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openwrt/target/linux/bcm27xx/patches-5.10/950-0622-Add-Raspberry-Pi-P...

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From 2150bf813a64c18cdc56ae6b84036377c242cebd Mon Sep 17 00:00:00 2001
From: Serge Schneider <serge@raspberrypi.com>
Date: Mon, 2 Dec 2019 14:48:05 +0000
Subject: [PATCH] Add Raspberry Pi PoE+ HAT support
Signed-off-by: Serge Schneider <serge@raspberrypi.com>
---
drivers/hwmon/rpi-poe-fan.c | 35 +++-
drivers/power/supply/Kconfig | 6 +
drivers/power/supply/Makefile | 1 +
drivers/power/supply/rpi_poe_power.c | 227 +++++++++++++++++++++
include/soc/bcm2835/raspberrypi-firmware.h | 3 +-
5 files changed, 261 insertions(+), 11 deletions(-)
create mode 100644 drivers/power/supply/rpi_poe_power.c
--- a/drivers/hwmon/rpi-poe-fan.c
+++ b/drivers/hwmon/rpi-poe-fan.c
@@ -28,6 +28,7 @@
struct rpi_poe_fan_ctx {
struct mutex lock;
struct rpi_firmware *fw;
+ u32 set_tag;
unsigned int pwm_value;
unsigned int def_pwm_value;
unsigned int rpi_poe_fan_state;
@@ -43,13 +44,15 @@ struct fw_tag_data_s{
u32 ret;
};
-static int write_reg(struct rpi_firmware *fw, u32 reg, u32 *val){
+static int write_reg(struct rpi_firmware *fw, u32 reg, u32 *val, u32 set_tag)
+{
struct fw_tag_data_s fw_tag_data = {
.reg = reg,
.val = *val
};
int ret;
- ret = rpi_firmware_property(fw, RPI_FIRMWARE_SET_POE_HAT_VAL,
+
+ ret = rpi_firmware_property(fw, set_tag,
&fw_tag_data, sizeof(fw_tag_data));
if (ret) {
return ret;
@@ -82,7 +85,7 @@ static int rpi_poe_reboot(struct notifie
nb);
if (ctx->pwm_value != ctx->def_pwm_value)
- write_reg(ctx->fw, POE_CUR_PWM, &ctx->def_pwm_value);
+ write_reg(ctx->fw, POE_CUR_PWM, &ctx->def_pwm_value, ctx->set_tag);
return NOTIFY_DONE;
}
@@ -95,7 +98,7 @@ static int __set_pwm(struct rpi_poe_fan
if (ctx->pwm_value == pwm)
goto exit_set_pwm_err;
- ret = write_reg(ctx->fw, POE_CUR_PWM, &pwm);
+ ret = write_reg(ctx->fw, POE_CUR_PWM, &pwm, ctx->set_tag);
if (!ret)
ctx->pwm_value = pwm;
exit_set_pwm_err:
@@ -110,7 +113,7 @@ static int __set_def_pwm(struct rpi_poe
if (ctx->def_pwm_value == def_pwm)
goto exit_set_def_pwm_err;
- ret = write_reg(ctx->fw, POE_DEF_PWM, &def_pwm);
+ ret = write_reg(ctx->fw, POE_DEF_PWM, &def_pwm, ctx->set_tag);
if (!ret)
ctx->def_pwm_value = def_pwm;
exit_set_def_pwm_err:
@@ -297,6 +300,7 @@ static int rpi_poe_fan_probe(struct plat
struct device *hwmon;
struct device_node *np = pdev->dev.of_node;
struct device_node *fw_node;
+ u32 revision;
int ret;
fw_node = of_parse_phandle(np, "firmware", 0);
@@ -314,6 +318,17 @@ static int rpi_poe_fan_probe(struct plat
ctx->fw = rpi_firmware_get(fw_node);
if (!ctx->fw)
return -EPROBE_DEFER;
+ ret = rpi_firmware_property(ctx->fw,
+ RPI_FIRMWARE_GET_FIRMWARE_REVISION,
+ &revision, sizeof(revision));
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to get firmware revision: %i\n", ret);
+ return ret;
+ }
+ if (revision < 0x60af72e8)
+ ctx->set_tag = RPI_FIRMWARE_SET_POE_HAT_VAL_OLD;
+ else
+ ctx->set_tag = RPI_FIRMWARE_SET_POE_HAT_VAL;
platform_set_drvdata(pdev, ctx);
@@ -378,9 +393,9 @@ static int rpi_poe_fan_remove(struct pla
unregister_reboot_notifier(&ctx->nb);
thermal_cooling_device_unregister(ctx->cdev);
- if (ctx->pwm_value != value) {
- write_reg(ctx->fw, POE_CUR_PWM, &value);
- }
+ if (ctx->pwm_value != value)
+ write_reg(ctx->fw, POE_CUR_PWM, &value, ctx->set_tag);
+
return 0;
}
@@ -392,7 +407,7 @@ static int rpi_poe_fan_suspend(struct de
int ret = 0;
if (ctx->pwm_value != value)
- ret = write_reg(ctx->fw, POE_CUR_PWM, &value);
+ ret = write_reg(ctx->fw, POE_CUR_PWM, &value, ctx->set_tag);
return ret;
}
@@ -403,7 +418,7 @@ static int rpi_poe_fan_resume(struct dev
int ret = 0;
if (value != 0)
- ret = write_reg(ctx->fw, POE_CUR_PWM, &value);
+ ret = write_reg(ctx->fw, POE_CUR_PWM, &value, ctx->set_tag);
return ret;
}
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -28,6 +28,12 @@ config POWER_SUPPLY_HWMON
Say 'Y' here if you want power supplies to
have hwmon sysfs interface too.
