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linux-stable/drivers/hwmon/aspeed-pwm-tacho.c
Paul Fertser 3b1ea71fac hwmon: (aspeed-pwm-tacho) increase fan tach period (again) 
The old value allows measuring fan speeds down to about 970 RPM and
gives timeout for anything less than that. It is problematic because it
can also be used as an indicator for fan failure or absence.

Despite having read the relevant section of "ASPEED AST2500/AST2520 A2
Datasheet – V1.7" multiple times I wasn't able to figure out what
exactly "fan tach period" and "fan tach falling point of period" mean
(both are set by the driver from the constant this patch is amending).

Experimentation with a Tioga Pass OCP board (AST2500 BMC) showed that
value of 0x0108 gives time outs for speeds below 1500 RPM and the value
offered by the patch is good for at least 750 RPM (the fans can't spin
any slower so the lower bound is unknown). Measuring with the fans
spinning takes about 30 ms, sometimes down to 18 ms, so about the same
as with the previous value.

This constant was last changed with commit 762b1e8880 ("hwmon:
(aspeed-pwm-tacho) increase fan tach period")

Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Link: https://lore.kernel.org/r/20220714142344.27071-1-fercerpav@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2022-07-21 07:15:55 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2016 Google, Inc
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/gpio/consumer.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_device.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/sysfs.h>
#include <linux/thermal.h>
/* ASPEED PWM & FAN Tach Register Definition */
#define ASPEED_PTCR_CTRL 0x00
#define ASPEED_PTCR_CLK_CTRL 0x04
#define ASPEED_PTCR_DUTY0_CTRL 0x08
#define ASPEED_PTCR_DUTY1_CTRL 0x0c
#define ASPEED_PTCR_TYPEM_CTRL 0x10
#define ASPEED_PTCR_TYPEM_CTRL1 0x14
#define ASPEED_PTCR_TYPEN_CTRL 0x18
#define ASPEED_PTCR_TYPEN_CTRL1 0x1c
#define ASPEED_PTCR_TACH_SOURCE 0x20
#define ASPEED_PTCR_TRIGGER 0x28
#define ASPEED_PTCR_RESULT 0x2c
#define ASPEED_PTCR_INTR_CTRL 0x30
#define ASPEED_PTCR_INTR_STS 0x34
#define ASPEED_PTCR_TYPEM_LIMIT 0x38
#define ASPEED_PTCR_TYPEN_LIMIT 0x3C
#define ASPEED_PTCR_CTRL_EXT 0x40
#define ASPEED_PTCR_CLK_CTRL_EXT 0x44
#define ASPEED_PTCR_DUTY2_CTRL 0x48
#define ASPEED_PTCR_DUTY3_CTRL 0x4c
#define ASPEED_PTCR_TYPEO_CTRL 0x50
#define ASPEED_PTCR_TYPEO_CTRL1 0x54
#define ASPEED_PTCR_TACH_SOURCE_EXT 0x60
#define ASPEED_PTCR_TYPEO_LIMIT 0x78
/* ASPEED_PTCR_CTRL : 0x00 - General Control Register */
#define ASPEED_PTCR_CTRL_SET_PWMD_TYPE_PART1 15
#define ASPEED_PTCR_CTRL_SET_PWMD_TYPE_PART2 6
#define ASPEED_PTCR_CTRL_SET_PWMD_TYPE_MASK (BIT(7) | BIT(15))
#define ASPEED_PTCR_CTRL_SET_PWMC_TYPE_PART1 14
#define ASPEED_PTCR_CTRL_SET_PWMC_TYPE_PART2 5
#define ASPEED_PTCR_CTRL_SET_PWMC_TYPE_MASK (BIT(6) | BIT(14))
#define ASPEED_PTCR_CTRL_SET_PWMB_TYPE_PART1 13
#define ASPEED_PTCR_CTRL_SET_PWMB_TYPE_PART2 4
#define ASPEED_PTCR_CTRL_SET_PWMB_TYPE_MASK (BIT(5) | BIT(13))
#define ASPEED_PTCR_CTRL_SET_PWMA_TYPE_PART1 12
#define ASPEED_PTCR_CTRL_SET_PWMA_TYPE_PART2 3
#define ASPEED_PTCR_CTRL_SET_PWMA_TYPE_MASK (BIT(4) | BIT(12))
