1 // SPDX-License-Identifier: GPL-1.0+
5 //	Ben Dooks <ben@simtec.co.uk>, <ben-linux@fluff.org>
7 // Samsung ADC device core
22 #include "regs-adc.h"
23 #include <linux/soc/samsung/s3c-adc.h>
25 /* This driver is designed to control the usage of the ADC block between
81 #define adc_dbg(_adc, msg...) dev_dbg(&(_adc)->pdev->dev, msg)
83 static inline void s3c_adc_convert(struct adc_device *adc)  in s3c_adc_convert()  argument
85 	unsigned con = readl(adc->regs + S3C2410_ADCCON);  in s3c_adc_convert()
88 	writel(con, adc->regs + S3C2410_ADCCON);  in s3c_adc_convert()
91 static inline void s3c_adc_select(struct adc_device *adc,  in s3c_adc_select()  argument
94 	unsigned con = readl(adc->regs + S3C2410_ADCCON);  in s3c_adc_select()
95 	enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;  in s3c_adc_select()
97 	client->select_cb(client, 1);  in s3c_adc_select()
104 	if (!client->is_ts) {  in s3c_adc_select()
106 			writel(client->channel & 0xf, adc->regs + S5P_ADCMUX);  in s3c_adc_select()
108 			writel(client->channel & 0xf,  in s3c_adc_select()
109 						adc->regs + S3C2443_ADCMUX);  in s3c_adc_select()
111 			con |= S3C2410_ADCCON_SELMUX(client->channel);  in s3c_adc_select()
114 	writel(con, adc->regs + S3C2410_ADCCON);  in s3c_adc_select()
117 static void s3c_adc_dbgshow(struct adc_device *adc)  in s3c_adc_dbgshow()  argument
119 	adc_dbg(adc, "CON=%08x, TSC=%08x, DLY=%08x\n",  in s3c_adc_dbgshow()
120 		readl(adc->regs + S3C2410_ADCCON),  in s3c_adc_dbgshow()
121 		readl(adc->regs + S3C2410_ADCTSC),  in s3c_adc_dbgshow()
122 		readl(adc->regs + S3C2410_ADCDLY));  in s3c_adc_dbgshow()
125 static void s3c_adc_try(struct adc_device *adc)  in s3c_adc_try()  argument
127 	struct s3c_adc_client *next = adc->ts_pend;  in s3c_adc_try()
132 		list_del(&next->pend);  in s3c_adc_try()
134 		adc->ts_pend = NULL;  in s3c_adc_try()
137 		adc_dbg(adc, "new client is %p\n", next);  in s3c_adc_try()
138 		adc->cur = next;  in s3c_adc_try()
139 		s3c_adc_select(adc, next);  in s3c_adc_try()
140 		s3c_adc_convert(adc);  in s3c_adc_try()
141 		s3c_adc_dbgshow(adc);  in s3c_adc_try()
148 	struct adc_device *adc = adc_dev;  in s3c_adc_start()  local
151 	if (!adc) {  in s3c_adc_start()
152 		printk(KERN_ERR "%s: failed to find adc\n", __func__);  in s3c_adc_start()
153 		return -EINVAL;  in s3c_adc_start()
156 	spin_lock_irqsave(&adc->lock, flags);  in s3c_adc_start()
158 	if (client->is_ts && adc->ts_pend) {  in s3c_adc_start()
159 		spin_unlock_irqrestore(&adc->lock, flags);  in s3c_adc_start()
160 		return -EAGAIN;  in s3c_adc_start()
163 	client->channel = channel;  in s3c_adc_start()
164 	client->nr_samples = nr_samples;  in s3c_adc_start()
166 	if (client->is_ts)  in s3c_adc_start()
167 		adc->ts_pend = client;  in s3c_adc_start()
169 		list_add_tail(&client->pend, &adc_pending);  in s3c_adc_start()
171 	if (!adc->cur)  in s3c_adc_start()
172 		s3c_adc_try(adc);  in s3c_adc_start()
174 	spin_unlock_irqrestore(&adc->lock, flags);  in s3c_adc_start()
183 	client->result = v;  in s3c_convert_done()
184 	wake_up(client->wait);  in s3c_convert_done()
