diff options
Diffstat (limited to 'package/boot/uboot-ar71xx/src/drivers/spi/ar71xx_spi.c')
| -rw-r--r-- | package/boot/uboot-ar71xx/src/drivers/spi/ar71xx_spi.c | 191 |
1 files changed, 0 insertions, 191 deletions
diff --git a/package/boot/uboot-ar71xx/src/drivers/spi/ar71xx_spi.c b/package/boot/uboot-ar71xx/src/drivers/spi/ar71xx_spi.c deleted file mode 100644 index bbe27b16ef..0000000000 --- a/package/boot/uboot-ar71xx/src/drivers/spi/ar71xx_spi.c +++ /dev/null @@ -1,191 +0,0 @@ -/* - * (C) Copyright 2010 - * Michael Kurz <michi.kurz@googlemail.com> - * - * See file CREDITS for list of people who contributed to this - * project. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of - * the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA - */ - -#include <common.h> -#include <malloc.h> -#include <spi.h> - -#include <asm/addrspace.h> -#include <asm/types.h> -#include <asm/ar71xx.h> - -/*----------------------------------------------------------------------- - * Definitions - */ - -#ifdef DEBUG_SPI -#define PRINTD(fmt,args...) printf (fmt ,##args) -#else -#define PRINTD(fmt,args...) -#endif - -struct ar71xx_spi_slave { - struct spi_slave slave; - unsigned int mode; -}; - -static inline struct ar71xx_spi_slave *to_ar71xx_spi(struct spi_slave *slave) -{ - return container_of(slave, struct ar71xx_spi_slave, slave); -} - -/*=====================================================================*/ -/* Public Functions */ -/*=====================================================================*/ - -/*----------------------------------------------------------------------- - * Initialization - */ - -void spi_init() -{ - PRINTD("ar71xx_spi: spi_init"); - - // Init SPI Hardware, disable remap, set clock - __raw_writel(0x43, KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_CTRL)); - - PRINTD(" ---> out\n"); -} - -struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, - unsigned int max_hz, unsigned int mode) -{ - struct ar71xx_spi_slave *ss; - - PRINTD("ar71xx_spi: spi_setup_slave"); - - if ((bus != 0) || (cs > 2)) - return NULL; - - ss = malloc(sizeof(struct ar71xx_spi_slave)); - if (!ss) - return NULL; - - ss->slave.bus = bus; - ss->slave.cs = cs; - ss->mode = mode; - - /* TODO: Use max_hz to limit the SCK rate */ - - PRINTD(" ---> out\n"); - - return &ss->slave; -} - -void spi_free_slave(struct spi_slave *slave) -{ - struct ar71xx_spi_slave *ss = to_ar71xx_spi(slave); - - free(ss); -} - -int spi_claim_bus(struct spi_slave *slave) -{ - - return 0; -} - -void spi_release_bus(struct spi_slave *slave) -{ - -} - -int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, - void *din, unsigned long flags) -{ - struct ar71xx_spi_slave *ss = to_ar71xx_spi(slave); - uint8_t *rx = din; - const uint8_t *tx = dout; - uint8_t curbyte, curbitlen, restbits; - uint32_t bytes = bitlen / 8; - uint32_t out; - uint32_t in; - - PRINTD("ar71xx_spi: spi_xfer: slave:%p bitlen:%08x dout:%p din:%p flags:%08x\n", slave, bitlen, dout, din, flags); - - if (flags & SPI_XFER_BEGIN) { - __raw_writel(SPI_FS_GPIO, KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_FS)); - __raw_writel(SPI_IOC_CS_ALL, KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_IOC)); - } - - restbits = (bitlen % 8); - if (restbits != 0) - bytes++; - - // enable chip select - out = SPI_IOC_CS_ALL & ~(SPI_IOC_CS(slave->cs)); - - while (bytes--) { - - curbyte = 0; - if (tx) { - curbyte = *tx++; - } - - if (restbits != 0) { - curbitlen = restbits; - curbyte <<= 8 - restbits; - } else { - curbitlen = 8; - } - - PRINTD("ar71xx_spi: sending: data:%02x length:%d\n", curbyte, curbitlen); - - /* clock starts at inactive polarity */ - for (curbyte <<= (8 - curbitlen); curbitlen; curbitlen--) { - - if (curbyte & (1 << 7)) - out |= SPI_IOC_DO; - else - out &= ~(SPI_IOC_DO); - - /* setup MSB (to slave) on trailing edge */ - __raw_writel(out, KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_IOC)); - - __raw_writel(out | SPI_IOC_CLK, KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_IOC)); - - curbyte <<= 1; - } - - in = __raw_readl(KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_RDS)); - PRINTD("ar71xx_spi: received:%02x\n", in); - - if (rx) { - if (restbits == 0) { - *rx++ = in; - } else { - *rx++ = (in << (8 - restbits)); - } - } - } - - if (flags & SPI_XFER_END) { - __raw_writel(SPI_IOC_CS(slave->cs), KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_IOC)); - __raw_writel(SPI_IOC_CS_ALL, KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_IOC)); - __raw_writel(0, KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_FS)); - } - - PRINTD(" ---> out\n"); - - return 0; -} |