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path: root/drivers/fsi
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2018-07-26fsi: master-ast-cf: Fix memory leakGustavo A. R. Silva
In case memory resources for *fw* were allocated, release them before return. Addresses-Coverity-ID: 1472044 ("Resource leak") Fixes: 6a794a27daca ("fsi: master-ast-cf: Add new FSI master using Aspeed ColdFire") Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-25fsi: master-ast-cf: Mask unused bits in RTAG/RCRCBenjamin Herrenschmidt
Then reading the RTAG/RCRC "registers" from the coprocessor after a command is complete, mask out the top bits, only keep the relevant bits. Microcode v5 will leave garbage in those top bits as a result of a performance optimization. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> ---
2018-07-24fsi: master-ast-cf: Fix build warnings on 64-bit platformsBenjamin Herrenschmidt
A couple of places forgot the 'z' qualifier for dev_dbg when printing a size_t Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-23fsi: Add support for device-tree provided chip IDsBenjamin Herrenschmidt
They get retrieved from the device-tree and exposed as an attribute in sysfs Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-23fsi: sbefifo: Fix inconsistent use of ffdc mutexBenjamin Herrenschmidt
Some of the exit path missed the unlock. Move the mutex to an outer function to avoid the problem completely Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-23fsi: master-ast-cf: Add new FSI master using Aspeed ColdFireBenjamin Herrenschmidt
The Aspeed AST2x00 can contain a ColdFire v1 coprocessor which is currently unused on OpenPower systems. This adds an alternative to the fsi-master-gpio driver that uses that coprocessor instead of bit banging from the ARM core itself. The end result is about 4 times faster. The firmware for the coprocessor and its source code can be found at https://github.com/ozbenh/cf-fsi and is system specific. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-12fsi: Move various master definitions to a common headerBenjamin Herrenschmidt
This moves the definitions for various protocol details (message & response codes, delays etc...) out of fsi-master-gpio.c to fsi-master.h in order to share them with other master implementations. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au>
2018-07-12fsi: master-gpio: Add missing release functionBenjamin Herrenschmidt
The embedded struct device needs a release function to be able to successfully remove the driver. We remove the devm_gpiod_put() as they are unnecessary (the resources will be released automatically) and because fsi_master_unregister() will cause the master structure to be freed. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au>
2018-07-12fsi: Don't use device_unregister() in fsi_master_register()Benjamin Herrenschmidt
In the error path of fsi_master_register(), we currently use device_unregister(). This will cause the last reference to the structure to be dropped, thus freeing the enclosing structure, which isn't what the callers want. Use device_del() instead so that we return to the caller with a refcount of 1. The caller can then assume that it must use put_device() after a call to fsi_master_register() regardless of whether the latter suceeded or failed. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-12fsi: master-gpio: Remove "GPIO" prefix on some definitionsBenjamin Herrenschmidt
Some definitions are generic to the FSI protocol or any give master implementation. Rename them to remove the "GPIO" prefix in preparation for moving them to a common header. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au> # Conflicts: # drivers/fsi/fsi-master-gpio.c
2018-07-12fsi: master-gpio: Remove unused definitionsBenjamin Herrenschmidt
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au>
2018-07-12fsi: master-gpio: Add more tracepointsBenjamin Herrenschmidt
This adds a few more tracepoints that have proven useful when debugging issues with the FSI bus. This also makes echo_delay() use clock_zeros() instead of open-code it in order to share the tracepoint. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au>
2018-07-12fsi: master-gpio: Add support for link_configBenjamin Herrenschmidt
To configure the send and echo delays Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au>
2018-07-12fsi: master-gpio: Rename and adjust send delayBenjamin Herrenschmidt
What the driver called "FSI_GPIO_PRIME_SLAVE_CLOCKS" is what the FSI spec calls tSendDelay and should be 16 clocks by default. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au>
2018-07-12fsi: Add mechanism to set the tSendDelay and tEchoDelay valuesBenjamin Herrenschmidt
