From e8314035996a9118ac5948df2ff8a2f2161ed67a Mon Sep 17 00:00:00 2001 From: Jean-Christophe PLAGNIOL-VILLARD Date: Thu, 28 Aug 2008 12:31:51 +0200 Subject: soft_spi: move to drivers/spi Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD --- common/Makefile | 1 - common/soft_spi.c | 193 ------------------------------------------------- drivers/spi/Makefile | 3 +- drivers/spi/soft_spi.c | 193 +++++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 195 insertions(+), 195 deletions(-) delete mode 100644 common/soft_spi.c create mode 100644 drivers/spi/soft_spi.c diff --git a/common/Makefile b/common/Makefile index faeac86dc1..3e4829f475 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 25b589ad7c..0000000000 --- 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 -#include - -#include - -/*----------------------------------------------------------------------- - * 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); -} diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 4f7b679eeb..15e0f7a66d 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -25,9 +25,10 @@ include $(TOPDIR)/config.mk LIB := $(obj)libspi.a -COBJS-$(CONFIG_MPC8XXX_SPI) += mpc8xxx_spi.o COBJS-$(CONFIG_ATMEL_SPI) += atmel_spi.o +COBJS-$(CONFIG_MPC8XXX_SPI) += mpc8xxx_spi.o COBJS-$(CONFIG_MXC_SPI) += mxc_spi.o +COBJS-$(CONFIG_SOFT_SPI) += soft_spi.o COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/spi/soft_spi.c b/drivers/spi/soft_spi.c new file mode 100644 index 0000000000..25b589ad7c --- /dev/null +++ b/drivers/spi/soft_spi.c @@ -0,0 +1,193 @@ +/* + * (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 +#include + +#include + +/*----------------------------------------------------------------------- + * 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); +} -- cgit v1.2.1