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https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
321 lines
8.5 KiB
C
321 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2011
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* egnite GmbH <info@egnite.de>
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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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