提交 a4dc7ff0 编写于 作者: P Paul Mackerras

[POWERPC] Define of_read_ulong helper

There are various places where we want to extract an unsigned long
value from a device-tree property that can be 1 or 2 cells in length.
This replaces some open-coded calculations, and one place where we
assumed without checking that properties were the length we wanted,
with a little of_read_ulong() helper.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
上级 19e59df4
......@@ -757,24 +757,9 @@ static int __init early_init_dt_scan_root(unsigned long node,
static unsigned long __init dt_mem_next_cell(int s, cell_t **cellp)
{
cell_t *p = *cellp;
unsigned long r;
/* Ignore more than 2 cells */
while (s > sizeof(unsigned long) / 4) {
p++;
s--;
}
r = *p++;
#ifdef CONFIG_PPC64
if (s > 1) {
r <<= 32;
r |= *(p++);
s--;
}
#endif
*cellp = p;
return r;
*cellp = p + s;
return of_read_ulong(p, s);
}
......
......@@ -304,18 +304,21 @@ struct seq_operations cpuinfo_op = {
void __init check_for_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
const unsigned long *prop;
const unsigned int *prop;
int len;
DBG(" -> check_for_initrd()\n");
if (of_chosen) {
prop = get_property(of_chosen, "linux,initrd-start", NULL);
prop = get_property(of_chosen, "linux,initrd-start", &len);
if (prop != NULL) {
initrd_start = (unsigned long)__va(*prop);
initrd_start = (unsigned long)
__va(of_read_ulong(prop, len / 4));
prop = get_property(of_chosen,
"linux,initrd-end", NULL);
"linux,initrd-end", &len);
if (prop != NULL) {
initrd_end = (unsigned long)__va(*prop);
initrd_end = (unsigned long)
__va(of_read_ulong(prop, len / 4));
initrd_below_start_ok = 1;
} else
initrd_start = 0;
......
......@@ -870,9 +870,7 @@ static int __init get_freq(char *name, int cells, unsigned long *val)
fp = get_property(cpu, name, NULL);
if (fp) {
found = 1;
*val = 0;
while (cells--)
*val = (*val << 32) | *fp++;
*val = of_read_ulong(fp, cells);
}
of_node_put(cpu);
......
......@@ -197,7 +197,7 @@ extern int release_OF_resource(struct device_node* node, int index);
*/
/* Helper to read a big number */
/* Helper to read a big number; size is in cells (not bytes) */
static inline u64 of_read_number(const u32 *cell, int size)
{
u64 r = 0;
......@@ -206,6 +206,16 @@ static inline u64 of_read_number(const u32 *cell, int size)
return r;
}
/* Like of_read_number, but we want an unsigned long result */
#ifdef CONFIG_PPC32
static inline unsigned long of_read_ulong(const u32 *cell, int size)
{
return cell[size-1];
}
#else
#define of_read_ulong(cell, size) of_read_number(cell, size)
#endif
/* Translate an OF address block into a CPU physical address
*/
#define OF_BAD_ADDR ((u64)-1)
......
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