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linux-stable/drivers/hwmon/npcm750-pwm-fan.c
Guenter Roeck 2539b15d50 hwmon: (npcm750-pwm-fan) Fix crash observed when instantiating nuvoton,npcm750-pwm-fan 
Commit 89fec128d5 ("hwmon: (npcm750-pwm-fan) Add NPCM8xx support")
introduced support for PWM fans on Nuvoton's npcm845 SoC. This chip
supports three PWM modules with four PWM channels each. The older npcm750
only supported two PWM modules. The commit did not take into account that
the older SoC only supported two PWM modules. This results in a crash if
npcm750 is instantiated when the code attempts to instantiate the
non-existing third PWM module.

Unable to handle kernel paging request at virtual address e0aa2000 when write
[e0aa2000] *pgd=04ab6811, *pte=00000000, *ppte=00000000
Internal error: Oops: 807 [#1] SMP ARM
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Tainted: G                 N 6.7.0-next-20240112-dirty #3
Hardware name: NPCM7XX Chip family
PC is at npcm7xx_pwm_fan_probe+0x204/0x890
LR is at arm_heavy_mb+0x1c/0x38

Fix the problem by detecting the number of supported PWM modules in the
probe function and only instantiating the supported modules.

Fixes: 89fec128d5 ("hwmon: (npcm750-pwm-fan) Add NPCM8xx support")
Cc: Tomer Maimon <tmaimon77@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2024-01-14 07:44:38 -08:00

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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 12
#define NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE 4
#define NPCM7XX_PWM_MAX_MODULES 3
/* 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 npcm_hwmon_info {
u32 pwm_max_channel;
};
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;
int pwm_modules;
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];
const struct npcm_hwmon_info *info;
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] || channel >= data->info->pwm_max_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 * const 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_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 const struct npcm_hwmon_info npxm7xx_hwmon_info = {
.pwm_max_channel = 8,
};
static const struct npcm_hwmon_info npxm8xx_hwmon_info = {
.pwm_max_channel = 12,
};
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 < data->pwm_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);
if (ret)
return ret;
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;
data->info = device_get_match_data(dev);
if (!data->info)
return -EINVAL;
data->pwm_modules = data->info->pwm_max_channel / NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE;
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 < data->pwm_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", .data = &npxm7xx_hwmon_info},
{ .compatible = "nuvoton,npcm845-pwm-fan", .data = &npxm8xx_hwmon_info},
{},
};
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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