[PATCH v2 0/5] hw/arm: Add NPCM7XX Tachometer Device

[PATCH v2 0/5] hw/arm: Add NPCM7XX Tachometer Device

[Hao Wu]

This patch set implements the Tachometer (a.k.a Multi Functional Timer/MFT)
device in NPCM7XX SoC. This device is used by NPCM7XX boards to measure
the RPM of PWM fans.

To provide the RPM of a certain fan, since RPM = MAX_RPM * duty_percentage.
We convert the duty output in NPCM7XX PWM module into GPIOs and feed them
into the MFT module.

The connection of PWM modules and fan modules are derived from their specific
Linux device trees and coded in hw/arm/npcm7xx_boards.c.

We amend the QTest for the PWM module to include verifying the reading from
the Tachometer is correct.

Changes since v1:
- Split implementation of device and addition to board file to separate patches
- Adapt to new Clock API and address conflicts
- Use the new clock_ns_to_ticks API to calculate tachometer counts

Hao Wu (5):
  hw/misc: Add GPIOs for duty in NPCM7xx PWM
  hw/misc: Add NPCM7XX MFT Module
  hw/arm: Add MFT device to NPCM7xx Soc
  hw/arm: Connect PWM fans in NPCM7XX boards
  tests/qtest: Test PWM fan RPM using MFT in PWM test

 docs/system/arm/nuvoton.rst    |   2 +-
 hw/arm/npcm7xx.c               |  45 ++-
 hw/arm/npcm7xx_boards.c        |  99 ++++++
 hw/misc/meson.build            |   1 +
 hw/misc/npcm7xx_mft.c          | 540 +++++++++++++++++++++++++++++++++
 hw/misc/npcm7xx_pwm.c          |   4 +
 hw/misc/trace-events           |   8 +
 include/hw/arm/npcm7xx.h       |  13 +-
 include/hw/misc/npcm7xx_mft.h  |  70 +++++
 include/hw/misc/npcm7xx_pwm.h  |   4 +-
 tests/qtest/npcm7xx_pwm-test.c | 205 ++++++++++++-
 11 files changed, 974 insertions(+), 17 deletions(-)
 create mode 100644 hw/misc/npcm7xx_mft.c
 create mode 100644 include/hw/misc/npcm7xx_mft.h

-- 
2.31.0.rc2.261.g7f71774620-goog

[PATCH v2 1/5] hw/misc: Add GPIOs for duty in NPCM7xx PWM

[Hao Wu]

This patch adds GPIOs in NPCM7xx PWM module for its duty values.
The purpose of this is to connect it to the MFT module to provide
an input for measuring a PWM fan's RPM. Each PWM module has
NPCM7XX_PWM_PER_MODULE of GPIOs, each one corresponds to
one PWM instance and can connect to multiple fan instances in MFT.

Reviewed-by: Doug Evans <dje@google.com>
Reviewed-by: Tyrone Ting <kfting@nuvoton.com>
Signed-off-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/misc/npcm7xx_pwm.c         | 4 ++++
 include/hw/misc/npcm7xx_pwm.h | 4 +++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/hw/misc/npcm7xx_pwm.c b/hw/misc/npcm7xx_pwm.c
index ce192bb274..2be5bd25c6 100644
--- a/hw/misc/npcm7xx_pwm.c
+++ b/hw/misc/npcm7xx_pwm.c
@@ -139,6 +139,7 @@ static void npcm7xx_pwm_update_duty(NPCM7xxPWM *p)
         trace_npcm7xx_pwm_update_duty(DEVICE(p->module)->canonical_path,
                                       p->index, p->duty, duty);
         p->duty = duty;
+        qemu_set_irq(p->module->duty_gpio_out[p->index], p->duty);
     }
 }
 
@@ -483,6 +484,7 @@ static void npcm7xx_pwm_init(Object *obj)
     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
     int i;
 
+    QEMU_BUILD_BUG_ON(ARRAY_SIZE(s->pwm) != NPCM7XX_PWM_PER_MODULE);
     for (i = 0; i < NPCM7XX_PWM_PER_MODULE; i++) {
         NPCM7xxPWM *p = &s->pwm[i];
         p->module = s;
@@ -501,6 +503,8 @@ static void npcm7xx_pwm_init(Object *obj)
         object_property_add_uint32_ptr(obj, "duty[*]",
                 &s->pwm[i].duty, OBJ_PROP_FLAG_READ);
     }
+    qdev_init_gpio_out_named(DEVICE(s), s->duty_gpio_out,
+                             "duty-gpio-out", NPCM7XX_PWM_PER_MODULE);
 }
 
 static const VMStateDescription vmstate_npcm7xx_pwm = {
diff --git a/include/hw/misc/npcm7xx_pwm.h b/include/hw/misc/npcm7xx_pwm.h
index 5a689d3f66..7ad632a93a 100644
--- a/include/hw/misc/npcm7xx_pwm.h
+++ b/include/hw/misc/npcm7xx_pwm.h
@@ -77,6 +77,7 @@ typedef struct NPCM7xxPWM {
  * @iomem: Memory region through which registers are accessed.
  * @clock: The PWM clock.
  * @pwm: The PWM channels owned by this module.
+ * @duty_gpio_out: The duty cycle of each PWM channels as a output GPIO.
  * @ppr: The prescaler register.
  * @csr: The clock selector register.
  * @pcr: The control register.
@@ -89,7 +90,8 @@ struct NPCM7xxPWMState {
     MemoryRegion iomem;
 
     Clock       *clock;
-    NPCM7xxPWM pwm[NPCM7XX_PWM_PER_MODULE];
+    NPCM7xxPWM  pwm[NPCM7XX_PWM_PER_MODULE];
+    qemu_irq    duty_gpio_out[NPCM7XX_PWM_PER_MODULE];
 
     uint32_t    ppr;
     uint32_t    csr;
-- 
2.31.0.rc2.261.g7f71774620-goog

[PATCH v2 2/5] hw/misc: Add NPCM7XX MFT Module

[Hao Wu]

This patch implements Multi Function Timer (MFT) module for NPCM7XX.
This module is mainly used to configure PWM fans. It has just enough
functionality to make the PWM fan kernel module work.

The module takes two input, the max_rpm of a fan (modifiable via QMP)
and duty cycle (a GPIO from the PWM module.) The actual measured RPM
is equal to max_rpm * duty_cycle / NPCM7XX_PWM_MAX_DUTY. The RPM is
measured as a counter compared to a prescaled input clock. The kernel
driver reads this counter and report to user space.

Refs:
https://github.com/torvalds/linux/blob/master/drivers/hwmon/npcm750-pwm-fan.c

Reviewed-by: Doug Evans <dje@google.com>
Reviewed-by: Tyrone Ting <kfting@nuvoton.com>
Signed-off-by: Hao Wu <wuhaotsh@google.com>
---
 hw/misc/meson.build           |   1 +
 hw/misc/npcm7xx_mft.c         | 540 ++++++++++++++++++++++++++++++++++
 hw/misc/trace-events          |   8 +
 include/hw/misc/npcm7xx_mft.h |  70 +++++
 4 files changed, 619 insertions(+)
 create mode 100644 hw/misc/npcm7xx_mft.c
 create mode 100644 include/hw/misc/npcm7xx_mft.h

