--- /dev/null
+// 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 127
+#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 u32 npcm7xx_pwm_config[] = {
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT,
+ 0
+};
+
+static const struct hwmon_channel_info npcm7xx_pwm = {
+ .type = hwmon_pwm,
+ .config = npcm7xx_pwm_config,
+};
+
+static const u32 npcm7xx_fan_config[] = {
+ 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,
+ 0
+};
+
+static const struct hwmon_channel_info npcm7xx_fan = {
+ .type = hwmon_fan,
+ .config = npcm7xx_fan_config,
+};
+
+static const struct hwmon_channel_info *npcm7xx_info[] = {
+ &npcm7xx_pwm,
+ &npcm7xx_fan,
+ 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, "%s%d", child->name,
+ pwm_port);
+
+ cdev->tcdev = thermal_of_cooling_device_register(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_kzalloc(dev, sizeof(*fan_ch) * fan_cnt, 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) {
+ dev_err(dev, "get IRQ fan%d failed\n", i);
+ 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");
OSDN Git Service
