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/*
* Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch.h>
#include <assert.h>
#include <cci.h>
#include <debug.h>
#include <mmio.h>
#include <stdint.h>
static uintptr_t g_cci_base;
static unsigned int g_max_master_id;
static const int *g_cci_slave_if_map;
#if ENABLE_ASSERTIONS
static int validate_cci_map(const int *map)
{
unsigned int valid_cci_map = 0;
int slave_if_id;
int i;
/* Validate the map */
for (i = 0; i <= g_max_master_id; i++) {
slave_if_id = map[i];
if (slave_if_id < 0)
continue;
if (slave_if_id >= CCI_SLAVE_INTERFACE_COUNT) {
ERROR("Slave interface ID is invalid\n");
return 0;
}
if (valid_cci_map & (1 << slave_if_id)) {
ERROR("Multiple masters are assigned same slave interface ID\n");
return 0;
}
valid_cci_map |= 1 << slave_if_id;
}
if (!valid_cci_map) {
ERROR("No master is assigned a valid slave interface\n");
return 0;
}
return 1;
}
#endif /* ENABLE_ASSERTIONS */
void cci_init(uintptr_t cci_base,
const int *map,
unsigned int num_cci_masters)
{
assert(map);
assert(cci_base);
g_cci_base = cci_base;
/*
* Master Id's are assigned from zero, So in an array of size n
* the max master id is (n - 1).
*/
g_max_master_id = num_cci_masters - 1;
assert(validate_cci_map(map));
g_cci_slave_if_map = map;
}
void cci_enable_snoop_dvm_reqs(unsigned int master_id)
{
int slave_if_id;
assert(g_cci_base);
assert(master_id <= g_max_master_id);
slave_if_id = g_cci_slave_if_map[master_id];
assert((slave_if_id < CCI_SLAVE_INTERFACE_COUNT) && (slave_if_id >= 0));
/*
* Enable Snoops and DVM messages, no need for Read/Modify/Write as
* rest of bits are write ignore
*/
mmio_write_32(g_cci_base +
SLAVE_IFACE_OFFSET(slave_if_id) +
SNOOP_CTRL_REG, DVM_EN_BIT | SNOOP_EN_BIT);
/* Wait for the dust to settle down */
while (mmio_read_32(g_cci_base + STATUS_REG) & CHANGE_PENDING_BIT)
;
}
void cci_disable_snoop_dvm_reqs(unsigned int master_id)
{
int slave_if_id;
assert(g_cci_base);
assert(master_id <= g_max_master_id);
slave_if_id = g_cci_slave_if_map[master_id];
assert((slave_if_id < CCI_SLAVE_INTERFACE_COUNT) && (slave_if_id >= 0));
/*
* Disable Snoops and DVM messages, no need for Read/Modify/Write as
* rest of bits are write ignore.
*/
mmio_write_32(g_cci_base +
SLAVE_IFACE_OFFSET(slave_if_id) +
SNOOP_CTRL_REG, ~(DVM_EN_BIT | SNOOP_EN_BIT));
/* Wait for the dust to settle down */
while (mmio_read_32(g_cci_base + STATUS_REG) & CHANGE_PENDING_BIT)
;
}
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