Ethernut 5 board support

Add support for the Ethernut 5 open hardware design, based
on Atmel's AT91SAM9XE512 SoC.

V4
 - Fix several coding style issues.
 - Move machine type to config file.
 - Remove use of CONFIG_ATMEL_LEGACY.

Signed-off-by: Tim Schendekehl <tim.schendekehl@egnite.de>

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 0000000000..4b00038457
--- /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 */