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u-boot/common/cmd_spi.c

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Initial revision
2002-10-01 01:07:28 +00:00
/*
* (C) Copyright 2002
* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
*
Add GPL-2.0+ SPDX-License-Identifier to source files Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
2013-07-08 07:37:19 +00:00
* SPDX-License-Identifier: GPL-2.0+
Initial revision
2002-10-01 01:07:28 +00:00
*/
/*
* SPI Read/Write Utilities
*/
#include <common.h>
#include <command.h>
dm: spi: Adjust cmd_spi to work with driver model Driver model uses a different way to find the SPI bus and slave from the numbered devices given on the command line. Adjust the code to suit. We use a generic SPI device, and attach it to the SPI bus before performing the transaction. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
2014-10-14 05:41:56 +00:00
#include <dm.h>
dm: spi: Move cmd device code into its own function In preparation for changing the error handling in this code for driver model, move it into its own function. Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Signed-off-by: Simon Glass <sjg@chromium.org>
2014-09-15 12:33:22 +00:00
#include <errno.h>
Initial revision
2002-10-01 01:07:28 +00:00
#include <spi.h>
* Patch by Andreas Oberritter, 09 Nov 2002: Change behaviour of NetLoop(): return -1 for errors, filesize otherwise; return code 0 is valid an means no file loaded - in this case the environment still gets updated! * Patches by Jon Diekema, 9 Nov 2002: - improve ADC/DAC clocking on the SACSng board to align the failing edges of LRCLK and SCLK - sbc8260 configuration tweaks - add status LED support for 82xx systems - wire sspi/sspo commands into command handler; improved error handlering - add timestamp support and alternate memory test to the SACSng configuration
2002-11-11 02:11:37 +00:00
/*-----------------------------------------------------------------------
* Definitions
*/
#ifndef MAX_SPI_BYTES
# define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */
#endif
Initial revision
2002-10-01 01:07:28 +00:00
SPI API improvements This patch gets rid of the spi_chipsel table and adds a handful of new functions that makes the SPI layer cleaner and more flexible. Instead of the spi_chipsel table, each board that wants to use SPI gets to implement three hooks: * spi_cs_activate(): Activates the chipselect for a given slave * spi_cs_deactivate(): Deactivates the chipselect for a given slave * spi_cs_is_valid(): Determines if the given bus/chipselect combination can be activated. Not all drivers may need those extra functions however. If that's the case, the board code may just leave them out (assuming they know what the driver needs) or rely on the linker to strip them out (assuming --gc-sections is being used.) To set up communication parameters for a given slave, the driver needs to call spi_setup_slave(). This returns a pointer to an opaque spi_slave struct which must be passed as a parameter to subsequent SPI calls. This struct can be freed by calling spi_free_slave(), but most driver probably don't want to do this. Before starting one or more SPI transfers, the driver must call spi_claim_bus() to gain exclusive access to the SPI bus and initialize the hardware. When all transfers are done, the driver must call spi_release_bus() to make the bus available to others, and possibly shut down the SPI controller hardware. spi_xfer() behaves mostly the same as before, but it now takes a spi_slave parameter instead of a spi_chipsel function pointer. It also got a new parameter, flags, which is used to specify chip select behaviour. This may be extended with other flags in the future. This patch has been build-tested on all powerpc and arm boards involved. I have not tested NIOS since I don't have a toolchain for it installed, so I expect some breakage there even though I've tried fixing up everything I could find by visual inspection. I have run-time tested this on AVR32 ATNGW100 using the atmel_spi and DataFlash drivers posted as a follow-up. I'd like some help testing other boards that use the existing SPI API. But most of all, I'd like some comments on the new API. Is this stuff usable for everyone? If not, why? Changed in v4: - Build fixes for various boards, drivers and commands - Provide common struct spi_slave definition that can be extended by drivers - Pass a struct spi_slave * to spi_cs_activate and spi_cs_deactivate - Make default bus and mode build-time configurable - Override default SPI bus ID and mode on mx32ads and imx31_litekit. Changed in v3: - Add opaque struct spi_slave for controller-specific data associated with a slave. - Add spi_claim_bus() and spi_release_bus() - Add spi_free_slave() - spi_setup() is now called spi_setup_slave() and returns a struct spi_slave - soft_spi now supports four SPI modes (CPOL|CPHA) - Add bus parameter to spi_setup_slave() - Convert the new i.MX32 SPI driver - Convert the new MC13783 RTC driver Changed in v2: - Convert the mpc8xxx_spi driver and the mpc8349emds board to the new API. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Tested-by: Guennadi Liakhovetski <lg@denx.de>
2008-05-16 09:10:31 +00:00
#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
Initial revision
2002-10-01 01:07:28 +00:00
/*
* Values from last command.
