linux/arch/powerpc/boot/fsl-soc.c
Scott Wood bbc6fac387 [POWERPC] bootwrapper: Add fsl_get_immr() and 8xx/pq2 clock functions.
fsl_get_immr() uses /soc/ranges to determine the immr.

mpc885_get_clock() transforms a crystal frequency into a system frequency
according to the PLL register settings.

pq2_get_clocks() does the same as the above for the PowerQUICC II,
except that it produces several different clocks.

The mpc8xx/pq2 set_clocks() functions modify common properties in
the device tree based on the given clock data.

The mpc885/pq2 fixup_clocks() functions call get_clocks(), and
pass the results to set_clocks().

Signed-off-by: Scott Wood <scottwood@freescale.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2007-10-03 20:36:35 -05:00

57 lines
1.1 KiB
C

/*
* Freescale SOC support functions
*
* Author: Scott Wood <scottwood@freescale.com>
*
* Copyright (c) 2007 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include "ops.h"
#include "types.h"
#include "fsl-soc.h"
#include "stdio.h"
static u32 prop_buf[MAX_PROP_LEN / 4];
u32 *fsl_get_immr(void)
{
void *soc;
unsigned long ret = 0;
soc = find_node_by_devtype(NULL, "soc");
if (soc) {
int size;
u32 naddr;
size = getprop(soc, "#address-cells", prop_buf, MAX_PROP_LEN);
if (size == 4)
naddr = prop_buf[0];
else
naddr = 2;
if (naddr != 1 && naddr != 2)
goto err;
size = getprop(soc, "ranges", prop_buf, MAX_PROP_LEN);
if (size < 12)
goto err;
if (prop_buf[0] != 0)
goto err;
if (naddr == 2 && prop_buf[1] != 0)
goto err;
if (!dt_xlate_addr(soc, prop_buf + naddr, 8, &ret))
ret = 0;
}
err:
if (!ret)
printf("fsl_get_immr: Failed to find immr base\r\n");
return (u32 *)ret;
}