Those values control the amount of "dummy" clocks between commands and between a command and its response. This adds a way to configure them from sysfs (to be later extended to defaults in the device-tree). The default remains 16 (the HW default). This is only supported if the backend supports the new link_config() callback to configure the generation of those delays. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au> ---
2018-07-12fsi: Move code around to avoid forward declarationBenjamin Herrenschmidt
Move fsi_slave_set_smode() and its helpers to before it's first user and remove the corresponding forward declaration. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au>
2018-07-12fsi: sbefifo: Fix checker warning about late NULL checkBenjamin Herrenschmidt
"dev" is dereferences before it's checked. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-12fsi/sbefifo: Add dependency on OF_ADDRESSGuenter Roeck
The driver calls of_platform_device_create() which is only available if OF_ADDRESS is enabled. When building sparc64 images, this results in ERROR: "of_platform_device_create" [drivers/fsi/fsi-sbefifo.ko] undefined! Fixes: 9f4a8a2d7f9d ("fsi/sbefifo: Add driver for the SBE FIFO") Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-12fsi: sbefifo: Add missing mutex_unlockEddie James
There was no unlock of the FFDC mutex. Fixes: 9f4a8a2d7f9d ("fsi/sbefifo: Add driver for the SBE FIFO") Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-06-18fsi: scom: Major overhaulBenjamin Herrenschmidt
This was too hard to split ... this adds a number of features to the SCOM user interface: - Support for indirect SCOMs - read()/write() interface now handle errors and retries - New ioctl() "raw" interface for use by debuggers Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Eddie James <eajames@linux.vnet.ibm.com> Reviewed-by: Alistair Popple <alistair@popple.id.au>
2018-06-18fsi: scom: Add register definitionsBenjamin Herrenschmidt
Add a few more register and bit definitions, also define and use SCOM_READ_CMD (which is 0 but it makes the code clearer) Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Eddie James <eajames@linux.vnet.ibm.com>
2018-06-18fsi: scom: Fixup endian annotationsBenjamin Herrenschmidt
Use the proper annotated type __be32 and fixup the accessor used for get_scom() Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Eddie James <eajames@linux.vnet.ibm.com>
2018-06-18fsi: scom: Whitespace fixesBenjamin Herrenschmidt
No functional changes Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Eddie James <eajames@linux.vnet.ibm.com>
2018-06-18fsi: scom: Add mutex around FSI2PIB accessesBenjamin Herrenschmidt
Otherwise, multiple clients can open the driver and attempt to access the PIB at the same time, thus clobbering each other in the process. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Eddie James <eajames@linux.vnet.ibm.com>
2018-06-18fsi: core: Fix sparse warningsJoel Stanley
fsi-core.c:210:9: warning: cast to restricted __be32 fsi-core.c:210:9: warning: cast to restricted __be32 fsi-core.c:210:9: warning: cast to restricted __be32 fsi-core.c:210:9: warning: cast to restricted __be32 fsi-core.c:210:9: warning: cast to restricted __be32 fsi-core.c:210:9: warning: cast to restricted __be32 fsi-core.c:210:9: warning: cast to restricted __be32 fsi-core.c:210:9: warning: cast to restricted __be32 fsi-core.c:210:9: warning: cast to restricted __be32 fsi-core.c:210:9: warning: cast to restricted __be32 fsi-core.c:210:9: warning: cast to restricted __be32 fsi-core.c:210:9: warning: cast to restricted __be32 fsi-core.c:606:15: warning: incorrect type in assignment (different base types) fsi-core.c:606:15: expected unsigned int [unsigned] [assigned] [usertype] smode fsi-core.c:606:15: got restricted __be32 [usertype] <noident> fsi-core.c:492:28: warning: expression using sizeof(void) fsi-core.c:520:29: warning: expression using sizeof(void) fsi-core.c:682:19: warning: cast to restricted __be32 fsi-core.c:682:19: warning: cast to restricted __be32 fsi-core.c:682:19: warning: cast to restricted __be32 fsi-core.c:682:19: warning: cast to restricted __be32 fsi-core.c:682:19: warning: cast to restricted __be32 fsi-core.c:682:19: warning: cast to restricted __be32 fsi-core.c:706:24: warning: incorrect type in assignment (different base types) fsi-core.c:706:24: expected unsigned int [unsigned] [usertype] llmode fsi-core.c:706:24: got restricted __be32 [usertype] <noident> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-06-18fsi: master-hub: Fix sparse warningsJoel Stanley
