plat/xilinx/zynqmp/aarch64/zynqmp_common.c - filogic/atf - Gitiles

 /*
  * Copyright (c) 2013-2022, Arm Limited and Contributors. All rights reserved.
  * Copyright (c) 2022-2023, Advanced Micro Devices, Inc. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */

 #include <stdbool.h>
 #include <string.h>

 #include <common/debug.h>
 #include <drivers/generic_delay_timer.h>
 #include <lib/mmio.h>
 #include <lib/smccc.h>
 #include <lib/xlat_tables/xlat_tables.h>
 #include <plat/common/platform.h>
 #include <services/arm_arch_svc.h>

 #include <plat_ipi.h>
 #include <plat_private.h>
 #include <plat_startup.h>

 #include "zynqmp_pm_api_sys.h"

 /*
  * Table of regions to map using the MMU.
  * This doesn't include TZRAM as the 'mem_layout' argument passed to
  * configure_mmu_elx() will give the available subset of that,
  */
 const mmap_region_t plat_zynqmp_mmap[] = {
 	{ DEVICE0_BASE, DEVICE0_BASE, DEVICE0_SIZE, MT_DEVICE | MT_RW | MT_SECURE },
 	{ DEVICE1_BASE, DEVICE1_BASE, DEVICE1_SIZE, MT_DEVICE | MT_RW | MT_SECURE },
 	{ CRF_APB_BASE, CRF_APB_BASE, CRF_APB_SIZE, MT_DEVICE | MT_RW | MT_SECURE },
 	{0}
 };

 const mmap_region_t *plat_get_mmap(void)
 {
 	return plat_zynqmp_mmap;
 }

 static uint32_t zynqmp_get_silicon_ver(void)
 {
 	static unsigned int ver;

 	if (!ver) {
 		ver = mmio_read_32(ZYNQMP_CSU_BASEADDR +
 				   ZYNQMP_CSU_VERSION_OFFSET);
 		ver &= ZYNQMP_SILICON_VER_MASK;
 		ver >>= ZYNQMP_SILICON_VER_SHIFT;
 	}

 	return ver;
 }

 uint32_t get_uart_clk(void)
 {
 	unsigned int ver = zynqmp_get_silicon_ver();

 	if (ver == ZYNQMP_CSU_VERSION_QEMU) {
 		return 133000000;
 	} else {
 		return 100000000;
 	}
 }

 #if LOG_LEVEL >= LOG_LEVEL_NOTICE
 static const struct {
 	uint8_t id;
 	bool evexists;
 	uint16_t ver;
 	char *name;
 } __packed zynqmp_devices[] = {
 	{
 		.id = 0x10,
 		.name = "XCZU3EG",
 	},
 	{
 		.id = 0x10,
 		.ver = 0x2c,
 		.name = "XCZU3CG",
 	},
 	{
 		.id = 0x11,
 		.name = "XCZU2EG",
 	},
 	{
 		.id = 0x11,
 		.ver = 0x2c,
 		.name = "XCZU2CG",
 	},
 	{
 		.id = 0x20,
 		.name = "XCZU5EV",
 		.evexists = true,
 	},
 	{
 		.id = 0x20,
 		.ver = 0x100,
 		.name = "XCZU5EG",
 		.evexists = true,
 	},
 	{
 		.id = 0x20,
 		.ver = 0x12c,
 		.name = "XCZU5CG",
 	},
 	{
 		.id = 0x21,
 		.name = "XCZU4EV",
 		.evexists = true,
 	},
 	{
 		.id = 0x21,
 		.ver = 0x100,
 		.name = "XCZU4EG",
 		.evexists = true,
 	},
 	{
 		.id = 0x21,
 		.ver = 0x12c,
 		.name = "XCZU4CG",
 	},
 	{
 		.id = 0x30,
 		.name = "XCZU7EV",
 		.evexists = true,
 	},
 	{
 		.id = 0x30,
 		.ver = 0x100,
 		.name = "XCZU7EG",
 		.evexists = true,
 	},
 	{
 		.id = 0x30,
 		.ver = 0x12c,
 		.name = "XCZU7CG",
 	},
 	{
 		.id = 0x38,
 		.name = "XCZU9EG",
 	},
 	{
 		.id = 0x38,
 		.ver = 0x2c,
 		.name = "XCZU9CG",
 	},
 	{
 		.id = 0x39,
 		.name = "XCZU6EG",
 	},
 	{
 		.id = 0x39,
 		.ver = 0x2c,
 		.name = "XCZU6CG",
 	},
 	{
 		.id = 0x40,
 		.name = "XCZU11EG",
 	},
 	{
 		.id = 0x50,
 		.name = "XCZU15EG",
 	},
 	{
 		.id = 0x58,
 		.name = "XCZU19EG",
 	},
 	{
 		.id = 0x59,
 		.name = "XCZU17EG",
 	},
 	{
 		.id = 0x60,
 		.name = "XCZU28DR",
 	},
 	{
 		.id = 0x61,
 		.name = "XCZU21DR",
 	},
 	{
 		.id = 0x62,
 		.name = "XCZU29DR",
 	},
 	{
 		.id = 0x63,
 		.name = "XCZU23DR",
 	},
 	{
 		.id = 0x64,
 		.name = "XCZU27DR",
 	},
 	{
 		.id = 0x65,
 		.name = "XCZU25DR",
 	},
 	{
 		.id = 0x66,
 		.name = "XCZU39DR",
 	},
 	{
 		.id = 0x7d,
 		.name = "XCZU43DR",
 	},
 	{
 		.id = 0x78,
 		.name = "XCZU46DR",
 	},
 	{
 		.id = 0x7f,
 		.name = "XCZU47DR",
 	},
 	{
 		.id = 0x7b,
 		.name = "XCZU48DR",
 	},
 	{
 		.id = 0x7e,
 		.name = "XCZU49DR",
 	},
 };

