Commit Graph

157279 Commits

Author SHA1 Message Date
Paul Mundt ade315d83c sh: Kill off kgdb's magical NMI debouncing.
The kgdb stub has traditionally tied in to the NMI slot, and manually
handled debounce. Now that we have a generic way to do this instead, all
of the stub-specific debounce silliness can be killed off.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-09-01 17:45:35 +09:00
Paul Mundt 1e1030dccb sh: nmi_debug support.
This implements support for NMI debugging that was shamelessly copied
from the avr32 port. A bit of special magic is needed in the interrupt
exception path given that the NMI exception handler is stubbed in to the
regular exception handling table despite being reported in INTEVT. So we
mangle the lookup and kick off an EXPEVT-style exception dispatch from
the INTEVT path for exceptions that do_IRQ() has no chance of handling.
As a result, we also drop the evt2irq() conversion from the do_IRQ() path
and just do it in assembly.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-09-01 17:38:32 +09:00
Paul Mundt ac6a0cf671 Merge branch 'master' into sh/smp
Conflicts:
	arch/sh/mm/cache-sh4.c
2009-09-01 13:54:14 +09:00
Matt Fleming ce3f7cb96e sh: Fix dcache flushing for N-way write-through caches.
This adopts the special-cased 2-way write-through dcache flusher for
N-ways and moves it in to the generic path. Assignment is done at runtime
via the check for the CCR_CACHE_WT bit in the same path as the per-way
writeback flushers.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-09-01 13:32:48 +09:00
Paul Mundt 1279b7f116 sh: Fix up simplified multi-evt handling under sparseirq.
This fixes up the simplified multi-evt handling when sparseirq support is
enabled. While vectors are redirected through the single unique masking
source, each one of the redirected vectors still requires its own backing
irq_desc, which needs to be manually allocated in the sparseirq case.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-31 15:15:33 +09:00
Paul Mundt 2f6dafc5fc sh: unwinder: Fix up uninitialized variable warnings on sh2a build.
A couple of these popped up on the sh2a build, causing build failures.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-31 13:47:06 +09:00
Matt Fleming 4aa5ac4ef4 sh: Only shout about fixing up unexpected unaligned accesses
Some unaligned accesses are completely expected. For example, the
trapped_io code uses the unaligned access fixup code path so there's no
need to warn about having to fixup the unaligned access.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-29 20:31:44 +09:00
Yoshihiro Shimoda e79d57479c sh: sh7785lcr: fix prototype board on 32bit MMU mode.
Fix up PCA9564 resources on 32bit MMU mode using prototype board.

Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Tested-by: Raul Porcel <armin76@gentoo.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-28 10:19:13 +09:00
Paul Mundt f840dd5e74 sh: Tidy up watchdog build for SH-2.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-28 10:19:12 +09:00
Kuninori Morimoto ea15edb292 sh: Add LCDC Panel support for EcoVec24
Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-27 11:36:10 +09:00
Kuninori Morimoto 2153ad3294 sh: Add CEU support for EcoVec24
Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-27 11:36:10 +09:00
Kuninori Morimoto fa3ba51bcf sh: Add support LCDC for EcoVec24
Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-27 11:36:10 +09:00
Kuninori Morimoto 907050a33d sh: Add USB support for EcoVec24
Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-27 11:36:09 +09:00
Kuninori Morimoto 35a3540891 sh: Add SH-ETH support for EcoVec24
Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-27 11:36:09 +09:00
Kuninori Morimoto b7056bc194 sh: modify to enable boot for EcoVec24
Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-27 11:36:09 +09:00
Kuninori Morimoto b37c7c66f0 sh: fix CPU_SH7723/7724 numbering bug
Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-27 11:35:46 +09:00
Paul Mundt e76a0136a3 sh: Fix up sh4_flush_dcache_page() build on UP.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-27 11:31:16 +09:00
Paul Mundt c68e320686 sh: Fix an off-by-1 in FTRACE_SYSCALL_MAX.
This is supposed to be the equivalent of __NR_syscalls, not
__NR_syscalls -1. The x86 code this was based on had simply fallen
out of sync at the time this was implemented. Fix it up now.

