1 // SPDX-License-Identifier: GPL-2.0-only
3 // Author: Li-hao Kuo <lhjeff911@gmail.com>
8 #include <linux/dma-mapping.h>
15 #include <linux/spi/spi.h>
104 	data_status = readl(pspim->s_base + SP7021_DATA_RDY_REG);  in sp7021_spi_slave_irq()
106 	writel(data_status , pspim->s_base + SP7021_DATA_RDY_REG);  in sp7021_spi_slave_irq()
107 	complete(&pspim->slave_isr);  in sp7021_spi_slave_irq()
115 	complete(&pspim->slave_isr);  in sp7021_spi_slave_abort()
116 	complete(&pspim->isr_done);  in sp7021_spi_slave_abort()
120 static int sp7021_spi_slave_tx(struct spi_device *spi, struct spi_transfer *xfer)  in sp7021_spi_slave_tx()  argument
122 	struct sp7021_spi_ctlr *pspim = spi_controller_get_devdata(spi->controller);  in sp7021_spi_slave_tx()
125 	reinit_completion(&pspim->slave_isr);  in sp7021_spi_slave_tx()
127 	writel(value, pspim->s_base + SP7021_SLAVE_DMA_CTRL_REG);  in sp7021_spi_slave_tx()
128 	writel(xfer->len, pspim->s_base + SP7021_SLAVE_DMA_LENGTH_REG);  in sp7021_spi_slave_tx()
129 	writel(xfer->tx_dma, pspim->s_base + SP7021_SLAVE_DMA_ADDR_REG);  in sp7021_spi_slave_tx()
130 	value = readl(pspim->s_base + SP7021_DATA_RDY_REG);  in sp7021_spi_slave_tx()
132 	writel(value, pspim->s_base + SP7021_DATA_RDY_REG);  in sp7021_spi_slave_tx()
133 	if (wait_for_completion_interruptible(&pspim->isr_done)) {  in sp7021_spi_slave_tx()
134 		dev_err(&spi->dev, "%s() wait_for_completion err\n", __func__);  in sp7021_spi_slave_tx()
135 		return -EINTR;  in sp7021_spi_slave_tx()
140 static int sp7021_spi_slave_rx(struct spi_device *spi, struct spi_transfer *xfer)  in sp7021_spi_slave_rx()  argument
142 	struct sp7021_spi_ctlr *pspim = spi_controller_get_devdata(spi->controller);  in sp7021_spi_slave_rx()
145 	reinit_completion(&pspim->isr_done);  in sp7021_spi_slave_rx()
147 	writel(value, pspim->s_base + SP7021_SLAVE_DMA_CTRL_REG);  in sp7021_spi_slave_rx()
148 	writel(xfer->len, pspim->s_base + SP7021_SLAVE_DMA_LENGTH_REG);  in sp7021_spi_slave_rx()
149 	writel(xfer->rx_dma, pspim->s_base + SP7021_SLAVE_DMA_ADDR_REG);  in sp7021_spi_slave_rx()
150 	if (wait_for_completion_interruptible(&pspim->isr_done)) {  in sp7021_spi_slave_rx()
151 		dev_err(&spi->dev, "%s() wait_for_completion err\n", __func__);  in sp7021_spi_slave_rx()
152 		return -EINTR;  in sp7021_spi_slave_rx()
154 	writel(SP7021_SLAVE_SW_RST, pspim->s_base + SP7021_SLAVE_DMA_CTRL_REG);  in sp7021_spi_slave_rx()
163 		pspim->rx_buf[pspim->rx_cur_len] =  in sp7021_spi_master_rb()
164 			readl(pspim->m_base + SP7021_FIFO_REG);  in sp7021_spi_master_rb()
165 		pspim->rx_cur_len++;  in sp7021_spi_master_rb()
174 		writel(pspim->tx_buf[pspim->tx_cur_len],  in sp7021_spi_master_wb()
175 		       pspim->m_base + SP7021_FIFO_REG);  in sp7021_spi_master_wb()
176 		pspim->tx_cur_len++;  in sp7021_spi_master_wb()
189 	fd_status = readl(pspim->m_base + SP7021_SPI_STATUS_REG);  in sp7021_spi_master_irq()
