322 lines
8.5 KiB
C
322 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2011
|
|
* egnite GmbH <info@egnite.de>
|
|
*/
|
|
|
|
/*
|
|
* Ethernut 5 power management support
|
|
*
|
|
* This board may be supplied via USB, IEEE 802.3af PoE or an
|
|
* auxiliary DC input. An on-board ATmega168 microcontroller,
|
|
* the so called power management controller or PMC, is used
|
|
* to select the supply source and to switch on and off certain
|
|
* energy consuming board components. This allows to reduce the
|
|
* total stand-by consumption to less than 70mW.
|
|
*
|
|
* The main CPU communicates with the PMC via I2C. When
|
|
* CONFIG_CMD_BSP is defined in the board configuration file,
|
|
* then the board specific command 'pwrman' becomes available,
|
|
* which allows to manually deal with the PMC.
|
|
*
|
|
* Two distinct registers are provided by the PMC for enabling
|
|
* and disabling specific features. This avoids the often seen
|
|
* read-modify-write cycle or shadow register requirement.
|
|
* Additional registers are available to query the board
|
|
* status and temperature, the auxiliary voltage and to control
|
|
* the green user LED that is integrated in the reset switch.
|
|
*
|
|
* Note, that the AVR firmware of the PMC is released under BSDL.
|
|
*
|
|
* For additional information visit the project home page at
|
|
* http://www.ethernut.de/
|
|
*/
|
|
#include <common.h>
|
|
#include <asm/arch/at91sam9260.h>
|
|
#include <asm/arch/at91_common.h>
|
|
#include <asm/arch/gpio.h>
|
|
#include <asm/io.h>
|
|
#include <i2c.h>
|
|
|
|
#include "ethernut5_pwrman.h"
|
|
|
|
/* PMC firmware version */
|
|
static int pwrman_major;
|
|
static int pwrman_minor;
|
|
|
|
/*
|
|
* Enable Ethernut 5 power management.
|
|
*
|
|
* This function must be called during board initialization.
|
|
* While we are using u-boot's I2C subsystem, it may be required
|
|
* to enable the serial port before calling this function,
|
|
* in particular when debugging is enabled.
|
|
*
|
|
* If board specific commands are not available, we will activate
|
|
* all board components.
|
|
*/
|
|
void ethernut5_power_init(void)
|
|
{
|
|
pwrman_minor = i2c_reg_read(PWRMAN_I2C_ADDR, PWRMAN_REG_VERS);
|
|
pwrman_major = pwrman_minor >> 4;
|
|
pwrman_minor &= 15;
|
|
|
|
#ifndef CONFIG_CMD_BSP
|
|
/* Do not modify anything, if we do not have a known version. */
|
|
if (pwrman_major == 2) {
|
|
/* Without board specific commands we enable all features. */
|
|
i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_ENA, ~PWRMAN_ETHRST);
|
|
i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_DIS, PWRMAN_ETHRST);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Reset Ethernet PHY.
|
|
*
|
|
* This function allows the re-configure the PHY after
|
|
* changing its strap pins.
|
|
*/
|
|
void ethernut5_phy_reset(void)
|
|
{
|
|
/* Do not modify anything, if we do not have a known version. */
|
|
if (pwrman_major != 2)
|
|
return;
|
|
|
|
/*
|
|
* Make sure that the Ethernet clock is enabled and the PHY reset
|
|
* is disabled for at least 100 us.
|
|
*/
|
|
i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_ENA, PWRMAN_ETHCLK);
|
|
i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_DIS, PWRMAN_ETHRST);
|
|
udelay(100);
|
|
|
|
/*
|
|
* LAN8710 strap pins are
|
|
* PA14 => PHY MODE0
|
|
* PA15 => PHY MODE1
|
|
* PA17 => PHY MODE2 => 111b all capable
|
|
* PA18 => PHY ADDR0 => 0b
|
|
*/
|
|
at91_set_pio_input(AT91_PIO_PORTA, 14, 1);
|
|
at91_set_pio_input(AT91_PIO_PORTA, 15, 1);
|
|
at91_set_pio_input(AT91_PIO_PORTA, 17, 1);
|
|
at91_set_pio_input(AT91_PIO_PORTA, 18, 0);
|
|
|
|
/* Activate PHY reset for 100 us. */
|
|
i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_ENA, PWRMAN_ETHRST);
|
|
udelay(100);
|
|
i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_DIS, PWRMAN_ETHRST);
|
|
|
|
at91_set_pio_input(AT91_PIO_PORTA, 14, 1);
|
|
}
|
|
|
|
/*
|
|
* Output the firmware version we got during initialization.
