[PATCH 4/4] hwmon: Support Aspeed AST2600 PWM/Fan tachometer
Troy Lee
troy_lee at aspeedtech.com
Wed Dec 9 18:59:20 AEDT 2020
Add Aspeed AST2600 PWM/Fan tacho driver. AST2600 has 16 PWM channel and
16 FAN tacho channel.
Signed-off-by: Troy Lee <troy_lee at aspeedtech.com>
---
drivers/hwmon/Kconfig | 10 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/aspeed2600-pwm-tacho.c | 1053 ++++++++++++++++++++++++++
3 files changed, 1064 insertions(+)
create mode 100644 drivers/hwmon/aspeed2600-pwm-tacho.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 9aa89d7d4193..097c01430259 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -400,6 +400,16 @@ config SENSORS_ASPEED
This driver can also be built as a module. If so, the module
will be called aspeed_pwm_tacho.
+config SENSORS_ASPEED2600_PWM_TACHO
+ tristate "ASPEED AST2600 PWM and Fan Tachometer"
+ depends on THERMAL || THERMAL=n
+ help
+ This driver provides support for ASPEED AST2600 PWM
+ and Fan Tacho controllers.
+
+ This driver can also be built as a module. If so, the module
+ will be called aspeed2600-pwm-tacho.
+
config SENSORS_ATXP1
tristate "Attansic ATXP1 VID controller"
depends on I2C
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index ae41ee71a71b..10be45768d36 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_SENSORS_ARM_SCPI) += scpi-hwmon.o
obj-$(CONFIG_SENSORS_AS370) += as370-hwmon.o
obj-$(CONFIG_SENSORS_ASC7621) += asc7621.o
obj-$(CONFIG_SENSORS_ASPEED) += aspeed-pwm-tacho.o
+obj-$(CONFIG_SENSORS_ASPEED2600_PWM_TACHO) += aspeed2600-pwm-tacho.o
obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o
obj-$(CONFIG_SENSORS_AXI_FAN_CONTROL) += axi-fan-control.o
obj-$(CONFIG_SENSORS_BT1_PVT) += bt1-pvt.o
diff --git a/drivers/hwmon/aspeed2600-pwm-tacho.c b/drivers/hwmon/aspeed2600-pwm-tacho.c
new file mode 100644
index 000000000000..083eb3b253ff
--- /dev/null
+++ b/drivers/hwmon/aspeed2600-pwm-tacho.c
@@ -0,0 +1,1053 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) ASPEED Technology Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 or later as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/errno.h>
+#include <linux/gpio/consumer.h>
+#include <linux/delay.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/sysfs.h>
+#include <linux/reset.h>
+#include <linux/regmap.h>
+#include <linux/thermal.h>
+/**********************************************************
+ * PWM HW register offset define
+ *********************************************************/
+//PWM Control Register
+#define ASPEED_PWM_CTRL_CH(ch) ((ch * 0x10) + 0x00)
+//PWM Duty Cycle Register
+#define ASPEED_PWM_DUTY_CYCLE_CH(ch) ((ch * 0x10) + 0x04)
+//TACH Control Register
+#define ASPEED_TACHO_CTRL_CH(ch) ((ch * 0x10) + 0x08)
+//TACH Status Register
+#define ASPEED_TACHO_STS_CH(x) ((x * 0x10) + 0x0C)
+/**********************************************************
+ * PWM register Bit field
+ *********************************************************/
+/*PWM_CTRL */
+#define PWM_LOAD_SEL_AS_WDT_BIT (19) //load selection as WDT
+#define PWM_DUTY_LOAD_AS_WDT_EN BIT(18) //enable PWM duty load as WDT
+#define PWM_DUTY_SYNC_DIS BIT(17) //disable PWM duty sync
+#define PWM_CLK_ENABLE BIT(16) //enable PWM clock
+#define PWM_LEVEL_OUTPUT BIT(15) //output PWM level
+#define PWM_INVERSE BIT(14) //inverse PWM pin
+#define PWM_OPEN_DRAIN_EN BIT(13) //enable open-drain
+#define PWM_PIN_EN BIT(12) //enable PWM pin
+#define PWM_CLK_DIV_H_MASK (0xf << 8) //PWM clock division H bit [3:0]
+#define PWM_CLK_DIV_L_MASK (0xff) //PWM clock division H bit [3:0]
