From abbf5a2ef4b46218a1b24ef6afd6cf7b35a87e55 Mon Sep 17 00:00:00 2001
From: Drew Barbier <dbarbi1@gmail.com>
Date: Mon, 2 Jul 2018 00:40:06 -0500
Subject: e2 and clic start

---
 bsp/drivers/clic/clic_driver.c | 90 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 bsp/drivers/clic/clic_driver.c

(limited to 'bsp/drivers/clic/clic_driver.c')

diff --git a/bsp/drivers/clic/clic_driver.c b/bsp/drivers/clic/clic_driver.c
new file mode 100644
index 0000000..8acf4d2
--- /dev/null
+++ b/bsp/drivers/clic/clic_driver.c
@@ -0,0 +1,90 @@
+// See LICENSE for license details.
+
+#include "sifive/devices/clic.h"
+#include "clic/clic_driver.h"
+#include "platform.h"
+#include "encoding.h"
+#include <string.h>
+
+
+void volatile_memzero(uint8_t * base, unsigned int size) {
+  volatile uint8_t * ptr;
+  for (ptr = base; ptr < (base + size); ptr++){
+    *ptr = 0;
+  }
+}
+
+// Note that there are no assertions or bounds checking on these
+// parameter values.
+void clic_init (
+                clic_instance_t * this_clic,
+                uintptr_t hart_addr,
+                interrupt_function_ptr_t* vect_table,
+                interrupt_function_ptr_t default_handler,
+                uint32_t num_irq,
+                uint32_t num_config_bits
+                )
+{
+  this_clic->hart_addr=  hart_addr;
+  this_clic->vect_table= vect_table;
+  this_clic->num_config_bits= num_config_bits;
+
+  //initialize vector table
+  for(int i=0;i++;i<num_irq)  {
+    this_clic->vect_table[i] = default_handler;
+  }
+
+  //set base vectors
+  write_csr(mtvt, vect_table);
+
+
+  //clear all interrupt enables and pending
+  volatile_memzero((uint8_t*)(this_clic->hart_addr+CLIC_INTIE), num_irq);
+  volatile_memzero((uint8_t*)(this_clic->hart_addr+CLIC_INTIP), num_irq);
+
+  //clear nlbits and nvbits; all interrupts trap to level 15
+  *(volatile uint8_t*)(this_clic->hart_addr+CLIC_CFG)=0;
+
+}
+
+void clic_install_handler (clic_instance_t * this_clic, uint32_t source, interrupt_function_ptr_t handler) {
+    this_clic->vect_table[source] = handler;
+}
+
+void clic_enable_interrupt (clic_instance_t * this_clic, uint32_t source) {
+    *(volatile uint8_t*)(this_clic->hart_addr+CLIC_INTIE+source) = 1;
+}
+
+void clic_disable_interrupt (clic_instance_t * this_clic, uint32_t source){
+  *(volatile uint8_t*)(this_clic->hart_addr+CLIC_INTIE+source) = 0;
+}
+
+void clic_set_pending(clic_instance_t * this_clic, uint32_t source){
+  *(volatile uint8_t*)(this_clic->hart_addr+CLIC_INTIP+source) = 1;
+}
+
+void clic_clear_pending(clic_instance_t * this_clic, uint32_t source){
+  *(volatile uint8_t*)(this_clic->hart_addr+CLIC_INTIP+source) = 0;
+}
+
+//should return max level set. if level set doesn't match requested, check nlbits
+void clic_set_level (clic_instance_t * this_clic, uint32_t source, uint32_t level){
+  
+}
+
+void clic_get_level (clic_instance_t * this_clic, uint32_t source, uint32_t level){
+
+}
+
+void clic_set_priority (clic_instance_t * this_clic, uint32_t source, uint32_t priority){
+
+}
+
+void clic_get_priority (clic_instance_t * this_clic, uint32_t source, uint32_t priority){
+
+
+}
+
+
+
+
-- 
cgit v1.2.1-18-gbd029