*/
sspi: add options to specify bus and mode and clean up error messages and help, removed pointless debug() call. Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-08-26 08:57:27 +00:00
static unsigned int bus;
static unsigned int cs;
static unsigned int mode;
SPI API improvements This patch gets rid of the spi_chipsel table and adds a handful of new functions that makes the SPI layer cleaner and more flexible. Instead of the spi_chipsel table, each board that wants to use SPI gets to implement three hooks: * spi_cs_activate(): Activates the chipselect for a given slave * spi_cs_deactivate(): Deactivates the chipselect for a given slave * spi_cs_is_valid(): Determines if the given bus/chipselect combination can be activated. Not all drivers may need those extra functions however. If that's the case, the board code may just leave them out (assuming they know what the driver needs) or rely on the linker to strip them out (assuming --gc-sections is being used.) To set up communication parameters for a given slave, the driver needs to call spi_setup_slave(). This returns a pointer to an opaque spi_slave struct which must be passed as a parameter to subsequent SPI calls. This struct can be freed by calling spi_free_slave(), but most driver probably don't want to do this. Before starting one or more SPI transfers, the driver must call spi_claim_bus() to gain exclusive access to the SPI bus and initialize the hardware. When all transfers are done, the driver must call spi_release_bus() to make the bus available to others, and possibly shut down the SPI controller hardware. spi_xfer() behaves mostly the same as before, but it now takes a spi_slave parameter instead of a spi_chipsel function pointer. It also got a new parameter, flags, which is used to specify chip select behaviour. This may be extended with other flags in the future. This patch has been build-tested on all powerpc and arm boards involved. I have not tested NIOS since I don't have a toolchain for it installed, so I expect some breakage there even though I've tried fixing up everything I could find by visual inspection. I have run-time tested this on AVR32 ATNGW100 using the atmel_spi and DataFlash drivers posted as a follow-up. I'd like some help testing other boards that use the existing SPI API. But most of all, I'd like some comments on the new API. Is this stuff usable for everyone? If not, why? Changed in v4: - Build fixes for various boards, drivers and commands - Provide common struct spi_slave definition that can be extended by drivers - Pass a struct spi_slave * to spi_cs_activate and spi_cs_deactivate - Make default bus and mode build-time configurable - Override default SPI bus ID and mode on mx32ads and imx31_litekit. Changed in v3: - Add opaque struct spi_slave for controller-specific data associated with a slave. - Add spi_claim_bus() and spi_release_bus() - Add spi_free_slave() - spi_setup() is now called spi_setup_slave() and returns a struct spi_slave - soft_spi now supports four SPI modes (CPOL|CPHA) - Add bus parameter to spi_setup_slave() - Convert the new i.MX32 SPI driver - Convert the new MC13783 RTC driver Changed in v2: - Convert the mpc8xxx_spi driver and the mpc8349emds board to the new API. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Tested-by: Guennadi Liakhovetski <lg@denx.de>
2008-05-16 09:10:31 +00:00
static int bitlen;
static uchar dout[MAX_SPI_BYTES];
static uchar din[MAX_SPI_BYTES];
Initial revision
2002-10-01 01:07:28 +00:00
dm: spi: Move cmd device code into its own function In preparation for changing the error handling in this code for driver model, move it into its own function. Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Signed-off-by: Simon Glass <sjg@chromium.org>
2014-09-15 12:33:22 +00:00
static int do_spi_xfer(int bus, int cs)
{
struct spi_slave *slave;
dm: spi: Adjust cmd_spi to work with driver model Driver model uses a different way to find the SPI bus and slave from the numbered devices given on the command line. Adjust the code to suit. We use a generic SPI device, and attach it to the SPI bus before performing the transaction. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
2014-10-14 05:41:56 +00:00
int ret = 0;
dm: spi: Move cmd device code into its own function In preparation for changing the error handling in this code for driver model, move it into its own function. Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Signed-off-by: Simon Glass <sjg@chromium.org>
2014-09-15 12:33:22 +00:00
dm: spi: Adjust cmd_spi to work with driver model Driver model uses a different way to find the SPI bus and slave from the numbered devices given on the command line. Adjust the code to suit. We use a generic SPI device, and attach it to the SPI bus before performing the transaction. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
2014-10-14 05:41:56 +00:00
#ifdef CONFIG_DM_SPI
char name[30], *str;
struct udevice *dev;
snprintf(name, sizeof(name), "generic_%d:%d", bus, cs);
str = strdup(name);
ret = spi_get_bus_and_cs(bus, cs, 1000000, mode, "spi_generic_drv",
str, &dev, &slave);
if (ret)
return ret;
#else