|
|
*/
|
|
void ethernut5_print_version(void)
|
|
{
|
|
printf("%u.%u\n", pwrman_major, pwrman_minor);
|
|
}
|
|
|
|
/*
|
|
* All code below this point is optional and implements
|
|
* the 'pwrman' command.
|
|
*/
|
|
#ifdef CONFIG_CMD_BSP
|
|
|
|
/* Human readable names of PMC features */
|
|
char *pwrman_feat[8] = {
|
|
"board", "vbin", "vbout", "mmc",
|
|
"rs232", "ethclk", "ethrst", "wakeup"
|
|
};
|
|
|
|
/*
|
|
* Print all feature names, that have its related flags enabled.
|
|
*/
|
|
static void print_flagged_features(u8 flags)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
if (flags & (1 << i))
|
|
printf("%s ", pwrman_feat[i]);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return flags of a given list of feature names.
|
|
*
|
|
* The function stops at the first unknown list entry and
|
|
* returns the number of detected names as a function result.
|
|
*/
|
|
static int feature_flags(char * const names[], int num, u8 *flags)
|
|
{
|
|
int i, j;
|
|
|
|
*flags = 0;
|
|
for (i = 0; i < num; i++) {
|
|
for (j = 0; j < 8; j++) {
|
|
if (strcmp(pwrman_feat[j], names[i]) == 0) {
|
|
*flags |= 1 << j;
|
|
break;
|
|
}
|
|
}
|
|
if (j > 7)
|
|
break;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
void ethernut5_print_power(void)
|
|
{
|
|
u8 flags;
|
|
int i;
|
|
|
|
flags = i2c_reg_read(PWRMAN_I2C_ADDR, PWRMAN_REG_ENA);
|
|
for (i = 0; i < 2; i++) {
|
|
if (flags) {
|
|
print_flagged_features(flags);
|
|
printf("%s\n", i ? "off" : "on");
|
|
}
|
|
flags = ~flags;
|
|
}
|
|
}
|
|
|
|
void ethernut5_print_celsius(void)
|
|
{
|
|
int val;
|
|
|
|
/* Read ADC value from LM50 and return Celsius degrees. */
|
|
val = i2c_reg_read(PWRMAN_I2C_ADDR, PWRMAN_REG_TEMP);
|
|
val *= 5000; /* 100mV/degree with 5V reference */
|
|
val += 128; /* 8 bit resolution */
|
|
val /= 256;
|
|
val -= 450; /* Celsius offset, still x10 */
|
|
/* Output full degrees. */
|
|
printf("%d\n", (val + 5) / 10);
|
|
}
|
|
|
|
void ethernut5_print_voltage(void)
|
|
{
|
|
int val;
|
|
|
|
/* Read ADC value from divider and return voltage. */
|
|
val = i2c_reg_read(PWRMAN_I2C_ADDR, PWRMAN_REG_VAUX);
|
|
/* Resistors are 100k and 12.1k */
|
|
val += 5;
|
|
val *= 180948;
|
|
val /= 100000;
|
|
val++;
|
|
/* Calculation was done in 0.1V units. */
|
|
printf("%d\n", (val + 5) / 10);
|
|
}
|
|
|
|
/*
|
|
* Process the board specific 'pwrman' command.
