2  * Driver for Amlogic Meson SPI communication controller (SPICC)
26  * The Meson SPICC controller could support DMA based transfers, but is not
171 static void meson_spicc_oen_enable(struct meson_spicc_device *spicc)  in meson_spicc_oen_enable()  argument
175 	if (!spicc->data->has_oen)  in meson_spicc_oen_enable()
178 	conf = readl_relaxed(spicc->base + SPICC_ENH_CTL0) |  in meson_spicc_oen_enable()
181 	writel_relaxed(conf, spicc->base + SPICC_ENH_CTL0);  in meson_spicc_oen_enable()
184 static inline bool meson_spicc_txfull(struct meson_spicc_device *spicc)  in meson_spicc_txfull()  argument
187 			   readl_relaxed(spicc->base + SPICC_STATREG));  in meson_spicc_txfull()
190 static inline bool meson_spicc_rxready(struct meson_spicc_device *spicc)  in meson_spicc_rxready()  argument
193 			 readl_relaxed(spicc->base + SPICC_STATREG));  in meson_spicc_rxready()
196 static inline u32 meson_spicc_pull_data(struct meson_spicc_device *spicc)  in meson_spicc_pull_data()  argument
198 	unsigned int bytes = spicc->bytes_per_word;  in meson_spicc_pull_data()
204 		byte = *spicc->tx_buf++;  in meson_spicc_pull_data()
209 	spicc->tx_remain--;  in meson_spicc_pull_data()
213 static inline void meson_spicc_push_data(struct meson_spicc_device *spicc,  in meson_spicc_push_data()  argument
216 	unsigned int bytes = spicc->bytes_per_word;  in meson_spicc_push_data()
222 		*spicc->rx_buf++ = byte;  in meson_spicc_push_data()
226 	spicc->rx_remain--;  in meson_spicc_push_data()
229 static inline void meson_spicc_rx(struct meson_spicc_device *spicc)  in meson_spicc_rx()  argument
232 	while (spicc->rx_remain &&  in meson_spicc_rx()
233 	       meson_spicc_rxready(spicc))  in meson_spicc_rx()
234 		meson_spicc_push_data(spicc,  in meson_spicc_rx()
235 				readl_relaxed(spicc->base + SPICC_RXDATA));  in meson_spicc_rx()
238 static inline void meson_spicc_tx(struct meson_spicc_device *spicc)  in meson_spicc_tx()  argument
241 	while (spicc->tx_remain &&  in meson_spicc_tx()
242 	       !meson_spicc_txfull(spicc))  in meson_spicc_tx()
243 		writel_relaxed(meson_spicc_pull_data(spicc),  in meson_spicc_tx()
244 			       spicc->base + SPICC_TXDATA);  in meson_spicc_tx()
247 static inline void meson_spicc_setup_burst(struct meson_spicc_device *spicc)  in meson_spicc_setup_burst()  argument
251 				       spicc->xfer_remain /  in meson_spicc_setup_burst()
252 				       spicc->bytes_per_word,  in meson_spicc_setup_burst()
253 				       spicc->data->fifo_size);  in meson_spicc_setup_burst()
255 	spicc->tx_remain = burst_len;  in meson_spicc_setup_burst()
256 	spicc->rx_remain = burst_len;  in meson_spicc_setup_burst()
257 	spicc->xfer_remain -= burst_len * spicc->bytes_per_word;  in meson_spicc_setup_burst()
263 			spicc->base + SPICC_CONREG);  in meson_spicc_setup_burst()
266 	meson_spicc_tx(spicc);  in meson_spicc_setup_burst()
271 	struct meson_spicc_device *spicc = (void *) data;  in meson_spicc_irq()  local
273 	writel_bits_relaxed(SPICC_TC, SPICC_TC, spicc->base + SPICC_STATREG);  in meson_spicc_irq()
276 	meson_spicc_rx(spicc);  in meson_spicc_irq()
278 	if (!spicc->xfer_remain) {  in meson_spicc_irq()
280 		writel(0, spicc->base + SPICC_INTREG);  in meson_spicc_irq()
282 		spi_finalize_current_transfer(spicc->master);  in meson_spicc_irq()
288 	meson_spicc_setup_burst(spicc);  in meson_spicc_irq()
291 	writel_bits_relaxed(SPICC_XCH, SPICC_XCH, spicc->base + SPICC_CONREG);  in meson_spicc_irq()
296 static void meson_spicc_auto_io_delay(struct meson_spicc_device *spicc)  in meson_spicc_auto_io_delay()  argument