202 		rx_cnt = pspim->data_unit;  in sp7021_spi_master_irq()
204 	tx_cnt = min(tx_len - pspim->tx_cur_len, pspim->data_unit - tx_cnt);  in sp7021_spi_master_irq()
205 	dev_dbg(pspim->dev, "fd_st=0x%x rx_c:%d tx_c:%d tx_l:%d",  in sp7021_spi_master_irq()
213 	fd_status = readl(pspim->m_base + SP7021_SPI_STATUS_REG);  in sp7021_spi_master_irq()
217 	if (fd_status & SP7021_FINISH_FLAG || tx_len == pspim->tx_cur_len) {  in sp7021_spi_master_irq()
218 		while (total_len != pspim->rx_cur_len) {  in sp7021_spi_master_irq()
219 			fd_status = readl(pspim->m_base + SP7021_SPI_STATUS_REG);  in sp7021_spi_master_irq()
222 				rx_cnt = pspim->data_unit;  in sp7021_spi_master_irq()
229 		value = readl(pspim->m_base + SP7021_INT_BUSY_REG);  in sp7021_spi_master_irq()
231 		writel(value, pspim->m_base + SP7021_INT_BUSY_REG);  in sp7021_spi_master_irq()
232 		writel(SP7021_FINISH_FLAG, pspim->m_base + SP7021_SPI_STATUS_REG);  in sp7021_spi_master_irq()
237 		complete(&pspim->isr_done);  in sp7021_spi_master_irq()
241 static void sp7021_prep_transfer(struct spi_controller *ctlr, struct spi_device *spi)  in sp7021_prep_transfer()  argument
245 	pspim->tx_cur_len = 0;  in sp7021_prep_transfer()
246 	pspim->rx_cur_len = 0;  in sp7021_prep_transfer()
247 	pspim->data_unit = SP7021_FIFO_DATA_LEN;  in sp7021_prep_transfer()
255 	struct spi_device *s = msg->spi;  in sp7021_spi_controller_prepare_message()
258 	valus = readl(pspim->m_base + SP7021_SPI_STATUS_REG);  in sp7021_spi_controller_prepare_message()
260 	writel(valus, pspim->m_base + SP7021_SPI_STATUS_REG);  in sp7021_spi_controller_prepare_message()
262 	if (s->mode & SPI_CPOL)  in sp7021_spi_controller_prepare_message()
265 	if (s->mode & SPI_LSB_FIRST)  in sp7021_spi_controller_prepare_message()
268 	if (s->mode & SPI_CS_HIGH)  in sp7021_spi_controller_prepare_message()
271 	if (s->mode & SPI_CPHA)  in sp7021_spi_controller_prepare_message()
277 	pspim->xfer_conf = rs;  in sp7021_spi_controller_prepare_message()
278 	if (pspim->xfer_conf & SP7021_CPOL_FD)  in sp7021_spi_controller_prepare_message()
279 		writel(pspim->xfer_conf, pspim->m_base + SP7021_SPI_CONFIG_REG);  in sp7021_spi_controller_prepare_message()
289 	clk_rate = clk_get_rate(pspim->spi_clk);  in sp7021_spi_setup_clk()
290 	div = max(2U, clk_rate / xfer->speed_hz);  in sp7021_spi_setup_clk()
292 	clk_sel = (div / 2) - 1;  in sp7021_spi_setup_clk()
293 	pspim->xfer_conf &= ~SP7021_CLK_MASK;  in sp7021_spi_setup_clk()
294 	pspim->xfer_conf |= FIELD_PREP(SP7021_CLK_MASK, clk_sel);  in sp7021_spi_setup_clk()
295 	writel(pspim->xfer_conf, pspim->m_base + SP7021_SPI_CONFIG_REG);  in sp7021_spi_setup_clk()
298 static int sp7021_spi_master_transfer_one(struct spi_controller *ctlr, struct spi_device *spi,  in sp7021_spi_master_transfer_one()  argument
