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/*
*
* Utility functions for the Freescale MPC52xx.
*
* Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.com>
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*
*/
#undef DEBUG
#include <linux/kernel.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/of_platform.h>
#include <asm/mpc52xx.h>
void __iomem *
mpc52xx_find_and_map(const char *compatible)
{
struct device_node *ofn;
const u32 *regaddr_p;
u64 regaddr64, size64;
ofn = of_find_compatible_node(NULL, NULL, compatible);
if (!ofn)
return NULL;
regaddr_p = of_get_address(ofn, 0, &size64, NULL);
if (!regaddr_p) {
of_node_put(ofn);
return NULL;
}
regaddr64 = of_translate_address(ofn, regaddr_p);
of_node_put(ofn);
return ioremap((u32)regaddr64, (u32)size64);
}
/**
* mpc52xx_find_ipb_freq - Find the IPB bus frequency for a device
* @node: device node
*
* Returns IPB bus frequency, or 0 if the bus frequency cannot be found.
*/
unsigned int
mpc52xx_find_ipb_freq(struct device_node *node)
{
struct device_node *np;
const unsigned int *p_ipb_freq = NULL;
of_node_get(node);
while (node) {
p_ipb_freq = get_property(node, "bus-frequency", NULL);
if (p_ipb_freq)
break;
np = of_get_parent(node);
of_node_put(node);
node = np;
}
if (node)
of_node_put(node);
return p_ipb_freq ? *p_ipb_freq : 0;
}
void __init
mpc52xx_setup_cpu(void)
{
struct mpc52xx_cdm __iomem *cdm;
struct mpc52xx_xlb __iomem *xlb;
/* Map zones */
cdm = mpc52xx_find_and_map("mpc52xx-cdm");
xlb = mpc52xx_find_and_map("mpc52xx-xlb");
if (!cdm || !xlb) {
printk(KERN_ERR __FILE__ ": "
"Error while mapping CDM/XLB during mpc52xx_setup_cpu. "
"Expect some abnormal behavior\n");
goto unmap_regs;
}
/* Use internal 48 Mhz */
out_8(&cdm->ext_48mhz_en, 0x00);
out_8(&cdm->fd_enable, 0x01);
if (in_be32(&cdm->rstcfg) & 0x40) /* Assumes 33Mhz clock */
out_be16(&cdm->fd_counters, 0x0001);
else
out_be16(&cdm->fd_counters, 0x5555);
/* Configure the XLB Arbiter priorities */
out_be32(&xlb->master_pri_enable, 0xff);
out_be32(&xlb->master_priority, 0x11111111);
/* Disable XLB pipelining */
/* (cfr errate 292. We could do this only just before ATA PIO
transaction and re-enable it afterwards ...) */
out_be32(&xlb->config, in_be32(&xlb->config) | MPC52xx_XLB_CFG_PLDIS);
/* Unmap zones */
unmap_regs:
if (cdm) iounmap(cdm);
if (xlb) iounmap(xlb);
}
static int __init
mpc52xx_declare_of_platform_devices(void)
{
/* Find every child of the SOC node and add it to of_platform */
return of_platform_bus_probe(NULL, NULL, NULL);
}
device_initcall(mpc52xx_declare_of_platform_devices);
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