diff --git a/hw/misc/meson.build b/hw/misc/meson.build
index 00356cf12e..29d72aad0e 100644
--- a/hw/misc/meson.build
+++ b/hw/misc/meson.build
@@ -65,6 +65,7 @@ softmmu_ss.add(when: 'CONFIG_MAINSTONE', if_true: files('mst_fpga.c'))
 softmmu_ss.add(when: 'CONFIG_NPCM7XX', if_true: files(
   'npcm7xx_clk.c',
   'npcm7xx_gcr.c',
+  'npcm7xx_mft.c',
   'npcm7xx_pwm.c',
   'npcm7xx_rng.c',
 ))
diff --git a/hw/misc/npcm7xx_mft.c b/hw/misc/npcm7xx_mft.c
new file mode 100644
index 0000000000..a30583a1b0
--- /dev/null
+++ b/hw/misc/npcm7xx_mft.c
@@ -0,0 +1,540 @@
+/*
+ * Nuvoton NPCM7xx MFT Module
+ *
+ * Copyright 2021 Google LLC
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/irq.h"
+#include "hw/qdev-clock.h"
+#include "hw/qdev-properties.h"
+#include "hw/misc/npcm7xx_mft.h"
+#include "hw/misc/npcm7xx_pwm.h"
+#include "hw/registerfields.h"
+#include "migration/vmstate.h"
+#include "qapi/error.h"
+#include "qapi/visitor.h"
+#include "qemu/bitops.h"
+#include "qemu/error-report.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+#include "qemu/timer.h"
+#include "qemu/units.h"
+#include "trace.h"
+
+/*
+ * Some of the registers can only accessed via 16-bit ops and some can only
+ * be accessed via 8-bit ops. However we mark all of them using REG16 to
+ * simplify implementation. npcm7xx_mft_check_mem_op checks the access length
+ * of memory operations.
+ */
+REG16(NPCM7XX_MFT_CNT1, 0x00);
+REG16(NPCM7XX_MFT_CRA, 0x02);
+REG16(NPCM7XX_MFT_CRB, 0x04);
+REG16(NPCM7XX_MFT_CNT2, 0x06);
+REG16(NPCM7XX_MFT_PRSC, 0x08);
+REG16(NPCM7XX_MFT_CKC, 0x0a);
+REG16(NPCM7XX_MFT_MCTRL, 0x0c);
+REG16(NPCM7XX_MFT_ICTRL, 0x0e);
+REG16(NPCM7XX_MFT_ICLR, 0x10);
+REG16(NPCM7XX_MFT_IEN, 0x12);
+REG16(NPCM7XX_MFT_CPA, 0x14);
+REG16(NPCM7XX_MFT_CPB, 0x16);
+REG16(NPCM7XX_MFT_CPCFG, 0x18);
+REG16(NPCM7XX_MFT_INASEL, 0x1a);
+REG16(NPCM7XX_MFT_INBSEL, 0x1c);
+
+/* Register Fields */
+#define NPCM7XX_MFT_CKC_C2CSEL          BIT(3)
+#define NPCM7XX_MFT_CKC_C1CSEL          BIT(0)
+
+#define NPCM7XX_MFT_MCTRL_TBEN          BIT(6)
+#define NPCM7XX_MFT_MCTRL_TAEN          BIT(5)
+#define NPCM7XX_MFT_MCTRL_TBEDG         BIT(4)
+#define NPCM7XX_MFT_MCTRL_TAEDG         BIT(3)
+#define NPCM7XX_MFT_MCTRL_MODE5         BIT(2)
+
+#define NPCM7XX_MFT_ICTRL_TFPND         BIT(5)
+#define NPCM7XX_MFT_ICTRL_TEPND         BIT(4)
+#define NPCM7XX_MFT_ICTRL_TDPND         BIT(3)
+#define NPCM7XX_MFT_ICTRL_TCPND         BIT(2)
+#define NPCM7XX_MFT_ICTRL_TBPND         BIT(1)
+#define NPCM7XX_MFT_ICTRL_TAPND         BIT(0)
+
+#define NPCM7XX_MFT_ICLR_TFCLR          BIT(5)
+#define NPCM7XX_MFT_ICLR_TECLR          BIT(4)
+#define NPCM7XX_MFT_ICLR_TDCLR          BIT(3)
+#define NPCM7XX_MFT_ICLR_TCCLR          BIT(2)
+#define NPCM7XX_MFT_ICLR_TBCLR          BIT(1)
+#define NPCM7XX_MFT_ICLR_TACLR          BIT(0)
+
+#define NPCM7XX_MFT_IEN_TFIEN           BIT(5)
+#define NPCM7XX_MFT_IEN_TEIEN           BIT(4)
+#define NPCM7XX_MFT_IEN_TDIEN           BIT(3)
+#define NPCM7XX_MFT_IEN_TCIEN           BIT(2)
+#define NPCM7XX_MFT_IEN_TBIEN           BIT(1)
+#define NPCM7XX_MFT_IEN_TAIEN           BIT(0)
+
+#define NPCM7XX_MFT_CPCFG_GET_B(rv)     extract8((rv), 4, 4)
+#define NPCM7XX_MFT_CPCFG_GET_A(rv)     extract8((rv), 0, 4)
+#define NPCM7XX_MFT_CPCFG_HIEN          BIT(3)
+#define NPCM7XX_MFT_CPCFG_EQEN          BIT(2)
+#define NPCM7XX_MFT_CPCFG_LOEN          BIT(1)
+#define NPCM7XX_MFT_CPCFG_CPSEL         BIT(0)
+
+#define NPCM7XX_MFT_INASEL_SELA         BIT(0)
+#define NPCM7XX_MFT_INBSEL_SELB         BIT(0)
+
+/* Max CNT values of the module. The CNT value is a countdown from it. */
+#define NPCM7XX_MFT_MAX_CNT             0xFFFF
+
+/* Each fan revolution should generated 2 pulses */
+#define NPCM7XX_MFT_PULSE_PER_REVOLUTION 2
+
+typedef enum NPCM7xxMFTCaptureState {
+    /* capture succeeded with a valid CNT value. */
+    NPCM7XX_CAPTURE_SUCCEED,
+    /* capture stopped prematurely due to reaching CPCFG condition. */
+    NPCM7XX_CAPTURE_COMPARE_HIT,
+    /* capture fails since it reaches underflow condition for CNT. */
+    NPCM7XX_CAPTURE_UNDERFLOW,
+} NPCM7xxMFTCaptureState;
+
+static void npcm7xx_mft_reset(NPCM7xxMFTState *s)
+{
+    int i;
+
+    /* Only registers PRSC ~ INBSEL need to be reset. */
+    for (i = R_NPCM7XX_MFT_PRSC; i <= R_NPCM7XX_MFT_INBSEL; ++i) {
+        s->regs[i] = 0;
+    }
+}
+
+static void npcm7xx_mft_clear_interrupt(NPCM7xxMFTState *s, uint8_t iclr)
+{
+    /*
+     * Clear bits in ICTRL where corresponding bits in iclr is 1.
+     * Both iclr and ictrl are 8-bit regs. (See npcm7xx_mft_check_mem_op)
+     */
+    s->regs[R_NPCM7XX_MFT_ICTRL] &= ~iclr;
+}
+
+/*
+ * If the CPCFG's condition should be triggered during count down from
+ * NPCM7XX_MFT_MAX_CNT to src if compared to tgt, return the count when
+ * the condition is triggered.
+ * Otherwise return -1.
+ * Since tgt is uint16_t it must always <= NPCM7XX_MFT_MAX_CNT.
+ */
+static int npcm7xx_mft_compare(int32_t src, uint16_t tgt, uint8_t cpcfg)
+{
+    if (cpcfg & NPCM7XX_MFT_CPCFG_HIEN) {
+        return NPCM7XX_MFT_MAX_CNT;
+    }
+    if ((cpcfg & NPCM7XX_MFT_CPCFG_EQEN) && (src <= tgt)) {
+        return tgt;
+    }
+    if ((cpcfg & NPCM7XX_MFT_CPCFG_LOEN) && (tgt > 0) && (src < tgt)) {
+        return tgt - 1;
+    }
+
+    return -1;
+}
+
+/* Compute CNT according to corresponding fan's RPM. */
+static NPCM7xxMFTCaptureState npcm7xx_mft_compute_cnt(
+    Clock *clock, uint32_t max_rpm, uint32_t duty, uint16_t tgt,
+    uint8_t cpcfg, uint16_t *cnt)
+{
+    uint32_t rpm = (uint64_t)max_rpm * (uint64_t)duty / NPCM7XX_PWM_MAX_DUTY;
+    int32_t count;
+    int stopped;
+    NPCM7xxMFTCaptureState state;
+
+    if (rpm == 0) {
+        /*
+         * If RPM = 0, capture won't happen. CNT will continue count down.
+         * So it's effective equivalent to have a cnt > NPCM7XX_MFT_MAX_CNT
+         */
+        count = NPCM7XX_MFT_MAX_CNT + 1;
+    } else {
+        /*
+         * RPM = revolution/min. The time for one revlution (in ns) is
+         * MINUTE_TO_NANOSECOND / RPM.
+         */
+        count = clock_ns_to_ticks(clock, (60 * NANOSECONDS_PER_SECOND) /
+            (rpm * NPCM7XX_MFT_PULSE_PER_REVOLUTION));
+    }
+
+    if (count > NPCM7XX_MFT_MAX_CNT) {
+        count = -1;
+    } else {
+        /* The CNT is a countdown value from NPCM7XX_MFT_MAX_CNT. */
+        count = NPCM7XX_MFT_MAX_CNT - count;
+    }
+    stopped = npcm7xx_mft_compare(count, tgt, cpcfg);
+    if (stopped == -1) {
+        if (count == -1) {
+            /* Underflow */
+            state = NPCM7XX_CAPTURE_UNDERFLOW;
+        } else {
+            state = NPCM7XX_CAPTURE_SUCCEED;
+        }
+    } else {
+        count = stopped;
+        state = NPCM7XX_CAPTURE_COMPARE_HIT;
+    }
+
+    if (count != -1) {
+        *cnt = count;
+    }
+    trace_npcm7xx_mft_rpm(clock->canonical_path, clock_get_hz(clock),
+                          state, count, rpm, duty);
+    return state;
+}
+
+/*
+ * Capture Fan RPM and update CNT and CR registers accordingly.
+ * Raise IRQ if certain contidions are met in IEN.
+ */
+static void npcm7xx_mft_capture(NPCM7xxMFTState *s)
+{
+    int irq_level = 0;
+    NPCM7xxMFTCaptureState state;
+    int sel;
+    uint8_t cpcfg;
+
+    /*
+     * If not mode 5, the behavior is undefined. We just do nothing in this
+     * case.
+     */
+    if (!(s->regs[R_NPCM7XX_MFT_MCTRL] & NPCM7XX_MFT_MCTRL_MODE5)) {
+        return;
+    }
+
+    /* Capture input A. */
+    if (s->regs[R_NPCM7XX_MFT_MCTRL] & NPCM7XX_MFT_MCTRL_TAEN &&
+        s->regs[R_NPCM7XX_MFT_CKC] & NPCM7XX_MFT_CKC_C1CSEL) {
+        sel = s->regs[R_NPCM7XX_MFT_INASEL] & NPCM7XX_MFT_INASEL_SELA;
+        cpcfg = NPCM7XX_MFT_CPCFG_GET_A(s->regs[R_NPCM7XX_MFT_CPCFG]);
+        state = npcm7xx_mft_compute_cnt(s->clock_1,
+                                        sel ? s->max_rpm[2] : s->max_rpm[0],
+                                        sel ? s->duty[2] : s->duty[0],
+                                        s->regs[R_NPCM7XX_MFT_CPA],
+                                        cpcfg,
+                                        &s->regs[R_NPCM7XX_MFT_CNT1]);
+        switch (state) {
+        case NPCM7XX_CAPTURE_SUCCEED:
+            /* Interrupt on input capture on TAn transition - TAPND */
+            s->regs[R_NPCM7XX_MFT_CRA] = s->regs[R_NPCM7XX_MFT_CNT1];
+            s->regs[R_NPCM7XX_MFT_ICTRL] |= NPCM7XX_MFT_ICTRL_TAPND;
+            if (s->regs[R_NPCM7XX_MFT_IEN] & NPCM7XX_MFT_IEN_TAIEN) {
+                irq_level = 1;
+            }
+            break;
+
+        case NPCM7XX_CAPTURE_COMPARE_HIT:
+            /* Compare Hit - TEPND */
+            s->regs[R_NPCM7XX_MFT_ICTRL] |= NPCM7XX_MFT_ICTRL_TEPND;
+            if (s->regs[R_NPCM7XX_MFT_IEN] & NPCM7XX_MFT_IEN_TEIEN) {
+                irq_level = 1;
+            }
+            break;
+
+        case NPCM7XX_CAPTURE_UNDERFLOW:
+            /* Underflow - TCPND */
+            s->regs[R_NPCM7XX_MFT_ICTRL] |= NPCM7XX_MFT_ICTRL_TCPND;
+            if (s->regs[R_NPCM7XX_MFT_IEN] & NPCM7XX_MFT_IEN_TCIEN) {
+                irq_level = 1;
+            }
+            break;
+
+        default:
+            g_assert_not_reached();
+        }
+    }
+
+    /* Capture input B. */
+    if (s->regs[R_NPCM7XX_MFT_MCTRL] & NPCM7XX_MFT_MCTRL_TBEN &&
+        s->regs[R_NPCM7XX_MFT_CKC] & NPCM7XX_MFT_CKC_C2CSEL) {
+        sel = s->regs[R_NPCM7XX_MFT_INBSEL] & NPCM7XX_MFT_INBSEL_SELB;
+        cpcfg = NPCM7XX_MFT_CPCFG_GET_B(s->regs[R_NPCM7XX_MFT_CPCFG]);
+        state = npcm7xx_mft_compute_cnt(s->clock_2,
+                                        sel ? s->max_rpm[3] : s->max_rpm[1],
+                                        sel ? s->duty[3] : s->duty[1],
+                                        s->regs[R_NPCM7XX_MFT_CPB],
+                                        cpcfg,
+                                        &s->regs[R_NPCM7XX_MFT_CNT2]);
+        switch (state) {
+        case NPCM7XX_CAPTURE_SUCCEED:
+            /* Interrupt on input capture on TBn transition - TBPND */
+            s->regs[R_NPCM7XX_MFT_CRB] = s->regs[R_NPCM7XX_MFT_CNT2];
+            s->regs[R_NPCM7XX_MFT_ICTRL] |= NPCM7XX_MFT_ICTRL_TBPND;
+            if (s->regs[R_NPCM7XX_MFT_IEN] & NPCM7XX_MFT_IEN_TBIEN) {
+                irq_level = 1;
+            }
+            break;
+
+        case NPCM7XX_CAPTURE_COMPARE_HIT:
+            /* Compare Hit - TFPND */
+            s->regs[R_NPCM7XX_MFT_ICTRL] |= NPCM7XX_MFT_ICTRL_TFPND;
+            if (s->regs[R_NPCM7XX_MFT_IEN] & NPCM7XX_MFT_IEN_TFIEN) {
+                irq_level = 1;
+            }
+            break;
+
+        case NPCM7XX_CAPTURE_UNDERFLOW:
+            /* Underflow - TDPND */
+            s->regs[R_NPCM7XX_MFT_ICTRL] |= NPCM7XX_MFT_ICTRL_TDPND;
+            if (s->regs[R_NPCM7XX_MFT_IEN] & NPCM7XX_MFT_IEN_TDIEN) {
+                irq_level = 1;
+            }
+            break;
+
+        default:
+            g_assert_not_reached();
+        }
+    }
+
+    trace_npcm7xx_mft_capture(DEVICE(s)->canonical_path, irq_level);
+    qemu_set_irq(s->irq, irq_level);
+}
+
+/* Update clock for counters. */
+static void npcm7xx_mft_update_clock(void *opaque, ClockEvent event)
+{
+    NPCM7xxMFTState *s = NPCM7XX_MFT(opaque);
+    uint64_t prescaled_clock_period;
+
+    prescaled_clock_period = clock_get(s->clock_in) *
+        (s->regs[R_NPCM7XX_MFT_PRSC] + 1ULL);
+    trace_npcm7xx_mft_update_clock(s->clock_in->canonical_path,
+                                   s->regs[R_NPCM7XX_MFT_CKC],
+                                   clock_get(s->clock_in),
+                                   prescaled_clock_period);
+    /* Update clock 1 */
+    if (s->regs[R_NPCM7XX_MFT_CKC] & NPCM7XX_MFT_CKC_C1CSEL) {
+        /* Clock is prescaled. */
+        clock_update(s->clock_1, prescaled_clock_period);
+    } else {
+        /* Clock stopped. */
+        clock_update(s->clock_1, 0);
+    }
+    /* Update clock 2 */
+    if (s->regs[R_NPCM7XX_MFT_CKC] & NPCM7XX_MFT_CKC_C2CSEL) {
+        /* Clock is prescaled. */
+        clock_update(s->clock_2, prescaled_clock_period);
+    } else {
+        /* Clock stopped. */
+        clock_update(s->clock_2, 0);
+    }
+
+    npcm7xx_mft_capture(s);
+}
+
+static uint64_t npcm7xx_mft_read(void *opaque, hwaddr offset, unsigned size)
+{
+    NPCM7xxMFTState *s = NPCM7XX_MFT(opaque);
+    uint16_t value = 0;
+
+    switch (offset) {
+    case A_NPCM7XX_MFT_ICLR:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: register @ 0x%04" HWADDR_PRIx " is write-only\n",
+                      __func__, offset);
+        break;
+
+    default:
+        value = s->regs[offset / 2];
+    }
+
+    trace_npcm7xx_mft_read(DEVICE(s)->canonical_path, offset, value);
+    return value;
+}
+
+static void npcm7xx_mft_write(void *opaque, hwaddr offset,
+                              uint64_t v, unsigned size)
+{
+    NPCM7xxMFTState *s = NPCM7XX_MFT(opaque);
+
+    trace_npcm7xx_mft_write(DEVICE(s)->canonical_path, offset, v);
+    switch (offset) {
+    case A_NPCM7XX_MFT_ICLR:
+        npcm7xx_mft_clear_interrupt(s, v);
+        break;
+
+    case A_NPCM7XX_MFT_CKC:
+    case A_NPCM7XX_MFT_PRSC:
+        s->regs[offset / 2] = v;
+        npcm7xx_mft_update_clock(s, ClockUpdate);
+        break;
+
+    default:
+        s->regs[offset / 2] = v;
+        npcm7xx_mft_capture(s);
+        break;
+    }
+}
+
+static bool npcm7xx_mft_check_mem_op(void *opaque, hwaddr offset,
+                                     unsigned size, bool is_write,
+                                     MemTxAttrs attrs)
+{
+    switch (offset) {
+    /* 16-bit registers. Must be accessed with 16-bit read/write.*/
+    case A_NPCM7XX_MFT_CNT1:
+    case A_NPCM7XX_MFT_CRA:
+    case A_NPCM7XX_MFT_CRB:
+    case A_NPCM7XX_MFT_CNT2:
+    case A_NPCM7XX_MFT_CPA:
+    case A_NPCM7XX_MFT_CPB:
+        return size == 2;
+
+    /* 8-bit registers. Must be accessed with 8-bit read/write.*/
+    case A_NPCM7XX_MFT_PRSC:
+    case A_NPCM7XX_MFT_CKC:
+    case A_NPCM7XX_MFT_MCTRL:
+    case A_NPCM7XX_MFT_ICTRL:
+    case A_NPCM7XX_MFT_ICLR:
+    case A_NPCM7XX_MFT_IEN:
+    case A_NPCM7XX_MFT_CPCFG:
+    case A_NPCM7XX_MFT_INASEL:
+    case A_NPCM7XX_MFT_INBSEL:
+        return size == 1;
+
+    default:
+        /* Invalid registers. */
+        return false;
+    }
+}
+
+static void npcm7xx_mft_get_max_rpm(Object *obj, Visitor *v, const char *name,
+                                    void *opaque, Error **errp)
+{
+    visit_type_uint32(v, name, (uint32_t *)opaque, errp);
+}
+
+static void npcm7xx_mft_set_max_rpm(Object *obj, Visitor *v, const char *name,
+                                    void *opaque, Error **errp)
+{
+    NPCM7xxMFTState *s = NPCM7XX_MFT(obj);
+    uint32_t *max_rpm = opaque;
+    uint32_t value;
+
+    if (!visit_type_uint32(v, name, &value, errp)) {
+        return;
+    }
+
+    *max_rpm = value;
+    npcm7xx_mft_capture(s);
+}
+
+static void npcm7xx_mft_duty_handler(void *opaque, int n, int value)
+{
+    NPCM7xxMFTState *s = NPCM7XX_MFT(opaque);
+
+    trace_npcm7xx_mft_set_duty(DEVICE(s)->canonical_path, n, value);
+    s->duty[n] = value;
+    npcm7xx_mft_capture(s);
+}
+
+static const struct MemoryRegionOps npcm7xx_mft_ops = {
+    .read       = npcm7xx_mft_read,
+    .write      = npcm7xx_mft_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    .valid      = {
+        .min_access_size        = 1,
+        .max_access_size        = 2,
+        .unaligned              = false,
+        .accepts                = npcm7xx_mft_check_mem_op,
+    },
+};
+
+static void npcm7xx_mft_enter_reset(Object *obj, ResetType type)
+{
+    NPCM7xxMFTState *s = NPCM7XX_MFT(obj);
+
+    npcm7xx_mft_reset(s);
+}
+
+static void npcm7xx_mft_hold_reset(Object *obj)
+{
+    NPCM7xxMFTState *s = NPCM7XX_MFT(obj);
+
+    qemu_irq_lower(s->irq);
+}
+
+static void npcm7xx_mft_init(Object *obj)
+{
+    NPCM7xxMFTState *s = NPCM7XX_MFT(obj);
+    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
+    DeviceState *dev = DEVICE(obj);
+
+    memory_region_init_io(&s->iomem, obj, &npcm7xx_mft_ops, s,
+                          TYPE_NPCM7XX_MFT, 4 * KiB);
+    sysbus_init_mmio(sbd, &s->iomem);
+    sysbus_init_irq(sbd, &s->irq);
+    s->clock_in = qdev_init_clock_in(dev, "clock-in", npcm7xx_mft_update_clock,
+                                     s, ClockUpdate);
+    s->clock_1 = qdev_init_clock_out(dev, "clock1");
+    s->clock_2 = qdev_init_clock_out(dev, "clock2");
+
+    for (int i = 0; i < NPCM7XX_PWM_PER_MODULE; ++i) {
+        object_property_add(obj, "max_rpm[*]", "uint32",
+                            npcm7xx_mft_get_max_rpm,
+                            npcm7xx_mft_set_max_rpm,
+                            NULL, &s->max_rpm[i]);
+    }
+    qdev_init_gpio_in_named(dev, npcm7xx_mft_duty_handler, "duty",
+                            NPCM7XX_MFT_FANIN_COUNT);
+}
+
+static const VMStateDescription vmstate_npcm7xx_mft = {
+    .name = "npcm7xx-mft-module",
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .fields = (VMStateField[]) {
+        VMSTATE_CLOCK(clock_in, NPCM7xxMFTState),
+        VMSTATE_CLOCK(clock_1, NPCM7xxMFTState),
+        VMSTATE_CLOCK(clock_2, NPCM7xxMFTState),
+        VMSTATE_UINT16_ARRAY(regs, NPCM7xxMFTState, NPCM7XX_MFT_NR_REGS),
+        VMSTATE_UINT32_ARRAY(max_rpm, NPCM7xxMFTState, NPCM7XX_MFT_FANIN_COUNT),
+        VMSTATE_UINT32_ARRAY(duty, NPCM7xxMFTState, NPCM7XX_MFT_FANIN_COUNT),
+        VMSTATE_END_OF_LIST(),
+    },
+};
+
+static void npcm7xx_mft_class_init(ObjectClass *klass, void *data)
+{
+    ResettableClass *rc = RESETTABLE_CLASS(klass);
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->desc = "NPCM7xx MFT Controller";
+    dc->vmsd = &vmstate_npcm7xx_mft;
+    rc->phases.enter = npcm7xx_mft_enter_reset;
+    rc->phases.hold = npcm7xx_mft_hold_reset;
+}
+
+static const TypeInfo npcm7xx_mft_info = {
+    .name               = TYPE_NPCM7XX_MFT,
+    .parent             = TYPE_SYS_BUS_DEVICE,
+    .instance_size      = sizeof(NPCM7xxMFTState),
+    .class_init         = npcm7xx_mft_class_init,
+    .instance_init      = npcm7xx_mft_init,
+};
+
+static void npcm7xx_mft_register_type(void)
+{
+    type_register_static(&npcm7xx_mft_info);
+}
+type_init(npcm7xx_mft_register_type);
diff --git a/hw/misc/trace-events b/hw/misc/trace-events
index 4b15db8ca4..4380d690f3 100644
--- a/hw/misc/trace-events
+++ b/hw/misc/trace-events
@@ -116,6 +116,14 @@ npcm7xx_clk_write(uint64_t offset, uint32_t value) "offset: 0x%04" PRIx64 " valu
 npcm7xx_gcr_read(uint64_t offset, uint32_t value) " offset: 0x%04" PRIx64 " value: 0x%08" PRIx32
 npcm7xx_gcr_write(uint64_t offset, uint32_t value) "offset: 0x%04" PRIx64 " value: 0x%08" PRIx32
 
