[PATCH 3/5] [POWERPC] explicit dcr support

From: Stephen Neuendorffer
Date: Fri Mar 28 2008 - 12:23:33 EST

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Added literal mapping support if no device-tree support. Added
CONFIG_OF to guard device-tree parts, since literal support works for
arch=ppc.

Signed-off-by: Stephen Neuendorffer <stephen.neuendorffer@xxxxxxxxxx>
---
arch/powerpc/sysdev/dcr.c | 82 ++++++++++++++++++++++++++++---------
include/asm-powerpc/dcr-generic.h | 2 +
include/asm-powerpc/dcr-mmio.h | 11 +++++
include/asm-powerpc/dcr-native.h | 8 ++++
include/asm-powerpc/dcr.h | 24 +++++++++++
5 files changed, 108 insertions(+), 19 deletions(-)

diff --git a/arch/powerpc/sysdev/dcr.c b/arch/powerpc/sysdev/dcr.c
index d3de0ff..2ccae80 100644
--- a/arch/powerpc/sysdev/dcr.c
+++ b/arch/powerpc/sysdev/dcr.c
@@ -20,9 +20,34 @@
#undef DEBUG

#include <linux/kernel.h>
+#include <linux/module.h>
#include <asm/prom.h>
#include <asm/dcr.h>

+#ifdef CONFIG_OF
+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 /* CONFIG_OF */
+
+
+/* Indirection layer for providing both NATIVE and MMIO support. */
+
#if defined(CONFIG_PPC_DCR_NATIVE) && defined(CONFIG_PPC_DCR_MMIO)

bool dcr_map_ok_generic(dcr_host_t host)
@@ -36,12 +61,24 @@ bool dcr_map_ok_generic(dcr_host_t host)
}
EXPORT_SYMBOL_GPL(dcr_map_ok_generic);

+#ifdef CONFIG_OF
dcr_host_t dcr_map_generic(struct device_node *dev,
unsigned int dcr_n,
unsigned int dcr_c)
{
dcr_host_t host;
- const char *prop = of_get_property(dev, "dcr-access-method", NULL);
+ struct device_node *dp;
+
+ dp = find_dcr_parent(dev);
+ if (dp == NULL) {
+ host.type = INVALID;
+ return host;
+ }
+
+ const char *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 = NATIVE;
@@ -56,6 +93,8 @@ dcr_host_t dcr_map_generic(struct device_node *dev,
}
EXPORT_SYMBOL_GPL(dcr_map_generic);

+#endif /* CONFIG_OF */
+
void dcr_unmap_generic(dcr_host_t host, unsigned int dcr_c)
{
if (host.type == NATIVE)
@@ -85,9 +124,10 @@ EXPORT_SYMBOL_GPL(dcr_write_generic);

#endif /* defined(CONFIG_PPC_DCR_NATIVE) && defined(CONFIG_PPC_DCR_MMIO) */

+#ifdef CONFIG_OF
unsigned int dcr_resource_start(struct device_node *np, unsigned int index)
{
- unsigned int ds;
+ int ds;
const u32 *dr = of_get_property(np, "dcr-reg", &ds);

if (dr == NULL || ds & 1 || index >= (ds / 8))
@@ -99,7 +139,7 @@ EXPORT_SYMBOL_GPL(dcr_resource_start);

unsigned int dcr_resource_len(struct device_node *np, unsigned int index)
{
- unsigned int ds;
+ int ds;
const u32 *dr = of_get_property(np, "dcr-reg", &ds);

if (dr == NULL || ds & 1 || index >= (ds / 8))
@@ -109,26 +149,28 @@ unsigned int dcr_resource_len(struct device_node *np, unsigned int index)
}
EXPORT_SYMBOL_GPL(dcr_resource_len);

+#endif /* CONFIG_OF */
+
+
+
+/* Support for MMIO */
#ifdef CONFIG_PPC_DCR_MMIO

-static struct device_node * find_dcr_parent(struct device_node * node)
+dcr_host_mmio_t dcr_map_mmio_literal_mmio(resource_size_t mmio_start,
+ unsigned int stride,
+ unsigned int dcr_n,
+ unsigned int dcr_c)
{
- 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;
+ dcr_host_mmio_t host;
+ host.stride = stride;
+ host.token = ioremap(mmio_start, dcr_c * stride);
+ host.token -= dcr_n * stride;
+ host.base = dcr_n;
+ return host;
}
+EXPORT_SYMBOL_GPL(dcr_map_mmio_literal_mmio);
+
+#ifdef CONFIG_OF

u64 of_translate_dcr_address(struct device_node *dev,
unsigned int dcr_n,
@@ -189,6 +231,8 @@ dcr_host_mmio_t dcr_map_mmio(struct device_node *dev,
}
EXPORT_SYMBOL_GPL(dcr_map_mmio);

+#endif /* CONFIG_OF */
+
void dcr_unmap_mmio(dcr_host_mmio_t host, unsigned int dcr_c)
{
dcr_host_mmio_t h = host;
diff --git a/include/asm-powerpc/dcr-generic.h b/include/asm-powerpc/dcr-generic.h
index 0ee74fb..8032795 100644
--- a/include/asm-powerpc/dcr-generic.h
+++ b/include/asm-powerpc/dcr-generic.h
@@ -34,8 +34,10 @@ typedef struct {

extern bool dcr_map_ok_generic(dcr_host_t host);