192 	client->convert_cb = s3c_convert_done;  in s3c_adc_read()
193 	client->wait = &wake;  in s3c_adc_read()
194 	client->result = -1;  in s3c_adc_read()
200 	ret = wait_event_timeout(wake, client->result >= 0, HZ / 2);  in s3c_adc_read()
201 	if (client->result < 0) {  in s3c_adc_read()
202 		ret = -ETIMEDOUT;  in s3c_adc_read()
206 	client->convert_cb = NULL;  in s3c_adc_read()
207 	return client->result;  in s3c_adc_read()
235 		return ERR_PTR(-EINVAL);  in s3c_adc_register()
239 		return ERR_PTR(-ENOMEM);  in s3c_adc_register()
241 	client->pdev = pdev;  in s3c_adc_register()
242 	client->is_ts = is_ts;  in s3c_adc_register()
243 	client->select_cb = select;  in s3c_adc_register()
244 	client->convert_cb = conv;  in s3c_adc_register()
254 	spin_lock_irqsave(&adc_dev->lock, flags);  in s3c_adc_release()
257 	if (adc_dev->cur == client)  in s3c_adc_release()
258 		adc_dev->cur = NULL;  in s3c_adc_release()
259 	if (adc_dev->ts_pend == client)  in s3c_adc_release()
260 		adc_dev->ts_pend = NULL;  in s3c_adc_release()
268 				list_del(&tmp->pend);  in s3c_adc_release()
272 	if (adc_dev->cur == NULL)  in s3c_adc_release()
275 	spin_unlock_irqrestore(&adc_dev->lock, flags);  in s3c_adc_release()
282 	struct adc_device *adc = pw;  in s3c_adc_irq()  local
283 	struct s3c_adc_client *client = adc->cur;  in s3c_adc_irq()
284 	enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;  in s3c_adc_irq()
288 		dev_warn(&adc->pdev->dev, "%s: no adc pending\n", __func__);  in s3c_adc_irq()
292 	data0 = readl(adc->regs + S3C2410_ADCDAT0);  in s3c_adc_irq()
293 	data1 = readl(adc->regs + S3C2410_ADCDAT1);  in s3c_adc_irq()
294 	adc_dbg(adc, "read %d: 0x%04x, 0x%04x\n", client->nr_samples, data0, data1);  in s3c_adc_irq()
296 	client->nr_samples--;  in s3c_adc_irq()
302 		/* S3C2416/S3C64XX/S5P ADC resolution is 12-bit */  in s3c_adc_irq()
307 	if (client->convert_cb)  in s3c_adc_irq()
308 		(client->convert_cb)(client, data0, data1, &client->nr_samples);  in s3c_adc_irq()
310 	if (client->nr_samples > 0) {  in s3c_adc_irq()
313 		client->select_cb(client, 1);  in s3c_adc_irq()
314 		s3c_adc_convert(adc);  in s3c_adc_irq()
316 		spin_lock(&adc->lock);  in s3c_adc_irq()
317 		(client->select_cb)(client, 0);  in s3c_adc_irq()
318 		adc->cur = NULL;  in s3c_adc_irq()
320 		s3c_adc_try(adc);  in s3c_adc_irq()
321 		spin_unlock(&adc->lock);  in s3c_adc_irq()
326 		/* Clear ADC interrupt */  in s3c_adc_irq()
327 		writel(0, adc->regs + S3C64XX_ADCCLRINT);  in s3c_adc_irq()
334 	struct device *dev = &pdev->dev;  in s3c_adc_probe()  local
335 	struct adc_device *adc;  in s3c_adc_probe()  local
336 	enum s3c_cpu_type cpu = platform_get_device_id(pdev)->driver_data;  in s3c_adc_probe()
340 	adc = devm_kzalloc(dev, sizeof(*adc), GFP_KERNEL);  in s3c_adc_probe()
341 	if (!adc)  in s3c_adc_probe()
342 		return -ENOMEM;  in s3c_adc_probe()
344 	spin_lock_init(&adc->lock);  in s3c_adc_probe()
346 	adc->pdev = pdev;  in s3c_adc_probe()
347 	adc->prescale = S3C2410_ADCCON_PRSCVL(49);  in s3c_adc_probe()
349 	adc->vdd = devm_regulator_get(dev, "vdd");  in s3c_adc_probe()
350 	if (IS_ERR(adc->vdd)) {  in s3c_adc_probe()