+# npcm7xx_mft.c
+npcm7xx_mft_read(const char *name, uint64_t offset, uint16_t value) "%s: offset: 0x%04" PRIx64 " value: 0x%04" PRIx16
+npcm7xx_mft_write(const char *name, uint64_t offset, uint16_t value) "%s: offset: 0x%04" PRIx64 " value: 0x%04" PRIx16
+npcm7xx_mft_rpm(const char *clock, uint32_t clock_hz, int state, int32_t cnt, uint32_t rpm, uint32_t duty) " fan clk: %s clock_hz: %" PRIu32 ", state: %d, cnt: %" PRIi32 ", rpm: %" PRIu32 ", duty: %" PRIu32
+npcm7xx_mft_capture(const char *name, int irq_level) "%s: level: %d"
+npcm7xx_mft_update_clock(const char *name, uint16_t sel, uint64_t clock_period, uint64_t prescaled_clock_period) "%s: sel: 0x%02" PRIx16 ", period: %" PRIu64 ", prescaled: %" PRIu64
+npcm7xx_mft_set_duty(const char *name, int n, int value) "%s[%d]: %d"
+
 # npcm7xx_rng.c
 npcm7xx_rng_read(uint64_t offset, uint64_t value, unsigned size) "offset: 0x%04" PRIx64 " value: 0x%02" PRIx64 " size: %u"
 npcm7xx_rng_write(uint64_t offset, uint64_t value, unsigned size) "offset: 0x%04" PRIx64 " value: 0x%02" PRIx64 " size: %u"
diff --git a/include/hw/misc/npcm7xx_mft.h b/include/hw/misc/npcm7xx_mft.h
new file mode 100644
index 0000000000..36785e3ba8
--- /dev/null
+++ b/include/hw/misc/npcm7xx_mft.h
@@ -0,0 +1,70 @@
+/*
+ * Nuvoton NPCM7xx MFT Module
+ *
+ * Copyright 2021 Google LLC
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+#ifndef NPCM7XX_MFT_H
+#define NPCM7XX_MFT_H
+
+#include "exec/memory.h"
+#include "hw/clock.h"
+#include "hw/irq.h"
+#include "hw/sysbus.h"
+#include "qom/object.h"
+
+/* Max Fan input number. */
+#define NPCM7XX_MFT_MAX_FAN_INPUT 19
+
+/*
+ * Number of registers in one MFT module. Don't change this without increasing
+ * the version_id in vmstate.
+ */
+#define NPCM7XX_MFT_NR_REGS (0x20 / sizeof(uint16_t))
+
+/*
+ * The MFT can take up to 4 inputs: A0, B0, A1, B1. It can measure one A and one
+ * B simultaneously. NPCM7XX_MFT_INASEL and NPCM7XX_MFT_INBSEL are used to
+ * select which A or B input are used.
+ */
+#define NPCM7XX_MFT_FANIN_COUNT 4
+
+/**
+ * struct NPCM7xxMFTState - Multi Functional Tachometer device state.
+ * @parent: System bus device.
+ * @iomem: Memory region through which registers are accessed.
+ * @clock_in: The input clock for MFT from CLK module.
+ * @clock_{1,2}: The counter clocks for NPCM7XX_MFT_CNT{1,2}
+ * @irq: The IRQ for this MFT state.
+ * @regs: The MMIO registers.
+ * @max_rpm: The maximum rpm for fans. Order: A0, B0, A1, B1.
+ * @duty: The duty cycles for fans, relative to NPCM7XX_PWM_MAX_DUTY.
+ */
+typedef struct NPCM7xxMFTState {
+    SysBusDevice parent;
+
+    MemoryRegion iomem;
+
+    Clock       *clock_in;
+    Clock       *clock_1, *clock_2;
+    qemu_irq    irq;
+    uint16_t    regs[NPCM7XX_MFT_NR_REGS];
+
+    uint32_t    max_rpm[NPCM7XX_MFT_FANIN_COUNT];
+    uint32_t    duty[NPCM7XX_MFT_FANIN_COUNT];
+} NPCM7xxMFTState;
+
+#define TYPE_NPCM7XX_MFT "npcm7xx-mft"
+#define NPCM7XX_MFT(obj) \
+    OBJECT_CHECK(NPCM7xxMFTState, (obj), TYPE_NPCM7XX_MFT)
+
+#endif /* NPCM7XX_MFT_H */
-- 
2.31.0.rc2.261.g7f71774620-goog

