2  * Driver for Amlogic Meson SPI communication controller (SPICC)
34  * reading threshold, SPICC starts a reading DMA burst, which reads the preset
37  * writing threshold, SPICC starts a writing request burst, which reads the
206 static void meson_spicc_oen_enable(struct meson_spicc_device *spicc)  in meson_spicc_oen_enable()  argument
210 	if (!spicc->data->has_oen) {  in meson_spicc_oen_enable()
212 		spicc->pins_idle_high = pinctrl_lookup_state(spicc->pinctrl,  in meson_spicc_oen_enable()
214 		if (IS_ERR(spicc->pins_idle_high)) {  in meson_spicc_oen_enable()
215 			dev_warn(&spicc->pdev->dev, "can't get idle-high pinctrl\n");  in meson_spicc_oen_enable()
216 			spicc->pins_idle_high = NULL;  in meson_spicc_oen_enable()
218 		spicc->pins_idle_low = pinctrl_lookup_state(spicc->pinctrl,  in meson_spicc_oen_enable()
220 		if (IS_ERR(spicc->pins_idle_low)) {  in meson_spicc_oen_enable()
221 			dev_warn(&spicc->pdev->dev, "can't get idle-low pinctrl\n");  in meson_spicc_oen_enable()
222 			spicc->pins_idle_low = NULL;  in meson_spicc_oen_enable()
227 	conf = readl_relaxed(spicc->base + SPICC_ENH_CTL0) |  in meson_spicc_oen_enable()
230 	writel_relaxed(conf, spicc->base + SPICC_ENH_CTL0);  in meson_spicc_oen_enable()
233 static int meson_spicc_dma_map(struct meson_spicc_device *spicc,  in meson_spicc_dma_map()  argument
236 	struct device *dev = spicc->host->dev.parent;  in meson_spicc_dma_map()
249 	spicc->tx_dma = t->tx_dma;  in meson_spicc_dma_map()
250 	spicc->rx_dma = t->rx_dma;  in meson_spicc_dma_map()
255 static void meson_spicc_dma_unmap(struct meson_spicc_device *spicc,  in meson_spicc_dma_unmap()  argument
258 	struct device *dev = spicc->host->dev.parent;  in meson_spicc_dma_unmap()
270 static u32 meson_spicc_calc_dma_len(struct meson_spicc_device *spicc,  in meson_spicc_calc_dma_len()  argument
275 	if (len <= spicc->data->fifo_size) {  in meson_spicc_calc_dma_len()
303 static void meson_spicc_setup_dma(struct meson_spicc_device *spicc)  in meson_spicc_setup_dma()  argument
314 	writel_relaxed(spicc->tx_dma, spicc->base + SPICC_DRADDR);  in meson_spicc_setup_dma()
315 	writel_relaxed(spicc->rx_dma, spicc->base + SPICC_DWADDR);  in meson_spicc_setup_dma()
322 			    spicc->base + SPICC_CONREG);  in meson_spicc_setup_dma()
324 	len = meson_spicc_calc_dma_len(spicc, spicc->xfer_remain,  in meson_spicc_setup_dma()
326 	spicc->xfer_remain -= len;  in meson_spicc_setup_dma()
330 	if (spicc->tx_dma) {  in meson_spicc_setup_dma()
331 		spicc->tx_dma += len;  in meson_spicc_setup_dma()
333 		txfifo_thres = spicc->data->fifo_size - dma_burst_len;  in meson_spicc_setup_dma()
338 	if (spicc->rx_dma) {  in meson_spicc_setup_dma()
339 		spicc->rx_dma += len;  in meson_spicc_setup_dma()
346 	writel_relaxed(count_en, spicc->base + SPICC_LD_CNTL0);  in meson_spicc_setup_dma()
347 	writel_relaxed(ld_ctr1, spicc->base + SPICC_LD_CNTL1);  in meson_spicc_setup_dma()
354 		    spicc->base + SPICC_DMAREG);  in meson_spicc_setup_dma()
357 static irqreturn_t meson_spicc_dma_irq(struct meson_spicc_device *spicc)  in meson_spicc_dma_irq()  argument
359 	if (readl_relaxed(spicc->base + SPICC_DMAREG) & SPICC_DMA_ENABLE)  in meson_spicc_dma_irq()
362 	if (spicc->xfer_remain) {  in meson_spicc_dma_irq()
363 		meson_spicc_setup_dma(spicc);  in meson_spicc_dma_irq()
365 		writel_bits_relaxed(SPICC_SMC, 0, spicc->base + SPICC_CONREG);  in meson_spicc_dma_irq()
