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// SPDX-License-Identifier: GPL-2.0
#include <linux/libfdt.h>
#include <pbl.h>
#include <printk.h>
void fdt_find_mem(const void *fdt, unsigned long *membase, unsigned long *memsize)
{
const __be32 *nap, *nsp, *reg;
uint32_t na, ns;
uint64_t memsize64, membase64;
int node, size, i;
/* Make sure FDT blob is sane */
if (fdt_check_header(fdt) != 0) {
pr_err("Invalid device tree blob\n");
goto err;
}
/* Find the #address-cells and #size-cells properties */
node = fdt_path_offset(fdt, "/");
if (node < 0) {
pr_err("Cannot find root node\n");
goto err;
}
nap = fdt_getprop(fdt, node, "#address-cells", &size);
if (!nap || (size != 4)) {
pr_err("Cannot find #address-cells property");
goto err;
}
na = fdt32_to_cpu(*nap);
nsp = fdt_getprop(fdt, node, "#size-cells", &size);
if (!nsp || (size != 4)) {
pr_err("Cannot find #size-cells property");
goto err;
}
ns = fdt32_to_cpu(*nap);
/* Find the memory range */
node = fdt_node_offset_by_prop_value(fdt, -1, "device_type",
"memory", sizeof("memory"));
if (node < 0) {
pr_err("Cannot find memory node\n");
goto err;
}
reg = fdt_getprop(fdt, node, "reg", &size);
if (size < (na + ns) * sizeof(u32)) {
pr_err("cannot get memory range\n");
goto err;
}
membase64 = 0;
for (i = 0; i < na; i++)
membase64 = (membase64 << 32) | fdt32_to_cpu(*reg++);
/* get the memsize and truncate it to under 4G on 32 bit machines */
memsize64 = 0;
for (i = 0; i < ns; i++)
memsize64 = (memsize64 << 32) | fdt32_to_cpu(*reg++);
*membase = membase64;
*memsize = memsize64;
return;
err:
pr_err("No memory, cannot continue\n");
while (1);
}
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