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linux/drivers/hwmon/npcm750-pwm-fan.c

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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2014-2018 Nuvoton Technology corporation.
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/sysfs.h>
#include <linux/thermal.h>
/* NPCM7XX PWM registers */
#define NPCM7XX_PWM_REG_BASE(base, n) ((base) + ((n) * 0x1000L))
#define NPCM7XX_PWM_REG_PR(base, n) (NPCM7XX_PWM_REG_BASE(base, n) + 0x00)
#define NPCM7XX_PWM_REG_CSR(base, n) (NPCM7XX_PWM_REG_BASE(base, n) + 0x04)
#define NPCM7XX_PWM_REG_CR(base, n) (NPCM7XX_PWM_REG_BASE(base, n) + 0x08)
#define NPCM7XX_PWM_REG_CNRx(base, n, ch) \
(NPCM7XX_PWM_REG_BASE(base, n) + 0x0C + (12 * (ch)))
#define NPCM7XX_PWM_REG_CMRx(base, n, ch) \
(NPCM7XX_PWM_REG_BASE(base, n) + 0x10 + (12 * (ch)))
#define NPCM7XX_PWM_REG_PDRx(base, n, ch) \
(NPCM7XX_PWM_REG_BASE(base, n) + 0x14 + (12 * (ch)))
#define NPCM7XX_PWM_REG_PIER(base, n) (NPCM7XX_PWM_REG_BASE(base, n) + 0x3C)
#define NPCM7XX_PWM_REG_PIIR(base, n) (NPCM7XX_PWM_REG_BASE(base, n) + 0x40)
#define NPCM7XX_PWM_CTRL_CH0_MODE_BIT BIT(3)
#define NPCM7XX_PWM_CTRL_CH1_MODE_BIT BIT(11)
#define NPCM7XX_PWM_CTRL_CH2_MODE_BIT BIT(15)
#define NPCM7XX_PWM_CTRL_CH3_MODE_BIT BIT(19)
#define NPCM7XX_PWM_CTRL_CH0_INV_BIT BIT(2)
#define NPCM7XX_PWM_CTRL_CH1_INV_BIT BIT(10)
#define NPCM7XX_PWM_CTRL_CH2_INV_BIT BIT(14)
#define NPCM7XX_PWM_CTRL_CH3_INV_BIT BIT(18)
#define NPCM7XX_PWM_CTRL_CH0_EN_BIT BIT(0)
#define NPCM7XX_PWM_CTRL_CH1_EN_BIT BIT(8)
#define NPCM7XX_PWM_CTRL_CH2_EN_BIT BIT(12)
#define NPCM7XX_PWM_CTRL_CH3_EN_BIT BIT(16)
/* Define the maximum PWM channel number */
#define NPCM7XX_PWM_MAX_CHN_NUM 8
#define NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE 4
#define NPCM7XX_PWM_MAX_MODULES 2
/* Define the Counter Register, value = 100 for match 100% */
#define NPCM7XX_PWM_COUNTER_DEFAULT_NUM 255
#define NPCM7XX_PWM_CMR_DEFAULT_NUM 255
#define NPCM7XX_PWM_CMR_MAX 255
/* default all PWM channels PRESCALE2 = 1 */
#define NPCM7XX_PWM_PRESCALE2_DEFAULT_CH0 0x4
#define NPCM7XX_PWM_PRESCALE2_DEFAULT_CH1 0x40
#define NPCM7XX_PWM_PRESCALE2_DEFAULT_CH2 0x400
#define NPCM7XX_PWM_PRESCALE2_DEFAULT_CH3 0x4000
#define PWM_OUTPUT_FREQ_25KHZ 25000
#define PWN_CNT_DEFAULT 256
#define MIN_PRESCALE1 2
#define NPCM7XX_PWM_PRESCALE_SHIFT_CH01 8
#define NPCM7XX_PWM_PRESCALE2_DEFAULT (NPCM7XX_PWM_PRESCALE2_DEFAULT_CH0 | \
NPCM7XX_PWM_PRESCALE2_DEFAULT_CH1 | \
NPCM7XX_PWM_PRESCALE2_DEFAULT_CH2 | \
NPCM7XX_PWM_PRESCALE2_DEFAULT_CH3)
#define NPCM7XX_PWM_CTRL_MODE_DEFAULT (NPCM7XX_PWM_CTRL_CH0_MODE_BIT | \
NPCM7XX_PWM_CTRL_CH1_MODE_BIT | \
NPCM7XX_PWM_CTRL_CH2_MODE_BIT | \
NPCM7XX_PWM_CTRL_CH3_MODE_BIT)
/* NPCM7XX FAN Tacho registers */
#define NPCM7XX_FAN_REG_BASE(base, n) ((base) + ((n) * 0x1000L))
#define NPCM7XX_FAN_REG_TCNT1(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x00)
#define NPCM7XX_FAN_REG_TCRA(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x02)
#define NPCM7XX_FAN_REG_TCRB(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x04)
#define NPCM7XX_FAN_REG_TCNT2(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x06)
