powerpc: Untangle fixmap.h and pgtable.h and mmu.h

fixmap.h need pgtable.h for [un]map_kernel_page()

pgtable.h need fixmap.h for FIXADDR_TOP.

Untangle the two files by moving FIXADDR_TOP into pgtable.h

Also move VIRT_IMMR_BASE to fixmap.h to avoid fixmap.h in mmu.h

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/5eba12392a018be28ad0a02ed844767b132589e7.1695659959.git.christophe.leroy@csgroup.eu

powerpc/8xx: Remove immr_map() and immr_unmap()

Since commit fb533d0c5a97 ("[POWERPC] 8xx: Infrastructure code cleanup.")
immr_map() is just returning mpc8xxx_immr pointer and immr_unmap()
do nothing.

We already have parts of code that use mpc8xxx_immr directly so get rid
of immr_map() and immr_unmap() by using mpc8xxx_immr directly. And avoid
going through local pointers that hide the pointed structure.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/633ed46f6015ff44d5599258647ea517f75d6a1d.1691474658.git.christophe.leroy@csgroup.eu

powerpc/8xx: Use a larger CPM1 command check mask

The CPM1 command mask is defined for use with the standard
CPM1 command register as described in the user's manual:
0 |1 3|4 7|8 11|12 14| 15|
RST| - |OPCODE|CH_NUM| - |FLG|

In the QMC extension the CPM1 command register is redefined
(QMC supplement user's manuel) with the following mapping:
0 |1 3|4 7|8 13|14| 15|
RST|QMC OPCODE| 1110|CHANNEL_NUMBER| -|FLG|

Extend the check command mask in order to support both the
standard CH_NUM field and the QMC extension CHANNEL_NUMBER
field.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Acked-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230217145645.1768659-5-herve.codina@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>

gpiolib: split of_mm_gpio_chip out of linux/of_gpio.h

This is a rarely used feature that has nothing to do with the
client-side of_gpio.h.

Split it out with a separate header file and Kconfig option
so it can be removed on its own timeline aside from removing
the of_gpio consumer interfaces.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

powerpc/8xx: Move CPM interrupt controller into a dedicated file

CPM interrupt controller is quite standalone. Move it into a
dedicated file. It will help for next step which will change
it to a platform driver.

This is pure code move, checkpatch report is ignored at this point,
except one parenthesis alignment which would remain at the end of
the series. All other points fly away with following patches.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/d3a7dc832d905bed14b35d83410cdb69a7ba20e8.1649226186.git.christophe.leroy@csgroup.eu

powerpc: Add missing headers

Don't inherit headers "by chances" from asm/prom.h, asm/mpc52xx.h,
asm/pci.h etc...

Include the needed headers, and remove asm/prom.h when it was
needed exclusively for pulling necessary headers.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/be8bdc934d152a7d8ee8d1a840d5596e2f7d85e0.1646767214.git.christophe.leroy@csgroup.eu

powerpc/8xx: export 'cpm_setbrg' for modules

Fix missing export for a loadable module build:

ERROR: modpost: "cpm_setbrg" [drivers/tty/serial/cpm_uart/cpm_uart.ko] undefined!

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
[chleroy: Changed Fixes: tag]
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210122010819.30986-1-rdunlap@infradead.org

mm: don't include asm/pgtable.h if linux/mm.h is already included

Patch series "mm: consolidate definitions of page table accessors", v2.

The low level page table accessors (pXY_index(), pXY_offset()) are
duplicated across all architectures and sometimes more than once. For
instance, we have 31 definition of pgd_offset() for 25 supported
architectures.

Most of these definitions are actually identical and typically it boils
down to, e.g.

static inline unsigned long pmd_index(unsigned long address)
{
return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
}

static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
{
return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
}

These definitions can be shared among 90% of the arches provided
XYZ_SHIFT, PTRS_PER_XYZ and xyz_page_vaddr() are defined.

For architectures that really need a custom version there is always
possibility to override the generic version with the usual ifdefs magic.

These patches introduce include/linux/pgtable.h that replaces
include/asm-generic/pgtable.h and add the definitions of the page table
accessors to the new header.

This patch (of 12):

The linux/mm.h header includes <asm/pgtable.h> to allow inlining of the
functions involving page table manipulations, e.g. pte_alloc() and
pmd_alloc(). So, there is no point to explicitly include <asm/pgtable.h>
in the files that include <linux/mm.h>.

The include statements in such cases are remove with a simple loop:

for f in $(git grep -l "include <linux/mm.h>") ; do
sed -i -e '/include <asm\/pgtable.h>/ d' $f
done

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Cain <bcain@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: http://lkml.kernel.org/r/20200514170327.31389-1-rppt@kernel.org
Link: http://lkml.kernel.org/r/20200514170327.31389-2-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

powerpc: Replace setup_irq() by request_irq()

request_irq() is preferred over setup_irq(). Invocations of setup_irq()
occur after memory allocators are ready.

Per tglx[1], setup_irq() existed in olden days when allocators were not
ready by the time early interrupts were initialized.

Hence replace setup_irq() by request_irq().

[1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos

Signed-off-by: afzal mohammed <afzal.mohd.ma@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200312064256.18735-1-afzal.mohd.ma@gmail.com

powerpc/8xx: use the fixmapped IMMR in cpm_reset()

Since commit f86ef74ed919 ("powerpc/8xx: Fix vaddr for IMMR early
remap"), the IMMR area has been mapped at startup with fixmap.

Use that fixmap directly instead of calling ioremap(), this
avoids calling ioremap() early before the slab is available.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/f816ccdbd15b97cf43c5a8c7cc8dfa8db58ff036.1568294935.git.christophe.leroy@c-s.fr

powerpc/8xx: add __init to cpm1 init functions

Functions cpm1_clk_setup(), cpm1_set_pin(), cpm_pic_init() and
mpc8xx_pic_init() are only called from __init functions, so mark
them __init as well.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c27168ef054f3a52edcf0ff91652700d53b3e32d.1568294563.git.christophe.leroy@c-s.fr

powerpc/8xx: move CPM1 related files from sysdev/ to platforms/8xx

Only 8xx selects CPM1 and related CONFIG options are already
in platforms/8xx/Kconfig

Move the related C files to platforms/8xx/.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: Minor formatting fixes]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>