[PATCH v2 3/5] hw/arm: Add MFT device to NPCM7xx Soc

[Hao Wu]

This patch adds the recently implemented MFT device to the NPCM7XX
SoC file.

Reviewed-by: Doug Evans <dje@google.com>
Reviewed-by: Tyrone Ting <kfting@nuvoton.com>
Signed-off-by: Hao Wu <wuhaotsh@google.com>
---
 docs/system/arm/nuvoton.rst |  2 +-
 hw/arm/npcm7xx.c            | 45 ++++++++++++++++++++++++++++++-------
 include/hw/arm/npcm7xx.h    |  2 ++
 3 files changed, 40 insertions(+), 9 deletions(-)

diff --git a/docs/system/arm/nuvoton.rst b/docs/system/arm/nuvoton.rst
index f9fb9224da..d3cf2d9cd7 100644
--- a/docs/system/arm/nuvoton.rst
+++ b/docs/system/arm/nuvoton.rst
@@ -45,6 +45,7 @@ Supported devices
  * Pulse Width Modulation (PWM)
  * SMBus controller (SMBF)
  * Ethernet controller (EMC)
+ * Tachometer
 
 Missing devices
 ---------------
@@ -63,7 +64,6 @@ Missing devices
  * Peripheral SPI controller (PSPI)
  * SD/MMC host
  * PECI interface
- * Tachometer
  * PCI and PCIe root complex and bridges
  * VDM and MCTP support
  * Serial I/O expansion
diff --git a/hw/arm/npcm7xx.c b/hw/arm/npcm7xx.c
index 9bd1e83f02..495b0f8e91 100644
--- a/hw/arm/npcm7xx.c
+++ b/hw/arm/npcm7xx.c
@@ -122,6 +122,14 @@ enum NPCM7xxInterrupt {
     NPCM7XX_SMBUS15_IRQ,
     NPCM7XX_PWM0_IRQ            = 93,   /* PWM module 0 */
     NPCM7XX_PWM1_IRQ,                   /* PWM module 1 */
+    NPCM7XX_MFT0_IRQ            = 96,   /* MFT module 0 */
+    NPCM7XX_MFT1_IRQ,                   /* MFT module 1 */
+    NPCM7XX_MFT2_IRQ,                   /* MFT module 2 */
+    NPCM7XX_MFT3_IRQ,                   /* MFT module 3 */
+    NPCM7XX_MFT4_IRQ,                   /* MFT module 4 */
+    NPCM7XX_MFT5_IRQ,                   /* MFT module 5 */
+    NPCM7XX_MFT6_IRQ,                   /* MFT module 6 */
+    NPCM7XX_MFT7_IRQ,                   /* MFT module 7 */
     NPCM7XX_EMC2RX_IRQ          = 114,
     NPCM7XX_EMC2TX_IRQ,
     NPCM7XX_GPIO0_IRQ           = 116,
@@ -172,6 +180,18 @@ static const hwaddr npcm7xx_pwm_addr[] = {
     0xf0104000,
 };
 
+/* Register base address for each MFT Module */
+static const hwaddr npcm7xx_mft_addr[] = {
+    0xf0180000,
+    0xf0181000,
+    0xf0182000,
+    0xf0183000,
+    0xf0184000,
+    0xf0185000,
+    0xf0186000,
+    0xf0187000,
+};
+
 /* Direct memory-mapped access to each SMBus Module. */
 static const hwaddr npcm7xx_smbus_addr[] = {
     0xf0080000,
@@ -417,6 +437,10 @@ static void npcm7xx_init(Object *obj)
         object_initialize_child(obj, "pwm[*]", &s->pwm[i], TYPE_NPCM7XX_PWM);
     }
 
+    for (i = 0; i < ARRAY_SIZE(s->mft); i++) {
+        object_initialize_child(obj, "mft[*]", &s->mft[i], TYPE_NPCM7XX_MFT);
+    }
+
     for (i = 0; i < ARRAY_SIZE(s->emc); i++) {
         object_initialize_child(obj, "emc[*]", &s->emc[i], TYPE_NPCM7XX_EMC);
     }
@@ -603,6 +627,19 @@ static void npcm7xx_realize(DeviceState *dev, Error **errp)
         sysbus_connect_irq(sbd, i, npcm7xx_irq(s, NPCM7XX_PWM0_IRQ + i));
     }
 