+/* [19] */
+#define LOAD_SEL_FALLING 0
+#define LOAD_SEL_RIGING 1
+
+/*PWM_DUTY_CYCLE */
+#define PWM_PERIOD_BIT (24) //pwm period bit [7:0]
+#define PWM_PERIOD_BIT_MASK (0xff << 24) //pwm period bit [7:0]
+#define PWM_RISING_FALLING_AS_WDT_BIT (16)
+#define PWM_RISING_FALLING_AS_WDT_MASK (0xff << 16) //pwm rising/falling point bit [7:0] as WDT
+#define PWM_RISING_FALLING_MASK (0xffff)
+#define PWM_FALLING_POINT_BIT (8) //pwm falling point bit [7:0]
+#define PWM_RISING_POINT_BIT (0) //pwm rising point bit [7:0]
+/* [31:24] */
+#define DEFAULT_PWM_PERIOD 0xff
+
+/*PWM_TACHO_CTRL */
+#define TACHO_IER BIT(31) //enable tacho interrupt
+#define TACHO_INVERS_LIMIT BIT(30) //inverse tacho limit comparison
+#define TACHO_LOOPBACK BIT(29) //tacho loopback
+#define TACHO_ENABLE BIT(28) //{enable tacho}
+#define TACHO_DEBOUNCE_MASK (0x3 << 26) //{tacho de-bounce}
+#define TACHO_DEBOUNCE_BIT (26) //{tacho de-bounce}
+#define TECHIO_EDGE_MASK (0x3 << 24) //tacho edge}
+#define TECHIO_EDGE_BIT (24) //tacho edge}
+#define TACHO_CLK_DIV_T_MASK (0xf << 20)
+#define TACHO_CLK_DIV_BIT (20)
+#define TACHO_THRESHOLD_MASK (0xfffff) //tacho threshold bit
+/* [27:26] */
+#define DEBOUNCE_3_CLK 0x00 /* 10b */
+#define DEBOUNCE_2_CLK 0x01 /* 10b */
+#define DEBOUNCE_1_CLK 0x02 /* 10b */
+#define DEBOUNCE_0_CLK 0x03 /* 10b */
+/* [25:24] */
+#define F2F_EDGES 0x00 /* 10b */
+#define R2R_EDGES 0x01 /* 10b */
+#define BOTH_EDGES 0x02 /* 10b */
+/* [23:20] */
+/* Cover rpm range 5~5859375 */
+#define DEFAULT_TACHO_DIV 5
+
+/*PWM_TACHO_STS */
+#define TACHO_ISR BIT(31) //interrupt status and clear
+#define PWM_OUT BIT(25) //{pwm_out}
+#define PWM_OEN BIT(24) //{pwm_oeN}
+#define TACHO_DEB_INPUT BIT(23) //tacho deB input
+#define TACHO_RAW_INPUT BIT(22) //tacho raw input}
+#define TACHO_VALUE_UPDATE BIT(21) //tacho value updated since the last read
+#define TACHO_FULL_MEASUREMENT BIT(20) //{tacho full measurement}
+#define TACHO_VALUE_MASK 0xfffff //tacho value bit [19:0]}
+/**********************************************************
+ * Software setting
+ *********************************************************/
+#define DEFAULT_TARGET_PWM_FREQ 25000
+#define DEFAULT_FAN_PULSE_PR 2
+#define MAX_CDEV_NAME_LEN 16
+
+struct aspeed_pwm_channel_params {
+ int target_freq;
+ int pwm_freq;
+ int load_wdt_rising_falling_pt;
+ int load_wdt_selection; //0: rising , 1: falling
+ int load_wdt_enable;
+ int duty_sync_enable;
+ int invert_pin;
+ u8 rising;
+ u8 falling;
+};
+
+static struct aspeed_pwm_channel_params default_pwm_params[] = {
+ [0] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 1,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+ [1] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 0,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+ [2] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 0,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+ [3] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 0,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+ [4] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 0,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+ [5] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 0,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+ [6] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 0,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+ [7] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 0,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+ [8] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 