#define ASPEED_PTCR_CTRL_FAN_NUM_EN(x) BIT(16 + (x))
#define ASPEED_PTCR_CTRL_PWMD_EN BIT(11)
#define ASPEED_PTCR_CTRL_PWMC_EN BIT(10)
#define ASPEED_PTCR_CTRL_PWMB_EN BIT(9)
#define ASPEED_PTCR_CTRL_PWMA_EN BIT(8)
#define ASPEED_PTCR_CTRL_CLK_SRC BIT(1)
#define ASPEED_PTCR_CTRL_CLK_EN BIT(0)
/* ASPEED_PTCR_CLK_CTRL : 0x04 - Clock Control Register */
/* TYPE N */
#define ASPEED_PTCR_CLK_CTRL_TYPEN_MASK GENMASK(31, 16)
#define ASPEED_PTCR_CLK_CTRL_TYPEN_UNIT 24
#define ASPEED_PTCR_CLK_CTRL_TYPEN_H 20
#define ASPEED_PTCR_CLK_CTRL_TYPEN_L 16
/* TYPE M */
#define ASPEED_PTCR_CLK_CTRL_TYPEM_MASK GENMASK(15, 0)
#define ASPEED_PTCR_CLK_CTRL_TYPEM_UNIT 8
#define ASPEED_PTCR_CLK_CTRL_TYPEM_H 4
#define ASPEED_PTCR_CLK_CTRL_TYPEM_L 0
/*
* ASPEED_PTCR_DUTY_CTRL/1/2/3 : 0x08/0x0C/0x48/0x4C - PWM-FAN duty control
* 0/1/2/3 register
*/
#define DUTY_CTRL_PWM2_FALL_POINT 24
#define DUTY_CTRL_PWM2_RISE_POINT 16
#define DUTY_CTRL_PWM2_RISE_FALL_MASK GENMASK(31, 16)
#define DUTY_CTRL_PWM1_FALL_POINT 8
#define DUTY_CTRL_PWM1_RISE_POINT 0
#define DUTY_CTRL_PWM1_RISE_FALL_MASK GENMASK(15, 0)
/* ASPEED_PTCR_TYPEM_CTRL : 0x10/0x18/0x50 - Type M/N/O Ctrl 0 Register */
#define TYPE_CTRL_FAN_MASK (GENMASK(5, 1) | GENMASK(31, 16))
#define TYPE_CTRL_FAN1_MASK GENMASK(31, 0)
#define TYPE_CTRL_FAN_PERIOD 16
#define TYPE_CTRL_FAN_MODE 4
#define TYPE_CTRL_FAN_DIVISION 1
#define TYPE_CTRL_FAN_TYPE_EN 1
/* ASPEED_PTCR_TACH_SOURCE : 0x20/0x60 - Tach Source Register */
/* bit [0,1] at 0x20, bit [2] at 0x60 */
#define TACH_PWM_SOURCE_BIT01(x) ((x) * 2)
#define TACH_PWM_SOURCE_BIT2(x) ((x) * 2)
#define TACH_PWM_SOURCE_MASK_BIT01(x) (0x3 << ((x) * 2))
#define TACH_PWM_SOURCE_MASK_BIT2(x) BIT((x) * 2)
/* ASPEED_PTCR_RESULT : 0x2c - Result Register */
#define RESULT_STATUS_MASK BIT(31)
#define RESULT_VALUE_MASK 0xfffff
/* ASPEED_PTCR_CTRL_EXT : 0x40 - General Control Extension #1 Register */
#define ASPEED_PTCR_CTRL_SET_PWMH_TYPE_PART1 15
#define ASPEED_PTCR_CTRL_SET_PWMH_TYPE_PART2 6
#define ASPEED_PTCR_CTRL_SET_PWMH_TYPE_MASK (BIT(7) | BIT(15))
#define ASPEED_PTCR_CTRL_SET_PWMG_TYPE_PART1 14
#define ASPEED_PTCR_CTRL_SET_PWMG_TYPE_PART2 5
#define ASPEED_PTCR_CTRL_SET_PWMG_TYPE_MASK (BIT(6) | BIT(14))
#define ASPEED_PTCR_CTRL_SET_PWMF_TYPE_PART1 13
#define ASPEED_PTCR_CTRL_SET_PWMF_TYPE_PART2 4
#define ASPEED_PTCR_CTRL_SET_PWMF_TYPE_MASK (BIT(5) | BIT(13))
#define ASPEED_PTCR_CTRL_SET_PWME_TYPE_PART1 12
#define ASPEED_PTCR_CTRL_SET_PWME_TYPE_PART2 3
#define ASPEED_PTCR_CTRL_SET_PWME_TYPE_MASK (BIT(4) | BIT(12))
#define ASPEED_PTCR_CTRL_PWMH_EN BIT(11)
#define ASPEED_PTCR_CTRL_PWMG_EN BIT(10)
#define ASPEED_PTCR_CTRL_PWMF_EN BIT(9)
#define ASPEED_PTCR_CTRL_PWME_EN BIT(8)
/* ASPEED_PTCR_CLK_EXT_CTRL : 0x44 - Clock Control Extension #1 Register */
/* TYPE O */
#define ASPEED_PTCR_CLK_CTRL_TYPEO_MASK GENMASK(15, 0)
#define ASPEED_PTCR_CLK_CTRL_TYPEO_UNIT 8
#define ASPEED_PTCR_CLK_CTRL_TYPEO_H 4
#define ASPEED_PTCR_CLK_CTRL_TYPEO_L 0
#define PWM_MAX 255
#define BOTH_EDGES 0x02 /* 10b */
#define M_PWM_DIV_H 0x00
#define M_PWM_DIV_L 0x05
#define M_PWM_PERIOD 0x5F
#define M_TACH_CLK_DIV 0x00
/*
* 5:4 Type N fan tach mode selection bit:
* 00: falling
* 01: rising
* 10: both
* 11: reserved.
