powerpc/powernv: Create LED platform device

This patch adds platform devices for leds. Also export LED related
OPAL API's so that led driver can use these APIs.

Signed-off-by: Vasant Hegde <hegdeva

powerpc/powernv: Create LED platform device

This patch adds platform devices for leds. Also export LED related
OPAL API's so that led driver can use these APIs.

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: Invoke opal_cec_reboot2() on unrecoverable machine check errors.

On non-recoverable MCE errors in kernel space, Linux kernel panics
and system reboots. On BMC based system opal-prd

powerpc/powernv: Invoke opal_cec_reboot2() on unrecoverable machine check errors.

On non-recoverable MCE errors in kernel space, Linux kernel panics
and system reboots. On BMC based system opal-prd runs as a daemon
in the host. Hence, kernel crash may prevent opal-prd to detect and
analyze this MCE error. This may land us in a situation where the faulty
memory never gets de-configured and Linux would keep hitting same MCE error
again and again. If this happens in early stage of kernel initialization,
then Linux will keep crashing and rebooting in a loop.

This patch fixes this issue by invoking new opal_cec_reboot2() call with
reboot type OPAL_REBOOT_PLATFORM_ERROR to inform BMC/OCC about this
error, so that BMC can collect relevant data for error analysis and
decide what component to de-configure before rebooting.

This patch is dependent on OPAL patchset posted on skiboot mailing list
at https://lists.ozlabs.org/pipermail/skiboot/2015-July/001771.html that
introduces opal_cec_reboot2() opal call.

Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: Increase opal-irqchip initcall priority

The eeh subsystem for powernv requires the opal event irqchip to be
initialised prior to initialisation or the following errors are
produced

powerpc/powernv: Increase opal-irqchip initcall priority

The eeh subsystem for powernv requires the opal event irqchip to be
initialised prior to initialisation or the following errors are
produced (and eeh doesn't work as expected):

irq: XICS didn't like hwirq-0x9 to VIRQ17 mapping (rc=-22)
pnv_eeh_post_init: Can't request OPAL event interrupt (0)

On powernv eeh is initialised from a subsys_initcall due to a check
for machine_is(powernv) in eeh_init(). This patch increases the
initcall priority of opal_event_init() to an arch_initcall to ensure
the opal event interface is initialised prior to any users of it.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Reported-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: Add opal-prd channel

This change adds a char device to access the "PRD" (processor runtime
diagnostics) channel to OPAL firmware.

Includes contributions from Vaidyanathan Srinivasa

powerpc/powernv: Add opal-prd channel

This change adds a char device to access the "PRD" (processor runtime
diagnostics) channel to OPAL firmware.

Includes contributions from Vaidyanathan Srinivasan, Neelesh Gupta &
Vishal Kulkarni.

Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Acked-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: Expose OPAL APIs required by PRD interface

The (upcoming) opal-prd driver needs to access the message notifier and
xscom code, so add EXPORT_SYMBOL_GPL macros for these.

Signed-off

powerpc/powernv: Expose OPAL APIs required by PRD interface

The (upcoming) opal-prd driver needs to access the message notifier and
xscom code, so add EXPORT_SYMBOL_GPL macros for these.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: Merge common platform device initialisation

opal_ipmi_init and opal_flash_init are equivalent, except for the
compatbile string. Merge these two into a common opal_pdev_init
functio

powerpc/powernv: Merge common platform device initialisation

opal_ipmi_init and opal_flash_init are equivalent, except for the
compatbile string. Merge these two into a common opal_pdev_init
function.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: convert OPAL codes returned by sysparam calls

The opal_{get,set}_param calls return internal error codes which need
to be translated in errnos in Linux.

Signed-off-by: Cédric Le Go

powerpc/powernv: convert OPAL codes returned by sysparam calls

The opal_{get,set}_param calls return internal error codes which need
to be translated in errnos in Linux.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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opal: Remove events notifier

All users of the old opal events notifier have been converted over to
the irq domain so remove the event notifier functions.

