drivers/spi/spi-sun4i.c

90 static inline u32 sun4i_spi_read(struct sun4i_spi *sspi, u32 reg)
92 	return readl(sspi->base_addr + reg);
95 static inline void sun4i_spi_write(struct sun4i_spi *sspi, u32 reg, u32 value)
97 	writel(value, sspi->base_addr + reg);
100 static inline u32 sun4i_spi_get_tx_fifo_count(struct sun4i_spi *sspi)
102 	u32 reg = sun4i_spi_read(sspi, SUN4I_FIFO_STA_REG);
109 static inline void sun4i_spi_enable_interrupt(struct sun4i_spi *sspi, u32 mask)
111 	u32 reg = sun4i_spi_read(sspi, SUN4I_INT_CTL_REG);
114 	sun4i_spi_write(sspi, SUN4I_INT_CTL_REG, reg);
117 static inline void sun4i_spi_disable_interrupt(struct sun4i_spi *sspi, u32 mask)
119 	u32 reg = sun4i_spi_read(sspi, SUN4I_INT_CTL_REG);
122 	sun4i_spi_write(sspi, SUN4I_INT_CTL_REG, reg);
125 static inline void sun4i_spi_drain_fifo(struct sun4i_spi *sspi, int len)
131 	reg = sun4i_spi_read(sspi, SUN4I_FIFO_STA_REG);
139 		byte = readb(sspi->base_addr + SUN4I_RXDATA_REG);
140 		if (sspi->rx_buf)
141 			*sspi->rx_buf++ = byte;
145 static inline void sun4i_spi_fill_fifo(struct sun4i_spi *sspi, int len)
151 	cnt = SUN4I_FIFO_DEPTH - sun4i_spi_get_tx_fifo_count(sspi);
153 	len = min3(len, (int)cnt, sspi->len);
156 		byte = sspi->tx_buf ? *sspi->tx_buf++ : 0;
157 		writeb(byte, sspi->base_addr + SUN4I_TXDATA_REG);
158 		sspi->len--;
164 	struct sun4i_spi *sspi = spi_controller_get_devdata(spi->controller);
167 	reg = sun4i_spi_read(sspi, SUN4I_CTL_REG);
196 	sun4i_spi_write(sspi, SUN4I_CTL_REG, reg);
208 	struct sun4i_spi *sspi = spi_controller_get_devdata(host);
223 	reinit_completion(&sspi->done);
224 	sspi->tx_buf = tfr->tx_buf;
225 	sspi->rx_buf = tfr->rx_buf;
226 	sspi->len = tfr->len;
229 	sun4i_spi_write(sspi, SUN4I_INT_STA_REG, ~0);
232 	reg = sun4i_spi_read(sspi, SUN4I_CTL_REG);
235 	sun4i_spi_write(sspi, SUN4I_CTL_REG,
262 	if (sspi->rx_buf)
270 	sun4i_spi_write(sspi, SUN4I_CTL_REG, reg);
273 	mclk_rate = clk_get_rate(sspi->mclk);
275 		clk_set_rate(sspi->mclk, 2 * tfr->speed_hz);
276 		mclk_rate = clk_get_rate(sspi->mclk);
304 	sun4i_spi_write(sspi, SUN4I_CLK_CTL_REG, reg);
307 	if (sspi->tx_buf)
311 	sun4i_spi_write(sspi, SUN4I_BURST_CNT_REG, SUN4I_BURST_CNT(tfr->len));
312 	sun4i_spi_write(sspi, SUN4I_XMIT_CNT_REG, SUN4I_XMIT_CNT(tx_len));
319 	sun4i_spi_fill_fifo(sspi, SUN4I_FIFO_DEPTH - 1);
322 	sun4i_spi_enable_interrupt(sspi, SUN4I_INT_CTL_TC |
326 		sun4i_spi_enable_interrupt(sspi, SUN4I_INT_CTL_TF_E34);
329 	reg = sun4i_spi_read(sspi, SUN4I_CTL_REG);
330 	sun4i_spi_write(sspi, SUN4I_CTL_REG, reg | SUN4I_CTL_XCH);
334 	time_left = wait_for_completion_timeout(&sspi->done,
348 	sun4i_spi_write(sspi, SUN4I_INT_CTL_REG, 0);
355 	struct sun4i_spi *sspi = dev_id;
356 	u32 status = sun4i_spi_read(sspi, SUN4I_INT_STA_REG);
360 		sun4i_spi_write(sspi, SUN4I_INT_STA_REG, SUN4I_INT_CTL_TC);
361 		sun4i_spi_drain_fifo(sspi, SUN4I_FIFO_DEPTH);
362 		complete(&sspi->done);
368 		sun4i_spi_drain_fifo(sspi, SUN4I_FIFO_DEPTH);
370 		sun4i_spi_write(sspi, SUN4I_INT_STA_REG, SUN4I_INT_CTL_RF_F34);
376 		sun4i_spi_fill_fifo(sspi, SUN4I_FIFO_DEPTH);
378 		if (!sspi->len)
380 			sun4i_spi_disable_interrupt(sspi, SUN4I_INT_CTL_TF_E34);
383 		sun4i_spi_write(sspi, SUN4I_INT_STA_REG, SUN4I_INT_CTL_TF_E34);
394 	struct sun4i_spi *sspi = spi_controller_get_devdata(host);
397 	ret = clk_prepare_enable(sspi->hclk);
403 	ret = clk_prepare_enable(sspi->mclk);
409 	sun4i_spi_write(sspi, SUN4I_CTL_REG,
415 	clk_disable_unprepare(sspi->hclk);
423 	struct sun4i_spi *sspi = spi_controller_get_devdata(host);
425 	clk_disable_unprepare(sspi->mclk);
426 	clk_disable_unprepare(sspi->hclk);
434 	struct sun4i_spi *sspi;
444 	sspi = spi_controller_get_devdata(host);
446 	sspi->base_addr = devm_platform_ioremap_resource(pdev, 0);
447 	if (IS_ERR(sspi->base_addr)) {
448 		ret = PTR_ERR(sspi->base_addr);
459 			       0, "sun4i-spi", sspi);
465 	sspi->host = host;
478 	sspi->hclk = devm_clk_get(&pdev->dev, "ahb");
479 	if (IS_ERR(sspi->hclk)) {
481 		ret = PTR_ERR(sspi->hclk);
485 	sspi->mclk = devm_clk_get(&pdev->dev, "mod");
486 	if (IS_ERR(sspi->mclk)) {
488 		ret = PTR_ERR(sspi->mclk);
492 	init_completion(&sspi->done);