*/
#define M_TACH_MODE 0x02 /* 10b */
#define M_TACH_UNIT 0x0420
#define INIT_FAN_CTRL 0xFF
/* How long we sleep in us while waiting for an RPM result. */
#define ASPEED_RPM_STATUS_SLEEP_USEC 500
#define MAX_CDEV_NAME_LEN 16
struct aspeed_cooling_device {
char name[16];
struct aspeed_pwm_tacho_data *priv;
struct thermal_cooling_device *tcdev;
int pwm_port;
u8 *cooling_levels;
u8 max_state;
u8 cur_state;
};
struct aspeed_pwm_tacho_data {
struct regmap *regmap;
struct reset_control *rst;
unsigned long clk_freq;
bool pwm_present[8];
bool fan_tach_present[16];
u8 type_pwm_clock_unit[3];
u8 type_pwm_clock_division_h[3];
u8 type_pwm_clock_division_l[3];
u8 type_fan_tach_clock_division[3];
u8 type_fan_tach_mode[3];
u16 type_fan_tach_unit[3];
u8 pwm_port_type[8];
u8 pwm_port_fan_ctrl[8];
u8 fan_tach_ch_source[16];
struct aspeed_cooling_device *cdev[8];
const struct attribute_group *groups[3];
};
enum type { TYPEM, TYPEN, TYPEO };
struct type_params {
u32 l_value;
u32 h_value;
u32 unit_value;
u32 clk_ctrl_mask;
u32 clk_ctrl_reg;
u32 ctrl_reg;
u32 ctrl_reg1;
};
static const struct type_params type_params[] = {
[TYPEM] = {
.l_value = ASPEED_PTCR_CLK_CTRL_TYPEM_L,
.h_value = ASPEED_PTCR_CLK_CTRL_TYPEM_H,
.unit_value = ASPEED_PTCR_CLK_CTRL_TYPEM_UNIT,
.clk_ctrl_mask = ASPEED_PTCR_CLK_CTRL_TYPEM_MASK,
.clk_ctrl_reg = ASPEED_PTCR_CLK_CTRL,
.ctrl_reg = ASPEED_PTCR_TYPEM_CTRL,
.ctrl_reg1 = ASPEED_PTCR_TYPEM_CTRL1,
},
[TYPEN] = {
.l_value = ASPEED_PTCR_CLK_CTRL_TYPEN_L,
.h_value = ASPEED_PTCR_CLK_CTRL_TYPEN_H,
.unit_value = ASPEED_PTCR_CLK_CTRL_TYPEN_UNIT,
.clk_ctrl_mask = ASPEED_PTCR_CLK_CTRL_TYPEN_MASK,
.clk_ctrl_reg = ASPEED_PTCR_CLK_CTRL,
.ctrl_reg = ASPEED_PTCR_TYPEN_CTRL,
.ctrl_reg1 = ASPEED_PTCR_TYPEN_CTRL1,
},
[TYPEO] = {
.l_value = ASPEED_PTCR_CLK_CTRL_TYPEO_L,
.h_value = ASPEED_PTCR_CLK_CTRL_TYPEO_H,
.unit_value = ASPEED_PTCR_CLK_CTRL_TYPEO_UNIT,
.clk_ctrl_mask = ASPEED_PTCR_CLK_CTRL_TYPEO_MASK,
.clk_ctrl_reg = ASPEED_PTCR_CLK_CTRL_EXT,
.ctrl_reg = ASPEED_PTCR_TYPEO_CTRL,
.ctrl_reg1 = ASPEED_PTCR_TYPEO_CTRL1,
}
};
enum pwm_port { PWMA, PWMB, PWMC, PWMD, PWME, PWMF, PWMG, PWMH };
struct pwm_port_params {
u32 pwm_en;
u32 ctrl_reg;
u32 type_part1;
u32 type_part2;
u32 type_mask;
u32 duty_ctrl_rise_point;
u32 duty_ctrl_fall_point;
u32 duty_ctrl_reg;
u32 duty_ctrl_rise_fall_mask;
};
static const struct pwm_port_params pwm_port_params[] = {
[PWMA] = {
.pwm_en = ASPEED_PTCR_CTRL_PWMA_EN,
.ctrl_reg = ASPEED_PTCR_CTRL,
.type_part1 = ASPEED_PTCR_CTRL_SET_PWMA_TYPE_PART1,
.type_part2 = ASPEED_PTCR_CTRL_SET_PWMA_TYPE_PART2,
.type_mask = ASPEED_PTCR_CTRL_SET_PWMA_TYPE_MASK,
.duty_ctrl_rise_point = DUTY_CTRL_PWM1_RISE_POINT,
.duty_ctrl_fall_point = DUTY_CTRL_PWM1_FALL_POINT,
.duty_ctrl_reg = ASPEED_PTCR_DUTY0_CTRL,
.duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM1_RISE_FALL_MASK,
},
[PWMB] = {
.pwm_en = ASPEED_PTCR_CTRL_PWMB_EN,
.ctrl_reg = ASPEED_PTCR_CTRL,
.type_part1 = ASPEED_PTCR_CTRL_SET_PWMB_TYPE_PART1,
