powerpc: Enable HAVE_ARCH_NVRAM_OPS and disable GENERIC_NVRAM

Switch PPC32 kernels from the generic_nvram module to the nvram module.

Also fix a theoretical bug where CHRP omits the chrp_nvram_init() call
when CONFIG_NVRAM_MODULE=m.

Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 2890d36..f62e6a3 100644 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -178,6 +178,7 @@ config PPC
        select HAVE_ARCH_KGDB
        select HAVE_ARCH_MMAP_RND_BITS
        select HAVE_ARCH_MMAP_RND_COMPAT_BITS   if COMPAT
+       select HAVE_ARCH_NVRAM_OPS              if PPC32
        select HAVE_ARCH_SECCOMP_FILTER
        select HAVE_ARCH_TRACEHOOK
        select HAVE_CBPF_JIT                    if !PPC64
@@ -274,11 +275,6 @@ config SYSVIPC_COMPAT
        depends on COMPAT && SYSVIPC
        default y
 
-# All PPC32s use generic nvram driver through ppc_md
-config GENERIC_NVRAM
-       bool
-       default y if PPC32
-
 config SCHED_OMIT_FRAME_POINTER
        bool
        default y

diff --git a/arch/powerpc/include/asm/nvram.h b/arch/powerpc/include/asm/nvram.h
index 56a388d..629a5cd 100644 (file)
--- a/arch/powerpc/include/asm/nvram.h
+++ b/arch/powerpc/include/asm/nvram.h
@@ -78,9 +78,6 @@ extern int    pmac_get_partition(int partition);
 extern u8      pmac_xpram_read(int xpaddr);
 extern void    pmac_xpram_write(int xpaddr, u8 data);
 
-/* Synchronize NVRAM */
-extern void    nvram_sync(void);
-
 /* Initialize NVRAM OS partition */
 extern int __init nvram_init_os_partition(struct nvram_os_partition *part);
 

diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index f510779..c310822 100644 (file)
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -148,17 +148,6 @@ static int __init ppc_setup_l3cr(char *str)
 }
 __setup("l3cr=", ppc_setup_l3cr);
 
-#ifdef CONFIG_GENERIC_NVRAM
-
-void nvram_sync(void)
-{
-       if (ppc_md.nvram_sync)
-               ppc_md.nvram_sync();
-}
-EXPORT_SYMBOL(nvram_sync);
-
-#endif /* CONFIG_NVRAM */
-
 static int __init ppc_init(void)
 {
        /* clear the progress line */

diff --git a/arch/powerpc/platforms/chrp/Makefile b/arch/powerpc/platforms/chrp/Makefile
index 4b3bfad..dc3465c 100644 (file)
--- a/arch/powerpc/platforms/chrp/Makefile
+++ b/arch/powerpc/platforms/chrp/Makefile
@@ -1,3 +1,3 @@
 obj-y                          += setup.o time.o pegasos_eth.o pci.o
 obj-$(CONFIG_SMP)              += smp.o
-obj-$(CONFIG_NVRAM)            += nvram.o
+obj-$(CONFIG_NVRAM:m=y)                += nvram.o

diff --git a/arch/powerpc/platforms/chrp/setup.c b/arch/powerpc/platforms/chrp/setup.c
index e66644e..e8e8042 100644 (file)
--- a/arch/powerpc/platforms/chrp/setup.c
+++ b/arch/powerpc/platforms/chrp/setup.c
@@ -550,7 +550,7 @@ static void __init chrp_init_IRQ(void)
 static void __init
 chrp_init2(void)
 {
-#ifdef CONFIG_NVRAM
+#if IS_ENABLED(CONFIG_NVRAM)
        chrp_nvram_init();
 #endif
 

diff --git a/arch/powerpc/platforms/powermac/setup.c b/arch/powerpc/platforms/powermac/setup.c
index 2e8221e..b47f49c 100644 (file)
--- a/arch/powerpc/platforms/powermac/setup.c
+++ b/arch/powerpc/platforms/powermac/setup.c
@@ -316,8 +316,7 @@ static void __init pmac_setup_arch(void)
        find_via_pmu();
        smu_init();
 
-#if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
-    defined(CONFIG_PPC64)
+#if IS_ENABLED(CONFIG_NVRAM) || defined(CONFIG_PPC64)
        pmac_nvram_init();
 #endif
 #ifdef CONFIG_PPC32

