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-rw-r--r--sys/dev/iicbus/ad7417.c621
1 files changed, 621 insertions, 0 deletions
diff --git a/sys/dev/iicbus/ad7417.c b/sys/dev/iicbus/ad7417.c
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index 0000000..6ae16be
--- /dev/null
+++ b/sys/dev/iicbus/ad7417.c
@@ -0,0 +1,621 @@
+/*-
+ * Copyright (c) 2010 Andreas Tobler
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/systm.h>
+#include <sys/module.h>
+#include <sys/callout.h>
+#include <sys/conf.h>
+#include <sys/cpu.h>
+#include <sys/ctype.h>
+#include <sys/kernel.h>
+#include <sys/reboot.h>
+#include <sys/rman.h>
+#include <sys/sysctl.h>
+#include <sys/limits.h>
+
+#include <machine/bus.h>
+#include <machine/md_var.h>
+
+#include <dev/iicbus/iicbus.h>
+#include <dev/iicbus/iiconf.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <powerpc/powermac/powermac_thermal.h>
+
+/* CPU A/B sensors, temp and adc: AD7417. */
+
+#define AD7417_TEMP 0x00
+#define AD7417_CONFIG 0x01
+#define AD7417_ADC 0x04
+#define AD7417_CONFIG2 0x05
+#define AD7417_CONFMASK 0xe0
+
+uint8_t adc741x_config;
+
+struct ad7417_sensor {
+ struct pmac_therm therm;
+ device_t dev;
+ int id;
+ enum {
+ ADC7417_TEMP_SENSOR,
+ ADC7417_ADC_SENSOR
+ } type;
+};
+
+struct write_data {
+ uint8_t reg;
+ uint8_t val;
+};
+
+struct read_data {
+ uint8_t reg;
+ uint16_t val;
+};
+
+/* Regular bus attachment functions */
+static int ad7417_probe(device_t);
+static int ad7417_attach(device_t);
+
+/* Utility functions */
+static int ad7417_sensor_sysctl(SYSCTL_HANDLER_ARGS);
+static int ad7417_write(device_t dev, uint32_t addr, uint8_t reg,
+ uint8_t *buf, int len);
+static int ad7417_read_1(device_t dev, uint32_t addr, uint8_t reg,
+ uint8_t *data);
+static int ad7417_read_2(device_t dev, uint32_t addr, uint8_t reg,
+ uint16_t *data);
+static int ad7417_write_read(device_t dev, uint32_t addr,
+ struct write_data out, struct read_data *in);
+static int ad7417_diode_read(struct ad7417_sensor *sens);
+static int ad7417_adc_read(struct ad7417_sensor *sens);
+static int ad7417_sensor_read(struct ad7417_sensor *sens);
+
+struct ad7417_softc {
+ device_t sc_dev;
+ uint32_t sc_addr;
+ struct ad7417_sensor *sc_sensors;
+ int sc_nsensors;
+};
+static device_method_t ad7417_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, ad7417_probe),
+ DEVMETHOD(device_attach, ad7417_attach),
+ { 0, 0 },
+};
+
+static driver_t ad7417_driver = {
+ "ad7417",
+ ad7417_methods,
+ sizeof(struct ad7417_softc)
+};
+
+static devclass_t ad7417_devclass;
+
+DRIVER_MODULE(ad7417, iicbus, ad7417_driver, ad7417_devclass, 0, 0);
+MALLOC_DEFINE(M_AD7417, "ad7417", "Supply-Monitor AD7417");
+
+
+static int
+ad7417_write(device_t dev, uint32_t addr, uint8_t reg, uint8_t *buff, int len)
+{
+ unsigned char buf[4];
+ int try = 0;
+
+ struct iic_msg msg[] = {
+ { addr, IIC_M_WR, 0, buf }
+ };
+
+ msg[0].len = len + 1;
+ buf[0] = reg;
+ memcpy(buf + 1, buff, len);
+
+ for (;;)
+ {
+ if (iicbus_transfer(dev, msg, 1) == 0)
+ return (0);