0,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+ [9] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 0,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+ [10] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 0,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+ [11] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 0,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+ [12] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 0,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+ [13] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 0,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+ [14] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 0,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+ [15] = {
+ .target_freq = 25000,
+ .load_wdt_rising_falling_pt = 0x10,
+ .load_wdt_selection = LOAD_SEL_FALLING,
+ .load_wdt_enable = 0,
+ .duty_sync_enable = 0,
+ .invert_pin = 0,
+ .rising = 0x00,
+ .falling = 0x0a,
+ },
+};
+
+struct aspeed_tacho_channel_params {
+ int limited_inverse;
+ u16 threshold;
+ u8 tacho_edge;
+ u8 tacho_debounce;
+ u8 pulse_pr;
+ u32 divide;
+};
+
+
+static struct aspeed_tacho_channel_params default_tacho_params[] = {
+ [0] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+ [1] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+ [2] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+ [3] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+ [4] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+ [5] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+ [6] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+ [7] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+ [8] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+ [9] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+ [10] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+ [11] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+ [12] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+ [13] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+ [14] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+ [15] = {
+ .limited_inverse = 0,
+ .threshold = 0,
+ .tacho_edge = F2F_EDGES,
+ .tacho_debounce = DEBOUNCE_3_CLK,
+ .pulse_pr = DEFAULT_FAN_PULSE_PR,
+ .divide = 8,
+ },
+};
+
+struct aspeed_pwm_tachometer_data {
+ struct regmap *regmap;
+ unsigned long clk_freq;
+ struct reset_control *reset;
+ bool pwm_present[16];
+ bool fan_tach_present[16];
+ struct aspeed_pwm_channel_params *pwm_channel;
+ struct aspeed_tacho_channel_params *tacho_channel;
+ /* for thermal */
+ struct aspeed_cooling_device *cdev[8];
+ /* for hwmon */
+ const struct attribute_group *groups[3];
+};
+
+struct aspeed_cooling_device {
+ char name[16];
+ struct aspeed_pwm_tachometer_data *priv;
+ struct thermal_cooling_device *tcdev;
+ int pwm_channel;
+ u8 *cooling_levels;
+ u8 max_state;
+ u8 cur_state;
+};
+
+static int regmap_aspeed_pwm_tachometer_reg_write(void *context, unsigned int reg,
+ unsigned int val)
+{
+ void __iomem *regs = (void __iomem *)context;
+
+ writel(val, regs + reg);
+ return 0;
+}
+
+static int regmap_aspeed_pwm_tachometer_reg_read(void *context, unsigned int reg,
+ unsigned int *val)
+{
+ void __iomem *regs = (void __iomem *)context;
+
+ *val = readl(regs + reg);
+ return 0;
+}
+
+static const struct regmap_config aspeed_pwm_tachometer_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = 0x100,
+ .reg_write = regmap_aspeed_pwm_tachometer_reg_write,
+ .reg_read = regmap_aspeed_pwm_tachometer_reg_read,
+ .fast_io = true,
+};
+
