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