As a result, tracing of __NR_perf_counter_open works as advertised.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-25 18:39:33 +09:00
Paul Mundt 12cceb6251 Merge branch 'sh/st-integration' 2009-08-24 22:49:17 +09:00
Paul Mundt f13327864f sh: Move the FTRACE_SYSCALL_MAX definition in to asm/ftrace.h.
Needed by ftrace changes in -tip.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 22:48:27 +09:00
Paul Mundt 56fd1260a8 usb: gadget: m66592-udc needs linux/err.h.
In certain configurations linux/err.h is not included through alternate
means, resulting in:

drivers/usb/gadget/m66592-udc.c:1646: error: implicit declaration of function 'IS_ERR'
drivers/usb/gadget/m66592-udc.c:1649: error: implicit declaration of function 'PTR_ERR'
distcc[15083] ERROR: compile drivers/usb/gadget/m66592-udc.c on localhost failed
make[3]: *** [drivers/usb/gadget/m66592-udc.o] Error 1
make[2]: *** [drivers/usb/gadget] Error 2
make[1]: *** [drivers] Error 2
make: *** [sub-make] Error 2

Caught with an ARM config in -next.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 22:45:15 +09:00
Pawel Moll 05ecd5a1f7 sh: Simplify "multi-evt" interrupt handling.
This patch changes the way in which "multi-evt" interrups are handled.
The intc_evt2irq_table and related intc_evt2irq() have been removed and
the "redirecting" handler is installed for the coupled interrupts.

Thanks to that the do_IRQ() function don't have to use another level
of indirection for all the interrupts...

Signed-off-by: Pawel Moll <pawel.moll@st.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 19:52:38 +09:00
Giuseppe Cavallaro 788e6af37a sh: fix sys_cacheflush error checking
sys_cacheflush should return with EINVAL if the cache parameter is not
one of ICACHE, DCACHE or BCACHE.
So, we need to include 0 in the first check.

It also adds the three definitions above as wrapper of the existent macros.

PS: ltp cacheflush01 test now passes.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 18:59:09 +09:00
Stuart Menefy ffad9d7a54 sh: Fix problems with cache flushing when cache is in write-through mode
Change the method used to flush the cache in write-through mode to
avoid corrupted data being written back to memory.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 18:39:39 +09:00
Stuart Menefy a1fce73235 sh: Fix overzealous checking in __ioremap()
Allow peripherals before the start of RAM to be remapped.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 18:29:25 +09:00
Stuart Menefy 6000fc4d6f sh: Fixes some write posting issues in the interrupt handling for SH
It is possible for the CPU to re-enable it's interrupt block bit
before the write to the interrupt controller has actually masked out
the external interupt at the controller. We get around this by
reading back from the interrupt controller which will ensure the
write has happened.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 18:27:33 +09:00
Stuart Menefy bd4fb4d4c1 sh: Fix underflow in SH udelay() code.
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 18:18:50 +09:00
Stuart Menefy 6d243dd370 sh: Add sys_cacheflush() call for SH CPUs.
Adds a system call to allow user code to flush code from the cache.
You can use instructions for the data side, but the iside can
only be done by a flush ROM which really only works with a direct
mapped cache. The later SH4's have 2 way Iside, so this call allows
a portable way to flush the cache.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 18:16:56 +09:00
Stuart Menefy a5cf9e2444 sh: Improve comments int SH4 cache flushing code
This is a pure documentation, to try to explain why the cache flushing code
for the SH4 is implemented the way it is.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 17:36:24 +09:00
Stuart Menefy 5e9377ec6f sh: Optimise memcpy_to/fromio for SH4
Optimise memcpy_to/fromio. This is used extensivly by MTD, so is a
worthwhile performance gain. The main savings come from not repeatedly
calling readl/writel, and doing word instead of byte at a time
transfers. Also using "movca.l" on SH4 gives a small performance win.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 17:35:07 +09:00
Stuart Menefy 8af57f8b4c sh: generic_in/outs{bwl} optimizations.
After performing the port2addr conversion, and checking that the data is
correctly aligned, simply call __raw_readsX/writesX. These have already been
optimised.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 17:26:39 +09:00
Stuart Menefy 7d9c035150 sh: Read from CCN_PVR instead of ROM for delay.
Reading from the ROM is not a good idea as it could disturb some
flash operation that it is in progress.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 17:13:52 +09:00
Stuart Menefy fea966f756 sh: Remove implicit sign extension from assembler immediates
The SH instruction set has several instructions which accept an 8 bit
immediate operand. For logical instructions this operand is zero extended,
for arithmetic instructions the operand is sign extended. After adding an
option to the assembler to check this, it was found that several pieces
of assembly code were assuming this behaviour, and in one case
getting it wrong.

So this patch explicitly sign extends any immediate operands, which makes
it obvious what is happening, and fixes the one case which got it wrong.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 17:09:53 +09:00
Pawel Moll d724a9c9d5 sh: Allow for kernel command line concatenation.
So far kernel command line arguments could be passed in by a bootloader
or defined as CONFIG_CMDLINE, which completely overwriting the first one.