 #define ZYNQMP_PL_STATUS_BIT	9
 #define ZYNQMP_PL_STATUS_MASK	BIT(ZYNQMP_PL_STATUS_BIT)
 #define ZYNQMP_CSU_VERSION_MASK	~(ZYNQMP_PL_STATUS_MASK)

 #define SILICON_ID_XCK24	0x4712093U
 #define SILICON_ID_XCK26	0x4724093U

 static char *zynqmp_get_silicon_idcode_name(void)
 {
 	uint32_t id, ver, chipid[2];
 	size_t i, j, len;
 	const char *name = "EG/EV";

 	if (pm_get_chipid(chipid) != PM_RET_SUCCESS) {
 		return "XCZUUNKN";
 	}

 	id = chipid[0] & (ZYNQMP_CSU_IDCODE_DEVICE_CODE_MASK |
 			  ZYNQMP_CSU_IDCODE_SVD_MASK);
 	id >>= ZYNQMP_CSU_IDCODE_SVD_SHIFT;
 	ver = chipid[1] >> ZYNQMP_EFUSE_IPDISABLE_SHIFT;

 	for (i = 0; i < ARRAY_SIZE(zynqmp_devices); i++) {
 		if (zynqmp_devices[i].id == id &&
 		    zynqmp_devices[i].ver == (ver & ZYNQMP_CSU_VERSION_MASK)) {
 			break;
 		}
 	}

 	if (i >= ARRAY_SIZE(zynqmp_devices)) {
 		switch (chipid[0]) {
 		case SILICON_ID_XCK24:
 			return "XCK24";
 		case SILICON_ID_XCK26:
 			return "XCK26";
 		default:
 			return "XCZUUNKN";
 		}
 	}

 	if (!zynqmp_devices[i].evexists) {
 		return zynqmp_devices[i].name;
 	}

 	if ((ver & ZYNQMP_PL_STATUS_MASK) != 0U) {
 		return zynqmp_devices[i].name;
 	}

 	len = strlen(zynqmp_devices[i].name) - 2;
 	for (j = 0; j < strlen(name); j++) {
 		zynqmp_devices[i].name[len] = name[j];
 		len++;
 	}
 	zynqmp_devices[i].name[len] = '\0';

 	return zynqmp_devices[i].name;
 }

 static unsigned int zynqmp_get_rtl_ver(void)
 {
 	uint32_t ver;

 	ver = mmio_read_32(ZYNQMP_CSU_BASEADDR + ZYNQMP_CSU_VERSION_OFFSET);
 	ver &= ZYNQMP_RTL_VER_MASK;
 	ver >>= ZYNQMP_RTL_VER_SHIFT;