307 	xfer_cnt = xfer->len / SP7021_SPI_DATA_SIZE;  in sp7021_spi_master_transfer_one()
308 	last_len = xfer->len % SP7021_SPI_DATA_SIZE;  in sp7021_spi_master_transfer_one()
311 		mutex_lock(&pspim->buf_lock);  in sp7021_spi_master_transfer_one()
312 		sp7021_prep_transfer(ctlr, spi);  in sp7021_spi_master_transfer_one()
314 		reinit_completion(&pspim->isr_done);  in sp7021_spi_master_transfer_one()
321 		pspim->tx_buf = xfer->tx_buf + i * SP7021_SPI_DATA_SIZE;  in sp7021_spi_master_transfer_one()
322 		pspim->rx_buf = xfer->rx_buf + i * SP7021_SPI_DATA_SIZE;  in sp7021_spi_master_transfer_one()
324 		if (pspim->tx_cur_len < xfer_len) {  in sp7021_spi_master_transfer_one()
325 			len_temp = min(pspim->data_unit, xfer_len);  in sp7021_spi_master_transfer_one()
328 		reg_temp = readl(pspim->m_base + SP7021_SPI_CONFIG_REG);  in sp7021_spi_master_transfer_one()
334 		writel(reg_temp, pspim->m_base + SP7021_SPI_CONFIG_REG);  in sp7021_spi_master_transfer_one()
339 		writel(reg_temp, pspim->m_base + SP7021_SPI_STATUS_REG);  in sp7021_spi_master_transfer_one()
341 		if (!wait_for_completion_interruptible_timeout(&pspim->isr_done, timeout)) {  in sp7021_spi_master_transfer_one()
342 			dev_err(&spi->dev, "wait_for_completion err\n");  in sp7021_spi_master_transfer_one()
343 			mutex_unlock(&pspim->buf_lock);  in sp7021_spi_master_transfer_one()
344 			return -ETIMEDOUT;  in sp7021_spi_master_transfer_one()
347 		reg_temp = readl(pspim->m_base + SP7021_SPI_STATUS_REG);  in sp7021_spi_master_transfer_one()
349 			writel(SP7021_FINISH_FLAG, pspim->m_base + SP7021_SPI_STATUS_REG);  in sp7021_spi_master_transfer_one()
350 			writel(readl(pspim->m_base + SP7021_SPI_CONFIG_REG) &  in sp7021_spi_master_transfer_one()
351 				SP7021_CLEAN_FLUG_MASK, pspim->m_base + SP7021_SPI_CONFIG_REG);  in sp7021_spi_master_transfer_one()
354 		if (pspim->xfer_conf & SP7021_CPOL_FD)  in sp7021_spi_master_transfer_one()
355 			writel(pspim->xfer_conf, pspim->m_base + SP7021_SPI_CONFIG_REG);  in sp7021_spi_master_transfer_one()
357 		mutex_unlock(&pspim->buf_lock);  in sp7021_spi_master_transfer_one()
362 static int sp7021_spi_slave_transfer_one(struct spi_controller *ctlr, struct spi_device *spi,  in sp7021_spi_slave_transfer_one()  argument
366 	struct device *dev = pspim->dev;  in sp7021_spi_slave_transfer_one()
369 	if (xfer->tx_buf && !xfer->rx_buf) {  in sp7021_spi_slave_transfer_one()
370 		xfer->tx_dma = dma_map_single(dev, (void *)xfer->tx_buf,  in sp7021_spi_slave_transfer_one()
371 					      xfer->len, DMA_TO_DEVICE);  in sp7021_spi_slave_transfer_one()
372 		if (dma_mapping_error(dev, xfer->tx_dma))  in sp7021_spi_slave_transfer_one()
373 			return -ENOMEM;  in sp7021_spi_slave_transfer_one()
374 		ret = sp7021_spi_slave_tx(spi, xfer);  in sp7021_spi_slave_transfer_one()
375 		dma_unmap_single(dev, xfer->tx_dma, xfer->len, DMA_TO_DEVICE);  in sp7021_spi_slave_transfer_one()