366 		writel_relaxed(0, spicc->base + SPICC_INTREG);  in meson_spicc_dma_irq()
367 		writel_relaxed(0, spicc->base + SPICC_DMAREG);  in meson_spicc_dma_irq()
368 		meson_spicc_dma_unmap(spicc, spicc->xfer);  in meson_spicc_dma_irq()
369 		complete(&spicc->done);  in meson_spicc_dma_irq()
375 static inline bool meson_spicc_txfull(struct meson_spicc_device *spicc)  in meson_spicc_txfull()  argument
378 			   readl_relaxed(spicc->base + SPICC_STATREG));  in meson_spicc_txfull()
381 static inline bool meson_spicc_rxready(struct meson_spicc_device *spicc)  in meson_spicc_rxready()  argument
384 			 readl_relaxed(spicc->base + SPICC_STATREG));  in meson_spicc_rxready()
387 static inline u32 meson_spicc_pull_data(struct meson_spicc_device *spicc)  in meson_spicc_pull_data()  argument
389 	unsigned int bytes = spicc->bytes_per_word;  in meson_spicc_pull_data()
395 		byte = *spicc->tx_buf++;  in meson_spicc_pull_data()
400 	spicc->tx_remain--;  in meson_spicc_pull_data()
404 static inline void meson_spicc_push_data(struct meson_spicc_device *spicc,  in meson_spicc_push_data()  argument
407 	unsigned int bytes = spicc->bytes_per_word;  in meson_spicc_push_data()
413 		*spicc->rx_buf++ = byte;  in meson_spicc_push_data()
417 	spicc->rx_remain--;  in meson_spicc_push_data()
420 static inline void meson_spicc_rx(struct meson_spicc_device *spicc)  in meson_spicc_rx()  argument
423 	while (spicc->rx_remain &&  in meson_spicc_rx()
424 	       meson_spicc_rxready(spicc))  in meson_spicc_rx()
425 		meson_spicc_push_data(spicc,  in meson_spicc_rx()
426 				readl_relaxed(spicc->base + SPICC_RXDATA));  in meson_spicc_rx()
429 static inline void meson_spicc_tx(struct meson_spicc_device *spicc)  in meson_spicc_tx()  argument
432 	while (spicc->tx_remain &&  in meson_spicc_tx()
433 	       !meson_spicc_txfull(spicc))  in meson_spicc_tx()
434 		writel_relaxed(meson_spicc_pull_data(spicc),  in meson_spicc_tx()
435 			       spicc->base + SPICC_TXDATA);  in meson_spicc_tx()
438 static inline void meson_spicc_setup_burst(struct meson_spicc_device *spicc)  in meson_spicc_setup_burst()  argument
442 				       spicc->xfer_remain /  in meson_spicc_setup_burst()
443 				       spicc->bytes_per_word,  in meson_spicc_setup_burst()
444 				       spicc->data->fifo_size);  in meson_spicc_setup_burst()
446 	spicc->tx_remain = burst_len;  in meson_spicc_setup_burst()
447 	spicc->rx_remain = burst_len;  in meson_spicc_setup_burst()
448 	spicc->xfer_remain -= burst_len * spicc->bytes_per_word;  in meson_spicc_setup_burst()
454 			spicc->base + SPICC_CONREG);  in meson_spicc_setup_burst()
457 	meson_spicc_tx(spicc);  in meson_spicc_setup_burst()
462 	struct meson_spicc_device *spicc = (void *) data;  in meson_spicc_irq()  local
464 	writel_bits_relaxed(SPICC_TC, SPICC_TC, spicc->base + SPICC_STATREG);  in meson_spicc_irq()
466 	if (spicc->using_dma)  in meson_spicc_irq()
467 		return meson_spicc_dma_irq(spicc);  in meson_spicc_irq()
470 	meson_spicc_rx(spicc);  in meson_spicc_irq()
472 	if (!spicc->xfer_remain) {  in meson_spicc_irq()
474 		writel(0, spicc->base + SPICC_INTREG);  in meson_spicc_irq()
476 		complete(&spicc->done);  in meson_spicc_irq()
482 	meson_spicc_setup_burst(spicc);  in meson_spicc_irq()
485 	writel_bits_relaxed(SPICC_XCH, SPICC_XCH, spicc->base + SPICC_CONREG);  in meson_spicc_irq()
