[PATCH 1/3] hw/intc: openpic: Correct the reset value of IPIDR for FSL chipset

[PATCH 1/3] hw/intc: openpic: Correct the reset value of IPIDR for FSL chipset

[Bin Meng]

From: Bin Meng <bin.meng@windriver.com>

The reset value of IPIDR should be zero for Freescale chipset, per
the following 2 manuals I checked:

- P2020RM (https://www.nxp.com/webapp/Download?colCode=P2020RM)
- P4080RM (https://www.nxp.com/webapp/Download?colCode=P4080RM)

Currently it is set to 1, which leaves the IPI enabled on core 0
after power-on reset. Such may cause unexpected interrupt to be
delivered to core 0 if the IPI is triggered from core 0 to other
cores later.

Fixes: ffd5e9fe0276 ("openpic: Reset IRQ source private members")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/584
Signed-off-by: Bin Meng <bin.meng@windriver.com>
---

 hw/intc/openpic.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/hw/intc/openpic.c b/hw/intc/openpic.c
index 9b4c17854d..2790c6710a 100644
--- a/hw/intc/openpic.c
+++ b/hw/intc/openpic.c
@@ -1276,6 +1276,15 @@ static void openpic_reset(DeviceState *d)
             break;
         }
 
+        /* Mask all IPI interrupts for Freescale OpenPIC */
+        if ((opp->model == OPENPIC_MODEL_FSL_MPIC_20) ||
+            (opp->model == OPENPIC_MODEL_FSL_MPIC_42)) {
+            if (i >= opp->irq_ipi0 && i < opp->irq_tim0) {
+                write_IRQreg_idr(opp, i, 0);
+                continue;
+            }
+        }
+
         write_IRQreg_idr(opp, i, opp->idr_reset);
     }
     /* Initialise IRQ destinations */
-- 
2.25.1

[PATCH 2/3] hw/intc: openpic: Drop Raven related codes

[Bin Meng]

From: Bin Meng <bin.meng@windriver.com>

There is no machine that uses Motorola MCP750 (aka Raven) model.
Drop the related codes.

While we are here, drop the mentioning of Intel GW80314 I/O
companion chip in the comments as it has been obsolete for years,
and correct a typo too.

Signed-off-by: Bin Meng <bin.meng@windirver.com>
---

 include/hw/ppc/openpic.h | 16 ----------------
 hw/intc/openpic.c        | 28 +---------------------------
 2 files changed, 1 insertion(+), 43 deletions(-)

diff --git a/include/hw/ppc/openpic.h b/include/hw/ppc/openpic.h
index 74ff44bff0..f89802a15c 100644
--- a/include/hw/ppc/openpic.h
+++ b/include/hw/ppc/openpic.h
@@ -21,7 +21,6 @@ enum {
 
 typedef struct IrqLines { qemu_irq irq[OPENPIC_OUTPUT_NB]; } IrqLines;
 
-#define OPENPIC_MODEL_RAVEN       0
 #define OPENPIC_MODEL_FSL_MPIC_20 1
 #define OPENPIC_MODEL_FSL_MPIC_42 2
 #define OPENPIC_MODEL_KEYLARGO    3
@@ -32,13 +31,6 @@ typedef struct IrqLines { qemu_irq irq[OPENPIC_OUTPUT_NB]; } IrqLines;
 #define OPENPIC_MAX_IRQ     (OPENPIC_MAX_SRC + OPENPIC_MAX_IPI + \
                              OPENPIC_MAX_TMR)
 
-/* Raven */
-#define RAVEN_MAX_CPU      2
-#define RAVEN_MAX_EXT     48
-#define RAVEN_MAX_IRQ     64
-#define RAVEN_MAX_TMR      OPENPIC_MAX_TMR
-#define RAVEN_MAX_IPI      OPENPIC_MAX_IPI
-
 /* KeyLargo */
 #define KEYLARGO_MAX_CPU  4
 #define KEYLARGO_MAX_EXT  64
@@ -49,14 +41,6 @@ typedef struct IrqLines { qemu_irq irq[OPENPIC_OUTPUT_NB]; } IrqLines;
 /* Timers don't exist but this makes the code happy... */
 #define KEYLARGO_TMR_IRQ  (KEYLARGO_IPI_IRQ + KEYLARGO_MAX_IPI)
 