+static void aspeed_set_pwm_channel_enable(struct regmap *regmap, u8 pwm_channel,
+ bool enable)
+{
+ regmap_update_bits(regmap, ASPEED_PWM_CTRL_CH(pwm_channel),
+ (PWM_CLK_ENABLE | PWM_PIN_EN),
+ enable ? (PWM_CLK_ENABLE | PWM_PIN_EN) : 0);
+}
+
+static void aspeed_set_fan_tach_ch_enable(struct aspeed_pwm_tachometer_data *priv, u8 fan_tach_ch,
+ bool enable, u32 tacho_div)
+{
+ u32 reg_value = 0;
+
+ if (enable) {
+ /* divide = 2^(tacho_div*2) */
+ priv->tacho_channel[fan_tach_ch].divide = 1 << (tacho_div << 1);
+
+ reg_value = TACHO_ENABLE |
+ (priv->tacho_channel[fan_tach_ch].tacho_edge << TECHIO_EDGE_BIT) |
+ (tacho_div << TACHO_CLK_DIV_BIT) |
+ (priv->tacho_channel[fan_tach_ch].tacho_debounce << TACHO_DEBOUNCE_BIT);
+
+ if (priv->tacho_channel[fan_tach_ch].limited_inverse)
+ reg_value |= TACHO_INVERS_LIMIT;
+
+ if (priv->tacho_channel[fan_tach_ch].threshold)
+ reg_value |= (TACHO_IER | priv->tacho_channel[fan_tach_ch].threshold);
+
+ regmap_write(priv->regmap, ASPEED_TACHO_CTRL_CH(fan_tach_ch), reg_value);
+ } else
+ regmap_update_bits(priv->regmap, ASPEED_TACHO_CTRL_CH(fan_tach_ch), TACHO_ENABLE, 0);
+}
+
+/*
+ * The PWM frequency = HCLK(200Mhz) / (clock division L bit *
+ * clock division H bit * (period bit + 1))
+ */
+static void aspeed_set_pwm_channel_fan_ctrl(struct device *dev,
+ struct aspeed_pwm_tachometer_data *priv,
+ u8 index, u8 fan_ctrl)
+{
+ u32 duty_value, ctrl_value;
+ u32 div_h, div_l, cal_freq;
+ u8 div_found;
+
+ if (fan_ctrl == 0) {
+ aspeed_set_pwm_channel_enable(priv->regmap, index, false);
+ } else {
+ cal_freq = priv->clk_freq / (DEFAULT_PWM_PERIOD + 1);
+ //calculate for target frequence
+ div_found = 0;
+ for (div_h = 0; div_h < 0x10; div_h++) {
+ for (div_l = 0; div_l < 0x100; div_l++) {
+ dev_dbg(dev, "div h %x, l : %x , freq %ld \n", div_h, div_l,
+ (cal_freq / (BIT(div_h) * (div_l + 1))));
+ if ((cal_freq / (BIT(div_h) * (div_l + 1))) < priv->pwm_channel[index].target_freq) {
+ div_found = 1;
+ break;
+ }
+ }
+ if (div_found)
+ break;
+ }
+
+ priv->pwm_channel[index].pwm_freq = cal_freq / (BIT(div_h) * (div_l + 1));
+ dev_dbg(dev, "div h %x, l : %x pwm out clk %d \n", div_h, div_l,
+ priv->pwm_channel[index].pwm_freq);
+ dev_dbg(dev, "hclk %ld, target pwm freq %d, real pwm freq %d\n", priv->clk_freq,
+ priv->pwm_channel[index].target_freq, priv->pwm_channel[index].pwm_freq);
+
+ ctrl_value = (div_h << 8) | div_l;
+
+ duty_value = (DEFAULT_PWM_PERIOD << PWM_PERIOD_BIT) |
+ (0 << PWM_RISING_POINT_BIT) | (fan_ctrl << PWM_FALLING_POINT_BIT);
+
+ if (priv->pwm_channel[index].load_wdt_enable) {
+ ctrl_value |= PWM_DUTY_LOAD_AS_WDT_EN;
+ ctrl_value |= priv->pwm_channel[index].load_wdt_selection << PWM_LOAD_SEL_AS_WDT_BIT;
+ duty_value |= (priv->pwm_channel[index].load_wdt_rising_falling_pt << PWM_RISING_FALLING_AS_WDT_BIT);
+ }
+
+ regmap_write(priv->regmap, ASPEED_PWM_DUTY_CYCLE_CH(index), duty_value);
+ regmap_write(priv->regmap, ASPEED_PWM_CTRL_CH(index), ctrl_value);
+
+ aspeed_set_pwm_channel_enable(priv->regmap, index, true);
+ }
+}
+
+static int aspeed_get_fan_tach_ch_rpm(struct device *dev, struct aspeed_pwm_tachometer_data *priv,
+ u8 fan_tach_ch)
+{
+ u32 raw_data, tach_div, clk_source, val;
+ int i, retries = 3;
+
+ for (i = 0; i < retries; i++) {
+ regmap_read(priv->regmap, ASPEED_TACHO_STS_CH(fan_tach_ch), &val);
+ if (TACHO_FULL_MEASUREMENT & val)
+ break;
+ }
+
+ raw_data = val & TACHO_VALUE_MASK;
+ if (raw_data == 0xfffff)
+ return 0;
+
+ raw_data += 1;
+
+ /*
+ * We need the mode to determine if the raw_data is double (from
+ * counting both edges).