490 static void meson_spicc_auto_io_delay(struct meson_spicc_device *spicc)  in meson_spicc_auto_io_delay()  argument
496 	if (spicc->data->has_enhance_clk_div) {  in meson_spicc_auto_io_delay()
498 				readl_relaxed(spicc->base + SPICC_ENH_CTL0));  in meson_spicc_auto_io_delay()
503 				readl_relaxed(spicc->base + SPICC_CONREG));  in meson_spicc_auto_io_delay()
510 	hz = clk_get_rate(spicc->clk);  in meson_spicc_auto_io_delay()
525 	conf = readl_relaxed(spicc->base + SPICC_TESTREG);  in meson_spicc_auto_io_delay()
530 	writel_relaxed(conf, spicc->base + SPICC_TESTREG);  in meson_spicc_auto_io_delay()
533 static void meson_spicc_setup_xfer(struct meson_spicc_device *spicc,  in meson_spicc_setup_xfer()  argument
539 	conf = conf_orig = readl_relaxed(spicc->base + SPICC_CONREG);  in meson_spicc_setup_xfer()
544 			   (spicc->bytes_per_word << 3) - 1);  in meson_spicc_setup_xfer()
548 		writel_relaxed(conf, spicc->base + SPICC_CONREG);  in meson_spicc_setup_xfer()
550 	clk_set_rate(spicc->clk, xfer->speed_hz);  in meson_spicc_setup_xfer()
552 	meson_spicc_auto_io_delay(spicc);  in meson_spicc_setup_xfer()
554 	writel_relaxed(0, spicc->base + SPICC_DMAREG);  in meson_spicc_setup_xfer()
557 static void meson_spicc_reset_fifo(struct meson_spicc_device *spicc)  in meson_spicc_reset_fifo()  argument
559 	if (spicc->data->has_oen)  in meson_spicc_reset_fifo()
562 				    spicc->base + SPICC_ENH_CTL0);  in meson_spicc_reset_fifo()
565 			    spicc->base + SPICC_TESTREG);  in meson_spicc_reset_fifo()
567 	while (meson_spicc_rxready(spicc))  in meson_spicc_reset_fifo()
568 		readl_relaxed(spicc->base + SPICC_RXDATA);  in meson_spicc_reset_fifo()
570 	if (spicc->data->has_oen)  in meson_spicc_reset_fifo()
572 				    spicc->base + SPICC_ENH_CTL0);  in meson_spicc_reset_fifo()
579 	struct meson_spicc_device *spicc = spi_controller_get_devdata(host);  in meson_spicc_transfer_one()  local
583 	spicc->xfer = xfer;  in meson_spicc_transfer_one()
586 	spicc->tx_buf = (u8 *)xfer->tx_buf;  in meson_spicc_transfer_one()
587 	spicc->rx_buf = (u8 *)xfer->rx_buf;  in meson_spicc_transfer_one()
588 	spicc->xfer_remain = xfer->len;  in meson_spicc_transfer_one()
591 	spicc->bytes_per_word =  in meson_spicc_transfer_one()
592 	   DIV_ROUND_UP(spicc->xfer->bits_per_word, 8);  in meson_spicc_transfer_one()
594 	if (xfer->len % spicc->bytes_per_word)  in meson_spicc_transfer_one()
598 	meson_spicc_setup_xfer(spicc, xfer);  in meson_spicc_transfer_one()
600 	meson_spicc_reset_fifo(spicc);  in meson_spicc_transfer_one()
603 	reinit_completion(&spicc->done);  in meson_spicc_transfer_one()
622 		ret = meson_spicc_dma_map(spicc, xfer);  in meson_spicc_transfer_one()
624 			meson_spicc_dma_unmap(spicc, xfer);  in meson_spicc_transfer_one()
629 		spicc->using_dma = true;  in meson_spicc_transfer_one()
630 		spicc->xfer_remain = DIV_ROUND_UP(xfer->len, spicc->bytes_per_word);  in meson_spicc_transfer_one()
631 		meson_spicc_setup_dma(spicc);  in meson_spicc_transfer_one()
632 		writel_relaxed(SPICC_TE_EN, spicc->base + SPICC_INTREG);  in meson_spicc_transfer_one()
633 		writel_bits_relaxed(SPICC_SMC, SPICC_SMC, spicc->base + SPICC_CONREG);  in meson_spicc_transfer_one()
635 		spicc->using_dma = false;  in meson_spicc_transfer_one()
637 		meson_spicc_setup_burst(spicc);  in meson_spicc_transfer_one()
640 		writel_bits_relaxed(SPICC_XCH, SPICC_XCH, spicc->base + SPICC_CONREG);  in meson_spicc_transfer_one()