fsi-master-hub.c:128:13: warning: incorrect type in assignment (different base types) fsi-master-hub.c:128:13: expected unsigned int [unsigned] [usertype] cmd fsi-master-hub.c:128:13: got restricted __be32 [usertype] <noident> fsi-master-hub.c:208:13: warning: incorrect type in assignment (different base types) fsi-master-hub.c:208:13: expected restricted __be32 [addressable] [assigned] [usertype] reg fsi-master-hub.c:208:13: got int Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-06-18fsi: sbefifo: Fix sparse warningsJoel Stanley
fsi-sbefifo.c:547:58: warning: incorrect type in argument 2 (different base types) fsi-sbefifo.c:547:58: expected restricted __be32 [usertype] *word fsi-sbefifo.c:547:58: got unsigned int *<noident> fsi-sbefifo.c:635:16: warning: incorrect type in assignment (different base types) fsi-sbefifo.c:635:16: expected unsigned int [unsigned] <noident> fsi-sbefifo.c:635:16: got restricted __be32 [usertype] <noident> fsi-sbefifo.c:636:16: warning: incorrect type in assignment (different base types) fsi-sbefifo.c:636:16: expected unsigned int [unsigned] <noident> fsi-sbefifo.c:636:16: got restricted __be32 [usertype] <noident> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-06-14fsi: sbefifo: Remove unneeded semicolonBenjamin Herrenschmidt
Spotted by kbuild-test-bot Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-06-12fsi/sbefifo: Add driver for the SBE FIFOBenjamin Herrenschmidt
This driver provides an in-kernel and a user API for accessing the command FIFO of the SBE (Self Boot Engine) of the POWER9 processor, via the FSI bus. It provides an in-kernel interface to submit command and receive responses, along with a helper to locate and analyse the response status block. It's a simple synchronous submit() type API. The user interface uses the write/read interface that an earlier version of this driver already provided, however it has some specific limitations in order to keep the driver simple and avoid using up a lot of kernel memory: - The user should perform a single write() with the command and a single read() to get the response (with a buffer big enough to hold the entire response). - On a write() the command is simply "stored" into a kernel buffer, it is submitted as one operation on the subsequent read(). This allows to have the code write directly from the FIFO into the user buffer and avoid hogging the SBE between the write() and read() syscall as it's critical that the SBE be freed asap to respond to the host. An extra write() will simply replace the previously written command. - A write of a single 4 bytes containing the value 0x52534554 in big endian will trigger a reset request. No read is necessary, the write() call will return when the reset has been acknowledged or times out. - The command is limited to 4K bytes. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Tested-by: Joel Stanley <joel@jms.id.au> ---
2018-06-12fsi: scom: Remove PIB reset during probeEddie James
The PIB reset causes problems for the running P9 chip. The reset shouldn't be performed by this driver. Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com> Reviewed-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Tested-by: Joel Stanley <joel@jms.id.au>
2018-06-12fsi/master-gpio: Replace bit_bit lock with IRQ disable/enableJeremy Kerr
We currently use a spinlock (bit_lock) around operations that clock bits out of the FSI bus, and a mutex to protect against simultaneous access to the master. This means that bit_lock isn't needed for mutual exlusion, only to prevent timing issues when clocking bits out. To reflect this, this change converts bit_lock to just the local_irq_save/restore operation. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Tested-by: Joel Stanley <joel@jms.id.au>
2018-06-12fsi/fsi-master-gpio: More error handling cleanupBenjamin Herrenschmidt
Remove calls to the empty and useless fsi_master_gpio_error() function, and report CRC errors as "FSI_ERR_NO_SLAVE" when reading an all 1's response. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Tested-by: Joel Stanley <joel@jms.id.au>
2018-06-12fsi/fsi-master-gpio: Implement CRC error recoveryBenjamin Herrenschmidt
The FSI protocol defines two modes of recovery from CRC errors, this implements both: - If the device returns an ECRC (it detected a CRC error in the command), then we simply issue the command again. - If the master detects a CRC error in the response, we send an E_POLL command which requests a resend of the response without actually re-executing the command (which could otherwise have unwanted side effects such as dequeuing a FIFO twice). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Tested-by: Joel Stanley <joel@jms.id.au> --- Note: This was actually tested by removing some of my fixes, thus causing us to hit occasional CRC errors during high LPC activity.
