L2 Cache Controller Driver

Overview

L2 Cache Controller (L2CTRL) driver.

This module provides functions to configure and control L2CTRL input/output and interrupt behavior.

Usage & Initialization.

This example shows how to flush L2 Cache using Blocking Method .

#include "l2ctrl/l2ctrl.h"
void main()
{
    char buf[40];
    u64 val;
    u64 *dat = (u64 *)SYSTEM_AXI_B_CTRL;
 
    // Write 4KB data to axiB block ram
    for(int i=0; i < (4096/sizeof(uintptr_t)); i=i+1) {
        *dat = (0x0101010101010101*i);
        dat++;
    }
    dat--;
    // Read 4KB data from axiB block ram
    for(int i=0; i < (4096/sizeof(uintptr_t)); i=i+1) {
        val=*dat;
        dat--;
    }
    // Data is now only available in L2 cache
    // Flush the data to axiB block ram using blocking method
    l2cache_flushBlocking(dat, 4096);
    printf("Flush done ..\n");
}

This example shows how to flush L2 Cache using Interrupt Method .

#include "l2ctrl/l2ctrl.h"
#include "irq.h"
 
// Interrupt handler for L2 Cache Flush completion
int irq_m_l2Cache_handler (){
    printf("isr: Flush done ..\n");
    l2cache_setFlushInterrupt(0x0U);
    asm("fence");
    return 0;
}
 
 
void l2_isr_init() {
    plic_instance_t l2_plic = {
        .target     = BSP_PLIC_CPU_0,
        .gateway    = SYSTEM_L2_CACHE_CTRL_INTERRUPT,
        .priority   = 0x1U,
        .enable     = 0X1U,
        .threshold  = 0x0U,
    };
 
    plic_applyConfig(&l2_plic);
    irq_setTrapVector(trap_entry);
    irq_setType(IRQ_EXTERNAL);
    irq_enable();
 
}
 
void main()
{
    char buf[40];
    u64 val;
    u64 *dat = (u64 *)SYSTEM_AXI_B_CTRL;
 
 dat++;
 // Write another 4KB data to axiB block ram
 for(int i=0; i < (4096/sizeof(uintptr_t)); i=i+1) {
    *dat = (0x1010101010101010*i);
    dat++;
 }
 dat--;
 // Read 4KB data from axiB block ram
 for(int i=0; i < (4096/sizeof(uintptr_t)); i=i+1) {
    val=*dat;
    dat--;
 }
 dat++;
 // Flush the data to axiB block ram using nonblocking method and interrupt
 l2cache_flush(dat, 4096);
 l2cache_setFlushInterrupt(0x1U);
 while(1){};
}

See also

Example AXI-B Demo with L2 Cache - Learn how to use the driver with AXI-B Interface

Topics
	API Functions
	Function definitions for L2CTRL driver.
	Data Structures
	Structs and Enums used by the driver.