/*
* Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <debug.h>
#include <mmio.h>
#include <tzc_dmc500.h>
#include "tzc_common.h"
#include "tzc_common_private.h"
/*
* Macros which will be used by common core functions.
*/
#define TZC_DMC500_REGION_BASE_LOW_0_OFFSET 0x054
#define TZC_DMC500_REGION_BASE_HIGH_0_OFFSET 0x058
#define TZC_DMC500_REGION_TOP_LOW_0_OFFSET 0x05C
#define TZC_DMC500_REGION_TOP_HIGH_0_OFFSET 0x060
#define TZC_DMC500_REGION_ATTR_0_OFFSET 0x064
#define TZC_DMC500_REGION_ID_ACCESS_0_OFFSET 0x068
#define TZC_DMC500_ACTION_OFF 0x50
/* Pointer to the tzc_dmc500_driver_data structure populated by the platform */
static const tzc_dmc500_driver_data_t *g_driver_data;
#define verify_region_attr(region, attr) \
((g_conf_regions[(region)].sec_attr == \
((attr) >> TZC_REGION_ATTR_SEC_SHIFT)) \
&& ((attr) & (0x1 << TZC_REGION_ATTR_F_EN_SHIFT)))
/*
* Structure for configured regions attributes in DMC500.
*/
typedef struct tzc_dmc500_regions {
tzc_region_attributes_t sec_attr;
int is_enabled;
} tzc_dmc500_regions_t;
/*
* Array storing the attributes of the configured regions. This array
* will be used by the `tzc_dmc500_verify_complete` to verify the flush
* completion.
*/
static tzc_dmc500_regions_t g_conf_regions[MAX_REGION_VAL + 1];
/* Helper Macros for making the code readable */
#define DMC_INST_BASE_ADDR(instance) (g_driver_data->dmc_base[instance])
#define DMC_INST_SI_BASE(instance, interface) \
(DMC_INST_BASE_ADDR(instance) + IFACE_OFFSET(interface))
DEFINE_TZC_COMMON_WRITE_ACTION(_dmc500, DMC500)
DEFINE_TZC_COMMON_WRITE_REGION_BASE(_dmc500, DMC500)
DEFINE_TZC_COMMON_WRITE_REGION_TOP(_dmc500, DMC500)
DEFINE_TZC_COMMON_WRITE_REGION_ATTRIBUTES(_dmc500, DMC500)
DEFINE_TZC_COMMON_WRITE_REGION_ID_ACCESS(_dmc500, DMC500)
DEFINE_TZC_COMMON_CONFIGURE_REGION0(_dmc500)
DEFINE_TZC_COMMON_CONFIGURE_REGION(_dmc500)
static inline unsigned int _tzc_dmc500_read_region_attr_0(
uintptr_t dmc_si_base,
int region_no)
{
return mmio_read_32(dmc_si_base +
TZC_REGION_OFFSET(TZC_DMC500_REGION_SIZE, region_no) +
TZC_DMC500_REGION_ATTR_0_OFFSET);
}
static inline void _tzc_dmc500_write_flush_control(uintptr_t dmc_si_base)
{
mmio_write_32(dmc_si_base + SI_FLUSH_CTRL_OFFSET, 1);
}
/*
* Sets the Flush controls for all the DMC Instances and System Interfaces.
* This initiates the flush of configuration settings from the shadow
* registers to the actual configuration register. The caller should poll
* changed register to confirm update.
*/
void tzc_dmc500_config_complete(void)
{
int dmc_inst, sys_if;
assert(g_driver_data);
for (dmc_inst = 0; dmc_inst < g_driver_data->dmc_count; dmc_inst++) {
assert(DMC_INST_BASE_ADDR(dmc_inst));
for (sys_if = 0; sys_if < MAX_SYS_IF_COUNT; sys_if++)
_tzc_dmc500_write_flush_control(
DMC_INST_SI_BASE(dmc_inst, sys_if));
}
}
/*
* This function reads back the secure attributes from the configuration
* register for each DMC Instance and System Interface and compares it with
* the configured value. The successful verification of the region attributes
* confirms that the flush operation has completed.
* If the verification fails, the caller is expected to invoke this API again
* till it succeeds.
* Returns 0 on success and 1 on failure.
*/
int tzc_dmc500_verify_complete(void)
{
int dmc_inst, sys_if, region_no;
unsigned int attr;
assert(g_driver_data);
/* Region 0 must be configured */
assert(g_conf_regions[0].is_enabled);
/* Iterate over all configured regions */
for (region_no = 0; region_no <= MAX_REGION_VAL; region_no++) {
if (!g_conf_regions[region_no].is_enabled)
continue;
for (dmc_inst = 0; dmc_inst < g_driver_data->dmc_count;
dmc_inst++) {
assert(DMC_INST_BASE_ADDR(dmc_inst));
for (sys_if = 0; sys_if < MAX_SYS_IF_COUNT;
sys_if++) {
attr = _tzc_dmc500_read_region_attr_0(
DMC_INST_SI_BASE(dmc_inst, sys_if),
region_no);
VERBOSE("Verifying DMC500 region:%d"
" dmc_inst:%d sys_if:%d attr:%x\n",
region_no, dmc_inst, sys_if, attr);
if (!verify_region_attr(region_no, attr))
return 1;
}
}
}
return 0;
}
/*
* `tzc_dmc500_configure_region0` is used to program region 0 in both the
* system interfaces of all the DMC-500 instances. Region 0 covers the whole
* address space that is not mapped to any other region for a system interface,
* and is always enabled; this cannot be changed. This function only changes
* the access permissions.