+    /* MFT Modules. Cannot fail. */
+    QEMU_BUILD_BUG_ON(ARRAY_SIZE(npcm7xx_mft_addr) != ARRAY_SIZE(s->mft));
+    for (i = 0; i < ARRAY_SIZE(s->mft); i++) {
+        SysBusDevice *sbd = SYS_BUS_DEVICE(&s->mft[i]);
+
+        qdev_connect_clock_in(DEVICE(&s->mft[i]), "clock-in",
+                              qdev_get_clock_out(DEVICE(&s->clk),
+                                                 "apb4-clock"));
+        sysbus_realize(sbd, &error_abort);
+        sysbus_mmio_map(sbd, 0, npcm7xx_mft_addr[i]);
+        sysbus_connect_irq(sbd, 0, npcm7xx_irq(s, NPCM7XX_MFT0_IRQ + i));
+    }
+
     /*
      * EMC Modules. Cannot fail.
      * The mapping of the device to its netdev backend works as follows:
@@ -680,14 +717,6 @@ static void npcm7xx_realize(DeviceState *dev, Error **errp)
     create_unimplemented_device("npcm7xx.peci",         0xf0100000,   4 * KiB);
     create_unimplemented_device("npcm7xx.siox[1]",      0xf0101000,   4 * KiB);
     create_unimplemented_device("npcm7xx.siox[2]",      0xf0102000,   4 * KiB);
-    create_unimplemented_device("npcm7xx.mft[0]",       0xf0180000,   4 * KiB);
-    create_unimplemented_device("npcm7xx.mft[1]",       0xf0181000,   4 * KiB);
-    create_unimplemented_device("npcm7xx.mft[2]",       0xf0182000,   4 * KiB);
-    create_unimplemented_device("npcm7xx.mft[3]",       0xf0183000,   4 * KiB);
-    create_unimplemented_device("npcm7xx.mft[4]",       0xf0184000,   4 * KiB);
-    create_unimplemented_device("npcm7xx.mft[5]",       0xf0185000,   4 * KiB);
-    create_unimplemented_device("npcm7xx.mft[6]",       0xf0186000,   4 * KiB);
-    create_unimplemented_device("npcm7xx.mft[7]",       0xf0187000,   4 * KiB);
     create_unimplemented_device("npcm7xx.pspi1",        0xf0200000,   4 * KiB);
     create_unimplemented_device("npcm7xx.pspi2",        0xf0201000,   4 * KiB);
     create_unimplemented_device("npcm7xx.ahbpci",       0xf0400000,   1 * MiB);
diff --git a/include/hw/arm/npcm7xx.h b/include/hw/arm/npcm7xx.h
index d32849a456..3f70554d0f 100644
--- a/include/hw/arm/npcm7xx.h
+++ b/include/hw/arm/npcm7xx.h
@@ -24,6 +24,7 @@
 #include "hw/mem/npcm7xx_mc.h"
 #include "hw/misc/npcm7xx_clk.h"
 #include "hw/misc/npcm7xx_gcr.h"
+#include "hw/misc/npcm7xx_mft.h"
 #include "hw/misc/npcm7xx_pwm.h"
 #include "hw/misc/npcm7xx_rng.h"
 #include "hw/net/npcm7xx_emc.h"
@@ -82,6 +83,7 @@ typedef struct NPCM7xxState {
     NPCM7xxTimerCtrlState tim[3];
     NPCM7xxADCState     adc;
     NPCM7xxPWMState     pwm[2];
+    NPCM7xxMFTState     mft[8];
     NPCM7xxOTPState     key_storage;
     NPCM7xxOTPState     fuse_array;
     NPCM7xxMCState      mc;
-- 
2.31.0.rc2.261.g7f71774620-goog

[PATCH v2 4/5] hw/arm: Connect PWM fans in NPCM7XX boards

[Hao Wu]

This patch adds fan_splitters (split IRQs) in NPCM7XX boards. Each fan
splitter corresponds to 1 PWM output and can connect to multiple fan
inputs (MFT devices).
In NPCM7XX boards(NPCM750 EVB and Quanta GSJ boards), we initializes
these splitters and connect them to their corresponding modules
according their specific device trees.

Reviewed-by: Doug Evans <dje@google.com>
Reviewed-by: Tyrone Ting <kfting@nuvoton.com>
Signed-off-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/arm/npcm7xx_boards.c  | 99 ++++++++++++++++++++++++++++++++++++++++
 include/hw/arm/npcm7xx.h | 11 ++++-
 2 files changed, 109 insertions(+), 1 deletion(-)

diff --git a/hw/arm/npcm7xx_boards.c b/hw/arm/npcm7xx_boards.c
index fbf6ce8e02..e22fe4bf8f 100644
--- a/hw/arm/npcm7xx_boards.c
+++ b/hw/arm/npcm7xx_boards.c
@@ -21,6 +21,7 @@
 #include "hw/core/cpu.h"
 #include "hw/i2c/smbus_eeprom.h"
 #include "hw/loader.h"
+#include "hw/qdev-core.h"
 #include "hw/qdev-properties.h"
 #include "qapi/error.h"
 #include "qemu-common.h"
@@ -116,6 +117,64 @@ static void at24c_eeprom_init(NPCM7xxState *soc, int bus, uint8_t addr,
     i2c_slave_realize_and_unref(i2c_dev, i2c_bus, &error_abort);
 }
 
+static void npcm7xx_init_pwm_splitter(NPCM7xxMachine *machine,
+                                      NPCM7xxState *soc, const int *fan_counts)
+{
+    SplitIRQ *splitters = machine->fan_splitter;
+
+    /*
+     * PWM 0~3 belong to module 0 output 0~3.
+     * PWM 4~7 belong to module 1 output 0~3.
+     */
+    for (int i = 0; i < NPCM7XX_NR_PWM_MODULES; ++i) {
+        for (int j = 0; j < NPCM7XX_PWM_PER_MODULE; ++j) {
+            int splitter_no = i * NPCM7XX_PWM_PER_MODULE + j;
+            DeviceState *splitter;
+
+            if (fan_counts[splitter_no] < 1) {
+                continue;
+            }
+            object_initialize_child(OBJECT(machine), "fan-splitter[*]",
+                                    &splitters[splitter_no], TYPE_SPLIT_IRQ);
+            splitter = DEVICE(&splitters[splitter_no]);
+            qdev_prop_set_uint16(splitter, "num-lines",
+                                 fan_counts[splitter_no]);
+            qdev_realize(splitter, NULL, &error_abort);
+            qdev_connect_gpio_out_named(DEVICE(&soc->pwm[i]), "duty-gpio-out",
+                                        j, qdev_get_gpio_in(splitter, 0));
+        }
+    }
+}
+
+static void npcm7xx_connect_pwm_fan(NPCM7xxState *soc, SplitIRQ *splitter,
+                                    int fan_no, int output_no)
+{
+    DeviceState *fan;
+    int fan_input;
+    qemu_irq fan_duty_gpio;
+
+    g_assert(fan_no >= 0 && fan_no <= NPCM7XX_MFT_MAX_FAN_INPUT);
+    /*
+     * Fan 0~1 belong to module 0 input 0~1.
+     * Fan 2~3 belong to module 1 input 0~1.
+     * ...
+     * Fan 14~15 belong to module 7 input 0~1.
+     * Fan 16~17 belong to module 0 input 2~3.
+     * Fan 18~19 belong to module 1 input 2~3.
+     */
+    if (fan_no < 16) {
+        fan = DEVICE(&soc->mft[fan_no / 2]);
+        fan_input = fan_no % 2;
+    } else {
+        fan = DEVICE(&soc->mft[(fan_no - 16) / 2]);
+        fan_input = fan_no % 2 + 2;
+    }
+
+    /* Connect the Fan to PWM module */
+    fan_duty_gpio = qdev_get_gpio_in_named(fan, "duty", fan_input);
+    qdev_connect_gpio_out(DEVICE(splitter), output_no, fan_duty_gpio);
+}
+
 static void npcm750_evb_i2c_init(NPCM7xxState *soc)
 {
     /* lm75 temperature sensor on SVB, tmp105 is compatible */
@@ -128,6 +187,30 @@ static void npcm750_evb_i2c_init(NPCM7xxState *soc)
     i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 6), "tmp105", 0x48);
 }
 
+static void npcm750_evb_fan_init(NPCM7xxMachine *machine, NPCM7xxState *soc)
+{
+    SplitIRQ *splitter = machine->fan_splitter;
+    static const int fan_counts[] = {2, 2, 2, 2, 2, 2, 2, 2};
+
+    npcm7xx_init_pwm_splitter(machine, soc, fan_counts);
+    npcm7xx_connect_pwm_fan(soc, &splitter[0], 0x00, 0);
+    npcm7xx_connect_pwm_fan(soc, &splitter[0], 0x01, 1);
+    npcm7xx_connect_pwm_fan(soc, &splitter[1], 0x02, 0);
+    npcm7xx_connect_pwm_fan(soc, &splitter[1], 0x03, 1);
+    npcm7xx_connect_pwm_fan(soc, &splitter[2], 0x04, 0);
+    npcm7xx_connect_pwm_fan(soc, &splitter[2], 0x05, 1);
+    npcm7xx_connect_pwm_fan(soc, &splitter[3], 0x06, 0);
+    npcm7xx_connect_pwm_fan(soc, &splitter[3], 0x07, 1);
+    npcm7xx_connect_pwm_fan(soc, &splitter[4], 0x08, 0);
+    npcm7xx_connect_pwm_fan(soc, &splitter[4], 0x09, 1);
+    npcm7xx_connect_pwm_fan(soc, &splitter[5], 0x0a, 0);
+    npcm7xx_connect_pwm_fan(soc, &splitter[5], 0x0b, 1);
+    npcm7xx_connect_pwm_fan(soc, &splitter[6], 0x0c, 0);
+    npcm7xx_connect_pwm_fan(soc, &splitter[6], 0x0d, 1);
+    npcm7xx_connect_pwm_fan(soc, &splitter[7], 0x0e, 0);
+    npcm7xx_connect_pwm_fan(soc, &splitter[7], 0x0f, 1);
+}
+
 static void quanta_gsj_i2c_init(NPCM7xxState *soc)
 {
     /* GSJ machine have 4 max31725 temperature sensors, tmp105 is compatible. */
@@ -142,6 +225,20 @@ static void quanta_gsj_i2c_init(NPCM7xxState *soc)
     /* TODO: Add additional i2c devices. */
 }
 
