mirror of
https://github.com/torvalds/linux.git
synced 2024-11-19 18:41:48 +00:00
a1d0d98daf
Add a platform for the Wire Speed Processor, based on the PPC A2. This includes code for the ICS & OPB interrupt controllers, as well as a SCOM backend, and SCOM based cpu bringup. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Jack Miller <jack@codezen.org> Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
/*
|
|
* SCOM backend for WSP
|
|
*
|
|
* Copyright 2010 Benjamin Herrenschmidt, IBM Corp.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/cpumask.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <asm/cputhreads.h>
|
|
#include <asm/reg_a2.h>
|
|
#include <asm/scom.h>
|
|
#include <asm/udbg.h>
|
|
|
|
#include "wsp.h"
|
|
|
|
|
|
static scom_map_t wsp_scom_map(struct device_node *dev, u64 reg, u64 count)
|
|
{
|
|
struct resource r;
|
|
u64 xscom_addr;
|
|
|
|
if (!of_get_property(dev, "scom-controller", NULL)) {
|
|
pr_err("%s: device %s is not a SCOM controller\n",
|
|
__func__, dev->full_name);
|
|
return SCOM_MAP_INVALID;
|
|
}
|
|
|
|
if (of_address_to_resource(dev, 0, &r)) {
|
|
pr_debug("Failed to find SCOM controller address\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Transform the SCOM address into an XSCOM offset */
|
|
xscom_addr = ((reg & 0x7f000000) >> 1) | ((reg & 0xfffff) << 3);
|
|
|
|
return (scom_map_t)ioremap(r.start + xscom_addr, count << 3);
|
|
}
|
|
|
|
static void wsp_scom_unmap(scom_map_t map)
|
|
{
|
|
iounmap((void *)map);
|
|
}
|
|
|
|
static u64 wsp_scom_read(scom_map_t map, u32 reg)
|
|
{
|
|
u64 __iomem *addr = (u64 __iomem *)map;
|
|
|
|
return in_be64(addr + reg);
|
|
}
|
|
|
|
static void wsp_scom_write(scom_map_t map, u32 reg, u64 value)
|
|
{
|
|
u64 __iomem *addr = (u64 __iomem *)map;
|
|
|
|
return out_be64(addr + reg, value);
|
|
}
|
|
|
|
static const struct scom_controller wsp_scom_controller = {
|
|
.map = wsp_scom_map,
|
|
.unmap = wsp_scom_unmap,
|
|
.read = wsp_scom_read,
|
|
.write = wsp_scom_write
|
|
};
|
|
|
|
void scom_init_wsp(void)
|
|
{
|
|
scom_init(&wsp_scom_controller);
|
|
}
|