1 // SPDX-License-Identifier: GPL-2.0
8 #include <linux/mfd/stm32-timers.h>
33 	status = dmaengine_tx_status(dma->chan, dma->chan->cookie, &state);  in stm32_timers_dma_done()
35 		complete(&dma->completion);  in stm32_timers_dma_done()
39  * stm32_timers_dma_burst_read - Read from timers registers using DMA.
41  * Read from STM32 timers registers using DMA on a single event.
57 	struct regmap *regmap = ddata->regmap;  in stm32_timers_dma_burst_read()
58 	struct stm32_timers_dma *dma = &ddata->dma;  in stm32_timers_dma_burst_read()
70 		return -EINVAL;  in stm32_timers_dma_burst_read()
74 		return -EINVAL;  in stm32_timers_dma_burst_read()
76 	if (!dma->chans[id])  in stm32_timers_dma_burst_read()
77 		return -ENODEV;  in stm32_timers_dma_burst_read()
78 	mutex_lock(&dma->lock);  in stm32_timers_dma_burst_read()
81 	dma->chan = dma->chans[id];  in stm32_timers_dma_burst_read()
84 		ret = -ENOMEM;  in stm32_timers_dma_burst_read()
90 	config.src_addr = (dma_addr_t)dma->phys_base + TIM_DMAR;  in stm32_timers_dma_burst_read()
92 	ret = dmaengine_slave_config(dma->chan, &config);  in stm32_timers_dma_burst_read()
96 	desc = dmaengine_prep_slave_single(dma->chan, dma_buf, len,  in stm32_timers_dma_burst_read()
99 		ret = -EBUSY;  in stm32_timers_dma_burst_read()
103 	desc->callback = stm32_timers_dma_done;  in stm32_timers_dma_burst_read()
104 	desc->callback_param = dma;  in stm32_timers_dma_burst_read()
110 	reinit_completion(&dma->completion);  in stm32_timers_dma_burst_read()
111 	dma_async_issue_pending(dma->chan);  in stm32_timers_dma_burst_read()
114 	dbl = FIELD_PREP(TIM_DCR_DBL, bursts - 1);  in stm32_timers_dma_burst_read()
130 	err = wait_for_completion_interruptible_timeout(&dma->completion,  in stm32_timers_dma_burst_read()
133 		ret = -ETIMEDOUT;  in stm32_timers_dma_burst_read()
142 	dmaengine_terminate_all(dma->chan);  in stm32_timers_dma_burst_read()
146 	dma->chan = NULL;  in stm32_timers_dma_burst_read()
147 	mutex_unlock(&dma->lock);  in stm32_timers_dma_burst_read()
165 	regmap_read(ddata->regmap, TIM_ARR, &arr);  in stm32_timers_get_arr_size()
171 	regmap_write(ddata->regmap, TIM_ARR, ~0L);  in stm32_timers_get_arr_size()
172 	regmap_read(ddata->regmap, TIM_ARR, &ddata->max_arr);  in stm32_timers_get_arr_size()
173 	regmap_write(ddata->regmap, TIM_ARR, arr);  in stm32_timers_get_arr_size()
183 	init_completion(&ddata->dma.completion);  in stm32_timers_dma_probe()
184 	mutex_init(&ddata->dma.lock);  in stm32_timers_dma_probe()
189 		ddata->dma.chans[i] = dma_request_chan(dev, name);  in stm32_timers_dma_probe()
191 	ddata->dma.chans[STM32_TIMERS_DMA_UP] = dma_request_chan(dev, "up");  in stm32_timers_dma_probe()
192 	ddata->dma.chans[STM32_TIMERS_DMA_TRIG] = dma_request_chan(dev, "trig");  in stm32_timers_dma_probe()
193 	ddata->dma.chans[STM32_TIMERS_DMA_COM] = dma_request_chan(dev, "com");  in stm32_timers_dma_probe()
196 		if (IS_ERR(ddata->dma.chans[i])) {  in stm32_timers_dma_probe()
198 			if (PTR_ERR(ddata->dma.chans[i]) != -ENODEV && !ret)  in stm32_timers_dma_probe()
199 				ret = PTR_ERR(ddata->dma.chans[i]);  in stm32_timers_dma_probe()
201 			ddata->dma.chans[i] = NULL;  in stm32_timers_dma_probe()
214 		if (ddata->dma.chans[i])  in stm32_timers_dma_remove()
215 			dma_release_channel(ddata->dma.chans[i]);  in stm32_timers_dma_remove()
219 	"brk", "up", "trg-com", "cc"
228 	 * STM32 Timer may have either:  in stm32_timers_irq_probe()
229 	 * - a unique global interrupt line  in stm32_timers_irq_probe()
230 	 * - four dedicated interrupt lines that may be handled separately.  in stm32_timers_irq_probe()
234 	if (ret < 0 && ret != -ENXIO) {  in stm32_timers_irq_probe()
236 	} else if (ret != -ENXIO) {  in stm32_timers_irq_probe()
237 		ddata->irq[STM32_TIMERS_IRQ_GLOBAL_BRK] = ret;  in stm32_timers_irq_probe()
238 		ddata->nr_irqs = 1;  in stm32_timers_irq_probe()
244 		if (ret < 0 && ret != -ENXIO) {  in stm32_timers_irq_probe()
246 		} else if (ret != -ENXIO) {  in stm32_timers_irq_probe()
247 			ddata->irq[i] = ret;  in stm32_timers_irq_probe()
248 			ddata->nr_irqs++;  in stm32_timers_irq_probe()
252 	if (ddata->nr_irqs && ddata->nr_irqs != STM32_TIMERS_MAX_IRQS) {  in stm32_timers_irq_probe()
253 		dev_err(&pdev->dev, "Invalid number of IRQs %d\n", ddata->nr_irqs);  in stm32_timers_irq_probe()
254 		return -EINVAL;  in stm32_timers_irq_probe()
262 	struct device *dev = &pdev->dev;  in stm32_timers_probe()
270 		return -ENOMEM;  in stm32_timers_probe()
277 	ddata->dma.phys_base = res->start;  in stm32_timers_probe()
279 	ddata->regmap = devm_regmap_init_mmio_clk(dev, "int", mmio,  in stm32_timers_probe()
281 	if (IS_ERR(ddata->regmap))  in stm32_timers_probe()
282 		return PTR_ERR(ddata->regmap);  in stm32_timers_probe()
284 	ddata->clk = devm_clk_get(dev, NULL);  in stm32_timers_probe()
285 	if (IS_ERR(ddata->clk))  in stm32_timers_probe()
286 		return PTR_ERR(ddata->clk);  in stm32_timers_probe()
302 	ret = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);  in stm32_timers_probe()
317 	of_platform_depopulate(&pdev->dev);  in stm32_timers_remove()
318 	stm32_timers_dma_remove(&pdev->dev, ddata);  in stm32_timers_remove()
322 	{ .compatible = "st,stm32-timers", },
331 		.name = "stm32-timers",
337 MODULE_DESCRIPTION("STMicroelectronics STM32 Timers");