.type_part2 = ASPEED_PTCR_CTRL_SET_PWMB_TYPE_PART2,
.type_mask = ASPEED_PTCR_CTRL_SET_PWMB_TYPE_MASK,
.duty_ctrl_rise_point = DUTY_CTRL_PWM2_RISE_POINT,
.duty_ctrl_fall_point = DUTY_CTRL_PWM2_FALL_POINT,
.duty_ctrl_reg = ASPEED_PTCR_DUTY0_CTRL,
.duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM2_RISE_FALL_MASK,
},
[PWMC] = {
.pwm_en = ASPEED_PTCR_CTRL_PWMC_EN,
.ctrl_reg = ASPEED_PTCR_CTRL,
.type_part1 = ASPEED_PTCR_CTRL_SET_PWMC_TYPE_PART1,
.type_part2 = ASPEED_PTCR_CTRL_SET_PWMC_TYPE_PART2,
.type_mask = ASPEED_PTCR_CTRL_SET_PWMC_TYPE_MASK,
.duty_ctrl_rise_point = DUTY_CTRL_PWM1_RISE_POINT,
.duty_ctrl_fall_point = DUTY_CTRL_PWM1_FALL_POINT,
.duty_ctrl_reg = ASPEED_PTCR_DUTY1_CTRL,
.duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM1_RISE_FALL_MASK,
},
[PWMD] = {
.pwm_en = ASPEED_PTCR_CTRL_PWMD_EN,
.ctrl_reg = ASPEED_PTCR_CTRL,
.type_part1 = ASPEED_PTCR_CTRL_SET_PWMD_TYPE_PART1,
.type_part2 = ASPEED_PTCR_CTRL_SET_PWMD_TYPE_PART2,
.type_mask = ASPEED_PTCR_CTRL_SET_PWMD_TYPE_MASK,
.duty_ctrl_rise_point = DUTY_CTRL_PWM2_RISE_POINT,
.duty_ctrl_fall_point = DUTY_CTRL_PWM2_FALL_POINT,
.duty_ctrl_reg = ASPEED_PTCR_DUTY1_CTRL,
.duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM2_RISE_FALL_MASK,
},
[PWME] = {
.pwm_en = ASPEED_PTCR_CTRL_PWME_EN,
.ctrl_reg = ASPEED_PTCR_CTRL_EXT,
.type_part1 = ASPEED_PTCR_CTRL_SET_PWME_TYPE_PART1,
.type_part2 = ASPEED_PTCR_CTRL_SET_PWME_TYPE_PART2,
.type_mask = ASPEED_PTCR_CTRL_SET_PWME_TYPE_MASK,
.duty_ctrl_rise_point = DUTY_CTRL_PWM1_RISE_POINT,
.duty_ctrl_fall_point = DUTY_CTRL_PWM1_FALL_POINT,
.duty_ctrl_reg = ASPEED_PTCR_DUTY2_CTRL,
.duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM1_RISE_FALL_MASK,
},
[PWMF] = {
.pwm_en = ASPEED_PTCR_CTRL_PWMF_EN,
.ctrl_reg = ASPEED_PTCR_CTRL_EXT,
.type_part1 = ASPEED_PTCR_CTRL_SET_PWMF_TYPE_PART1,
.type_part2 = ASPEED_PTCR_CTRL_SET_PWMF_TYPE_PART2,
.type_mask = ASPEED_PTCR_CTRL_SET_PWMF_TYPE_MASK,
.duty_ctrl_rise_point = DUTY_CTRL_PWM2_RISE_POINT,
.duty_ctrl_fall_point = DUTY_CTRL_PWM2_FALL_POINT,
.duty_ctrl_reg = ASPEED_PTCR_DUTY2_CTRL,
.duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM2_RISE_FALL_MASK,
},
[PWMG] = {
.pwm_en = ASPEED_PTCR_CTRL_PWMG_EN,
.ctrl_reg = ASPEED_PTCR_CTRL_EXT,
.type_part1 = ASPEED_PTCR_CTRL_SET_PWMG_TYPE_PART1,
.type_part2 = ASPEED_PTCR_CTRL_SET_PWMG_TYPE_PART2,
.type_mask = ASPEED_PTCR_CTRL_SET_PWMG_TYPE_MASK,
.duty_ctrl_rise_point = DUTY_CTRL_PWM1_RISE_POINT,
.duty_ctrl_fall_point = DUTY_CTRL_PWM1_FALL_POINT,
.duty_ctrl_reg = ASPEED_PTCR_DUTY3_CTRL,
.duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM1_RISE_FALL_MASK,
},
[PWMH] = {
.pwm_en = ASPEED_PTCR_CTRL_PWMH_EN,
.ctrl_reg = ASPEED_PTCR_CTRL_EXT,
.type_part1 = ASPEED_PTCR_CTRL_SET_PWMH_TYPE_PART1,
.type_part2 = ASPEED_PTCR_CTRL_SET_PWMH_TYPE_PART2,
.type_mask = ASPEED_PTCR_CTRL_SET_PWMH_TYPE_MASK,
.duty_ctrl_rise_point = DUTY_CTRL_PWM2_RISE_POINT,
.duty_ctrl_fall_point = DUTY_CTRL_PWM2_FALL_POINT,