#define NPCM7XX_FAN_REG_TPRSC(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x08)
#define NPCM7XX_FAN_REG_TCKC(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x0A)
#define NPCM7XX_FAN_REG_TMCTRL(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x0C)
#define NPCM7XX_FAN_REG_TICTRL(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x0E)
#define NPCM7XX_FAN_REG_TICLR(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x10)
#define NPCM7XX_FAN_REG_TIEN(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x12)
#define NPCM7XX_FAN_REG_TCPA(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x14)
#define NPCM7XX_FAN_REG_TCPB(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x16)
#define NPCM7XX_FAN_REG_TCPCFG(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x18)
#define NPCM7XX_FAN_REG_TINASEL(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x1A)
#define NPCM7XX_FAN_REG_TINBSEL(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x1C)
#define NPCM7XX_FAN_TCKC_CLKX_NONE 0
#define NPCM7XX_FAN_TCKC_CLK1_APB BIT(0)
#define NPCM7XX_FAN_TCKC_CLK2_APB BIT(3)
#define NPCM7XX_FAN_TMCTRL_TBEN BIT(6)
#define NPCM7XX_FAN_TMCTRL_TAEN BIT(5)
#define NPCM7XX_FAN_TMCTRL_TBEDG BIT(4)
#define NPCM7XX_FAN_TMCTRL_TAEDG BIT(3)
#define NPCM7XX_FAN_TMCTRL_MODE_5 BIT(2)
#define NPCM7XX_FAN_TICLR_CLEAR_ALL GENMASK(5, 0)
#define NPCM7XX_FAN_TICLR_TFCLR BIT(5)
#define NPCM7XX_FAN_TICLR_TECLR BIT(4)
#define NPCM7XX_FAN_TICLR_TDCLR BIT(3)
#define NPCM7XX_FAN_TICLR_TCCLR BIT(2)
#define NPCM7XX_FAN_TICLR_TBCLR BIT(1)
#define NPCM7XX_FAN_TICLR_TACLR BIT(0)
#define NPCM7XX_FAN_TIEN_ENABLE_ALL GENMASK(5, 0)
#define NPCM7XX_FAN_TIEN_TFIEN BIT(5)
#define NPCM7XX_FAN_TIEN_TEIEN BIT(4)
#define NPCM7XX_FAN_TIEN_TDIEN BIT(3)
#define NPCM7XX_FAN_TIEN_TCIEN BIT(2)
#define NPCM7XX_FAN_TIEN_TBIEN BIT(1)
#define NPCM7XX_FAN_TIEN_TAIEN BIT(0)
#define NPCM7XX_FAN_TICTRL_TFPND BIT(5)
#define NPCM7XX_FAN_TICTRL_TEPND BIT(4)
#define NPCM7XX_FAN_TICTRL_TDPND BIT(3)
#define NPCM7XX_FAN_TICTRL_TCPND BIT(2)
#define NPCM7XX_FAN_TICTRL_TBPND BIT(1)
#define NPCM7XX_FAN_TICTRL_TAPND BIT(0)
#define NPCM7XX_FAN_TCPCFG_HIBEN BIT(7)
#define NPCM7XX_FAN_TCPCFG_EQBEN BIT(6)
#define NPCM7XX_FAN_TCPCFG_LOBEN BIT(5)
#define NPCM7XX_FAN_TCPCFG_CPBSEL BIT(4)
#define NPCM7XX_FAN_TCPCFG_HIAEN BIT(3)
#define NPCM7XX_FAN_TCPCFG_EQAEN BIT(2)
#define NPCM7XX_FAN_TCPCFG_LOAEN BIT(1)
#define NPCM7XX_FAN_TCPCFG_CPASEL BIT(0)
/* FAN General Definition */
/* Define the maximum FAN channel number */
#define NPCM7XX_FAN_MAX_MODULE 8
#define NPCM7XX_FAN_MAX_CHN_NUM_IN_A_MODULE 2
#define NPCM7XX_FAN_MAX_CHN_NUM 16
/*
* Get Fan Tach Timeout (base on clock 214843.75Hz, 1 cnt = 4.654us)
* Timeout 94ms ~= 0x5000
* (The minimum FAN speed could to support ~640RPM/pulse 1,
* 320RPM/pulse 2, ...-- 10.6Hz)
*/
#define NPCM7XX_FAN_TIMEOUT 0x5000
#define NPCM7XX_FAN_TCNT 0xFFFF
#define NPCM7XX_FAN_TCPA (NPCM7XX_FAN_TCNT - NPCM7XX_FAN_TIMEOUT)
#define NPCM7XX_FAN_TCPB (NPCM7XX_FAN_TCNT - NPCM7XX_FAN_TIMEOUT)
#define NPCM7XX_FAN_POLL_TIMER_200MS 200
#define NPCM7XX_FAN_DEFAULT_PULSE_PER_REVOLUTION 2
