5  * SPDX-License-Identifier:	GPL-2.0+
11 #include <spi.h>
18 #define SPI_MODE_REV	(0x80000000 >> 5)	/* Reverse mode - MSB first */
27 	struct spi_slave *slave;  in spi_setup_slave()  local
32 	slave = spi_alloc_slave_base(bus, cs);  in spi_setup_slave()
33 	if (!slave)  in spi_setup_slave()
41 	return slave;  in spi_setup_slave()
44 void spi_free_slave(struct spi_slave *slave)  in spi_free_slave()  argument
46 	free(slave);  in spi_free_slave()
51 	volatile spi8xxx_t *spi = &((immap_t *) (CONFIG_SYS_IMMR))->spi;  in spi_init()  local
54 	 * SPI pins on the MPC83xx are not muxed, so all we do is initialize  in spi_init()
57 	spi->mode = SPI_MODE_REV | SPI_MODE_MS | SPI_MODE_EN;  in spi_init()
58 	spi->mode = (spi->mode & 0xfff0ffff) | BIT(16); /* Use SYSCLK / 8  in spi_init()
60 	spi->event = 0xffffffff;	/* Clear all SPI events */  in spi_init()
61 	spi->mask = 0x00000000;	/* Mask  all SPI interrupts */  in spi_init()
62 	spi->com = 0;		/* LST bit doesn't do anything, so disregard */  in spi_init()
65 int spi_claim_bus(struct spi_slave *slave)  in spi_claim_bus()  argument
70 void spi_release_bus(struct spi_slave *slave)  in spi_release_bus()  argument
75 int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,  in spi_xfer()  argument
78 	volatile spi8xxx_t *spi = &((immap_t *) (CONFIG_SYS_IMMR))->spi;  in spi_xfer()  local
84 	debug("spi_xfer: slave %u:%u dout %08X din %08X bitlen %u\n",  in spi_xfer()
85 	      slave->bus, slave->cs, *(uint *) dout, *(uint *) din, bitlen);  in spi_xfer()
88 		spi_cs_activate(slave);  in spi_xfer()
90 	spi->event = 0xffffffff;	/* Clear all SPI events */  in spi_xfer()
92 	/* handle data in 32-bit chunks */  in spi_xfer()
93 	while (numBlks--) {  in spi_xfer()
97 		/* Shift data so it's msb-justified */  in spi_xfer()
98 		tmpdout = *(u32 *) dout >> (32 - charSize);  in spi_xfer()
104 		 * 4 < len <= 16          len - 1  in spi_xfer()
108 		spi->mode &= ~SPI_MODE_EN;  in spi_xfer()
112 				spi->mode = (spi->mode & 0xff0fffff) |  in spi_xfer()
115 				spi->mode = (spi->mode & 0xff0fffff) |  in spi_xfer()
116 					    ((bitlen - 1) << 20);  in spi_xfer()
118 			spi->mode = (spi->mode & 0xff0fffff);  in spi_xfer()
120 			bitlen -= 32;  in spi_xfer()
124 		spi->mode |= SPI_MODE_EN;  in spi_xfer()
126 		spi->tx = tmpdout;	/* Write the data out */  in spi_xfer()
130 		 * Wait for SPI transmit to get out  in spi_xfer()
135 			event = spi->event;  in spi_xfer()
137 				tmpdin = spi->rx;  in spi_xfer()
138 				spi->event |= SPI_EV_NE;  in spi_xfer()
141 				*(u32 *) din = (tmpdin << (32 - charSize));  in spi_xfer()
157 			puts("*** spi_xfer: Time out during SPI transfer");  in spi_xfer()
163 		spi_cs_deactivate(slave);  in spi_xfer()