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Diffstat (limited to 'board/egnite/ethernut5/ethernut5_pwrman.c')
| -rw-r--r-- | board/egnite/ethernut5/ethernut5_pwrman.c | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/board/egnite/ethernut5/ethernut5_pwrman.c b/board/egnite/ethernut5/ethernut5_pwrman.c new file mode 100644 index 0000000..4b00038 --- /dev/null +++ b/board/egnite/ethernut5/ethernut5_pwrman.c @@ -0,0 +1,338 @@ +/* + * (C) Copyright 2011 + * egnite GmbH <info@egnite.de> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +/* + * 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 */ |