*/
void tzc_dmc500_configure_region0(tzc_region_attributes_t sec_attr,
unsigned int nsaid_permissions)
{
int dmc_inst, sys_if;
/* Assert if DMC-500 is not initialized */
assert(g_driver_data);
/* Configure region_0 in all DMC instances */
for (dmc_inst = 0; dmc_inst < g_driver_data->dmc_count; dmc_inst++) {
assert(DMC_INST_BASE_ADDR(dmc_inst));
for (sys_if = 0; sys_if < MAX_SYS_IF_COUNT; sys_if++)
_tzc_dmc500_configure_region0(
DMC_INST_SI_BASE(dmc_inst, sys_if),
sec_attr, nsaid_permissions);
}
g_conf_regions[0].sec_attr = sec_attr;
g_conf_regions[0].is_enabled = 1;
}
/*
* `tzc_dmc500_configure_region` is used to program a region into all system
* interfaces of all the DMC instances.
* NOTE:
* Region 0 is special; it is preferable to use tzc_dmc500_configure_region0
* for this region (see comment for that function).
*/
void tzc_dmc500_configure_region(int region_no,
unsigned long long region_base,
unsigned long long region_top,
tzc_region_attributes_t sec_attr,
unsigned int nsaid_permissions)
{
int dmc_inst, sys_if;
assert(g_driver_data);
/* Do range checks on regions. */
assert(region_no >= 0 && region_no <= MAX_REGION_VAL);
/*
* Do address range check based on DMC-TZ configuration. A 43bit address
* is the max and expected case.
*/
assert(((region_top <= _tzc_get_max_top_addr(43)) &&
(region_base < region_top)));
/* region_base and (region_top + 1) must be 4KB aligned */
assert(((region_base | (region_top + 1)) & (4096 - 1)) == 0);
for (dmc_inst = 0; dmc_inst < g_driver_data->dmc_count; dmc_inst++) {
assert(DMC_INST_BASE_ADDR(dmc_inst));
for (sys_if = 0; sys_if < MAX_SYS_IF_COUNT; sys_if++)
_tzc_dmc500_configure_region(
DMC_INST_SI_BASE(dmc_inst, sys_if),
TZC_DMC500_REGION_ATTR_F_EN_MASK,
region_no, region_base, region_top,
sec_attr, nsaid_permissions);
}
g_conf_regions[region_no].sec_attr = sec_attr;
g_conf_regions[region_no].is_enabled = 1;
}
/* Sets the action value for all the DMC instances */
void tzc_dmc500_set_action(tzc_action_t action)
{
int dmc_inst;
assert(g_driver_data);
for (dmc_inst = 0; dmc_inst < g_driver_data->dmc_count; dmc_inst++) {
assert(DMC_INST_BASE_ADDR(dmc_inst));
/*
* - Currently no handler is provided to trap an error via
* interrupt or exception.
* - The interrupt action has not been tested.
*/
_tzc_dmc500_write_action(DMC_INST_BASE_ADDR(dmc_inst), action);
}
}
/*
* A DMC-500 instance must be present at each base address provided by the
* platform. It also expects platform to pass at least one instance of
* DMC-500.
*/
static void validate_plat_driver_data(
const tzc_dmc500_driver_data_t *plat_driver_data)
{
#if ENABLE_ASSERTIONS
int i;
unsigned int dmc_id;
uintptr_t dmc_base;
assert(plat_driver_data);
assert(plat_driver_data->dmc_count > 0 &&
(plat_driver_data->dmc_count <= MAX_DMC_COUNT));
for (i = 0; i < plat_driver_data->dmc_count; i++) {
dmc_base = plat_driver_data->dmc_base[i];
assert(dmc_base);
dmc_id = _tzc_read_peripheral_id(dmc_base);
assert(dmc_id == DMC500_PERIPHERAL_ID);
}
#endif /* ENABLE_ASSERTIONS */
}
/*
* Initializes the base address and count of DMC instances.
*
* Note : Only pointer to plat_driver_data is saved, so it is caller's
* responsibility to keep it valid until the driver is used.
*/
void tzc_dmc500_driver_init(const tzc_dmc500_driver_data_t *plat_driver_data)
{
/* Check valid pointer is passed */
assert(plat_driver_data);
/*
* NOTE: This driver expects the DMC-500 controller is already in
* READY state. Hence, it uses the reconfiguration method for
* programming TrustZone regions
*/
/* Validates the information passed by platform */
validate_plat_driver_data(plat_driver_data);
g_driver_data = plat_driver_data;
}