#define NPCM7XX_FAN_TINASEL_FANIN_DEFAULT 0
#define NPCM7XX_FAN_CLK_PRESCALE 255
#define NPCM7XX_FAN_CMPA 0
#define NPCM7XX_FAN_CMPB 1
/* Obtain the fan number */
#define NPCM7XX_FAN_INPUT(fan, cmp) (((fan) << 1) + (cmp))
/* fan sample status */
#define FAN_DISABLE 0xFF
#define FAN_INIT 0x00
#define FAN_PREPARE_TO_GET_FIRST_CAPTURE 0x01
#define FAN_ENOUGH_SAMPLE 0x02
struct npcm7xx_fan_dev {
u8 fan_st_flg;
u8 fan_pls_per_rev;
u16 fan_cnt;
u32 fan_cnt_tmp;
};
struct npcm7xx_cooling_device {
char name[THERMAL_NAME_LENGTH];
struct npcm7xx_pwm_fan_data *data;
struct thermal_cooling_device *tcdev;
int pwm_port;
u8 *cooling_levels;
u8 max_state;
u8 cur_state;
};
struct npcm7xx_pwm_fan_data {
void __iomem *pwm_base;
void __iomem *fan_base;
unsigned long pwm_clk_freq;
unsigned long fan_clk_freq;
struct clk *pwm_clk;
struct clk *fan_clk;
struct mutex pwm_lock[NPCM7XX_PWM_MAX_MODULES];
spinlock_t fan_lock[NPCM7XX_FAN_MAX_MODULE];
int fan_irq[NPCM7XX_FAN_MAX_MODULE];
bool pwm_present[NPCM7XX_PWM_MAX_CHN_NUM];
bool fan_present[NPCM7XX_FAN_MAX_CHN_NUM];
u32 input_clk_freq;
struct timer_list fan_timer;
struct npcm7xx_fan_dev fan_dev[NPCM7XX_FAN_MAX_CHN_NUM];
struct npcm7xx_cooling_device *cdev[NPCM7XX_PWM_MAX_CHN_NUM];
u8 fan_select;
};
static int npcm7xx_pwm_config_set(struct npcm7xx_pwm_fan_data *data,
int channel, u16 val)
{
u32 pwm_ch = (channel % NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
u32 module = (channel / NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
u32 tmp_buf, ctrl_en_bit, env_bit;
/*
* Config PWM Comparator register for setting duty cycle
*/
mutex_lock(&data->pwm_lock[module]);
/* write new CMR value */
iowrite32(val, NPCM7XX_PWM_REG_CMRx(data->pwm_base, module, pwm_ch));
tmp_buf = ioread32(NPCM7XX_PWM_REG_CR(data->pwm_base, module));
switch (pwm_ch) {
case 0:
ctrl_en_bit = NPCM7XX_PWM_CTRL_CH0_EN_BIT;
env_bit = NPCM7XX_PWM_CTRL_CH0_INV_BIT;
break;
case 1:
ctrl_en_bit = NPCM7XX_PWM_CTRL_CH1_EN_BIT;
env_bit = NPCM7XX_PWM_CTRL_CH1_INV_BIT;
break;
case 2:
ctrl_en_bit = NPCM7XX_PWM_CTRL_CH2_EN_BIT;
env_bit = NPCM7XX_PWM_CTRL_CH2_INV_BIT;
break;
case 3:
ctrl_en_bit = NPCM7XX_PWM_CTRL_CH3_EN_BIT;
env_bit = NPCM7XX_PWM_CTRL_CH3_INV_BIT;
break;
default:
mutex_unlock(&data->pwm_lock[module]);
return -ENODEV;
}
if (val == 0) {
/* Disable PWM */
tmp_buf &= ~ctrl_en_bit;
tmp_buf |= env_bit;
} else {
/* Enable PWM */
tmp_buf |= ctrl_en_bit;
tmp_buf &= ~env_bit;
}
iowrite32(tmp_buf, NPCM7XX_PWM_REG_CR(data->pwm_base, module));
mutex_unlock(&data->pwm_lock[module]);
return 0;
}
static inline void npcm7xx_fan_start_capture(struct npcm7xx_pwm_fan_data *data,
u8 fan, u8 cmp)
{
u8 fan_id;
u8 reg_mode;
u8 reg_int;
unsigned long flags;
fan_id = NPCM7XX_FAN_INPUT(fan, cmp);
/* to check whether any fan tach is enable */
if (data->fan_dev[fan_id].fan_st_flg != FAN_DISABLE) {
/* reset status */
spin_lock_irqsave(&data->fan_lock[fan], flags);
data->fan_dev[fan_id].fan_st_flg = FAN_INIT;
reg_int = ioread8(NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
/*
* the interrupt enable bits do not need to be cleared before
* it sets, the interrupt enable bits are cleared only on reset.