+ */
+ tach_div = raw_data * (priv->tacho_channel[fan_tach_ch].divide) * (priv->tacho_channel[fan_tach_ch].pulse_pr);
+
+ dev_dbg(dev, "clk %ld, raw_data %d , tach_div %d \n", priv->clk_freq, raw_data, tach_div);
+ clk_source = priv->clk_freq;
+
+ if (raw_data == 0)
+ return 0;
+
+ return ((clk_source / tach_div) * 60);
+
+}
+
+static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+ int index = sensor_attr->index;
+ int ret;
+ struct aspeed_pwm_tachometer_data *priv = dev_get_drvdata(dev);
+ long fan_ctrl;
+ u8 org_falling = priv->pwm_channel[index].falling;
+
+ ret = kstrtol(buf, 10, &fan_ctrl);
+ if (ret != 0)
+ return ret;
+
+ if (fan_ctrl < 0 || fan_ctrl > DEFAULT_PWM_PERIOD)
+ return -EINVAL;
+
+ if (priv->pwm_channel[index].falling == fan_ctrl)
+ return count;
+
+ priv->pwm_channel[index].falling = fan_ctrl;
+
+ if (fan_ctrl == 0)
+ aspeed_set_pwm_channel_enable(priv->regmap, index, false);
+ else {
+ if (fan_ctrl == DEFAULT_PWM_PERIOD)
+ regmap_update_bits(priv->regmap,
+ ASPEED_PWM_DUTY_CYCLE_CH(index),
+ GENMASK(15, 0), 0);
+ else
+ regmap_update_bits(priv->regmap,
+ ASPEED_PWM_DUTY_CYCLE_CH(index),
+ GENMASK(15, 8),
+ (fan_ctrl << PWM_FALLING_POINT_BIT));
+ }
+
+ if (org_falling == 0)
+ aspeed_set_pwm_channel_enable(priv->regmap, index, true);
+
+ return count;
+}
+
+static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+ int index = sensor_attr->index;
+ struct aspeed_pwm_tachometer_data *priv = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", priv->pwm_channel[index].falling);
+}
+
+static ssize_t show_rpm(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+ int index = sensor_attr->index;
+ int rpm;
+ struct aspeed_pwm_tachometer_data *priv = dev_get_drvdata(dev);
+
+ rpm = aspeed_get_fan_tach_ch_rpm(dev, priv, index);
+ if (rpm < 0)
+ return rpm;
+
+ return sprintf(buf, "%d\n", rpm);
+}
+
+static umode_t pwm_is_visible(struct kobject *kobj,
+ struct attribute *a, int index)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct aspeed_pwm_tachometer_data *priv = dev_get_drvdata(dev);
+
+ if (!priv->pwm_present[index])
+ return 0;
+ return a->mode;
+}
+
+static umode_t fan_dev_is_visible(struct kobject *kobj,
+ struct attribute *a, int index)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct aspeed_pwm_tachometer_data *priv = dev_get_drvdata(dev);
+
+ if (!priv->fan_tach_present[index])
+ return 0;
+ return a->mode;
+}
+
+static SENSOR_DEVICE_ATTR(pwm0, 0644,
+ show_pwm, set_pwm, 0);
+static SENSOR_DEVICE_ATTR(pwm1, 0644,
+ show_pwm, set_pwm, 1);
+static SENSOR_DEVICE_ATTR(pwm2, 0644,
+ show_pwm, set_pwm, 2);
+static SENSOR_DEVICE_ATTR(pwm3, 0644,
+ show_pwm, set_pwm, 3);
+static SENSOR_DEVICE_ATTR(pwm4, 0644,
+ show_pwm, set_pwm, 4);
+static SENSOR_DEVICE_ATTR(pwm5, 0644,
+ show_pwm, set_pwm, 5);
+static SENSOR_DEVICE_ATTR(pwm6, 0644,
+ show_pwm, set_pwm, 6);
+static SENSOR_DEVICE_ATTR(pwm7, 0644,
+ show_pwm, set_pwm, 7);
+static SENSOR_DEVICE_ATTR(pwm8, 0644,
+ show_pwm, set_pwm, 8);
+static SENSOR_DEVICE_ATTR(pwm9, 0644,
+ show_pwm, set_pwm, 9);
+static SENSOR_DEVICE_ATTR(pwm10, 0644,
+ show_pwm, set_pwm, 10);
+static SENSOR_DEVICE_ATTR(pwm11, 0644,
+ show_pwm, set_pwm, 11);
+static SENSOR_DEVICE_ATTR(pwm12, 0644,