-/* Interrupt definitions */
-#define RAVEN_FE_IRQ     (RAVEN_MAX_EXT)     /* Internal functional IRQ */
-#define RAVEN_ERR_IRQ    (RAVEN_MAX_EXT + 1) /* Error IRQ */
-#define RAVEN_TMR_IRQ    (RAVEN_MAX_EXT + 2) /* First timer IRQ */
-#define RAVEN_IPI_IRQ    (RAVEN_TMR_IRQ + RAVEN_MAX_TMR) /* First IPI IRQ */
-/* First doorbell IRQ */
-#define RAVEN_DBL_IRQ    (RAVEN_IPI_IRQ + (RAVEN_MAX_CPU * RAVEN_MAX_IPI))
-
 typedef struct FslMpicInfo {
     int max_ext;
 } FslMpicInfo;
diff --git a/hw/intc/openpic.c b/hw/intc/openpic.c
index 2790c6710a..23eafb32bd 100644
--- a/hw/intc/openpic.c
+++ b/hw/intc/openpic.c
@@ -25,12 +25,8 @@
 /*
  *
  * Based on OpenPic implementations:
- * - Intel GW80314 I/O companion chip developer's manual
  * - Motorola MPC8245 & MPC8540 user manuals.
- * - Motorola MCP750 (aka Raven) programmer manual.
- * - Motorola Harrier programmer manuel
- *
- * Serial interrupts, as implemented in Raven chipset are not supported yet.
+ * - Motorola Harrier programmer manual
  *
  */
 
@@ -1564,28 +1560,6 @@ static void openpic_realize(DeviceState *dev, Error **errp)
 
         break;
 
-    case OPENPIC_MODEL_RAVEN:
-        opp->nb_irqs = RAVEN_MAX_EXT;
-        opp->vid = VID_REVISION_1_3;
-        opp->vir = VIR_GENERIC;
-        opp->vector_mask = 0xFF;
-        opp->tfrr_reset = 4160000;
-        opp->ivpr_reset = IVPR_MASK_MASK | IVPR_MODE_MASK;
-        opp->idr_reset = 0;
-        opp->max_irq = RAVEN_MAX_IRQ;
-        opp->irq_ipi0 = RAVEN_IPI_IRQ;
-        opp->irq_tim0 = RAVEN_TMR_IRQ;
-        opp->brr1 = -1;
-        opp->mpic_mode_mask = GCR_MODE_MIXED;
-
-        if (opp->nb_cpus != 1) {
-            error_setg(errp, "Only UP supported today");
-            return;
-        }
-
-        map_list(opp, list_le, &list_count);
-        break;
-
     case OPENPIC_MODEL_KEYLARGO:
         opp->nb_irqs = KEYLARGO_MAX_EXT;
         opp->vid = VID_REVISION_1_2;
-- 
2.25.1

[PATCH 3/3] hw/intc: openpic: Clean up the styles

[Bin Meng]

From: Bin Meng <bin.meng@windriver.com>

Correct the multi-line comment format. No functional changes.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
---

 include/hw/ppc/openpic.h |  9 ++++---
 hw/intc/openpic.c        | 55 +++++++++++++++++++++++++---------------
 2 files changed, 40 insertions(+), 24 deletions(-)

diff --git a/include/hw/ppc/openpic.h b/include/hw/ppc/openpic.h
index f89802a15c..ebdaf8a493 100644
--- a/include/hw/ppc/openpic.h
+++ b/include/hw/ppc/openpic.h
@@ -51,7 +51,8 @@ typedef enum IRQType {
     IRQ_TYPE_FSLSPECIAL,    /* FSL timer/IPI interrupt, edge, no polarity */
 } IRQType;
 