.duty_ctrl_reg = ASPEED_PTCR_DUTY3_CTRL,
.duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM2_RISE_FALL_MASK,
}
};
static int regmap_aspeed_pwm_tacho_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_tacho_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_tacho_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = ASPEED_PTCR_TYPEO_LIMIT,
.reg_write = regmap_aspeed_pwm_tacho_reg_write,
.reg_read = regmap_aspeed_pwm_tacho_reg_read,
.fast_io = true,
};
static void aspeed_set_clock_enable(struct regmap *regmap, bool val)
{
regmap_update_bits(regmap, ASPEED_PTCR_CTRL,
ASPEED_PTCR_CTRL_CLK_EN,
val ? ASPEED_PTCR_CTRL_CLK_EN : 0);
}
static void aspeed_set_clock_source(struct regmap *regmap, int val)
{
regmap_update_bits(regmap, ASPEED_PTCR_CTRL,
ASPEED_PTCR_CTRL_CLK_SRC,
val ? ASPEED_PTCR_CTRL_CLK_SRC : 0);
}
static void aspeed_set_pwm_clock_values(struct regmap *regmap, u8 type,
u8 div_high, u8 div_low, u8 unit)
{
u32 reg_value = ((div_high << type_params[type].h_value) |
(div_low << type_params[type].l_value) |
(unit << type_params[type].unit_value));
regmap_update_bits(regmap, type_params[type].clk_ctrl_reg,
type_params[type].clk_ctrl_mask, reg_value);
}
static void aspeed_set_pwm_port_enable(struct regmap *regmap, u8 pwm_port,
bool enable)
{
regmap_update_bits(regmap, pwm_port_params[pwm_port].ctrl_reg,
pwm_port_params[pwm_port].pwm_en,
enable ? pwm_port_params[pwm_port].pwm_en : 0);
}
static void aspeed_set_pwm_port_type(struct regmap *regmap,
u8 pwm_port, u8 type)
{
u32 reg_value = (type & 0x1) << pwm_port_params[pwm_port].type_part1;
reg_value |= (type & 0x2) << pwm_port_params[pwm_port].type_part2;
regmap_update_bits(regmap, pwm_port_params[pwm_port].ctrl_reg,
pwm_port_params[pwm_port].type_mask, reg_value);
}
static void aspeed_set_pwm_port_duty_rising_falling(struct regmap *regmap,
u8 pwm_port, u8 rising,
u8 falling)
{
u32 reg_value = (rising <<
pwm_port_params[pwm_port].duty_ctrl_rise_point);
reg_value |= (falling <<
pwm_port_params[pwm_port].duty_ctrl_fall_point);
regmap_update_bits(regmap, pwm_port_params[pwm_port].duty_ctrl_reg,
pwm_port_params[pwm_port].duty_ctrl_rise_fall_mask,
reg_value);
}
static void aspeed_set_tacho_type_enable(struct regmap *regmap, u8 type,
bool enable)
{
regmap_update_bits(regmap, type_params[type].ctrl_reg,
TYPE_CTRL_FAN_TYPE_EN,
enable ? TYPE_CTRL_FAN_TYPE_EN : 0);
}
static void aspeed_set_tacho_type_values(struct regmap *regmap, u8 type,
u8 mode, u16 unit, u8 division)
{
u32 reg_value = ((mode << TYPE_CTRL_FAN_MODE) |
(unit << TYPE_CTRL_FAN_PERIOD) |
(division << TYPE_CTRL_FAN_DIVISION));
regmap_update_bits(regmap, type_params[type].ctrl_reg,
TYPE_CTRL_FAN_MASK, reg_value);
regmap_update_bits(regmap, type_params[type].ctrl_reg1,
TYPE_CTRL_FAN1_MASK, unit << 16);
}
static void aspeed_set_fan_tach_ch_enable(struct regmap *regmap, u8 fan_tach_ch,
bool enable)
{
regmap_update_bits(regmap, ASPEED_PTCR_CTRL,
ASPEED_PTCR_CTRL_FAN_NUM_EN(fan_tach_ch),
enable ?
