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I2C: adding new "i2c bus" Command to the I2C Subsystem.
With this Command it is possible to add new I2C Busses, which are behind 1 .. n I2C Muxes. Details see README. Signed-off-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Heiko Schocher
committed by
Wolfgang Denk
Wolfgang Denk
parent
c24853644d
commit
67b23a3228
267
common/cmd_i2c.c
267
common/cmd_i2c.c
@@ -83,7 +83,9 @@
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#include <common.h>
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#include <command.h>
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#include <environment.h>
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#include <i2c.h>
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#include <malloc.h>
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#include <asm/byteorder.h>
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/* Display values from last command.
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@@ -125,6 +127,14 @@ static uchar i2c_no_probes[] = CFG_I2C_NOPROBES;
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#define NUM_ELEMENTS_NOPROBE (sizeof(i2c_no_probes)/sizeof(i2c_no_probes[0]))
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#endif
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#if defined(CONFIG_I2C_MUX)
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static I2C_MUX_DEVICE *i2c_mux_devices = NULL;
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static int i2c_mux_busid = CFG_MAX_I2C_BUS;
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DECLARE_GLOBAL_DATA_PTR;
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#endif
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static int
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mod_i2c_mem(cmd_tbl_t *cmdtp, int incrflag, int flag, int argc, char *argv[]);
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@@ -1188,6 +1198,37 @@ int do_i2c_reset(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
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return 0;
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}
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#if defined(CONFIG_I2C_MUX)
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int do_i2c_add_bus(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
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{
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int ret=0;
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if (argc == 1) {
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/* show all busses */
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I2C_MUX *mux;
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I2C_MUX_DEVICE *device = i2c_mux_devices;
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printf ("Busses reached over muxes:\n");
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while (device != NULL) {
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printf ("Bus ID: %x\n", device->busid);
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printf (" reached over Mux(es):\n");
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mux = device->mux;
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while (mux != NULL) {
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printf (" %s@%x ch: %x\n", mux->name, mux->chip, mux->channel);
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mux = mux->next;
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}
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device = device->next;
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}
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} else {
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I2C_MUX_DEVICE *dev;
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dev = i2c_mux_ident_muxstring ((uchar *)argv[1]);
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ret = 0;
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}
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return ret;
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}
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#endif /* CONFIG_I2C_MUX */
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#if defined(CONFIG_I2C_MULTI_BUS)
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int do_i2c_bus_num(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
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{
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@@ -1226,6 +1267,10 @@ int do_i2c_bus_speed(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
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int do_i2c(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
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{
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#if defined(CONFIG_I2C_MUX)
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if (!strncmp(argv[1], "bu", 2))
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return do_i2c_add_bus(cmdtp, flag, --argc, ++argv);
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#endif /* CONFIG_I2C_MUX */
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if (!strncmp(argv[1], "sp", 2))
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return do_i2c_bus_speed(cmdtp, flag, --argc, ++argv);
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#if defined(CONFIG_I2C_MULTI_BUS)
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@@ -1264,6 +1309,9 @@ int do_i2c(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
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U_BOOT_CMD(
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i2c, 6, 1, do_i2c,
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"i2c - I2C sub-system\n",
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#if defined(CONFIG_I2C_MUX)
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"bus [muxtype:muxaddr:muxchannel] - add a new bus reached over muxes.\n"
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#endif /* CONFIG_I2C_MUX */
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"speed [speed] - show or set I2C bus speed\n"
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#if defined(CONFIG_I2C_MULTI_BUS)
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"i2c dev [dev] - show or set current I2C bus\n"
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@@ -1335,3 +1383,222 @@ U_BOOT_CMD(
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" (valid chip values 50..57)\n"
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);
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#endif
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#if defined(CONFIG_I2C_MUX)
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int i2c_mux_add_device(I2C_MUX_DEVICE *dev)
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{
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I2C_MUX_DEVICE *devtmp = i2c_mux_devices;
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if (i2c_mux_devices == NULL) {
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i2c_mux_devices = dev;
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return 0;
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}
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while (devtmp->next != NULL)
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devtmp = devtmp->next;
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devtmp->next = dev;
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return 0;
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}
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I2C_MUX_DEVICE *i2c_mux_search_device(int id)
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{
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I2C_MUX_DEVICE *device = i2c_mux_devices;
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while (device != NULL) {
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if (device->busid == id)
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return device;
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device = device->next;
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}
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return NULL;
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}
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/* searches in the buf from *pos the next ':'.
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* returns:
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* 0 if found (with *pos = where)
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* < 0 if an error occured
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* > 0 if the end of buf is reached
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*/
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static int i2c_mux_search_next (int *pos, uchar *buf, int len)
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{
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while ((buf[*pos] != ':') && (*pos < len)) {
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*pos += 1;
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}
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if (*pos >= len)
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return 1;
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if (buf[*pos] != ':')
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return -1;
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return 0;
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}
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static int i2c_mux_get_busid (void)
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{
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int tmp = i2c_mux_busid;
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i2c_mux_busid ++;
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return tmp;
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}
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/* Analyses a Muxstring and sends immediately the
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Commands to the Muxes. Runs from Flash.