This change allows a developer to declare selected kernel parameters in
a kernel configuration (eg. project-specific defconfig), retaining
possibility of passing others by a bootloader.

The obvious examples of the first type are MTD partition or
bigphysarea-like region definitions, while "debug" option or network
configuration should be given by a bootloader or a JTAG boot script.

Signed-off-by: Pawel Moll <pawel.moll@st.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 16:25:38 +09:00
Jon Frosdick b46373e0d4 sh: Use internal watchdog timer to perform reset
This patches will trigger a reboot using the watchdog
timer instead of double fault.  Unlike the previous
method, this one actually works in 32 bit mode.

Reset should also be cleaner.

Signed-off-by: Jon Frosdick <jon.frosdick@st.com>
Signed-off-by: Carl Shaw <carl.shaw@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 16:20:44 +09:00
Giuseppe Cavallaro 27a30f53bb sh: kgdb: do not reload VBR while handling debugger breackpoint
Save the VBR allowing GDB to dump full registers set but do not reload it
as soon as the kgdb_handle_exception is invoked.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 16:14:03 +09:00
David McKay 15444a8973 sh: Allow use of GENERIC_IOMAP
The synopsys PCI cell used in the later STMicro chips requires code to
be run in order to do IO cycles, rather than just memory mapping the IO
space. Rather than extending the existing SH infrastructure to allow
this, use the GENERIC_IOMAP implmentation to save re-inventing the
wheel.

This set of changes allows the SH to be built with GENERIC_IOMAP
enabled, it just ifdef's out the functions provided by the GENERIC_IOMAP
implementation, and provides a few required missing functions.

Signed-off-by: David McKay <david.mckay@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 16:10:40 +09:00
Carl Shaw 2fc742f8d6 sh: Improve unwind info for signals
GCC does not issue unwind information for function epilogues.
Unfortunately we can catch a signal during an epilogue.  The signal
handler writes the current context and signal return code onto the stack
overwriting previous contents.  During unwinding, libgcc can try to
restore registers from the stack and restores corrupted ones. This can
lead to segmentation, misaligned access and sigbus faults.

For example, consider the following code:

    mov.l   r12,@-r15
    mov.l   r14,@-r15
    sts.l   pr,@-r15
    mov     r15,r14

    <do stuff>

    mov r14, r15
    lds.l @r15+, pr
	<<< SIGNAL HERE
    mov.l @r15+, r14
    mov.l @r15+, r12
    rts

Unwind is aware that pr was pushed to stack in prolog, so tries to
restore it.  Unfortunately it restores the last word of the signal
handler code placed on the stack by the kernel.

This patch tries to avoid the problem by adding a guard region on the
stack between where the function pushes data and where the signal handler
pushes its return code.  We probably don't see this problem often because
exception handling unwinding in an epilogue only occurs due to a pthread
cancel signal.  Also the kernel signal stack handler alignment of 8 bytes
could hide the occurance of this problem sometimes as the stack may not
be trampled at a particular required word.

This is not guaranteed to always work.  It relies on a frame pointer
existing for the function (so it can get the correct sp value) which is
not always the case for the SH4.

Modifications will also be made to libgcc for the case where there is no
fp.

Signed-off-by: Carl Shaw <carl.shaw@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 15:07:08 +09:00
Andre Draszik 5a0ab35e43 sh: cleanup of do_address_error()
This patch fixes a few problems with the existing code in do_address_error().

a) the variable used to printk()d the offending instruction wasn't
   initialized correctly. This is a fix to bug 5727

b) behaviour for CONFIG_CPU_SH2A wasn't correct

c) the 'ignore address error' behaviour didn't update the PC, causing an
   infinite loop.

Signed-off-by: Andre Draszik <andre.draszik@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 15:01:10 +09:00
Andre Draszik 7436cde6b2 sh: Allow user control over misaligned fixup handling
This patch brings the SH4 misaligned trap handler in line with what
happens on ARM:
Add a /proc/cpu/alignment which can be read from to get alignment
trap statistics and written to to influence the behaviour of the
alignment trap handling. The value to write is a bitfield, which
has the following meaning: 1 warn, 2 fixup, 4 signal
In addition, we add a /proc/cpu/kernel_alignment, to enable or
disable warnings in case of kernel code causing alignment errors.

