powerpc/machdep: Remove stale functions from ppc_md structure

ppc_md.iommu_save() is not set anymore by any platform after
commit c40785ad305b ("powerpc/dart: Use a cachable DART").
So iommu_save() has become a nop and can be removed.

ppc_md.show_percpuinfo() is not set anymore by any platform after
commit 4350147a816b ("[PATCH] ppc64: SMU based macs cpufreq support").

Last users of ppc_md.rtc_read_val() and ppc_md.rtc_write_val() were
removed by commit 0f03a43b8f0f ("[POWERPC] Remove todc code from
ARCH=powerpc")

Last user of kgdb_map_scc() was removed by commit 17ce452f7ea3 ("kgdb,
powerpc: arch specific powerpc kgdb support").

ppc.machine_kexec_prepare() has not been used since
commit 8ee3e0d69623 ("powerpc: Remove the main legacy iSerie platform
code"). This allows the removal of machine_kexec_prepare() and the
rename of default_machine_kexec_prepare() into machine_kexec_prepare()

Signed-off-by: Christophe Leroy <[e-mail]>
Reviewed-by: Daniel Axtens <[e-mail]>
[mpe: Drop prototype for default_machine_kexec_prepare() as noted by dja]
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://lore.kernel.org/r/24d4ca0a[e-mail]

arch/powerpc/include/asm/iommu.h

···
 extern void iommu_init_early_pasemi(void);
 
 #if defined(CONFIG_PPC64) && defined(CONFIG_PM)
-static inline void iommu_save(void)
-{
-	if (ppc_md.iommu_save)
-		ppc_md.iommu_save();
-}
-
 static inline void iommu_restore(void)
 {
 	if (ppc_md.iommu_restore)

arch/powerpc/include/asm/kexec.h

···
 struct kimage;
 struct pt_regs;
 extern void default_machine_kexec(struct kimage *image);
-extern int default_machine_kexec_prepare(struct kimage *image);
 extern void default_machine_crash_shutdown(struct pt_regs *regs);
 extern int crash_shutdown_register(crash_shutdown_t handler);
 extern int crash_shutdown_unregister(crash_shutdown_t handler);

arch/powerpc/include/asm/machdep.h

···
 	char		*name;
 #ifdef CONFIG_PPC64
 #ifdef CONFIG_PM
-	void		(*iommu_save)(void);
 	void		(*iommu_restore)(void);
 #endif
 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
···
 	void		(*setup_arch)(void); /* Optional, may be NULL */
 	/* Optional, may be NULL. */
 	void		(*show_cpuinfo)(struct seq_file *m);
-	void		(*show_percpuinfo)(struct seq_file *m, int i);
 	/* Returns the current operating frequency of "cpu" in Hz */
 	unsigned long  	(*get_proc_freq)(unsigned int cpu);
 
···
 	int		(*set_rtc_time)(struct rtc_time *);
 	void		(*get_rtc_time)(struct rtc_time *);
 	time64_t	(*get_boot_time)(void);
-	unsigned char 	(*rtc_read_val)(int addr);
-	void		(*rtc_write_val)(int addr, unsigned char val);
 
 	void		(*calibrate_decr)(void);
 
···
 	   May be NULL. */
 	void		(*init)(void);
 
-	void		(*kgdb_map_scc)(void);
-
 	/*
 	 * optional PCI "hooks"
 	 */
···
 
 #ifdef CONFIG_KEXEC_CORE
 	void (*kexec_cpu_down)(int crash_shutdown, int secondary);
-
-	/* Called to do what every setup is needed on image and the
-	 * reboot code buffer. Returns 0 on success.
-	 * Provide your own (maybe dummy) implementation if your platform
-	 * claims to support kexec.
-	 */
-	int (*machine_kexec_prepare)(struct kimage *image);
 
 	/* Called to perform the _real_ kexec.
 	 * Do NOT allocate memory or fail here. We are past the point of

arch/powerpc/kernel/setup-common.c

···
 		seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 			   proc_freq / 1000000, proc_freq % 1000000);
 
-	if (ppc_md.show_percpuinfo != NULL)
-		ppc_md.show_percpuinfo(m, cpu_id);
-
 	/* If we are a Freescale core do a simple check so
 	 * we dont have to keep adding cases in the future */
 	if (PVR_VER(pvr) & 0x8000) {

arch/powerpc/kernel/swsusp_64.c

···
 	touch_softlockup_watchdog();
 	mb();
 }
-
-void _iommu_save(void)
-{
-	iommu_save();
-}

arch/powerpc/kernel/swsusp_asm64.S

···
 	 * stack pointer on the stack like a real stackframe */
 	addi	r1,r1,-128
 
-	bl _iommu_save
 	bl swsusp_save
 
 	/* restore LR */

arch/powerpc/kexec/core.c

···
 	default_machine_crash_shutdown(regs);
 }
 
-/*
- * Do what every setup is needed on image and the
- * reboot code buffer to allow us to avoid allocations
- * later.
- */
-int machine_kexec_prepare(struct kimage *image)
-{
-	if (ppc_md.machine_kexec_prepare)
-		return ppc_md.machine_kexec_prepare(image);
-	else
-		return default_machine_kexec_prepare(image);
-}
-
 void machine_kexec_cleanup(struct kimage *image)
 {
 }

arch/powerpc/kexec/core_32.c

···
 	(*rnk)(page_list, reboot_code_buffer_phys, image->start);
 }
 
-int default_machine_kexec_prepare(struct kimage *image)
+int machine_kexec_prepare(struct kimage *image)
 {
 	return 0;
 }

arch/powerpc/kexec/core_64.c

···
 #include <asm/svm.h>
 #include <asm/ultravisor.h>
 
-int default_machine_kexec_prepare(struct kimage *image)
+int machine_kexec_prepare(struct kimage *image)
 {
 	int i;
 	unsigned long begin, end;	/* limits of segment */