Signed-off-by: Alistair Popple <alistair@po

opal: Remove events notifier

All users of the old opal events notifier have been converted over to
the irq domain so remove the event notifier functions.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powernv/opal: Convert opal message events to opal irq domain

This patch converts the opal message event to use the new opal irq
domain.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed

powernv/opal: Convert opal message events to opal irq domain

This patch converts the opal message event to use the new opal irq
domain.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: Add a virtual irqchip for opal events

Whenever an interrupt is received for opal the linux kernel gets a
bitfield indicating certain events that have occurred and need handling
by t

powerpc/powernv: Add a virtual irqchip for opal events

Whenever an interrupt is received for opal the linux kernel gets a
bitfield indicating certain events that have occurred and need handling
by the various device drivers. Currently this is handled using a
notifier interface where we call every device driver that has
registered to receive opal events.

This approach has several drawbacks. For example each driver has to do
its own checking to see if the event is relevant as well as event
masking. There is also no easy method of recording the number of times
we receive particular events.

This patch solves these issues by exposing opal events via the
standard interrupt APIs by adding a new interrupt chip and
domain. Drivers can then register for the appropriate events using
standard kernel calls such as irq_of_parse_and_map().

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: Reorder OPAL subsystem initialisation

Most of the OPAL subsystems are always compiled in for PowerNV and
many of them need to be initialised before or after other OPAL
subsystems. R

powerpc/powernv: Reorder OPAL subsystem initialisation

Most of the OPAL subsystems are always compiled in for PowerNV and
many of them need to be initialised before or after other OPAL
subsystems. Rather than trying to control this ordering through
machine initcalls it is clearer and easier to control initialisation
order with explicit calls in opal_init.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Cc: Mahesh Jagannath Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: Add interfaces for flash device access

This change adds the OPAL interface definitions to allow Linux to read,
write and erase from system flash devices. We register platform device

powerpc/powernv: Add interfaces for flash device access

This change adds the OPAL interface definitions to allow Linux to read,
write and erase from system flash devices. We register platform devices
for the flash devices exported by firmware.

We clash with the existing opal_flash_init function, which is really for
the FSP flash update functionality, so we rename that initcall to
opal_flash_update_init().

A future change will add an mtd driver that uses this interface.

Changes from Joel Stanley and Jeremy Kerr.

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Acked-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: convert codes returned by OPAL calls

OPAL has its own list of return codes. The patch provides a translation
of such codes in errnos for the opal_sensor_read call, and possibly
othe

powerpc/powernv: convert codes returned by OPAL calls

OPAL has its own list of return codes. The patch provides a translation
of such codes in errnos for the opal_sensor_read call, and possibly
others if needed.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: Add OPAL message notifier unregister function

Provide an unregister interface for the opal message notifiers
to be called when not needed like during driver unload/remove.

Signed-o

powerpc/powernv: Add OPAL message notifier unregister function

Provide an unregister interface for the opal message notifiers
to be called when not needed like during driver unload/remove.

Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com>
Reviewed-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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powerpc/powernv: Fix the overflow of OPAL message notifiers head array

Fixes the condition check of incoming message type which can
otherwise shoot beyond the message notifiers head array.

Signed-o

powerpc/powernv: Fix the overflow of OPAL message notifiers head array

Fixes the condition check of incoming message type which can
otherwise shoot beyond the message notifiers head array.

Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com>
Reviewed-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Reviewed-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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powerpc/powernv: Support OPAL requested heartbeat

If OPAL requests it, call it back via opal_poll_events() at a
regular interval. Some versions of OPAL on some machines require
this to operate some

powerpc/powernv: Support OPAL requested heartbeat

If OPAL requests it, call it back via opal_poll_events() at a
regular interval. Some versions of OPAL on some machines require
this to operate some internal timeouts properly.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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powerpc/powernv: Move opal-api.h closer to the Skiboot version

This commit gets opal-api.h to mostly match the version in Skiboot as of
commit ea7d806ab0ba.

The exceptions are things which are not

powerpc/powernv: Move opal-api.h closer to the Skiboot version

This commit gets opal-api.h to mostly match the version in Skiboot as of
commit ea7d806ab0ba.

The exceptions are things which are not (currently) used in Linux.

Most of this is just whitespace and a few things moving around. I think
the diff is readable.

Also OpalMessageType became opal_msg_type, requiring a change in the
Linux code.