ASPEED_PTCR_CTRL_FAN_NUM_EN(fan_tach_ch) : 0);
}
static void aspeed_set_fan_tach_ch_source(struct regmap *regmap, u8 fan_tach_ch,
u8 fan_tach_ch_source)
{
u32 reg_value1 = ((fan_tach_ch_source & 0x3) <<
TACH_PWM_SOURCE_BIT01(fan_tach_ch));
u32 reg_value2 = (((fan_tach_ch_source & 0x4) >> 2) <<
TACH_PWM_SOURCE_BIT2(fan_tach_ch));
regmap_update_bits(regmap, ASPEED_PTCR_TACH_SOURCE,
TACH_PWM_SOURCE_MASK_BIT01(fan_tach_ch),
reg_value1);
regmap_update_bits(regmap, ASPEED_PTCR_TACH_SOURCE_EXT,
TACH_PWM_SOURCE_MASK_BIT2(fan_tach_ch),
reg_value2);
}
static void aspeed_set_pwm_port_fan_ctrl(struct aspeed_pwm_tacho_data *priv,
u8 index, u8 fan_ctrl)
{
u16 period, dc_time_on;
period = priv->type_pwm_clock_unit[priv->pwm_port_type[index]];
period += 1;
dc_time_on = (fan_ctrl * period) / PWM_MAX;
if (dc_time_on == 0) {
aspeed_set_pwm_port_enable(priv->regmap, index, false);
} else {
if (dc_time_on == period)
dc_time_on = 0;
aspeed_set_pwm_port_duty_rising_falling(priv->regmap, index, 0,
dc_time_on);
aspeed_set_pwm_port_enable(priv->regmap, index, true);
}
}
static u32 aspeed_get_fan_tach_ch_measure_period(struct aspeed_pwm_tacho_data
*priv, u8 type)
{
u32 clk;
u16 tacho_unit;
u8 clk_unit, div_h, div_l, tacho_div;
clk = priv->clk_freq;
clk_unit = priv->type_pwm_clock_unit[type];
div_h = priv->type_pwm_clock_division_h[type];
div_h = 0x1 << div_h;
div_l = priv->type_pwm_clock_division_l[type];
if (div_l == 0)
div_l = 1;
else
div_l = div_l * 2;
tacho_unit = priv->type_fan_tach_unit[type];
tacho_div = priv->type_fan_tach_clock_division[type];
tacho_div = 0x4 << (tacho_div * 2);
return clk / (clk_unit * div_h * div_l * tacho_div * tacho_unit);
}
static int aspeed_get_fan_tach_ch_rpm(struct aspeed_pwm_tacho_data *priv,
u8 fan_tach_ch)
{
u32 raw_data, tach_div, clk_source, msec, usec, val;
u8 fan_tach_ch_source, type, mode, both;
int ret;
regmap_write(priv->regmap, ASPEED_PTCR_TRIGGER, 0);
regmap_write(priv->regmap, ASPEED_PTCR_TRIGGER, 0x1 << fan_tach_ch);
fan_tach_ch_source = priv->fan_tach_ch_source[fan_tach_ch];
type = priv->pwm_port_type[fan_tach_ch_source];
msec = (1000 / aspeed_get_fan_tach_ch_measure_period(priv, type));
usec = msec * 1000;
ret = regmap_read_poll_timeout(
priv->regmap,
ASPEED_PTCR_RESULT,
val,
(val & RESULT_STATUS_MASK),
ASPEED_RPM_STATUS_SLEEP_USEC,
usec);
/* return -ETIMEDOUT if we didn't get an answer. */
if (ret)
return ret;
raw_data = val & RESULT_VALUE_MASK;
tach_div = priv->type_fan_tach_clock_division[type];
/*
* We need the mode to determine if the raw_data is double (from
* counting both edges).