+static void quanta_gsj_fan_init(NPCM7xxMachine *machine, NPCM7xxState *soc)
+{
+    SplitIRQ *splitter = machine->fan_splitter;
+    static const int fan_counts[] = {2, 2, 2, 0, 0, 0, 0, 0};
+
+    npcm7xx_init_pwm_splitter(machine, soc, fan_counts);
+    npcm7xx_connect_pwm_fan(soc, &splitter[0], 0x00, 0);
+    npcm7xx_connect_pwm_fan(soc, &splitter[0], 0x01, 1);
+    npcm7xx_connect_pwm_fan(soc, &splitter[1], 0x02, 0);
+    npcm7xx_connect_pwm_fan(soc, &splitter[1], 0x03, 1);
+    npcm7xx_connect_pwm_fan(soc, &splitter[2], 0x04, 0);
+    npcm7xx_connect_pwm_fan(soc, &splitter[2], 0x05, 1);
+}
+
 static void npcm750_evb_init(MachineState *machine)
 {
     NPCM7xxState *soc;
@@ -153,6 +250,7 @@ static void npcm750_evb_init(MachineState *machine)
     npcm7xx_load_bootrom(machine, soc);
     npcm7xx_connect_flash(&soc->fiu[0], 0, "w25q256", drive_get(IF_MTD, 0, 0));
     npcm750_evb_i2c_init(soc);
+    npcm750_evb_fan_init(NPCM7XX_MACHINE(machine), soc);
     npcm7xx_load_kernel(machine, soc);
 }
 
@@ -168,6 +266,7 @@ static void quanta_gsj_init(MachineState *machine)
     npcm7xx_connect_flash(&soc->fiu[0], 0, "mx25l25635e",
                           drive_get(IF_MTD, 0, 0));
     quanta_gsj_i2c_init(soc);
+    quanta_gsj_fan_init(NPCM7XX_MACHINE(machine), soc);
     npcm7xx_load_kernel(machine, soc);
 }
 
diff --git a/include/hw/arm/npcm7xx.h b/include/hw/arm/npcm7xx.h
index 3f70554d0f..61ecc57ab9 100644
--- a/include/hw/arm/npcm7xx.h
+++ b/include/hw/arm/npcm7xx.h
@@ -18,6 +18,7 @@
 
 #include "hw/boards.h"
 #include "hw/adc/npcm7xx_adc.h"
+#include "hw/core/split-irq.h"
 #include "hw/cpu/a9mpcore.h"
 #include "hw/gpio/npcm7xx_gpio.h"
 #include "hw/i2c/npcm7xx_smbus.h"
@@ -48,8 +49,16 @@
 #define NPCM7XX_GIC_CPU_IF_ADDR         (0xf03fe100)  /* GIC within A9 */
 #define NPCM7XX_BOARD_SETUP_ADDR        (0xffff1000)  /* Boot ROM */
 
+#define NPCM7XX_NR_PWM_MODULES 2
+
 typedef struct NPCM7xxMachine {
     MachineState        parent;
+    /*
+     * PWM fan splitter. each splitter connects to one PWM output and
+     * multiple MFT inputs.
+     */
+    SplitIRQ            fan_splitter[NPCM7XX_NR_PWM_MODULES *
+                                     NPCM7XX_PWM_PER_MODULE];
 } NPCM7xxMachine;
 
 #define TYPE_NPCM7XX_MACHINE MACHINE_TYPE_NAME("npcm7xx")
@@ -82,7 +91,7 @@ typedef struct NPCM7xxState {
     NPCM7xxCLKState     clk;
     NPCM7xxTimerCtrlState tim[3];
     NPCM7xxADCState     adc;
-    NPCM7xxPWMState     pwm[2];
+    NPCM7xxPWMState     pwm[NPCM7XX_NR_PWM_MODULES];
     NPCM7xxMFTState     mft[8];
     NPCM7xxOTPState     key_storage;
     NPCM7xxOTPState     fuse_array;
-- 
2.31.0.rc2.261.g7f71774620-goog

[PATCH v2 5/5] tests/qtest: Test PWM fan RPM using MFT in PWM test

[Hao Wu]

This patch adds testing of PWM fan RPMs in the existing npcm7xx pwm
test. It tests whether the MFT module can measure correct fan values
for a PWM fan in NPCM7XX boards.

Reviewed-by: Doug Evans <dje@google.com>
Reviewed-by: Tyrone Ting <kfting@nuvoton.com>
Signed-off-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
---
 tests/qtest/npcm7xx_pwm-test.c | 205 ++++++++++++++++++++++++++++++++-
 1 file changed, 199 insertions(+), 6 deletions(-)

diff --git a/tests/qtest/npcm7xx_pwm-test.c b/tests/qtest/npcm7xx_pwm-test.c
index 3d82654b81..72317f4c81 100644
--- a/tests/qtest/npcm7xx_pwm-test.c
+++ b/tests/qtest/npcm7xx_pwm-test.c
@@ -45,6 +45,7 @@
 #define PLL_FBDV(rv)    extract32((rv), 16, 12)
 #define PLL_OTDV1(rv)   extract32((rv), 8, 3)
 #define PLL_OTDV2(rv)   extract32((rv), 13, 3)
+#define APB4CKDIV(rv)   extract32((rv), 30, 2)
 #define APB3CKDIV(rv)   extract32((rv), 28, 2)
 #define CLK2CKDIV(rv)   extract32((rv), 0, 1)
 #define CLK4CKDIV(rv)   extract32((rv), 26, 2)
@@ -52,6 +53,49 @@
 
 #define MAX_DUTY        1000000
 
+/* MFT (PWM fan) related */
+#define MFT_BA(n)       (0xf0180000 + ((n) * 0x1000))
+#define MFT_IRQ(n)      (96 + (n))
+#define MFT_CNT1        0x00
+#define MFT_CRA         0x02
+#define MFT_CRB         0x04
+#define MFT_CNT2        0x06
+#define MFT_PRSC        0x08
+#define MFT_CKC         0x0a
+#define MFT_MCTRL       0x0c
+#define MFT_ICTRL       0x0e
+#define MFT_ICLR        0x10
+#define MFT_IEN         0x12
+#define MFT_CPA         0x14
+#define MFT_CPB         0x16
+#define MFT_CPCFG       0x18
+#define MFT_INASEL      0x1a
+#define MFT_INBSEL      0x1c
+
+#define MFT_MCTRL_ALL   0x64
+#define MFT_ICLR_ALL    0x3f
+#define MFT_IEN_ALL     0x3f
+#define MFT_CPCFG_EQ_MODE 0x44
+
+#define MFT_CKC_C2CSEL  BIT(3)
+#define MFT_CKC_C1CSEL  BIT(0)
+
+#define MFT_ICTRL_TFPND BIT(5)
+#define MFT_ICTRL_TEPND BIT(4)
+#define MFT_ICTRL_TDPND BIT(3)
+#define MFT_ICTRL_TCPND BIT(2)
+#define MFT_ICTRL_TBPND BIT(1)
+#define MFT_ICTRL_TAPND BIT(0)
+
+#define MFT_MAX_CNT     0xffff
+#define MFT_TIMEOUT     0x5000
+
+#define DEFAULT_RPM     19800
+#define DEFAULT_PRSC    255
+#define MFT_PULSE_PER_REVOLUTION 2
+
+#define MAX_ERROR       1
+
 typedef struct PWMModule {
     int irq;
     uint64_t base_addr;
@@ -210,19 +254,36 @@ static uint64_t pwm_get_duty(QTestState *qts, int module_index, int pwm_index)
     return pwm_qom_get(qts, path, name);
 }
 
+static void mft_qom_set(QTestState *qts, int index, const char *name,
+                        uint32_t value)
+{
+    QDict *response;
+    char *path = g_strdup_printf("/machine/soc/mft[%d]", index);
+
+    g_test_message("Setting properties %s of mft[%d] with value %u",
+                   name, index, value);
+    response = qtest_qmp(qts, "{ 'execute': 'qom-set',"
+            " 'arguments': { 'path': %s, "
+            " 'property': %s, 'value': %u}}",
+            path, name, value);
+    /* The qom set message returns successfully. */
+    g_assert_true(qdict_haskey(response, "return"));
+}
+
 static uint32_t get_pll(uint32_t con)
 {
     return REF_HZ * PLL_FBDV(con) / (PLL_INDV(con) * PLL_OTDV1(con)
             * PLL_OTDV2(con));
 }
 
-static uint64_t read_pclk(QTestState *qts)
+static uint64_t read_pclk(QTestState *qts, bool mft)
 {
     uint64_t freq = REF_HZ;
     uint32_t clksel = qtest_readl(qts, CLK_BA + CLKSEL);
     uint32_t pllcon;
     uint32_t clkdiv1 = qtest_readl(qts, CLK_BA + CLKDIV1);
     uint32_t clkdiv2 = qtest_readl(qts, CLK_BA + CLKDIV2);
+    uint32_t apbdiv = mft ? APB4CKDIV(clkdiv2) : APB3CKDIV(clkdiv2);
 
     switch (CPUCKSEL(clksel)) {
     case 0:
@@ -241,7 +302,7 @@ static uint64_t read_pclk(QTestState *qts)
         g_assert_not_reached();
     }
 
-    freq >>= (CLK2CKDIV(clkdiv1) + CLK4CKDIV(clkdiv1) + APB3CKDIV(clkdiv2));
+    freq >>= (CLK2CKDIV(clkdiv1) + CLK4CKDIV(clkdiv1) + apbdiv);
 
     return freq;
 }
@@ -267,7 +328,7 @@ static uint32_t pwm_selector(uint32_t csr)
 static uint64_t pwm_compute_freq(QTestState *qts, uint32_t ppr, uint32_t csr,
         uint32_t cnr)
 {
-    return read_pclk(qts) / ((ppr + 1) * pwm_selector(csr) * (cnr + 1));
+    return read_pclk(qts, false) / ((ppr + 1) * pwm_selector(csr) * (cnr + 1));
 }
 
 static uint64_t pwm_compute_duty(uint32_t cnr, uint32_t cmr, bool inverted)
@@ -301,6 +362,28 @@ static void pwm_write(QTestState *qts, const TestData *td, unsigned offset,
     qtest_writel(qts, td->module->base_addr + offset, value);
 }
 
