diff options
Diffstat (limited to 'common')
| -rw-r--r-- | common/Makefile | 1 | ||||
| -rw-r--r-- | common/soft_spi.c | 193 |
2 files changed, 0 insertions, 194 deletions
diff --git a/common/Makefile b/common/Makefile index faeac86..3e4829f 100644 --- a/common/Makefile +++ b/common/Makefile @@ -137,7 +137,6 @@ COBJS-$(CONFIG_BITBANGMII) += miiphybb.o COBJS-y += miiphyutil.o COBJS-y += s_record.o COBJS-y += serial.o -COBJS-$(CONFIG_SOFT_SPI) += soft_spi.o ifdef CONFIG_CMD_USB COBJS-y += usb.o COBJS-$(CONFIG_USB_STORAGE) += usb_storage.o diff --git a/common/soft_spi.c b/common/soft_spi.c deleted file mode 100644 index 25b589a..0000000 --- a/common/soft_spi.c +++ /dev/null @@ -1,193 +0,0 @@ -/* - * (C) Copyright 2002 - * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com. - * - * Influenced by code from: - * Wolfgang Denk, DENX Software Engineering, wd@denx.de. - * - * 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 <spi.h> - -#include <malloc.h> - -/*----------------------------------------------------------------------- - * Definitions - */ - -#ifdef DEBUG_SPI -#define PRINTD(fmt,args...) printf (fmt ,##args) -#else -#define PRINTD(fmt,args...) -#endif - -struct soft_spi_slave { - struct spi_slave slave; - unsigned int mode; -}; - -static inline struct soft_spi_slave *to_soft_spi(struct spi_slave *slave) -{ - return container_of(slave, struct soft_spi_slave, slave); -} - -/*=====================================================================*/ -/* Public Functions */ -/*=====================================================================*/ - -/*----------------------------------------------------------------------- - * Initialization - */ -void spi_init (void) -{ -#ifdef SPI_INIT - volatile immap_t *immr = (immap_t *)CFG_IMMR; - - SPI_INIT; -#endif -} - -struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, - unsigned int max_hz, unsigned int mode) -{ - struct soft_spi_slave *ss; - - if (!spi_cs_is_valid(bus, cs)) - return NULL; - - ss = malloc(sizeof(struct soft_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 */ - - return &ss->slave; -} - -void spi_free_slave(struct spi_slave *slave) -{ - struct soft_spi_slave *ss = to_soft_spi(slave); - - free(ss); -} - -int spi_claim_bus(struct spi_slave *slave) -{ -#ifdef CFG_IMMR - volatile immap_t *immr = (immap_t *)CFG_IMMR; -#endif - struct soft_spi_slave *ss = to_soft_spi(slave); - - /* - * Make sure the SPI clock is in idle state as defined for - * this slave. - */ - if (ss->mode & SPI_CPOL) - SPI_SCL(1); - else - SPI_SCL(0); - - return 0; -} - -void spi_release_bus(struct spi_slave *slave) -{ - /* Nothing to do */ -} - -/*----------------------------------------------------------------------- - * SPI transfer - * - * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks - * "bitlen" bits in the SPI MISO port. That's just the way SPI works. - * - * The source of the outgoing bits is the "dout" parameter and the - * destination of the input bits is the "din" parameter. Note that "dout" - * and "din" can point to the same memory location, in which case the - * input data overwrites the output data (since both are buffered by - * temporary variables, this is OK). - */ -int spi_xfer(struct spi_slave *slave, unsigned int bitlen, - const void *dout, void *din, unsigned long flags) -{ -#ifdef CFG_IMMR - volatile immap_t *immr = (immap_t *)CFG_IMMR; -#endif - struct soft_spi_slave *ss = to_soft_spi(slave); - uchar tmpdin = 0; - uchar tmpdout = 0; - const u8 *txd = dout; - u8 *rxd = din; - int cpol = ss->mode & SPI_CPOL; - int cpha = ss->mode & SPI_CPHA; - unsigned int j; - - PRINTD("spi_xfer: slave %u:%u dout %08X din %08X bitlen %u\n", - slave->bus, slave->cs, *(uint *)txd, *(uint *)rxd, bitlen); - - if (flags & SPI_XFER_BEGIN) - spi_cs_activate(slave); - - for(j = 0; j < bitlen; j++) { - /* - * Check if it is time to work on a new byte. - */ - if((j % 8) == 0) { - tmpdout = *txd++; - if(j != 0) { - *rxd++ = tmpdin; - } - tmpdin = 0; - } - - if (!cpha) - SPI_SCL(!cpol); - SPI_SDA(tmpdout & 0x80); - SPI_DELAY; - if (cpha) - SPI_SCL(!cpol); - else - SPI_SCL(cpol); - tmpdin <<= 1; - tmpdin |= SPI_READ; - tmpdout <<= 1; - SPI_DELAY; - if (cpha) - SPI_SCL(cpol); - } - /* - * If the number of bits isn't a multiple of 8, shift the last - * bits over to left-justify them. Then store the last byte - * read in. - */ - if((bitlen % 8) != 0) - tmpdin <<= 8 - (bitlen % 8); - *rxd++ = tmpdin; - - if (flags & SPI_XFER_END) - spi_cs_deactivate(slave); - - return(0); -} |