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index ce99795..72866a0 100644 (file)
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -244,25 +244,24 @@ source "drivers/char/hw_random/Kconfig"
 
 config NVRAM
        tristate "/dev/nvram support"
-       depends on X86 || GENERIC_NVRAM || HAVE_ARCH_NVRAM_OPS
-       default M68K
+       depends on X86 || HAVE_ARCH_NVRAM_OPS
+       default M68K || PPC
        ---help---
          If you say Y here and create a character special file /dev/nvram
          with major number 10 and minor number 144 using mknod ("man mknod"),
-         you get read and write access to the extra bytes of non-volatile
-         memory in the real time clock (RTC), which is contained in every PC
-         and most Ataris.  The actual number of bytes varies, depending on the
-         nvram in the system, but is usually 114 (128-14 for the RTC).
-
-         This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
-         on Ataris. /dev/nvram may be used to view settings there, or to
-         change them (with some utility). It could also be used to frequently
+         you get read and write access to the non-volatile memory.
+
+         /dev/nvram may be used to view settings in NVRAM or to change them
+         (with some utility). It could also be used to frequently
          save a few bits of very important data that may not be lost over
          power-off and for which writing to disk is too insecure. Note
          however that most NVRAM space in a PC belongs to the BIOS and you
          should NEVER idly tamper with it. See Ralf Brown's interrupt list
          for a guide to the use of CMOS bytes by your BIOS.
 
+         This memory is conventionally called "NVRAM" on PowerPC machines,
+         "CMOS RAM" on PCs, "NVRAM" on Ataris and "PRAM" on Macintoshes.
+
          To compile this driver as a module, choose M here: the
          module will be called nvram.
 

diff --git a/include/linux/nvram.h b/include/linux/nvram.h
index 9e3a957..d29d9c9 100644 (file)
--- a/include/linux/nvram.h
+++ b/include/linux/nvram.h
@@ -5,6 +5,10 @@
 #include <linux/errno.h>
 #include <uapi/linux/nvram.h>
 
+#ifdef CONFIG_PPC
+#include <asm/machdep.h>
+#endif
+
 /**
  * struct nvram_ops - NVRAM functionality made available to drivers
  * @read: validate checksum (if any) then load a range of bytes from NVRAM
@@ -42,6 +46,8 @@ extern const struct nvram_ops arch_nvram_ops;
 static inline ssize_t nvram_get_size(void)
 {
 #ifdef CONFIG_PPC
+       if (ppc_md.nvram_size)
+               return ppc_md.nvram_size();
 #else
        if (arch_nvram_ops.get_size)
                return arch_nvram_ops.get_size();
@@ -52,6 +58,8 @@ static inline ssize_t nvram_get_size(void)
 static inline unsigned char nvram_read_byte(int addr)
 {
 #ifdef CONFIG_PPC
+       if (ppc_md.nvram_read_val)
+               return ppc_md.nvram_read_val(addr);
 #else
        if (arch_nvram_ops.read_byte)
                return arch_nvram_ops.read_byte(addr);
@@ -62,6 +70,8 @@ static inline unsigned char nvram_read_byte(int addr)
 static inline void nvram_write_byte(unsigned char val, int addr)
 {
 #ifdef CONFIG_PPC
+       if (ppc_md.nvram_write_val)
+               ppc_md.nvram_write_val(addr, val);
 #else
        if (arch_nvram_ops.write_byte)
                arch_nvram_ops.write_byte(val, addr);
@@ -98,15 +108,25 @@ static inline ssize_t nvram_write_bytes(char *buf, size_t count, loff_t *ppos)
 
 static inline ssize_t nvram_read(char *buf, size_t count, loff_t *ppos)
 {
+#ifdef CONFIG_PPC
+       if (ppc_md.nvram_read)
+               return ppc_md.nvram_read(buf, count, ppos);
+#else
        if (arch_nvram_ops.read)
                return arch_nvram_ops.read(buf, count, ppos);
+#endif
        return nvram_read_bytes(buf, count, ppos);
 }
 
 static inline ssize_t nvram_write(char *buf, size_t count, loff_t *ppos)
 {
+#ifdef CONFIG_PPC
+       if (ppc_md.nvram_write)
+               return ppc_md.nvram_write(buf, count, ppos);
+#else
        if (arch_nvram_ops.write)
                return arch_nvram_ops.write(buf, count, ppos);
+#endif
        return nvram_write_bytes(buf, count, ppos);
 }