+#ifdef CONFIG_OF
extern dcr_host_t dcr_map_generic(struct device_node *dev, unsigned int dcr_n,
unsigned int dcr_c);
+#endif
extern void dcr_unmap_generic(dcr_host_t host, unsigned int dcr_c);

extern u32 dcr_read_generic(dcr_host_t host, unsigned int dcr_n);
diff --git a/include/asm-powerpc/dcr-mmio.h b/include/asm-powerpc/dcr-mmio.h
index acd491d..b12d291 100644
--- a/include/asm-powerpc/dcr-mmio.h
+++ b/include/asm-powerpc/dcr-mmio.h
@@ -34,9 +34,18 @@ static inline bool dcr_map_ok_mmio(dcr_host_mmio_t host)
return host.token != NULL;
}

+extern dcr_host_mmio_t dcr_map_mmio_literal_mmio(resource_size_t mmio_start,
+ unsigned int stride,
+ unsigned int dcr_n,
+ unsigned int dcr_c);
+
+
+#ifdef CONFIG_OF
extern dcr_host_mmio_t dcr_map_mmio(struct device_node *dev,
unsigned int dcr_n,
unsigned int dcr_c);
+#endif
+
extern void dcr_unmap_mmio(dcr_host_mmio_t host, unsigned int dcr_c);

static inline u32 dcr_read_mmio(dcr_host_mmio_t host, unsigned int dcr_n)
@@ -51,9 +60,11 @@ static inline void dcr_write_mmio(dcr_host_mmio_t host,
out_be32(host.token + ((host.base + dcr_n) * host.stride), value);
}

+#ifdef CONFIG_OF
extern u64 of_translate_dcr_address(struct device_node *dev,
unsigned int dcr_n,
unsigned int *stride);
+#endif

#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_DCR_MMIO_H */
diff --git a/include/asm-powerpc/dcr-native.h b/include/asm-powerpc/dcr-native.h
index 67832e5..9b3e255 100644
--- a/include/asm-powerpc/dcr-native.h
+++ b/include/asm-powerpc/dcr-native.h
@@ -33,6 +33,14 @@ static inline bool dcr_map_ok_native(dcr_host_native_t host)
return 1;
}

+static inline
+dcr_host_native_t dcr_map_native_literal_native(unsigned int dcr_n)
+{
+ dcr_host_native_t host;
+ host.base = dcr_n;
+ return host;
+}
+
#define dcr_map_native(dev, dcr_n, dcr_c) \
((dcr_host_native_t){ .base = (dcr_n) })
#define dcr_unmap_native(host, dcr_c) do {} while (0)
diff --git a/include/asm-powerpc/dcr.h b/include/asm-powerpc/dcr.h
index 6b86322..dfd1c24 100644
--- a/include/asm-powerpc/dcr.h
+++ b/include/asm-powerpc/dcr.h
@@ -35,6 +35,27 @@

#include <asm/dcr-generic.h>

+static inline
+dcr_host_t dcr_map_mmio_literal(resource_size_t mmio_start,
+ unsigned int stride,
+ unsigned int dcr_n,
+ unsigned int dcr_c)
+{
+ dcr_host_t host;
+ host.type = MMIO;
+ host.host.mmio =
+ dcr_map_mmio_literal_mmio(mmio_start, stride, dcr_n, dcr_c);
+ return host;
+}
+static inline
+dcr_host_t dcr_map_native_literal(unsigned int dcr_n)
+{
+ dcr_host_t host;
+ host.type = NATIVE;
+ host.host.native = dcr_map_native_literal_native(dcr_n);
+ return host;
+}
+
#define DCR_MAP_OK(host) dcr_map_ok_generic(host)
#define dcr_map(dev, dcr_n, dcr_c) dcr_map_generic(dev, dcr_n, dcr_c)
#define dcr_unmap(host, dcr_c) dcr_unmap_generic(host, dcr_c)
@@ -45,6 +66,7 @@

#ifdef CONFIG_PPC_DCR_NATIVE
typedef dcr_host_native_t dcr_host_t;
+#define dcr_map_native_literal(dcr_n) dcr_map_native_literal_native(dcr_n)
#define DCR_MAP_OK(host) dcr_map_ok_native(host)
#define dcr_map(dev, dcr_n, dcr_c) dcr_map_native(dev, dcr_n, dcr_c)
#define dcr_unmap(host, dcr_c) dcr_unmap_native(host, dcr_c)
@@ -52,6 +74,8 @@ typedef dcr_host_native_t dcr_host_t;
#define dcr_write(host, dcr_n, value) dcr_write_native(host, dcr_n, value)
#else
typedef dcr_host_mmio_t dcr_host_t;
+#define dcr_map_mmio_literal(mmio_start, stride, dcr_n, dcr_c) \
+ dcr_map_mmio_literal_mmio(mmio_start, stride, dcr_n, dcr_c)
#define DCR_MAP_OK(host) dcr_map_ok_mmio(host)
#define dcr_map(dev, dcr_n, dcr_c) dcr_map_mmio(dev, dcr_n, dcr_c)
#define dcr_unmap(host, dcr_c) dcr_unmap_mmio(host, dcr_c)
--
1.5.3.4-dirty

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Next message: Etienne Lorrain: "PATCH one line: "vmlinux*.lds*" is in Documentation/dontdiff"
Previous message: Stephen Neuendorffer: "[PATCH 4/5] [POWERPC] Xilinx: Framebuffer: Use dcr infrastructure."
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]