|
|
*/
|
|
int do_pwrman(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
|
|
{
|
|
u8 val;
|
|
int i;
|
|
|
|
if (argc == 1) {
|
|
ethernut5_print_power();
|
|
} else if (argc == 2 && strcmp(argv[1], "reset") == 0) {
|
|
at91_set_pio_output(AT91_PIO_PORTB, 8, 1);
|
|
udelay(100);
|
|
at91_set_pio_output(AT91_PIO_PORTB, 8, 0);
|
|
udelay(100000);
|
|
} else if (argc == 2 && strcmp(argv[1], "temp") == 0) {
|
|
ethernut5_print_celsius();
|
|
} else if (argc == 2 && strcmp(argv[1], "vaux") == 0) {
|
|
ethernut5_print_voltage();
|
|
} else if (argc == 2 && strcmp(argv[1], "version") == 0) {
|
|
ethernut5_print_version();
|
|
} else if (strcmp(argv[1], "led") == 0) {
|
|
/* Control the green status LED. Blink frequency unit
|
|
** is 0.1s, very roughly. */
|
|
if (argc == 2) {
|
|
/* No more arguments, output current settings. */
|
|
val = i2c_reg_read(PWRMAN_I2C_ADDR, PWRMAN_REG_LEDCTL);
|
|
printf("led %u %u\n", val >> 4, val & 15);
|
|
} else {
|
|
/* First argument specifies the on-time. */
|
|
val = (u8) simple_strtoul(argv[2], NULL, 0);
|
|
val <<= 4;
|
|
if (argc > 3) {
|
|
/* Second argument specifies the off-time. */
|
|
val |= (u8) (simple_strtoul(argv[3], NULL, 0)
|
|
& 15);
|
|
}
|
|
/* Update the LED control register. */
|
|
i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_LEDCTL, val);
|
|
}
|
|
} else {
|
|
/* We expect a list of features followed an optional status. */
|
|
argc--;
|
|
i = feature_flags(&argv[1], argc, &val);
|
|
if (argc == i) {
|
|
/* We got a list only, print status. */
|
|
val &= i2c_reg_read(PWRMAN_I2C_ADDR, PWRMAN_REG_STA);
|
|
if (val) {
|
|
if (i > 1)
|
|
print_flagged_features(val);
|
|
printf("active\n");
|
|
} else {
|
|
printf("inactive\n");
|
|
}
|
|
} else {
|
|
/* More arguments. */
|
|
if (i == 0) {
|
|
/* No given feature, use despensibles. */
|
|
val = PWRMAN_DISPENSIBLE;
|
|
}
|
|
if (strcmp(argv[i + 1], "on") == 0) {
|
|
/* Enable features. */
|
|
i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_ENA,
|
|
val);
|
|
} else if (strcmp(argv[i + 1], "off") == 0) {
|
|
/* Disable features. */
|
|
i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_DIS,
|
|
val);
|
|
} else {
|
|
printf("Bad parameter %s\n", argv[i + 1]);
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
U_BOOT_CMD(
|
|
pwrman, CONFIG_SYS_MAXARGS, 1, do_pwrman,
|
|
"power management",
|
|
"- print settings\n"
|
|
"pwrman feature ...\n"
|
|
" - print status\n"
|
|
"pwrman [feature ...] on|off\n"
|
|
" - enable/disable specified or all dispensible features\n"
|
|
"pwrman led [on-time [off-time]]\n"
|
|
" - print or set led blink timer\n"
|
|
"pwrman temp\n"
|
|
" - print board temperature (Celsius)\n"
|
|
"pwrman vaux\n"
|
|
" - print auxiliary input voltage\n"
|
|
"pwrman reset\n"
|
|
" - reset power management controller\n"
|
|
"pwrman version\n"
|
|
" - print firmware version\n"
|
|
"\n"
|
|
" features, (*)=dispensible:\n"
|
|
" board - 1.8V and 3.3V supply\n"
|
|
" vbin - supply via USB device connector\n"
|
|
" vbout - USB host connector supply(*)\n"
|
|
" mmc - MMC slot supply(*)\n"
|
|
" rs232 - RS232 driver\n"
|
|
" ethclk - Ethernet PHY clock(*)\n"
|
|
" ethrst - Ethernet PHY reset\n"
|
|
" wakeup - RTC alarm"
|
|
);
|
|
#endif /* CONFIG_CMD_BSP */
|