2018-06-12fsi/gpio: Use relative-addressing commandsJeremy Kerr
FSI CFAMs support shorter commands that use a relative (or same) address as the last. This change introduces a last_addr to the master state, and uses it for subsequent reads/writes, and performs relative addressing when a subsequent read/write is in range. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Tested-by: Joel Stanley <joel@jms.id.au>
2018-06-12fsi/gpio: Include command build in locked sectionJeremy Kerr
For implementing relative addressing mode, we'll need to build a command that is coherent with CFAM state. To do that, include the build_command_* functions in the locked section of read/write/term. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Tested-by: Joel Stanley <joel@jms.id.au>
2018-06-12fsi/fsi-master-gpio: Delay sampling of FSI data inputBenjamin Herrenschmidt
Most SoC GPIO implementations, including the Aspeed one, have synchronizers on the GPIO inputs. This means that the value read from a GPIO is a couple of clocks old, from whatever clock source feeds those synchronizers. In practice, this means that in no-delay mode, we are using a value that can potentially be a bit too old and too close to the clock edge establishing the data on the other side of the link. The voltage converters we use on some systems make this worse and sensitive to things like voltage fluctuations etc... This is, we believe, the cause of occasional CRC errors encountered during heavy activity on the LPC bus. This is fixed by introducing a dummy GPIO read before the actual data read. It slows down SBEFIFO by about 15% (less than any delay primitive) and the end result is so far solid. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Tested-by: Joel Stanley <joel@jms.id.au>
2018-06-12fsi/fsi-master-gpio: Reduce dpoll clocksBenjamin Herrenschmidt
FSI_GPIO_DPOLL_CLOCKS is the number of clocks before sending a DPOLL command after receiving a BUSY status. It should be at least tSendDelay (16 clocks). According to comments in the code, it needs to also be at least 21 clocks due to HW issues. It's currently 100 clocks which impacts performances negatively in some cases. Reduces it in half to 50 clocks which seems to still be solid. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Tested-by: Joel Stanley <joel@jms.id.au>
2018-06-12fsi/fsi-master-gpio: Reduce turnaround clocksBenjamin Herrenschmidt
FSI_GPIO_PRIME_SLAVE_CLOCKS is the number of clocks if the "idle" phase between the end of a response and the beginning of the next one. It corresponds to tSendDelay in the FSI specification. The default value in the slave is 16 clocks. 100 is way overkill and significantly reduces the driver performance. This changes it to 20 (which gives the HW a bit of margin still just in case). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Tested-by: Joel Stanley <joel@jms.id.au>
2018-06-12fsi/fsi-master-gpio: Add "no-gpio-delays" optionBenjamin Herrenschmidt
This adds support for an optional device-tree property that makes the driver skip all the delays around clocking the GPIOs and set it in the device-tree of common POWER9 based OpenPower platforms. This useful on chips like the AST2500 where the GPIO block is running at a fairly low clock frequency (25Mhz typically). In this case, the delays are unnecessary and due to the low precision of the timers, actually quite harmful in terms of performance. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Tested-by: Joel Stanley <joel@jms.id.au>
2018-06-12fsi/fsi-master-gpio: Sample input data on different clock phaseBenjamin Herrenschmidt
We currently sample the input data right after we toggle the clock low, then high. The slave establishes the data on the rising edge, so this is not ideal. We should sample it on the low phase instead. This currently works because we have an extra delay, but subsequent patches will remove it. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Tested-by: Joel Stanley <joel@jms.id.au>
2018-06-12fsi: gpio: Use a mutex to protect transfersJeremy Kerr