 	return ver;
 }

 static char *zynqmp_print_silicon_idcode(void)
 {
 	uint32_t id, maskid, tmp;

 	id = mmio_read_32(ZYNQMP_CSU_BASEADDR + ZYNQMP_CSU_IDCODE_OFFSET);

 	tmp = id;
 	tmp &= ZYNQMP_CSU_IDCODE_XILINX_ID_MASK |
 	       ZYNQMP_CSU_IDCODE_FAMILY_MASK;
 	maskid = ZYNQMP_CSU_IDCODE_XILINX_ID << ZYNQMP_CSU_IDCODE_XILINX_ID_SHIFT |
 		 ZYNQMP_CSU_IDCODE_FAMILY << ZYNQMP_CSU_IDCODE_FAMILY_SHIFT;
 	if (tmp != maskid) {
 		ERROR("Incorrect IDCODE 0x%x, maskid 0x%x\n", id, maskid);
 		return "UNKN";
 	}
 	VERBOSE("IDCODE 0x%x\n", id);
 	return zynqmp_get_silicon_idcode_name();
 }

 int32_t plat_is_smccc_feature_available(u_register_t fid)
 {
 	switch (fid) {
 	case SMCCC_ARCH_SOC_ID:
 		return SMC_ARCH_CALL_SUCCESS;
 	default:
 		return SMC_ARCH_CALL_NOT_SUPPORTED;
 	}

 	return SMC_ARCH_CALL_NOT_SUPPORTED;
 }

 int32_t plat_get_soc_version(void)
 {
 	uint32_t chip_id = zynqmp_get_silicon_ver();
 	uint32_t manfid = SOC_ID_SET_JEP_106(JEDEC_XILINX_BKID, JEDEC_XILINX_MFID);

 	return (int32_t)(manfid | (chip_id & 0xFFFF));
 }

 int32_t plat_get_soc_revision(void)
 {
 	return mmio_read_32(ZYNQMP_CSU_BASEADDR + ZYNQMP_CSU_IDCODE_OFFSET);
 }

 static uint32_t zynqmp_get_ps_ver(void)
 {
 	uint32_t ver = mmio_read_32(ZYNQMP_CSU_BASEADDR + ZYNQMP_CSU_VERSION_OFFSET);

 	ver &= ZYNQMP_PS_VER_MASK;
 	ver >>= ZYNQMP_PS_VER_SHIFT;

 	return ver + 1U;
 }

 static void zynqmp_print_platform_name(void)
 {
 	uint32_t ver = zynqmp_get_silicon_ver();
 	uint32_t rtl = zynqmp_get_rtl_ver();
 	char *label = "Unknown";

 	switch (ver) {
 	case ZYNQMP_CSU_VERSION_QEMU:
 		label = "QEMU";
 		break;
 	case ZYNQMP_CSU_VERSION_SILICON:
 		label = "silicon";
 		break;
 	default:
 		/* Do nothing in default case */
 		break;
 	}

 	VERBOSE("TF-A running on %s/%s at 0x%x\n",
 		zynqmp_print_silicon_idcode(), label, BL31_BASE);
 	VERBOSE("TF-A running on v%d/RTL%d.%d\n",
 	       zynqmp_get_ps_ver(), (rtl & 0xf0) >> 4, rtl & 0xf);
 }
 #else
 static inline void zynqmp_print_platform_name(void) { }
 #endif

 uint32_t zynqmp_get_bootmode(void)
 {
 	uint32_t r;
 	unsigned int ret;

 	ret = pm_mmio_read(CRL_APB_BOOT_MODE_USER, &r);

 	if (ret != PM_RET_SUCCESS) {
 		r = mmio_read_32(CRL_APB_BOOT_MODE_USER);
 	}

 	return r & CRL_APB_BOOT_MODE_MASK;
 }

 void zynqmp_config_setup(void)
 {
 	uint64_t counter_freq;

 	/* Configure IPI data for ZynqMP */
 	zynqmp_ipi_config_table_init();

 	zynqmp_print_platform_name();

