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// 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) */
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