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linux_dsm_epyc7002/drivers/hwmon/aspeed-pwm-tacho.c
Evgeny Novikov bc4071aafc hwmon: (aspeed-pwm-tacho) Avoid possible buffer overflow 
aspeed_create_fan() reads a pwm_port value using of_property_read_u32().
If pwm_port will be more than ARRAY_SIZE(pwm_port_params), there will be
a buffer overflow in
aspeed_create_pwm_port()->aspeed_set_pwm_port_enable(). The patch fixes
the potential buffer overflow.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Evgeny Novikov <novikov@ispras.ru>
Link: https://lore.kernel.org/r/20200703111518.9644-1-novikov@ispras.ru
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2020-07-05 20:45:45 -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 0x0210
#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 = container_of(kobj, struct device, 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 = container_of(kobj, struct device, 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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