1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2010 - 2013 Texas Instruments Incorporated. http://www.ti.com/
8  * Murali Karicheri <m-[email protected]>
16 #include <linux/memory/ti-aemif.h>
33 #define TA(x)		((x) << TA_SHIFT)  argument
34 #define RHOLD(x)	((x) << RHOLD_SHIFT)  argument
35 #define RSTROBE(x)	((x) << RSTROBE_SHIFT)  argument
36 #define RSETUP(x)	((x) << RSETUP_SHIFT)  argument
37 #define WHOLD(x)	((x) << WHOLD_SHIFT)  argument
38 #define WSTROBE(x)	((x) << WSTROBE_SHIFT)  argument
39 #define WSETUP(x)	((x) << WSETUP_SHIFT)  argument
40 #define EW(x)		((x) << EW_SHIFT)  argument
41 #define SSTROBE(x)	((x) << SSTROBE_SHIFT)  argument
55 #define TA_VAL(x)	(((x) & TA(TA_MAX)) >> TA_SHIFT)  argument
56 #define RHOLD_VAL(x)	(((x) & RHOLD(RHOLD_MAX)) >> RHOLD_SHIFT)  argument
57 #define RSTROBE_VAL(x)	(((x) & RSTROBE(RSTROBE_MAX)) >> RSTROBE_SHIFT)  argument
58 #define RSETUP_VAL(x)	(((x) & RSETUP(RSETUP_MAX)) >> RSETUP_SHIFT)  argument
59 #define WHOLD_VAL(x)	(((x) & WHOLD(WHOLD_MAX)) >> WHOLD_SHIFT)  argument
60 #define WSTROBE_VAL(x)	(((x) & WSTROBE(WSTROBE_MAX)) >> WSTROBE_SHIFT)  argument
61 #define WSETUP_VAL(x)	(((x) & WSETUP(WSETUP_MAX)) >> WSETUP_SHIFT)  argument
62 #define EW_VAL(x)	(((x) & EW(EW_MAX)) >> EW_SHIFT)  argument
63 #define SSTROBE_VAL(x)	(((x) & SSTROBE(SSTROBE_MAX)) >> SSTROBE_SHIFT)  argument
85  * struct aemif_cs_data: structure to hold CS parameters
87  * @cs: chip-select number
94 	u8	cs;  member
105  * @num_cs: number of assigned chip-selects
106  * @cs_offset: start number of cs nodes
107  * @cs_data: array of chip-select settings
108  * @config_cs_lock: lock used to access CS configuration
121  * aemif_check_cs_timings() - Check the validity of a CS timing configuration.
128 	if (timings->ta > TA_MAX)  in aemif_check_cs_timings()
129 		return -EINVAL;  in aemif_check_cs_timings()
131 	if (timings->rhold > RHOLD_MAX)  in aemif_check_cs_timings()
132 		return -EINVAL;  in aemif_check_cs_timings()
134 	if (timings->rstrobe > RSTROBE_MAX)  in aemif_check_cs_timings()
135 		return -EINVAL;  in aemif_check_cs_timings()
137 	if (timings->rsetup > RSETUP_MAX)  in aemif_check_cs_timings()
138 		return -EINVAL;  in aemif_check_cs_timings()
140 	if (timings->whold > WHOLD_MAX)  in aemif_check_cs_timings()
141 		return -EINVAL;  in aemif_check_cs_timings()
143 	if (timings->wstrobe > WSTROBE_MAX)  in aemif_check_cs_timings()
144 		return -EINVAL;  in aemif_check_cs_timings()
146 	if (timings->wsetup > WSETUP_MAX)  in aemif_check_cs_timings()
147 		return -EINVAL;  in aemif_check_cs_timings()
154  * aemif_set_cs_timings() - Set the timing configuration of a given chip select.