*/
mode = priv->type_fan_tach_mode[type];
both = (mode & BOTH_EDGES) ? 1 : 0;
tach_div = (0x4 << both) << (tach_div * 2);
clk_source = priv->clk_freq;
if (raw_data == 0)
return 0;
return (clk_source * 60) / (2 * raw_data * tach_div);
}
static ssize_t pwm_store(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_tacho_data *priv = dev_get_drvdata(dev);
long fan_ctrl;
ret = kstrtol(buf, 10, &fan_ctrl);
if (ret != 0)
return ret;
if (fan_ctrl < 0 || fan_ctrl > PWM_MAX)
return -EINVAL;
if (priv->pwm_port_fan_ctrl[index] == fan_ctrl)
return count;
priv->pwm_port_fan_ctrl[index] = fan_ctrl;
aspeed_set_pwm_port_fan_ctrl(priv, index, fan_ctrl);
return count;
}
static ssize_t pwm_show(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_tacho_data *priv = dev_get_drvdata(dev);
return sprintf(buf, "%u\n", priv->pwm_port_fan_ctrl[index]);
}
static ssize_t rpm_show(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_tacho_data *priv = dev_get_drvdata(dev);
rpm = aspeed_get_fan_tach_ch_rpm(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 = kobj_to_dev(kobj);
struct aspeed_pwm_tacho_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 = kobj_to_dev(kobj);
struct aspeed_pwm_tacho_data *priv = dev_get_drvdata(dev);
if (!priv->fan_tach_present[index])
return 0;
return a->mode;
}
static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1);
static SENSOR_DEVICE_ATTR_RW(pwm3, pwm, 2);
static SENSOR_DEVICE_ATTR_RW(pwm4, pwm, 3);
static SENSOR_DEVICE_ATTR_RW(pwm5, pwm, 4);
static SENSOR_DEVICE_ATTR_RW(pwm6, pwm, 5);
static SENSOR_DEVICE_ATTR_RW(pwm7, pwm, 6);
static SENSOR_DEVICE_ATTR_RW(pwm8, pwm, 7);
static struct attribute *pwm_dev_attrs[] = {
&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,
NULL,
};
static const struct attribute_group pwm_dev_group = {
.attrs = pwm_dev_attrs,
.is_visible = pwm_is_visible,
};
static SENSOR_DEVICE_ATTR_RO(fan1_input, rpm, 0);
static SENSOR_DEVICE_ATTR_RO(fan2_input, rpm, 1);
static SENSOR_DEVICE_ATTR_RO(fan3_input, rpm, 2);
static SENSOR_DEVICE_ATTR_RO(fan4_input, rpm, 3);
static SENSOR_DEVICE_ATTR_RO(fan5_input, rpm, 4);
static SENSOR_DEVICE_ATTR_RO(fan6_input, rpm, 5);
static SENSOR_DEVICE_ATTR_RO(fan7_input, rpm, 6);
static SENSOR_DEVICE_ATTR_RO(fan8_input, rpm, 7);
static SENSOR_DEVICE_ATTR_RO(fan9_input, rpm, 8);
static SENSOR_DEVICE_ATTR_RO(fan10_input, rpm, 9);
static SENSOR_DEVICE_ATTR_RO(fan11_input, rpm, 10);
static SENSOR_DEVICE_ATTR_RO(fan12_input, rpm, 11);
static SENSOR_DEVICE_ATTR_RO(fan13_input, rpm, 12);
static SENSOR_DEVICE_ATTR_RO(fan14_input, rpm, 13);
static SENSOR_DEVICE_ATTR_RO(fan15_input, rpm, 14);
static SENSOR_DEVICE_ATTR_RO(fan16_input, rpm, 15);
static struct attribute *fan_dev_attrs[] = {
&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,
&sensor_dev_attr_fan16_input.dev_attr.attr,
NULL
};
static const struct attribute_group fan_dev_group = {
.attrs = fan_dev_attrs,
.is_visible = fan_dev_is_visible,
};
/*
* The clock type is type M :
* The PWM frequency = 24MHz / (type M clock division L bit *
* type M clock division H bit * (type M PWM period bit + 1))
*/
static void aspeed_create_type(struct aspeed_pwm_tacho_data *priv)
{
priv->type_pwm_clock_division_h[TYPEM] = M_PWM_DIV_H;
priv->type_pwm_clock_division_l[TYPEM] = M_PWM_DIV_L;
priv->type_pwm_clock_unit[TYPEM] = M_PWM_PERIOD;
aspeed_set_pwm_clock_values(priv->regmap, TYPEM, M_PWM_DIV_H,
M_PWM_DIV_L, M_PWM_PERIOD);
aspeed_set_tacho_type_enable(priv->regmap, TYPEM, true);
priv->type_fan_tach_clock_division[TYPEM] = M_TACH_CLK_DIV;
priv->type_fan_tach_unit[TYPEM] = M_TACH_UNIT;
priv->type_fan_tach_mode[TYPEM] = M_TACH_MODE;
aspeed_set_tacho_type_values(priv->regmap, TYPEM, M_TACH_MODE,
M_TACH_UNIT, M_TACH_CLK_DIV);
}
static void aspeed_create_pwm_port(struct aspeed_pwm_tacho_data *priv,
u8 pwm_port)
{
aspeed_set_pwm_port_enable(priv->regmap, pwm_port, true);
priv->pwm_present[pwm_port] = true;
priv->pwm_port_type[pwm_port] = TYPEM;
aspeed_set_pwm_port_type(priv->regmap, pwm_port, TYPEM);