+static uint8_t mft_readb(QTestState *qts, int index, unsigned offset)
+{
+    return qtest_readb(qts, MFT_BA(index) + offset);
+}
+
+static uint16_t mft_readw(QTestState *qts, int index, unsigned offset)
+{
+    return qtest_readw(qts, MFT_BA(index) + offset);
+}
+
+static void mft_writeb(QTestState *qts, int index, unsigned offset,
+                        uint8_t value)
+{
+    qtest_writeb(qts, MFT_BA(index) + offset, value);
+}
+
+static void mft_writew(QTestState *qts, int index, unsigned offset,
+                        uint16_t value)
+{
+    return qtest_writew(qts, MFT_BA(index) + offset, value);
+}
+
 static uint32_t pwm_read_ppr(QTestState *qts, const TestData *td)
 {
     return extract32(pwm_read(qts, td, PPR), ppr_base[pwm_index(td->pwm)], 8);
@@ -351,11 +434,116 @@ static void pwm_write_cmr(QTestState *qts, const TestData *td, uint32_t value)
     pwm_write(qts, td, td->pwm->cmr_offset, value);
 }
 
+static int mft_compute_index(const TestData *td)
+{
+    int index = pwm_module_index(td->module) * ARRAY_SIZE(pwm_list) +
+                pwm_index(td->pwm);
+
+    g_assert_cmpint(index, <,
+                    ARRAY_SIZE(pwm_module_list) * ARRAY_SIZE(pwm_list));
+
+    return index;
+}
+
+static void mft_reset_counters(QTestState *qts, int index)
+{
+    mft_writew(qts, index, MFT_CNT1, MFT_MAX_CNT);
+    mft_writew(qts, index, MFT_CNT2, MFT_MAX_CNT);
+    mft_writew(qts, index, MFT_CRA, MFT_MAX_CNT);
+    mft_writew(qts, index, MFT_CRB, MFT_MAX_CNT);
+    mft_writew(qts, index, MFT_CPA, MFT_MAX_CNT - MFT_TIMEOUT);
+    mft_writew(qts, index, MFT_CPB, MFT_MAX_CNT - MFT_TIMEOUT);
+}
+
+static void mft_init(QTestState *qts, const TestData *td)
+{
+    int index = mft_compute_index(td);
+
+    /* Enable everything */
+    mft_writeb(qts, index, MFT_CKC, 0);
+    mft_writeb(qts, index, MFT_ICLR, MFT_ICLR_ALL);
+    mft_writeb(qts, index, MFT_MCTRL, MFT_MCTRL_ALL);
+    mft_writeb(qts, index, MFT_IEN, MFT_IEN_ALL);
+    mft_writeb(qts, index, MFT_INASEL, 0);
+    mft_writeb(qts, index, MFT_INBSEL, 0);
+
+    /* Set cpcfg to use EQ mode, same as kernel driver */
+    mft_writeb(qts, index, MFT_CPCFG, MFT_CPCFG_EQ_MODE);
+
+    /* Write default counters, timeout and prescaler */
+    mft_reset_counters(qts, index);
+    mft_writeb(qts, index, MFT_PRSC, DEFAULT_PRSC);
+
+    /* Write default max rpm via QMP */
+    mft_qom_set(qts, index, "max_rpm[0]", DEFAULT_RPM);
+    mft_qom_set(qts, index, "max_rpm[1]", DEFAULT_RPM);
+}
+
+static int32_t mft_compute_cnt(uint32_t rpm, uint64_t clk)
+{
+    uint64_t cnt;
+
+    if (rpm == 0) {
+        return -1;
+    }
+
+    cnt = clk * 60 / ((DEFAULT_PRSC + 1) * rpm * MFT_PULSE_PER_REVOLUTION);
+    if (cnt >= MFT_TIMEOUT) {
+        return -1;
+    }
+    return MFT_MAX_CNT - cnt;
+}
+
+static void mft_verify_rpm(QTestState *qts, const TestData *td, uint64_t duty)
+{
+    int index = mft_compute_index(td);
+    uint16_t cnt, cr;
+    uint32_t rpm = DEFAULT_RPM * duty / MAX_DUTY;
+    uint64_t clk = read_pclk(qts, true);
+    int32_t expected_cnt = mft_compute_cnt(rpm, clk);
+
+    qtest_irq_intercept_in(qts, "/machine/soc/a9mpcore/gic");
+    g_test_message(
+        "verifying rpm for mft[%d]: clk: %lu, duty: %lu, rpm: %u, cnt: %d",
+        index, clk, duty, rpm, expected_cnt);
+
+    /* Verify rpm for fan A */
+    /* Stop capture */
+    mft_writeb(qts, index, MFT_CKC, 0);
+    mft_writeb(qts, index, MFT_ICLR, MFT_ICLR_ALL);
+    mft_reset_counters(qts, index);
+    g_assert_cmphex(mft_readw(qts, index, MFT_CNT1), ==, MFT_MAX_CNT);
+    g_assert_cmphex(mft_readw(qts, index, MFT_CRA), ==, MFT_MAX_CNT);
+    g_assert_cmphex(mft_readw(qts, index, MFT_CPA), ==,
+                    MFT_MAX_CNT - MFT_TIMEOUT);
+    /* Start capture */
+    mft_writeb(qts, index, MFT_CKC, MFT_CKC_C1CSEL);
+    g_assert_true(qtest_get_irq(qts, MFT_IRQ(index)));
+    if (expected_cnt == -1) {
+        g_assert_cmphex(mft_readb(qts, index, MFT_ICTRL), ==, MFT_ICTRL_TEPND);
+    } else {
+        g_assert_cmphex(mft_readb(qts, index, MFT_ICTRL), ==, MFT_ICTRL_TAPND);
+        cnt = mft_readw(qts, index, MFT_CNT1);
+        /*
+         * Due to error in clock measurement and rounding, we might have a small
+         * error in measuring RPM.
+         */
+        g_assert_cmphex(cnt + MAX_ERROR, >=, expected_cnt);
+        g_assert_cmphex(cnt, <=, expected_cnt + MAX_ERROR);
+        cr = mft_readw(qts, index, MFT_CRA);
+        g_assert_cmphex(cnt, ==, cr);
+    }
+
+    /* Verify rpm for fan B */
+
+    qtest_irq_intercept_out(qts, "/machine/soc/a9mpcore/gic");
+}
+
 /* Check pwm registers can be reset to default value */
 static void test_init(gconstpointer test_data)
 {
     const TestData *td = test_data;
-    QTestState *qts = qtest_init("-machine quanta-gsj");
+    QTestState *qts = qtest_init("-machine npcm750-evb");
     int module = pwm_module_index(td->module);
     int pwm = pwm_index(td->pwm);
 
@@ -369,7 +557,7 @@ static void test_init(gconstpointer test_data)
 static void test_oneshot(gconstpointer test_data)
 {
     const TestData *td = test_data;
-    QTestState *qts = qtest_init("-machine quanta-gsj");
+    QTestState *qts = qtest_init("-machine npcm750-evb");
     int module = pwm_module_index(td->module);
     int pwm = pwm_index(td->pwm);
     uint32_t ppr, csr, pcr;
@@ -400,13 +588,15 @@ static void test_oneshot(gconstpointer test_data)
 static void test_toggle(gconstpointer test_data)
 {
     const TestData *td = test_data;
-    QTestState *qts = qtest_init("-machine quanta-gsj");
+    QTestState *qts = qtest_init("-machine npcm750-evb");
     int module = pwm_module_index(td->module);
     int pwm = pwm_index(td->pwm);
     uint32_t ppr, csr, pcr, cnr, cmr;
     int i, j, k, l;
     uint64_t expected_freq, expected_duty;
 
+    mft_init(qts, td);
+
     pcr = CH_EN | CH_MOD;
     for (i = 0; i < ARRAY_SIZE(ppr_list); ++i) {
         ppr = ppr_list[i];
@@ -440,6 +630,9 @@ static void test_toggle(gconstpointer test_data)
                                 ==, expected_freq);
                     }
 
+                    /* Test MFT's RPM is correct. */
+                    mft_verify_rpm(qts, td, expected_duty);
+
                     /* Test inverted mode */
                     expected_duty = pwm_compute_duty(cnr, cmr, true);
                     pwm_write_pcr(qts, td, pcr | CH_INV);
-- 
2.31.0.rc2.261.g7f71774620-goog

Re: [PATCH v2 0/5] hw/arm: Add NPCM7XX Tachometer Device

[Peter Maydell]

On Thu, 11 Mar 2021 at 18:08, Hao Wu <wuhaotsh@google.com> wrote:
>
> This patch set implements the Tachometer (a.k.a Multi Functional Timer/MFT)
> device in NPCM7XX SoC. This device is used by NPCM7XX boards to measure
> the RPM of PWM fans.
>
> To provide the RPM of a certain fan, since RPM = MAX_RPM * duty_percentage.
> We convert the duty output in NPCM7XX PWM module into GPIOs and feed them
> into the MFT module.
>
> The connection of PWM modules and fan modules are derived from their specific
> Linux device trees and coded in hw/arm/npcm7xx_boards.c.
>
> We amend the QTest for the PWM module to include verifying the reading from
> the Tachometer is correct.



Applied to target-arm.next, thanks.

-- PMM

Re: [PATCH v2 5/5] tests/qtest: Test PWM fan RPM using MFT in PWM test

[Peter Maydell]

On Thu, 11 Mar 2021 at 18:09, Hao Wu <wuhaotsh@google.com> wrote:
>
> This patch adds testing of PWM fan RPMs in the existing npcm7xx pwm
> test. It tests whether the MFT module can measure correct fan values
> for a PWM fan in NPCM7XX boards.
>
> Reviewed-by: Doug Evans <dje@google.com>
> Reviewed-by: Tyrone Ting <kfting@nuvoton.com>
> Signed-off-by: Hao Wu <wuhaotsh@google.com>
> Reviewed-by: Peter Maydell <peter.maydell@linaro.org>


> +static void mft_verify_rpm(QTestState *qts, const TestData *td, uint64_t duty)
> +{
> +    int index = mft_compute_index(td);
> +    uint16_t cnt, cr;
> +    uint32_t rpm = DEFAULT_RPM * duty / MAX_DUTY;
> +    uint64_t clk = read_pclk(qts, true);
> +    int32_t expected_cnt = mft_compute_cnt(rpm, clk);
> +
> +    qtest_irq_intercept_in(qts, "/machine/soc/a9mpcore/gic");
> +    g_test_message(
> +        "verifying rpm for mft[%d]: clk: %lu, duty: %lu, rpm: %u, cnt: %d",
> +        index, clk, duty, rpm, expected_cnt);

Hi -- this won't build on 32-bit hosts (or on OSX, and it warns on OpenBSD),
because uint64_t and 'long' aren't the same thing. You need to use the
PRIu64 etc macros when printing uint64_t values, so the argument type and
the format string match.