+
+ if (++try > 5) {
+ device_printf(dev, "iicbus write failed\n");
+ return (-1);
+ }
+ pause("ad7417_write", hz);
+ }
+}
+
+static int
+ad7417_read_1(device_t dev, uint32_t addr, uint8_t reg, uint8_t *data)
+{
+ uint8_t buf[4];
+ int err, try = 0;
+
+ struct iic_msg msg[2] = {
+ { addr, IIC_M_WR | IIC_M_NOSTOP, 1, &reg },
+ { addr, IIC_M_RD, 1, buf },
+ };
+
+ for (;;)
+ {
+ err = iicbus_transfer(dev, msg, 2);
+ if (err != 0)
+ goto retry;
+
+ *data = *((uint8_t*)buf);
+ return (0);
+ retry:
+ if (++try > 5) {
+ device_printf(dev, "iicbus read failed\n");
+ return (-1);
+ }
+ pause("ad7417_read_1", hz);
+ }
+}
+
+static int
+ad7417_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data)
+{
+ uint8_t buf[4];
+ int err, try = 0;
+
+ struct iic_msg msg[2] = {
+ { addr, IIC_M_WR | IIC_M_NOSTOP, 1, &reg },
+ { addr, IIC_M_RD, 2, buf },
+ };
+
+ for (;;)
+ {
+ err = iicbus_transfer(dev, msg, 2);
+ if (err != 0)
+ goto retry;
+
+ *data = *((uint16_t*)buf);
+ return (0);
+ retry:
+ if (++try > 5) {
+ device_printf(dev, "iicbus read failed\n");
+ return (-1);
+ }
+ pause("ad7417_read_2", hz);
+ }
+}
+
+static int
+ad7417_write_read(device_t dev, uint32_t addr, struct write_data out,
+ struct read_data *in)
+{
+ uint8_t buf[4];
+ int err, try = 0;
+
+ /* Do a combined write/read. */
+ struct iic_msg msg[3] = {
+ { addr, IIC_M_WR, 2, buf },
+ { addr, IIC_M_WR | IIC_M_NOSTOP, 1, &in->reg },
+ { addr, IIC_M_RD, 2, buf },
+ };
+
+ /* Prepare the write msg. */
+ buf[0] = out.reg;
+ buf[1] = out.val & 0xff;
+
+ for (;;)
+ {
+ err = iicbus_transfer(dev, msg, 3);
+ if (err != 0)
+ goto retry;
+
+ in->val = *((uint16_t*)buf);
+ return (0);
+ retry:
+ if (++try > 5) {
+ device_printf(dev, "iicbus write/read failed\n");
+ return (-1);
+ }
+ pause("ad7417_write_read", hz);
+ }
+}
+
+static int
+ad7417_init_adc(device_t dev, uint32_t addr)
+{
+ uint8_t buf;
+ int err;
+
+ adc741x_config = 0;
+ /* Clear Config2 */
+ buf = 0;
+
+ err = ad7417_write(dev, addr, AD7417_CONFIG2, &buf, 1);
+
+ /* Read & cache Config1 */
+ buf = 0;
+ err = ad7417_write(dev, addr, AD7417_CONFIG, &buf, 1);
+ err = ad7417_read_1(dev, addr, AD7417_CONFIG, &buf);
+ adc741x_config = (uint8_t)buf;
+
+ /* Disable shutdown mode */
+ adc741x_config &= 0xfe;
+ buf = adc741x_config;
+ err = ad7417_write(dev, addr, AD7417_CONFIG, &buf, 1);
+ if (err < 0)
+ return (-1);
+
+ return (0);
+
+}
+static int
+ad7417_probe(device_t dev)
+{
+ const char *name, *compatible;
+ struct ad7417_softc *sc;
+
+ name = ofw_bus_get_name(dev);
+ compatible = ofw_bus_get_compat(dev);
+
+ if (!name)
+ return (ENXIO);
+
+ if (strcmp(name, "supply-monitor") != 0 ||
+ strcmp(compatible, "ad7417") != 0)
+ return (ENXIO);
+
+ sc = device_get_softc(dev);
+ sc->sc_dev = dev;
+ sc->sc_addr = iicbus_get_addr(dev);
+
+ device_set_desc(dev, "Supply-Monitor AD7417");
+
+ return (0);
+}
+
+/*
+ * This function returns the number of sensors. If we call it the second time
+ * and we have allocated memory for sc->sc_sensors, we fill in the properties.