643 		writel_relaxed(SPICC_TC_EN, spicc->base + SPICC_INTREG);  in meson_spicc_transfer_one()
646 	if (!wait_for_completion_timeout(&spicc->done, msecs_to_jiffies(timeout)))  in meson_spicc_transfer_one()
655 	struct meson_spicc_device *spicc = spi_controller_get_devdata(host);  in meson_spicc_prepare_message()  local
657 	u32 conf = readl_relaxed(spicc->base + SPICC_CONREG) & SPICC_DATARATE_MASK;  in meson_spicc_prepare_message()
660 	spicc->message = message;  in meson_spicc_prepare_message()
674 	if (!spicc->data->has_oen) {  in meson_spicc_prepare_message()
676 			if (spicc->pins_idle_high)  in meson_spicc_prepare_message()
677 				pinctrl_select_state(spicc->pinctrl, spicc->pins_idle_high);  in meson_spicc_prepare_message()
679 			if (spicc->pins_idle_low)  in meson_spicc_prepare_message()
680 				pinctrl_select_state(spicc->pinctrl, spicc->pins_idle_low);  in meson_spicc_prepare_message()
707 	writel_relaxed(conf, spicc->base + SPICC_CONREG);  in meson_spicc_prepare_message()
710 	writel_relaxed(0, spicc->base + SPICC_PERIODREG);  in meson_spicc_prepare_message()
714 			    spicc->base + SPICC_TESTREG);  in meson_spicc_prepare_message()
721 	struct meson_spicc_device *spicc = spi_controller_get_devdata(host);  in meson_spicc_unprepare_transfer()  local
722 	u32 conf = readl_relaxed(spicc->base + SPICC_CONREG) & SPICC_DATARATE_MASK;  in meson_spicc_unprepare_transfer()
725 	writel(0, spicc->base + SPICC_INTREG);  in meson_spicc_unprepare_transfer()
727 	device_reset_optional(&spicc->pdev->dev);  in meson_spicc_unprepare_transfer()
730 	writel_relaxed(conf, spicc->base + SPICC_CONREG);  in meson_spicc_unprepare_transfer()
732 	if (!spicc->data->has_oen)  in meson_spicc_unprepare_transfer()
733 		pinctrl_select_default_state(&spicc->pdev->dev);  in meson_spicc_unprepare_transfer()
791 	struct meson_spicc_device *spicc = pow2_clk_to_spicc(divider);  in meson_spicc_pow2_recalc_rate()  local
793 	if (!spicc->host->cur_msg)  in meson_spicc_pow2_recalc_rate()
803 	struct meson_spicc_device *spicc = pow2_clk_to_spicc(divider);  in meson_spicc_pow2_determine_rate()  local
805 	if (!spicc->host->cur_msg)  in meson_spicc_pow2_determine_rate()
815 	struct meson_spicc_device *spicc = pow2_clk_to_spicc(divider);  in meson_spicc_pow2_set_rate()  local
817 	if (!spicc->host->cur_msg)  in meson_spicc_pow2_set_rate()
829 static int meson_spicc_pow2_clk_init(struct meson_spicc_device *spicc)  in meson_spicc_pow2_clk_init()  argument
831 	struct device *dev = &spicc->pdev->dev;  in meson_spicc_pow2_clk_init()
852 	if (spicc->data->has_pclk) {  in meson_spicc_pow2_clk_init()
854 		parent_data[0].hw = __clk_get_hw(spicc->pclk);  in meson_spicc_pow2_clk_init()
857 		parent_data[0].hw = __clk_get_hw(spicc->core);  in meson_spicc_pow2_clk_init()
880 	spicc->pow2_div.shift = 16;  in meson_spicc_pow2_clk_init()
881 	spicc->pow2_div.width = 3;  in meson_spicc_pow2_clk_init()
882 	spicc->pow2_div.flags = CLK_DIVIDER_POWER_OF_TWO;  in meson_spicc_pow2_clk_init()
883 	spicc->pow2_div.reg = spicc->base + SPICC_CONREG;  in meson_spicc_pow2_clk_init()
884 	spicc->pow2_div.hw.init = &init;  in meson_spicc_pow2_clk_init()
886 	spicc->clk = devm_clk_register(dev, &spicc->pow2_div.hw);  in meson_spicc_pow2_clk_init()
887 	if (WARN_ON(IS_ERR(spicc->clk)))  in meson_spicc_pow2_clk_init()
888 		return PTR_ERR(spicc->clk);  in meson_spicc_pow2_clk_init()
