powerpc: Merge rtas.c into arch/powerpc/kernel

This splits arch/ppc64/kernel/rtas.c into arch/powerpc/kernel/rtas.c,
which contains generic RTAS functions useful on any CHRP platform,
and arch/powerpc/platforms/pseries/rtas-fw.[ch], which contain
some pSeries-specific firmware flashing bits.  The parts of rtas.c
that are to do with pSeries-specific error logging are protected
by a new CONFIG_RTAS_ERROR_LOGGING symbol.  The inclusion of rtas.o
is controlled by the CONFIG_PPC_RTAS symbol, and the relevant
platforms select that.

Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/Kconfig

@@ -276,13 +276,16 @@ config PPC_PSERIES
 	depends on PPC_MULTIPLATFORM && PPC64
 	bool "  IBM pSeries & new (POWER5-based) iSeries"
 	select PPC_I8259
+	select PPC_RTAS
+	select RTAS_ERROR_LOGGING
 	default y
 
 config PPC_CHRP
 	bool "  Common Hardware Reference Platform (CHRP) based machines"
 	depends on PPC_MULTIPLATFORM && PPC32
 	select PPC_I8259
 	select PPC_INDIRECT_PCI
+	select PPC_RTAS
 	default y
 
 config PPC_PMAC
@@ -317,6 +320,7 @@ config PPC_MAPLE
 config PPC_BPA
 	bool "  Broadband Processor Architecture"
 	depends on PPC_MULTIPLATFORM && PPC64
+	select PPC_RTAS
 
 config PPC_OF
 	bool
@@ -338,6 +342,15 @@ config MPIC
 	bool
 	default y
 
+config PPC_RTAS
+	bool
+	default n
+
+config RTAS_ERROR_LOGGING
+	bool
+	depends on PPC_RTAS
+	default n
+
 config MPIC_BROKEN_U3
 	bool
 	depends on PPC_MAPLE

arch/powerpc/kernel/Makefile

@@ -16,6 +16,7 @@ obj-$(CONFIG_PPC64)		+= binfmt_elf32.o sys_ppc32.o ptrace32.o
 obj-$(CONFIG_ALTIVEC)		+= vecemu.o vector.o
 obj-$(CONFIG_POWER4)		+= idle_power4.o
 obj-$(CONFIG_PPC_OF)		+= of_device.o
+obj-$(CONFIG_PPC_RTAS)		+= rtas.o
 obj-$(CONFIG_IBMVIO)		+= vio.o
 
 ifeq ($(CONFIG_PPC_MERGE),y)

arch/powerpc/kernel/asm-offsets.c

@@ -36,11 +36,11 @@
 #include <asm/processor.h>
 #include <asm/cputable.h>
 #include <asm/thread_info.h>
+#include <asm/rtas.h>
 #ifdef CONFIG_PPC64
 #include <asm/paca.h>
 #include <asm/lppaca.h>
 #include <asm/iSeries/HvLpEvent.h>
-#include <asm/rtas.h>
 #include <asm/cache.h>
 #include <asm/systemcfg.h>
 #include <asm/compat.h>
@@ -97,7 +97,7 @@ int main(void)
 	DEFINE(TI_TASK, offsetof(struct thread_info, task));
 	DEFINE(TI_EXECDOMAIN, offsetof(struct thread_info, exec_domain));
 	DEFINE(TI_CPU, offsetof(struct thread_info, cpu));
-#endif /* CONFIG_PPC64 */
+#endif /* CONFIG_PPC32 */
 
 #ifdef CONFIG_PPC64
 	DEFINE(DCACHEL1LINESIZE, offsetof(struct ppc64_caches, dline_size));
@@ -142,11 +142,11 @@ int main(void)
 	DEFINE(LPPACASRR1, offsetof(struct lppaca, saved_srr1));
 	DEFINE(LPPACAANYINT, offsetof(struct lppaca, int_dword.any_int));
 	DEFINE(LPPACADECRINT, offsetof(struct lppaca, int_dword.fields.decr_int));
+#endif /* CONFIG_PPC64 */
 
 	/* RTAS */
 	DEFINE(RTASBASE, offsetof(struct rtas_t, base));
 	DEFINE(RTASENTRY, offsetof(struct rtas_t, entry));
-#endif /* CONFIG_PPC64 */
 
 	/* Interrupt register frame */
 	DEFINE(STACK_FRAME_OVERHEAD, STACK_FRAME_OVERHEAD);

arch/powerpc/kernel/entry_32.S

@@ -954,7 +954,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_601)
  * here so it's easy to add arch-specific sections later.
  * -- Cort
  */
-#ifdef CONFIG_PPC_OF
+#ifdef CONFIG_PPC_RTAS
 /*
  * On CHRP, the Run-Time Abstraction Services (RTAS) have to be
  * called with the MMU off.
@@ -963,22 +963,20 @@ _GLOBAL(enter_rtas)
 	stwu	r1,-INT_FRAME_SIZE(r1)
 	mflr	r0
 	stw	r0,INT_FRAME_SIZE+4(r1)
-	lis	r4,rtas_data@ha
-	lwz	r4,rtas_data@l(r4)
+	LOADADDR(r4, rtas)
 	lis	r6,1f@ha	/* physical return address for rtas */
 	addi	r6,r6,1f@l
 	tophys(r6,r6)
 	tophys(r7,r1)
-	lis	r8,rtas_entry@ha
-	lwz	r8,rtas_entry@l(r8)
+	lwz	r8,RTASENTRY(r4)
+	lwz	r4,RTASBASE(r4)
 	mfmsr	r9
 	stw	r9,8(r1)
 	LOAD_MSR_KERNEL(r0,MSR_KERNEL)
 	SYNC			/* disable interrupts so SRR0/1 */
 	MTMSRD(r0)		/* don't get trashed */
 	li	r9,MSR_KERNEL & ~(MSR_IR|MSR_DR)
 	mtlr	r6
-	CLR_TOP32(r7)
 	mtspr	SPRN_SPRG2,r7
 	mtspr	SPRN_SRR0,r8
 	mtspr	SPRN_SRR1,r9
@@ -999,4 +997,4 @@ machine_check_in_rtas:
 	twi	31,0,0
 	/* XXX load up BATs and panic */
 
-#endif /* CONFIG_PPC_OF */
+#endif /* CONFIG_PPC_RTAS */

arch/powerpc/kernel/prom.c

@@ -110,9 +110,6 @@ struct device_node *of_chosen;
 struct device_node *dflt_interrupt_controller;
 int num_interrupt_controllers;
 
-u32 rtas_data;
-u32 rtas_entry;
-
 /*
  * Wrapper for allocating memory for various data that needs to be
  * attached to device nodes as they are processed at boot or when