2  * scf0403.c -- support for DataImage SCF0403 LCD
12  * U-Boot port: Nikita Kiryanov <nikita@compulab.co.il>
14  * SPDX-License-Identifier:	GPL-2.0+
18 #include <asm/gpio.h>
19 #include <spi.h>
33 	struct spi_slave *spi;  member
138 static void scf0403_gpio_reset(unsigned int gpio)  in scf0403_gpio_reset()  argument
140 	if (!gpio_is_valid(gpio))  in scf0403_gpio_reset()
143 	gpio_set_value(gpio, 1);  in scf0403_gpio_reset()
145 	gpio_set_value(gpio, 0);  in scf0403_gpio_reset()
147 	gpio_set_value(gpio, 1);  in scf0403_gpio_reset()
151 static int scf0403_spi_read_rddid(struct spi_slave *spi, u32 *rddid)  in scf0403_spi_read_rddid()  argument
158 	error = spi_set_wordlen(spi, 9);  in scf0403_spi_read_rddid()
163 	error = spi_xfer(spi, 9, &cmd, NULL, SPI_XFER_ONCE);  in scf0403_spi_read_rddid()
170 	 * According to the datasheet - first parameter is the dummy data.  in scf0403_spi_read_rddid()
172 	error = spi_xfer(spi, 9, NULL, &dummy_buf, SPI_XFER_ONCE);  in scf0403_spi_read_rddid()
176 	error = spi_set_wordlen(spi, 8);  in scf0403_spi_read_rddid()
181 	error = spi_xfer(spi, 8, NULL, &ids_buf, SPI_XFER_ONCE);  in scf0403_spi_read_rddid()
190 static int scf0403_spi_transfer(struct spi_slave *spi, struct scf0403_cmd *cmd)  in scf0403_spi_transfer()  argument
193 	u32 command = cmd->cmd;  in scf0403_spi_transfer()
196 	error = spi_set_wordlen(spi, 9);  in scf0403_spi_transfer()
200 	error = spi_xfer(spi, 9, &command, NULL, SPI_XFER_ONCE);  in scf0403_spi_transfer()
204 	for (i = 0; i < cmd->count; i++) {  in scf0403_spi_transfer()
205 		msg = (cmd->params[i] | 0x100);  in scf0403_spi_transfer()
206 		error = spi_xfer(spi, 9, &msg, NULL, SPI_XFER_ONCE);  in scf0403_spi_transfer()
219 	scf0403_gpio_reset(priv->reset_gpio);  in scf0403_lcd_init()
221 	for (i = 0; i < priv->seq_size; i++) {  in scf0403_lcd_init()
222 		if (scf0403_spi_transfer(priv->spi, &priv->init_seq[i].cmd) < 0)  in scf0403_lcd_init()
223 			puts("SPI transfer failed\n");  in scf0403_lcd_init()
225 		mdelay(priv->init_seq[i].delay_ms);  in scf0403_lcd_init()
229 static int scf0403_request_reset_gpio(unsigned gpio)  in scf0403_request_reset_gpio()  argument
231 	int err = gpio_request(gpio, "lcd reset");  in scf0403_request_reset_gpio()
236 	err = gpio_direction_output(gpio, 0);  in scf0403_request_reset_gpio()
238 		gpio_free(gpio);  in scf0403_request_reset_gpio()
250 			printf("Failed requesting reset GPIO%d: %d\n",  in scf0403_init()
257 	priv.spi = spi_setup_slave(3, 0, 1000000, SPI_MODE_0);  in scf0403_init()
258 	error = spi_claim_bus(priv.spi);  in scf0403_init()
265 	error = scf0403_spi_read_rddid(priv.spi, &priv.rddid);  in scf0403_init()
282 	scf0403_spi_transfer(priv.spi, &scf0403_cmd_dison);  in scf0403_init()
284 	scf0403_spi_transfer(priv.spi, &scf0403_cmd_slpout);  in scf0403_init()
285 	spi_release_bus(priv.spi);  in scf0403_init()
290 	spi_release_bus(priv.spi);  in scf0403_init()