dm: spi: Move cmd device code into its own function In preparation for changing the error handling in this code for driver model, move it into its own function. Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Signed-off-by: Simon Glass <sjg@chromium.org>
2014-09-15 12:33:22 +00:00
slave = spi_setup_slave(bus, cs, 1000000, mode);
if (!slave) {
printf("Invalid device %d:%d\n", bus, cs);
return -EINVAL;
}
dm: spi: Adjust cmd_spi to work with driver model Driver model uses a different way to find the SPI bus and slave from the numbered devices given on the command line. Adjust the code to suit. We use a generic SPI device, and attach it to the SPI bus before performing the transaction. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
2014-10-14 05:41:56 +00:00
#endif
dm: spi: Move cmd device code into its own function In preparation for changing the error handling in this code for driver model, move it into its own function. Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Signed-off-by: Simon Glass <sjg@chromium.org>
2014-09-15 12:33:22 +00:00
dm: spi: Adjust cmd_spi to work with driver model Driver model uses a different way to find the SPI bus and slave from the numbered devices given on the command line. Adjust the code to suit. We use a generic SPI device, and attach it to the SPI bus before performing the transaction. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
2014-10-14 05:41:56 +00:00
ret = spi_claim_bus(slave);
if (ret)
goto done;
ret = spi_xfer(slave, bitlen, dout, din,
SPI_XFER_BEGIN | SPI_XFER_END);
#ifndef CONFIG_DM_SPI
/* We don't get an error code in this case */
if (ret)
ret = -EIO;
#endif
if (ret) {
printf("Error %d during SPI transaction\n", ret);
dm: spi: Move cmd device code into its own function In preparation for changing the error handling in this code for driver model, move it into its own function. Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Signed-off-by: Simon Glass <sjg@chromium.org>
2014-09-15 12:33:22 +00:00
} else {
int j;
for (j = 0; j < ((bitlen + 7) / 8); j++)
printf("%02X", din[j]);
printf("\n");
}
dm: spi: Adjust cmd_spi to work with driver model Driver model uses a different way to find the SPI bus and slave from the numbered devices given on the command line. Adjust the code to suit. We use a generic SPI device, and attach it to the SPI bus before performing the transaction. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
2014-10-14 05:41:56 +00:00
done:
dm: spi: Move cmd device code into its own function In preparation for changing the error handling in this code for driver model, move it into its own function. Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Signed-off-by: Simon Glass <sjg@chromium.org>
2014-09-15 12:33:22 +00:00
spi_release_bus(slave);
dm: spi: Adjust cmd_spi to work with driver model Driver model uses a different way to find the SPI bus and slave from the numbered devices given on the command line. Adjust the code to suit. We use a generic SPI device, and attach it to the SPI bus before performing the transaction. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
2014-10-14 05:41:56 +00:00
#ifndef CONFIG_DM_SPI
dm: spi: Move cmd device code into its own function In preparation for changing the error handling in this code for driver model, move it into its own function. Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Signed-off-by: Simon Glass <sjg@chromium.org>
2014-09-15 12:33:22 +00:00
spi_free_slave(slave);
dm: spi: Adjust cmd_spi to work with driver model Driver model uses a different way to find the SPI bus and slave from the numbered devices given on the command line. Adjust the code to suit. We use a generic SPI device, and attach it to the SPI bus before performing the transaction. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
2014-10-14 05:41:56 +00:00
#endif
dm: spi: Move cmd device code into its own function In preparation for changing the error handling in this code for driver model, move it into its own function. Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Signed-off-by: Simon Glass <sjg@chromium.org>
2014-09-15 12:33:22 +00:00
dm: spi: Adjust cmd_spi to work with driver model Driver model uses a different way to find the SPI bus and slave from the numbered devices given on the command line. Adjust the code to suit. We use a generic SPI device, and attach it to the SPI bus before performing the transaction. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
2014-10-14 05:41:56 +00:00
return ret;
dm: spi: Move cmd device code into its own function In preparation for changing the error handling in this code for driver model, move it into its own function. Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Signed-off-by: Simon Glass <sjg@chromium.org>
2014-09-15 12:33:22 +00:00
}
Initial revision
2002-10-01 01:07:28 +00:00
/*
* SPI read/write
*
* Syntax:
* spi {dev} {num_bits} {dout}
* {dev} is the device number for controlling chip select (see TBD)
* {num_bits} is the number of bits to send & receive (base 10)
* {dout} is a hexadecimal string of data to send
* The command prints out the hexadecimal string received via SPI.