+ show_pwm, set_pwm, 12);
+static SENSOR_DEVICE_ATTR(pwm13, 0644,
+ show_pwm, set_pwm, 13);
+static SENSOR_DEVICE_ATTR(pwm14, 0644,
+ show_pwm, set_pwm, 14);
+static SENSOR_DEVICE_ATTR(pwm15, 0644,
+ show_pwm, set_pwm, 15);
+static struct attribute *pwm_dev_attrs[] = {
+ &sensor_dev_attr_pwm0.dev_attr.attr,
+ &sensor_dev_attr_pwm1.dev_attr.attr,
+ &sensor_dev_attr_pwm2.dev_attr.attr,
+ &sensor_dev_attr_pwm3.dev_attr.attr,
+ &sensor_dev_attr_pwm4.dev_attr.attr,
+ &sensor_dev_attr_pwm5.dev_attr.attr,
+ &sensor_dev_attr_pwm6.dev_attr.attr,
+ &sensor_dev_attr_pwm7.dev_attr.attr,
+ &sensor_dev_attr_pwm8.dev_attr.attr,
+ &sensor_dev_attr_pwm9.dev_attr.attr,
+ &sensor_dev_attr_pwm10.dev_attr.attr,
+ &sensor_dev_attr_pwm11.dev_attr.attr,
+ &sensor_dev_attr_pwm12.dev_attr.attr,
+ &sensor_dev_attr_pwm13.dev_attr.attr,
+ &sensor_dev_attr_pwm14.dev_attr.attr,
+ &sensor_dev_attr_pwm15.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group pwm_dev_group = {
+ .attrs = pwm_dev_attrs,
+ .is_visible = pwm_is_visible,
+};
+
+static SENSOR_DEVICE_ATTR(fan0_input, 0444,
+ show_rpm, NULL, 0);
+static SENSOR_DEVICE_ATTR(fan1_input, 0444,
+ show_rpm, NULL, 1);
+static SENSOR_DEVICE_ATTR(fan2_input, 0444,
+ show_rpm, NULL, 2);
+static SENSOR_DEVICE_ATTR(fan3_input, 0444,
+ show_rpm, NULL, 3);
+static SENSOR_DEVICE_ATTR(fan4_input, 0444,
+ show_rpm, NULL, 4);
+static SENSOR_DEVICE_ATTR(fan5_input, 0444,
+ show_rpm, NULL, 5);
+static SENSOR_DEVICE_ATTR(fan6_input, 0444,
+ show_rpm, NULL, 6);
+static SENSOR_DEVICE_ATTR(fan7_input, 0444,
+ show_rpm, NULL, 7);
+static SENSOR_DEVICE_ATTR(fan8_input, 0444,
+ show_rpm, NULL, 8);
+static SENSOR_DEVICE_ATTR(fan9_input, 0444,
+ show_rpm, NULL, 9);
+static SENSOR_DEVICE_ATTR(fan10_input, 0444,
+ show_rpm, NULL, 10);
+static SENSOR_DEVICE_ATTR(fan11_input, 0444,
+ show_rpm, NULL, 11);
+static SENSOR_DEVICE_ATTR(fan12_input, 0444,
+ show_rpm, NULL, 12);
+static SENSOR_DEVICE_ATTR(fan13_input, 0444,
+ show_rpm, NULL, 13);
+static SENSOR_DEVICE_ATTR(fan14_input, 0444,
+ show_rpm, NULL, 14);
+static SENSOR_DEVICE_ATTR(fan15_input, 0444,
+ show_rpm, NULL, 15);
+static struct attribute *fan_dev_attrs[] = {
+ &sensor_dev_attr_fan0_input.dev_attr.attr,
+ &sensor_dev_attr_fan1_input.dev_attr.attr,
+ &sensor_dev_attr_fan2_input.dev_attr.attr,
+ &sensor_dev_attr_fan3_input.dev_attr.attr,
+ &sensor_dev_attr_fan4_input.dev_attr.attr,
+ &sensor_dev_attr_fan5_input.dev_attr.attr,
+ &sensor_dev_attr_fan6_input.dev_attr.attr,
+ &sensor_dev_attr_fan7_input.dev_attr.attr,
+ &sensor_dev_attr_fan8_input.dev_attr.attr,
+ &sensor_dev_attr_fan9_input.dev_attr.attr,
+ &sensor_dev_attr_fan10_input.dev_attr.attr,
+ &sensor_dev_attr_fan11_input.dev_attr.attr,
+ &sensor_dev_attr_fan12_input.dev_attr.attr,
+ &sensor_dev_attr_fan13_input.dev_attr.attr,
+ &sensor_dev_attr_fan14_input.dev_attr.attr,
+ &sensor_dev_attr_fan15_input.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group fan_dev_group = {
+ .attrs = fan_dev_attrs,
+ .is_visible = fan_dev_is_visible,
+};
+
+static void aspeed_create_pwm_channel(struct device *dev, struct aspeed_pwm_tachometer_data *priv,
+ u8 pwm_channel, u32 target_pwm_freq)
+{
+ priv->pwm_present[pwm_channel] = true;