priv->pwm_port_fan_ctrl[pwm_port] = INIT_FAN_CTRL;
aspeed_set_pwm_port_fan_ctrl(priv, pwm_port, INIT_FAN_CTRL);
}
static void aspeed_create_fan_tach_channel(struct aspeed_pwm_tacho_data *priv,
u8 *fan_tach_ch,
int count,
u8 pwm_source)
{
u8 val, index;
for (val = 0; val < count; val++) {
index = fan_tach_ch[val];
aspeed_set_fan_tach_ch_enable(priv->regmap, index, true);
priv->fan_tach_present[index] = true;
priv->fan_tach_ch_source[index] = pwm_source;
aspeed_set_fan_tach_ch_source(priv->regmap, index, pwm_source);
}
}
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_port_fan_ctrl[cdev->pwm_port] =
cdev->cooling_levels[cdev->cur_state];
aspeed_set_pwm_port_fan_ctrl(cdev->priv, cdev->pwm_port,
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_tacho_data *priv,
u32 pwm_port, 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, "%pOFn%d", child, pwm_port);
cdev->tcdev = devm_thermal_of_cooling_device_register(dev, child,
cdev->name, cdev, &aspeed_pwm_cool_ops);
if (IS_ERR(cdev->tcdev))
return PTR_ERR(cdev->tcdev);
cdev->priv = priv;
cdev->pwm_port = pwm_port;
priv->cdev[pwm_port] = cdev;
return 0;
}
static int aspeed_create_fan(struct device *dev,
struct device_node *child,
struct aspeed_pwm_tacho_data *priv)
{
u8 *fan_tach_ch;
u32 pwm_port;
int ret, count;
ret = of_property_read_u32(child, "reg", &pwm_port);
if (ret)
return ret;
if (pwm_port >= ARRAY_SIZE(pwm_port_params))
return -EINVAL;
aspeed_create_pwm_port(priv, (u8)pwm_port);
ret = of_property_count_u8_elems(child, "cooling-levels");
if (ret > 0) {
ret = aspeed_create_pwm_cooling(dev, child, priv, pwm_port,
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_kcalloc(dev, count, sizeof(*fan_tach_ch),
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;
aspeed_create_fan_tach_channel(priv, fan_tach_ch, count, pwm_port);
return 0;
}
static void aspeed_pwm_tacho_remove(void *data)
{
struct aspeed_pwm_tacho_data *priv = data;
reset_control_assert(priv->rst);
}
static int aspeed_pwm_tacho_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np, *child;
struct aspeed_pwm_tacho_data *priv;
void __iomem *regs;
struct device *hwmon;
struct clk *clk;
int ret;
np = dev->of_node;
regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(regs))
return PTR_ERR(regs);
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->regmap = devm_regmap_init(dev, NULL, (__force void *)regs,
&aspeed_pwm_tacho_regmap_config);
if (IS_ERR(priv->regmap))
return PTR_ERR(priv->regmap);
priv->rst = devm_reset_control_get_exclusive(dev, NULL);
if (IS_ERR(priv->rst)) {
dev_err(dev,
"missing or invalid reset controller device tree entry");
return PTR_ERR(priv->rst);
}
reset_control_deassert(priv->rst);
ret = devm_add_action_or_reset(dev, aspeed_pwm_tacho_remove, priv);
if (ret)
return ret;
regmap_write(priv->regmap, ASPEED_PTCR_TACH_SOURCE, 0);
regmap_write(priv->regmap, ASPEED_PTCR_TACH_SOURCE_EXT, 0);
clk = devm_clk_get(dev, NULL);
if (IS_ERR(clk))
return -ENODEV;
priv->clk_freq = clk_get_rate(clk);
aspeed_set_clock_enable(priv->regmap, true);
aspeed_set_clock_source(priv->regmap, 0);
aspeed_create_type(priv);
for_each_child_of_node(np, child) {
ret = aspeed_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;
hwmon = devm_hwmon_device_register_with_groups(dev,
"aspeed_pwm_tacho",
priv, priv->groups);
return PTR_ERR_OR_ZERO(hwmon);
}
static const struct of_device_id of_pwm_tacho_match_table[] = {
{ .compatible = "aspeed,ast2400-pwm-tacho", },
{ .compatible = "aspeed,ast2500-pwm-tacho", },
{},
};
MODULE_DEVICE_TABLE(of, of_pwm_tacho_match_table);
static struct platform_driver aspeed_pwm_tacho_driver = {
.probe = aspeed_pwm_tacho_probe,
.driver = {
.name = "aspeed_pwm_tacho",
.of_match_table = of_pwm_tacho_match_table,
},
};
module_platform_driver(aspeed_pwm_tacho_driver);
MODULE_AUTHOR("Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>");
MODULE_DESCRIPTION("ASPEED PWM and Fan Tacho device driver");
MODULE_LICENSE("GPL");
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