376 	} else if (xfer->rx_buf && !xfer->tx_buf) {  in sp7021_spi_slave_transfer_one()
377 		xfer->rx_dma = dma_map_single(dev, xfer->rx_buf, xfer->len,  in sp7021_spi_slave_transfer_one()
379 		if (dma_mapping_error(dev, xfer->rx_dma))  in sp7021_spi_slave_transfer_one()
380 			return -ENOMEM;  in sp7021_spi_slave_transfer_one()
381 		ret = sp7021_spi_slave_rx(spi, xfer);  in sp7021_spi_slave_transfer_one()
382 		dma_unmap_single(dev, xfer->rx_dma, xfer->len, DMA_FROM_DEVICE);  in sp7021_spi_slave_transfer_one()
384 		dev_dbg(&ctlr->dev, "%s() wrong command\n", __func__);  in sp7021_spi_slave_transfer_one()
385 		return -EINVAL;  in sp7021_spi_slave_transfer_one()
404 	struct device *dev = &pdev->dev;  in sp7021_spi_controller_probe()
409 	pdev->id = of_alias_get_id(pdev->dev.of_node, "sp_spi");  in sp7021_spi_controller_probe()
411 	if (device_property_read_bool(dev, "spi-slave"))  in sp7021_spi_controller_probe()
421 		return -ENOMEM;  in sp7021_spi_controller_probe()
422 	device_set_node(&ctlr->dev, dev_fwnode(dev));  in sp7021_spi_controller_probe()
423 	ctlr->bus_num = pdev->id;  in sp7021_spi_controller_probe()
424 	ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;  in sp7021_spi_controller_probe()
425 	ctlr->auto_runtime_pm = true;  in sp7021_spi_controller_probe()
426 	ctlr->prepare_message = sp7021_spi_controller_prepare_message;  in sp7021_spi_controller_probe()
428 		ctlr->transfer_one = sp7021_spi_slave_transfer_one;  in sp7021_spi_controller_probe()
429 		ctlr->slave_abort = sp7021_spi_slave_abort;  in sp7021_spi_controller_probe()
430 		ctlr->flags = SPI_CONTROLLER_HALF_DUPLEX;  in sp7021_spi_controller_probe()
432 		ctlr->bits_per_word_mask = SPI_BPW_MASK(8);  in sp7021_spi_controller_probe()
433 		ctlr->min_speed_hz = 40000;  in sp7021_spi_controller_probe()
434 		ctlr->max_speed_hz = 25000000;  in sp7021_spi_controller_probe()
435 		ctlr->use_gpio_descriptors = true;  in sp7021_spi_controller_probe()
436 		ctlr->flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX;  in sp7021_spi_controller_probe()
437 		ctlr->transfer_one = sp7021_spi_master_transfer_one;  in sp7021_spi_controller_probe()
441 	pspim->mode = mode;  in sp7021_spi_controller_probe()
442 	pspim->ctlr = ctlr;  in sp7021_spi_controller_probe()
443 	pspim->dev = dev;  in sp7021_spi_controller_probe()
444 	mutex_init(&pspim->buf_lock);  in sp7021_spi_controller_probe()
445 	init_completion(&pspim->isr_done);  in sp7021_spi_controller_probe()
446 	init_completion(&pspim->slave_isr);  in sp7021_spi_controller_probe()
448 	pspim->m_base = devm_platform_ioremap_resource_byname(pdev, "master");  in sp7021_spi_controller_probe()
449 	if (IS_ERR(pspim->m_base))  in sp7021_spi_controller_probe()
450 		return dev_err_probe(dev, PTR_ERR(pspim->m_base), "m_base get fail\n");  in sp7021_spi_controller_probe()