* the clock unit control register is behaving in the same
* manner that the interrupt enable register behave.
*/
if (cmp == NPCM7XX_FAN_CMPA) {
/* enable interrupt */
iowrite8(reg_int | (NPCM7XX_FAN_TIEN_TAIEN |
NPCM7XX_FAN_TIEN_TEIEN),
NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
reg_mode = NPCM7XX_FAN_TCKC_CLK1_APB
| ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base,
fan));
/* start to Capture */
iowrite8(reg_mode, NPCM7XX_FAN_REG_TCKC(data->fan_base,
fan));
} else {
/* enable interrupt */
iowrite8(reg_int | (NPCM7XX_FAN_TIEN_TBIEN |
NPCM7XX_FAN_TIEN_TFIEN),
NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
reg_mode =
NPCM7XX_FAN_TCKC_CLK2_APB
| ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base,
fan));
/* start to Capture */
iowrite8(reg_mode,
NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
}
spin_unlock_irqrestore(&data->fan_lock[fan], flags);
}
}
/*
* Enable a background timer to poll fan tach value, (200ms * 4)
* to polling all fan
*/
static void npcm7xx_fan_polling(struct timer_list *t)
{
struct npcm7xx_pwm_fan_data *data;
int i;
data = from_timer(data, t, fan_timer);
/*
* Polling two module per one round,
* FAN01 & FAN89 / FAN23 & FAN1011 / FAN45 & FAN1213 / FAN67 & FAN1415
*/
for (i = data->fan_select; i < NPCM7XX_FAN_MAX_MODULE;
i = i + 4) {
/* clear the flag and reset the counter (TCNT) */
iowrite8(NPCM7XX_FAN_TICLR_CLEAR_ALL,
NPCM7XX_FAN_REG_TICLR(data->fan_base, i));
if (data->fan_present[i * 2]) {
iowrite16(NPCM7XX_FAN_TCNT,
NPCM7XX_FAN_REG_TCNT1(data->fan_base, i));
npcm7xx_fan_start_capture(data, i, NPCM7XX_FAN_CMPA);
}
if (data->fan_present[(i * 2) + 1]) {
iowrite16(NPCM7XX_FAN_TCNT,
NPCM7XX_FAN_REG_TCNT2(data->fan_base, i));
npcm7xx_fan_start_capture(data, i, NPCM7XX_FAN_CMPB);
}
}
data->fan_select++;
data->fan_select &= 0x3;
/* reset the timer interval */
data->fan_timer.expires = jiffies +
msecs_to_jiffies(NPCM7XX_FAN_POLL_TIMER_200MS);
add_timer(&data->fan_timer);
}
static inline void npcm7xx_fan_compute(struct npcm7xx_pwm_fan_data *data,
u8 fan, u8 cmp, u8 fan_id, u8 flag_int,
u8 flag_mode, u8 flag_clear)
{
u8 reg_int;
u8 reg_mode;
u16 fan_cap;
if (cmp == NPCM7XX_FAN_CMPA)
fan_cap = ioread16(NPCM7XX_FAN_REG_TCRA(data->fan_base, fan));
else
fan_cap = ioread16(NPCM7XX_FAN_REG_TCRB(data->fan_base, fan));
/* clear capature flag, H/W will auto reset the NPCM7XX_FAN_TCNTx */
iowrite8(flag_clear, NPCM7XX_FAN_REG_TICLR(data->fan_base, fan));
if (data->fan_dev[fan_id].fan_st_flg == FAN_INIT) {
/* First capture, drop it */
data->fan_dev[fan_id].fan_st_flg =
FAN_PREPARE_TO_GET_FIRST_CAPTURE;
/* reset counter */
data->fan_dev[fan_id].fan_cnt_tmp = 0;
} else if (data->fan_dev[fan_id].fan_st_flg < FAN_ENOUGH_SAMPLE) {
/*
* collect the enough sample,
* (ex: 2 pulse fan need to get 2 sample)
*/
data->fan_dev[fan_id].fan_cnt_tmp +=
(NPCM7XX_FAN_TCNT - fan_cap);
data->fan_dev[fan_id].fan_st_flg++;
} else {
/* get enough sample or fan disable */
if (data->fan_dev[fan_id].fan_st_flg == FAN_ENOUGH_SAMPLE) {
data->fan_dev[fan_id].fan_cnt_tmp +=
(NPCM7XX_FAN_TCNT - fan_cap);
/* compute finial average cnt per pulse */
data->fan_dev[fan_id].fan_cnt =
data->fan_dev[fan_id].fan_cnt_tmp /
FAN_ENOUGH_SAMPLE;
data->fan_dev[fan_id].fan_st_flg = FAN_INIT;
}
reg_int = ioread8(NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
/* disable interrupt */
iowrite8((reg_int & ~flag_int),
NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
reg_mode = ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