+ */
+static int
+ad7417_fill_sensor_prop(device_t dev)
+{
+ phandle_t child;
+ struct ad7417_softc *sc;
+ u_int id[10];
+ char location[96];
+ char type[32];
+ int i = 0, j, len = 0, prop_len, prev_len = 0;
+
+ sc = device_get_softc(dev);
+
+ child = ofw_bus_get_node(dev);
+
+ /* Fill the sensor location property. */
+ prop_len = OF_getprop(child, "hwsensor-location", location,
+ sizeof(location));
+ while (len < prop_len) {
+ if (sc->sc_sensors != NULL)
+ strcpy(sc->sc_sensors[i].therm.name, location + len);
+ prev_len = strlen(location + len) + 1;
+ len += prev_len;
+ i++;
+ }
+ if (sc->sc_sensors == NULL)
+ return (i);
+
+ /* Fill the sensor type property. */
+ len = 0;
+ i = 0;
+ prev_len = 0;
+ prop_len = OF_getprop(child, "hwsensor-type", type, sizeof(type));
+ while (len < prop_len) {
+ if (strcmp(type + len, "temperature") == 0)
+ sc->sc_sensors[i].type = ADC7417_TEMP_SENSOR;
+ else
+ sc->sc_sensors[i].type = ADC7417_ADC_SENSOR;
+ prev_len = strlen(type + len) + 1;
+ len += prev_len;
+ i++;
+ }
+
+ /* Fill the sensor id property. Taken from OF. */
+ prop_len = OF_getprop(child, "hwsensor-id", id, sizeof(id));
+ for (j = 0; j < i; j++)
+ sc->sc_sensors[j].id = id[j];
+
+ /* Fill the sensor zone property. Taken from OF. */
+ prop_len = OF_getprop(child, "hwsensor-zone", id, sizeof(id));
+ for (j = 0; j < i; j++)
+ sc->sc_sensors[j].therm.zone = id[j];
+
+ /* Finish setting up sensor properties */
+ for (j = 0; j < i; j++) {
+ sc->sc_sensors[j].dev = dev;
+
+ /* HACK: Apple wired a random diode to the ADC line */
+ if (strstr(sc->sc_sensors[j].therm.name, "DIODE TEMP")
+ != NULL) {
+ sc->sc_sensors[j].type = ADC7417_TEMP_SENSOR;
+ sc->sc_sensors[j].therm.read =
+ (int (*)(struct pmac_therm *))(ad7417_diode_read);
+ } else {
+ sc->sc_sensors[j].therm.read =
+ (int (*)(struct pmac_therm *))(ad7417_sensor_read);
+ }
+
+ if (sc->sc_sensors[j].type != ADC7417_TEMP_SENSOR)
+ continue;
+
+ /* Make up some ranges */
+ sc->sc_sensors[j].therm.target_temp = 500 + ZERO_C_TO_K;
+ sc->sc_sensors[j].therm.max_temp = 900 + ZERO_C_TO_K;
+
+ pmac_thermal_sensor_register(&sc->sc_sensors[j].therm);
+ }
+
+ return (i);
+}
+
+static int
+ad7417_attach(device_t dev)
+{
+ struct ad7417_softc *sc;
+ struct sysctl_oid *oid, *sensroot_oid;
+ struct sysctl_ctx_list *ctx;