452 	pspim->s_base = devm_platform_ioremap_resource_byname(pdev, "slave");  in sp7021_spi_controller_probe()
453 	if (IS_ERR(pspim->s_base))  in sp7021_spi_controller_probe()
454 		return dev_err_probe(dev, PTR_ERR(pspim->s_base), "s_base get fail\n");  in sp7021_spi_controller_probe()
456 	pspim->m_irq = platform_get_irq_byname(pdev, "master_risc");  in sp7021_spi_controller_probe()
457 	if (pspim->m_irq < 0)  in sp7021_spi_controller_probe()
458 		return pspim->m_irq;  in sp7021_spi_controller_probe()
460 	pspim->s_irq = platform_get_irq_byname(pdev, "slave_risc");  in sp7021_spi_controller_probe()
461 	if (pspim->s_irq < 0)  in sp7021_spi_controller_probe()
462 		return pspim->s_irq;  in sp7021_spi_controller_probe()
464 	pspim->spi_clk = devm_clk_get(dev, NULL);  in sp7021_spi_controller_probe()
465 	if (IS_ERR(pspim->spi_clk))  in sp7021_spi_controller_probe()
466 		return dev_err_probe(dev, PTR_ERR(pspim->spi_clk), "clk get fail\n");  in sp7021_spi_controller_probe()
468 	pspim->rstc = devm_reset_control_get_exclusive(dev, NULL);  in sp7021_spi_controller_probe()
469 	if (IS_ERR(pspim->rstc))  in sp7021_spi_controller_probe()
470 		return dev_err_probe(dev, PTR_ERR(pspim->rstc), "rst get fail\n");  in sp7021_spi_controller_probe()
472 	ret = clk_prepare_enable(pspim->spi_clk);  in sp7021_spi_controller_probe()
476 	ret = devm_add_action_or_reset(dev, sp7021_spi_disable_unprepare, pspim->spi_clk);  in sp7021_spi_controller_probe()
480 	ret = reset_control_deassert(pspim->rstc);  in sp7021_spi_controller_probe()
484 	ret = devm_add_action_or_reset(dev, sp7021_spi_reset_control_assert, pspim->rstc);  in sp7021_spi_controller_probe()
488 	ret = devm_request_irq(dev, pspim->m_irq, sp7021_spi_master_irq,  in sp7021_spi_controller_probe()
489 			       IRQF_TRIGGER_RISING, pdev->name, pspim);  in sp7021_spi_controller_probe()
493 	ret = devm_request_irq(dev, pspim->s_irq, sp7021_spi_slave_irq,  in sp7021_spi_controller_probe()
494 			       IRQF_TRIGGER_RISING, pdev->name, pspim);  in sp7021_spi_controller_probe()
509 	struct spi_controller *ctlr = dev_get_drvdata(&pdev->dev);  in sp7021_spi_controller_remove()
512 	pm_runtime_disable(&pdev->dev);  in sp7021_spi_controller_remove()
513 	pm_runtime_set_suspended(&pdev->dev);  in sp7021_spi_controller_remove()
521 	return reset_control_assert(pspim->rstc);  in sp7021_spi_controller_suspend()
529 	reset_control_deassert(pspim->rstc);  in sp7021_spi_controller_resume()
530 	return clk_prepare_enable(pspim->spi_clk);  in sp7021_spi_controller_resume()
539 	return reset_control_assert(pspim->rstc);  in sp7021_spi_runtime_suspend()
547 	return reset_control_deassert(pspim->rstc);  in sp7021_spi_runtime_resume()
559 	{ .compatible = "sunplus,sp7021-spi" },
568 		.name = "sunplus,sp7021-spi-controller",
575 MODULE_AUTHOR("Li-hao Kuo <lhjeff911@gmail.com>");
576 MODULE_DESCRIPTION("Sunplus SPI controller driver");