3  * JZ4740 SoC ADC driver
14  * This driver synchronizes access to the JZ4740 ADC core between the
31 #include <linux/jz4740-adc.h>
83 /* Refcounting for the ADC clock is done in here instead of in the clock
86 static inline void jz4740_adc_clk_enable(struct jz4740_adc *adc)  in jz4740_adc_clk_enable()  argument
88 	if (atomic_inc_return(&adc->clk_ref) == 1)  in jz4740_adc_clk_enable()
89 		clk_prepare_enable(adc->clk);  in jz4740_adc_clk_enable()
92 static inline void jz4740_adc_clk_disable(struct jz4740_adc *adc)  in jz4740_adc_clk_disable()  argument
94 	if (atomic_dec_return(&adc->clk_ref) == 0)  in jz4740_adc_clk_disable()
95 		clk_disable_unprepare(adc->clk);  in jz4740_adc_clk_disable()
98 static inline void jz4740_adc_set_enabled(struct jz4740_adc *adc, int engine,  in jz4740_adc_set_enabled()  argument
104 	spin_lock_irqsave(&adc->lock, flags);  in jz4740_adc_set_enabled()
106 	val = readb(adc->base + JZ_REG_ADC_ENABLE);  in jz4740_adc_set_enabled()
111 	writeb(val, adc->base + JZ_REG_ADC_ENABLE);  in jz4740_adc_set_enabled()
113 	spin_unlock_irqrestore(&adc->lock, flags);  in jz4740_adc_set_enabled()
118 	struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);  in jz4740_adc_cell_enable()  local
120 	jz4740_adc_clk_enable(adc);  in jz4740_adc_cell_enable()
121 	jz4740_adc_set_enabled(adc, pdev->id, true);  in jz4740_adc_cell_enable()
128 	struct jz4740_adc *adc = dev_get_drvdata(pdev->dev.parent);  in jz4740_adc_cell_disable()  local
130 	jz4740_adc_set_enabled(adc, pdev->id, false);  in jz4740_adc_cell_disable()
131 	jz4740_adc_clk_disable(adc);  in jz4740_adc_cell_disable()
138 	struct jz4740_adc *adc = dev_get_drvdata(dev);  in jz4740_adc_set_config()  local
142 	if (!adc)  in jz4740_adc_set_config()
145 	spin_lock_irqsave(&adc->lock, flags);  in jz4740_adc_set_config()
147 	cfg = readl(adc->base + JZ_REG_ADC_CFG);  in jz4740_adc_set_config()
152 	writel(cfg, adc->base + JZ_REG_ADC_CFG);  in jz4740_adc_set_config()
154 	spin_unlock_irqrestore(&adc->lock, flags);  in jz4740_adc_set_config()
209 	struct jz4740_adc *adc;  in jz4740_adc_probe()  local
214 	adc = devm_kzalloc(&pdev->dev, sizeof(*adc), GFP_KERNEL);  in jz4740_adc_probe()
215 	if (!adc)  in jz4740_adc_probe()
218 	adc->irq = platform_get_irq(pdev, 0);  in jz4740_adc_probe()
219 	if (adc->irq < 0) {  in jz4740_adc_probe()
220 		ret = adc->irq;  in jz4740_adc_probe()
238 	adc->mem = request_mem_region(mem_base->start, JZ_REG_ADC_STATUS,  in jz4740_adc_probe()
240 	if (!adc->mem) {  in jz4740_adc_probe()
245 	adc->base = ioremap_nocache(adc->mem->start, resource_size(adc->mem));  in jz4740_adc_probe()
246 	if (!adc->base) {  in jz4740_adc_probe()
252 	adc->clk = clk_get(&pdev->dev, "adc");  in jz4740_adc_probe()
253 	if (IS_ERR(adc->clk)) {  in jz4740_adc_probe()
254 		ret = PTR_ERR(adc->clk);  in jz4740_adc_probe()
259 	spin_lock_init(&adc->lock);  in jz4740_adc_probe()
260 	atomic_set(&adc->clk_ref, 0);  in jz4740_adc_probe()
262 	platform_set_drvdata(pdev, adc);  in jz4740_adc_probe()
264 	gc = irq_alloc_generic_chip("INTC", 1, irq_base, adc->base,  in jz4740_adc_probe()
277 	adc->gc = gc;  in jz4740_adc_probe()
279 	irq_set_chained_handler_and_data(adc->irq, jz4740_adc_irq_demux, gc);  in jz4740_adc_probe()
281 	writeb(0x00, adc->base + JZ_REG_ADC_ENABLE);  in jz4740_adc_probe()
282 	writeb(0xff, adc->base + JZ_REG_ADC_CTRL);  in jz4740_adc_probe()
293 	clk_put(adc->clk);  in jz4740_adc_probe()
295 	iounmap(adc->base);  in jz4740_adc_probe()
297 	release_mem_region(adc->mem->start, resource_size(adc->mem));  in jz4740_adc_probe()
303 	struct jz4740_adc *adc = platform_get_drvdata(pdev);  in jz4740_adc_remove()  local
307 	irq_remove_generic_chip(adc->gc, IRQ_MSK(5), IRQ_NOPROBE | IRQ_LEVEL, 0);  in jz4740_adc_remove()
308 	kfree(adc->gc);  in jz4740_adc_remove()
309 	irq_set_chained_handler_and_data(adc->irq, NULL, NULL);  in jz4740_adc_remove()
311 	iounmap(adc->base);  in jz4740_adc_remove()
312 	release_mem_region(adc->mem->start, resource_size(adc->mem));  in jz4740_adc_remove()
314 	clk_put(adc->clk);  in jz4740_adc_remove()
323 		.name = "jz4740-adc",
329 MODULE_DESCRIPTION("JZ4740 SoC ADC driver");
332 MODULE_ALIAS("platform:jz4740-adc");