Finally Skiboot and Linux disagree on CAPI vs CXL, because CAPI means
something else in Linux. To handle that we just point the Linux wrapper,
which is named "cxl" to the OPAL token OPAL_PCI_SET_PHB_CAPI_MODE.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Stewart Smith <stewart@linux.vnet.ibm.com>

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powerpc/powernv: only register log if OPAL supports doing so

Correct use of REGISTER/UNREGISTER is to check if the token exists
before calling. If we don't we get a "OPAL: Called with bad token 101

powerpc/powernv: only register log if OPAL supports doing so

Correct use of REGISTER/UNREGISTER is to check if the token exists
before calling. If we don't we get a "OPAL: Called with bad token 101 !"
error, which is harmless but may be alarming to some.

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Acked-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: Don't alloc IRQ map if necessary

On PowerNV platform, the OPAL interrupts are exported by firmware
through device-node property (/ibm,opal::opal-interrupts). Under
some extreme circ

powerpc/powernv: Don't alloc IRQ map if necessary

On PowerNV platform, the OPAL interrupts are exported by firmware
through device-node property (/ibm,opal::opal-interrupts). Under
some extreme circumstances (e.g. simulator), we don't have this
property found from the device tree. For that case, we shouldn't
allocate the interrupt map. Otherwise, slab complains allocating
zero sized memory chunk.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: Separate function for OPAL IRQ setup

The patch put the OPAL interrupt setup logic in opal_init() into
seperate function opal_irq_init() for easier code maintaining. The
patch doesn'

powerpc/powernv: Separate function for OPAL IRQ setup

The patch put the OPAL interrupt setup logic in opal_init() into
seperate function opal_irq_init() for easier code maintaining. The
patch doesn't introduce logic changes except:

* Rename variable names.
* Release virtual IRQ upon error from request_irq().
* Don't cache the virtual IRQ to opal_irqs[] upon error from
request_irq().

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: Remove "opal" prefix from pr_xxx()s

In commit c8742f85125d "powerpc/powernv: Expose OPAL firmware symbol
map" I added pr_fmt() to opal.c. This left some existing pr_xxx()s with
dupl

powerpc/powernv: Remove "opal" prefix from pr_xxx()s

In commit c8742f85125d "powerpc/powernv: Expose OPAL firmware symbol
map" I added pr_fmt() to opal.c. This left some existing pr_xxx()s with
duplicate "opal" prefixes, eg:

opal: opal: Found 0 interrupts reserved for OPAL

Fix them all up. Also make the "Not not found" message a bit more
verbose.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: Skip registering log region when CONFIG_PRINTK=n

When CONFIG_PRINTK=n, log_buf_addr_get() returns NULL and log_buf_len_get()
return 0. Check for these return values and skip registe

powerpc/powernv: Skip registering log region when CONFIG_PRINTK=n

When CONFIG_PRINTK=n, log_buf_addr_get() returns NULL and log_buf_len_get()
return 0. Check for these return values and skip registering the dump buffer.

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Reviewed-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: Expose OPAL firmware symbol map

Newer versions of OPAL will provide this, so let's expose it to user
space so tools like perf can use it to properly decode samples in
firmware space

powerpc/powernv: Expose OPAL firmware symbol map

Newer versions of OPAL will provide this, so let's expose it to user
space so tools like perf can use it to properly decode samples in
firmware space.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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i2c: Driver to expose PowerNV platform i2c busses

The patch exposes the available i2c busses on the PowerNV platform
to the kernel and implements the bus driver to support i2c and
smbus commands.
Th

i2c: Driver to expose PowerNV platform i2c busses

The patch exposes the available i2c busses on the PowerNV platform
to the kernel and implements the bus driver to support i2c and
smbus commands.
The driver uses the platform device infrastructure to probe the busses
on the platform and registers them with the i2c driver framework.

Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Wolfram Sang <wsa@the-dreams.de> (I2C part, excluding the bindings)
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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powerpc/powernv: Cleanup unused MCE definitions/declarations.

Cleanup OpalMCE_* definitions/declarations and other related code which
is not used anymore.

Signed-off-by: Mahesh Salgaonkar <mahesh@l

powerpc/powernv: Cleanup unused MCE definitions/declarations.

Cleanup OpalMCE_* definitions/declarations and other related code which
is not used anymore.

Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Acked-by: Benjamin Herrrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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