Add enough RTAS support to start adding RTAS commands. Just add
power-off for now.
Signed-off-by: Andrew Jones <drjones@xxxxxxxxxx>
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
Tested-by: Laurent Vivier <lvivier@xxxxxxxxxx>
---
lib/powerpc/asm/rtas.h | 26 +++++++++
lib/powerpc/io.c | 2 +
lib/powerpc/rtas.c | 139 ++++++++++++++++++++++++++++++++++++++++++++++++
lib/ppc64/asm/rtas.h | 1 +
powerpc/Makefile.common | 1 +
5 files changed, 169 insertions(+)
create mode 100644 lib/powerpc/asm/rtas.h
create mode 100644 lib/powerpc/rtas.c
create mode 100644 lib/ppc64/asm/rtas.h
diff --git a/lib/powerpc/asm/rtas.h b/lib/powerpc/asm/rtas.h
new file mode 100644
index 0000000000000..522225bcb6de3
--- /dev/null
+++ b/lib/powerpc/asm/rtas.h
@@ -0,0 +1,26 @@
+#ifndef _ASMPOWERPC_RTAS_H_
+#define _ASMPOWERPC_RTAS_H_
+/*
+ * Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@xxxxxxxxxx>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.
+ */
+#include <libcflat.h>
+
+#define RTAS_UNKNOWN_SERVICE (-1)
+
+struct rtas_args {
+ u32 token;
+ u32 nargs;
+ u32 nret;
+ u32 args[16];
+ u32 *rets;
+};
+
+extern void rtas_init(void);
+extern int rtas_token(const char *service);
+extern int rtas_call(int token, int nargs, int nret, int *outputs, ...);
+
+extern void rtas_power_off(void);
+
+#endif /* _ASMPOWERPC_RTAS_H_ */
diff --git a/lib/powerpc/io.c b/lib/powerpc/io.c
index 5e1fa8dd96ab6..e57a28c583eb0 100644
--- a/lib/powerpc/io.c
+++ b/lib/powerpc/io.c
@@ -7,6 +7,7 @@
*/
#include <libcflat.h>
#include <asm/spinlock.h>
+#include <asm/rtas.h>
extern void halt(int code);
extern void putchar(int c);
@@ -15,6 +16,7 @@ static struct spinlock uart_lock;
void io_init(void)
{
+ rtas_init();
}
void puts(const char *s)
diff --git a/lib/powerpc/rtas.c b/lib/powerpc/rtas.c
new file mode 100644
index 0000000000000..c51c52c734b38
--- /dev/null
+++ b/lib/powerpc/rtas.c
@@ -0,0 +1,139 @@
+/*
+ * powerpc RTAS
+ *
+ * Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@xxxxxxxxxx>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.
+ */
+#include <libcflat.h>
+#include <libfdt/libfdt.h>
+#include <devicetree.h>
+#include <asm/spinlock.h>
+#include <asm/hcall.h>
+#include <asm/io.h>
+#include <asm/rtas.h>
+
+#if defined(__powerpc64__)
+struct func_ptr {
+ unsigned long ptr;
+ unsigned long toc;
+};
+static struct func_ptr rtas_entry_funcptr;
+#endif
+typedef void (*rtas_entry_t)(unsigned long);
+static rtas_entry_t enter_rtas;
+static struct rtas_args rtas_args;
+static struct spinlock rtas_lock;
+
+static int rtas_node(void)
+{
+ int node = fdt_path_offset(dt_fdt(), "/rtas");
+
+ if (node < 0) {
+ printf("%s: /rtas: %s\n", __func__, fdt_strerror(node));
+ abort();
+ }
+
+ return node;
+}
+
+void rtas_init(void)
+{
+ const struct fdt_property *prop;
+ int node = rtas_node(), len;
+ unsigned long entry;
