On 19:16 Wed 05 Aug , Albin Tonnerre wrote:
This chip is used in a number of boards manufactured by Calao-Systems which should be supported soon. This driver provides the necessary spi_read and spi_write functions necessary to communicate with the chip.
Signed-off-by: Albin Tonnerre albin.tonnerre@free-electrons.com
drivers/spi/Makefile | 1 + drivers/spi/eeprom_m95xxx.c | 115 +++++++++++++++++++++++++++++++++++++++++++
not sure it's the right place drivers mtd will better IMHO as in drivers/spi it will more for spi host drivers and not eeprom
2 files changed, 116 insertions(+), 0 deletions(-) create mode 100644 drivers/spi/eeprom_m95xxx.c
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index a9f67a0..35c9e02 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -33,6 +33,7 @@ COBJS-$(CONFIG_MPC52XX_SPI) += mpc52xx_spi.o COBJS-$(CONFIG_MPC8XXX_SPI) += mpc8xxx_spi.o COBJS-$(CONFIG_MXC_SPI) += mxc_spi.o COBJS-$(CONFIG_SOFT_SPI) += soft_spi.o +COBJS-$(CONFIG_M95XXX_SPI) += eeprom_m95xxx.o
COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/spi/eeprom_m95xxx.c b/drivers/spi/eeprom_m95xxx.c new file mode 100644 index 0000000..9298c9f --- /dev/null +++ b/drivers/spi/eeprom_m95xxx.c @@ -0,0 +1,115 @@ +/*
- Copyright (C) 2009
- Albin Tonnerre, Free Electrons albin.tonnerre@free-electrons.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 <spi.h>
+#define SPI_EEPROM_WREN 0x06 +#define SPI_EEPROM_RDSR 0x05 +#define SPI_EEPROM_READ 0x03 +#define SPI_EEPROM_WRITE 0x02
+#ifndef CONFIG_DEFAULT_SPI_BUS +#define CONFIG_DEFAULT_SPI_BUS 0 +#endif
+#ifndef CONFIG_DEFAULT_SPI_MODE +#define CONFIG_DEFAULT_SPI_MODE SPI_MODE_0 +#endif
+ssize_t spi_read (uchar *addr, int alen, uchar *buffer, int len) +{
- struct spi_slave *slave;
- u8 cmd = SPI_EEPROM_READ;
- slave = spi_setup_slave(CONFIG_DEFAULT_SPI_BUS, 1, 1000000,
CONFIG_DEFAULT_SPI_MODE);- spi_claim_bus(slave);
- /* command */
- if(spi_xfer(slave, 8, &cmd, NULL, SPI_XFER_BEGIN))
return -1;- /* if alen == 3, addr[0] is the block number, we never use it here. All we
* need are the lower 16 bits*/
please use the syle of comment /* * */
- if (alen == 3)
addr++;- /* address, and data */
- if(spi_xfer(slave, 16, addr, NULL, 0))
return -1;- if(spi_xfer(slave, 8*len, NULL, buffer, SPI_XFER_END))
please add a space before and after the '*'
return -1;- spi_release_bus(slave);
- spi_free_slave(slave);
- return len;
+}
+ssize_t spi_write (uchar *addr, int alen, uchar *buffer, int len) +{
- struct spi_slave *slave;
- int i;
- char buf[3];
- slave = spi_setup_slave(CONFIG_DEFAULT_SPI_BUS, 1, 1000000,
CONFIG_DEFAULT_SPI_MODE);- spi_claim_bus(slave);
- buf[0] = SPI_EEPROM_WREN;
- if(spi_xfer(slave, 8, buf, NULL, SPI_XFER_BEGIN | SPI_XFER_END))
return -1;- buf[0] = SPI_EEPROM_WRITE;
- /* As for reading, drop addr[0] if alen is 3 */
- if (alen == 3) {
alen--;addr++;- }
- memcpy(buf+1, addr, alen);
please add a space before and after the '+'
- /* command + addr, then data */
- if(spi_xfer(slave, 24, buf, NULL, SPI_XFER_BEGIN))
return -1;- if(spi_xfer(slave, len*8, buffer, NULL, SPI_XFER_END))
please add a space before and after the '*'
return -1;- for (i = 0; i < 1000; i++) {
why 1000?
buf[0] = SPI_EEPROM_RDSR;buf[1] = 0;spi_xfer(slave, 16, buf, buf, SPI_XFER_BEGIN | SPI_XFER_END);
Best Regards, J.