2 // Loongson SPI Support
14 #include <linux/spi/spi.h>
16 #include "spi-loongson.h"
18 static inline void loongson_spi_write_reg(struct loongson_spi *spi, unsigned char reg,  in loongson_spi_write_reg()  argument
21 	writeb(data, spi->base + reg);  in loongson_spi_write_reg()
24 static inline char loongson_spi_read_reg(struct loongson_spi *spi, unsigned char reg)  in loongson_spi_read_reg()  argument
26 	return readb(spi->base + reg);  in loongson_spi_read_reg()
29 static void loongson_spi_set_cs(struct spi_device *spi, bool en)  in loongson_spi_set_cs()  argument
32 	unsigned char mask = (BIT(4) | BIT(0)) << spi_get_chipselect(spi, 0);  in loongson_spi_set_cs()
33 	unsigned char val = en ? mask :  (BIT(0) << spi_get_chipselect(spi, 0));  in loongson_spi_set_cs()
34 	struct loongson_spi *loongson_spi = spi_controller_get_devdata(spi->controller);  in loongson_spi_set_cs()
62 				  struct spi_device *spi)  in loongson_spi_set_mode()  argument
68 	if (spi->mode & SPI_CPOL)  in loongson_spi_set_mode()
70 	if (spi->mode & SPI_CPHA)  in loongson_spi_set_mode()
74 	loongson_spi->mode |= spi->mode;  in loongson_spi_set_mode()
78 				struct spi_device *spi, struct spi_transfer *t)  in loongson_spi_update_state()  argument
83 	if ((spi->mode ^ loongson_spi->mode) & SPI_MODE_X_MASK)  in loongson_spi_update_state()
84 		loongson_spi_set_mode(loongson_spi, spi);  in loongson_spi_update_state()
89 static int loongson_spi_setup(struct spi_device *spi)  in loongson_spi_setup()  argument
93 	loongson_spi = spi_controller_get_devdata(spi->controller);  in loongson_spi_setup()
94 	if (spi->bits_per_word % 8)  in loongson_spi_setup()
97 	if (spi_get_chipselect(spi, 0) >= spi->controller->num_chipselect)  in loongson_spi_setup()
101 	loongson_spi_set_cs(spi, true);  in loongson_spi_setup()
106 static int loongson_spi_write_read_8bit(struct spi_device *spi, const u8 **tx_buf,  in loongson_spi_write_read_8bit()  argument
110 	struct loongson_spi *loongson_spi = spi_controller_get_devdata(spi->controller);  in loongson_spi_write_read_8bit()
130 static int loongson_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer)  in loongson_spi_write_read()  argument
139 		ret = loongson_spi_write_read_8bit(spi, &tx, &rx, count);  in loongson_spi_write_read()
158 static int loongson_spi_transfer_one(struct spi_controller *ctrl, struct spi_device *spi,  in loongson_spi_transfer_one()  argument
161 	struct loongson_spi *loongson_spi = spi_controller_get_devdata(spi->controller);  in loongson_spi_transfer_one()
163 	loongson_spi_update_state(loongson_spi, spi, xfer);  in loongson_spi_transfer_one()
165 		return loongson_spi_write_read(spi, xfer);  in loongson_spi_transfer_one()
198 	struct loongson_spi *spi;  in loongson_spi_init_controller()  local
215 	spi = spi_controller_get_devdata(controller);  in loongson_spi_init_controller()
216 	spi->base = regs;  in loongson_spi_init_controller()
217 	spi->controller = controller;  in loongson_spi_init_controller()
223 	spi->clk_rate = clk_get_rate(clk);  in loongson_spi_init_controller()
224 	loongson_spi_reginit(spi);  in loongson_spi_init_controller()
226 	spi->mode = 0;  in loongson_spi_init_controller()
278 MODULE_DESCRIPTION("Loongson SPI core driver");