156  * @cs: index of the chip select to configure
161 int aemif_set_cs_timings(struct aemif_device *aemif, u8 cs,  in aemif_set_cs_timings()  argument
169 		return -EINVAL;  in aemif_set_cs_timings()
171 	if (cs > aemif->num_cs)  in aemif_set_cs_timings()
172 		return -EINVAL;  in aemif_set_cs_timings()
178 	set = TA(timings->ta) | RHOLD(timings->rhold) | RSTROBE(timings->rstrobe) |  in aemif_set_cs_timings()
179 	      RSETUP(timings->rsetup) | WHOLD(timings->whold) |  in aemif_set_cs_timings()
180 	      WSTROBE(timings->wstrobe) | WSETUP(timings->wsetup);  in aemif_set_cs_timings()
182 	offset = A1CR_OFFSET + cs * 4;  in aemif_set_cs_timings()
184 	mutex_lock(&aemif->config_cs_lock);  in aemif_set_cs_timings()
185 	val = readl(aemif->base + offset);  in aemif_set_cs_timings()
188 	writel(val, aemif->base + offset);  in aemif_set_cs_timings()
189 	mutex_unlock(&aemif->config_cs_lock);  in aemif_set_cs_timings()
196  * aemif_calc_rate - calculate timing data.
208 	result = DIV_ROUND_UP((wanted * clk), NSEC_PER_MSEC) - 1;  in aemif_calc_rate()
210 	dev_dbg(&pdev->dev, "%s: result %d from %ld, %d\n", __func__, result,  in aemif_calc_rate()
221  * aemif_config_abus - configure async bus parameters
230  * chip-select.
237 	struct aemif_cs_data *data = &aemif->cs_data[csnum];  in aemif_config_abus()
241 	offset = A1CR_OFFSET + (data->cs - aemif->cs_offset) * 4;  in aemif_config_abus()
243 	set = (data->asize & ACR_ASIZE_MASK);  in aemif_config_abus()
244 	if (data->enable_ew)  in aemif_config_abus()
246 	if (data->enable_ss)  in aemif_config_abus()
249 	mutex_lock(&aemif->config_cs_lock);  in aemif_config_abus()
250 	val = readl(aemif->base + offset);  in aemif_config_abus()
253 	writel(val, aemif->base + offset);  in aemif_config_abus()
254 	mutex_unlock(&aemif->config_cs_lock);  in aemif_config_abus()
256 	return aemif_set_cs_timings(aemif, data->cs - aemif->cs_offset, &data->timings);  in aemif_config_abus()
260  * aemif_get_hw_params - function to read hw register values
271 	struct aemif_cs_data *data = &aemif->cs_data[csnum];  in aemif_get_hw_params()
274 	offset = A1CR_OFFSET + (data->cs - aemif->cs_offset) * 4;  in aemif_get_hw_params()
275 	val = readl(aemif->base + offset);  in aemif_get_hw_params()
277 	data->timings.ta = TA_VAL(val);  in aemif_get_hw_params()
278 	data->timings.rhold = RHOLD_VAL(val);  in aemif_get_hw_params()
279 	data->timings.rstrobe = RSTROBE_VAL(val);  in aemif_get_hw_params()
280 	data->timings.rsetup = RSETUP_VAL(val);  in aemif_get_hw_params()
281 	data->timings.whold = WHOLD_VAL(val);  in aemif_get_hw_params()
282 	data->timings.wstrobe = WSTROBE_VAL(val);  in aemif_get_hw_params()
283 	data->timings.wsetup = WSETUP_VAL(val);  in aemif_get_hw_params()
284 	data->enable_ew = EW_VAL(val);  in aemif_get_hw_params()
285 	data->enable_ss = SSTROBE_VAL(val);  in aemif_get_hw_params()
286 	data->asize = val & ASIZE_MAX;  in aemif_get_hw_params()
290  * of_aemif_parse_abus_config - parse CS configuration from DT
295  * configured in a cs device binding node.