+ priv->pwm_channel[pwm_channel].target_freq = target_pwm_freq;
+
+ //use default
+ aspeed_set_pwm_channel_fan_ctrl(dev,
+ priv,
+ pwm_channel,
+ priv->pwm_channel[pwm_channel].falling);
+}
+
+static void aspeed_create_fan_tach_channel(struct aspeed_pwm_tachometer_data *priv,
+ u8 *fan_tach_ch, int count,
+ u32 fan_pulse_pr, u32 tacho_div)
+{
+ u8 val, index;
+
+ for (val = 0; val < count; val++) {
+ index = fan_tach_ch[val];
+ priv->fan_tach_present[index] = true;
+ priv->tacho_channel[index].pulse_pr = fan_pulse_pr;
+ aspeed_set_fan_tach_ch_enable(priv, index, true, tacho_div);
+ }
+}
+
+static int
+aspeed_pwm_cz_get_max_state(struct thermal_cooling_device *tcdev,
+ unsigned long *state)
+{
+ struct aspeed_cooling_device *cdev = tcdev->devdata;
+
+ *state = cdev->max_state;
+
+ return 0;
+}
+
+static int
+aspeed_pwm_cz_get_cur_state(struct thermal_cooling_device *tcdev,
+ unsigned long *state)
+{
+ struct aspeed_cooling_device *cdev = tcdev->devdata;
+
+ *state = cdev->cur_state;
+
+ return 0;
+}
+
+static int
+aspeed_pwm_cz_set_cur_state(struct thermal_cooling_device *tcdev,
+ unsigned long state)
+{
+ struct aspeed_cooling_device *cdev = tcdev->devdata;
+
+ if (state > cdev->max_state)
+ return -EINVAL;
+
+ cdev->cur_state = state;
+ cdev->priv->pwm_channel[cdev->pwm_channel].falling =
+ cdev->cooling_levels[cdev->cur_state];
+ aspeed_set_pwm_channel_fan_ctrl(&tcdev->device, cdev->priv, cdev->pwm_channel,
+ cdev->cooling_levels[cdev->cur_state]);
+
+ return 0;
+}
+
+static const struct thermal_cooling_device_ops aspeed_pwm_cool_ops = {
+ .get_max_state = aspeed_pwm_cz_get_max_state,
+ .get_cur_state = aspeed_pwm_cz_get_cur_state,
+ .set_cur_state = aspeed_pwm_cz_set_cur_state,
+};
+
+static int aspeed_create_pwm_cooling(struct device *dev,
+ struct device_node *child,
+ struct aspeed_pwm_tachometer_data *priv,
+ u32 pwm_channel, u8 num_levels)
+{
+ int ret;
+ struct aspeed_cooling_device *cdev;
+
+ cdev = devm_kzalloc(dev, sizeof(*cdev), GFP_KERNEL);
+ if (!cdev)
+ return -ENOMEM;
+
+ cdev->cooling_levels = devm_kzalloc(dev, num_levels, GFP_KERNEL);
+ if (!cdev->cooling_levels)
+ return -ENOMEM;
+
+ cdev->max_state = num_levels - 1;
+ ret = of_property_read_u8_array(child, "cooling-levels",
+ cdev->cooling_levels,
+ num_levels);
+ if (ret) {
+ dev_err(dev, "Property 'cooling-levels' cannot be read.\n");
+ return ret;
+ }
+ snprintf(cdev->name, MAX_CDEV_NAME_LEN, "%s%d", child->name, pwm_channel);
+
+ cdev->tcdev = thermal_of_cooling_device_register(child,
+ cdev->name,
+ cdev,
+ &aspeed_pwm_cool_ops);
+ if (IS_ERR(cdev->tcdev))
+ return PTR_ERR(cdev->tcdev);
+
+ cdev->priv = priv;
+ cdev->pwm_channel = pwm_channel;
+
+ priv->cdev[pwm_channel] = cdev;
+
+ return 0;
+}
+
+static int aspeed_pwm_create_fan(struct device *dev,
+ struct device_node *child,
+ struct aspeed_pwm_tachometer_data *priv)
+{
+ u8 *fan_tach_ch;
+ u32 fan_pulse_pr;
+ u32 tacho_div;
+ u32 pwm_channel;
+ u32 target_pwm_freq = 0;
+ int ret, count;
+
+ ret = of_property_read_u32(child, "reg", &pwm_channel);
+ if (ret)
+ return ret;
+
+ ret = of_property_read_u32(child, "aspeed,pwm-freq", &target_pwm_freq);
+ if (ret)
+ target_pwm_freq = DEFAULT_TARGET_PWM_FREQ;
+
