plat_sip_calls.c

/*
 * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
 * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <arch.h>
#include <arch_helpers.h>
#include <assert.h>
#include <common/bl_common.h>
#include <common/debug.h>
#include <common/runtime_svc.h>
#include <errno.h>
#include <lib/mmio.h>
#include <lib/utils_def.h>

#include <memctrl.h>
#include <pmc.h>
#include <tegra_private.h>
#include <tegra_platform.h>
#include <tegra_def.h>

/*******************************************************************************
 * PMC parameters
 ******************************************************************************/
#define PMC_READ 			U(0xaa)
#define PMC_WRITE 			U(0xbb)

/*******************************************************************************
 * Tegra210 SiP SMCs
 ******************************************************************************/
#define TEGRA_SIP_PMC_COMMANDS		U(0xC2FFFE00)

/*******************************************************************************
 * This function is responsible for handling all T210 SiP calls
 ******************************************************************************/
int plat_sip_handler(uint32_t smc_fid,
		     uint64_t x1,
		     uint64_t x2,
		     uint64_t x3,
		     uint64_t x4,
		     const void *cookie,
		     void *handle,
		     uint64_t flags)
{
	uint32_t val, ns;

	/* Determine which security state this SMC originated from */
	ns = is_caller_non_secure(flags);
	if (!ns)
		SMC_RET1(handle, SMC_UNK);

	if (smc_fid == TEGRA_SIP_PMC_COMMANDS) {
		/* check the address is within PMC range and is 4byte aligned */
		if ((x2 >= TEGRA_PMC_SIZE) || (x2 & 0x3))
			return -EINVAL;

		switch (x2) {
		/* Black listed PMC registers */
		case PMC_SCRATCH1:
		case PMC_SCRATCH31 ... PMC_SCRATCH33:
		case PMC_SCRATCH40:
		case PMC_SCRATCH42:
		case PMC_SCRATCH43 ... PMC_SCRATCH48:
		case PMC_SCRATCH50 ... PMC_SCRATCH51:
		case PMC_SCRATCH56 ... PMC_SCRATCH57:
		/* PMC secure-only registers are not accessible */
		case PMC_DPD_ENABLE_0:
		case PMC_FUSE_CONTROL_0:
		case PMC_CRYPTO_OP_0:
		case PMC_TSC_MULT_0:
		case PMC_STICKY_BIT:
			ERROR("%s: error offset=0x%llx\n", __func__, x2);
			return -EFAULT;
		default:
			/* Valid register */
			break;
		}

		/* Perform PMC read/write */
		if (x1 == PMC_READ) {
			val = mmio_read_32((uint32_t)(TEGRA_PMC_BASE + x2));
			write_ctx_reg(get_gpregs_ctx(handle), CTX_GPREG_X1, val);
		} else if (x1 == PMC_WRITE) {
			mmio_write_32((uint32_t)(TEGRA_PMC_BASE + x2), (uint32_t)x3);
		} else {
			return -EINVAL;
		}
	} else {
		ERROR("%s: unsupported function ID\n", __func__);
		return -ENOTSUP;
	}
	return 0;
}