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scsi/atari_scsi: Don't select CONFIG_NVRAM 

On powerpc, setting CONFIG_NVRAM=n builds a kernel with no NVRAM support.
Setting CONFIG_NVRAM=m enables the /dev/nvram misc device module without
enabling NVRAM support in drivers. Setting CONFIG_NVRAM=y enables the
misc device (built-in) and also enables NVRAM support in drivers.

m68k shares the valkyriefb driver with powerpc, and since that driver uses
NVRAM, it is affected by CONFIG_ATARI_SCSI, because of the use of
"select NVRAM". We can avoid the "select" here, but drivers still have
to interpret the CONFIG_NVRAM symbol consistently regardless of platform.

In this patch and the subsequent fbdev driver patch, the convention is
adopted across all relevant platforms whereby NVRAM functionality gets
enabled in a given device driver when the nvram misc device is built-in
or when both drivers are modules.

Acked-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Finn Thain 2019-01-15 15:18:56 +11:00 committed by Greg Kroah-Hartman
parent e3575c1201
commit 83d2aed444
3 changed files with 5 additions and 8 deletions
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5
drivers/char/Kconfig
View File

@ -244,7 +244,7 @@ source "drivers/char/hw_random/Kconfig"
config NVRAM
tristate "/dev/nvram support"
depends on ATARI || X86 || GENERIC_NVRAM
depends on X86 || GENERIC_NVRAM
---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"),
@ -262,9 +262,6 @@ config NVRAM
should NEVER idly tamper with it. See Ralf Brown's interrupt list
for a guide to the use of CMOS bytes by your BIOS.
On Atari machines, /dev/nvram is always configured and does not need
to be selected.
To compile this driver as a module, choose M here: the
module will be called nvram.

6
drivers/scsi/Kconfig
View File

@ -1369,14 +1369,14 @@ config ATARI_SCSI
tristate "Atari native SCSI support"
depends on ATARI && SCSI
select SCSI_SPI_ATTRS
select NVRAM
---help---
If you have an Atari with built-in NCR5380 SCSI controller (TT,
Falcon, ...) say Y to get it supported. Of course also, if you have
a compatible SCSI controller (e.g. for Medusa).
To compile this driver as a module, choose M here: the
module will be called atari_scsi.
To compile this driver as a module, choose M here: the module will
be called atari_scsi. If you also enable NVRAM support, the SCSI
host's ID is taken from the setting in TT RTC NVRAM.
This driver supports both styles of NCR integration into the
system: the TT style (separate DMA), and the Falcon style (via

2
drivers/scsi/atari_scsi.c
View File

@ -757,7 +757,7 @@ static int __init atari_scsi_probe(struct platform_device *pdev)
if (setup_hostid >= 0) {
atari_scsi_template.this_id = setup_hostid & 7;
} else {
} else if (IS_REACHABLE(CONFIG_NVRAM)) {
/* Test if a host id is set in the NVRam */
if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) {
unsigned char b = nvram_read_byte(16);