linux/arch/powerpc/sysdev/dcr.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
Based on 1 normalized pattern(s):

  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 this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

223 lines
5.4 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
* <benh@kernel.crashing.org>
*/
#undef DEBUG
#include <linux/kernel.h>
#include <linux/export.h>
#include <asm/prom.h>
#include <asm/dcr.h>
#ifdef CONFIG_PPC_DCR_MMIO
static struct device_node *find_dcr_parent(struct device_node *node)
{
struct device_node *par, *tmp;
const u32 *p;
for (par = of_node_get(node); par;) {
if (of_get_property(par, "dcr-controller", NULL))
break;
p = of_get_property(par, "dcr-parent", NULL);
tmp = par;
if (p == NULL)
par = of_get_parent(par);
else
par = of_find_node_by_phandle(*p);
of_node_put(tmp);
}
return par;
}
#endif
#if defined(CONFIG_PPC_DCR_NATIVE) && defined(CONFIG_PPC_DCR_MMIO)
bool dcr_map_ok_generic(dcr_host_t host)
{
if (host.type == DCR_HOST_NATIVE)
return dcr_map_ok_native(host.host.native);
else if (host.type == DCR_HOST_MMIO)
return dcr_map_ok_mmio(host.host.mmio);
else
return false;
}
EXPORT_SYMBOL_GPL(dcr_map_ok_generic);
dcr_host_t dcr_map_generic(struct device_node *dev,
unsigned int dcr_n,
unsigned int dcr_c)
{
dcr_host_t host;
struct device_node *dp;
const char *prop;
host.type = DCR_HOST_INVALID;
dp = find_dcr_parent(dev);
if (dp == NULL)
return host;
prop = of_get_property(dp, "dcr-access-method", NULL);
pr_debug("dcr_map_generic(dcr-access-method = %s)\n", prop);
if (!strcmp(prop, "native")) {
host.type = DCR_HOST_NATIVE;
host.host.native = dcr_map_native(dev, dcr_n, dcr_c);
} else if (!strcmp(prop, "mmio")) {
host.type = DCR_HOST_MMIO;
host.host.mmio = dcr_map_mmio(dev, dcr_n, dcr_c);
}
of_node_put(dp);
return host;
}
EXPORT_SYMBOL_GPL(dcr_map_generic);
void dcr_unmap_generic(dcr_host_t host, unsigned int dcr_c)
{
if (host.type == DCR_HOST_NATIVE)
dcr_unmap_native(host.host.native, dcr_c);
else if (host.type == DCR_HOST_MMIO)
dcr_unmap_mmio(host.host.mmio, dcr_c);
else /* host.type == DCR_HOST_INVALID */
WARN_ON(true);
}
EXPORT_SYMBOL_GPL(dcr_unmap_generic);
u32 dcr_read_generic(dcr_host_t host, unsigned int dcr_n)
{
if (host.type == DCR_HOST_NATIVE)
return dcr_read_native(host.host.native, dcr_n);
else if (host.type == DCR_HOST_MMIO)
return dcr_read_mmio(host.host.mmio, dcr_n);
else /* host.type == DCR_HOST_INVALID */
WARN_ON(true);
return 0;
}
EXPORT_SYMBOL_GPL(dcr_read_generic);
void dcr_write_generic(dcr_host_t host, unsigned int dcr_n, u32 value)
{
if (host.type == DCR_HOST_NATIVE)
dcr_write_native(host.host.native, dcr_n, value);
else if (host.type == DCR_HOST_MMIO)
dcr_write_mmio(host.host.mmio, dcr_n, value);
else /* host.type == DCR_HOST_INVALID */
WARN_ON(true);
}
EXPORT_SYMBOL_GPL(dcr_write_generic);
#endif /* defined(CONFIG_PPC_DCR_NATIVE) && defined(CONFIG_PPC_DCR_MMIO) */
unsigned int dcr_resource_start(const struct device_node *np,
unsigned int index)
{
unsigned int ds;
const u32 *dr = of_get_property(np, "dcr-reg", &ds);
if (dr == NULL || ds & 1 || index >= (ds / 8))
return 0;
return dr[index * 2];
}
EXPORT_SYMBOL_GPL(dcr_resource_start);
unsigned int dcr_resource_len(const struct device_node *np, unsigned int index)
{
unsigned int ds;
const u32 *dr = of_get_property(np, "dcr-reg", &ds);
if (dr == NULL || ds & 1 || index >= (ds / 8))
return 0;
return dr[index * 2 + 1];
}
EXPORT_SYMBOL_GPL(dcr_resource_len);
#ifdef CONFIG_PPC_DCR_MMIO
static u64 of_translate_dcr_address(struct device_node *dev,
unsigned int dcr_n,
unsigned int *out_stride)
{
struct device_node *dp;
const u32 *p;
unsigned int stride;
u64 ret = OF_BAD_ADDR;
dp = find_dcr_parent(dev);
if (dp == NULL)
return OF_BAD_ADDR;
/* Stride is not properly defined yet, default to 0x10 for Axon */
p = of_get_property(dp, "dcr-mmio-stride", NULL);
stride = (p == NULL) ? 0x10 : *p;
/* XXX FIXME: Which property name is to use of the 2 following ? */
p = of_get_property(dp, "dcr-mmio-range", NULL);
if (p == NULL)
p = of_get_property(dp, "dcr-mmio-space", NULL);
if (p == NULL)
goto done;
/* Maybe could do some better range checking here */
ret = of_translate_address(dp, p);
if (ret != OF_BAD_ADDR)
ret += (u64)(stride) * (u64)dcr_n;
if (out_stride)
*out_stride = stride;
done:
of_node_put(dp);
return ret;
}
dcr_host_mmio_t dcr_map_mmio(struct device_node *dev,
unsigned int dcr_n,
unsigned int dcr_c)
{
dcr_host_mmio_t ret = { .token = NULL, .stride = 0, .base = dcr_n };
u64 addr;
pr_debug("dcr_map(%pOF, 0x%x, 0x%x)\n",
dev, dcr_n, dcr_c);
addr = of_translate_dcr_address(dev, dcr_n, &ret.stride);
pr_debug("translates to addr: 0x%llx, stride: 0x%x\n",
(unsigned long long) addr, ret.stride);
if (addr == OF_BAD_ADDR)
return ret;
pr_debug("mapping 0x%x bytes\n", dcr_c * ret.stride);
ret.token = ioremap(addr, dcr_c * ret.stride);
if (ret.token == NULL)
return ret;
pr_debug("mapped at 0x%p -> base is 0x%p\n",
ret.token, ret.token - dcr_n * ret.stride);
ret.token -= dcr_n * ret.stride;
return ret;
}
EXPORT_SYMBOL_GPL(dcr_map_mmio);
void dcr_unmap_mmio(dcr_host_mmio_t host, unsigned int dcr_c)
{
dcr_host_mmio_t h = host;
if (h.token == NULL)
return;
h.token += host.base * h.stride;
iounmap(h.token);
h.token = NULL;
}
EXPORT_SYMBOL_GPL(dcr_unmap_mmio);
#endif /* defined(CONFIG_PPC_DCR_MMIO) */
#ifdef CONFIG_PPC_DCR_NATIVE
DEFINE_SPINLOCK(dcr_ind_lock);
EXPORT_SYMBOL_GPL(dcr_ind_lock);
#endif /* defined(CONFIG_PPC_DCR_NATIVE) */