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/** @file
*
* Copyright (c) 2011, ARM Limited. All rights reserved.
*
* This program and the accompanying materials
* are licensed and made available under the terms and conditions of the BSD License
* which accompanies this distribution. The full text of the license may be found at
* http://opensource.org/licenses/bsd-license.php
*
* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
*
**/
#include <Library/IoLib.h>
#include <Library/DebugLib.h>
#include <Library/ArmLib.h>
#include <Library/L2X0CacheLib.h>
#include <Library/PcdLib.h>
#define L2x0WriteReg(reg,val) MmioWrite32(PcdGet32(PcdL2x0ControllerBase) + reg, val)
#define L2x0ReadReg(reg) MmioRead32(PcdGet32(PcdL2x0ControllerBase) + reg)
// Initialize PL320 L2 Cache Controller
VOID L2x0CacheInit(UINTN L2x0Base, BOOLEAN CacheEnabled) {
UINT32 Data;
UINT32 Revision;
UINT32 Aux;
UINT32 PfCtl;
UINT32 PwrCtl;
// Check if L2x0 is present and is an ARM implementation
Data = L2x0ReadReg(L2X0_CACHEID);
if ((Data >> 24) != L2X0_CACHEID_IMPLEMENTER_ARM) {
ASSERT(0);
return;
}
// Check if L2x0 is PL310
if (((Data >> 6) & 0xF) != L2X0_CACHEID_PARTNUM_PL310) {
ASSERT(0);
return;
}
// RTL release
Revision = Data & 0x3F;
// Check if L2x0 is already enabled then we disable it
Data = L2x0ReadReg(L2X0_CTRL);
if (Data & L2X0_CTRL_ENABLED) {
L2x0WriteReg(L2X0_CTRL, L2X0_CTRL_DISABLED);
}
//
// Set up global configurations
//
// Auxiliary register: Non-secure interrupt access Control + Event monitor bus enable + SBO
Aux = L2X0_AUXCTRL_NSAC | L2X0_AUXCTRL_EM | L2X0_AUXCTRL_SBO;
// Use AWCACHE attributes for WA
Aux |= L2x0_AUXCTRL_AW_AWCACHE;
// Use default Size
Data = L2x0ReadReg(L2X0_AUXCTRL);
Aux |= Data & (0x7 << 17);
// Use default associativity
Aux |= Data & (0x1 << 16);
// Enabled I & D Prefetch
Aux |= L2x0_AUXCTRL_IPREFETCH | L2x0_AUXCTRL_DPREFETCH;
if (Revision >= 5) {
// Prefetch Offset Register
PfCtl = L2x0ReadReg(L2X0_PFCTRL);
// - Prefetch increment set to 0
// - Prefetch dropping off
// - Double linefills off
L2x0WriteReg(L2X0_PFCTRL, PfCtl);
// Power Control Register - L2X0_PWRCTRL
PwrCtl = L2x0ReadReg(L2X0_PWRCTRL);
// - Standby when idle off
// - Dynamic clock gating off
// - Nc,NC-shared dropping off
L2x0WriteReg(L2X0_PWRCTRL, PwrCtl);
}
if (Revision >= 4) {
// Tag RAM Latency register
// - Use default latency
// Data RAM Latency Control register
// - Use default latency
} else if (Revision >= 2) {
L2x0WriteReg(L230_TAG_LATENCY,
(L2_TAG_ACCESS_LATENCY << 8)
| (L2_TAG_ACCESS_LATENCY << 4)
| L2_TAG_SETUP_LATENCY
);
L2x0WriteReg(L230_DATA_LATENCY,
(L2_DATA_ACCESS_LATENCY << 8)
| (L2_DATA_ACCESS_LATENCY << 4)
| L2_DATA_SETUP_LATENCY
);
} else {
Aux |= (L2_TAG_ACCESS_LATENCY << 6)
| (L2_DATA_ACCESS_LATENCY << 3)
| L2_DATA_ACCESS_LATENCY;
}
// Write Auxiliary value
L2x0WriteReg(L2X0_AUXCTRL, Aux);
//
// Invalidate all entries in cache
//
L2x0WriteReg(L2X0_INVWAY, 0xffff);
// Poll cache maintenance register until invalidate operation is complete
while(L2x0ReadReg(L2X0_INVWAY) & 0xffff);
// Write to the Lockdown D and Lockdown I Register 9 if required
// - Not required
// Clear any residual raw interrupts
L2x0WriteReg(L2X0_INTCLEAR, 0x1FF);
// Enable the cache
if (CacheEnabled) {
L2x0WriteReg(L2X0_CTRL, L2X0_CTRL_ENABLED);
}
}
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