riscv: Add CLINT and PLIC support

The CLINT and PLIC need some per-processor state.

Update #3433.

bsps/riscv/riscv/clock/clockdrv.c

@@ -33,6 +33,7 @@
  */
 
 #include <rtems/timecounter.h>
+#include <rtems/score/cpuimpl.h>
 #include <rtems/score/riscv-utility.h>
 
 #include <bsp/fatal.h>
@@ -40,8 +41,6 @@
 #include <bsp/irq.h>
 #include <bsp/riscv.h>
 
-#include <dev/irq/clint.h>
-
 #include <libfdt.h>
 
 /* This is defined in dev/clock/clockimpl.h */
@@ -49,7 +48,7 @@ void Clock_isr(void *arg);
 
 typedef struct {
   struct timecounter base;
-  volatile clint_regs *clint;
+  volatile RISCV_CLINT_regs *clint;
 } riscv_timecounter;
 
 static riscv_timecounter riscv_clock_tc;
@@ -58,7 +57,7 @@ static uint32_t riscv_clock_interval;
 
 static void riscv_clock_at_tick(riscv_timecounter *tc)
 {
-  volatile clint_regs *clint;
+  volatile RISCV_CLINT_regs *clint;
   uint64_t cmp;
 
   clint = tc->clint;
@@ -94,7 +93,7 @@ static void riscv_clock_handler_install(void)
 static uint32_t riscv_clock_get_timecount(struct timecounter *base)
 {
   riscv_timecounter *tc;
-  volatile clint_regs *clint;
+  volatile RISCV_CLINT_regs *clint;
 
   tc = (riscv_timecounter *) base;
   clint = tc->clint;

bsps/riscv/riscv/headers.am

@@ -10,10 +10,6 @@ include_bsp_HEADERS =
 include_bsp_HEADERS += ../../../../../../bsps/riscv/riscv/include/bsp/irq.h
 include_bsp_HEADERS += ../../../../../../bsps/riscv/riscv/include/bsp/riscv.h
 
-include_dev_irqdir = $(includedir)/dev/irq
-include_dev_irq_HEADERS =
-include_dev_irq_HEADERS += ../../../../../../bsps/riscv/riscv/include/dev/irq/clint.h
-
 include_dev_serialdir = $(includedir)/dev/serial
 include_dev_serial_HEADERS =
 include_dev_serial_HEADERS += ../../../../../../bsps/riscv/riscv/include/dev/serial/htif.h

bsps/riscv/riscv/include/dev/irq/clint.h

@@ -1,53 +0,0 @@
-/*
- * Copyright (c) 2018 embedded brains GmbH
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <stdint.h>
-
-#ifndef DEV_IRQ_CLINT_H
-#define DEV_IRQ_CLINT_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-typedef struct {
-  uint32_t msip[4096];
-  union {
-    uint64_t val_64;
-    uint32_t val_32[2];
-  } mtimecmp[2048];
-  uint32_t reserved_8000[4094];
-  union {
-    uint64_t val_64;
-    uint32_t val_32[2];
-  } mtime;
-  uint32_t reserved_c000[4096];
-} clint_regs;
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-
-#endif /* DEV_IRQ_CLINT_H */

cpukit/score/cpu/riscv/include/rtems/score/cpuimpl.h

@@ -34,10 +34,14 @@
 
 #include <rtems/score/cpu.h>
 
-#ifdef __riscv_atomic
+#if defined(__riscv_atomic) && __riscv_xlen == 64
+#define CPU_PER_CPU_CONTROL_SIZE 48
+#elif defined(__riscv_atomic) && __riscv_xlen == 32
+#define CPU_PER_CPU_CONTROL_SIZE 32
+#elif __riscv_xlen == 64
+#define CPU_PER_CPU_CONTROL_SIZE 32
+#elif __riscv_xlen == 32
 #define CPU_PER_CPU_CONTROL_SIZE 16
-#else
-#define CPU_PER_CPU_CONTROL_SIZE 0
 #endif
 
 #ifdef RTEMS_SMP
@@ -282,12 +286,48 @@
 extern "C" {
 #endif
 
-#ifdef __riscv_atomic
+/* Core Local Interruptor (CLINT) */
+
+typedef union {
+  uint64_t val_64;
+  uint32_t val_32[2];
+} RISCV_CLINT_timer_reg;
+
 typedef struct {
+  uint32_t msip[4096];
+  RISCV_CLINT_timer_reg mtimecmp[2048];
+  uint32_t reserved_8000[4094];
+  RISCV_CLINT_timer_reg mtime;
+  uint32_t reserved_c000[4096];
+} RISCV_CLINT_regs;
+
+/* Platform-Level Interrupt Controller (PLIC) */
+
+#define RISCV_PLIC_MAX_INTERRUPTS 1024
+
+typedef struct {
+  uint32_t priority_threshold;
+  uint32_t claim_complete;
+  uint32_t reserved_8[1022];
+} RISCV_PLIC_hart_regs;
+
+typedef struct {
+  uint32_t priority[RISCV_PLIC_MAX_INTERRUPTS];
+  uint32_t pending[1024];
+  uint32_t enable[16320][32];
+  RISCV_PLIC_hart_regs harts[CPU_MAXIMUM_PROCESSORS];
+} RISCV_PLIC_regs;
+
+typedef struct {
+#ifdef __riscv_atomic
   uint64_t clear_reservations;
   uint32_t reserved_for_alignment_of_interrupt_frame[ 2 ];
-} CPU_Per_CPU_control;
 #endif
+  volatile RISCV_PLIC_hart_regs *plic_hart_regs;
+  volatile uint32_t *plic_m_ie;
+  volatile RISCV_CLINT_timer_reg *clint_mtimecmp;
+  volatile uint32_t *clint_msip;
+} CPU_Per_CPU_control;
 
 struct Per_CPU_Control;