+ u32 *data;
+
+ if (!dt_available()) {
+ printf("%s: No device tree!\n", __func__);
+ abort();
+ }
+
+ prop = fdt_get_property(dt_fdt(), node,
+ "linux,rtas-entry", &len);
+ if (!prop) {
+ printf("%s: /rtas/linux,rtas-entry: %s\n",
+ __func__, fdt_strerror(len));
+ abort();
+ }
+
+ data = (u32 *)prop->data;
+ entry = (unsigned long)fdt32_to_cpu(*data);
+
+ if (hcall_have_broken_sc1()) {
+ u32 *insn = (u32 *)entry;
+ int size, i;
+
+ prop = fdt_get_property(dt_fdt(), node,
+ "rtas-size", &len);
+ if (!prop) {
+ printf("%s: /rtas/rtas-size: %s\n",
+ __func__, fdt_strerror(len));
+ abort();
+ }
+ data = (u32 *)prop->data;
+ size = (int)fdt32_to_cpu(*data);
+
+ for (i = 0; i < size/4; ++i)
+ if (insn[i] == SC1)
+ insn[i] = SC1_REPLACEMENT;
+ }
+
+#if defined(__powerpc64__)
+ rtas_entry_funcptr.ptr = entry;
+ enter_rtas = (rtas_entry_t)&rtas_entry_funcptr;
+#else
+ enter_rtas = (rtas_entry_t)entry;
+#endif
+}
+
+int rtas_token(const char *service)
+{
+ const struct fdt_property *prop;
+ u32 *token;
+
+ prop = fdt_get_property(dt_fdt(), rtas_node(), service, NULL);
+ if (prop) {
+ token = (u32 *)prop->data;
+ return fdt32_to_cpu(*token);
+ }
+ return RTAS_UNKNOWN_SERVICE;
+}
+
+int rtas_call(int token, int nargs, int nret, int *outputs, ...)
+{
+ va_list list;
+ int ret, i;
+
+ spin_lock(&rtas_lock);
+
+ rtas_args.token = cpu_to_be32(token);
+ rtas_args.nargs = cpu_to_be32(nargs);
+ rtas_args.nret = cpu_to_be32(nret);
+ rtas_args.rets = &rtas_args.args[nargs];
+
+ va_start(list, outputs);
+ for (i = 0; i < nargs; ++i)
+ rtas_args.args[i] = cpu_to_be32(va_arg(list, u32));
+ va_end(list);
+
+ for (i = 0; i < nret; ++i)
+ rtas_args.rets[i] = 0;
+
+ enter_rtas(__pa(&rtas_args));
+
+ if (nret > 1 && outputs != NULL)
+ for (i = 0; i < nret - 1; ++i)
+ outputs[i] = be32_to_cpu(rtas_args.rets[i + 1]);
+
+ ret = nret > 0 ? be32_to_cpu(rtas_args.rets[0]) : 0;
+
+ spin_unlock(&rtas_lock);
+ return ret;
+}
+
+void rtas_power_off(void)
+{
+ int ret = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
+ printf("RTAS power-off returned %d\n", ret);
+}
diff --git a/lib/ppc64/asm/rtas.h b/lib/ppc64/asm/rtas.h
new file mode 100644
index 0000000000000..fe77f635cd860
--- /dev/null
+++ b/lib/ppc64/asm/rtas.h
@@ -0,0 +1 @@
+#include "../../powerpc/asm/rtas.h"
diff --git a/powerpc/Makefile.common b/powerpc/Makefile.common
index 9654bce1752eb..3a03ab6dfc3e9 100644
--- a/powerpc/Makefile.common
+++ b/powerpc/Makefile.common
@@ -33,6 +33,7 @@ cflatobjs += lib/devicetree.o
cflatobjs += lib/powerpc/io.o
cflatobjs += lib/powerpc/hcall.o
cflatobjs += lib/powerpc/setup.o
+cflatobjs += lib/powerpc/rtas.o
libgcc := $(shell $(CC) $(machine) --print-libgcc-file-name)
start_addr := $(shell printf "%x\n" $$(( $(phys_base) + $(kernel_offset) )))
--
2.4.3
--
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