 	/* Configure counter frequency */
 	counter_freq = read_cntfrq_el0();
 	if (counter_freq == ZYNQMP_DEFAULT_COUNTER_FREQ) {
 		write_cntfrq_el0(plat_get_syscnt_freq2());
 	}

 	generic_delay_timer_init();
 }

 uint32_t plat_get_syscnt_freq2(void)
 {
 	uint32_t ver = zynqmp_get_silicon_ver();

 	if (ver == ZYNQMP_CSU_VERSION_QEMU) {
 		return 65000000;
 	} else {
 		return mmio_read_32(IOU_SCNTRS_BASEFREQ);
 	}
 }
	/*
	* Copyright (c) 2013-2022, Arm Limited and Contributors. All rights reserved.
	* Copyright (c) 2022-2023, Advanced Micro Devices, Inc. All rights reserved.
	*
	* SPDX-License-Identifier: BSD-3-Clause
	*/

	#include <stdbool.h>
	#include <string.h>

	#include <common/debug.h>
	#include <drivers/generic_delay_timer.h>
	#include <lib/mmio.h>
	#include <lib/smccc.h>
	#include <lib/xlat_tables/xlat_tables.h>
	#include <plat/common/platform.h>
	#include <services/arm_arch_svc.h>

	#include <plat_ipi.h>
	#include <plat_private.h>
	#include <plat_startup.h>

	#include "zynqmp_pm_api_sys.h"

	/*
	* Table of regions to map using the MMU.
	* This doesn't include TZRAM as the 'mem_layout' argument passed to
	* configure_mmu_elx() will give the available subset of that,
	*/
	const mmap_region_t plat_zynqmp_mmap[] = {
	{ DEVICE0_BASE, DEVICE0_BASE, DEVICE0_SIZE, MT_DEVICE \| MT_RW \| MT_SECURE },
	{ DEVICE1_BASE, DEVICE1_BASE, DEVICE1_SIZE, MT_DEVICE \| MT_RW \| MT_SECURE },
	{ CRF_APB_BASE, CRF_APB_BASE, CRF_APB_SIZE, MT_DEVICE \| MT_RW \| MT_SECURE },
	{0}
	};

	const mmap_region_t *plat_get_mmap(void)
	{
	return plat_zynqmp_mmap;
	}

	static uint32_t zynqmp_get_silicon_ver(void)
	{
	static unsigned int ver;

	if (!ver) {
	ver = mmio_read_32(ZYNQMP_CSU_BASEADDR +
	ZYNQMP_CSU_VERSION_OFFSET);
	ver &= ZYNQMP_SILICON_VER_MASK;
	ver >>= ZYNQMP_SILICON_VER_SHIFT;
	}

	return ver;
	}

	uint32_t get_uart_clk(void)
	{
	unsigned int ver = zynqmp_get_silicon_ver();

	if (ver == ZYNQMP_CSU_VERSION_QEMU) {
	return 133000000;
	} else {
	return 100000000;
	}
	}

	#if LOG_LEVEL >= LOG_LEVEL_NOTICE
	static const struct {
	uint8_t id;
	bool evexists;
	uint16_t ver;
	char *name;
	} __packed zynqmp_devices[] = {
	{
	.id = 0x10,
	.name = "XCZU3EG",
	},
	{
	.id = 0x10,
	.ver = 0x2c,
	.name = "XCZU3CG",
	},
	{
	.id = 0x11,
	.name = "XCZU2EG",
	},
	{
	.id = 0x11,
	.ver = 0x2c,
	.name = "XCZU2CG",
	},
	{
	.id = 0x20,
	.name = "XCZU5EV",
	.evexists = true,
	},
	{
	.id = 0x20,
	.ver = 0x100,
	.name = "XCZU5EG",
	.evexists = true,
	},
	{
	.id = 0x20,
	.ver = 0x12c,
	.name = "XCZU5CG",
	},
	{
	.id = 0x21,
	.name = "XCZU4EV",
	.evexists = true,
	},
	{
	.id = 0x21,
	.ver = 0x100,
	.name = "XCZU4EG",
	.evexists = true,
	},
	{
	.id = 0x21,
	.ver = 0x12c,
	.name = "XCZU4CG",
	},
	{
	.id = 0x30,
	.name = "XCZU7EV",
	.evexists = true,
	},
	{
	.id = 0x30,
	.ver = 0x100,
	.name = "XCZU7EG",
	.evexists = true,
	},
	{
	.id = 0x30,
	.ver = 0x12c,
	.name = "XCZU7CG",
	},
	{
	.id = 0x38,
	.name = "XCZU9EG",
	},
	{
	.id = 0x38,
	.ver = 0x2c,
	.name = "XCZU9CG",
	},
	{
	.id = 0x39,
	.name = "XCZU6EG",
	},
	{
	.id = 0x39,
	.ver = 0x2c,
	.name = "XCZU6CG",
	},
	{
	.id = 0x40,
	.name = "XCZU11EG",
	},
	{
	.id = 0x50,
	.name = "XCZU15EG",
	},
	{
	.id = 0x58,
	.name = "XCZU19EG",
	},
	{
	.id = 0x59,
	.name = "XCZU17EG",
	},
	{
	.id = 0x60,
	.name = "XCZU28DR",
	},
	{
	.id = 0x61,
	.name = "XCZU21DR",
	},
	{
	.id = 0x62,
	.name = "XCZU29DR",
	},
	{
	.id = 0x63,
	.name = "XCZU23DR",
	},
	{
	.id = 0x64,
	.name = "XCZU27DR",
	},
	{
	.id = 0x65,
	.name = "XCZU25DR",
	},
	{
	.id = 0x66,
	.name = "XCZU39DR",
	},
	{
	.id = 0x7d,
	.name = "XCZU43DR",
	},
	{
	.id = 0x78,
	.name = "XCZU46DR",
	},
	{
	.id = 0x7f,
	.name = "XCZU47DR",
	},
	{
	.id = 0x7b,
	.name = "XCZU48DR",
	},
	{
	.id = 0x7e,
	.name = "XCZU49DR",
	},
	};