+config RPI_POE_POWER
+ tristate "Raspberry Pi PoE+ HAT power supply driver"
+ depends on RASPBERRYPI_FIRMWARE
+ help
+ Say Y here to enable support for Raspberry Pi PoE+ (Power over Ethernet
+ Plus) HAT current measurement.
config PDA_POWER
tristate "Generic PDA/phone power driver"
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_POWER_SUPPLY) += power_supp
obj-$(CONFIG_POWER_SUPPLY_HWMON) += power_supply_hwmon.o
obj-$(CONFIG_GENERIC_ADC_BATTERY) += generic-adc-battery.o
+obj-$(CONFIG_RPI_POE_POWER) += rpi_poe_power.o
obj-$(CONFIG_PDA_POWER) += pda_power.o
obj-$(CONFIG_APM_POWER) += apm_power.o
obj-$(CONFIG_AXP20X_POWER) += axp20x_usb_power.o
--- /dev/null
+++ b/drivers/power/supply/rpi_poe_power.c
@@ -0,0 +1,227 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * rpi-poe-power.c - Raspberry Pi PoE+ HAT power supply driver.
+ *
+ * Copyright (C) 2019 Raspberry Pi (Trading) Ltd.
+ * Based on axp20x_ac_power.c by Quentin Schulz <quentin.schulz@free-electrons.com>
+ *
+ * Author: Serge Schneider <serge@raspberrypi.org>
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <soc/bcm2835/raspberrypi-firmware.h>
+
+#define RPI_POE_ADC_REG 0x2
+#define RPI_POE_FLAG_REG 0x4
+
+#define RPI_POE_FLAG_AT BIT(0)
+#define RPI_POE_FLAG_OC BIT(1)
+
+#define RPI_POE_CURRENT_AF_MAX (2500 * 1000)
+#define RPI_POE_CURRENT_AT_MAX (5000 * 1000)
+
+#define DRVNAME "rpi-poe-power-supply"
+
+struct rpi_poe_power_supply_ctx {
+ struct power_supply *supply;
+ struct rpi_firmware *fw;
+};
+
+struct fw_tag_data_s {
+ u32 reg;
+ u32 val;
+ u32 ret;
+};
+
+static int write_reg(struct rpi_firmware *fw, u32 reg, u32 *val)
+{
+ struct fw_tag_data_s fw_tag_data = {
+ .reg = reg,
+ .val = *val
+ };
+ int ret;
+
+ ret = rpi_firmware_property(fw, RPI_FIRMWARE_SET_POE_HAT_VAL,
+ &fw_tag_data, sizeof(fw_tag_data));
+ if (ret)
+ return ret;
+ else if (fw_tag_data.ret)
+ return -EIO;
+ return 0;
+}
+
+static int read_reg(struct rpi_firmware *fw, u32 reg, u32 *val)
+{
+ struct fw_tag_data_s fw_tag_data = {
+ .reg = reg,
+ .val = *val
+ };
+ int ret;
+
+ ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_POE_HAT_VAL,
+ &fw_tag_data, sizeof(fw_tag_data));
+ if (ret)
+ return ret;
+ else if (fw_tag_data.ret)
+ return -EIO;
+
+ *val = fw_tag_data.val;
+ return 0;
+}
+
+static int rpi_poe_power_supply_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *r_val)
+{
+ struct rpi_poe_power_supply_ctx *ctx = power_supply_get_drvdata(psy);
+ int ret;
+ unsigned int val = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_HEALTH:
+ ret = read_reg(ctx->fw, RPI_POE_FLAG_REG, &val);
+ if (ret)
+ return ret;
+
+ if (val & RPI_POE_FLAG_OC) {
+ r_val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+ val = RPI_POE_FLAG_OC;
+ ret = write_reg(ctx->fw, RPI_POE_FLAG_REG, &val);
+ if (ret)
+ return ret;
+ return 0;
+ }
+
+ r_val->intval = POWER_SUPPLY_HEALTH_GOOD;
+ return 0;
+
+ case POWER_SUPPLY_PROP_ONLINE:
+ ret = read_reg(ctx->fw, RPI_POE_ADC_REG, &val);
+ if (ret)
+ return ret;
+
+ r_val->intval = (val > 5);
+ return 0;
+
+ case POWER_SUPPLY_PROP_CURRENT_AVG:
+ val = 50;
+ ret = read_reg(ctx->fw, RPI_POE_ADC_REG, &val);
+ if (ret)
+ return ret;
+ val = (val * 3300)/9821;
+ r_val->intval = val * 1000;
+ return 0;
+
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ ret = read_reg(ctx->fw, RPI_POE_ADC_REG, &val);
