When accessing PHY registers it is often desirable to only update selected bits, so it is necessary to first read the current value before writing back an modified value with the relevant bits updated.
To simplify this and to allow such operations to be incorporated into simple shell scripts propose adding a 'modify' option to the existing mii command, which takes a mask indicating the bits to be updated in addition to a data value containing the new bits, ie, <updated> = (<data> & <mask>) | (<current> & ~<mask>).
Signed-off-by: Tim tim.james@macltd.com Cc: Nobuhiro Iwamatsu iwamatsu@nigauri.org Cc: Joe Hershberger joe.hershberger@gmail.com Cc: Jeroen Hofstee jeroen@myspectrum.nl Cc: Tom Rini trini@konsulko.com Cc: Tim tim.james@macltd.com --- Changes for v2: - Addressed checkpatch.pl messages. - No functional changes.
common/cmd_mii.c | 47 ++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 38 insertions(+), 9 deletions(-)
diff --git a/common/cmd_mii.c b/common/cmd_mii.c index 7c4a57a..d9d7f7b 100644 --- a/common/cmd_mii.c +++ b/common/cmd_mii.c @@ -249,6 +249,7 @@ static uint last_addr_lo; static uint last_addr_hi; static uint last_reg_lo; static uint last_reg_hi; +static uint last_mask;
static void extract_range( char * input, @@ -272,7 +273,7 @@ static int do_mii(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) char op[2]; unsigned char addrlo, addrhi, reglo, reghi; unsigned char addr, reg; - unsigned short data; + unsigned short data, mask; int rcode = 0; const char *devname;
@@ -294,6 +295,7 @@ static int do_mii(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) reglo = last_reg_lo; reghi = last_reg_hi; data = last_data; + mask = last_mask;
if ((flag & CMD_FLAG_REPEAT) == 0) { op[0] = argv[1][0]; @@ -307,7 +309,9 @@ static int do_mii(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) if (argc >= 4) extract_range(argv[3], ®lo, ®hi); if (argc >= 5) - data = simple_strtoul (argv[4], NULL, 16); + data = simple_strtoul(argv[4], NULL, 16); + if (argc >= 6) + mask = simple_strtoul(argv[5], NULL, 16); }
/* use current device */ @@ -375,6 +379,28 @@ static int do_mii(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) } } } + } else if (op[0] == 'm') { + for (addr = addrlo; addr <= addrhi; addr++) { + for (reg = reglo; reg <= reghi; reg++) { + unsigned short val = 0; + if (miiphy_read(devname, addr, + reg, &val)) { + printf("Error reading from the PHY"); + printf(" addr=%02x", addr); + printf(" reg=%02x\n", reg); + rcode = 1; + } else { + val = (val & ~mask) | (data & mask); + if (miiphy_write(devname, addr, + reg, val)) { + printf("Error writing to the PHY"); + printf(" addr=%02x", addr); + printf(" reg=%02x\n", reg); + rcode = 1; + } + } + } + } } else if (strncmp(op, "du", 2) == 0) { ushort regs[6]; int ok = 1; @@ -417,6 +443,7 @@ static int do_mii(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) last_reg_lo = reglo; last_reg_hi = reghi; last_data = data; + last_mask = mask;
return rcode; } @@ -424,13 +451,15 @@ static int do_mii(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) /***************************************************/
U_BOOT_CMD( - mii, 5, 1, do_mii, + mii, 6, 1, do_mii, "MII utility commands", - "device - list available devices\n" - "mii device <devname> - set current device\n" - "mii info <addr> - display MII PHY info\n" - "mii read <addr> <reg> - read MII PHY <addr> register <reg>\n" - "mii write <addr> <reg> <data> - write MII PHY <addr> register <reg>\n" - "mii dump <addr> <reg> - pretty-print <addr> <reg> (0-5 only)\n" + "device - list available devices\n" + "mii device <devname> - set current device\n" + "mii info <addr> - display MII PHY info\n" + "mii read <addr> <reg> - read MII PHY <addr> register <reg>\n" + "mii write <addr> <reg> <data> - write MII PHY <addr> register <reg>\n" + "mii modify <addr> <reg> <data> <mask> - modify MII PHY <addr> register <reg>\n" + " updating bits identified in <mask>\n" + "mii dump <addr> <reg> - pretty-print <addr> <reg> (0-5 only)\n" "Addr and/or reg may be ranges, e.g. 2-7." );