302 	if (spicc->data->has_enhance_clk_div) {  in meson_spicc_auto_io_delay()
304 				readl_relaxed(spicc->base + SPICC_ENH_CTL0));  in meson_spicc_auto_io_delay()
309 				readl_relaxed(spicc->base + SPICC_CONREG));  in meson_spicc_auto_io_delay()
316 	hz = clk_get_rate(spicc->clk);  in meson_spicc_auto_io_delay()
331 	conf = readl_relaxed(spicc->base + SPICC_TESTREG);  in meson_spicc_auto_io_delay()
336 	writel_relaxed(conf, spicc->base + SPICC_TESTREG);  in meson_spicc_auto_io_delay()
339 static void meson_spicc_setup_xfer(struct meson_spicc_device *spicc,  in meson_spicc_setup_xfer()  argument
345 	conf = conf_orig = readl_relaxed(spicc->base + SPICC_CONREG);  in meson_spicc_setup_xfer()
350 			   (spicc->bytes_per_word << 3) - 1);  in meson_spicc_setup_xfer()
354 		writel_relaxed(conf, spicc->base + SPICC_CONREG);  in meson_spicc_setup_xfer()
356 	clk_set_rate(spicc->clk, xfer->speed_hz);  in meson_spicc_setup_xfer()
358 	meson_spicc_auto_io_delay(spicc);  in meson_spicc_setup_xfer()
360 	writel_relaxed(0, spicc->base + SPICC_DMAREG);  in meson_spicc_setup_xfer()
363 static void meson_spicc_reset_fifo(struct meson_spicc_device *spicc)  in meson_spicc_reset_fifo()  argument
365 	if (spicc->data->has_oen)  in meson_spicc_reset_fifo()
368 				    spicc->base + SPICC_ENH_CTL0);  in meson_spicc_reset_fifo()
371 			    spicc->base + SPICC_TESTREG);  in meson_spicc_reset_fifo()
373 	while (meson_spicc_rxready(spicc))  in meson_spicc_reset_fifo()
374 		readl_relaxed(spicc->base + SPICC_RXDATA);  in meson_spicc_reset_fifo()
376 	if (spicc->data->has_oen)  in meson_spicc_reset_fifo()
378 				    spicc->base + SPICC_ENH_CTL0);  in meson_spicc_reset_fifo()
385 	struct meson_spicc_device *spicc = spi_master_get_devdata(master);  in meson_spicc_transfer_one()  local
388 	spicc->xfer = xfer;  in meson_spicc_transfer_one()
391 	spicc->tx_buf = (u8 *)xfer->tx_buf;  in meson_spicc_transfer_one()
392 	spicc->rx_buf = (u8 *)xfer->rx_buf;  in meson_spicc_transfer_one()
393 	spicc->xfer_remain = xfer->len;  in meson_spicc_transfer_one()
396 	spicc->bytes_per_word =  in meson_spicc_transfer_one()
397 	   DIV_ROUND_UP(spicc->xfer->bits_per_word, 8);  in meson_spicc_transfer_one()
399 	if (xfer->len % spicc->bytes_per_word)  in meson_spicc_transfer_one()
403 	meson_spicc_setup_xfer(spicc, xfer);  in meson_spicc_transfer_one()
405 	meson_spicc_reset_fifo(spicc);  in meson_spicc_transfer_one()
408 	meson_spicc_setup_burst(spicc);  in meson_spicc_transfer_one()
411 	writel_bits_relaxed(SPICC_XCH, SPICC_XCH, spicc->base + SPICC_CONREG);  in meson_spicc_transfer_one()
414 	writel_relaxed(SPICC_TC_EN, spicc->base + SPICC_INTREG);  in meson_spicc_transfer_one()
422 	struct meson_spicc_device *spicc = spi_master_get_devdata(master);  in meson_spicc_prepare_message()  local
427 	spicc->message = message;  in meson_spicc_prepare_message()
466 	writel_relaxed(conf, spicc->base + SPICC_CONREG);  in meson_spicc_prepare_message()
469 	writel_relaxed(0, spicc->base + SPICC_PERIODREG);  in meson_spicc_prepare_message()
471 	writel_bits_relaxed(SPICC_LBC_W1, 0, spicc->base + SPICC_TESTREG);  in meson_spicc_prepare_message()
478 	struct meson_spicc_device *spicc = spi_master_get_devdata(master);  in meson_spicc_unprepare_transfer()  local
481 	writel(0, spicc->base + SPICC_INTREG);  in meson_spicc_unprepare_transfer()
483 	device_reset_optional(&spicc->pdev->dev);  in meson_spicc_unprepare_transfer()
523 static int meson_spicc_clk_init(struct meson_spicc_device *spicc)  in meson_spicc_clk_init()  argument