-/* Round up to the nearest 64 IRQs so that the queue length
+/*
+ * Round up to the nearest 64 IRQs so that the queue length
  * won't change when moving between 32 and 64 bit hosts.
  */
 #define IRQQUEUE_SIZE_BITS ((OPENPIC_MAX_IRQ + 63) & ~63)
@@ -101,8 +102,10 @@ typedef struct OpenPICTimer {
     bool                  qemu_timer_active; /* Is the qemu_timer is running? */
     struct QEMUTimer     *qemu_timer;
     struct OpenPICState  *opp;          /* Device timer is part of. */
-    /* The QEMU_CLOCK_VIRTUAL time (in ns) corresponding to the last
-       current_count written or read, only defined if qemu_timer_active. */
+    /*
+     * The QEMU_CLOCK_VIRTUAL time (in ns) corresponding to the last
+     * current_count written or read, only defined if qemu_timer_active.
+     */
     uint64_t              origin_time;
 } OpenPICTimer;
 
diff --git a/hw/intc/openpic.c b/hw/intc/openpic.c
index 23eafb32bd..49504e740f 100644
--- a/hw/intc/openpic.c
+++ b/hw/intc/openpic.c
@@ -47,7 +47,7 @@
 #include "qemu/timer.h"
 #include "qemu/error-report.h"
 
-//#define DEBUG_OPENPIC
+/* #define DEBUG_OPENPIC */
 
 #ifdef DEBUG_OPENPIC
 static const int debug_openpic = 1;
@@ -118,7 +118,8 @@ static FslMpicInfo fsl_mpic_42 = {
 #define ILR_INTTGT_CINT   0x01 /* critical */
 #define ILR_INTTGT_MCP    0x02 /* machine check */
 
-/* The currently supported INTTGT values happen to be the same as QEMU's
+/*
+ * The currently supported INTTGT values happen to be the same as QEMU's
  * openpic output codes, but don't depend on this.  The output codes
  * could change (unlikely, but...) or support could be added for
  * more INTTGT values.
@@ -177,10 +178,11 @@ static void openpic_cpu_write_internal(void *opaque, hwaddr addr,
                                        uint32_t val, int idx);
 static void openpic_reset(DeviceState *d);
 
-/* Convert between openpic clock ticks and nanosecs.  In the hardware the clock
-   frequency is driven by board inputs to the PIC which the PIC would then
-   divide by 4 or 8.  For now hard code to 25MZ.
-*/
+/*
+ * Convert between openpic clock ticks and nanosecs.  In the hardware the clock
+ * frequency is driven by board inputs to the PIC which the PIC would then
+ * divide by 4 or 8.  For now hard code to 25MZ.
+ */
 #define OPENPIC_TIMER_FREQ_MHZ 25
 #define OPENPIC_TIMER_NS_PER_TICK (1000 / OPENPIC_TIMER_FREQ_MHZ)
 static inline uint64_t ns_to_ticks(uint64_t ns)
@@ -253,7 +255,8 @@ static void IRQ_local_pipe(OpenPICState *opp, int n_CPU, int n_IRQ,
                 __func__, src->output, n_IRQ, active, was_active,
                 dst->outputs_active[src->output]);
 
-        /* On Freescale MPIC, critical interrupts ignore priority,
+        /*
+         * On Freescale MPIC, critical interrupts ignore priority,
          * IACK, EOI, etc.  Before MPIC v4.1 they also ignore
          * masking.
          */
@@ -276,7 +279,8 @@ static void IRQ_local_pipe(OpenPICState *opp, int n_CPU, int n_IRQ,
 
     priority = IVPR_PRIORITY(src->ivpr);
 
-    /* Even if the interrupt doesn't have enough priority,
+    /*
+     * Even if the interrupt doesn't have enough priority,
      * it is still raised, in case ctpr is lowered later.
      */
     if (active) {
@@ -408,7 +412,8 @@ static void openpic_set_irq(void *opaque, int n_IRQ, int level)
         }
 
         if (src->output != OPENPIC_OUTPUT_INT) {
-            /* Edge-triggered interrupts shouldn't be used
+            /*
+             * Edge-triggered interrupts shouldn't be used
              * with non-INT delivery, but just in case,
              * try to make it do something sane rather than
              * cause an interrupt storm.  This is close to
@@ -501,7 +506,8 @@ static inline void write_IRQreg_ivpr(OpenPICState *opp, int n_IRQ, uint32_t val)
 {
     uint32_t mask;
 