351 		dev_err(dev, "operating without regulator \"vdd\" .\n");  in s3c_adc_probe()
352 		return PTR_ERR(adc->vdd);  in s3c_adc_probe()
355 	adc->irq = platform_get_irq(pdev, 1);  in s3c_adc_probe()
356 	if (adc->irq <= 0)  in s3c_adc_probe()
357 		return -ENOENT;  in s3c_adc_probe()
359 	ret = devm_request_irq(dev, adc->irq, s3c_adc_irq, 0, dev_name(dev),  in s3c_adc_probe()
360 				adc);  in s3c_adc_probe()
362 		dev_err(dev, "failed to attach adc irq\n");  in s3c_adc_probe()
366 	adc->clk = devm_clk_get(dev, "adc");  in s3c_adc_probe()
367 	if (IS_ERR(adc->clk)) {  in s3c_adc_probe()
368 		dev_err(dev, "failed to get adc clock\n");  in s3c_adc_probe()
369 		return PTR_ERR(adc->clk);  in s3c_adc_probe()
372 	adc->regs = devm_platform_ioremap_resource(pdev, 0);  in s3c_adc_probe()
373 	if (IS_ERR(adc->regs))  in s3c_adc_probe()
374 		return PTR_ERR(adc->regs);  in s3c_adc_probe()
376 	ret = regulator_enable(adc->vdd);  in s3c_adc_probe()
380 	clk_prepare_enable(adc->clk);  in s3c_adc_probe()
382 	tmp = adc->prescale | S3C2410_ADCCON_PRSCEN;  in s3c_adc_probe()
384 	/* Enable 12-bit ADC resolution */  in s3c_adc_probe()
390 	writel(tmp, adc->regs + S3C2410_ADCCON);  in s3c_adc_probe()
392 	dev_info(dev, "attached adc driver\n");  in s3c_adc_probe()
394 	platform_set_drvdata(pdev, adc);  in s3c_adc_probe()
395 	adc_dev = adc;  in s3c_adc_probe()
402 	struct adc_device *adc = platform_get_drvdata(pdev);  in s3c_adc_remove()  local
404 	clk_disable_unprepare(adc->clk);  in s3c_adc_remove()
405 	regulator_disable(adc->vdd);  in s3c_adc_remove()
411 static int s3c_adc_suspend(struct device *dev)  in s3c_adc_suspend()  argument
413 	struct adc_device *adc = dev_get_drvdata(dev);  in s3c_adc_suspend()  local
417 	spin_lock_irqsave(&adc->lock, flags);  in s3c_adc_suspend()
419 	con = readl(adc->regs + S3C2410_ADCCON);  in s3c_adc_suspend()
421 	writel(con, adc->regs + S3C2410_ADCCON);  in s3c_adc_suspend()
423 	disable_irq(adc->irq);  in s3c_adc_suspend()
424 	spin_unlock_irqrestore(&adc->lock, flags);  in s3c_adc_suspend()
425 	clk_disable(adc->clk);  in s3c_adc_suspend()
426 	regulator_disable(adc->vdd);  in s3c_adc_suspend()
431 static int s3c_adc_resume(struct device *dev)  in s3c_adc_resume()  argument
433 	struct platform_device *pdev = to_platform_device(dev);  in s3c_adc_resume()
434 	struct adc_device *adc = platform_get_drvdata(pdev);  in s3c_adc_resume()  local
435 	enum s3c_cpu_type cpu = platform_get_device_id(pdev)->driver_data;  in s3c_adc_resume()
439 	ret = regulator_enable(adc->vdd);  in s3c_adc_resume()
442 	clk_enable(adc->clk);  in s3c_adc_resume()
443 	enable_irq(adc->irq);  in s3c_adc_resume()
445 	tmp = adc->prescale | S3C2410_ADCCON_PRSCEN;  in s3c_adc_resume()
447 	/* Enable 12-bit ADC resolution */  in s3c_adc_resume()
453 	writel(tmp, adc->regs + S3C2410_ADCCON);  in s3c_adc_resume()
465 		.name           = "s3c24xx-adc",
468 		.name		= "s3c2443-adc",
471 		.name		= "s3c2416-adc",
474 		.name           = "s3c64xx-adc",
477 		.name		= "samsung-adc-v3",
492 		.name	= "s3c-adc",
505 		printk(KERN_ERR "%s: failed to add adc driver\n", __func__);  in adc_init()