	#define ZYNQMP_PL_STATUS_BIT 9
	#define ZYNQMP_PL_STATUS_MASK BIT(ZYNQMP_PL_STATUS_BIT)
	#define ZYNQMP_CSU_VERSION_MASK ~(ZYNQMP_PL_STATUS_MASK)

	#define SILICON_ID_XCK24 0x4712093U
	#define SILICON_ID_XCK26 0x4724093U

	static char *zynqmp_get_silicon_idcode_name(void)
	{
	uint32_t id, ver, chipid[2];
	size_t i, j, len;
	const char *name = "EG/EV";

	if (pm_get_chipid(chipid) != PM_RET_SUCCESS) {
	return "XCZUUNKN";
	}

	id = chipid[0] & (ZYNQMP_CSU_IDCODE_DEVICE_CODE_MASK \|
	ZYNQMP_CSU_IDCODE_SVD_MASK);
	id >>= ZYNQMP_CSU_IDCODE_SVD_SHIFT;
	ver = chipid[1] >> ZYNQMP_EFUSE_IPDISABLE_SHIFT;

	for (i = 0; i < ARRAY_SIZE(zynqmp_devices); i++) {
	if (zynqmp_devices[i].id == id &&
	zynqmp_devices[i].ver == (ver & ZYNQMP_CSU_VERSION_MASK)) {
	break;
	}
	}

	if (i >= ARRAY_SIZE(zynqmp_devices)) {
	switch (chipid[0]) {
	case SILICON_ID_XCK24:
	return "XCK24";
	case SILICON_ID_XCK26:
	return "XCK26";
	default:
	return "XCZUUNKN";
	}
	}

	if (!zynqmp_devices[i].evexists) {
	return zynqmp_devices[i].name;
	}

	if ((ver & ZYNQMP_PL_STATUS_MASK) != 0U) {
	return zynqmp_devices[i].name;
	}

	len = strlen(zynqmp_devices[i].name) - 2;
	for (j = 0; j < strlen(name); j++) {
	zynqmp_devices[i].name[len] = name[j];
	len++;
	}
	zynqmp_devices[i].name[len] = '\0';

	return zynqmp_devices[i].name;
	}

	static unsigned int zynqmp_get_rtl_ver(void)
	{
	uint32_t ver;

	ver = mmio_read_32(ZYNQMP_CSU_BASEADDR + ZYNQMP_CSU_VERSION_OFFSET);
	ver &= ZYNQMP_RTL_VER_MASK;
	ver >>= ZYNQMP_RTL_VER_SHIFT;

	return ver;
	}

	static char *zynqmp_print_silicon_idcode(void)
	{
	uint32_t id, maskid, tmp;