301 	unsigned long clk_rate = aemif->clk_rate;  in of_aemif_parse_abus_config()
303 	u32 cs;  in of_aemif_parse_abus_config()  local
306 	if (of_property_read_u32(np, "ti,cs-chipselect", &cs)) {  in of_aemif_parse_abus_config()
307 		dev_dbg(&pdev->dev, "cs property is required");  in of_aemif_parse_abus_config()
308 		return -EINVAL;  in of_aemif_parse_abus_config()
311 	if (cs - aemif->cs_offset >= NUM_CS || cs < aemif->cs_offset) {  in of_aemif_parse_abus_config()
312 		dev_dbg(&pdev->dev, "cs number is incorrect %d", cs);  in of_aemif_parse_abus_config()
313 		return -EINVAL;  in of_aemif_parse_abus_config()
316 	if (aemif->num_cs >= NUM_CS) {  in of_aemif_parse_abus_config()
317 		dev_dbg(&pdev->dev, "cs count is more than %d", NUM_CS);  in of_aemif_parse_abus_config()
318 		return -EINVAL;  in of_aemif_parse_abus_config()
321 	data = &aemif->cs_data[aemif->num_cs];  in of_aemif_parse_abus_config()
322 	data->cs = cs;  in of_aemif_parse_abus_config()
325 	aemif_get_hw_params(pdev, aemif->num_cs++);  in of_aemif_parse_abus_config()
328 	if (!of_property_read_u32(np, "ti,cs-min-turnaround-ns", &val))  in of_aemif_parse_abus_config()
329 		data->timings.ta = aemif_calc_rate(pdev, val, clk_rate);  in of_aemif_parse_abus_config()
331 	if (!of_property_read_u32(np, "ti,cs-read-hold-ns", &val))  in of_aemif_parse_abus_config()
332 		data->timings.rhold = aemif_calc_rate(pdev, val, clk_rate);  in of_aemif_parse_abus_config()
334 	if (!of_property_read_u32(np, "ti,cs-read-strobe-ns", &val))  in of_aemif_parse_abus_config()
335 		data->timings.rstrobe = aemif_calc_rate(pdev, val, clk_rate);  in of_aemif_parse_abus_config()
337 	if (!of_property_read_u32(np, "ti,cs-read-setup-ns", &val))  in of_aemif_parse_abus_config()
338 		data->timings.rsetup = aemif_calc_rate(pdev, val, clk_rate);  in of_aemif_parse_abus_config()
340 	if (!of_property_read_u32(np, "ti,cs-write-hold-ns", &val))  in of_aemif_parse_abus_config()
341 		data->timings.whold = aemif_calc_rate(pdev, val, clk_rate);  in of_aemif_parse_abus_config()
343 	if (!of_property_read_u32(np, "ti,cs-write-strobe-ns", &val))  in of_aemif_parse_abus_config()
344 		data->timings.wstrobe = aemif_calc_rate(pdev, val, clk_rate);  in of_aemif_parse_abus_config()
346 	if (!of_property_read_u32(np, "ti,cs-write-setup-ns", &val))  in of_aemif_parse_abus_config()
347 		data->timings.wsetup = aemif_calc_rate(pdev, val, clk_rate);  in of_aemif_parse_abus_config()
349 	if (!of_property_read_u32(np, "ti,cs-bus-width", &val))  in of_aemif_parse_abus_config()
351 			data->asize = 1;  in of_aemif_parse_abus_config()
352 	data->enable_ew = of_property_read_bool(np, "ti,cs-extended-wait-mode");  in of_aemif_parse_abus_config()
353 	data->enable_ss = of_property_read_bool(np, "ti,cs-select-strobe-mode");  in of_aemif_parse_abus_config()
355 	return aemif_check_cs_timings(&data->timings);  in of_aemif_parse_abus_config()
359 	{ .compatible = "ti,davinci-aemif", },
360 	{ .compatible = "ti,da850-aemif", },
368 	int ret = -ENODEV;  in aemif_probe()
369 	struct device *dev = &pdev->dev;  in aemif_probe()
370 	struct device_node *np = dev->of_node;  in aemif_probe()
375 		return -ENOMEM;  in aemif_probe()
379 	aemif->clk = devm_clk_get_enabled(dev, NULL);  in aemif_probe()
380 	if (IS_ERR(aemif->clk))  in aemif_probe()
381 		return dev_err_probe(dev, PTR_ERR(aemif->clk),  in aemif_probe()
384 	aemif->clk_rate = clk_get_rate(aemif->clk) / MSEC_PER_SEC;  in aemif_probe()
386 	if (np && of_device_is_compatible(np, "ti,da850-aemif"))  in aemif_probe()
387 		aemif->cs_offset = 2;  in aemif_probe()
389 	aemif->base = devm_platform_ioremap_resource(pdev, 0);  in aemif_probe()
390 	if (IS_ERR(aemif->base))  in aemif_probe()
391 		return PTR_ERR(aemif->base);  in aemif_probe()
393 	mutex_init(&aemif->config_cs_lock);  in aemif_probe()
396 		 * For every controller device node, there is a cs device node  in aemif_probe()
398 		 * functions iterate over these nodes and update the cs data  in aemif_probe()
408 	for (i = 0; i < aemif->num_cs; i++) {  in aemif_probe()
412 				aemif->cs_data[i].cs);  in aemif_probe()
435 		.name = "ti-aemif",
442 MODULE_AUTHOR("Murali Karicheri <m-[email protected]>");