Lines Matching +full:spi +full:- +full:3 +full:wire

1 // SPDX-License-Identifier: GPL-2.0+
3  * LPC32xx SSP interface (SPI mode)
6  * Written-by: Albert ARIBAUD <albert.aribaud@3adev.fr>
13 #include <spi.h>
38 /* lpc32xx spi slave */
59 		pr_err("3-wire mode not supported");  in spi_setup_slave()
79 	lslave->regs = (struct ssp_regs *)SSP0_BASE;  in spi_setup_slave()
82 	 * 8 bit frame, SPI fmt, 500kbps -> clock divider is 26.  in spi_setup_slave()
86 	writel(0x7, &lslave->regs->cr0); /* 8-bit chunks, SPI, 1 clk/bit */  in spi_setup_slave()
87 	writel(26, &lslave->regs->cpsr); /* SSP clock = HCLK/26 = 500kbps */  in spi_setup_slave()
88 	writel(0, &lslave->regs->imsc); /* do not raise any interrupts */  in spi_setup_slave()
89 	writel(0, &lslave->regs->icr); /* clear any pending interrupt */  in spi_setup_slave()
90 	writel(0, &lslave->regs->dmacr); /* do not do DMAs */  in spi_setup_slave()
91 	writel(SSP_CR1_SSP_ENABLE, &lslave->regs->cr1); /* enable SSP0 */  in spi_setup_slave()
92 	return &lslave->slave;  in spi_setup_slave()
113 	int bytelen = bitlen >> 3;  in spi_xfer()
120 		int status = readl(&lslave->regs->sr);  in spi_xfer()
122 			writel(((u8 *)dout)[idx_out++], &lslave->regs->data);  in spi_xfer()
124 			((u8 *)din)[idx_in++] = readl(&lslave->regs->data);  in spi_xfer()
126 			return -1;  in spi_xfer()