/* stop capturing */
iowrite8((reg_mode & ~flag_mode),
NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
}
}
static inline void npcm7xx_check_cmp(struct npcm7xx_pwm_fan_data *data,
u8 fan, u8 cmp, u8 flag)
{
u8 reg_int;
u8 reg_mode;
u8 flag_timeout;
u8 flag_cap;
u8 flag_clear;
u8 flag_int;
u8 flag_mode;
u8 fan_id;
fan_id = NPCM7XX_FAN_INPUT(fan, cmp);
if (cmp == NPCM7XX_FAN_CMPA) {
flag_cap = NPCM7XX_FAN_TICTRL_TAPND;
flag_timeout = NPCM7XX_FAN_TICTRL_TEPND;
flag_int = NPCM7XX_FAN_TIEN_TAIEN | NPCM7XX_FAN_TIEN_TEIEN;
flag_mode = NPCM7XX_FAN_TCKC_CLK1_APB;
flag_clear = NPCM7XX_FAN_TICLR_TACLR | NPCM7XX_FAN_TICLR_TECLR;
} else {
flag_cap = NPCM7XX_FAN_TICTRL_TBPND;
flag_timeout = NPCM7XX_FAN_TICTRL_TFPND;
flag_int = NPCM7XX_FAN_TIEN_TBIEN | NPCM7XX_FAN_TIEN_TFIEN;
flag_mode = NPCM7XX_FAN_TCKC_CLK2_APB;
flag_clear = NPCM7XX_FAN_TICLR_TBCLR | NPCM7XX_FAN_TICLR_TFCLR;
}
if (flag & flag_timeout) {
reg_int = ioread8(NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
/* disable interrupt */
iowrite8((reg_int & ~flag_int),
NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
/* clear interrupt flag */
iowrite8(flag_clear,
NPCM7XX_FAN_REG_TICLR(data->fan_base, fan));
reg_mode = ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
/* stop capturing */
iowrite8((reg_mode & ~flag_mode),
NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
/*
* If timeout occurs (NPCM7XX_FAN_TIMEOUT), the fan doesn't
* connect or speed is lower than 10.6Hz (320RPM/pulse2).
* In these situation, the RPM output should be zero.
*/
data->fan_dev[fan_id].fan_cnt = 0;
} else {
/* input capture is occurred */
if (flag & flag_cap)
npcm7xx_fan_compute(data, fan, cmp, fan_id, flag_int,
flag_mode, flag_clear);
}
}
static irqreturn_t npcm7xx_fan_isr(int irq, void *dev_id)
{
struct npcm7xx_pwm_fan_data *data = dev_id;
unsigned long flags;
int module;
u8 flag;
module = irq - data->fan_irq[0];
spin_lock_irqsave(&data->fan_lock[module], flags);
flag = ioread8(NPCM7XX_FAN_REG_TICTRL(data->fan_base, module));
if (flag > 0) {
npcm7xx_check_cmp(data, module, NPCM7XX_FAN_CMPA, flag);
npcm7xx_check_cmp(data, module, NPCM7XX_FAN_CMPB, flag);
spin_unlock_irqrestore(&data->fan_lock[module], flags);
return IRQ_HANDLED;
}
spin_unlock_irqrestore(&data->fan_lock[module], flags);
return IRQ_NONE;
}
static int npcm7xx_read_pwm(struct device *dev, u32 attr, int channel,
long *val)
{
struct npcm7xx_pwm_fan_data *data = dev_get_drvdata(dev);
u32 pmw_ch = (channel % NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
u32 module = (channel / NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
switch (attr) {
case hwmon_pwm_input:
*val = ioread32
(NPCM7XX_PWM_REG_CMRx(data->pwm_base, module, pmw_ch));
return 0;
default:
return -EOPNOTSUPP;
}
}
static int npcm7xx_write_pwm(struct device *dev, u32 attr, int channel,
long val)
{
struct npcm7xx_pwm_fan_data *data = dev_get_drvdata(dev);
int err;
switch (attr) {
case hwmon_pwm_input:
if (val < 0 || val > NPCM7XX_PWM_CMR_MAX)
return -EINVAL;
err = npcm7xx_pwm_config_set(data, channel, (u16)val);
break;
default:
err = -EOPNOTSUPP;
break;
}
return err;
}
static umode_t npcm7xx_pwm_is_visible(const void *_data, u32 attr, int channel)
{
const struct npcm7xx_pwm_fan_data *data = _data;
if (!data->pwm_present[channel])
return 0;
switch (attr) {
case hwmon_pwm_input:
return 0644;
default:
return 0;
}
}
static int npcm7xx_read_fan(struct device *dev, u32 attr, int channel,
long *val)
{
struct npcm7xx_pwm_fan_data *data = dev_get_drvdata(dev);
