aemif_cs_data *data = &aemif->cs_data[csnum];  in aemif_get_hw_params()
234 	unsigned long clk_rate = aemif->clk_rate;  in aemif_get_hw_params()
237 	offset = A1CR_OFFSET + (data->cs - aemif->cs_offset) * 4;  in aemif_get_hw_params()
238 	val = readl(aemif->base + offset);  in aemif_get_hw_params()
240 	data->ta = aemif_cycles_to_nsec(TA_VAL(val), clk_rate);  in aemif_get_hw_params()
241 	data->rhold = aemif_cycles_to_nsec(RHOLD_VAL(val), clk_rate);  in aemif_get_hw_params()
242 	data->rstrobe = aemif_cycles_to_nsec(RSTROBE_VAL(val), clk_rate);  in aemif_get_hw_params()
243 	data->rsetup = aemif_cycles_to_nsec(RSETUP_VAL(val), clk_rate);  in aemif_get_hw_params()
244 	data->whold = aemif_cycles_to_nsec(WHOLD_VAL(val), clk_rate);  in aemif_get_hw_params()
245 	data->wstrobe = aemif_cycles_to_nsec(WSTROBE_VAL(val), clk_rate);  in aemif_get_hw_params()
246 	data->wsetup = aemif_cycles_to_nsec(WSETUP_VAL(val), clk_rate);  in aemif_get_hw_params()
247 	data->enable_ew = EW_VAL(val);  in aemif_get_hw_params()
248 	data->enable_ss = SSTROBE_VAL(val);  in aemif_get_hw_params()
249 	data->asize = val & ASIZE_MAX;  in aemif_get_hw_params()
253  * of_aemif_parse_abus_config - parse CS configuration from DT
258  * configured in a cs device binding node.
265 	u32 cs;  in of_aemif_parse_abus_config()  local
268 	if (of_property_read_u32(np, "ti,cs-chipselect", &cs)) {  in of_aemif_parse_abus_config()
269 		dev_dbg(&pdev->dev, "cs property is required");  in of_aemif_parse_abus_config()
270 		return -EINVAL;  in of_aemif_parse_abus_config()
273 	if (cs - aemif->cs_offset >= NUM_CS || cs < aemif->cs_offset) {  in of_aemif_parse_abus_config()
274 		dev_dbg(&pdev->dev, "cs number is incorrect %d", cs);  in of_aemif_parse_abus_config()
275 		return -EINVAL;  in of_aemif_parse_abus_config()
278 	if (aemif->num_cs >= NUM_CS) {  in of_aemif_parse_abus_config()
279 		dev_dbg(&pdev->dev, "cs count is more than %d", NUM_CS);  in of_aemif_parse_abus_config()
280 		return -EINVAL;  in of_aemif_parse_abus_config()
283 	data = &aemif->cs_data[aemif->num_cs];  in of_aemif_parse_abus_config()
284 	data->cs = cs;  in of_aemif_parse_abus_config()
287 	aemif_get_hw_params(pdev, aemif->num_cs++);  in of_aemif_parse_abus_config()
290 	if (!of_property_read_u32(np, "ti,cs-min-turnaround-ns", &val))  in of_aemif_parse_abus_config()
291 		data->ta = val;  in of_aemif_parse_abus_config()
293 	if (!of_property_read_u32(np, "ti,cs-read-hold-ns", &val))  in of_aemif_parse_abus_config()
294 		data->rhold = val;  in of_aemif_parse_abus_config()
296 	if (!of_property_read_u32(np, "ti,cs-read-strobe-ns", &val))  in of_aemif_parse_abus_config()
297 		data->rstrobe = val;  in of_aemif_parse_abus_config()
299 	if (!of_property_read_u32(np, "ti,cs-read-setup-ns", &val))  in of_aemif_parse_abus_config()
300 		data->rsetup = val;  in of_aemif_parse_abus_config()
302 	if (!of_property_read_u32(np, "ti,cs-write-hold-ns", &val))  in of_aemif_parse_abus_config()
303 		data->whold = val;  in of_aemif_parse_abus_config()
305 	if (!of_property_read_u32(np, "ti,cs-write-strobe-ns", &val))  in of_aemif_parse_abus_config()
306 		data->wstrobe = val;  in of_aemif_parse_abus_config()
308 	if (!of_property_read_u32(np, "ti,cs-write-setup-ns", &val))  in of_aemif_parse_abus_config()
309 		data->wsetup = val;  in of_aemif_parse_abus_config()
311 	if (!of_property_read_u32(np, "ti,cs-bus-width", &val))  in of_aemif_parse_abus_config()
313 			data->asize = 1;  in of_aemif_parse_abus_config()
314 	data->enable_ew = of_property_read_bool(np, "ti,cs-extended-wait-mode");  in of_aemif_parse_abus_config()
315 	data->enable_ss = of_property_read_bool(np, "ti,cs-select-strobe-mode");  in of_aemif_parse_abus_config()
320 	{ .compatible = "ti,davinci-aemif", },
321 	{ .compatible = "ti,da850-aemif", },
329 	int ret = -ENODEV;  in aemif_probe()
330 	struct device *dev = &pdev->dev;  in aemif_probe()
331 	struct device_node *np = dev->of_node;  in aemif_probe()
336 		return -ENOMEM;  in aemif_probe()
340 	aemif->clk = devm_clk_get_enabled(dev, NULL);  in aemif_probe()
341 	if (IS_ERR(aemif->clk))  in aemif_probe()
342 		return dev_err_probe(dev, PTR_ERR(aemif->clk),  in aemif_probe()
345 	aemif->clk_rate = clk_get_rate(aemif->clk) / MSEC_PER_SEC;  in aemif_probe()
347 	if (np && of_device_is_compatible(np, "ti,da850-aemif"))  in aemif_probe()
348 		aemif->cs_offset = 2;  in aemif_probe()
350 	aemif->base = devm_platform_ioremap_resource(pdev, 0);  in aemif_probe()
351 	if (IS_ERR(aemif->base))  in aemif_probe()
352 		return PTR_ERR(aemif->base);  in aemif_probe()
356 		 * For every controller device node, there is a cs device node  in aemif_probe()
358 		 * functions iterate over these nodes and update the cs data  in aemif_probe()
368 	for (i = 0; i < aemif->num_cs; i++) {  in aemif_probe()
372 				aemif->cs_data[i].cs);  in aemif_probe()
395 		.name = "ti-aemif",
402 MODULE_AUTHOR("Murali Karicheri <m-karicheri2@ti.com>");