u-boot/cmd/mdio.c
Vladimir Oltean b4c20f20ad cmd: mdio: Fix access to arbitrary PHY addresses
Alex reported the following:

  "
  I'm doing some MDIO work on a freescale/NXP platform and I bumped into
  errors with this command:
  => mdio r emdio#3 5 3
  Reading from bus emdio#3
  "Synchronous Abort" handler, esr 0x8600000e
  elr: ffffffff862b8000 lr : 000000008200cce4 (reloc)
  ...

  mdio list does not list any PHYs currently because ethernet is using DM
  and the interfaces are not probed at this time.  The PHY does exist
  on the bus though.
  The above scenario works with this commit reverted:
  e55047ec51 cmd: mdio: Switch to generic
  helpers when accessing the registers

  The current code using generic helpers only works for PHYs that have
  been registered and show up in bus->phymap and crashes for arbitrary
  IDs.  I find it useful to allow reading from other addresses over MDIO
  too, certainly helpful for people debugging MDIO on various boards.
  "

Fix this by reverting to use the raw MDIO bus operations in case there
is no PHY probed based on DT at the specified address.

This restores the old behavior for these PHYs, which means that the
newly introduced MMD-over-C22 helpers won't be available for them, but
at least they will be accessible again without crashing the system.

Fixes: commit e55047ec51 ("cmd: mdio: Switch to generic helpers when accessing the registers")
Reported-by: Alex Marginean <alexm.osslist@gmail.com>
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Alex Marginean <alexm.osslist@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
2019-06-01 13:33:17 -05:00