+ aspeed_create_pwm_channel(dev, priv, (u8)pwm_channel, target_pwm_freq);
+
+ ret = of_property_count_u8_elems(child, "cooling-levels");
+ if (ret > 0) {
+ if (IS_ENABLED(CONFIG_THERMAL)) {
+ ret = aspeed_create_pwm_cooling(dev, child, priv, pwm_channel,
+ ret);
+ if (ret)
+ return ret;
+ }
+ }
+
+ count = of_property_count_u8_elems(child, "aspeed,fan-tach-ch");
+ if (count < 1)
+ return -EINVAL;
+
+ fan_tach_ch = devm_kzalloc(dev, sizeof(*fan_tach_ch) * count,
+ GFP_KERNEL);
+ if (!fan_tach_ch)
+ return -ENOMEM;
+ ret = of_property_read_u8_array(child, "aspeed,fan-tach-ch",
+ fan_tach_ch, count);
+ if (ret)
+ return ret;
+
+ ret = of_property_read_u32(child, "aspeed,pulse-pr", &fan_pulse_pr);
+ if (ret)
+ fan_pulse_pr = DEFAULT_FAN_PULSE_PR;
+
+ ret = of_property_read_u32(child, "aspeed,tacho-div", &tacho_div);
+ if (ret)
+ tacho_div = DEFAULT_TACHO_DIV;
+
+ aspeed_create_fan_tach_channel(priv, fan_tach_ch, count, fan_pulse_pr, tacho_div);
+
+ return 0;
+}
+
+static int aspeed_pwm_tachometer_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np, *child;
+ struct aspeed_pwm_tachometer_data *priv;
+ void __iomem *regs;
+ struct resource *res;
+ struct device *hwmon;
+ struct clk *clk;
+ int ret;
+
+ np = dev->of_node;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENOENT;
+ regs = devm_ioremap_resource(dev, res);
+ if (IS_ERR(regs))
+ return PTR_ERR(regs);
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->pwm_channel = default_pwm_params;
+ priv->tacho_channel = default_tacho_params;
+ priv->regmap = devm_regmap_init(dev, NULL, (__force void *)regs,
+ &aspeed_pwm_tachometer_regmap_config);
+ if (IS_ERR(priv->regmap))
+ return PTR_ERR(priv->regmap);
+
+ clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(clk))
+ return -ENODEV;
+ priv->clk_freq = clk_get_rate(clk);
+
+ priv->reset = devm_reset_control_get(&pdev->dev, NULL);
+ if (IS_ERR(priv->reset)) {
+ dev_err(&pdev->dev, "can't get aspeed_pwm_tacho reset\n");
+ return PTR_ERR(priv->reset);
+ }
+
+ //scu init
+ reset_control_assert(priv->reset);
+ reset_control_deassert(priv->reset);
+
+ for_each_child_of_node(np, child) {
+ ret = aspeed_pwm_create_fan(dev, child, priv);
+ if (ret) {
+ of_node_put(child);
+ return ret;
+ }
+ }
+
+ priv->groups[0] = &pwm_dev_group;
+ priv->groups[1] = &fan_dev_group;
+ priv->groups[2] = NULL;
+ dev_info(dev, "pwm tach probe done\n");
+ hwmon = devm_hwmon_device_register_with_groups(dev,
+ "aspeed_pwm_tachometer",
+ priv, priv->groups);
+
+ return PTR_ERR_OR_ZERO(hwmon);
+}
+
+static const struct of_device_id of_pwm_tachometer_match_table[] = {
+ { .compatible = "aspeed,ast2600-pwm-tachometer", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, of_pwm_tachometer_match_table);
+
+static struct platform_driver aspeed_pwm_tachometer_driver = {
+ .probe = aspeed_pwm_tachometer_probe,
+ .driver = {
+ .name = "aspeed_pwm_tachometer",
+ .of_match_table = of_pwm_tachometer_match_table,
+ },
+};
+
+module_platform_driver(aspeed_pwm_tachometer_driver);
+
+MODULE_AUTHOR("Ryan Chen <ryan_chen at aspeedtech.com>");
+MODULE_DESCRIPTION("ASPEED PWM and Fan Tachometer device driver");
+MODULE_LICENSE("GPL");
--
2.17.1
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