-    /* NOTE when implementing newer FSL MPIC models: starting with v4.0,
+    /*
+     * NOTE when implementing newer FSL MPIC models: starting with v4.0,
      * the polarity bit is read-only on internal interrupts.
      */
     mask = IVPR_MASK_MASK | IVPR_PRIORITY_MASK | IVPR_SENSE_MASK |
@@ -511,7 +517,8 @@ static inline void write_IRQreg_ivpr(OpenPICState *opp, int n_IRQ, uint32_t val)
     opp->src[n_IRQ].ivpr =
         (opp->src[n_IRQ].ivpr & IVPR_ACTIVITY_MASK) | (val & mask);
 
-    /* For FSL internal interrupts, The sense bit is reserved and zero,
+    /*
+     * For FSL internal interrupts, The sense bit is reserved and zero,
      * and the interrupt is always level-triggered.  Timers and IPIs
      * have no sense or polarity bits, and are edge-triggered.
      */
@@ -695,16 +702,20 @@ static void qemu_timer_cb(void *opaque)
     openpic_set_irq(opp, n_IRQ, 0);
 }
 
-/* If enabled is true, arranges for an interrupt to be raised val clocks into
-   the future, if enabled is false cancels the timer. */
+/*
+ * If enabled is true, arranges for an interrupt to be raised val clocks into
+ * the future, if enabled is false cancels the timer.
+ */
 static void openpic_tmr_set_tmr(OpenPICTimer *tmr, uint32_t val, bool enabled)
 {
     uint64_t ns = ticks_to_ns(val & ~TCCR_TOG);
-    /* A count of zero causes a timer to be set to expire immediately.  This
-       effectively stops the simulation since the timer is constantly expiring
-       which prevents guest code execution, so we don't honor that
-       configuration.  On real hardware, this situation would generate an
-       interrupt on every clock cycle if the interrupt was unmasked. */
+    /*
+     * A count of zero causes a timer to be set to expire immediately.  This
+     * effectively stops the simulation since the timer is constantly expiring
+     * which prevents guest code execution, so we don't honor that
+     * configuration.  On real hardware, this situation would generate an
+     * interrupt on every clock cycle if the interrupt was unmasked.
+     */
     if ((ns == 0) || !enabled) {
         tmr->qemu_timer_active = false;
         tmr->tccr = tmr->tccr & TCCR_TOG;
@@ -717,8 +728,10 @@ static void openpic_tmr_set_tmr(OpenPICTimer *tmr, uint32_t val, bool enabled)
     }
 }
 
-/* Returns the currrent tccr value, i.e., timer value (in clocks) with
-   appropriate TOG. */
+/*
+ * Returns the currrent tccr value, i.e., timer value (in clocks) with
+ * appropriate TOG.
+ */
 static uint64_t openpic_tmr_get_timer(OpenPICTimer *tmr)
 {
     uint64_t retval;
@@ -1309,7 +1322,7 @@ static void openpic_reset(DeviceState *d)
 typedef struct MemReg {
     const char             *name;
     MemoryRegionOps const  *ops;
-    hwaddr      start_addr;
+    hwaddr                  start_addr;
     ram_addr_t              size;
 } MemReg;
 
-- 
2.25.1

Re: [PATCH 2/3] hw/intc: openpic: Drop Raven related codes

[Bin Meng]

On Sat, Sep 18, 2021 at 11:02 AM Bin Meng <bmeng.cn@gmail.com> wrote:
>
> From: Bin Meng <bin.meng@windriver.com>
>
> There is no machine that uses Motorola MCP750 (aka Raven) model.
> Drop the related codes.
>
> While we are here, drop the mentioning of Intel GW80314 I/O
> companion chip in the comments as it has been obsolete for years,
> and correct a typo too.
>
> Signed-off-by: Bin Meng <bin.meng@windirver.com>

Oops, email address is wrong.

Please drop this. Will resend.

Regards,
Bin