1 // SPDX-License-Identifier: GPL-2.0-only
6 #include <linux/spi/spi.h>
12 /* SPI Flash Configuration Register */
17 /* SPI Flash Control and Status Register */
27 /* SPI Flash Data Register */
30 #define REG(x)		(rtspi->base + x)
33 static void rt_set_cs(struct spi_device *spi, bool active)  in rt_set_cs()  argument
35 	struct rtspi *rtspi = spi_controller_get_devdata(spi->controller);  in rt_set_cs()
93 static int transfer_one(struct spi_controller *ctrl, struct spi_device *spi,  in transfer_one()  argument
101 	tx_buf = xfer->tx_buf;  in transfer_one()
102 	rx_buf = xfer->rx_buf;  in transfer_one()
103 	cnt = xfer->len;  in transfer_one()
108 			cnt -= 4;  in transfer_one()
113 			cnt--;  in transfer_one()
119 			cnt -= 4;  in transfer_one()
124 			cnt--;  in transfer_one()
137 	/* Turn on big-endian byte ordering */  in init_hw()
156 	ctrl = devm_spi_alloc_host(&pdev->dev, sizeof(*rtspi));  in realtek_rtl_spi_probe()
158 		dev_err(&pdev->dev, "Error allocating SPI controller\n");  in realtek_rtl_spi_probe()
159 		return -ENOMEM;  in realtek_rtl_spi_probe()
164 	rtspi->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);  in realtek_rtl_spi_probe()
165 	if (IS_ERR(rtspi->base)) {  in realtek_rtl_spi_probe()
166 		dev_err(&pdev->dev, "Could not map SPI register address");  in realtek_rtl_spi_probe()
167 		return -ENOMEM;  in realtek_rtl_spi_probe()
172 	ctrl->dev.of_node = pdev->dev.of_node;  in realtek_rtl_spi_probe()
173 	ctrl->flags = SPI_CONTROLLER_HALF_DUPLEX;  in realtek_rtl_spi_probe()
174 	ctrl->set_cs = rt_set_cs;  in realtek_rtl_spi_probe()
175 	ctrl->transfer_one = transfer_one;  in realtek_rtl_spi_probe()
177 	err = devm_spi_register_controller(&pdev->dev, ctrl);  in realtek_rtl_spi_probe()
179 		dev_err(&pdev->dev, "Could not register SPI controller\n");  in realtek_rtl_spi_probe()
180 		return -ENODEV;  in realtek_rtl_spi_probe()
188 	{ .compatible = "realtek,rtl8380-spi" },
189 	{ .compatible = "realtek,rtl8382-spi" },
190 	{ .compatible = "realtek,rtl8391-spi" },
191 	{ .compatible = "realtek,rtl8392-spi" },
192 	{ .compatible = "realtek,rtl8393-spi" },
200 		.name = "realtek-rtl-spi",
209 MODULE_DESCRIPTION("Realtek RTL SPI driver");