+ char sysctl_name[32];
+ int i, j;
+ const char *unit;
+ const char *desc;
+
+ sc = device_get_softc(dev);
+
+ sc->sc_nsensors = 0;
+
+ /* Count the actual number of sensors. */
+ sc->sc_nsensors = ad7417_fill_sensor_prop(dev);
+
+ device_printf(dev, "%d sensors detected.\n", sc->sc_nsensors);
+
+ if (sc->sc_nsensors == 0)
+ device_printf(dev, "WARNING: No AD7417 sensors detected!\n");
+
+ sc->sc_sensors = malloc (sc->sc_nsensors * sizeof(struct ad7417_sensor),
+ M_AD7417, M_WAITOK | M_ZERO);
+
+ ctx = device_get_sysctl_ctx(dev);
+ sensroot_oid = SYSCTL_ADD_NODE(ctx,
+ SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "sensor",
+ CTLFLAG_RD, 0, "AD7417 Sensor Information");
+
+ /* Now we can fill the properties into the allocated struct. */
+ sc->sc_nsensors = ad7417_fill_sensor_prop(dev);
+
+ /* Add sysctls for the sensors. */
+ for (i = 0; i < sc->sc_nsensors; i++) {
+ for (j = 0; j < strlen(sc->sc_sensors[i].therm.name); j++) {
+ sysctl_name[j] =
+ tolower(sc->sc_sensors[i].therm.name[j]);
+ if (isspace(sysctl_name[j]))
+ sysctl_name[j] = '_';
+ }
+ sysctl_name[j] = 0;
+
+ oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sensroot_oid),
+ OID_AUTO,
+ sysctl_name, CTLFLAG_RD, 0,
+ "Sensor Information");
+
+ if (sc->sc_sensors[i].type == ADC7417_TEMP_SENSOR) {
+ unit = "temp";
+ desc = "Sensor temp in C";
+ } else {
+ unit = "volt";
+ desc = "Sensor Volt in V";
+ }
+ /* I use i to pass the sensor id. */
+ SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
+ unit, CTLTYPE_INT | CTLFLAG_RD, dev,
+ i, ad7417_sensor_sysctl,
+ sc->sc_sensors[i].type == ADC7417_TEMP_SENSOR ?
+ "IK" : "I", desc);
+ }
+ /* Dump sensor location, ID & type. */
+ if (bootverbose) {
+ device_printf(dev, "Sensors\n");
+ for (i = 0; i < sc->sc_nsensors; i++) {
+ device_printf(dev, "Location: %s ID: %d type: %d\n",
+ sc->sc_sensors[i].therm.name,
+ sc->sc_sensors[i].id,
+ sc->sc_sensors[i].type);
+ }
+ }
+
+ return (0);
+}
+
+static int
+ad7417_get_temp(device_t dev, uint32_t addr, int *temp)
+{
+ uint16_t buf[2];
+ uint16_t read;
+ int err;
+
+ err = ad7417_read_2(dev, addr, AD7417_TEMP, buf);
+
+ if (err < 0)
+ return (-1);
+
+ read = *((int16_t*)buf);
+
+ /* The ADC is 10 bit, the resolution is 0.25 C.
+ The temperature is in tenth kelvin.