Signed-off by: Andre Draszik <andre.draszik@st.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 14:53:46 +09:00
Andre Draszik 9a4af027a0 sh: ratelimit unaligned fixups
This patch makes sure we see messages about unaligned access fixups
every now and then. Else especially userspace apps suffering from
bad programming won't ever be noticed...

Signed-off by: Andre Draszik <andre.draszik@st.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-24 14:38:27 +09:00
Paul Mundt c3144fc46f Merge branches 'sh/hwblk' and 'sh/pm-runtime' 2009-08-23 18:04:07 +09:00
Magnus Damm cc58f597af sh: drop static UIO clocks for sh7722, sh7723 and sh7724
The Runtime PM patch for UIO driver implements coarse grained
dynamic power management for UIO devices. With that patch in
place we can get rid of the static clock configuration. Which
in turn makes it possible for cpuidle to enter deeper sleep.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-23 18:03:21 +09:00
Magnus Damm ac2c596b57 sh: let ARCH_SHMOBILE select PM and PM_RUNTIME
With the Runtime PM driver changes in place, we must have
Runtime PM support in place. Otherwise there is no way to
enable clocks to the Runtime PM enabled hardware blocks.
This patch makes Runtime PM mandatory on SuperH Mobile.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-23 18:03:20 +09:00
Paul Mundt a62926fe4b sh: Fix section mismatch in platform bus notifier.
The runtime PM for SH-Mobile code had platform_bus_notify() as __devinit,
which is rather bogus. Kill off the annotation, which subsequently
silences the section mismatch warnings.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-23 18:03:20 +09:00
Magnus Damm af76756e6e uio: Runtime PM for UIO devices
This patch modifies the uio_pdrv_genirq driver to support
Runtime PM. The power management implementation simply
runtime resumes the device at open() time and runtime
suspends it at release() time. The user space driver is
responsible for re-initializing the hardware after open().

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-23 18:03:19 +09:00
Magnus Damm 6d1386c6b8 v4l2: Runtime PM for SuperH Mobile CEU
This patch modifies the SuperH Mobile CEU driver to support
Runtime PM. Driver callbacks for Runtime PM are empty because
the device registers are always re-initialized after
pm_runtime_get_sync(). The Runtime PM functions replaces the
clock framework module stop bit handling in this driver.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-23 18:03:19 +09:00
Magnus Damm 0246c4712c video: Runtime PM for SuperH Mobile LCDC
This patch modifies the SuperH Mobile LCDC framebuffer driver
to support Runtime PM. The driver is using the functions

 - pm_runtime_get_sync()
 - pm_runtime_put_sync()

to inform the bus code if the hardware is idle or not. If the
hardware is idle then the bus code may call the runtime dev_pm_ops
callbacks to save and restore state. pm_runtime_resume() is used
to allow the driver to access the hardware from probe().

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-23 18:03:19 +09:00
Magnus Damm f1a3b994f9 i2c: Runtime PM for SuperH Mobile I2C
This patch modifies the SuperH Mobile I2C driver to support
Runtime PM. These changes is all that is needed for proper
Runtime PM support in this driver. Driver callbacks for
Runtime PM are empty because the device registers are always
re-initialized after pm_runtime_get_sync().

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-23 18:03:19 +09:00
Magnus Damm 6a93dde1e8 sh: Runtime PM for SuperH Mobile platform bus devices
This patch is V3 of the SuperH Mobile Runtime PM platform bus
implentation matching Rafael's Runtime PM v16.

The code gets invoked from the SuperH specific Runtime PM
platform bus functions that override the weak symbols for:
 - platform_pm_runtime_suspend()
 - platform_pm_runtime_resume()
 - platform_pm_runtime_idle()

This Runtime PM implementation performs two levels of power
management. At the time of platform bus runtime suspend the
clock to the device is stopped instantly. Later on if all
devices within the power domain has their clocks stopped
then the device driver ->runtime_suspend() callbacks are
used to save hardware register state for each device.

Device driver ->runtime_suspend() calls are scheduled from
cpuidle context using platform_pm_runtime_suspend_idle().
When all devices have been fully suspended the processor
is allowed to enter deep sleep from cpuidle.

The runtime resume operation turns on clocks and also
restores registers if needed. It is worth noting that the
devices start in a suspended state and the device driver
is responsible for calling runtime resume before accessing
the actual hardware.

In this particular platform bus implementation runtime
resume is not allowed from interrupt context. Runtime
suspend is however allowed from interrupt context as
long as the synchronous functions are avoided.

[ updated for v17 -- PFM. ]

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-08-23 18:03:17 +09:00