893 static int meson_spicc_enh_clk_init(struct meson_spicc_device *spicc)  in meson_spicc_enh_clk_init()  argument
895 	struct device *dev = &spicc->pdev->dev;  in meson_spicc_enh_clk_init()
918 	if (spicc->data->has_pclk) {  in meson_spicc_enh_clk_init()
920 		parent_data[0].hw = __clk_get_hw(spicc->pclk);  in meson_spicc_enh_clk_init()
923 		parent_data[0].hw = __clk_get_hw(spicc->core);  in meson_spicc_enh_clk_init()
948 	enh_div->reg = spicc->base + SPICC_ENH_CTL0;  in meson_spicc_enh_clk_init()
962 	parent_data[0].hw = &spicc->pow2_div.hw;  in meson_spicc_enh_clk_init()
969 	mux->reg = spicc->base + SPICC_ENH_CTL0;  in meson_spicc_enh_clk_init()
972 	spicc->clk = devm_clk_register(dev, &mux->hw);  in meson_spicc_enh_clk_init()
973 	if (WARN_ON(IS_ERR(spicc->clk)))  in meson_spicc_enh_clk_init()
974 		return PTR_ERR(spicc->clk);  in meson_spicc_enh_clk_init()
982 	struct meson_spicc_device *spicc;  in meson_spicc_probe()  local
985 	host = spi_alloc_host(&pdev->dev, sizeof(*spicc));  in meson_spicc_probe()
990 	spicc = spi_controller_get_devdata(host);  in meson_spicc_probe()
991 	spicc->host = host;  in meson_spicc_probe()
993 	spicc->data = of_device_get_match_data(&pdev->dev);  in meson_spicc_probe()
994 	if (!spicc->data) {  in meson_spicc_probe()
1000 	spicc->pdev = pdev;  in meson_spicc_probe()
1001 	platform_set_drvdata(pdev, spicc);  in meson_spicc_probe()
1003 	init_completion(&spicc->done);  in meson_spicc_probe()
1005 	spicc->base = devm_platform_ioremap_resource(pdev, 0);  in meson_spicc_probe()
1006 	if (IS_ERR(spicc->base)) {  in meson_spicc_probe()
1008 		ret = PTR_ERR(spicc->base);  in meson_spicc_probe()
1014 		       spicc->base + SPICC_CONREG);  in meson_spicc_probe()
1017 	writel_relaxed(0, spicc->base + SPICC_INTREG);  in meson_spicc_probe()
1026 			       0, NULL, spicc);  in meson_spicc_probe()
1032 	spicc->core = devm_clk_get_enabled(&pdev->dev, "core");  in meson_spicc_probe()
1033 	if (IS_ERR(spicc->core)) {  in meson_spicc_probe()
1035 		ret = PTR_ERR(spicc->core);  in meson_spicc_probe()
1039 	if (spicc->data->has_pclk) {  in meson_spicc_probe()
1040 		spicc->pclk = devm_clk_get_enabled(&pdev->dev, "pclk");  in meson_spicc_probe()
1041 		if (IS_ERR(spicc->pclk)) {  in meson_spicc_probe()
1043 			ret = PTR_ERR(spicc->pclk);  in meson_spicc_probe()
1048 	spicc->pinctrl = devm_pinctrl_get(&pdev->dev);  in meson_spicc_probe()
1049 	if (IS_ERR(spicc->pinctrl)) {  in meson_spicc_probe()
1050 		ret = PTR_ERR(spicc->pinctrl);  in meson_spicc_probe()
1060 	host->min_speed_hz = spicc->data->min_speed_hz;  in meson_spicc_probe()
1061 	host->max_speed_hz = spicc->data->max_speed_hz;  in meson_spicc_probe()
1069 	meson_spicc_oen_enable(spicc);  in meson_spicc_probe()
1071 	ret = meson_spicc_pow2_clk_init(spicc);  in meson_spicc_probe()
1077 	if (spicc->data->has_enhance_clk_div) {  in meson_spicc_probe()
1078 		ret = meson_spicc_enh_clk_init(spicc);  in meson_spicc_probe()
1101 	struct meson_spicc_device *spicc = platform_get_drvdata(pdev);  in meson_spicc_remove()  local
1104 	writel(0, spicc->base + SPICC_CONREG);  in meson_spicc_remove()
1106 	spi_controller_put(spicc->host);  in meson_spicc_remove()
1134 		.compatible	= "amlogic,meson-gx-spicc",
1138 		.compatible = "amlogic,meson-axg-spicc",
1142 		.compatible = "amlogic,meson-g12a-spicc",
1153 		.name = "meson-spicc",