switch (attr) {
case hwmon_fan_input:
*val = 0;
if (data->fan_dev[channel].fan_cnt <= 0)
return data->fan_dev[channel].fan_cnt;
/* Convert the raw reading to RPM */
if (data->fan_dev[channel].fan_cnt > 0 &&
data->fan_dev[channel].fan_pls_per_rev > 0)
*val = ((data->input_clk_freq * 60) /
(data->fan_dev[channel].fan_cnt *
data->fan_dev[channel].fan_pls_per_rev));
return 0;
default:
return -EOPNOTSUPP;
}
}
static umode_t npcm7xx_fan_is_visible(const void *_data, u32 attr, int channel)
{
const struct npcm7xx_pwm_fan_data *data = _data;
if (!data->fan_present[channel])
return 0;
switch (attr) {
case hwmon_fan_input:
return 0444;
default:
return 0;
}
}
static int npcm7xx_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
switch (type) {
case hwmon_pwm:
return npcm7xx_read_pwm(dev, attr, channel, val);
case hwmon_fan:
return npcm7xx_read_fan(dev, attr, channel, val);
default:
return -EOPNOTSUPP;
}
}
static int npcm7xx_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
switch (type) {
case hwmon_pwm:
return npcm7xx_write_pwm(dev, attr, channel, val);
default:
return -EOPNOTSUPP;
}
}
static umode_t npcm7xx_is_visible(const void *data,
enum hwmon_sensor_types type,
u32 attr, int channel)
{
switch (type) {
case hwmon_pwm:
return npcm7xx_pwm_is_visible(data, attr, channel);
case hwmon_fan:
return npcm7xx_fan_is_visible(data, attr, channel);
default:
return 0;
}
}
static const struct hwmon_channel_info *npcm7xx_info[] = {
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT),
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT,
HWMON_F_INPUT),
NULL
};
static const struct hwmon_ops npcm7xx_hwmon_ops = {
.is_visible = npcm7xx_is_visible,
.read = npcm7xx_read,
.write = npcm7xx_write,
};
static const struct hwmon_chip_info npcm7xx_chip_info = {
.ops = &npcm7xx_hwmon_ops,
.info = npcm7xx_info,
};
static u32 npcm7xx_pwm_init(struct npcm7xx_pwm_fan_data *data)
{
int m, ch;
u32 prescale_val, output_freq;
data->pwm_clk_freq = clk_get_rate(data->pwm_clk);
/* Adjust NPCM7xx PWMs output frequency to ~25Khz */
output_freq = data->pwm_clk_freq / PWN_CNT_DEFAULT;
prescale_val = DIV_ROUND_CLOSEST(output_freq, PWM_OUTPUT_FREQ_25KHZ);
/* If prescale_val = 0, then the prescale output clock is stopped */
if (prescale_val < MIN_PRESCALE1)
prescale_val = MIN_PRESCALE1;
/*
* prescale_val need to decrement in one because in the PWM Prescale
* register the Prescale value increment by one
*/
prescale_val--;
/* Setting PWM Prescale Register value register to both modules */
prescale_val |= (prescale_val << NPCM7XX_PWM_PRESCALE_SHIFT_CH01);
for (m = 0; m < NPCM7XX_PWM_MAX_MODULES ; m++) {
iowrite32(prescale_val, NPCM7XX_PWM_REG_PR(data->pwm_base, m));
iowrite32(NPCM7XX_PWM_PRESCALE2_DEFAULT,
NPCM7XX_PWM_REG_CSR(data->pwm_base, m));
iowrite32(NPCM7XX_PWM_CTRL_MODE_DEFAULT,
NPCM7XX_PWM_REG_CR(data->pwm_base, m));
for (ch = 0; ch < NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE; ch++) {
iowrite32(NPCM7XX_PWM_COUNTER_DEFAULT_NUM,
NPCM7XX_PWM_REG_CNRx(data->pwm_base, m, ch));
}
}
return output_freq / ((prescale_val & 0xf) + 1);
}
static void npcm7xx_fan_init(struct npcm7xx_pwm_fan_data *data)
{
int md;
int ch;
int i;
u32 apb_clk_freq;
for (md = 0; md < NPCM7XX_FAN_MAX_MODULE; md++) {
/* stop FAN0~7 clock */
iowrite8(NPCM7XX_FAN_TCKC_CLKX_NONE,
NPCM7XX_FAN_REG_TCKC(data->fan_base, md));
/* disable all interrupt */
iowrite8(0x00, NPCM7XX_FAN_REG_TIEN(data->fan_base, md));
/* clear all interrupt */
iowrite8(NPCM7XX_FAN_TICLR_CLEAR_ALL,