	id = mmio_read_32(ZYNQMP_CSU_BASEADDR + ZYNQMP_CSU_IDCODE_OFFSET);

	tmp = id;
	tmp &= ZYNQMP_CSU_IDCODE_XILINX_ID_MASK \|
	ZYNQMP_CSU_IDCODE_FAMILY_MASK;
	maskid = ZYNQMP_CSU_IDCODE_XILINX_ID << ZYNQMP_CSU_IDCODE_XILINX_ID_SHIFT \|
	ZYNQMP_CSU_IDCODE_FAMILY << ZYNQMP_CSU_IDCODE_FAMILY_SHIFT;
	if (tmp != maskid) {
	ERROR("Incorrect IDCODE 0x%x, maskid 0x%x\n", id, maskid);
	return "UNKN";
	}
	VERBOSE("IDCODE 0x%x\n", id);
	return zynqmp_get_silicon_idcode_name();
	}

	int32_t plat_is_smccc_feature_available(u_register_t fid)
	{
	switch (fid) {
	case SMCCC_ARCH_SOC_ID:
	return SMC_ARCH_CALL_SUCCESS;
	default:
	return SMC_ARCH_CALL_NOT_SUPPORTED;
	}

	return SMC_ARCH_CALL_NOT_SUPPORTED;
	}

	int32_t plat_get_soc_version(void)
	{
	uint32_t chip_id = zynqmp_get_silicon_ver();
	uint32_t manfid = SOC_ID_SET_JEP_106(JEDEC_XILINX_BKID, JEDEC_XILINX_MFID);

	return (int32_t)(manfid \| (chip_id & 0xFFFF));
	}

	int32_t plat_get_soc_revision(void)
	{
	return mmio_read_32(ZYNQMP_CSU_BASEADDR + ZYNQMP_CSU_IDCODE_OFFSET);
	}

	static uint32_t zynqmp_get_ps_ver(void)
	{
	uint32_t ver = mmio_read_32(ZYNQMP_CSU_BASEADDR + ZYNQMP_CSU_VERSION_OFFSET);

	ver &= ZYNQMP_PS_VER_MASK;
	ver >>= ZYNQMP_PS_VER_SHIFT;

	return ver + 1U;
	}

	static void zynqmp_print_platform_name(void)
	{
	uint32_t ver = zynqmp_get_silicon_ver();
	uint32_t rtl = zynqmp_get_rtl_ver();
	char *label = "Unknown";

	switch (ver) {
	case ZYNQMP_CSU_VERSION_QEMU:
	label = "QEMU";
	break;
	case ZYNQMP_CSU_VERSION_SILICON:
	label = "silicon";
	break;
	default:
	/* Do nothing in default case */
	break;
	}

	VERBOSE("TF-A running on %s/%s at 0x%x\n",
	zynqmp_print_silicon_idcode(), label, BL31_BASE);
	VERBOSE("TF-A running on v%d/RTL%d.%d\n",
	zynqmp_get_ps_ver(), (rtl & 0xf0) >> 4, rtl & 0xf);
	}
	#else
	static inline void zynqmp_print_platform_name(void) { }
	#endif

	uint32_t zynqmp_get_bootmode(void)
	{
	uint32_t r;
	unsigned int ret;

	ret = pm_mmio_read(CRL_APB_BOOT_MODE_USER, &r);

	if (ret != PM_RET_SUCCESS) {
	r = mmio_read_32(CRL_APB_BOOT_MODE_USER);
	}

	return r & CRL_APB_BOOT_MODE_MASK;
	}

	void zynqmp_config_setup(void)
	{
	uint64_t counter_freq;

	/* Configure IPI data for ZynqMP */
	zynqmp_ipi_config_table_init();

	zynqmp_print_platform_name();

	/* Configure counter frequency */
	counter_freq = read_cntfrq_el0();
	if (counter_freq == ZYNQMP_DEFAULT_COUNTER_FREQ) {
	write_cntfrq_el0(plat_get_syscnt_freq2());
	}

	generic_delay_timer_init();
	}

	uint32_t plat_get_syscnt_freq2(void)
	{
	uint32_t ver = zynqmp_get_silicon_ver();

	if (ver == ZYNQMP_CSU_VERSION_QEMU) {
	return 65000000;
	} else {
	return mmio_read_32(IOU_SCNTRS_BASEFREQ);
	}
	}