Reduce time spent with interrupts disabled by limiting the critical sections to bitbanging FSI symbols. We only need to ensure exclusive use of the bus for an entire transfer, not that the transfer be performed in atomic context. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Tested-by: Joel Stanley <joel@jms.id.au>
2018-06-12fsi: gpio: Remove unused 'id' variableAndrew Jeffery
Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Tested-by: Joel Stanley <joel@jms.id.au>
2018-06-12fsi: gpio: Trace busy countAndrew Jeffery
An observation from trace output of the existing FSI tracepoints was that the remote device was sometimes reporting as busy. Add a new tracepoint reporting the busy count in order to get a better grip on how often this is the case. Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Acked-by: Eddie James <eajames@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Tested-by: Joel Stanley <joel@jms.id.au>
2018-03-14fsi: core: Add check for master property no-scan-on-initChristopher Bostic
Prior to scanning a master check if the optional property no-scan-on-init is present. If it is then avoid scanning. This is necessary in cases where a master scan could interfere with another FSI master on the same bus. Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Acked-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-14fsi: master: Clarify master lifetimes & fix use-after-free in hub masterJeremy Kerr
Once we call fsi_master_unregister, the core will put_device, potentially freeing the hub master. This change adds a comment explaining the lifetime of an allocated fsi_master. We then add a reference from the driver to the hub master, so it stays around until we've finished ->remove(). Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Tested-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-14fsi: core: Reduce console output during normal scanChristopher Bostic
To reduce amount of console output during boot / power up make all normal path scan related messages debug type. Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Acked-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-14fsi: Match fsi slaves and engines to available dt nodesJeremy Kerr
This change populates device tree nodes for scanned FSI slaves and engines. If the master populates ->of_node of the FSI master device, we'll look for matching slaves, and under those slaves we'll look for matching engines. This means that FSI drivers will have their ->of_node pointer populated if there's a corresponding DT node, which they can use for further device discover. Presence of device tree nodes is optional, and only required for fsi device drivers that need extra properties, or subordinate devices, to be enumerated. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-14fsi: Fix one and two byte bus reads/writesEddie James
Address checker fixed to allow one and two byte reads/writes. Address alignments for each size verified. Signed-off-by: Edward James <eajames@us.ibm.com> Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Acked-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-14fsi: master-gpio: Add external modeJeremy Kerr
This change introduces an 'external mode' for GPIO-based FSI masters, allowing the clock and data lines to be driven by an external source. For example, external mode is selected by a user when an external debug device is attached to the FSI pins. To do this, we need to set specific states for the trans, mux and enable GPIOs, and prevent access to clk & data from the FSI core code (by returning EBUSY). External mode is controlled by a sysfs attribute, so add the relevant information to Documentation/ABI/ Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Reviewed-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-14fsi: master-gpio: Add locking during break and link enableJeremy Kerr
Currently, we perform GPIO accesses in fsi_master_gpio_break and fsi_master_link_enable, without holding cmd_lock. This change adds the appropriate locking. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Reviewed-by: Joel Stanley <joel@jms.id.au> Reviewed-by: Christopher Bostic <clbostic@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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