NPCM7XX_FAN_REG_TICLR(data->fan_base, md));
/* set FAN0~7 clock prescaler */
iowrite8(NPCM7XX_FAN_CLK_PRESCALE,
NPCM7XX_FAN_REG_TPRSC(data->fan_base, md));
/* set FAN0~7 mode (high-to-low transition) */
iowrite8((NPCM7XX_FAN_TMCTRL_MODE_5 | NPCM7XX_FAN_TMCTRL_TBEN |
NPCM7XX_FAN_TMCTRL_TAEN),
NPCM7XX_FAN_REG_TMCTRL(data->fan_base, md));
/* set FAN0~7 Initial Count/Cap */
iowrite16(NPCM7XX_FAN_TCNT,
NPCM7XX_FAN_REG_TCNT1(data->fan_base, md));
iowrite16(NPCM7XX_FAN_TCNT,
NPCM7XX_FAN_REG_TCNT2(data->fan_base, md));
/* set FAN0~7 compare (equal to count) */
iowrite8((NPCM7XX_FAN_TCPCFG_EQAEN | NPCM7XX_FAN_TCPCFG_EQBEN),
NPCM7XX_FAN_REG_TCPCFG(data->fan_base, md));
/* set FAN0~7 compare value */
iowrite16(NPCM7XX_FAN_TCPA,
NPCM7XX_FAN_REG_TCPA(data->fan_base, md));
iowrite16(NPCM7XX_FAN_TCPB,
NPCM7XX_FAN_REG_TCPB(data->fan_base, md));
/* set FAN0~7 fan input FANIN 0~15 */
iowrite8(NPCM7XX_FAN_TINASEL_FANIN_DEFAULT,
NPCM7XX_FAN_REG_TINASEL(data->fan_base, md));
iowrite8(NPCM7XX_FAN_TINASEL_FANIN_DEFAULT,
NPCM7XX_FAN_REG_TINBSEL(data->fan_base, md));
for (i = 0; i < NPCM7XX_FAN_MAX_CHN_NUM_IN_A_MODULE; i++) {
ch = md * NPCM7XX_FAN_MAX_CHN_NUM_IN_A_MODULE + i;
data->fan_dev[ch].fan_st_flg = FAN_DISABLE;
data->fan_dev[ch].fan_pls_per_rev =
NPCM7XX_FAN_DEFAULT_PULSE_PER_REVOLUTION;
data->fan_dev[ch].fan_cnt = 0;
}
}
apb_clk_freq = clk_get_rate(data->fan_clk);
/* Fan tach input clock = APB clock / prescalar, default is 255. */
data->input_clk_freq = apb_clk_freq / (NPCM7XX_FAN_CLK_PRESCALE + 1);
}
static int
npcm7xx_pwm_cz_get_max_state(struct thermal_cooling_device *tcdev,
unsigned long *state)
{
struct npcm7xx_cooling_device *cdev = tcdev->devdata;
*state = cdev->max_state;
return 0;
}
static int
npcm7xx_pwm_cz_get_cur_state(struct thermal_cooling_device *tcdev,
unsigned long *state)
{
struct npcm7xx_cooling_device *cdev = tcdev->devdata;
*state = cdev->cur_state;
return 0;
}
static int
npcm7xx_pwm_cz_set_cur_state(struct thermal_cooling_device *tcdev,
unsigned long state)
{
struct npcm7xx_cooling_device *cdev = tcdev->devdata;
int ret;
if (state > cdev->max_state)
return -EINVAL;
cdev->cur_state = state;
ret = npcm7xx_pwm_config_set(cdev->data, cdev->pwm_port,
cdev->cooling_levels[cdev->cur_state]);
return ret;
}
static const struct thermal_cooling_device_ops npcm7xx_pwm_cool_ops = {
.get_max_state = npcm7xx_pwm_cz_get_max_state,
.get_cur_state = npcm7xx_pwm_cz_get_cur_state,
.set_cur_state = npcm7xx_pwm_cz_set_cur_state,
};
static int npcm7xx_create_pwm_cooling(struct device *dev,
struct device_node *child,
struct npcm7xx_pwm_fan_data *data,
u32 pwm_port, u8 num_levels)
{
int ret;
struct npcm7xx_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, THERMAL_NAME_LENGTH, "%pOFn%d", child,
pwm_port);
cdev->tcdev = devm_thermal_of_cooling_device_register(dev, child,
cdev->name, cdev, &npcm7xx_pwm_cool_ops);
if (IS_ERR(cdev->tcdev))
return PTR_ERR(cdev->tcdev);
cdev->data = data;
cdev->pwm_port = pwm_port;
data->cdev[pwm_port] = cdev;
return 0;
}
static int npcm7xx_en_pwm_fan(struct device *dev,
struct device_node *child,
struct npcm7xx_pwm_fan_data *data)
{
u8 *fan_ch;
u32 pwm_port;
int ret, fan_cnt;
u8 index, ch;
ret = of_property_read_u32(child, "reg", &pwm_port);
if (ret)
return ret;
data->pwm_present[pwm_port] = true;
ret = npcm7xx_pwm_config_set(data, pwm_port,
NPCM7XX_PWM_CMR_DEFAULT_NUM);
ret = of_property_count_u8_elems(child, "cooling-levels");
if (ret > 0) {
ret = npcm7xx_create_pwm_cooling(dev, child, data, pwm_port,