+ */
+ *temp = (((int16_t)(read & 0xffc0)) >> 6) * 25 / 10;
+ return (0);
+}
+
+static int
+ad7417_get_adc(device_t dev, uint32_t addr, unsigned int *value,
+ uint8_t chan)
+{
+ uint8_t tmp;
+ int err;
+ struct write_data config;
+ struct read_data data;
+
+ tmp = chan << 5;
+ config.reg = AD7417_CONFIG;
+ data.reg = AD7417_ADC;
+ data.val = 0;
+
+ err = ad7417_read_1(dev, addr, AD7417_CONFIG, &config.val);
+
+ config.val = (config.val & ~AD7417_CONFMASK) | (tmp & AD7417_CONFMASK);
+
+ err = ad7417_write_read(dev, addr, config, &data);
+ if (err < 0)
+ return (-1);
+
+ *value = ((uint32_t)data.val) >> 6;
+
+ return (0);
+}
+
+static int
+ad7417_diode_read(struct ad7417_sensor *sens)
+{
+ static int eeprom_read = 0;
+ static cell_t eeprom[2][40];
+ phandle_t eeprom_node;
+ int rawval, diode_slope, diode_offset;
+ int temp;
+
+ if (!eeprom_read) {
+ eeprom_node = OF_finddevice("/u3/i2c/cpuid@a0");
+ OF_getprop(eeprom_node, "cpuid", eeprom[0], sizeof(eeprom[0]));
+ eeprom_node = OF_finddevice("/u3/i2c/cpuid@a2");
+ OF_getprop(eeprom_node, "cpuid", eeprom[1], sizeof(eeprom[1]));
+ eeprom_read = 1;
+ }
+
+ rawval = ad7417_adc_read(sens);
+ if (rawval < 0)
+ return (-1);
+
+ if (strstr(sens->therm.name, "CPU B") != NULL) {
+ diode_slope = eeprom[1][0x11] >> 16;
+ diode_offset = (int16_t)(eeprom[1][0x11] & 0xffff) << 12;
+ } else {
+ diode_slope = eeprom[0][0x11] >> 16;
+ diode_offset = (int16_t)(eeprom[0][0x11] & 0xffff) << 12;
+ }
+
+ temp = (rawval*diode_slope + diode_offset) >> 2;
+ temp = (10*(temp >> 16)) + ((10*(temp & 0xffff)) >> 16);
+
+ return (temp + ZERO_C_TO_K);
+}
+
+static int
+ad7417_adc_read(struct ad7417_sensor *sens)
+{
+ struct ad7417_softc *sc;
+ uint8_t chan;
+ int temp;
+
+ sc = device_get_softc(sens->dev);
+
+ switch (sens->id) {
+ case 11:
+ case 16:
+ chan = 1;
+ break;
+ case 12:
+ case 17:
+ chan = 2;
+ break;
+ case 13:
+ case 18:
+ chan = 3;
+ break;
+ case 14:
+ case 19:
+ chan = 4;
+ break;
+ default:
+ chan = 1;
+ }
+
+ if (ad7417_get_adc(sc->sc_dev, sc->sc_addr, &temp, chan) < 0)
+ return (-1);
+
+ return (temp);
+}
+
+
+static int
+ad7417_sensor_read(struct ad7417_sensor *sens)
+{
+ struct ad7417_softc *sc;
+ int temp;
+
+ sc = device_get_softc(sens->dev);
+
+ /* Init the ADC. */
+ if (ad7417_init_adc(sc->sc_dev, sc->sc_addr) < 0)
+ return (-1);
+
+ if (sens->type == ADC7417_TEMP_SENSOR) {
+ if (ad7417_get_temp(sc->sc_dev, sc->sc_addr, &temp) < 0)
+ return (-1);
+ temp += ZERO_C_TO_K;
+ } else {
+ temp = ad7417_adc_read(sens);
+ }
+ return (temp);
+}
+
+static int
+ad7417_sensor_sysctl(SYSCTL_HANDLER_ARGS)
+{
+ device_t dev;
+ struct ad7417_softc *sc;
+ struct ad7417_sensor *sens;
+ int value = 0;
+ int error;
+
+ dev = arg1;
+ sc = device_get_softc(dev);
+ sens = &sc->sc_sensors[arg2];
+
+ value = sens->therm.read(&sens->therm);
+ if (value < 0)
+ return (ENXIO);
+
+ error = sysctl_handle_int(oidp, &value, 0, req);
+
+ return (error);
+}
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