525 	struct device *dev = &spicc->pdev->dev;  in meson_spicc_clk_init()
549 	if (spicc->data->has_pclk)  in meson_spicc_clk_init()
550 		parent_data[0].hw = __clk_get_hw(spicc->pclk);  in meson_spicc_clk_init()
552 		parent_data[0].hw = __clk_get_hw(spicc->core);  in meson_spicc_clk_init()
577 	pow2_div->reg = spicc->base + SPICC_CONREG;  in meson_spicc_clk_init()
584 	if (!spicc->data->has_enhance_clk_div) {  in meson_spicc_clk_init()
585 		spicc->clk = clk;  in meson_spicc_clk_init()
599 	if (spicc->data->has_pclk)  in meson_spicc_clk_init()
600 		parent_data[0].hw = __clk_get_hw(spicc->pclk);  in meson_spicc_clk_init()
602 		parent_data[0].hw = __clk_get_hw(spicc->core);  in meson_spicc_clk_init()
626 	enh_div->reg = spicc->base + SPICC_ENH_CTL0;  in meson_spicc_clk_init()
647 	mux->reg = spicc->base + SPICC_ENH_CTL0;  in meson_spicc_clk_init()
650 	spicc->clk = devm_clk_register(dev, &mux->hw);  in meson_spicc_clk_init()
651 	if (WARN_ON(IS_ERR(spicc->clk)))  in meson_spicc_clk_init()
652 		return PTR_ERR(spicc->clk);  in meson_spicc_clk_init()
660 	struct meson_spicc_device *spicc;  in meson_spicc_probe()  local
663 	master = spi_alloc_master(&pdev->dev, sizeof(*spicc));  in meson_spicc_probe()
668 	spicc = spi_master_get_devdata(master);  in meson_spicc_probe()
669 	spicc->master = master;  in meson_spicc_probe()
671 	spicc->data = of_device_get_match_data(&pdev->dev);  in meson_spicc_probe()
672 	if (!spicc->data) {  in meson_spicc_probe()
678 	spicc->pdev = pdev;  in meson_spicc_probe()
679 	platform_set_drvdata(pdev, spicc);  in meson_spicc_probe()
681 	spicc->base = devm_platform_ioremap_resource(pdev, 0);  in meson_spicc_probe()
682 	if (IS_ERR(spicc->base)) {  in meson_spicc_probe()
684 		ret = PTR_ERR(spicc->base);  in meson_spicc_probe()
690 		       spicc->base + SPICC_CONREG);  in meson_spicc_probe()
693 	writel_relaxed(0, spicc->base + SPICC_INTREG);  in meson_spicc_probe()
697 			       0, NULL, spicc);  in meson_spicc_probe()
703 	spicc->core = devm_clk_get(&pdev->dev, "core");  in meson_spicc_probe()
704 	if (IS_ERR(spicc->core)) {  in meson_spicc_probe()
706 		ret = PTR_ERR(spicc->core);  in meson_spicc_probe()
710 	if (spicc->data->has_pclk) {  in meson_spicc_probe()
711 		spicc->pclk = devm_clk_get(&pdev->dev, "pclk");  in meson_spicc_probe()
712 		if (IS_ERR(spicc->pclk)) {  in meson_spicc_probe()
714 			ret = PTR_ERR(spicc->pclk);  in meson_spicc_probe()
719 	ret = clk_prepare_enable(spicc->core);  in meson_spicc_probe()
725 	ret = clk_prepare_enable(spicc->pclk);  in meson_spicc_probe()
741 	master->min_speed_hz = spicc->data->min_speed_hz;  in meson_spicc_probe()
742 	master->max_speed_hz = spicc->data->max_speed_hz;  in meson_spicc_probe()
750 	meson_spicc_oen_enable(spicc);  in meson_spicc_probe()
752 	ret = meson_spicc_clk_init(spicc);  in meson_spicc_probe()
767 	clk_disable_unprepare(spicc->pclk);  in meson_spicc_probe()
770 	clk_disable_unprepare(spicc->core);  in meson_spicc_probe()
780 	struct meson_spicc_device *spicc = platform_get_drvdata(pdev);  in meson_spicc_remove()  local
783 	writel(0, spicc->base + SPICC_CONREG);  in meson_spicc_remove()
785 	clk_disable_unprepare(spicc->core);  in meson_spicc_remove()
786 	clk_disable_unprepare(spicc->pclk);  in meson_spicc_remove()
788 	spi_master_put(spicc->master);  in meson_spicc_remove()
818 		.compatible	= "amlogic,meson-gx-spicc",
822 		.compatible = "amlogic,meson-axg-spicc",
826 		.compatible = "amlogic,meson-g12a-spicc",
837 		.name = "meson-spicc",