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/* Copyright 2018 SiFive, Inc */
/* SPDX-License-Identifier: Apache-2.0 */
#include <metal/machine/platform.h>
#ifdef METAL_SIFIVE_FU540_C000_L2
#include <stdint.h>
#include <metal/io.h>
#include <metal/drivers/sifive_fu540-c000_l2.h>
#include <metal/machine.h>
#define L2_CONFIG_WAYS_SHIFT 8
#define L2_CONFIG_WAYS_MASK (0xFF << L2_CONFIG_WAYS_SHIFT)
void __metal_driver_sifive_fu540_c000_l2_init(struct metal_cache *l2, int ways);
static void metal_driver_sifive_fu540_c000_l2_init(void) __attribute__((constructor));
static void metal_driver_sifive_fu540_c000_l2_init(void)
{
#ifdef __METAL_DT_SIFIVE_FU540_C000_L2_HANDLE
/* Get the handle for the L2 cache controller */
struct metal_cache *l2 = __METAL_DT_SIFIVE_FU540_C000_L2_HANDLE;
if(!l2) {
return;
}
/* Get the number of available ways per bank */
unsigned long control_base = __metal_driver_sifive_fu540_c000_l2_control_base(l2);
uint32_t ways = __METAL_ACCESS_ONCE((__metal_io_u32 *)(control_base + METAL_SIFIVE_FU540_C000_L2_CONFIG));
ways = ((ways & L2_CONFIG_WAYS_MASK) >> L2_CONFIG_WAYS_SHIFT);
/* Enable all the ways */
__metal_driver_sifive_fu540_c000_l2_init(l2, ways);
#endif
}
void __metal_driver_sifive_fu540_c000_l2_init(struct metal_cache *l2, int ways)
{
metal_cache_set_enabled_ways(l2, ways);
}
int __metal_driver_sifive_fu540_c000_l2_get_enabled_ways(struct metal_cache *cache)
{
unsigned long control_base = __metal_driver_sifive_fu540_c000_l2_control_base(cache);
uint32_t way_enable = __METAL_ACCESS_ONCE((__metal_io_u32 *)(control_base + METAL_SIFIVE_FU540_C000_L2_WAYENABLE));
/* The stored number is the index, so add one */
return (0xFF & way_enable) + 1;
}
int __metal_driver_sifive_fu540_c000_l2_set_enabled_ways(struct metal_cache *cache, int ways)
{
unsigned long control_base = __metal_driver_sifive_fu540_c000_l2_control_base(cache);
/* We can't decrease the number of enabled ways */
if(metal_cache_get_enabled_ways(cache) > ways) {
return -2;
}
/* The stored value is the index, so subtract one */
uint32_t value = 0xFF & (ways - 1);
/* Set the number of enabled ways */
__METAL_ACCESS_ONCE((__metal_io_u32 *)(control_base + METAL_SIFIVE_FU540_C000_L2_WAYENABLE)) = value;
/* Make sure the number of ways was set correctly */
if(metal_cache_get_enabled_ways(cache) != ways) {
return -3;
}
return 0;
}
__METAL_DEFINE_VTABLE(__metal_driver_vtable_sifive_fu540_c000_l2) = {
.cache.init = __metal_driver_sifive_fu540_c000_l2_init,
.cache.get_enabled_ways = __metal_driver_sifive_fu540_c000_l2_get_enabled_ways,
.cache.set_enabled_ways = __metal_driver_sifive_fu540_c000_l2_set_enabled_ways,
};
#endif
typedef int no_empty_translation_units;
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