*/
Make sure that argv[] argument pointers are not modified. The hush shell dynamically allocates (and re-allocates) memory for the argument strings in the "char *argv[]" argument vector passed to commands. Any code that modifies these pointers will cause serious corruption of the malloc data structures and crash U-Boot, so make sure the compiler can check that no such modifications are being done by changing the code into "char * const argv[]". This modification is the result of debugging a strange crash caused after adding a new command, which used the following argument processing code which has been working perfectly fine in all Unix systems since version 6 - but not so in U-Boot: int main (int argc, char **argv) { while (--argc > 0 && **++argv == '-') { /* ====> */ while (*++*argv) { switch (**argv) { case 'd': debug++; break; ... default: usage (); } } } ... } The line marked "====>" will corrupt the malloc data structures and usually cause U-Boot to crash when the next command gets executed by the shell. With the modification, the compiler will prevent this with an error: increment of read-only location '*argv' N.B.: The code above can be trivially rewritten like this: while (--argc > 0 && **++argv == '-') { char *arg = *argv; while (*++arg) { switch (*arg) { ... Signed-off-by: Wolfgang Denk <wd@denx.de> Acked-by: Mike Frysinger <vapier@gentoo.org>
2010-06-28 20:00:46 +00:00
int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
Initial revision
2002-10-01 01:07:28 +00:00
{
char *cp = 0;
uchar tmp;
int j;
/*
* We use the last specified parameters, unless new ones are
* entered.
*/
if ((flag & CMD_FLAG_REPEAT) == 0)
{
sspi: add options to specify bus and mode and clean up error messages and help, removed pointless debug() call. Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-08-26 08:57:27 +00:00
if (argc >= 2) {
mode = CONFIG_DEFAULT_SPI_MODE;
bus = simple_strtoul(argv[1], &cp, 10);
if (*cp == ':') {
cs = simple_strtoul(cp+1, &cp, 10);
} else {
cs = bus;
bus = CONFIG_DEFAULT_SPI_BUS;
}
cmd_spi: remove superfluous semicolon Reported-by: James Miller <jamesmiller@chromium.org> Signed-off-by: Marek Vasut <marex@denx.de> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2012-08-01 13:12:15 +00:00
if (*cp == '.')
sspi: add options to specify bus and mode and clean up error messages and help, removed pointless debug() call. Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-08-26 08:57:27 +00:00
mode = simple_strtoul(cp+1, NULL, 10);
}
Initial revision
2002-10-01 01:07:28 +00:00
if (argc >= 3)
bitlen = simple_strtoul(argv[2], NULL, 10);
* Patch by Andreas Oberritter, 09 Nov 2002: Change behaviour of NetLoop(): return -1 for errors, filesize otherwise; return code 0 is valid an means no file loaded - in this case the environment still gets updated! * Patches by Jon Diekema, 9 Nov 2002: - improve ADC/DAC clocking on the SACSng board to align the failing edges of LRCLK and SCLK - sbc8260 configuration tweaks - add status LED support for 82xx systems - wire sspi/sspo commands into command handler; improved error handlering - add timestamp support and alternate memory test to the SACSng configuration
2002-11-11 02:11:37 +00:00
if (argc >= 4) {
cp = argv[3];
for(j = 0; *cp; j++, cp++) {
tmp = *cp - '0';
if(tmp > 9)
tmp -= ('A' - '0') - 10;
if(tmp > 15)
tmp -= ('a' - 'A');
if(tmp > 15) {
sspi: add options to specify bus and mode and clean up error messages and help, removed pointless debug() call. Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-08-26 08:57:27 +00:00
printf("Hex conversion error on %c\n", *cp);
* Patch by Andreas Oberritter, 09 Nov 2002: Change behaviour of NetLoop(): return -1 for errors, filesize otherwise; return code 0 is valid an means no file loaded - in this case the environment still gets updated! * Patches by Jon Diekema, 9 Nov 2002: - improve ADC/DAC clocking on the SACSng board to align the failing edges of LRCLK and SCLK - sbc8260 configuration tweaks - add status LED support for 82xx systems - wire sspi/sspo commands into command handler; improved error handlering - add timestamp support and alternate memory test to the SACSng configuration
2002-11-11 02:11:37 +00:00
return 1;
}
if((j % 2) == 0)
dout[j / 2] = (tmp << 4);
else
dout[j / 2] |= tmp;
Initial revision
2002-10-01 01:07:28 +00:00
}
}
}