321 lines
6.8 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2011 Freescale Semiconductor, Inc
* Andy Fleming
*/
/*
* MDIO Commands
*/
#include <common.h>
#include <command.h>
#include <miiphy.h>
#include <phy.h>
static char last_op[2];
static uint last_data;
static uint last_addr_lo;
static uint last_addr_hi;
static uint last_devad_lo;
static uint last_devad_hi;
static uint last_reg_lo;
static uint last_reg_hi;
static int extract_range(char *input, int *plo, int *phi)
{
char *end;
*plo = simple_strtol(input, &end, 16);
if (end == input)
return -1;
if ((*end == '-') && *(++end))
*phi = simple_strtol(end, NULL, 16);
else if (*end == '\0')
*phi = *plo;
else
return -1;
return 0;
}
static int mdio_write_ranges(struct mii_dev *bus,
int addrlo,
int addrhi, int devadlo, int devadhi,
int reglo, int reghi, unsigned short data,
int extended)
{
struct phy_device *phydev;
int addr, devad, reg;
int err = 0;
for (addr = addrlo; addr <= addrhi; addr++) {
phydev = bus->phymap[addr];
for (devad = devadlo; devad <= devadhi; devad++) {
for (reg = reglo; reg <= reghi; reg++) {
if (!phydev)
err = bus->write(bus, addr, devad,
reg, data);
else if (!extended)
err = phy_write_mmd(phydev, devad,
reg, data);
else
err = phydev->drv->writeext(phydev,
addr, devad, reg, data);
if (err)
goto err_out;
}
}
}
err_out:
return err;
}
static int mdio_read_ranges(struct mii_dev *bus,
int addrlo,
int addrhi, int devadlo, int devadhi,
int reglo, int reghi, int extended)
{
int addr, devad, reg;
struct phy_device *phydev;
printf("Reading from bus %s\n", bus->name);
for (addr = addrlo; addr <= addrhi; addr++) {
phydev = bus->phymap[addr];
printf("PHY at address %x:\n", addr);
for (devad = devadlo; devad <= devadhi; devad++) {
for (reg = reglo; reg <= reghi; reg++) {
int val;
if (!phydev)
val = bus->read(bus, addr, devad, reg);
else if (!extended)
val = phy_read_mmd(phydev, devad, reg);
else
val = phydev->drv->readext(phydev, addr,
devad, reg);
if (val < 0) {
printf("Error\n");
return val;
}
if (devad >= 0)
printf("%d.", devad);
printf("%d - 0x%x\n", reg, val & 0xffff);
}
}
}
return 0;
}
/* The register will be in the form [a[-b].]x[-y] */
static int extract_reg_range(char *input, int *devadlo, int *devadhi,
int *reglo, int *reghi)
{
char *regstr;
/* use strrchr to find the last string after a '.' */
regstr = strrchr(input, '.');
/* If it exists, extract the devad(s) */
if (regstr) {
char devadstr[32];
strncpy(devadstr, input, regstr - input);
devadstr[regstr - input] = '\0';
if (extract_range(devadstr, devadlo, devadhi))
return -1;
regstr++;
} else {
/* Otherwise, we have no devad, and we just got regs */
*devadlo = *devadhi = MDIO_DEVAD_NONE;
regstr = input;
}
return extract_range(regstr, reglo, reghi);
}
static int extract_phy_range(char *const argv[], int argc, struct mii_dev **bus,
struct phy_device **phydev,
int *addrlo, int *addrhi)
{
struct phy_device *dev = *phydev;
if ((argc < 1) || (argc > 2))
return -1;
/* If there are two arguments, it's busname addr */
if (argc == 2) {
*bus = miiphy_get_dev_by_name(argv[0]);
if (!*bus)
return -1;
return extract_range(argv[1], addrlo, addrhi);
}
/* It must be one argument, here */
/*
* This argument can be one of two things:
* 1) Ethernet device name
* 2) Just an address (use the previously-used bus)
*
* We check all buses for a PHY which is connected to an ethernet
* device by the given name. If none are found, we call
* extract_range() on the string, and see if it's an address range.
*/
dev = mdio_phydev_for_ethname(argv[0]);
if (dev) {
*addrlo = *addrhi = dev->addr;
*bus = dev->bus;
return 0;
}
/* It's an address or nothing useful */
return extract_range(argv[0], addrlo, addrhi);
}
/* ---------------------------------------------------------------- */
static int do_mdio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
char op[2];
int addrlo, addrhi, reglo, reghi, devadlo, devadhi;
unsigned short data;
int pos = argc - 1;
struct mii_dev *bus;
struct phy_device *phydev = NULL;
int extended = 0;
if (argc < 2)
return CMD_RET_USAGE;
/*
* We use the last specified parameters, unless new ones are
* entered.
*/
op[0] = argv[1][0];
addrlo = last_addr_lo;
addrhi = last_addr_hi;
devadlo = last_devad_lo;
devadhi = last_devad_hi;
reglo = last_reg_lo;
reghi = last_reg_hi;
data = last_data;
bus = mdio_get_current_dev();
if (flag & CMD_FLAG_REPEAT)
op[0] = last_op[0];
if (strlen(argv[1]) > 1) {
op[1] = argv[1][1];
if (op[1] == 'x') {
phydev = mdio_phydev_for_ethname(argv[2]);
if (phydev) {
addrlo = phydev->addr;
addrhi = addrlo;
bus = phydev->bus;
extended = 1;
} else {
return CMD_RET_FAILURE;
}
if (!phydev->drv ||
(!phydev->drv->writeext && (op[0] == 'w')) ||
(!phydev->drv->readext && (op[0] == 'r'))) {
puts("PHY does not have extended functions\n");
return CMD_RET_FAILURE;
}
}
}
switch (op[0]) {
case 'w':
if (pos > 1)
data = simple_strtoul(argv[pos--], NULL, 16);
case 'r':
if (pos > 1)
if (extract_reg_range(argv[pos--], &devadlo, &devadhi,
&reglo, &reghi))
return CMD_RET_FAILURE;
default:
if (pos > 1)
if (extract_phy_range(&argv[2], pos - 1, &bus,
&phydev, &addrlo, &addrhi))
return CMD_RET_FAILURE;
break;
}
if (op[0] == 'l') {
mdio_list_devices();
return 0;
}
/* Save the chosen bus */
miiphy_set_current_dev(bus->name);
switch (op[0]) {
case 'w':
mdio_write_ranges(bus, addrlo, addrhi, devadlo, devadhi,
reglo, reghi, data, extended);
break;
case 'r':
mdio_read_ranges(bus, addrlo, addrhi, devadlo, devadhi,
reglo, reghi, extended);
break;
}
/*
* Save the parameters for repeats.
*/
last_op[0] = op[0];
last_addr_lo = addrlo;
last_addr_hi = addrhi;
last_devad_lo = devadlo;
last_devad_hi = devadhi;
last_reg_lo = reglo;
last_reg_hi = reghi;
last_data = data;
return 0;
}
/***************************************************/
U_BOOT_CMD(
mdio, 6, 1, do_mdio,
"MDIO utility commands",
"list - List MDIO buses\n"
"mdio read <phydev> [<devad>.]<reg> - "
"read PHY's register at <devad>.<reg>\n"
"mdio write <phydev> [<devad>.]<reg> <data> - "
"write PHY's register at <devad>.<reg>\n"
"mdio rx <phydev> [<devad>.]<reg> - "
"read PHY's extended register at <devad>.<reg>\n"
"mdio wx <phydev> [<devad>.]<reg> <data> - "
"write PHY's extended register at <devad>.<reg>\n"
"<phydev> may be:\n"
" <busname> <addr>\n"
" <addr>\n"
" <eth name>\n"
"<addr> <devad>, and <reg> may be ranges, e.g. 1-5.4-0x1f.\n"
);