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*/
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int i2c_mux_ident_muxstring_f (uchar *buf)
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{
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int pos = 0;
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int oldpos;
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int ret = 0;
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int len = strlen((char *)buf);
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int chip;
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uchar channel;
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int was = 0;
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while (ret == 0) {
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oldpos = pos;
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/* search name */
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ret = i2c_mux_search_next(&pos, buf, len);
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if (ret != 0)
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printf ("ERROR\n");
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/* search address */
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pos ++;
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oldpos = pos;
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ret = i2c_mux_search_next(&pos, buf, len);
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if (ret != 0)
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printf ("ERROR\n");
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buf[pos] = 0;
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chip = simple_strtoul((char *)&buf[oldpos], NULL, 16);
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buf[pos] = ':';
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/* search channel */
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pos ++;
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oldpos = pos;
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ret = i2c_mux_search_next(&pos, buf, len);
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if (ret < 0)
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printf ("ERROR\n");
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was = 0;
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if (buf[pos] != 0) {
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buf[pos] = 0;
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was = 1;
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}
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channel = simple_strtoul((char *)&buf[oldpos], NULL, 16);
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if (was)
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buf[pos] = ':';
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if (i2c_write(chip, 0, 0, &channel, 1) != 0) {
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printf ("Error setting Mux: chip:%x channel: \
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%x\n", chip, channel);
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return -1;
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}
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pos ++;
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oldpos = pos;
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}
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return 0;
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}
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/* Analyses a Muxstring and if this String is correct
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* adds a new I2C Bus.
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*/
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I2C_MUX_DEVICE *i2c_mux_ident_muxstring (uchar *buf)
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{
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I2C_MUX_DEVICE *device;
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I2C_MUX *mux;
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int pos = 0;
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int oldpos;
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int ret = 0;
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int len = strlen((char *)buf);
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int was = 0;
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device = (I2C_MUX_DEVICE *)malloc (sizeof(I2C_MUX_DEVICE));
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device->mux = NULL;
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device->busid = i2c_mux_get_busid ();
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device->next = NULL;
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while (ret == 0) {
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mux = (I2C_MUX *)malloc (sizeof(I2C_MUX));
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mux->next = NULL;
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/* search name of mux */
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oldpos = pos;
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ret = i2c_mux_search_next(&pos, buf, len);
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if (ret != 0)
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printf ("%s no name.\n", __FUNCTION__);
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mux->name = (char *)malloc (pos - oldpos + 1);
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memcpy (mux->name, &buf[oldpos], pos - oldpos);
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mux->name[pos - oldpos] = 0;
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/* search address */
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pos ++;
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oldpos = pos;
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ret = i2c_mux_search_next(&pos, buf, len);
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if (ret != 0)
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printf ("%s no mux address.\n", __FUNCTION__);
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buf[pos] = 0;
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mux->chip = simple_strtoul((char *)&buf[oldpos], NULL, 16);
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buf[pos] = ':';
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/* search channel */
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pos ++;
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oldpos = pos;
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ret = i2c_mux_search_next(&pos, buf, len);
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if (ret < 0)
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printf ("%s no mux channel.\n", __FUNCTION__);
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was = 0;
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if (buf[pos] != 0) {
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buf[pos] = 0;
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was = 1;
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}
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mux->channel = simple_strtoul((char *)&buf[oldpos], NULL, 16);
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if (was)
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buf[pos] = ':';
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if (device->mux == NULL)
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device->mux = mux;
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else {
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I2C_MUX *muxtmp = device->mux;
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while (muxtmp->next != NULL) {
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muxtmp = muxtmp->next;
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}
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muxtmp->next = mux;
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}
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pos ++;
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oldpos = pos;
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}
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if (ret > 0) {
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/* Add Device */
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i2c_mux_add_device (device);
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return device;
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}
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return NULL;
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}
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int i2x_mux_select_mux(int bus)
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{
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I2C_MUX_DEVICE *dev;
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I2C_MUX *mux;
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if ((gd->flags & GD_FLG_RELOC) != GD_FLG_RELOC) {
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/* select Default Mux Bus */
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#if defined(CFG_I2C_IVM_BUS)
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i2c_mux_ident_muxstring_f ((uchar *)CFG_I2C_IVM_BUS);
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#else
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{
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unsigned char *buf;
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buf = (unsigned char *) getenv("EEprom_ivm");
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if (buf != NULL)
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i2c_mux_ident_muxstring_f (buf);
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}
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#endif
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return 0;
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}
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dev = i2c_mux_search_device(bus);
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if (dev == NULL)
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return -1;
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mux = dev->mux;
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while (mux != NULL) {
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if (i2c_write(mux->chip, 0, 0, &mux->channel, 1) != 0) {
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printf ("Error setting Mux: chip:%x channel: \
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%x\n", mux->chip, mux->channel);
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return -1;
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}
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mux = mux->next;
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}
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return 0;
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}
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#endif /* CONFIG_I2C_MUX */
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