2  * SPI controller driver for the Atheros AR71XX/AR724X/AR913X SoCs
6  * This driver has been based on the spi-gpio.c:
23 #include <linux/spi/spi.h>
24 #include <linux/spi/spi_bitbang.h>
31 #define DRV_NAME	"ath79-spi"
50 static inline struct ath79_spi *ath79_spidev_to_sp(struct spi_device *spi)  in ath79_spidev_to_sp()  argument
52 	return spi_master_get_devdata(spi->master);  in ath79_spidev_to_sp()
55 static void ath79_spi_chipselect(struct spi_device *spi, int is_active)  in ath79_spi_chipselect()  argument
57 	struct ath79_spi *sp = ath79_spidev_to_sp(spi);  in ath79_spi_chipselect()
58 	int cs_high = (spi->mode & SPI_CS_HIGH) ? is_active : !is_active;  in ath79_spi_chipselect()
62 		if (spi->mode & SPI_CPOL)  in ath79_spi_chipselect()
70 	if (spi->chip_select) {  in ath79_spi_chipselect()
71 		struct ath79_spi_controller_data *cdata = spi->controller_data;  in ath79_spi_chipselect()
73 		/* SPI is normally active-low */  in ath79_spi_chipselect()
86 static int ath79_spi_setup_cs(struct spi_device *spi)  in ath79_spi_setup_cs()  argument
88 	struct ath79_spi *sp = ath79_spidev_to_sp(spi);  in ath79_spi_setup_cs()
91 	cdata = spi->controller_data;  in ath79_spi_setup_cs()
92 	if (spi->chip_select && !cdata)  in ath79_spi_setup_cs()
105 	if (spi->chip_select) {  in ath79_spi_setup_cs()
108 		status = gpio_request(cdata->gpio, dev_name(&spi->dev));  in ath79_spi_setup_cs()
113 					       spi->mode & SPI_CS_HIGH);  in ath79_spi_setup_cs()
119 		if (spi->mode & SPI_CS_HIGH)  in ath79_spi_setup_cs()
129 static void ath79_spi_cleanup_cs(struct spi_device *spi)  in ath79_spi_cleanup_cs()  argument
131 	struct ath79_spi *sp = ath79_spidev_to_sp(spi);  in ath79_spi_cleanup_cs()
133 	if (spi->chip_select) {  in ath79_spi_cleanup_cs()
134 		struct ath79_spi_controller_data *cdata = spi->controller_data;  in ath79_spi_cleanup_cs()
144 static int ath79_spi_setup(struct spi_device *spi)  in ath79_spi_setup()  argument
148 	if (spi->bits_per_word > 32)  in ath79_spi_setup()
151 	if (!spi->controller_state) {  in ath79_spi_setup()
152 		status = ath79_spi_setup_cs(spi);  in ath79_spi_setup()
157 	status = spi_bitbang_setup(spi);  in ath79_spi_setup()
158 	if (status && !spi->controller_state)  in ath79_spi_setup()
159 		ath79_spi_cleanup_cs(spi);  in ath79_spi_setup()
164 static void ath79_spi_cleanup(struct spi_device *spi)  in ath79_spi_cleanup()  argument
166 	ath79_spi_cleanup_cs(spi);  in ath79_spi_cleanup()
167 	spi_bitbang_cleanup(spi);  in ath79_spi_cleanup()
170 static u32 ath79_spi_txrx_mode0(struct spi_device *spi, unsigned nsecs,  in ath79_spi_txrx_mode0()  argument
173 	struct ath79_spi *sp = ath79_spidev_to_sp(spi);  in ath79_spi_txrx_mode0()
205 		dev_err(&pdev->dev, "failed to allocate spi master\n");  in ath79_spi_probe()
279 MODULE_DESCRIPTION("SPI controller driver for Atheros AR71XX/AR724X/AR913X");