+ if (ret)
+ return ret;
+ val = (val * 3300)/9821;
+ r_val->intval = val * 1000;
+ return 0;
+
+ case POWER_SUPPLY_PROP_CURRENT_MAX:
+ ret = read_reg(ctx->fw, RPI_POE_FLAG_REG, &val);
+ if (ret)
+ return ret;
+
+ if (val & RPI_POE_FLAG_AT) {
+ r_val->intval = RPI_POE_CURRENT_AT_MAX;
+ return 0;
+ }
+ r_val->intval = RPI_POE_CURRENT_AF_MAX;
+ return 0;
+
+ default:
+ return -EINVAL;
+ }
+
+ return -EINVAL;
+}
+
+static enum power_supply_property rpi_poe_power_supply_properties[] = {
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_CURRENT_AVG,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CURRENT_MAX,
+};
+
+static const struct power_supply_desc rpi_poe_power_supply_desc = {
+ .name = "rpi-poe",
+ .type = POWER_SUPPLY_TYPE_MAINS,
+ .properties = rpi_poe_power_supply_properties,
+ .num_properties = ARRAY_SIZE(rpi_poe_power_supply_properties),
+ .get_property = rpi_poe_power_supply_get_property,
+};
+
+static int rpi_poe_power_supply_probe(struct platform_device *pdev)
+{
+ struct power_supply_config psy_cfg = {};
+ struct rpi_poe_power_supply_ctx *ctx;
+ struct device_node *fw_node;
+ u32 revision;
+
+ if (!of_device_is_available(pdev->dev.of_node))
+ return -ENODEV;
+
+ fw_node = of_parse_phandle(pdev->dev.of_node, "firmware", 0);
+ if (!fw_node) {
+ dev_err(&pdev->dev, "Missing firmware node\n");
+ return -ENOENT;
+ }
+
+ ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->fw = rpi_firmware_get(fw_node);
+ if (!ctx->fw)
+ return -EPROBE_DEFER;
+ if (rpi_firmware_property(ctx->fw,
+ RPI_FIRMWARE_GET_FIRMWARE_REVISION,
+ &revision, sizeof(revision))) {
+ dev_err(&pdev->dev, "Failed to get firmware revision\n");
+ return -ENOENT;
+ }
+ if (revision < 0x60af72e8) {
+ dev_err(&pdev->dev, "Unsupported firmware\n");
+ return -ENOENT;
+ }
+ platform_set_drvdata(pdev, ctx);
+
+ psy_cfg.of_node = pdev->dev.of_node;
+ psy_cfg.drv_data = ctx;
+
+ ctx->supply = devm_power_supply_register(&pdev->dev,
+ &rpi_poe_power_supply_desc,
+ &psy_cfg);
+ if (IS_ERR(ctx->supply))
+ return PTR_ERR(ctx->supply);
+
+ return 0;
+}
+
+static const struct of_device_id of_rpi_poe_power_supply_match[] = {
+ { .compatible = "raspberrypi,rpi-poe-power-supply", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, of_rpi_poe_power_supply_match);
+
+static struct platform_driver rpi_poe_power_supply_driver = {
+ .probe = rpi_poe_power_supply_probe,
+ .driver = {
+ .name = DRVNAME,
+ .of_match_table = of_rpi_poe_power_supply_match
+ },
+};
+
+module_platform_driver(rpi_poe_power_supply_driver);
+
+MODULE_AUTHOR("Serge Schneider <serge@raspberrypi.org>");
+MODULE_ALIAS("platform:" DRVNAME);
+MODULE_DESCRIPTION("Raspberry Pi PoE+ HAT power supply driver");
+MODULE_LICENSE("GPL");
--- a/include/soc/bcm2835/raspberrypi-firmware.h
+++ b/include/soc/bcm2835/raspberrypi-firmware.h
@@ -94,7 +94,8 @@ enum rpi_firmware_property_tag {
RPI_FIRMWARE_GET_PERIPH_REG = 0x00030045,
RPI_FIRMWARE_SET_PERIPH_REG = 0x00038045,
RPI_FIRMWARE_GET_POE_HAT_VAL = 0x00030049,
- RPI_FIRMWARE_SET_POE_HAT_VAL = 0x00030050,
+ RPI_FIRMWARE_SET_POE_HAT_VAL = 0x00038049,
+ RPI_FIRMWARE_SET_POE_HAT_VAL_OLD = 0x00030050,
RPI_FIRMWARE_NOTIFY_XHCI_RESET = 0x00030058,
RPI_FIRMWARE_GET_REBOOT_FLAGS = 0x00030064,
RPI_FIRMWARE_SET_REBOOT_FLAGS = 0x00038064,
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