1 // SPDX-License-Identifier: GPL-2.0
8 #include <linux/mfd/stm32-timers.h>
32 	status = dmaengine_tx_status(dma->chan, dma->chan->cookie, &state);  in stm32_timers_dma_done()
34 		complete(&dma->completion);  in stm32_timers_dma_done()
38  * stm32_timers_dma_burst_read - Read from timers registers using DMA.
40  * Read from STM32 timers registers using DMA on a single event.
56 	struct regmap *regmap = ddata->regmap;  in stm32_timers_dma_burst_read()
57 	struct stm32_timers_dma *dma = &ddata->dma;  in stm32_timers_dma_burst_read()
69 		return -EINVAL;  in stm32_timers_dma_burst_read()
73 		return -EINVAL;  in stm32_timers_dma_burst_read()
75 	if (!dma->chans[id])  in stm32_timers_dma_burst_read()
76 		return -ENODEV;  in stm32_timers_dma_burst_read()
77 	mutex_lock(&dma->lock);  in stm32_timers_dma_burst_read()
80 	dma->chan = dma->chans[id];  in stm32_timers_dma_burst_read()
83 		ret = -ENOMEM;  in stm32_timers_dma_burst_read()
89 	config.src_addr = (dma_addr_t)dma->phys_base + TIM_DMAR;  in stm32_timers_dma_burst_read()
91 	ret = dmaengine_slave_config(dma->chan, &config);  in stm32_timers_dma_burst_read()
95 	desc = dmaengine_prep_slave_single(dma->chan, dma_buf, len,  in stm32_timers_dma_burst_read()
98 		ret = -EBUSY;  in stm32_timers_dma_burst_read()
102 	desc->callback = stm32_timers_dma_done;  in stm32_timers_dma_burst_read()
103 	desc->callback_param = dma;  in stm32_timers_dma_burst_read()
109 	reinit_completion(&dma->completion);  in stm32_timers_dma_burst_read()
110 	dma_async_issue_pending(dma->chan);  in stm32_timers_dma_burst_read()
113 	dbl = FIELD_PREP(TIM_DCR_DBL, bursts - 1);  in stm32_timers_dma_burst_read()
129 	err = wait_for_completion_interruptible_timeout(&dma->completion,  in stm32_timers_dma_burst_read()
132 		ret = -ETIMEDOUT;  in stm32_timers_dma_burst_read()
141 	dmaengine_terminate_all(dma->chan);  in stm32_timers_dma_burst_read()
145 	dma->chan = NULL;  in stm32_timers_dma_burst_read()
146 	mutex_unlock(&dma->lock);  in stm32_timers_dma_burst_read()
165 	regmap_write(ddata->regmap, TIM_ARR, ~0L);  in stm32_timers_get_arr_size()
166 	regmap_read(ddata->regmap, TIM_ARR, &ddata->max_arr);  in stm32_timers_get_arr_size()
167 	regmap_write(ddata->regmap, TIM_ARR, 0x0);  in stm32_timers_get_arr_size()
177 	init_completion(&ddata->dma.completion);  in stm32_timers_dma_probe()
178 	mutex_init(&ddata->dma.lock);  in stm32_timers_dma_probe()
183 		ddata->dma.chans[i] = dma_request_chan(dev, name);  in stm32_timers_dma_probe()
185 	ddata->dma.chans[STM32_TIMERS_DMA_UP] = dma_request_chan(dev, "up");  in stm32_timers_dma_probe()
186 	ddata->dma.chans[STM32_TIMERS_DMA_TRIG] = dma_request_chan(dev, "trig");  in stm32_timers_dma_probe()
187 	ddata->dma.chans[STM32_TIMERS_DMA_COM] = dma_request_chan(dev, "com");  in stm32_timers_dma_probe()
190 		if (IS_ERR(ddata->dma.chans[i])) {  in stm32_timers_dma_probe()
192 			if (PTR_ERR(ddata->dma.chans[i]) != -ENODEV && !ret)  in stm32_timers_dma_probe()
193 				ret = PTR_ERR(ddata->dma.chans[i]);  in stm32_timers_dma_probe()
195 			ddata->dma.chans[i] = NULL;  in stm32_timers_dma_probe()
208 		if (ddata->dma.chans[i])  in stm32_timers_dma_remove()
209 			dma_release_channel(ddata->dma.chans[i]);  in stm32_timers_dma_remove()
214 	struct device *dev = &pdev->dev;  in stm32_timers_probe()
222 		return -ENOMEM;  in stm32_timers_probe()
230 	ddata->dma.phys_base = res->start;  in stm32_timers_probe()
232 	ddata->regmap = devm_regmap_init_mmio_clk(dev, "int", mmio,  in stm32_timers_probe()
234 	if (IS_ERR(ddata->regmap))  in stm32_timers_probe()
235 		return PTR_ERR(ddata->regmap);  in stm32_timers_probe()
237 	ddata->clk = devm_clk_get(dev, NULL);  in stm32_timers_probe()
238 	if (IS_ERR(ddata->clk))  in stm32_timers_probe()
239 		return PTR_ERR(ddata->clk);  in stm32_timers_probe()
251 	ret = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);  in stm32_timers_probe()
266 	of_platform_depopulate(&pdev->dev);  in stm32_timers_remove()
267 	stm32_timers_dma_remove(&pdev->dev, ddata);  in stm32_timers_remove()
273 	{ .compatible = "st,stm32-timers", },
282 		.name = "stm32-timers",
288 MODULE_DESCRIPTION("STMicroelectronics STM32 Timers");