--- /dev/null
+/*
+ * (C) Copyright 2011
+ * egnite GmbH <info@egnite.de>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/*
+ * 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 */
Code Review / kvmfornfv.git / blobdiff