* Patch by Andreas Oberritter, 09 Nov 2002: Change behaviour of NetLoop(): return -1 for errors, filesize otherwise; return code 0 is valid an means no file loaded - in this case the environment still gets updated! * Patches by Jon Diekema, 9 Nov 2002: - improve ADC/DAC clocking on the SACSng board to align the failing edges of LRCLK and SCLK - sbc8260 configuration tweaks - add status LED support for 82xx systems - wire sspi/sspo commands into command handler; improved error handlering - add timestamp support and alternate memory test to the SACSng configuration
2002-11-11 02:11:37 +00:00
if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) {
sspi: add options to specify bus and mode and clean up error messages and help, removed pointless debug() call. Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-08-26 08:57:27 +00:00
printf("Invalid bitlen %d\n", bitlen);
* Patch by Andreas Oberritter, 09 Nov 2002: Change behaviour of NetLoop(): return -1 for errors, filesize otherwise; return code 0 is valid an means no file loaded - in this case the environment still gets updated! * Patches by Jon Diekema, 9 Nov 2002: - improve ADC/DAC clocking on the SACSng board to align the failing edges of LRCLK and SCLK - sbc8260 configuration tweaks - add status LED support for 82xx systems - wire sspi/sspo commands into command handler; improved error handlering - add timestamp support and alternate memory test to the SACSng configuration
2002-11-11 02:11:37 +00:00
return 1;
* Code cleanup: - remove trailing white space, trailing empty lines, C++ comments, etc. - split cmd_boot.c (separate cmd_bdinfo.c and cmd_load.c) * Patches by Kenneth Johansson, 25 Jun 2003: - major rework of command structure (work done mostly by Michal Cendrowski and Joakim Kristiansen)
2003-06-27 21:31:46 +00:00
}
* Patch by Andreas Oberritter, 09 Nov 2002: Change behaviour of NetLoop(): return -1 for errors, filesize otherwise; return code 0 is valid an means no file loaded - in this case the environment still gets updated! * Patches by Jon Diekema, 9 Nov 2002: - improve ADC/DAC clocking on the SACSng board to align the failing edges of LRCLK and SCLK - sbc8260 configuration tweaks - add status LED support for 82xx systems - wire sspi/sspo commands into command handler; improved error handlering - add timestamp support and alternate memory test to the SACSng configuration
2002-11-11 02:11:37 +00:00
dm: spi: Move cmd device code into its own function In preparation for changing the error handling in this code for driver model, move it into its own function. Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Signed-off-by: Simon Glass <sjg@chromium.org>
2014-09-15 12:33:22 +00:00
if (do_spi_xfer(bus, cs))
SPI API improvements This patch gets rid of the spi_chipsel table and adds a handful of new functions that makes the SPI layer cleaner and more flexible. Instead of the spi_chipsel table, each board that wants to use SPI gets to implement three hooks: * spi_cs_activate(): Activates the chipselect for a given slave * spi_cs_deactivate(): Deactivates the chipselect for a given slave * spi_cs_is_valid(): Determines if the given bus/chipselect combination can be activated. Not all drivers may need those extra functions however. If that's the case, the board code may just leave them out (assuming they know what the driver needs) or rely on the linker to strip them out (assuming --gc-sections is being used.) To set up communication parameters for a given slave, the driver needs to call spi_setup_slave(). This returns a pointer to an opaque spi_slave struct which must be passed as a parameter to subsequent SPI calls. This struct can be freed by calling spi_free_slave(), but most driver probably don't want to do this. Before starting one or more SPI transfers, the driver must call spi_claim_bus() to gain exclusive access to the SPI bus and initialize the hardware. When all transfers are done, the driver must call spi_release_bus() to make the bus available to others, and possibly shut down the SPI controller hardware. spi_xfer() behaves mostly the same as before, but it now takes a spi_slave parameter instead of a spi_chipsel function pointer. It also got a new parameter, flags, which is used to specify chip select behaviour. This may be extended with other flags in the future. This patch has been build-tested on all powerpc and arm boards