ret);
if (ret)
return ret;
}
fan_cnt = of_property_count_u8_elems(child, "fan-tach-ch");
if (fan_cnt < 1)
return -EINVAL;
fan_ch = devm_kcalloc(dev, fan_cnt, sizeof(*fan_ch), GFP_KERNEL);
if (!fan_ch)
return -ENOMEM;
ret = of_property_read_u8_array(child, "fan-tach-ch", fan_ch, fan_cnt);
if (ret)
return ret;
for (ch = 0; ch < fan_cnt; ch++) {
index = fan_ch[ch];
data->fan_present[index] = true;
data->fan_dev[index].fan_st_flg = FAN_INIT;
}
return 0;
}
static int npcm7xx_pwm_fan_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np, *child;
struct npcm7xx_pwm_fan_data *data;
struct resource *res;
struct device *hwmon;
char name[20];
int ret, cnt;
u32 output_freq;
u32 i;
np = dev->of_node;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pwm");
if (!res) {
dev_err(dev, "pwm resource not found\n");
return -ENODEV;
}
data->pwm_base = devm_ioremap_resource(dev, res);
dev_dbg(dev, "pwm base resource is %pR\n", res);
if (IS_ERR(data->pwm_base))
return PTR_ERR(data->pwm_base);
data->pwm_clk = devm_clk_get(dev, "pwm");
if (IS_ERR(data->pwm_clk)) {
dev_err(dev, "couldn't get pwm clock\n");
return PTR_ERR(data->pwm_clk);
}
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fan");
if (!res) {
dev_err(dev, "fan resource not found\n");
return -ENODEV;
}
data->fan_base = devm_ioremap_resource(dev, res);
dev_dbg(dev, "fan base resource is %pR\n", res);
if (IS_ERR(data->fan_base))
return PTR_ERR(data->fan_base);
data->fan_clk = devm_clk_get(dev, "fan");
if (IS_ERR(data->fan_clk)) {
dev_err(dev, "couldn't get fan clock\n");
return PTR_ERR(data->fan_clk);
}
output_freq = npcm7xx_pwm_init(data);
npcm7xx_fan_init(data);
for (cnt = 0; cnt < NPCM7XX_PWM_MAX_MODULES ; cnt++)
mutex_init(&data->pwm_lock[cnt]);
for (i = 0; i < NPCM7XX_FAN_MAX_MODULE; i++) {
spin_lock_init(&data->fan_lock[i]);
data->fan_irq[i] = platform_get_irq(pdev, i);
if (data->fan_irq[i] < 0)
return data->fan_irq[i];
sprintf(name, "NPCM7XX-FAN-MD%d", i);
ret = devm_request_irq(dev, data->fan_irq[i], npcm7xx_fan_isr,
0, name, (void *)data);
if (ret) {
dev_err(dev, "register IRQ fan%d failed\n", i);
return ret;
}
}
for_each_child_of_node(np, child) {
ret = npcm7xx_en_pwm_fan(dev, child, data);
if (ret) {
dev_err(dev, "enable pwm and fan failed\n");
of_node_put(child);
return ret;
}
}
hwmon = devm_hwmon_device_register_with_info(dev, "npcm7xx_pwm_fan",
data, &npcm7xx_chip_info,
NULL);
if (IS_ERR(hwmon)) {
dev_err(dev, "unable to register hwmon device\n");
return PTR_ERR(hwmon);
}
for (i = 0; i < NPCM7XX_FAN_MAX_CHN_NUM; i++) {
if (data->fan_present[i]) {
/* fan timer initialization */
data->fan_timer.expires = jiffies +
msecs_to_jiffies(NPCM7XX_FAN_POLL_TIMER_200MS);
timer_setup(&data->fan_timer,
npcm7xx_fan_polling, 0);
add_timer(&data->fan_timer);
break;
}
}
pr_info("NPCM7XX PWM-FAN Driver probed, output Freq %dHz[PWM], input Freq %dHz[FAN]\n",
output_freq, data->input_clk_freq);
return 0;
}
static const struct of_device_id of_pwm_fan_match_table[] = {
{ .compatible = "nuvoton,npcm750-pwm-fan", },
{},
};
MODULE_DEVICE_TABLE(of, of_pwm_fan_match_table);
static struct platform_driver npcm7xx_pwm_fan_driver = {
.probe = npcm7xx_pwm_fan_probe,
.driver = {
.name = "npcm7xx_pwm_fan",
.of_match_table = of_pwm_fan_match_table,
},
};
module_platform_driver(npcm7xx_pwm_fan_driver);
MODULE_DESCRIPTION("Nuvoton NPCM7XX PWM and Fan Tacho driver");
MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
MODULE_LICENSE("GPL v2");
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