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platform: Modify DT using libfdt

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Perform following DT updates.
1. Mask hart if mmu is not supported.
2. Add stdout-path under chosen node.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Atish Patra
2019-01-09 00:52:02 -08:00
committed by Anup Patel
parent 384ba7f7f1
commit 3075da07b6
1 changed files with 37 additions and 4 deletions
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41
platform/sifive/fu540/platform.c
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@@ -7,8 +7,11 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <libfdt.h>
#include <fdt.h>
#include <sbi/riscv_encoding.h>
#include <sbi/sbi_const.h>
#include <sbi/sbi_console.h>
#include <sbi/sbi_platform.h>
#include <sbi/riscv_io.h>
#include <plat/irqchip/plic.h>
@@ -38,18 +41,48 @@
#define FU540_PRCI_CLKMUXSTATUSREG 0x002C
#define FU540_PRCI_CLKMUX_STATUS_TLCLKSEL (0x1 << 1)
static void fu540_modify_dt(void *fdt)
{
u32 i, size;
int chosen_offset, err;
int cpu_offset;
char cpu_node[32] = "";
const char *mmu_type;
for (i = 0; i < FU540_HART_COUNT; i++) {
sbi_sprintf(cpu_node, "/cpus/cpu@%d", i);
cpu_offset = fdt_path_offset(fdt, cpu_node);
mmu_type = fdt_getprop(fdt, cpu_offset, "mmu-type", NULL);
if (mmu_type && (!strcmp(mmu_type, "riscv,sv39") ||
!strcmp(mmu_type,"riscv,sv48")))
continue;
else
fdt_setprop_string(fdt, cpu_offset, "status", "masked");
memset(cpu_node, 0, sizeof(cpu_node));
}
size = fdt_totalsize(fdt);
err = fdt_open_into(fdt, fdt, size + 256);
if (err < 0)
sbi_printf("Device Tree can't be expanded to accmodate new node");
chosen_offset = fdt_path_offset(fdt, "/chosen");
fdt_setprop_string(fdt, chosen_offset, "stdout-path",
"/soc/serial@10010000:115200");
plic_fdt_fixup(fdt, "riscv,plic0", 0);
for (i = 1; i < FU540_HART_COUNT; i++)
plic_fdt_fixup(fdt, "riscv,plic0", 2 * i - 1);
}
static int fu540_final_init(u32 hartid, bool cold_boot)
{
u32 i;
void *fdt;
if (!cold_boot)
return 0;
fdt = sbi_scratch_thishart_arg1_ptr();
plic_fdt_fixup(fdt, "riscv,plic0", 0);
for (i = 1; i < FU540_HART_COUNT; i++)
plic_fdt_fixup(fdt, "riscv,plic0", 2 * i - 1);
fu540_modify_dt(fdt);
return 0;
}