involved. I have not tested NIOS since I don't have a toolchain for it installed, so I expect some breakage there even though I've tried fixing up everything I could find by visual inspection. I have run-time tested this on AVR32 ATNGW100 using the atmel_spi and DataFlash drivers posted as a follow-up. I'd like some help testing other boards that use the existing SPI API. But most of all, I'd like some comments on the new API. Is this stuff usable for everyone? If not, why? Changed in v4: - Build fixes for various boards, drivers and commands - Provide common struct spi_slave definition that can be extended by drivers - Pass a struct spi_slave * to spi_cs_activate and spi_cs_deactivate - Make default bus and mode build-time configurable - Override default SPI bus ID and mode on mx32ads and imx31_litekit. Changed in v3: - Add opaque struct spi_slave for controller-specific data associated with a slave. - Add spi_claim_bus() and spi_release_bus() - Add spi_free_slave() - spi_setup() is now called spi_setup_slave() and returns a struct spi_slave - soft_spi now supports four SPI modes (CPOL|CPHA) - Add bus parameter to spi_setup_slave() - Convert the new i.MX32 SPI driver - Convert the new MC13783 RTC driver Changed in v2: - Convert the mpc8xxx_spi driver and the mpc8349emds board to the new API. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Tested-by: Guennadi Liakhovetski <lg@denx.de>
2008-05-16 09:10:31 +00:00
return 1;
Initial revision
2002-10-01 01:07:28 +00:00
dm: spi: Move cmd device code into its own function In preparation for changing the error handling in this code for driver model, move it into its own function. Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Signed-off-by: Simon Glass <sjg@chromium.org>
2014-09-15 12:33:22 +00:00
return 0;
Initial revision
2002-10-01 01:07:28 +00:00
}
* Code cleanup: - remove trailing white space, trailing empty lines, C++ comments, etc. - split cmd_boot.c (separate cmd_bdinfo.c and cmd_load.c) * Patches by Kenneth Johansson, 25 Jun 2003: - major rework of command structure (work done mostly by Michal Cendrowski and Joakim Kristiansen)
2003-06-27 21:31:46 +00:00
/***************************************************/
Patch by Kenneth Johansson, 30 Jun 2003: get rid of MK_CMD_ENTRY macro; update doc/README.command
2003-07-01 21:06:45 +00:00
U_BOOT_CMD(
sspi, 5, 1, do_spi,
sspi: add options to specify bus and mode and clean up error messages and help, removed pointless debug() call. Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-08-26 08:57:27 +00:00
"SPI utility command",
"[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n"
"<bus> - Identifies the SPI bus\n"
"<cs> - Identifies the chip select\n"
"<mode> - Identifies the SPI mode to use\n"
* Code cleanup: - remove trailing white space, trailing empty lines, C++ comments, etc. - split cmd_boot.c (separate cmd_bdinfo.c and cmd_load.c) * Patches by Kenneth Johansson, 25 Jun 2003: - major rework of command structure (work done mostly by Michal Cendrowski and Joakim Kristiansen)
2003-06-27 21:31:46 +00:00
"<bit_len> - Number of bits to send (base 10)\n"
General help message cleanup Many of the help messages were not really helpful; for example, many commands that take no arguments would not print a correct synopsis line, but "No additional help available." which is not exactly wrong, but not helpful either. Commit ``Make "usage" messages more helpful.'' changed this partially. But it also became clear that lots of "Usage" and "Help" messages (fields "usage" and "help" in struct cmd_tbl_s respective) were actually redundant. This patch cleans this up - for example: Before: => help dtt dtt - Digital Thermometer and Thermostat Usage: dtt - Read temperature from digital thermometer and thermostat. After: => help dtt dtt - Read temperature from Digital Thermometer and Thermostat Usage: dtt Signed-off-by: Wolfgang Denk <wd@denx.de>
2009-05-24 15:06:54 +00:00
"<dout> - Hexadecimal string that gets sent"
* Code cleanup: - remove trailing white space, trailing empty lines, C++ comments, etc. - split cmd_boot.c (separate cmd_bdinfo.c and cmd_load.c) * Patches by Kenneth Johansson, 25 Jun 2003: - major rework of command structure (work done mostly by Michal Cendrowski and Joakim Kristiansen)
2003-06-27 21:31:46 +00:00
);
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