I've fixed this up in the pullreq.

thanks
-- PMM

Re: [PATCH v2 0/5] hw/arm: Add NPCM7XX Tachometer Device

[Richard Henderson]

On Thu, 11 Mar 2021 at 13:11, Hao Wu <wuhaotsh@google.com> wrote:
>
> This patch set implements the Tachometer (a.k.a Multi Functional Timer/MFT)
> device in NPCM7XX SoC. This device is used by NPCM7XX boards to measure
> the RPM of PWM fans.
>
> To provide the RPM of a certain fan, since RPM = MAX_RPM * duty_percentage.
> We convert the duty output in NPCM7XX PWM module into GPIOs and feed them
> into the MFT module.
>
> The connection of PWM modules and fan modules are derived from their specific
> Linux device trees and coded in hw/arm/npcm7xx_boards.c.
>
> We amend the QTest for the PWM module to include verifying the reading from
> the Tachometer is correct.
>
> Changes since v1:
> - Split implementation of device and addition to board file to separate patches
> - Adapt to new Clock API and address conflicts
> - Use the new clock_ns_to_ticks API to calculate tachometer counts
>
> Hao Wu (5):
>   hw/misc: Add GPIOs for duty in NPCM7xx PWM
>   hw/misc: Add NPCM7XX MFT Module
>   hw/arm: Add MFT device to NPCM7xx Soc
>   hw/arm: Connect PWM fans in NPCM7XX boards
>   tests/qtest: Test PWM fan RPM using MFT in PWM test
>
>  docs/system/arm/nuvoton.rst    |   2 +-
>  hw/arm/npcm7xx.c               |  45 ++-
>  hw/arm/npcm7xx_boards.c        |  99 ++++++
>  hw/misc/meson.build            |   1 +
>  hw/misc/npcm7xx_mft.c          | 540 +++++++++++++++++++++++++++++++++
>  hw/misc/npcm7xx_pwm.c          |   4 +
>  hw/misc/trace-events           |   8 +
>  include/hw/arm/npcm7xx.h       |  13 +-
>  include/hw/misc/npcm7xx_mft.h  |  70 +++++
>  include/hw/misc/npcm7xx_pwm.h  |   4 +-
>  tests/qtest/npcm7xx_pwm-test.c | 205 ++++++++++++-
>  11 files changed, 974 insertions(+), 17 deletions(-)
>  create mode 100644 hw/misc/npcm7xx_mft.c
>  create mode 100644 include/hw/misc/npcm7xx_mft.h

Thanks, queued to target-arm.next.

r~

Re: [PATCH v2 0/5] hw/arm: Add NPCM7XX Tachometer Device

[Hao Wu]

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Is this reply to a wrong thread? I thought it was applied a long time ago.

Thanks,

On Mon, Nov 1, 2021 at 10:33 AM Richard Henderson <
richard.henderson@linaro.org> wrote:

> On Thu, 11 Mar 2021 at 13:11, Hao Wu <wuhaotsh@google.com> wrote:
> >
> > This patch set implements the Tachometer (a.k.a Multi Functional
> Timer/MFT)
> > device in NPCM7XX SoC. This device is used by NPCM7XX boards to measure
> > the RPM of PWM fans.
> >
> > To provide the RPM of a certain fan, since RPM = MAX_RPM *
> duty_percentage.
> > We convert the duty output in NPCM7XX PWM module into GPIOs and feed them
> > into the MFT module.
> >
> > The connection of PWM modules and fan modules are derived from their
> specific
> > Linux device trees and coded in hw/arm/npcm7xx_boards.c.
> >
> > We amend the QTest for the PWM module to include verifying the reading
> from
> > the Tachometer is correct.
> >
> > Changes since v1:
> > - Split implementation of device and addition to board file to separate
> patches
> > - Adapt to new Clock API and address conflicts
> > - Use the new clock_ns_to_ticks API to calculate tachometer counts
> >
> > Hao Wu (5):
> >   hw/misc: Add GPIOs for duty in NPCM7xx PWM
> >   hw/misc: Add NPCM7XX MFT Module
> >   hw/arm: Add MFT device to NPCM7xx Soc
> >   hw/arm: Connect PWM fans in NPCM7XX boards
> >   tests/qtest: Test PWM fan RPM using MFT in PWM test
> >
> >  docs/system/arm/nuvoton.rst    |   2 +-
> >  hw/arm/npcm7xx.c               |  45 ++-
> >  hw/arm/npcm7xx_boards.c        |  99 ++++++
> >  hw/misc/meson.build            |   1 +
> >  hw/misc/npcm7xx_mft.c          | 540 +++++++++++++++++++++++++++++++++
> >  hw/misc/npcm7xx_pwm.c          |   4 +
> >  hw/misc/trace-events           |   8 +
> >  include/hw/arm/npcm7xx.h       |  13 +-
> >  include/hw/misc/npcm7xx_mft.h  |  70 +++++
> >  include/hw/misc/npcm7xx_pwm.h  |   4 +-
> >  tests/qtest/npcm7xx_pwm-test.c | 205 ++++++++++++-
> >  11 files changed, 974 insertions(+), 17 deletions(-)
> >  create mode 100644 hw/misc/npcm7xx_mft.c
> >  create mode 100644 include/hw/misc/npcm7xx_mft.h
>
> Thanks, queued to target-arm.next.
>
> r~
>

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Re: [PATCH v2 0/5] hw/arm: Add NPCM7XX Tachometer Device

[Richard Henderson]

On 11/1/21 1:50 PM, Hao Wu wrote:
> Is this reply to a wrong thread? I thought it was applied a long time ago.

Probably.

r~

> 
> Thanks,
> 
> On Mon, Nov 1, 2021 at 10:33 AM Richard Henderson <richard.henderson@linaro.org 
> <mailto:richard.henderson@linaro.org>> wrote:
> 
>     On Thu, 11 Mar 2021 at 13:11, Hao Wu <wuhaotsh@google.com
>     <mailto:wuhaotsh@google.com>> wrote:
>      >
>      > This patch set implements the Tachometer (a.k.a Multi Functional Timer/MFT)
>      > device in NPCM7XX SoC. This device is used by NPCM7XX boards to measure
>      > the RPM of PWM fans.
>      >
>      > To provide the RPM of a certain fan, since RPM = MAX_RPM * duty_percentage.
>      > We convert the duty output in NPCM7XX PWM module into GPIOs and feed them
>      > into the MFT module.
>      >
>      > The connection of PWM modules and fan modules are derived from their specific
>      > Linux device trees and coded in hw/arm/npcm7xx_boards.c.
>      >
>      > We amend the QTest for the PWM module to include verifying the reading from
>      > the Tachometer is correct.
>      >
>      > Changes since v1:
>      > - Split implementation of device and addition to board file to separate patches
>      > - Adapt to new Clock API and address conflicts
>      > - Use the new clock_ns_to_ticks API to calculate tachometer counts
>      >
>      > Hao Wu (5):
>      >   hw/misc: Add GPIOs for duty in NPCM7xx PWM
>      >   hw/misc: Add NPCM7XX MFT Module
>      >   hw/arm: Add MFT device to NPCM7xx Soc
>      >   hw/arm: Connect PWM fans in NPCM7XX boards
>      >   tests/qtest: Test PWM fan RPM using MFT in PWM test
>      >
>      >  docs/system/arm/nuvoton.rst    |   2 +-
>      >  hw/arm/npcm7xx.c               |  45 ++-
>      >  hw/arm/npcm7xx_boards.c        |  99 ++++++
>      >  hw/misc/meson.build            |   1 +
>      >  hw/misc/npcm7xx_mft.c          | 540 +++++++++++++++++++++++++++++++++
>      >  hw/misc/npcm7xx_pwm.c          |   4 +
>      >  hw/misc/trace-events           |   8 +
>      >  include/hw/arm/npcm7xx.h       |  13 +-
>      >  include/hw/misc/npcm7xx_mft.h  |  70 +++++
>      >  include/hw/misc/npcm7xx_pwm.h  |   4 +-
>      >  tests/qtest/npcm7xx_pwm-test.c | 205 ++++++++++++-
>      >  11 files changed, 974 insertions(+), 17 deletions(-)
>      >  create mode 100644 hw/misc/npcm7xx_mft.c
>      >  create mode 100644 include/hw/misc/npcm7xx_mft.h
> 
>     Thanks, queued to target-arm.next.
> 
>     r~
> 

Re: [PATCH v2 0/5] hw/arm: Add NPCM7XX Tachometer Device

[Peter Maydell]

On Tue, 2 Nov 2021 at 10:03, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> On 11/1/21 1:50 PM, Hao Wu wrote:
> > Is this reply to a wrong thread? I thought it was applied a long time ago.
>
> Probably.

Possibly you meant this 5-patch NPCM7xx series ?
https://patchew.org/QEMU/20211008002628.1958285-1-wuhaotsh@google.com/
("[PATCH v2 0/5] hw/arm: Add MMC device for NPCM7XX boards")

which has been reviewed and is ready to go in I think.

thanks
-- PMM

Re: [PATCH v2 0/5] hw/arm: Add NPCM7XX Tachometer Device

[Richard Henderson]

On 11/2/21 6:44 AM, Peter Maydell wrote:
> On Tue, 2 Nov 2021 at 10:03, Richard Henderson
> <richard.henderson@linaro.org> wrote:
>>
>> On 11/1/21 1:50 PM, Hao Wu wrote:
>>> Is this reply to a wrong thread? I thought it was applied a long time ago.
>>
>> Probably.
> 
> Possibly you meant this 5-patch NPCM7xx series ?
> https://patchew.org/QEMU/20211008002628.1958285-1-wuhaotsh@google.com/
> ("[PATCH v2 0/5] hw/arm: Add MMC device for NPCM7XX boards")
> 
> which has been reviewed and is ready to go in I think.

Yep, that's the one.


r~