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/*
* (C) Copyright 2016 Linaro
* Jon Medhurst <tixy@linaro.org>
*
* TC2 specific code for Versatile Express.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm/armv7.h>
#include <asm/io.h>
#include <asm/u-boot.h>
#include <common.h>
#include <libfdt.h>
#define SCC_BASE 0x7fff0000
bool armv7_boot_nonsec_default(void)
{
#ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
return false
#else
/*
* The Serial Configuration Controller (SCC) register at address 0x700
* contains flags for configuring the behaviour of the Boot Monitor
* (which CPUs execute from reset). Two of these bits are of interest:
*
* bit 12 = Use per-cpu mailboxes for power management
* bit 13 = Power down the non-boot cluster
*
* It is only when both of these are false that U-Boot's current
* implementation of 'nonsec' mode can work as expected because we
* rely on getting all CPUs to execute _nonsec_init, so let's check that.
*/
return (readl((u32 *)(SCC_BASE + 0x700)) & ((1 << 12) | (1 << 13))) == 0;
#endif
}
#ifdef CONFIG_OF_BOARD_SETUP
int ft_board_setup(void *fdt, bd_t *bd)
{
int offset, tmp, len;
const struct fdt_property *prop;
const char *cci_compatible = "arm,cci-400-ctrl-if";
#ifdef CONFIG_ARMV7_NONSEC
if (!armv7_boot_nonsec())
return 0;
#else
return 0;
#endif
/* Booting in nonsec mode, disable CCI access */
offset = fdt_path_offset(fdt, "/cpus");
if (offset < 0) {
printf("couldn't find /cpus\n");
return offset;
}
/* delete cci-control-port in each cpu node */
for (tmp = fdt_first_subnode(fdt, offset); tmp >= 0;
tmp = fdt_next_subnode(fdt, tmp))
fdt_delprop(fdt, tmp, "cci-control-port");
/* disable all ace cci slave ports */
offset = fdt_node_offset_by_prop_value(fdt, offset, "compatible",
cci_compatible, 20);
while (offset > 0) {
prop = fdt_get_property(fdt, offset, "interface-type",
&len);
if (!prop)
continue;
if (len < 4)
continue;
if (strcmp(prop->data, "ace"))
continue;
fdt_setprop_string(fdt, offset, "status", "disabled");
offset = fdt_node_offset_by_prop_value(fdt, offset, "compatible",
cci_compatible, 20);
}
return 0;
}
#endif /* CONFIG_OF_BOARD_SETUP */
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